A connection device for pull-out piles and water-resistant plates

Abstract

The present invention discloses a connection device for pull-out piles and water-resistant plates, which relates to the field of pull-out piles and water-resistant plates, including prestressed pipe piles without pile heads and water-resistant plates. The pile heads of the prestressed pipe piles extend into the interior of the locally thickened area of ​​the water-resistant plates, the inner core of the prestressed pipe piles is sealed with a thick steel plate, and the outer side of the pile ends of the prestressed pipe piles is welded with an annular steel plate. The connection nodes between the pull-out piles and the water-resistant plates of the present invention are clearly stressed, and the construction is simple, which can ensure the quality of the connection nodes. The high construction speed can effectively speed up the construction progress of the project and further save the project cost. Moreover, after the device is welded on site, the next construction process can be carried out without waiting for a certain period of time, which greatly saves time.

Description

Technical Field

[0001] The invention relates to the field of pull-out piles and water-resistant boards, and in particular to a connecting device for pull-out piles and water-resistant boards. Background Art

[0002] In recent years, frequent extreme weather events and rising urban groundwater levels have led to an increasing number of accidents caused by building anti-floating failures. Anti-floating measures in engineering projects are categorized into two types: active and passive. The pull-out piles and anti-floating anchors used in engineering projects are both passive anti-floating measures. Anti-floating anchors are categorized into prestressed and non-prestressed types based on the stress distribution in the anchoring section.

[0003] Prestressed anchor rods are rarely used in projects due to their complex on-site construction process and high cost. Non-prestressed anchor rods are more commonly used in projects due to their ease of on-site construction. Years of field test data on non-prestressed anchor rods reveal their low pull-out stiffness, susceptibility to failure, and poor durability. Commonly used waterproofing panels in projects have a thickness of 300mm to 500mm, which does not meet the standard requirement for a straight anchor length of 0.6la ≈ 21d for rebar. For a 25mm diameter rebar, h = 25*21 + 35 = 565mm, which is greater than 500mm.

[0004] Currently, the connection between the pull-out pile and the waterproofing plate is achieved through a mechanical sleeve coupled with an internal reinforced concrete insert on the pull-out pile end plate. Due to site conditions and varying levels of skill among on-site construction workers, the quality of the internal concrete pouring directly impacts the pile's bearing capacity. This connection method also requires significant time, hindering project progress and increasing the workload of construction personnel. After pouring the internal concrete insert, it takes 28 days for the concrete strength to reach the design requirements, wasting significant time and impacting construction efficiency. Therefore, the commonly used joints for pull-out precast piles are a combination of a mechanical sleeve and an internal core connection. This approach consumes a significant amount of steel and results in a prolonged construction period. Summary of the Invention

[0005] The object of the present invention is to provide a connection device for an anti-pullout pile and a water-resistant plate, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a connection device for pull-out piles and water-resistant plates, comprising a prestressed pipe pile without a cut-off pile head and a water-resistant plate, the pile head of the prestressed pipe pile extending into the interior of a locally thickened area of ​​the water-resistant plate, the inner core of the prestressed pipe pile being sealed with a thick steel plate, and an annular steel plate being welded to the outside of the pile end of the prestressed pipe pile.

[0007] Preferably, the top of the prestressed pipe pile is provided with an end steel plate and a hoop steel plate, and the annular steel plate is welded to the outer side of the end steel plate.

[0008] Preferably, the height of the locally thickened area of ​​the waterproof board from the board surface of the waterproof board is 100-150 mm, and the thickness of the thickening is reduced to meet the punching requirements.

[0009] Preferably, the hoop steel plate is 3-5 mm thicker than the hoop steel plate of a conventional precast pile to ensure the welding quality of the annular steel plate.

[0010] Preferably, the thick steel plate is a cover plate for the holes at the ends of the prestressed pipe piles, and has a thickness of 3 mm.

[0011] A method for connecting an anti-pullout pile and a water-resistant plate, using the above-mentioned device for connecting an anti-pullout pile and a water-resistant plate:

[0012] S1. Determine the required number of pullout piles and their characteristic values ​​based on the anti-floating water level and structural design load provided by the geological survey. Construction will be carried out according to the pile length and elevation determined by the geological survey parameters. Construction will be controlled by elevation, with the pile top elevation extending 100-150mm below the top elevation of the waterproofing plate. Determine the overhang width of the annular steel plate and the thickness of the waterproofing plate according to the punching shear calculation in the "Code for Design of Concrete Structures."

[0013] S2. After the prestressed piles have been constructed to the designed elevation, an annular steel plate is welded to the ends of the piles. The thickness of the annular steel plate should be 20-30mm and the width should be 50-150mm. Clean the connection area with a steel brush before welding.

[0014] S3. Use 3mm thick steel plates to seal the holes of the prestressed piles. Spot weld the sealing plates to the pile end plates.

[0015] S4. Complete foundation construction by integrally pouring water-resistant concrete slabs.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a clear force connection between the pull-out pile and the waterproof plate, simplifies construction, ensures the quality of the connection, and accelerates construction speed, effectively accelerating the project progress and further reducing construction costs. Compared with the existing technology, which takes 28 days after pouring the core concrete for the concrete strength to meet the design requirements, wasting a lot of time and affecting construction efficiency, the present device can proceed to the next construction process after on-site welding, eliminating the need to wait for a certain period of time, thus significantly saving time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of the connection structure of the present invention;

[0019] Figure 2 It is a top view of the connection of the present invention.

