CONNECTING STRUCTURE
A connecting structure a one rod-shaped member and a counterpart rod-shaped member includes a hollow connecting pipe disposed to straddle contact surfaces with the one member and the counterpart member, and a fixing unit including a bolt with which the connecting pipe is integrated with the one member and the counterpart member. The one member and the counterpart member include upright grooves configured to house the connecting pipe entirely. The upright grooves face each other to dispose the contact surfaces therebetween and extend vertically. The connecting pipe has a side surface provided with a lateral hole configured such that the fixing unit including the bolt is inserted thereinto. The upright grooves extend toward without reaching a lower surface of the one member and a lower surface of the counterpart member. The upright grooves have respective bottoms serving as upward surfaces configured such that the connecting pipe is placed thereon.
This application is a U.S. National stage application of International Application No. PCT/JP2014/079293, filed Nov. 5, 2014, which claims priority to Japanese Patent Application No. 2013-230572 filed in Japan on Nov. 6, 2013 and Japanese Patent Application No. 2014-012698 filed in Japan on Jan. 27, 2014. The entire contents of Japanese Patent Application Nos. 2013-230572 and 2014-012698 are incorporated by reference herein.
BACKGROUND1. Filed of the Invention
This invention relates to a connecting structure between rod-shaped members such as a pillar and a horizontal member employed in various wooden structures including wooden buildings.
2. Background Information
Many wooden structures including wooden buildings have a framework formed by combining rod-shaped members such as a pillar and a horizontal member. A place where these members are connected is extremely important in terms of maintaining the strength of a construction. A fitting technique such as forming a connection or joint has been introduced for a long time. However, forming a connection or joint causes a problem in that these members require complicated processes. Thus, various metal fittings have been employed in recent years for a connection between members in many cases.
Various techniques have been suggested relating to a connection between members. Examples of these techniques are described below. Japanese Patent Application Publication No. Sho 52-56714 discloses a framework method using a connecting metal fitting as an alternative to forming a connection or joint. In this method, a hole is formed in a piece of wood, a bolt is embedded in the hole, and the bolt is fixed to the piece of wood with a caulking material. A hollow connecting metal fitting is used for insertion of the bolt protruding from the piece of wood. The protruding bolt is inserted into the connecting metal fitting and a nut is threadedly engaged with the tip of the bolt and fastened. In this way, a plurality of pieces of wood can be connected via the connecting metal fitting.
Japanese Patent Application Publication No. 2005-188722 discloses a drift pin used in a joint place between a pillar and a beam employed for example in a wooden framework structure. This drift pin has a dual structure including a tubular body and an engagement member like a thin rod inserted in the body. As a result of this structure, reaction force is generated in a direction where the drift pin expands, making it possible to prevent the drift pin from loosening due to aging degradation of members after construction. As illustrated in
What is important for wooden buildings is to create a natural atmosphere resulting from trees to offer healing space for people. Thus, even if various metal fittings are used for a connection between members, considerations are given at a design stage or a construction stage in many cases so as to make the metal fittings completely invisible from indoor space. Further, the metal fittings bring about problems in that they become a cause for dew condensation as a result of a large difference in heat conductivity from wood, and that they are easy to brittle by heat occurring in case of fire. These problems may be overcome by embedding the metal fittings in the inside of wood for minimizing exposure of the metal fittings to the outside. In order to implement this means, however, considerations should be given to various factors such as construction performance, strength, and cost.
The aforementioned connecting metal fitting disclosed in Japanese Patent Application Publication No. Sho 52-56714 is caught in a boundary between two members, so that the existence thereof can easily be recognized visually from outside. The connecting metal fitting disclosed in Japanese Patent Application Publication No. 2005-188722 is embedded in the hole and the recess formed in the members. Thus, a side surface of this metal fitting is hidden completely. However, the upper surface and the lower surface of this metal fitting are exposed to the outside. Additionally, the opposite ends of the drift pin are also exposed to the outside. As described above, most of metal fittings currently used are exposed to the outside at least partially.
