Distribution transverse channel lining structure applied to shallow-buried water-rich fracture zone tunnel

Abstract

The utility model discloses a power distribution transverse channel lining structure applied to a shallow-buried water-rich fracture zone tunnel, the section of the power distribution transverse channel lining structure is arched, and the power distribution transverse channel lining structure comprises a first steel arch support layer positioned on the outermost side, a second steel arch support layer positioned on the inner side of the first steel arch support layer, and a third steel arch support layer positioned on the outer side of the second steel arch support layer, the composite waterproof layer is arranged on the inner side of the second steel arch support layer, and the waterproof reinforced concrete lining layer is arranged on the inner side of the composite waterproof layer. According to the utility model, the first steel arch support layer and the second steel arch support layer are adopted to form a double-layer support, so that the problem of support sinking caused by rock mass crushing and poor binding force during construction in a shallow-buried water-rich crushed zone tunnel can be solved; the composite waterproof layer formed by compounding the geotechnical cloth and the PVC waterproof plate and the innermost waterproof reinforced concrete lining layer can effectively avoid the water seepage influence caused by weak water-rich surrounding rock during secondary lining construction of the power distribution transverse channel.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a distribution cross channel lining structure applied to a shallow buried water-rich broken zone tunnel. Background Art

[0002] The distribution channel lining section is an important part of the distribution channel (also called power tunnel, cable tunnel) in the power system. This channel is usually used to accommodate and protect power facilities such as power cables, pipelines, communication lines, etc. to ensure their safe operation.

[0003] In view of the special geological conditions encountered during the construction of some tunnel sections, the construction team faced complex challenges such as significant surrounding rock settlement, severe weathering, disordered development of joints and fissures, and extremely broken rock mass with fragmented or scattered structures. The surrounding rock in these sections is loose and fragile, with extremely poor bonding strength, which brings great difficulties to the construction. Especially in the early construction stage of the distribution cross channel, these geological characteristics easily lead to the sinking and deformation of the support structure, accompanied by tunnel seepage problems.

[0004] Therefore, a new lining section of the distribution cross channel is needed to solve the sinking and deformation of the supporting structure, accompanied by the problem of tunnel seepage. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a distribution cross channel lining structure applied to shallow buried water-rich broken zone tunnels, which solves the problem of sinking and deformation of the supporting structure and the accompanying tunnel seepage problem.

[0006] To achieve the above objectives, the utility model is implemented through the following technical solutions: a distribution cross channel lining structure applied to shallow buried water-rich broken zone tunnels, the cross section of the distribution cross channel lining structure is arched, including: a first steel arch support layer located on the outermost side, a second steel arch support layer located on the inner side of the first steel arch support layer, a composite waterproof layer arranged on the inner side of the second steel arch support layer, and a waterproof reinforced concrete lining layer arranged on the inner side of the composite waterproof layer; the first steel arch support layer and the second steel arch support layer both include: a plurality of supporting steel arches equiaxially arranged in the extension direction of the tunnel, longitudinal connecting ribs connecting adjacent supporting steel arches, and sprayed concrete of the first steel arch support layer and the second steel arch support layer.

[0007] Preferably, an advance small guide tube is provided on the top of the second steel arch support layer, and grouting anchor rods are provided on the top and sides of the second steel arch support layer.

[0008] Preferably, a double-layer steel mesh is provided in the waterproof reinforced concrete lining layer.

[0009] Preferably, the supporting steel arch frame is made of an I-beam frame, the belly wall of the I-beam frame is provided with a plurality of connecting sleeves, both ends of the longitudinal connecting ribs are provided with hooks inserted into the connecting sleeves, and the adjacent I-beam frames are connected to the longitudinal connecting ribs through the connecting sleeves.

[0010] Preferably, the supporting steel arch frame includes: an A unit located in a circular shape at the top, B units arranged on both sides of the A unit and transitioning to the tunnel vertical wall, and a C unit connected to the B unit.

[0011] Preferably, the A unit and the B unit are connected by a connecting steel plate, and the B unit and the C unit are also connected by the connecting steel plate; the connecting steel plate is welded to the end faces of the I-beam frame on both sides of the connection, and circular holes are provided at the four corners of the connecting steel plate, and the circular holes on adjacent connecting steel plates are provided with bolt connections.

[0012] Preferably, the B unit is provided with a small foot-locking guide tube, and the bottom end of the C unit is provided with a foot-locking steel tube.

