Weak surrounding rock large deformation combined control tunnel and construction method

Abstract

The invention relates to a weak surrounding rock large deformation combined control tunnel and a construction method. The construction method comprises the following steps of arch foot joist arch beam type supporting system construction, outer splayed locking anchor pipe construction, inverted arch steel pipe pile grouting and collapse body pipe shed treatment construction. The method has the beneficial effects that an arch foot joist arch beam type supporting system and an inverted arch steel pipe pile grouting and temporary steel truss inverted arch combined reinforcing technology are researched and developed, the inverted arch construction efficiency is improved, and the tunnel primary lining construction quality is further improved; a temporary guide bracket for construction of a splayed locking anchor pipe is researched and developed, the bracket is arranged on core soil in a tunnel, the splayed locking anchor pipe is arranged on an arched beam, and the arched beam is fixed on a tunnel lining through an arched beam anchor rod, so that the construction effect of mounting a tunnel primary support steel frame is improved, and the overall strength and stability of an arch frame are further improved.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic tunnel construction, and in particular relates to a soft surrounding rock large deformation combined controlled tunnel and a construction method. Background Art

[0002] With the acceleration of urbanization and the rapid development of infrastructure, the demand for underground space is increasing, and the number of tunnels is also increasing. However, the geological conditions in many areas are poor and the surrounding rock is weak, which brings great challenges to tunnel construction. Especially when crossing high-stress areas or encountering weak surrounding rock, tunnel construction often leads to geological disasters such as large deformation of the surrounding rock, which poses a serious threat to the safety and stability of the tunnel.

[0003] In order to solve the deformation control problem of soft rock tunnels and ensure the safety and quality of tunnel construction, relevant researchers and construction personnel have developed a series of combined control technologies and construction methods for large deformation of soft rock. For example, lining technology and reinforcement measures are used to effectively control the deformation of soft rock tunnels and improve the stability and safety of tunnels. However, at present, such methods still have some shortcomings.

[0004] Based on the actual requirements of complex construction conditions, high construction quality and tight construction period of engineering projects, it is urgent to innovate a soft surrounding rock large deformation combined control tunnel and construction method with high construction efficiency, excellent construction quality and low safety risk, which can be used to improve the safety and efficiency of tunnel construction, ensure the stability and safety of the tunnel, and provide strong guarantee for the sustainable development of tunnel engineering. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a soft surrounding rock large deformation combined controlled tunnel and a construction method.

[0006] The construction method of the soft surrounding rock large deformation combined controlled tunnel includes the following steps: Step 1: Construction of arch foot support beam arch beam support system: After excavation, install the arch beams in sequence, and then install the arch frame on the arch frame connecting plate; Step 2: Construction of the external eight-shaped locking foot anchor pipe: Install the temporary guide bracket for the eight-shaped locking foot anchor pipe construction on the core soil, and rotate the rotating plate according to the design angle of the anchor pipe; Step 3: Grouting of inverted arch steel pipe piles: Install steel pipe piles at the inverted arch where the weak surrounding rock is located, and install grouting main pipes and grouting branches; Step 4: Construction of pipe shed for landslide treatment: Install a protective net on the landslide body and carry out pipe shed construction after grouting the landslide body.

[0007] Preferably, in step 2, a temporary guide bracket for the construction of an anchor pipe with a figure eight locking foot is placed on the core soil inside the tunnel, a slide rail is arranged at the bottom of the temporary guide bracket for the construction of an anchor pipe with a figure eight locking foot, fixed plates are arranged on both sides of the slide rail, a baffle is arranged on the upper part of the slide rail, the guide frame is placed on the slide rail through a column, and an inclined rod is arranged between the columns; a rotating plate is arranged on the top of the column, a height adjustment rod is arranged on the rotating plate, a guide groove plate is arranged on the top of the height adjustment rod, two angled grooves are arranged on the guide groove plate, an anchor pipe guide plate is arranged in the groove, an outer figure eight locking foot anchor pipe is arranged on the anchor pipe guide plate, the outer figure eight locking foot anchor pipe is placed on the arch beam, and the arch beam is fixed to the tunnel lining through the arch beam anchor rod.

[0008] Preferably, in step two, slide the temporary guide bracket for the construction of the figure-eight lock foot anchor pipe to the designed installation position of the figure-eight lock foot anchor pipe, put the anchor pipe guide plate into the groove on the guide groove plate, and finally install the outer figure-eight lock foot anchor pipe.

