A protection bracket suitable for shaking table tests and an installation method thereof

Abstract

The present invention relates to a protection bracket applicable to a shaking table test, which is used to protect a shaking table (5) placed in a trough. The protection bracket includes two longitudinal beams (1), two cross beams and at least two cantilever arms (4). The cross beams include two main cross beams (2) and two auxiliary cross beams (3). The two longitudinal beams (1) are symmetrically placed on the ground on both sides of the trough along the direction across the trough and are located on both sides of the shaking table (5). The two main cross beams (2) are arranged along the direction along the trough on both sides of the shaking table (5), and both ends of each main cross beam (2) are fixedly connected to the two longitudinal beams (1). The two auxiliary cross beams (3) are respectively fixedly connected side by side to the side of the two main cross beams (2) facing the trough. The two cantilever arms (4) are respectively fixedly connected side by side to the side of the two longitudinal beams (1) facing the shaking table (5). A cover plate is arranged on the protection bracket. Compared with the prior art, the present invention has the advantages of high safety and good flexibility.

Description

Technical Field

[0001] The present invention relates to the field of civil engineering, and particularly to a protection bracket applicable to a shaking table test and an installation method thereof. Background Art

[0002] A shaking table test can input ground motion to a test component through the shaking table surface to obtain the dynamic response of the component under seismic action, which is an effective method for obtaining the dynamic response of a structure under seismic action. A multi-point shaking table seismic simulation system consists of a channel and multiple shaking tables in the channel. When multiple shaking tables are located in one channel, the multiple shaking tables form a large linear shaking table group. The multiple shaking tables can also be distributed in two channels that are not on the same straight line. In this way, the shaking tables in the two channels together form a polygonal shaking table group, and this polygonal shaking table group is used as a large shaking table. This multi-point shaking table seismic simulation system can be applied to fields such as bridge engineering, building and space structures, underground engineering, lifeline engineering, and disaster prevention and mitigation engineering, providing a vibration and seismic simulation experimental platform for a wide range of civil engineering disciplines.

[0003] Due to the large designed vibration displacement of the shaking table and the direct support of the actuator on the side wall of the channel, the shaking table is far from the edge of the channel, resulting in the following two problems during the vibration test:

[0004] One is that it is not conducive to erecting a simple support scaffolding structure for sensor installation. If the sensor bracket is installed on the table surface, due to the bottom vibration, the top of the bracket is prone to large self-vibration, thus affecting the measurement results.

[0005] The second is that due to the large gap between the shaking table and the channel, sundries are easily dropped into the gap, which affects the test, and even leads to safety accidents and damage to the shaking table. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned existing technologies, and provide a protection bracket applicable to a shaking table test and an installation method thereof, which can improve the test ability and measurement level of the multi-point shaking table group, enhance the test safety and the service level of the laboratory, and has the advantages of good safety and high flexibility.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] A protective bracket applicable to shaking table tests. The protective bracket is of a truss structure and is used to protect the shaking table placed in a trough. It includes 2 longitudinal beams, 4 cross beams and at least 2 cantilever arms. The 4 cross beams include 2 main cross beams and 2 secondary cross beams. The 2 longitudinal beams are symmetrically placed on the ground on both sides of the trough along the direction of crossing the trough and are located on both sides of the shaking table. The 2 main cross beams are arranged along the direction of the trough on both sides of the shaking table, and both ends of each main cross beam are fixedly connected to the 2 longitudinal beams. The 2 secondary cross beams are respectively arranged side by side on the side of the 2 main cross beams facing the trough and are fixedly connected to the corresponding main cross beams. The 2 cantilever arms are respectively arranged side by side on the side of the 2 longitudinal beams facing the shaking table and are fixedly connected to the corresponding longitudinal beams. The protective bracket is a steel truss structure. The longitudinal beam is the main load-bearing component of the protective bracket, and the cross beam and the cantilever arm transfer the load they bear to the longitudinal beam;

