A reaction force device for uplift detection of foundation piles

Abstract

The present invention discloses a reaction force device for the uplift detection of foundation piles, which includes a first reaction beam, a second reaction beam, a first main beam, a second main beam, a first jack, a second jack, a third jack, a fourth jack and a locking component; the first reaction beam and the second reaction beam are arranged parallel to each other at intervals on the surface of the foundation, and the first main beam and the second main beam are arranged across above the first reaction beam and the second reaction beam; the foundation pile to be tested is buried in the foundation, and the main reinforcement exposed at the top of the foundation pile to be tested is fixed to the first main beam and the second main beam through the locking component; a first jack is installed at the cross-junction of the first main beam and the first reaction beam, a second jack is installed at the cross-junction of the first main beam and the second reaction beam, a third jack is installed at the cross-junction of the second main beam and the first reaction beam, and a fourth jack is installed at the cross-junction of the second main beam and the second reaction beam. The structure of the present invention is simple and the cost is low, and a load of 2000 tons can be achieved through on-site tests.

Description

Technical Field

[0001] The present invention relates to the field of building foundation piles, and more specifically to an anti-pulling detection reaction force device for foundation piles. Background Art

[0002] With the progress and development of society, the country has higher and higher requirements for building quality. In modern construction projects, the height of buildings is getting higher and higher, the volume is getting larger and larger, and the requirements for the bearing capacity of foundation piles are getting higher and higher. Therefore, it is of great significance to conduct anti-pulling detection on foundation piles.

[0003] The anti-pulling detection of foundation piles is to apply an upward vertical force to the foundation piles and observe the uplift displacement generated by the whole foundation piles within a certain period of time to determine the load capacity of the foundation piles.

[0004] At present, the foundation pile anti-pulling detection devices used in the market have a detection load of less than 1000 tons, and the installation is relatively cumbersome and the cost is high. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an anti-pulling detection reaction force device for foundation piles.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] An anti-pulling detection reaction force device for foundation piles includes a first reaction beam, a second reaction beam, a first main beam, a second main beam, a first jack, a second jack, a third jack, a fourth jack and a locking component; the first reaction beam and the second reaction beam are arranged in parallel at intervals on the surface of the foundation; the first main beam and the second main beam are arranged across above the first reaction beam and the second reaction beam, and the first main beam and the second main beam are arranged in parallel at intervals; the foundation pile to be tested is buried in the foundation, and the main reinforcement bars exposed at the top of the foundation pile to be tested are fixed on the first main beam and the second main beam through the locking component; the first jack is installed at the cross-junction of the first main beam and the first reaction beam, the second jack is installed at the cross-junction of the first main beam and the second reaction beam, the third jack is installed at the cross-junction of the second main beam and the first reaction beam, and the fourth jack is installed at the cross-junction of the second main beam and the second reaction beam.

[0008] A further technical solution of it is that the first jack, the second jack, the third jack and the fourth jack have the same model.

[0009] A further technical solution of it is that it further includes a first reaction support and a second reaction support; the first reaction support is located between the foundation and the first jack and the third jack, and the second reaction support is located between the foundation and the second jack and the fourth jack.

[0010] Its further technical solution is as follows: The pile to be tested is located at the central position of the interval area between the first reaction beam and the second reaction beam, and the interval distance between the first reaction beam and the second reaction beam is 8-10 times the diameter of the pile to be tested.

[0011] Its further technical solution is as follows: The interval distance between the first reaction beam and the second reaction beam is greater than 4m.

[0012] Its further technical solution is as follows: The locking assembly includes a plurality of locking plates and a plurality of locking devices; the plurality of locking plates are arranged across the first main beam and the second main beam, and an interval space for the main reinforcement of the pile to be tested to pass through is reserved between two adjacent locking plates. The upper end of the main reinforcement of the pile to be tested passes through the interval space to protrude above the locking plate and is locked by the locking device.

