CN111610047A - Combined structure bridge static load test bench - Google Patents

Abstract

The embodiment of the invention discloses a static load test bed of a composite structure bridge, which consists of a plurality of structural members, wherein the structural members can be disassembled and comprise a lever beam, a vertical pull rod, an end cross beam, a reaction frame and a test beam, wherein the lever beam is placed on the ground, one end of the vertical pull rod is connected with the lever beam, the other end of the vertical pull rod is connected with the end cross beam, two ends of the reaction frame are arranged on the end cross beam, the test beam is placed between the lever beam and the reaction frame, the test bed is suitable for tests of various beam types and spans by adjusting the layer number of the reaction frame and the end cross beam, the assembling process is simplified through reasonable structural design, the structural rigidity is enhanced, the integral deformation of the test bed is reduced, and the test bed is economical, practical and material-saving.

Description

Combined structure bridge static load test bench

The present application claims priority of the chinese patent application with the title "a composite structure bridge static load test bench" filed by the chinese intellectual property office of china, application No. 2019112619782, on 12/10/2019, the entire contents of which are incorporated herein by reference.

Technical Field

The invention relates to the technical field of bridge static load tests, in particular to a composite structure bridge static load test bed.

Background

In bridge construction engineering, a certain number of manufactured bridges need to be extracted for static load tests so as to ensure that the quality of the manufactured bridges meets the relevant technical requirements. The static load test bed is a device for providing test load for the static load test of the bridge. The static load test bench of using at present is 32m simply supported case roof beam design, can't satisfy the experimental requirement of novel 40m simply supported case roof beam, and the 40m simply supported case roof beam static load test bench that adopts conventional structural style to develop has following shortcoming:

(1) the structure design is unreasonable, the self weight is large, and the transportation is inconvenient;

(2) the test bed has a plurality of structural members and large assembling workload;

(3) the whole rigidity of the structure is weak, the deformation is not easy to control, and the requirement on loading equipment is high.

Disclosure of Invention

In view of this, the embodiment of the invention provides a static load test bed for a composite bridge, which is convenient to assemble, can fully utilize material characteristics, has small structural deformation, and can be suitable for various beam types and spans.

The embodiment of the invention provides a static load test bed for a composite structure bridge, which comprises:

the reaction frame is arranged above the test beam and is used for applying static load pressure to the test beam;

four lever beams placed on the ground;

the two end cross beams are fixedly connected with one end part of the reaction frame; and

a plurality of vertical tie rods detachably connecting the end cross member and the lever beam;

the reaction frame is assembled in a segmented mode in the longitudinal direction, the end cross beam comprises a plurality of segments, and the segments are connected with one another through bolting, welding or pin connection.

Preferably, the reaction frame comprises an upper reaction frame and a lower reaction frame, the upper reaction frame is of a steel tower and upper pull rod combined structure, and the lower reaction frame is of a truss structure.

Preferably, the height of the upper reaction frame or the lower reaction frame is 2.5 to 3.35 meters.

Preferably, the connection mode of the steel tower in the upper reaction frame and the upper pull rod is pin joint, bolt joint or welding, and the connection mode of the upper reaction frame and the lower reaction frame is pin joint or bolt joint.

Preferably, the steel tower comprises diagonal draw bars, vertical web members, transverse connecting rods and diagonal compression bars;

the diagonal draw bar, the diagonal compression bar and one end of the corresponding vertical web member are connected, the other end of the diagonal draw bar and the other end of the vertical web member are in contact with the lower reaction frame below the diagonal draw bar, and the transverse connecting rod is connected with the diagonal draw bars which are parallel to each other or the diagonal compression bars which are parallel to each other.

Preferably, the cross link is an "X" shaped bar or a single bar.

Preferably, the upper layer pull rod is formed by section steel, steel strands or a combination of the section steel and the steel strands.

Preferably, the connecting position of the vertical pull rod and the end cross beam is adjustable.

Preferably, the composite structure bridge static test bed further comprises:

and the anti-torsion supporting leg is fixedly connected with the lever beam and is used for providing anti-torsion support for the composite structure bridge static load test bed.

