Small-tonnage foundation pile pull-out test device

Abstract

The invention discloses a small-tonnage foundation pile pull-out test device which comprises a supporting mechanism, a drawing mechanism, a driving mechanism, a triggering mechanism, a sleeving mechanism and a locking mechanism, the driving mechanism is used for driving the triggering mechanism and the sleeving mechanism to move downwards synchronously, the sleeving mechanism is connected to the outer sides of a plurality of steel bars in a sleeving mode after moving downwards, preconditions are provided for subsequent locking of the steel bars, and the locking effect is good. And then due to the blocking of the foundation pile on the sleeving mechanism after moving downwards, the driving mechanism continues to drive the triggering mechanism to move downwards, the triggering mechanism triggers the multiple locking mechanisms after moving downwards, and the locking mechanisms are matched with the sleeving mechanism to clamp and lock the multiple steel bars after being triggered so as to be matched with the supporting mechanism to carry out an anti-pulling test on the foundation pile. Compared with an existing device of the same type, the device has the advantages that the pre-operation before test is effectively simplified, the automation degree is higher, the labor is saved, the test efficiency is improved, in addition, the device can be recycled, and the test cost is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the field of pile pull-out test, and in particular relates to a small-tonnage pile pull-out test device. Background Art

[0002] The static pull-out load test of a pile foundation refers to a test method in which an upward vertical force is applied to the top of the pile to observe the upward displacement of the pile body as a whole under a certain period of time to determine the corresponding pull-out bearing capacity of the single pile.

[0003] Before the pull-out test of the existing scheme begins, the operator needs to install multiple connecting rods in turn and put grouting sleeves on the outside of the connecting rods, then pour slurry into the grouting sleeves and wait for the slurry to solidify before starting the test process. The pre-operation is too cumbersome, labor-intensive and affects the test efficiency. At the same time, since the solidified slurry will cover the outside of the connecting rod, the connecting rod cannot be used again, which significantly increases the test cost. Summary of the invention

[0004] The present invention provides a small-tonnage pile pull-out test device, which effectively simplifies the pre-operation before the test and has a higher degree of automation, thereby saving manpower and improving test efficiency. In addition, the device can be recycled, thereby effectively reducing the test cost.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0006] A small-tonnage pile pullout test device comprises pads arranged on both sides of the pile, a support mechanism is arranged on the top of the two pads, a pulling mechanism is arranged inside the support mechanism, a driving mechanism is sleeved on the bottom of the outer side of the pulling mechanism, a trigger mechanism is sleeved on the outer side of the driving mechanism, and a sleeve mechanism is arranged at the bottom of the driving mechanism, and a plurality of locking mechanisms are evenly arranged on the top of the sleeve mechanism;

[0007] The driving mechanism drives the trigger mechanism and the socket mechanism to move downward synchronously. After the socket mechanism moves downward, it sockets on the exposed steel bars on the top of the pile foundation. The pile foundation blocks the socket mechanism after it moves downward. The driving mechanism continues to drive the trigger mechanism to move downward. After the trigger mechanism moves downward, it triggers multiple locking mechanisms. After the locking mechanism is triggered, it cooperates with the socket mechanism to clamp and lock multiple steel bars.

[0008] Further technology of the present invention:

[0009] Preferably, the supporting mechanism comprises a crossbeam and a through-type jack, wherein the crossbeam is placed on top of two cushion blocks, and the through-type jack is fixedly disposed on the top of the crossbeam.

[0010] Preferably, the drawing mechanism comprises a drawing tube, a limiting ring, a drawing rod, a first limiting plate and a second limiting plate;

[0011] Among them, the pulling tube is located on the inner side of the through-type jack, the limiting ring is fixedly sleeved on the top of the outer side of the pulling tube and its bottom is in contact with the top of the output shaft of the through-type jack, the pulling rod is slidably arranged on the inner side of the pulling tube along the vertical direction, the first limiting plate is fixedly arranged on the top of the pulling rod, and the second limiting plate is fixedly arranged on the bottom of the pulling rod.

