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CN-122013716-A - Pier dismantling construction method

CN122013716ACN 122013716 ACN122013716 ACN 122013716ACN-122013716-A

Abstract

The invention relates to the technical field of wharf construction, in particular to a wharf dismantling construction method. The dock dismantling construction method comprises the steps of firstly completing special scheme approval and administrative permission, realizing construction resource in place, checking special equipment qualification and special operation personnel credentials, researching and reading old dock completion drawings, constructing a precise cutting model, tamping construction foundation, then dispatching ships by special persons, accurately positioning and calibrating floating ships through anchor ships, guaranteeing stable water operation benchmarks, hierarchically and separately dismantling various facilities, avoiding structural instability, uniformly transferring dismantling components to land storage and crushing, realizing resource utilization, carrying out dynamic inspection in the whole process, and standardizing inspection after completion. According to the method, through a standardized flow, an accurate process and full-period management and control, the multi-link safety risk is avoided, the construction efficiency is improved, the construction period is shortened, the resource utilization and the ecological protection are considered, and the engineering safety, the high efficiency and the green completion are ensured.

Inventors

  • CAI XIANGLONG
  • QIAN YANG
  • ZHANG RUNYU
  • SHI CHAOYI

Assignees

  • 中交二航局第三工程有限公司

Dates

Publication Date
20260512
Application Date
20260316

Claims (10)

  1. 1. The dock dismantling construction method is characterized by comprising the following steps of: The construction preparation method comprises the steps of 1, construction preparation, including scheme approval and handling, man-machine material positioning and wharf structure preparation, wherein the man-machine material positioning is required to check a special equipment related certificate and a special operation personnel certification, and the wharf structure preparation is required to analyze an old wharf related completion drawing and manufacture a cutting model; Step 2, vessel approach and station position, the vessel on the construction site is uniformly commanded and dispatched by special persons, and the floating crane vessel is anchored and positioned by the anchor lifting boat after moving to the construction position, and the hoisting and dismantling position is corrected; Removing wharf auxiliary facilities, steel bridge, piers, ship berthing facilities and pile foundations according to a preset sequence, wherein the removal sequence is old working ship berths, old approach bridges and main wharf ends, main wharfs and residual structures, anti-collision steel pipe piles and compensator piers on two sides of the approach bridges and transformer substation piers; Step 4, demolishing objects, namely, carrying the demolishing objects to a temporary storage point of a land area, and then carrying out chiseling and resource utilization; and 5, checking and accepting according to requirements in the construction process and after the construction is completed.
  2. 2. The dock demolition construction method according to claim 1, wherein the dock structure preparation in step 1 further comprises rechecking the overall dimensions, quality, number, pre-holes, embedded parts and hanging points of each part of the dock structure, and checking the reliability of the supporting structure and whether surrounding sundries obstruct demolition and hanging.
  3. 3. The pier dismantling construction method according to claim 1, wherein when the steel bridge is dismantled in the step 3, firstly, the connection condition of the steel bridge and a pier is checked, if the connection condition exists, the steel bridge is cut and separated through a plasma cutting machine, then the steel bridge is hoisted to the outside of a transport ship by adopting a floating crane, and the steel bridge on the transport ship is symmetrically arranged along the ship direction.
  4. 4. The pier removing construction method according to claim 1, wherein in the pier removing step 3, concrete ropes are used for sawing blocks along the middle position of the pile foundation, the weight of the single blocks after the blocks are partitioned is controlled to be 70-90t, the cutting lines avoid the pile foundation, the last row of concrete blocks are bilaterally symmetrical and supported by not less than two pile foundations, and the cut concrete blocks are hoisted to the rest of the pier or barge through a floating crane to be further decomposed and then transported out of the yard.
  5. 5. The pier demolishing construction method according to claim 1, wherein when demolishing pile foundation in step 3, PHC piles and cast-in-place piles are demolished to designed elevation by adopting rope sawing, steel pipe piles are demolished by adopting a cutting process, if the pile piles cannot be demolished by adopting a floating crane matched with a vibrating hammer, sludge around the pile body is cleaned by a diver before cutting by using a high-pressure water gun.
  6. 6. The pier demolishing construction method according to claim 1, characterized in that when demolishing the substation and partial approach bridge in step 3, the substation adopts an excavator to demolish for brick-concrete structure, the hollow slab beam body of the approach bridge and compensator is split by a floating crane after being cut into blocks by rope saw, and the area which can not be reached by the floating crane is crushed and slag removed in situ by the excavator arranged on the bridge deck.
  7. 7. The dock demolishing construction method according to claim 1, wherein when the demolishing operation in the step 3 adopts a diamond wire saw for cutting, the position of a cutting section is determined, a hoisting hole and a wire threading hole are drilled, a fixed guide wheel and a wire saw are installed, an operation system is connected, the running linear speed of the diamond wire is ensured to be 20+/-5 m/s during the cutting process, and sufficient circulating cooling water is supplied.
  8. 8. The dock demolishing construction method according to claim 1, wherein in the step 3, before the hoisting operation, parts such as a crane pulley, a sling, a clasp and the like are required to be inspected, when the crane is hoisted, the parts are firstly hoisted 200-300 mm away from the ground, then the crane is stopped, stability, reliability of a braking device and the like are inspected, when the crane is hoisted, a hull is required to be firmly anchored during the floating operation, the sling is firmly hung, the lifting hook is strictly forbidden to carry out the hoisting operation by transverse lifting and single angle stranding, and the hoisting operation is forbidden in high wind weather of six stages or more.
  9. 9. The dock demolishing construction method of claim 1, wherein in the demolishing treatment in the step 4, the technical safety bottoming, equipment maintenance and lighting facility installation are required to be completed before the concrete block is crushed, the station spacing of the excavator in the crushing process is larger than the operation radius of the excavator by 10m, the risk of cross operation is avoided, waste oil and waste liquid are intensively stored, the cutting slurry is collected and precipitated through a special container, the precipitated slurry is discharged after being filtered by geotextile, and the precipitate is transported and disposed.
  10. 10. The dock demolishing construction method according to claim 1, characterized in that in the construction process, a construction water area is defined, a warning boat is respectively arranged near the upstream and downstream 200m of the construction water area, an emergency tug is arranged on the construction site, the construction boat displays a signal lamp and a signal type according to the regulations, buoys with self-lighting lamps are tied on 50m lines on anchor chains, a construction communication network is established through very high frequency water channels, and the smooth connection of the banks is ensured.

