CN218990115U

CN218990115U - Static load test device for foundation

Info

Publication number: CN218990115U
Application number: CN202223177670.XU
Authority: CN
Inventors: 梁彦峰; 王志远; 严志; 张伟明; 沈云飞
Original assignee: China Railway Ninth Bureau Group No5 Engineering Co ltd
Current assignee: China Railway Ninth Bureau Group No5 Engineering Co ltd
Priority date: 2022-11-28
Filing date: 2022-11-28
Publication date: 2023-05-09
Anticipated expiration: 2032-11-28

Abstract

The application provides a static load test device of foundation belongs to foundation detection technical field, and this static load test device of foundation includes load test subassembly and disturbance spacing subassembly. Hammering the top of a sampling probe rod, penetrating the sampler 18 or 24 inches downwards from the current hole bottom according to the requirement of the sampling length, recording the number of hammering required by the probe rod to penetrate 15cm, and recording the number of hammering of each 10cm in 30cm and the total number of hammering of 30 cm. The swing deviation can appear in the sample probe penetration foundation soil layer, sample probe upper end collision ring contact, thereby drive the compression of recoil spring, the sample probe beat is bigger, the spring force is bigger more, the beat many times can drive the ring contact and correct the beat of sample probe, the ring contact surrounds diameter from the top down and reduces in proper order, correct the beat of sample probe and go on gradually, the repeated beat correction of equipment and operating personnel has been reduced, automatic carry out penetration standard test to the ground, realize the experimental measurement and calculation of foundation static load.

Description

Static load test device for foundation

Technical Field

The application relates to the technical field of foundation detection, in particular to a foundation static load test device.

Background

The bearing potential exerted by the increase of load on the unit area of foundation soil is commonly used as a comprehensive term for evaluating the stability of the foundation. Under the action of load, the foundation is deformed. Along with the increase of the load, the foundation deformation is gradually increased, and the stress in the foundation soil at the initial stage is in an elastic balance state, so that the foundation has safe bearing capacity. When the load continues to increase, the foundation is in a plastic region with a larger range, the bearing capacity of the foundation is insufficient and the stability is lost, and the foundation reaches the ultimate bearing capacity. Different foundation soil adopts different foundation bearing capacity detection methods, and standard penetration test methods are adopted for common cohesive soil, silt soil and sand soil.

However, the problems of foundation disturbance exist in the clay soil, the silt soil and the sand soil, deflection is serious in the hammering and falling process of the probe rod, personnel equipment is required to correct deflection of the probe rod, and the dependence of standard penetration test on equipment and operators is large.

Disclosure of Invention

The present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the application provides a foundation static load test device, the standard penetration test force application load is completed through automatic traction lifting drop hammers, and upper end deflection in the hammering process of the probe rod is corrected.

The application is realized in such a way that:

the application provides a foundation static load test device includes load test subassembly and disturbance spacing subassembly.

The load test assembly comprises a test frame, a directional guide rod, a drop hammer seat and a sampling probe rod, wherein the directional guide rod is arranged in the test frame, the drop hammer seat is in sliding sleeve connection with the surface of the directional guide rod, the sampling probe rod penetrates through the bottom of the test frame, the drop hammer seat faces the sampling probe rod, the disturbance limiting assembly comprises a limiting seat, a limiting screw rod, a ring contact and a recoil spring, the limiting seat slides on the surface of the test frame, the limiting screw rod penetrates through the surface of the limiting seat in a transmission manner, the ring contact is in sliding sleeve connection with one end of the limiting screw rod, the ring contact faces the sampling probe rod, the recoil spring is in sleeve connection with the surface of the limiting screw rod, one end of the recoil spring is attached to the surface of the limiting seat, and the other end of the recoil spring is attached to the surface of the ring contact.

In one embodiment of the application, the limiting seat is provided with a locking bolt in a transmission manner, and one end of the locking bolt is attached to the surface of the test stand.

In an embodiment of the application, the hand wheel has been cup jointed to the spacing screw other end is fixed, spacing screw one end is provided with the draw-in table, be provided with the draw-in groove in the ring contact, the draw-in table joint in the draw-in groove.

In one embodiment of the application, the lower end of the test stand is provided with a mounting table, the upper end of the test stand is provided with a mounting seat, and the two ends of the directional guide rod are arranged between the mounting table and the mounting seat.

In one embodiment of the present application, a damping spring is disposed on the mounting table, and the damping spring is sleeved at the lower end of the directional guide rod.

In one embodiment of the present application, the lower end of the drop hammer is provided with a hammer table, which is oriented toward the top of the sampling probe.

