CN112627014A

CN112627014A - Stiffening longitudinal beam structure for enhancing robustness of suspended bridge system of through arch bridge and construction method thereof

Info

Publication number: CN112627014A
Application number: CN202110079159.7A
Authority: CN
Inventors: 吴庆雄; 陈康明; 袁辉辉; 杨益伦
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-04-09
Anticipated expiration: 2041-01-21
Also published as: CN112627014B; LU502336B1; WO2022156109A1

Abstract

The invention belongs to the technical field of bridge engineering, and particularly relates to a stiffening longitudinal beam structure for enhancing the robustness of a suspended bridge system of a through arch bridge and a construction method thereof. The stiffening longitudinal beam structure is arranged between the two cross beams in a mode of sleeving the large pipe unit and the small pipe unit with each other, inserting the supporting pipe unit and installing the anchoring steel plate unit. The invention has the advantages of light weight, large rigidity and easy connection of the steel structure stiffening longitudinal beam, greatly improves the integral rigidity and stability of the suspension bridge system, can fully release the inconsistent deformation of the bridge deck and the stiffening longitudinal beam caused by temperature change, can bear the impact force generated by the fracture of the suspender in a certain length, enhances the robustness of the suspension bridge system, can effectively avoid major accidents, and has good economic value and social effect.

Description

Stiffening longitudinal beam structure for enhancing robustness of suspended bridge system of through arch bridge and construction method thereof

Technical Field

The invention belongs to the technical field of bridge engineering, and particularly relates to a stiffening longitudinal beam structure for enhancing the robustness of a suspended bridge system of a through arch bridge and a construction method thereof.

Background

At present, the design of the suspended bridge way system of the half-through arch bridge in China is mainly not the stress of stiffening longitudinal beams, but mainly the stress of cross beams, suspender rods are also anchored at two ends of the cross beams, then bridge decks are laid on the cross beams, and most of the cross beams are not provided with stiffening longitudinal beams. After the built half-through arch bridge is operated and used for years, the suspension bridge way system of the built half-through arch bridge has more diseases, such as overlarge bridge deck vibration, serious bridge deck damage, support drop and the like, and serious accidents of bridge deck collapse and even whole bridge collapse caused by accidental breakage of the suspension rod have occurred in succession in recent years, so irrecoverable economic loss is caused.

Since the boom breakage and beam falling accidents occur in the small south bridge in yibin, peacock river, libin, and the like in Xinjiang, many scholars have conducted intensive research on the problem of how to improve the safety coefficient of the suspension bridge system, and most of the research focuses on the safety performance of the boom, and the improvement of the boom arrangement form is proposed to ensure the safe operation of the boom. However, due to the lack of sufficient rigidity of the suspension bridge system, the construction problem of the suspension rod, the serious overload phenomenon and the like, the suspension rod in the suspension bridge system still has serious safety hazards, such as deformation and corrosion of the anchor head, cracking of the sheath, corrosion of the cable body, stress corrosion and the like, so that the possibility of sudden breakage of the suspension rod still exists.

Therefore, it is necessary to design a stiffening longitudinal beam structure for enhancing the robustness of the suspended bridge system of the half-through arch bridge and a construction method thereof, wherein the stiffening longitudinal beam structure has light self weight, reasonable structural stress, convenient construction, excellent durability and strong economic and practical applicability, can effectively solve the problems of insufficient overall rigidity and poor stability of the suspended bridge system of the half-through arch bridge, can bear the impact force generated by the fracture of a suspender in a certain length, and can enhance the robustness of the suspended bridge system.

The patent publication number is CN111945541A, Chinese invention patent with publication number 2020.11.17 discloses a through tied arch bridge, which comprises pier columns, a support, a first steel box main arch rib, a second steel box main arch rib, a first steel box auxiliary arch rib, a second steel box auxiliary arch rib, an arch beam connector, a balance arch, a main beam, a main arch, an arch rib connector and a transverse connector, wherein the pier columns are symmetrically provided with two main arches, the main arches are symmetrically arranged on the pier columns, one end of the first steel box main arch rib is connected with one of the main arches on one of the pier columns, the other end of the first steel box main arch rib is connected with the corresponding main arch on the other pier column, the two ends of the first steel box auxiliary arch rib are correspondingly arranged at the two ends of the first steel box main arch rib, the first steel box auxiliary arch rib is connected with the first steel box main arch rib through the arch rib connector, and the second steel box main rib is connected with the corresponding main arch on one of the pier columns.

