Pile head lock for single-pile vertical uplift static load test

Abstract

The utility model discloses a pile head lock for a single-pile vertical uplift static load test. The pile head lock comprises a lock shell with an upper opening and a lower opening. The upper clamping pieces are evenly distributed in the circumferential direction of the same height of the inner side wall of the lock shell. One end of each upper clamping piece is hinged to the inner side wall of the lock shell, the upper clamping pieces have preset lengths, and when the pile head lock moves downwards to be arranged on the pile head of the foundation pile in a sleeving mode, the other ends of the multiple upper clamping pieces make contact with the outer wall of the foundation pile at the same time and swing upwards, so that upward inclined supporting on the foundation pile is formed; the lower clamping pieces are located below the upper clamping pieces and evenly distributed in the circumferential direction of the same height of the wall body of the lock shell. Each lower clamping piece is horizontally arranged on the wall body of the lock shell in a penetrating manner in a threaded connection manner, so that one end of each lower clamping piece can be close to and abut against the outer wall of the foundation pile to form horizontal support and far away from the outer wall; and the plurality of pairs of hanging rings are uniformly distributed at the top of the lock shell. The device is convenient to install, the test pile can be clamped and stabilized conveniently, and the efficiency of the single-pile vertical anti-pulling static load test is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of test tools for foundation engineering, and more specifically, the utility model relates to a pile head lock for single-pile vertical uplift static load test. Background Art

[0002] The static load test is currently recognized as the most direct and reliable test method for detecting the vertical compressive (tensile) bearing capacity of foundation piles. For most of the existing single-pile vertical uplift static load test devices, the steel bars on the test pile are connected to the reaction platform. Since the steel bars on the test pile do not have threads, they cannot be directly fixed to the reaction platform through nuts. It is necessary to first roll the thread head at one end of the steel bar using a threading machine or fix the steel bar to the reaction platform by welding. The above two methods are time-consuming and laborious, greatly limiting the efficiency of the single-pile vertical uplift static load test.

[0003] In this regard, the prior art discloses a single-pile vertical uplift static load test device (publication number CN207392272U), in which the upper end of the clamping rod is rotatably connected to the inner wall of the opening of the support platform, the lower end of the clamping rod is connected to the clamping plate, and the vertical pull rod is rotatably connected to the middle of the clamping rod. When the pull rod is vertically lifted, the clamping plate on the clamping rod can be driven to approach the test pile to achieve clamping and fixing. However, since the pull rods on each clamping rod are lifted synchronously and the lifted height is the same, the distance that the clamping plate moves towards the test pile is the same. If the distances between the multiple clamping plates around the test pile and the test pile are different when installing the test device, the clamping plate with a small distance has already contacted and pressed against the test pile, while the clamping plate with a large distance has not contacted the test pile, resulting in uneven force on the test pile and even bending the test pile, affecting the effect of the static load test. And in the actual construction process, it is very difficult to make the distances between the multiple hanging clamping plates around the test pile and the test pile equal.

[0004] Therefore, it is urgent to solve the above defects and problems of the prior art to facilitate the use of the single-pile vertical uplift static load test. Summary of the Utility Model

[0005] An object of the utility model is to solve at least the above defects and provide at least the advantages described later.

[0006] Another object of the utility model is to provide a pile head lock for single-pile vertical uplift static load test, which is provided with an upper clamping member and a lower clamping member on the inner side wall of the lock housing with upper and lower openings, facilitating clamping and stabilizing the test pile, and then continuing the lifting and detection, and is convenient to install, effectively improving the efficiency of the single-pile vertical uplift static load test.

[0007] The utility model provides a pile head lock for single-pile vertical uplift static load test, which comprises:

[0008] The lock housing is a box or barrel body with openings at both the top and bottom;

[0009] A plurality of upper clamping members are evenly distributed circumferentially at the same height on the inner side wall of the lock housing; one end of each upper clamping member is hinged to the inner side wall of the lock housing, and the upper clamping member has a preset length. When the pile head lock moves downward to sleeved the pile head of the foundation pile, the other ends of the plurality of upper clamping members simultaneously touch the outer wall of the foundation pile and swing upward to form an upward inclined support for the foundation pile;

[0010] A plurality of lower clamping members are located below the plurality of upper clamping members and are evenly distributed circumferentially at the same height on the wall of the lock housing; each lower clamping member is horizontally penetrated through the wall of the lock housing and is threadedly connected to the wall of the lock housing, so that one end of the lower clamping member can approach and press against the outer wall of the foundation pile to form a horizontal support and move away from the outer wall of the foundation pile;

[0011] A plurality of pairs of lifting rings are evenly distributed on the top of the lock housing.

