Underpinning reconstruction method for dismantling operating viaduct piers

Abstract

The present application relates to a kind of underpinning reconstruction methods for operating viaduct column dismantling, its steps are:1) setting lifting point in main longitudinal beam;2) marking out split block cutting surface and hoisting hole position on the column to be dismantled;3) using water drill to drill according to the hoisting hole position marked;4) using steel wire rope to pass into hoisting hole, and using hand-operated hoist to pull tight at both ends;5) after installing the cutting surface position marked installs rope saw guide wheel and rope saw cutting equipment, cutting separation is carried out;6) slowly lower the cutting block to ground by manual hoist manual cooperation;7) repeat the previous steps until column dismantling is completed.The present application can safely and effectively solve the problem that large mechanical equipment cannot be used in narrow space by manual cooperation with hand-operated hoist and rope saw and other tools, and the problem that old column is difficult to dismantle, while saving manpower and material resources, saving cost, the method is simple and safe and efficient.

Description

Technical Field

[0001] This invention relates to a method for dismantling columns of elevated bridges, and more particularly to a method for dismantling old columns of operational elevated bridges in a supporting state and in confined spaces. 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 been increasing day by day. In some environments, due to space constraints or other reasons, underground tunnels often cross existing elevated roads. This occurs when shield tunneling cannot avoid the existing elevated bridge piers and abutments. Since the existing elevated roads are already in operation and rerouting them would increase costs significantly, how to ensure the safety of the elevated roads while ensuring the normal operation of the underground tunnel shield tunneling has become an important problem that urgently needs to be solved in current urban construction. A method for efficiently and safely removing old pillars in a supporting state and in confined spaces is needed. Summary of the Invention

[0003] The present invention aims to provide a method for the replacement and reconstruction of the columns of elevated bridges in operation, 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 method for replacing and modifying the support columns of an operational elevated bridge, comprising the following steps:

[0005] S1: Install lifting points on the main longitudinal beam;

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

[0007] S3: Drill holes using a water drill according to the marked lifting hole positions;

[0008] S4: Steel wire rope is inserted into the hoisting hole and tightened at both ends using manual hoists;

[0009] S5: After installing the wire saw guide wheel and wire saw cutting equipment at the marked cutting surface position, proceed with cutting and separation;

[0010] S6: The cutting block is slowly lowered to the ground using a manual hoist;

[0011] S7: Repeat the previous steps until the column is completely removed.

[0012] Furthermore, due to the conflict between the existing operational elevated pile foundation and the newly built shield tunnel line, it is necessary to carry out the replacement and renovation of the bridge substructure: erect temporary steel supports, lift and replace the existing bridge, and demolish the old bridge columns, abutments, and pile foundations; due to the limited space under the bridge and the inability to use large mechanical equipment, the demolition of the old columns is difficult, and it is necessary to use the main longitudinal beam of the steel support for segmented hoisting and demolition.

[0013] Furthermore, in step S1, the steel longitudinal beam is a temporary steel support longitudinal steel box girder. There is a main longitudinal beam on each side of the old column of each pier. According to the stress calculation analysis, the position of the lifting point is confirmed, and the lifting point is set after marking on the main longitudinal beam and installing the manual hoist.

[0014] Furthermore, in steps S2 to S3, based on the verification analysis, the cutting surface and the location of the hoisting hole are determined. An aerial work platform is used to climb the work platform, markings are made on the dismantled column pier, and a water drill is used to open through holes.

[0015] Furthermore, in step S4, a steel wire rope of suitable specifications, verified by calculation, is threaded into the hoisting hole, and a manual hoist is connected to both ends by rope clamps and tightened.

[0016] Furthermore, in steps S5 to S7, according to the cutting surface position marked in step S2, the wire saw guide wheel and chain are installed, and the water and power sources are connected. Cutting and separation are carried out from the outside to the inside: first horizontal cutting, then vertical separation; the cutting blocks are slowly lowered to the ground with the help of steel wire ropes and manual hoists, and the previous steps are repeated until the column removal operation is completed.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. This invention, while ensuring the normal operation of existing elevated roads, adopts top-support replacement construction to enable the normal construction of underground tunnel shield tunnels. It does not relocate the original elevated roads, nor does it change the planned route of the underground tunnels, thus shortening the construction period and reducing costs to a certain extent.

[0019] 2. This invention, through the combined use of manual hoists and wire saws, can safely and effectively solve the problems of not being able to use large machinery in confined spaces and the difficulty of dismantling old pillars. This method saves manpower and resources, reduces costs, is simple to operate, and is safe and efficient. By cutting and dismantling the pillars in sections within confined spaces, construction safety is effectively ensured and construction difficulty is reduced. Attached Figure Description

[0020] Figure 1 This is a plan view of the replacement and reconstruction method for dismantling the columns of an elevated bridge according to the present invention.

[0021] Figure 2 This is a longitudinal section layout diagram of the replacement and reconstruction method for dismantling the columns of an elevated bridge in this invention.

[0022] Figure 3 This is a cross-sectional layout diagram of the method for replacing and modifying the columns of an elevated bridge in operation according to the present invention.