[0012] Preferably, the driving mechanism comprises a first outer sleeve, a reciprocating screw, a driving motor, an outer sleeve, a first return spring and an inner sleeve;

[0013] Among them, the first outer sleeve is fixedly sleeved on the outside of the drawing tube, the reciprocating screw is penetrated and arranged on one side of the bottom of the first outer sleeve and is rotatably connected with the first outer sleeve through a bearing, the driving motor is fixedly arranged on the top of the first outer sleeve and is rotatably connected with the reciprocating screw, the outer sleeve, the first return spring and the inner sleeve are sleeved on the outside of the reciprocating screw in sequence from top to bottom, the outer sleeve is rotatably connected with the reciprocating screw, the first return spring is fixedly connected between the inner wall of the outer sleeve and the top of the inner sleeve, the inner sleeve is slidably connected with the reciprocating screw and is slidably nested in the inner side of the outer sleeve along the vertical direction.

[0014] Preferably, the trigger mechanism comprises a second outer sleeve, a first trigger block and an avoidance channel;

[0015] Among them, the second outer sleeve plate is fixedly sleeved on the outer bottom of the outer sleeve and slidably sleeved on the side of the pull rod along the vertical direction. There are multiple first trigger blocks and avoidance channels. Multiple first trigger blocks are evenly fixed at the bottom edge of the second outer sleeve plate. An inclined surface is provided at the bottom end of the first trigger block, and multiple avoidance channels are evenly opened at the bottom of the first trigger block.

[0016] Preferably, the sleeve connection mechanism comprises an end plate, a sleeve connection groove, a support ring, a locking ring and an inner locking groove;

[0017] Among them, the end plate is fixedly arranged at the bottom end of the inner sleeve and fixedly sleeved at the bottom end of the outer side of the pull rod, the support ring is fixedly arranged at the bottom of the end plate, the locking ring is fixedly arranged at the top of the end plate, and there are multiple sleeve grooves and inner locking grooves, and multiple sleeve grooves are evenly arranged at the top of the end plate, and multiple inner locking grooves are evenly arranged on the outer side of the locking ring.

[0018] Preferably, the locking mechanism comprises a fixing plate, a sliding rod, a second trigger block, a locking plate, an outer locking groove and a second return spring;

[0019] Among them, the fixed plate is fixedly arranged on the top of the end plate, the sliding rod passes through the fixed plate and is slidably connected with the fixed plate, the second trigger block is fixedly arranged on the outer end of the sliding rod and an inclined surface is arranged on the top of the sliding rod, the locking plate is fixedly arranged on the inner end of the sliding rod, the outer locking groove is opened on the inner side of the locking plate, and the second return spring is sleeved on the outer side of the sliding rod and fixedly connected between the fixed plate and the locking plate.

[0020] Preferably, the method of use specifically comprises the following steps:

[0021] S1, start the driving motor. After the driving motor is started, it drives the reciprocating screw to rotate. When the reciprocating screw rotates, it drives the outer sleeve to move downward. When the outer sleeve moves downward, it drives the inner sleeve to move downward through the first reset spring. When the inner sleeve moves downward, it drives the sleeve mechanism and multiple locking mechanisms to move downward synchronously. The second outer sleeve plate drives multiple first trigger blocks to move downward. During the downward movement of the sleeve mechanism, multiple steel bars on the top of the foundation pile gradually enter the inner side of the multiple sleeve grooves and pass through the top of the multiple sleeve grooves. At the same time, the end plate drives the pull rod to continuously move downward on the inner side of the pull tube. When the pull rod moves downward, it drives the first limit plate to move downward synchronously.

[0022] S2, when the outer sleeve descends to a first threshold, the bottom of the support ring contacts the top of the foundation pile, the bottom of the first limit plate contacts the top of the limit ring, and the outer wall of the steel bar fits the inner wall of the inner locking groove. At this time, due to the obstruction of the foundation pile, the support ring cannot continue to descend. Subsequently, as the outer sleeve continues to descend, the inner sleeve that is also unable to descend compresses the first reset spring, and at the same time, the outer sleeve drives the multiple first trigger blocks to continue to descend through the second outer sleeve plate;

[0023] S3, when the outer sleeve descends to a second threshold, the inclined surface at the bottom of the first trigger block fits with the inclined surface at the top of the second trigger block. As the first trigger block continues to move downward, the first trigger block pushes the second trigger block inward. After being pushed, the second trigger block drives the locking plate to move inward through the sliding rod. During the inward movement of the locking plate, the second return spring is stretched.

[0024] S4, when the outer sleeve descends to a third threshold, the inner wall of the outer locking groove fits the outer wall of the steel bar. When the outer sleeve descends to a fourth threshold, the outer sleeve moves to the bottom of the reciprocating thread on the outer side of the reciprocating screw. At the same time, the outer locking groove cooperates with the inner locking groove to lock the steel bar. At this time, the drive motor is stopped.