[0012] Preferably, the preset length is specifically designed as follows: when the pile head of the pile foundation is located in the middle of the pile head lock, the other ends of the plurality of upper clamping members simultaneously touch the outer wall of the foundation pile, and the angle between the upper clamping member and the horizontal plane is 30° - 45°.

[0013] Preferably, when the other ends of the plurality of upper clamping members do not contact the pile foundation, the plurality of upper clamping members remain in a horizontal state, and the diameter of the circle formed by the other ends of the plurality of upper clamping members inside the lock housing is smaller than the diameter of the pile head of the pile foundation. When the pile head lock is lowered, the pile foundation is aligned through the formed circle, which is conducive to controlling the pile head of the pile foundation to be in the middle of the pile head lock.

[0014] Preferably, the upper clamping member includes a support seat, a support seat shaft, a support rod, a first lock nail seat, a first lock nail seat shaft, a first lock nail plate, and a first lock nail;

[0015] The support seat is a U-shaped plate body composed of a bottom plate and two side plates. The support seat shaft is penetrated through the two side plates. One end of the support rod is rotatably connected to the support seat through the support seat shaft, and the support seat is fixedly arranged on the inner wall of the lock housing in a manner that its bottom plate is perpendicular to the inner wall of the lock housing;

[0016] The other end of the support rod is connected to the first lock nail seat. The first lock nail seat is rotatably connected to the support rod through the first lock nail seat shaft. The distal end of the first lock nail seat is connected to one surface of the first lock nail plate, and the other surface of the first lock nail plate is provided with a first lock nail.

[0017] Preferably, the other surface of the first lock nail plate is an arc surface adapted to the outer wall of the pile foundation; the first lock nail seat includes two plate bodies, and the first lock nail seat shaft is penetrated through the two plate bodies.

[0018] Preferably, the lower clamp includes a locking pin bolt, a second locking pin seat and a second locking pin; the locking pin bolt is horizontally passed through the wall of the lock housing and is threadedly connected to the wall of the lock housing; a circular sliding groove is provided on one surface of the second locking pin seat; a circular slider matching the circular sliding groove is provided at the tail of the locking pin bolt, so that the circular slider can be rotatably clamped in the circular sliding groove;

[0019] The other surface of the second locking nail seat is an arcuate surface adapted to the outer wall of the pile foundation, and the second locking nail is arranged on the arcuate surface.

[0020] Preferably, the lock housing is a square box or a round barrel with upper and lower openings.

[0021] Preferably, the lock housing is a square box with upper and lower openings, four upper clamps are provided, four lower clamps are provided, the lower clamps are located directly below the upper clamps, and the four upper clamps are respectively provided at the four corners of the square box.

[0022] The utility model has at least the following beneficial effects:

[0023] First, the pile head lock designed by the present invention facilitates multiple upper clamps and multiple lower clamps to press against the outer wall of the foundation pile at the same time, providing a better clamping and pulling effect on the foundation pile, and the pile head lock and the foundation pile head are installed more simply and quickly using a sleeve method, thereby improving the efficiency of the single pile vertical pull-out static load test.

[0024] Secondly, the support seat of the upper clamp of the present invention is fixed to the inner wall of the lock shell in such a way that its bottom plate is perpendicular to the inner wall of the lock shell, so that the support rod can rotate around the support seat axis on the support seat opening, while the support rod can remain horizontal in the free state, so that the circle surrounded by the first locking nail plate connected to the other end of the support rod is used to align with the pile foundation to lower the pile head lock of the present invention, which is beneficial to control the pile foundation pile head to be in the middle of the pile head lock.

[0025] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of an implementation form of the pile head lock for a single pile vertical pullout static load test according to the present invention;

[0027] Figure 2 This is a schematic top view of the pile head lock for a single pile vertical pullout static load test according to the present invention;

[0028] Figure 3The top view structural schematic diagram of another implementation form of the pile head lock for the single-pile vertical uplift static load test described in the present utility model;

[0029] Figure 4 The top view structural schematic diagram of the third implementation form of the pile head lock for the single-pile vertical uplift static load test described in the present utility model.