In one embodiment of the application, the upper end of the test stand is provided with a hook, and the upper end of the test stand is rotatably provided with a change gear.

In an embodiment of the application, the drop hammer seat is provided with a lifting wheel in a rotating mode, the test stand is provided with a traction wheel in a rotating mode, and the surface of the hook, the surface of the change gear, the surface of the lifting wheel and the surface of the traction wheel are provided with traction ropes in a winding mode.

In one embodiment of the application, a traction motor is arranged on the test stand, and the output end of the traction motor is meshed with the traction wheel.

In one embodiment of the present application, the drop hammer seat is provided with an orientation guide sleeve, and the orientation guide sleeve is slidably sleeved on the surface of the orientation guide rod.

The beneficial effects of this application are: the foundation static load test device that this application obtained through above-mentioned design, to selecting the foundation test to bore holes when using, after drilling to predetermined degree of depth, remove the test stand bottom to the drilling periphery, insert in the drilling with the sampling probe lower extreme. According to the height of the sampling probe rod, the height of the limiting seat on the test frame is adjusted in a sliding mode, the limiting seat is screwed in through the locking bolt, the limiting screw adjusting ring contact is rotated to be close to the upper end surface of the sampling probe rod, the pull ring contact is adjusted in a sliding mode to be in the position of the limiting screw, the pull ring contact is loosened to be fixed through the clamping table and the clamping groove, the upper end of the sampling probe rod is surrounded by the ring contact in a parallel mode, and the surrounding diameter between the ring contacts is required to be sequentially reduced from top to bottom.

The hammer table freely falls at the height of 76cm at the top of the sampling probe rod, the top of one sampling probe rod is hammered, the falling hammer seat is climbed by traction of a traction motor, a sampler is penetrated into 18 or 24 inches downwards from the current hole bottom according to the requirement of the sampling length, the number of hammers required by the probe rod to penetrate 15cm is recorded, and then the number of hammers per 10cm and the total number of hammers of 30cm in 30cm are recorded.

The swing deviation can appear in the sample probe penetration foundation soil layer, sample probe upper end collision ring contact, thereby drive the compression of recoil spring, the sample probe beat is bigger, the spring force is bigger more, the beat many times can drive the ring contact and correct the beat of sample probe, the ring contact surrounds diameter from the top down and reduces in proper order, correct the beat of sample probe and go on gradually, the repeated beat correction of equipment and operating personnel has been reduced, automatic carry out penetration standard test to the ground, realize the experimental measurement and calculation of foundation static load.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a static load testing device for foundation according to an embodiment of the present application;

fig. 2 is a schematic perspective view of a load test assembly according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a partial perspective view of a load testing assembly according to an embodiment of the present disclosure;

fig. 4 is a schematic perspective view of a disturbance limiting component according to an embodiment of the present application.

In the figure: 100-load test assembly; 110-test rack; 111-mounting; 112-mounting base; 113-a damper spring; 114-hooking; 115-change gear; 116-traction wheels; 117-a traction rope; 118-traction motor; 120-directional guide bar; 130-a drop hammer seat; 131-a hammer stage; 132-lifting wheels; 133-directional guide sleeve; 140-sampling probe rod; 300-disturbance limiting assembly; 310-limiting seats; 311-locking bolts; 320-limit screws; 321-a hand wheel; 322-clamping table; 330-ring contacts; 331-a clamping groove; 340-recoil spring.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some of the embodiments of the present application, but not all of the embodiments. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application.

Examples

As shown in fig. 1 to 4, the static load test apparatus for a foundation according to an embodiment of the present application includes a load test assembly 100 and a disturbance limiting assembly 300, and the disturbance limiting assembly 300 is mounted on the load test assembly 100. The load test assembly 100 completes the force load of the standard penetration test by automatically dragging the lifting drop hammer, and the disturbance limiting assembly 300 corrects the upper end deflection in the hammering process of the probe rod.

As shown in fig. 2-4, the problems of foundation disturbance are all existed in the clay soil, the mucky soil and the sand soil, the deflection is serious in the hammering and falling process of the probe rod, personnel equipment is required to correct the deflection of the probe rod, and the dependence of the standard penetration test on the equipment and operators is large

