Integrated reinforcement structure and construction method for single-column pier bridge

Abstract

The present invention relates to an integrated reinforcement structure for a single-column pier bridge, comprising a foundation reinforcement system, a column reinforcement system, and an anti-seismic and anti-overturning reinforcement system. The foundation reinforcement system comprises a bottom steel hoop and steel pipe piles, the column reinforcement system comprises a reinforced concrete layer, a middle steel hoop, steel strands, and a top steel hoop, and the anti-seismic and anti-overturning reinforcement system comprises a damper, which is respectively connected to the bridge body and the top steel hoop via a hinged device. By reinforcing from bottom to top, the foundation, column, and pier head are formed into a whole, and the three reinforcements are interconnected, thereby improving the bearing capacity of the pier foundation and the shear, compression, and torsion resistance of the pier column, avoiding stress concentration at weak points of the bridge after single reinforcement and causing damage, thereby effectively improving the anti-seismic and anti-overturning capabilities of the bridge; the steel strands are tensioned around the strands and concrete is sprayed on the surface to form a hoop effect, thereby improving the shear, compression, and torsion resistance of the column.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge reinforcement, and in particular to an integrated reinforcement structure for a single-pillar pier bridge for improving the earthquake resistance and anti-overturning capability of the bridge and a construction method thereof. Background Art

[0002] At present, the main methods for anti-overturning reinforcement of single-column pier bridges are adding a cap beam method, adding anti-pullout constraints, adding auxiliary piers and strengthening piers. These methods all reinforce a certain part of the single-column pier bridge and fail to reinforce the bridge as a whole. Therefore, the effect of overall reinforcement of a single bridge pier is definitely greater than reinforcing a single part. In addition, the current reinforcement form rarely considers the impact of dynamic loads such as earthquakes on single-column pier bridges. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: in order to solve the problem of insufficient seismic and anti-overturning capacity of bridges in the prior art, an integrated reinforcement structure and a construction method for a single-column pier bridge are provided.

[0004] The technical solution adopted by the present invention is: an integrated reinforcement structure for a single-column pier bridge, including a foundation reinforcement system, a column reinforcement system and an anti-seismic and anti-overturning reinforcement system.

[0005] The foundation reinforcement system includes a bottom steel hoop and a steel pipe pile. The bottom steel hoop is tightly clamped on the bottom of the single-column pier body. The steel pipe pile passes through the bottom steel hoop and is implanted into the soil under the single-column pier body, so that the bottom steel hoop and the single-column pier body form a whole.

[0006] The column reinforcement system includes a reinforced concrete layer, a middle steel hoop, steel strands and a top steel hoop. The middle steel hoop and the top steel hoop are respectively tightly clamped at the middle and top of the single column pier body. The steel strands are hooped outside the single column pier body. Concrete is sprayed outside the single column pier body and forms a reinforced concrete layer on the outer surface of the single column pier body with the steel strands, thereby reinforcing the column structure.

[0007] The anti-seismic and anti-overturning reinforcement system comprises a damper, which is respectively connected to the bridge body and the top steel hoop through a hinge device.

[0008] Furthermore, the bottom steel hoop, the middle steel hoop and the top steel hoop all adopt a split structure connected as one by high-strength bolts.

[0009] The bottom steel hoop, the middle steel hoop and the top steel hoop all include a hoop body, an extension plate, stiffening ribs and ears. The hoop body adopts an annular structure that fits the main body of the single-column pier. The extension plate is perpendicular to the hoop body and extends evenly outward from one end of the hoop body. The stiffening ribs are connected to the hoop body and the extension plate, and the ears are arranged at the connection of the split structure.

[0010] Furthermore, a steel plate is welded on the hinged device to provide anchor bolts for anchoring with the lower end face of the bridge body and the upper end face of the top steel hoop.

