Construction method and auxiliary equipment for demolishing old bridge and building new rigid-frame bridge in situ

Abstract

The application provides a method for demolishing and constructing a new rigid frame bridge on the site of an old bridge and auxiliary equipment thereof, and comprises the following steps: constructing a road and a construction platform along a design direction, and connecting the road and the construction platform; the road is used for passing of construction vehicles, equipment and materials; a new bridge pier is constructed on a side of an old bridge deck according to a design scheme; a new bridge deck is constructed on the new bridge pier, which is a first new bridge deck; after the first new bridge deck is constructed, the old bridge deck is demolished in batches; according to a design requirement, the old bridge pier is reinforced and expanded, and the redundant bridge pier is demolished; a new bridge deck is constructed on the reinforced and expanded old bridge pier, which is a second new bridge deck; the road is demolished, and the first new bridge deck and the second new bridge deck are opened to traffic, and are lanes in different directions of the new bridge, respectively. The application solves the problem of traffic interruption in a traditional demolition and construction scheme, reduces the influence on regional traffic, and realizes cutting and accurate hoisting of the bridge pier by using special auxiliary equipment, so that the influence on surrounding facilities during demolition is smaller and safety is higher.

Description

Technical Field

[0001] This invention relates to the field of bridge demolition and reconstruction technology, specifically to the demolition and reconstruction method and auxiliary equipment for building a new rigid frame bridge on the same site after demolishing an old bridge. Background Technology

[0002] As my country's inland waterway transportation system continues to improve, the enhancement of its navigation capacity is of great significance to regional economic development. However, some existing bridges, due to their early construction, can no longer meet the current requirements for waterway upgrades, becoming "bottleneck" projects that restrict waterway traffic efficiency.

[0003] Against this backdrop, demolishing the old bridge and building a new one with the necessary navigation conditions has become an urgent priority.

[0004] The common approach is to build a new bridge and demolish the old one. However, this method requires a significant amount of time to demolish the old bridge and its piers, especially since demolishing a large number of piers is inconvenient. Furthermore, the connection between the new bridge and the existing roads needs to be replanned, which requires additional land, increases costs, and makes construction more difficult.

[0005] Another approach is to demolish the old bridge deck and some of the piers, then add new piers and superstructure, and finally construct a new bridge deck on the original site. This approach is less expensive, but the route will lose its traffic capacity during construction, which will have a serious impact on existing traffic. Furthermore, the existing methods for demolishing old bridges generally involve using the crushing method to remove the piers, which is not only inconvenient to operate but also affects surrounding facilities and has poor safety. Summary of the Invention

[0006] The main objective of this invention is to provide a method and auxiliary equipment for the demolition and reconstruction of old bridges into new rigid frame bridges on the same site, thereby solving the problems of low efficiency, inability to maintain traffic flow, and poor safety in the demolition and reconstruction of existing old bridges, which present significant construction difficulties.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: The demolition and reconstruction method for an old bridge and the construction of a new rigid frame bridge on the same site includes the following steps: S1. Construction access road and construction platform along the design direction, the access road and construction platform are connected; the access road is used for the passage of construction vehicles, equipment and materials; S2. Construct new bridge piers on the side of the old bridge deck according to the design plan; S3. Construction of a new bridge deck on the new bridge piers, which is the first new bridge deck; S4. After the first new bridge deck is completed, the old bridge deck will be demolished in batches. S5. Reinforce and expand the old bridge piers according to the design requirements, and remove the excess bridge piers. S6. Construct a new bridge deck on the reinforced and expanded old bridge piers, which is called the second new bridge deck; S7, the temporary road was demolished, and the first and second new bridge decks were opened to traffic, which are lanes for different directions of the new bridge.

[0008] In the preferred embodiment, the construction platform is located in the middle section of the old bridge; S1 includes: S11. Construction access road along the design direction; S12. A temporary iron trestle bridge shall be erected on the side of the design location of the construction platform and on the side of the old bridge. S13. The temporary iron trestle bridge connects to the old bridge deck; the temporary iron trestle bridge is used to maintain traffic flow during construction and does not affect the passage of other vehicles. S14. Demolish the old bridge deck at the designed location of the construction platform; S15. The construction platform has been completed and connected to the access road.