[0030] Wherein: the lock housing 1; the test pile 2; the lifting ring 3; the first locking pin 4; the first locking pin seat 5; the first locking pin seat shaft 6; the support rod 7; the support seat 8; the support seat shaft 9; the upper clamp 10; the locking pin bolt 11; the bolt head 12; the second locking pin seat 13; the second locking pin 14; the lower clamp 15; the first locking pin plate 16; the steel strand 17. Specific embodiments

[0031] The following further describes the present utility model in detail with reference to embodiments, so that those skilled in the art can implement it according to the description in the specification.

[0032] It should be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial channels unless otherwise specified; in the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "setting" should be understood in a broad sense. For example, they can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. The orientation or positional relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0033] As Figure 1-2 shown, the present utility model discloses a pile head lock for a single-pile vertical uplift static load test, which includes:

[0034] The lock housing 1, which is a box or barrel body with openings at both the upper and lower ends;

[0035] A plurality of upper clamps 10, which are evenly distributed circumferentially at the same height on the inner side wall of the lock housing 1; one end of each upper clamp 10 is hinged to the inner side wall of the lock housing 1, and the upper clamp 10 has a preset length. When the pile head lock moves downward to sleeved the pile head of the foundation pile, the other ends of the plurality of upper clamps 10 simultaneously touch the outer wall of the foundation pile and swing upward to form an upward inclined support for the foundation pile;

[0036] Multiple lower clamps 15 are located below the multiple upper clamps 10 and are evenly distributed around the wall of the lock housing 1 at the same height. Each lower clamp 15 is horizontally inserted into the wall of the lock housing 1 and is threadedly connected to the wall of the lock housing 1, so that one end of the lower clamp 15 can be close to the outer wall of the pile to form a horizontal support, and away from the outer wall of the pile to facilitate the pile head lock to be sleeved on the pile.

[0037] Multiple pairs of lifting rings 3 are evenly distributed on the top of the lock housing 1, and are used to connect the reaction platform or reaction beam to provide lifting force to the pile head lock and the foundation pile head. In actual application, it is better to set two or four pairs of lifting rings 3. Figure 2 There are two pairs of lifting rings 3 shown in the figure, each pair of lifting rings 3 consists of two lifting rings 3, and there are four lifting rings 3 in total in the two pairs of lifting rings 3, which are evenly distributed on the four corners of the square lock housing 1. Each pair of lifting rings 3 is connected to a steel strand 17, and the reaction platform or reaction beam is passed through the steel strand 17 of each pair of lifting rings 3, and prestressing is performed. At the same time, the length of each steel strand 17 is adjusted to reach the prestressed state, and then fastened to the reaction platform or reaction beam, and then continued to pull, so that the foundation pile is better clamped and pulled, thereby improving the effect of the single pile vertical pull-out static load test.

[0038] The implementation process of the present invention is to set an upper clamp 10 with an upward oblique support and a lower clamp 15 with a horizontal support on the inner side wall of the lock shell 1 with upper and lower openings. When a vertical pull-out static load test of a single pile is required, the soil layer around the upper part of a test pile 2 (also called an engineering foundation pile) is dug and leveled to expose the pile head. Then, the pile head lock of the present invention is put on the exposed pile head of the engineering foundation pile. Since one end of the upper clamp 10 is hinged to the inner side wall of the lock shell 1 and has a preset length, the other ends of multiple upper clamps 10 simultaneously touch the outer wall of the engineering foundation pile and swing upward, so that the multiple upper clamps 10 form an upward oblique support around the circumference of the engineering foundation pile. Multiple lower clamps 15 are horizontally inserted into the wall of the lock shell 1 and are threadedly connected to the wall of the lock shell 1. Before the pile head lock is moved down to be put on the pile head, one end of the multiple lower clamps 15 is first moved away from the outer wall of the pile to facilitate the pile head lock to be put on the pile. After the pile head lock is lowered and installed on the pile head (the pile head is basically located in the middle of the pile head lock, and the other ends of the multiple upper clamps 10 touch the outer wall of the pile at the same time), and it is placed stably on the ground at the pile head, one end of the multiple lower clamps 15 is then pressed against the outer wall of the pile to form a horizontal support, so that the pile can be better clamped and lifted, providing a basis for obtaining uniform and stable force for the subsequent vertical pull-out static load test of the pile.

[0039] The pile head lock designed by the present invention can facilitate multiple upper clamps 10 and multiple lower clamps 15 to press against the outer wall of the foundation pile at the same time, providing a better clamping and lifting effect on the foundation pile, and the pile head lock and the pile head are installed more conveniently and quickly using a sleeve installation method, thereby improving the efficiency of the single pile vertical pull-out static load test.

