Building pile foundation strength detection equipment

Abstract

The invention relates to the technical field of pile foundation strength detection, in particular to building pile foundation strength detection equipment which comprises an electric control box, a workbench is fixedly mounted at the top of the electric control box, a plurality of limiting mounting mechanisms used for bearing pile foundation core samples are evenly arranged at the top of the workbench, and a lifting mechanism is arranged on the rear side of the top of the workbench. The arc-shaped positioning seats and the pile foundation core samples are the same in appearance, primary positioning and clamping of the pile foundation core samples are achieved, the linkage compression joint assembly and the first arc-shaped pressing plate are fixed in a compression joint mode from top to bottom, secondary positioning and clamping of the pile foundation core samples are achieved, the same pile foundation core sample is equally divided into a plurality of sections to be placed in the arc-shaped positioning seats in the same row, and therefore the pile foundation core samples can be accurately positioned and clamped. Different pile foundation core samples are equally divided and then placed in the arc-shaped positioning seats in different rows, so that different depths of the same pile foundation core sample can be conveniently detected and compared at the same time, the same depths of the different pile foundation core samples are compared, the different pile foundation core samples are mutually compared, and the detection accuracy is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of pile foundation strength detection, and in particular relates to a building pile foundation strength detection device. Background Art

[0002] Building pile foundation is a deep foundation structure composed of pile body and bearing platform. It is mainly used to transfer the building load to deep stable soil or rock layer to ensure the safety and stability of the building. When the bearing capacity of the surface soil is insufficient and cannot directly support the weight of the building, pile foundation is usually used to bear the load. After the pouring production of the building pile foundation is completed, strength testing is required. Pile foundation strength testing includes core drilling method testing, static load test testing, high strain dynamic testing and low strain dynamic testing. Core drilling method testing is a more common method. When testing the drilled pile foundation core sample, the following problems exist:

[0003] 1. Building pile foundations in different usage scenarios have different strength requirements. When using the core drilling method to test the pile foundation strength, the drilled pile foundation core sample is divided into several equal parts. The divided pile foundation core samples are placed under a hydraulic press and the hydraulic press pressure head is used to perform a downward pressure test. The pressure is evenly applied until the pressure value corresponding to the strength required in the usage scenario is reached. After reaching the specified pressure value, the pressure is maintained for a period of time, and the pressure head is released to observe whether there are cracks and damages in the pile foundation. If it is intact, it means that the pile foundation strength meets the standard. If cracks and damages appear, it means that the pile foundation strength does not meet the standard. However, in order to ensure measurement accuracy, it is usually necessary to collect multiple points for the same building pile foundation. The collected pile foundation is usually divided into several equal parts for separate testing. However, the existing equipment can usually only test one pile foundation core sample at a time, so multiple tests are required, which is inefficient.

[0004] 2. When testing the strength of pile core samples, not only is it necessary to perform pressure testing along the axis of the pile core sample to test the axial strength of the pile core sample, but also when the pile foundation is subjected to uneven force or localized pressure, the pile foundation will be subjected to radial shear force, which requires testing the radial strength of the pile core sample. Existing equipment cannot test the axial and radial strength of the pile core sample at the same time.

[0005] 3. When conducting radial strength testing, the bottom of the pressing head is usually flat, and the contact area with the pile core sample is small, resulting in excessive local pressure on the pile core sample, reducing the accuracy of the test. Summary of the Invention

[0006] The purpose of the present invention is to provide a building pile foundation strength testing device with a simple structure and reasonable design in order to solve the above problems.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] A building pile foundation strength testing device includes an electric control box, a workbench is fixedly installed on the top of the electric control box, a number of limit installation mechanisms for supporting pile foundation core samples are evenly arranged on the top of the workbench, a lifting mechanism is arranged on the rear side of the top of the workbench, a frame is arranged on the lifting mechanism, a number of beams are evenly and fixedly connected to the bottom of the frame, the beams are grouped in pairs, and the front sides of the bottoms of the two beams in the same group are provided with radial strength testing mechanisms for testing the radial strength of the pile foundation core samples, and the rear sides of the bottoms of the two beams in the same group are provided with axial strength testing mechanisms for testing the axial strength of the pile foundation core samples.

[0009] The limiting installation mechanism includes a plurality of supporting legs fixedly installed on the top of the workbench in a rectangular shape. The supporting legs are grouped into groups of four, and a supporting plate is fixedly installed on the top of the four supporting legs in the same group. A plurality of No. 2 arc-shaped positioning seats are fixedly installed symmetrically on the left and right sides of the front side of the top of the supporting plate. The No. 2 arc-shaped positioning seats are grouped in twos, and the tops of the two No. 2 arc-shaped positioning seats in the same group jointly support the pile foundation core sample. A plurality of No. 1 arc-shaped positioning seats for holding the pile foundation core sample are fixedly installed on the rear side of the top of the supporting plate, and a plug is fixedly installed on the right side of the top of the No. 1 arc-shaped positioning seat.

