CN113818498A

CN113818498A - Multidirectional pseudo-static test device for building ground structure and pile foundation composite stress body

Info

Publication number: CN113818498A
Application number: CN202111164661.4A
Authority: CN
Inventors: 高振华
Original assignee: Hebei University of Technology
Current assignee: Hebei University of Technology
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2021-12-21
Anticipated expiration: 2041-09-30
Also published as: CN113818498B

Abstract

The invention discloses a multidirectional pseudo-static test device for a building ground structure and pile foundation composite stress body, which belongs to the technical field of building mechanisms and comprises a base, wherein the surface of the base is fixedly connected with a bottom external force application simulation structure, and the surface of the bottom external force application simulation structure is provided with a multidirectional pseudo-static test simulation mechanism; the external application of force analog structure in bottom includes test bench, motor one, motor two and telescopic machanism one, test bench fixed connection is on the surface of base, the top fixed surface of test bench is connected with motor one, the axis of rotation of motor one is rotated and is connected with control shaft one, and this scheme can carry out the simulation to analog mechanism when multidirectional pseudo-static test, carries out the arbitrary big or small application of force simulation in arbitrary position from upper portion or lower part to improve the accuracy nature of experimental data acquisition, and can control the stability of analog structure at the skew in certain extent within range or the skew in arbitrary position.

Description

Multidirectional pseudo-static test device for building ground structure and pile foundation composite stress body

Technical Field

The invention relates to the technical field of building mechanisms, in particular to a multidirectional pseudo-static test device for a building ground structure and pile foundation composite stress body.

Background

The pseudo-static test is also called a low-cycle repeated load test, and refers to a static test for applying repeated reciprocating circulation action on a structure or a structural member, and is a process for repeatedly loading and unloading the structure or the structural member in positive and negative directions, so as to simulate the stress characteristics and deformation characteristics of the structure in the reciprocating vibration during earthquake. This method uses a static method to determine the effect of the structure when it vibrates, and is therefore called a pseudo-static test, or pseudo-static test.

Through retrieval, Chinese patent No. CN202110108761.9 discloses a multidirectional pseudo-static test device for a composite stress body of an upper structure and a pile foundation, which comprises a test model for simulating the composite stress body of the upper structure and the pile foundation, a force application device for loading acting force to the test model, and a static direction adjusting device for adjusting an included angle between a reference base plane of the test model and the acting force direction of the force application device; the test model comprises a geotechnical box, wherein piles are arranged in the geotechnical box, bearing platforms are arranged on the piles, and upper structures fixedly connected with the bearing platforms are arranged on the bearing platforms; the force application device comprises a horizontal actuator; the static force direction adjusting device comprises a horizontal rotary table; the horizontal actuator applies horizontal force to the superstructure, and the force applying device or the geotechnical box is arranged on the horizontal turntable.

The main technical problems solved by the device are as follows: the method is based on the improvement of the existing one-way pseudo-static experiment model device of the pile-bearing platform-soil composite stress body, and realizes the multi-way pseudo-static experiment to better simulate the actual stress condition. When the steel pipe is connected with the bearing platform, the bidirectional pseudo-static loading of the pile-bearing platform-soil composite stress body can be realized, and the steel pipe is replaced by the concrete column, so that the bidirectional pseudo-static loading of the superstructure-bearing platform-pile-soil composite stress body can be realized.

However, in the actual operation process, although the pile body, the base platform and the building structure body can be stressed in any direction, the overall structure height of the pile body, the base platform and the building structure body is long, and the simulation of external force application only from the top has limitation.

Disclosure of Invention

The invention aims to provide a multidirectional pseudo-static test device for a building ground structure and pile foundation composite stress body, and aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a multidirectional pseudo-static test device for a building ground structure and pile foundation composite stress body comprises a base, wherein the surface of the base is fixedly connected with a bottom external force application simulation structure, and a multidirectional pseudo-static test simulation mechanism is arranged on the surface of the bottom external force application simulation structure;

the bottom external force application simulation structure comprises a test bed, a first motor, a second motor and a first telescopic mechanism, wherein the test bed is fixedly connected to the surface of the base, the top end surface of the test bed is fixedly connected with the first motor, a rotating shaft of the first motor is rotatably connected with a first control shaft, the first control shaft is inserted into the test bed and penetrates through the test bed to be rotatably connected with a turntable, and the turntable is installed on the surface of the test bed;

