Supporting structure used for gravel clay stratum shallow-buried tunnel underneath passing high-voltage line tower

Abstract

The utility model discloses a supporting structure for a gravel clay stratum shallow-buried tunnel underneath pass high-voltage line tower, which comprises an existing high-voltage line tower, an excavated shallow-buried underneath pass tunnel body and a reinforcing pile arranged on the side edge of a tower base of the high-voltage line tower, and the reinforcing pile penetrates into the gravel clay stratum. A plurality of anchor rods are arranged between the lining of the shallow-buried under-penetrating tunnel body and the reinforcing piles; the anchor rods comprise grouting anchor rods penetrating into the gravel clay stratum and pre-stressed anchor rods penetrating through the reinforcing piles, and waist beams are arranged among the multiple pre-stressed anchor rods. Good cohesiveness and frictional property of the gravel soil layer are utilized, the side wall of the tunnel is connected with the stable stratum through the anchor rod support, settlement accidents are avoided, and therefore the foundation of the high-voltage line tower is well protected.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of road and bridge construction, and particularly relates to a supporting structure for shallow-buried tunnel underpassing a high-voltage line tower in sandy clay stratum. BACKGROUND

[0002] Sandy clay stratum is a sedimentary layer formed by mixing sand and clay. The composition ratio, particle size and distribution of the sandy clay stratum vary with different locations and are usually affected by multiple factors such as sedimentary environment, water flow speed and sedimentation time.

[0003] Due to the high content of clay, the permeability of the sandy clay stratum is relatively weak, and the gap between clay particles is small, so that water is difficult to penetrate quickly. In the construction of a shallow-buried tunnel in the sandy clay stratum, appropriate construction techniques need to be used to ensure the stability and safety of the tunnel.

[0004] Among them, the safety and stability of the high-voltage line tower is one of the key problems in the tunnel underpassing project. In order to protect the high-voltage line, it is necessary to prevent the occurrence of ground subsidence or inclination, and also to avoid construction safety accidents caused by construction near the high-voltage line. Therefore, in order to overcome the problem of insufficient stability in the sandy clay stratum, higher requirements are put forward for the supporting structure of the high-voltage line tower. SUMMARY

[0005] The utility model aims at providing a supporting structure for shallow-buried tunnel underpassing a high-voltage line tower in sandy clay stratum, which utilizes the good adhesion and friction of sandy soil layer, uses anchor rod support to connect the tunnel side wall and stable stratum, avoids settlement accidents, and thus protects the foundation of the high-voltage line tower well.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme as follows:

[0007] The supporting structure for shallow-buried tunnel underpassing a high-voltage line tower in sandy clay stratum comprises an existing high-voltage line tower and a shallow-buried underpassing tunnel body, further comprises a reinforcing pile arranged at the side of the tower foundation of the high-voltage line tower, and the reinforcing pile penetrates into the sandy clay stratum; a plurality of anchor rods are arranged between the lining of the shallow-buried underpassing tunnel body and the reinforcing pile; the anchor rod comprises a transverse drainage pipe penetrating into the sandy clay stratum and a prestressed anchor rod penetrating through the reinforcing pile, and a waist beam is arranged between the plurality of prestressed anchor rods.

[0008] Further, the waist beam is a plurality of, and the plurality of waist beams are arranged at different heights respectively.

[0009] Further, the plurality of waist beams are provided with transverse drainage pipes.

[0010] Further, the tail ends of the grouting anchor rod and the prestressed anchor rod are arranged in the lining of the shallow-buried underpass tunnel body.

[0011] Further, the upper end of the reinforcement pile is provided with a crown beam.

[0012] Further, the prestressed anchor rod and the grouting anchor rod are connected with a steel mesh.

[0013] Compared with the prior art, the utility model has the advantages that: the utility model simple structure, operation constitutes, through to the range of adjacent high-voltage line tower adds reinforcement pile, and connects multiple anchor rods between underpass tunnel and reinforcement pile, thereby can effectively protect and reinforce the foundation of high-voltage line tower, reduces the adverse effect of underpass construction process to high-voltage line tower. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced to the drawing needed to be used in the embodiment, should understand, the following drawings only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0015] Figure 1 It is the structural schematic diagram of the supporting structure for the sand and gravel clay stratum shallow-buried tunnel underpass high-voltage line tower provided by the utility model.

[0016] Reference signs:

[0017] 1, shallow-buried underpass tunnel body;2, high-voltage line tower;3, prestressed anchor rod;4, waist beam;5, crown beam;6, reinforcement pile;7, transverse drainage pipe;8, transverse drainage pipe;9, lining. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantage of the utility model embodiment more clearly, the following will be combined with the drawing in the utility model embodiment, and the technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is a part of the embodiment of the utility model, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skilled person in the art without making creative labor are within the protection scope of the utility model.

[0019] It should be noted that: similar signs and letters indicate similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0020] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first," "second," and "third" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0022] Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0025] like Figure 1 As shown, the support structure for a shallow-buried tunnel passing under a high-voltage power line tower in gravelly clay strata includes an existing high-voltage power line tower 2, an excavated shallow-buried tunnel body 1, and reinforcing piles 6 set on the side of the tower base of the high-voltage power line tower 2, with the reinforcing piles 6 penetrating the gravelly clay strata; and multiple anchor rods are set between the lining 9 of the shallow-buried tunnel body 1 and the reinforcing piles 6; the anchor rods include grouting anchor rods penetrating the gravelly clay strata, and prestressed anchor rods 3 passing through the reinforcing piles 6, and a waist beam 4 is set between the multiple prestressed anchor rods 3.