[0010] Preferably, the lifting mechanism includes a U-shaped seat fixedly mounted on the rear side of the top of the workbench, a servo motor is fixedly mounted on the top center of the U-shaped seat, a screw rod is rotatably mounted inside the U-shaped seat, the top of the screw rod is fixedly connected to the bottom of the output end of the servo motor, the middle of the screw rod is threadedly connected to a lifting block through a ball nut, and a guide rod is fixedly mounted on the rear side of the inside of the U-shaped seat, and the lifting block and the guide rod are slidably connected.

[0011] Preferably, a No. 3 fixing plate is fixedly installed on the front side of the lifting block, the front side of the No. 3 fixing plate is fixedly connected to the rear side of the frame, and a reinforcing rib is fixedly connected between the lifting block and the No. 3 fixing plate.

[0012] Preferably, a top plate is fixedly installed at the top center of the frame, and the radial strength detection mechanism includes a No. 2 hydraulic cylinder fixedly installed at the bottom center of the top plate, a fixing frame is fixedly installed at the bottom of the output end of the No. 2 hydraulic cylinder, a number of connecting rods are evenly installed at the bottom of the fixing frame, and an arc-shaped pressure head for pressure testing the pile foundation core sample is fixedly installed at the bottom of the connecting rod.

[0013] Preferably, two No. 2 connecting plates are fixedly installed on the front bottom sides of the two beams in the same group, and a No. 2 fixing plate is commonly fixedly installed on the bottoms of the two No. 2 connecting plates in the same group. Several linkage crimping components for positioning and clamping the pile foundation core samples are symmetrically arranged on the two No. 2 fixing plates, and a positioning component is arranged on the linkage crimping component.

[0014] Preferably, the linkage crimping assembly includes a No. 2 arc-shaped pressure plate symmetrically fixedly installed on both sides of the No. 2 fixed plate, a fixed sleeve is fixedly installed at the top center of the No. 2 arc-shaped pressure plate, a fixed rod is movably passed through the inner center of the fixed sleeve, the bottom of the fixed rod slides through the bottom of the No. 2 arc-shaped pressure plate, and a stopper is fixedly sleeved on the upper and middle part of the fixed rod, a No. 2 spring is sleeved on the upper part of the fixed rod, and the No. 2 spring is arranged between the stopper and the inner wall of the top of the fixed sleeve, and the top of the fixed rod slides through the top of the fixed sleeve and is fixedly installed with a mounting block, and a steel rope is fixedly installed on the mounting block.

[0015] Preferably, the positioning assembly includes a slide rail fixedly mounted on the side wall of the No. 2 arc-shaped pressure plate, the slide rail is provided with a slide groove, a sliding block is slidably connected inside the slide groove, a fixed block is fixedly mounted on the top of the sliding block, the fixed block is fixedly connected to the end of the steel rope away from the mounting block, a No. 1 guide pulley is mounted on the top of the fixed sleeve, a No. 2 guide pulley is fixedly mounted on the side of the top of the slide rail close to the fixed sleeve, the No. 1 guide pulley and the No. 2 guide pulley jointly guide and limit the steel rope, a No. 1 spring is fixedly mounted inside the slide groove, and the No. 1 spring is arranged between the sliding block and the inner wall of the slide groove.

[0016] Preferably, a mounting plate is fixedly installed at the bottom of the sliding block, a nut block is fixedly installed on the side of the mounting plate away from the second arc-shaped pressure plate, a threaded rod passes through the center thread of the nut block, a positioning block is fixedly installed at one end of the threaded rod, and a handwheel is fixedly installed at the other end of the threaded rod.

[0017] Preferably, the axial strength detection mechanism includes two No. 1 connecting plates fixedly installed on the rear side of the bottom of the beam, and the No. 1 connecting plates are grouped in pairs and symmetrically distributed front to back. A No. 1 fixing plate is commonly fixedly installed on the bottom of the two No. 1 connecting plates in the same group, and two No. 1 arc-shaped pressure plates are symmetrically installed on both sides of the No. 1 fixing plate. A No. 1 hydraulic cylinder is commonly fixedly installed between the four No. 1 connecting plates on the two beams in the same group, and a No. 3 connecting plate is fixedly installed on the output end of the No. 1 hydraulic cylinder. Several mounting heads are fixedly installed on the bottom of the No. 3 connecting plate, and an extrusion head is fixedly installed on the side of the mounting head close to the No. 1 connecting plate.