[0013] Its further technical solution is as follows: The locking device includes a steel ring and at least two clamping pieces; the cross-section of the steel ring is in a trapezoidal shape with a wider upper part and a narrower lower part. The steel ring is sleeved on the upper end of the main reinforcement of the pile to be tested, and its bottom is closely attached to the top of the locking plate. The clamping pieces are embedded in the steel ring and wrap the main reinforcement of the pile to be tested.

[0014] Its further technical solution is as follows: The plurality of locking plates are arranged in a side-standing manner.

[0015] Its further technical solution is as follows: The locking plate is made of high-strength steel plate.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: The present invention is designed with two reaction beams, two main beams, and four jacks. The two reaction beams are arranged in parallel at intervals, the two main beams are arranged across the two reaction beams, and the four jacks are installed at the overlapping positions of the two reaction beams and the two main beams, thus forming a stable structure. The main reinforcement exposed at the top of the pile to be tested is fixed to the two main beams through the locking assembly. When hydraulic pressure is applied to the jacks, the jacks transfer the force to the main beams and the reaction beams. The reaction beam at the bottom of the jack transfers the force to the hard foundation, and the main beam at the top of the jack applies a vertically upward pulling force to the pile to be tested. Therefore, the friction limit value of the pile to be tested can be measured by obtaining the hydraulic pressure data of the jacks and verifying whether the pile body characteristic value meets the design requirements. Since four symmetrically arranged jacks are used, the stability of force transfer is increased and the detection load is increased. This device can reach a load of 2000 tons through on-site tests.

[0017] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following preferred embodiments are specifically described in detail as follows. Brief Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a plan view of a specific embodiment of a reaction force device for pile uplift detection according to the present invention;

[0020] Figure 2 It is an elevation view of a specific embodiment of a reaction force device for pile uplift detection according to the present invention;

[0021] Figure 3 It is a schematic structural view of a locking device in a specific embodiment of a reaction force device for pile uplift detection according to the present invention.

[0022] Reference numerals

[0023] 1. First reaction force beam; 2. Second reaction force beam; 3. First main beam; 4. Second main beam; 5. First jack; 6. Second jack; 7. Third jack; 8. Fourth jack; 9. Locking assembly; 91. Locking plate; 92. Locking device; 921. Steel ring; 922. Wedge; 10. First reaction force support; 11. Second reaction force support; 100. Foundation; 200. Main reinforcement. Specific embodiments

[0024] The following will clearly and completely describe the technical solutions of the present invention in combination with specific embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] It should be understood that when used in this specification and the claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0026] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0027] It should also be further understood that the term "and / or" used in the specification and appended claims of the present invention refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] The present invention provides a reaction force device for uplift detection of foundation piles. Please refer to Figure 1 、 2 . The device includes a first reaction force beam 1, a second reaction force beam 2, a first main beam 3, a second main beam 4, a first jack 5, a second jack 6, a third jack 7, a fourth jack 8 and a locking assembly 9. The first reaction force beam 1 and the second reaction force beam 2 are arranged parallel to each other and spaced apart on the surface of the foundation 100. The first main beam 3 and the second main beam 4 are arranged across above the first reaction force beam 1 and the second reaction force beam 2, and the first main beam 3 and the second main beam 4 are kept parallel and spaced apart. The foundation pile to be tested is buried in the foundation 100, and the main reinforcement bars 200 exposed at the top of the foundation pile to be tested (not shown in the figure) are fixed to the first main beam 3 and the second main beam 4 through the locking assembly 9. A first jack 5 is installed at the junction of the first main beam 3 and the first reaction force beam 1, a second jack 6 is installed at the junction of the first main beam 3 and the second reaction force beam 2, a third jack 7 is installed at the junction of the second main beam 4 and the first reaction force beam 1, and a fourth jack 8 is installed at the junction of the second main beam 4 and the second reaction force beam 2.

