CN110455480B - Three-dimensional limiting connecting piece for three-dimensional laminated shearing model box - Google Patents
Three-dimensional limiting connecting piece for three-dimensional laminated shearing model box Download PDFInfo
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- CN110455480B CN110455480B CN201910817931.3A CN201910817931A CN110455480B CN 110455480 B CN110455480 B CN 110455480B CN 201910817931 A CN201910817931 A CN 201910817931A CN 110455480 B CN110455480 B CN 110455480B
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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Abstract
The invention relates to a three-dimensional limit connecting piece for a three-dimensional laminated shearing model box, which is used for connecting an upper layer frame web plate and a lower layer frame web plate which are adjacent, and comprises a moving component, a limit control piece and a fixing component for fixing the three-dimensional limit connecting piece on the upper layer frame web plate and the lower layer frame web plate of the model box, wherein the moving component comprises a universal ball and a bullseye joint, the bullseye joint penetrates through the upper layer frame web plate and is fixedly connected with the universal ball, a steel ball capable of freely rolling is arranged below the universal ball and is arranged on the lower layer frame web plate to be in point contact with the lower layer frame web plate, so that friction free movement in the horizontal direction can be realized; the limiting control piece comprises a parallel baffle plate with a hub, a lower seat and symmetrical limiting holes, the middle part of the parallel baffle plate with the hub is provided with a circular ring, and two symmetrical wings are arranged on two sides of the parallel baffle plate. The invention can more effectively simulate the soil body boundary condition.
Description
Technical Field
The invention relates to a three-dimensional laminated shear model box device which can be used for a vibrating table test.
Background
Currently, the shaking table test is gradually applied in the geotechnical engineering field. In studying the soil-structure dynamic interactions using the shaking table test, it is necessary to provide a conditioned container, i.e., a model box, for the soil. The model box has limited volume and can vibrate along with the vibration of the table top, so that the soil body in the model box cannot completely simulate the free foundation condition and cannot reasonably simulate the infinite boundary condition of the foundation soil, which causes great difficulty for the test. The design of the model box for the vibrating table test is also an important work in the test of the soil-structure dynamic interaction vibrating table, and the model box with reasonable design is a precondition for smoothly completing the vibrating table test.
The typical model boxes mainly comprise a rigid model soil box, a cylindrical flexible model soil box and a layered shearing model soil box. The rigid model soil box has high overall rigidity, small lateral deformation of the box wall and strong boundary reflection, and the friction effect is considered, so that the larger boundary effect is easy to generate; the cylindrical flexible model soil box has flexibility, but the rigidity is difficult to control, and the soil layer is easy to bend and deform; the layered shearing model soil box is an ideal model soil box at present, and is formed by assembling a plurality of independent layered frames, wherein the frames can slide relatively in the horizontal direction, so that the shearing deformation of soil layers can be realized, and the soil body boundary conditions can be better simulated.
