Abstract: A method for producing a phosphate diester or a phosphate triester is provided in which the phosphate diester or the phosphate triester can be produced from phosphoric acid and a hydroxy compound. Phosphoric acid and a phenol, which is used in excess with respect to the phosphoric acid, are subjected to dehydrating condensation with heating and refluxing. Water released during this dehydrating condensation is adsorbed onto a dehydrating material, which is an adsorbent derived from concrete sludge, disposed somewhere in the refluxing channel, thereby producing a phosphate diester or a phosphate triester.

Abstract: A dephosphorization material is formed from concrete sludge resulting from centrifugal casting of concrete products, production of concrete, cleaning of concrete production equipment, or cleaning of concrete transporting vehicles. The dephosphorization material is used for dephosphorization treatment by a dephosphorization apparatus that includes a single reaction tank provided with a wastewater supply means, a dephosphorization material supply mean, and a recovery means. The dephosphorization apparatus removes phosphorus from phosphorus-containing wastewater, such as sewage water, based on the formula 10Ca2++6PO43?+2OH??Ca10(PO4)6(OH)2 and recovers through the recovery means a dephosphorization by-product that precipitates as crystals as a result of the reaction.

Abstract: This invention relates to foundation work of structures in a very cold district, especially to a method of preventing the upward movement of foundation pillars in weak ground in which concrete piles are required as foundation pillars. Concrete piles are driven to a permanent frozen stratum passing through a weak stratum which repeats freeze and melt conditions according to the atmospheric change and the like, and then the concrete piles themselves are cooled artificially or by utilizing the ultra-low temperature of the permanent frozen stratum during the period of refreeze of the weak stratum in order to make frozen parts in the weak stratum around each concrete pile.

Abstract: This invention relates to a method of setting a pile without causing any noise or vibration. A hollow pile is erected along a leader fixed on the ground, a screw auger is inserted through the hollow center of the pile, the screw auger is hung on the leader in such a manner that it can freely move up and down and freely rotate, and the pile is sunk by its own weight as the soil below the bottom of the pile is excavated and the excavated soil is carried above the ground. The present invention further relates to an apparatus for executing the above method. The lower part of the screw auger is constructed in such a manner that it is divided into two parts, inner tube and outer tube, and both tubes can rotate through a certain angle and move up and down in a certain range relatively to each other.

Abstract: The present invention relates to a process of setting a concrete pile without noise or vibration which is thereby effective to decrease city noises. A concrete pile is sunk into a leading hole substantially concurrently with the progress of the excavation thereof. After the pile has been sunk through a desired distance, another supporting hole is excavated below the pile. A solidifying material, such as cement milk, mortar, or cement concrete including a cement expansion agent of calcium sulfoaluminate system or lime system, is poured into the supporting hole. The solidifying material is expanded within the supporting hole and permeates into the circumferential wall thereof, which is loosened by the excavation, so as to retighten the wall. Therefore, sufficient supporting force can be obtained.

Abstract: This invention relates to a concrete pile having a steel plate, of a semi-cylindrical shape,integrally fixed at the outer periphery thereof. The steel plate has a number of connectors protruding beyond the inner surface so as to thrust into concrete. The connectors are formed by performing the incomplete blanking of the steel plate. When the concrete pile is subjected to a concentrated load or a large bending moment, it can be reinforced by means of the steel plate. The operation of attaching a waling to the concrete pile can be also easily performed through means of the steel plate.

Abstract: This invention relates to a method of making reinforcements for concrete, in which a band material of a thin steel plate which has a certain thickness and a certain width and or which both ends are bent is fed until it contacts with a rotating cutter wheel having edges which height is approximately same as the thickness of the said plate, and the said material is cut so that reinforcements of a certain dimension are continuously made; and an apparatus therefor comprising a cutter wheel, a pushing plate and a supporter which constitute a cutting part, and some couples of belt pulleys to continuously feed the material, or further having an equipment to bend both ends of the said material.

Abstract: This invention relates to a concrete pole having a reinforcing band and a cylindrical projection, protruding upward, at the outer periphery of the upper end, and a method of replacing the lower part of a wood pole with the said concrete pole. In order to replace the lower part of a wood pole, the lower part is first cut away from the upper part of the wood pole in use, and pulled out of the ground. Subsequently, the concrete pole is driven instead of the removed lower wood pole. Thereafter, the lower end of the upper wood pole is inserted into the cylindrical projection so as to be integrally connected with the concrete pole.

