A device for anti-slide pile testing

Abstract

The present invention provides a device for anti-sliding pile test, characterized in that: the device includes a support frame and an elastic module; the support frame is used to support the anti-sliding pile and provide a reference benchmark for the spring deformation of the elastic module, the elastic module is composed of a plurality of stacked sub-elastic modules, each sub-elastic module includes 4 elastic components, the 4 elastic components are arranged around the anti-sliding pile to simulate the bedrock actually in contact with the anchoring section of the anti-sliding pile, when the anti-sliding pile is displaced during the test, the elastic module simulates the foundation reaction force generated by the bedrock on the anti-sliding pile by deformation. Applying the device of the present invention to the anti-sliding pile test, the data obtained in the test is more comprehensive and accurate, which greatly improves the authenticity and reliability of the actual force research results of the anti-sliding pile.

Description

Technical Field

[0001] The invention relates to the technical field of slope support, in particular to a device for anti-slide pile testing. Background Art

[0002] In the prior art, the anti-sliding pile test device uses a rigid support to fix the anchoring section of the anti-sliding pile, and the support will not deform or displace. Although such a device can simulate and detect the deformation of the free section of the anti-sliding pile under the thrust of the landslide to a certain extent, it ignores the influence of the foundation reaction force of the embedded bedrock that is actually in contact with the anchoring section of the anti-sliding pile on the anti-sliding pile. In fact, the properties of the bedrock in contact with the anti-sliding pile in different projects are different: some are hard rocks with high strength, high rigidity and small deformation, so the displacement of the anchoring section of the anti-sliding pile is small; some are soft rocks with low strength, low rigidity and large deformation, so the displacement of the anchoring section of the anti-sliding pile is large. Different bedrock properties determine different foundation reaction forces, and the foundation reaction force also plays an important role in the study of the stress and deformation law of the anti-sliding pile. If the effect of the bedrock foundation reaction force is not considered in the anti-sliding pile test, the stress condition of the anti-sliding pile in the test will be greatly deviated from the stress condition in actual use, resulting in inaccurate and incomplete test data, and even misjudgment of the design and use of the anti-sliding pile. Summary of the invention

[0003] In view of the problems in the background technology, the present invention provides a device for anti-slide pile testing to solve the problem that the anti-slide pile testing device in the prior art does not take the foundation reaction force into consideration, resulting in a large deviation between the test data and the actual data, and the test data is inaccurate and incomplete.

[0004] To achieve the purpose of the present invention, the present invention provides a device for anti-sliding pile test, the cross section of the anti-sliding pile is rectangular, and the innovation point is: the device includes a support frame and an elastic module; the support frame includes a bottom plate and four vertical plates, the bottom plate is rectangular, the bottom plate includes four rectangular edges, the four vertical plates are respectively fixed on the four rectangular edges on the side of the bottom plate, a single vertical plate is parallel to the corresponding rectangular edge, the four vertical plates are perpendicular to the bottom plate, the bottom plate is provided with bolt holes for fixing the support frame, the middle part of the vertical plate is provided with a plurality of first through holes, and the plurality of first through holes on a single vertical plate are evenly distributed along the vertical direction with respect to the bottom plate;

[0005] The elastic module is arranged in the supporting frame, and the elastic module is composed of a plurality of sub-elastic modules, and the plurality of sub-elastic modules are stacked in a direction perpendicular to the bottom plate; a single sub-elastic module is composed of four elastic components, and the four elastic components are respectively connected to the four vertical plates;

[0006] A single elastic component includes an inner plate, an outer plate, a connecting tube, a center rod, two support rods, three springs and two nuts; the inner plate and the outer plate are both rectangular, and the axial directions of the inner plate and the outer plate are parallel to the bottom plate; two second through holes and one third through hole are arranged on the outer side of the outer plate, the two second through holes are distributed along the axial direction of the outer plate, the third through hole is arranged between the two second through holes, the aperture of the second through hole matches the diameter of the support rod, and the aperture of the third through hole matches the diameter of the center rod; one end of the connecting tube is fixedly connected to the inner side surface of the vertical plate, and the other end of the connecting tube is fixedly connected to the outer side surface of the outer plate, the outer plate is parallel to the vertical plate connected thereto, and the inner plate is parallel to the outer plate; the hole of the connecting tube is opposite to the position of the first through hole at the corresponding height of the vertical plate, The hole of the connecting tube is also opposite to the position of the third through hole; one end of the center rod is fixedly connected to the outer side surface of the inner plate, and the other end of the center rod passes through the third through hole, the hole of the connecting tube and the first through hole in sequence and is exposed to the outer side surface of the vertical plate; the two support rods are respectively sleeved in the two second through holes, one end of the support rod is fixedly connected to the outer side surface of the inner plate, and the other end of the support rod passes through the outer side surface of the outer plate, and an external thread is provided on the outer circumferential surface of the rod segment of the support rod exposed to the outer side surface of the outer plate, and the external thread matches the internal thread of the nut; the two nuts are respectively sleeved on the external thread segments of the two support rods; the three springs are respectively sleeved on the center rod and the two support rods, one end of the spring contacts the outer side surface of the inner plate, and the other end of the spring contacts the inner side surface of the outer plate, and the spring is in a compressed state;

