CN218629279U

CN218629279U - Experimental apparatus is born to destructiveness of foundation pile tip rock stratum based on cavity is put down in simulation

Info

Publication number: CN218629279U
Application number: CN202222935345.9U
Authority: CN
Inventors: 李金朝; 雷勇; 李鹏甲; 曹振
Original assignee: Hunan University of Science and Technology
Current assignee: Hunan University of Science and Technology
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-03-14
Anticipated expiration: 2032-11-04

Abstract

The utility model discloses a based on simulation is laid empty foundation pile end rock stratum's destructiveness and is born experimental apparatus sets up on indoor experiment platform, including being used for making simulation and laying empty box structure, being used for portable upset loading mechanism of upset box structure, setting up in the measuring mechanism of box structure both sides, portable upset loading mechanism is including removing the support, setting up promotion tilting mechanism on removing the support and setting up the loading mechanism on removing the support, promote that tilting mechanism is detachable to be connected on the lug in the outside of outer protection steel drum, measuring mechanism includes adjustable measuring frame and sets up the percentage table on adjustable measuring frame, and indoor experimental apparatus can simulate the experiment of the bearing capacity of underlying empty pile foundation pile end rock stratum, can reach the experimental data and provide guide design for the construction, practices thrift economic cost for the construction progress.

Description

Experimental apparatus is born to destructiveness of foundation pile tip rock stratum based on cavity is put down in simulation

Technical Field

The utility model relates to a pile foundation stress test technical field, concretely relates to based on simulation prostrate empty foundation pile holds destructive of rock stratum and bears experimental apparatus.

Background

A large number of karst landforms are distributed in southwest areas of China, karst caves are avoided as far as possible when sites are selected on the basis, but in actual engineering, because the initial exploration is rough, the situation that the karst caves exist below a route is found in many times when the compensation is carried out in the engineering construction process, at the moment, a pile foundation faces the situation that the pile foundation needs to be placed on a karst cave foundation, the existing treatment method is to use mortar or special filler for filling, support means and other means are built in the interior to offset or weaken the influence of the lower caves on the foundation, but the measures not only increase the construction difficulty, but also greatly improve the treatment cost. According to the existing research results at present, under the condition that a karst top plate has a certain thickness, the bearing capacity of the karst top plate can be completely utilized, the pile end of a rock-embedded pile is arranged on the top plate of a lower floating cavity foundation with a certain thickness, so that the bearing capacity of a lower structure foundation meets the requirement of an upper structure vertical load and the stability of the lower karst cavity top plate is kept.

Therefore, developing an indoor model test for simulating the bearing destructiveness of the pile foundation pile end rock stratum under the underlying cavity condition is very important for guiding the engineering construction of the karst area, ensuring the safety of the structure, saving the economic cost and accelerating the construction progress, and has great engineering significance and economic value.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to overcome the defects of the prior art, the destructive bearing experiment device based on the foundation pile end rock stratum of the simulated cavity is provided, an experiment for simulating the bearing capacity of the foundation pile end rock stratum of the underlying cavity pile can be carried out through an indoor experiment device, experiment data can be obtained to provide guidance design for construction, the economic cost is saved, and the construction progress is accelerated.

(II) technical scheme

The utility model discloses a following technical scheme realizes: the utility model provides a based on simulation is laid down cavity's foundation pile end rock stratum destructive and is born experimental apparatus sets up on indoor experiment platform, including being used for making the simulation to lay down cavity's box structure, being used for the portable upset loading mechanism of upset box structure, set up in the measuring mechanism of box structure both sides, the box structure includes interior protection steel drum, outer protection steel drum and the bottom plate that sets up with the axle center with interior protection steel drum, be provided with between interior protection steel drum and the outer protection steel drum and be used for the shaping simulation to lay down cavity clearance, the bottom plate can be dismantled and connect on outer protection steel drum, the outside of outer protection steel drum is provided with the lug, portable upset loading mechanism includes the movable support, sets up promotion tilting mechanism on the movable support and sets up the loading mechanism on the movable support, promote the detachable lug of connecting in the outside of outer protection steel drum of tilting mechanism, loading mechanism is perpendicular to box structure directly over, measuring mechanism includes adjustable measuring frame and sets up the percentage table on adjustable measuring frame.

Further, interior protection steel drum and outer protection steel drum are the uncovered cylinder, the welding has the horizontal pole buckle of cross configuration on the protection steel drum, the horizontal pole buckle can block on outer protection steel drum.