[0009] Preferably, the inverted arch steel pipe pile grouting and temporary steel truss inverted arch structure in step three include an inverted arch frame and steel pipe piles, grouting holes and grouting branches are arranged on the steel pipe piles, the grouting branches converge on the grouting main pipe, and valves are arranged on the grouting branches.

[0010] Preferably, in step three, during construction, the valve is opened to carry out grouting of the steel pipe piles according to the deformation of the surrounding rock on site.

[0011] Preferably, the arch foot support beam arch beam type support system in step one includes an external eight-shaped locking foot anchor pipe and an arch beam, an arch frame connecting plate is arranged on the arch beam, the arch frame is connected to the arch beam through the arch frame connecting plate, an arch beam end plate is arranged at one end of the arch beam, and an arch beam connecting plate is arranged at the other end, an arc-shaped support beam is arranged on the side of the arch frame where the surrounding rock deformation is small, a supporting vertical rod is arranged on the arc-shaped support beam, and a supporting diagonal rod is arranged between the supporting vertical rods.

[0012] Preferably, in step one, after excavation, the arch beams are installed in sequence and fixed with arch beam anchor rods, and then the arch frame is installed on the arch frame connecting plate. When the arch beam is installed, the arch beam end plate of the previous arch beam is attached to the arch beam connecting plate of the next arch beam and fixed with bolts.

[0013] Preferably, there is a landslide body in the tunnel. In step 4, after grouting of the landslide body, a protective net is set on the landslide body, anchor rods are set after grouting of the landslide body, arc plates are set on the top of the anchor rods, an auxiliary platform is set on the arc plates, a platform beam is set at the lower part of the auxiliary platform plate, platform columns are set below the platform beams, platform diagonal braces are set between the platform columns and the platform beams, a platform bottom plate is set below the platform columns, and angle-adjusting square timber is set below the platform bottom plate; pipe shed construction is carried out through the auxiliary platform.

[0014] A combined controlled tunnel construction system of weak surrounding rock with large deformation is used to implement any of the above-mentioned methods.

[0015] The beneficial effects of the present invention are: 1) The present invention has developed an arch foot support beam arch beam support system, and an inverted arch steel pipe pile grouting and temporary steel truss inverted arch combined reinforcement technology, which improves the construction efficiency of the inverted arch and further improves the construction quality of the tunnel primary lining.

[0016] 2) The present invention has developed a temporary guide bracket for the construction of an external eight-shaped locking foot anchor pipe. The bracket is placed on the core soil inside the tunnel, and the external eight-shaped locking foot anchor pipe is placed on the arch beam, and the arch beam is fixed to the tunnel lining through the arch beam anchor rod, which improves the construction effect of the initial installation of the tunnel support steel frame and further improves the overall strength and stability of the arch frame.

[0017] 3) The present invention adopts an auxiliary platform for the construction process of the landslide pipe-roof treatment, and sets a protective net on the landslide body in the tunnel, which ensures the construction effect of the soft surrounding rock landslide treatment and improves the safety of soft rock tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the combined control tunnel and construction method of weak surrounding rock with large deformation; Figure 2 This is a schematic diagram of the installation of a temporary guide bracket for the construction of an external eight-shaped lock foot anchor pipe; Figure 3 This is a schematic diagram of a temporary guide bracket for the construction of an outer eight-shaped locking foot anchor pipe; Figure 4 It is a schematic diagram of the arch foot support beam arch beam support system; Figure 5 This is the technical diagram of the combined reinforcement of the inverted arch steel pipe pile grouting and the temporary steel truss inverted arch; Figure 6 This is a schematic diagram of the installation of the auxiliary platform during the construction process of the landslide pipe shed treatment; Figure 7 It is a schematic diagram of the auxiliary platform for the construction process of landslide pipe shed treatment.