[0025] S5, driving the through-type jack to move its output shaft upward, and when the through-type jack output shaft moves upward, the first limit plate is pushed through the pulling tube and the limit ring, and the first limit plate pulls the end plate through the pulling rod, and the end plate pulls the steel bar and the foundation pile through multiple locking mechanisms, thereby realizing the pull-out test of the foundation pile;

[0026] S6. After the test is completed, the through-type jack drives its output shaft to move downward and reset, and then the driving motor is started again. After the driving motor is started, it continues to drive the reciprocating screw to rotate. When the reciprocating screw rotates, it drives the outer sleeve to move upward and reset. During the upward movement of the outer sleeve, the second outer sleeve plate drives multiple first trigger blocks to move upward. After the first trigger block moves upward, the push on the second trigger block is gradually released. At this time, the stretched second reset spring drives the locking plate to move outward and reset. During the outward movement of the locking plate, the sliding rod drives the second trigger block to reset synchronously.

[0027] S7, when the upward movement distance of the outer sleeve reaches the fifth threshold value, the outer sleeve arrives at the initial position, that is, the top of the reciprocating thread on the outer side of the reciprocating screw, and the drive motor is stopped at this time.

[0028] The beneficial effects of the present invention are:

[0029] The present invention is provided with a supporting mechanism, a pulling mechanism, a driving mechanism, a triggering mechanism, a socketing mechanism and a locking mechanism, so that the driving mechanism can be used to drive the triggering mechanism and the socketing mechanism to move downward synchronously. After the socketing mechanism moves downward, it is socketed on the outside of multiple steel bars, providing a prerequisite for the subsequent locking of the steel bars. Subsequently, due to the obstruction of the socketing mechanism after the downward movement by the foundation pile, the driving mechanism continues to drive the triggering mechanism to move downward. After the triggering mechanism moves downward, it triggers multiple locking mechanisms. After the locking mechanism is triggered, it cooperates with the socketing mechanism to clamp and lock multiple steel bars, so as to cooperate with the supporting mechanism to carry out the pull-out test of the foundation pile. Compared with the existing devices of the same type, the present invention effectively simplifies the pre-operation before the start of the test and has a higher degree of automation, which saves manpower and improves the test efficiency. In addition, the device can be recycled, thereby effectively reducing the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0032] Figure 2 It is a schematic cross-sectional structural diagram of the support mechanism of the present invention.

[0033] Figure 3 It is a schematic cross-sectional structural diagram of the drawing mechanism of the present invention.

[0034] Figure 4 It is a schematic cross-sectional view of the driving mechanism and the triggering mechanism of the present invention.

[0035] Figure 5It is a schematic cross-sectional structural diagram of the sleeve connection mechanism and the locking mechanism of the present invention.

[0036] In the figure: 11, foundation pile; 12, steel bar; 13, pad; 2, support mechanism; 21, crossbeam; 22, through-type jack; 3, pulling mechanism; 31, pulling tube; 32, limit ring; 33, pulling rod; 34, first limit plate; 35, second limit plate; 4, driving mechanism; 41, first outer sleeve; 42, reciprocating screw; 43, driving motor; 44, outer sleeve; 45, first return spring; 46, inner sleeve; 5, trigger mechanism; 51, second outer sleeve; 52, first trigger block; 53, avoidance channel; 6, socket mechanism; 61, end plate; 62, socket groove; 63, support ring; 64, locking ring; 65, inner locking groove; 7, locking mechanism; 71, fixing plate; 72, sliding rod; 73, second trigger block; 74, locking plate; 75, outer locking groove; 76, second return spring. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be further described in detail below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention but not all. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] The present invention provides Figure 1-Figure 5 A small-tonnage pile pullout test device is shown, comprising pads 13 arranged on both sides of a pile 11, a support mechanism 2 is arranged on the top of the two pads 13, a pulling mechanism 3 is arranged inside the support mechanism 2, a driving mechanism 4 is sleeved on the bottom of the outer side of the pulling mechanism 3, a trigger mechanism 5 is sleeved on the outer side of the driving mechanism 4, and a sleeve mechanism 6 is arranged at the bottom of the driving mechanism 4, and a plurality of locking mechanisms 7 are evenly arranged on the top of the sleeve mechanism 6;

[0039] The driving mechanism 4 drives the trigger mechanism 5 and the socket mechanism 6 to move downward synchronously. After the socket mechanism 6 moves downward, it is socketed on the outside of multiple steel bars 12. The foundation pile 11 blocks the socket mechanism 6 after it moves downward. The driving mechanism 4 continues to drive the trigger mechanism 5 to move downward. After the trigger mechanism 5 moves downward, it triggers multiple locking mechanisms 7. After being triggered, the locking mechanism 7 cooperates with the socket mechanism 6 to clamp and lock the multiple steel bars 12.