The existing layered shearing model soil box is mostly applied to a vibrating table test with a one-dimensional or two-dimensional vibrating direction, and the soil-structure dynamic interaction research of a complex engineering structure needs to consider the effect of three-way earthquake input, namely the model soil box needs to realize the vibration in two mutually perpendicular horizontal directions and one vertical direction. Most of the existing layered shearing model soil boxes are rectangular, limit devices are required to be arranged to prevent the existing layered shearing model soil boxes from generating excessive displacement, the cost is high, the installation is complex, and the model test requirements are difficult to well meet. The prior layered shearing model soil box interlayer connection mostly adopts springs, screws, bearings, balls and the like, so that interlayer friction is large, only the model box frame can move in two mutually perpendicular horizontal directions or a single horizontal direction, the model box frame cannot move freely in three directions, the characteristic research of model soil is influenced, and interlayer relative displacement cannot be effectively limited.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a design of a three-dimensional limiting connecting piece for a three-dimensional laminated shearing model box, which enables a model box frame to freely move in two mutually vertical horizontal directions and one vertical direction, and more effectively simulates soil body boundary conditions. The technical scheme of the invention is as follows:
a three-dimensional spacing connector for a three-dimensional laminated shearing model box, which is formed by splicing H-shaped aluminum alloy layered frames, comprises a moving component, a spacing control component and a fixing component for fixing the three-dimensional spacing connector on an upper frame web plate and a lower frame web plate of the model box, and is characterized in that,
the movable component comprises a universal ball and a bullnose joint, the bullnose joint passes through the upper layer frame web plate and is fixedly connected with the universal ball, steel balls capable of freely rolling are arranged below the universal ball and are arranged on the lower layer frame web plate to be in point contact with the lower layer frame web plate, and friction-free movement in the horizontal direction can be realized;
the limiting control piece comprises a parallel baffle plate with a hub, a lower seat and symmetrical limiting holes, wherein a circular ring is arranged in the middle of the parallel baffle plate with the hub, symmetrical two wings are arranged on two sides of the parallel baffle plate, a bull's eye joint and a universal ball are connected and then are sleeved in the circular ring in the middle of the parallel baffle plate with the hub, the symmetrical limiting holes are arranged on two sides of the lower seat, the two wings with the parallel baffle plate with the hub are respectively inserted into the symmetrical limiting holes on two sides of the lower seat and used for limiting the movement direction of the universal ball, so that the universal ball can move in two horizontal directions and one vertical direction which are mutually perpendicular, the movement distance of the universal ball in the vertical direction is limited within a certain range, a circular hole is formed in the upper part of the lower seat, the movement member penetrates and moves, and the movement distance of the universal ball in the horizontal direction is limited by the cylindrical outer wall of the lower seat, and the universal ball moves in a certain range in each horizontal direction.
Preferably, the moving member further comprises a sleeve disposed outside the bullseye joint, and the sleeve and the bullseye joint are jointly connected with the universal ball to enhance vertical bearing capacity.
The invention has the following advantages:
(1) The device can realize the vibration of the model soil box in two mutually vertical horizontal directions and one vertical direction by using the interlayer three-dimensional limiting connecting piece, and meets the requirement of a vibration table model test;
(2) The three-dimensional limiting connecting piece is used for connecting the layered frames, and the design of the universal ball and the parallel baffle with the hub ensures that friction force is not generated between two mutually connected frame layers, so that the real foundation situation can be effectively simulated;
(3) The layered frame is made of H-shaped aluminum alloy, so that the requirement on rigidity can be effectively met, and the layered frame is light in weight; simple structure, convenient manufacture, reliable function, flexible use and effective test cost saving.
Drawings
FIG. 1 is a top view of a cylindrical three-dimensional stacked shear molding box apparatus employing the connector of the present invention.
FIG. 2 is a cross-sectional view of a cylindrical three-dimensional stacked shear mold box apparatus employing the connector of the present invention.
Fig. 3 is a top view of the three-dimensional spacing connector of the present invention.
Fig. 4 is a cross-sectional view of a three-dimensional spacing connector of the present invention.
Fig. 5 is a schematic view of a three-dimensional spacing connector moving member of the present invention.
Fig. 6 is a schematic view of a three-dimensional limit connector limit control of the present invention.
The reference numerals in the figures illustrate: 1, a bolt; 2, a gasket; 3 bullseye fitting; 4, a sleeve; 5, universal ball; 6 parallel baffle plates with hubs; 7, lower seat; 8, a steel bottom plate; 9H aluminum alloy layered frame; 10 three-dimensional limit connecting pieces; 11 guard rails; 12 symmetrical limiting holes; 13 upper frame webs; 14 lower frame web.
Description of the embodiments
The present invention will now be described with reference to the accompanying drawings and examples which will enable those skilled in the art to more fully understand the invention and are not intended to limit the invention in any way.