the multidirectional pseudo-static test simulation mechanism comprises a box body, a pile body, a base station and a building structure body, wherein the box body is arranged on the surface of a rotary table, six groups of circumferentially distributed openings are formed in the surface of the box body, a diaphragm is fixedly connected in each group of openings, soil is filled in the box body, the pile body is inserted in the center of the soil, a pressure sensor is fixedly connected to the surface of the pile body, the base station is fixedly connected to the top end of the pile body, and the building structure body is fixedly connected to the top end of the base station;

the surface of the test bed is fixedly connected with an annular slide rail, an annular slide block is inserted into the annular slide rail, the surface of the annular slide block is provided with insections, the annular slide block is meshed with a first control gear, the first control gear is installed in a connecting shaft, and the connecting shaft is in transmission connection with a second control shaft installed on a rotating shaft of a second motor through a gearbox;

the surface of the annular sliding block is fixedly connected with a first fixing rod, the top end of the first fixing rod is fixedly connected with a first fixing plate, the surface of the first fixing plate is provided with a first telescopic mechanism, and a pressing block is arranged on the first telescopic mechanism.

Preferably, the surface of test bench is provided with two sets of concentric annular spouts, the bottom surface of carousel is provided with two sets of concentric annular mounting grooves, the spout on test bench surface and the mounting groove looks adaptation of carousel bottom surface, all insert in the mounting groove that carousel bottom surface set up and be equipped with ball one.

Preferably, the bottom surface of the box body is provided with a convex block, threaded holes which are distributed circumferentially are formed in the convex block, and the box body is fixed on the rotary table through a second fixing bolt.

Preferably, the annular slide rail is installed on the surface of the test bed through a first fixing bolt, and the bottom end surface of the annular slide block is provided with installation holes distributed circumferentially and balls II are installed in the installation holes.

Preferably, the first telescopic mechanism is a hydraulic cylinder or an electric telescopic rod, and one end of the mounting rod is fixedly connected to the mounting frame.

Preferably, the pressing block and the diaphragm are at the same horizontal height, and the pressing block is arranged to be hemispherical.

Preferably, pile body, base station and building structure as an organic whole, pile body, base station and building structure form for concrete placement or steel construction welding, pressure sensors set up to three groups and fix respectively in the top, the center and the bottom position of pile body.

Preferably, the surface of the base is fixedly connected with an installation frame, and the surface of the installation frame is provided with a top external force application simulation structure;

the top external force application simulation structure comprises a motor III, a bearing seat and a telescopic mechanism II, wherein the bearing seat is installed above a multidirectional pseudo-static force test simulation mechanism on the surface of a mounting frame, a limiting rod is inserted in the bearing seat, a limiting sleeve is fixedly connected to the bottom end of the limiting rod, a limiting ball is inserted in the limiting sleeve, a connecting rod is fixedly connected to the bottom end of the limiting ball, a fixer is fixedly connected to the bottom end of the connecting rod, and the fixer is installed on a building structure body.

Preferably, a third motor is fixedly connected to one side, located on the bearing seat, of the surface of the mounting frame, a third control shaft is rotatably connected to a rotating shaft of the third motor, and the third control shaft is inserted into the mounting frame and fixedly connected with a second control gear through the mounting frame;

the bottom end surface of the mounting frame is fixedly connected with a mounting seat which is positioned on the outer side of the bearing seat, a driving gear is inserted into the mounting seat, the bottom end surface of the driving gear is fixedly connected with a second fixing rod, the bottom end surface of the second fixing rod is fixedly connected with a second fixing plate, the surface of the second fixing plate is fixedly connected with a second telescopic mechanism, and the second telescopic mechanism is mounted on the push block;

the surface of the connecting rod is provided with a fixing ring through a supporting rod, and the fixing ring and the push block are positioned at the same horizontal height;

and the second telescopic mechanism is a hydraulic cylinder or an electric telescopic rod.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the scheme, the box body is filled with soil, the pile body is inserted into the box body, the base station and the building structure body are fixedly connected to the top end of the pile body and are of an integral structure, the multidirectional pseudo-static simulation test of the pile body, the base station and the building structure body can be carried out in the box body, the box body is arranged on the rotary table, the rotary table is connected with the control shaft through the operation of the motor and driven to rotate, the box body arranged on the surface of the rotary table is synchronously rotated, further, the soil in the box body generates centrifugal force in the rotating process, so that the surface of the pile body is extruded and applied with force, three groups of pressure sensors arranged on the surface of the pile body can receive the stress conditions of all parts of the surface of the pile body, the acquisition of simulation data of the multidirectional pseudo-static test is carried out, and meanwhile, the three groups of pressure sensors are respectively arranged at the topmost position, the central position and the bottommost position of the surface of the pile body, the method is used for sensing the whole stress condition of the surface of the pile body, so that the accuracy of data acquisition of the multi-directional pseudo-static simulation test is improved;

