Concrete bridge structure spliced by steel-concrete composite beams and construction method of concrete bridge structure

Abstract

The invention discloses a concrete bridge structure adopting steel-concrete composite beams for widening and a construction method of the concrete bridge structure, belongs to the technical field of bridges, and aims to solve the problem that an original structure is easily damaged by an existing concrete bridge widening mode. The concrete bridge structure adopting the steel-concrete composite beams for widening comprises a pavement layer (4) and a supporting bridge body which are arranged up and down; a right flange plate (101) is arranged on the right side of the existing concrete bridge body (1), the newly-built steel-concrete combined bridge body (2) comprises a prefabricated concrete bridge deck slab (6) and a steel box (5) which are arranged up and down, a bracket component (3) is arranged outside the left side of the steel box (5), and the bracket component (3) can support the right flange plate (101). The concrete bridge structure adopting the steel-concrete composite beams to splice and widen can ensure that the new steel bridge body and the old concrete bridge body synchronously sink when being stressed, the vertical deformation difference at the joint is obviously reduced, and the overall stability and durability of the bridge are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, specifically to a concrete bridge structure widened by a steel-concrete composite beam, and also to a construction method for widening a concrete bridge using a steel-concrete composite beam. Background Art

[0002] With the rapid development of modern social economy, the burden on the transportation system is increasing day by day. As a key node in the transportation network, the importance of bridges is self-evident. However, the current traffic volume borne by bridges is increasing day by day, making it difficult to meet the needs of modern society. This not only poses a threat to the structural safety of bridges but also brings great pressure to urban traffic.

[0003] With the sharp growth of the population and the number of motor vehicles, bridges on urban arterial roads and highways are often overloaded, posing a huge test to the bridge structure. In addition, the rapid development of modern logistics industry has led to a continuous increase in the number of large freight vehicles. The loads of these vehicles are much higher than those of ordinary small vehicles, causing more serious damage to bridges, resulting in frequent bridge damage incidents, which not only increase the maintenance cost but also seriously affect the service life of bridges.

[0004] From a technical perspective, the design and construction standards of bridges often lag behind the speed of traffic development, resulting in huge pressure on bridge structures and accelerating aging. In addition, due to the long-term lack of effective maintenance and inspection of many bridges, about 10% of the bridges have varying degrees of diseases and safety hazards, reducing the bearing capacity, affecting normal use, and posing a major threat to traffic safety.

[0005] To cope with the increasing traffic burden, building new bridges is costly and disrupts traffic, causing inconvenience. Existing methods for widening concrete bridges, such as bonded rebar connections, are prone to damaging the original structure, reducing the bearing capacity, and cracks at the connection due to the difference in material properties between the new and old bridges, affecting driving safety and smoothness. Summary of the Invention

[0006] In order to solve the problem that the existing method for widening concrete bridges is prone to damaging the original structure, the present invention provides a concrete bridge structure widened by a steel-concrete composite beam and its construction method. The concrete bridge structure widened by a steel-concrete composite beam can ensure that the new steel bridge body and the old concrete bridge body sink synchronously under load, significantly reducing the vertical deformation difference at the joint and ensuring the overall stability and durability of the bridge. At the same time, this structure abandons the traditional bonded rebar construction, completely avoiding the potential damage risk to the original bridge structure, providing a new safe, efficient, and environmentally friendly way for bridge widening and reconstruction.

[0007] The technical solution adopted by the embodiments of the present invention to solve its technical problems is:

[0008] A widened concrete bridge structure using a steel-concrete composite beam. The widened concrete bridge structure using a steel-concrete composite beam includes a paving layer and a supporting bridge body arranged vertically. The supporting bridge body includes an existing concrete bridge body and a newly built steel-concrete composite bridge body arranged horizontally. A right wing flange is provided on the right side of the existing concrete bridge body. The newly built steel-concrete composite bridge body includes a precast concrete bridge deck and a steel box arranged vertically. A corbel member is provided outside the left side of the steel box. The right wing flange and the corbel member are arranged vertically, and the corbel member can support the right wing flange.

[0009] A construction method for the widened concrete bridge structure using a steel-concrete composite beam as described above. The construction method for the widened concrete bridge structure using a steel-concrete composite beam successively includes the following steps:

[0010] Step 1: Clean the existing concrete bridge body;

[0011] Step 2: Construct the steel box and the corbel member;

[0012] Step 3: Install the precast concrete bridge deck;

[0013] Step 4: Lay the paving layer.

