Seepage interception wall for construction of water pumping station

Abstract

The utility model provides a water pumping station construction cut-off wall which comprises two rows of steel plates which are arranged oppositely and a plurality of piles which are arranged between the two rows of steel plates at equal intervals in the arrangement direction of the steel plates, the piles and the steel plates are inserted into a river bottom soil layer, the insertion depth of the piles is larger than that of the steel plates, the two rows of steel plates are tightly attached to the piles, and the two rows of steel plates are tightly attached to the piles. The two rows of steel plates are connected and fixed through connecting rods, and filling soil or fine sand is filled and tamped in an enclosed space formed between the two rows of steel plates. According to the utility model, the piles are arranged between the two rows of steel plates and limit and support the two steel plates, so that a plurality of support rod structures between the two steel plates are omitted, the deformation of the steel plates is prevented, the strength of the steel plates is improved, the stability of the seepage interception wall is ensured, and the disassembly and assembly of the seepage interception wall are facilitated.

Description

Technical Field

[0001] The utility model belongs to the field of pump station construction, and particularly relates to a cut-off wall for pump station construction. Background Art

[0002] To ensure the dry operation construction environment of the pump station on the river course, before the foundation pit excavation, the construction of the cut-off wall should be carried out around the foundation pit first. By intercepting the water flow through the cut-off wall, the pump station construction area enclosed by the cut-off wall can be in a dry operation environment. Currently, the common structures of the cut-off wall include cement-soil cut-off wall, concrete cut-off wall, and steel plate cut-off wall.

[0003] The cement-soil cut-off wall uses a multi-head small-diameter deep mixing machine to spray cement slurry into the soil and stir to form cement soil. Then, with cement as the curing agent, physical and chemical reactions occur between the curing agent and the soil, making the soil solidify into a cement-soil cut-off wall with good integrity, stability, impermeability, and certain strength to achieve the purpose of intercepting seepage.

[0004] For the concrete cut-off wall, the grooving (hole making) construction should be carried out on the ground first. With slurry supporting the wall in the foundation, a grooved hole or interlocking pile column hole is dug, and then the anti-seepage material is backfilled to build an underground continuous wall with anti-seepage performance.

[0005] For the steel plate cut-off wall, two steel plates are arranged side by side first, and then materials such as slats, cotton wadding, or hemp floss are stuffed into the space between the two steel plates to achieve the anti-seepage effect.

[0006] It can be seen that both the cement-soil cut-off wall and the concrete cut-off wall are non-recyclable and have relatively high costs. The steel plate cut-off wall has the advantages of good anti-seepage effect and recyclability. However, in the steel plate cut-off wall structure, since both steel plates are inserted into the riverbed and the steel plate itself is a thin plate member, to improve the support strength between the two rows of steel plates, several support rods and connecting rods should be arranged between the two rows of steel plates to prevent the steel plates from deforming, improve the strength of the steel plates, and ensure the stability of the cut-off wall. This structure makes the disassembly and assembly of the steel plate cut-off wall inconvenient. Content of the Utility Model

[0007] In view of this, the utility model aims to provide a cut-off wall for pump station construction, adopting a steel plate anti-seepage wall structure, so that the steel plate has relatively high support strength and is convenient for disassembly and assembly.

[0008] To achieve the above object, the technical solution of the utility model is realized as follows:

[0009] A cut-off wall for the construction of a pump station includes two rows of steel plates arranged opposite to each other, and several pile columns arranged at equal intervals between the two rows of steel plates along the arrangement direction of the steel plates. The pile columns and the steel plates are both inserted into the river bottom soil layer, and the insertion depth of the pile columns is greater than that of the steel plates. The two rows of steel plates are both closely arranged against the pile columns, and the two rows of steel plates are connected and fixed by connecting rods. The enclosed space formed between the two rows of steel plates is filled and tamped with fill soil or fine sand.

[0010] Further, steel beams are symmetrically arranged on the opposite sides of the two rows of steel plates. The steel beams are arranged along the arrangement direction of the steel plates, and the connecting rods penetrate through the steel beams.

[0011] Further, the steel beams are channel steel or square steel.