This invention has been developed based on the aforementioned actual circumstances. It is an object of this invention to provide a connecting structure between members employed in various wooden structures including wooden buildings where a metal fitting can be embedded in the members substantially entirely to achieve excellence in an aesthetic aspect, for example.
To solve the aforementioned problem, the invention recited in claim 1 is intended for a connecting structure between a one rod-shaped member and a counterpart rod-shaped member. The connecting structure uses: a hollow connecting pipe disposed to straddle contact surfaces with the one member and the counterpart member; and a fixing means including a bolt with which the connecting pipe is integrated with the one member and the counterpart member. The one member and the counterpart member include upright grooves configured to house the connecting pipe entirely. The upright grooves face each other to dispose the contact surfaces therebetween and extend vertically. The connecting pipe has a side surface provided with a lateral hole configured such that the fixing means including the bolt is inserted thereinto. The upright grooves extend toward without reaching a lower surface of the one member and a lower surface of the counterpart member. The upright grooves have respective bottoms serving as upward surfaces configured such that the connecting pipe is placed thereon.
This invention is to connect rod-shaped members in various wooden structures including wooden buildings. For the sake of convenience, a member closer to a foundation out of a plurality of members to be connected is referred to as a one member and a member to be supported in a suspended manner in the air by the one member is referred to as a counterpart member. A connected part between the one member and the counterpart member is required to form direct surface contact between these members. The members can be disposed freely. An L-shaped connected part or a T-shaped connected part may be formed by making a side surface of the one member and an end surface of the counterpart member contact each other. Alternatively, the members may be connected in a linear pattern by making respective end surfaces of the members contact each other. Still alternatively, a cross-shaped connected part may be formed by making end surfaces of the counterpart members contact opposite side surfaces of the one member.
The connecting pipe is responsible for a connection between the one member and the counterpart member. The connecting pipe is formed by cutting a square steel pipe into a predetermined length, for example, and is used in an upright position. In this invention, a bolt and a nut should be placed and fastened in the connecting pipe, which requires a certain degree of space in the connecting pipe. The language “disposed to straddle the contact surfaces with the one member and the counterpart member” means that the connecting pipe crosses over the contact surfaces of the one member and the counterpart member to go into both of the members.
The upright grooves are grooves formed in both of the one member and the counterpart member for housing of the connecting pipe. The upright grooves are required to extend in a linear pattern. Further, the upright grooves are responsible for hiding an entire side surface of the connecting pipe housed in the upright grooves. Thus, the depths of the upright grooves (distances from the corresponding contact surfaces) are ensured in such a manner that the connecting pipe can be housed in the upright grooves while the one member and the counterpart member contact each other to make the respective upright grooves face each other. However, the depths of the upright grooves in the one member and the counterpart member may differ from each other.
The fixing means is used for fixing the connecting pipe to the one member and the counterpart member. The fixing means is formed of a lag screw to be embedded in the back surface of the upright groove, and a bolt or a nut to be threadedly engaged with the lag screw, for example. The fixing means to be used for forming a cross-shaped connected part where side surfaces of the one member are caught between the two counterpart members may include a stud bolt to penetrate opposite side surfaces of the one member and nuts to be threadedly engaged with opposite ends of the stud bolt. The lateral hole is provided in a side surface of the connecting pipe for insertion of this bolt, etc. The lateral hole is formed in a surface facing the back surface of the upright groove.
The upright grooves extend vertically. Both of the upright grooves belonging to the one member and the counterpart member extend toward the lower surfaces of these members but do not reach the lower surfaces of these members. This makes the connecting pipe completely invisible from below. The bottoms of the upright grooves are referred to as upward surfaces. By placing the connecting pipe on the upward surfaces, a vertical load can be transmitted between the connecting pipe and the members. In order to reduce pressure to act on the upward surfaces, the lower surface of the connecting pipe may be covered. Additionally, in terms of ensuring the rigidity of the connected part, the upright grooves and the connecting pipe preferably have the same breadth.
