CN218263526U

CN218263526U - Continuous beam bridge reinforced structure

Info

Publication number: CN218263526U
Application number: CN202222799631.7U
Authority: CN
Inventors: 程寿山; 樊平; 杜骁
Original assignee: Research Institute of Highway Ministry of Transport
Current assignee: Research Institute of Highway Ministry of Transport
Priority date: 2022-10-24
Filing date: 2022-10-24
Publication date: 2023-01-10
Anticipated expiration: 2032-10-24

Abstract

The utility model relates to a continuous beam bridge reinforcing structure, which comprises a left frame body, a beam and a right frame body; the left frame body and the right frame body are symmetrically arranged on the left side and the right side of a main beam top plate of the continuous beam bridge and are connected through a plurality of cross beams, so that the reinforced structure is of a truss structure, and the overall rigidity of the beam bridge is improved; the structure of left and right support body is the same, and left support body includes in long limit web member in left side, left side minor face web member, the upper chord member in left side, web member in No. one in left side, web member in No. two in the left side, web member in No. three in the left side, web member in No. four in the left side, web member in No. five in the left side and web member in No. six in the left side. The highest point of the reinforced structure is directly connected to the center point of the pier support through the left middle web member III and the right middle web member III, the beam height of the pier supporting point is increased, the bending rigidity of the beam bridge is increased, the negative bending moment borne by the supporting point of the beam bridge is increased, the cross-section positive bending moment can be reduced under the same load, and therefore the cross-section internal force of the main beam in the span is reduced.

Description

Continuous beam bridge reinforced structure

Technical Field

The utility model belongs to the technical field of continuous beam bridge consolidates, specifically a continuous beam bridge reinforced structure can improve the bearing capacity of beam bridge.

Background

The concrete continuous beam bridge is one of the most widely used forms in the medium and small span beam bridges in China. The continuous beam bridge is formed by longitudinally connecting a plurality of simply supported beams into a whole, so that a statically indeterminate structure is formed, and the continuous beam bridge has the advantages of high structural rigidity, few bridge pier joints, excellent driving conditions and the like.

The existing in-service concrete continuous beam bridge is influenced by factors such as operating environment, overload, material degradation and untimely maintenance, so that the bearing capacity of a main beam is reduced, even a beam body is cracked, and cracks are easily generated particularly at the positions of a bottom plate, a top plate and the like at the midspan and the pivot. Therefore, in case of the continuous beam bridge having cracks due to insufficient load-bearing capacity, a proper reinforcing method is required. At present, common reinforcing methods comprise a bonded steel plate or carbon fiber cloth, outer-wrapped concrete and the like, the bonded steel plate can increase the rigidity of a crack, construction is generally carried out at the bottom of a beam, the operation space is limited, outcrossing is often needed, and traveling is seriously affected; the durability and the ductility of the structure can be improved by sticking the carbon fiber cloth, but the structural rigidity can not be improved, and the contribution to the improvement of the bearing capacity of the beam bridge is small; the outer concrete can improve the bearing capacity of the structure and obviously increase the permanent load of the structure.

Therefore, the application provides a novel reinforced structure of continuous beam bridge that can enough slow down crack propagation, can improve beam bridge bearing capacity simultaneously again.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model aims to solve the technical problem that a continuous beam bridge reinforced structure is provided. The connection points of the reinforced structure and the girder top plate are all located at the middle pivot of the continuous girder bridge, the internal force of the cross section of the girder span is indirectly and effectively reduced in a mode of lifting the rigidity of the girder near the middle pivot, the problem that the cross sections of the fulcrum top plate and the span middle bottom plate crack is solved, and the bearing capacity of the girder bridge is effectively improved.