[0023] In the diagram: 1-Drilled pile, 2-Larsen sheet pile, 3-New batch of pile caps, 4-Temporary steel column, 5-Old column, 6-Steel beam, 7-Main longitudinal beam, 8-Temporary support, 9-Bridge, 10-Cutting line, 11-Lifting hole, 12-Manual hoist, 13-Lifting point. Detailed Implementation

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

[0025] like Figures 1 to 3 As shown in the figure, an embodiment of the present invention provides a method for the replacement and reconstruction of the columns of an operational elevated bridge, which includes the following steps:

[0026] S1: Install lifting points on the main longitudinal beam 7;

[0027] S2: Mark the cutting surface of the segmented block and the position of the hoisting hole 11 on the demolition column;

[0028] S3: Drill holes at the marked lifting hole 11 using a water drill;

[0029] S4: Use steel wire rope to thread through the hoisting hole 11 and tighten it at both ends with manual hoists 12;

[0030] S5: After installing the wire saw guide wheel and wire saw cutting equipment at the marked cutting surface position, proceed with cutting and separation;

[0031] S6: The cutting block is slowly lowered to the ground by manual hoist 12;

[0032] S7: Repeat the previous steps until the column is completely removed.

[0033] In the above steps, due to the conflict between the existing operating elevated pile foundation and the newly built shield tunnel line, it is necessary to carry out the replacement and modification of the bridge substructure: erect temporary steel supports, lift and replace the existing bridge, and demolish the old bridge columns, abutments, and pile foundations; due to the limited space under the bridge and the inability to use large mechanical equipment, it is difficult to demolish the old columns, so it is necessary to use the steel bracket main longitudinal beam 7 to carry out the segmented hoisting and demolition.

[0034] In step S1, the steel longitudinal beam is a temporary steel support for the longitudinal steel box girder of the bridge. There is a main longitudinal beam 7 on each side of the old column of each pier. According to the stress calculation analysis, the position of the lifting point is confirmed, and the lifting point is set after marking on the main longitudinal beam using an aerial work platform and installing a manual hoist.

[0035] In steps S2 to S3, based on the verification analysis, the cutting surface and the location of the hoisting hole are determined. An aerial work platform is used to climb the platform, markings are made on the dismantled column pier, and a water drill is used to open through holes.

[0036] In step S4, a steel wire rope of the appropriate specification, verified by calculation, is threaded into the hoisting hole 11, and connected to the manual hoist 12 at both ends by rope clamps and tightened.

[0037] In steps S5 to S7, according to the cutting surface position marked in step S2, install the wire saw guide wheel and chain, connect the water and power supply, and cut and separate from the outside to the inside: first cut horizontally, then separate vertically; using wire rope and manual hoist 12, manually lower the cutting block to the ground, repeat the previous steps until the column removal operation is completed.

[0038] Furthermore, step S1 specifically includes:

[0039] Step 1-1: Use an aerial work platform to work at height and weld the lifting points;

[0040] Furthermore, step S2 specifically includes:

[0041] Step 2-1: Mark each cutting line and the position of the hoisting hole 11 on the column with a marker according to the construction plan.

[0042] Furthermore, step S3 specifically includes:

[0043] Step 3-1: To ensure the safe lowering of the cutting blocks, a through-hole 11 is drilled on each cutting block using a water drill.

[0044] Step 3-2: Use an aerial work platform to access the hole from above.

[0045] Furthermore, step S4 specifically includes:

[0046] Step 4-1: Pass the wire rope through the through hoisting hole 11, and use manual hoists 12 to hang it on the hoisting points set on the main longitudinal beam 7 and tighten it.

[0047] Step 4-2: Pay attention to the protection of the wire rope. The contact surface between the wire rope and the edge of the lifting hole 11 will cause shearing of the wire rope.

[0048] Furthermore, step S5 specifically includes:

[0049] Step 5-1: Use an aerial work platform to operate at height, and install guide wheels and wire saw chains according to the marked cutting surface positions;

[0050] Step 5-2: Position the wire saw cutter, connect the water and power supply, and begin cutting;

[0051] Furthermore, step S6 specifically includes:

[0052] Step 6-1: After cutting, remove the cutting equipment;

[0053] Step 6-2: Manually lower the cutting block to the ground by loosening the hand hoist 12.

Claims

1. A method for operating a viaduct column demolition underpinning reconstruction, due to the conflict between the existing operating elevated pile foundation and the newly built shield line, the underpinning reconstruction of the lower structure of the bridge is needed: temporary steel support is erected, the existing bridge is jacked up, the old bridge column, pile cap and pile foundation are demolished; due to the limited space below the bridge and the inability to use large mechanical equipment, the old column is difficult to remove, and the steel bracket main longitudinal beam is needed to block the lifting and removal, characterized in that, Includes the following steps: S1: Setting up lifting points on the main longitudinal beams: The steel longitudinal beams are temporary steel supports for the longitudinal steel box girders of the bridge. There is one main longitudinal beam on each side of the old column of each pier. Based on the stress calculation and analysis, the lifting point positions are confirmed. After marking the main longitudinal beams with a ladder truck, the lifting points are set up and manual hoists are installed. S2: Mark the cutting surface and hoisting hole position of the segmented block on the dismantled column pier: Based on the verification analysis, determine the cutting surface and hoisting hole position, and use an aerial work platform to mark the position on the dismantled column pier. S3: Drill holes using a water drill according to the marked lifting hole positions; S4: Use steel wire rope to thread through the hoisting hole and tighten it with manual hoists at both ends: Use steel wire rope of appropriate specifications that has been verified and confirmed, thread it through the hoisting hole, and connect manual hoists at both ends with rope clamps and tighten it. S5: Based on the cutting surface position marked in step S2, after installing the wire saw guide wheel, chain, and wire saw cutting equipment, connect the water and power supply, and perform cutting and separation from the outside to the inside: first cut horizontally, then separate vertically; perform cutting and separation. S6: Using a steel wire rope and a manual hoist, the cutting block is slowly lowered to the ground with the help of a human operator; S7: Repeat the previous steps until the column is completely removed.

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