[0014] The beneficial effects of the embodiments of the present invention are:

[0015] 1. Reduce the vertical deformation difference at the joint, and ensure the overall stability and safety of the bridge structure.

[0016] 2. Avoid potential damage to the original bridge structure caused by improper post-implantation of steel bars.

[0017] 3. Avoid the cracking problem caused by inconsistent shrinkage and creep between the new and old bridge bodies, and improve the durability and service life of the bridge.

[0018] 4. Shorten the on-site construction period and reduce the interference to the surrounding environment.

[0019] 5. Adapt to different bridge forms and span requirements, and provide more selection space for bridge widening and reconstruction. Description of the Drawings

[0020] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0021] Figure 1 It is a schematic diagram of the widened concrete bridge structure using a steel-concrete composite beam described in the present invention.

[0022] Figure 2 It is a schematic diagram of the newly built steel-concrete composite bridge body.

[0023] Figure 3It is a schematic diagram of a precast concrete bridge deck.

[0024] Figure 4 It is a schematic diagram of the arrangement of shear studs on the steel box.

[0025] Figure 5 It is a schematic diagram of a tensile steel bar mesh.

[0026] The description of the reference numerals is as follows:

[0027] 1. Existing concrete bridge body; 2. New steel-concrete composite bridge body; 3. Bracket member; 4. Pavement layer; 5. Steel box; 6. Precast concrete bridge deck; 7. Flange plate support; 8. Shear stud; 9. Expansion joint; 10. Tensile steel bar mesh; 11. Upper surface layer;

[0028] 101. Right flange plate;

[0029] 301. Upper side plate; 302. Vertical plate; 303. Lower side plate; 304. First stiffening rib plate;

[0030] 401. Left section; 402. Intermediate transition section; 403. Right section;

[0031] 501. Top plate; 502. Web; 503. Bottom plate; 504. Second stiffening rib plate;

[0032] 601. Adapted hole position;

[0033] 1001. Horizontal transverse steel bar; 1002. Horizontal longitudinal steel bar. Detailed implementation manners

[0034] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0035] For the convenience of understanding and description, an absolute positional relationship is adopted in the following description of the present invention. Without special explanation, the orientation word "upper" herein represents Figure 1 the upper side direction in Figure 1 the orientation word "lower" represents Figure 1 the lower side direction in Figure 1 the orientation word "left" represents Figure 1 the left side direction in Figure 1the paper surface and points to the direction outside the paper surface. The present invention is described from the perspective of the observer or user of the reader, but the above orientation terms should not be understood or construed as limiting the protection scope of the present invention. Regarding the dimensions, angles, parameters, etc. of the components therein, those skilled in the art can specifically determine or replace them according to actual needs or limited tests.

[0036] As Figures 1 to 2 shown, a steel-concrete composite beam widened concrete bridge structure described in an embodiment of the present invention includes a paving layer 4 and a supporting bridge body arranged up and down. The supporting bridge body includes an existing concrete bridge body 1 and a newly built steel-concrete composite bridge body 2 arranged left and right. A right wing flange 101 is arranged on the right side of the existing concrete bridge body 1. The newly built steel-concrete composite bridge body 2 includes a precast concrete bridge deck 6 and a steel box 5 arranged up and down. A bracket member 3 is arranged outside the left side of the steel box 5. The right wing flange 101 and the bracket member 3 are arranged up and down, and the bracket member 3 can support the right wing flange 101.

[0037] The extending direction of the existing concrete bridge body 1 is the same as that of the newly built steel-concrete composite bridge body 2. The newly built steel-concrete composite bridge body 2 extends in the front-rear direction. The steel box 5 extends along the extending direction of the newly built steel-concrete composite bridge body 2. The cross-section of the steel box 5 is rectangular. The steel box 5 includes a top plate 501, a web 502, and a bottom plate 503 connected in sequence from top to bottom. The two webs 502 are arranged at intervals left and right. The bracket member 3 is welded to the left web 502.

[0038] The bracket member 3 is welded to the upper part of the left web 502. The bracket member 3 includes an upper side plate 301, a vertical plate 302, and a lower side plate 303 connected in sequence from top to bottom. First reinforcing rib plates 304 are arranged on both the front and rear sides of the vertical plate 302. The upper side plate 301 is in a horizontal state, the vertical plate 302 and the first reinforcing rib plates 304 are in an upright state, and the lower side plate 303 is in an inclined state.