[0009] In the preferred embodiment, in S5: Auxiliary equipment was used to cut and demolish the piers of the old bridge that needed to be removed; the bridge was cut in an inverted V-shape during the cutting process, and after the cutting was completed, it was lifted by a crane to the garbage disposal point; The old bridge piers that need to be retained will be reinforced, and the superstructure will be installed. In S7, the connection between the first and second new bridge decks was reinforced, and a median guardrail was installed.

[0010] In the preferred embodiment, in S4, a road cutting machine is used to cut the old bridge deck asphalt pavement and hollow concrete slabs; Demolition proceeds from the outside in, first removing the side slabs of the hollow concrete slab, then the middle slab, and so on. Hoisting equipment is used to transport the hollow slabs in sections to the old bridge for crushing. When the old bridge deck was demolished, the first new bridge deck was opened to traffic.

[0011] In the preferred embodiment, the process of cutting off the bridge pier includes the following steps: S51. Use a crane to place the auxiliary equipment on the top middle section of the bridge pier to be demolished; S52, Auxiliary equipment clamps the bridge through a clamping structure; The crane arm extends a hoisting rope to connect to the removed middle section of the bridge; S53. The bridge is cut in an inverted V-shape using a cutting machine attached to an auxiliary device; S54. The crane lifts the middle section of the bridge and places it at the disposal point or on a transport vehicle for removal. S55. The crane boom lifts the auxiliary equipment to the side of the pier and clamps the pier on the side of the pier. The crane arm extends a hoisting rope to connect the remaining bridge above the pier to the top of the pier being cut. S56. Use the cutting machine attached to the auxiliary equipment to horizontally cut the pier; S57. The crane lifts the remaining bridge and cut piers and places them at the processing point or on a transport vehicle for removal. S58. Repeat S55-S57 until all bridge piers are removed.

[0012] An auxiliary device for a demolition and reconstruction method of an old bridge and a new rigid frame bridge in situ includes a connector, and diamond wire saws are provided on both sides of the connector. The bottom end of the connector is equipped with fasteners for clamping the bridge pier; The top of the connector is connected to the boom.

[0013] In a preferred embodiment, the connector includes a connector base; The connector is equipped with a connecting flange and a pull ring at the top; Connect the flange to the external connecting pipeline, and connect the pipeline to the external hydraulic control system; The pull ring is used to connect the second lifting rope; The first hydraulic cylinder is fixed to the side of the connecting seat near the diamond wire saw by a reinforcing plate; A second hydraulic cylinder is hinged to the side of the connecting seat near the diamond wire saw via a connecting plate; Diamond wire saws are equipped with mounting plates; Both the first and second hydraulic cylinders are hinged to the mounting plate via a connecting plate.

[0014] In the preferred embodiment, a connector for connecting the crane is also provided, and a guide wheel is provided inside the connector; It is also equipped with several first and second lifting ropes, which pass through the guide wheel and are connected to the boom and electric hoist. The first hoisting rope is used to connect the pier or beam being hoisted, and the second hoisting rope is used to connect the connecting parts.

[0015] In the preferred embodiment, the first and second hydraulic cylinders are arranged vertically. When the first and second hydraulic cylinders extend or retract to different lengths, the diamond wire saw rotates relative to the connecting seat. Two diamond wire saws rotate relative to each other, with their cutting ends close together, used for cutting bridge piers in a V-shape.

[0016] In a preferred embodiment, the fastener includes a plurality of clamping rods hinged to the connecting seat, the clamping rods being located on both sides of the connecting seat; A third hydraulic cylinder is provided between the middle of the clamping rod and the bottom of the connecting seat; the two ends of the third hydraulic cylinder are respectively hinged to the middle of the clamping rod and the bottom of the connecting seat. A clamping part is provided on the side of the bottom of the clamping rod near the connecting seat.

[0017] This invention provides a method for the demolition and reconstruction of an old bridge into a new rigid frame bridge on the same site, along with its auxiliary equipment. By adopting the above solution, the following beneficial effects can be achieved: By first constructing a temporary iron trestle bridge and the first new bridge deck as a passageway, and allowing normal traffic flow during the demolition of the old bridge deck and the construction of the second new bridge deck, the problem of traffic disruption caused by the traditional demolition and reconstruction plan is completely solved, and the impact on regional traffic is reduced.