[0018] Preferably, an inspection door is hinged on the front side of the electric control box, and self-locking universal wheels are fixedly installed on the four corners of the bottom of the electric control box.

[0019] The beneficial effects of the present invention are:

[0020] 1. The present invention realizes the primary positioning and clamping of the pile foundation core sample by making the arc-shaped positioning seat in the limiting installation mechanism identical to the shape of the pile foundation core sample, and realizes the secondary positioning and clamping of the pile foundation core sample by the top-down crimping and fixing of the linkage crimping assembly and the No. 1 arc-shaped pressure plate, thereby improving the clamping stability of the pile foundation core sample during testing, reducing shaking and slipping, and improving the accuracy of the test.

[0021] 2. The present invention divides the same pile foundation core sample into several equal sections and places them in the arc-shaped positioning seats in the same column. Different pile foundation core samples are divided and placed in the arc-shaped positioning seats in different rows. This facilitates the simultaneous detection and comparison of different depths of the same pile foundation core sample, and the comparison of the same depths of different pile foundation core samples, which serve as mutual reference, reducing detection errors and improving detection accuracy.

[0022] 3. The present invention detects the axial strength of the pile foundation core sample through an axial strength detection mechanism, and detects the radial strength of the pile foundation core sample using a radial strength detection mechanism, thereby realizing that a single device can simultaneously detect the radial strength and axial strength of the same pile foundation core sample, and obtain the test results at one time, with high work efficiency.

[0023] 4. When conducting radial strength testing of pile foundation core samples, the present invention adopts an arc-shaped indenter instead of a traditional flat indenter for testing, thereby expanding the contact area between the indenter and the pile foundation core sample, effectively simulating the surface stress conditions of the pile foundation core sample underground, and avoiding the problem of large detection errors caused by excessive local pressure caused by the flat indenter downward pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0025] Figure 2 It is a three-dimensional diagram of the workbench and the position limiting installation mechanism of the present invention;

[0026] Figure 3 It is a partial structural stereogram of the present invention;

[0027] Figure 4 is a perspective view of the frame and lifting mechanism of the present invention;

[0028] Figure 5 It is a stereoscopic diagram of the axial strength detection mechanism, frame and radial strength detection mechanism of the present invention;

[0029] Figure 6 is a three-dimensional diagram of the frame and radial strength detection mechanism of the present invention;

[0030] Figure 7 It is a partial cross-sectional view of the positioning assembly and the linked crimping assembly of the present invention;

[0031] Figure 8 It is a three-dimensional diagram of the axial strength detection mechanism and frame of the present invention.

[0032] In the figure: 1. Electric control box; 2. Workbench; 3. Axial strength testing mechanism; 31. Hydraulic cylinder No. 1; 32. Arc pressure plate No. 1; 33. Fixed plate No. 1; 34. Connecting plate No. 1; 35. Extrusion head; 36. Mounting head; 37. Connecting plate No. 3; 4. Frame; 5. Lifting mechanism; 51. Servo motor; 52. Fixed plate No. 3; 53. Reinforcement rib; 54. Lifting block; 55. Screw; 56. Guide rod; 57. U-shaped seat; 6. Radial strength testing mechanism; 61. Hydraulic cylinder No. 2; 62. Fixed frame; 63. Positioning assembly; 631. Spring No. 1; 632. Fixed block; 633. Sliding block; 634. Slide rail; 635 , threaded rod; 636, handwheel; 637, nut block; 638, mounting plate; 639, positioning block; 64, connecting plate No. 2; 65, linkage crimping assembly; 651, arc pressure plate No. 2; 652, fixing sleeve; 653, block; 654, spring No. 2; 655, fixing rod; 656, mounting block; 657, guide pulley No. 1; 658, steel rope; 659, guide pulley No. 2; 66, connecting rod; 67, arc pressure head; 68, fixing plate No. 2; 7, limit mounting mechanism; 71, plug; 72, support plate; 73, arc positioning seat No. 1; 74, arc positioning seat No. 2; 75, support leg; 8, top plate; 9, crossbeam. DETAILED DESCRIPTION

[0033] The present application is described in further detail below in conjunction with the accompanying drawings. It is necessary to point out that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technicians in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] Example: See Figure 1 and Figure 3 , a building pile foundation strength testing equipment, including an electric control box 1, a workbench 2 is fixedly installed on the top of the electric control box 1, and a number of limit installation mechanisms 7 for supporting the pile foundation core sample are evenly arranged on the top of the workbench 2, a lifting mechanism 5 is arranged on the rear side of the top of the workbench 2, and a frame 4 is arranged on the lifting mechanism 5, and a number of beams 9 are evenly fixedly connected to the bottom of the frame 4. The beams 9 are grouped in pairs, and the front sides of the bottoms of the two beams 9 in the same group are provided with radial strength testing mechanisms 6 for testing the radial strength of the pile foundation core sample, and the rear sides of the bottoms of the two beams 9 in the same group are provided with axial strength testing mechanisms 3 for testing the axial strength of the pile foundation core sample; an inspection door is hinged on the front side of the electric control box 1, and self-locking universal wheels are fixedly installed on the four corners of the bottom of the electric control box 1. A circuit board, a data processor, a data storage, a signal receiver, an industrial communication module, etc. are arranged inside the electric control box 1 for data processing, electrical equipment control, etc.