As described above, by fitting the connecting pipe in the upright grooves and integrating the connecting pipe with the one member and the counterpart member using the fixing means, the members can be connected via the connecting pipe. The upright grooves do not reach the lower surfaces of the members. This makes a metallic component completely invisible from a lateral side of the connected part or from below the connected part to create a natural atmosphere resulting from trees. The upper parts of the upright grooves cannot be hidden. However, a floor plate is placed on unhidden surfaces of these upper parts. Thus, the upright grooves are eventually hidden entirely.
The connecting pipe has excellent rigidity against torsion or bending as a result of its shape. This necessarily enhances the rigidity of a connected part between the one member and the counterpart member. This effect is exerted most notably by fitting the connecting pipe in the upright grooves tightly. Additionally, the postures of the one member and the counterpart member after construction can be determined freely. In some place of construction, the upright grooves may not extend in a vertical direction.
Another aspect of this invention is intended for a specific example of the fixing means. This aspect is characterized in that the fixing means is formed of an embedded shaft to be embedded in pilot holes formed in the back surfaces of the upright grooves and a bolt to be inserted into the lateral hole. A female screw is provided at an end surface of the embedded shaft to be threadedly engaged with the bolt.
The embedded shaft is a rod-shaped metallic shaft such as a lag screw or deformed bar steel to be embedded in a member. The embedded shaft is inserted into the pilot hole formed in the back surface of the upright groove. The back surface of the upright groove is a surface located at the back of the upright groove and extending substantially parallel to the corresponding contact surface. The deformed bar steel is integrated with the member via an adhesive. A female screw is provided at an end surface of the embedded shaft (end surface exposed to the outside) to be threadedly engaged with the bolt.
During construction, the upright grooves and the pilot holes are formed first and the embedded shafts are embedded and fixed in the pilot holes. Next, the connecting pipe is fitted in the upright groove in the counterpart member and the bolt is placed inside the connecting pipe thereafter. The tip of the bolt is inserted into the lateral hole, threadedly engaged with the female screw, and fastened. As described above, the female screw is provided at the end surface of the embedded shaft and the bolt is threadedly engaged with the female screw. As a result, the embedded shaft can be embedded entirely in the pilot hole. This reduces restrictions to form a contact between the one member and the counterpart member during construction. Thus, the one member and the counterpart member can be placed in their regular positions only by installing the one member and then moving down the counterpart member in a raised position gradually.
Another aspect of this invention is intended to limit the shape of the upright grooves. This aspect is characterized in that the upright grooves are formed such that a surface of the one member or a surface of the counterpart member is hollowed out, and downward surfaces facing the upper surface of the connecting pipe are provided at upper parts of this upright grooves. As described above, the upright groove extends vertically and the top part of the upright groove reaches the upper surface of a member in many cases in consideration of performance during processing or construction. However, as in this invention, the upright groove can extend toward without reaching the upper surface of the member to form the downward surface.
The downward surface necessarily faces the upward surface. The connecting pipe is caught between the downward surface and the upward surface. The downward surface and the upper surface of the connecting pipe can contact each other. In consideration of workability, etc., however, a certain degree of space may be formed between the downward surface and the upper surface of the connecting pipe. The upper part of the upright groove offers a working space for incorporation of the fixing means such as a bolt. Thus, the upper parts of the upright grooves extending over the one member and the counterpart member cannot be covered entirely. The range of the downward surface is limited to a part of each upright groove. A particular method of forming the downward surface can be determined freely.