[0007] The inner plates of the four elastic components under the control of a single sub-elastic module form a rectangular frame, and the size of the rectangle formed by the rectangular frame matches the cross-sectional size of the anti-slip pile.

[0008] Furthermore, a scale is arranged on the outer peripheral surface of the rod section near the free end of the central rod, and the scale is arranged along the axial direction of the central rod.

[0009] The principle of the present invention is as follows:

[0010] The device described in the present invention is used to constrain the anchoring section of the anti-sliding pile in the anti-sliding pile test. In order to simulate the bedrock foundation reaction force that the anti-sliding pile is subjected to during actual use, the inventor creatively uses an elastic module to simulate bedrocks of different stiffnesses, and uses a supporting frame to provide a support reaction force and a reference benchmark for obtaining the spring deformation, and then obtains foundation parameters such as the foundation reaction force through calculation for use in the force study of the anti-sliding pile.

[0011] Specifically, the support frame provides a fixed foundation for the entire device, especially the vertical plates around it provide support reaction force for the test, and the outer surface of the vertical plate provides a reference benchmark for the deformation measurement of the elastic module; the core part of this device is the elastic module, and the elastic component therein is its smallest component unit. When a load in a certain direction is applied to the free section of the anti-slip pile in the test, the anti-slip pile will tilt and displace in the corresponding direction. At the same time, the anti-slip pile pushes the inner plate of the elastic component on the corresponding side to compress and deform the spring. The compression deformation of the spring can be obtained by the displacement of the center rod relative to the outer surface of the vertical plate. The elastic force generated by the compression deformation of the elastic component can be calculated by combining the number of springs in the elastic component and the elastic coefficient of the spring. This elastic force is the foundation reaction force of the bedrock at this depth simulated by the elastic component. Four elastic components at the same depth are arranged in four directions to form a sub-elastic module. For the sub-elastic module, according to the actual situation, the nuts of each elastic component can be adjusted to make the spring produce a certain pre-pressure to simulate the pressure of the bedrock in contact with the anchoring section of the anti-sliding pile in all directions in actual use. On the other hand, the arrangement of elastic components in all four directions is also more convenient for loading tests in all directions of the anti-sliding pile. Multiple sub-elastic modules are stacked in the vertical direction. The purpose is to obtain the foundation reaction force and related data of the anti-sliding pile at different depths by measuring the displacement of the center rod of the elastic components at different depths, so as to obtain more comprehensive and accurate test data. In order to more conveniently measure the displacement of the center rod, as an optimization, a scale is set on the free end rod section of the center rod, so that the deformation of the spring can be directly and conveniently read.

[0012] In fact, the number of springs and the elastic coefficient of the springs and other parameters of the device can be adjusted according to the parameters of the bedrock where the anti-sliding pile is actually located. For example, the maximum possible foundation reaction force and foundation coefficient of the bedrock where the anti-sliding pile is actually located can be combined with similarity theory to obtain the maximum foundation reaction force and foundation coefficient required for the test, and then the elastic coefficient and number of springs required for the test can be calculated, so that the device is closer to the stiffness and other properties of the actual bedrock, making the obtained test data more accurate. The above calculation methods and theories can be obtained by those skilled in the art from the materials or manuals of the prior art.

[0013] It can be seen that the present invention has the following beneficial effects: the device described in the present invention is used to carry out stress tests on anti-sliding piles. Since it can simulate the influence of bedrock deformation in the anchoring section of the anti-sliding piles on the stress of the anti-sliding piles, thereby obtaining actual foundation reaction force and other data, the data obtained from the test is more comprehensive and accurate, which greatly improves the authenticity and reliability of the actual stress research results of the anti-sliding piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings of the present invention are as follows.

[0015] AttachedFigure 1 It is a structural schematic diagram of the present invention;

[0016] Attached Figure 2 for Figure 1 A top view of

[0017] Attached Figure 3 It is a schematic diagram of the structure of the present invention used in the experiment.