[0018] Specialized auxiliary equipment is used to cut and precisely lift the bridge piers, which is more efficient than the traditional crushing method and has less impact on surrounding facilities and is safer.

[0019] In-situ reconstruction eliminates the need for additional road planning, simplifies the construction process, and shortens the overall construction period compared to traditional methods.

[0020] Reconstruction in situ does not require additional land, reducing land acquisition and demolition costs, and utilizing some of the old bridge piers further reduces construction costs.

[0021] The cutting angle and size of the auxiliary equipment can be adjusted according to the old bridge's structural form and pier size, making it more adaptable to different demolition needs. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure after the access road of the present invention is installed; Figure 2 This is a structural schematic diagram of the new bridge pier during construction of the present invention; Figure 3 This is a schematic diagram of the structure after the completion of the construction of the new bridge and the addition of a temporary access road in this invention. Figure 4 This is a structural diagram of the old bridge during the demolition of the present invention; Figure 5 This is a schematic diagram of the newly constructed bridge at the location where the old bridge was demolished, based on the present invention. Figure 6 This is a schematic diagram of the first embodiment of the present invention for maintaining traffic flow during the demolition of an old bridge; Figure 7 This is a schematic diagram of the second embodiment of the present invention for maintaining traffic flow during the demolition of an old bridge; Figure 8 This is a schematic diagram of the auxiliary equipment structure during the dismantling and reconstruction process of this invention; Figure 9 This is a front view of the auxiliary equipment used in the dismantling and assembly process of this invention; Figure 10 This is a schematic diagram of the structure of the auxiliary equipment for cutting old bridge pier beams according to the present invention; Figure 11 This is a schematic diagram of the structure of the auxiliary equipment of the present invention during the cutting of old bridge piers.

[0023] In the picture: Old bridge deck 1, old bridge pier 101, temporary road 2, construction platform 201, new bridge pier 301, first new bridge deck 302, second new bridge deck 303, pier body 401, beam body 402, connector 5, connecting seat 501, connecting flange 502, first hydraulic cylinder 503, reinforcing plate 504, second hydraulic cylinder 505, mounting plate 506, connecting plate 507, pull ring 508, diamond wire saw 6, fastener 7, clamping rod 701, connecting block 702, third hydraulic cylinder 703, clamping part 704, connector 801, connecting pipeline 802, first lifting rope 803, second lifting rope 804, temporary iron trestle bridge 9. Detailed Implementation

[0024] Example 1: like Figure 1 , 2 As shown in Figures 3, 4, 5, 6, and 7, the demolition and reconstruction method for an old bridge to be demolished and a new rigid frame bridge built on the same site includes the following steps: S1: Construction access road 2 and construction platform 201 are connected along the design direction. S11: According to the construction plan and traffic diversion scheme, temporary access road 2 will be constructed along the side of the new bridge's design route. Temporary access road 2 will be lower than the old bridge deck, allowing passage under the old bridge. Crash barriers will be installed on both sides of temporary access road 2. Temporary access road 2 will be constructed simultaneously on both banks. The completed temporary access road will be as follows: Figure 1 , 2 As shown in Figure 3, the access road 2 is set along the edges of the new bridge and the old bridge to facilitate the construction of the new bridge and the demolition of the old bridge.

[0025] Access Road 2 avoids the critical structure of the old bridge, ensuring smooth passage for construction vehicles, equipment, and materials, while not affecting the temporary maintenance of the old bridge.

[0026] S12: A temporary iron trestle bridge 9 will be erected on the side of the construction platform 201 at the designed location. The temporary iron trestle bridge 9 is located on the side of the old bridge and is on the same plane as the old bridge deck 1. The temporary iron trestle bridge 9 is constructed with Q355B steel, the main truss is I40a I-beam, the bridge deck is 10mm thick anti-slip steel plate, the width is 4-6m, and the design load level is Highway-II to meet the needs of social vehicle traffic. The two ends of the temporary iron trestle bridge 9 are connected to the existing roads on both sides of the old bridge to ensure normal passage of social vehicles during construction.

