Composite waterproof curtain structure of deep foundation pit

Abstract

The utility model discloses a deep foundation pit combined type waterproof curtain structure which comprises a high-pressure jet grouting pile, a high-pressure grouting layer and an anti-falling steel pipe. The high-pressure jet grouting pile is arranged on the outer layer of the foundation pit, a high-pressure grouting layer is arranged at the pile bottom of the high-pressure jet grouting pile, a reinforced concrete protection wall is arranged on the inner layer of the foundation pit, a plurality of anti-falling steel pipes are arranged in the protection wall, the anti-falling steel pipes are annularly arranged at intervals along the central axis of the protection wall, and the anti-falling steel pipes are filled with grouted cores. And the anti-falling steel pipe is deeper than the protection wall. The device can be applied to water stop and seepage prevention of the deep foundation pit, and is good in pile forming effect and high in stability.

Description

Technical Field

[0001] The utility model relates to the technical field of water-stop curtains, and more specifically, to a composite water-stop curtain structure for a deep foundation pit. Background Art

[0002] The water intake pump house is usually located on the river bank. Since the water intake head elevation needs to be below the river water level for a long time, the water intake pump house elevation is relatively low. The water intake pump house has a large diameter, a deep foundation pit, and is generally located at a high groundwater level. Therefore, the water stop curtain of the water intake pump house is particularly important. In the prior art, the water stop curtain is prone to tilt due to geological reasons, resulting in uneven force on the pile foundation and poor stability of the water stop curtain, resulting in the phenomenon of "water curtain cave" in most water intake pump houses, and the required water stop effect cannot be achieved. Utility Model Content

[0003] The utility model aims to provide a composite water-stop curtain structure for a deep foundation pit, which can be applied to the water-stopping and anti-seepage of a deep foundation pit, has good pile-forming effect and high stability.

[0004] The technical solution adopted by the utility model to solve the technical problem is: a composite water-stop curtain structure for a deep foundation pit, including high-pressure jet grouting piles, a high-pressure grouting layer and an anti-falling steel pipe;

[0005] High-pressure rotary jet piles are arranged in the outer layer of the foundation pit, a high-pressure grouting layer is arranged at the bottom of the high-pressure rotary jet piles, and a reinforced concrete protective wall is arranged in the inner layer of the foundation pit. A reinforced concrete locking ring is arranged at the top of the reinforced concrete protective wall, and a plurality of anti-falling steel pipes are arranged in the protective wall. The plurality of anti-falling steel pipes are arranged at intervals in annular direction along the central axis of the protective wall. The anti-falling steel pipe is filled with a grouting core, and the depth of the anti-falling steel pipe is deeper than the depth of the protective wall.

[0006] As a further solution of the utility model, the high-pressure jet grouting piles are arranged in three layers from the outside to the inside with the same center, and the high-pressure jet grouting piles are interlocked with each other by no less than 200 mm to form a closed and continuous water-stopping curtain.

[0007] As a further solution of the utility model, the depth of the high-pressure jet grouting pile needs to enter the lower middle-weathered rock layer by at least 1m.

[0008] As a further solution of the utility model, it includes double rows of high-pressure grouting layers from the outside to the inside; the depth of the high-pressure grouting layer needs to reach at least 3m below the bottom plate of the structure to be built.

[0009] As a further solution of the utility model, the retaining wall is a reinforced concrete retaining wall.

[0010] As a further solution of the utility model, a mesh sprayed concrete layer is arranged at the bottom of the protective wall.

[0011] As a further solution of the utility model, a plurality of anchor rods are arranged at intervals on one side of the mesh sprayed concrete layer facing the high-pressure grouting layer.

[0012] The utility model includes at least the following beneficial effects: the water intake pump room is located at a high groundwater level all year round, and the water-stop curtain structure of the present application enhances the water-stopping effect, while enhancing the stability of the surrounding soil, making the pump room foundation pit more stable, and solving the problem of "water curtain cave" in most water intake pump rooms, which is of great significance for subsequent promotion.

[0013] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a top view of the composite water-stop curtain structure for deep foundation pits of the utility model;

[0015] Figure 2 It is a vertical view of the composite water-stop curtain structure of a deep foundation pit of the utility model.

[0016] Explanation of the accompanying drawings: 1 high-pressure rotary jet piles, 2 anti-falling steel pipes, 3 reinforced concrete wall protection, 4 anchor rods, 5 high-pressure grouting layer, 6 mesh sprayed concrete layer, 7 reinforced concrete locking ring. DETAILED DESCRIPTION

[0017] The utility model is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the utility model based on these descriptions. Before describing the utility model in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the utility model, including the following description, can be combined with each other without conflict.

[0018] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] The following is a further detailed description of the utility model in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows:

[0020] like Figures 1-2 As shown, the utility model provides a composite water-stop curtain structure for a deep foundation pit, which is applicable to geological areas where the upper layer is soil layer and strongly weathered rock layer, and the lower layer is moderately weathered rock layer, and includes a high-pressure jet grouting pile 1, a high-pressure grouting layer 5 and an anti-falling steel pipe 2;

[0021] A high-pressure rotary jet pile 1 is arranged on the outer layer of the foundation pit, a high-pressure grouting layer 5 is arranged at the bottom of the high-pressure rotary jet pile 1, a reinforced concrete protective wall 3 is arranged on the inner layer of the foundation pit, a reinforced concrete locking ring 7 is arranged at the top of the reinforced concrete protective wall 3, a plurality of anti-falling steel pipes 2 are arranged in the protective wall, and the plurality of anti-falling steel pipes 2 are arranged circumferentially at intervals along the central axis of the protective wall, the anti-falling steel pipe is filled with a grouting core, and the depth of the anti-falling steel pipe 2 is deeper than the depth of the protective wall.

