Abstract: Disclosed is an automatic hoisting and transporting method for a tower crane, the method including: building a three-dimensional grid model for a construction site, and generating a grid node set; generating an obstacle node set and a feasible area node set; obtaining coordinates of an initial node and an end node; planning a hoisting and transporting path from the initial node to the end node, and generating corresponding operating parameters; controlling the tower crane to transport an object according to the operating parameters, and calculating a swing range of the hoisted and transported object and a swing arm at a current position; determining whether a collision may occur; and predicting whether the tower crane may be overturned. The method realizes automatic hoisting and transporting of the tower crane. The object does not collide with an obstacle during hoisting and transporting, thereby ensuring safe operation of the tower crane.

Abstract: Provided is an apparatus and method for detecting grout compactness in grouted splice sleeve, the apparatus comprises a probe assembly, which comprises at least one of capacitive probe and piezoelectric sensor and is arranged inside the grouted splice sleeve to detect parameters of the sleeve during grouting and curing and a detector, which comprises at least an analysis module that is connected with the probe assembly to obtain the detected parameters and carry out calculation and analysis for the parameters. The probe assembly is arranged inside the grouted splice sleeve and forms a loop with the detector during grouting, such that during the process of grouting, the detected parameters will be changed as the surrounding dielectric changes, therefore, the detector may determine in real time whether the grouted splice sleeve is fully grouted by calculating and analyzing the detected parameters, which achieves a faster and easier grout compactness detection.

Abstract: Provided is a drilling apparatus, comprising a PHC pipe cased pile having a drilling section for containing fluid and a hammer element arranged inside the cavity of the PHC pipe cased pile which moves along the drilling direction till the bottom of the drilling section. As the hammer element moves along the drilling direction till the bottom of the drilling section, a localized hydraulic force will be induced in the fluid contained in the drilling section of the PHC pipe cased pile by a sharp rise in the fluid pressure in addition to the impact force directly acted on the rock and soil by the hammer element. Under action of the hydraulic force and the impact force, the surrounding soft rock stratum could be crushed and the rock stratum with higher strength is left intact, that is, the drilling apparatus proceeds until harder rock. At this point, concrete casting will bond with the harder rock, resulting in a better bearing capacity of the PHC pipe cased pile foundation.

Abstract: Provided is a drilling apparatus, comprising a PHC pipe cased pile having a drilling section for containing fluid and a hammer element arranged inside the cavity of the PHC pipe cased pile which moves along the drilling direction till the bottom of the drilling section. As the hammer element moves along the drilling direction till the bottom of the drilling section, a localized hydraulic force will be induced in the fluid contained in the drilling section of the PHC pipe cased pile by a sharp rise in the fluid pressure in addition to the impact force directly acted on the rock and soil by the hammer element. Under action of the hydraulic force and the impact force, the surrounding soft rock stratum could be crushed and the rock stratum with higher strength is left intact, that is, the drilling apparatus proceeds until harder rock. At this point, concrete casting will bond with the harder rock, resulting in a better bearing capacity of the PHC pipe cased pile foundation.

Abstract: The present application discloses a construction method for pouring concrete in a karst cave. Concrete streaming is pumped into a hollow passage of a drill stem, then opens the one-way openable sealing cover with a pre-tensioned spring on a reaming drill bit and enters the karst cave to complete pouring of the concrete. When the karst cave is relatively low, low-slump plain concrete mixed with quick-setting agents is injected through a drilling rig and the hollow drill stem to form a concrete pier; when the karst cave is relatively high, the hollow drill stem is sleeved into a thin-walled steel shell, and the thin-walled steel shell is synchronously sunk into the drilled hole while drilling, enters the karst cave and is socketed into a stable rock stratum, then concrete is pumped into the thin-walled steel shell from the bottom of the pile, and finally, a reinforcement cage is inserted to form a cast-in-place pile.

Abstract: Provided is an apparatus and method for detecting grout compactness in grouted splice sleeve, the apparatus comprises a probe assembly, which comprises at least one of capacitive probe and piezoelectric sensor and is arranged inside the grouted splice sleeve to detect parameters of the sleeve during grouting and curing and a detector, which comprises at least an analysis module that is connected with the probe assembly to obtain the detected parameters and carry out calculation and analysis for the parameters. The probe assembly is arranged inside the grouted splice sleeve and forms a loop with the detector during grouting, such that during the process of grouting, the detected parameters will be changed as the surrounding dielectric changes, therefore, the detector may determine in real time whether the grouted splice sleeve is fully grouted by calculating and analyzing the detected parameters, which achieves a faster and easier grout compactness detection.

Abstract: The present application discloses a construction method for pouring concrete in a karst cave. Concrete streaming is pumped into a hollow passage of a drill stem, then opens the one-way openable sealing cover with a pre-tensioned spring on a reaming drill bit and enters the karst cave to complete pouring of the concrete. When the karst cave is relatively low, low-slump plain concrete mixed with quick-setting agents is injected through a drilling rig and the hollow drill stem to form a concrete pier; when the karst cave is relatively high, the hollow drill stem is sleeved into a thin-walled steel shell, and the thin-walled steel shell is synchronously sunk into the drilled hole while drilling, enters the karst cave and is socketed into a stable rock stratum, then concrete is pumped into the thin-walled steel shell from the bottom of the pile, and finally, a reinforcement cage is inserted to form a cast-in-place pile.

Abstract: Provided is a construction method for foundation pit support utilizing prefabricated large-diameter pipe pile, through this method the pipe pile can be sunk into a hole being drilled. The method applies to a large-diameter pipe pile being sunk. All of components, such as the prefabricated capping beam configured to fix all pile heads and the prefabricated waist beam configured to secure the pile bodies, can ensure the excellent fixture of the pipe piles during the construction of the foundation pit. This method has a good retaining and protecting effect when applied to construction of a deep foundation pit requiring large-diameter pipe pile. It can reduce the environmental impact caused by waste soil and mud discharge in traditional cast-in-place construction, and the use of prefabricated components decreased the construction period and improved the construction efficiency.

Abstract: The present invention relates to a quick coupling for pipe pile, comprising an upper end plate, a lower end plate and a screw hook made of spring steel for coupling the upper and lower end plate, a plurality of tapped holes are uniformly provided on the upper end plate, a plurality of holes corresponding to the tapped holes are provided on the lower end plate, a lock hole is positioned at the lower portion of the hole, while the cross-section area of the lock hole is bigger than the cross-section area of the hole. One end of the screw hook is provided with a screw end mating with the tapped hole on the upper end plate, while the other end is provided with a hook end mating with the lock hole on the lower end plate, whereby the upper and lower end plate can be coupled firmly.

Abstract: The present invention relates to a quick coupling for pipe pile, comprising an upper end plate, a lower end plate and a screw hook made of spring steel for coupling the upper and lower end plate, a plurality of tapped holes are uniformly provided on the upper end plate, a plurality of holes corresponding to the tapped holes are provided on the lower end plate, a lock hole is positioned at the lower portion of the hole, while the cross-section area of the lock hole is bigger than the cross-section area of the hole. One end of the screw hook is provided with a screw end mating with the tapped hole on the upper end plate, while the other end is provided with a hook end mating with the lock hole on the lower end plate, whereby the upper and lower end plate can be coupled firmly.