[0027] S13: The temporary iron trestle bridge 9 is connected to the edge of the old bridge deck 1 by welding steel plates. A transition steel plate is set at the connection to avoid bumps when vehicles pass through. The temporary iron trestle bridge 9 serves as a traffic control passage during construction and is maintained by dedicated personnel 24 hours a day to ensure traffic order.

[0028] S14: Use a road cutting machine to cut the old bridge deck 1 at the design location of construction platform 201. The cutting depth is preferably 300mm. The cutting outline size is determined according to the requirements of the construction platform, preferably 10m×8m. Then, use a hydraulic breaker to break the cut bridge deck pieces and use a truck crane to lift the broken pieces to the designated spoil disposal site.

[0029] S15: Construction platform 201 is located in the middle section of the old bridge. It is constructed using reinforced concrete or a combination of steel beams and plates. The top of construction platform 201 is fitted with anti-slip patterned steel plates, and protective railings are installed around its perimeter. After construction, construction platform 201 is connected to access road 2 via a concrete ramp or steel plate, forming a complete construction transport channel. Construction equipment enters construction platform 201 via access road 2. Construction platform 201 is used for large construction equipment, while access road 2 meets the needs of conventional construction equipment such as truck cranes, jib cranes, and hydraulic systems.

[0030] The sidewalk can be removed later, or it can be reinforced and connected to the new bridge, with guardrails installed, to serve as a non-motorized vehicle lane.

[0031] S2: Construct new bridge pier 301 on one side of the old bridge deck according to the design plan. According to the design drawings of the new bridge, the construction of the new pier 301 will be carried out on the side of the old bridge deck 1. The new pier 301 and the temporary iron trestle bridge 9 are located on both sides of the old bridge. The new pier 301 adopts a pile foundation + abutment + pier structure. The pile foundation is a bored cast-in-place pile, which is drilled by a rotary drilling rig and poured with C35 concrete underwater. The abutment is a rectangular structure and is poured with C40 concrete. The pier has a circular cross section and is poured with C40 reinforced concrete. During the construction, the verticality of the pier is controlled by a total station, and the deviation is ≤1%. After the construction of the new pier 301 is completed, it will be cured to 100% of the design strength.

[0032] The construction of the new bridge pier 301 will not affect the traffic flow of the old bridge. The construction sequence of access road 2 and new bridge pier 301 can be adjusted as needed, or they can be constructed simultaneously.

[0033] S3: Construction of a new bridge deck on new pier 301, designated as the first new bridge deck 302: After the curing of new pier 301 is completed, construction of the first new bridge deck 302 will begin. The first new bridge deck 302 is a rigid frame bridge deck, using a prestressed concrete structure. The bridge deck width is preferably 10-12m, and the span is determined according to the waterway requirements, preferably 20-30m. The construction process includes: scaffolding erection, using cup-lock scaffolding; formwork installation, preferably steel formwork, with a flatness deviation ≤2mm / m; rebar binding, using Φs15.2 steel strands for prestressed steel bars, with a tension control stress of 1395MPa; concrete pouring, preferably using C50 prestressed concrete, using pump pouring; compaction by vibration; prestressing tensioning and grouting, with the tensioning sequence being longitudinal first and then transverse; after the construction of the first new bridge deck 302 is completed, it will be cured to more than 80% of the design strength and ready for traffic.

[0034] The two ends of the first new bridge deck 302 are connected to the existing roads at both ends of the old bridge for future traffic.

[0035] S4: After the completion of the first new bridge deck 302 construction, the old bridge deck 1 will be demolished in batches: The first new bridge deck 302 is open to traffic and social vehicles can pass through the first new bridge deck 302. The old bridge deck 1 will be demolished in batches. The asphalt pavement and hollow concrete slabs of the old bridge deck 1 were cut using a road cutting machine, preferably into 2m×3m slabs for easy lifting. The demolition sequence proceeded from the outside to the inside, first removing the side slabs of the hollow concrete slabs, then the middle slabs, and so on. Then, a truck crane was used to lift the cut hollow slabs into sections to a designated area under the old bridge, where they were crushed by a hydraulic breaker. Finally, the crushed concrete waste was transported to a waste disposal site for recycling. During the demolition process, safety warning signs were set up, and a dedicated person was assigned to direct the operation to prevent waste from falling and injuring people.