[0011] The dampers include two groups symmetrically arranged on the left and right sides of the single-column pier body. Each group of dampers includes two symmetrically arranged dampers. One end of the two dampers is hinged to the hinge device located on the top steel hoop, and the other end is hinged to the hinge device located on the lower end surface of the bridge body.

[0012] Specifically, the number, position and model of the dampers are determined according to design requirements.

[0013] Furthermore, the extension plates are respectively located at the lower ends of the bottom steel hoop, the middle steel hoop and the upper end of the top steel hoop.

[0014] Furthermore, the lugs are provided with screw holes for high-strength bolts to pass through.

[0015] The extension plate of the bottom steel hoop is provided with reserved holes for steel pipe piles to pass through.

[0016] The reinforcing ribs of the bottom steel hoop and the top steel hoop and the extension plate of the middle steel hoop are provided with reserved holes for steel strands to pass through.

[0017] Furthermore, a rubber sheet is provided between the inner wall of the hoop body and the outer surface of the single column pier body.

[0018] The hoop body of the middle steel hoop is flush with the outer surface of the reinforced concrete layer.

[0019] Furthermore, the hinge device adopts a universal joint or a ball joint, and the universal joint is used to connect two dampers at the same time.

[0020] The universal hinge comprises a limit plate and a hinged part welded on a steel plate. The hinged part adopts a V-shaped structure, with a damper hinged at each end of the top and a pin fixed at the bottom for rotationally connecting with the limit plate.

[0021] Furthermore, the steel strands are provided with four strands evenly wrapped around the main body of the single column pier.

[0022] The construction method of the above-mentioned reinforcement structure comprises the following steps:

[0023] Step 1: Level the site: clean and level the bottom of the single-column pier, install the bottom steel hoop and implant the prefabricated steel pipe piles;

[0024] Step 2: Set up the construction platform: Install the temporary support, lift the top steel casing to the predetermined position, tighten it to the outside of the single column pier with high-strength bolts, and fix one end of the steel strand. Then lift the middle steel hoop to the predetermined position and tighten it.

[0025] Step 3: Tensioning the steel strand: The steel strand is tensioned by an electric traction machine, and the steel strand passes through the reserved holes for the steel strand of the middle steel hoop and the bottom steel hoop, and then tensioning is carried out;

[0026] Step 4: Spraying concrete: After the steel strands are tensioned, spray concrete onto the surface of the pier until it is flush with the outer surface of the central steel hoop to form a reinforced concrete layer, thereby integrating the steel strands with the pier.

[0027] Step 5: Positioning: Install the steel plate welded to the hinged device on the lower end face of the bridge body, and then connect the damper between the bridge body and the top steel casing by hinged connection;

[0028] Step 6. Inspection: After the construction of the integrated reinforcement structure of the single-column pier bridge is completed, inspection will be carried out. After the inspection is qualified, the temporary support will be removed.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. Through bottom-up reinforcement, the foundation, column, and pier head are formed into an integrated whole, and the reinforcement of these three parts is interconnected, which improves the bearing capacity of the pier foundation and the shear, compression, and torsion resistance of the pier column. This avoids stress concentration in weak parts of the bridge after single reinforcement, thereby effectively improving the bridge's earthquake resistance and anti-overturning capacity;

[0031] 2. The bridge's overturning capacity continues to increase during construction without interrupting bridge traffic;

[0032] 3. The damper itself has the function of absorbing energy and reducing shock, thereby improving the seismic resistance of the bridge;

[0033] 4. The steel strands are tensioned around the strands and concrete is sprayed on the surface to form a hoop effect, thereby improving the shear, compression and torsion resistance of the column.