[0035] When in use, the self-locking universal wheel is used to move the equipment, the inspection door is used to inspect the inside of the electrical control box 1, the limit installation mechanism 7 is used to support and position the pile foundation core sample after equal division, the lifting mechanism 5 is used to realize the lifting and lowering of the frame 4, and the crossbeam 9 is used to fix the radial strength detection mechanism 6 and the axial strength detection mechanism 3. The axial strength detection mechanism 3 is used to perform axial strength detection on the pile foundation core sample, and the radial strength detection mechanism 6 is used to perform radial strength detection on the pile foundation core sample.

[0036] See also Figure 1 and Figure 2 The limiting mounting mechanism 7 includes a plurality of supporting legs 75 fixedly mounted on the top of the workbench 2 in a rectangular shape. The supporting legs 75 are grouped into groups of four. A supporting plate 72 is fixedly mounted on the top of the four supporting legs 75 in the same group. A plurality of No. 2 arc-shaped positioning seats 74 are fixedly mounted symmetrically on the front and left sides of the top of the supporting plate 72. The No. 2 arc-shaped positioning seats 74 are grouped in twos. The tops of the two No. 2 arc-shaped positioning seats 74 in the same group jointly support the pile foundation core sample. The middle bottom of the pile foundation core sample supported by the two No. 2 arc-shaped positioning seats 74 is in a suspended state, which is convenient for testing the strength of the pile foundation core sample when subjected to radial force. A plurality of No. 1 arc-shaped positioning seats 73 for holding the pile foundation core sample are fixedly mounted on the rear side of the top of the supporting plate 72, and a plug 71 is fixedly mounted on the right side of the top of the No. 1 arc-shaped positioning seat 73.

[0037] During use, drilling and material collection equipment is used to drill and collect materials along the axis direction of the building pile foundation. When collecting materials, materials need to be collected from the center and edge parts of the same building pile foundation. A symmetrical material collection method is adopted when collecting materials to achieve multi-point material collection, that is, the two core samples taken symmetrically have the same effect on the overall strength of the building pile foundation. The collected pile foundation core samples are divided into equal parts, and the end faces of the core samples are polished after the processing is completed. The multiple No. 2 arc-shaped positioning seats 74 and the multiple No. 1 arc-shaped positioning seats 73 on the same supporting plate 72 are in a row. Then, the equally divided samples of the same pile foundation core sample are placed in the No. 2 arc-shaped positioning seats 74 in the same column respectively to achieve strength testing of different depths of the same pile foundation core sample, and the symmetrically collected pile foundation core samples are placed in the corresponding No. 1 arc-shaped positioning seats 73 to facilitate the simultaneous detection of the radial strength and axial strength of the symmetrically collected pile foundation core samples. The No. 1 arc-shaped positioning seat 73 and the No. 2 arc-shaped positioning seat 74 are used to support, position and clamp the pile foundation core sample, thereby achieving a first-level clamping and fixation of the pile foundation core sample.

[0038] See also Figure 1 、 Figure 3 and Figure 4The lifting mechanism 5 includes a U-shaped seat 57 fixedly mounted on the top rear side of the workbench 2, a servo motor 51 is fixedly mounted on the top center of the U-shaped seat 57, a screw rod 55 is rotatably mounted inside the U-shaped seat 57, the top of the screw rod 55 is fixedly connected to the bottom of the output end of the servo motor 51, the middle part of the screw rod 55 is threadedly connected to the lifting block 54 through a ball nut, and a guide rod 56 is fixedly mounted on the rear side of the U-shaped seat 57, the lifting block 54 and the guide rod 56 are slidably connected, a No. 3 fixed plate 52 is fixedly mounted on the front side of the lifting block 54, the front side of the No. 3 fixed plate 52 is fixedly connected to the rear side of the frame 4, and a reinforcing rib 53 is fixedly connected between the lifting block 54 and the No. 3 fixed plate 52.