[0018] In the figure: 1. bottom plate; 2. vertical plate; 3. inner plate; 4. outer plate; 5. connecting pipe; 6. center rod; 7. support rod; 8. spring; 9. nut; 10. anti-slip pile; 11. jack. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] As attached Figure 1 and attached Figure 2 The device for testing an anti-slip pile 10 shown in the figure has a rectangular cross section, and comprises a support frame and an elastic module; the support frame comprises a bottom plate 1 and four vertical plates 2, the bottom plate 1 is rectangular, the bottom plate 1 comprises four rectangular sides, the four vertical plates 2 are respectively fixedly arranged on the four rectangular sides on the upper side of the bottom plate 1, a single vertical plate 2 is parallel to the corresponding rectangular side, the four vertical plates 2 are all perpendicular to the bottom plate 1, the bottom plate 1 is provided with bolt holes for fixing the support frame to the test platform, a plurality of first through holes are provided in the middle of the vertical plate 2, and the plurality of first through holes on a single vertical plate 2 are evenly distributed along a direction perpendicular to the bottom plate;

[0021] The elastic module is arranged in the supporting frame, and the elastic module is composed of a plurality of sub-elastic modules, and the plurality of sub-elastic modules are stacked in a direction perpendicular to the bottom plate; a single sub-elastic module is composed of four elastic components, and the four elastic components are respectively connected to the four vertical plates 2;

[0022] A single elastic component includes an inner plate 3, an outer plate 4, a connecting tube 5, a center rod 6, two support rods 7, three springs 8 and two nuts 9; the inner plate 3 and the outer plate 4 are both rectangular, and the axial directions of the inner plate 3 and the outer plate 4 are parallel to the bottom plate 1; two second through holes and one third through hole are arranged on the outer side of the outer plate 4, the two second through holes are distributed along the axial direction of the outer plate 4, the third through hole is arranged between the two second through holes, the aperture of the second through hole matches the diameter of the support rod 7, and the aperture of the third through hole matches the diameter of the center rod 6; one end of the connecting tube 5 is fixedly connected to the inner side surface of the vertical plate 2, and the other end of the connecting tube 5 is fixedly connected to the outer side surface of the outer plate 4, the outer plate 4 is parallel to the vertical plate 2 connected thereto, and the inner plate 3 is parallel to the outer plate 4; the hole of the connecting tube 5 is opposite to the position of the first through hole at the corresponding height of the vertical plate 2, and the hole of the connecting tube 5 is also opposite to the position of the third through hole Relatively speaking; one end of the center rod 6 is fixedly connected to the outer side surface of the inner plate 3, and the other end of the center rod 6 passes through the third through hole, the hole of the connecting pipe and the first through hole in sequence and is exposed on the outer side surface of the vertical plate 2; a scale is provided on the outer circumferential surface of the rod segment near the free end of the center rod 6, and the scale is arranged along the axial direction of the center rod 6; the two support rods 7 are respectively sleeved in the two second through holes, one end of the support rod 7 is fixedly connected to the outer side surface of the inner plate 3, and the other end of the support rod 7 passes through the outer side surface of the outer plate 4, and an external thread is provided on the outer circumferential surface of the rod segment of the support rod 7 exposed on the outer side surface of the outer plate 4, and the external thread matches the internal thread of the nut 9; the two nuts 9 are respectively sleeved on the external thread segments of the two support rods 7; the three springs 8 are respectively sleeved on the center rod 6 and the two support rods 7, one end of the spring 8 contacts with the outer side surface of the inner plate 3, and the other end of the spring 8 contacts with the inner side surface of the outer plate 4, and the spring 8 is in a compressed state;

[0023] The inner plates 3 of the four elastic components under the control of a single sub-elastic module form a rectangular frame, and the size of the rectangle formed by the rectangular frame matches the cross-sectional size of the anti-slip pile 10 .