The load test assembly 100 includes a test stand 110, an orientation guide 120, a drop hammer 130, and a sampling probe 140. The directional guide 120 is disposed in the test stand 110, and a mounting stand 111 is disposed at the lower end of the test stand 110, and the mounting stand 111 is bolted to the test stand 110. The upper end of the test stand 110 is provided with a mounting seat 112, and the mounting seat 112 is bolted with the test stand 110. The two ends of the directional guide 120 are disposed between the mounting table 111 and the mounting seat 112, and the directional guide 120 is respectively bolted to the mounting table 111 and the mounting seat 112. The drop hammer seat 130 is in sliding sleeve connection with the surface of the directional guide rod 120, the drop hammer seat 130 is provided with a directional guide sleeve 133, the directional guide sleeve 133 is in bolt connection with the drop hammer seat 130, the directional guide sleeve 133 is in sliding sleeve connection with the surface of the directional guide rod 120, and the drop precision of the drop hammer seat 130 is improved. The lower end of the drop hammer seat 130 is provided with a hammer table 131, and the hammer table 131 is bolted with the drop hammer seat 130. A buffer rubber pad is arranged on the specific hammer table 131, so that the vibration influence on the drop hammer seat 130 in the hammering process is reduced. The total weight of the drop hammer seat 130 and the hammer table 131 is 63.5kg.

The sampling probe 140 penetrates through the bottom of the test stand 110, and the lower end of the specific sampling probe 140 is provided with a penetration sampler, which is convenient for penetration and soil sampling of cohesive soil, silt soil and sand soil. The drop hammer 130 faces the sampling probe 140, and the hammer block 131 faces the top of the sampling probe 140. The mounting table 111 is provided with a damping spring 113, and the damping spring 113 is sleeved at the lower end of the directional guide rod 120 to safely limit the falling of the drop hammer seat 130. The upper end of the test stand 110 is provided with a hook 114, and the hook 114 is bolted with the test stand 110. The upper end of the test stand 110 is rotatably provided with a change gear 115, and the change gear 115 is in bearing connection with the test stand 110. Lifting wheels 132 are rotatably arranged on the drop hammer seat 130, and the lifting wheels 132 are connected with a bearing seat of the drop hammer seat 130. The test stand 110 is rotatably provided with a traction wheel 116, and the traction wheel 116 is connected with a bearing seat of the test stand 110. Traction ropes 117 are wound on the surfaces of the hooks 114, the change gears 115, the lifting gears 132 and the traction gears 116, traction motors 118 are arranged on the test stand 110, and the traction motors 118 are bolted with the test stand 110.

Wherein, the output end of the traction motor 118 is meshed with the traction wheel 116, and the traction motor 118 is in gear transmission with the traction wheel 116. The hammer table 131 is driven by the traction motor 118 to be lifted to a height of 76cm to freely fall, and a standard probe rod is hammered.

The disturbance limiting assembly 300 includes a limiting mount 310, a limiting screw 320, a loop contact 330, and a recoil spring 340. The limiting seat 310 slides on the surface of the test stand 110, a locking bolt 311 is arranged on the limiting seat 310 in a transmission mode, and the locking bolt 311 is in threaded connection with the limiting seat 310. One end of the locking bolt 311 is attached to the surface of the test stand 110, and the height of the limiting seat 310 on the test stand 110 is adjusted. The limiting screw 320 is driven to penetrate through the surface of the limiting seat 310, and the limiting screw 320 is in threaded connection with the limiting seat 310. The ring contact 330 is slidably sleeved at one end of the limiting screw 320, a clamping table 322 is arranged at one end of the limiting screw 320, and the clamping table 322 and the limiting screw 320 are formed by drawing. The ring contact 330 is provided with a clamping groove 331, and the clamping table 322 is clamped in the clamping groove 331, and specifically adjusts the position of the ring contact 330. The ring contact 330 faces the sampling probe 140 to correct for the probe's wobble during hammering. The recoil spring 340 is sleeved on the surface of the limiting screw 320, and one end of the recoil spring 340 is attached to the surface of the limiting seat 310. The other end of the recoil spring 340 is attached to the surface of the ring contact 330. The other end of the limit screw 320 is fixedly sleeved with a hand wheel 321, so that the hand-held adjustment is convenient.

Specifically, the working principle of the foundation static load test device is as follows: drilling the selected foundation test, moving the bottom of the test stand 110 to the periphery of the drill hole after drilling the drill hole to a predetermined depth, and inserting the lower end of the sampling probe 140 into the drill hole. According to the height of the sampling probe rod 140, the height of the limiting seat 310 on the test frame 110 is adjusted in a sliding manner, the limiting seat 310 is screwed in through the locking bolt 311, the limiting screw 320 is rotated to adjust the ring contact 330 to be close to the upper end surface of the sampling probe rod 140, the pull-back ring contact 330 is adjusted in a sliding manner to be in the position of the limiting screw 320, the ring contact 330 is loosened to be fixed through the clamping table 322 and the clamping groove 331, the ring contact 330 surrounds the upper end of the sampling probe rod 140 in parallel, and the diameter of the ring contact 330 is required to be sequentially reduced from top to bottom.

