Tunnel with combined control of large deformation in soft surrounding rock and construction method

Abstract

The present invention relates to a tunnel with a combined control of large deformation of soft surrounding rock and a construction method, including the following steps: construction of an arch-foot supporting beam and arch beam type supporting system, construction of external-inclined angle locking foot anchor pipes, grouting of inverted arch steel pipe piles, and treatment construction of pipe roofs in collapse bodies. The beneficial effects of the present invention are as follows: an arch-foot supporting beam and arch beam type supporting system, as well as a combined reinforcement technology of grouting of inverted arch steel pipe piles and temporary steel truss inverted arch, are developed, which improves the construction efficiency of the inverted arch and further improves the construction quality of the primary lining of the tunnel; a temporary guiding support for the construction of external-inclined angle locking foot anchor pipes is developed. The support is placed on the core soil inside the tunnel, the external-inclined angle locking foot anchor pipes are placed on the arch beam, and the arch beam is fixed to the tunnel lining through arch beam anchor bolts, thus improving the construction effect of the installation of the primary support steel frame of the tunnel and further enhancing the overall strength and stability of the arch frame.

Description

Technical Field

[0001] The present invention belongs to the field of hydraulic tunnel construction, and particularly relates to a tunnel with combined control of large deformation of soft surrounding rock and a construction method thereof. Background Art

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

[0003] In order to solve the problem of deformation control of soft surrounding rock tunnels and ensure the safety and quality of tunnel construction, relevant researchers and constructors have developed a series of combined control technologies and construction methods for large deformation of soft surrounding rock. By means such as lining technology and reinforcement measures, the deformation of soft surrounding rock tunnels has been effectively controlled, and the stability and safety of the tunnels have been improved. However, at present, there are still some deficiencies in such methods.

[0004] Based on the realistic requirements of complex construction conditions, high construction quality, and tight construction period in engineering projects, it is urgently necessary to innovate a tunnel with combined control of large deformation of soft surrounding rock and a construction method thereof with high construction efficiency, excellent construction quality, and low safety risk, so as to improve the safety and efficiency of tunnel construction, ensure the stability and safety of the tunnel, and provide a strong guarantee for the sustainable development of tunnel projects. Summary of the Invention

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

[0006] The construction method of such a tunnel with combined control of large deformation of soft surrounding rock includes the following steps:

[0007] Step 1: Construction of the arch-foot supporting beam and arch beam type support system: After excavation, the arch beams are installed in sequence, and then the arch frames are installed on the arch frame connection plates;

[0008] Step 2: Construction of the outward-inclined angle locking anchor pipes: Install the temporary guiding support for the construction of the outward-inclined angle locking anchor pipes on the core soil, and rotate the rotating plate according to the designed angle of the anchor pipes;

[0009] Step 3: Grouting of the inverted arch steel pipe piles: Install a group of steel pipe piles at the inverted arch in the soft surrounding rock, and install the main grouting pipe and the branch grouting pipes;

[0010] Step 4: Treatment construction of the pipe shed in the collapse body: Install a protective net on the collapse body, and conduct pipe shed construction after grouting the collapse body.

[0011] Preferably, in step two, the temporary guiding support for the construction of the splayed-foot locking anchor pipe is placed on the core soil inside the tunnel. A slide rail is provided at the bottom of the temporary guiding support for the construction of the splayed-foot locking anchor pipe, fixing plates are provided on both sides of the slide rail, a baffle is provided above the slide rail, the guiding frame is placed on the slide rail through columns, and diagonal rods are arranged between the columns; a rotating plate is provided at the top of the column, a height adjusting rod is provided on the rotating plate, a guiding groove plate is provided at the top of the height adjusting rod, grooves at two angles are provided on the guiding groove plate, an anchor pipe guiding plate is arranged in the groove, an external splayed-foot locking anchor pipe is arranged on the anchor pipe guiding plate, the external splayed-foot locking anchor pipe is placed on the arch beam, and the arch beam is fixed to the tunnel lining through arch beam anchor bolts.

[0012] Preferably, in step two, slide the temporary guiding support for the construction of the splayed-foot locking anchor pipe to the designed installation position of the splayed-foot locking anchor pipe, place the anchor pipe guiding plate into the groove on the guiding groove plate, and finally install the external splayed-foot locking anchor pipe.