Description

Pier dismantling construction method Technical Field The invention relates to the technical field of wharf construction, in particular to a wharf dismantling construction method. Background The wharf is used as an amphibious transportation hub, and after long-term operation, the wharf needs to be dismantled and rebuilt due to structural aging, function upgrading, channel planning and adjustment and other reasons. The dock demolishing engineering belongs to a subsection project with larger danger, relates to a plurality of high-risk procedures such as water operation, overhead operation, hoisting, cutting and crushing and the like, is positioned in important water areas such as Yangtze river and the like, has complex construction environment, and provides strict requirements for construction safety, navigation safety and ecological environment protection. In the existing dock dismantling construction, the problems that the dismantling sequence lacks scientific planning, the structure is easy to collapse due to instability, especially for a dock comprising a main dock, a working ship berth, a bridge approach, a substation and other multi-structure combinations, the unordered dismantling is easy to cause interlocking safety risks, the dismantling process is not targeted, the construction efficiency is low due to the fact that an adaptive cutting and hanging dismantling mode is not adopted for different types of components (such as a steel bridge, a concrete pier, PHC piles and steel pipe piles), damage is easy to be caused to residual structures or surrounding environments, the lifting operation is not in place due to the fact that safety control is not in place, the anchoring of a water floating crane station is not firm, the hoisting process is not standard, and the like are easy to cause safety accidents such as lifting injury and object hitting, the environment protection and navigation guarantee measures are not perfect, the cutting mud is easy to pollute the water body at will, the construction water area is not provided with effective communication and communication is difficult to influence the ship navigation safety. In addition, the dock dismantling construction also faces the complex influence of natural environment, such as weather of plum rain, typhoon, heavy fog and the like in the Yangtze river basin, and the restriction of water flow and geological conditions on underwater operation, so that the construction difficulty and risk are further increased. Meanwhile, the existing construction method has low resource utilization degree of demolishs, and part of recyclable components are not reasonably disposed, so that resource waste is caused. Therefore, there is a need for a dock dismantling construction method with standard flow, process adaptation, safety and controllability, and environment protection, which solves the problems of high safety risk, low construction efficiency, large environmental impact and the like in the existing construction by scientifically planning dismantling sequence, optimizing each component dismantling process, strengthening safety ring storage control and navigation guarantee measures, and ensures safe, efficient and environment-friendly implementation of dock dismantling engineering. In view of the above-mentioned drawbacks, the present designer has actively made researches and innovations in order to create a dock dismantling construction method, which has a more industrial value. Disclosure of Invention In order to solve the technical problems, the invention aims to provide a dock dismantling construction method. The invention discloses a dock dismantling construction method, which comprises the following steps: The construction preparation method comprises the steps of 1, construction preparation, including scheme approval and handling, man-machine material positioning and wharf structure preparation, wherein the man-machine material positioning is required to check a special equipment related certificate and a special operation personnel certification, and the wharf structure preparation is required to analyze an old wharf related completion drawing and manufacture a cutting model; Step 2, vessel approach and station position, the vessel on the construction site is uniformly commanded and dispatched by special persons, and the floating crane vessel is anchored and positioned by the anchor lifting boat after moving to the construction position, and the hoisting and dismantling position is corrected; Removing wharf auxiliary facilities, steel bridge, piers, ship berthing facilities and pile foundations according to a preset sequence, wherein the removal sequence is old working ship berths, old approach bridges and main wharf ends, main wharfs and residual structures, anti-collision steel pipe piles and compensator piers on two sides of the approach bridges and transformer substation piers; Step 4, demolishing objects, namely, carrying the demolishing objects to a t