CN-121992718-A - Combined bridge construction method

CN121992718ACN 121992718 ACN121992718 ACN 121992718ACN-121992718-A

Abstract

The invention discloses a construction method of a combined bridge, which relates to the technical field of bridge construction of a cross-line bridge and comprises the following steps of assembling a steel main beam, fixedly connecting a bottom plate combined bridge deck plate steel bottom die to the middle section of the assembled steel main beam, fixedly connecting a combined structure anti-collision guardrail steel side die to the bottom plate combined bridge deck plate steel bottom die, erecting the assembled steel main beam on the bridge section to be constructed, installing concrete bridge deck plate templates on the steel main beams on two sides of the bottom plate combined bridge deck plate steel bottom die, arranging reinforcing steel bars, arranging first anti-collision guardrail steel bars on two side spans of the bottom plate combined bridge deck plate steel bottom die and second anti-collision guardrail steel bars on the combined structure anti-collision guardrail steel side die, arranging anti-collision guardrail pouring templates outside the first anti-collision guardrail steel bars, pouring anti-collision guardrail concrete and constructing an asphalt pavement layer. The invention has simple operation and less influence on the traffic line below.

Inventors

XU ZHAO
SU QINGTIAN
XU CHANGZE
Huang Lefei
ZHAO HONGJIAO
HE BINGYU
GUAN XIKUN
ZHANG YUTAO
GUAN RUYI

Assignees

山东省交通规划设计院集团有限公司
同济大学

Dates

Publication Date: 20260508
Application Date: 20251224

Claims (10)

1.A combined bridge construction method is characterized by comprising the following steps of S1, assembling a steel main beam; S2, fixedly connecting a bottom plate combined bridge deck plate steel bottom die to the middle section of the assembled steel main beam, wherein the span of the bottom plate combined bridge deck plate steel bottom die is not smaller than the span of a traffic line below a bridge section to be constructed, and fixedly connecting a combined structure anti-collision guardrail steel side die to the bottom plate combined bridge deck plate steel bottom die; s3, arranging an assembled steel main beam, a flat bottom plate, a combined bridge deck plate steel bottom die and a combined structure anti-collision guardrail steel side die mounting frame on a bridge section to be constructed; s4, installing concrete bridge deck templates on the steel girders on two sides of the steel bottom die of the flat-bottom plate combined bridge deck plate; S5, arranging first reinforcing steel bars in the concrete bridge deck templates at two sides of the bottom plate combined bridge deck plate steel die block, and arranging second reinforcing steel bars in the bottom plate combined bridge deck plate steel die block; S6, pouring side span positive bending moment areas on two sides of the bottom plate combined bridge deck plate steel bottom die, then pouring positive bending moment areas on the bottom plate combined bridge deck plate steel bottom die, and finally pouring negative bending moment areas on the bottom plate combined bridge deck plate steel bottom die; s7, arranging first anti-collision guardrail steel bars of side spans at two sides of a bottom die of a steel die of a flat-bottom combined bridge deck plate and second anti-collision guardrail steel bars of a side die of the combined structure anti-collision guardrail steel; s8, arranging an anti-collision guardrail pouring template outside the first anti-collision guardrail steel bars; s9, pouring first anti-collision guardrail concrete and second anti-collision guardrail concrete; And S10, constructing an asphalt pavement layer.
2. The method for constructing a composite bridge according to claim 1, wherein step S2 comprises S21, spot-welding the bottom steel die of the combined bridge deck plate with the middle section of the steel main beam, and spot-welding the side steel die of the combined structure anti-collision guardrail with the bottom steel die of the combined bridge deck plate.
3. The method for constructing a composite bridge according to claim 2, further comprising steps S31 and S32 after step S3 S31, checking whether the deformation of the bottom plate combined bridge deck plate steel bottom die exceeds a preset value, and continuously welding the bottom plate combined bridge deck plate steel bottom die with the middle section of the steel girder if the deformation does not exceed the preset value; s32, checking whether the deformation of the side die of the combined structure anti-collision guardrail steel exceeds a preset value, continuously welding the side die of the combined structure anti-collision guardrail steel with the bottom die of the combined bridge deck plate steel if the deformation does not exceed the preset value, and continuously welding the side die of the combined structure anti-collision guardrail steel with the bottom die of the combined bridge deck plate steel if the deformation exceeds the preset value.
4. The method according to claim 1, wherein the concrete deck slab formwork in the step S4 comprises a bracket and a wood formwork, the bracket is supported on the lower flange of the steel girder, the wood formwork is placed on the bracket, and the upper surface of the wood formwork and the lower surface of the bottom formwork are on the same horizontal line.
5. The method of constructing a composite bridge according to claim 1, wherein in the step S5, the first reinforcing mesh is a double-layer reinforcing mesh, the second reinforcing mesh is a single-layer reinforcing mesh, the double-layer reinforcing mesh comprises two layers of vertical and horizontal reinforcing bars distributed vertically and horizontally, the single-layer reinforcing mesh comprises one layer of vertical and horizontal reinforcing bars, the vertical and horizontal reinforcing bars on the upper layer of the first reinforcing mesh and the vertical reinforcing bars on the lower layer of the second reinforcing mesh are in the same horizontal plane, and the longitudinal reinforcing bars on the upper layer of the first reinforcing mesh and the longitudinal reinforcing bars on the lower layer of the second reinforcing mesh are the same reinforcing bars.
6. The method for constructing a composite bridge according to claim 1, further comprising step S61 before step S6 And S61, checking whether water leaks between the bottom plate combined bridge deck plate steel bottom die and the upper flange of the steel main beam and between the side die of the combined structure anti-collision guardrail steel and the bottom plate combined bridge deck plate steel bottom die, pouring concrete if the water leaks and the bottom plate combined bridge deck plate steel bottom die needs to be plugged, and directly pouring concrete if the water leaks and the bottom plate combined bridge deck plate steel bottom die does not leak.
7. The method of constructing a composite bridge according to claim 1, wherein the first and second balustrade reinforcement bars each include transverse and longitudinal reinforcement bars arranged in a staggered manner in step S7, and the longitudinal reinforcement bars of the first and second balustrade reinforcement bars are the same reinforcement bar.
8. The method of constructing a composite bridge according to claim 1, wherein in the step S8, the crash barrier pouring formwork is a shaped steel formwork, and the inner surface of the crash barrier pouring formwork and the outer surface of the side mold of the crash barrier steel of the composite structure are in the same horizontal plane.
9. The method for constructing a composite bridge according to claim 1, wherein the step S3 is a construction method of integral pushing.
10. The method for constructing a composite bridge according to claim 3, wherein the bottom steel die of the composite deck plate is connected with the middle section of the main steel beam through a stiffening rib.