[0040] like Figure 2 As shown, the support mechanism 2 includes a crossbeam 21 and a through-type jack 22 , wherein the crossbeam 21 is placed on top of two cushion blocks 13 , and the through-type jack 22 is fixedly disposed on the top of the crossbeam 21 .

[0041] like Figure 3 As shown, the pulling mechanism 3 includes a pulling tube 31, a limiting ring 32, a pulling rod 33, a first limiting plate 34 and a second limiting plate 35, wherein the pulling tube 31 is located on the inner side of the through-type jack 22, the limiting ring 32 is fixedly sleeved on the outer top of the pulling tube 31 and its bottom is in contact with the top of the output shaft of the through-type jack 22, the pulling rod 33 is slidably arranged on the inner side of the pulling tube 31 along the vertical direction, the first limiting plate 34 is fixedly arranged on the top of the pulling rod 33, and the second limiting plate 35 is fixedly arranged on the bottom end of the pulling rod 33.

[0042] By providing the above-mentioned supporting mechanism 2 and drawing mechanism 3, when the end plate 61 moves downward, the drawing rod 33 is driven to continuously move downward inside the drawing tube 31, and when the drawing rod 33 moves downward, the first limit plate 34 is driven to move downward synchronously;

[0043] Subsequently, when the pull-out test begins, the through-type jack 22 drives its output shaft to move upward. When the output shaft of the through-type jack 22 moves upward, the first limit plate 34 is pushed through the pulling tube 31 and the limit ring 32. The first limit plate 34 pulls the end plate 61 through the pulling rod 33. The end plate 61 pulls the steel bar 12 and the pile 11 through multiple locking mechanisms 7, thereby realizing the pull-out test of the pile 11.

[0044] like Figure 4 As shown, the driving mechanism 4 includes a first outer sleeve 41, a reciprocating screw 42, a driving motor 43, an outer sleeve 44, a first return spring 45 and an inner sleeve 46, wherein the first outer sleeve 41 is fixedly sleeved on the outside of the drawing tube 31, the reciprocating screw 42 is penetrated and arranged on the left side of the bottom of the first outer sleeve 41 and is rotatably connected to the first outer sleeve 41 through a bearing, the driving motor 43 is fixedly arranged on the top of the first outer sleeve 41 and is rotatably connected to the reciprocating screw 42, the outer sleeve 44, the first return spring 45 and the inner sleeve 46 are sleeved on the outside of the reciprocating screw 42 in sequence from top to bottom, the outer sleeve 44 is rotatably connected to the reciprocating screw 42, the first return spring 45 is fixedly connected between the inner wall of the outer sleeve 44 and the top of the inner sleeve 46, the inner sleeve 46 is slidably connected to the reciprocating screw 42 and is slidably nested in the inner side of the outer sleeve 44 along the vertical direction.

[0045] By setting the above structure, the driving motor 43 can drive the reciprocating screw 42 to rotate after it is started. When the reciprocating screw 42 rotates, it drives the outer sleeve 44 to move downward. When the outer sleeve 44 moves downward, the inner sleeve 46 is driven downward by the first return spring 45. When the inner sleeve 46 moves downward, it drives the socket mechanism 6 and multiple locking mechanisms 7 to move downward synchronously.

[0046] like Figure 4As shown, the trigger mechanism 5 includes a second outer sleeve plate 51, a first trigger block 52 and an avoidance channel 53, wherein the second outer sleeve plate 51 is fixedly sleeved on the outer bottom of the outer sleeve 44 and slidably sleeved on the side of the pulling rod 33 along the vertical direction, and a plurality of the first trigger blocks 52 and the avoidance channel 53 are provided, and a plurality of the first trigger blocks 52 are evenly fixed at the bottom edge of the second outer sleeve plate 51, and an inclined surface is provided at the bottom end of the first trigger block 52, and a plurality of the avoidance channels 53 are evenly opened at the bottom of the first trigger block 52.

[0047] By setting the above structure, when the inner sleeve 46 moves downward, the second outer sleeve plate 51 drives the multiple first trigger blocks 52 to move downward. As the first trigger blocks 52 continue to move downward, the multiple first trigger blocks 52 trigger the multiple locking mechanisms 7 respectively, thereby completing the clamping and locking of the multiple steel bars 12.

