Left and right part separation type existing bridge widening structure

Abstract

The utility model relates to a left-right separated existing bridge widening structure, which is characterized in that a UHPC cast-in-place belt and two pieces of combined book end profile steel are arranged at the widening position between a left bridge flange plate and a right bridge flange plate, and the two pieces of combined book end profile steel are respectively mounted at the ends of the left bridge flange plate and the right bridge flange plate and are symmetrically connected back to back; the UHPC cast-in-place belt is poured at the width splicing position and filled between the two pieces of combined book end profile steel, the whole UHPC cast-in-place belt is in a T shape, and the two ends of the UHPC cast-in-place belt are connected with the left side concrete leveling layer and the right side concrete leveling layer respectively. The corresponding combined book end section steel is arranged below the bridge flange plates on the left side and the right side to conduct transverse stiffening framework connection, the overall bending and shearing resistance rigidity of the widened structure is enhanced, and the UHPC integrally in a T shape is poured between the two corresponding combined book end section steel to enhance the overall strength.

Description

Technical Field

[0001] This utility model relates to the field of bridge engineering technology, specifically to a left-right split-type existing bridge widening structure and its construction method. Background Technology

[0002] With the rapid expansion of traffic flow on highway bridges, the capacity of existing roads is gradually becoming insufficient to meet the increasing traffic demand. Upgrading and expanding existing highways demonstrates significant advantages in controlling investment costs and shortening construction cycles, making it a major strategy for widening and renovating highways. By widening and reinforcing existing bridges, not only can their safety and stability be ensured, but the original bridge structure can also be utilized efficiently, maximizing its economic value.

[0003] Currently, the existing bridge widening structure with separate left and right spans cannot effectively connect the existing bridges on both sides, thus reducing longitudinal cracks and pavement damage on both sides. Utility Model Content

[0004] In view of the defects of the existing technology, the technical problem to be solved by this utility model is to provide a left and right split-type existing bridge widening structure and its construction method, which can ensure the intact connection of the left and right existing bridges and avoid longitudinal cracks and pavement layer damage on the left and right existing bridge surfaces.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a left-right separated bridge widening structure, including a left bridge flange plate and a right bridge flange plate. A UHPC cast-in-place strip and two combined book-clamp steel sections are provided at the widening point between the left and right bridge flange plates. The two combined book-clamp steel sections are respectively installed at the ends of the left and right bridge flange plates and are connected symmetrically in opposite directions. The combined book-clamp steel section includes an upper steel plate, vertical high-strength bolts, and a lower steel section. The upper steel plate is a U-shaped clamp plate formed by bending steel plate to match the contour of the end of the beam flange plate. The lower steel section is installed at the bottom of the upper steel plate. Several vertical high-strength bolts pass through the upper steel plate and the lower steel section to fix it to the corresponding beam flange plate. The UHPC cast-in-place strip is cast at the widening point and fills the middle of the two combined book-clamp steel sections, forming an overall "T" shape. The two ends of the UHPC cast-in-place strip are respectively connected to the left and right concrete leveling layers.

[0006] Preferably, the upper steel plate includes an upper horizontal section, a middle vertical section, and a lower inclination. The two upper steel plates are connected by transverse high-strength bolts passing through the middle vertical section. The two lower steel sections are welded together at their ends, and weld stiffening ribs are added at the welded positions to improve the connection strength.

[0007] Preferably, the upper steel plate is provided with vertical reinforcing ribs, and the top of the vertical reinforcing ribs is provided with top weld stiffening ribs to ensure that the downward inclination of the upper steel plate is stable and not easily deformed.

[0008] Preferably, each of the combined book clip steel sections is provided with a set of vertical high-strength bolts on both the front and rear sides, and each set of vertical high-strength bolts includes 4 to 8 bolts, which are evenly spaced on the left and right sides to ensure balanced stress distribution.

[0009] Preferably, the upper steel plate is fixedly connected to the beam flange plate by T-shaped anti-detachment studs welded to the top, and the T-shaped anti-detachment studs are cast into the UHPC cast-in-place strip.

[0010] Preferably, the T-shaped anti-loosening bolt is disposed between adjacent vertical high-strength bolts.

[0011] Preferably, the transverse high-strength bolts are provided in two parts, one above the other, and are through-through high-strength bolts.

[0012] A method for widening an existing bridge with separate left and right lanes, employing the aforementioned widening structure for the existing bridge with separate left and right lanes, comprises the following steps:

[0013] Step 1: Close the adjacent lanes of the old bridge on the left and right sides, remove the guardrails, and chisel open the original concrete pavement layer on the corresponding side of the old bridge to expose the top of the bridge flange plates on both sides of the old bridge.

[0014] Step 2: Drill through holes for vertical high-strength bolts on the left and right bridge flange plates, and also drill corresponding through holes for vertical high-strength bolts on the combined book clip steel.

[0015] Step 3: Install the combined book clip steel. Align the combined book clip steel with the holes on the corresponding side of the bridge flange plate and fix it with vertical high-strength bolts. Connect the book clip steel on both sides with horizontal high-strength bolts. Finally, install the bottom weld stiffening ribs.