[0036] During demolition, the cutting and demolition are carried out sequentially from the position closest to the construction platform 201 to the position furthest away from the construction platform 201.

[0037] S5: According to design requirements, reinforce and expand the old bridge pier 101, and demolish the redundant old bridge pier 101. The old bridge pier 101 that needs to be retained will be reinforced: First, the weathered layer and damaged concrete on the surface of the old bridge pier 101 will be removed to expose the solid base layer; then, reinforcing steel mesh will be tied to the surface of the bridge pier, formwork will be installed, and C40 shotcrete will be poured to enhance the load-bearing capacity of the bridge pier; and according to the design requirements of the new bridge, the superstructure will be added to the top of the reinforced old bridge pier 101, and a pier cap will be poured to provide support for the construction of the second new bridge deck 303.

[0038] The excess old bridge pier 101 was cut and dismantled using auxiliary equipment to eliminate its impact on navigation below. The specific steps are as follows: S51: Preferably, the auxiliary equipment is lifted by the boom of a truck crane to the top middle section of the beam 402 of the pier to be demolished and placed there, ensuring that the auxiliary equipment is placed stably. S52: The fastener 7 of the operating auxiliary equipment clamps the beam 402 through the clamping part 704 to ensure a firm clamping; the boom releases the first lifting rope 803, which is connected to the middle section of the cut beam 402 through the connector 801. The first lifting rope 803 is pre-tightened to bear the weight of the beam. Manual assistance is required to fix the connection.

[0039] S53: Start the hydraulic control system of the auxiliary equipment, control the extension and retraction of the first cylinder 503 and the second cylinder 505, drive the two diamond wire saws 6 to rotate relative to each other, and bring the cutting ends closer to each other to form an inverted V-shaped cutting trajectory. Then start the diamond wire saws 6 to cut the beam 402. During the cutting process, control the cutting speed to 5-10cm / h to avoid excessive vibration of the beam. The posture is like an inverted V-shape. Figure 10 As shown, the cut beam 402 is not only fixed by the first hoisting rope 803, but also supported by the part of the beam 402 fixed to the pier 401, thus preventing the middle section of the beam 402 from falling after being cut, and thus ensuring higher safety.

[0040] S54: After the middle section of beam 402 is cut, the crane slowly lifts the middle section of the beam and places it at the treatment point under the bridge or directly lifts it onto a transport vehicle to avoid occupying construction space. After the hoisting is completed, the connection between the first hoisting rope 803 and the beam 402 is removed; S55: The crane boom lifts the auxiliary equipment to the side of pier 401 of the old pier 101, and operates fastener 7 to clamp pier 401, ensuring stable clamping. After clamping, as... Figure 11 As shown; the second lifting rope 804 is released from the boom and connected to the remaining beam 402 above the pier 401 and the top of the pier 401 being cut, respectively, and the lifting rope is pre-tightened; When hoisting auxiliary equipment, there are more than two second lifting ropes 804, which are connected to both sides of the connection point of the auxiliary equipment connecting seat 501. During hoisting, there are more second lifting ropes 804 on one side than on the other side, which causes the auxiliary equipment to tilt. Then, the construction personnel cooperate to calibrate and lower the auxiliary equipment as needed. Figure 11 It is placed close to the pier 401 as shown, and then clamped and fixed by fasteners 7.

[0041] S56: Adjust the diamond wire saw 6 of the auxiliary equipment to a horizontal position, start the diamond wire saw 6 to make horizontal cuts on the pier 401. The cutting position is determined according to the demolition requirements, preferably 1-2m from the ground. S57: After the pier 401 is cut, the crane lifts the remaining beam 402 and the cut pier 401 and slowly places them on the processing point or transport vehicle for transport away. S58: Repeat steps S55-S57 to remove all redundant old bridge piers 101 in sequence until all bridge piers have been removed.

