Construction method for removing column pier of elevated bridge based on reserved column head

Abstract

The present application relates to a kind of based on the operation of reserved column head elevated bridge pier body dismantling construction method, its steps are as follows: setting lifting point in steel cross beam and installing fixed pulley;According to the marked hoisting hole position, water drill is used to drill, and the hoisting point is installed to the opposite round steel;In the marked cutting surface position, rope saw guide wheel and cutting equipment are installed, and first knife cutting surface is cut;Steel wire rope, hand-operated hoist are installed, and after folding arm crane is in position, steel wire rope is hung;Rope saw guide wheel and cutting equipment are installed, and second knife cutting surface is cut;Through the synchronous cooperation of hand-operated hoist and folding arm crane, cutting block is slowly moved out of the original pier body plane position, then slowly lowered to ground;Repeat the previous steps until the column is dismantled.The present application can safely and effectively solve the problem that large mechanical equipment cannot be used to dismantle old column in narrow space by manual cooperation with hand-operated hoist, rope saw, folding arm crane and other tools without collision to reserved column head and replacement steel frame in limited space.

Description

Technical Field

[0001] This invention relates to a method for demolishing the piers of operational elevated bridge columns, and more particularly to a method for demolishing the piers of operational elevated bridge columns based on retaining the column heads. Background Technology

[0002] In recent years, with the rapid development of urbanization in my country, above-ground and underground buildings have gradually shown an integrated trend. The number of urban elevated roads and underground tunnels has increased dramatically. As a result, underground tunnels often cross existing elevated roads, and there are situations where shield tunneling cannot avoid existing elevated bridge piers and abutments. Since the existing elevated roads are already in operation, and rerouting elevated roads would increase costs significantly, how to ensure the safety of the elevated roads while ensuring the normal operation of the existing elevated roads and the normal shield tunneling of underground tunnels has become an important problem that urgently needs to be solved in current urban construction. Summary of the Invention

[0003] The present invention aims to provide a construction method for dismantling the pier body of an operational elevated bridge column based on retaining the column head, in order to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution of the present invention is: a construction method for dismantling the pier body of an operational elevated bridge column based on retaining the column head, comprising the following steps:

[0005] S1: Set up lifting points on the steel crossbeam and install fixed pulleys;

[0006] S2: Mark the cutting surfaces of the segmented blocks and the locations of the hoisting holes on the demolished column;

[0007] S3: Drill holes using a water drill according to the marked lifting hole positions, and install through round steel bars as lifting points;

[0008] S4: Install the wire saw guide wheel and wire saw cutting equipment at the marked cutting surface position to make the first cutting surface cut;

[0009] S5: Install wire ropes, manual hoists, and folding arm hoists with wire ropes;

[0010] S6: Install the wire saw guide wheel and wire saw cutting equipment to cut the second cutting surface;

[0011] S7: By manually controlling the manual hoist and the folding arm crane in sync, the cutting block is slowly moved out of the original plane position of the pier body and then slowly lowered to the ground;

[0012] S8: Repeat the previous steps until the column is completely removed.

[0013] Furthermore, when existing operational elevated bridge pile foundations conflict with newly constructed shield tunneling lines, it is necessary to replace and modify the substructure of the bridge. To ensure that the structure and load-bearing system of the operational elevated bridge do not deform or be affected during the replacement and modification process, in-situ jacking and replacement are required. For the renovation of old bridge piers, since there is no construction space at the top, the top column head is retained. After the old bridge pile foundations are removed and cleared, the column head is raised from the top of the newly constructed pier cap to the bottom of the column head.

[0014] Furthermore, the steel crossbeams are temporary support steel brackets for the transverse steel box girder, and the steel longitudinal beams are temporary steel brackets for the longitudinal steel box girder. Each support pier has a main longitudinal beam attached to each side of the old column. Because the steel longitudinal beams limit the crane's operating height, the top cutting section and the hook are on the same horizontal plane. According to the specifications, the top cutting section cannot be removed by rotating the crane. Therefore, lifting points are set on the steel crossbeams on both sides, and fixed pulleys are installed. The section is pulled by wire ropes and manual hoists until it is transported to the area below the hook.

