Cast-in-situ bored pile head pouring structure facilitating compression test

Abstract

The utility model discloses a cast-in-situ bored pile head pouring structure convenient for a compression test, which comprises a steel plate hoop and a cast-in-situ bored pile head, two ends of the steel plate hoop are through, the steel plate hoop is sleeved outside the cast-in-situ bored pile head and is used as a template for pouring the cast-in-situ bored pile head, and a convex top rib is arranged on the periphery of a reinforcement cage of the cast-in-situ bored pile head. The top ribs are used for abutting against the steel plate hoop to keep a gap between the steel plate hoop and the steel cage. When the cast-in-situ bored pile is poured, the steel plate hoop is directly installed on the pile head of the cast-in-situ bored pile, pouring forming of the pressing pile head is carried out at a time, dismounting is not needed after forming, the steel plate hoop is reserved as a reinforcing structure, the procedure of independently constructing a pressing cap in the later period is avoided, the efficiency of a pressing experiment is improved, the pressing experiment time is shortened, and the compression resistance experiment is simplified; and the steel plate hoop also serves as a template for construction, additional template use and construction are reduced, dismounting is not needed, and the dismounting workload of the template is reduced.

Description

Technical Field

[0001] This utility model relates to the field of bored pile head technology, and specifically to a bored pile head casting structure that facilitates compressive strength testing. Background Technology

[0002] In the construction of pile foundations for buildings, it is often necessary to drive bored cast-in-place piles. After driving the bored cast-in-place piles, a compressive strength test needs to be conducted on the pile head. The conventional construction method is to build an integral pressure cap on the top of the bored cast-in-place pile using additional concrete after the pile is poured, and then conduct the compressive strength test. This method involves a separate process, the compressive strength test is cumbersome, and it is necessary to wait for the secondary pressure cap to cure and reach the set strength before the compressive strength test can be carried out, which affects the progress of the compressive strength test. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a convenient pile head casting structure for compressive strength testing, which can shorten the compressive strength testing time and simplify the compressive strength testing process.

[0004] The technical solution adopted in this utility model is as follows: a pile head casting structure for convenient compression testing of bored piles, including a steel plate hoop with open ends and a bored pile head. The steel plate hoop is sleeved on the outside of the bored pile head and serves as its template for casting the bored pile head. The reinforcing cage of the bored pile head is provided with an outwardly protruding top bar around its circumference. The top bar is used to abut against the steel plate hoop so that the steel plate hoop and the steel cage maintain a gap.

[0005] Furthermore, the wall thickness of the aforementioned steel plate hoop is 3-5mm, and the length of the steel plate hoop is 500mm.

[0006] Furthermore, the aforementioned pile head casting structure for convenient compression testing of bored cast-in-place piles also includes stirrups welded around the top of the steel plate hoop, with a steel plate hoop support frame at the bottom of the stirrups. The steel plate hoop support frame rests around the opening of the bored pile hole. The steel plate hoop support frame includes upper semi-circular steel bars, inclined bars, and lower semi-circular steel bars. Two upper semi-circular steel bars are used, which are fixedly connected to two lower semi-circular steel bars by multiple inclined bars to form two semi-circular support frames. The two semi-circular support frames are hinged by two horizontal degrees of freedom through a hinge connection part, and the other free end is fixed by a fixed connection part. The diameter of the circular steel bar formed by the two lower semi-circular steel bars is 20cm larger than the diameter of the bored pile hole, and the diameter of the circular steel bar formed by the two upper semi-circular steel bars is the same as the diameter of the stirrups.

[0007] Furthermore, the aforementioned hinge connection includes a hinge and a connecting plate. The connecting plate consists of two pieces, which are respectively fixed to the vertically corresponding free ends of the two sets of upper and lower semicircular steel bars. The two connecting plates are hinged together by multiple spaced hinges along their length.

[0008] Furthermore, the aforementioned fixed connection part includes bolts, connecting plate two, and connecting ears. Two connecting plates are used, which are respectively fixed to the other free ends of the two sets of upper semi-circular steel bars and lower semi-circular steel bars in the vertical direction. Multiple pairs of connecting ears are used in the length direction of the two connecting plates two, and each pair of connecting ears is fixedly connected by bolts.