[0039] When the lifting mechanism 5 is in use, the servo motor 51 is started, and the output end of the servo motor 51 drives the screw rod 55 to rotate, synchronously driving the lifting block 54 and the third fixing plate 52 thereon to move downward, and at the same time driving the frame 4 and the axial strength detection mechanism 3 and the radial strength detection mechanism 6 thereon to move downward, realizing the top-down crimping fixation of the pile foundation core sample, realizing the secondary fixation of the pile foundation core sample, and improving the stability of the clamping.

[0040] See also Figure 1 、 Figure 5 and Figure 6 , a top plate 8 is fixedly installed at the top center of the frame 4, and a display (not shown in the figure) is installed on the top of the top plate 8 to display the applied pressure value. The radial strength detection mechanism 6 includes a No. 2 hydraulic cylinder 61 fixedly installed at the bottom center of the top plate 8, a fixing frame 62 is fixedly installed at the bottom of the output end of the No. 2 hydraulic cylinder 61, and a plurality of connecting rods 66 are evenly installed at the bottom of the fixing frame 62. An arc pressure head 67 for pressurizing the pile foundation core sample is fixedly installed at the bottom of the connecting rod 66. A pressure sensor (not shown in the figure) is provided on the arc pressure head 67. The pressure sensor is connected to The signal receiver inside the electric control box 1 establishes a data connection. Two No. 2 connecting plates 64 are fixedly installed on the front bottom sides of the two crossbeams 9 in the same group. A No. 2 fixing plate 68 is fixedly installed on the bottom of the two No. 2 connecting plates 64 in the same group. A number of linkage crimping components 65 for positioning and clamping the pile foundation core sample are symmetrically arranged on the two No. 2 fixing plates 68. The linkage crimping components 65 are grouped in twos and are symmetrically distributed on the left and right. The two linkage crimping components 65 in the same group jointly crimp and fix the pile foundation core sample, and a positioning component 63 is provided on the linkage crimping component 65.

[0041] See also Figure 6 and Figure 7The linkage crimping assembly 65 includes a No. 2 arc-shaped pressure plate 651 symmetrically fixedly installed on both sides of the No. 2 fixed plate 68. A fixed sleeve 652 is fixedly installed at the top center of the No. 2 arc-shaped pressure plate 651. A fixed rod 655 is movably penetrated by the inner center of the fixed sleeve 652. A ball is rolledly installed at the center of the lower end surface of the fixed rod 655. The bottom of the fixed rod 655 slides through the bottom of the No. 2 arc-shaped pressure plate 651, and a stopper 653 is fixedly sleeved on the upper and middle part of the fixed rod 655. A No. 2 spring 654 is sleeved on the upper part of the fixed rod 655. The No. 2 spring 654 is arranged between the stopper 653 and the inner wall of the top of the fixed sleeve 652. After the top of the fixed rod 655 slides through the top of the fixed sleeve 652, a mounting block 656 is fixedly installed, and a steel rope 658 is fixedly installed on the mounting block 656.

[0042] See also Figure 6 and Figure 7 The positioning assembly 63 includes a slide rail 634 fixedly mounted on the side wall of the second arc-shaped pressure plate 651, a slide groove is provided on the slide rail 634, a slide block 633 is slidably connected inside the slide groove, a fixed block 632 is fixedly mounted on the top of the slide block 633, the fixed block 632 is fixedly connected to the end of the steel rope 658 away from the mounting block 656, a first guide pulley 657 is fixedly mounted on the top of the fixed sleeve 652, a second guide pulley 659 is fixedly mounted on the side of the top of the slide rail 634 near the fixed sleeve 652, and the first guide pulley 657 and the second guide pulley 659 are fixedly mounted on the top of the slide rail 634 near the fixed sleeve 652. The guide pulleys 659 jointly guide and limit the steel rope 658. A spring 631 is fixedly installed inside the slide groove. The spring 631 is set between the sliding block 633 and the inner wall of the slide groove. A mounting plate 638 is fixedly installed at the bottom of the sliding block 633. A nut block 637 is fixedly installed on the side of the mounting plate 638 away from the No. 2 arc-shaped pressure plate 651. A threaded rod 635 passes through the center thread of the nut block 637. A positioning block 639 is fixedly installed at one end of the threaded rod 635, and a handwheel 636 is fixedly installed at the other end of the threaded rod 635.

