CN1107770C - Gravity steel frame water-tight film braced cofferdam and its construction method - Google Patents
Gravity steel frame water-tight film braced cofferdam and its construction method Download PDFInfo
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- CN1107770C CN1107770C CN 00105646 CN00105646A CN1107770C CN 1107770 C CN1107770 C CN 1107770C CN 00105646 CN00105646 CN 00105646 CN 00105646 A CN00105646 A CN 00105646A CN 1107770 C CN1107770 C CN 1107770C
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Abstract
The present invention relates to a gravity type steel frame impervious membrane cofferdam which is characterized in that each sheet-shaped triangular steel frame is formed by connecting scaffold steel tubes and fasteners; sheet-shaped triangular steel frames are arranged in parallel in water, and are fixedly connected into a three-dimensional steel frame by transversal steel tubes; a steel moulding plate and an impervious membrane are fully laid on the upstream slope surface of the three-dimensional steel frame, and the impervious membrane is laid and extended to the bottom surface of the upper stream water in front of the three-dimensional steel frame. The present invention has the advantages that cofferdam material sources are wide, and the cofferdam materials can be reused; the present invention aims at a polluted water body, and is disassembled and assembled conveniently and rapidly; the construction is easy to master, and the manufacturing cost is lower; the present invention is suitable for building a cofferdam in a river or a lake of which the bottom is provided with an impermeable layer, such as a lining river or lake bottom, or a clay layer river or lake bottom; the present invention is also suitable for building a cofferdam in a river or a lake of which the water depth is less than 3m, the flow rate is 2 m/s, and the water level is stable.
Description
The invention belongs to construction of hydro project with the cofferdam of temporary water dash, particularly a kind of for keeping the cofferdam and the job practices thereof of the gravity steelframe antiseepage film structure that the dried groove construction of underwater structures dams.
For a long time, people are in lake, hydraulic engineering river regulation, when building the waterborne or artificial structure of cross a river (lake) under water, need dam on river course, lake, draining, and conventional method is to adopt heap to banket stone to build the cofferdam, block current, in the dried groove construction of cofferdam back side draining.Today, in the urban rivers and lakes improvement project, difficulty has Tu Yuan as the cofferdam material near the job site, and it is far away to fetch earth; Soil body cofferdam is bulky, takies a large amount of areas in lake, river, and soil body cofferdam material contamination river is removed time-consumingly, all becomes the difficulty in the construction.
The objective of the invention is, design and produce a kind of gravity steel frame water-tight film braced cofferdam and job practices thereof, promptly adopt sheet triangle steelframe and fastener set to dress up three-dimensional steelframe, lay the steel form panel at three-dimensional steelframe upstream face, the antiseepage film that paves relies on cofferdam structure and upper water body weight power to satisfy structure self balance and forms water-retaining cofferdam, light to reach structure, can install and remove fast, pollution-free to water body, the purpose that floor space is little.
Technical scheme of the present invention is following realization, a kind of gravity steel frame water-tight film braced cofferdam, form by sheet triangle steelframe, dash steel form and antiseepage film, sheet triangle steelframe is the monolithic triangle steelframe that scaffolding steel pipe and right-angle coupler, revolution fastener connect into, there is horizontal steel pipe fixedly connected between the monolithic triangle steelframe that is arranged in parallel, constitutes three-dimensional steelframe; On three-dimensional steelframe upstream batter face, completely spread steel form and fixing, the antiseepage film that paves on the steel form face, antiseepage film is extended shop to upper water bottom surface, three-dimensional steelframe the place ahead.
The vertical vertical rod of three-dimensional steelframe can followingly extend the supporting leg stake;
° are advisable in three-dimensional steelframe upstream batter face and ground angle≤26;
It is that depth of water 2-3 doubly is advisable that antiseepage film is extended shop to upper water bottom surface, three-dimensional steelframe the place ahead length;
The antiseepage film back side can be spread colour bar cloth earlier one;
Antiseepage film is the material of material flexibility, proportion 〉=1;
Steelframe can be used spherical threaded fastening means formula space net rack;
Steel form can be steel plate or rigidity backing plate.
Operating principle of the present invention is: three-dimensional steelframe is made the herringbone shape that upstream face is a slope shape, utilize the river gravity pressure to increase the frictional force of steelframe and river bed, and then balance river horizontal thrust that three-dimensional steelframe is produced, it is stable that light steel frame is issued at load action; During the back side draining, along with drawdown, the upstream face antiseepage film contacts closely with river bed, steel form under the effect of river pressure, forms impervious barrier, thereby stops seepage flow, plays the effect of damming.