[0009] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model directly installs steel plate hoops on the pile head during the casting of bored piles, and the pile head is pressed and formed in one go. After forming, it does not need to be disassembled. The steel plate hoop is retained as a reinforcement structure, avoiding the process of separately constructing the cap later, improving the efficiency of the pressing test, shortening the pressing test time, and simplifying the compressive strength test. Moreover, the steel plate hoop also serves as a formwork, reducing the use and construction of additional formwork, and does not need to be disassembled, thus reducing the workload of formwork disassembly. Attached Figure Description

[0010] Figure 1 A schematic diagram of a drilled pile head casting structure for convenient compression testing;

[0011] Figure 2 This is a front view structural diagram of the steel plate hoop support frame;

[0012] Figure 3 This is a schematic diagram of the rear view of the steel plate hoop support frame.

[0013] Figure 4 This is a top view of the steel plate hoop support frame. Detailed Implementation

[0014] The utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0015] Example 1: As Figures 1-4 As shown, a convenient pile head casting structure for compression testing of bored piles includes a steel plate hoop 1 with open ends and a bored pile head 2. The steel plate hoop 1 is made by bending a steel plate into a cylinder and welding it to form a cylindrical structure with open ends. The steel plate hoop 1 is fitted over the bored pile head 2 and serves as its template for casting the bored pile head 2. The reinforcing cage 201 of the bored pile head 2 is provided with protruding top bars 202 around its circumference. The top bars 202 are used to abut against the steel plate hoop to make the steel plate hoop... The hoop 1 maintains a gap with the steel cage 201. By directly installing the steel plate hoop on the pile head during the casting of the bored pile, the pile head can be pressed and formed in one go. After forming, it does not need to be disassembled. The steel plate hoop is retained as a reinforcement structure, avoiding the process of separately constructing the cap later, improving the efficiency of the pressing test, shortening the pressing test time, and simplifying the compressive strength test. Moreover, the steel plate hoop also serves as a formwork construction, reducing the use and construction of additional formwork. It does not need to be disassembled, reducing the workload of formwork disassembly.

[0016] In order to meet the performance requirements of the pile head for the compression test, the steel plate hoop 1 has a wall thickness of 3-5mm and a length of 500mm.

[0017] To facilitate the suspended installation of the steel plate hoop 1, a pile head casting structure for convenient compression testing of bored cast-in-place piles also includes stirrups 101 welded around the top of the steel plate hoop 1. The bottom of the stirrups 101 abuts against a steel plate hoop support frame 3. The steel plate hoop support frame 3 rests around the opening of the bored pile hole 4. The steel plate hoop support frame, in conjunction with the stirrups, provides support for the steel plate hoop, making installation convenient and quick. Specifically, the steel plate hoop support frame 3 includes an upper semi-circular steel bar 301, inclined bars 302, and a lower semi-circular steel bar 303. Two upper semi-circular steel bars 301 are used, each fixedly connected to two lower semi-circular steel bars 303 by multiple inclined bars 302. The system consists of two semicircular support frames, which are hinged together by two horizontal, one-degree-of-freedom connections via hinge 304. The other free end is fixed via a fixed connection 305. The diameter of the circular steel bar formed by the two lower semicircular steel bars 303 is 20cm larger than the diameter of the bored pile hole 4. The diameter of the circular steel bar formed by the two upper semicircular steel bars 301 is the same as the diameter of the stirrup 101. The system uses the upper semicircular steel bars 301, the inclined steel bars 302, and the lower semicircular steel bars 303 to form a two-half-circular support frame, which is hinged and bolted for fixation. It is easy to assemble and disassemble, convenient to operate, simple in structure, low in cost, and has good support stability.