[0042] S6: Construct a new bridge deck on the reinforced and expanded old bridge pier 101, which will be the second new bridge deck 303. After the removal of the excess old bridge pier 101, the second new bridge deck 303 will be constructed on the reinforced and expanded old bridge pier 101. The structural form of the second new bridge deck 303 is the same as that of the first new bridge deck 302. It is a prestressed concrete rigid frame bridge deck with a width of 10-12m. It is symmetrically arranged with the first new bridge deck 302 and has the same height. The construction process is the same as that of S3, including scaffolding erection, formwork installation, rebar binding, concrete pouring, prestressing tensioning and grouting. After the construction of the second new bridge deck 303 is completed, it will be cured to 100% of the design strength.

[0043] S7: Access road 2 is demolished; the first new bridge deck 302 and the second new bridge deck 303 are open to traffic. After the maintenance of the second new bridge deck 303 is completed, the construction access road 2, construction platform 201 and temporary iron trestle bridge 9 will be demolished, and the concrete waste from access road 2 will be recycled; access road 2 may also remain in place if necessary; the connection between the first new bridge deck 302 and the second new bridge deck 303 will be reinforced: a C50 concrete wet joint will be poured at the connection, with connecting steel bars inside, and both ends will be anchored to the two bridge decks respectively; after the wet joint is maintained, a median guardrail will be installed between the two bridge decks to divide the first new bridge deck 302 and the second new bridge deck 303 into lanes in different directions, such as two-way four lanes, so that the new bridge can be fully opened to traffic.

[0044] The connection between the first new bridge deck 302 and the second new bridge deck 303 may also be left unconnected, with only guardrails installed.

[0045] Example 2: like Figure 8 , 9 As shown in Figures 10 and 11, an auxiliary device for a demolition and reconstruction method of an old bridge and a new rigid frame bridge in situ includes a connector 5, a diamond wire saw 6, fasteners 7, and a hoisting assembly. The entire device is made of Q355B steel and has the characteristics of high strength and vibration resistance, making it suitable for the complex working conditions of bridge demolition.

[0046] The diamond wire saw 6 can be made using existing equipment, and its cutting structure can be referenced from existing mobile diamond wire saws.

[0047] Furthermore, the connector 5 includes a connector 501, which is a box-shaped steel structure with internal reinforcing partitions to ensure structural strength. A connector 502 and a pull ring 508 are welded to the top of the connector 501. The connector 502 is connected to a connecting pipe 802 by bolts, including a high-pressure hydraulic oil pipe and electrical wiring. The connecting pipe 802 is connected to an external hydraulic control system, preferably a PLC-100, for controlling the movement of the hydraulic cylinder. The pull ring 508 is used to connect a second lifting rope 804, preferably a steel wire rope, for assisting in the hoisting of the equipment.

[0048] A first hydraulic cylinder 503 is fixed to the side of the connecting seat 501 near the diamond wire saw 6 via a reinforcing plate 504. The preferred model of the first hydraulic cylinder 503 is HSG125×500. A second hydraulic cylinder 505 is hinged to the side of the connecting seat 501 near the diamond wire saw 6 via a connecting plate 507. The preferred model of the second hydraulic cylinder 505 is HSG100×400. The first hydraulic cylinder 503 and the second hydraulic cylinder 505 are arranged parallel to each other vertically. The end of the piston rod is hinged to the mounting plate 506 via the connecting plate 507. The diamond wire saw 6 is fixedly mounted on the mounting plate 506 and connected in the existing manner, moving synchronously with the mounting plate 506.

[0049] When the first hydraulic cylinder 503 and the second hydraulic cylinder 505 extend or retract to different lengths, they can drive the diamond wire saw 6 to rotate relative to the connecting seat 501, with a rotation angle range of -30° to 45°. When the two diamond wire saws 6 rotate relative to each other and their cutting ends approach each other, they form an inverted V-shaped cutting trajectory, which is used for inverted V-shaped cutting of the beam 402 to prevent the beam from accidentally falling during the cutting process. When the two diamond wire saws 6 are horizontal, they facilitate vertical and horizontal cutting. Furthermore, the two diamond wire saws 6 can be used individually, rather than having to be used simultaneously.