The job practices of gravity steel frame water-tight film braced cofferdam of the present invention:
1, at installation on ground sheet triangle steelframe, according to the steelframe design size, utilize scaffolding steel pipe, right-angle coupler, revolution fastener, be assembled into monolithic triangle steelframe in advance on ground, be transported to the scene;
2, assemble three-dimensional steelframe on the water, with the monolithic triangle steelframe that assembles in advance, utilize buoyant raft to be transported to the cofferdam and set up on-the-spot water surface place, manually that its submerged is in place, be arranged in parallel, adopt horizontal steel pipe to connect each sheet steelframe part that surfaces fixing, the water surface is with the lower part, when treating downstream precipitation, fixing at any time with drawdown;
3, lay steel form and fixing at three-dimensional steelframe upstream upstream face, utilize buoyant raft that steel form is transported on the water surface, outside steel form light faces, on three-dimensional steelframe upstream batter face, lay, connect successively with snap ring, steel form after connecting is slided to river bed under water under three-dimensional steelframe upstream batter face, after being paved with, toggle steel form and steelframe fixing with galvanized wire;
4, the antiseepage film that paves on steel form, antiseepage film adopt hot sticky technology splicing, 10 centimetres of lap widths, and the antiseepage film back side is the one colour bar cloth in shop earlier, prevents the antiseepage film landing; The antiseepage film that splicing is good on the vacant lot according to the physical location following current in water to doubling, clot is transported to the cofferdam and is set up the scene; Utilize buoyant raft delivery antiseepage film, with the antiseepage film of the clot opposite bank that paves from a bank along the cofferdam axis, antiseepage film top one side is fixed on the three-dimensional steelframe, with the expansion that upstream stretches of another side of antiseepage film doubling, water-filling in the middle of the two-layer antiseepage film of doubling, another side of antiseepage film relies on the thrust of water-filling slowly to sink to the river bed, and contacts with the steel form and the bottom, in the sand pocket compacting of antiseepage film periphery;
5, pump drainage downstream water, along with drawdown, antiseepage film and river bed, steel form are adjacent to gradually, seepage flow ends, and the cofferdam begins to take shape, along with the level of tail water descends, it is fixing to adopt horizontal steel pipe that each sheet steelframe is connect, and promptly steelframe is carried out integral reinforcing, guarantees that the cofferdam is stable.
Advantage of the present invention is that the cofferdam material source is extensive, can reuse; Water body is not produced pollution; Convenient to disassembly, construction is grasped easily; Cost is lower.Be applicable to that there is impervious layer at the end, river (lake), as lining cutting river bed or argillic horizon river bed; In 3.0 meters of river (lake) water depths, flow velocity 2.0 meter per seconds are built the cofferdam in the metastable river of water level, the lake.
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the organigram of gravity steel frame water-tight film braced cofferdam of the present invention
Fig. 2 is the organigram that three-dimensional steelframe extends the gravity steel frame water-tight film braced cofferdam of supporting leg stake
Fig. 3 is the job practices flow chart of gravity steel frame water-tight film braced cofferdam of the present invention
As seen from Figure 1, the gravity steel frame water-tight film braced cofferdam of on the lining cutting riverbed, building, form by sheet triangle steelframe, steel form and antiseepage film, sheet triangle steelframe is the monolithic triangle steelframe 1 that scaffolding steel pipe, right-angle coupler, revolution fastener connect into, the horizontal steel pipe of fixed connection between the monolithic triangle steelframe that is arranged in parallel constitutes three-dimensional steelframe; It is also fixing completely to spread steel form 2 on three-dimensional steelframe upstream batter face, the PVC antiseepage film 3 that paves on the steel form face, and antiseepage film is extended shop to upper water bottom surface, three-dimensional steelframe the place ahead, and is peripheral with sand pocket 4 compactings in antiseepage film.Among the figure, 5 is the riverbed lining cutting.
As seen from Figure 2, the gravity steel frame water-tight film braced cofferdam of on natural clay layer riverbed, building, the vertical vertical rod of monolithic triangle steelframe 1 can extend supporting leg stake 6, inserts argillic horizon, and the fixed connection that is arranged in parallel constitutes three-dimensional steelframe; It is also fixing completely to spread steel form 2 on three-dimensional steelframe upstream batter face, the PVC antiseepage film 3 that paves on the steel form face, and antiseepage film is extended shop to upper water bottom surface, three-dimensional steelframe the place ahead, and is peripheral with sand pocket 4 compactings in antiseepage film.Among the figure, 7 is the natural stream channel argillic horizon, and 8 are load-bearing cement square brick.