2. according to the scheme, when the pile body is acted by the centrifugal force of soil in the box body, the pile body, the base station and the building structure body are of an integrated structure, so that the base station and the building structure body can be influenced by the force, and the simulation data acquisition can be carried out on the multidirectional pseudo-static test of the base station and the building structure body by installing the force sensing elements on the surfaces of the base station and the building structure body;

3. according to the scheme, the opening is formed in the surface of the box body, the diaphragm is installed in the opening, the pressing block is driven to stretch through the first stretching mechanism, so that the pressing block can be abutted to the surface of the diaphragm, the diaphragm is pushed to be inserted into the box body, the diaphragm extrudes soil in the box body, force generated by pushing of the soil is further applied to the pile body, and the force application size of the pressing block can be controlled, so that the acquisition accuracy of simulation data of a multidirectional pseudo-static test is improved;

4. according to the scheme, the bottom end of the annular sliding rail is fixedly connected to the fixer, the fixer is connected with the limiting ball through the connecting rod and is inserted into the limiting sleeve, and the limiting ball can rotate or swing in any direction in the limiting sleeve, so that when the multidirectional pseudo-static test simulation mechanism is subjected to bottom external force application simulation structure to carry out multidirectional pseudo-static test, the building structure body cannot be tilted no matter the building structure body is deflected in any direction;

5. according to the scheme, the limiting rod is connected with the limiting sleeve and inserted into the bearing seat, so that an integrated structure consisting of the building structure body, the base station and the pile body can be vertically offset in a small range, and the inaccuracy of data acquired in a multidirectional pseudo-static test is avoided;

6. this scheme is connecting control gear two through three operation drive control shafts of motor three and is rotating, make two meshing drive gears of control gear rotate, it can drive two rotations of telescopic machanism to rotate through drive gear, make the ejector pad of installation on the telescopic machanism two can carry out the regulation of arbitrary angle on solid fixed ring surface, two drive ejector pads of rethread telescopic machanism slide, make the ejector pad can promote solid fixed ring and connect spacing ball and swing in spacing cover, thereby realize carrying out the application of force simulation on the upper portion of multidirectional pseudo-static test simulation mechanism structure, carry out multidirectional pseudo-static test's data acquisition again, improve data acquisition's variety.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic front view of the structure of the present invention;

FIG. 3 is a schematic side view of the structure of the present invention;

FIG. 4 is a schematic cross-sectional view taken along the line A-A of FIG. 3 according to the present invention;

FIG. 5 is a schematic structural view of a bottom external force application simulation structure according to the present invention;

FIG. 6 is a schematic structural diagram of a bottom external force application simulation structure according to the present invention;

FIG. 7 is a schematic structural diagram of a bottom external force application simulation structure according to the present invention;

FIG. 8 is an exploded view of a portion of the bottom external force application simulation structure of the present invention;

FIG. 9 is an exploded view of a portion of the bottom external force application simulation structure of the present invention;

FIG. 10 is an exploded view of a multidirectional pseudo-static test simulation mechanism according to the present invention;

FIG. 11 is a schematic structural diagram of a top external force application simulation structure according to the present invention;

FIG. 12 is an exploded view of the top external force application simulation structure of the present invention;

FIG. 13 is an enlarged view of the structure at B in FIG. 4 according to the present invention;

FIG. 14 is an enlarged view of the structure at C in FIG. 4 according to the present invention.