However, the through tied arch bridge in the patent has the problems of unreasonable structural stress and poor overall durability.

Disclosure of Invention

The invention aims to provide a stiffening longitudinal beam structure for enhancing the robustness of a suspended bridge system of a half-through arch bridge and a construction method thereof, which can realize the effect of installing the stiffening longitudinal beam structure between two cross beams by sleeving a large pipe unit and a small pipe unit with each other, inserting a supporting pipe unit and installing an anchoring steel plate unit. The invention has the advantages of light weight, large rigidity and easy connection of the steel structure stiffening longitudinal beam, greatly improves the integral rigidity and stability of the suspension bridge system, can fully release the inconsistent deformation of the bridge deck and the stiffening longitudinal beam caused by temperature change, can bear the impact force generated by the fracture of the suspender in a certain length, enhances the robustness of the suspension bridge system, can effectively avoid major accidents, and has good economic value and social effect.

The technical scheme adopted by the invention for solving the problems is as follows: a stiffening longitudinal beam structure for enhancing the robustness of a suspended bridge system of a half-through arch bridge comprises a large pipe unit, a small pipe unit and two anchoring steel plate units, wherein the large pipe unit and the small pipe unit are sleeved with each other, and the two anchoring steel plate units are respectively arranged on the outer side ends of the large pipe unit and the small pipe unit and are used for connecting a cross beam.

The further preferred technical scheme is as follows: the large pipe unit comprises a large pipe main body and a baffle plate which is arranged at one end of the large pipe main body and is used for being attached to the small pipe unit; the small pipe unit comprises a small pipe main body and an anti-falling steel plate, wherein one end of the small pipe main body is inserted into the large pipe main body, the outer ring surface of the small pipe main body is attached to the baffle, and the anti-falling steel plate is arranged at the insertion end of the small pipe main body and is attached to the inner ring surface of the large pipe main body.

The further preferred technical scheme is as follows: the large pipe unit also comprises outer ring directional stiffening plates arranged on the outer side of the baffle and the outer ring surface of the large pipe main body, and outer longitudinal stiffening plates arranged among the outer ring directional stiffening plates; the small pipe unit also comprises inner ring-shaped stiffening plates arranged on the inner ring surface of the small pipe main body and inner longitudinal stiffening plates arranged among the inner ring-shaped stiffening plates and between the inner ring-shaped stiffening plates and the anti-falling steel plates.

The further preferred technical scheme is as follows: and the inner ring surface of the large pipe main body and the outer ring surface of the small pipe main body are provided with coatings for friction during insertion.

The further preferred technical scheme is as follows: and a supporting pipe unit is further arranged on the inner side of the large pipe main body and the outer side of the small pipe main body and between the baffle plate and the anti-falling steel plate.

The further preferred technical scheme is as follows: the support tube unit comprises an elastic ring sleeved between the large tube main body and the small tube main body, two support tube main bodies arranged on two sides of the elastic ring respectively, and compression springs arranged on the opposite outer sides of the two support tube main bodies and used for jacking the support tube main bodies on the baffle plate and jacking the support tube main bodies on the anti-falling steel plate respectively.

The further preferred technical scheme is as follows: the thickness of the support tube main body is 90-95% of the distance between the inner ring surface of the large tube main body and the outer ring surface of the small tube main body, and the length of the support tube main body is 35-48% of the splicing length of the large tube main body and the small tube main body.

The further preferred technical scheme is as follows: the insertion length of the large pipe body and the small pipe body is more than 2 times of the outer diameter of the large pipe body.

The further preferred technical scheme is as follows: the anchoring steel plate unit comprises an anchoring steel plate main body arranged at the end, far away from the large pipe main body or the small pipe main body relatively, a stiffening steel plate arranged on the anchoring steel plate main body and used for connecting the outer ring surface of the large pipe main body or the small pipe main body, and a screw hole arranged on the anchoring steel plate main body and used for inserting a cross beam threaded steel bar or a cross beam screw rod.

A construction method of a stiffening longitudinal beam structure for enhancing the robustness of a suspended bridge system of a half-through arch bridge sequentially comprises the following steps:

s1, welding the small pipe main body, the anti-falling steel plate, the inner ring directional stiffening plate and the inner longitudinal stiffening plate into a whole, and coating the coating on the inner ring surface of the small pipe main body to obtain the small pipe unit;

s2, coating the coating on the inner ring surface of the large pipe main body, and then sequentially inserting the small pipe units and the support pipe units to obtain a stiffening longitudinal beam structure matrix;

s3, welding the baffle, the outer annular stiffening plate and the outer longitudinal stiffening plate on the large pipe main body to obtain a stiffening longitudinal beam structure main body;

s4, welding the anchoring steel plate units at the two ends of the small pipe body and the large pipe body respectively to obtain the final stiffening longitudinal beam structure,

and S5, connecting and installing the stiffening longitudinal beam structure and the cross beam in a bolt welding combination mode to finish the whole construction operation.