[0016] Step 4: Pour UHPC between the left and right concrete leveling layers. The UHPC can flow into the space between the two combined book clip steel sections in a T shape. Smooth the surface of the UHPC to form a UHPC cast-in-place strip. The two ends of the UHPC cast-in-place strip are connected to and flush with the left and right concrete leveling layers, respectively.

[0017] Step 5: Pour concrete above the UHPC cast-in-place strip and smooth it to form the asphalt concrete surface layer at the splicing point. The asphalt concrete surface layer at the splicing point is connected to the asphalt concrete surface layer of the old bridge on the left and the asphalt concrete surface layer of the old bridge on the right.

[0018] Step Six: After the concrete has hardened, construction is complete, and traffic is restored.

[0019] Preferably, in step three, after the combined book clip steel is installed, T-shaped anti-loosening studs are welded to the top of the upper steel plate. The T-shaped anti-loosening studs are then cast into the UHPC cast-in-place strip in step four to improve the connection strength.

[0020] Preferably, in step two, the holes drilled on the left and right bridge flanges are staggered from the positions of the transverse prestressed steel bars of the beam flanges.

[0021] The beneficial effects of this utility model are:

[0022] 1) By setting corresponding combined book clip steel sections under the bridge flange plates on the left and right sides to connect the transverse stiffening skeleton, the overall bending and shear stiffness of the structure after the widening is enhanced, and a UHPC in the shape of "T" is poured between the two corresponding combined book clip steel sections to enhance the overall strength.

[0023] 2) The two sides of the bridge are connected by a combination of book clip-shaped steel to form a common load-bearing whole by connecting the cantilever ends of the adjacent flange plates of the existing bridge on both sides. This can effectively provide the overall rigidity of the bridge structure after widening, avoid longitudinal cracks in the existing bridge deck and damage to the pavement layer, and have a good widening effect, improving the durability of the structure and driving comfort.

[0024] 3) UHPC is cast above the bridge flange plate, which enhances the load-bearing capacity and durability of the structure compared with ordinary concrete, and improves its toughness, making it less prone to cracking when subjected to impact or stress. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the utility model;

[0026] Figure 2 This is a structural schematic diagram of a combined book clip steel frame;

[0027] In the diagram: 1-Left side old bridge asphalt concrete surface layer, 2-Left side concrete leveling layer, 3-Asphalt concrete surface layer at the widening section, 4-T-shaped anti-loosening bolt, 5-UHPC cast-in-place strip, 6-Right side concrete leveling layer, 7-Right side old bridge asphalt concrete surface layer, 8-Left side bridge flange plate, 9-Combined book clip steel, 901-Upper steel plate, 902-High-strength bolt, 903-Lower steel, 904-Top weld stiffening rib, 905-Bottom connecting stiffening rib, 906-Transverse high-strength bolt, 10-Right side bridge flange plate. Detailed Implementation

[0028] To better understand the improvements made by this utility model compared to the prior art, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0029] like Figure 1 As shown, a split-type existing bridge widening structure mainly consists of a left bridge flange plate 8 and a right bridge flange plate 10. A UHPC cast-in-place strip 5 and two combined book-clamp steel sections 9 are provided at the widening point between the left bridge flange plate 8 and the right bridge flange plate 10. The two combined book-clamp steel sections 9 are respectively installed at the ends of the left bridge flange plate 8 and the right bridge flange plate 10 and are connected symmetrically in opposite directions.

[0030] The combined book clip steel section 9 mainly consists of an upper steel plate 901, vertical high-strength bolts 902, and a lower steel section 903. The lower steel section 903 is installed at the bottom of the upper steel plate 901. The upper steel plate 901 is a U-shaped clamping plate made of steel plate bent to match the contour of the end of the beam flange plate. The U-shaped clamping plate consists of an upper horizontal section, a middle vertical section, and a downward slope. To ensure the downward slope of the upper steel plate 901 and avoid deformation, vertical reinforcing ribs are provided inside the upper steel plate 901, and the top of the vertical reinforcing ribs is provided with a top weld stiffening rib 904.

[0031] When installing the combined book clip steel profile 9, several vertical high-strength bolts 902 penetrate the upper steel plate 901 and the lower steel profile 903, fixing them to the corresponding beam flange plates. To ensure balanced stress, each group of vertical high-strength bolts 902 is evenly spaced 4 to 8 on the left and right sides. Simultaneously, to strengthen the connection between the upper steel plate 901 and the beam flange plates, the upper steel plate 901 is reinforced and fixed to the beam flange plates by T-shaped anti-loosening studs 4 welded to the top. The T-shaped anti-loosening studs 4 are positioned between adjacent vertical high-strength bolts 902. The two corresponding combined book clip steel profiles 9, after installation with the beam flange plates, are connected by horizontal high-strength bolts 906 passing through the middle vertical section on the two upper steel plates 901. There are two horizontal high-strength bolts 906, one above the other, both through-bolts, which are welded together at the ends of the two lower steel profiles 903. A weld stiffening rib 905 is added at the weld position to strengthen the connection between the two combined book clip steel profiles 9.