The static load test bed for the composite structure bridge is composed of a plurality of structural parts, wherein the structural parts can be disassembled and comprise a lever beam, a vertical pull rod, an end cross beam, a reaction frame and a test beam, the lever beam is placed on the ground, one end of the vertical pull rod is connected with the lever beam, the other end of the vertical pull rod is connected with the end cross beam, two ends of the reaction frame are installed on the end cross beam, the test beam is placed between the lever beam and the reaction frame, the test bed is suitable for tests of various beam types and spans by adjusting the layer number of the reaction frame and the end cross beam, the assembling process is simplified through reasonable structural design, the structural rigidity is enhanced, the integral deformation of the test bed is reduced, the test bed is economical and practical, and materials are saved.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

FIG. 1 is a front view of a composite structure bridge static test bed according to an embodiment of the present invention applied to a box girder;

FIG. 2 is a side view of a composite structural bridge static test bed of an embodiment of the present invention as applied to a box girder;

FIG. 3 is a front view of an upper reaction frame of a composite structural bridge static test bed according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of a steel tower of a composite structural bridge static test stand according to an embodiment of the present invention;

FIG. 5 is a front view of an end cross member of the composite structural bridge static test bed of the embodiment of the present invention;

FIG. 6 is a top view of an end beam of the composite structural bridge static test bed of an embodiment of the present invention;

FIG. 7 is a schematic view of a connecting structure of a lever beam and a torsion-resistant leg of the static load test bed of the composite structural bridge according to the embodiment of the invention;

FIG. 8 is a side view of a composite structural bridge static test rig of an embodiment of the present invention as applied to a T-beam;

description of reference numerals:

1-reaction frame; 1.1-steel tower; 1.11-diagonal draw bar; 1.12-vertical web member; 1.13-transverse link; 1.14-oblique compression bar; 1.2-upper layer pull rod; 1.3-truss; 2-a test beam; 3-a lever beam; 3.1-anti-torque legs; 4-end cross beam; 5-vertical pull rod; 6-jacks.

Detailed Description

The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.

Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".

In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Spatially relative terms, such as "inner," "outer," "below," "lower," "above," "upper," and the like, are used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the example term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Fig. 1 is a front view of a composite structural bridge static test bed according to an embodiment of the present invention applied to a box girder, and fig. 2 is a side view of the composite structural bridge static test bed according to the embodiment of the present invention applied to the box girder. As shown in fig. 1-2, the composite structure bridge static load test bed comprises a reaction frame 1, a test beam 2, a lever beam 3, an end cross beam 4 and a vertical pull rod 5. The lever beam 3 is placed on the ground, one end of the vertical pull rod 5 is connected with the lever beam 3, the other end of the vertical pull rod is connected with the end cross beam 4, two ends of the reaction frame 1 are installed on the end cross beam 4, and the test beam 2 is placed between the lever beam 3 and the reaction frame 1.

The reaction frame 1 has a total height of 2.5-6.7 m and a single-layer height of 2.5-3.35 m, and in the embodiment of the invention, the reaction frame 1 comprises an upper reaction frame and a lower reaction frame. Preferably, the height of each layer of the upper layer reaction frame and the lower layer reaction frame is 3.0m, the upper layer reaction frame is of a combined structure of a steel tower 1.1 and an upper layer pull rod 1.2, and the lower layer reaction frame is of a truss 1.3 structure.

Specifically, fig. 3 is a front view of an upper reaction frame of the composite structure bridge static test bed according to the embodiment of the present invention, and fig. 4 is a schematic view of a steel tower of the composite structure bridge static test bed according to the embodiment of the present invention. As shown in fig. 3-4, the upper reaction frame includes a plurality of steel towers 1.1 and an upper tie rod 1.2, the steel towers 1.1 include diagonal tie bars 1.11, vertical web members 1.12, horizontal tie bars 1.13 and diagonal tie bars 1.14, wherein, the diagonal tie bars 1.11, the diagonal tie bars 1.14 and the corresponding vertical web members 1.12 are connected at one end, the other end contacts with the lower reaction frame below, and the horizontal tie bars 1.13 connect the diagonal tie bars 1.11 parallel to each other or the diagonal tie bars 1.14 parallel to each other. In an embodiment of the present invention, the cross link 1.13 may be "X" shaped as shown in FIG. 4. Alternatively, the transverse link 1.13 can also be a single bar. The upper layer pull rod 1.2 and the transverse connecting rod 1.13 can adopt section steel, steel strand or combined cross section, prestress can be applied to the steel strand as required, the connecting mode of the steel tower 1.1 and the upper layer pull rod 1.2 in the upper layer reaction frame is pin joint, bolt joint or welding, the upper layer reaction frame and the lower layer reaction frame adopt bolt joint or bolt joint, and of course, the technical personnel in the field can also adopt other fixed connecting modes capable of ensuring the connecting strength, such as pin joint and the like.