[0020] In the figure: 1. Prestressed pipe pile; 2. Water-resistant plate; 5. Annular steel plate; 6. Cover plate for the hole at the end of the pipe pile; 8. End steel plate; 9. Hoop steel plate. DETAILED DESCRIPTION

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-2 This embodiment provides a connection device for an uplift pile and a waterproof plate. The device comprises a stressed annular steel plate 5, an uncapped prestressed pipe pile 1, and a waterproof plate 2. The annular steel plate 5 is welded around the end of the prestressed pipe pile 1, forming a single unit with the uplift pile. The annular steel plate 5 must have sufficient rigidity, an overhang width of 50-150 mm, and a thickness of 20-30 mm.

[0023] In a further embodiment, the top of the prestressed pipe pile 1 is provided with an end steel plate 8 and a head hoop steel plate 9, the end steel plate 8 and the hoop steel plate 9 are both fixed to the prestressed pipe pile 1, the annular steel plate 5 is welded to the outside of the end steel plate 8, and the thickness of the hoop steel plate 9 is 3-5 mm thicker than that of the conventional pipe pile to ensure the welding quality of the annular steel plate.

[0024] The inner core of the prestressed pipe pile 1 is sealed with a thick steel plate, which is located at the end of the pipe pile. The thick steel plate is a cover plate 6 for the hole at the end of the pipe pile, and its thickness is 3 mm.

[0025] The pile head of the prestressed pipe pile 1 extends into the interior of the local thickening area of ​​the waterproof board 2, and the pile top elevation should extend to 100 to 150 mm below the top elevation of the waterproof board. The thickening thickness is reduced to meet the shearing requirements. The plane size of the local thickening area of ​​the waterproof board 2 is larger than the shearing bottom edge line.

[0026] During construction, the following steps can be used for construction operations:

[0027] 1. Determine the required number of pullout piles and their characteristic values ​​based on the anti-floating water level and structural design load provided by the geological survey. Construction is carried out according to the pile length and elevation determined by the geological survey parameters. Construction is controlled by elevation, with the pile top elevation extending 100-150mm below the top elevation of the waterproof plate 2. Determine the overhang width of the annular steel plate 5 and the thickness of the waterproof plate according to the punching shear calculation in the "Code for Design of Concrete Structures."

[0028] 2. After the prestressed pipe pile 1 is constructed to the designed elevation, an annular steel plate 5 is welded to the end of the prestressed pipe pile 1. The thickness of the annular steel plate is 20-30mm and the width is 50-150mm. Clean the connection position with a steel brush before welding.

[0029] 3. Use 3mm thick steel plates to seal the holes of prestressed pipe piles, and spot weld the sealing steel plates to the end plates of the pipe piles;

[0030] 4. Complete the foundation construction by pouring the water-resistant concrete board as a whole.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for connecting an anti-pullout pile and a waterproof plate, characterized by: It comprises a prestressed pipe pile (1) without a pile head cut off and a water-resistant plate (2), wherein the pile head of the prestressed pipe pile (1) extends into the interior of a locally thickened area of ​​the water-resistant plate (2), the inner core of the prestressed pipe pile (1) is sealed with a thick steel plate, and an annular steel plate (5) is welded to the outer side of the pile end of the prestressed pipe pile (1); The top of the prestressed pipe pile (1) is provided with an end steel plate (8) and a hoop steel plate (9), and the annular steel plate (5) is welded to the outside of the end steel plate (8); The height of the locally thickened area of ​​the waterproof plate (2) from the plate surface of the waterproof plate (2) is 100-150 mm.

2. The device for connecting an anti-pullout pile and a waterproof plate according to claim 1, characterized in that: The hoop steel plate (9) is 3-5 mm thicker than the hoop steel plate of a conventional prefabricated pile.

3. The device for connecting an anti-pullout pile and a waterproof plate according to claim 1, characterized in that: The thick steel plate is a pipe pile end hole cover plate (6) provided at the pipe pile end of the prestressed pipe pile (1), and has a thickness of 3 mm.

4. A method for connecting an anti-pullout pile and a waterproof board, using the device for connecting an anti-pullout pile and a waterproof board according to claim 1, characterized in that: S1. Determine the number of pull-out piles required and the characteristic value of the pull-out piles based on the anti-floating water level and structural design load provided by the geological survey, and carry out construction according to the pile length and elevation determined by the geological survey parameters. The construction is controlled by the elevation, and the pile top elevation extends to 100~150mm below the top elevation of the water-resistant plate (2); determine the extension width of the annular steel plate (5) and the thickness of the water-resistant plate according to the punching calculation of the "Concrete Structure Design Code"; S2. After the prestressed pipe pile (1) is constructed to the design elevation, the annular steel plate (5) is welded at the end of the prestressed pipe pile (1). The thickness of the annular steel plate is 20-30mm and the width is 50-150mm. Clean the connection position with a steel brush before welding. S3. Use 3mm thick steel plates to seal the holes of the prestressed piles. Spot weld the sealing plates to the pile end plates. S4. Complete foundation construction by integrally pouring water-resistant concrete slabs.

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