[0039] As Figures 1 to 2 shown, both the upper side plate 301 and the top plate 501 are in a horizontal state. The upper side plate 301 and the top plate 501 can be connected as a whole. The upper surface of the upper side plate 301 is flush with the upper surface of the top plate 501. Second reinforcing rib plates 504 can be welded to the inner sides of the webs 502 and the bottom plate 503. The right side of the right wing flange 101 is arranged at an interval up and down with the left side of the bracket member 3.

[0040] The bracket member 3 is coordinated with the arrangement of the diaphragms and cross beams of the newly built steel-concrete composite bridge body 2, and can be accurately manufactured in a prefabrication factory or flexibly welded on the construction site. The top of the bracket member 3 is flush with the top of the composite beam steel box 5, and a space is reserved to accommodate the following wing flange support 7, effectively supporting the wing flange of the existing concrete bridge body 1 and realizing the coordinated deformation of the new and old bridges under vertical loads.

[0041] AsFigures 1 to 2 As shown, the precast concrete bridge deck 6 is connected in a stacked manner both above and below with the steel box 5 and the bracket member 3. A part (left end part) of the precast concrete bridge deck 6 is located above the bracket member 3, and another part (other parts) of the precast concrete bridge deck 6 is located above the steel box 5.

[0042] As Figure 1 , Figure 3 and Figure 4 As shown, a plurality of shear studs 8 are connected to the upper surface of the upper side plate 301 of the bracket member 3 and the upper surface of the top plate 501 of the steel box 5. The plurality of shear studs 8 can be called clustered shear studs. A plurality of matching hole positions 601 are provided on the precast concrete bridge deck 6, and the matching hole positions 601 are connected to the shear studs 8 in a one-to-one correspondence. These shear studs 8 effectively connect the precast concrete bridge deck 6 and the steel box 5 tightly, forming an integral structure.

[0043] The precast concrete bridge deck 6 is fabricated in the factory with the matching hole positions 601 reserved and is tightly connected to the steel box 5 by means of the clustered shear studs 8. Before leaving the factory, the precast concrete bridge deck 6 needs to undergo a period of static storage to ensure that its internal shrinkage and creep are fully completed, thereby effectively preventing the generation of longitudinal cracks between the new and old bridge bodies.

[0044] A space is reserved at the top of the bracket member 3. The right side of the right wing flange 101 of the existing concrete bridge body 1 is connected to the left side of the bracket member 3 through the right wing flange support 7. The material of the right wing flange support 7 is preferably recommended to use materials such as felt or polymer mortar to ensure its support effect.

[0045] As Figures 1 to 2 shown, the right wing flange 101 of the existing concrete bridge body 1 and the precast concrete bridge deck 6 are directly opposite left and right. A deformation joint 9 is provided between the right wing flange 101 of the existing concrete bridge body 1 and the precast concrete bridge deck 6, and the deformation joint 9 is filled with a foam plastic board and polymer mortar. The width of the deformation joint 9 does not exceed 2 cm to adapt to the lateral deformation of the bridge and provide adaptability and stability.

[0046] The paving layer 4 covers the bridge surface at the junction of the existing concrete bridge body 1 and the new steel-concrete composite bridge body 2 to achieve continuous bridge deck. The material of the paving layer 4 is mainly concrete. The paving layer 4 includes a left section 401, an intermediate transition section 402, and a right section 403 arranged in sequence from left to right. The left side of the intermediate transition section 402 is connected in a stacked manner above and below with the right side (right wing flange 101) of the existing concrete bridge body 1, and the right side of the intermediate transition section 402 is connected in a stacked manner above and below with the left side of the new steel-concrete composite bridge body 2 (precast concrete bridge deck 6).

[0047] Before laying the pavement layer 4, the guardrails, existing cast-in-place layers and pavement layers of the existing concrete bridge body 1 need to be removed to ensure that the pavement layer 4 of the new and old bridge bodies can form a unified overall structure. The recast pavement layer 4 can achieve the continuity of the bridge deck of the existing concrete bridge body 1 and the newly built steel-concrete composite bridge body 2, and enhance the collaborative deformation capacity of the two under vertical loads, effectively reducing the vertical deformation of the joint. In order to prevent deformation and cracks caused by material shrinkage creep, the pavement layer 4 should be cast with high-strength UHPC materials.

