Rapid construction method and formwork of concrete cofferdam under dynamic water environment

A technology of concrete cofferdam and construction method, applied in water conservancy engineering, marine engineering, hydropower generation and other directions, can solve the problems of occupying a large area of ​​the river, not easy, reducing power generation efficiency, etc.

Active Publication Date: 2021-04-27
CHINA GEZHOUBA (GRP) FIRST ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this project, the power station has been put into operation for power generation during reconstruction and construction, and the outlet of the super spillway after reconstruction is located less than 50m downstream of the outlet of the tail water of the power station, close to the downstream of the sill of the deep hole spillway outlet that has been put into use, and earth-rock cofferdams are used The construction has the following problems: (1) Occupying a large area of ​​the river channel is likely to cause blockage of the river channel and the height of the river water will affect the tail water output and reduce the power generation efficiency; (2) During the reconstruction of the special flood discharge tunnel, the deep hole flood discharge tunnel needs to discharge the flood for a long time, and the waves are high and the water is urgent , the earth-rock cofferdam has great safety hazards, and the construction safety of the extraordinary flood discharge tunnel reconstruction cannot be guaranteed; (3) From the earth-rock cofferdam filling to the cofferdam upstream surface reinforcement, to the final cofferdam demolition, the construction period is long and the construction cost is high
But this scheme is difficult to apply in the working condition that road hoisting is not easy in this application

Method used

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  • Rapid construction method and formwork of concrete cofferdam under dynamic water environment
  • Rapid construction method and formwork of concrete cofferdam under dynamic water environment
  • Rapid construction method and formwork of concrete cofferdam under dynamic water environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Such as figure 1 As shown in , the cross-sectional size of diversion tunnel 2 is 13×15m, width×height, and the city gate type. The outlet of the diversion tunnel is a trapezoidal open channel. Due to the terrain, the construction of the cofferdam is difficult. Earth-rock cofferdams have many problems such as occupying a large area of ​​the river, easily causing blockage of the river, high water level, large construction cost and long construction period. Concrete cofferdams have construction facilities and difficulties in hoisting, such as inconvenient road traffic, and it is difficult for large-scale truck cranes to reach the construction site, and the design flow of the site is 1960m 3 / s, the water pressure difference between the upstream and downstream is relatively large, and the construction difficulty is relatively high.

[0043] In order to overcome the above difficulties such as figure 1 , 2 Among them, a rapid construction method for concrete cofferdams un...

Embodiment 2

[0063] Such as Figure 1~6 Among them, an underwater steel truss formwork used in the above-mentioned rapid construction method for concrete cofferdams under dynamic water environment, it includes two panels 31 arranged oppositely, the panels are made of 2.5mm steel plates, and a truss structure 32 is arranged between the panels 31, The back side of the panel 31 is provided with a vertical enclosure 33 and a horizontal enclosure 34 fixedly connected to the panel 31; the vertical enclosure 33 adopts channel steel, and the horizontal enclosure 34 adopts angle steel.

[0064] In a preferred solution, the underwater steel truss template is divided into multiple sections from top to bottom, and is hoisted in sections during the hoisting process; as figure 1 Among them, it is divided into upper template 3 and lower template 4.

[0065] There is a gap between the two ends of the panel 31 and the open channel slope 5, the gap width is 5-20cm, preferably 15cm, and at the two ends of t...

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Abstract

The invention provides a concrete cofferdam rapid construction method and formwork in a dynamic water environment, formwork processing, processing underwater construction formwork according to the cross-sectional shape of the open channel at the outlet of the diversion tunnel; laying a Bailey bridge on the top side of the open channel pouring construction ( 1) As a material receiving and auxiliary construction platform; the formwork is hoisted in sections into the open channel and fixed; the arrangement of the receiving hopper and the conduit; underwater concrete pouring; through the above steps, the rapid construction of the concrete cofferdam under the flowing water environment is realized. The formwork includes two oppositely arranged panels, a truss structure is set between the panels, there is a gap between the two ends of the panels and the slope of the open channel, and a flexible grout is provided between the two panels at the two ends of the panels; on the formwork There is also a flat pressure pipe connecting the upstream and downstream. The invention overcomes the technical problem that it is difficult to hoist corresponding construction equipment at the outlet of the diversion tunnel.

Description

technical field [0001] The invention relates to the field of cofferdam construction of water conservancy and hydropower projects, in particular to a rapid construction method and formwork for concrete cofferdams in a dynamic water environment. Background technique [0002] During the construction of a super-high face dam hydropower station in a narrow canyon with deep silt and thick overburden, it is necessary to arrange a year-round water-retaining cofferdam in the open channel at the outlet of the diversion tunnel for the construction of converting the diversion tunnel into a super-spill tunnel. [0003] According to the previous construction experience of similar projects, when the diversion tunnel is converted into a permanent hydraulic tunnel, the water retaining cofferdam is generally filled with earth-rock cofferdam outside the construction area of ​​the original diversion tunnel outlet, and the water-facing surface of the earth-rock cofferdam is reinforced. The earth...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): E02D19/04E02B9/06E02D15/06E02B8/06
CPCE02B8/06E02B9/06E02D15/06E02D19/04Y02E10/20
Inventor李远运唐珂童杰杨小华李红心张旭马俊罗磊李世凯严波
OwnerCHINA GEZHOUBA (GRP) FIRST ENG CO LTD