In the embodiment of the invention, the reaction frame 1 comprises a plurality of lower reaction frames which are arranged in a stacked mode, and the number of layers of the reaction frames is adjusted to be suitable for tests of various beam types and spans. When carrying out conventional static load test, can only set up lower floor's reaction frame, upper strata reaction frame is not connected with lower floor's reaction frame, only sets up lower floor's reaction frame and is enough to bear conventional static load test's load. When the static load test of heavy load, like the destructive test of test roof beam 2, be connected upper reaction frame and lower floor reaction frame, increase the intensity of reaction frame for reaction frame 1 can bear heavier test load. If necessary, the person skilled in the art can increase the number of lower reaction frames to further increase the stiffness of the reaction frame 1, so that it can withstand greater test loads. Of course, after the upper reaction frame and the lower reaction frame are connected, the static load test bed of the composite structure bridge can also perform the conventional static load test of the test beam 2.

In the embodiment of the invention, the reaction frame 1 is assembled in sections in the longitudinal direction, so that the assembling process is simplified.

The two end beams 4 are respectively arranged below the two ends of the reaction frame 1, and the connection mode can adopt a hinged connection mode or other connection modes which are convenient for adjusting the positions of the end beams 4. The end cross beam 4 can be one of box girder, section steel beam, truss or girder and truss composite structure, and the vertical pull rod 5 can be steel plate, section steel, steel strand and other materials capable of bearing larger pulling force.

In an embodiment of the invention, the end beam comprises a plurality of segments, which are interconnected by bolting, welding or pinning, and the static load test of different beam types can be adapted by using different segments.

Fig. 5 is a front view of an end cross member of the composite-structure bridge static test bed according to the embodiment of the present invention, and fig. 6 is a plan view of the end cross member of the composite-structure bridge static test bed according to the embodiment of the present invention. As shown in fig. 5 to 6, the end cross beam 4 is provided with a plurality of holes through which the vertical pull rods 5 can pass, one ends of the vertical pull rods 5 are fixed by nuts after passing through the holes of the end cross beam 4, the other ends of the vertical pull rods 5 are fixed by nuts after passing through the holes of the lever beams 3, and the vertical pull rods 5 bear tensile force during static load test. The vertical pull rod 5 is fixed through the end cross beam 4, so that holes can be prevented from being formed in the test beam 2, and unnecessary damage to the test beam 2 is caused. Other forms of attachment of the vertical tie 5 may be devised by those skilled in the art.

In the embodiment of the invention, the number of layers of the reaction frame and the assembling mode of the end cross beam are adjusted to be suitable for tests of various beam types and spans.

In the embodiment of the invention, the connecting position of the vertical pull rod 5 and the end cross beam 4 is adjustable. The arrangement position of the vertical pull rod 5 can reduce the bending deformation of the reaction frame, and the overall rigidity of the reaction frame 1 is improved.

The lever beam 3 has a shoe-like shape and a large support surface, and can ensure sufficient support force. Four lever roof beams 3 place subaerial, independent separately, do not interconnect into a whole to can be convenient for adjust the position of lever roof beam 3 in order to adapt to the position of 2 webs of test beam, and can guarantee to erect pull rod 5 and end crossbeam 4 and lever roof beam 3 and keep perpendicular, prevent to erect pull rod 5 and receive great transverse shear force and destroyed in the testing process, thereby guarantee the safety of testing process.

In addition, in the bridge static load test, the bridge static load test bed further comprises a jack 6, wherein the jack 6 is fixedly connected below the reaction frame 1, placed on the test beam 2 and configured to apply load to the test beam 2. In the process of the bridge static load test, the transmission route of the test load output by the jack 6 is as follows: the jack 6, the reaction frame 1, the end cross beam 4, the vertical pull rod 5, the lever beam 3, the test beam 2 and the jack 6 realize the balance of internal force in a system consisting of the bridge static load test bed and the test beam 2.

In the embodiment of the invention, the composite structure bridge static load test bed further comprises an anti-torsion leg 3.1.