[0019] Explanation of reference numerals: 1. Tunnel 2. Arch frame 3. Arch beam 4. Outer eight-shaped lock foot anchor pipe 5. Arch frame connecting plate 6. Arch beam end plate 7. Support diagonal rod 8. Support vertical rod 9. Arc support beam 10. Arch beam connecting plate 11. Guide frame 12. Slide rail 13. Arch beam anchor rod 14. Anchor pipe guide plate 15. Core soil 16. Fixed plate 17. Baffle 18. Diagonal rod 19. Rotating plate 20. Height adjustment rod 21. Guide plate groove 22. Steel pipe pile 23. Inverted arch frame 24. Grouting branch pipe 25. Valve 26. Grouting main pipe 27. Auxiliary platform 28. Platform crossbeam 29. Landslide body 30. Angle adjustment square wood 31. Platform bottom plate 32. Platform diagonal brace 33. Protective net 34. Arc plate 35. Anchor rod. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0021] Embodiment 1 As an example, Figures 1 to 7 As shown in the figure, the construction system of this kind of combined control tunnel with large deformation of weak surrounding rock mainly involves temporary guide bracket for construction of external eight-shaped lock-foot anchor pipe, arch foot support beam arch beam support, auxiliary platform for construction process of landslide pipe shed treatment, grouting of inverted arch steel pipe pile and temporary steel truss inverted arch combined reinforcement technology, mainly including tunnel 1, arch frame 2, arch beam 3, external eight-shaped lock-foot anchor rod 4, guide frame 11, steel pipe pile 23, auxiliary platform 28, etc.

[0022] like Figure 3 As shown, the temporary guide bracket for the construction of the anchor pipe with an eight-shaped lock foot is placed on the core soil 15 inside the tunnel 1, a slide rail 12 is arranged at the bottom, fixed plates 16 are arranged on both sides of the slide rail 12, and a baffle 17 is arranged on the upper part. The columns of the guide frame 11 are placed on the slide rail 1, inclined rods 18 are arranged between the columns, a rotating plate 19 is arranged on the top, a height adjustment rod 20 is arranged on the rotating plate 19, a guide groove plate 21 is arranged on the top of the height adjustment rod 20, two angle grooves are arranged on the guide groove plate, an anchor pipe guide plate 14 is arranged in the groove, an outer eight-shaped lock foot anchor pipe 4 is arranged on the anchor pipe guide plate 14, the outer eight-shaped lock foot anchor pipe 4 is placed on the arch beam 3, and the arch beam 3 is fixed to the lining of the tunnel 1 through the arch beam anchor rod.

[0023] like Figure 4 As shown, the arch foot support arch beam type support mainly involves an outer eight-shaped lock foot anchor pipe 4, an arch beam 3, etc., an arch frame connecting plate 5 is arranged on the arch beam, the arch frame 2 is connected to the arch beam 3 through the arch frame connecting plate 5, an arch beam end plate 6 is arranged at one end of the arch beam, and an arch beam connecting plate 10 is arranged at the other end, an arc-shaped support beam 9 is arranged on the arch frame on the side where the surrounding rock deformation is small, a support vertical rod 8 is arranged on the arc-shaped support beam 9, and a support diagonal rod 7 is arranged between the support vertical rods.

[0024] like Figure 5 As shown, the inverted arch steel pipe pile grouting and temporary steel truss inverted arch combined reinforcement technology mainly includes an inverted arch frame 23 and a steel pipe pile 22, a grouting hole and a grouting branch pipe 24 are arranged on the steel pipe pile, the grouting branch pipe is gathered on the grouting main pipe 26, and a valve 25 is arranged on the grouting branch pipe.

[0025] like Figure 6 and Figure 7As shown, when there is a landslide body 29 in the tunnel 1, a protective net is arranged on the landslide body 29, and anchor rods 35 are arranged after grouting of the landslide body. An arc plate 34 is arranged on the top of the anchor rod, and an auxiliary platform 27 is arranged on the arc plate 34. A platform beam 28 is arranged at the lower part of the auxiliary platform plate, a platform diagonal brace 32 is arranged between the platform beam and the platform column, a platform bottom plate is arranged at the bottom of the platform, and angle adjustment square wood 30 is arranged under the platform bottom plate.

[0026] Embodiment 2 As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a construction method of a weak surrounding rock large deformation combined controlled tunnel using this construction system, comprising the following steps: Step 1: Construction of arch foot support beam arch beam support system: After excavation, install the arch beam 3 in sequence, and then install the arch frame 2 on the arch frame connecting plate 5.