The stiffening longitudinal beam structure is arranged between the two cross beams in a mode of sleeving the large pipe unit and the small pipe unit with each other, inserting the supporting pipe unit and installing the anchoring steel plate unit. The invention has the advantages of light weight, large rigidity and easy connection of the steel structure stiffening longitudinal beam, greatly improves the integral rigidity and stability of the suspension bridge system, can fully release the inconsistent deformation of the bridge deck and the stiffening longitudinal beam caused by temperature change, can bear the impact force generated by the fracture of the suspender in a certain length, enhances the robustness of the suspension bridge system, can effectively avoid major accidents, and has good economic value and social effect.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the sleeving position of the large pipe unit and the small pipe unit in the invention.

Fig. 3 is a schematic view illustrating a position structure of the anchoring steel plate unit according to the present invention.

FIG. 4 is a schematic view of the use of the stiffening stringer structure of the present invention.

Detailed Description

The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Example (b): as shown in fig. 1, 2, 3 and 4, a stiffening girder structure for enhancing the robustness of a suspended bridge system of a half-through arch bridge comprises a large pipe unit 1, a small pipe unit 2 and two anchoring steel plate units 3 which are respectively arranged on the outer side ends of the large pipe unit 1 and the small pipe unit 2 and are used for connecting a cross beam 11.

In this embodiment, the cross beams 11 are provided with suspension rods 13 at two ends for supporting the bridge deck 12 in a prior art manner, and the stiffening longitudinal beam structure is disposed between two cross beams 11 for ensuring greater robustness of the whole suspension bridge system, and has the advantages of high rigidity and high stability.

Wherein the large pipe unit 1 and the small pipe unit 2 are sleeved with each other and are the main body of the stiffening girder structure, so that the stiffening girder structure: first, having sufficient longitudinal strength; secondly, the proper longitudinal deformation is allowed, the bending rigidity of the bridge system is finally increased, the impact force generated by the fracture of the hanger rods 13 can be borne in a certain length, the robustness of the suspended bridge system is enhanced, and the anchoring steel plate unit 3 is an installation part between the stiffening longitudinal beam structure and the cross beam 11, so that the two ends of the stiffening longitudinal beam structure are stably installed and are not easy to fall off.

The large pipe unit 1 comprises a large pipe main body 101 and a baffle plate 102 which is arranged at one end of the large pipe main body 101 and is used for being attached to the small pipe unit 2; the small tube unit 2 includes a small tube main body 201 having one end inserted into the large tube main body 101 and an outer circumferential surface attached to the baffle plate 102, and a drop-off preventing steel plate 202 provided at the inserted end of the small tube main body 201 and attached to an inner circumferential surface of the large tube main body 101.

In this embodiment, the anti-falling steel plate 202 is welded to the large pipe body 101 in advance, inserted into the large pipe body 101, and finally the baffle plate 102 is welded and fixed to the large pipe body 101, so as to form an integral structure with a large inside and a small outside, thereby achieving the anti-falling effect.

The baffle plate 102 may be a whole circular ring or an arc block having inner and outer arc surfaces, so as to prevent the whole of the small pipe main body 201 and the anti-drop steel plate 202 from dropping from the large pipe main body 101.

In addition, the large pipe body 101 and the small pipe body 201 may be circular steel pipes, square steel pipes, or triangular steel pipes.

The large pipe unit 1 further comprises outer ring directional stiffening plates 103 arranged on the outer side of the baffle plate 102 and the outer ring surface of the large pipe main body 101, and outer longitudinal stiffening plates 104 arranged among the outer ring directional stiffening plates 103; the small tubelet unit 2 further comprises inner ring stiffener plates 203 arranged on the inner ring surface of the small tubelet body 201, and inner longitudinal stiffener plates 204 arranged between the inner ring stiffener plates 203 and the anti-drop steel plates 202.