[0012] Further, a geomembrane is arranged in the enclosed space. The geomembrane is attached to the opposite sides of the two rows of steel plates, the sides of the pile columns, and the surface of the river bottom soil layer.

[0013] Further, an anti-filter layer is laid on the surface of the river bottom soil layer corresponding to the enclosed space, and the geomembrane is attached to the anti-filter layer.

[0014] Further, the depth of the pile columns inserted into the river bottom soil layer is 1 - 1.5 m greater than the insertion depth of the steel plates. The height of the two rows of steel plates above the river bottom soil layer and the insertion depth into the river bottom soil layer are in a ratio of 1:0.8 to 1:1.5.

[0015] Further, the pile columns are steel pipe piles.

[0016] Compared with the prior art, the cut-off wall for the construction of a pump station of the present utility model has the following advantages:

[0017] (1) In the present utility model, pile columns are arranged between the two rows of steel plates. The pile columns limit and support the two steel plates, eliminating the need to arrange multiple support rod structures between the two steel plates, preventing the deformation of the steel plates, improving the strength of the steel plates, ensuring the stability of the cut-off wall, and facilitating the disassembly and assembly of the cut-off wall.

[0018] (2) In the present utility model, the two rows of steel plates are inserted into the river bottom soil layer, and the enclosed space between the two rows of steel plates is filled with fill soil or fine sand. The pile columns adopt a steel pipe pile structure, and both the steel plates and the pile columns can be recycled, saving construction costs.

[0019] (3) In the present utility model, the anti-filter layer and the geomembrane are arranged to improve the anti-seepage effect of the cut-off wall and ensure dry operation construction in the construction area of the pump station enclosed by the cut-off wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0021] Figure 1 Schematic diagram of a cut-off wall structure for a pump station construction in this embodiment;

[0022] Figure 2 Schematic diagram of the positional relationship between the pile columns and steel plates of a cut-off wall for a pump station construction in this embodiment.

[0023] Explanation of reference numerals:

[0024] 1 - River bottom soil layer; 2 - Filter material layer; 3 - Geomembrane; 4 - Steel plate; 5 - Steel beam; 6 - Filled soil; 7 - Connecting rod; 8 - Pile column; 9 - Foundation pit. Specific implementation manners

[0025] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0026] The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0027] A cut-off wall for a pump station construction, Figure 1 , 2 As shown, it includes two rows of oppositely arranged steel plates 4. The distance between the two steel plates 4 is 50 - 80 mm. Both of the two steel plates 4 are inserted into the river bottom soil layer 1, and the ratio of the height of the steel plate above the river bottom soil layer 1 to the depth inserted into the river bottom soil layer 1 is 1:0.8 to 1:1.5. A surrounding space is formed between the two rows of steel plates 4. In this surrounding space, several pile columns 8 are provided. The several pile columns 8 are arranged at equal intervals along the arrangement direction of the steel plates 4. Both of the two rows of steel plates 4 are closely arranged against the pile columns 8, and the steel plates are supported by the pile columns 8. The pile columns 8 are preferably steel pipe piles, and the depth of the pile columns 8 inserted into the river bottom soil layer 1 is 1 - 1.5 m greater than the depth of the steel plates 4 inserted into the river bottom soil layer 1. The two rows of steel plates 4 are connected and fixed by several uniformly arranged connecting rods 7. The surrounding space formed by the two rows of steel plates 4 is filled and tamped with filled soil 6.

[0028] On the opposite sides of the two rows of steel plates 4, steel beams 5 are symmetrically provided. The steel beams 5 are channel steel or square steel. The steel beams 5 are arranged along the arrangement direction of the steel plates, that is, the steel beams 5 are horizontally arranged. The connecting rods 7 penetrate through the steel beams 5 and the steel plates 4, and both ends of the connecting rods 7 are fixed. The connecting rods can be made of steel bar structures, with threads provided at both ends and matching nuts. The nuts are screwed in so that the connecting rods 7 lock and fix the steel plates 4 and the steel beams 5, increasing the strength of the cut-off wall.