[0048] like Figure 1 and Figure 5 As shown, the left section 401 and the right section 403 are both made of UHPC (ultra-high performance concrete), and the middle transition section 402 contains a double-layer tensile steel mesh 10, which contains a plurality of horizontal transverse steel bars 1001 and a plurality of horizontal longitudinal steel bars 1002.

[0049] Multiple horizontal transverse steel bars 1001 and multiple horizontal longitudinal steel bars 1002 are arranged in a staggered manner, the horizontal transverse steel bars 1001 extend in the left-right direction, and the horizontal longitudinal steel bars 1002 extend in the front-back direction. The tensile steel mesh 10 forms a strong tension system that can resist tension from different directions and prevent damage to the internal structure.

[0050] In the steel-concrete composite beam-widened concrete bridge structure described in the present invention, a steel structure corbel member 3 is arranged on the web 502 of the new steel-concrete composite bridge body 2 to achieve coordinated deformation of the new and old bridges and reduce the risk of anchoring; the support space and deformation joint reserved above the corbel member 3 bear the load of the flange of the existing concrete bridge and adapt to the natural lateral deformation of the bridge during normal use; a double-layer staggered tensile steel mesh 10 is arranged in the pavement layer 4, and high-strength UHPC paving is adopted to enhance the overall strength of the pavement layer, ensure the continuity of the bridge deck, and improve the fatigue resistance of the steel bridge deck; clustered shear nails 8 are used to connect the precast concrete bridge deck 6 and the steel box 5 to ensure the stability and durability of the connection and significantly reduce problems such as cracks caused by the incoordination of deformation between the existing bridge and the newly built bridge.

[0051] In addition, if Figure 1 As shown, the steel-concrete composite beam widened concrete bridge structure (also referred to as a bridge widening structure) also includes an upper surface layer 11. The upper surface layer 11, the pavement layer 4 and the supporting bridge body are connected in sequence from top to bottom. The upper surface layer 11 can be an asphalt pavement.

[0052] The present invention mainly includes three core parts: First, a bracket member 3 made of steel structure is adopted, and this member is fixed to the steel web of the steel box 5 by welding; second, an enhanced tensile steel bar mesh 10 is adopted, and this steel bar mesh is laid in the entire area of the joint between the old and new bridge decks to enhance the connection strength; third, a precast concrete bridge deck 6 with holes is adopted, and this structure is precisely precast in the factory and reserved with matching hole positions 601 to meet the splicing requirements. This splicing structure design can effectively reduce the vertical deformation difference at the joint, avoid the possible structural damage caused by post-inserted bar construction, prevent the cracking problem caused by the difference in material shrinkage and creep, and significantly improve the durability of the bridge.

[0053] A construction method of the above-mentioned steel-concrete composite beam widened concrete bridge structure, the construction method of the steel-concrete composite beam widened concrete bridge structure successively includes the following steps:.

[0054] Step 1, clean the existing concrete bridge body 1;

[0055] Step 2, construct the steel box 5 and the bracket member 3;

[0056] Step 3, install the precast concrete bridge deck 6;

[0057] Step 4, lay the paving layer 4;

[0058] Step 5, lay the upper surface layer 11.

[0059] The steel-concrete composite beam widened concrete bridge structure and its construction method described in the present invention, without damaging the existing bridge structure, through the precisely welded steel structure bracket member, the bridge deck paved with high-strength UHPC material, and the double-layer staggered steel bar mesh design, significantly enhance the structural strength of the connection between the old and new bridges, making the bridge more stable when bearing vertical and horizontal loads. At the same time, the reserved bearing space at the top of the bracket member and the setting of the deformation joint effectively adapt to the lateral deformation of the bridge, ensure the coordinated deformation of the old and new bridges when stressed, reduce the vertical deformation difference at the splicing, and improve the overall performance of the bridge. In addition, the use of bundled shear studs ensures the firm connection between the precast concrete bridge deck and the steel box. At the same time, the reserved shrinkage and creep period and the selection of high-strength materials effectively prevent the structural damage and cracking problems caused by the difference in material properties.