In order to achieve the above purpose, the utility model adopts the following technical proposal:

a continuous beam bridge reinforcing structure comprises a left frame body, cross beams and a right frame body, wherein the left frame body and the right frame body are symmetrically arranged on the left side and the right side of a main beam top plate of a continuous beam bridge, and the left frame body and the right frame body are connected through the cross beams, so that the reinforcing structure is in a truss structure;

the left frame body and the right frame body have the same structure, wherein the left frame body comprises a left long-side web member, a left short-side web member, a left upper chord member, a left first middle web member, a left second middle web member, a left third middle web member, a left fourth middle web member, a left fifth middle web member and a left sixth middle web member;

the lower end of the left long-side web member is fixedly connected with the main beam top plate, the upper end of the left long-side web member is connected with the upper end of the left upper chord member, the upper end of the left middle web member III and one end of the crossbeam III, the lower end of the left upper chord member is connected with the upper end of the left short-side web member, the upper end of the left middle web member VI and one end of the crossbeam I, and the lower end of the left short-side web member is fixedly connected with the main beam top plate; the lower end of the left third middle web member is connected with the lower end of the left second middle web member, the lower end of the left fourth middle web member and the main beam top plate, the left third middle web member is perpendicular to the main beam top plate, and the length of the left third middle web member is equal to the distance between the lower end connecting point of the left third middle web member and the lower end connecting point of the left long-side web member; the upper end of the left second middle web member, the upper end of the left first middle web member and one end of the fourth cross beam are all connected with the middle point of the left long-side web member, the lower end of the left first middle web member is fixedly connected with the main beam top plate, and the left first middle web member is parallel to the left third middle web member; the upper end of the left middle web member No. four, the upper end of the left middle web member No. five and one end of the second cross beam are all fixedly connected with the middle point of the left upper chord member, the lower end of the left middle web member No. five and the lower end of the left middle web member No. six are fixedly connected with the main beam top plate, and the lower end connecting point of the left middle web member No. five is located at the middle point between the lower end connecting point of the left short side web member and the lower end connecting point of the left middle web member No. three.

Furthermore, the left third middle web member and the right third middle web member divide the span of the reinforcing structure into a mid-span and a side-span, the mid-span of the reinforced structure is 1/4-1/3 of the mid-span of the girder bridge, and the side-span of the reinforced structure is 1/5-1/4 of the side-span of the girder bridge.

Furthermore, the length of the left short-side web member is 8/25-10/25 of the distance between the lower end connecting point of the left short-side web member and the lower end connecting point of the left middle web member III, and the included angle between the left short-side web member and the main beam top plate is 55-65 degrees.

Compared with the prior art, the utility model has the advantages of it is following:

1. the left frame body and the right frame body are connected through the plurality of cross beams, so that the reinforced structure is of a steel truss structure, the reinforced structure and the main beam of the continuous beam bridge are connected into a whole, and the integral rigidity of the beam bridge is improved; the steel truss structure adopts the modularized assembly setting and the upper part of the main beam, and the components can be prefabricated and are connected through bolts, so that the steel truss structure has the advantages of simplicity and rapidness in construction, convenience in field installation, controllable reinforcing effect and the like.

2. The utility model discloses in, web member and web member lug connection in No. three on right side in the web member lug connection in pier support central point department in the highest point of reinforced structure passes through No. three on left side, has increased the roof beam height of pier fulcrum department, makes the increase of beam bridge bending rigidity, and the fulcrum department bears the hogging moment increase in the beam bridge, can make under the same load to stride the cross-section positive moment and reduce to reduce the girder and stride the cross-section internal force in. The horizontal distance between the gravity center position of the reinforced structure and the third middle web member is about 6-9% of the overall span of the reinforced structure, the dead weight of the reinforced structure is basically and completely borne by the bridge piers, redundant external load is not generated on the midspan section of the girder, and the bearing capacity of the girder bridge is improved.