[0029] Specifically, after the four jacks are installed, they are in a pairwise symmetric position relationship. In order to meet the requirement of uniform force, preferably, the first jack 5, the second jack 6, the third jack 7 and the fourth jack 8 are of the same model. It is precisely because four symmetrically arranged jacks are adopted that the stability of force transmission is increased and the detection load is increased. This device can reach a load of 2000 tons through on-site tests. In addition, the arrangement of the two reaction force beams and the two main beams constitutes a stable structure, making the device more stable during operation.

[0030] In order to ensure the stability of force application and force transmission and comply with the provisions of the Technical Code for Building Foundation Pile Testing JGJ106 - 2014, the spacing distance between the first main beam 3 and the second main beam 4 is less than the spacing distance between the first reaction force beam 1 and the second reaction force beam 2. The foundation pile to be tested is located at the central position of the spacing area between the first reaction force beam 1 and the second reaction force beam 2. The spacing distance between the first reaction force beam 1 and the second reaction force beam 2 is 8 - 10 times the diameter of the foundation pile to be tested, and the spacing distance between the first reaction force beam 1 and the second reaction force beam 2 is greater than 4m.

[0031] In some embodiments, such as in this embodiment, please refer to Figure 2, the device further includes a first reaction support 100 and a second reaction support 200; the first reaction support 100 is located between the foundation 100 and the first jack 5 and the third jack 7, and the second reaction support 200 is located between the foundation 100 and the second jack 6 and the fourth jack 8. The provided brackets can prevent the jacks from tilting and ensure the stability of the jacks during operation.

[0032] Further, please refer to Figure 2 , 3 , the locking assembly 9 includes a plurality of locking plates 91 and a plurality of locking devices 92; the plurality of locking plates 91 are arranged across the first main beam 3 and the second main beam 4, and an interval space for the main reinforcement 200 of the pile under test to pass through is reserved between two adjacent locking plates 91. The upper end of the main reinforcement 200 of the pile under test passes through the interval space to protrude above the locking plate 91 and is locked by the locking device 92. The locking device 92 includes a steel ring 921 and at least two clamping pieces 922. The cross-section of the steel ring 921 is in a trapezoidal shape with a wider upper part and a narrower lower part. The steel ring 921 is sleeved on the upper end of the main reinforcement 200 of the pile under test, and its bottom is closely attached to the top of the locking plate 91. The clamping pieces 922 are embedded in the steel ring 921 and wrap the main reinforcement 200 of the pile under test. During use, the steel ring 921 is sleeved on the main reinforcement 200, and the clamping pieces 922 are stuck between the main reinforcement 200 and the steel ring 921. When the jack works, the main reinforcement 200 will be subjected to a downward pulling force under the action of the pile under test. Therefore, the clamping pieces 922 will naturally be tightly stuck between the main reinforcement 200 and the steel ring 921 to lock the main reinforcement 200. Of course, existing technical means can also be used to lock the main reinforcement 200 on the main beam, but preferably, the structure of the cooperation between the steel ring 921 and the clamping pieces 922 of the present invention is used for locking. This method is not only more convenient for on-site operation but also has a low cost.

[0033] Preferably, the plurality of locking plates 91 are arranged in a side-standing manner. Such an arrangement can not only facilitate locking the main reinforcement 200 exposed at the top of the pile under test but also has higher support strength. In this embodiment, HC420LA high-strength steel is selected as the locking plate 91.

[0034] In some embodiments, since the bottom of the jack must be kept flat during installation, a level is provided on both the first reaction support and the second reaction support. By observing the level situation, it can be determined whether the first reaction support and the second reaction support are leveled. Moreover, the level can be directly observed by the human eye without other auxiliary equipment, which makes it more efficient and convenient to adjust the entire device, and the level has the advantage of low cost.

[0035] In some embodiments, the first reaction support and the second reaction support are adjustable structures. That is, four threaded holes are provided at the four corners of the reaction support. Adjusting screws are installed in the threaded holes. A support plate is welded to the bottom of the adjusting screw, and a rotating handle is welded to the top of the adjusting screw. The angle of the reaction support can be adjusted by rotating the rotating handle. This adjustable structure is mainly applicable to the situation where the foundation is uneven or cannot be leveled.

