Concrete cofferdam quick construction method and template under flowing water environment

A technology of concrete cofferdams and construction methods, which is applied in water conservancy projects, sea area projects, hydroelectric power generation, etc., can solve problems such as lower power generation efficiency, difficulty in applying road hoisting, and river channel blockage, and achieve the effect of improving water blocking effect

Active Publication Date: 2019-07-12
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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  • Concrete cofferdam quick construction method and template under flowing water environment
  • Concrete cofferdam quick construction method and template under flowing water environment
  • Concrete cofferdam quick construction method and template under flowing water environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 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.

[0044] In order to overcome the above difficulties such as figure 1 , 2 Among them, a rapid construction method for concrete cofferdams un...

Embodiment 2

[0064] Such as Figure 1~6 Among them, a formwork used for the above-mentioned rapid construction method of concrete cofferdams under dynamic water environment, it includes two panels 31 arranged oppositely, the panels are made of 2.5mm steel plates, a truss structure 32 is arranged between the panels 31, and the back of the panels 31 A vertical fence 33 and a horizontal fence 34 fixedly connected to the panel 31 are arranged; the longitudinal fence 33 adopts channel steel, and the horizontal fence 34 adopts angle steel.

[0065] In a preferred solution, the 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.

[0066] 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 the panel 31, a flexible slurry retaining body 35 is arranged betwee...

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Abstract

The invention provides a concrete cofferdam quick construction method and template under a flowing water environment. The concrete cofferdam quick construction method includes the steps that templateis machined, specifically, the underwater construction template is machined according to the cross section shape of an open channel of a diversion tunnel outlet; a bailey bridge (1) is distributed onone side of the top of open channel casting construction and taken as a platform for material receiving and auxiliary construction; the template is hoisted in a segmental mode into the open channel and fixed; a receiving hopper and a guiding pipe are distributed; and underwater concrete casting is conducted, concrete cofferdam quick construction under the flowing water environment is achieved through the steps. The template includes two panels distributed oppositely, a truss structure is arranged between the panels, gaps are formed between the two ends of the panels and a side slope of the open channel, and flexible slurry blocking bodies at the two ends of the panels are arranged between the two panels; and the template is further provided with flat pressing pipes communicating with the upstream and the downstream. According to the concrete cofferdam quick construction method and template, the technical difficult problem that corresponding construction equipment is difficult to hoistat the diversion tunnel outlet is solved.

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 & AuthorityApplications(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