[0009] The protective bracket is provided with a cover plate for covering the gaps between the trusses of the protective bracket. When the shaking table test is not carried out, a support can be temporarily set on the shaking table to support the cross beam. The test personnel can walk on the cover plate and carry out test operations. At the same time, test equipment, props and sundries can be placed on the cover plate; when the vibration test is carried out, the support is removed. The protective bracket can block the groove gap, prevent the debris falling from the test piece from damaging the shaking table cylinder. At the same time, test and measurement equipment can be installed at various positions of the protective bracket to avoid the influence of the shaking table test on the test equipment, and the vibration test data of the test piece can be observed and measured clearly and accurately.

[0010] Further, the rectangular area enclosed by the secondary cross beam and the cantilever arm is located directly above the shaking table surface. When the shaking table is at rest and at the maximum amplitude, the vertical projection plane of this rectangular area on the shaking table surface is included within the shaking table surface area, avoiding sundries from falling into the trough through the gaps.

[0011] Further, when the number of cantilever arms exceeds 2, except for the 2 cantilever arms connected to the 2 longitudinal beams, the remaining cantilever arms are symmetrically arranged side by side on the side of the 2 cantilever arms connected to the 2 longitudinal beams facing the shaking table. The number of cantilever arms can be selected according to the covered area of the test piece on the shaking table and the number of shaking tables to ensure that the protective bracket covers the shaking table to the greatest extent, so as to install test equipment at a close distance and completely block the gap between the shaking table and the trough.

[0012] Further, seamless steel pipes are provided at both ends of the upper chord of the main cross beam, and seamless steel pipes are provided at the connection positions of the longitudinal beam corresponding to one end of the main cross beam. The upper end of the main cross beam is fixedly connected to the longitudinal beam through the cooperation connection of the seamless steel pipe and the bolt; both ends of the lower chord of the main cross beam are fixedly connected to the 2 longitudinal beams through triangular plates.

[0013] Further, seamless steel pipes are provided on the upper chord rods of the main cross beam and the secondary cross beam arranged side by side, and the upper chord rod of the secondary cross beam is fixedly connected to the main cross beam through the cooperation connection of the seamless steel pipe and the bolt; supports are arranged on the longitudinal beam, and both ends of the lower chord rod of the secondary cross beam are placed on the supports of the two longitudinal beams.

[0014] Further, corresponding seamless steel pipes are provided at both ends of the upper chord rod of the cantilever and the upper chord rod of the longitudinal beam, and the upper chord rod of the cantilever is fixedly connected to the longitudinal beam through the cooperation connection of the seamless steel pipe and the bolt; equal-angle steel is welded on the lower chord rods of the cantilever and the longitudinal beam, and the equal-angle steel on the lower chord rod of the cantilever is placed on the equal-angle steel on the lower chord rod of the longitudinal beam.

[0015] An installation method of a protection bracket adopting the above-mentioned protection bracket suitable for a shaking table test includes:

[0016] S1: Place the two longitudinal beams across the groove on the ground on both sides of the groove;

[0017] S2: Select and install four cross beams with corresponding length dimensions according to the number of shaking tables in the groove;

[0018] S3: Select whether to install the secondary cross beam and the cantilever and the number of cantilevers according to the size of the specimen placed on the shaking table surface of the specimen, the vibration amplitude and the number of shaking tables;

[0019] Step S3 is specifically:

[0020] When the specimen on the shaking table surface is located in the central area of the shaking table and does not extend to the edge of the table surface, install the secondary cross beam and the cantilever, and at the same time select the number of cantilevers to ensure that the protection bracket covers the shaking table to the greatest extent, so as to install test equipment at close range and completely block the gap between the shaking table and the groove. When the shaking table vibrates at the maximum amplitude, the protection bracket can cover the entire active range of the shaking table; otherwise, do not install the secondary cross beam and the cantilever to ensure that the protection bracket does not collide with the shaking table.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) The present invention uses longitudinal beams, cross beams and cantilevers to assemble a protection bracket fixed on the ground adjacent to the grooves around the shaking table. The cross beam includes a main cross beam and a secondary cross beam. At the same time, a cover plate for covering the truss gap of the protection bracket is provided at the top of the protection bracket. Therefore, the protection bracket can block the gap between the shaking table and the groove, prevent sundries from falling into the groove and causing safety accidents and damage to the shaking table. At the same time, it is convenient to install test equipment at various positions of the protection bracket, avoid the influence of the shaking table test on the test equipment, and can clearly and accurately obtain the vibration test data of the specimen at close range;

[0023] (2) In the present invention, two secondary cross beams are connected to the main cross beam and longitudinal beam through seamless steel pipes and supports, and at least two cantilevers are connected to the longitudinal beam through seamless steel pipes and equal-angle steel. Whether to install the secondary cross beams and cantilevers can be selected according to the size of the test piece placed on the vibrating table surface and the vibration amplitude of the vibrating table. At the same time, the installation quantity of the cantilevers can be flexibly set, and the flexible protection bracket can adjust the size of the covered area to ensure that the protection bracket covers the vibrating table to the greatest extent, so as to facilitate the installation of test equipment at a close distance and completely block the gap between the vibrating table and the trough. It is applicable to test pieces of different sizes and different test requirements, with good flexibility;

[0024] (3) In the present invention, the main cross beam is fixed to the longitudinal beam through seamless steel pipes and triangular plates. The main cross beam has different length dimensions, which can be applicable to both single vibrating table tests and multi-point vibrating table group vibration tests, with good flexibility in assembly;

[0025] (4) In the present invention, a cover plate for covering a rectangular area is provided at the top of the protection bracket. When no test is being carried out, a support can be temporarily placed on the cross beam to support the cover plate. Construction workers can walk on the cover plate conveniently, and small equipment, tools, and sundries can also be placed on the cover plate, which is beneficial for installing test equipment and enclosing and adjusting the test piece;

[0026] (5) The protection bracket of the present invention is a steel truss structure, and the structure is a stable self-balanced structure. It can be directly placed on the ground, and the longitudinal beam does not need to be fixedly connected to the ground through bolts, and no additional ballast needs to be set, with good safety and convenient and flexible disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the protection bracket for a fully assembled single vibrating table;

[0028] Figure 2 Schematic diagram of the protection bracket for a partially assembled single vibrating table;

[0029] Figure 3 Schematic diagram of the protection bracket for a fully assembled double vibrating table;

[0030] Figure 4 Schematic diagram of the protection bracket for a partially assembled double vibrating table;

[0031] Figure 5 Partial structure diagram of the protection bracket;

[0032] Figure 6 Front view of the connection part of equal-angle steel;

[0033] Figure 7 Side view of the connection part of equal-angle steel.

[0034] Explanation of the reference numerals in the drawings:

[0035] 1. Longitudinal beam, 2. Main cross beam, 3. Secondary cross beam, 4. Cantilever, 5. Shaking table, 6. Equal angle steel, 7. High-strength bolt, 8. Triangular plate, 9. Support. Specific implementation mode

[0036] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0037] A protective bracket applicable to shaking table tests, using a steel truss structure, for protecting the shaking table 5 placed in the trough. It includes 2 longitudinal beams 1, 4 cross beams and at least 2 cantilevers 4. The 4 cross beams include 2 main cross beams 2 and 2 secondary cross beams 3. The 2 longitudinal beams 1 are symmetrically placed on the ground on both sides of the trough along the cross-trough direction and are located on both sides of the shaking table 5. The 2 main cross beams 2 are arranged along the along-trough direction on both sides of the shaking table 5, and both ends of each main cross beam 2 are fixedly connected to the 2 longitudinal beams 1. The 2 secondary cross beams 3 are respectively arranged side by side on one side of the 2 main cross beams 2 facing the trough and are fixedly connected to the corresponding main cross beams 2. The 2 cantilevers 4 are respectively arranged side by side on one side of the 2 longitudinal beams 1 facing the shaking table 5 and are fixedly connected to the corresponding longitudinal beams 1. The longitudinal beam 1 is the main stress-bearing member, and the cross beams and the cantilevers 4 transfer the loads they bear to the longitudinal beam 1.