[0050] When the first hydraulic cylinder 503 and the second hydraulic cylinder 505 extend or retract by the same length, they are used to change the distance between the two diamond wire saws 6 to meet different cutting requirements.

[0051] The fastener 7 includes four clamping rods 701 that are preferably hinged to the connecting seat 501. The clamping rods 701 are symmetrically distributed on both sides of the connecting seat 501. A third hydraulic cylinder 703 is provided between the middle of the clamping rod 701 and the bottom of the connecting seat 501. The third hydraulic cylinder 703 is preferably of model HSG80×300. The two ends of the third hydraulic cylinder 703 are respectively hinged to the middle of the clamping rod 701 and the bottom of the connecting seat 501 through pins. A clamping part 704 is welded to the bottom of the clamping rod 701 near the connecting seat 501. The inner side of the clamping part 704 is provided with an anti-slip groove to enhance the clamping friction and thus increase the clamping stability.

[0052] When the third cylinder 703 retracts, it drives the bottom ends of the clamping rods 701 on both sides of the two connecting seats 501 to move closer to each other, thereby driving the clamping parts 704 to move closer to each other, thus clamping the pier 401 or the beam 402; when the third cylinder 703 extends, the clamping parts 704 move away from each other, releasing the clamped parts, making the operation convenient and efficient.

[0053] The auxiliary equipment also includes a connector 801 for connecting to the crane. The connector 801 contains several guide wheels for guiding the lifting ropes. The lifting assembly also includes several first lifting ropes 803 and second lifting ropes 804. The second lifting ropes 804 are preferably steel wire ropes and are used to connect to the pull rings 508 of the connector 5. The first lifting ropes 803 are preferably steel wire ropes and are used to connect to the pier 401 or beam 402 to be lifted. Both the first lifting ropes 803 and the second lifting ropes 804 pass through the guide wheels of the connector 801 and can be connected to a boom and electric hoist as needed to achieve precise lifting of the auxiliary equipment and the dismantled parts.

[0054] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An auxiliary device for a demolition and reconstruction method of an old bridge and a new rigid frame bridge built on the same site, characterized in that: Includes connector (5), with diamond wire saws (6) on both sides of connector (5); The bottom end of the connector (5) is provided with a fastener (7) for clamping the pier; The top of the connector (5) is connected to the boom; The connector (5) includes a connector (501); The top of the connecting seat (501) is provided with a connecting flange (502) and a pull ring (508); The connecting flange (502) is connected to the external connecting pipe (802), and the connecting pipe (802) is connected to the external hydraulic control system; The pull ring (508) is used to connect the second lifting rope (804); The first hydraulic cylinder (503) is fixed to the side of the connecting seat (501) near the diamond wire saw (6) by a reinforcing plate (504); The connecting seat (501) is hinged to the second hydraulic cylinder (505) via the connecting plate (507) on the side near the diamond wire saw (6); The diamond wire saw (6) is equipped with a mounting plate (506); The first hydraulic cylinder (503) and the second hydraulic cylinder (505) are both hinged to the mounting plate (506) via the connecting plate (507); The fastener (7) includes a plurality of clamping rods (701) hinged to the connecting seat (501), the clamping rods (701) being located on both sides of the connecting seat (501); A third hydraulic cylinder (703) is provided between the middle part of the clamping rod (701) and the bottom end of the connecting seat (501); the two ends of the third hydraulic cylinder (703) are respectively hinged to the middle part of the clamping rod (701) and the bottom end of the connecting seat (501); A clamping part (704) is provided on the side of the bottom end of the clamping rod (701) near the connecting seat (501).

2. The auxiliary equipment for the demolition and reconstruction method of an old bridge and the in-situ reconstruction of a rigid frame bridge as described in claim 1, characterized in that: It is also equipped with a connector (801) for connecting to the crane, and the connector (801) has a guide wheel inside; It is also equipped with several first lifting ropes (803) and second lifting ropes (804), the first lifting ropes (803) and second lifting ropes (804) pass through the guide wheel and are connected to the boom and electric hoist; The first lifting rope (803) is used to connect the pier (401) or beam (402) being lifted, and the second lifting rope (804) is used to connect the connector (5).

