CN217237148U

CN217237148U - Box girder type bridge segment model internal framework for high wind speed test

Info

Publication number: CN217237148U
Application number: CN202221138023.5U
Authority: CN
Inventors: 靖洪淼; 刘庆宽; 孙一飞; 王仰雪
Original assignee: Shijiazhuang Tiedao University
Current assignee: Shijiazhuang Tiedao University
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2022-08-19
Anticipated expiration: 2032-05-12

Abstract

The utility model discloses a box girder type bridge segment model internal framework for high wind speed test, belonging to the technical field of bridge engineering wind tunnel test, comprising cross section frameworks which are arranged at intervals along the bridge length direction, wherein each cross section framework comprises a vertical support framework and an outer contour framework which is consistent with the outer contour shape of the cross section of a bridge girder, the two ends of the vertical support framework are respectively connected with the upper contour and the lower contour of the outer contour framework, and the outer contour frameworks of two adjacent cross section frameworks are connected through a longitudinal connecting piece; the cross-section framework and the longitudinal connecting piece jointly form an internal framework with a mature supporting system, which can play a role of a template when an external mold is built, and can provide supporting force for a model shell in the radial direction and the axial direction from the inside of the model, so that the rigidity and the strength of the bridge section model are improved, and a wind tunnel experiment under a high wind speed condition is met.

Description

Box girder type bridge segment model internal framework for high wind speed test

Technical Field

The utility model relates to a bridge engineering wind tunnel test technical field especially relates to a box girder formula bridge segment model internal framework for high wind speed is experimental.

Background

The wind tunnel test of the bridge girder segment model is an important means for researching the wind resistance of the large-span bridge, and is an important method for researching the wind-induced vibration (galloping, fluttering, buffeting and vortex-induced vibration) of the bridge. The bridge girder segment model is placed on a wind tunnel experimental device, and the vertical flutter measurement component and the torsional flutter measurement component drive the girder segment model to do torsional motion or vertical flutter, so that the vibration condition of the girder segment model in response to wind pressure in various wind directions is simulated. The invention discloses a rigid model wind tunnel test device for a bridge girder section model based on a magnetic suspension principle, which comprises two groups of suspension support devices with the same structure, wherein the two groups of suspension support devices are respectively connected with two ends of the rigid model of the bridge girder section and are symmetrically arranged with each other, each group of suspension support devices respectively comprises a wind attack angle adjusting plate, a support frame, a vertical flutter measuring component and a torsional flutter measuring component, the wind attack angle adjusting plate is fixed outside the side wall of the wind tunnel, the support frame is arranged on the wind attack angle adjusting plate through the vertical flutter measuring component and can move along the vertical direction, and the torsional flutter measuring component is arranged on the support frame and is connected with the rigid model of the bridge girder section.

However, in the existing wind tunnel test of the bridge girder segment model or the wind tunnel test device of the rigid model of the bridge girder disclosed in the above patent, the bridge girder segment model used in the test has low requirements on the strength and rigidity of the model because the test wind speed of the corresponding simulation is low, so that the inner framework can not be arranged in the model to support the model shell during the manufacturing process, but the rigidity and the strength are provided only by the model shell, and at most, the shaping frame made of the wood plate and the foam for shaping can be left in the model shell to simply support when the model is erected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving above-mentioned technical problem, the utility model provides a box girder formula bridge segment model internal framework for high wind speed is experimental, the outline skeleton of cross-section skeleton is the same with bridge stage cross-section outline, thereby can enough provide the template effect when putting up the model, can follow the model inside again and provide the support of model shell in radial, the internal framework that cross-section skeleton and longitudinal tie connect the back and constitute can provide a ripe support system, thereby improve the rigidity and the intensity of model, in order to satisfy the wind tunnel experiment of high wind speed.

In order to achieve the above object, the utility model provides a following scheme: the utility model discloses an experimental box girder formula bridge segment model inside skeleton of using of high wind speed, include the cross-section skeleton of arranging along the direction interval of bridge length, the cross-section skeleton include vertical support skeleton and with the unanimous outline skeleton of bridge girder cross-section outline shape, vertical support skeleton's both ends respectively with the last outline and the lower profile connection of outline skeleton, adjacent two the cross-section skeleton the outline skeleton passes through the longitudinal tie and connects.

Preferably, the cross-section skeleton still includes horizontal support skeleton, horizontal support skeleton's both ends respectively with the last profile of outer contour skeleton with the juncture at the lower profile both ends of outer contour skeleton is connected.

Preferably, the section framework is formed by welding angle steels.