3. The utility model discloses a reinforced structure utilizes the atress characteristic of continuous beam bridge self, has improved the roof beam height of fulcrum department in the girder to reduce the positive bending moment in the bridge span, and the structure of integral type has promoted the ability that negative bending moment was resisted to fulcrum department girder. The connection points of the reinforced structure and the girder top plate are all located at the middle pivot of the girder bridge, so that the internal force distribution of each section of the girder can be effectively improved, the internal force at the cracking section of the girder bridge is improved, crack expansion is avoided, and the bearing capacity and the bending and shearing resistance at the pivot of the girder bridge are improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention at a viewing angle;

FIG. 2 is a schematic view of the overall structure of the present invention at another viewing angle

FIG. 3 is a schematic structural view of a right short-side web member of the present invention;

fig. 4 is a schematic structural view of a right-side first middle web rod of the present invention;

fig. 5 is a schematic structural view of a right-side No. three middle web member of the present invention;

illustration of the drawings: 1. a right long-side web member; 2. a left long-side web member; 3. a right short-side web member; 4. a left short-side web member; 5. a first cross beam; 6. a second beam; 7. a third beam; 8. a fourth beam; 9. a right upper chord; 10. a left side upper chord; 11. right side No. one middle web pole; 12. the right side is a second middle web member; 13. the right side is a third middle web member; 14. a right middle web member; 15. the right side five middle web rods; 16. the right side of the middle web pole is six; 17. left side middle web rod; 18. the left middle web rod II; 19. left middle web pole; 20. the left side is the middle web pole No. four; 21. the left side is the fifth middle web pole; 22. left side No. six middle web pole.

Detailed Description

The technical solutions of the present invention will be further described in detail with reference to the drawings and the embodiments, but the scope of the present invention is not limited thereto.

The utility model provides a continuous beam bridge reinforced structure (for short reinforced structure, see fig. 1 ~ 5), this reinforced structure include left support body, crossbeam and right support body, and left support body and right support body symmetry are installed in the left and right both sides of the girder roof of continuous beam bridge, and left support body and right support body connect through many crossbeams for this reinforced structure is truss structure, has improved reinforced structure's bulk rigidity.

The left frame body comprises a left long-side web member 2, a left short-side web member 4, a left upper chord member 10, a left first middle web member 17, a left second middle web member 18, a left third middle web member 19, a left fourth middle web member 20, a left fifth middle web member 21 and a left sixth middle web member 22;

the lower end of the left long-side web member 2 is fixedly connected with a main beam top plate of the continuous beam bridge through a high-strength bolt, the upper end of the left long-side web member 2 is connected with the upper end of a left upper chord member 10, the upper end of a left third middle web member 19 and one end of a third cross beam 7 through a high-strength bolt, the lower end of the left upper chord member 10 is connected with the upper end of a left short-side web member 4, the upper end of a left six middle web member 22 and one end of a first cross beam 5 through a high-strength bolt, and the lower end of the left short-side web member 4 is fixedly connected with the main beam top plate through a high-strength bolt; the lower end of a left third middle web rod 19 is connected with the lower end of a left second middle web rod 18, the lower end of a left fourth middle web rod 20 and a main beam top plate of the continuous beam bridge through high-strength bolts, the left third middle web rod 19 is perpendicular to the main beam top plate, and the rod length of the left third middle web rod 19 is equal to the distance between the lower end connecting point of the left third middle web rod 19 and the lower end connecting point of the left long-side web rod 2; the upper end of a second left middle web rod 18, the upper end of a first left middle web rod 17 and one end of a fourth cross beam 8 are connected with the middle point of the long side web rod 2 through high-strength bolts, the lower end of the first left middle web rod 17 is fixedly connected with a main beam top plate through the high-strength cross beam, and the first left middle web rod 17 is parallel to a third left middle web rod 19; the upper end of the left fourth middle web member 20, the upper end of the left fifth middle web member 21 and one end of the second cross beam 6 are fixedly connected with the middle point of the left upper chord 10 through high-strength bolts, the lower end of the left fifth middle web member 21 and the lower end of the left sixth middle web member 22 are fixedly connected with the girder top plate through high-strength bolts, and the lower end connection point of the left fifth middle web member 21 is located at the middle point between the lower end connection point of the left short-side web member 4 and the lower end connection point of the left third middle web member 19.

