CN214584454U

CN214584454U - Counter force type laminated shearing model box

Info

Publication number: CN214584454U
Application number: CN202120226836.9U
Authority: CN
Inventors: 张磊; 赵浚程; 张震; 罗丹阳; 许徐晗
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2021-11-02
Anticipated expiration: 2031-01-27

Abstract

The utility model relates to a model case is cuted to reaction formula stromatolite mainly includes rings, rigid base, static platform, folds ring, pole setting, reciprocating actuator and counter-force wall etc.. The rigid base is characterized in that upright rods and hanging rings made of the same material are symmetrically arranged along the long edge direction of the rigid base, a 1 st layer to an nth layer of hard aluminum alloy shearing frames with the same thickness are sequentially arranged on the upper surface of the rigid base from bottom to top, and except the 1 st layer which is a fixed layer, the rest n-1 layers are movable layers capable of freely and transversely displacing. The left end part of the static force table is provided with a reaction wall, a series of reciprocating actuators with the same height as the center of each movable layer are respectively arranged on the reaction wall, and the other ends of the reciprocating actuators are hinged with the hard aluminum alloy shearing frames with the corresponding heights. A rubber film is arranged on the inner side of the shearing box to adapt to the inner size of the shearing box and prevent soil and water in the box from leaking during a test. The utility model discloses a displacement and the inertial force of ground under the effect of pseudo-static method simulation earthquake have advantages such as simulation effect is accurate, test operation is simple and convenient, experimental cost economy.

Description

Counter force type laminated shearing model box

Technical Field

The utility model relates to a civil engineering field, concretely relates to counter-force formula stromatolite shearing mold box.

Background

At present, because the geotechnical seismic engineering field lacks enough seismic field actual measurement data, reliable seismic response data are generally obtained by developing an indoor model test. The shaking table test is the most important type of indoor model test, but because the shaking table is very expensive in manufacturing cost and the test procedure is more complicated, the ever-increasing earthquake model test requirements are difficult to meet. Therefore, there is a need to develop a new indoor earthquake model testing device with simple operation and low cost.

SUMMERY OF THE UTILITY MODEL

In view of developing the economy of shaking table earthquake model test and consume and the technical cost is huge, the utility model aims to solve the technical problem that a fungible shaking table earthquake model test is provided, have a reaction formula stromatolite shearing model case of characteristics such as simple structure, installation of being convenient for, the biggest lateral displacement is controllable again simultaneously, under the pseudo-static force condition, simulate earthquake load effect through simple and easy equipment such as equipment static platform, reaction wall and reciprocating actuator, can realize developing low-cost indoor earthquake model test research under no shaking table equipment condition.

In order to solve the problem, the utility model provides a mould case is sheared to reaction formula stromatolite, including model case main part, its characterized in that: the method is characterized in that: the bottom of the model box main body is provided with a rigid base and a static platform;

the rigid base is fixed with the table top of the static table by a plurality of bolts; a plurality of upright posts and lifting rings made of the same material are arranged on the rigid base, and the lifting rings are connected with the end parts of the upright posts through threads; the upright posts are symmetrically arranged around two sides of the model box main body to form a hoisting system, so that the model box main body can be conveniently installed and moved;

the upper surface of the rigid base is formed by sequentially laminating 1 st to nth hard aluminum alloy shearing frames with the same thickness from bottom to top; except that the 1 st layer of shear frames are fixed on the rigid base, the rest n-1 layers of shear frames are all movable layers capable of generating transverse displacement; wherein n is greater than 3, and n is a natural number;

the two layers of shear frames adjacent to each other up and down comprise an upper frame and a lower frame; a plurality of independent rolling systems which are positioned on the same horizontal plane are arranged between the upper frame and the lower frame along the long edge of the shearing frame; the rolling system comprises a lower surface groove, an upper surface groove, a ball and a bearing;

the lower surface grooves and the upper surface grooves are respectively arranged along the lower surface and the upper surface in the long edge direction between the upper frame and the lower frame of the two adjacent layers of the shearing frames; the length difference of the grooves exists between the upper layer of shearing frame and the lower layer of shearing frame, and the groove on the lower surface of the upper frame is longer than the groove on the upper surface of the lower frame, so that the adjacent shearing frames can generate free transverse displacement under the premise of limited protection;

