An anti-floating structure with existing underground

Abstract

The present invention provides an anti-floating structure for an existing tunnel, wherein a plurality of anti-floating piles are respectively arranged on both sides of the existing tunnel; a fine stone concrete cushion is arranged on the top of the existing tunnel and the top of the anti-floating pile; an anti-floating plate is arranged on the fine stone concrete cushion, so that the anti-floating plate is fixedly connected to the top of the anti-floating pile and extends to the top of the existing tunnel, so that the buoyancy of the existing tunnel is transmitted to the anti-floating pile through the anti-floating plate and borne by the anti-floating pile. The present invention increases the anti-floating force through the force transmission system, effectively solving the problem of insufficient anti-floating force of the existing tunnel.

Description

Technical Field

[0001] The invention relates to a solution to the problem of insufficient anti-buoyancy of an existing tunnel, and is suitable for solving the problem that the anti-buoyancy of an existing tunnel does not meet the requirements of specifications. Background Art

[0002] With the development of urbanization, the land for construction is becoming increasingly scarce, and the construction of many new projects will have a certain degree of impact on existing projects. For example, it is necessary to remove a certain thickness of overburden on the existing tunnel, which will cause the existing tunnel to fail to meet the anti-floating requirements of the specification due to the reduction of the overburden load, thus becoming a safety hazard in the operation of the existing tunnel. Summary of the invention

[0003] The purpose of the present invention is to provide an anti-buoyancy structure for an existing tunnel. Through the scheme of the present invention, the anti-buoyancy can be increased through a force transmission system, thereby effectively solving the problem of insufficient anti-buoyancy of the existing tunnel.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the present invention is to provide an anti-floating structure of an existing tunnel, wherein a plurality of anti-floating piles are respectively arranged on both sides of the existing tunnel; a fine stone concrete cushion layer is arranged on the top of the exposed existing tunnel and the top of the anti-floating piles; an anti-floating plate is arranged on the fine stone concrete cushion layer, so that the anti-floating plate is fixedly connected to the top of the anti-floating pile and extends to above the top of the existing tunnel, so that the buoyancy of the existing tunnel is transmitted to the anti-floating piles through the anti-floating plate and borne by the anti-floating piles.

[0005] Preferably, the fine stone concrete cushion layer is respectively arranged at the bottom of the excavations on both sides of the existing tunnel roof, and the edge portion of the roof of the existing tunnel on the corresponding side and the top of the anti-floating piles are exposed at the bottom of each excavation.

[0006] Preferably, the bottom of the excavation is located at the top elevation of the existing tunnel roof; and the side walls on both sides of the excavation are slope sections.

[0007] Preferably, the waterproof layer of the existing tunnel is retained at the bottom of the excavation, and the fine stone concrete cushion layer is located above the waterproof layer of the existing tunnel.

[0008] Preferably, backfill soil is provided on the anti-floating plate in the excavation.

[0009] Preferably, the top surface of the backfilled soil in the excavation reaches the ground level.

[0010] Preferably, the pile heads of the anti-floating piles penetrate into the interior of the anti-floating board, so that the anti-floating piles are fixedly connected to the anti-floating board.

[0011] The present invention provides an anti-floating structure for an existing tunnel, which has the advantages that the buoyancy received by the existing tunnel is transmitted to the anti-floating plate via the top plate of the existing tunnel, and then transmitted to the anti-floating piles fixed to the anti-floating plate to bear the buoyancy. The present invention solves the problem of insufficient anti-floating force of the existing tunnel, and is suitable for solving the situation where the anti-floating force of the existing tunnel does not meet the requirements of the specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The cross section of the anti-floating structure of the existing tunnel of the present invention;

[0013] Figure 2 It is a plan view of the anti-floating structure of the existing tunnel described in the present invention. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0015] like Figure 1 , Figure 2 As shown, the present invention provides an anti-floating structure of an existing tunnel, wherein a plurality of anti-floating piles 1 are respectively arranged on both sides of the existing tunnel 6; a fine stone concrete cushion layer 3 is arranged at the uncovered portion of the top plate of the existing tunnel 6; and an anti-floating plate 2 is arranged at the top of the existing tunnel 6 and the top of the anti-floating piles 1.

[0016] The uncovered portion of the top plate of the existing tunnel 6 is at least the exposed edge portion of the top plate by excavation on both sides; at the same time, the tops of the anti-floating piles 1 on both sides of the top plate are also exposed by excavation. In a preferred example, the fine stone concrete cushion layer 3 not only serves as a protective layer for the waterproof layer of the existing tunnel 6, but also serves as a bottom formwork for the construction of the anti-floating plate 2. That is, the anti-floating plates 2 are respectively arranged on the exposed edge portions of the top plate on both sides and on the tops of the anti-floating piles 1.