In the figure: 1. a base; 2. a bottom external force application simulation structure; 201. a test bed; 202. a first motor; 203. a first control shaft; 204. a turntable; 205. a first ball; 206. fixing a first bolt; 207. an annular slide rail; 208. an annular slider; 209. a second ball bearing; 210. a second motor; 211. a second control shaft; 212. a gearbox; 213. a connecting shaft; 214. controlling a first gear; 215. mounting a rod; 216. fixing a rod I; 217. a first fixing plate; 218. a first telescopic mechanism; 219. briquetting; 3. a multidirectional pseudo-static test simulation mechanism; 301. a box body; 302. fixing a second bolt; 303. a diaphragm; 304. a pile body; 305. a pressure sensor; 306. a base station; 307. a building structure; 4. a mounting frame; 5. a top external force application simulation structure; 501. a third motor; 502. a third control shaft; 503. a second control gear; 504. a bearing seat; 505. a limiting rod; 506. a limiting sleeve; 507. a limiting ball; 508. a connecting rod; 509. a holder; 510. a mounting seat; 511. a drive gear; 512. a second fixing rod; 513. a second fixing plate; 514. a second telescopic mechanism; 515. a push block; 516. a support bar; 517. and (4) fixing the ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10, and fig. 12, the present invention provides a technical solution:

a multi-directional pseudo-static test device for a building ground structure and pile foundation composite stress body is characterized in that a bottom external force application simulation structure 2 is fixed on a base 1, and a multi-directional pseudo-static test simulation mechanism 3 is installed on the bottom external force application simulation structure 2 and used for multi-directional pseudo-static tests;

the multidirectional pseudo-static test simulation mechanism 3 comprises a box body 301, a pile body 304, a pressure sensor 305, a base station 306 and a building structure body 307, wherein the box body 301 is set to be barrel-shaped, a bump is arranged on the surface of the bottom end of the box body 301, threaded holes which are distributed in a circumferential mode at equal intervals are formed in the surface of the bump arranged on the surface of the bottom end of the box body 301, the box body 301 is installed on a turntable 204 through a second fixing bolt 302, meanwhile, soil is filled in the box body 301 and is compressed, the pile body 304 is inserted in the center position of the soil in the box body 301, the top end of the pile body 304 is fixedly connected with the base station 306, the top end of the base station 306 is fixedly connected with the building structure body 307, the base station 306 needs to be kept at the upper layer and the surface position of the soil in the box body 301, and the multidirectional pseudo-static test is simulated through the pile body 304, the base station 306 and the building structure body 307;

the surface of the pile body 304 is provided with three groups of pressure sensors 305, and the three groups of pressure sensors 305 are respectively arranged at the topmost position, the central position and the bottommost position of the surface of the pile body 304 and are used for sensing the overall stress condition of the surface of the pile body 304;

the pile body 304, the base 306 and the building structure 307 are of an integral structure and can be formed by casting concrete or welding steel structures;

the box body 301 is installed on the turntable 204 through a second fixing bolt 302, the turntable 204 is installed on the test bed 201, two groups of annular sliding grooves are formed in the surface of the test bed 201, two groups of annular installing grooves are also formed in the bottom end surface of the turntable 204, the positions of the installing grooves are matched with the sliding grooves formed in the surface of the test bed 201, a first ball 205 is arranged in the installing groove formed in the bottom end surface of the turntable 204, the turntable 204 can rotate on the surface of the test bed 201 through the first ball 205, the rotating friction force is small, and the test bed 201 can rotate stably;

meanwhile, a first motor 202 is installed on the surface of the bottom end of the test bed 201, a first control shaft 203 is rotatably connected to a rotating shaft of the first motor 202, the first control shaft 203 is inserted into the test bed 201, the first control shaft 203 penetrates through the test bed 201 to be rotatably connected with the turntable 204, the first motor 202 operates to drive the first control shaft 203 to connect the turntable 204 to rotate, so that the box 301 installed on the surface of the turntable 204 synchronously rotates, further, soil in the box 301 generates centrifugal force in the rotating process, the surface of the pile body 304 is extruded and applied with force, three groups of pressure sensors 305 installed on the surface of the pile body 304 can receive the stress conditions on all parts of the surface of the pile body 304, and therefore, simulation data of a multidirectional pseudo-static test are collected;

when the pile body 304 is acted by the centrifugal force of soil in the box body 301, the pile body 304, the base 306 and the building structural body 307 are integrated, so that the base 306 and the building structural body 307 can be influenced by the force, and the multi-directional pseudo-static test of the base 306 and the building structural body 307 can be subjected to analog data acquisition by installing force sensing elements on the surfaces of the base 306 and the building structural body 307;