As seen from Figure 3, the working procedure of gravity steel frame water-tight film braced cofferdam of the present invention:
The monolithic triangle steelframe that 3-1 will assemble in advance, submerged is in place, is arranged in parallel, and connects to be fixed into three-dimensional steelframe;
3-2 establishes steel form and fixing on three-dimensional steelframe upper berth, can adopt the P3015 steel form;
The 3-3 antiseepage film that paves on steel form is fixed in antiseepage film top one side on the three-dimensional steelframe, with the expansion that upstream stretches of another side of antiseepage film doubling, water-filling in the middle of the two-layer antiseepage film of doubling;
Another side of 3-4 antiseepage film relies on the thrust of water-filling slowly to sink to the river bed, and contacts with water-bed face and steel form;
3-5 is in the sand pocket compacting of antiseepage film periphery; Pump drainage downstream water, the integral reinforcing cofferdam.
Claims (8)
1, a kind of gravity steel frame water-tight film braced cofferdam, form by sheet triangle steelframe, dash steel form and antiseepage film, it is characterized in that, sheet triangle steelframe is the monolithic triangle steelframe that scaffolding steel pipe and right-angle coupler, revolution fastener connect into, the horizontal steel pipe of fixed connection between the monolithic triangle steelframe that is arranged in parallel constitutes three-dimensional steelframe; On three-dimensional steelframe upstream batter face, completely spread steel form and fixing, the antiseepage film that paves on the steel form face, antiseepage film is extended shop to upper water bottom surface, three-dimensional steelframe the place ahead.
2, gravity steel frame water-tight film braced cofferdam as claimed in claim 1 is characterized in that, three-dimensional steelframe upstream batter face and ground angle≤26 °.
3, gravity steel frame water-tight film braced cofferdam as claimed in claim 1 is characterized in that, it is depth of water 2-3 times that antiseepage film is extended shop to upper water bottom surface, three-dimensional steelframe the place ahead length.
4, gravity steel frame water-tight film braced cofferdam as claimed in claim 1 is characterized in that, the antiseepage film back side is spread colour bar cloth one.
5, gravity steel frame water-tight film braced cofferdam as claimed in claim 1 is characterized in that, antiseepage film is the material of material flexibility, proportion 〉=1;
6, gravity steel frame water-tight film braced cofferdam as claimed in claim 1 is characterized in that, steelframe can be used spherical threaded fastening means formula space net rack;
7, gravity steel frame water-tight film braced cofferdam as claimed in claim 1 is characterized in that, steel form can be steel plate or rigidity backing plate.
8, a kind of job practices of gravity steel frame water-tight film braced cofferdam, its working procedure is:
At installation on ground sheet triangle steelframe;
Assemble three-dimensional steelframe on the water;
Establish steel form and fixing on three-dimensional steelframe upper berth;
Antiseepage film paves on steel form;
Pump drainage downstream water, the integral reinforcing cofferdam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105646 CN1107770C (en) | 2000-04-14 | 2000-04-14 | Gravity steel frame water-tight film braced cofferdam and its construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00105646 CN1107770C (en) | 2000-04-14 | 2000-04-14 | Gravity steel frame water-tight film braced cofferdam and its construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1272572A CN1272572A (en) | 2000-11-08 |
| CN1107770C true CN1107770C (en) | 2003-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 00105646 Expired - Fee Related CN1107770C (en) | 2000-04-14 | 2000-04-14 | Gravity steel frame water-tight film braced cofferdam and its construction method |
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| CN (1) | CN1107770C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100465389C (en) * | 2007-03-23 | 2009-03-04 | 中铁大桥局集团第二工程有限公司 | Bridge heavy steel cofferdam gasbag watering method |
| CN106948352A (en) * | 2016-01-06 | 2017-07-14 | 北京翔鲲水务建设有限公司 | Front leg strut shaped steel antiseepage film cofferdam and its construction method |
| CN108442324A (en) * | 2018-05-22 | 2018-08-24 | 北京翔鲲水务建设有限公司 | Works water outlet temporary blocking device and method for blocking |
| CN111851427A (en) * | 2020-07-22 | 2020-10-30 | 桂林生 | Novel intercepting and cofferdam body of hydropower station and dam body construction method |
| CN114892691B (en) * | 2022-05-25 | 2023-10-24 | 长江勘测规划设计研究有限责任公司 | Seepage-proofing and water-stopping structure between bottom of steel box cofferdam equipment and lining plate |
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2000
- 2000-04-14 CN CN 00105646 patent/CN1107770C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1272572A (en) | 2000-11-08 |
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