New and old bridge widening structure for improving shrinkage and creep difference influence

Abstract

The utility model relates to a new and old bridge widening structure capable of improving the influence of shrinkage and creep differences. A widening position asphalt concrete pavement layer, a zinc-containing steel plate, a waterproof roll, a profile steel rib plate, a cork block and a longitudinal steel plate are arranged at the widening position of an old bridge box girder and a new bridge box girder. The longitudinal steel plates are arranged at intervals in the longitudinal bridge direction, each longitudinal steel plate is welded to the corresponding load-bearing steel bar in the box girder, grooves are reserved in the two ends of each longitudinal steel plate, and the grooves in the two ends of each longitudinal steel plate are filled with the cork blocks. The zinc-containing steel plates are vertically arranged between every two adjacent longitudinal steel plates, the width-spliced asphalt concrete pavement layer is laid on the tops of the zinc-containing steel plates, kerfs in the longitudinal bridge direction are formed in the left-right middle positions of the surface of the width-spliced asphalt concrete pavement layer, and the kerfs are filled with asphalt horseshoe fat. According to the utility model, a new bridge structure and an old bridge structure are connected together, and the damage form is always controlled in an asphalt horseshoe fat area, so that the damage of a bridge deck pavement layer is prevented, and the overall stability of the structure is also protected.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering technical field, concretely relates to a new and old bridge splicing wide structure and construction method of improvement contract shrinkage difference influence. BACKGROUND

[0002] With the sharp expansion of traffic flow in our country, the load pressure of highway bridge continues to rise, which makes the traffic capacity of existing road gradually unable to match the growing traffic demand. Compared with the new highway project, the reconstruction and expansion of existing highway shows significant advantages in controlling investment cost and shortening construction period, and the highway reconstruction and expansion will become the main strategy to promote highway widening reconstruction. Under the premise of balancing economy and practicability, through the widening and reinforcement treatment of existing bridge, not only the safety and stability of the bridge can be ensured, but also the original bridge structure can be efficiently utilized, and the economic value is maximized.

[0003] At present, when considering the long-term creep effect of new bridge in the process of splicing new and old bridges, the existing structure form cannot well connect the new and old bridges and ensure the relative displacement, and the influence of the longitudinal bridge shrinkage and creep of the new bridge on the structure is not considered. CONTENT OF UTILITY MODEL

[0004] In view of the defects existing in the prior art, the technical problem to be solved by the utility model is to provide a new and old bridge splicing wide structure and construction method, which can significantly improve the damage caused by shrinkage and creep difference to the old bridge, and improve the durability, driving comfort and overall stability of the structure.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a new and old bridge beam splicing structure for improving the influence of shrinkage and creep difference, which comprises old bridge box girders and new bridge box girders arranged left and right, and is provided with a splicing place asphalt concrete pavement layer, zinc-containing steel plate, waterproof roll material, profile steel rib plate, cork block and longitudinal steel plate at the splicing place of the old bridge box girders and the new bridge box girders, the profile steel rib plate is arranged below the flange plate of the old bridge box girders and tightly abuts against the flange plate of the old bridge box girders; a plurality of longitudinal steel plates are arranged at intervals along the longitudinal direction of the bridge, each longitudinal steel plate is vertically placed and the left and right ends of each longitudinal steel plate are respectively inserted into the flange plates of the old bridge box girders and the new bridge box girders and are welded with the stress reinforcement in the corresponding box girders, the both ends of each longitudinal steel plate are provided with grooves, and the cork block is filled in the grooves at the both ends of the longitudinal steel plate; the zinc-containing steel plate is vertically arranged between the two adjacent longitudinal steel plates, the front and back ends of the zinc-containing steel plate are welded to the middle portions of the two longitudinal steel plates, the upper portion of the zinc-containing steel plate extends out of the top of the longitudinal steel plate, and the waterproof roll material is arranged on the both sides of the extending portion, the splicing place asphalt concrete pavement layer is arranged on the waterproof roll material and the top of the zinc-containing steel plate, a longitudinal cutting seam is formed in the middle of the surface of the splicing place asphalt concrete pavement layer, the depth of the cutting seam is half of the thickness of the splicing place asphalt concrete pavement layer, and the cutting seam is filled with asphalt horseshoe fat, and the width of the longitudinal steel plate, the width of the waterproof roll material and the width of the splicing place asphalt concrete pavement layer are in a stepped increasing mode.

