Composite structure cofferdam

Abstract

The utility model discloses a cofferdam with a composite structure, which belongs to the technical field of water conservancy construction, solves the problem of difficulty in construction of a water intake pumping station, and adopts the technical scheme that the cofferdam mainly comprises an earth rock cofferdam and a steel sheet pile cofferdam, the earth rock cofferdam comprises a rock cofferdam, a stone chip layer, a soil cofferdam and a bagged soil layer which are stacked layer by layer, the stone cofferdam comprises a first upstream face and a first downstream face, the stone chip layer covers the first downstream face, the soil cofferdam covers the stone chip layer and is provided with a second upstream face and a second downstream face, the bagged soil layer covers the second upstream face, and the steel sheet pile cofferdam is arranged on one side of the second downstream face. The weir crest of the steel sheet pile cofferdam is connected with the slope toe of the second downstream face. The utility model is mainly used for providing a temporary and safe dry land construction environment for the construction of workers.

Description

Technical Field

[0001] The utility model relates to a composite structure cofferdam, belonging to the technical field of water conservancy construction. Background Art

[0002] In recent years, the number of ecological and environmental protection projects in the engineering field has gradually increased, especially the Yangtze River large environmental protection project, which conducts a series of ecological and water environment governance for the towns along the Yangtze River. The urban water environment governance is usually accompanied by the construction of pumping stations. As an important part of the water conservancy project construction, the main tasks of the pumping station are to undertake flood control and waterlogging prevention, water diversion and irrigation, and domestic water supply in the area where the pumping station is located. The operation of the pumping station will promote the rational allocation of water resources in our country and improve the utilization rate of regional water resources. The intake pumping station is generally set on the bank of rivers, lakes and seas, among which the construction of the pumping station by the river is the most difficult, mainly manifested as the large depth of the water intake, the fast water flow speed, the large water surface waves and the high shipping requirements, etc. In order to meet the requirements of the setting position and depth of the pumping station water intake, it is necessary to build a temporary construction cofferdam to ensure construction safety and provide dry construction conditions. Summary of the Invention

[0003] In order to solve the above technical problems, a composite structure cofferdam provided by the utility model solves the problem of the construction difficulty of the intake pumping station and provides a temporary and safe dry construction environment for workers.

[0004] The utility model provides a composite structure cofferdam, including an earth-rock cofferdam and a steel sheet pile cofferdam. The earth-rock cofferdam includes a stone cofferdam, a stone chip layer, a soil cofferdam and a bagged soil layer stacked layer by layer. The stone cofferdam includes a first water-facing side and a first back water side. The stone chip layer covers the first back water side. The soil cofferdam covers the stone chip layer and has a second water-facing side and a second back water side. The bagged soil layer covers the second water-facing side. The steel sheet pile cofferdam is arranged on one side of the second back water side, and the crest of the steel sheet pile cofferdam is connected with the toe of the slope of the second back water side.

[0005] Further, the slope ratio of the first water-facing side is 1:a, and a satisfies 1≤a≤1.5.

[0006] Further, the thickness X of the stone chip layer satisfies X = 0.5m.

[0007] Further, the crest width Y of the soil cofferdam satisfies Y≥4m.

[0008] Further, the slope ratio of the second water-facing side is 1:b, and b satisfies 1≤b≤2.

[0009] Further, the thickness Z of the bagged soil layer satisfies 0.2m≤Z≤0.5m.

[0010] With the above technical solution, the advantages of the present utility model are as follows: By using the stone cofferdam at the first layer to press the bottom, the underwater terrain line can be smoothed, and the bearing capacity of the entire structure can be increased. The stone chip layer at the second layer plays a role in smooth transition to facilitate the subsequent laying of other structures. The soil cofferdam at the third layer mainly prevents the water in the river from seeping into the construction site. Among them, the bagged soil layer laid on the second water-facing surface of the soil cofferdam mainly serves to prevent waves and erosion. Finally, the steel sheet pile cofferdam is used to further prevent bottom seepage around and ensure the dry construction environment at the construction site. This composite structure cofferdam has a simple structure and is convenient for construction, and can be quickly built, providing a safe and dry construction condition for workers to install the basic structure, pipelines and water pumps of the pumping station water intake. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. is a top view of a composite structure cofferdam of the present utility model;

