Construction method for secondary connection of steel strands and sleeves in spring-loaded prestressed square piles

Abstract

This invention relates to the field of building construction technology, specifically a construction method for secondary connection of steel strands and sleeves in spring-loaded prestressed square piles. The method connects the steel strands and sleeves via existing piers and connecting cylinders. One end of the steel strand with the pier enters the connecting cylinder through a T-shaped notch. The pier is located inside the connecting cylinder and is secured above a U-shaped notch in the base plate. The sleeve and connecting cylinder are tightened together, sealing the horizontal section of the T-shaped notch on the connecting cylinder to prevent the steel strand from slipping out. This method enables rapid secondary connection of the steel strands and sleeves, allowing for on-site repair, avoiding secondary construction, significantly shortening the construction period, and saving construction costs.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically a construction method for secondary connection of spring-loaded prestressed square pile steel strands and sleeves. Background Technology

[0002] During construction, the connection method for anchoring reinforcing bars in prestressed concrete square piles using a spring-loaded clamp is as follows: the steel strands are topped and then connected to the pile head sleeve. The pile head sleeve is manufactured by the original manufacturer. During pile foundation construction, the sleeve is fitted onto the prestressed steel strands in the pile body, and then the steel strands are topped and fixed. However, during construction, sleeve damage and deformation commonly occur, making it impossible to install the anchoring reinforcing bars properly. In this case, the damaged sleeve needs to be removed, the original topped end cut off, and a new sleeve replaced before a second topped end treatment of the steel strands. However, because the pile foundation has already been constructed, the length of the steel strands protruding from the pile foundation is limited. Cutting off the original topped end may result in insufficient length of steel strands protruding from the pile foundation, making a second topped end treatment impossible. This necessitates the addition of additional piles to the relevant pile foundation, significantly impacting the construction progress and increasing construction costs. Summary of the Invention

[0003] The present invention aims to solve the above problems, thereby providing a construction method for secondary connection of spring-loaded prestressed square pile steel strands and sleeves.

[0004] The technical solution adopted by the present invention to solve the aforementioned problem is as follows:

[0005] A construction method for secondary connection of spring-loaded prestressed square pile steel strands and sleeves is carried out according to the following steps:

[0006] Step 1: Remove the damaged sleeve;

[0007] Step 2: Make a connecting sleeve according to the specifications of the steel strand. One end of the connecting sleeve has an external thread structure, and the other end has a closed structure. The connecting sleeve is sealed by a base plate. The base plate is welded to the connecting sleeve. A T-shaped notch is opened inward on one side of the connecting sleeve. The horizontal section of the T-shaped notch is located on the section of the connecting sleeve with the external thread, and the vertical section of the T-shaped notch is located below the horizontal section and extends downward. A U-shaped notch is opened on the base plate. The U-shaped notch is connected to the T-shaped notch. The end of the steel strand with the head can enter the interior of the connecting sleeve through the T-shaped notch. The head of the steel strand is stuck above the U-shaped notch of the base plate.

[0008] Step 3: Prepare a sleeve. The inner wall of the bottom of the sleeve has an internal thread, which can be threaded to the end of the connecting sleeve that has an external thread.

[0009] Step 4: Insert the end of the steel strand with the end cap into the connecting cylinder through the T-shaped notch;

[0010] Step 5: Connect the sleeve to the connecting cylinder. After tightening, the sleeve will block the horizontal section of the T-shaped notch on the connecting cylinder to prevent the steel strand from coming out. The end of the steel strand will be located inside the connecting cylinder and stuck above the U-shaped notch on the bottom plate. This completes the secondary connection between the steel strand and the sleeve.

[0011] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0012] The method described in this invention connects the steel strand and the sleeve using the existing end cap and connecting cylinder. One end of the steel strand with the end cap enters the connecting cylinder through a T-shaped notch. The end cap is located inside the connecting cylinder and is secured above the U-shaped notch on the bottom plate. The sleeve and connecting cylinder are tightened together, sealing the horizontal section of the T-shaped notch on the connecting cylinder to prevent the steel strand from slipping out. This allows for a quick secondary connection between the steel strand and the sleeve, enabling on-site repair and avoiding secondary construction. This significantly shortens the construction period and saves on construction costs.

[0013] As a preferred embodiment, a further technical solution of the present invention is:

[0014] The vertical section of the T-shaped notch is the same width as the U-shaped notch, and its width is greater than the outer diameter of the steel strand, while being smaller than the maximum diameter of the pier head.