[0006] Preferably, the profile steel rib plate is fixedly connected with the old bridge box girders through high-strength bolts to strengthen the structural strength of the old bridge.

[0007] Preferably, each profile steel rib plate is provided with a group of high-strength bolts on the front and back sides, each group of high-strength bolts is provided with 3-5 high-strength bolts, and the high-strength bolts are arranged at intervals left and right to balance the stress.

[0008] Preferably, the top of the waterproof roll material is flush with the top of the zinc-containing steel plate, and the bottom of the zinc-containing steel plate is flush with the bottom of the longitudinal steel plate.

[0009] Preferably, an asphalt felt waterproof layer is arranged above the waterproof roll material and the zinc-containing steel plate.

[0010] Preferably, the longitudinal steel plate is provided with a welding plate at the both ends, and the longitudinal steel plate is welded with the stress reinforcement through the welding plate to increase the welding area.

[0011] A construction method for improving the influence of shrinkage and creep difference of new and old bridge beam splicing, adopts a new and old bridge beam splicing structure for improving the influence of shrinkage and creep difference, and the steps are as follows:

[0012] Step one, close the old bridge box girders and the new bridge box girders adjacent lanes, remove the guardrails of the old bridge box girders, and remove the concrete pavement in the width range of the flange plate of the old bridge box girders to expose the stress reinforcement;

[0013] Step two, drill bolt connection holes in the lower part of the flange plate of the old bridge box girder, and install the profile steel rib plate on the old bridge box girder through high-strength bolts;

[0014] Step three: drill out softwood blocks and longitudinal steel plate installation positions at the corresponding positions of the old bridge box girder and the new bridge box girder, install the longitudinal steel plate and weld the two ends of the longitudinal steel plate with the corresponding stress reinforcement respectively; fill the softwood blocks in front of and behind the welded end of the longitudinal steel plate;

[0015] Step four: install and weld the zinc-containing steel plate between the adjacent longitudinal steel plates; fill the polyurethane waterproof roll material on the left and right of the zinc-containing steel plate extension part, and install the asphalt felt waterproof layer above the zinc-containing steel plate and the polyurethane waterproof roll material;

[0016] Step five: respectively cast the old bridge waterproof concrete cast-in-place layer and the new bridge waterproof concrete cast-in-place layer in the full bridge range of the old bridge box girder and the new bridge box girder, and the pouring height is flush with the polyurethane waterproof roll material;

[0017] Step six: cast the asphalt concrete pavement layer above the zinc-containing steel plate and the polyurethane waterproof roll material, and the asphalt concrete pavement layer is flush with the old bridge asphalt concrete pavement layer and the new bridge asphalt concrete pavement layer;

[0018] Step seven: cut a longitudinal cut in the middle position of the asphalt concrete surface layer of the asphalt concrete pavement layer, and the depth of the cut is half of the thickness of the asphalt concrete pavement layer; fill the asphalt horse hoof fat in the cut;

[0019] Step eight: construction is completed, and traffic is restored;

[0020] Step nine: close the traffic, and remove the damaged asphalt concrete pavement layer above the cut in the later stage of the new bridge box girder;

[0021] Step ten: cast concrete in the adjacent zinc-containing steel plate;

[0022] Step eleven: re-pave the asphalt concrete pavement layer at the position removed in step nine, and cut the longitudinal cut and fill the asphalt horse hoof fat again according to step seven;

[0023] Step twelve: construction is completed, and traffic is restored.