[0043] When in use, when the lifting mechanism 5 drives the frame 4 and the crossbeam 9 thereon to move downward, it also drives the No. 2 connecting plate 64 and the No. 2 fixing plate 68 thereon to move downward, and then drives the No. 2 arc-shaped pressing plate 651 to move downward, and the No. 2 arc-shaped pressing plate 651 is used to press and fix the pile foundation core sample from top to bottom, thereby realizing the secondary clamping and fixing of the pile foundation core sample. At the same time, when the No. 2 arc-shaped pressing plate 651 moves downward, the bottom of the fixing rod 655 first contacts the pile foundation core sample, and as the No. 2 arc-shaped pressing plate 651 continues to descend, it drives the fixing rod 655 and the stopper 653 thereon to move upward. The second spring 654 is compressed synchronously, and the mounting block 656 and one end of the steel rope 658 thereon are driven to move upward, and the fixed block 632 is pulled synchronously, and the sliding block 633 and the mounting plate 638 thereon are driven to move toward the second arc-shaped pressure plate 651, and the nut block 637 and the threaded rod 635 thereon are driven to move toward the second arc-shaped pressure plate 651, and then the positioning block 639 is driven synchronously to move toward the second arc-shaped pressure plate 651, and the positioning blocks 639 on both sides are used to squeeze the pile foundation core sample in the center, so as to realize the center positioning of the pile foundation core sample. In order to facilitate the subsequent radial strength test, the position of the positioning block 639 can be adjusted by rotating the hand wheel 636, so that the position of the positioning block 639 can be adjusted according to the length of the pile core sample. The ball provided at the bottom of the fixing rod 655 ensures that when the fixing rod 655 is pressed down, the positioning block 639 can push the pile core sample to the center. After the pile core sample is stably clamped by the second arc-shaped pressure plate 651, the second hydraulic cylinder 61 is started at this time. The output end of the second hydraulic cylinder 61 drives the fixing frame 62 and the connecting rod 66 thereon to move downward, and at the same time drives the arc pressure head 67 to squeeze downward, and the second hydraulic cylinder 61 is used to fix the pile core sample. The arc-shaped pressure head 67 squeezes the pile foundation core sample until the pressure value transmitted to the display by the pressure sensor reaches the pressure value required for the test. At this time, the pressure is maintained, and the crimping is subsequently released to observe whether the pile foundation core sample is cracked or damaged. This can determine whether the strength of the pile foundation core sample meets the standard. The radial strength detection mechanism 6 simultaneously performs radial strength detection on different depths of the same pile foundation core sample, and the radial strength detection mechanism 6 performs radial strength detection on different pile foundation core samples, which is conducive to obtaining the radial strength of different areas of the building pile foundation. The test results are compared with each other to reduce experimental errors.

[0044] See also Figure 1 and Figure 8The axial strength detection mechanism 3 includes two No. 1 connecting plates 34 fixedly installed on the rear side of the bottom of the beam 9. The No. 1 connecting plates 34 are grouped in pairs and are symmetrically distributed front to back. A No. 1 fixing plate 33 is fixedly installed on the bottom of the two No. 1 connecting plates 34 in the same group. Two No. 1 arc-shaped pressure plates 32 are symmetrically installed on both sides of the No. 1 fixing plate 33. Steel balls are provided at the bottom of the No. 1 arc-shaped pressure plate 32. The steel balls are used to reduce the friction between the No. 1 arc-shaped pressure plate 32 and the pile foundation core sample. A No. 1 hydraulic cylinder 31 is fixedly installed between the four No. 1 connecting plates 34 on the two beams 9 in the same group. A No. 3 connecting plate 37 is fixedly installed on the output end of the No. 1 hydraulic cylinder 31. A number of mounting heads 36 are fixedly installed on the bottom of the No. 3 connecting plate 37. An extrusion head 35 is fixedly installed on the side of the mounting head 36 close to the No. 1 connecting plate 34. A pressure sensor (not shown in the figure) is provided on the extrusion head 35.

[0045] When the lifting mechanism 5 drives the frame 4 and the crossbeam 9 thereon to move downward, the lifting mechanism 5 drives the No. 1 connecting plate 34 and the No. 1 fixing plate 33 thereon to move downward, and synchronously drives the No. 1 arc pressing plate 32 to move downward, and the pile foundation core sample is pressed and fixed from top to bottom by the No. 1 arc pressing plate 32. During pressing, the steel ball on the No. 1 arc pressing plate 32 is in contact with the top of the pile foundation core sample, ensuring the secondary clamping and fixing of the pile foundation core sample. After stable clamping, the No. 1 hydraulic cylinder 31 is started, and the output end of the No. 1 hydraulic cylinder 31 contracts, driving the No. 3 connecting plate 37 and the mounting head 36 thereon to move toward the No. 1 hydraulic cylinder 31, synchronously driving the extrusion head 35 to move toward the No. 1 hydraulic cylinder 31, and using the extrusion head 35 to squeeze the pile foundation core sample. One end of the pile foundation core sample contacts the plug 71, and continuously pressurizes until the pressure value reaches the pressure value corresponding to the required strength for detection. After pressure maintenance, if the pile foundation core sample is not damaged, it means that the pile foundation strength meets the standard. Otherwise, it means that it does not meet the standard.

