CN218562255U

CN218562255U - Cofferdam structure of weir crest self-collapsing overflow

Info

Publication number: CN218562255U
Application number: CN202222507215.5U
Authority: CN
Inventors: 王璟玉; 蒲宁; 徐玲君; 文波; 熊玮
Original assignee: PowerChina Huadong Engineering Corp Ltd; Zhejiang Huadong Engineering Construction Management Co Ltd
Current assignee: PowerChina Huadong Engineering Corp Ltd; Zhejiang Huadong Engineering Construction Management Co Ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-03-03
Anticipated expiration: 2032-09-20

Abstract

The utility model provides a cofferdam structure with a self-collapsing weir crest overflow, which comprises a cofferdam weir body and an overflow channel extending from the top of the cofferdam weir body to a downstream weir foot; the upstream side of the cofferdam weir body is provided with an anti-seepage body, the anti-seepage body comprises clay inclined walls filled at the lower part and first clay straw bales filled at the middle part and two sides of the upper overflow channel, and the downstream of the anti-seepage body is filled with rock ballast; filling a second clay straw bag and clay seepage prevention in the inlet section of the overflow channel along the water flow direction in sequence, wherein the overflow channel is positioned at the downstream side of the second clay straw bag and is provided with a slope; and a precast concrete block protection is arranged in the downstream section of the overflow channel. According to the technical scheme, the weir crest is communicated with the downstream weir foot, the overflow channel is arranged, the drainage of the overproof flood is facilitated, and the cofferdam body is not damaged; a water retaining part is arranged at the inlet of the overflow channel and can be automatically broken when encountering overtopping; and protective structures are arranged at the bottom and two sides of the overflow channel to prevent the weir body from being damaged by scouring during water flow discharge.

Description

Cofferdam structure of weir crest self-collapsing overflow

Technical Field

The utility model belongs to the technical field of the cofferdam, concretely relates to cofferdam structure of weir crest overflow from bursting.

Background

Water conservancy and hydropower engineering construction usually needs to set up cofferdam structure manger plate in the riverbed to ensure foundation ditch dry land construction condition, guarantee construction quality, safety and the time limit for a project of main building. The earth-rock cofferdam structure is most widely applied due to the characteristics of convenient material acquisition, high construction speed, high structural reliability, low investment and the like.

The current earth-rock cofferdam usually adopts the annual cofferdam structural style, and has the following problems:

once the earth-rock cofferdam is overtime flood overtop, the earth-rock cofferdam is easily flushed and destroyed integrally, the water stored at the upper stream of the cofferdam and a large amount of earth-rock generated by the instant collapse of the cofferdam rush out, a foundation pit can be flushed, and great threat is caused to the life safety and property safety of downstream personnel. However, in recent years, the el nino phenomenon causes frequent extreme climate, and the phenomenon of river channel flood swelling and bursting caused by short-term strong rainfall occurs frequently, so that it is obvious that the sudden situation that the flood overflows the weir crest during the water retaining period of the conventional cofferdam is very easy to occur, thereby significantly increasing the risk caused by the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the shortcoming that exists among the prior art, provide one kind and meet with super standard flood and can realize the cofferdam structure of the weir top from the overflow of bursting, when overflow channel protection cofferdam overall structure through the formation, super standard flood can also be in the same direction as the smooth-going letdown of channel, greatly reduces the destruction to the low reaches.

In order to realize the purpose, the utility model adopts the technical scheme as follows:

a cofferdam structure with a self-bursting overflow weir crest comprises a cofferdam weir body and an overflow channel which is arranged from the top of the cofferdam weir body to a downstream weir foot; the upstream side of the cofferdam weir body is provided with an anti-seepage body, and the anti-seepage body comprises clay inclined walls filled at the lower part and first clay grass bags filled at the middle part and two sides of the overflow channel at the upper part; fill in proper order along the rivers direction in the overflow channel entrance and build second clay bale and clay prevention of seepage, just the overflow channel is located the downstream side of second clay bale sets up the slope.

Furthermore, first clay grass package loads respectively in a plurality of steel reinforcement cages, the steel reinforcement cage welds each other for a whole.

Further, gaps between the first clay bales are filled with clay and tamped.

Furthermore, the elevation of the weir crest at the inlet section of the overflow channel is lower than the elevation of the weir crest of the weir bodies at two sides of the inlet section of the overflow channel.

Furthermore, the downstream of the seepage-proofing body is filled with stone ballast.

Furthermore, the downstream section of overflow channel arranges precast concrete piece protection, wherein is located two neighbours of overflow channel downstream section bottom plate be equipped with protruding structure between the precast concrete piece, be located overflow channel downstream section side slope the precast concrete piece is the echelonment and arranges.

Furthermore, the upstream side of clay skew wall adopts the protection of dry masonry bank protection.

Compared with the prior art, the beneficial effects of the utility model are as follows:

(1) When the over-standard flood does not occur, the cofferdam can normally retain water according to the design standard.

(2) Once the cofferdam is subjected to over-standard flood, overtopping is caused, and self-bursting overflow can be realized on the weir crest, so that the safety of the main structure of the cofferdam is protected, and the engineering loss is reduced; on the other hand, standard flood can smoothly flow down through the overflow channel, and the damage to the downstream is reduced.

(3) The self-bursting overflow in case of sudden flood can effectively reduce the loss caused by bad response measures caused by human factors.

