Anti-pulling and anti-cracking structure for pile end of anti-pulling pile

Abstract

The utility model relates to an anti-pulling and anti-cracking structure of an anti-pulling pile end, the anti-pulling pile end is cylindrical, a protective hoop is sleeved on the peripheral surface of the anti-pulling pile end, the protective hoop comprises a buckle and an elastic deformation hoop, the buckle comprises a pull ring, a support, a bolt and a push block, the middle part of the support is in threaded connection with the bolt, and the bolt is connected with the rotary push block for positioning. Hook grooves are formed in two sides of the support; the end surface of the push block forms an arc-shaped support surface; the tension band is provided with a C-shaped opening, and the two ends of the tension band are each provided with a bent part used for hooking and pulling the connecting pull ring. When the hoop is connected to the peripheral face of the pile end of the uplift pile in a sleeving mode, the hook grooves in the two sides of the supporting bracket and the bent parts at the two ends of the corresponding hoop form opposite-pulling connection through the pull rings, and when the hoop is locked through the bolts, the hook grooves in the two sides of the supporting bracket and the bent parts at the two ends of the hoop are tensioned and fixed, and the hoop and the pile end of the uplift pile form hoop fixing. The arc-shaped supporting face of the push block abuts against the side face of the pile end of the uplift pile, the peripheral face of the pile end of the uplift pile is effectively protected, cracking and damage are not prone to occurring, and the accuracy of the uplift test result is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of anti-pulling pile construction and is an anti-pulling and anti-cracking structure at the pile end of an anti-pulling pile. Background Art

[0002] Anti-pulling piles in the construction field are widely used in anti-floating of large basements, anti-pulling of high-rise buildings (structures), anti-pulling of offshore wharf platforms, anchor pile foundations of suspension bridges and cable-stayed bridges, pile foundations of large dock floors, and anchor pile foundations in static load test piles, etc. It mainly refers to the piles driven when there is a part of the underground structure of a construction project below the surrounding soil water level to counteract the upward buoyancy force generated by the water in the soil on the structure. Its working mechanism mainly relies on the friction between the pile body and the soil layer to resist the axial tension. In order to prevent cracking, existing anti-pulling piles usually need to apply prestress to the internal structure of the pile in advance during construction, so that all or part of the tensile stress caused by the load can be offset during the service period of the structure, avoiding structural damage. Existing methods of applying prestress, such as the one disclosed in the Chinese patent document with the publication number CN116220011A, publication date June 6, 2023, and invention name "Construction method of slow-bonded prestressed anti-pulling pile", disclose that slow-bonded prestressed tendons are bound inside the steel reinforcement cage and penetrate through the entire steel reinforcement cage, and prestress is loaded by tensioning the slow-bonded prestressed tendons after the anti-pulling pile is formed. For the anti-pulling test scheme of existing slow-bonded prestressed anti-pulling piles, such as the one disclosed in the patent application publication number CN116378115A, application publication date July 4, 2023, and invention name "Anti-pulling bearing capacity test method for slow-bonded prestressed anti-pulling pile", it mainly discloses that the steel strand and steel bar are pulled by a jacking device to achieve the anti-pulling test. However, in existing anti-pulling tests, since there is no anti-cracking protection structure at the pile end of the anti-pulling pile, when pulling the steel strand or steel bar for the anti-pulling test, the problem of pile end breakage and cracking easily occurs, resulting in inaccurate test results or difficulty in further testing. Therefore, it is necessary to design an effective anti-cracking structure for the pile end during the anti-pulling test of existing anti-pulling piles to improve the accuracy of the anti-pulling test. Summary of the Invention

[0003] To overcome the above deficiencies, the purpose of the utility model is to provide an anti-pulling and anti-cracking structure at the pile end of an anti-pulling pile to the art, so as to solve the technical problem that the pile end of an existing anti-pulling pile lacks anti-cracking protection during the anti-pulling test, is prone to premature damage and cracking, and affects the anti-pulling test results. Its purpose is achieved through the following technical solutions.

[0004] An anti-pulling pile end anti-pulling and anti-cracking structure. The end of the anti-pulling pile is cylindrical, and several steel strands for anti-pulling tests are led out from the pile end. The key structural point is that a protective hoop is sleeved on the peripheral surface of the anti-pulling pile end. The protective hoop includes a buckle and an elastically deformable hoop. The buckle includes a pull ring, a support bracket, a bolt, and a push block. The middle of the support bracket is threadedly connected to the bolt. One end of the bolt is a screwing operation end, and the other end is provided with the push block for positioning and rotation. Grooves for hooking and connecting the pull ring are provided on both sides of the support bracket. An arc-shaped support surface is formed on the end face of the push block. The hoop is C-shaped and open, and bending parts for hooking and connecting the pull ring are provided at both ends of the hoop. When the hoop is sleeved on the peripheral surface of the anti-pulling pile end, the grooves on both sides of the support bracket are connected in a tension manner with the bending parts at both ends of the corresponding hoop through the pull ring. When the bolt is tightened, the grooves on both sides of the support bracket and the bending parts at both ends of the hoop are tightened and fixed, that is, the hoop and the anti-pulling pile end are fixed by a hoop. The arc-shaped support surface of the push block abuts against the side surface of the anti-pulling pile end at the C-shaped opening of the hoop when the bolt is tightened to form a support. Through the above protective hoop, the peripheral surface of the anti-pulling pile end is effectively protected, the pile end is not easily cracked and damaged, and the accuracy of the anti-pulling test result is ensured.