[0046] It should be noted that, when using this kind of building pile foundation strength testing equipment, the pile foundation core sample is taken symmetrically, first the taken pile foundation core sample is divided into equal parts, after the processing is completed, the end face of the core sample is polished, then the equally divided samples of the same pile foundation core sample are placed in the No. 2 arc-shaped positioning seat 74 of the same column, the symmetrically taken pile foundation core sample is placed in the corresponding No. 1 arc-shaped positioning seat 73, the pile foundation core sample is supported and limited by the limit installation mechanism 7, and the first-level positioning and clamping of the pile foundation core sample is realized, then the servo motor 51 in the lifting mechanism 5 is started, and the lifting mechanism 5 is used to drive the frame 4 and the radial strength testing mechanism 6 thereon to move downward, and synchronously drive the axial strength testing mechanism 3 to move downward, and use the No. 1 arc pressure plate 32 in the axial strength testing mechanism 3 and the radial strength testing mechanism 6 The No. 2 arc-shaped pressure plate 651 presses and fixes the pile foundation core sample from top to bottom, realizing the secondary positioning and clamping of the pile foundation core sample, improving the clamping stability of the pile foundation core sample, and ensuring the stability of the test. After stable clamping, the axial strength detection mechanism 3 is used to detect the axial strength of the pile foundation core sample, and the radial strength detection mechanism 6 is used to detect the radial strength of the pile foundation core sample. After the radial strength detection and the axial strength detection are completed, the clamping is released, and the pile foundation core samples after detection are observed one by one to see if there are cracks and damage. If there are cracks and damage, it means that the strength of the pile foundation core sample does not meet the standard. Otherwise, it means that it meets the standard. A single device is used to perform axial and radial strength tests at the same time, and the pile foundation core samples of different depths and positions of the same pile foundation core sample are detected at the same time and compared with each other. The detection error is small and the accuracy is high.

[0047] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, and all such variations and improvements fall within the scope of protection of the present invention.

Claims

1. A building pile foundation strength testing device, comprising an electric control box (1), characterized in that: A workbench (2) is fixedly mounted on the top of the electric control box (1), and a plurality of position-limiting mounting mechanisms (7) for supporting the pile foundation core sample are evenly arranged on the top of the workbench (2). A lifting mechanism (5) is arranged on the rear side of the top of the workbench (2), and a frame (4) is arranged on the lifting mechanism (5). A plurality of crossbeams (9) are fixedly connected to the bottom of the frame (4), and the crossbeams (9) are arranged in groups of two. A radial strength detection mechanism (6) for detecting the radial strength of the pile foundation core sample is arranged on the front side of the bottom of the two crossbeams (9) in the same group, and an axial strength detection mechanism (3) for detecting the axial strength of the pile foundation core sample is arranged on the rear side of the bottom of the two crossbeams (9) in the same group. The position limiting mounting mechanism (7) comprises a plurality of supporting legs (75) fixedly mounted on the top of the workbench (2) in a rectangular shape, the supporting legs (75) being arranged in a group of four, and a supporting plate (72) being fixedly mounted on the top of the four supporting legs (75) in the same group, and a plurality of No. 2 arc-shaped positioning seats (74) being fixedly mounted on the front side of the top of the supporting plate (72) in a symmetrical manner, the No. 2 arc-shaped positioning seats (74) being arranged in pairs, and the tops of the two No. 2 arc-shaped positioning seats (74) in the same group jointly supporting a pile foundation core sample, and a plurality of No. 1 arc-shaped positioning seats (73) for holding the pile foundation core sample being fixedly mounted on the rear side of the top of the supporting plate (72), and a plug (71) being fixedly mounted on the right side of the top of the No. 1 arc-shaped positioning seat (73).

2. A building pile foundation strength testing device according to claim 1, characterized in that: The lifting mechanism (5) comprises a U-shaped seat (57) fixedly mounted on the rear side of the top of the workbench (2); a servo motor (51) is fixedly mounted at the center of the top of the U-shaped seat (57); a screw rod (55) is rotatably mounted inside the U-shaped seat (57); the top of the screw rod (55) is fixedly connected to the bottom of the output end of the servo motor (51); a lifting block (54) is threadedly connected to the middle of the screw rod (55) via a ball nut; a guide rod (56) is fixedly mounted on the rear side of the U-shaped seat (57); and the lifting block (54) and the guide rod (56) are slidably connected.

3. A building pile foundation strength testing device according to claim 2, characterized in that: A third fixing plate (52) is fixedly mounted on the front side of the lifting block (54), the front side of the third fixing plate (52) is fixedly connected to the rear side of the frame (4), and a reinforcing rib (53) is fixedly connected between the lifting block (54) and the third fixing plate (52).

