Composite temporary water retaining and seepage preventing structure

Abstract

The utility model provides a composite temporary water retaining and seepage preventing structure which comprises an earth rock cofferdam and a steel sheet pile structure. The earth rock cofferdam is provided with a top platform for construction of the steel sheet pile structure, and the steel sheet pile structure extends downwards from the top platform to the position below the bottom of the earth rock cofferdam in the vertical direction. The steel sheet pile structure comprises two layers of Larsen steel sheet pile walls which are arranged at intervals in the transverse direction of the earth-rock cofferdam, the space between the two layers of Larsen steel sheet pile walls is filled with compacted clay, the bottoms of the Larsen steel sheet pile walls extend downwards to the positions below the bottom of the earth-rock cofferdam, and the tops of the Larsen steel sheet pile walls are flush with the top platform. And a geomembrane with a good anti-seepage effect is laid on the upstream face of the earth rock cofferdam. The earth rock cofferdam and the steel sheet pile structure are combined, the water retaining and seepage preventing effects are good, construction is convenient and fast, and after construction of the to-be-built project is completed, the Larsen steel sheet piles can be detached for recycling.

Description

Technical Field

[0001] The utility model relates to the technical field of cofferdams, in particular to a composite temporary water retaining and anti-seepage structure. Background Art

[0002] When open-cut construction is used in areas such as rivers and lakes, it is often necessary to set up temporary water retaining structures, namely cofferdams, in the construction area to ensure a dry working environment and construction safety for the foundation pit construction.

[0003] The cofferdam mainly focuses on two key issues: water retention and anti-seepage. Common cofferdam forms include earth-rock cofferdam, concrete cofferdam, steel sheet pile cofferdam, steel pipe pile cofferdam, etc. Among them, earth-rock cofferdam is simple to construct and low in cost, but has poor anti-seepage effect; concrete cofferdam has good water retention and anti-seepage effects, but the quality of underwater concrete pouring is difficult to guarantee, the cost is high, and it is difficult to dismantle. It is mostly used for permanent water retaining structures; steel sheet pile cofferdam has good soil and water retaining effects, but there is a problem of construction difficulty.

[0004] In view of this, it is necessary to propose a composite temporary water retaining and anti-seepage structure to solve or at least alleviate the above defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a composite temporary water retaining and anti-seepage structure to solve the technical problems of poor water retaining and anti-seepage effect or difficulty in construction or removal of the single cofferdam structure in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides a composite temporary water retaining and anti-seepage structure, including an earth-rock cofferdam and a steel sheet pile structure, wherein the earth-rock cofferdam has a top platform for the construction of the steel sheet pile structure, and the steel sheet pile structure extends downward from the top platform in a vertical direction to below the bottom of the earth-rock cofferdam.

[0007] Preferably, the steel sheet pile structure comprises two layers of Larsen steel sheet pile walls arranged at intervals along the transverse direction of the earth-rock cofferdam; wherein, compacted clay is filled between the two layers of Larsen steel sheet walls, the bottom of the Larsen steel sheet pile wall extends downward below the bottom of the earth-rock cofferdam, and the top of the Larsen steel sheet pile wall is flush with the top platform.

[0008] Preferably, it also includes a geomembrane, and the earth-rock cofferdam also has a water-facing surface and a water-retaining surface arranged opposite to each other along the transverse direction of the top platform, and the geomembrane includes a first section covering the water-facing surface, a second section extending from the bottom of the first section to the external lake bottom for a first preset distance away from the earth-rock cofferdam, and a third section extending from the top of the first section for a second preset distance toward the water-retaining surface; wherein the first section above the normal water level is covered with artificial turf, the first section below the normal water level is covered with small earth bags, the second section is covered with small earth bags, and the top of the third section is covered with compacted clay.

[0009] Preferably, the steel sheet pile structure also includes a plurality of transverse hollow prestressed rods arranged at intervals in the vertical direction, the transverse hollow prestressed rods are installed between two layers of Larsen steel sheet pile walls, and both ends of the transverse hollow prestressed rods extend out of the corresponding Larsen steel sheet pile walls, and the transverse hollow prestressed rods have grouting holes, through which the compacted clay filled between the two layers of the Larsen steel sheet pile walls is grouting reinforced.