meanwhile, an annular slide rail 207 is installed on the surface of the test bed 201 through a first fixing bolt 206, an annular slide block 208 is inserted into the annular slide rail 207, the annular slide block 208 is of an annular structure, the radius of the annular slide block 208 is larger than that of the test bed 201, two balls 209 are installed in circumferentially distributed installation holes which are formed in the bottom end surface of the annular slide block 208, the annular slide block 208 can rotate on the surface of the annular slide rail 207 through the arrangement of the two balls 209, the rotating friction force is reduced, and the annular slide block 208 rotates stably;

a first fixing rod 216 is fixedly connected to the surface of the annular sliding block 208, a first fixing plate 217 is fixedly connected to the top end of the first fixing rod 216, a first telescopic mechanism 218 is mounted on the surface of the first fixing plate 217, and a pressing block 219 is mounted on the first telescopic mechanism 218;

meanwhile, the surface of the annular sliding block 208 is provided with insections, one side of the annular sliding block 208 is provided with a first control gear 214 which is meshed and connected with the annular sliding block 208, the first control gear 214 is arranged on a connecting shaft 213, and the connecting shaft 213 is in transmission connection with a second control shaft 211 arranged on a rotating shaft of a second motor 210 through a gearbox 212;

the second motor 210 is arranged on the surface of the base 1, and the gearbox 212 is arranged on the surface of the mounting frame 4 through a mounting rod 215;

the second motor 210 operates to drive the second control shaft 211 to be in transmission connection with the connecting shaft 213, so that the connecting shaft 213 can drive the first control gear 214 to rotate, and the first control gear 214 is meshed with the annular slide block 208 to rotate, so that the first surface-mounted telescopic mechanism 218 is driven to rotate, the first telescopic mechanism 218 can further rotate to any position outside the box body 301, the first telescopic mechanism 218 drives the pressing block 219 to stretch and retract, so that the pressing block 219 is pressed against the surface of the box body 301, six groups of holes which are distributed circumferentially are arranged on the surface of the box body 301 and at the same horizontal height of the pressing block 219, and the inside of the hole is fixedly connected with a diaphragm 303, so that the pressing block 219 can be abutted against the surface of the diaphragm 303, the membrane 303 is pushed to be inserted into the box body 301, so that the membrane 303 extrudes soil in the box body 301, and the soil is further pushed to generate force to act on the pile body 304, and the acquisition accuracy of simulation data of the multi-directional pseudo-static test is improved;

the position of the first telescopic mechanism 218 can be adjusted, so that the six membranes 303 arranged on the surface of the box body 301 can be extruded, the pile body 304 can be forced from any surface, and the diversity of data acquisition is improved;

the pressing block 219 is of a hemispherical structure, so that the pressing block 219 cannot damage the diaphragm 303 when the diaphragm 303 is pressed, meanwhile, the diaphragm 303 has certain ductility and sealing performance, and the pressing block 219 is controlled by the first telescopic mechanism 218, so that the pushing pressure of the pressing block 219 can be controlled;

meanwhile, the gearbox 212 is used for controlling the rotating speed of the annular slide block 208, so that the rapid adjustment is realized.

Example two

Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 10, fig. 11, fig. 12, and fig. 14, on the basis of the first embodiment, the present invention provides a technical solution:

a multidirectional pseudo-static test device for a building ground structure and pile foundation composite stress body is characterized in that a mounting frame 4 is mounted on the surface of a base 1, a top external force application simulation structure 5 is mounted at the top end of the mounting frame 4, and the top external force application simulation structure 5 is vertically mounted above a multidirectional pseudo-static test simulation mechanism 3;

the top external force application simulation structure 5 comprises a motor III 501, a bearing seat 504 and a telescopic mechanism II 514, the bearing seat 504 is installed on the surface of the mounting frame 4 above the multidirectional pseudo-static test simulation mechanism 3, a limiting rod 505 is inserted into the bearing seat 504, a limiting sleeve 506 is fixedly connected to the bottom end of the limiting rod 505, a limiting ball 507 is inserted into the limiting sleeve 506, a fixer 509 is fixedly connected to the bottom end of the limiting ball 507 through a connecting rod 508, and the fixer 509 is installed on the top end surface of the building structure 307;

the top end of the multidirectional pseudo-static test simulation mechanism 3 is fixedly limited through the top external force application simulation structure 5, so that the influence of the bottom external force application simulation structure 2 on the multidirectional pseudo-static test simulation mechanism 3 in the operation process is prevented, and the multidirectional pseudo-static test simulation mechanism 3 is prevented from falling down;

and stop collar 506 sets up to half spherical shell, and spacing ball 507 sets up to the spheroid, can the rotation or the swing of arbitrary direction in stop collar 506 through spacing ball 507 for multidirectional pseudo-static test simulation mechanism 3 is receiving outside application of force simulation structure 2 in the bottom when carrying out multidirectional pseudo-static test, building structure 307 can not take place to topple no matter to any direction skew, and insert through gag lever post 505 and establish in bearing frame 504, make building structure 307, base station 306, the integrative structure that pile body 304 constitutes can the upper and lower skew of small-range, the data inaccuracy of gathering when can not causing multidirectional pseudo-static test.