4. The building pile foundation strength testing device according to claim 1, characterized in that: A top plate (8) is fixedly mounted at the top center of the frame (4); a radial strength detection mechanism (6) comprises a No. 2 hydraulic cylinder (61) fixedly mounted at the bottom center of the top plate (8); a fixing frame (62) is fixedly mounted at the bottom of the output end of the No. 2 hydraulic cylinder (61); a plurality of connecting rods (66) are evenly mounted at the bottom of the fixing frame (62); and an arc-shaped pressure head (67) for performing a pressure test on a pile foundation core sample is fixedly mounted at the bottom of the connecting rods (66).

5. A building pile foundation strength testing device according to claim 4, characterized in that: Two No. 2 connecting plates (64) are fixedly installed on the front sides of the bottoms of the two crossbeams (9) in the same group. A No. 2 fixing plate (68) is fixedly installed on the bottoms of the two No. 2 connecting plates (64) in the same group. A plurality of linkage pressing assemblies (65) for positioning and clamping the pile foundation core sample are symmetrically arranged on the two No. 2 fixing plates (68). A positioning assembly (63) is arranged on the linkage pressing assemblies (65).

6. The building pile foundation strength testing device according to claim 5, characterized in that: The linkage crimping assembly (65) includes a second arc-shaped pressure plate (651) fixedly mounted on both sides of the second fixed plate (68) in a left-right symmetrical manner. A fixed sleeve (652) is fixedly mounted at the top center of the second arc-shaped pressure plate (651). A fixed rod (655) is movably penetrated through the inner center of the fixed sleeve (652). The bottom of the fixed rod (655) slides through the bottom of the second arc-shaped pressure plate (651). A stopper (653) is fixedly sleeved on the upper middle part of the fixed rod (655). A second spring (654) is sleeved on the upper part of the fixed rod (655). The second spring (654) is arranged between the stopper (653) and the inner wall of the top of the fixed sleeve (652). After the top of the fixed rod (655) slides through the top of the fixed sleeve (652), a mounting block (656) is fixedly mounted. A steel rope (658) is fixedly mounted on the mounting block (656).

7. The building pile foundation strength testing device according to claim 6, characterized in that: The positioning assembly (63) includes a slide rail (634) fixedly mounted on the side wall of the second arc-shaped pressure plate (651), a slide groove is provided on the slide rail (634), a sliding block (633) is slidably connected inside the slide groove, a fixed block (632) is fixedly mounted on the top of the sliding block (633), the fixed block (632) is fixedly connected to the end of the steel rope (658) away from the mounting block (656), a first guide pulley (657) is mounted on the top of the fixed sleeve (652), a second guide pulley (659) is fixedly mounted on the side of the top of the slide rail (634) close to the fixed sleeve (652), the first guide pulley (657) and the second guide pulley (659) jointly guide and limit the steel rope (658), a first spring (631) is fixedly mounted inside the slide groove, and the first spring (631) is arranged between the sliding block (633) and the inner wall of the slide groove.

8. The building pile foundation strength testing device according to claim 7, characterized in that: A mounting plate (638) is fixedly mounted on the bottom of the sliding block (633), a nut block (637) is fixedly mounted on the side of the mounting plate (638) away from the second arc-shaped pressure plate (651), a threaded rod (635) is passed through the center thread of the nut block (637), a positioning block (639) is fixedly mounted on one end of the threaded rod (635), and a hand wheel (636) is fixedly mounted on the other end of the threaded rod (635).

9. The building pile foundation strength testing equipment according to claim 1, characterized in that: The axial strength detection mechanism (3) comprises two No. 1 connecting plates (34) fixedly mounted on the rear side of the bottom of the crossbeam (9), the No. 1 connecting plates (34) are arranged in pairs and are symmetrically distributed front to back, a No. 1 fixing plate (33) is fixedly mounted on the bottom of the two No. 1 connecting plates (34) in the same group, two No. 1 arc-shaped pressing plates (32) are symmetrically mounted on both sides of the No. 1 fixing plate (33), a No. 1 hydraulic cylinder (31) is fixedly mounted between the four No. 1 connecting plates (34) on the two crossbeams (9) in the same group, a No. 3 connecting plate (37) is fixedly mounted on the output end of the No. 1 hydraulic cylinder (31), a plurality of mounting heads (36) are fixedly mounted on the bottom of the No. 3 connecting plate (37), and an extrusion head (35) is fixedly mounted on the side of the mounting head (36) close to the No. 1 connecting plate (34).

10. The building pile foundation strength testing equipment according to claim 1, characterized in that: The front side of the electric control box (1) is hinged with an inspection door, and the four corners of the bottom of the electric control box (1) are respectively fixedly mounted with self-locking universal wheels.

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