[0027] Step 2: Construction of the outer eight-shaped lock foot anchor pipe: Figures 1 to 3 As shown, a temporary guide bracket for the construction of an anchor pipe with an eight-shaped locking foot is installed on the core soil 15, and a rotating plate 19 is rotated according to the design angle of the anchor pipe 4; the temporary guide bracket for the construction of an anchor pipe with an eight-shaped locking foot is placed on the core soil 15 inside the tunnel 1, a slide rail 12 is arranged at the bottom of the temporary guide bracket for the construction of an anchor pipe with an eight-shaped locking foot, fixed plates 16 are arranged on both sides of the slide rail 12, a baffle 17 is arranged on the upper part of the slide rail 12, a guide frame 11 is placed on the slide rail 12 through a column, and an inclined rod 18 is arranged between the columns; a rotating plate 19 is arranged on the top of the column, a height adjustment rod 20 is arranged on the rotating plate 19, a guide groove plate 21 is arranged on the top of the height adjustment rod 20, two angle grooves are arranged on the guide groove plate 21, an anchor pipe guide plate 14 is arranged in the groove, an outer eight-shaped locking foot anchor pipe 4 is arranged on the anchor pipe guide plate 14, the outer eight-shaped locking foot anchor pipe 4 is placed on the arch beam 3, and the arch beam 3 is fixed to the lining of the tunnel 1 through the arch beam anchor rod 13.

[0028] Slide the temporary guide bracket for the construction of the figure eight locking foot anchor pipe to the designed installation position of the figure eight locking foot anchor pipe 4, put the anchor pipe guide plate 14 into the groove on the guide groove plate 21, and finally install the outer figure eight locking foot anchor pipe 4.

[0029] Step 3: Grouting of inverted steel pipe piles: Figure 5 As shown, a group of steel pipe piles 22 are installed at the invert where the weak surrounding rock is located, and a grouting main pipe 26 and a grouting branch pipe 24 are installed.

[0030] Step 4: Treatment of landslide body 29 pipe shed: Figure 6 As shown, a protective net 33 is installed on the landslide body 29, and pipe shed construction is carried out after grouting of the landslide body 29.

[0031] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0032] Embodiment 3 As another embodiment, this embodiment 3 proposes, on the basis of the embodiment 2, a construction method of a weak surrounding rock large deformation combined controlled tunnel using a more specific construction system: In step one, if Figure 3 and Figure 4 As shown, the arch foot support beam arch beam type support system includes an outer eight-shaped locking foot anchor pipe 4 and an arch beam 3, an arch frame connecting plate 5 is arranged on the arch beam 3, the arch frame 2 is connected to the arch beam 3 through the arch frame connecting plate 5, an arch beam end plate 6 is arranged at one end of the arch beam 3, and an arch beam connecting plate 10 is arranged at the other end, an arc support beam 9 is arranged on the arch frame 2 on the side where the surrounding rock deformation is small, a support vertical rod 8 is arranged on the arc support beam 9, and a support diagonal rod 7 is arranged between the support vertical rods 8.

[0033] After excavation, the arch beams 3 are installed in sequence and fixed with arch beam anchor rods 13, and then the arch frame 2 is installed on the arch frame connecting plate 5. When the arch beam 3 is installed, the arch beam end plate of the previous arch beam is attached to the arch beam connecting plate 10 of the next arch beam and fixed with bolts.

[0034] In step three, if Figure 5 As shown, the inverted arch steel pipe pile grouting and temporary steel truss inverted arch structure includes an inverted arch frame 23 and a steel pipe pile 22. The steel pipe pile 22 is provided with a grouting hole and a grouting branch pipe 24. The grouting branch pipe 24 is gathered on the grouting main pipe 26. The grouting branch pipe 24 is provided with a valve 25.

[0035] During construction, the valve 25 is opened to perform grouting of the steel pipe pile 22 according to the deformation of the surrounding rock on site.

[0036] like Figure 6 and Figure 7 As shown, there is a landslide body 29 in the tunnel 1. In step 4, after the landslide body 29 is grouted, a protective net 33 is set on the landslide body 29, and anchor rods 35 are set after the landslide body 29 is grouted. An arc plate 34 is set on the top of the anchor rod, and an auxiliary platform 27 is set on the arc plate 34. A platform beam 28 is set at the lower part of the auxiliary platform 27, and a platform column is set below the platform beam 28. A platform diagonal brace 32 is set between the platform column and the platform beam 28, a platform bottom plate 31 is set below the platform column, and angle adjustment square timber 30 is set under the platform bottom plate 31; pipe shed construction is carried out through the auxiliary platform 27.

[0037] It should be noted that the parts in this embodiment that are the same or similar to those in the second embodiment can be referenced to each other and will not be described in detail in this application.