Referring to fig. 1, 2, 3, 4, 5 and 6, the present invention provides a cylindrical three-dimensional laminated shear model box device for a vibration table test and a three-dimensional limit connector thereof, and the specific test device comprises: a steel soleplate 8,H type aluminum alloy layered frame 9 is arranged on the upper part of the steel soleplate 8; the three-dimensional limiting connecting piece 10 is arranged between the H-shaped aluminum alloy layered frames 9; the guard rail 11 is arranged around the H-shaped aluminum alloy layered frame 9 and is fixed to the steel bottom plate 8. The steel base plate 8 needs to have a strong rigidity to meet the load-bearing capacity requirement. The H-shaped aluminum alloy layered frame 9 is a closed circular ring formed by welding H-shaped aluminum alloy, is arranged in parallel at equal intervals in the vertical direction, and is formed by 14 layers in total, and the layers are connected by using a three-dimensional limiting connecting piece 10. The three-dimensional limiting connecting pieces 10 are fixed on the web plate of the H-shaped aluminum alloy layered frame 9 through bolts, 6 three-dimensional limiting connecting pieces 10 are arranged on each layer at equal intervals, a single three-dimensional limiting connecting piece 10 has certain strength to meet the bearing capacity requirement, the three-dimensional limiting connecting pieces 10 enable relative sliding between layers to be free of friction, the vertical displacement requirement can be met, and the horizontal displacement and the vertical displacement are limited within +/-5 mm. The guardrail 11 is formed by welding rectangular section steel pipes, and is provided with 8, and the guardrail is equidistantly encircled on the steel bottom plate 8 and is fixed on the H-shaped aluminum alloy layered frame 9 for a circle, so that the model soil box is prevented from excessively horizontally displacing in the vibration process.
The three-dimensional limiting connector 10 for the cylindrical three-dimensional laminated shearing model box specifically comprises: the connecting piece is fixed on an upper layer frame web 13 (a web of an upper layer H-shaped aluminum alloy layered frame) by 3 bolts 1 and 2 gaskets 2 together, and meanwhile, a sleeve 4 is fixed on the periphery of the bullseye joint 3; the upper end of the universal ball 5 passes through a middle circular ring of the parallel baffle 6 with the hub and a round hole at the upper part of the lower seat 7 to be sleeved in the bull's eye joint 3; two symmetrical wings on two sides of the parallel baffle plate 6 with the hub are respectively inserted into symmetrical limiting holes 12 on two sides of the lower seat 7, and the lower seat 7 is fixed on a web 14 of the lower frame (a web of the lower H-shaped aluminum alloy layered frame). The bull's eye joint 3, the steel sleeve 4 and the universal ball 5 need to have stronger strength to meet the bearing capacity requirement.
The steel balls below the universal ball 5 can realize friction-free movement in the horizontal direction. The parallel baffle 6 with the hub limits the moving direction of the universal ball 5 through the insertion connection of the two wings and the symmetrical limiting holes 12 on the two sides of the lower seat 7, so that the universal ball can move in two horizontal directions and one vertical direction which are perpendicular to each other, and simultaneously limits the moving distance of the universal ball 5 in the vertical direction, so that the universal ball can only move in the range of 5 mm upwards in the vertical direction. The cylindrical outer wall of the lower seat 7 limits the moving distance of the universal ball 5 in the horizontal direction so that the moving distance thereof is kept within + -5 mm. The vertical pressure is borne by the bull's eye joint 3, the steel sleeve 4 and the universal ball 5, so that no pressure is generated between the parallel baffle 6 with the hub and the lower seat 7, and no friction force is generated.
The cylindrical three-dimensional laminated shear model box device for the vibration table test comprises the following using steps:
(1) A steel bottom plate 8 and a sheet of H-shaped aluminum alloy layered frame 9 are connected by bolts;
(2) The H-shaped aluminum alloy layered frames 9 are overlapped from bottom to top, 6 equidistant three-dimensional limiting connecting pieces 10 are used for connecting the layers, and in the connecting process, the H-shaped aluminum alloy layered frames 9 are ensured to be horizontal and are arranged at equal intervals in the vertical direction;
(3) A steel base plate 8 and equidistantly arranged guard rails 11 are bolted.