For example, the downward surface may be formed by a method of cutting a member into the upright groove in such a manner that a surface of the member is hollowed out and defining one inner surface of the upright groove as the downward surface. The downward surface may also be formed at the back of the upright groove by cutting the member into different depths at an upper part of the upright groove in such a manner that the upright groove reaches the upper surface of the member in a place near a surface of the member and that the upright groove does not reach the upper surface of the member in a place behind the place near the surface. The downward surface is not always provided to any one of the one member and the counterpart member but it can also be provided to both of these members. By making the upper surface of the connecting pipe contact the downward surface, a vertical load to act between the one member and the counterpart member can be transmitted partially through a surface of this contact. This can reduce a burden on a bolt, etc. to act more advantageously in terms of strength and reliability.
According to this invention, the one member and the counterpart member can be connected via the connecting pipe by fitting the connecting pipe in the upright grooves and integrating the connecting pipe with the members using the fixing means. The upright grooves extend toward without reaching the lower surfaces of the members. Further, the fixing means is entirely embedded in the members or the connecting pipe. This makes a metallic component completely invisible from a lateral side of the connected part or from below the connected part to create a natural atmosphere resulting from trees.
Further, the connecting pipe and the fixing means are entirely embedded in the members and can be isolated from external air completely by covering the upper parts of the upright grooves for example with a floor plate. This can prevent dew condensation from being caused by a difference in heat conductivity, and reduce temperature increase in case of fire, thereby enhancing the reliability of the connected part. The connecting pipe is placed on the upward surfaces at the bottoms of the upright grooves. Thus, a vertical load can be transmitted via these places to reduce a burden on the fixing means, contributing to increase in the strength of the connected part.
According to the aspect of this invention, by forming the fixing means using the embedded shaft with a female screw provided at its end surface and the bolt to be threadedly engaged with the female screw, the embedded shaft can be embedded entirely in the members. This reduces restrictions to form a contact between the one member and the counterpart member during construction. In a specific example, the one member and the counterpart member can be placed in their regular positions only by installing the one member, attaching the connecting pipe to the counterpart member, and then moving down the counterpart member in a raised position gradually without requiring work of drawing the one member and the counterpart member toward each other and making the members contact each other tightly.
According to the aspect of this invention, by providing the downward surface at the upper part of the upright groove, an upper part of the connecting pipe can also be hidden by the corresponding member. This acts more advantageously in terms of an aesthetic aspect and fire resistance. By making the upper surface of the connecting pipe and the downward surface contact each other, a vertical load is transmitted between this upper surface and the downward surface to reduce a load on a bolt, etc. This acts more advantageously in terms of strength and reliability.
The connecting pipe 11 is a cutout from a general-purpose steel pipe and is smaller in breadth than the counterpart member 51. An upright groove 44 and an upright groove 54 are formed in the one member 41 and the counterpart member 51 respectively for housing of the connecting pipe 11. The upright grooves 44 and 54 start from the contact surfaces 43 and 53 respectively and are cut into rectangular shapes to reach given depths. Upper parts of the upright grooves 44 and 54 are opened to the outside, whereas lower parts thereof extend toward without reaching the lower surfaces of the one member 41 and the counterpart member 51 respectively. Thus, an upward surface 45 and an upward surface 55 extending in a horizontal direction are formed at the bottoms of the upright grooves 44 and 54 respectively.
The upright grooves 44 and 54 have heights (in a vertical direction) that allow the connecting pipe 11 in an upright position to be housed entirely in the upright grooves 44 and 54. The depths (dimensions with respect to the contact surfaces 43 and 53) and the widths of the upright grooves 44 and 54 are adjusted so as to allow the connecting pipe 11 to be housed tightly in the upright grooves 44 and 54 when the one member 41 and the counterpart member 51 contact each other.