[0036] In this embodiment, two jacks share one reaction support. Then, in other embodiments, one jack can also use one reaction support alone. That is, four jacks require four reaction supports. The advantage of this design is that it is convenient to move and easy to store, and the occupied space is relatively small when stored.

[0037] The working principle of this device is as follows:

[0038] After the device is adjusted and installed, apply hydraulic pressure to the jack. The jack transfers the force to the main beam and the reaction beam. The reaction beam at the bottom of the jack transfers the force to the hard foundation through the reaction support. The main beam at the top of the jack applies a vertically upward pulling force to the inspected foundation pile. Thus, the friction limit value of the inspected foundation pile can be measured by obtaining the hydraulic pressure data of the jack, and it can be verified whether the pile body characteristic value meets the design requirements. It should be noted that how to obtain the hydraulic pressure data of the jack is prior art, and the data acquisition process will not be elaborated here.

[0039] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An anti-pulling test reaction device for foundation piles, characterized in that It includes a first reaction beam, a second reaction beam, a first main beam, a second main beam, a first jack, a second jack, a third jack, a fourth jack and a locking assembly; the first reaction beam and the second reaction beam are arranged parallel to each other and spaced apart left and right on the surface of the foundation, the first main beam and the second main beam are arranged across above the first reaction beam and the second reaction beam, and the first main beam and the second main beam are kept parallel and spaced apart; the pile to be tested is embedded in the foundation, and the main reinforcement bars exposed at the top of the pile to be tested are fixed to the first main beam and the second main beam through the locking assembly; the first jack is installed at the cross-junction of the first main beam and the first reaction beam, the second jack is installed at the cross-junction of the first main beam and the second reaction beam, the third jack is installed at the cross-junction of the second main beam and the first reaction beam, and the fourth jack is installed at the cross-junction of the second main beam and the second reaction beam; it further includes a first reaction support and a second reaction support; the first reaction support is located between the foundation and the first jack and the third jack, and the second reaction support is located between the foundation and the second jack and the fourth jack; the spacing distance between the first main beam and the second main beam is less than the spacing distance between the first reaction beam and the second reaction beam.

2. The reaction force device for uplift detection of a foundation pile according to claim 1, characterized in that, The first jack, the second jack, the third jack and the fourth jack are of the same model.

3. The reaction force device for uplift detection of foundation piles according to claim 1, characterized in that, The pile to be tested is located at the central position of the spacing area between the first reaction beam and the second reaction beam, and the spacing distance between the first reaction beam and the second reaction beam is 8-10 times the diameter of the pile to be tested.

4. The anti-pulling detection reaction force device for foundation piles according to claim 3, characterized in that, The spacing distance between the first reaction beam and the second reaction beam is greater than 4m.

5. A reaction force device for pile uplift detection according to any one of claims 1-4, characterized in that, The locking assembly includes a plurality of locking plates and a plurality of locking tools; the plurality of locking plates are arranged across the first main beam and the second main beam, and an interval space for the main reinforcement bars of the pile to be tested to pass through is reserved between adjacent two locking plates, and the upper ends of the main reinforcement bars of the pile to be tested pass through the interval space to protrude above the locking plates and are locked through the locking tools.

6. The anti-pulling detection reaction force device for a foundation pile according to claim 5, wherein, The locking tool includes a steel ring and at least two clamping pieces; the cross-section of the steel ring is in a trapezoidal shape with a wider upper part and a narrower lower part, the steel ring is sleeved on the upper end of the main reinforcement bar of the pile to be tested, and its bottom is closely attached to the top of the locking plate, and the clamping pieces are embedded in the steel ring and wrap the main reinforcement bar of the pile to be tested.

7. A reaction force device for pile uplift detection according to claim 5, characterized in that, The plurality of locking plates are arranged in a side-standing manner.

8. A reaction force device for detecting the uplift resistance of a foundation pile according to claim 5, characterized in that, The locking plates are made of high-strength steel plates.

Images