Preferably, the longitudinal connecting piece comprises an upper connecting angle steel and a lower connecting angle steel, the upper connecting angle steel is respectively connected with the upper contour of the outer contour framework and the upper end of the vertical supporting framework, and the lower connecting angle steel is respectively connected with the lower contour of the outer contour framework and the lower end of the vertical supporting framework.

Preferably, the section framework at the head end is sequentially connected to the long connecting angle steel of the section framework at the tail end, and two angle steel planes of the long connecting angle steel are respectively connected with the vertical supporting framework and the transverse supporting framework.

Preferably, still include railing base, railing base is followed the bridge length direction from the head end the cross-section skeleton connects gradually to the tail end the cross-section skeleton, railing base is located the top surface of the last profile of outline skeleton.

Preferably, the section frameworks at the head end and the tail end are respectively provided with a model supporting arm used for being connected with the wind tunnel experiment device.

Preferably, the former support arms comprise support steel tubes.

The utility model discloses for prior art gain following technological effect:

1. the utility model provides an inside skeleton comprises cross-section skeleton and longitudinal tie, the outline skeleton of cross-section skeleton is the same with the outline of girder segment section, thereby can follow the inside of model and give the radial ascending support of model, after longitudinal tie is connected to the outline skeleton of cross-section skeleton together, alright form a whole skeleton, thereby then can strengthen the support of model axial direction, increase the intensity and the rigidity of bridge segment model, compare in the inside preparation mode that does not have the support chassis of traditional model, the model of this inside skeleton has been adopted, can satisfy high wind speed test condition needs.

2. The utility model provides an inside skeleton is simple relatively, easily processes to the operation such as the installation of the external mold and the pressure cell of the later stage model of being convenient for is arranged and railing installation dismantlement.

3. The utility model provides an inside skeleton main part comprises the angle steel, and the angle steel has the plane, compares the pipe overlap joint of being convenient for, welding or bolted connection, and the angle steel quality is light, compares the pipe simply easily accessible, moreover because the peripheral later stage of skeleton need wrap up the external mold, compares pipe and square pipe, and the angle steel is convenient for set up the riveting.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

FIG. 1 is a schematic perspective view of an internal skeleton;

FIG. 2 is a side view of a cross-sectional armature;

FIG. 3 is a side view of a cross-sectional armature with rails;

FIG. 4 is a top view of a portion of the internal skeleton at the bottom panel of the model;

FIG. 5 is a schematic view of the connection of the support steel tube to the internal frame.

Description of the reference numerals: 1. a cross-sectional skeleton; 2. an outer contour framework, 3, a vertical supporting framework; 4. a transverse support frame; 5. upper connecting angle steel; 6. a lower connecting angle steel; 7. long connecting angle steel; 8. a railing base; 10. an outer mold; 11. supporting the steel pipe; 12. a roadway rail; 13. a sidewalk balustrade; 14. and (7) reinforcing angle steel.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment discloses box girder type bridge section model internal framework for high wind speed test, as shown in fig. 1 to 5, the box girder type bridge section model internal framework comprises a plurality of section frameworks 1 which are arranged at intervals along the bridge length direction, each section framework 1 comprises an outer contour framework 2 and a vertical support framework 3, and two ends of each vertical support framework 3 are respectively connected with an upper contour and a lower contour of the outer contour framework 2 so as to provide enough support for the outer contour framework 2 in the vertical direction, and the connection mode is preferably welded. The outer contour framework 2 is vertically supported by the vertical supporting framework 3 so as to ensure that the cross-section framework 1 has enough rigidity and strength in the vertical direction. The outer contour of the outer contour framework 2 is consistent with the outer contour of the section of the bridge girder, and the outer contour framework can be conveniently used as a template to conveniently build the outer mold 10 of the bridge girder section and can also provide radial support for the outer mold 10 from the interior of the model. The outer contour frameworks 2 of two adjacent section frameworks 1 are connected through longitudinal connecting pieces, and after the longitudinal connecting pieces are used for connection, a plurality of section frameworks 1 form a whole, so that the supporting force on the opposite length direction of the bridge body, namely the axial supporting force, is provided. Therefore, under the support of the radial and axial supporting force of the inner framework, the rigidity and the strength of the box girder type bridge section model can be greatly improved, the simulation of high wind speed conditions is met, and the high wind speed impact of more than 70m/s is resisted.