In this embodiment, the structures formed by the outer circumferential stiffener 103, the outer longitudinal stiffener 104, the inner circumferential stiffener 203, and the inner longitudinal stiffener 204 are all the same, and are all for improving the circumferential structural strength and the longitudinal structural strength of the pipe orifices of the large pipe main body 101 and the small pipe main body 201, so that when the sleeving position is stressed and bends downwards, the positions of the two pipe orifices are not easily deformed, and the overall structural rigidity of the stiffening longitudinal beam structure is ensured.

And the inner ring surface of the large pipe body 101 and the outer ring surface of the small pipe body 201 are provided with coatings 4 for friction during insertion.

In this embodiment, the material of coating 4 is current rust-resistant, wear-resisting, lubricated coating, ensures that steel construction stiffening longeron is vertical freely flexible under the influence of temperature variation.

A support tube unit 5 is further arranged between the baffle plate 102 and the anti-falling steel plate 202 on the inner side of the large tube main body 101 and the outer side of the small tube main body 201. The support tube unit 5 includes an elastic ring 501 fitted between the large tube main body 101 and the small tube main body 201, two support tube main bodies 502 respectively provided on both sides of the elastic ring 501, and compression springs 503 provided on opposite outer sides of the two support tube main bodies 502 and respectively for jacking up the support tube main bodies 502 on the baffle plate 102 and the support tube main bodies 502 on the drop-off preventing steel plate 202. The thickness of the support tube main body 502 is 90-95% of the distance between the inner ring surface of the large tube main body 101 and the outer ring surface of the small tube main body 201, and the length of the support tube main body 502 is 35-48% of the insertion length of the large tube main body 101 and the small tube main body 201.

In this embodiment, the stiffening longitudinal beam structure has two deformation conditions, the first deformation condition is that the stiffening longitudinal beam structure is integrally stretched along with the change of temperature, and the second deformation condition is that the stiffening longitudinal beam structure is bent and deformed downwards due to pressure, and the section of the hollow section between the baffle plate 102 and the anti-falling steel plate 202 is insufficient in strength when the section of the hollow section is deformed, so that the support tube unit 5 is introduced to ensure that the splicing structure of the large tube main body 101 and the small tube main body 201 can have a sufficient downward bending deformation allowable range and can not be bent and broken.

The elastic ring 501 is made of existing high-strength engineering plastic, and the compression spring 503 is an existing high-strength steel spring.

The insertion length of the large pipe body 101 and the small pipe body 201 is more than 2 times of the outer diameter of the large pipe body 101.

In this embodiment, the plugging length is sufficient and appropriate, and the stability and sufficient bending margin of the plugging structure can be ensured by matching with the anti-drop steel plate 202 with an appropriate size.

The anchoring steel plate unit 3 includes an anchoring steel plate body 301 disposed on a relatively distant end of the large pipe body 101 or the small pipe body 201, a stiffening steel plate 302 disposed on the anchoring steel plate body 301 for connecting an outer circumferential surface of the large pipe body 101 or the small pipe body 201, and a screw hole 303 disposed on the anchoring steel plate body 301 for inserting a beam rebar or a beam screw.

In this embodiment, the beam twisted steel may be fixed to the beam 11 made of concrete, or may be inserted into a preformed hole of the beam 11, and finally, a fastening nut is fitted to ensure that the anchoring steel plate main body 301 is fixed to the beam 11 with high strength.

s1, welding the small tube main body 201, the anti-falling steel plate 202, the inner ring radial stiffening plate 203 and the inner longitudinal stiffening plate 204 into a whole, and coating the coating 4 on the inner ring surface of the small tube main body 201 to obtain the small tube unit 2;

s2, coating the coating 4 on the inner annular surface of the large pipe main body 101, and then sequentially inserting the small pipe unit 2 and the support pipe unit 5 to obtain a stiffening longitudinal beam structure matrix;

s3, welding the baffle plate 102, the outer annular stiffening plate 103 and the outer longitudinal stiffening plate 104 on the large pipe main body 101 to obtain a stiffening longitudinal beam structure main body;

s4, respectively welding the anchoring steel plate units 3 at the two ends of the small pipe body 201 and the large pipe body 101 to obtain the final stiffening girder structure,

and S5, connecting and installing the stiffening longitudinal beam structure and the cross beam 11 in a bolt welding combination mode to finish the whole construction operation.

In this embodiment, the construction method of the stiffening longitudinal beam structure is performed in the manner of the prior art, so as to ensure that the stiffening longitudinal beam structure is finally obtained.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications, which are intended to be protected by patent laws within the scope of the claims appended hereto.