[0017] When the existing tunnel 6 is subjected to buoyancy, it can be transmitted to the anti-floating plate 2 through the top plate of the existing tunnel 6; since the anti-floating pile 1 is fixed to the anti-floating plate 2 in the present invention, the buoyancy transmitted to the anti-floating plate 2 can be borne by the anti-floating pile 1. That is, the transmission path of the buoyancy is: the existing tunnel 6 (top plate) → the anti-floating plate 2 → the anti-floating pile 1.

[0018] A specific implementation of the anti-floating structure of the existing tunnel of the present invention includes the following process:

[0019] S1. On both sides of the existing tunnel 6, anti-floating piles 1 are installed downward from the ground level. The lateral spacing a, longitudinal spacing b, and number of adjacent anti-floating piles 1 can be determined according to the requirements of anti-floating force, anti-pulling coefficient of rock and soil layer, diameter of anti-floating piles 1, lateral friction resistance of rock and soil layer, and other parameters.

[0020] S2. Excavate and backfill the covering soil 4 from the ground level to the top level of the existing tunnel 6 top plate; the side walls on both sides of each excavation are slope sections 5, and the excavation slope of slope section 5 is set to 1:m (the m value can be determined based on the on-site geotechnical engineering geology). During the excavation process, attention should be paid to the protection of the waterproof membranes at the existing tunnels 6 to avoid damage to the waterproof membranes.

[0021] S3, break the pile head of the anti-floating pile 1, and then pour a fine stone concrete cushion layer 3 of a certain thickness at the bottom of the excavation (the top of the anti-floating pile 1 and the top plate of the existing tunnel 6), which can serve as a protective layer for the waterproof membrane of the existing tunnel 6 and also as a bottom formwork for the construction of the anti-floating board 2.

[0022] S4, pouring the anti-floating plate 2, and ensuring that the pile head of the anti-floating pile 1 penetrates into the anti-floating plate 2 by a certain length, the length must meet the requirements of the specification, and the thickness C of the anti-floating plate 2 is determined by the anti-floating force.

[0023] In the illustrated embodiment, the anti-floating plate 2 on each side is located at the bottom of the excavation, covers the top of the anti-floating pile 1 on the corresponding side, and extends to the edge of the top plate of the existing tunnel 6 on the corresponding side. In this example, the top plate of the existing tunnel 6 is not completely exposed, so the anti-floating plate 2 does not cover the top plate of the existing tunnel 6. In other examples, the excavation position, the fine stone concrete cushion layer 3 and the pouring range of the anti-floating plate 2 can be adjusted accordingly according to actual requirements.

[0024] S5. After the anti-floating plate 2 reaches the designed strength, backfill the covering soil 4 to the ground level.

[0025] In summary, the present invention provides an anti-floating structure for an existing tunnel, so that the buoyancy of the existing tunnel 6 is transmitted to the anti-floating plate 2 via the top plate of the existing tunnel 6, and then transmitted to the anti-floating pile 1 fixed to the anti-floating plate 2. The present invention solves the problem of insufficient anti-floating force of the existing tunnel, and is suitable for solving the problem that the anti-floating force of the existing tunnel does not meet the requirements of the specification.

[0026] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. An anti-floating structure of an existing tunnel, characterized in that: A plurality of anti-floating piles (1) are respectively arranged on both sides of the existing tunnel (6); a fine stone concrete cushion layer (3) is arranged on the top of the exposed existing tunnel (6) and the top of the anti-floating pile (1); an anti-floating plate (2) is arranged on the fine stone concrete cushion layer (3), so that the anti-floating plate (2) is fixedly connected to the top of the anti-floating pile (1) and extends at least to the top edge of the top plate of the existing tunnel (6), so that the buoyancy of the existing tunnel (6) is transmitted to the anti-floating plate (2) through the top plate of the existing tunnel (6), and then transmitted to the anti-floating pile (1) through the anti-floating plate (2), and then borne by the anti-floating pile (1); Two excavations are provided; the fine stone concrete cushion layer (3) is respectively arranged at the bottom of the excavations located on both sides of the top plate of the existing tunnel (6), and the top edge of the top plate of the existing tunnel (6) on the corresponding side and the top of the anti-floating pile (1) are exposed at the bottom of each excavation; backfilling soil (4) is arranged on the anti-floating plate (2) in the excavation; The bottom of the excavation is located at the top elevation of the roof of the existing tunnel (6); and the side walls on both sides of the excavation are both slope sections (5).

2. The anti-floating structure of an existing tunnel as claimed in claim 1, characterized in that: The bottom of the excavation retains the waterproof layer of the existing tunnel (6), and the fine stone concrete cushion layer (3) is located on the waterproof layer of the existing tunnel (6).

3. The anti-floating structure of an existing tunnel as claimed in claim 1, characterized in that: The top surface of the backfill covering soil (4) in the excavated area reaches the ground level.

4. The anti-floating structure of an existing tunnel as claimed in claim 1, characterized in that: The pile head of the anti-floating pile (1) penetrates into the interior of the anti-floating plate (2), so that the anti-floating pile (1) is fixedly connected to the anti-floating plate (2).

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