[0034] 5. Steel hoops, steel strands and steel pipe piles can effectively improve the bearing capacity of the bridge;

[0035] 6. The reinforcement device is manufactured in the factory to achieve rapid construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a structural schematic diagram of the present invention;

[0037] Figure 2 This is a schematic elevation view of the top steel hoop of the present invention;

[0038] Figure 3 This is a schematic elevation view of the middle steel hoop of the present invention;

[0039] Figure 4 This is a schematic elevation view of the bottom steel hoop of the present invention;

[0040] Figure 5 This is a schematic diagram of the column reinforcement facade of the present invention;

[0041] Figure 6 It is a structural schematic diagram of the hinge device in the anti-seismic and anti-overturning system of the present invention;

[0042] Figure 7 It is a structural schematic diagram of the universal joint of the present invention.

[0043] Numbers in the figure: 1-single-column pier body, 2-bottom steel hoop, 3-reserved holes for steel strands, 4-reinforced concrete layer, 5-middle steel hoop, 6-steel strands, 7-damper, 8-hinge device, 9-top steel hoop, 10-anchor bolts, 11-steel plate, 13-high-strength bolts, 14-reserved holes for steel pipe piles, 15-steel pipe piles, 16-bridge body, 17-hoop body, 18-extension plate, 19-stiffening ribs, 20-ears, 81-limiting plate, 82-hinge, 83-pin. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below. The embodiments are implemented based on the technical solutions of the present invention, and detailed implementation methods and specific operating processes are given. However, the protection scope of the present invention is not limited to the following embodiments.

[0045] Figure 1-Figure 7 The single-column pier bridge integrated reinforcement structure shown in the figure includes a foundation reinforcement system, a column reinforcement system and an anti-seismic and anti-overturning reinforcement system.

[0046] The foundation reinforcement system includes a bottom steel hoop 2 and a steel pipe pile 15. The bottom steel hoop 2 is tightly clamped on the bottom of the single-column pier body 1. The steel pipe pile 15 passes through the bottom steel hoop 2 and is implanted into the soil under the single-column pier body 1, so that the bottom steel hoop 2 and the single-column pier body 1 form a whole.

[0047] The column reinforcement system includes a reinforced concrete layer 4, a middle steel hoop 5, a steel strand 6 and a top steel hoop 9. The middle steel hoop 5 and the top steel hoop 9 are respectively tightly clamped on the middle and top of the single column pier body 1. The steel strand 6 is hooped outside the single column pier body 1. Concrete is sprayed outside the single column pier body 1 and forms a reinforced concrete layer 4 on the outer surface of the single column pier body 1 with the steel strand 6, thereby reinforcing the column structure.

[0048] The anti-seismic and anti-overturning reinforcement system includes a damper 7, which is connected to the bridge body 16 and the top steel hoop 9 through a hinge device 8 respectively.

[0049] The bottom steel hoop 2, the middle steel hoop 5 and the top steel hoop 9 are all split structures connected together by high-strength bolts 13.

[0050] The bottom steel hoop 2, the middle steel hoop 5 and the top steel hoop 9 all include a hoop body 17, an extension plate 18, stiffening ribs 19 and ears 20. The hoop body 17 adopts an annular structure that fits the single-column pier body 1. The extension plate 18 is perpendicular to the hoop body 17 and extends evenly outward from one end of the hoop body 17. The stiffening ribs 19 are connected to the hoop body 17 and the extension plate 18. The ears 20 are arranged at the connection of the split structure.

[0051] The hinge device 8 is welded with a steel plate 11 for anchoring the anchor bolt 10 to the lower end surface of the bridge body 16 and the upper end surface of the top steel hoop 9.

[0052] The hinge device 8 adopts a universal hinge or a ball hinge. The universal hinge is used to connect two dampers 7 at the same time. The universal hinge includes a limit plate 81 welded on the steel plate 11 and a hinge 82. The hinge 82 adopts a V-shaped structure. The top two ends are respectively hinged with a damper 7, and the bottom is fixed with a pin 83 that is rotatably connected to the limit plate 81.

[0053] The damper 7 includes two groups symmetrically arranged on the left and right sides of the single-column pier body 1. Each group of dampers 7 includes two symmetrically arranged dampers 7. One end of the two dampers 7 is hinged to the universal hinge located on the top steel hoop 9, and the other end is hinged to the ball joint located on the lower end surface of the bridge body 16.