[0012] Figure 2 FIG. is a side view of a composite structure cofferdam of the present utility model;

[0013] In the figure: earth-rock cofferdam 1, stone cofferdam 101, stone chip layer 102, soil cofferdam 103, bagged soil layer 104, first water-facing surface 1011, first back water-facing surface 1012, second water-facing surface 1031, second back water-facing surface 1032, steel sheet pile cofferdam 2, underwater terrain line 3, basic structure 4. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0015] In the description and claims of the present utility model, terms such as "first", "second", etc. (if any) are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily imply the existence of "first". It should be understood that in the present utility model, "comprising" and "having" and any of their variations are intended to cover non-exclusive inclusion. It should be understood that in the present utility model, "a plurality of" means two or more. "And / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, X and / or Y can represent three situations: X exists alone, X and Y exist simultaneously, and Y exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "Comprising X, Y, and Z", "comprising X, Y, Z" means that all of X, Y, and Z are included, "comprising X, Y, or Z" means that one of X, Y, and Z is included, and "comprising X, Y, and / or Z" means that any one or any two or all three of X, Y, and Z are included.

[0016] As Figures 1 to 2 shown, the present utility model provides a composite structure cofferdam, comprising an earth-rock cofferdam 1011 and a steel sheet pile cofferdam 2. The earth-rock cofferdam 1011 comprises a stone cofferdam 101, a stone chip layer 102, an earth cofferdam 103, and a bagged soil layer 104 stacked layer by layer. The stone cofferdam 101 comprises a first water-facing surface 1011 and a first back water-facing surface 1012. The stone chip layer 102 covers the first back water-facing surface. The earth cofferdam 103 covers the stone chip layer 102 and has a second water-facing surface 1031 and a second back water-facing surface 1032. The bagged soil layer 104 covers the second water-facing surface 1031. The steel sheet pile cofferdam 2 is arranged on one side of the second back water-facing surface 1032, and the crest of the steel sheet pile cofferdam 2 is connected to the toe of the slope of the second back water-facing surface 1032.

[0017] The present utility model uses the stone cofferdam 101 in the first layer to press the bottom, which can smooth the underwater terrain line 3 and increase the bearing capacity of the entire structure. The stone chip layer 102 in the second layer plays a role in smooth transition to facilitate the subsequent laying of other structures. The earth cofferdam 103 in the third layer mainly prevents the water in the river from seeping into the construction site. Among them, the bagged soil layer 104 laid on the second water-facing surface 1031 of the earth cofferdam 103 mainly plays the role of wave prevention and erosion prevention. The final steel sheet pile cofferdam 2 is to further prevent bottom seepage around and ensure a dry construction environment at the construction site. The composite structure cofferdam has a simple structure and is convenient for construction, and can be quickly built, providing safe and dry construction conditions for workers to install the basic structure, pipelines, and water pumps of the pumping station water intake.

[0018] Specifically, the main axis of the composite structure cofferdam is parallel to the water flow direction and is in a U-shaped structure, and both sides of the open side are connected to the river bank. Its construction steps are as follows: First, the stone cofferdam 101 is constructed preferentially. The stone cofferdam 101 is used as the first layer, that is, the base layer, and is bottom-pressed by dumping stones, which can flatten the underwater terrain line 3 and fill the rugged underwater terrain line 3 into a suitable shape to facilitate the next construction step; in the second construction step, stone chips are dumped on the first backwater surface 1012 of the stone cofferdam 101 to form a gently sloping stone chip layer 102; in the third construction step, clay is dumped above the stone chip layer 102 to form an earth cofferdam 103, and the earth cofferdam 103 serves as an impervious body to play an impervious role; in the fourth construction step, a bagged soil layer 104 is laid on the second water-facing surface 1031 of the earth cofferdam 103 to prevent the river water or the river from scouring the cofferdam, mainly playing a role in wave prevention and erosion prevention; in the last construction step, after the earth-rock cofferdam 1 is laid as a whole, a steel sheet pile cofferdam 2 is erected in the enclosed open space. The steel sheet pile cofferdam 2 is a Larsen steel sheet pile cofferdam, which is arranged on one side of the second backwater surface 1032 to further prevent bottom seepage around and ensure a dry construction environment for the foundation structure 4.