[0013] Preferably, the inverted arch steel pipe pile grouting and the temporary steel truss inverted arch structure in step three include an inverted arch frame and steel pipe piles. Grouting holes and grouting branch pipes are provided on the steel pipe piles, the grouting branch pipes converge on the grouting main pipe, and valves are provided on the grouting branch pipes.

[0014] Preferably, in step three, during construction, open the valve for steel pipe pile grouting according to the deformation condition of the surrounding rock at the site.

[0015] Preferably, the arch foot supporting beam and arch beam type support system in step one includes an external splayed-foot locking anchor pipe and an arch beam. An arch frame connecting plate is provided 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 provided at one end of the arch beam, and an arch beam connecting plate is provided at the other end. An arc-shaped supporting beam is provided on the arch frame on the side with small surrounding rock deformation, a supporting vertical rod is provided on the arc-shaped supporting beam, and a supporting diagonal rod is arranged between the supporting vertical rods.

[0016] Preferably, in step one, after excavation, install the arch beam in sequence and fix it with arch beam anchor bolts. Subsequently, install the arch frame on the arch frame connecting plate. When installing the arch beam, the arch beam end plate of the previous section of the arch beam is attached to the arch beam connecting plate of the next section of the arch beam and fixed with bolts.

[0017] Preferably, there is a collapse body in the tunnel. In step four, after grouting the collapse body, set up a protective net on the collapse body. After grouting the collapse body, set up anchor bolts. An arc-shaped plate is provided at the top of the anchor bolt, an auxiliary platform is provided on the arc-shaped plate, a platform cross beam is provided below the auxiliary platform plate, platform columns are provided below the platform cross beam, platform diagonal braces are arranged between the platform columns and the platform cross beam, a platform bottom plate is provided below the platform columns, and angle adjusting square timbers are provided below the platform bottom plate; carry out pipe shed construction through the auxiliary platform.

[0018] A combined control tunnel construction system for large deformation of soft surrounding rock is used to implement any of the above methods.

[0019] The beneficial effects of the present invention are:

[0020] 1) The present invention has developed an arch foot supporting beam and arch beam type supporting system, as well as a combined reinforcement technology of grouting for inverted arch steel pipe piles and temporary steel truss inverted arch, which improves the construction efficiency of the inverted arch and further improves the construction quality of the initial lining of the tunnel.

[0021] 2) The present invention has developed a temporary guiding support for the construction of outward splayed locking foot anchor pipes. The support is placed on the core soil inside the tunnel, and the outward splayed locking foot anchor pipes are placed on the arch beam, while the arch beam is fixed to the tunnel lining through arch beam anchor bolts, thereby improving the construction effect of the installation of the initial support steel frame of the tunnel and further improving the overall strength and stability of the arch frame.

[0022] 3) The present invention adopts an auxiliary platform during the construction process of treating a landslide body with pipe shed. A protective net is set in the landslide body inside the tunnel, ensuring the construction effect of treating the collapse of soft surrounding rock and improving the construction safety of the soft rock tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional schematic diagram of a tunnel with combined control of large deformation of soft surrounding rock and its construction method;

[0024] Figure 2 is a schematic diagram of the installation of a temporary guiding support for the construction of outward splayed locking foot anchor pipes;

[0025] Figure 3 is a schematic diagram of a temporary guiding support for the construction of outward splayed locking foot anchor pipes;

[0026] Figure 4 is a schematic diagram of an arch foot supporting beam and arch beam type supporting system;

[0027] Figure 5 is a diagram of the combined reinforcement technology of grouting for inverted arch steel pipe piles and temporary steel truss inverted arch;

[0028] Figure 6 is a schematic diagram of the installation of an auxiliary platform during the construction process of treating a landslide body with pipe shed;

[0029] Figure 7 is a schematic diagram of an auxiliary platform during the construction process of treating a landslide body with pipe shed.