[0048] like Figure 5 As shown, the sleeve mechanism 6 includes an end plate 61, a sleeve groove 62, a support ring 63, a locking ring 64 and an inner locking groove 65, wherein the end plate 61 is fixedly arranged at the bottom end of the inner sleeve 46 and fixedly sleeved at the outer bottom end of the pulling rod 33, the support ring 63 is fixedly arranged at the bottom of the end plate 61, the locking ring 64 is fixedly arranged at the top of the end plate 61, and a plurality of the sleeve grooves 62 and the inner locking grooves 65 are provided, and a plurality of the sleeve grooves 62 are evenly arranged at the top of the end plate 61, and a plurality of the inner locking grooves 65 are evenly arranged at the outer side of the locking ring 64.

[0049] By setting the above-mentioned driving mechanism 4 and the sleeve mechanism 6, the sleeve mechanism 6 can be driven to move downward synchronously when the inner sleeve 46 moves downward. During the downward movement of the sleeve mechanism 6, multiple steel bars 12 on the top of the foundation pile 11 gradually enter the inner side of the multiple sleeve grooves 62 and pass through the top of the multiple sleeve grooves 62. When the bottom of the subsequent support ring 63 contacts the top of the foundation pile 11, the bottom of the first limit plate 34 contacts the top of the limit ring 32, and the outer wall of the steel bar 12 fits with the inner wall of the inner locking groove 65. At this time, due to the obstruction of the foundation pile 11, the support ring 63 cannot continue to descend. Subsequently, as the outer sleeve 44 continues to descend, the inner sleeve 46 that is also unable to descend compresses the first reset spring 45. At the same time, the outer sleeve 44 drives the multiple first trigger blocks 52 to continue to descend through the second outer sleeve plate 51.

[0050] like Figure 5As shown, the locking mechanism 7 includes a fixed plate 71, a sliding rod 72, a second trigger block 73, a locking plate 74, an outer locking groove 75 and a second return spring 76, wherein the fixed plate 71 is fixedly arranged on the top of the end plate 61, the sliding rod 72 passes through the fixed plate 71 and is slidably connected to the fixed plate 71, the second trigger block 73 is fixedly arranged on the outer end of the sliding rod 72 and an inclined surface is arranged on the top end thereof, the locking plate 74 is fixedly arranged on the inner end of the sliding rod 72, the outer locking groove 75 is opened on the inner side of the locking plate 74, and the second return spring 76 is sleeved on the outer side of the sliding rod 72 and fixedly connected between the fixed plate 71 and the locking plate 74.

[0051] By setting the above structure, after the inclined surface at the bottom end of the first trigger block 52 fits with the inclined surface at the top end of the second trigger block 73, as the first trigger block 52 continues to move downward, the first trigger block 52 pushes the second trigger block 73 inward, and the second trigger block 73 drives the locking plate 74 to move inward through the sliding rod 72 after being pushed. During the inward movement of the locking plate 74, the second return spring 76 is stretched until the inner wall of the outer locking groove 75 fits with the outer wall of the steel bar 12 and cooperates with the inner locking groove 65 to complete the locking of the steel bar 12, so as to provide a precondition for the subsequent pull-out test;

[0052] When the first trigger block 52 moves up and resets, the first trigger block 52 gradually releases the push on the second trigger block 73. At this time, the stretched second reset spring 76 drives the locking plate 74 to move outward and reset. During the outward movement of the locking plate 74, the second trigger block 73 is synchronously reset through the sliding rod 72.

[0053] The present invention also discloses a method for using a small-tonnage pile pullout test device, which specifically comprises the following steps:

[0054] S1, start the driving motor 43. After the driving motor 43 is started, it drives the reciprocating screw 42 to rotate. When the reciprocating screw 42 rotates, it drives the outer sleeve 44 to move downward. When the outer sleeve 44 moves downward, it drives the inner sleeve 46 to move downward through the first return spring 45. When the inner sleeve 46 moves downward, it drives the sleeve connection mechanism 6 and multiple locking mechanisms 7 to move downward synchronously, and drives multiple first trigger blocks 52 to move downward through the second outer sleeve plate 51. During the downward movement of the sleeve connection mechanism 6, multiple steel bars 12 on the top of the foundation pile 11 gradually enter the inner side of the multiple sleeve connection grooves 62 and pass through the top of the multiple sleeve connection grooves 62. At the same time, the end plate 61 drives the pulling rod 33 to continuously move downward on the inner side of the pulling tube 31. When the pulling rod 33 moves downward, it drives the first limit plate 34 to move downward synchronously.