The fixing means is to integrate the connecting pipe 11 with the one member 41 and the counterpart member 51. The fixing means is formed of an embedded shaft 21 using a lag screw and a bolt 31 to be threadedly engaged with the embedded shaft 21. The embedded shaft 21 has a columnar shape with a lateral circumferential surface provided with a thread 26 extending in a spiral pattern. The embedded shaft 21 has a head 25 for hang of a tool and a female screw 27 for threaded engagement of the bolt 31 that are formed at one end surface of the embedded shaft 21. Referring to
Referring to
After the embedded shafts 21 and the shafts 28 are embedded in the one member 41 and the counterpart member 51, the connecting pipe 11 is fitted in the upright grooves 44 and 54 and the bolts 31 are inserted from the inside of the connecting pipe 11 toward the female screws 27, thereby connecting the one member 41 and the counterpart member 51 via the connecting pipe 11. The connecting pipe 11 has a side surface provided with lateral holes 38 for insertion of the bolts 31. The lateral holes 38 are adjusted in position so as to be aligned concentrically with the embedded shafts 21 and the shafts 28. However, in consideration of construction work, the bolts 31 to be threadedly engaged with the lower embedded shafts 21 are fitted in lateral grooves 37 as an alternative to the lateral holes 38.
After the embedded shafts 21 and the shaft 28 are embedded in the counterpart member 51, the connecting pipe 11 is fitted in the upright groove 54 and the lower part of the connecting pipe 11 is placed on the upward surface 55. As a result, the lateral holes 38 are aligned concentrically with the female screws 27 of the embedded shafts 21 and the female screw 27 of the embedded shaft 28. Next, the bolts 31 are placed in the connecting pipe 11 and the tips of the bolts 31 are inserted into the lateral holes 38 and the lateral groove 37. The bolts 31 are threadedly engaged with the female screws 27 and fastened, thereby integrating the connecting pipe 11 and the counterpart member 51. As shown in
While the connecting pipe 11 and the counterpart member 51 are integrated, the bolt 31 is threadedly engaged with the lower embedded shaft 21 in the one member 41. At this stage, this bolt 31 is not fastened but the head of the bolt 31 is floated on purpose to ensure a gap into which the lateral groove 37 is to be fitted. Then, the counterpart member 51 is raised and the position of the counterpart member 51 is adjusted in such a manner that the connecting pipe 11 comes to a position directly above the upright groove 44 in the one member 41. Next, the counterpart member 51 is moved down gradually to make the connecting pipe 11 start to enter the upright groove 44. When the shaft portion of the bolt 31 enters the inside of the lateral groove 37, separation between the one member 41 and the counterpart member 51 is prohibited. After the connecting pipe 11 contacts the upward surface 45 of the one member 41, all the bolts 31 are fastened to complete formation of a connection between the one member 41 and the counterpart member 51.
The work of integrating the connecting pipe 11 and the counterpart member 51 can be done at a lumbering stage. This can reduce a workload at the work site. The connecting pipe 11 protrudes from the end surface of the counterpart member 51, while no part of the connecting pipe 11 protrudes in the direction of a side surface of the counterpart member 51. Thus, even if the connecting pipe 11 and the counterpart member 51 are integrated at the lumbering stage, the counterpart members 51 can still be stacked like square pieces of wood during storage or transportation. This achieves excellence in terms of cost and safety.
In
Similarly to
To stabilize the head of each bolt 31, a dedicated washer 35 is used. One surface of the washer 35 is curved so as to contact the inner circumferential surface of the connecting pipe 13 tightly. Unlike the connecting pipes described above, the connecting pipe 13 is not allowed to be in surface contact with each of the upright grooves 44 and 54. However, a certain degree of rigidity can still be ensured by adjusting the dimension of each part in such a manner that the connecting pipe 13 is caught in the upright grooves 44 and 54.