[0030] Description of the reference numerals: 1. Tunnel; 2. Arch frame; 3. Arch beam; 4. Inclined outward foot-locking anchor pipe; 5. Arch frame connecting plate; 6. Arch beam end plate; 7. Supporting diagonal bar; 8. Supporting vertical bar; 9. Arc-shaped supporting beam; 10. Arch beam connecting plate; 11. Guide frame; 12. Slide rail; 13. Arch beam anchor rod; 14. Anchor pipe guiding plate; 15. Core soil; 16. Fixed plate; 17. Baffle plate; 18. Diagonal bar; 19. Rotating plate; 20. Height adjusting rod; 21. Guiding 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 cross beam; 29. Collapsed body; 30. Angle adjusting square timber; 31. Platform bottom plate; 32. Platform diagonal brace; 33. Protection net; 34. Arc-shaped plate; 35. Anchor rod. Detailed implementation manners

[0031] The present invention will be further described below in conjunction with embodiments. The descriptions of the following embodiments are only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0032] Embodiment 1

[0033] As an embodiment, as Figures 1 to 7 shown, this construction system for a large-deformation combined control tunnel in soft surrounding rock mainly involves a temporary guiding support for the construction of inclined outward foot-locking anchor pipes, an arch-foot supporting beam and arch-beam type support, an auxiliary platform during the construction process of treating the pipe shed in the collapsed body, and a combined reinforcement technology of inverted arch steel pipe pile grouting and temporary steel truss inverted arch, and mainly includes a tunnel 1, an arch frame 2, an arch beam 3, an inclined outward foot-locking anchor rod 4, a guide frame 11, a steel pipe pile 23, an auxiliary platform 28, etc.

[0034] As Figure 3 shown, the temporary guiding support for the construction of the inclined outward foot-locking anchor pipe 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, a baffle plate 17 is arranged on the upper part, the columns of the guide frame 11 are placed on the slide rail 1, diagonal bars 18 are arranged between the columns, a rotating plate 19 is arranged at the top, a height adjusting rod 20 is arranged on the rotating plate 19, a guiding plate groove 21 is arranged at the top of the height adjusting rod 20, two-angle grooves are arranged on the guiding plate groove, an anchor pipe guiding plate 14 is arranged in the groove, an inclined outward foot-locking anchor pipe 4 is arranged on the anchor pipe guiding plate 14, and the inclined outward foot-locking 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 arch beam anchor rods.

[0035] As Figure 4As shown in the figure, the arch-foot supporting beam and arch beam type support mainly involves the outer eight-shaped foot-locking anchor pipe 4, 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. One end of the arch beam is provided with an arch beam end plate 6, and the other end is provided with an arch beam connecting plate 10. An arc-shaped supporting beam 9 is arranged on the arch frame on the side with small surrounding rock deformation. A supporting vertical rod 8 is arranged on the arc-shaped supporting beam 9, and a supporting diagonal rod 7 is arranged between the supporting vertical rods.

[0036] As Figure 5 shown in the figure, the combined reinforcement technology of inverted arch steel pipe pile grouting and temporary steel truss inverted arch mainly includes an inverted arch frame 23 and steel pipe piles 22. Grouting holes and grouting branch pipes 24 are arranged on the steel pipe piles. The grouting branch pipes converge on a grouting main pipe 26, and valves 25 are arranged on the grouting branch pipes.

[0037] As Figure 6 and Figure 7 shown in the figure, when there is a landslide body 29 in the tunnel 1, a protective net is arranged on the landslide body 29. After the landslide body is grouted, anchor rods 35 are arranged. An arc-shaped plate 34 is arranged at the top of the anchor rod. An auxiliary platform 27 is arranged on the arc-shaped plate 34. A platform cross beam 28 is arranged below the auxiliary platform plate. A platform diagonal brace 32 is arranged between the platform cross beam and the platform column. A platform bottom plate is arranged at the bottom of the platform. Angle-adjusting square timbers 30 are arranged below the platform bottom plate.

[0038] Embodiment 2

[0039] As another embodiment, this Embodiment 2 is proposed on the basis of Embodiment 1. The construction method of the soft surrounding rock large deformation combined control tunnel using this construction system includes the following steps:

[0040] Step 1: Construction of the arch-foot supporting beam and arch beam type support system: After excavation, the arch beam 3 is installed in sequence, and then the arch frame 2 is installed on the arch frame connecting plate 5.