[0038] A cover plate for covering the gaps between the trusses of the protective bracket is provided on the protective bracket. Except for its own weight, the cover plate can bear a uniform live load of 5 kN / m2. When the shaking test is not carried out, supports can be temporarily set on the shaking table 5 to support the cross beams. Test personnel can walk on the cover plate and carry out test operations. At the same time, test equipment, props and sundries can be placed on the cover plate. When the shaking test is carried out, the supports are removed. The protective bracket can block the groove gap, prevent the debris falling from the test piece from damaging the oil cylinder of the shaking table 5. At the same time, test and measurement equipment can be installed at various positions of the protective bracket to avoid the influence of the shaking test on the test equipment, and the vibration test data of the test piece can be observed clearly and accurately.

[0039] The table top size of the shaking table is 6m × 4m, the trough width is 9m, there is a distance of 1.5m from both sides of the shaking table 5 to the edge of the trough, the ground is higher than the table top of the shaking table 5. The main cross beam 2 has two sizes, and the length, width and height sizes are 5m × 1.44m × 0.6m and 11m × 1.44m × 0.6m respectively. The secondary cross beam 3 has two sizes, and the length, width and height sizes are 5m × 1.0m × 0.4m and 11m × 1.0m × 0.4m respectively. The main cross beam 2 and the secondary cross beam 3 are used in combination.

[0040] Figure 1Schematic diagram of the protection bracket for a completely assembled single shaking table 5. The protection bracket for the single shaking table 5 includes 2 longitudinal beams 1, 4 cross beams, and 2 cantilever arms 4. The length and width dimensions of the longitudinal beam 1 are 11 m × 1.0 m, the length, width, and height dimensions of the main cross beam 2 are 5 m × 1.44 m × 0.6 m, the length, width, and height dimensions of the secondary cross beam 3 are 5 m × 1.0 m × 0.4 m, and the length and width dimensions of the cantilever arm 4 are 5 m × 1.0 m.

[0041] The rectangular area enclosed by the 2 secondary cross beams 3 and the 2 cantilever arms 4 is located directly above the tabletop of the shaking table 5, and this rectangular area is included within the tabletop area of the shaking table both when the shaking table 5 is stationary and at its maximum amplitude.

[0042] Figure 3 Schematic diagram of the protection bracket for a completely assembled double shaking table 5. The protection bracket for the double shaking table 5 includes 2 longitudinal beams 1, 4 cross beams, and 4 cantilever arms 4. Except for the 2 cantilever arms 4 connected to the 2 longitudinal beams 1, the other 2 cantilever arms 4 are symmetrically arranged side by side on the side facing the shaking table of the 2 cantilever arms connected to the 2 longitudinal beams, and the cantilever arms 4 are connected by seamless steel pipes.

[0043] As Figure 5 , seamless steel pipes are provided at both ends of the upper chord of the main cross beam 2, and seamless steel pipes are provided at the connection positions of the longitudinal beam 1 corresponding to one end of the main cross beam 2. The upper end of the main cross beam 2 is fixedly connected to the longitudinal beam 1 through the cooperation connection of the seamless steel pipe and the M22 high-strength bolt 7;

[0044] Both ends of the lower chord of the main cross beam 2 are fixedly connected to the 2 longitudinal beams 1 through triangular plates 8;