[0029] In the cut-off wall structure of the present utility model, a geomembrane 3 is provided in the enclosed space formed by two rows of steel plates. The geomembrane 3 is attached to the side faces opposite to the two rows of steel plates 4, the side faces of the pile columns 8, and the surface of the river bottom soil layer 1. During construction, the geomembrane 3 is ensured to have a certain reserve in the horizontal and vertical directions. After the enclosed space is filled with fill soil 6 and tamped, the fill soil 6 can fill the entire enclosed space, and this structure can further improve the cut-off effect of the cut-off wall.

[0030] For further optimization, an anti-filter layer 2 is laid on the surface of the river bottom soil layer 1 corresponding to the enclosed space, and the geomembrane 3 is attached to the anti-filter layer 2. That is, an anti-filter layer 2 is arranged between the geomembrane 3 and the river bottom soil layer 1 in the enclosed space to prevent piping and soil flow, so as to ensure the stability of the river bottom soil layer 1 corresponding to the enclosed space, and further ensure the stability of the steel plate insertion.

[0031] The operation process of the present utility model is as follows: First, construct the pile columns 8 according to the design points, then insert two rows of steel plates 4. Both rows of steel plates 4 can be attached to the pile columns 8. Install steel beams 5 on the side faces of the two rows of steel plates facing away from each other, and use connecting rods 7 to connect and fix the two rows of steel plates 4 and the steel beams 5. At this time, an enclosed space is formed between the two rows of steel plates 4. Lay an anti-filter layer 2 on the river bottom soil layer 1 corresponding to the enclosed space, set a geomembrane 3 in the enclosed space, fix the top of the geomembrane 3 at the top positions of the steel plates 4 and the pile columns 8, and leave a certain margin at the bottom of the geomembrane 3 to ensure that it can be attached to the anti-filter layer 2. Finally, fill and tamp the fill soil 6 to complete the construction of the cut-off wall. After the construction is completed, pump water from the area enclosed by the cut-off wall, then excavate the foundation pit 9 to carry out the construction of the pump station. After the construction of the pump station is completed, remove the fill soil, remove the connecting rods 7 and the steel beams 5, and remove the steel plates 4 and the pile columns 8.

[0032] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A water pump station construction cut-off wall, characterized by: The invention comprises two rows of steel plates (4) arranged opposite to each other, and a plurality of piles (8) arranged between the two rows of steel plates (4) and at equal intervals along the arrangement direction of the steel plates. The piles (8) and the steel plates (4) are both inserted into the riverbed soil layer (1), and the insertion depth of the piles (8) is greater than the insertion depth of the steel plates (4). The two rows of steel plates (4) are arranged closely to the piles (8), and the two rows of steel plates (4) are connected and fixed by connecting rods (7). The enclosed space formed between the two rows of steel plates (4) is filled with compacted backfill (6) or fine sand.

2. A water pump station construction cut-off wall according to claim 1, characterized in that: Steel beams (5) are symmetrically arranged on the opposite sides of the two rows of steel plates (4); the steel beams (5) are arranged along the arrangement direction of the steel plates; and the connecting rods (7) penetrate the steel beams (5).

3. A water pump station construction cut-off wall according to claim 2, characterized in that: The steel beam (5) is a channel steel or a square steel.

4. A water pump station construction cut-off wall according to claim 1, characterized in that: A geomembrane (3) is provided in the enclosed space, and the geomembrane (3) is attached to the opposite sides of the two rows of steel plates (4), the sides of the piles (8) and the surface of the riverbed soil layer (1).

5. A water pump station construction cut-off wall according to claim 4, characterized in that: A filter material layer (2) is laid on the surface of the riverbed soil layer (1) corresponding to the enclosed space, and the geomembrane (3) and the filter material layer (2) are bonded together.

6. A water pump station construction cut-off wall according to claim 1, characterized in that: The depth of the pile column (8) inserted into the riverbed soil layer (1) is 1-1.5 m greater than the insertion depth of the steel plate (4), and the ratio of the height of the two rows of steel plates above the riverbed soil layer (1) to the depth of the two rows of steel plates inserted into the riverbed soil layer (1) is 1:0.8 to 1:1.

5.

7. A water pump station construction cut-off wall according to claim 1, characterized in that: The pile column (8) is a steel pipe pile.

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