[0005] The threaded connection between the support bracket and the bolt is replaced by a bolt connecting a nut, and the nut is embedded and fixed in a nut groove on one side of the support bracket. Through this structure, when the thread is worn, there is no need to replace the support bracket, and only the nut needs to be replaced, which is more convenient to use.

[0006] The bolt and the push block are movably inserted and relatively rotatable. Through this structure, it is convenient to install a push block of the required size according to needs, and it is more convenient to use.

[0007] A guard plate for supporting the end face of the anti-pulling pile is integrally provided at the end of the hoop, and the guard plates are distributed in an annular and spaced array relative to the end face of the hoop. Through this structure, while the hoop protects the peripheral surface of the anti-pulling pile end, it forms a certain protection for the end face of the pile, further preventing the pile end from being damaged and cracked.

[0008] The bolt is replaced by a power cylinder, that is, the power cylinder is fixed on the support bracket, and the end of the push rod of the power cylinder is fixedly or movably connected to the push block. Through this structure, it is convenient for the hoop to achieve automatic clamping, reducing manual operation, and being more efficient and labor-saving.

[0009] The contact area between the arc-shaped support surface of the push block and the side surface of the anti-pulling pile end is not less than half of the area of the C-shaped opening after the hoop hugs the peripheral surface of the anti-pulling pile end. Through the combined use of the hoop and the push block, the peripheral surface of the anti-pulling pile end is covered and protected as much as possible, improving the protection effect.

[0010] The overall structure of the utility model is relatively simple, and it is convenient to install and use. It effectively protects the pile end of the anti-pulling pile, is not easy to crack and damage, ensures the accuracy of the anti-pulling test, and is suitable for use as the pile end protection structure of various pile bodies or the improvement of similar structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the implementation structure of the utility model, and part A is framed in the figure.

[0012] Figure 2 is Figure 1 The enlarged schematic diagram of part A of

[0013] Figure 3 It is a partial explosion schematic diagram of the protective hoop of the utility model.

[0014] Figure 4 is Figure 3 The schematic diagram of the usage state of

[0015] Figure 5 is Figure 3 The schematic diagram of the improved scheme of the hoop

[0016] Figure 6 is Figure 5 The schematic diagram of the usage state of

[0017] Figure 7 is Figure 4 The schematic diagram of the improved scheme of

[0018] The numbers and names in the figure are: 1. Anti-pulling pile, 2. Steel strand, 3. Protective hoop, 301. Hoop, 3011. Bending part, 3012. Guard plate, 302. Pulling ring, 303. Support bracket, 3031. Groove, 304. Bolt, 305. Pusher block, 306. Nut, 307. Power cylinder. EMBODIMENTS

[0019] Now, with reference to the accompanying drawings, the utility model will be further described.

[0020] As Figures 1-4As shown in the figure, the anti-cracking structure at the end of the uplift pile is mainly applicable to the end of the uplift pile 1, and several steel strands 2 for uplift test are led out from the end of the uplift pile. The specific end anti-cracking structure is as follows: A protective hoop 3 is sleeved on the peripheral surface of the end of the uplift pile. The protective hoop includes a buckle and an elastically deformable hoop 301. The buckle includes a pull ring 302, a support bracket 303, a bolt 304, a nut 306, and a push block 305. A through hole for threading the bolt is provided in the middle of the support bracket, and a nut groove is provided inside the through hole. The nut is embedded and fixed in the nut groove. One end of the bolt is a screwing operation end, and the screwing operation end is a polygonal head or a polygonal hole. The other end of the bolt is provided with a non-threaded plug-in round head. After the bolt passes through the through hole, the plug-in round head is inserted into a circular jack provided on one side of the push block to form a positioning rotation, and an arc-shaped support surface is formed on the other side of the push block. Hook grooves 3031 for hooking and connecting the pull ring are symmetrically provided on both sides of the support bracket. The above-mentioned hoop is C-shaped and open, and both ends of the hoop are provided with bending parts 3011 for hooking and connecting the pull ring. When the hoop is sleeved on the peripheral surface of the end of the uplift pile, the hook grooves on both sides of the support bracket are connected in tension with the bending parts at both ends of the corresponding hoop through the pull ring. When the bolt is tightened, the hook grooves on both sides of the support bracket and the bending parts at both ends of the hoop are tightened and fixed, that is, the hoop and the end of the uplift pile form a hoop fixation. The arc-shaped support surface of the push block abuts against the side surface of the end of the uplift pile at the C-shaped opening of the hoop when the bolt is tightened to form a support.