[0045] Seamless steel pipes are provided at the same positions on the upper chords of the main cross beam 2 and the secondary cross beam 3 arranged side by side. The upper chord of the secondary cross beam 3 is fixedly connected to the main cross beam 2 through the cooperation connection of the seamless steel pipe and the M22 high-strength bolt 7;

[0046] Supports 9 are provided on the longitudinal beam 1, and both ends of the lower chord of the secondary cross beam 3 are placed on the supports 9 of the 2 longitudinal beams 1;

[0047] Corresponding seamless steel pipes are provided at both ends of the upper chord of the cantilever arm 4 and the upper chord of the longitudinal beam 1. The upper chord of the cantilever arm 4 is fixedly connected to the longitudinal beam 1 through the cooperation connection of the seamless steel pipe and the M22 high-strength bolt 7.

[0048] As Figure 6 and Figure 7 , equal-angle steel is welded on the lower chords of the cantilever arm 4 and the longitudinal beam 1, and the equal-angle steel on the lower chord of the cantilever arm 4 is placed on the equal-angle steel on the lower chord of the longitudinal beam 1.

[0049] Embodiment 2

[0050] A method for installing a protection bracket applicable to a shaking table test corresponding to Embodiment 1, including:

[0051] S1: Install the test piece on the tabletop of the shaking table 5, and place 2 longitudinal beams across the groove on the ground on both sides of the groove.

[0052] S2: Select 4 cross beams with corresponding length dimensions according to the number of shaking tables 5 in the groove and install them. After assembly, when the number of shaking tables 5 is 1, the structure diagram is Figure 2 , when the number of shaking tables 5 is 2, the structure diagram is Figure 4 ;

[0053] S3: Select whether to install the auxiliary cross beam 3 and the cantilever 4 according to the size of the test piece placed on the tabletop of the shaking table 5 and the vibration amplitude of the shaking table 5.

[0054] Step S3 is specifically as follows:

[0055] When the test piece on the tabletop of the shaking table 5 is located in the central area of the shaking table 5 and does not extend to the edge of the tabletop, install the auxiliary cross beam 3 and the cantilever 4. When the number of shaking tables 5 is 1, the structure diagram is Figure 1 , when the number of shaking tables 5 is 2, the structure diagram is Figure 3 , when the shaking table vibrates with the maximum amplitude of 0.5 m, the protection bracket can cover the entire active range of the shaking table 5; otherwise, do not install the auxiliary cross beam 3 and the cantilever 4. When the number of shaking tables 5 is 1, the structure diagram is Figure 2 , when the number of shaking tables 5 is 2, the structure diagram is Figure 4 , when the shaking table 5 vibrates with the maximum amplitude of 0.5 m, it can ensure that there is no collision with the protection bracket.

[0056] Example 1 and Example 2 propose a protection bracket and installation method applicable to the shaking table test, which further improves the test ability and measurement level of the multi-point shaking table group, improves the test safety and the service level of the laboratory. The protection bracket can be fixed on the ground adjacent to the groove around the shaking table. When the shaking table test is not carried out, a support can be temporarily set on the shaking table 5 to support the cross beam. The test personnel can walk and conduct experiments on the cover plate. At the same time, some test equipment, props and sundries can be placed on the cover plate; when the shaking table test is carried out on the shaking table 5, the protection bracket can block the groove gap to prevent the debris dropped from the test piece from damaging the oil cylinder of the shaking table 5. At the same time, the protection bracket can adjust the size of its covering area according to the size of the test piece and the vibration amplitude of the shaking table 5, with good safety and high flexibility.

[0057] The above has described in detail the preferred specific embodiments of the present invention. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the existing technology should be within the protection scope determined by the claims.