[0019] Among them, in this embodiment, the slope ratio of the first water-facing surface 1011 is 1:a, and a is 1. This slope ratio has a smaller engineering quantity, lower cost, and the smallest influence range on the river channel.

[0020] Of course, in other embodiments, a can also take values such as 1.1, 1.2, 1.3, etc. As long as 1≤a≤1.5 is satisfied, the larger a is, the safer the cofferdam is, but the larger the engineering quantity is, the higher the cost is, and the larger the influence range on the river channel is.

[0021] Specifically, the thickness X of the stone chip layer 102 satisfies X = 0.5m.

[0022] Specifically, in this embodiment, the top width Y of the earth cofferdam 103 is 5m. This value not only meets the requirements for the loading and unloading and passage of muck trucks but also meets the safety requirements of the cofferdam.

[0023] Of course, in other embodiments, Y can also take values such as 4m, 6m, 8m, etc. As long as Y≥4m is satisfied, the larger Y is, the safer the cofferdam is, but the larger the engineering quantity is.

[0024] Among them, in this embodiment, the slope ratio of the second water-facing surface 1031 is 1:b, and b is 1.5. This slope ratio has a smaller engineering quantity, lower cost, and the smallest influence range on the river channel.

[0025] Of course, in other embodiments, b can also be 1.1, 1.3, 1.7, etc. As long as b satisfies 1≤b≤2, the larger b is, the safer the cofferdam is, but the larger the engineering quantity is, the higher the cost is, and the larger the influence range on the river channel is.

[0026] Specifically, in this embodiment, the thickness of the soil layer in bags 104, Z = 0.5 m, and the soil layer in bags 104 with this thickness has the best anti-erosion effect.

[0027] In other embodiments, Z can be 0.2 m, 0.3 m, 0.4 m, etc. The larger the Z value, the better the anti-erosion effect and the safer the cofferdam.

[0028] In addition to the above preferred embodiments, the present utility model has other implementation manners. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection claimed by the present utility model.

Claims

1. A composite structure cofferdam, comprising an earth-rock cofferdam (1) and a steel sheet pile cofferdam (2), characterized in that: The earth-rock cofferdam (1) comprises a stone cofferdam (101), a stone chip layer (102), an earth cofferdam (103) and a bagged soil layer (104) stacked layer by layer; the stone cofferdam (101) comprises a first water-facing surface (1011) and a first water-receiving surface (1012); the stone chip layer (102) covers the first water-receiving surface (1012); the earth cofferdam (103) covers the stone chip layer (102) and has a second water-facing surface (1031) and a second water-receiving surface (1032); the bagged soil layer (104) covers the second water-facing surface (1031); the steel sheet pile cofferdam is arranged on one side of the second water-receiving surface (1032); and the top of the steel sheet pile cofferdam is connected to the slope foot of the second water-receiving surface (1032).

2. The composite structure cofferdam according to claim 1, characterized in that: The slope ratio of the first water-facing surface (1011) is 1:a, where a satisfies 1≤a≤1.

5.

3. The composite structure cofferdam according to claim 1, characterized in that: The thickness X of the stone chip layer (102) satisfies X=0.5m.

4. The composite structure cofferdam according to claim 1, characterized in that: The crest width Y of the earth cofferdam (103) satisfies Y≥4m.

5. The composite structure cofferdam according to claim 4, characterized in that: The slope ratio of the second water-facing surface (1031) is 1:b, where b satisfies 1≤b≤2.

6. The composite structure cofferdam according to claim 1, characterized in that: The thickness Z of the bagged soil layer (104) satisfies 0.2m≤Z≤0.5m.

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