3. The auxiliary equipment for the demolition and reconstruction method of an old bridge and the in-situ reconstruction of a rigid frame bridge as described in claim 1, characterized in that: The first hydraulic cylinder (503) and the second hydraulic cylinder (505) are arranged vertically. When the first cylinder (503) and the second cylinder (505) extend and retract to different lengths, the diamond wire saw (6) rotates relative to the connecting seat (501); Two diamond wire saws (6) rotate relative to each other, with their cutting ends close together, for cutting bridge piers in an inverted V-shape.

4. The construction method for demolishing an old bridge and rebuilding a rigid frame bridge on the same site is characterized by: The auxiliary equipment for the demolition and reconstruction method of old bridges and the in-situ reconstruction of rigid frame bridges, as described in any one of claims 1-3, includes the following steps: S1. Construction access road and construction platform along the design direction, the access road and construction platform are connected; the access road is used for the passage of construction vehicles, equipment and materials; S2. Construct new bridge piers on the side of the old bridge deck according to the design plan; S3. Construction of a new bridge deck on the new bridge piers, which is the first new bridge deck; S4. After the first new bridge deck is completed, the old bridge deck will be demolished in batches. S5. Reinforce and expand the old bridge piers according to the design requirements, and remove the excess bridge piers. S6. Construct a new bridge deck on the reinforced and expanded old bridge piers, which is called the second new bridge deck; S7, the temporary road was demolished, and the first and second new bridge decks were opened to traffic, which are lanes for different directions of the new bridge; The connection between the first and second new bridge decks has been reinforced, and a central guardrail has been installed.

5. The method for demolishing an old bridge and constructing a new rigid frame bridge on the same site as described in claim 4, characterized in that: The construction platform is located in the middle section of the old bridge; S1 includes: S11. Construction access road along the design direction; S12. A temporary iron trestle bridge shall be erected on the side of the design location of the construction platform and on the side of the old bridge. S13. The temporary iron trestle bridge connects to the old bridge deck; the temporary iron trestle bridge is used to maintain traffic flow during construction and does not affect the passage of other vehicles. S14. Demolish the old bridge deck at the designed location of the construction platform; S15. The construction platform has been completed and connected to the access road.

6. The demolition and reconstruction method for a rigid frame bridge in situ after demolishing an old bridge, as described in claim 4. Its characteristic is: In S5: Auxiliary equipment was used to cut and demolish the piers of the old bridge that needed to be removed; the bridge was cut in an inverted V-shape during the cutting process, and after the cutting was completed, it was lifted by a crane to the garbage disposal point; The old bridge piers that need to be retained will be reinforced, and the superstructure will be installed.

7. The method for demolishing an old bridge and constructing a new rigid frame bridge on the same site as described in claim 4, characterized in that: in In S4, a road cutting machine is used to cut the old bridge deck asphalt pavement and concrete hollow slabs; Demolition proceeds from the outside in, first removing the side slabs of the hollow concrete slab, then the middle slab, and so on. Hoisting equipment is used to transport the hollow slabs in sections to the old bridge for crushing. When the old bridge deck was demolished, the first new bridge deck was opened to traffic.

8. The method for demolishing an old bridge and constructing a new rigid frame bridge on the same site as described in claim 6, characterized in that: in The following steps are involved in cutting off the bridge piers: S51. Use a crane to place the auxiliary equipment on the top middle section of the bridge pier to be demolished; S52, Auxiliary equipment clamps the bridge through a clamping structure; The crane arm extends a hoisting rope to connect to the removed middle section of the bridge; S53. The bridge is cut in an inverted V-shape using a cutting machine attached to an auxiliary device; S54. The crane lifts the middle section of the bridge and places it at the disposal point or on a transport vehicle for removal. S55. The crane boom lifts the auxiliary equipment to the side of the pier and clamps the pier on the side of the pier. The crane arm extends a hoisting rope to connect the remaining bridge above the pier to the top of the pier being cut. S56. Use the cutting machine attached to the auxiliary equipment to horizontally cut the pier; S57. The crane lifts the remaining bridge and cut piers and places them at the processing point or on a transport vehicle for removal. S58. Repeat S55-S57 until all bridge piers are removed.

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