[0054] The extension plates 18 are respectively located at the lower ends of the bottom steel hoop 2 , the middle steel hoop 5 and the upper end of the top steel hoop 9 .

[0055] The lugs 20 are provided with screw holes for the high-strength bolts 13 to pass through.

[0056] The extension plate 18 of the bottom steel hoop 2 is provided with a reserved hole 14 for the steel pipe pile 15 to pass through.

[0057] The reinforcing ribs 19 of the bottom steel hoop 2 and the top steel hoop 9 and the extension plate 18 of the middle steel hoop 5 are provided with reserved holes 3 for the steel strands 6 to pass through.

[0058] A rubber sheet is provided between the inner wall of the hoop body 17 and the outer surface of the single column pier body 1.

[0059] The hoop body 17 of the middle steel hoop 5 is flush with the outer surface of the reinforced concrete layer 4 .

[0060] Four steel strands 6 are evenly arranged around the single column pier body 1 .

[0061] The construction method of the integrated reinforcement structure of a single-pillar pier bridge includes the following steps:

[0062] Step 1: Level the site: clean and level the bottom of the single-column pier body 1, install the bottom steel hoop 2 and implant the prefabricated steel pipe pile 15;

[0063] Step 2: Set up the construction platform: Install the temporary support, lift the top steel hoop 9 to the predetermined position, tighten it to the outside of the single column pier body 1 with high-strength bolts 13, and fix one end of the steel strand 6, then lift the middle steel hoop 5 to the predetermined position and tighten it;

[0064] Step 3: Tensioning the steel strand: The steel strand 6 is tensioned by an electric traction machine, and the steel strand 6 passes through the steel strand reserved holes 3 of the middle steel hoop 5 and the bottom steel hoop 2, and then tensioning is performed;

[0065] Step 4: Spraying concrete: After the steel strands 6 are tensioned, spray concrete onto the surface of the pier body 1 until it is flush with the outer surface of the hoop body 17 of the central steel hoop 5 to form a reinforced concrete layer 4, thereby integrating the steel strands 6 with the pier body 1.

[0066] Step 5: Positioning: Install the steel plate 11 welded to the hinge device 8 on the lower end surface of the bridge body 16, and then connect the damper 7 between the bridge body 16 and the top steel hoop 9 by hinged connection;

[0067] Step 6. Inspection: After the construction of the integrated reinforcement structure of the single-column pier bridge is completed, inspection will be carried out. After the inspection is qualified, the temporary support will be removed.

Claims

1. An integrated reinforcement structure for a single-column pier bridge, characterized in that: Including foundation reinforcement system, column reinforcement system and seismic and anti-overturning reinforcement system, The foundation reinforcement system comprises a bottom steel hoop (2) and a steel pipe pile (15), wherein the bottom steel hoop (2) is tightly clamped on the bottom of the single-column pier body (1), and the steel pipe pile (15) passes through the bottom steel hoop (2) and is implanted into the soil under the single-column pier body (1). The column reinforcement system includes a reinforced concrete layer (4), a middle steel hoop (5), a steel strand (6) and a top steel hoop (9), wherein the middle steel hoop (5) and the top steel hoop (9) are respectively tightly clamped on the middle and top of the single column pier body (1), the steel strand (6) is hooped outside the single column pier body (1), and concrete is sprayed outside the single column pier body (1) to form a reinforced concrete layer (4) located on the outer surface of the single column pier body (1) together with the steel strand (6), and the steel strand (6) is provided with four strands uniformly surrounding the single column pier body (1); The anti-seismic and anti-overturning reinforcement system comprises a damper (7), which is connected to the bridge body (16) and the top steel hoop (9) respectively through a hinge device (8); The bottom steel hoop (2), the middle steel hoop (5) and the top steel hoop (9) all adopt a split structure connected as one by high-strength bolts (13). The bottom steel hoop (2), the middle steel hoop (5) and the top steel hoop (9) all include a hoop body (17), an extension plate (18), a stiffening rib (19) and a lug (20). The hoop body (17) adopts an annular structure that fits the single-column pier body (1). The extension plate (18) is perpendicular to the hoop body (17) and extends uniformly outward from one end of the hoop body (17). The stiffening rib (19) is connected to the hoop body (17) and the extension plate (18). The lug (20) is provided at the connection of the split structure. The reinforcing ribs (19) of the bottom steel hoop (2) and the top steel hoop (9) and the extension plate (18) of the middle steel hoop (5) are provided with steel strand holes (3) for allowing the steel strands (6) to pass through.