[0010] Preferably, the steel sheet pile structure further comprises a pile top connecting beam connected to the tops of the two layers of the Larsen steel sheet pile walls, and the pile top connecting beam is located at the top of the third section.

[0011] Preferably, the earth-rock cofferdam is obtained by dumping soil in a plurality of woven bags.

[0012] Preferably, the cross-section of the earth-rock cofferdam is in a trapezoidal shape that is small at the top and large at the bottom.

[0013] Preferably, the geomembrane is an anti-seepage composite geomembrane.

[0014] Preferably, the slopes of the water-facing surface and the water-retaining surface are both 1:1.5.

[0015] Preferably, the height of the Larsen steel sheet pile wall above the bottom surface of the earth-rock cofferdam is equal to the height of the Larsen steel sheet pile wall above the bottom surface of the earth-rock cofferdam.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model provides a composite temporary water retaining and anti-seepage structure, including an earth-rock cofferdam and a steel sheet pile structure. The earth-rock cofferdam has a top platform for the steel sheet pile structure to be constructed, and the steel sheet pile structure extends downward from the top platform in a vertical direction to below the bottom of the earth-rock cofferdam. The earth-rock cofferdam is combined with the steel sheet pile structure, wherein the earth-rock cofferdam can be built by dumping bagged earth and rock, and the bagged earth-rock cofferdam can be used as a construction platform for a double-layer Larsen steel sheet pile wall, and the overall construction is convenient; the anti-seepage system has two layers, including an anti-seepage composite geomembrane on the water-facing slope of the earth-rock cofferdam, and a double-layer Larsen steel sheet pile wall and compacted clay between the piles, which can fully guarantee the water retaining problem above the lake bottom and the anti-seepage problem above and below the lake bottom, and the water retaining and anti-seepage effect is good; after the construction of the project to be built is completed, the Larsen steel sheet piles can be removed for recycling, and the bagged earth-rock cofferdam can be quickly removed to restore the original lake landscape, which is economical and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0020] Figure 2 for Figure 1 A is an enlarged schematic diagram.

[0021] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0022] Description of Figure Numbers:

[0023] 10. Earth-rock cofferdam; 110. Top platform; 120. Water-facing surface; 130. Back-to-water surface; 140. Woven bag; 20. Steel sheet pile structure; 210. Larsen steel sheet pile wall; 220. Compacted clay; 230. Transverse hollow prestressed tie rod; 240. Pile top connecting beam; 30. Geomembrane; 310. First section; 320. Second section; 330. Third section; 340. Artificial turf; 350. Small earthbag. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] See also Figure 1 to Figure 2 A composite temporary water retaining and anti-seepage structure in one embodiment of the utility model includes an earth-rock cofferdam 10 and a steel sheet pile structure 20, wherein the earth-rock cofferdam 10 has a top platform 110 for the steel sheet pile structure 20 to be applied, and the steel sheet pile structure 20 extends downward from the top platform 110 in a vertical direction to below the bottom of the earth-rock cofferdam 10.

[0029] As a preferred embodiment, the steel sheet pile structure 20 includes two layers of Larsen steel sheet pile walls 210 arranged at intervals along the transverse direction of the earth-rock cofferdam 10; wherein, compacted clay 220 is filled between the two layers of Larsen steel sheet walls, the bottom of the Larsen steel sheet pile wall 210 extends downward below the bottom of the earth-rock cofferdam 10, and the top of the Larsen steel sheet pile wall 210 is flush with the top platform 110.

[0030] As a better implementation, please refer to Figure 1, also includes a geomembrane 30, the earth-rock cofferdam 10 also has a water-facing surface 120 and a water-receiving surface 130 which are arranged opposite to each other in the transverse direction of the top platform 110, the geomembrane 30 includes a first section 310 covering the water-facing surface 120, a second section 320 extending from the bottom of the first section 310 to the external lake bottom for a first preset distance in a direction away from the earth-rock cofferdam 10, and a third section 330 extending from the top of the first section 310 to the water-receiving surface 130 for a second preset distance; wherein, the first section 310 is partially covered with artificial turf 340 above the normal water level, the first section 310 is partially covered with small earth bags 350 below the normal water level, the second section 320 is covered with small earth bags 350, and the top of the third section 330 is covered with compacted clay 220, so as to fix and protect the geomembrane 30.