[0024] The beneficial effects of the utility model are as follows:

[0025] 1) The longitudinal steel plate and the stress reinforcement are welded to fix the position of the new and old bridges, ensure that the new and old bridge structures are integrated, so that the new and old bridges are jointly stressed as a whole; meanwhile, the installation and alignment of the softwood block are facilitated, the softwood block is installed at both ends of the longitudinal steel plate, when the new bridge longitudinally shrinks, the softwood block is buffered, and the damage to the old bridge after the new and old bridge widening is reduced;

[0026] 2) In the two adjacent longitudinal steel plates, the zinc-containing steel plate is vertically inserted to improve the overall structural strength, the waterproof roll material is installed on the left and right sides of the zinc-containing steel plate extending out of the longitudinal steel plate part, the asphalt concrete paving is carried out thereon, the half of the thickness of the asphalt layer is cut from the left and right center positions of the asphalt layer surface, and the asphalt horseshoe fat is filled in the cutting seam; when the widening part is affected by the new bridge creep, the asphalt horseshoe fat can absorb and disperse stress, so that damage only occurs at the horseshoe fat position, the bridge deck paving layer is prevented from being affected by shrinkage and creep, and the durability, driving comfort and overall stability of the structure are improved;

[0027] 3) The widening structure for connecting the new and old bridges saves the materials and costs of other anchoring connecting pieces, connects the new and old bridges together, and reinforces the old bridge through the steel rib plate at the cantilever section of the old bridge, so that the structural strength of the old bridge is strengthened. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic view of the utility model;

[0029] Figure 2 It is an old bridge cross-sectional view of the utility model;

[0030] Figure 3 It is a top view of the longitudinal bridge new and old bridge connection position;

[0031] In the drawing: 1 - old bridge asphalt concrete paving layer, 2 - old bridge waterproof concrete cast-in-place layer, 3 - asphalt concrete paving layer at the widening part, 4 - asphalt felt waterproof layer, 5 - asphalt horseshoe fat, 6 - zinc-containing steel plate, 7 - polyurethane waterproof roll material, 8 - new bridge asphalt concrete paving layer, 9 - new bridge waterproof concrete cast-in-place layer, 10 - high-strength bolt, 11 - steel rib plate, 12 - stress reinforcement, 13 - cork block, 14 - longitudinal steel plate, 15 - old bridge box girder, 16 - new bridge box girder, 17 - concrete, 18 - welded plate. DETAILED DESCRIPTION

[0032] In order to better understand the improvements made by the utility model compared with the prior art, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0033] As shown in the drawing, Figure 1 An old and new bridge widening structure for improving the influence of shrinkage and creep difference has left and right old bridge box girders 15 and new bridge box girders 16, and the widening structure of the old bridge box girder 15 and the new bridge box girder 16 is mainly composed of an asphalt concrete paving layer 3 at the widening part, a zinc-containing steel plate 6, a waterproof roll material 7, a steel rib plate 11, a cork block 13 and a longitudinal steel plate 14.

[0034] AsFigure 2 As shown, in order to strengthen the structural strength of the old bridge box girder 15, the steel rib plate 11 is arranged below the flange plate of the old bridge box girder 15 and tightly abuts against the flange plate of the old bridge box girder 15, and the steel rib plate 11 is fixedly connected with the old bridge box girder 15 through high-strength bolts 10. In order to balance the structure stress and facilitate construction, each steel rib plate 11 is equipped with a group of high-strength bolts 10 on the front and back sides, and each group of high-strength bolts 10 is provided with 3-5 high-strength bolts, which are arranged at intervals.

[0035] As shown, Figure 3 In order to make the new and old bridge structures be connected as a whole and bear stress together, a plurality of longitudinal steel plates 14 are arranged at intervals along the longitudinal direction between the old bridge box girder 15 and the new bridge box girder 16, each longitudinal steel plate 14 is vertically placed and the left and right ends are respectively inserted into the flange plates of the old bridge box girder 15 and the new bridge box girder 16 and welded with the stress reinforcement bars 12 in the corresponding box girders. The two ends of the longitudinal steel plate 14 are provided with welding plates 18, and the longitudinal steel plate 14 is welded with the stress reinforcement bars 12 through the welding plates 18 to increase the welding area. The two ends of each longitudinal steel plate 14 are provided with grooves, and the cork blocks 13 are filled in the grooves at the two ends of the longitudinal steel plate 14. When the new bridge longitudinally shrinks, the cork blocks 13 are used for buffering to reduce the damage to the old bridge after the new and old bridges are widened.