The following provides an example of a specific manufacturing process, wherein the quantities and parameters are only one example of the specific manufacturing process and are not limited to the following values. Specifically, a bridge girder segment model can be manufactured according to a geometric scale ratio of 1:15, twelve section frameworks 1 are prepared in advance, the width of the whole section framework 1 is 2.13m, the height of the whole section framework is 0.234m, and then the section frameworks are arranged according to the interval of 0.5m and are connected by longitudinal connecting pieces. Because the wind pressure is great, the requirement on the strength of the external mold 10 is very high, and the external mold 10 can be manufactured by building and manufacturing an aluminum alloy plate with the thickness of 1.5mm and riveting the aluminum alloy plate with the section framework 1 through rivets. Through finite element method modeling analysis, the deformation of the model is in millimeter level under the action of aerodynamic force when the wind speed of the wind tunnel is 70m/s, and the deformation of the model in various forms such as transportation, hoisting and the like also meets the requirements.

Further, in this embodiment, as shown in fig. 1 to 5, the cross-section frame 1 further includes a lateral support frame 4, and two ends of the lateral support frame 4 are respectively connected to the junction points of two ends of the upper profile of the outer profile frame 2 and two ends of the lower profile of the outer profile frame 2, preferably in a welding connection manner. The outer contour framework 2 is horizontally and transversely supported by the transverse supporting framework 4 so as to ensure that the cross-section framework 1 has enough rigidity and strength in the transverse direction.

In this embodiment, the cross-section frame 1 may be formed by welding angle steels, that is, the outer contour frame 2, the vertical support frame 3, and the horizontal support frame 4 are all angle steels. During welding, the angle steel plane of the angle steel needs to be outward, so that the outer die 10 can be riveted on the angle steel in the later period. The section framework 1 is preferably made of L40 multiplied by 3 angle steel.

In this embodiment, as shown in fig. 1 to 5, the longitudinal connecting member includes an upper connecting angle 5 and a lower connecting angle 6 for connecting two adjacent section frameworks 1. The angle steel plane of the upper connecting angle steel 5 is respectively connected with the upper contour of the outer contour framework 2 and the upper end of the vertical supporting framework 3, and the connecting mode can adopt welding or riveting. Two angle steel planes of the lower connecting angle steel 6 are respectively connected with the lower contour of the outer contour framework 2 and the lower end of the vertical supporting framework 3, and the connecting mode can adopt welding or riveting. Preferably, three upper tie bars 5 and three lower tie bars 6 are used, and L40 × 3 bars are used for the upper tie bars 5 and the lower tie bars 6. Referring to fig. 2 and 3, the left angle steel plane of the three upper angle steel 5 is connected to the left side of the left vertical support frame 3 and the bottom surface of the upper contour of the outer contour frame 2, the right angle steel plane of the right upper angle steel 5 is connected to the right side of the right vertical support frame 3 and the bottom surface of the upper contour of the outer contour frame 2, the end of the middle upper angle steel 5 is directly welded to the top of the middle vertical support frame 3, and the middle upper angle steel plane of the upper angle steel 5 is connected to the bottom surface of the upper contour of the outer contour frame 2. The angle steel plane of the left side in the three lower angle steel 6 is connected with the left side of the left vertical support frame 3 and the top surface of the lower contour of the outer contour frame 2, the angle steel plane of the right lower angle steel 6 is connected with the right side of the right vertical support frame 3 and the top surface of the lower contour of the outer contour frame 2, the end part of the middle lower angle steel 6 is directly welded with the bottom of the middle vertical support frame 3 into a whole, and the angle steel plane of the middle lower angle steel 6 is connected with the top surface of the lower contour of the outer contour frame 2.

Further, in this embodiment, as shown in fig. 1 to 5, a long angle 7 is further included, and the long angle 7 is sequentially connected to the section frame 1 at the tail end from the section frame 1 at the head end. Two angle steel planes of the long connecting angle steel 7 are respectively connected with the vertical supporting framework 3 and the transverse supporting framework 4, and the connecting mode can adopt welding or riveting. Preferably, there are a total of two long connecting angles 7, the two long connecting angles 7 are respectively located at two sides of the upper connecting angle 5 and the lower connecting angle 6, referring to fig. 2 and 3, two angle planes of the left long connecting angle 7 are respectively connected with the right side surface of the left vertical supporting framework 3 and the top surface of the horizontal supporting framework 4, and two angle planes of the right long connecting angle 7 are respectively connected with the left side surface of the right vertical supporting framework 3 and the top surface of the horizontal supporting framework 4.