Abstract: This invention relates to connected parts of a long concrete pipe made by connectng some short concrete poles or concrete piles which are separately manufactured. Especially in case that a bending moment acts on an upper part of a concrete pipe having connected parts, in order to increase the strength of the connected part against the bending moment an annular concave part is made on the outer periphery of the joined part of end plates which are fixed to reinforcements at the ends of concrete pipes, and a reinforcing split ring is inserted into the said concave part and is welded to the said end plates.

Abstract: This invention relates to a method of making reinforcements for concrete, in which a band material of one or two overlapped very thin steel plates which has a certain thickness and a ceratin width is bent and cut at a rotating cutter wheel having cutting teeth which height is approximately twice the thickness of the said plate so that reinforcements of a certain dimension are continuously made; and an apparatus therefor comprising a cutter wheel, a pushing plate and a supporter which constitute a cutting part, and some couples of belt pulleys to continuously feed the material, or further having an equipment to bend both edges of the said material of two overlapped steel plates.

Abstract: This invention relates to a method of constructing a continuous wall for supporting earth by continuously setting a number of steel sheet piles, in which a hole is bored with a screw auger, a sheet pile is sunk into the said hole with the boring, a joint of the said sheet pile is engaged with a corresponding joint of the following sheet pile, the said following sheet pile is sunk with the boring of a hole for the said following sheet pile with the said screw auger, and these operations are repeated; and further into the said holes concrete is placed or concrete piles are sunk as required.

Abstract: This invention relates to an apparatus for tensioning reinforcements in the process of manufacturing concrete poles and the like having the structure in which a tension plate of a circular ring shape is fixed to an end plate for setting reinforcements placed inside a mold in a freely slidable manner, the inner surface of the tension plate is engaged with a jack rod, the outer periphery of the tension plate is provided with a plurality of protuberances whose thickness is less than that of the tension plate and which are spaced at equal intervals thereabout, a set ring of a circular ring shape is provided for contacting a flange part at the end of the mold, and the inner surface of the set ring is contacted with the outer periphery of the tension plate and has a plurality of concave parts into which the said protuberances can be disposed; and additional structure by which methods of engaging the tension plate with the jack rod and disengaging the plate from the rod are able to be accomplished in different ways.

Abstract: This invention relates to an apparatus for transferring a mold from a centrifugal compacting device to the next place in the process of manufacturing a concrete pole or pile, by using many jacks to raise a mold from on the centrifugal compacting device for the transferring operation to rails on which the mold is put to be transferred to the next place.

Abstract: This invention relates to a method of inserting tension wires in the process of wire assembling for a concrete pole or pile characterized in that forward ends of a required number of tension wires are clamped together by a chuck, and the chuck is inserted from one end of a wire cage to the other end and interiorly thereof, so that a number of tension wires can be inserted into the wire cage at one time.

Abstract: This invention relates to an apparatus for manufacturing concrete poles which has a train system running on a rail and stays on a required place to manufacture concrete poles, and is characterized in comprising at least a wire storage device, a caging stand, a mold traverser, a spinning machine and a device for carrying materials or products.

Abstract: This invention relates to an apparatus for cutting away rivets of tensioned reinforcements which are protruding beyond the surface of a tension plate used for tensioning the reinforcements in order to increase the strength of a concrete product, characterized in that a chisel, for cutting rivets formed at the end of the tensioned reinforcements, is provided in such a manner that it can slide along the normal line of the tension plate and in contact with the surface of the tension plate, the chisel being interlocked with a fluid-pressure sliding mechanism, and further an immovable part of the mechanism is engaged with a part of the tension plate so that the counter force against the cutting by the chisel is obtained from the tension plate.

Abstract: This invention relates to an apparatus for lifting up and carrying concrete poles characterized by comprising beams to be lifted up by a crane or the like, cylinders which are respectively provided under each beam at certain intervals and which section has a downward C-shape and further which inner surface is formed into a taper same as that of a pole so that the cylinders can lift up the pole by adhereing to the pole at determined positions, and a safety confirmation equipment to confirm the adhered condition; and the object of the invention is to lift up and carry long tapered concrete poles safely, surely and efficiently.

Abstract: This invention relates to an apparatus for automatically adjusting the center-height of a mold and the like which are used for manufacturing concrete pipes characterized in comprising a supporting device which supports a mold and the like for manufacturing concrete pipes horizontally in the manner that the center of the axis of the mold moves vertically along a perpendicular line and stops it at a determined position, and a detecting device which detects the position of the mold by contacting with the outside of it and controls and stops the movement of the said supporting device when the center of the mold is placed at the determined position.