[0036] A zinc-containing steel plate 6 is vertically arranged between the two adjacent longitudinal steel plates 14, the front and back ends of the zinc-containing steel plate 6 are welded to the middle portions of the two longitudinal steel plates 14, and the bottom of the zinc-containing steel plate 6 is flush with the bottom of the longitudinal steel plate 14. The upper portion of the zinc-containing steel plate 6 extends out of the top of the longitudinal steel plate 14. Waterproof coiled material 7 is laid on the left and right sides of the extended portion of the zinc-containing steel plate 6, the top of the waterproof coiled material 7 is flush with the top of the zinc-containing steel plate 6, and an asphalt felt waterproof layer 4 is arranged above the waterproof coiled material 7 and the zinc-containing steel plate 6.

[0037] The asphalt concrete paving layer 3 at the widened portion is laid on the top of the waterproof coiled material 7 and the zinc-containing steel plate 6, and a longitudinal cutting seam is formed in the middle of the left and right sides of the surface of the asphalt concrete paving layer 3 at the widened portion, and the depth of the cutting seam is half of the laying thickness of the asphalt concrete paving layer 3 at the widened portion. The cutting seam is filled with asphalt horseshoe fat 5, which can absorb and disperse stress when the widened portion is affected by the creep of the new bridge, so that the damage only occurs at the position of the asphalt horseshoe fat 5, avoiding the influence of the shrinkage creep on the bridge deck pavement. At the same time, the width of the longitudinal steel plate 14, the width of the waterproof coiled material 7 and the width of the asphalt concrete paving layer 3 at the widened portion are increased in steps, which is convenient for construction.

[0038] A construction method for improving the influence of the shrinkage creep difference of the new and old bridge widening, which adopts a new and old bridge widening structure for improving the influence of the shrinkage creep difference, and the steps are as follows:

[0039] Step one, close the old bridge box girder 15 and new bridge box girder 16 construction adjacent lane, remove the old bridge box girder 15 guardrail, chisel out the old bridge box girder 15 flange plate width range of concrete pavement, expose the force steel bar 12;

[0040] Step two, drill bolt connection hole in the lower part of the flange plate of the old bridge box girder 15, and install the steel rib plate 11 to the lower part of the old bridge box girder 15 through high-strength bolt 10;

[0041] Step three: chisel out the rubber block 13 and the installation position of longitudinal steel plate 14 at the corresponding position of old bridge box girder 15 and new bridge box girder 16, install longitudinal steel plate 14 and weld the two ends of longitudinal steel plate 14 with corresponding force steel bar 12 respectively; fill rubber block 13 in front and back of the end of welded longitudinal steel plate 14;

[0042] Step four: install zinc-containing steel plate 6 between adjacent longitudinal steel plate 14 and weld and fix; fill polyurethane waterproof roll 7 on the left and right of the protruding part of zinc-containing steel plate 6, and install asphalt felt waterproof layer 4 above zinc-containing steel plate 6 and polyurethane waterproof roll 7;

[0043] Step five: pour old bridge waterproof concrete cast-in-place layer 2 and new bridge waterproof concrete cast-in-place layer 9 in the whole bridge range of old bridge box girder 15 and new bridge box girder 16 respectively, and the pouring height is flush with polyurethane waterproof roll 7;

[0044] Step six: pour asphalt concrete pavement layer 3 above zinc-containing steel plate 6 and polyurethane waterproof roll 7, and the asphalt concrete pavement layer 3 is flush with old bridge asphalt concrete pavement layer 1 and new bridge asphalt concrete pavement layer 8;

[0045] Step seven: cut a longitudinal joint in the middle position of the asphalt concrete surface layer of the asphalt concrete pavement layer 3 on the left and right, and the depth of the joint is half of the thickness of the asphalt concrete pavement layer 3; fill asphalt horseshoe fat 5 in the joint;