The structure of the right frame body is the same as that of the left frame body, and the right frame body comprises a right long-side web member 1, a right short-side web member 3, a right upper chord 9, a right first middle web member 11, a right second middle web member 12, a right third middle web member 13, a right fourth middle web member 14, a right fifth middle web member 15 and a right sixth middle web member 16;

the lower end of the right long-side web member 1 is fixedly connected with a main beam top plate through a high-strength bolt, the upper end of the right long-side web member 1 is fixedly connected with the upper end of a right upper chord member 9, the upper end of a right third middle web member 13 and the other end of a third cross beam 7 through a high-strength bolt, the lower end of the right upper chord member 9 is fixedly connected with the upper end of a right short-side web member 3, the upper end of a right sixth middle web member 16 and the other end of a first cross beam 5 through a high-strength bolt, and the lower end of the right short-side web member 3 is fixedly connected with the main beam top plate through a high-strength bolt; the lower end of a right third middle web member 13 is connected with the lower end of a right second middle web member 12, the lower end of a right fourth middle web member 14 and a main beam top plate of the continuous beam bridge through high-strength bolts, the right third middle web member 13 is perpendicular to the main beam top plate, and the length of the right third middle web member 13 is equal to the distance between the lower end connecting point of the right long-side web member 1 and the lower end connecting point of the right third middle web member 13; the upper end of a right second middle web rod 12, the upper end of a right first middle web rod 11 and the other end of a fourth cross beam 8 are connected with the middle point of a right upper side web rod 1 through high-strength bolts, the lower end of the right first middle web rod 11 is fixedly connected with a main beam top plate through high-strength bolts, and the right first middle web rod 11 is parallel to a right third middle web rod 13; the upper end of a right fourth middle web member 14, the upper end of a right fifth middle web member 15 and the other end of a second cross beam 6 are connected with the middle point of the right upper chord 9 through high-strength bolts, the lower end of the right fifth middle web member 15 and the lower end of a right sixth middle web member 16 are fixedly connected with the girder top plate through high-strength bolts, and the lower end connecting point of the right fifth middle web member 15 is located at the middle point between the lower end connecting point of the right short-side web member 3 and the lower end connecting point of the right third middle web member 13.

The third middle web rod 19 on the left side and the third middle web rod 13 on the right side of the reinforced structure improve the height of a main beam at a fulcrum in a girder bridge, the height of the main beam is the distance between a beam bottom and the highest position of the beam, before the reinforced structure is not arranged, the highest position of the beam is a main beam top plate, after the reinforced structure is added, the position where the reinforced structure is connected with a continuous girder bridge is positioned on the main beam top plate, the connection among all the components in the reinforced structure is rigid connection, sliding and rotation do not exist, the reinforced structure is symmetrically distributed along the central line of the girder bridge, when the girder bridge is seen transversely, the third middle web rod 13 on the right side, the third middle web rod 19 on the left side and a pier are positioned on the same straight line, so that the third middle web rod 13 on the right side and the third middle web rod 19 on the left side become a part of the main beam, the highest position of the main beam is changed into the top ends of the third middle web rod 13 on the right side and the third middle web rod 19 on the left side from the main beam top plate, thereby improving the height of the main beam, further reducing the positive moment in the bridge, improving the load bearing capability of the bridge, and improving the capability of the three middle web rods on the bridge, and improving the load bearing capability of the whole load bearing capability of the bridge at the bridge, and the position of the bridge, and the three middle web rods 13, so that the load bearing capability of the bridge is about the bridge at the position of the vertical load bearing capability of the bridge, and the bridge is increased by the bridge, and the three bridge, and the load bearing capability of the bridge, and the bridge is about 6% of the bridge, and the load bearing capability of the bridge, and the load bearing capability of the bridge at the position of the bridge is increased; the left support body and the right support body on the two sides of the bridge deck are connected through the cross beams, the integrity of the reinforced structure is improved, and the reinforcing effect can be better played.