[0040] Based on the above implementation form, the preset length is specifically designed as follows: when the pile head of the pile foundation is located in the middle of the pile head lock, the other ends of multiple upper clamps 10 touch the outer wall of the foundation pile at the same time, and the angle between the upper clamps 10 and the horizontal plane is 30°~45°.

[0041] On the basis of the above-mentioned implementation form, when the other ends of the multiple upper clamps 10 do not contact the pile foundation, the multiple upper clamps 10 remain in a horizontal state, and the diameter of the circle formed by the other ends of the multiple upper clamps 10 in the lock housing 1 is smaller than the diameter of the pile head of the pile foundation. When the pile head lock is lowered, the pile foundation is aligned with the formed circle, which is conducive to controlling the pile foundation head to be in the middle of the pile head lock.

[0042] On the basis of the above implementation form, the upper clamp 10 includes a support seat 8, a support seat shaft 9, a support rod 7, a first locking nail seat 5, a first locking nail seat shaft 6, a first locking nail plate 16 and a first locking nail 4;

[0043] The support base 8 is a "凵"-shaped plate body, which is composed of a bottom plate and two side plates. The support base shaft 9 is penetrated by the two side plates. One end of the support rod 7 is rotatably connected to the support base 8 through the support base shaft 9. The support base 8 is fixed to the inner wall of the lock housing 1 in a manner that its bottom plate is perpendicular to the inner wall of the lock housing 1, so that the support rod 7 can rotate around the support base shaft 9 on the opening of the support base 8. The bottom plate of the support base 8 is horizontally arranged so that the support rod 7 can remain horizontal in the free state;

[0044] The other end of the support rod 7 is connected to the first locking nail seat 5, and the first locking nail seat 5 is rotatably connected to the support rod 7 through the first locking nail seat shaft 6. The distal end of the first locking nail seat 5 is connected to one surface of the first locking nail plate 16, and the other surface of the first locking nail plate 16 is provided with a first locking nail 4. The first locking nail 4 is used to gradually tighten the foundation pile by friction with the surface of the foundation pile body.

[0045] Based on the above implementation form, the other surface of the first locking nail plate 16 is an arc-shaped surface adapted to the outer wall of the pile foundation; the first locking nail seat 5 includes two plate bodies, and the first locking nail seat shaft 6 is passed through the two plate bodies, so that the first locking nail seat 5 is rotatably connected to the support rod 7 through the first locking nail seat shaft 6.

[0046] On the basis of the above implementation form, the lower clamp 15 includes a locking bolt 11, a second locking nail seat 13 and a second locking nail 14; the locking bolt 11 is horizontally penetrated on the wall of the lock housing 1 and is threadedly connected to the wall of the lock housing 1, and a circular slide groove is provided on one surface of the second locking nail seat 13, and a circular slider matching the circular slide groove is provided at the tail of the locking bolt 11, so that the circular slider can be rotatably clamped in the circular slide groove, so that the locking bolt 11 is perpendicular to one surface of the second locking nail seat 13 and can rotate freely;

[0047] The other side of the second locking pin seat 13 is an arcuate surface adapted to the outer wall of the pile foundation. The second locking pin 14 is mounted on the arcuate surface. The second locking pin 14 is used to enhance the frictional locking effect on the surface of the pile foundation. The bolt head 12 of the locking pin bolt 11 is typically a hexagonal head to facilitate the control of the rotation operation.

[0048] On the basis of the above implementation, the lock housing 1 is a square box or a round barrel with upper and lower openings.

[0049] On the basis of the above implementation, another implementation is as follows: the lock housing 1 is a square box with upper and lower openings, four upper clamps 10 are provided, and four lower clamps 15 are provided. The lower clamps 15 are located directly below the upper clamps 10 ( Figure 2 The lower clamp 15 is basically blocked by the upper clamp 10, so Figure 2 The lower clamp 15 is not shown in the figure, and the four upper clamps 10 are respectively arranged on the four corners of the square box to improve the connection strength.

[0050] On the basis of the above implementation, another implementation is as follows: the lock housing 1 is a square box with upper and lower openings, four upper clamps 10 are provided, and the four upper clamps 10 are respectively provided on the four corners of the square box, and two lower clamps 15 are provided, and the two lower clamps 15 are provided on the opposite side walls of the square box. Figure 3 shown.