a reaction wall is arranged at the left end part of the static force table, and a plurality of reciprocating actuators which correspond to the 1 st to nth layers of shearing frame frames in the same height are sequentially arranged along the height direction; the end part of the reciprocating actuator is hinged with the shearing frame with the corresponding height through the connector, so that the shearing frame is prevented from laterally deviating under the action of the reciprocating actuator, and the shearing frame is enabled to reciprocate only in the horizontal length direction; the reciprocating actuator is controlled and output in a reciprocating mode according to force or displacement, so that free field deformation or foundation inertia force caused by earthquake load can be simulated, and the reciprocating actuator can be applied to earthquake model tests;

except the shearing frame at the top of the model box main body, the grooves on the upper surfaces of the other shearing frames along the long edge direction are all provided with bearings and a plurality of balls of a rolling system; the bearing device is arranged in the groove on the upper surface; the plurality of balls are fixed in the bearing so as to realize that the relative positions of the plurality of balls are not deviated; and the length of the bearing is smaller than that of the groove on the upper surface, so that rolling friction is ensured between the contact surfaces of the ball and the bearing.

Preferably, when n is 10, the upper surface of the rigid base is formed by sequentially overlapping 1 st to 10 th hard aluminum alloy shear frames with the same thickness from bottom to top; except that the 1 st layer of shear frames are fixed on the rigid base, the other 9 layers of shear frames are all movable layers capable of generating transverse displacement.

Furthermore, a rubber film is arranged on the inner side of the shearing box of the shearing frame surrounding structure so as to adapt to the inner size of the shearing box and prevent soil and water in the shearing box from leaking during a test.

Furthermore, the rubber film is an impermeable flexible rubber film; the size of the rubber membrane is completely attached to the size of the inner space of the shearing model box, and the periphery of the upper part of the rubber membrane is fixed on the top surface of the topmost shearing frame of the shearing model box.

The reaction type laminated shearing model box can replace a reaction type laminated shearing model box test device for a vibration table earthquake model test, a reaction wall is arranged at the left end part of a static table, reciprocating actuators corresponding to the height of each movable layer frame are respectively arranged on the reaction wall, and the end parts of the reciprocating actuators are connected with each movable layer hard aluminum alloy frame through connectors. Because the reciprocating actuator can control output in a reciprocating way according to force or displacement, the free field deformation of the foundation soil and the earthquake inertia force can be simulated in the earthquake process. A hoisting system and a guide system are arranged on a rigid base, and rectangular hard aluminum alloy shearing frames with the same thickness from the 1 st layer to the 10 th layer are sequentially overlapped on the upper surface of the rigid base from bottom to top to form a model box. A plurality of grooves are formed between the upper layer of frame and the lower layer of frame and are arranged along the long edge, the grooves in the upper surface of the lower frame are used for placing bearings, a plurality of rigid balls are contained between each bearing, the length of the grooves in the lower surface of the upper frame is slightly longer than that of the grooves in the upper surface of the lower frame, and the grooves are tangent to the upper portions of the balls. The rubber membrane with matched size is arranged on the inner side of the shearing box, and the upper part of the rubber membrane is fixed at the top of the model box. The utility model provides a hoist and mount system and guidance system comprises rigid base and the same material pole setting and rings that set up along its length direction symmetry, and rings pass through the end connection of screw thread and pole setting.

The working principle of the utility model is as follows:

the reaction type laminated shear model box simulates the earthquake load effect by assembling simple equipment such as a static platform, a reaction wall, a reciprocating actuator and the like under the pseudo-static condition, and can realize the development of low-cost indoor earthquake model test research under the condition of no vibration table equipment.

And a plurality of reciprocating actuators with the same height as the center of each movable layer hard aluminum alloy shearing frame are fixed on the counter-force wall, and the reciprocating actuators are hinged with the movable layer hard aluminum alloy shearing frames through connecting devices. The reciprocating actuator is output according to force or displacement reciprocating control, so that free field deformation or foundation inertia force caused by seismic load can be simulated, and the device can be better applied to seismic model tests. The actuator can be hinged with the shearing frame through the connector, so that the hard aluminum alloy shearing frame of the movable layer can move to and fro only in the horizontal length direction. The rigid base is provided with the hoisting system and the guide system, so that the counter-force type laminated shearing model box can be conveniently installed on a static table board, the whole laminated shearing box is limited and protected, and safety accidents such as sliding of the rectangular shearing frame and the like in an earthquake simulation test can be effectively avoided.