[0041] Step 2: Construction of the outer eight-shaped foot-locking anchor pipe: As Figures 1 to 3 shown in the figure, a temporary guiding support for the construction of the eight-shaped foot-locking anchor pipe is installed on the core soil 15, and the rotating plate 19 is rotated according to the designed angle of the anchor pipe 4; the temporary guiding support for the construction of the eight-shaped foot-locking anchor pipe is placed on the core soil 15 inside the tunnel 1. A slide rail 12 is arranged at the bottom of the temporary guiding support for the construction of the eight-shaped foot-locking anchor pipe. Fixed plates 16 are arranged on both sides of the slide rail 12. A baffle 17 is arranged above the slide rail 12. The guiding frame 11 is placed on the slide rail 12 through columns. Diagonal rods 18 are arranged between the columns; a rotating plate 19 is arranged at the top of the column. A height adjusting rod 20 is arranged on the rotating plate 19. A guiding groove plate 21 is arranged at the top of the height adjusting rod 20. Grooves with two angles are arranged on the guiding groove plate 21. Anchor pipe guiding plates 14 are arranged in the grooves. The outer eight-shaped foot-locking anchor pipe 4 is arranged on the anchor pipe guiding plate 14. The outer eight-shaped foot-locking 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 arch beam anchor rods 13.

[0042] Slide the temporary guiding support for the construction of the splayed-foot locking anchor pipe to the designed installation position of the splayed-foot locking anchor pipe 4, place the anchor pipe guiding plate 14 into the groove on the guiding groove plate 21, and finally install the outer splayed-foot locking anchor pipe 4.

[0043] Step 3: Grouting of the inverted arch steel pipe piles: As Figure 5 shown, install a group of steel pipe piles 22 at the inverted arch in the soft surrounding rock, and install the grouting main pipe 26 and the grouting branch pipe 24.

[0044] Step 4: Treatment construction of the pipe shed at the landslide body 29: As Figure 6 shown, install a protective net 33 on the landslide body 29, and carry out pipe shed construction after grouting the landslide body 29.

[0045] It should be noted that the parts that are the same or similar to those in Embodiment 1 in this embodiment can be referred to each other, and will not be elaborated in this application.

[0046] Embodiment 3

[0047] As another embodiment, this Embodiment 3 is proposed on the basis of Embodiment 2, and a construction method for a tunnel with combined control of large deformation of soft surrounding rock using a more specific construction system:

[0048] In Step 1, as Figure 3 and Figure 4 shown, the arch-foot supporting beam arch beam type supporting system includes the outer splayed-foot locking anchor pipe 4 and the arch beam 3. An arch frame connecting plate 5 is arranged on the arch beam 3, and 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-shaped supporting beam 9 is arranged on the arch frame 2 on the side with small surrounding rock deformation, a supporting vertical rod 8 is arranged on the arc-shaped supporting beam 9, and a supporting diagonal rod 7 is arranged between the supporting vertical rods 8.

[0049] After excavation, install the arch beam 3 in sequence and fix it with the arch beam anchor bolt 13. Subsequently, install the arch frame 2 on the arch frame connecting plate 5. When installing the arch beam 3, the arch beam end plate of the previous section of the arch beam is attached to the arch beam connecting plate 10 of the next section of the arch beam and fixed with bolts.

[0050] In Step 3, as Figure 5 shown, the grouting of the inverted arch steel pipe piles and the temporary steel truss inverted arch structure include an inverted arch frame 23 and steel pipe piles 22. Grouting holes and grouting branch pipes 24 are arranged on the steel pipe piles 22. The grouting branch pipes 24 converge on the grouting main pipe 26, and valves 25 are arranged on the grouting branch pipes 24.

[0051] During construction, open the valve 25 to grout the steel pipe piles 22 according to the deformation situation of the surrounding rock on site.

[0052] As Figure 6 and Figure 7As shown, there is a landslide body 29 in the tunnel 1. In step four, after grouting the landslide body 29, a protective net 33 is set on the landslide body 29. After grouting the landslide body 29, anchor rods 35 are set, an arc-shaped plate 34 is set at the top of the anchor rod, an auxiliary platform 27 is set on the arc-shaped plate 34, a platform cross beam 28 is set under the plate of the auxiliary platform 27, platform columns are set below the platform cross beam 28, platform diagonal braces 32 are set between the platform columns and the platform cross beam 28, a platform bottom plate 31 is set below the platform columns, and angle-adjustable square timbers 30 are set below the platform bottom plate 31; pipe shed construction is carried out through the auxiliary platform 27.

[0053] It should be noted that the same or similar parts in this embodiment and Embodiment II can be referred to each other and will not be elaborated in this application.