[0055] S2, when the outer sleeve 44 descends to a first threshold, the bottom of the support ring 63 contacts the top of the pile 11, the bottom of the first limit plate 34 contacts the top of the limit ring 32, and the outer wall of the steel bar 12 fits the inner wall of the inner locking groove 65. At this time, due to the obstruction of the pile 11, the support ring 63 cannot continue to descend. Subsequently, as the outer sleeve 44 continues to descend, the inner sleeve 46, which is also unable to descend, compresses the first return spring 45. At the same time, the outer sleeve 44 drives the multiple first trigger blocks 52 to continue to descend through the second outer sleeve plate 51.

[0056] S3, when the outer sleeve 44 descends to a second threshold, the inclined surface at the bottom end of the first trigger block 52 fits with the inclined surface at the top end of the second trigger block 73. Subsequently, as the first trigger block 52 continues to move downward, the first trigger block 52 pushes the second trigger block 73 inward. After being pushed, the second trigger block 73 drives the locking plate 74 to move inward through the sliding rod 72. During the inward movement of the locking plate 74, the second return spring 76 is stretched.

[0057] S4, when the outer sleeve 44 descends to a third threshold, the inner wall of the outer locking groove 75 fits the outer wall of the steel bar 12, and when the outer sleeve 44 descends to a fourth threshold, the outer sleeve 44 moves to the bottom of the reciprocating thread on the outer side of the reciprocating screw 42, and at the same time, the outer locking groove 75 cooperates with the inner locking groove 65 to lock the steel bar 12, and the drive motor 43 is stopped at this time;

[0058] S5, the through-type jack 22 drives its output shaft to move upward, and when the output shaft of the through-type jack 22 moves upward, the first limit plate 34 is pushed through the pulling tube 31 and the limit ring 32, and the first limit plate 34 pulls the end plate 61 through the pulling rod 33, and the end plate 61 pulls the steel bar 12 and the foundation pile 11 through the multiple locking mechanisms 7, thereby realizing the pull-out test of the foundation pile 11;

[0059] S6. After the test is completed, the through-type jack 22 drives its output shaft to move downward and reset, and then the drive motor 43 is started again. After the drive motor 43 is started, it continues to drive the reciprocating screw 42 to rotate. When the reciprocating screw 42 rotates, it drives the outer sleeve 44 to move upward and reset. During the upward movement of the outer sleeve 44, the second outer sleeve plate 51 drives multiple first trigger blocks 52 to move upward. After the first trigger block 52 moves upward, the push on the second trigger block 73 is gradually released. At this time, the stretched second reset spring 76 drives the locking plate 74 to move outward and reset. During the outward movement of the locking plate 74, the sliding rod 72 drives the second trigger block 73 to reset synchronously.

[0060] S7, when the upward movement distance of the outer sleeve 44 reaches the fifth threshold, the outer sleeve 44 arrives at the initial position, that is, the top of the reciprocating thread on the outer side of the reciprocating screw 42, and the driving motor 43 is stopped at this time.

[0061] It should also be noted that the first threshold, the second threshold, the third threshold and the fourth threshold increase in sequence, and the first threshold, the second threshold, the third threshold, the fourth threshold and the fifth threshold are recorded for the convenience of accurately describing the actual working conditions of the scheme;

[0062] When the solution of the present application is actually produced, according to the actual specifications of the reciprocating screw 42, the first threshold value, the second threshold value, the third threshold value, the fourth threshold value and the fifth threshold value are all specific values.

[0063] In this article, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0064] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A small tonnage pile pull-out test device, characterized in that: It comprises pads (13) arranged on both sides of a foundation pile (11), a support mechanism (2) being arranged on the top of the two pads (13), a pulling mechanism (3) being arranged on the inner side of the support mechanism (2), a driving mechanism (4) being sleeved on the outer bottom of the pulling mechanism (3), a trigger mechanism (5) being sleeved on the outer side of the driving mechanism (4), and a sleeve mechanism (6) being arranged on the bottom of the driving mechanism (4), and a plurality of locking mechanisms (7) being evenly arranged on the top of the sleeve mechanism (6); The driving mechanism (4) drives the trigger mechanism (5) and the sleeve mechanism (6) to move downward synchronously; after the sleeve mechanism (6) moves downward, it sleeves onto the exposed steel bars (12) on the top of the foundation pile (11); the foundation pile (11) blocks the sleeve mechanism (6) after it moves downward; the driving mechanism (4) continues to drive the trigger mechanism (5) to move downward; after the trigger mechanism (5) moves downward, it triggers the plurality of locking mechanisms (7); after the locking mechanisms (7) are triggered, they cooperate with the sleeve mechanism (6) to clamp and lock the plurality of steel bars (12).