The rectangular hard aluminum alloy shear frames with the same thickness from the 1 st layer to the 10 th layer are overlapped from the upper surface of the rigid base from bottom to top in sequence. A plurality of grooves are respectively carved on the upper surface and the lower surface of each two adjacent layers of shearing frames along the long edge direction, and the grooves on the lower surface of the upper frame in the upper and lower adjacent frames are slightly larger than the length of the grooves on the upper surface of the lower frame, so that the length difference of the grooves is formed, and the maximum transverse displacement of each layer of shearing frame can be controlled. Except the topmost frame, linear bearings are arranged in grooves on the upper surface of the rest frames along the long edge direction. The linear bearing is placed in the groove, and the length of the bearing is slightly smaller than that of the groove, so that rolling friction is guaranteed between the ball and the contact surface. The balls are fixed in the linear bearing, so that the relative position between the balls is not deviated.

The utility model has the advantages and beneficial effects as follows:

the utility model discloses under the pseudo-static condition, develop indoor earthquake model test research through devices such as static platform, counterforce wall and reciprocating actuator, can simulate deformation and the inertia of foundation soil under the earthquake action respectively, have characteristics such as simulation effect accuracy, simple operation, test cost are lower, specifically as follows:

1. under the pseudo-static method, the simple devices such as a static table, a reaction wall and a repetitive actuator are used for replacing the function of the vibration table in the earthquake simulation test, so that the problems of high manufacturing cost, high test control requirement and the like of the vibration table are solved.

2. The reciprocating actuator can control output according to force or displacement, and the combination of the laminated shear box can simulate the nonlinear deformation of the foundation soil and the earthquake inertia force applied to the foundation soil in the earthquake process.

3. The static table is provided with a reaction wall which can stabilize the static table so as not to deviate in the vibration process, and a plurality of groups of repeated actuators which are in one-to-one correspondence with the shearing frames of the movable layer can be erected in the height direction of the reaction wall.

4. The shearing frame made of the hard aluminum alloy material can minimize the influence of the mass of the model box on a model test, and the hard aluminum alloy frame has higher rigidity, so that the box body can not generate internal force deformation except shearing deformation in the soil deformation process.

5. The lifting system and the guide system formed by the rigid base, the upright stanchion and the lifting ring not only facilitate the installation of the reaction type laminated shearing model box on a static platform, but also play a role in limiting and protecting the whole laminated shearing model box during controlled displacement, and can effectively avoid safety accidents such as the lateral sliding of a rectangular shearing frame and the like in an earthquake model test.

6. The lifting rings are in threaded connection with the vertical rods, and the heights of the lifting rings and the vertical rods can be adjusted, so that the number of stacked layers can be increased conveniently in the future due to the requirement of tests.

7. The length difference exists between the grooves on the upper surface and the lower surface of each two layers of rectangular shearing frames, and the maximum transverse displacement of the rectangular hard aluminum alloy shearing frames can be effectively controlled.

8. The groove, the ball and the bearing form a rolling element system which ensures that each layer of frame structure can generate horizontal free displacement; the length of the groove is slightly larger than that of the bearing, so that rolling friction between the ball and the contact surface can be realized all the time, and better test effect and durability of the model box are guaranteed.

9. The rolling systems are dispersedly arranged, each rolling system comprises a plurality of balls and bears upper pressure together, the upper pressure born by each ball is greatly reduced, the surfaces of the balls are polished and subjected to oil immersion lubrication, and the service lives of the balls are greatly prolonged.

10. Compared with the prior art, the utility model discloses the shape of the recess of opening is the rectangle to arc recess for other shearing the mould case uses, and recess length slightly is greater than bearing length, not only can ensure like this that a plurality of rolling element systems are in on the same horizontal plane, individual layer frame does not take place the slope around the vibration, the security of guarantee experimentation and the reliability of result.

