A type of cofferdam for river management projects

Abstract

This utility model relates to a cofferdam for river management projects, comprising two Larssen piles driven into the bottom layers of silt, loam, and clay in sequence. Each Larssen pile has a top beam welded to its upper outer side, and the top beams are connected and fixed by steel reinforcement rods. Upstream of the Larssen piles, above the silt layer, is a ballast rock, and downstream, above the silt layer, is a ballast bag filled with soil. The entire interior section of both Larssen piles is filled with soil bags. The inner side of the Larssen piles is covered with tarpaulin along its height. A beam support plate is welded to the lower part of the top beam on the outer side of the Larssen piles. This utility model has a simple structure and, through the steel reinforcement rods, ballast rock, ballast bagged soil, and soil bags, can comprehensively ensure the overall stability of the cofferdam, improving its strength and performance.

Description

Technical Field

[0001] This utility model relates to the technical field of river management, and in particular to a cofferdam for river management projects. Background Technology

[0002] A cofferdam is a temporary retaining structure built in hydraulic engineering projects to construct permanent hydraulic facilities. Its function is to prevent water and soil from entering the construction site, facilitating drainage, excavation of the foundation pit, and construction of the structure. It is generally used in hydraulic engineering structures and, except when part of a permanent building, is usually dismantled after use. The cofferdam's height is higher than the highest water level that may occur during the construction period.

[0003] Existing cofferdam structures are generally quite complex, and their stability needs to be improved. Utility Model Content

[0004] This utility model aims to address the shortcomings of existing technologies by providing a cofferdam for river management projects.

[0005] To achieve the above objectives, this utility model adopts the following technical solution:

[0006] A cofferdam for river management projects includes two Larssen piles driven into a silt layer, a loam layer, and a clay layer at the bottom. Each of the two Larssen piles has a pile top beam welded to its upper outer side. The pile top beams of the two Larssen piles are connected and fixed by steel tie rods. Upstream of the Larssen piles, above the silt layer, there is a ballast rock, and downstream of the Larssen piles, above the silt layer, there is a ballast bag filled with soil. The entire cross-section of the interior of the two Larssen piles is filled with bagged soil.

[0007] The inner side of the Larsen pile is covered with colored stripes along the height direction.

[0008] A crossbeam support plate is welded to the lower part of the crossbeam at the top of the Larsen pile.

[0009] The Larsen pile is 15m long, the top elevation of the Larsen pile is 3.6m, and the distance between two Larsen piles is 6m.

[0010] The diameter of the steel tie rod is 40mm, and the spacing between two adjacent steel tie rods is 0.8m.

[0011] The crossbeam support plate has a triangular structure, with dimensions of 0.5×0.5m and a thickness of 14mm.

[0012] The bottom elevation of the crossbeam at the top of the pile is 2.28m.

[0013] The beneficial effects of this utility model are: the utility model has a simple structure, and through steel bar tie rods, ballast stones, ballast bags, and filling bags, it can comprehensively ensure the overall stability of the cofferdam, thereby improving the strength and performance of the cofferdam. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] In the diagram: 1-Larsen pile; 2-Pile top beam; 3-Reinforcing tie rod; 4-Balancing riprap; 5-Balancing bagged soil; 6-Filling bagged soil; 7-Beam support plate; 8-Silt layer; 9-Loam layer; 10-Clay layer;

[0016] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0017] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0018] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] like Figure 1 As shown, a cofferdam for river management projects includes two Larssen piles 1 driven into the bottom in sequence, consisting of a silt layer 8, a loam layer 9, and a clay layer 10. A pile top beam 2 is welded to the upper outer side of each of the two Larssen piles 1. A beam support plate 7 is welded to the lower part of the pile top beam 2 on the outer side of the Larssen pile 1. The pile top beams 2 of the two Larssen piles 1 are connected and fixed by steel tie rods 3.

[0022] The top beam 2 and Larsen pile 1 are connected by welding. The weld is full. Before welding, rust, oil and debris at the welding point are removed.

[0023] The connection between the steel tie rod 3 and the pile top beam 2 is strong and reliable.

