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CN-121976570-A - Suspended box cofferdam prefabricated bottom plate serving as construction platform water stopping structure and construction method

CN121976570ACN 121976570 ACN121976570 ACN 121976570ACN-121976570-A

Abstract

The application discloses a water stop structure and a construction method for a prefabricated bottom plate of a suspended box cofferdam serving as a construction platform, wherein the water stop structure comprises a prefabricated concrete bottom plate and a steel upright post, an avoidance hole for the steel upright post to pass through is formed in the prefabricated concrete bottom plate, an annular bracket is sleeved on the steel upright post and positioned below the prefabricated concrete bottom plate, a first waterproof piece is arranged on the inner wall of the annular bracket, a second waterproof piece is arranged between the annular bracket and the prefabricated concrete, and an installation seat connected with the annular bracket is connected to the steel upright post. The precast concrete bottom plate can be used as a construction platform, procedures such as drilling can be carried out, after construction of other procedures is finished, the precast concrete bottom plate is lowered to the subsurface, the precast concrete bottom plate is used as a bottom plate of a cofferdam structure, the mounting seat enables annular brackets to be attached to the bottom surface of the precast concrete bottom plate, the first waterproof piece and the second waterproof piece can work conveniently, waterproof mortar is conveniently poured into avoidance holes, and waterproof performance between the precast concrete bottom plate and the steel upright is guaranteed.

Inventors

  • ZHOU WEN
  • ZHENG ZHEN
  • WANG JIE

Assignees

  • 中铁广州工程局集团有限公司

Dates

Publication Date
20260505
Application Date
20260202

Claims (10)

  1. 1. The utility model provides a lift box cofferdam prefabricated bottom plate is construction platform stagnant water structure concurrently, its characterized in that, including precast concrete bottom plate (1) and steel stand (2), be equipped with on precast concrete bottom plate (1) and supply dodge hole (11) that steel stand (2) passed, steel stand (2) are gone up to overlap and are equipped with annular bracket, annular bracket is located precast concrete bottom plate (1) below, be equipped with the water-proof tank on the inner wall of annular bracket, be equipped with first waterproof piece (31) in the water-proof tank, be equipped with second waterproof piece (32) between annular bracket and the precast concrete, be connected with mount pad (21) on steel stand (2), mount pad (21) are located precast concrete bottom plate (1) top; When the precast concrete base plate (1) is positioned above the water surface, the annular bracket (3) is fixedly connected with the steel upright post (2); when the precast concrete bottom plate (1) is positioned below the water surface, the annular bracket (3) is disconnected with the steel upright post (2), and the annular bracket (3) is connected with the mounting seat (21).
  2. 2. The prefabricated bottom plate of the suspended box cofferdam and serving as a construction platform water stopping structure according to claim 1, wherein the installation seat (21) is provided with a connecting piece (22), the connecting piece (22) is provided with a suspender (23), and one end of the suspender (23) far away from the connecting piece (22) penetrates through the avoidance hole (11) and is connected with the annular bracket (3).
  3. 3. The prefabricated bottom plate of the suspended box cofferdam and as construction platform water stopping structure of claim 2, wherein the connecting piece (22) adopts a penetrating jack.
  4. 4. The prefabricated bottom plate of the suspended box cofferdam and serving as a construction platform water stopping structure according to claim 1, wherein the first waterproof piece (31) adopts an annular air bag, the second waterproof piece (32) adopts an annular rubber strip, and the annular rubber strip is arranged on the annular bracket (3) through a pressing plate (33).
  5. 5. The prefabricated bottom plate of the suspended box cofferdam and as construction platform water stopping structure of claim 3, wherein when the prefabricated concrete bottom plate (1) is lowered, the penetrating jack controls the boom (23) to be lowered synchronously.
  6. 6. The prefabricated bottom plate of the suspended box cofferdam and as construction platform water stopping structure of claim 1, wherein a jacking rod (24) is arranged between the prefabricated concrete bottom plate (1) and the mounting seat (21), and the jacking rod (24) applies downward pressure to the prefabricated concrete bottom plate (1).
  7. 7. The prefabricated bottom plate of the suspended box cofferdam and as a construction platform water stopping structure according to claim 6, wherein the prefabricated concrete bottom plate (1) is connected with a reinforcing framework, the reinforcing framework comprises a plurality of reinforcing cross bars (12) and reinforcing longitudinal bars (13), the reinforcing cross bars (12) and the reinforcing longitudinal bars (13) are attached to the prefabricated concrete bottom plate (1), side dies (14) are connected to the side surfaces of the prefabricated concrete bottom plate (1), the side dies (14) are circumferentially arranged along the prefabricated concrete bottom plate (1), and the side dies (14) are connected with the reinforcing cross bars (12) or the reinforcing longitudinal bars (13).
  8. 8. The prefabricated bottom plate of the suspended box cofferdam also serving as a construction platform water stopping structure according to claim 1, wherein the annular bracket (3) adopts a split structure, and when the prefabricated concrete bottom plate (1) is positioned above a water surface, the annular bracket (3) is connected with the steel upright post (2) by adopting a high-strength bolt.
  9. 9. A construction method based on the prefabricated bottom plate of the suspended box cofferdam as a construction platform water stopping structure as set forth in any one of claims 1-8, which is characterized by comprising the following steps: S1, constructing a pile foundation on the seabed, and constructing a steel upright post (2) on the pile foundation; S2, hoisting the annular bracket (3) and the precast concrete base plate (1) through hoisting equipment, and installing the annular bracket (3) and the precast concrete base plate (1) on the steel upright post (2); s3, constructing other working procedures by using the precast concrete base plate (1) as a construction platform; S4, after construction of other working procedures is completed, the annular bracket (3), the precast concrete base plate (1) and the steel upright posts (2) are removed, the precast concrete base plate (1) is lowered to the position below the water surface through hoisting equipment, and the precast concrete base plate (1) is used as a base plate of a cofferdam; s5, connecting the mounting seat (21) with the annular bracket (3), and pouring waterproof mortar in the avoidance hole (11).
  10. 10. A construction method according to claim 9, wherein in step S2, the precast concrete segments are hoisted one by one while the precast concrete base plate (1) is hoisted, and then adjacent precast concrete segments are joined by wet joints to form the precast concrete base plate (1).