[0026] Compared with the prior art, in the prior art, the selection and design of the supporting structure are crucial when carrying out tunnel or other underground engineering construction in a sandy gravel soil stratum. Such a stratum usually has uneven particle size, strong water permeability, relatively good bearing capacity but easy settlement, and due to the complexity and uncertainty of the sandy gravel soil stratum, the supporting structure may face a large deformation risk, and therefore the supporting structure needs to have good stability, impermeability and adaptability. Generally speaking, when a tunnel is constructed to pass underneath, advanced support and pre-reinforcement treatment need to be used, on the one hand, a small catheter is used to inject slurry into the stratum to form a reinforced zone and improve the bearing capacity and stability of the stratum, and on the other hand, a pipe shed is arranged in front of the tunnel excavation face, and the stratum around the pipe shed is reinforced by grouting to form a supporting system. The conventional primary support is mainly used for supporting and reinforcing the tunnel itself, and less consideration is given to the stability of the foundation of the high-voltage line tower 2 close to the tunnel. When the conventional anchor rod support is carried out, the anchor rod is only passed through the tunnel side wall and connected with the stratum, and the soil pressure and water pressure are resisted by the tension of the anchor rod.

[0027] In the utility model, the foundation position of the high-voltage line tower 2 adjacent to the tunnel is additionally provided with a reinforcing pile 6, and the prestressed anchor rod 3 is passed between the primary lining 9 of the tunnel and the reinforcing pile 6 for reinforcement, and the grouting anchor rod is passed between the tunnel itself and the stratum, so that the foundation of the high-voltage line tower 2 can be effectively protected, and the high-voltage line tower 2 does not need to be relocated, thereby effectively reducing the construction cost.

[0028] The waist beams 4 are multiple, and the multiple waist beams 4 are arranged at different heights. The multiple waist beams 4 are provided with a cross-drain pipe 87. By increasing the drain pipe, the water at the foundation position of the high-voltage line tower 2 can be discharged.

[0029] The tail ends of the grouting anchor rod and the prestressed anchor rod 3 are arranged in the lining 9 of the shallow-buried underpass tunnel body 1. The reinforcing pile 6 is provided with a corbel 5 at the upper end.

[0030] The prestressed anchor rod 3 and the grouting anchor rod are connected with a steel mesh.

[0031] In specific use, first, the tunnel excavation operation is carried out in the gravel clay stratum, wherein, before the tunnel excavation, the stratum is reinforced by using the advanced small guide pipe or pipe shed and other supporting measures. This can enhance the bearing capacity of the stratum, reduce the stratum settlement, and ensure the stability of the tunnel. In the excavation process, the three-step temporary inverted arch method, the CRD method and other excavation methods can be used. These methods can reduce the disturbance to the stratum, ensure the stability and safety of the tunnel. When the tunnel passes through the high-voltage line tower 2, the reinforcing pile 6 is buried in the side of the high-voltage line tower 2 in advance, and the pre-stressed anchor rod 3 is punched into the reinforcing pile 6 and effectively protects the tower foundation part of the high-voltage line tower 2 together with the reinforcing pile 6, avoiding the settlement and other problems of the tower foundation of the high-voltage line tower 2.

[0032] The above-described and above-embodied examples are only used to illustrate the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A supporting structure for shallow-buried tunnel underpassing high-voltage line tower in sandy clay stratum, comprising an existing high-voltage line tower (2) and a shallow-buried underpassing tunnel body (1) excavated, characterized in that: It also includes the reinforcing pile (6) arranged at the side of the tower base of the high-voltage line tower (2), and the reinforcing pile (6) penetrates into the sandy clay stratum; and a plurality of anchor rods are arranged between the lining (9) of the shallow-buried underpass tunnel body (1) and the reinforcing pile (6); the anchor rod includes the grouting anchor rod penetrating into the sandy clay stratum, and the prestressed anchor rod (3) penetrating through the reinforcing pile (6), and the waist beam (4) is arranged between the plurality of prestressed anchor rods (3).

2. The supporting structure for shallow-buried tunnel undercrossing high-voltage line tower in sandy clay stratum according to claim 1, characterized in that: The waist beam (4) is multiple, and the multiple waist beams (4) are arranged at different heights respectively.

3. The supporting structure for shallow-buried tunnel undercrossing high-voltage line tower in sandy clay stratum according to claim 2, characterized in that: The plurality of waist beams (4) are provided with the transverse drainage pipe (8) (7).

4. The supporting structure for shallow-buried tunnel undercrossing high-voltage line tower in sandy clay stratum according to claim 1, characterized in that: The tail ends of the grouting anchor rod and the prestressed anchor rod (3) are arranged in the lining (9) of the shallow-buried underpass tunnel body (1).

5. The supporting structure for shallow-buried tunnel undercrossing high-voltage line tower in sandy clay stratum according to claim 1, characterized in that: The upper end of the reinforcing pile (6) is provided with the corbel beam (5).

6. The supporting structure for shallow buried tunnel undercrossing high voltage line tower in sandy clay stratum according to claim 1, characterized in that: The prestressed anchor rod (3) and the grouting anchor rod are connected with the steel mesh.

Images