The three-dimensional connecting piece comprises the following using steps:
(1) 2 bolts 1 and 1 washer 2 are used for fixing a steel sleeve 4 on the periphery of a bullseye joint 3;
(2) Two wings with a hub parallel baffle 6 are penetrated into symmetrical limiting holes 12 on two sides of the lower seat 7, and the centers of the two components are positioned on the same vertical line;
(3) The upper end of the universal ball 5 passes through a middle circular ring of the parallel baffle 6 with a hub and a round hole at the upper part of the lower seat 7, and is inserted into a mortise-tenon joint structure at the lower end of the bull's eye joint 3;
(4) The connecting piece is integrally fixed on an upper layer frame web 13 (a web of an upper layer H-shaped aluminum alloy layered frame) by using 1 bolt 1 and 1 gasket 2;
(5) The lower seat 7 is fixed on a web plate 14 of a lower layer frame (a web plate of a lower layer H-shaped aluminum alloy layered frame), and steel balls below the universal balls 5 can slide horizontally on the web plate.
The invention is not limited to the embodiments described above. The above description of specific embodiments is intended to describe and illustrate the technical aspects of the present invention, and is intended to be illustrative only and not limiting. Numerous specific modifications can be made by those skilled in the art without departing from the spirit of the invention and scope of the claims, which are within the scope of the invention.
Claims (2)
1. A three-dimensional spacing connector for a three-dimensional laminated shearing model box, which is formed by splicing H-shaped aluminum alloy layered frames, comprises a moving component, a spacing control component and a fixing component for fixing the three-dimensional spacing connector on an upper frame web plate and a lower frame web plate of the model box, and is characterized in that,
the movable component comprises a universal ball and a bullnose joint, the bullnose joint passes through the upper layer frame web plate and is fixedly connected with the universal ball, steel balls capable of freely rolling are arranged below the universal ball and are arranged on the lower layer frame web plate to be in point contact with the lower layer frame web plate, and friction-free movement in the horizontal direction can be realized;
the limiting control piece comprises a parallel baffle plate with a hub, a lower seat and symmetrical limiting holes, wherein a circular ring is arranged in the middle of the parallel baffle plate with the hub, symmetrical two wings are arranged on two sides of the parallel baffle plate, a bull's eye joint and a universal ball are connected and then are sleeved in the circular ring in the middle of the parallel baffle plate with the hub, the symmetrical limiting holes are arranged on two sides of the lower seat, the two wings with the parallel baffle plate with the hub are respectively inserted into the symmetrical limiting holes on two sides of the lower seat and used for limiting the movement direction of the universal ball, so that the universal ball can move in two horizontal directions and one vertical direction which are mutually perpendicular, the movement distance of the universal ball in the vertical direction is limited within a certain range, a circular hole is formed in the upper part of the lower seat, the movement member penetrates and moves, and the movement distance of the universal ball in the horizontal direction is limited by the cylindrical outer wall of the lower seat, and the universal ball moves in a certain range in each horizontal direction.
2. The three-dimensional limiting connection of claim 1, wherein the moving member further comprises a sleeve disposed outside the bullseye fitting, the sleeve and the bullseye fitting cooperatively engaging a universal ball to enhance vertical load bearing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910817931.3A CN110455480B (en) | 2019-08-30 | 2019-08-30 | Three-dimensional limiting connecting piece for three-dimensional laminated shearing model box |
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| CN201910817931.3A CN110455480B (en) | 2019-08-30 | 2019-08-30 | Three-dimensional limiting connecting piece for three-dimensional laminated shearing model box |
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| CN207248472U (en) * | 2017-05-03 | 2018-04-17 | 中国石油天然气集团公司 | A kind of 3-D stacks shear case |
| CN110455481B (en) * | 2019-08-30 | 2024-02-23 | 天津大学 | Three-dimensional laminated shearing model box |
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Patent Citations (3)
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| CN102494957A (en) * | 2011-11-22 | 2012-06-13 | 浙江大学 | Layered shear model box for centrifuge shaking table test |
| CN205538445U (en) * | 2016-04-08 | 2016-08-31 | 中铁西北科学研究院有限公司 | Mold box is cuted to vertical loading multilayer |
| CN109211501A (en) * | 2018-07-17 | 2019-01-15 | 同济大学 | A kind of two-way changeable large-scale stacked in layers formula shear model box |
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