[0015] The curved edge of the U-shaped opening bends downwards. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall installation structure according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the steel strand structure according to an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the main structure of the connecting cylinder according to an embodiment of the present invention;

[0019] Figure 4 This is a top view of the connecting cylinder structure according to an embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the main view structure of the sleeve according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of the installation structure of the connecting cylinder and the steel strand in an embodiment of the present invention;

[0022] The components in the diagram are labeled as follows: steel strand 1, connecting cylinder 2, sleeve 3, head 1-1, external thread structure 2-1, T-shaped notch 2-2, base plate 2-3, U-shaped notch 2-4, arc edge 2-5, and internal thread structure 3-1. Detailed Implementation

[0023] The present invention will be further described below with reference to embodiments, which are intended only to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0024] See Figures 1-5 A construction method for secondary connection of spring-loaded prestressed square pile steel strands and sleeves is carried out according to the following steps:

[0025] Step 1: Remove the damaged sleeve; during the removal process, it is strictly forbidden to damage the steel strand 1 and its end cap 1-1. After removal, if... Figure 2 As shown;

[0026] Step 2: According to the specifications of the steel strand 1, the connecting sleeve 3 is made into a connecting cylinder 2. One end of the connecting cylinder 2 has an external thread structure 2-1, and the other end is a closed structure. The connecting cylinder 2 is sealed by the bottom plate 2-3. The bottom plate 2-3 is welded to the connecting cylinder 2. A T-shaped notch 2-2 is opened inward on one side of the connecting cylinder 2. The horizontal section of the T-shaped notch 2-2 is located on the section of the connecting cylinder 2 with the external thread, and the vertical section of the T-shaped notch 2-2 is located below the horizontal section and extends downward. A U-shaped notch 2-4 is opened on the bottom plate 2-3. The U-shaped notch 2-4 is connected to the T-shaped notch 2-2. The end of the steel strand 1 with the head 1-1 can enter the interior of the connecting cylinder 2 through the T-shaped notch 2-2. The head 1-1 of the steel strand 1 is stuck above the U-shaped notch 2-4 of the bottom plate 2-3.

[0027] Step 3: Prepare sleeve 3. The inner wall of the bottom of sleeve 3 has an internal thread 3-1, which can be threaded to the end of connecting sleeve 2 that has an external thread.

[0028] Step 4: Insert the end of the steel strand 1 with the head 1-1 into the inside of the connecting cylinder 2 through the T-shaped notch 2-2;

[0029] Step 5: Connect sleeve 3 to connecting cylinder 2. After tightening, sleeve 3 will block the horizontal section of the T-shaped notch 2-2 on connecting cylinder 2 to prevent the steel strand 1 from coming out. The end 1-1 of the steel strand 1 is located inside the connecting cylinder 2 and is stuck above the U-shaped notch 2-4 on the bottom plate 2-3. This completes the secondary connection between the steel strand 1 and sleeve 3.

[0030] The vertical section of the T-shaped notch is the same width as the U-shaped notch, and its width is greater than the outer diameter of the steel strand, while being smaller than the maximum diameter of the pier head.

[0031] The arc-shaped edge 2-5 of the U-shaped notch 2-4 bends downward to form a sinking groove that matches the bottom of the pier head 1-1. The pier head 1-1 falls into the sinking groove to position the steel strand 1.

[0032] The method described in this invention connects the steel strand and the sleeve using the existing end cap and connecting cylinder. One end of the steel strand with the end cap enters the connecting cylinder through a T-shaped notch. The end cap is located inside the connecting cylinder and is secured above the U-shaped notch on the bottom plate. The sleeve and connecting cylinder are tightened together, sealing the horizontal section of the T-shaped notch on the connecting cylinder to prevent the steel strand from slipping out. This allows for a quick secondary connection between the steel strand and the sleeve, enabling on-site repair and avoiding secondary construction. This significantly shortens the construction period and saves on construction costs.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A construction method for secondary connection of steel strands and sleeves in a spring-loaded prestressed square pile, characterized in that, Follow these steps: Step 1: Remove the damaged sleeve; Step 2: Fabricate a connecting sleeve according to the specifications of the steel strand. One end of the connecting sleeve has an external thread structure, and the other end has a closed structure. The connecting sleeve is sealed by a base plate, which is welded to the connecting sleeve. A T-shaped notch is opened inward on one side of the connecting sleeve. The horizontal section of the T-shaped notch is located on the external thread section of the connecting sleeve, and the vertical section of the T-shaped notch extends downward below the horizontal section. A U-shaped notch is opened on the base plate, which is connected to the T-shaped notch. The end of the steel strand with the head can enter the interior of the connecting sleeve through the T-shaped notch. The head of the steel strand is stuck above the U-shaped notch on the base plate. The vertical section of the T-shaped notch is the same width as the U-shaped notch, and its width is greater than the outer diameter of the steel strand, but smaller than the maximum diameter of the head. The arc edge of the U-shaped notch is bent downward. Step 3: Prepare a sleeve. The inner wall of the bottom of the sleeve has an internal thread, which can be threaded to the end of the connecting sleeve that has an external thread. Step 4: Insert the end of the steel strand with the end cap into the connecting cylinder through the T-shaped notch; Step 5: Connect the sleeve to the connecting cylinder and tighten it. The sleeve will then seal the horizontal section of the T-shaped notch on the connecting cylinder to prevent the steel strand from coming out. The end of the steel strand will be located inside the connecting cylinder and locked above the U-shaped notch on the bottom plate. This completes the secondary connection between the steel strand and the sleeve.

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