Unfavorable geological section vertical shaft construction structure

Abstract

The utility model discloses an unfavorable geological section vertical shaft construction structure which comprises a self-propelled pipe shed, a spray anchor supporting layer, a steel arch frame, a foam board and a steel reinforced concrete layer, the self-propelled pipe shed is of a hollow circular truncated cone structure and is fixedly connected with a vertical shaft wall, the spray anchor supporting layer is fixedly connected with the vertical shaft wall, and the steel arch frame is fixedly connected with the foam board. One side of each steel arch is fixedly connected with the shotcrete-anchor supporting layer, one side of the foam board is fixedly connected with the other side of each steel arch, and the steel reinforced concrete layer is fixedly connected with the other side of the foam board. The unfavorable geological section vertical shaft construction structure can effectively absorb and disperse stratum deformation stress, reduce stress of a secondary lining structure and reduce construction safety risks.

Description

Technical Field

[0001] The utility model belongs to the technical field of water conservancy and hydropower engineering construction, and particularly relates to a construction structure for a vertical shaft in a poor geological section. Background Technique

[0002] The vertical shafts of water conservancy and hydropower projects are greatly affected by poor geological factors. The excavation and support work efficiency of the shafts is slow, the progress is slow, and the safety risk is high. Therefore, it is crucial to adopt effective methods to improve the engineering safety control and accelerate the excavation and support progress. At present, the common support structure for the excavation of vertical shafts in poor altered rock geological zones is "shotcrete bolt support + secondary lining concrete". This method has a large risk of surrounding rock deformation, is prone to repeated treatment, occupies a large amount of direct construction period, and has many uncontrollable factors, resulting in low construction efficiency, long construction period, and high safety risk. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a construction structure for a vertical shaft in a poor geological section that can effectively absorb and disperse the formation deformation stress, reduce the stress on the secondary lining structure, and reduce the construction safety risk.

[0004] The technical solution of the utility model is: a construction structure for a vertical shaft in a poor geological section, including: a self-advancing pipe shed, a shotcrete bolt support layer, a steel arch frame, a foam board, and a steel reinforced concrete layer. The self-advancing pipe shed is a hollow frustum structure. The self-advancing pipe shed is drilled into the shaft wall and fixedly connected to the shaft wall. The shotcrete bolt support layer is fixedly connected to the shaft wall. The shotcrete bolt support layer includes: a plurality of anchor bolts and a shotcrete support layer. The plurality of anchor bolts are vertically inserted into the shaft wall and fixedly connected to the shaft wall through the shotcrete support layer. One side of the plurality of steel arch frames is fixedly connected to the plurality of anchor bolts. One side of the foam board is fixedly connected to the other side of the plurality of steel arch frames. The steel reinforced concrete layer is fixedly connected to the other side of the foam board. The steel reinforced concrete layer includes: a plurality of steel arch frames, a plurality of vertical connecting steel bars, and a concrete layer. The plurality of steel arch frames are fixedly connected to the other side of the foam board through the concrete layer. Vertical connecting steel bars are arranged between adjacent steel arch frames.

[0005] Further, the length of the steel pipe of the self-advancing pipe shed is 15 - 18 m, the included angle between the steel pipe and the shaft wall is 6° - 10°, and the distance between adjacent steel pipes is 40 cm.

[0006] Further, the vertical distance between adjacent steel arch frames is 50 cm, and an exhaust hole is opened every 1 m on each steel arch frame.

[0007] Advantages of the present utility model: A construction structure for a shaft in a poor geological section of the present utility model strengthens the support construction by adopting a new composite support structure system of an advanced self-advancing large pipe shed + shotcrete support + buffer pressure-relieving layer + steel reinforced concrete, which can effectively absorb and disperse the formation deformation stress, thus inhibiting the deformation of the surrounding rock and reducing the stress on the secondary lining structure; by opening an exhaust hole every 1 m on each steel arch frame, the compactness of the secondary lining concrete pouring is ensured, and the integrity of the support structure is increased; in summary, a construction structure for a shaft in a poor geological section of the present utility model can effectively absorb and disperse the formation deformation stress, reduce the stress on the secondary lining structure, and reduce the construction safety risk. Brief Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 is a schematic plan view of a construction structure for a shaft in a poor geological section of the present utility model.

[0010] Figure 2 is a schematic structural view of the self-advancing pipe shed of a construction structure for a shaft in a poor geological section of the present utility model.

[0011] Figure 3 is a schematic plan view of the self-advancing pipe shed of a construction structure for a shaft in a poor geological section of the present utility model.

[0012] Figure 4 is a schematic structural view of the steel arch frame of a construction structure for a shaft in a poor geological section of the present utility model.

[0013] In the figure: 1 - self-advancing pipe shed, 2 - steel arch frame, 3 - anchor bolt, 4 - foam board, 5 - steel reinforced concrete layer. Detailed Embodiments

[0014] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.