[0051] On the basis of the above implementation, another implementation is: the lock housing 1 is a circular barrel with upper and lower openings, three upper clamps 10 are provided, and three lower clamps 15 are provided. The lower clamps 15 are located directly below the upper clamps 10 ( Figure 4 The lower clamping piece 15 is not shown in the figure, and the three upper clamping pieces 10 are evenly distributed on the inner wall of the circular barrel to improve the connection strength.

[0052] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiment. They can be applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized.

Claims

1. The pile head locking device for vertical uplift static load test of single pile is characterized in that, Including: A lock housing, which is a box or barrel body with openings at both the top and bottom; A plurality of upper clamping members, which are evenly distributed circumferentially at the same height on the inner side wall of the lock housing; one end of each upper clamping member is hinged to the inner side wall of the lock housing, and the upper clamping member has a preset length. When the pile head lock moves downward to sleeved the pile head of the foundation pile, the other ends of the plurality of upper clamping members simultaneously touch the outer wall of the foundation pile and swing upward to form an upward inclined support for the foundation pile; A plurality of lower clamping members, which are located below the plurality of upper clamping members and are evenly distributed circumferentially at the same height on the wall body of the lock housing; each lower clamping member is horizontally penetrated through the wall body of the lock housing and is threadedly connected to the wall body of the lock housing, so that one end of the lower clamping member can approach and press against the outer wall of the foundation pile to form a horizontal support, and move away from the outer wall of the foundation pile; Multiple pairs of lifting rings, which are evenly distributed on the top of the lock housing.

2. The pile head locking device for the vertical uplift static load test of a single pile according to claim 1, wherein The preset length is specifically designed as follows: when the pile head of the pile foundation is located in the middle of the pile head lock, the other ends of the plurality of upper clamping members simultaneously touch the outer wall of the foundation pile, and the included angle between the upper clamping member and the horizontal plane is 30° - 45°.

3. The pile head locking device for the vertical uplift static load test of a single pile according to claim 1, characterized in that, When the other ends of the plurality of upper clamping members do not contact the pile foundation, the plurality of upper clamping members remain in a horizontal state, and the diameter of the circle formed by the other ends of the plurality of upper clamping members inside the lock housing is smaller than the diameter of the pile head of the pile foundation.

4. The pile head locking device for the vertical uplift static load test of a single pile according to any one of claims 1-3, characterized in that, The upper clamping member includes a support seat, a support seat shaft, a support rod, a first lock seat, a first lock seat shaft, a first lock plate and a first lock; The support seat is a U-shaped plate body, which is composed of a bottom plate and two side plates. The support seat shaft is penetrated through the two side plates thereof. One end of the support rod is rotatably connected to the support seat through the support seat shaft, and the support seat is fixedly arranged on the inner wall of the lock housing in such a way that its bottom plate is perpendicular to the inner wall of the lock housing; The other end of the support rod is connected to the first lock seat. The first lock seat is rotatably connected to the support rod through the first lock seat shaft. The distal end of the first lock seat is connected to one surface of the first lock plate, and a first lock is arranged on the other surface of the first lock plate.

5. The pile head locking device for the single-pile vertical uplift static load test according to claim 4, characterized in that, The other surface of the first lock plate is an arc surface adapted to the outer wall of the pile foundation; the first lock seat includes two plate bodies, and the first lock seat shaft is penetrated through the two plate bodies.

6. The pile head locking device for the single-pile vertical uplift static load test according to any one of claims 1-3 or 5, characterized in that, The lower clamping member includes a lock bolt, a second lock seat and a second lock; the lock bolt is horizontally penetrated through the wall body of the lock housing and is threadedly connected to the wall body of the lock housing. A circular chute is arranged on one surface of the second lock seat, and a circular slider matching the circular chute is arranged at the tail of the lock bolt, so that the circular slider can be rotatably clamped in the circular chute; The other surface of the second lock seat is an arc surface adapted to the outer wall of the pile foundation, and a second lock is arranged on the arc surface.

7. The pile head locking device for the vertical uplift static load test of a single pile according to claim 6, characterized in that, The lock housing is a square box or a circular barrel body with openings at both the top and bottom.

8. The pile head locking device for the single-pile vertical uplift static load test according to claim 7, characterized in that, The lock housing is a square box with openings at both the top and bottom. Four upper clamping members are provided, and four lower clamping members are provided. The lower clamping members are located directly below the upper clamping members, and the four upper clamping members are respectively arranged at the four corners of the square box.

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