A connecting pipe 14 used in this structure is narrowed toward the bottom as viewed from a lateral side, so that the connecting pipe 14 is allowed to contact the back surfaces of the upright grooves 44 and 54 tightly both on the side of the one member 41 and the side of the counterpart member 51. Further, the upper end of the connecting pipe 14 is formed into a sloping surface so as not to protrude upwardly from the upright grooves 44 and 54. Even if the counterpart member 51 slopes upwardly conversely to the structure of
The external groove 47 has such a size that the end portion of the counterpart member 51 is fitted in the external groove 47 tightly. If the one member 41 and the counterpart member 51 are actually fitted to each other, their respective upward surfaces 45 and 55 are aligned without any level difference. Additionally, the two embedded, shafts 21 are embedded in each of the one member 41 and the counterpart member 51. In preparation therefor, the upper and lower lateral holes 38 are formed in the connecting pipe 15.
The lower surface of the connecting pipe 16 is covered with a bottom plate 36 except an area in the vicinity of the lateral groove 37. This increases an area of contact with each of the upward surfaces 45 and 55, contributing to distribution of a load. For a connection between the one member 41 and the counterpart member 51 of
The connecting pipe 17a illustrated in the upper left area is fixed in the upright groove 54 in the left counterpart member 51. The connecting pipe 17b illustrated in the upper right area is fixed in the upright groove 54 in the right counterpart member 51. Fitting both the connecting pipes 17a and 17b in the upright groove 44 in the one member 41 makes respective side surfaces of the two connecting pipes 17a and 17b contact each other tightly. These side surfaces contacting each other tightly are provided with hold-down holes 63 through which the two connecting pipes 17a and 17b can be integrated. The pilot holes 56 in both of the two counterpart members 51 extend in the longitudinal directions of the corresponding members. Further, the back surfaces of the upright grooves 54 are perpendicular to the longitudinal directions of the corresponding members.
The one member 41 is provided with the upright grooves 44 for housing of the connecting pipes 11 and the pilot holes 46 for insertion of the stud bolts 34. The upright grooves 44 are formed on both of the right and left sides. The pilot holes 46 penetrate both of these sides. Additionally, the vertical member 71 is connected to the one member 41 via the mortise pipe 64. In preparation therefor, a center hole 49 for insertion of the mortise pipe 64 is formed in the center of the upper surface of the one member 41. The center hole 49 crosses the pilot holes 46. Inserting the stud bolts 34 into the mortise pipe 64 integrates the mortise pipe 64 and the one member 41. Likewise, a center hole 74 is formed in the center of the lower surface of the vertical member 71. After the mortise pipe 64 is inserted into the center hole 74, the mortise pipe 64 and the vertical member 71 are integrated with fixing pins 66. For insertion of the fixing pins 66, pin holes 72 are formed in side surfaces of the vertical member 71. Further, for insertion of the stud bolts 34 and the fixing pins 66, round holes 65 are formed in the lateral circumferential surface of the mortise pipe 64.
The one member 41 and the vertical member 71 are connected via a stud bolt 77. The center hole 49 for screwing-in of a lower lag screw 76 is formed in the center of the upper surface of the one member 41. A female screw is formed at an upper end surface of the lower lag screw 76. A lower part of the stud bolt 77 can be threadedly engaged with this female screw. Further, the center hole 74 is formed in the center of the lower surface of the vertical member 71. Additionally, a rectangular side window 73 continuous with the center hole 74 is formed in a side surface of the vertical member 71.
An upper lag screw 78 is screwed into the center hole 74 in the vertical member 71. The upper lag screw 78, which has a hollow shape, allows the stud bolt 77 protruding from the one member 41 to pass through. By placing the vertical member 71 directly above the one member 41, the upper end of the stud bolt 77 goes through the upper lag screw 78 to reach the inside of the side window 73. Then, a nut 79 and a washer 75 are inserted via the side window 73, and the nut 79 is threadedly engaged with the stud bolt 77 and fastened. As a result, the vertical member 71 is drawn toward the one member 41 to complete formation of every connection.