[0013] Preferably, the composite waterproof layer includes geotextile and PVC waterproof board.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model adopts a first steel arch support layer and a second steel arch support layer to form a double-layer support, which is beneficial to solving the problem of support sinking caused by rock crushing and poor bonding force during construction in a shallow buried water-rich broken zone tunnel. The composite waterproof layer composed of geotextile and PVC waterproof board and the innermost waterproof reinforced concrete lining layer can effectively avoid the influence of water seepage caused by soft water-rich surrounding rock during the secondary lining construction of the distribution cross channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the grouting anchor arrangement for the distribution cross channel lining structure used in shallow buried water-rich fractured zone tunnels;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the advanced small conduit arrangement of the power distribution cross channel lining structure applied to the shallow buried water-rich broken zone tunnel;

[0018] Figure 3 It is a structural diagram of the supporting steel arch;

[0019] Figure 4 It is a schematic diagram of the longitudinal connection structure of the supporting steel arch;

[0020] Figure 5 A schematic diagram of the connection structure of the connecting steel plates supporting the steel arch from the first perspective;

[0021] Figure 6 A schematic diagram of the connection structure of the connecting steel plates supporting the steel arch frame from the second perspective;

[0022] Figure 7 This is a structural diagram of the advance small guide tube on the supporting steel arch frame;

[0023] Figure 8 Schematic diagram of the structure of the grouting anchor.

[0024] In the figure: the first steel arch support layer 1, the second steel arch support layer 2, the composite waterproof layer 3, the waterproof reinforced concrete lining layer 4, the supporting steel arch 5, the longitudinal connecting ribs 6, the advance small conduit 7, the connecting sleeve 8, the I-beam frame 9, the connecting steel plate 10, the round hole 11, the bolt 12, the A unit 13, the B unit 14, the C unit 15, the locking foot small conduit 16, the locking foot steel pipe 7, the positioning steel bar 18, the grouting anchor rod 19, the cement concrete pavement 20, the drainage ditch 21, the reserved grouting section 22, the tightening hoop 23, the grouting section 24, and the grouting hole 25. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] See also Figures 1 to 8 The present embodiment provides a distribution cross channel lining structure applied to a shallow buried water-rich broken zone tunnel, the cross section of the distribution cross channel lining structure is arched, including: a first steel arch support layer 1 located on the outermost side, a second steel arch support layer 2 located on the inner side of the first steel arch support layer 1, a composite waterproof layer 3 arranged on the inner side of the second steel arch support layer 2, and a waterproof reinforced concrete lining layer 4 arranged on the inner side of the composite waterproof layer 3; the first steel arch support layer 1 and the second steel arch support layer 2 both include: a plurality of supporting steel arches 5 equiaxially arranged in the extension direction of the tunnel, longitudinal connecting ribs 6 connecting adjacent supporting steel arches 5, and sprayed concrete sprayed on the first steel arch support layer 1 and the second steel arch support layer 2. The first steel arch support layer 1 and the second steel arch support layer 2 form a double-layer support, which is conducive to solving the support sinking problem caused by rock crushing and poor bonding force during construction in a shallow buried water-rich broken zone tunnel. The composite waterproof layer 3 composed of geotextile and PVC waterproof board and the innermost waterproof reinforced concrete lining layer 4 can effectively avoid the influence of water seepage caused by soft water-rich surrounding rock during the secondary lining construction of the distribution cross channel.

[0027] An advance small conduit 7 is provided on the top of the second steel arch support layer 2, and a grouting anchor rod 19 is provided on the top and side of the second steel arch support layer 2. The advance small conduit 7 forms an advance support after grouting, which prevents the top of the tunnel from collapsing when the tunnel is excavated; the grouting anchor rod 19 further reinforces the top and both sides of the tunnel, and can form a consolidation ring behind the lining to prevent groundwater and surface water from soaking the surrounding rock and infiltrating the lining, thereby improving the waterproof effect of the lining structure.

[0028] The grouting anchor rod 19 is provided with a reserved grouting stop section 22, one end of which is provided with a tightening hoop 23, and the other end of the reserved grouting stop section is a grouting section 24, and a plurality of grouting holes 25 are provided on the grouting section.

[0029] A double-layer steel mesh is provided in the waterproof reinforced concrete lining layer 4. The double-layer steel mesh can improve the adhesion of concrete and further strengthen the supporting strength of the secondary lining.

[0030] The web of the I-beam frame 9 of the supporting steel arch frame 5 is provided with a plurality of connecting sleeves 8, and both ends of the longitudinal connecting ribs 6 are provided with hooks inserted into the connecting sleeves 8, and the adjacent I-beam frames 9 are connected to the longitudinal connecting ribs 6 through the connecting sleeves 8. The connecting sleeves 8 and the longitudinal connecting ribs 6 can realize the connection between adjacent supporting steel arch frames 5, thereby improving the stability of the overall supporting steel arch frame 5.

[0031] The supporting steel arch frame 5 includes: an A unit 13 located in a circular shape at the top, a B unit 14 provided on both sides of the A unit 13 to transition to the tunnel vertical wall, and a C unit 15 connected to the B unit 14. The A unit 13 and the B unit 14 are connected by a connecting steel plate 10, and the B unit 14 and the C unit 15 are also connected by the connecting steel plate 10; the connecting steel plate 10 is welded to the end faces of the I-beam frame 9 on both sides of the connection, and the four corners of the connecting steel plate 10 are provided with circular holes 11, and the circular holes 11 on the adjacent connecting steel plates 10 are connected with bolts 12. The supporting steel arch frame 5 is divided into an A unit 13, a B unit 14 and a C unit 15, and the supporting steel arch frame 5 can be processed outside the lining section of the distribution cross channel and then transported into the lining section of the distribution cross channel for splicing, which can improve construction efficiency.