[0015] Furthermore, in steps S2 to S3, the cutting surface of the pier column and the position of the hoisting hole are marked. The hoisting hole of the top cutting section is a through hole that passes through the centroid between the two hoisting points. After drilling with a water drill, a round steel bar is inserted and bent into a hook shape. After welding, it serves as a hoisting point for steel wire rope traction.

[0016] Further, in steps S4 to S6, the wire saw guide wheel and wire saw equipment are installed at the marked first cutting surface position. After the cutting is completed, the bottom ends of the two wire ropes are connected to a manual hoist, and the top ends are fixed to the round steel hooks through the steel beam lifting points using rope clamps. In addition to the round steel, the through hole of the top cutting section is also threaded with a crane wire rope as a safety measure and for subsequent hoisting. After the wire ropes are installed, the wire saw guide wheel and wire saw equipment are installed at the marked second cutting surface position to complete the cutting.

[0017] Further, in steps S7 and S8, after the second cut is completed, a manual hoist is used to pull the top cut section horizontally towards the crane using steel wire ropes at both ends. After slowly moving it out of the original pier plane position, the crane's steel wire rope is used to slowly lower it to the ground, completing the removal of the top cut section. Subsequent cut sections are removed by repeating the previous steps to complete the removal of the old bridge pillars.

[0018] The beneficial effects of this invention are as follows:

[0019] 1. This invention, while ensuring the normal operation of the existing elevated bridge deck, adopts a top-support replacement construction method to modify the substructure of the elevated bridge, ensuring the smooth advancement of the subsequent underground tunnel shield tunneling. It neither relocates the original elevated road nor changes the planned route of the underground tunnel, thus shortening the construction period and reducing costs to a certain extent.

[0020] 2. This invention enables the segmented cutting and dismantling of column piers with retained upper column heads under conditions of ultra-low headspace and confined space, effectively ensuring construction safety and reducing construction risks and difficulties. Attached Figure Description

[0021] Figure 1 This is a plan layout diagram of the construction method for dismantling the piers of elevated bridges according to the present invention;

[0022] Figure 2 This is an elevation layout diagram of the construction method for dismantling the piers of elevated bridges according to the present invention;

[0023] In the diagram: 1-Steel longitudinal beam, 2-Steel column, 3-Steel crossbeam, 4-New batch of foundation piles, 5-Folding arm crane, 6-Wire saw, 7-Old column, 8-Lifting lug, 9-Fixed pulley, 10-Wire rope, 11-Manual hoist, 12-New pile foundation, 13-Old bridge pile foundation, 14-Lifting hole, 15-Retained column head. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 As shown in Figure 2, an embodiment of the present invention provides a method for dismantling the pier body of an operational elevated bridge column based on retaining the column head, comprising the following steps:

[0026] S1: Set up lifting points on the steel crossbeam 3 and install fixed pulleys 9;

[0027] S2: Mark the cutting surface of the segment block and the position of the hoisting hole 14 on the demolition column;

[0028] S3: Drill holes at the marked lifting hole 14 using a water drill, and install through round steel bars as lifting points;

[0029] S4: Install the wire saw 6 guide wheel and wire saw 6 cutting equipment at the marked cutting surface position to make the first cutting surface cut;

[0030] S5: Install wire rope 10, manual hoist 11, and folding boom crane 5 with wire rope 10;

[0031] S6: Install the wire saw 6 guide wheel and wire saw 6 cutting equipment to cut the second cutting surface;

[0032] S7: Manually control the hoist 11 and the folding arm crane 5 to work in sync to slowly move the cutting block out of the original pier plane position and then slowly lower it to the ground;

[0033] S8: Repeat the previous steps until the column is completely removed.