Description

Combined bridge construction method Technical Field The invention relates to the technical field of cross-line bridge construction, in particular to a combined bridge construction method. Background The existing steel-concrete combined bridge deck mainly adopts a mode of pouring wood templates on site for construction, and the construction method mainly has the defects that (1) after the steel beam is erected, the wood templates are required to be installed through hanging a die or erecting a bracket supporting system, after the strength of the bridge deck meets the requirement, the wood templates and corresponding supporting structures are required to be dismantled, and a large amount of under-bridge operations are unavoidable in the process, so that the construction operation is complicated, the construction difficulty is high, and the construction efficiency is low. (2) Because gaps exist between the wood templates, foam rubber is often adopted for sealing to prevent mortar from flowing out, even if the concrete mortar is subjected to dead weight, the situation that the concrete mortar overflows from the gaps of the templates still occurs, and if a bridge spans a traffic line, the overflowed mortar drips to influence the lower side passage. If the lower traffic is closed during construction, a large economic loss of traffic is caused. (3) A structure system or hoist system for supporting timber apron temporarily appears connecting insecure condition easily, in case bearing structure inefficacy under the concrete dead weight, very easily leads to timber apron whole to drop, brings the potential safety hazard to downside traffic. Therefore, there is a need for a method of constructing a composite bridge to solve the above-mentioned problems. Disclosure of Invention The invention aims to provide a combined bridge construction method which solves the problems in the prior art, is simple and convenient to operate and has small influence on a traffic line below. In order to achieve the above object, the present invention provides the following solutions: The invention provides a construction method of a combined bridge, which comprises the following steps of S1, assembling a steel main beam; S2, fixedly connecting a bottom plate combined bridge deck plate steel bottom die to the middle section of the assembled steel main beam, wherein the span of the bottom plate combined bridge deck plate steel bottom die is not smaller than the span of a traffic line below a bridge section to be constructed, and fixedly connecting a combined structure anti-collision guardrail steel side die to the bottom plate combined bridge deck plate steel bottom die; s3, arranging an assembled steel main beam, a flat bottom plate, a combined bridge deck plate steel bottom die and a combined structure anti-collision guardrail steel side die mounting frame on a bridge section to be constructed; s4, installing concrete bridge deck templates on the steel girders on two sides of the steel bottom die of the flat-bottom plate combined bridge deck plate; S5, arranging first reinforcing steel bars in the concrete bridge deck templates at two sides of the bottom plate combined bridge deck plate steel die block, and arranging second reinforcing steel bars in the bottom plate combined bridge deck plate steel die block; S6, pouring side span positive bending moment areas on two sides of the bottom plate combined bridge deck plate steel bottom die, then pouring positive bending moment areas on the bottom plate combined bridge deck plate steel bottom die, and finally pouring negative bending moment areas on the bottom plate combined bridge deck plate steel bottom die; s7, arranging first anti-collision guardrail steel bars of side spans at two sides of a bottom die of a steel die of a flat-bottom combined bridge deck plate and second anti-collision guardrail steel bars of a side die of the combined structure anti-collision guardrail steel; s8, arranging an anti-collision guardrail pouring template outside the first anti-collision guardrail steel bars; s9, pouring first anti-collision guardrail concrete and second anti-collision guardrail concrete; And S10, constructing an asphalt pavement layer. In some embodiments, step S2 comprises S21, spot-welding the bottom steel die of the combined bridge deck plate with the middle section of the steel main beam, and spot-welding the side steel die of the combined structure anti-collision guardrail with the bottom steel die of the combined bridge deck plate. In some embodiments, step S3 is followed by steps S31 and S32 S31, checking whether the deformation of the bottom plate combined bridge deck plate steel bottom die exceeds a preset value, and continuously welding the bottom plate combined bridge deck plate steel bottom die with the middle section of the steel girder if the deformation does not exceed the preset value; s32, checking whether the deformation of the side die of the combined structure anti-collisi