[0032] The B unit 14 is provided with a small locking pipe 16, and the bottom end of the C unit 15 is provided with a locking steel pipe 17. The small locking pipe 16 can be used to infiltrate cement paste into the broken soil layer, thereby reasonably improving the physical and mechanical properties of the soil layer and also improving the strength of the surrounding rock; the main function of the locking pipe shed 17 is to infiltrate concrete paste into the broken soil layer through grouting technology, thereby reasonably improving the physical and mechanical properties of the soil layer and improving the strength and stability of the tunnel surrounding rock.

[0033] The composite waterproof layer 3 includes geotextile and PVC waterproof board, which mainly plays a waterproof role and is the main structure to solve the problem of water seepage.

[0034] To ensure the installation quality of the supporting steel arch frame 5, the supporting steel arch frame 5 can be assisted in installation by positioning ribs 18. The installation positions of the positioning ribs 18 are: one on each side of the A unit, one at each upper and lower ends of the B unit, and one at each upper and lower ends of the C unit. From the overall perspective, the positioning ribs 18 are symmetrical on the left and right sides of the supporting steel arch frame 5.

[0035] The ground of the distribution cross channel lining structure used in the shallow buried water-rich fractured zone tunnel is also provided with a cement concrete pavement 20, and drainage ditches are arranged on both sides of the cement concrete surface.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A distribution channel lining structure used in shallow buried water-rich broken zone tunnels, characterized in that: The cross-section of the lining structure of the power distribution cross channel is arch-shaped, and comprises: a first steel arch support layer (1) located at the outermost side, a second steel arch support layer (2) located inside the first steel arch support layer (1), a composite waterproof layer (3) arranged inside the second steel arch support layer (2), and a waterproof reinforced concrete lining layer (4) arranged inside the composite waterproof layer (3); the first steel arch support layer (1) and the second steel arch support layer (2) both comprise: a plurality of supporting steel arches (5) arranged equiaxially in the tunnel extension direction, longitudinal connecting ribs (6) connecting adjacent supporting steel arches (5), and sprayed concrete sprayed on the first steel arch support layer (1) and the second steel arch support layer (2).

2. The lining structure of a power distribution channel used in a shallow buried water-rich broken zone tunnel according to claim 1 is characterized in that: An advance small guide tube (7) is provided on the top of the second steel arch support layer (2), and grouting anchor rods (19) are provided on the top and sides of the second steel arch support layer (2).

3. The lining structure of a power distribution channel applied to a shallow buried water-rich broken zone tunnel according to claim 1 is characterized in that: A double-layer steel mesh is provided in the waterproof reinforced concrete lining layer (4).

4. The lining structure of a power distribution channel applied to a shallow buried water-rich broken zone tunnel according to claim 1 is characterized in that: The supporting steel arch frame (5) is made of an I-beam frame (9), the web of the I-beam frame (9) is provided with a plurality of connecting sleeves (8), both ends of the longitudinal connecting ribs (6) are provided with hooks inserted into the connecting sleeves (8), and adjacent I-beam frames (9) are connected to the longitudinal connecting ribs (6) via the connecting sleeves (8).

5. The lining structure of a power distribution channel used in a shallow buried water-rich broken zone tunnel according to claim 4 is characterized in that: The supporting steel arch frame (5) comprises: an A unit (13) located in a circular shape at the top, B units (14) located on both sides of the A unit (13) and transitioning to the tunnel vertical wall, and a C unit (15) connected to the B unit (14).

6. The lining structure of a power distribution channel applied to a shallow buried water-rich broken zone tunnel according to claim 5 is characterized in that: The A unit (13) and the B unit (14) are connected by a connecting steel plate (10), and the B unit (14) and the C unit (15) are also connected by the connecting steel plate (10); the connecting steel plate (10) is welded to the end faces of the I-beam frame (9) on both sides of the connection, and circular holes (11) are provided at the four corners of the connecting steel plate (10), and the circular holes (11) on adjacent connecting steel plates (10) are connected by bolts (12).

7. The lining structure of a power distribution channel applied to a shallow buried water-rich broken zone tunnel according to claim 5 is characterized in that: The B unit (14) is provided with a small foot-locking guide tube (16), and the bottom end of the C unit (15) is provided with a foot-locking steel pipe (17).

8. The lining structure of a power distribution channel applied to a shallow buried water-rich broken zone tunnel according to claim 1 is characterized in that: The composite waterproof layer (3) comprises a geotextile and a PVC waterproof board.

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