11. The rubber membrane is arranged on the inner side of the shearing box, so that the leakage of soil and water in the model box can be prevented, and the deformation characteristic of the model box is not influenced.

Drawings

FIG. 1 is a perspective view of an embodiment of the present invention for a counter-force type stacked shear mold box;

FIG. 2 is a front view of an embodiment of the present invention for a counter-force type stacked shear mold box;

FIG. 3 is a side view of the present invention used in a reaction type stacked shear mold box;

FIG. 4 is a top view of the present invention used in a counter-force type stacked shear mold box;

FIG. 5 is an enlarged view of a portion A of FIG. 2;

fig. 6 is a side view of the portion B in fig. 5.

In the figure: 1. rigid base, 2, shearing frame, 3, vertical rod, 4, rings, 5, rolling system, 6, bolt, 7, upper surface groove, 8, bearing, 9, ball, 10, lower surface groove, 11, counter-force wall, 12, static platform, 13, repetitive actuator, 14 and connector.

Detailed Description

The present invention will be further described in detail with reference to the following drawings and specific embodiments.

As shown in fig. 1 to 6, the counter force type stacked shear model box has a rigid base 1 at the bottom, the rigid base 1 is fixed to a static table 12 by bolts 6, vertical rods 3 and lifting rings 4 made of the same material are symmetrically arranged on the model box along the long side direction, and the lifting rings 4 are connected with the end parts of the vertical rods 3 through threads. The upper surface of the rigid base 1 is formed by sequentially laminating 1 st layer to 10 th layer of hard aluminum alloy shearing frames 2 with the same thickness from bottom to top, and except that the 1 st layer is fixed on the rigid base 1, the rest 9 layers are movable layers capable of generating transverse displacement. The left end part of the static platform 12 is provided with a counterforce wall 11, the reciprocating actuators 13 corresponding to the frames of each movable layer are sequentially arranged along the height direction, the end parts of the reciprocating actuators 13 are connected with the hard aluminum alloy shearing frame 2 of the movable layer through connectors 14, and the hard aluminum alloy shearing frame 2 of the movable layer is prevented from lateral deviation under the action of the reciprocating actuators 13.

In this example, a plurality of independent rolling systems 5 on the same horizontal plane are arranged between two adjacent upper and lower frames along the long edge, and each rolling system 5 is formed by a groove 10 on the lower surface of the upper frame, a groove 7 on the upper surface of the lower frame, a bearing 8 and a ball 9.

In order to ensure that the adjacent cutting frames can freely and transversely displace under the premise of limited protection, the length difference exists between the grooves of the upper and lower adjacent cutting frames, namely the groove 10 on the lower surface of the upper frame is slightly longer than the groove 7 on the upper surface of the lower frame.

The utility model discloses concrete experimental step and the notice in the earthquake model test:

1. before the test, a rigid base 1, a fixed shearing frame and 2-10 layers of hard aluminum alloy shearing frames 2 of the movable layer are sequentially arranged.

2. A specially-made rubber film is arranged in the laminated shearing model box, and the size of the rubber film is ensured to be completely attached to the size of the internal space of the shearing model box and the periphery of the upper part of the rubber film is also completely fixed on the top surface of the uppermost shearing frame.

3. The test soil body is placed into a model box, and at the moment, the situation that soil and water do not overflow in the box is guaranteed.

4. A hoisting system consisting of a rigid base 1, a vertical rod 3 and a hoisting ring 4 is adopted to place the laminated shearing model box filled with soil on a static platform 12.

5. The rigid base 1 and the static table 12 are fixed by bolts 6, and any dislocation between the shearing frames of the layers is ensured.

6. The bottom of the connector 14 is secured to the removable hard aluminum alloy shear frame by a nut, which ensures that the connector 14 does not deflect.

7. The reciprocating actuators 13 corresponding to the movable layer frames 2 are sequentially installed along the height direction of the reaction wall 11, at the moment, each group of reciprocating actuators 13 and the corresponding movable layer frame 2 are ensured to be positioned on the same horizontal plane, and the connection between the reciprocating actuators 13 and the aluminum alloy frame is stable and smooth.