[0024] Upstream of Larsen pile 1, above the silt layer 8, there is a ballast stone 4; downstream of Larsen pile 1, above the silt layer 8, there is a ballast bagged soil 5; and the entire cross-section inside both Larsen piles 1 is filled with bagged soil 6.

[0025] The requirements for the ballast stones in ballast 4 are as follows: natural density > 2400 kg / m³, easily calcifiable stones and weathered stones are not allowed, mud content of the stones should not exceed 1%, maximum water absorption rate ≤ 10%, saturated compressive strength > 30 MPa, and softening coefficient > 0.75. The particle size and weight of the stones to be ballasted must meet the requirements of the design drawings. Stones with a particle size of 0.15-0.5 μm should be used for ballasting, with a single stone weighing 20-70 kg. Before ballasting, stones should be ballasted sequentially from upstream to downstream, with larger stones covering smaller stones.

[0026] 5. Before filling and dumping bagged soil, tree roots, stones and other debris should be removed from the riverbed at the bottom of the weir.

[0027] 5. For the ballast bagged soil and 6. for the filling bagged soil, polypropylene ecological bags should be used. The soil inside the bags should be loose, cohesive soil and should not contain stones, garbage, wood or other debris.

[0028] The inner side of Larssen pile 1 is covered with colored tarpaulin along its height. The tarpaulin is made of double-layered polyethylene tarpaulin for engineering use, and the geotextile is 120g / m². 2 The tensile strength indicators are: warp strength ≥2100N / 5cm, weft strength ≥1600N / 5cm; it is waterproof, with a water pressure resistance value ≥2000mm water column, can withstand low temperatures, with a cold resistance temperature of -20℃, and is mildew-proof, with a mildew resistance test grade of level 1.

[0029] Larsen pile 1 is 15m long, the top elevation of Larsen pile 1 is 3.6m, and the distance between two Larsen piles 1 is 6m.

[0030] The diameter of the steel tie rod 3 is 40mm, and the spacing between two adjacent steel tie rods 3 is 0.8m.

[0031] The crossbeam support plate 7 has a triangular structure, with dimensions of 0.5×0.5m and a thickness of 14mm.

[0032] The bottom elevation of the pile top beam 2 is 2.28m.

[0033] This utility model has a simple structure. Through the steel reinforcement rod 3, the ballast stone 4, the ballast bag soil 5, and the filling bag soil 6, it can ensure the overall stability of the cofferdam in all aspects, and improve the strength and performance of the cofferdam.

[0034] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A cofferdam for river management projects, characterized in that, The structure includes two Larsen piles (1) with a bottom layer of silt (8), a layer of loam (9) and a layer of clay (10) driven in sequence. The upper outer side of each Larsen pile (1) is welded with a pile top beam (2). The pile top beams (2) of the two Larsen piles (1) are connected and fixed by steel tie rods (3). Upstream of the Larsen pile (1) above the silt layer (8) there is a ballast stone (4). Downstream of the Larsen pile (1) above the silt layer (8) there is a ballast bag soil (5). The entire cross section of the two Larsen piles (1) is filled with bag soil (6).

2. A cofferdam for river management projects according to claim 1, characterized in that, The inner side of the Larsen pile (1) is covered with colored stripes along the height direction.

3. A cofferdam for river management projects according to claim 2, characterized in that, A crossbeam support plate (7) is welded to the lower part of the crossbeam (2) at the top of the Larsen pile (1).

4. A cofferdam for river management projects according to claim 3, characterized in that, The length of Larsen pile (1) is 15m, the top elevation of Larsen pile (1) is 3.6m, and the distance between two Larsen piles (1) is 6m.

5. A cofferdam for river management engineering according to claim 4, characterized in that, The diameter of the steel tie rod (3) is 40mm, and the spacing between two adjacent steel tie rods (3) is 0.8m.

6. A cofferdam for river management engineering according to claim 5, characterized in that, The crossbeam support plate (7) has a triangular structure with dimensions of 0.5×0.5m and a thickness of 14mm.

7. A cofferdam for river management engineering according to claim 6, characterized in that, The bottom elevation of the pile top beam (2) is 2.28m.

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