The span of the reinforced structure is divided into a midspan span and a side span by the left third middle web rod 19 and the right third middle web rod 13, wherein the midspan span of the reinforced structure is 1/4-1/3 of the midspan span of the girder bridge, namely the distance between the connecting point of the lower end of the left short-side web rod 4 and the connecting point of the lower end of the left third middle web rod 19 is 1/4-1/3 of the midspan span of the girder bridge; the side span of the reinforced structure is 1/5-1/4 of that of the bridge, namely, the distance between the lower end connecting point of the left third middle web member 19 and the lower end connecting point of the left long side web member 2 is 1/5-1/4 of the bridge side span. The length of the left short-side web member 4 is 8/25-10/25 of the distance between the lower end connecting point of the left short-side web member 4 and the lower end connecting point of the left middle web member 19, and the included angle between the left short-side web member 4 and the main beam top plate is 55-65 degrees.

The surface of the high-strength bolt is coated with epoxy resin, so that the reinforcing effect is achieved.

As shown in fig. 3 and 4, one end of each of the right short-side web member 3, the left short-side web member 4, and the rest of the middle web members is a groove-shaped interface, and the other end thereof is a common screw hole interface; as shown in fig. 5, one end of the left middle web rod 19 and the right middle web rod 13 is a groove-shaped interface, and the other end is a corner-shaped interface, so as to be conveniently connected with the rest of the components.

The utility model discloses the part not mentioned is applicable to prior art.

Claims

1. A continuous beam bridge reinforcing structure is characterized by comprising a left frame body, cross beams and a right frame body, wherein the left frame body and the right frame body are symmetrically arranged on the left side and the right side of a main beam top plate of a continuous beam bridge, and the left frame body and the right frame body are connected through the cross beams, so that the reinforcing structure is in a truss structure;

the left frame body and the right frame body are identical in structure, wherein the left frame body comprises a left long-side web member, a left short-side web member, a left upper chord member, a left first middle web member, a left second middle web member, a left third middle web member, a left fourth middle web member, a left fifth middle web member and a left sixth middle web member;

the lower end of the left long-side web member is fixedly connected with the main beam top plate, the upper end of the left long-side web member is connected with the upper end of the left upper chord member, the upper end of the left middle web member III and one end of the crossbeam III, the lower end of the left upper chord member is connected with the upper end of the left short-side web member, the upper end of the left middle web member VI and one end of the crossbeam I, and the lower end of the left short-side web member is fixedly connected with the main beam top plate; the lower end of the left third middle web member is connected with the lower end of the left second middle web member, the lower end of the left fourth middle web member and the main beam top plate, the left third middle web member is perpendicular to the main beam top plate, and the length of the left third middle web member is equal to the distance between the lower end connecting point of the left third middle web member and the lower end connecting point of the left long-side web member; the upper end of a second left middle web member, the upper end of a first left middle web member and one end of a fourth cross beam are all connected with the middle point of a long-side left web member, the lower end of the first left middle web member is fixedly connected with a main beam top plate, and the first left middle web member is parallel to the third left middle web member; the upper end of the left side No. four middle web members, the upper end of the left side No. five middle web members and one end of the second cross beam are fixedly connected with the middle point of the left side upper chord member, the lower ends of the left side No. five middle web members and the lower ends of the left side No. six middle web members are fixedly connected with the main beam top plate, and the lower end connection point of the left side No. five middle web members is located at the middle point between the lower end connection point of the left side short side web member and the lower end connection point of the left side No. three middle web members.

2. The continuous girder bridge reinforced structure of claim 1, wherein the left middle web member III and the right middle web member III divide the span of the reinforced structure into a mid-span and a side-span, the mid-span of the reinforced structure is 1/4-1/3 of the mid-span of the girder bridge, and the side-span of the reinforced structure is 1/5-1/4 of the side-span of the girder bridge.

3. The continuous beam bridge reinforcing structure of claim 1 or 2, wherein the length of the left short-side web is 8/25-10/25 of the distance between the lower end connecting point of the left short-side web and the lower end connecting point of the left middle web, and the included angle between the left short-side web and the girder top plate is 55-65 °.