[0021] As Figure 5 shown, a guard plate 3012 for supporting the end face of the uplift pile 1 can also be integrally provided at the end of the above-mentioned hoop 301, and the guard plates are distributed in an annular interval array relative to the end face of the hoop. As Figure 6 shown, when the hoop tightens the peripheral surface of the end of the uplift pile, the guard plate forms a tight protection against the end face of the uplift pile.

[0022] As Figure 7 shown, the above-mentioned bolt 304 can also be replaced by a power cylinder 307, that is, the power cylinder is fixed to the support bracket 303, and the end of the push rod of the power cylinder is fixedly or movably connected to the push block 305. Effective tightening operation of the hoop can also be achieved through the power cylinder.

[0023] There are two ways to use the protective hoop. One way is: After the overall assembly of the protective hoop 3, directly put it on the pile end of the anti-pulling pile 1, and then use an external tool to screw the bolt 304 to make the pushing block 305 and the hoop 301 tightly hold the circumferential surface of the pile end of the anti-pulling pile, so as to effectively protect the pile end of the anti-pulling pile. The other way is: Open the C-shaped opening of the hoop and directly radially insert it into the circumferential surface of the pile end from the pile end, then assemble the support bracket 303, bolt 304, nut 306, pull ring 302, and pushing block 305, and then use an external tool to screw the bolt to make the pushing block and the hoop tightly hold the circumferential surface of the pile end of the anti-pulling pile, achieving the same protective function as above. During the above use process, according to the size of the circumferential surface of the pile end, select an appropriate hoop size or pushing block size, so that when the hoop and the pushing block are finally used in combination, the contact area between the arc-shaped support surface of the pushing block and the side surface of the pile end of the anti-pulling pile is not less than half of the area of the C-shaped opening after the hoop holds the circumferential surface of the pile end of the anti-pulling pile, so as to increase the effective protection area of the circumferential surface of the pile end and ensure a better protection effect.

[0024] The above content is intended to illustrate the technical means of the present invention, rather than limiting the protection scope of the present invention. Obvious improvements or replacements made by those skilled in the art to the present invention in combination with the existing common general knowledge also fall within the protection scope of the claims of the present invention.

Claims

1. A pull-out pile end pull-out crack prevention structure, wherein the pull-out pile (1) has a columnar end and leads to a plurality of pull-out test steel strands (2), characterized in that The end of the pull-out pile (1) is sleeved with a protective hoop (3), which comprises a buckle and an elastically deformable hoop (301). The buckle comprises a pull ring (302), a support bracket (303), a bolt (304), and a push block (305). The support bracket is threadedly connected to the bolt in the middle, one end of the bolt is a screwing operation end, and the other end is provided with a positioning and rotating push block. Both sides of the support bracket are provided with hook grooves (3031) for hooking and pulling the pull ring, and the end surface of the push block forms an arc-shaped support surface; the hoop has a C-shaped opening, and the hoop Both ends of the ring are provided with a bent portion (3011) for hooking and connecting the pull ring; when the hoop is sleeved on the circumferential surface of the pull-out pile end, the hook grooves on both sides of the support bracket are connected to the bent portions at both ends of the corresponding hoop through the pull ring, and when the bolt is locked, the hook grooves on both sides of the support bracket are tightened and fixed with the bent portions at both ends of the hoop, that is, the hoop and the pull-out pile end form a clamping fixation, and the arc-shaped supporting surface of the push block is pressed against the side surface of the pull-out pile end at the C-shaped opening of the hoop to form support when the bolt is locked.

2. The pull-out pile end anti-crack structure according to claim 1 is characterized in that The threaded connection between the support bracket (303) and the bolt (304) is replaced by a bolt connection nut (306), and the nut is embedded and fixed in a nut groove on one side of the support bracket.

3. The pull-out pile end anti-crack structure according to claim 1 is characterized in that The bolt (304) and the push block (305) are movably plugged and rotate relative to each other.

4. The pull-out pile end anti-crack structure according to claim 1 is characterized in that The hoop end (301) is integrated with a protective plate (3012) for supporting the end face of the pull-out pile (1), and the protective plates are distributed in a ring-shaped spaced array relative to the hoop end face.

5. The pull-out pile end anti-crack structure according to claim 1 is characterized in that The bolt (304) is replaced by a power cylinder (307), that is, the power cylinder is fixed to the support bracket, and the end of the push rod of the power cylinder is fixedly or movably connected to the push block (305).

6. The pull-out pile end anti-crack structure according to claim 1 is characterized in that The area in which the arc-shaped supporting surface of the push block (305) contacts the side surface of the pile end of the pull-out pile (1) is not less than half the area of ​​the C-shaped opening at the rear of the hoop (301) that holds the circumference of the pile end of the pull-out pile.

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