[0060] The above are only specific embodiments of the present invention, and the scope of the invention implementation cannot be limited by them. Therefore, the replacement of equivalent components, or the equivalent changes and modifications made according to the protection scope of the present invention, should still fall within the scope covered by the present invention. In addition, the technical features in the present invention, between technical features, between technical features and technical solutions, between technical solutions and technical solutions, and between embodiments and embodiments can be freely combined and used.

Claims

1. A widened concrete bridge structure using a steel-concrete composite beam, characterized in that: The widened concrete bridge structure using steel-concrete composite beams comprises a pavement layer (4) arranged up and down and a supporting bridge body, wherein the supporting bridge body comprises an existing concrete bridge body (1) and a newly built steel-concrete composite bridge body (2) arranged left and right, wherein a right flange plate (101) is arranged on the right side of the existing concrete bridge body (1), and the newly built steel-concrete composite bridge body (2) comprises a precast concrete bridge deck (6) and a steel box (5) arranged up and down, wherein a corbel component (3) is arranged outside the left side of the steel box (5), and the right flange plate (101) and the corbel component (3) are arranged up and down, and the corbel component (3) can support the right flange plate (101).

2. The widened concrete bridge structure using steel-concrete composite beams according to claim 1 is characterized in that: The steel box (5) comprises a top plate (501), a web plate (502) and a bottom plate (503) which are sequentially connected from top to bottom. The two web plates (502) are arranged at intervals on the left and right sides, and the corbel member (3) is welded to the web plate (502) on the left side.

3. The widened concrete bridge structure using steel-concrete composite beams according to claim 2 is characterized in that: The corbel component (3) comprises an upper side plate (301), a vertical plate (302) and a lower side plate (303) which are sequentially connected from top to bottom, and first reinforcing rib plates (304) are provided on both the front and rear sides of the vertical plate (302).

4. The widened concrete bridge structure using steel-concrete composite beams as claimed in claim 3 is characterized in that: The upper side plate (301) and the top plate (501) are both in a horizontal state, the upper surface of the upper side plate (301) is flush with the upper surface of the top plate (501), and the right side of the right flange plate (101) is arranged up and down with the left side of the corbel member (3).

5. The widened concrete bridge structure using steel-concrete composite beams as claimed in claim 4 is characterized in that: A portion of the precast concrete bridge deck (6) is located above the corbel member (3), and another portion of the precast concrete bridge deck (6) is located above the steel box (5).

6. The widened concrete bridge structure using steel-concrete composite beams as claimed in claim 5 is characterized in that: The upper surface of the upper side plate (301) and the upper surface of the top plate (501) are both connected with a plurality of shear nails (8), and the precast concrete bridge deck (6) is provided with a plurality of matching holes (601), and the matching holes (601) are connected with the shear nails (8) in a one-to-one correspondence.

7. The widened concrete bridge structure using steel-concrete composite beams as claimed in claim 1 is characterized in that: The right side of the right flange plate (101) is connected to the left side of the corbel member (3) via a right flange plate support (7), and the material of the right flange plate support (7) is oil felt or polymer mortar.

8. The widened concrete bridge structure using steel-concrete composite beams as claimed in claim 1 is characterized in that: A deformation joint (9) is provided between the right flange plate (101) of the existing concrete bridge body (1) and the precast concrete bridge deck (6), and the deformation joint (9) is filled with a foam plastic plate and polymer mortar.

9. The widened concrete bridge structure using steel-concrete composite beams as claimed in claim 1 is characterized in that: The pavement layer (4) comprises a left section (401), a middle transition section (402) and a right section (403) which are arranged in sequence from left to right. The left side of the middle transition section (402) is connected to the right side of the existing concrete bridge body (1) in an up-down stacking manner, and the right side of the middle transition section (402) is connected to the left side of the newly built steel-concrete composite bridge body (2) in an up-down stacking manner. The left section (401) and the right section (403) are both made of UHPC. The middle transition section (402) contains a double-layer tensile steel mesh (10), and the tensile steel mesh (10) contains horizontal transverse steel bars (1001) and horizontal longitudinal steel bars (1002).

10. A construction method of a widened concrete bridge structure using a steel-concrete composite beam as claimed in claim 1, characterized in that: The construction method of the widened concrete bridge structure using a steel-concrete composite beam comprises the following steps in sequence: Step 1: cleaning the existing concrete bridge body (1); Step 2, constructing the steel box (5) and the corbel member (3); Step 3, installing the precast concrete bridge deck (6); Step 4: Lay the paving layer (4).

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