2. The reinforcement structure according to claim 1, characterized in that: The hinge device (8) is welded with a steel plate (11) for anchoring the anchor bolts (10) to the lower end surface of the bridge body (16) and the upper end surface of the top steel hoop (9). The dampers (7) include two groups symmetrically arranged on the left and right sides of the single-column pier body (1), and each group of dampers (7) includes two symmetrically arranged dampers (7). One end of the two dampers (7) is connected to the hinge device (8) located on the top steel hoop (9), and the other end is respectively connected to the hinge device (8) located on the lower end surface of the bridge body (16).

3. The reinforcement structure according to claim 2, characterized in that: The extension plates (18) are respectively located at the lower ends of the bottom steel hoop (2), the middle steel hoop (5), and the upper end of the top steel hoop (9).

4. The reinforcement structure according to claim 1, characterized in that: The holding ears (20) are provided with screw holes for allowing high-strength bolts (13) to pass through. The extension plate (18) of the bottom steel hoop (2) is provided with a steel pipe pile reserved hole (14) for accommodating the steel pipe pile (15) to pass through.

5. The reinforcement structure according to claim 1, characterized in that: A rubber sheet is provided between the inner wall of the hoop body (17) and the outer surface of the single column pier body (1). The hoop body (17) of the middle steel hoop (5) is flush with the outer surface of the reinforced concrete layer (4).

6. The reinforcement structure according to claim 1, characterized in that: The hinge device (8) adopts a universal joint or a ball joint, and the universal joint is used to connect two dampers (7) at the same time. The universal hinge comprises a limit plate (81) and a hinge (82) welded to a steel plate (11). The hinge (82) has a V-shaped structure, with a damper (7) hinged at each end of the top and a pin (83) fixed at the bottom for rotational connection with the limit plate (81).

7. The construction method of the reinforcement structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Leveling the site: Clean and level the bottom of the single-column pier body (1), install the bottom steel hoop (2) and implant the prefabricated steel pipe pile (15); Step 2: Set up a construction platform: Install a temporary support, lift the top steel hoop (9) to the predetermined position, tighten it to the outside of the single-column pier body (1) through high-strength bolts (13), and fix one end of the steel strand (6), then lift the middle steel hoop (5) to the predetermined position and tighten it; Step 3, tensioning the steel strand: tensioning the steel strand (6) by an electric traction machine, the steel strand (6) passes through the steel strand reserved holes (3) of the middle steel hoop (5) and the bottom steel hoop (2), and then tensioning is performed; Step 4, spraying concrete: after the steel strand (6) is tensioned, spray concrete on the surface of the single-column pier body (1) until it is flush with the outer surface of the hoop body (17) of the middle steel hoop (5) to form a reinforced concrete layer (4), thereby integrating the steel strand (6) and the single-column pier body (1); Step 5: Positioning: Install the steel plate (11) welded to the hinge device (8) on the lower end surface of the bridge body (16), and then connect the damper (7) between the bridge body (16) and the top steel hoop (9) by hinged connection; Step 6. Inspection: After the construction of the integrated reinforcement structure of the single-column pier bridge is completed, inspection will be carried out. After the inspection is qualified, the temporary support will be removed.

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