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CN-122014028-A - Construction method for dismantling existing structure of open cut new line transfer station

CN122014028ACN 122014028 ACN122014028 ACN 122014028ACN-122014028-A

Abstract

The invention relates to the technical field of subway construction and discloses a construction method for dismantling an existing structure of an open cut new line transfer station, wherein a fully-closed fireproof fence is adopted to divide a reconstruction area on a longitudinal beam turning-up part of a bottom plate of an existing operation subway station, a semi-automatic walking type lifting truss and a fixed type lifting truss are assembled by utilizing a line outage period, matched channel steel guide rails are paved, and the fixed type truss is arranged at a reserved lifting hole of a new line; then cutting the existing structure of the transformation area in blocks, forming lifting holes, translating the concrete cutting blocks to reserved lifting holes through the walking type truss, and then lowering the concrete cutting blocks to a new station transfer point through the fixed truss to finish outward transportation. According to the invention, double trusses are adopted for cooperative operation, so that stable transportation of concrete cutting blocks in vertical and horizontal directions is realized, the potential safety hazard and operation difficulty of dismantling existing structures in a closed narrow environment are effectively solved, the dismantling efficiency is obviously improved on the premise of ensuring construction safety, and the interference degree of construction on the operation of existing subways is reduced.

Inventors

  • GAO QIANG
  • DONG CHANGMING
  • ZHENG GUOLEI
  • Wen Kangming

Assignees

  • 中铁隆工程集团有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The construction method for dismantling the existing structure of the open cut new line transfer station is characterized by comprising the following steps of: step 1, dividing a transformation area on a station bottom plate longitudinal turning beam (1) of an existing operation line subway station through a full-enclosed fireproof enclosure (2); Step 2, assembling a semi-automatic walking type lifting truss (6) and a fixed type lifting truss (7) at the approach of a line outage period and paving a channel steel guide rail (5), wherein a travelling wheel (11) is arranged at the bottom of the semi-automatic walking type lifting truss (6), the travelling wheel (11) is matched with the channel steel guide rail (5) paved in a transformation area, and the fixed type lifting truss (7) is arranged at a position of a reserved lifting hole of a new line station; step 3, cutting the existing structure in the reconstruction area in blocks and forming hoisting holes; And 4, driving the semi-automatic walking type lifting truss (6) to move, translating the concrete cutting block (3) cut in the step 3 to the position of the reserved lifting hole, lifting and lowering the concrete cutting block (3) to a transfer site of a new station through the fixed type lifting truss (7), and completing integral outward transportation.
  2. 2. The construction method for dismantling existing structures of open cut new line transfer stations according to claim 1, wherein the semi-automatic walking type hoisting truss (6) and the fixed hoisting truss (7) are all prefabricated components of separate units, and each unit is quickly assembled with bolts through flange plates.
  3. 3. The construction method for dismantling the existing structure of the open cut new line transfer station according to claim 1, wherein a hoisting main beam (21) of the semi-automatic walking type hoisting truss (6) is provided with a movable round steel hoisting ring (12) and an electric guide chain (10), and the electric guide chain (10) is connected with a hoisting hole on the concrete cutting block (3) through a hoisting belt (13) so that the concrete cutting block (3) can vertically lift and transversely finely adjust along with the semi-automatic walking type hoisting truss (6).
  4. 4. The construction method for dismantling the existing structure of the open-cut new line transfer station according to claim 3 is characterized in that the semi-automatic walking type lifting truss (6) is formed by splicing an I-shaped steel upright post (19), a channel steel diagonal brace (20) and a lifting main cross beam (21), a walking wheel (11) is arranged at the bottom of the I-shaped steel upright post (19), a round steel lifting ring (12), an electric guide chain (10) and a lifting hook (24) are arranged on the lifting main cross beam (21), and all components are fixed with a connecting bolt (27) through a connecting steel plate (26).
  5. 5. The method for dismantling the existing structure of the new open cut line transfer station according to claim 3, wherein in the step 3, the concrete cutting block (3) is pre-hung and fixed on the electric guide chain (10) through the hanging belt (13) penetrating through the hanging hole before cutting, and then rope saw static cutting is performed.
  6. 6. The method for dismantling the existing structure of the open cut new line transfer station according to claim 1, wherein in the step 3, the existing structure is segmented according to the rated hoisting limit playback line of the semi-automatic walking hoisting truss (6), and the concrete cutting blocks (3) are numbered in sequence to determine the cutting sequence.
  7. 7. The construction method for dismantling the existing structure of the open cut new line transfer station according to claim 1, wherein the hoisting hole of the concrete cutting block (3) and the rope saw threading hole are formed through a water drilling and drilling process.
  8. 8. The construction method for dismantling the existing structure of the new open cut line transfer station according to claim 1, wherein after the concrete cutting block (3) is translated to a reserved lifting hole position, vertical lowering operation is independently completed by the fixed lifting truss (7).
  9. 9. The method for dismantling existing structures of open cut new line transfer stations according to claim 1, wherein the fixed hoisting truss (7) comprises a fixed hoisting truss cross beam (14) and fixed hoisting truss oblique support beams (15) connected to two ends of the fixed hoisting truss cross beam (14); The fixed hoisting truss inclined support beams (15) positioned at the end parts of the fixed hoisting truss beams (14) are arranged in pairs, the fixed hoisting truss beams (14) are welded with the fixed hoisting truss inclined support beams (15) through connecting plates, the fixed hoisting truss inclined support beams (15) are enclosed with fixed hoisting truss longitudinal connecting reinforcements (16), fixed hoisting lower truss transverse connecting reinforcements (17) and fixed hoisting upper truss transverse connecting reinforcements (18) to form stable hoisting support points, the hoisting support points guide hoisting of the concrete cutting blocks (3) to be lowered through driving components, and the rated bearing capacity of the fixed hoisting truss beams (14) is not lower than the maximum hoisting load of the semi-automatic walking type truss hoisting (6).
  10. 10. The method for dismantling an existing structure of an open cut new line transfer station according to claim 1, wherein the totally enclosed group fireproof enclosure (2) completely and physically isolates a reconstruction area from a non-construction area of an existing operation station.