[0031] Furthermore, the steel sheet pile structure 20 also includes a plurality of transverse hollow prestressed tie rods 230 arranged at intervals in the vertical direction, the transverse hollow prestressed tie rods 230 are installed between two layers of Larsen steel sheet pile walls 210, and both ends of the transverse hollow prestressed tie rods 230 extend out of the corresponding Larsen steel sheet pile walls 210, and the transverse hollow prestressed tie rods 230 have grouting holes (not shown in the figure), through which the compacted clay 220 filled between the two layers of the Larsen steel sheet pile walls 210 is grouting reinforced, thereby improving the integrity and impermeability of the steel sheet pile structure 20.

[0032] Preferably, the steel sheet pile structure 20 further includes a pile top connecting beam 240 connected to the tops of the two layers of the Larsen steel sheet pile walls 210, and the pile top connecting beam 240 is located at the top of the third section 330. By providing the pile top connecting beam 240, the two layers of the Larsen steel sheet pile walls 210 can be connected into a whole, thereby improving the integrity of the structure.

[0033] Furthermore, the earth-rock cofferdam 10 is obtained by dumping soil in a plurality of woven bags 140. Specifically, the earth-rock cofferdam 10 uses large woven bags 140 to fill the soil (partially with small woven bags 140 to fill the soil) and dumps the soil along the longitudinal direction of the cofferdam, and stacks it in layers. The width of the top platform 110 of the earth-rock cofferdam 10 should ensure the working space requirements of the Larsen steel sheet pile wall 210. After the cofferdam is built, the area inside the cofferdam is pumped and dredged. The bagged soil material is preferably taken from the surrounding area, and it is recommended to use neutral and pollution-free clay; the woven bag 140 uses 200g / m 2 Made of anti-aging polypropylene woven fabric.

[0034] As a specific example, the cross section of the earth-rock cofferdam 10 is in a trapezoidal shape that is smaller at the top and larger at the bottom.

[0035] Furthermore, the geomembrane 30 is an anti-seepage composite geomembrane 30. Specifically, the specification of the anti-seepage composite geomembrane 30 can be selected as 300g / 0.8mmPE / 300g, and the permeability coefficient is less than 1×10 -9 cm / s. Before laying the anti-seepage composite geomembrane 30, the laying surface needs to be compacted and cleaned. The laying surface should be flat, without obvious spikes, mud, or depressions. During the laying process, the appearance of the membrane should be checked at any time for defects such as damage, pitting, and holes. If defects or damage are found, the parent material should be used to repair them in time. The overlap of the geomembrane 30 can be achieved by hot welding. Before welding, adjust the two edges of the PE single film at the joint to be flat and wrinkle-free. The overlap width is 10 cm. Heat the surfaces of the membranes to melt the surfaces, and then fuse them together through pressure. The length direction of the weld extends along the slope. A special welding machine should be used to weld anti-seepage geotextiles, and the quality of the welds should be inspected.

[0036] As a specific example, the slopes of the water-facing surface 120 and the water-receiving surface 130 are both 1:1.5. In other embodiments, those skilled in the art may also set the slopes of the water-facing surface 120 and the water-receiving surface 130 to other values.

[0037] As a specific example, the height of the Larsen steel sheet pile wall 210 above the bottom surface of the earth-rock cofferdam 10 is equal to the height above the bottom surface of the earth-rock cofferdam 10. That is, the embedding depth of the double-layer Larsen steel sheet pile wall 210 above and below the lake bottom can be controlled at 1:1, and the bottom end is preferably lower than the interface between the permeable layer and the impermeable layer.

[0038] The present application also provides a construction method of a composite temporary water retaining and anti-seepage structure for reference by technical personnel in this field: S1, dumping bagged soil to form the main body of the earth-rock cofferdam 10; S2, processing the interface between the earth-rock cofferdam 10 and the shore; S3, laying an anti-seepage composite geomembrane 30 on the water-facing surface 120; S4, back pressure and protection of the anti-seepage composite geomembrane 30; S5, constructing a double-layer Larsen steel sheet pile wall 210; S6, reinforcing the compacted clay 220 between the double-layer Larsen steel sheet pile wall 210 through the grouting holes of the transverse hollow prestressed tie rods 230; S7, constructing the pile top connecting beam 240.