[0022] The composite water-stop curtain structure of deep foundation pit in this application is a composite water-stop curtain, which can be used for water-stopping and anti-seepage in deep well foundation pit. During the specific construction of this embodiment, after the high-pressure rotary jet pile 1 and the high-pressure grouting layer 5 are constructed, a hole is drilled first, and the anti-falling steel pipe 2 needs to be set before the construction of the retaining wall, embedded in the medium-weathered rock layer for not less than 2m, arranged circumferentially along the central axis of the retaining wall, with a circumferential spacing of 1.5m, and C30 fine stone concrete is used to fill the steel pipe pile with the anti-falling steel pipe 2D325*12, and the gap between the anti-falling steel pipe 2 and the drill hole is filled with M15 cement mortar; then the reinforced concrete retaining wall 3 is constructed, and after the construction is completed, a reinforced concrete locking ring 7 is set at the top of the inner side of the upper soil layer and the strongly weathered rock layer foundation pit support, which is connected to the reinforced concrete retaining wall 3 as a whole.

[0023] The present technical solution may also include the following technical details to better achieve the technical effect: the high-pressure rotary jet piles 1 are arranged in three layers from the outside to the inside, and the high-pressure rotary jet piles 1 are interlocked with each other by no less than 200 mm to form a closed and continuous water-stop curtain. In this embodiment, the upper soil layer and the strongly weathered rock layer use a D700 three-row rotary jet pile water-stop curtain.

[0024] The present technical solution may also include the following technical details to better achieve the technical effect: high-pressure rotary jetting is used for the upper soil layer and the strongly weathered rock layer, and the depth of the high-pressure rotary jetting pile 1 needs to enter the lower moderately weathered rock layer by at least 1m to ensure the anti-seepage performance of the joint.

[0025] This technical solution can also include the following technical details to better achieve the technical effect: when high-pressure grouting is used to stop water in the lower medium-weathered rock layer, it includes two rows of high-pressure grouting layers 5 from the outside to the inside. In this embodiment, the spacing between the two rows of high-pressure grouting layers 5 is 1m, and the aperture is 100mm; the depth of the high-pressure grouting layer 5 must reach at least 3m below the bottom plate of the structure to be built. In this embodiment, a water intake pump house is built, so the depth of the high-pressure grouting layer 5 must reach at least 3m below the bottom plate of the water intake pump house. After the lower high-pressure grouting is completed and its strength reaches 75%, the upper high-pressure rotary spraying construction can be carried out.

[0026] This technical solution may also include the following technical details to better achieve the technical effect: the retaining wall is a reinforced concrete retaining wall 3.

[0027] The technical solution may also include the following technical details to better achieve the technical effect: a mesh sprayed concrete layer 6 is provided at the bottom of the retaining wall to further improve the waterproof and anti-seepage effect.

[0028] The technical solution may also include the following technical details to better achieve the technical effect: a plurality of anchor rods 4 are arranged at intervals on one side of the mesh sprayed concrete layer 6 facing the high-pressure grouting layer 5 to further improve the waterproof and anti-seepage effect.

[0029] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation scheme. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A composite water-stop curtain structure for a deep foundation pit, characterized in that: Including high-pressure jet grouting piles, high-pressure grouting layers and anti-falling steel pipes; High-pressure rotary jet piles are arranged in the outer layer of the foundation pit, a high-pressure grouting layer is arranged at the bottom of the high-pressure rotary jet piles, and a reinforced concrete protective wall is arranged in the inner layer of the foundation pit. A reinforced concrete locking ring is arranged at the top of the reinforced concrete protective wall. A plurality of anti-falling steel pipes are arranged in the protective wall, and the plurality of anti-falling steel pipes are arranged at intervals in annular direction along the central axis of the protective wall. The anti-falling steel pipes are filled with a grouting core, and the depth of the anti-falling steel pipes is deeper than the depth of the protective wall.

2. The deep foundation pit composite water-stop curtain structure according to claim 1, characterized in that: The high-pressure jet grouting piles are arranged in three layers from the outside to the inside with the same center, and the high-pressure jet grouting piles are interlocked with each other by no less than 200 mm to form a closed and continuous water-stopping curtain.

3. The deep foundation pit composite water-stop curtain structure according to claim 1 or 2, characterized in that: The depth of the high-pressure jet grouting piles needs to be at least 1 meter into the lower medium-weathered rock layer.

4. The deep foundation pit composite water-stop curtain structure according to claim 3, characterized in that: From the outside to the inside, it includes double rows of high-pressure grouting layers; the depth of the high-pressure grouting layer must reach at least 3m below the bottom plate of the structure to be built.

5. The deep foundation pit composite water-stop curtain structure according to claim 1, characterized in that: The retaining wall is a reinforced concrete retaining wall.

6. The deep foundation pit composite water-stop curtain structure according to claim 5, characterized in that: A mesh sprayed concrete layer is arranged at the bottom of the protective wall.

7. The deep foundation pit composite water-stop curtain structure according to claim 6, characterized in that: A plurality of anchor rods are arranged at intervals on one side of the mesh sprayed concrete layer facing the high-pressure grouting layer.

Images