Description

Construction method for dismantling existing structure of open cut new line transfer station Technical Field The invention relates to the technical field of subway construction, in particular to a construction method for dismantling an existing structure of an open cut new line transfer station. Background Along with the continuous development of urban rail transit, many cities are involved in the demand of double-line transfer and even three-line transfer in rail transit construction, and in the construction process of dismantling the structure of the existing operation line station in current transfer transformation, a mode of manually breaking pneumatic pick and matching with static cutting is adopted, and the translation, lowering and outward transportation of a concrete dismantling member are generally carried out by adopting a traditional mode of manually shifting steel wires to fall after waste rubber tires are paved under the member, and the construction area of the existing operation subway station is in a closed and narrow limited space. Disclosure of Invention Aiming at the problems that potential safety hazards exist in construction and safety accidents are easy to cause in the closed and narrow environment of the existing operation line station, the invention aims to provide a construction method for dismantling the existing structure of the new line transfer station by integrating a semi-automatic walking type lifting truss and a fixed lifting truss, the method realizes smooth dismantling of the concrete structure of the existing operation station at the transfer point of the newly-built station and the existing station, and translation of the concrete cutting block in the vertical and horizontal directions, avoids the difficulty and potential safety hazard of manually moving the concrete cutting block component in a closed and narrow environment, and improves the construction speed to the maximum degree under the condition of ensuring safety. The invention is realized by the following technical scheme: The construction method for dismantling the existing structure of the open cut new line transfer station comprises the following steps: step 1, dividing a transformation area on a longitudinal turning beam of a station bottom plate of an existing operation line subway station through a full-sealed group fireproof enclosure; step 2, assembling a semi-automatic walking type hoisting truss and a fixed hoisting truss and paving a channel steel guide rail in an approach mode in a line outage period, wherein walking wheels are arranged at the bottom of the semi-automatic walking type hoisting truss and are matched with the channel steel guide rail paved in a transformation area, and the fixed hoisting truss is arranged at a reserved hoisting hole position of a new line station; step 3, cutting the existing structure in the reconstruction area in blocks and forming hoisting holes; and 4, driving the semi-automatic walking type hoisting truss to move, translating the concrete cutting block cut in the step 3 to the position of the reserved hoisting hole, hoisting and lowering the concrete cutting block to a transfer place of a newly-built station through the fixed hoisting truss, and completing integral outward transportation. According to the method, physical isolation of a construction area and an existing operation station is achieved through the totally-enclosed fireproof enclosure, interference of construction on normal operation of a subway can be avoided, meanwhile, linkage operation of a semi-automatic traveling type hoisting truss and a fixed type hoisting truss is supported, mechanical transportation is achieved through cooperation of a channel steel guide rail and a traveling wheel, the traditional lagging technology of breaking and steel drill shifting dropping of an artificial pneumatic pick is effectively replaced, potential safety hazards of manually carrying concrete members in a confined and narrow limited space are eliminated to the greatest extent, construction safety risks are reduced, meanwhile, the method can reasonably divide the existing structure into blocks according to hoisting weight limit, the pre-hoisting fixing and rope saw static cutting technology is matched, the size of a single concrete cutting block is remarkably improved, the dismantling operation efficiency is reduced, labor investment and construction cost are reduced, the truss adopts a single unit prefabricating and on-site rapid assembly mode, line outage period entering construction is combined, construction period can be compressed to the greatest extent, integral advancing speed of a new line and the existing line transfer and transformation engineering is accelerated, and the existing structure dismantling and outer transportation operation with safety, high efficiency and low interference are achieved. As a further scheme of the existing structure dismantling construction method, in order to solve the probl