[0015] Such as Figures 1-4As shown in the figure, a construction structure for a shaft in a poor geological section includes: a self-advancing pipe shed 1, a shotcrete support layer, a steel arch frame 2, a foam board 4, and a steel-concrete layer 5. The self-advancing pipe shed 1 is a hollow frustum structure. The self-advancing pipe shed 1 drills into the shaft wall and is fixedly connected to the shaft wall. The shotcrete support layer is fixedly connected to the shaft wall. The shotcrete support layer includes: a number of anchor bolts 3 and a shotcrete support layer. The number of anchor bolts 3 is vertically inserted into the shaft wall and is fixedly connected to the shaft wall through the shotcrete support layer. One side of the number of steel arch frames 2 is fixedly connected to the number of anchor bolts 3. One side of the foam board 4 is fixedly connected to the other side of the number of steel arch frames 2. The steel-concrete layer 5 is fixedly connected to the other side of the foam board 4. The steel-concrete layer 5 includes: a number of steel arch frames, a number of vertical connecting steel bars, and a concrete layer. The number of steel arch frames is fixedly connected to the other side of the foam board 4 through the concrete layer. Vertical connecting steel bars are arranged between adjacent steel arch frames.

[0016] Preferably, the length of the steel pipe of the self-advancing pipe shed 1 is 15 - 18 m, the included angle between the steel pipe and the shaft wall is 6° - 10°, and the distance between adjacent steel pipes is 40 cm.

[0017] Preferably, the vertical distance between adjacent steel arch frames is 50 cm, and an exhaust hole is opened every 1 m on each steel arch frame.

[0018] During use, before shaft excavation, cover-weight concrete is poured on the heading face. A ring of self-advancing pipe shed 1 is constructed using a multi-functional MC6 hydraulic crawler drill. The length of the self-advancing pipe shed 1 is 15 - 18 m, the outer deviation angle is 6° - 10°, the opening spacing is about 40 cm, the grouting pressure of the pipe shed is 0.5 - 2.0 MPa, and pure cement slurry with a water-cement ratio of 0.5:1 is used for grouting. To avoid sudden water inrush during hole drilling, the opening diameter of the pipe shed during construction is Φ150 mm, and a hole mouth pipe of Φ146×6.5 mm, L = 3.0 m is inserted. The pipe shed parameters are: T76N (outer diameter 76 mm, wall thickness 9.5 mm) self-advancing spiral pipe shed;

[0019] Remove the cover-weight concrete on the heading face, and conduct shaft excavation, steel arch frame 2, anchor bolt 3, and shotcrete support construction according to the designed excavation support parameters;

[0020] After the construction of the steel arch frame 2 and shotcrete on the shaft wall side is completed, install the (10 cm thick polyethylene closed-cell foam board) foam board 4 in full section;

[0021] In the second lining concrete of the shaft, a closed-ring steel arch frame is added on the side close to the free face. Adjacent steel arch frames are welded and reinforced into a whole using a number of vertical connecting steel bars. The vertical distance between adjacent steel arch frames is 50 cm, and an exhaust hole (hole diameter Φ50 mm) is opened every 1 m on each steel arch frame.

[0022] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art.

Claims

1. A vertical shaft construction structure for poor geological sections, characterized in that: include: A self-propelled pipe shed (1), a sprayed anchor support layer, a steel arch frame (2), a foam board (4) and a steel concrete layer (5), wherein the self-propelled pipe shed (1) is a hollow truncated cone structure, the self-propelled pipe shed (1) is drilled into the shaft wall and fixedly connected to the shaft wall, the sprayed anchor support layer is fixedly connected to the shaft wall, the sprayed anchor support layer comprises: a plurality of anchor rods (3) and a sprayed concrete support layer, the plurality of anchor rods (3) are vertically inserted into the shaft wall and fixedly connected to the shaft wall through the sprayed concrete support layer, One side of the plurality of steel arch frames (2) is fixedly connected to the plurality of anchor rods (3), one side of the foam board (4) is fixedly connected to the other side of the plurality of steel arch frames (2), the steel concrete layer (5) is fixedly connected to the other side of the foam board (4), the steel concrete layer (5) comprises: a plurality of steel arch frames, a plurality of vertical connecting steel bars and a concrete layer, the plurality of steel arch frames are fixedly connected to the other side of the foam board (4) via the concrete layer, and vertical connecting steel bars are provided between adjacent steel arch frames.

2. A vertical shaft construction structure for poor geological sections according to claim 1, characterized in that: The length of the steel pipes of the self-propelled pipe rack (1) is 15-18 m, the angle between the steel pipes and the shaft wall is 6°-10°, and the spacing between adjacent steel pipes is 40 cm.

3. The poor geological section shaft construction structure according to claim 1 is characterized in that: The vertical spacing between adjacent steel arch frames is 50cm, and an exhaust hole is opened on each steel arch frame every 1m.

Images