FIG. 7 is a schematic view of a connecting structure of a lever beam and a torsion-resistant leg of the static load test bed of the composite structure bridge according to the embodiment of the invention. As shown in fig. 7, the anti-torsion leg 3.1 is fixedly connected to the lever beam 3 for providing an anti-torsion support for the composite structure bridge static load test bed, and the lever beam 3 and the anti-torsion leg 3.1 may be connected by bolts, pins or other connection means. The anti-torsion supporting legs 3.1 are arranged to provide lateral support for the lever beam 3, the problem that the stress on two sides of the lever beam 3 is uneven can be solved, and the stability of the composite structure bridge static load test bed is enhanced.

In the embodiment of the invention, the structural members are connected by pins or bolts, when the static load test bed with the combined structure is assembled, the assembly process is simplified, the reasonable structural design is adopted, the structural rigidity is enhanced, the integral deformation of the test bed is reduced, and the invention is economical and practical and saves materials.

FIG. 8 is a side view of the composite structural bridge static test stand of the embodiment of the invention when applied to a T-beam. As shown in fig. 8, the connection of the static load test bed of the composite structure bridge is completed by adjusting the assembling mode of the end cross beams and the installation position of the vertical pull rod. In particular, the connection can be made by distributing the vertical tie 5 in different positions on one of the end beams 4, using two segments, left and right, of said end beam.

The static load test bed for the composite structure bridge comprises a plurality of structural parts, wherein the structural parts can be disassembled and comprise a lever beam, a vertical pull rod, an end cross beam, a reaction frame and a test beam, the lever beam is placed on the ground, one end of the vertical pull rod is connected with the lever beam, the other end of the vertical pull rod is connected with the end cross beam, two ends of the reaction frame are installed on the end cross beam, the test beam is placed between the lever beam and the reaction frame, the test beam is suitable for tests of various beam types and spans by adjusting the layer number of the reaction frame and the end cross beam, the assembling process is simplified through reasonable structural design, the structural rigidity is enhanced, the integral deformation of the test bed is reduced, the test bed is economical and applicable, and materials are saved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a composite structure bridge static test platform which characterized in that includes:

the reaction frame (1) is arranged above the test beam (2) and is used for applying static load pressure to the test beam (2);

four lever beams (3) placed on the ground;

two end cross beams (4), wherein each end cross beam (4) is fixedly connected with one end part of the reaction frame (1); and

a plurality of vertical tie rods (5) connecting said end cross member (3) and said lever beam (4) in a removable manner;

the reaction frame (1) is assembled in a segmented mode in the longitudinal direction, the end cross beam (4) comprises a plurality of segments, and the segments are connected with one another through bolting, welding or pin connection.

2. The composite structure bridge static test bed according to claim 1, wherein the reaction frame (1) comprises an upper reaction frame and a lower reaction frame, the upper reaction frame is a steel tower (1.1) and upper tie rod (1.2) combined structure, and the lower reaction frame is a truss (1.3) structure.

3. The composite structural bridge static test bed of claim 2, wherein the height of the upper reaction frame or the lower reaction frame is 2.5 meters to 3.35 meters.

4. The composite structure bridge static test bed according to claim 2, wherein the steel tower (1.1) and the upper layer pull rod (1.2) are connected by pins, bolts or welding, and the upper layer reaction frame and the lower layer reaction frame are connected by pins or bolts.

5. The composite structure bridge static test bed according to claim 2, wherein the steel tower (1.1) comprises diagonal draw bars (1.11), vertical web members (1.12), transverse connecting bars (1.13) and diagonal press bars (1.14);

one end of a group of diagonal draw bars (1.11), the diagonal compression bars (1.14) and the vertical web members (1.12) are connected with each other, the other end of the diagonal draw bars is in contact with the lower reaction frame below the diagonal draw bars, and the transverse connecting rods are connected with the diagonal draw bars (1.11) which are parallel to each other or the diagonal compression bars (1.14) which are parallel to each other.

6. The composite structural bridge dead-load test bed according to claim 5, characterized in that the cross-connecting rod (1.13) is an "X" type bar or a single bar.

7. The composite structure bridge static test bench of claim 2, characterized in that the upper tension rod (1.2) is a section steel, a steel strand or a combination of section steel and steel strand.

8. The composite structure bridge static test bed according to claim 1, wherein the connecting position of the vertical pull rod (5) and the end cross beam (4) is adjustable.

9. The composite structural bridge static test stand of claim 1, further comprising:

and the anti-torsion supporting leg (3.1) is fixedly connected with the lever beam (3) and is used for providing anti-torsion support for the static load test bed of the composite structure bridge.

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