Claims

1. An installation method of a protection bracket applicable to a shaking table test, characterized in that, The installation method is implemented based on a protective bracket, which is used to protect the shaking table (5) placed in the trough. The protective bracket includes two longitudinal beams (1), two cross beams, and at least two cantilever arms (4). The cross beams include two main cross beams (2) and two secondary cross beams (3). The two longitudinal beams (1) are symmetrically placed on the ground on both sides of the trough along the direction of crossing the trough and are located on both sides of the shaking table (5). The two main cross beams (2) are arranged along the direction of the trough on both sides of the shaking table (5), and both ends of each main cross beam (2) are fixedly connected to the two longitudinal beams (1). The two secondary cross beams (3) are respectively fixedly connected side by side to one side of the two main cross beams (2) facing the trough. The two cantilever arms (4) are respectively fixedly connected side by side to one side of the two longitudinal beams (1) facing the shaking table (5). A cover plate for covering the gaps between the trusses of the protective bracket is provided on the protective bracket; Seamless steel pipes are provided at both ends of the upper chord of the main cross beam (2). Seamless steel pipes are provided at the connection positions of the longitudinal beam (1) corresponding to one end of the main cross beam (2). Both ends of the upper chord of the main cross beam (2) are fixedly connected to the longitudinal beam (1) through the cooperation connection of seamless steel pipes and bolts; Seamless steel pipes at the same positions are provided on the upper chords of the main cross beam (2) and the secondary cross beam (3) arranged side by side. The upper chord of the secondary cross beam (3) is fixedly connected to the main cross beam (2) through the cooperation connection of seamless steel pipes and bolts; Corresponding seamless steel pipes are provided at both ends of the upper chord of the cantilever arm (4) and the upper chord of the longitudinal beam (1). The upper chord of the cantilever arm (4) is fixedly connected to the longitudinal beam (1) through the cooperation connection of seamless steel pipes and bolts; The installation method includes: S1: Place the two longitudinal beams across the trough on the ground on both sides of the trough; S2: Select four cross beams with corresponding length dimensions according to the number of shaking tables (5) in the trough and install them; S3: Select whether to install the secondary cross beam (3) and the cantilever arm (4) and the number of cantilever arms (4) according to the size of the test piece placed on the table surface of the shaking table (5) and the vibration amplitude of the shaking table (5); Step S3 is specifically: When the test piece on the table surface of the shaking table (5) is located in the central area of the shaking table (5) and does not extend to the edge of the table surface, install the secondary cross beam (3) and the cantilever arm (4), otherwise do not install the secondary cross beam (3) and the cantilever arm (4).

2. The installation method of a protection bracket applicable to a shaking table test according to claim 1, characterized in that, The rectangular area enclosed by the secondary cross beam (3) and the cantilever arm (4) is located directly above the table surface of the shaking table (5). When the shaking table (5) is at rest and at the maximum amplitude, the vertical projection surface of this rectangular area on the table surface of the shaking table (5) is included in the table surface of the shaking table (5).

3. The installation method of a protection bracket applicable to a shaking table test according to claim 1, characterized in that When the number of cantilever arms (4) exceeds two, except for the two cantilever arms (4) connected to the two longitudinal beams (1), the remaining cantilever arms (4) are symmetrically arranged side by side on one side of the two cantilever arms (4) connected to the two longitudinal beams (1) facing the shaking table (5).

4. The installation method of a protection bracket applicable to a shaking table test according to claim 1, characterized in that Both ends of the lower chord of the main cross beam (2) are fixedly connected to the two longitudinal beams (1) through triangular plates (8).

5. The installation method of a protection bracket applicable to a shaking table test according to claim 1, characterized in that, Supports (9) are provided on the longitudinal beam (1). Both ends of the lower chord of the secondary cross beam (3) are placed on the supports (9) of the two longitudinal beams (1).

6. The installation method of a protection bracket applicable to a shaking table test according to claim 1, characterized in that, Equal-angle steel is welded to the lower chord of the cantilever (4) and the longitudinal beam (1), and the equal-angle steel on the lower chord of the cantilever (4) is placed on the equal-angle steel on the lower chord of the longitudinal beam (1).

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