Similarly to
The upper jaw 80 is formed by adjusting a range of cutting for formation of the upright groove 54. The lower surface of the upper jaw 80 is defined as the downward surface 52. The downward surface 52 faces the upward surface 55. The dimension of the downward surface 52 is adjusted so as to allow a connecting pipe 10 to be caught between the downward surface 52 and the upward surface 55. A general-purpose steel pipe is used as the connecting pipe 10. The connecting pipe 10 is provided with the lateral holes 38 and the lateral grooves 37 formed in side surfaces of the connecting pipe 10. The upper surface of the connecting pipe 10 is partially covered with a top plate 67. The top plate 67 is to contact the downward surface 52 of the counterpart member 51 and has a size that does not interfere with fastening of the bolt 31, for example.
After the embedded shafts 21 and the shaft 28 are embedded in the counterpart member 51, the connecting pipe 10 is fitted in the upright groove 54. This makes the lower surface of the connecting pipe 10 contact the upward surface 55, while making the upper surface of the connecting pipe 10 (including the top plate 67) contact the downward surface 52. Next, the bolts 31 are placed in the connecting pipe 10, and the tips of the bolts 31 are inserted into the lateral holes 38 and the lateral groove 37. The bolts 31 are threadedly engaged with the female screws 27 and fastened, thereby integrating the connecting pipe 10 and the counterpart member 51. Considerations are given to the shape and the size of the upper jaw 80 of the counterpart member 51 as well as the top plate 67 of the connecting pipe 10 so as not to interfere with fastening of the bolts 31, etc.
Then, only a tip portion of the bolt 31 is threadedly engaged with the lower embedded shaft 21 in the one member 41, and the counterpart member 51 in a raised position is moved down gradually to start fitting the connecting pipe 10 in the upright groove 44 in the one member 41. Then, the shaft portion of the aforementioned bolt 31 enters the inside of the lateral groove 37. Finally, the connecting pipe 10 contacts the upward surface 45 of the one member 41. By fastening all the bolts 31 from the inside of the connecting pipe 10 thereafter, formation of a connection between the one member 41 and the counterpart member 51 is completed.
Claims
1. A connecting structure between a first rod-shaped member and a second rod-shaped member,
- the connecting structure comprising:
- a hollow connecting pipe disposed to straddle contact surfaces with the first rod-shaped member and the second rod-shaped member; and
- a fixing unit including a bolt with which the connecting pipe is integrated with the first rod-shaped member and the second rod-shaped member,
- the first rod-shaped member and the second rod-shaped member including upright grooves configured to house the connecting pipe entirely, the upright grooves facing each other to dispose the contact surfaces therebetween and extending vertically,
- the connecting pipe having a side surface provided with a lateral hole configured such that the fixing unit including the bolt is inserted thereinto,
- the upright grooves extending toward without reaching a lower surface of the first rod-shaped member and a lower surface of the second rod-shaped member, and
- the upright grooves having respective bottoms serving as upward surfaces configured such that the connecting pipe is placed thereon.
2. The connecting structure according to claim 1, wherein
- the fixing unit is formed of an embedded shaft to be embedded in pilot holes formed in back surfaces of the upright grooves and the bolt to be inserted into the lateral hole, and
- the embedded shaft has an end surface where a female screw is provided to be threadedly engaged with the bolt.
3. The connecting structure according to claim 1, wherein
- the upright grooves are formed such that a surface of at least one of the first rod-shaped member and the second rod-shaped member is hollowed out, and
- downward surfaces facing an upper surface of the connecting pipe are provided at upper parts of the upright grooves.
4. The connecting structure according to claim 2, wherein
- the upright grooves are formed such that a surface of at least one of the first rod-shaped member and the second rod-shaped member is hollowed out, and
- downward surfaces facing an upper surface of the connecting pipe are provided at upper parts of the upright grooves.
Type: Application
Filed: Nov 5, 2014
Publication Date: Oct 6, 2016
Inventor: Kenho OKURA (Namerikawa-shi, Toyama)
Application Number: 15/033,837