2. A small tonnage pile pull-out test device according to claim 1, characterized in that: The support mechanism (2) comprises a crossbeam (21) and a through-type jack (22), wherein the crossbeam (21) is placed on top of two cushion blocks (13), and the through-type jack (22) is fixedly arranged on the top of the crossbeam (21).

3. A small tonnage pile pull-out test device according to claim 2, characterized in that: The drawing mechanism (3) comprises a drawing tube (31), a limiting ring (32), a drawing rod (33), a first limiting plate (34) and a second limiting plate (35); The pulling tube (31) is located on the inner side of the through-type jack (22), the limiting ring (32) is fixedly sleeved on the outer top of the pulling tube (31) and its bottom is in contact with the top of the output shaft of the through-type jack (22), the pulling rod (33) is slidably arranged on the inner side of the pulling tube (31) along the vertical direction, the first limiting plate (34) is fixedly arranged on the top of the pulling rod (33), and the second limiting plate (35) is fixedly arranged on the bottom of the pulling rod (33).

4. A small tonnage pile pull-out test device according to claim 3, characterized in that: The driving mechanism (4) comprises a first outer sleeve (41), a reciprocating screw (42), a driving motor (43), an outer sleeve (44), a first return spring (45) and an inner sleeve (46); In which, the first outer sleeve (41) is fixedly sleeved on the outside of the drawing tube (31), the reciprocating screw (42) is penetrated and arranged on one side of the bottom of the first outer sleeve (41) and is rotationally connected to the first outer sleeve (41) through a bearing, the driving motor (43) is fixedly arranged on the top of the first outer sleeve (41) and is rotationally connected to the reciprocating screw (42), the outer sleeve (44), the first return spring (45) and the inner sleeve (46) are sleeved on the outside of the reciprocating screw (42) in sequence from top to bottom, the outer sleeve (44) is rotationally connected to the reciprocating screw (42), the first return spring (45) is fixedly connected between the inner wall of the outer sleeve (44) and the top of the inner sleeve (46), the inner sleeve (46) is slidably connected to the reciprocating screw (42) and is slidably nested in the inner side of the outer sleeve (44) along the vertical direction.

5. A small tonnage pile pull-out test device according to claim 4, characterized in that: The trigger mechanism (5) comprises a second outer sleeve (51), a first trigger block (52) and an avoidance channel (53); The second outer sleeve (51) is fixedly sleeved on the outer bottom of the outer sleeve (44) and slidably sleeved on the side of the pull rod (33) in the vertical direction. A plurality of the first trigger blocks (52) and the avoidance channels (53) are provided. The plurality of the first trigger blocks (52) are evenly fixedly provided at the bottom edge of the second outer sleeve (51). An inclined surface is provided at the bottom end of the first trigger block (52). The plurality of avoidance channels (53) are evenly opened at the bottom of the first trigger block (52).

6. A small tonnage pile pull-out test device according to claim 5, characterized in that: The sleeve connection mechanism (6) comprises an end plate (61), a sleeve connection groove (62), a support ring (63), a locking ring (64) and an inner locking groove (65); The end plate (61) is fixedly arranged at the bottom end of the inner sleeve (46) and fixedly sleeved at the outer bottom end of the pull rod (33); the support ring (63) is fixedly arranged at the bottom of the end plate (61); the locking ring (64) is fixedly arranged at the top of the end plate (61); a plurality of sleeve grooves (62) and inner locking grooves (65) are provided; a plurality of sleeve grooves (62) are evenly arranged at the top of the end plate (61); and a plurality of inner locking grooves (65) are evenly arranged at the outer side of the locking ring (64).