8. After checking and confirming that the installation quality and the related preparation work are ready, the reciprocating actuator 13 is started, the reaction type laminated shearing model box and soil and other structural units in the box are subjected to seismic deformation and bear equivalent seismic inertia force along with the actuator, and meanwhile, related test data are recorded to facilitate future analysis.

Claims

1. The utility model provides a model case is cuted to reaction formula stromatolite, includes model case main part, its characterized in that: the bottom of the model box main body is provided with a rigid base (1) and a static platform (12);

the rigid base (1) is fixed with the table top of the static table (12) by a plurality of bolts (6); a plurality of upright posts (3) and lifting rings (4) which are made of the same material are arranged on the rigid base (1), and the lifting rings (4) are connected with the end parts of the upright posts (3) through threads; the upright posts (3) are symmetrically arranged around two sides of the model box main body to form a hoisting system, so that the model box main body can be conveniently installed and moved;

the upper surface of the rigid base (1) is formed by sequentially overlapping 1 st to nth hard aluminum alloy shearing frames (2) with the same thickness from bottom to top; except that the 1 st layer of shear frame (2) is fixed on the rigid base (1), the rest n-1 layers of shear frames (2) are all movable layers capable of generating transverse displacement; wherein n is greater than 3, and n is a natural number;

the two layers of the shearing frames (2) which are adjacent up and down comprise an upper frame and a lower frame; a plurality of independent rolling systems (5) which are positioned on the same horizontal plane are arranged between the upper frame and the lower frame along the long edge of the shearing frame (2); the rolling system (5) comprises a lower surface groove (10), an upper surface groove (7), a ball (9) and a bearing (8);

the lower surface grooves (10) and the upper surface grooves (7) are respectively arranged along the lower surface and the upper surface in the long edge direction between the upper frame and the lower frame of the two layers of shearing frames (2) which are adjacent up and down; the length difference of the grooves exists between the two adjacent layers of the shearing frames (2), and the groove (10) on the lower surface of the upper frame is longer than the groove (7) on the upper surface of the lower frame, so that the adjacent shearing frames (2) can freely and transversely displace on the premise of limited protection;

a reaction wall (11) is arranged at the left end part of the static force table (12), and a plurality of reciprocating actuators (13) corresponding to the frame center heights of the 1 st layer to the nth layer of shearing frames (2) are sequentially arranged along the height direction; the end part of the reciprocating actuator (13) is hinged with the shearing frame (2) with the corresponding height through the connector (14) so as to ensure that the shearing frame (2) does not deviate laterally under the action of the reciprocating actuator (13), and therefore the shearing frame can only displace in a reciprocating manner in the horizontal length direction; the reciprocating actuator (13) is controlled and output in a reciprocating mode according to force or displacement, so that free field deformation or foundation inertia force caused by seismic load can be simulated, and the device can be applied to seismic model tests;

except the shearing frame (2) at the top of the model box main body, bearings (8) and a plurality of balls (9) of the rolling system (5) are arranged in grooves (7) on the upper surfaces of the other shearing frames (2) along the long edge direction; the bearing (8) is arranged in the groove (7) on the upper surface; a plurality of balls (9) are fixed in the bearing (8) so as to realize that the relative positions of the plurality of balls (9) are not deviated; and the length of the bearing (8) is smaller than that of the upper surface groove (7) so as to ensure that the contact surface between the ball (9) and the bearing (8) is rolling friction.

2. A counter-force stacked shear model box according to claim 1, wherein:

when n is 10, the upper surface of the rigid base (1) is formed by sequentially overlapping 1 st to 10 th hard aluminum alloy shearing frames (2) with the same thickness from bottom to top; except that the 1 st layer of shear frame is fixed on the rigid base (1), the other 9 layers of shear frames (2) are all movable layers capable of generating transverse displacement.

3. A counter-force stacked shear model box according to claim 1 or 2, wherein: a rubber film is arranged on the inner side of a shearing box of the shearing frame (2) enclosure to adapt to the internal size of the shearing box and prevent soil and water in the shearing box from leaking during a test.

4. A counter-force stacked shear model box according to claim 3, wherein: the rubber film is an anti-seepage flexible rubber film; the size of the rubber membrane is completely attached to the size of the inner space of the shearing model box, and the periphery of the upper part of the rubber membrane is fixed on the top surface of the topmost shearing frame (2) of the shearing model box.