In this embodiment, as shown in fig. 1 to 5, the guardrail device further includes a guardrail base 8, the guardrail base 8 is sequentially connected to the cross-section frame 1 at the tail end from the cross-section frame 1 at the head end along the bridge length direction, the guardrail base 8 is located on the top surface of the upper contour of the outer contour frame 2, and the connection manner is welding. Preferably, the balustrade base 8 can be made of rectangular steel sheet, the balustrade base 8 can be formed by drilling bolt holes for fixing balustrades on the rectangular steel sheet, and the sidewalk balustrade 13 and the roadway balustrade 12 are fixed on the rectangular steel sheet through the bolt holes and the bolt holes. Of course, if the bending strength of the rectangular steel sheet is not enough, the railing base 8 can be changed into L30 multiplied by 4 or L40 multiplied by 5 equilateral angle steel. Specifically, set up six railing bases 8 altogether, two sets up in the middle part of the last profile of outline skeleton 2, and remaining four sets up respectively in the both ends edge of the last profile of outline skeleton 2, wherein install pavement railing 13 on two railing bases 8 in the outside of outline skeleton 2 both ends, and lane railing 12 is all installed to remaining railing base 8.

Further, in this embodiment, as shown in fig. 1 to 5, model support arms are installed on the cross-sectional frameworks 1 at the head end and the tail end, and are used for being connected with a wind tunnel experiment device, and the wind tunnel experiment can be performed by installing the internal framework on the wind tunnel experiment device through the model support arms.

Further, in this embodiment, as shown in fig. 1 to 5, the model supporting arm includes a supporting steel tube 11, and the supporting steel tube 11 may be a DN150 galvanized steel tube, and if the strength of the DN150 galvanized steel tube is not sufficient, a thicker and thicker specification galvanized steel tube may be selected. Support steel pipe 11 welding on the cross-section skeleton 1 at head and tail both ends, in order to guarantee joint strength, support steel pipe 11 can be at one-level cross-section skeleton 1 of inwards extending, and the support steel pipe 11 of head end cross-section skeleton 1 department simultaneously with head end cross-section skeleton 1 and at the welding of next cross-section skeleton 1 promptly, the support steel pipe 11 of tail end cross-section skeleton 1 department simultaneously with tail end cross-section skeleton 1 and the welding of last cross-section skeleton 1. The support steel pipe 11 is welded with the upper connecting angle 5 and the lower connecting angle 6 in the middle part at the same time, and is also welded with the transverse support framework 4 through the reinforcing angle steel 14, so that the connection strength is improved.

The utility model discloses a concrete example is applied to explain the principle and the implementation mode of the utility model, and the explanation of the above example is only used to help understand the method and the core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims

1. The utility model provides an experimental box girder formula bridge segment model internal framework that uses of high wind speed which characterized in that, includes the cross-section skeleton of arranging along the direction interval of bridge length, the cross-section skeleton include vertical support skeleton and with the outer contour skeleton of bridge girder cross-section contour shape unanimity, vertical support skeleton's both ends respectively with the last profile and the lower profile connection of outer contour skeleton, adjacent two of cross-section skeleton the outer contour skeleton passes through the longitudinal connector and connects.

2. The internal framework of the box girder type bridge segment model for the high wind speed test of claim 1, wherein the cross-section framework further comprises a transverse supporting framework, and two ends of the transverse supporting framework are respectively connected with the junction points of two ends of the upper profile of the outer profile framework and two ends of the lower profile of the outer profile framework.

3. The internal framework of the box girder type bridge section model for the high wind speed test according to claim 2, wherein the section framework is formed by welding angle steel.

4. The internal framework of the box girder type bridge section model for the high wind speed test of claim 2, wherein the longitudinal connecting piece comprises an upper connecting angle steel and a lower connecting angle steel, the upper connecting angle steel is respectively connected with the upper profile of the outer profile framework and the upper end of the vertical supporting framework, and the lower connecting angle steel is respectively connected with the lower profile of the outer profile framework and the lower end of the vertical supporting framework.

5. The internal framework of the box girder type bridge section model for the high wind speed test according to claim 4, further comprising a long angle connector sequentially connected to the section framework at the tail end from the section framework at the head end, wherein two angle steel planes of the long angle connector are respectively connected with the vertical support framework and the horizontal support framework.

6. The box girder type bridge section model internal framework for the high wind speed test according to claim 5, further comprising a railing base, wherein the railing base is sequentially connected to the cross section framework at the tail end from the cross section framework at the head end along the bridge length direction, and the railing base is positioned on the top surface of the upper contour of the outer contour framework.

7. The internal framework of the box girder type bridge section model for the high wind speed test according to claim 1, wherein the model support arms for connecting with a wind tunnel experiment device are arranged on the section frameworks at the head end and the tail end.

8. The internal framework of a box girder type bridge segment model for high wind speed test as claimed in claim 7, wherein the model supporting arms comprise supporting steel pipes.