7. A small tonnage pile pull-out test device according to claim 6, characterized in that: The locking mechanism (7) comprises a fixing plate (71), a sliding rod (72), a second trigger block (73), a locking plate (74), an outer locking groove (75) and a second return spring (76); The fixing plate (71) is fixedly arranged on the top of the end plate (61), the sliding rod (72) passes through the fixing plate (71) and is slidably connected to the fixing plate (71), the second trigger block (73) is fixedly arranged on the outer end of the sliding rod (72) and an inclined surface is arranged on the top end thereof, the locking plate (74) is fixedly arranged on the inner end of the sliding rod (72), the outer locking groove (75) is opened on the inner side of the locking plate (74), and the second return spring (76) is sleeved on the outer side of the sliding rod (72) and is fixedly connected between the fixing plate (71) and the locking plate (74).

8. A small tonnage pile pull-out test device according to claim 7, characterized in that: The specific method of use includes the following steps: S1, start the driving motor (43). After the driving motor (43) is started, it drives the reciprocating screw (42) to rotate. When the reciprocating screw (42) rotates, it drives the outer sleeve (44) to move downward. When the outer sleeve (44) moves downward, it drives the inner sleeve (46) to move downward through the first return spring (45). When the inner sleeve (46) moves downward, it drives the sleeve mechanism (6) and the multiple locking mechanisms (7) to move downward synchronously. The multiple first trigger blocks (52) are driven downward through the second outer sleeve plate (51). During the downward movement of the sleeve mechanism (6), the multiple steel bars (12) on the top of the foundation pile (11) gradually enter the inner side of the multiple sleeve grooves (62) and pass through the top of the multiple sleeve grooves (62). At the same time, the end plate (61) drives the pulling rod (33) to continuously move downward inside the pulling tube (31). When the pulling rod (33) moves downward, it drives the first limit plate (34) to move downward synchronously. S2, when the outer sleeve (44) descends a distance reaching a first threshold, the bottom of the support ring (63) contacts the top of the foundation pile (11), the bottom of the first limit plate (34) contacts the top of the limit ring (32), and the outer wall of the steel bar (12) fits the inner wall of the inner locking groove (65). At this time, due to the obstruction of the foundation pile (11), the support ring (63) cannot continue to descend. Subsequently, as the outer sleeve (44) continues to descend, the inner sleeve (46) which is also unable to descend compresses the first return spring (45), and at the same time, the outer sleeve (44) drives the plurality of first trigger blocks (52) to continue to descend through the second outer sleeve plate (51); S3, when the outer sleeve (44) descends a distance reaching a second threshold, the inclined surface at the bottom end of the first trigger block (52) fits with the inclined surface at the top end of the second trigger block (73), and as the first trigger block (52) continues to move downward, the first trigger block (52) pushes the second trigger block (73) inward, and after being pushed, the second trigger block (73) drives the locking plate (74) to move inward through the sliding rod (72), and the second return spring (76) is stretched during the inward movement of the locking plate (74); S4, when the outer sleeve (44) descends a distance that reaches a third threshold, the inner wall of the outer locking groove (75) fits against the outer wall of the steel bar (12), and when the outer sleeve (44) descends a distance that reaches a fourth threshold, the outer sleeve (44) moves to the bottom end of the reciprocating thread on the outer side of the reciprocating screw (42), and at the same time, the outer locking groove (75) cooperates with the inner locking groove (65) to complete the locking of the steel bar (12), and at this time, the drive motor (43) is stopped; S5, the through-type jack (22) drives its output shaft to move upward, and when the output shaft of the through-type jack (22) moves upward, the first limit plate (34) is pushed through the pulling tube (31) and the limit ring (32), and the first limit plate (34) pulls the end plate (61) through the pulling rod (33), and the end plate (61) pulls the steel bar (12) and the foundation pile (11) through a plurality of locking mechanisms (7), thereby realizing the pull-out test of the foundation pile (11); S6. After the test is completed, the through-type jack (22) drives its output shaft to move downward and reset, and then the drive motor (43) is started again. After the drive motor (43) is started, it continues to drive the reciprocating screw (42) to rotate. When the reciprocating screw (42) rotates, it drives the outer sleeve (44) to move upward and reset. During the upward movement of the outer sleeve (44), the second outer sleeve plate (51) drives multiple first trigger blocks (52) to move upward. After the first trigger block (52) moves upward, the push on the second trigger block (73) is gradually released. At this time, the stretched second reset spring (76) drives the locking plate (74) to move outward and reset. During the outward movement of the locking plate (74), the sliding rod (72) drives the second trigger block (73) to reset synchronously. S7, when the upward movement distance of the outer sleeve (44) reaches the fifth threshold value, the outer sleeve (44) arrives at the initial position, that is, the top of the reciprocating thread on the outer side of the reciprocating screw (42), and the driving motor (43) is stopped at this time.

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