[0054] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

Claims

1. A construction method for a tunnel with large deformation of soft surrounding rock under combined control, characterized in that It includes the following steps: Step 1. Construction of the arch-foot supporting beam and arch beam type supporting system: After excavation, install the arch beams in sequence, and then install the arch frames on the connecting plates of the arch frames; Step 2. Construction of the outward-inclined angle locking foot anchor pipes: Install the temporary guiding support for the construction of the outward-inclined angle locking foot anchor pipes on the core soil, and rotate the rotating plate according to the designed angle of the anchor pipes; Step 3. Combined reinforcement of the inverted arch steel pipe piles grouting and the temporary steel truss inverted arch: Install a group of steel pipe piles at the inverted arch in the soft surrounding rock, and install the main grouting pipe and the branch grouting pipes; Step 4. Treatment construction of the landslide pipe shed: Install a protective net on the landslide, and carry out the pipe shed construction after grouting the landslide; In Step 2, the temporary guiding support for the construction of the outward-inclined angle locking foot anchor pipes is placed on the core soil inside the tunnel. A slide rail is arranged at the bottom of the temporary guiding support for the construction of the outward-inclined angle locking foot anchor pipes. Fixed plates are arranged on both sides of the slide rail. A baffle is arranged on the upper part of the slide rail. Columns are placed on the slide rail. Diagonal rods are arranged between the columns; A rotating plate is arranged at the top of the column. A height adjusting rod is arranged on the rotating plate. A guiding groove plate is arranged at the top of the height adjusting rod. Grooves with two angles are arranged on the guiding groove plate. Anchor pipe guiding plates are arranged in the grooves. The outward-inclined angle locking foot anchor pipes are arranged on the anchor pipe guiding plates. The outward-inclined angle locking foot anchor pipes are placed on the arch beam. The arch beam is fixed to the tunnel lining through arch beam anchor bolts; The arch-foot supporting beam and arch beam type supporting system in Step 1 includes the outward-inclined angle locking foot anchor pipes and the 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 supporting beam is arranged on the arch frame on the side with small surrounding rock deformation. A supporting vertical rod is arranged on the arc-shaped supporting beam. Supporting diagonal rods are arranged between the supporting vertical rods.

2. The construction method of the tunnel with large deformation combination control in soft surrounding rock according to claim 1, characterized in that In Step 2, slide the temporary guiding support for the construction of the outward-inclined angle locking foot anchor pipes to the designed installation position of the outward-inclined angle locking foot anchor pipes, put the anchor pipe guiding plate into the groove on the guiding groove plate, and finally install the outward-inclined angle locking foot anchor pipes.

3. The construction method of the tunnel with large deformation combination control in soft surrounding rock according to claim 1, characterized in that, The structure of the combined reinforcement of the inverted arch steel pipe piles grouting and the temporary steel truss inverted arch in Step 3 includes an inverted arch frame and steel pipe piles. Grouting holes and branch grouting pipes are arranged on the steel pipe piles. The branch grouting pipes converge on the main grouting pipe. Valves are arranged on the branch grouting pipes.

4. The construction method of the tunnel with large deformation combination control in soft surrounding rock according to claim 3, characterized in that, In Step 3, during construction, open the valve to carry out grouting of the steel pipe piles according to the deformation situation of the on-site surrounding rock.

5. The construction method of the tunnel with combined control of large deformation of soft surrounding rock according to claim 4, characterized in that, In Step 1, after excavation, install the arch beams in sequence and fix them with arch beam anchor bolts. Then install the arch frames on the arch frame connecting plates. When installing the arch beams, the arch beam end plate of the previous section of the arch beam fits the arch beam connecting plate of the next section of the arch beam and is fixed with bolts.

6. The construction method of the tunnel with large deformation combination control in soft surrounding rock according to claim 1, characterized in that, There is a landslide in the tunnel. In Step 4, after grouting the landslide, set a protective net on the landslide. After grouting the landslide, set anchor bolts. An arc-shaped plate is arranged at the top of the anchor bolts. An auxiliary platform is arranged on the arc-shaped plate. A platform cross beam is arranged below the auxiliary platform. Platform columns are arranged below the platform cross beam. Platform diagonal braces are arranged between the platform columns and the platform cross beam. A platform bottom plate is arranged below the platform columns. Angle adjusting square timbers are arranged below the platform bottom plate; Carry out the pipe shed construction through the auxiliary platform.

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