[0032] The UHPC cast-in-place strip 5 is cast at the splicing point and fills the space between the two combined book clip steel sections 9, forming an overall "T" shape. The two ends of the UHPC cast-in-place strip 5 are connected to the left concrete leveling layer 2 and the right concrete leveling layer 6, respectively, and the T-shaped anti-detachment bolts 4 are cast into the UHPC cast-in-place strip 5.

[0033] A method for widening an existing bridge with separate left and right spans, employing a separate left and right span structure, includes the following steps:

[0034] Step 1: Close the adjacent lanes of the old bridge on the left and right sides, remove the guardrails, and chisel open the original concrete pavement layer on the corresponding side of the old bridge to expose the top of the bridge flange plates on both sides of the old bridge.

[0035] Step 2: Drill through holes for vertical high-strength bolts 902 on the left bridge flange plate 8 and the right bridge flange plate 10, and also drill corresponding through holes for vertical high-strength bolts 902 on the combined book clip steel 9. The through holes drilled on the left bridge flange plate 8 and the right bridge flange plate 10 are staggered from the positions of the transverse prestressed steel bars of the beam flange plates.

[0036] Step 3: Install the combined book clip steel section 9. Align the combined book clip steel section 9 with the corresponding holes in the bridge flange plate and fix it with vertical high-strength bolts 902. Connect the book clip steel sections 9 on both sides with horizontal high-strength bolts 906. Finally, install the bottom weld stiffening ribs 905. After the combined book clip steel section 9 is installed, weld T-shaped anti-loosening bolts 4 to the top of the upper steel plate 901.

[0037] Step 4: Pour UHPC between the left concrete leveling layer 2 and the right concrete leveling layer 6. The UHPC should flow into the space between the two combined book-clamping steel sections 9 in a T-shape. Smooth the surface of the UHPC to form the UHPC cast-in-place strip 5. At the same time, pour the T-shaped anti-detachment studs 4 into the UHPC cast-in-place strip 5. The two ends of the UHPC cast-in-place strip 5 are connected to and flush with the left concrete leveling layer 2 and the right concrete leveling layer 6, respectively.

[0038] Step 5: Pour concrete above the UHPC cast-in-place strip 5 and smooth it to form the asphalt concrete surface layer 3 at the splicing point. The asphalt concrete surface layer 3 at the splicing point is connected to the asphalt concrete surface layer 1 of the old bridge on the left and the asphalt concrete surface layer 7 of the old bridge on the right.

[0039] Step Six: After the concrete has hardened, construction is complete, and traffic is restored.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A left-right separated bridge widening structure, comprising a left bridge flange plate (8) and a right bridge flange plate (10), characterized in that: A UHPC cast-in-place strip (5) and two combined book clip steel sections (9) are provided at the joint between the left bridge flange plate (8) and the right bridge flange plate (10). The two combined book clip steel sections (9) are respectively installed at the ends of the left bridge flange plate (8) and the right bridge flange plate (10) and are connected symmetrically in opposite directions. The combined book clip steel (9) includes an upper steel plate (901), vertical high-strength bolts (902), and a lower steel (903). The upper steel plate (901) is a U-shaped clamping plate made by bending steel plate and matching the contour of the end of the beam flange plate. The lower steel (903) is installed at the bottom of the upper steel plate (901). Several vertical high-strength bolts (902) pass through the upper steel plate (901) and the lower steel (903) to fix it to the corresponding beam flange plate. The upper steel plate (901) includes an upper horizontal section, a middle vertical section and a lower inclination. The two upper steel plates (901) are connected by a transverse high-strength bolt (906) passing through the middle vertical section. The transverse high-strength bolt (906) has two bolts, one above the other, and they are through-bolts. The two lower steel sections (903) are welded together at their ends and a weld stiffening rib (905) is added at the weld position. The upper steel plate (901) is fixedly connected to the beam flange plate by a T-shaped anti-detachment bolt (4) welded to the top, and the T-shaped anti-detachment bolt (4) is cast into the UHPC cast-in-place strip (5); The UHPC cast-in-place strip (5) is cast at the splicing point and fills the middle of the two combined book clip steel sections (9), forming a "T" shape. The two ends of the UHPC cast-in-place strip (5) are connected to the left concrete leveling layer (2) and the right concrete leveling layer (6) respectively.

2. The left and right span separated existing bridge widening structure according to claim 1, characterized in that: The upper steel plate (901) is provided with vertical reinforcing ribs, and the top of the vertical reinforcing ribs is provided with top weld stiffening ribs (904).

3. The left and right span separated existing bridge widening structure according to claim 1, characterized in that: Each of the combined book clip steel (9) is provided with a set of vertical high-strength bolts (902) on both the front and rear sides. Each set of vertical high-strength bolts (902) includes 4 to 8 bolts, which are evenly spaced on the left and right.

4. The left and right span separated existing bridge widening structure according to claim 1, characterized in that: The T-shaped anti-loosening bolt (4) is positioned between adjacent vertical high-strength bolts (902).

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