Description

Suspended box cofferdam prefabricated bottom plate serving as construction platform water stopping structure and construction method Technical Field The application relates to the technical field of cofferdam construction, in particular to a water stopping structure with a prefabricated bottom plate of a suspended box cofferdam serving as a construction platform and a construction method. Background When the marine cofferdam is constructed, a steel bottom plate is generally adopted in a traditional mode, but the cost of the mode is high, so that precast concrete bottom plates are adopted in many projects at present. Hole sites are reserved on the bottom plate for the steel upright posts to pass through, when the steel bottom plate is adopted, the waterproof can be realized between the bottom plate hole sites and the steel upright posts through a welding sealing structure, but after the precast concrete bottom plate is adopted, the waterproof structure cannot be installed in a welding mode, so that the design and installation difficulty of the waterproof structure are increased. Disclosure of Invention The application aims to provide a water stopping structure and a construction method for a prefabricated bottom plate of a suspended box cofferdam serving as a construction platform, so as to solve the problem that a waterproof structure between a prefabricated concrete bottom plate and a steel upright post is difficult to install. In a first aspect, the prefabricated bottom plate of the suspended box cofferdam provided by the application also serves as a construction platform water stopping structure, and adopts the following technical scheme: The prefabricated bottom plate of the suspended box cofferdam is also used as a construction platform water stopping structure, and comprises a prefabricated concrete bottom plate and a steel upright post, wherein an avoidance hole for the steel upright post to pass through is formed in the prefabricated concrete bottom plate, an annular bracket is sleeved on the steel upright post, the annular bracket is positioned below the prefabricated concrete bottom plate, a waterproof groove is formed in the inner wall of the annular bracket, a first waterproof piece is arranged in the waterproof groove, a second waterproof piece is arranged between the annular bracket and the prefabricated concrete, an installation seat is connected onto the steel upright post, the installation seat is positioned above the prefabricated concrete bottom plate, when the prefabricated concrete bottom plate is positioned above the water surface, the annular bracket is fixedly connected with the steel upright post, and when the prefabricated concrete bottom plate is positioned below the water surface, the annular bracket is disconnected with the steel upright post, and the annular bracket is connected with the installation seat. Through adopting above-mentioned technical scheme, during the construction, precast concrete bottom plate is installed on the steel stand by the hoist and mount earlier, precast concrete bottom plate is located the surface of water, annular bracket and steel stand fixed connection support precast concrete bottom plate, precast concrete bottom plate is construction platform use this moment, supply engineering machine tool to enter the scene, can carry out the drilling, process such as installation side form, after other process construction finishes, demolish the connection of annular bracket and steel stand, then put precast concrete bottom plate under the surface of water, precast concrete bottom plate is as cofferdam structure's bottom plate this moment, and the mount pad is connected with annular bracket, make annular bracket and precast concrete bottom plate's bottom surface laminating, be convenient for first waterproof piece and second waterproof piece can work, and then be convenient for dodge downthehole waterproof mortar of pouring, waterproof nature between precast concrete bottom plate and the steel stand with guarantee. Optionally, be equipped with the connecting piece on the mount pad, be equipped with the jib on the connecting piece, the one end that the jib was kept away from the connecting piece passes and dodges the hole, is connected with annular bracket. Through above-mentioned technical scheme, connecting piece and jib cooperation, hold annular bracket, the bottom surface laminating of the waterproof piece of second and precast concrete bottom plate of being convenient for is convenient for overlap precast concrete bottom plate on the steel stand, also can remove for precast concrete bottom plate relative steel stand, so dodge the hole size and have certain surplus, can be 30 centimeters, and the jib then can utilize the design surplus who dodges the hole to realize being connected with annular bracket. Optionally, the connecting piece adopts a penetrating jack. Through above-mentioned technical scheme, the pull that the jack is convenient for adjust the j