[0034] In the above steps: when the existing operational elevated bridge pile foundation conflicts with the newly constructed tunnel boring machine (TBM) line, the substructure of the bridge needs to be upgraded by underpinning. To ensure that the structure and load-bearing system of the operational elevated bridge are not deformed or affected during the underpinning process, in-situ jacking and underpinning are required; for the renovation of old bridge piers, since there is no construction space at the top, the top column head is retained, and after the old bridge pile foundation is removed and cleared, it is extended from the top of the newly constructed abutment to the bottom of the column head.

[0035] In step S1, the steel crossbeam is a temporary support for the transverse steel box girder, and the steel longitudinal beam is a temporary support for the longitudinal steel box girder. Each support pier has a main longitudinal beam attached to each side of the old column. Because the steel longitudinal beam restricts the crane's operating height, the top cutting section and the hook are on the same horizontal plane. According to the specifications, the top cutting section cannot be removed by rotating the crane. Therefore, lifting points are set on the steel crossbeams on both sides, and fixed pulleys are installed. The section is pulled by wire rope and manual hoist until it is transported to the area below the hook.

[0036] In steps S2 to S3, the cutting surface of the pier column and the position of the hoisting hole are marked. The hoisting hole of the top cutting section is a through hole that passes through the centroid between the two hoisting points. After drilling with a water drill, a round steel bar is inserted and bent into a hook shape. After welding, it is used as a hoisting point for steel wire rope traction.

[0037] In steps S4-S6, the wire saw guide wheel and wire saw are installed at the marked first cutting surface. After cutting, the bottom ends of the two wire ropes are connected to a manual hoist, and the top ends are secured to the round steel hooks via rope clamps through the steel beam lifting points. In addition to the round steel, a crane wire rope is also threaded through the through hole in the top cutting section as a safety measure and for subsequent hoisting. After the wire ropes are installed, the wire saw guide wheel and wire saw are installed at the marked second cutting surface to complete the cutting.

[0038] In steps S7 and S8, after the second cut is completed, a manual hoist is used to pull the top cut section horizontally towards the crane using steel wire ropes at both ends. After slowly moving it out of its original pier position, the crane's steel wire ropes are used to slowly lower it to the ground, completing the removal of the top cut section. Subsequent cut sections are removed by repeating the previous steps to complete the removal of the old bridge pillars.

[0039] Furthermore, step S1 specifically includes:

[0040] Step 1-1: Use an aerial work platform to operate at height. Weld lifting points on the steel crossbeams 3 on both sides of the steel bracket and install the fixed slide 9.

[0041] Furthermore, step S2 specifically includes:

[0042] Step 2-1: According to the construction plan requirements, mark each cut surface and the position of hoisting hole 14 on the column with a marker.

[0043] Furthermore, step S3 specifically includes:

[0044] Step 3-1: To ensure the safe lowering of the cutting block, an aerial work platform is used for the operation. A through-hole 14 is drilled on the cutting block using a water drill. The through-hole 14 is located between the lifting points of the two horizontal beams and passes through their centroid.

[0045] Step 3-2: After drilling a hole with a water drill, insert a round steel bar and bend it into a hook shape. After welding, it serves as the traction and lifting point for the steel wire rope 10. At the same time, insert a short section of steel wire rope 10 for use by the crane later.

[0046] Furthermore, step S4 specifically includes:

[0047] Step 4-1: Use an aerial work platform to operate at height, and install guide wheels and wire saw chains according to the marked cutting surface positions;

[0048] Step 4-2: Position the wire saw 6 cutting machine, connect the water and power supply, and complete the cutting of the first cutting surface.

[0049] Furthermore, step S5 specifically includes:

[0050] Step 5-1: Connect the bottom ends of the two steel wire ropes 10 to the manual hoist 11, and secure the top ends to the fixed pulleys 9 of the steel crossbeams 3 on both sides and the round steel hooks with rope clamps. Hang the manual hoist 11 on the bottom of the steel column 2 and tighten it.

[0051] Step 5-2: Position the folding boom crane, attach the short steel wire rope 10 from Step 3-2 to the hook of the folding boom crane, and lock the hook safety buckle.