(4) After the inlet of the overflow channel is automatically burst and overflows, the water can be retained again by simply repairing the inlet after the flood is finished.

Drawings

Fig. 1 is a typical cross-sectional view of the present invention.

Fig. 2 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 1.

Fig. 3 is a sectional view taken along line B-B of fig. 1.

Fig. 4 is a cross-sectional view taken along line C-C of fig. 1.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Reference is made to the accompanying drawings. The cofferdam structure comprises a cofferdam body 10 and an overflow channel 20 which extends from the top of the cofferdam body to the bottom of a downstream weir foot. Wherein, the inlet section of the overflow channel 20 is provided with a water retaining structure capable of self-collapsing, and the bottom and two sides of the overflow channel 20 are provided with protective structures.

Specifically, the upstream side of the cofferdam weir body 10 is provided with an anti-seepage body, and the anti-seepage body comprises clay inclined walls 5 filled at the lower part of the upstream side and first clay grass bags 3 filled at the middle part of the upstream side and two sides of an upper overflow channel. The upstream side of the clay inclined wall 5 is protected by dry masonry slope protection, and the downstream of the seepage-proofing body is filled by stone slag 4. In order to prevent the first clay straw bales 3 from being scoured and destabilized, the first clay straw bales 3 are respectively arranged in the reinforcement cages, all the reinforcement cages are welded into a whole, gaps among the clay straw bales 3 are filled with clay and tamped, so that a stable anti-seepage body is formed, and the cofferdam weir body 10 is protected from being scoured and damaged when water flows are discharged.

The water retaining structure comprises a second clay bale 1 and clay 2 which are sequentially arranged along the water flow direction. In particular, the downstream side of the second clay bale 1 is provided with a slope, so that once the downstream clay 2 at the position is washed away, the second clay bale 1 is instable, and self-bursting overflow is formed. And because the bottom plate of the inlet section of the overflow channel 20 and the side walls at the two sides are the first clay bale 1, the overflow channel can stably discharge. The bottom plate of the downstream section of the overflow channel 20 is protected by precast concrete blocks 6, and a protruding structure is arranged between the two precast concrete blocks 6, so that the anti-seepage and the integral stability of the channel are facilitated. And the side slope at the downstream section of the overflow channel is protected by adopting precast concrete blocks 7 in a step-shaped arrangement.

The elevation of the weir crest at the inlet part of the overflow channel 20 is slightly lower than that of the weir crest at the two sides of the overflow channel.

The implementation method of the embodiment is as follows:

step a: and arranging a cofferdam at a proper position in the river bed.

Step b: and after site selection is completed, filling the weir body stone slag 4.

Step c: and filling the lower impermeable clay inclined wall 5.

Step d: and (3) constructing an upper anti-seepage body, paving a reinforcement cage in a layering manner before construction, filling first clay straw bags 3 in the reinforcement cage, and filling and tamping gaps among the first clay straw bags 3 with clay.

Step e: and paving the precast concrete blocks 6 and 7 of the bottom plate of the overflow channel.

Step f: filling of the inlet section clay 2 of the overflow channel 20 and the second clay bale 1 is performed.

It should be noted that the above describes exemplifying embodiments of the invention. However, it should be understood by those skilled in the art that the present invention is not limited to the above embodiments, which are only used for illustrating the principle of the present invention, and that various changes and modifications may be made without departing from the scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A cofferdam structure with a self-collapsing weir crest comprises a cofferdam weir body and is characterized by also comprising an overflow channel which is arranged from the top of the cofferdam weir body to a downstream weir foot; the upstream side of the cofferdam weir body is provided with an anti-seepage body, and the anti-seepage body comprises clay inclined walls filled at the lower part and first clay grass bags filled at the middle part and two sides of the overflow channel at the upper part; fill second clay straw bale and clay prevention of seepage in proper order along the rivers direction in the overflow channel entrance, just the overflow channel is located the downstream side of second clay straw bale sets up the slope.

2. A cofferdam structure of weir crest self-collapsing overflow as claimed in claim 1, wherein said first clay sod bales are loaded in a plurality of reinforcement cages respectively, said reinforcement cages being welded to each other as one body.

3. A cofferdam structure of a weir crest self-collapsing overflow as claimed in claim 2, wherein the gaps between said first clay buns are filled with clay and tamped.

4. A weir crest self-collapsing overflow weir structure according to claim 1 wherein the elevation of the weir crest at the inlet section of the overflow channel is lower than the elevation of the weir crest on either side of the inlet section of the overflow channel.

5. A weir crest self-collapsing overflow cofferdam construction as claimed in claim 1 wherein the downstream of said barrier is ballast fill.

6. A cofferdam structure of a weir crest self-collapsing overflow according to any one of claims 1 to 5, wherein precast concrete block guards are arranged in the downstream section of said overflow channel.

7. A cofferdam structure of the weir crest self-collapsing overflow of claim 6 wherein a raised structure is provided between two adjacent said precast concrete blocks at the floor of the downstream section of said overflow channel.

8. A cofferdam structure of a weir crest self-collapsing overflow as claimed in claim 6 wherein said precast concrete blocks located on the side slope of the downstream section of said overflow channel are arranged in a step-like manner.

9. A cofferdam structure of weir crest self-collapsing overflow of claim 6, wherein the upstream side of said clay inclined wall is protected by dry masonry revetment.