Furthermore, a plurality of bolt holes are formed in the bottom plate, and lifting bolts are connected to the bolt holes in a threaded mode.

Furthermore, the movable support comprises two slide rails which are arranged on the experiment platform in parallel, two upright posts which move along the slide rails are arranged on the slide rails, a counter-force beam is transversely arranged between the two upright posts, and the lifting turnover mechanism and the loading mechanism are fixed below the counter-force beam.

Furthermore, promote tilting mechanism and include two electric block that set up on the counter-force roof beam, loading mechanism is including jack and the simulation stake that is fixed in on the counter-force roof beam, be provided with the backing plate between jack and the simulation stake, be provided with pressure sensor between jack and the backing plate.

Further, adjustable measuring rack includes two pole settings and violently locates the horizontal pole between two pole settings, the horizontal pole is connected with two pole settings are detachable, be provided with the mounting bracket that is used for installing the percentage table on the horizontal pole.

(III) advantageous effects

Compared with the prior art, the utility model, following beneficial effect has:

the utility model provides a based on simulation hole foundation pile holds destructive load-bearing test device of rock stratum utilizes portable upset loading mechanism, conveniently adjusts the position of exerting pressure and the height of exerting pressure of jack, has improved the adaptability of device to and conveniently adjust the position of electric block, satisfy the requirement that promotes and remove the experimental part simultaneously; by utilizing a box body mechanism of the forming die, the integral casting method of the simulated cavity can be realized, so that the integrity and continuity of the simulated cavity are ensured; and experimental data can be obtained more intuitively through numerical values by utilizing the pressure sensor and the dial indicator.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is the installation schematic diagram of the box structure of the present invention.

Fig. 3 is a schematic view of the installation of the base plate and the box structure.

FIG. 4 is a schematic diagram of a structure before inversion of a simulated photovoltaic void.

Fig. 5 is an enlarged view of the loading mechanism in fig. 1.

1-simulating a volt hole; 2-a box structure; 3-a movable overturning loading mechanism; 4-a measuring mechanism; 21-inner protecting steel barrel; 22-outer protecting steel barrel; 23-a base plate; 31-moving the support; 32-lifting and overturning mechanism; 33-a loading mechanism; 41-adjustable measuring stand; 42-dial indicator; 211-cross bar snap; 221-lifting lugs; 222-a drum bolt block; 231-floor bolting blocks; 232-hoisting bolt; 311-a slide rail; 312-column; 313-reaction beam; 321-an electric hoist; 331-jacks; 332-simulation piles; 333-backing plate; 334-a pressure sensor; 411-upright stanchion; 412-cross bar.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The destructive bearing experimental device based on the foundation pile end rock stratum simulating the photovoltaic cavity, as shown in fig. 1-5, is arranged on an indoor experimental platform, and comprises a box body structure 2 for manufacturing the simulated photovoltaic cavity 1, a movable overturning loading mechanism 3 for overturning the box body structure 2, and measuring mechanisms 4 arranged on two sides of the box body structure 2, wherein the box body structure 2 comprises an inner protective steel barrel 21, an outer protective steel barrel 22 coaxially arranged with the inner protective steel barrel 21, and a bottom plate 23, a cavity gap for molding the simulated photovoltaic cavity 1 is arranged between the inner protective steel barrel 21 and the outer protective steel barrel 22, the bottom plate 23 is detachably connected to the outer protective steel barrel 22, a lifting lug 221 is arranged on the outer side of the outer protective steel barrel 22, the movable overturning loading mechanism 3 comprises a movable support 31, a lifting overturning mechanism 32 arranged on the movable support 31, and a loading mechanism 33 arranged on the movable support 31, the lifting overturning mechanism 32 is detachably connected to the lifting lug 221 on the outer side of the outer protective steel barrel 22, the loading mechanism 33 is perpendicular to the box body structure 2, and the measuring mechanism 4 comprises a measuring frame 41 and an adjustable dial gauge 42 arranged on the measuring frame 41.