[0038] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a soft surrounding rock large deformation combined controlled tunnel, characterized in that The following steps are involved: Step 1: Construction of arch foot support beam arch beam support system: After excavation, install the arch beams in sequence, and then install the arch frame on the arch frame connecting plate; Step 2: Construction of the external eight-shaped locking foot anchor pipe: Install the temporary guide bracket for the eight-shaped locking foot anchor pipe construction on the core soil, and rotate the rotating plate according to the design angle of the anchor pipe; Step 3: Grouting of inverted arch steel pipe piles: Install steel pipe piles at the inverted arch where the weak surrounding rock is located, and install grouting main pipes and grouting branches; Step 4: Construction of pipe shed for landslide treatment: Install a protective net on the landslide body and carry out pipe shed construction after grouting the landslide body.

2. The construction method of a large deformation combined controlled tunnel in soft surrounding rock according to claim 1 is characterized in that: In step 2, a temporary guide bracket for the construction of an anchor pipe with a figure eight locking foot is placed on the core soil inside the tunnel, a slide rail is arranged at the bottom of the temporary guide bracket for the construction of an anchor pipe with a figure eight locking foot, fixed plates are arranged on both sides of the slide rail, a baffle is arranged on the upper part of the slide rail, the guide frame is placed on the slide rail through a column, and an inclined rod is arranged between the columns; a rotating plate is arranged on the top of the column, a height adjustment rod is arranged on the rotating plate, a guide groove plate is arranged on the top of the height adjustment rod, two angled grooves are arranged on the guide groove plate, an anchor pipe guide plate is arranged in the groove, an outer figure eight locking foot anchor pipe is arranged on the anchor pipe guide plate, the outer figure eight locking foot anchor pipe is placed on the arch beam, and the arch beam is fixed to the tunnel lining through the arch beam anchor rod.

3. The construction method of a large deformation combined controlled tunnel in soft surrounding rock according to claim 2 is characterized in that: In step two, slide the temporary guide bracket for the construction of the figure-eight lock foot anchor pipe to the designed installation position of the figure-eight lock foot anchor pipe, put the anchor pipe guide plate into the groove on the guide groove plate, and finally install the outer figure-eight lock foot anchor pipe.

4. The construction method of a large deformation combined controlled tunnel in soft surrounding rock according to claim 1 is characterized in that: The inverted arch steel pipe pile grouting and temporary steel truss inverted arch structure in step three include an inverted arch frame and steel pipe piles. Grouting holes and grouting branches are arranged on the steel pipe piles. The grouting branches are collected on the grouting main pipe, and valves are arranged on the grouting branches.

5. The construction method of a large deformation combined controlled tunnel in soft surrounding rock according to claim 4 is characterized in that: In step three, during construction, the valve is opened to carry out grouting of steel pipe piles according to the deformation of the surrounding rock on site.

6. The construction method of a large deformation combined controlled tunnel in soft surrounding rock according to claim 1 is characterized in that: The arch foot support beam arch beam type support system in step one includes an outer eight-shaped locking foot anchor pipe and an arch beam, an arch frame connecting plate is arranged on the arch beam, the arch frame is connected to the arch beam through the arch frame connecting plate, an arch beam end plate is arranged at one end of the arch beam, and an arch beam connecting plate is arranged at the other end, an arc-shaped support beam is arranged on the arch frame on the side where the surrounding rock deformation is small, a supporting vertical rod is arranged on the arc-shaped support beam, and a supporting diagonal rod is arranged between the supporting vertical rods.

7. The construction method of a large deformation combined controlled tunnel in soft surrounding rock according to claim 6 is characterized in that: In step one, after excavation, the arch beams are installed in sequence and fixed with arch beam anchor rods, and then the arch frame is installed on the arch frame connecting plate. When the arch beam is installed, the arch beam end plate of the previous arch beam is attached to the arch beam connecting plate of the next arch beam and fixed with bolts.

8. The construction method of a large deformation combined controlled tunnel with weak surrounding rock according to claim 1 is characterized in that: There is a landslide body in the tunnel. In step 4, after grouting of the landslide body, a protective net is set on the landslide body, anchor rods are set after grouting of the landslide body, arc plates are set on the tops of the anchor rods, auxiliary platforms are set on the arc plates, platform beams are set at the bottom of the auxiliary platform plates, platform columns are set below the platform beams, platform diagonal braces are set between the platform columns and the platform beams, a platform bottom plate is set below the platform columns, and angle-adjusting square timbers are set below the platform bottom plate; pipe shed construction is carried out through the auxiliary platform.

9. A combined controlled tunnel construction system for weak surrounding rock with large deformation, characterized by: Used to implement the method according to any one of claims 1 to 8.

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