[0024] As attached Figure 3As shown, before the anti-sliding pile test, first put the anchoring section of the anti-sliding pile 10 into the central space of the device, so that the bottom surface of the anti-sliding pile 10 contacts the bottom plate 1, and then adjust the nuts 9 of each sub-elastic component so that the inner plate 3 of each sub-elastic component contacts the side of the anti-sliding pile 10. It is also possible to adjust the nut 9 to compress the spring 8 to apply a certain pre-pressure to the side of the anti-sliding pile according to the test needs, and record the pre-compression amount of the spring 9 of each elastic component. During the test, the jack 11 set on one side of the anti-sliding pile 10 applies loads to a certain side of the anti-sliding pile 10 in stages, so that the anti-sliding pile 10 deflects and displaces to squeeze the inner plate 3 of each elastic component on the opposite side. Each time a load is applied, the displacement of the central rod 6 of each elastic component relative to the outer side of the opposing plate 2 is recorded, that is, the compression amount of the spring 9 under this level of load is obtained, and then the foundation reaction force P generated by a certain elastic component under the current load can be calculated according to the spring compression amount obtained above by the following formula: m The formula is: P m =NK(x m0 +x mn ), where P m represents the foundation reaction force generated by the elastic component of the m-th layer of the sub-elastic module, the maximum value of m is the number of sub-elastic modules, that is, the maximum number of layers of the elastic module; N is the number of springs of a single elastic component, in this embodiment N = 3; K is the elastic coefficient of a single spring; x m0 is the pre-compression of the spring of the m-th layer elastic component; x mn is the compression of the spring of the m-th elastic component under the n-th level of load, where the maximum value of n is the maximum level of applied load.

Claims

1. A device for anti-sliding pile testing, wherein the cross section of the anti-sliding pile is rectangular, characterized in that: The device comprises a support frame and an elastic module; the support frame comprises a bottom plate (1) and four vertical plates (2); the bottom plate (1) is rectangular, the bottom plate (1) comprises four rectangular edges, the four vertical plates (2) are respectively fixedly arranged on the four rectangular edges on the upper side of the bottom plate (1), a single vertical plate (2) is parallel to the corresponding rectangular edge, the four vertical plates (2) are all perpendicular to the bottom plate (1), the bottom plate (1) is provided with bolt holes for fixing the support frame, a plurality of first through holes are provided in the middle of the vertical plate (2), and the plurality of first through holes on a single vertical plate (2) are evenly distributed along a direction perpendicular to the bottom plate; The elastic module is arranged in the support frame, and the elastic module is composed of a plurality of sub-elastic modules, and the plurality of sub-elastic modules are stacked in a direction perpendicular to the bottom plate; a single sub-elastic module is composed of four elastic components, and the four elastic components are respectively connected to the four vertical plates (2); A single elastic component comprises an inner plate (3), an outer plate (4), a connecting pipe (5), a center rod (6), two supporting rods (7), three springs (8) and two nuts (9); the inner plate (3) and the outer plate (4) are both rectangular, and the axial direction of the inner plate (3) and the axial direction of the outer plate (4) are both parallel to the bottom plate (1); two second through holes and one third through hole are arranged on the outer surface of the outer plate (4), the two second through holes are distributed along the axial direction of the outer plate (4), and the third through hole is arranged on the two The second through hole is connected to the support rod (7), the diameter of the second through hole matches the diameter of the support rod (7), and the diameter of the third through hole matches the diameter of the center rod (6); one end of the connecting tube (5) is fixedly connected to the inner side surface of the vertical plate (2), and the other end of the connecting tube (5) is fixedly connected to the outer side surface of the outer plate (4); the outer plate (4) is parallel to the vertical plate (2) to which it is connected, and the inner plate (3) is parallel to the outer plate (4); the hole of the connecting tube (5) is located at a height corresponding to the first through hole of the vertical plate (2). The hole of the connecting tube (5) is opposite to the position of the third through hole; one end of the central rod (6) is fixedly connected to the outer side surface of the inner plate (3), and the other end of the central rod (6) passes through the third through hole, the hole of the connecting tube and the first through hole in sequence and is exposed on the outer side surface of the vertical plate (2); the two support rods (7) are respectively inserted into the two second through holes, one end of the support rod (7) is fixedly connected to the outer side surface of the inner plate (3), and the other end of the support rod (7) passes through the outer side surface of the outer plate (4). An external thread is provided on the outer peripheral surface of the rod section of the support rod (7) exposed from the outer side surface of the outer plate (4), and the external thread matches the internal thread of the nut (9); two nuts (9) are respectively mounted on the external thread sections of the two support rods (7); three springs (8) are respectively mounted on the central rod (6) and the two support rods (7), one end of the spring (8) contacts the outer side surface of the inner plate (3), and the other end of the spring (8) contacts the inner side surface of the outer plate (4), and the spring (8) is in a compressed state; The inner plates (3) of the four elastic components under the control of a single sub-elastic module form a rectangular frame, and the size of the rectangle formed by the rectangular frame matches the cross-sectional size of the anti-slip pile; The elastic coefficient of the spring (8) is determined according to the maximum foundation reaction force and foundation coefficient of the bedrock where the anti-sliding pile is actually located.

2. The device for anti-sliding pile testing according to claim 1, characterized in that: A scale is provided on the outer peripheral surface of the rod section near the free end of the central rod (6), and the scale is provided along the axial direction of the central rod (6).

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