[0046] Step eight: construction is completed, and traffic is restored;

[0047] Step nine: close the traffic, chisel out the damaged asphalt concrete pavement layer 3 above the joint in the later stage of the creep of new bridge box girder 16;

[0048] Step ten: pour concrete 17 in the adjacent zinc-containing steel plate 6;

[0049] Step eleven: re-pave the asphalt concrete pavement layer 3 at the position chiseled out in step nine, and cut the joint and fill the asphalt horseshoe fat 5 again according to step seven;

[0050] Step twelve: construction is completed, and traffic is restored.

[0051] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A new and old bridge widening structure for improving the influence of shrinkage creep difference, comprising left and right old bridge box girders (15) and new bridge box girders (16), characterized in that: At the widening place of the old bridge box girder (15) and the new bridge box girder (16), a widening asphalt concrete pavement (3), a zinc-containing steel plate (6), a waterproof roll material (7), a steel rib plate (11), a cork block (13) and a longitudinal steel plate (14) are arranged, the steel rib plate (11) is arranged below the flange plate of the old bridge box girder (15) and tightly presses the flange plate of the old bridge box girder (15); a plurality of longitudinal steel plates (14) are arranged at intervals along the longitudinal direction of the bridge, each longitudinal steel plate (14) is vertically placed and the left and right ends of each longitudinal steel plate (14) are respectively inserted into the flange plates of the old bridge box girder (15) and the new bridge box girder (16) and are welded with the stress reinforcement (12) in the corresponding box girder, the two ends of each longitudinal steel plate (14) are provided with grooves, and the cork block (13) is filled in the grooves at the two ends of the longitudinal steel plate (14); the zinc-containing steel plate (6) is vertically arranged between the two adjacent longitudinal steel plates (14), the front and rear ends of the zinc-containing steel plate (6) are welded to the middle portions of the two longitudinal steel plates (14), the upper portion of the zinc-containing steel plate (6) extends out of the top of the longitudinal steel plate (14), and the left and right sides of the extending portion are provided with the waterproof roll material (7), the widening asphalt concrete pavement (3) is arranged on the top of the waterproof roll material (7) and the zinc-containing steel plate (6), a longitudinal cutting seam is arranged at the central position of the left and right sides of the surface of the widening asphalt concrete pavement (3), the depth of the cutting seam is half of the thickness of the widening asphalt concrete pavement (3), and the cutting seam is filled with asphalt horse hoof fat (5), and the width of the longitudinal steel plate (14), the width of the waterproof roll material (7) and the width of the widening asphalt concrete pavement (3) are stepped and increased.

2. The new and old bridge widening structure improving the influence of shrinkage creep difference according to claim 1, characterized in that: The steel rib plate (11) is fixedly connected with the old bridge box girder (15) through high-strength bolts (10).

3. The new and old bridge widening structure improving the influence of shrinkage creep difference according to claim 2, characterized in that: Each of the steel rib plates (11) is provided with a group of high-strength bolts (10) on the front and rear sides, each group of high-strength bolts (10) is provided with 3-5 high-strength bolts, and the high-strength bolts are arranged at intervals.

4. The new and old bridge widening structure improving the influence of shrinkage creep difference according to claim 1, characterized in that: The top of the waterproof roll material (7) is flush with the top of the zinc-containing steel plate (6), and the bottom of the zinc-containing steel plate (6) is flush with the bottom of the longitudinal steel plate (14).

5. The new and old bridge widening structure improving the influence of shrinkage creep difference according to claim 2, characterized in that: An asphalt felt waterproof layer (4) is arranged above the waterproof roll material (7) and the zinc-containing steel plate (6).

6. The new and old bridge widening structure improving the influence of shrinkage creep difference according to claim 1, characterized in that: The longitudinal steel plate (14) is provided with a welding plate (18) at the two ends, and the longitudinal steel plate (14) is welded with the stress reinforcement (12) through the welding plate (18) to increase the welding area.

Images