The hammer table 131 freely falls at the height of 76cm at the top of the sampling probe 140, the top of one sampling probe 140 is hammered, climbing of the falling hammer seat 130 is realized by traction of the traction motor 118, the sampler is penetrated into 18 or 24 inches downwards from the current hole bottom according to the requirement of sampling length, the required hammering number of 15cm of the penetration of the probe is recorded, and then the hammering number of 10cm in 30cm and the total hammering number of 30cm are recorded.

The swing deviation of the sampling probe rod 140 penetrating into the foundation soil layer can occur, the upper end of the sampling probe rod 140 collides with the ring contact 330, so that compression of the recoil spring 340 is driven, the larger the deflection of the sampling probe rod 140 is, the larger the spring force is, the ring contact 330 can be driven by repeated hammering to correct the deflection of the sampling probe rod 140, the diameter of the ring contact 330 is enclosed to be sequentially reduced from top to bottom, deflection correction of the sampling probe rod 140 is also gradually carried out, repeated deflection correction of equipment and operators is reduced, automatic standard penetration test is carried out on the foundation, and test measurement and calculation of static load of the foundation are realized.

It should be noted that, the specific model specification of the traction motor 118 needs to be determined by selecting a model according to the actual specification of the device, and the specific model selection calculation method adopts the prior art, so that detailed description is omitted.

The power supply of traction motor 118 and its principles are apparent to those skilled in the art and will not be described in detail herein.

The above is only an example of the present application, and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

Claims

1. The static load test device for the foundation is characterized by comprising

The load test assembly (100), the load test assembly (100) comprises a test frame (110), a directional guide rod (120), a drop hammer seat (130) and a sampling probe rod (140), wherein the directional guide rod (120) is arranged in the test frame (110), the drop hammer seat (130) is in sliding sleeve connection with the surface of the directional guide rod (120), the sampling probe rod (140) penetrates through the bottom of the test frame (110), and the drop hammer seat (130) faces the sampling probe rod (140);

disturbance spacing subassembly (300), disturbance spacing subassembly (300) include spacing seat (310), spacing screw rod (320), ring contact (330) and recoil spring (340), spacing seat (310) slide in test frame (110) surface, spacing screw rod (320) transmission run through in spacing seat (310) surface, ring contact (330) slide cup joint in spacing screw rod (320) one end, ring contact (330) orientation sampling probe rod (140), recoil spring (340) cup joint in spacing screw rod (320) surface, recoil spring (340) one end laminate in spacing seat (310) surface, recoil spring (340) other end laminate in ring contact (330) surface.

2. The static load test device for the foundation according to claim 1, wherein a locking bolt (311) is arranged on the limiting seat (310) in a transmission manner, and one end of the locking bolt (311) is attached to the surface of the test stand (110).

3. The static load test device for the foundation according to claim 1, wherein a hand wheel (321) is fixedly sleeved at the other end of the limit screw (320), a clamping table (322) is arranged at one end of the limit screw (320), a clamping groove (331) is formed in the ring contact (330), and the clamping table (322) is clamped in the clamping groove (331).

4. The foundation static load test device according to claim 1, wherein an installation table (111) is arranged at the lower end of the test stand (110), an installation seat (112) is arranged at the upper end of the test stand (110), and two ends of the directional guide rod (120) are arranged between the installation table (111) and the installation seat (112).

5. The static load test device for the foundation according to claim 4, wherein a damping spring (113) is arranged on the mounting table (111), and the damping spring (113) is sleeved at the lower end of the directional guide rod (120).

6. The static load test device for the foundation according to claim 1, wherein a hammer table (131) is arranged at the lower end of the drop hammer seat (130), and the hammer table (131) faces the top of the sampling probe rod (140).

7. The static load test device for the foundation according to claim 1, wherein a hook (114) is arranged at the upper end of the test stand (110), and a change gear (115) is rotatably arranged at the upper end of the test stand (110).

8. The static load test device for the foundation according to claim 7, wherein a lifting wheel (132) is rotatably arranged on the drop hammer seat (130), a traction wheel (116) is rotatably arranged on the test stand (110), and traction ropes (117) are wound on the surfaces of the hooks (114), the change gear (115), the lifting wheel (132) and the traction wheel (116).

9. The static load test device for foundations according to claim 8, wherein a traction motor (118) is arranged on the test stand (110), and an output end of the traction motor (118) is meshed with the traction wheel (116).

10. The static load test device for the foundation according to claim 1, wherein the drop hammer seat (130) is provided with an orientation guide sleeve (133), and the orientation guide sleeve (133) is in sliding sleeve connection with the surface of the orientation guide rod (120).