[0018] To ensure hinge stability, the hinge connection part 304 includes a hinge 306 and a connecting plate 307. Two connecting plates 307 are used, which are respectively fixed to the vertically corresponding free ends of the two sets of upper semicircular steel bars 301 and lower semicircular steel bars 303. The two connecting plates 307 are hinged together by multiple spaced hinges 306 along their length. The connecting plates 307 are welded to the upper semicircular steel bars 301 and lower semicircular steel bars 303. On the one hand, this improves the connection reliability between the upper and lower semicircular steel bars. On the other hand, it also facilitates the installation of the hinges. Using multiple hinges to connect can achieve connection reliability and stability.

[0019] To improve the reliability of the fixation, the fixed connection part 305 includes bolts 308, connecting plate 309, and connecting lugs 310. Two connecting plates 309 are used, which are respectively fixed to the other free ends of the two sets of upper semi-circular steel bars 301 and lower semi-circular steel bars 303 in the vertical direction. Multiple pairs of connecting lugs 310 are used in the length direction of the two connecting plates 309. Each pair of connecting lugs 310 is fixedly connected by bolts 308. The connecting plates are welded to the upper semi-circular steel bars 301 and lower semi-circular steel bars 303. On the one hand, the connection reliability between the upper and lower semi-circular steel bars is improved. On the other hand, it is also convenient to use connecting lugs and bolts for locking and fixing. Using multiple bolts and multiple sets of connecting lugs can achieve connection reliability and stability.

[0020] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A convenient pile head casting structure for compressive strength testing of bored cast-in-place piles, characterized in that: The utility model relates to a steel plate hoop (1) and bored pile head (2) including two ends, the steel plate hoop (1) is sleeved in the bored pile head (2) outside and is used as its formwork to pour the bored pile head (2), the reinforcement cage (201) of the bored pile head (2) is provided with the top bar (202) of the outer convexness in a week, and the top bar (202) is used to abut against the steel plate hoop to make the steel plate hoop (1) with the reinforcement cage (201) keep the gap.

2. The pile head pouring structure of the cast-in-place bored pile facilitating compression test according to claim 1, characterized in that: The wall thickness of the steel plate hoop (1) is 3-5mm, and the length of the steel plate hoop (1) is 500mm.

3. The cast-in-place pile head pouring structure facilitating compression test according to claim 2, characterized in that: The utility model further includes hoop reinforcement (101) welded in a week on the top of the steel plate hoop (1), the bottom of the hoop reinforcement (101) is abutted with the steel plate hoop support frame (3), the steel plate hoop support frame (3) is placed in a week on the opening of the bored pile hole (4), the steel plate hoop support frame (3) includes upper semicircular reinforcement (301), inclined reinforcement (302) and lower semicircular reinforcement (303), the upper semicircular reinforcement (301) is two, is fixedly connected to two lower semicircular reinforcements (303) through a plurality of inclined reinforcements (302) and constitutes two semicircular support frames, the two semicircular support frames are hinged through hinge connecting part (304) with two horizontal degrees of freedom, and the other free end is fixed through fixed connecting part (305), the diameter of the circular reinforcement formed by the two lower semicircular reinforcements (303) is greater than the diameter of the bored pile hole (4) by 20cm, and the diameter of the circular reinforcement formed by the two upper semicircular reinforcements (301) is the same as the diameter of the hoop reinforcement (101).

4. The pile head pouring structure of the cast-in-place bored pile facilitating compression test according to claim 3, characterized in that: The hinge connecting part (304) includes hinge (306) and connecting plate one (307), the connecting plate one (307) is two, is fixed on the vertical corresponding free end of two groups of upper semicircular reinforcement (301) and lower semicircular reinforcement (303), and the length direction of the two connecting plate ones (307) is hinged through a plurality of interval arranged hinges (306).

5. The cast-in-place pile head pouring structure facilitating compression test according to claim 4, characterized in that: The fixed connecting part (305) includes bolt (308), connecting plate two (309) and connecting lug (310), the connecting plate two (309) is two, is fixed on the vertical corresponding other free end of two groups of upper semicircular reinforcement (301) and lower semicircular reinforcement (303), and the length direction of the two connecting plate twos (309) is fixedly connected through a plurality of connecting lug (310) of each pair, and each pair of connecting lug (310) is fixedly connected through bolt (308).

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