The inner protection steel barrel 21 and the outer protection steel barrel 22 are uncovered cylinders, a cross-shaped cross rod buckle 211 is welded on the inner protection steel barrel 21, the cross rod buckle 211 can be clamped on the outer protection steel barrel 22, a base plate bolting block 231 is arranged on the base plate 23, a steel barrel bolting block 222 matched with the base plate bolting block 231 is arranged at the edge of an opening of the outer protection steel barrel 22, a plurality of bolt holes are formed in the base plate 23, a hoisting bolt 232 is connected to the bolt holes in a threaded manner, the movable support 31 comprises two sliding rails 311 arranged on an experimental platform in parallel, two upright posts 312 moving along the sliding rails 311 are arranged on the sliding rails 311, a counter-force beam 313 is transversely arranged between the upright posts 312, the lifting turnover mechanism 32 and the loading mechanism 33 are fixed below the counter-force beam 313, the lifting turnover mechanism 32 comprises two electric hoists 321 arranged on the counter-force beam 313, the loading mechanism 33 comprises a jack 331 and a simulation post 332 fixed on the two beams 313, a pressure sensor 331 and a detachable upright post 333 are arranged between the jack 331 and the upright post 411, and a cross rod 412 for measuring the two cross rods 411 are connected, and a dial indicator 411 is arranged between the two detachable post 412.

Specifically, the lower end of the upright column 312 is provided with a movable seat, the lower end of the movable seat is slidably connected with the slide rail 311, by sliding the movable base on the slide rails 311, the column 312 is moved on the laboratory bench, the reaction beam 313 is connected with two parallel upright columns 312 through bolts, one side of the upright column 312 connected with the reaction beam 313 is provided with a plurality of adjusting holes, the height of the reaction beam 313 from the experiment table can be adjusted through the adjusting holes, thereby being applicable to different experimental scenes, the reaction beam 313 and the upright column 312 can also adopt a slide rail connection mode to facilitate the reaction beam 313 to move up and down, the jack 331 and the electric block 321 are both arranged right below the reaction beam 313, the jack 331 is used for applying pressure to the experimental object, the two electric hoists 321 are used for hoisting and overturning the manufactured and molded simulated volley hole 1, meanwhile, other experimental parts can be lifted, the lifting and transferring effects can be realized by matching with the movable bracket 31, the electric hoist 321 is a lifting device, the vertical rod 411 is also provided with an adjusting mounting hole for adjusting the height of the cross rod 412 from the experiment table, so that the position of the dial indicators 42 can be adjusted more experimentally, the measuring ends of the two dial indicators 42 are perpendicular to and contact with the upper surface of the base plate 333, the dial indicators 42 are adsorbed on the mounting rack and connected with the cross bar 412, the distance between the dial indicator 42 and the measured object can be adjusted by adjusting the cross bar 412, the mounting frames are a plurality of connecting rods hinged with each other, the dial indicator 42 can be finely adjusted by rotating the connecting rod, and the dial indicator 42 is used for measuring the flatness of the base plate 333 after pressure is applied to obtain experimental data.

The utility model provides a based on the simulation is prostrate the destructive of empty foundation pile end rock stratum and is born experimental apparatus, it is when concrete experiment, the operating procedure as follows:

1. injecting mortar with the required dosage for manufacturing the simulated photovoltaic cavity model into the outer protecting steel barrel 22, placing the inner protecting steel barrel 21 on the mortar in the barrel, and superposing the top edge of the inner protecting steel barrel 21 and the top edge of the outer protecting steel barrel 22 by applying an upper pressure method, namely, tightly adhering the cross bar buckle 221 to the top edge of the outer protecting steel barrel 22, thereby forming the inverted simulated photovoltaic cavity 1 model.

2. After the simulated photovoltaic cavity 1 is hardened for one day, the inner protection steel barrel 21 is lifted out through the electric hoist 321, after the simulated photovoltaic cavity 1 is completely hardened, a lifting bolt 232 is installed in a bolt hole in the bottom plate 23, then the bottom plate 23 is lifted to the upper side of the simulated photovoltaic cavity 1 through the movable support 31 through the electric hoist 321, a steel barrel bolting block 222 on the outer protection steel barrel 22 is connected with a bottom plate bolting block 231 on the bottom plate 23 through a bolt, the lifting lug 221 is connected through the electric hoist 321 through a lifting hook and turned over for 180 degrees, after turning over, the bolt connection between the steel barrel bolting block 222 and the bottom plate bolting block 231 is released, the lifting hook of the electric hoist 321 is connected with the lifting lug 221, and therefore the outer protection steel barrel 22 is lifted to take off the simulated photovoltaic cavity 1.