[0052] Furthermore, step S6 specifically includes:

[0053] Step 6-1: Use an aerial work platform to operate at height, and install guide wheels and wire saw chains according to the marked cutting surface positions;

[0054] Step 6-2: Position the wire saw 6 cutting machine, connect the water and power supply, and complete the cutting of the second cutting surface.

[0055] Furthermore, step S7 specifically includes:

[0056] Step 7-1: On the side where the cutting block has been moved out, manually pull the manual hoist 11 to slowly move the cutting block.

[0057] Step 7-2: On the other side where the cutting block has been moved out, manually and slowly release the manual hoist 11 in sync with step 7-1, while the folding boom crane 5 slowly rotates its boom.

[0058] Step 7-3: After the cutting block has been completely moved out of the original column plane and the overall weight has been transferred to the crane, release the manual hoist 11 and slowly lower the cutting block to the ground using the crane.

[0059] Step 8-1: Repeat the previous steps for subsequent cutting sections to complete the removal of the old bridge pillars.

Claims

1. A construction method for demolishing the pier body of an operational elevated bridge column based on retaining the column head, wherein when the existing operational elevated bridge pile foundation conflicts with the newly constructed shield tunneling line, and the substructure of the bridge needs to be upgraded by underpinning, in-situ jacking and underpinning is required to ensure that the structure and load-bearing system of the operational elevated bridge are not deformed or affected during the underpinning process; for the renovation of old bridge piers, since there is no construction space at the top, the top column head is retained, and after the old bridge pile foundation is removed and cleared, the column head is extended from the top of the newly constructed abutment to the bottom of the column head, characterized in that... The method includes the following steps: S1: Lifting points are set on the steel crossbeams and fixed pulleys are installed: The steel crossbeams are temporary steel support for the transverse steel box girder, and the steel longitudinal beams are temporary steel support for the longitudinal steel box girder. Each support pier has a main longitudinal beam attached to each side of the old column. Because the steel longitudinal beams limit the crane's operating height, the top cutting section and the hook are on the same horizontal plane. According to the specifications, the top cutting section cannot be removed by rotating the crane. Therefore, lifting points are set on the steel crossbeams on both sides and fixed pulleys are installed. The steel wire rope and manual hoist are used for traction until the section is transported to the bottom of the hook. S2: Mark the cutting surfaces and lifting hole positions of the segmented blocks on the demolished column: Mark the cutting surfaces and lifting hole positions of the pier column. The lifting hole for the top cutting section is located in a through hole passing through the centroid between the two lifting points. S3: Drill holes according to the marked lifting hole positions using a water drill, and install through round steel as lifting points: After drilling holes with a water drill, insert round steel and bend it into a hook shape, then weld it to serve as a lifting point for wire rope traction; S4: Install the wire saw guide wheel and wire saw equipment at the marked first cutting surface position to cut the first cutting surface; S5: Install wire rope, manual hoist and folding arm hanging wire rope: After cutting, connect the bottom ends of the two wire ropes to the manual hoist, and fix the top ends to the round steel hook through the steel beam lifting point using rope clamps; in addition to the round steel, the through hole of the top cut section is also threaded with the crane wire rope as a safety measure and for subsequent hoisting. S6: Install the wire saw guide wheel and wire saw cutting equipment to cut the second cutting surface; after the wire rope is installed, install the wire saw guide wheel and wire saw equipment at the marked position of the second cutting surface to complete the cutting of the second cutting surface; S7: By manually controlling the manual hoist and the folding arm crane in sync, the cutting block is slowly moved out of the original pier plane position and then slowly lowered to the ground: After the second cut is completed, the top cutting section is moved horizontally towards the crane by manually controlling the manual hoist and using the steel wire ropes at both ends to slowly move out of the original pier plane position. Then, the top cutting section is slowly lowered to the ground by the crane's steel wire rope to complete the removal of the top cutting section. S8: Repeat the previous steps until the column is completely removed.

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