EXAMPLE III

Referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 10, fig. 11, fig. 12, and fig. 14, on the basis of the first embodiment and the second embodiment, the present invention provides a technical solution:

a third motor 501 is mounted at the top end of the mounting frame 4, a third control shaft 502 is rotatably connected to a rotating shaft of the third motor 501, the third control shaft 502 is inserted into the mounting frame 4 and rotatably connected with a second control gear 503 by penetrating through the mounting frame 4, a mounting seat 510 is fixedly connected to the bottom end surface of the mounting frame 4, which is positioned at the outer side of the bearing block 504, a sliding groove is formed inside the mounting seat 510, a convex block is arranged at the edge of the sliding groove, a driving gear 511 is inserted into the mounting seat 510, and the driving gear 511 is meshed with the second control gear 503 so that the third motor 501 can drive the third control shaft 502 to be connected with the second control gear 503 to be meshed with the driving gear 511 to rotate when in operation;

meanwhile, the surface of the driving gear 511 is fixedly connected with a second fixing rod 512, the bottom end of the second fixing rod 512 is fixedly connected with a second fixing plate 513, the surface of the second fixing plate 513 is provided with a second telescopic mechanism 514, and the second telescopic mechanism 514 is provided with a push block 515;

and the surface of the connecting rod 508 is provided with a fixing ring 517 through a supporting rod 516, and the fixing ring 517 and the push block 515 maintain the same horizontal height;

the driving gear 511 rotates to drive the second telescopic mechanism 514 to rotate, so that the push block 515 mounted on the second telescopic mechanism 514 can adjust any angle on the surface of the fixed ring 517, and the second telescopic mechanism 514 drives the push block 515 to slide, so that the push block 515 can push the fixed ring 517 to be connected with the limiting ball 507 to swing in the limiting sleeve 506, thereby realizing force application simulation on the upper part of the structure of the multi-directional pseudo-static test simulation mechanism 3 and data acquisition of a multi-directional pseudo-static test;

the acquired data and the data acquired by the bottom external force application simulation structure 2 when the force application simulation is carried out on the bottom of the structure of the multidirectional pseudo-static test simulation mechanism 3 have difference, so that the data acquisition of the multidirectional pseudo-static test has diversity, and the test accuracy is improved;

and the push block 515 is internally provided with a trapezoidal opening, so that the push block 515 can push the fixed ring 517 more stably and cannot fall off midway.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a building ground structure and compound atress body multidirectional pseudo-static test device of pile foundation, includes base (1), its characterized in that: the surface of the base (1) is fixedly connected with a bottom external force application simulation structure (2), and the surface of the bottom external force application simulation structure (2) is provided with a multidirectional pseudo-static test simulation mechanism (3);

the bottom external force application simulation structure (2) comprises a test bed (201), a first motor (202), a second motor (210) and a first telescopic mechanism (218), the test bed (201) is fixedly connected to the surface of the base (1), the top end surface of the test bed (201) is fixedly connected with the first motor (202), a rotating shaft of the first motor (202) is rotatably connected with a first control shaft (203), the first control shaft (203) is inserted into the test bed (201) and penetrates through the test bed (201) to be rotatably connected with a turntable (204), and the turntable (204) is installed on the surface of the test bed (201);

the multidirectional pseudo-static test simulation mechanism (3) comprises a box body (301), a pile body (304), a base platform (306) and a building structure body (307), wherein the box body (301) is installed on the surface of a rotary table (204), six groups of circumferentially distributed openings are formed in the surface of the box body (301), a diaphragm (303) is fixedly connected in each group of openings, soil is filled in the box body (301), the pile body (304) is inserted in the center of the soil, a pressure sensor (305) is fixedly connected to the surface of the pile body (304), the base platform (306) is fixedly connected to the top end of the pile body (304), and the building structure body (307) is fixedly connected to the top end of the base platform (306);