Claims

1. A stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-support arch bridge, characterized in that it comprises a large pipe unit (1), a small pipe unit (2) that are sleeved with each other, and a Two anchoring steel plate units (3) on the outer ends of the tube unit (1) and the small tube unit (2) and used for connecting the beam (11).

2. The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-support arch bridge according to claim 1, wherein the large pipe unit (1) comprises a large pipe main body (101), and is provided with A baffle plate (102) at one end of the large pipe body (101) and used to fit the small pipe unit (2); the small pipe unit (2) includes one end inserted into the large pipe body (101) and an outer annular surface A small tube body (201) fitted with the baffle plate (102), and an anti-shedding steel plate (202) disposed on the insertion end of the small tube body (201) and fitted to the inner annular surface of the large tube body (101) ).

3 . The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-support arch bridge according to claim 2 , wherein the large pipe unit ( 1 ) further comprises a baffle plate ( 102 ). ) on the outer side, the outer annular stiffening plate (103) on the outer annular surface of the large pipe body (101), and the outer longitudinal stiffening plate (104) arranged between a plurality of the outer annular stiffening plates (103) The small tube unit (2) further comprises an inner annular stiffening plate (203) arranged on the inner annular surface of the small tube main body (201), and is arranged between a plurality of the inner annular stiffening plates (203) and an inner longitudinal stiffening plate (204) between the inner annular stiffening plate (203) and the anti-falling-off steel plate (202).

4. A stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-support arch bridge according to claim 2, characterized in that: the inner ring surface of the large pipe main body (101) and the outer ring surface of the small pipe main body (201) The annular surface is provided with a coating (4) for friction during mating.

5. The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-support arch bridge according to claim 2, characterized in that: the inner side of the large pipe main body (101) and the outer side of the small pipe main body (201) A support pipe unit (5) is also provided between the baffle plate (102) and the anti-falling-off steel plate (202).

6. The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-supported arch bridge according to claim 5, characterized in that: the support pipe unit (5) comprises a main body (101) sleeved on the large pipe ) and the small tube body (201) between the elastic ring (501), the two support tube bodies (502) respectively arranged on both sides of the elastic ring (501), and the two support tube bodies ( 502 ) are respectively used to push up the support pipe body ( 502 ) on the baffle plate ( 102 ) and the support pipe body ( 502 ) on the anti-fall-off steel plate ( 202 ) The compression spring (503).

7 . The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-supported arch bridge according to claim 6 , wherein the thickness of the support pipe body ( 502 ) is equal to the thickness of the large pipe body ( 101 ). 8 . ) 90-95% of the distance between the inner ring surface and the outer ring surface of the small tube body (201), the length of the support tube body (502) is the length of the large tube body (101) and the small tube body (201) ) 35-48% of the plug length.

8. The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-supported arch bridge according to claim 2, characterized in that: the insertion of the large pipe main body (101) and the small pipe main body (201) The connecting length is greater than twice the outer diameter of the large pipe body (101).

9 . The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-support arch bridge according to claim 2 , wherein the anchoring steel plate unit ( 3 ) comprises a main body ( 101 ) disposed on the large pipe ( 101 ). ) or the anchoring steel plate body (301) on the relatively distant end of the small tube body (201), which is arranged on the anchoring steel plate body (301) and is used to connect the large tube body (101) or the small tube body (201) ) a stiffening steel plate (302) on the outer annular surface, and a screw hole (303) provided on the anchoring steel plate main body (301) and used for inserting beam threaded bars or beam screws.

10. A construction method of a stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge track system of a mid-support arch bridge, is characterized in that comprising the following steps in turn:

S1. Weld the small tube body (201), the anti-shedding steel plate (202), the inner circumferential stiffening plate (203) and the inner longitudinal stiffening plate (204) into a whole, and place the inner annular surface of the small tube body (201) on the Applying the coating (4) to obtain the small tube unit (2);

S2. First coat the coating (4) on the inner annular surface of the large pipe body (101), and then insert the small pipe unit (2) and the support pipe unit (5) in sequence to obtain a stiffened longitudinal beam structure matrix;

S3. Welding the baffle plate (102), the outer circumferential stiffening plate (103) and the outer longitudinal stiffening plate (104) on the large pipe body (101) to obtain a stiffened longitudinal beam structure body;

S4. Weld the anchoring steel plate units (3) at both ends of the small tube main body (201) and the large tube main body (101) respectively to obtain the final stiffened longitudinal beam structure,

S5. Connect and install the stiffened longitudinal beam structure and the transverse beam (11) by means of bolt-welding combination to complete the entire construction operation.