3. The simulation piles 332 are arranged above the simulation cavity 1 according to a certain arrangement mode, the base plate 333 is arranged above the simulation piles 332, the jack 331 is moved to the position above the base plate 333 through the movable support 31, the pressure sensor 334 is arranged between the base plate 333 and the jack 331, the head of the dial indicator 42 is arranged on the upper surface of the base plate 333, and the simulation piles 332 and the base plate 333 are both of a concrete molding structure.

4. The jack 331 is moved to the position above the base plate 333 through the movable support 31, the jack 331 is started to apply pressure to the simulation pile 332 through the base plate 333, the pressure change is observed by observing the reading of the pressure sensor 334 while applying pressure, the data of the bearing capacity simulation experiment are obtained from the reading change of the dial indicator 42, technical guidance is further provided for construction, and the safety of a construction structure is guaranteed.

The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by the technical solution of the present invention by those skilled in the art should fall into the protection scope of the present invention, and the technical contents claimed by the present invention have been fully recorded in the claims.

Claims

1. The destructive bearing experiment device based on the foundation pile end rock stratum of the simulated volt cavity is arranged on an indoor experiment platform and is characterized in that: including box structure (2) that are used for making simulation volt hole (1), portable upset loading mechanism (3) that are used for upset box structure (2), set up in measuring mechanism (4) of box structure (2) both sides, box structure (2) are including interior protection steel drum (21), outer protection steel drum (22) and bottom plate (23) that set up with the axle center with interior protection steel drum (21), be provided with the cavity clearance that is used for shaping simulation volt hole (1) between interior protection steel drum (21) and outer protection steel drum (22), bottom plate (23) can be dismantled and connect on outer protection steel drum (22), the outside of outer protection steel drum (22) is provided with lug (221), portable upset loading mechanism (3) are including moving support (31), set up promotion tilting mechanism (32) on moving support (31) and set up loading mechanism (33) on moving support (31), promotion tilting mechanism (32) detachable connect on lug (221) in the outside of outer protection steel drum (22), loading mechanism (33) perpendicular to box structure (2) top, but set up in adjustable dial indicator (41) and measuring mechanism (41).

2. The experimental device for destructive bearing of foundation pile end rock stratum based on simulation volt hole of claim 1 is characterized in that: interior protection steel drum (21) and outer protection steel drum (22) are the uncovered cylinder, the welding has cross configuration's horizontal pole buckle (211) on interior protection steel drum (21), horizontal pole buckle (211) can block on outer protection steel drum (22).

3. The experimental device for destructive bearing of foundation pile end rock stratum based on simulation volt hole of claim 1 is characterized in that: the bottom plate (23) is provided with a bottom plate bolting block (231), and the edge of the upper opening of the outer protecting steel barrel (22) is provided with a steel barrel bolting block (222) matched with the bottom plate bolting block (231).

4. The experimental device for destructive bearing of foundation pile end rock stratum based on simulation volt hole of claim 3, characterized in that: a plurality of bolt holes are formed in the bottom plate (23), and lifting bolts (232) are connected to the bolt holes in a threaded mode.

5. The experimental device for destructive bearing of foundation pile end rock stratum based on simulation volt hole of claim 1 is characterized in that: the movable support (31) comprises two slide rails (311) which are arranged on the experiment platform in parallel, two upright posts (312) which move along the slide rails (311) are arranged on the slide rails (311), a reaction beam (313) is transversely arranged between the two upright posts (312), and the lifting turnover mechanism (32) and the loading mechanism (33) are fixed below the reaction beam (313).

6. The experimental device for destructive bearing of foundation pile end rock stratum based on simulation volt hole of claim 5, is characterized in that: promote tilting mechanism (32) and include that two set up electric block (321) on reaction beam (313), loading mechanism (33) are including being fixed in jack (331) and simulation stake (332) on reaction beam (313), be provided with backing plate (333) between jack (331) and simulation stake (332), be provided with pressure sensor (334) between jack (331) and backing plate (333).

7. The experimental device for destructive bearing of foundation pile end rock stratum based on simulation volt hole of claim 1 is characterized in that: adjustable measuring stand (41) include two pole settings (411) and violently locate horizontal pole (412) between two pole settings (411), horizontal pole (412) are connected with two pole settings (411) are detachable, be provided with the mounting bracket that is used for installing percentage table (42) on horizontal pole (412).