[0039] This application has the following advantages:

[0040] The earth-rock cofferdam 10 is combined with the steel sheet pile structure 20, wherein the earth-rock cofferdam 10 can be built by dumping bagged earth and rock, and the bagged earth-rock cofferdam 10 can be used as a construction platform for the double-layer Larsen steel sheet pile wall 210, and the overall construction is convenient; there are two anti-seepage systems, including the anti-seepage composite geomembrane 30 on the water-facing surface 120 of the earth-rock cofferdam 10, and the double-layer Larsen steel sheet pile wall 210 and the compacted clay 220 between the piles, which can fully guarantee the water retaining problem above the lake bottom and the anti-seepage problem above and below the lake bottom, and the water retaining and anti-seepage effect is good; after the construction of the project to be built is completed, the Larsen steel sheet pile wall 210 can be dismantled for recycling, and the bagged earth-rock cofferdam 10 can be quickly dismantled to restore the original lake landscape, which is economical and fast.

[0041] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A composite temporary water retaining and anti-seepage structure, characterized in that: It includes an earth-rock cofferdam and a steel sheet pile structure, wherein the earth-rock cofferdam has a top platform for the steel sheet pile structure to be constructed, and the steel sheet pile structure extends downward from the top platform in a vertical direction to below the bottom of the earth-rock cofferdam.

2. The composite temporary water retaining and anti-seepage structure according to claim 1, characterized in that: The steel sheet pile structure includes two layers of Larsen steel sheet pile walls arranged at intervals along the transverse direction of the earth-rock cofferdam; wherein, compacted clay is filled between the two layers of Larsen steel sheet walls, the bottom of the Larsen steel sheet pile wall extends downward below the bottom of the earth-rock cofferdam, and the top of the Larsen steel sheet pile wall is flush with the top platform.

3. The composite temporary water retaining and anti-seepage structure according to claim 2 is characterized in that: It also includes a geomembrane, and the earth-rock cofferdam also has a water-facing surface and a water-retaining surface arranged opposite to each other along the transverse direction of the top platform. The geomembrane includes a first section covering the water-facing surface, a second section extending from the bottom of the first section to the external lake bottom for a first preset distance away from the earth-rock cofferdam, and a third section extending from the top of the first section for a second preset distance toward the water-retaining surface; wherein the first section is partially covered with artificial turf above the normal water level, the first section is partially covered with small earth bags below the normal water level, the second section is also covered with small earth bags, and the top of the third section is covered with compacted clay.

4. The composite temporary water retaining and anti-seepage structure according to claim 3 is characterized in that: The steel sheet pile structure also includes a plurality of transverse hollow prestressed tie rods arranged at intervals in the vertical direction. The transverse hollow prestressed tie rods are installed between two layers of Larsen steel sheet pile walls, and both ends of the transverse hollow prestressed tie rods extend out of the corresponding Larsen steel sheet pile walls. The transverse hollow prestressed tie rods have grouting holes, through which the compacted clay filled between the two layers of the Larsen steel sheet pile walls is grouting reinforced.

5. The composite temporary water retaining and anti-seepage structure according to claim 4, characterized in that: The steel sheet pile structure further includes a pile top connecting beam connected to the tops of the two layers of the Larsen steel sheet pile walls, and the pile top connecting beam is located at the top of the third section.

6. The composite temporary water retaining and anti-seepage structure according to any one of claims 1 to 5, characterized in that: The earth-rock cofferdam is obtained by dumping soil in a plurality of woven bags.

7. The composite temporary water retaining and anti-seepage structure according to claim 6, characterized in that: The cross section of the earth-rock cofferdam is in a trapezoidal shape that is small at the top and large at the bottom.

8. The composite temporary water retaining and anti-seepage structure according to claim 3, characterized in that: The geomembrane is an anti-seepage composite geomembrane.

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