the surface of the test bed (201) is fixedly connected with an annular slide rail (207), an annular slide block (208) is inserted into the annular slide rail (207), the surface of the annular slide block (208) is provided with insections, the annular slide block (208) is meshed with and connected with a first control gear (214), the first control gear (214) is installed in a connecting shaft (213), and the connecting shaft (213) is in transmission connection with a second control shaft (211) installed on a rotating shaft of a second motor (210) through a gearbox (212);

the surface of the annular sliding block (208) is fixedly connected with a first fixing rod (216), the top end of the first fixing rod (216) is fixedly connected with a first fixing plate (217), the surface of the first fixing plate (217) is provided with a first telescopic mechanism (218), and a pressing block (219) is arranged on the first telescopic mechanism (218).

2. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the surface of test bench (201) is provided with two sets of concentric annular spouts, the bottom surface of carousel (204) is provided with two sets of concentric annular mounting grooves, the spout on test bench (201) surface and the mounting groove looks adaptation of carousel (204) bottom surface, it is equipped with ball (205) all to insert in the mounting groove that carousel (204) bottom surface set up.

3. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the bottom end surface of the box body (301) is provided with a convex block, threaded holes which are distributed circumferentially are formed in the convex block, and the box body (301) is fixed on the rotary table (204) through a second fixing bolt (302).

4. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the annular slide rail (207) is installed on the surface of the test bed (201) through a first fixing bolt (206), and a second ball (209) is installed in a mounting hole and a mounting hole which are circumferentially distributed on the surface of the bottom end of the annular slide block (208).

5. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the first telescopic mechanism (218) is a hydraulic cylinder or an electric telescopic rod, and one end of the mounting rod (215) is fixedly connected to the mounting frame (4).

6. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the pressing block (219) and the diaphragm (303) are at the same horizontal height, and the pressing block (219) is arranged to be hemispherical.

7. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the pile body (304), the base platform (306) and the building structure body (307) are of an integral structure, the pile body (304), the base platform (306) and the building structure body (307) are formed by pouring concrete or welding steel structures, and the pressure sensors (305) are arranged into three groups and are respectively fixed at the top end, the center and the bottom end of the pile body (304).

8. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 1, wherein: the surface of the base (1) is fixedly connected with an installation frame (4), and the surface of the installation frame (4) is provided with a top external force application simulation structure (5);

the external application of force analog structure in top (5) includes motor three (501), bearing frame (504) and telescopic machanism two (514), bearing frame (504) are installed in the top that mounting bracket (4) surface lies in multidirectional pseudo-static test analog mechanism (3), gag lever post (505) are inserted to the inside of bearing frame (504), the bottom fixedly connected with stop collar (506) of gag lever post (505), the inside of stop collar (506) is inserted and is equipped with spacing ball (507), the bottom fixed surface of spacing ball (507) is connected with connecting rod (508), the bottom fixed surface of connecting rod (508) is connected with fixer (509), fixer (509) are installed on building structure (307).

9. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 8, wherein: the limiting sleeve (506) is hemispherical, and the size of the limiting ball (507) is matched with that of the limiting sleeve (506).

10. The multi-directional pseudo-static test device for the building ground structure and pile foundation composite stress body according to claim 8, wherein: a third motor (501) is fixedly connected to one side, located on the bearing seat (504), of the surface of the mounting frame (4), a third control shaft (502) is rotatably connected to a rotating shaft of the third motor (501), and the third control shaft (502) is inserted into the mounting frame (4) and penetrates through the mounting frame (4) to be fixedly connected with a second control gear (503);

the bottom end surface of the mounting frame (4) is fixedly connected with a mounting seat (510) and is positioned on the outer side of the bearing seat (504), a driving gear (511) is inserted into the mounting seat (510), the bottom end surface of the driving gear (511) is fixedly connected with a second fixing rod (512), the bottom end surface of the second fixing rod (512) is fixedly connected with a second fixing plate (513), the surface of the second fixing plate (513) is fixedly connected with a second telescopic mechanism (514), and the second telescopic mechanism (514) is mounted on the push block (515);

the surface of the connecting rod (508) is provided with a fixing ring (517) through a supporting rod (516), and the fixing ring (517) and the push block (515) are at the same horizontal height;

and the second telescopic mechanism (514) is a hydraulic cylinder or an electric telescopic rod.