Combined anchor cable suitable for tunnel lining and construction technology of combined anchor cable

Abstract

The combined anchor cable suitable for the tunnel lining comprises a supporting assembly, a tunnel pilot tunnel and a reinforced surrounding rock layer, the reinforced surrounding rock layer is arranged on the inner ring wall of the tunnel pilot tunnel, and the supporting assembly comprises a traction anchor cable, a first abutting plate and a supporting pipe; a plurality of anchor cable connecting holes are formed in the inner wall of the tunnel pilot tunnel in the circumferential direction, one traction anchor cable is connected to each anchor cable connecting hole, one end of each traction anchor cable extends into the reinforced surrounding rock layer in the thickness direction of the reinforced surrounding rock layer, and the rod sections, located on the reinforced surrounding rock layer, of the traction anchor cables are sleeved with the supporting pipes; the first abutting plate is connected to one end of the supporting pipe, the first abutting plate is arranged at the joint between the reinforced surrounding rock layer and the inner wall of the tunnel pilot tunnel, and a set of traction assembly is arranged between every two adjacent traction anchor cables. The method has the effects of improving the tunnel construction quality and the anchor cable supporting strength.

Description

Technical Field

[0001] The present application relates to the technical field of tunnel construction, and in particular to a combined anchor cable suitable for tunnel lining and a construction process thereof. Background Art

[0002] The initial support and secondary lining in the tunnel structure are important components of tunnel engineering, and they each have different functions and roles. The initial support is the first support structure constructed after tunnel excavation. Its main function is to withstand the early surrounding rock pressure and help the surrounding rock achieve basic stability during construction, thereby ensuring the safety of the tunnel during construction. According to different geological conditions and construction requirements, the initial support can be divided into many types, such as anchor spraying support, advanced support, etc.

[0003] The secondary lining is a cast concrete or reinforced concrete lining built inside the primary support, which together with the primary support forms a composite lining. The main functions of the secondary lining are to strengthen the support, optimize the route drainage system and beautify the appearance to meet the requirements of modern highway tunnel construction.

[0004] In summary, primary support and secondary lining are important components of tunnel structure, and they jointly undertake the important task of ensuring the safety and stability of the tunnel during construction and operation.

[0005] In order to ensure the safety of tunnel operation, it is usually necessary to set up a number of anchor cables for supporting traction inside the tunnel. The outer anchoring ends of the anchor cables may become loose after a period of use, thus affecting the safety of the tunnel structure. Summary of the invention

[0006] In order to improve the tunnel construction quality and anchor cable support strength, the present application provides a combined anchor cable suitable for tunnel lining and a construction process thereof.

[0007] The present application provides a combined anchor cable suitable for tunnel lining and its construction process adopts the following technical solution: A combined anchor cable suitable for tunnel lining, comprising a supporting assembly, a tunnel guide and a reinforced surrounding rock layer, wherein the reinforced surrounding rock layer is arranged on the inner annular wall of the tunnel guide, the supporting assembly comprises a pulling anchor cable, a first abutment plate and a supporting tube, a plurality of anchor cable connection holes are opened on the inner wall of the tunnel guide along the circumferential direction, and one pulling anchor cable is connected to each of the anchor cable connection holes, one end of the pulling anchor cable extends into the reinforced surrounding rock layer along the thickness direction of the reinforced surrounding rock layer, the supporting tube is sleeved on the rod section of the pulling anchor cable located in the reinforced surrounding rock layer, the first abutment plate is connected to one end of the supporting tube, the first abutment plate is arranged at the joint between the reinforced surrounding rock layer and the inner wall of the tunnel guide, and a group of pulling assemblies is arranged between two adjacent pulling anchor cables.

[0008] By adopting the above technical solution, the support pipe supports and protects the pulling anchor cable, and the first abutment plate is clamped between the inner wall of the tunnel guide hole and the reinforced surrounding rock layer, thereby improving the connection strength between the pulling anchor cable and the tunnel structure. The pulling anchor cable is connected to the underground through the anchor cable connection hole, and a group of pulling components are arranged between two adjacent pulling anchor cables, connecting several pulling anchor cables into a whole, which helps to further improve the connection strength of the combined anchor cable. Through the mutual cooperation of the support component, the tunnel guide hole and the reinforced surrounding rock layer, the tunnel construction quality and the anchor cable support strength are improved.

[0009] Optionally, the pulling assembly includes a pulling screw and an adjusting sleeve rod, each of the support tubes is provided with a mounting ring plate, the inner wall of the adjusting sleeve rod is provided with an internal thread, the internal threads at both ends of the adjusting sleeve rod have opposite rotation directions, and the pulling screw is threadedly connected with one at both ends of the adjusting sleeve rod, and the end of the pulling screw extends out of the adjusting sleeve rod and is connected to the corresponding mounting ring plate.

[0010] By adopting the above technical solution, one end of the pulling screw is connected to the mounting ring plate, and the other end is threadedly connected to the adjusting sleeve rod. According to different support tube spacings, the adjusting sleeve rod is screwed, and the two pulling screws move toward or away from each other, thereby adjusting the overall length of the pulling assembly so that it can be suitable for the spacing between adjacent support tubes.

[0011] Optionally, the pulling assembly also includes a pulling rod, the pulling screw is hollow, and the pulling screw is slidably arranged in the pulling screw outside the adjusting sleeve, one end of the pulling rod extends out of the pulling screw and is rotatably connected to the corresponding mounting ring plate, a sliding block is provided on the pulling rod, a sliding groove is opened on the pulling screw along the length direction, the sliding block is slidably connected to the corresponding sliding groove, a pulling spring is provided inside the pulling screw, one end of the pulling spring is connected to the inner bottom wall of the pulling screw cavity, and the other end is connected to the end of the pulling rod located in the pulling screw cavity.

[0012] By adopting the above technical solution, the arrangement of the pulling rod and the pulling spring enables the overall length of the pulling assembly to adapt to the slight deformation between the support tubes.

[0013] Optionally, the support assembly also includes a second abutment plate, which is annular and has an inner ring wall connected to a plug-in ring, which is inserted into the support tube, and a fastening bolt is threadedly connected to the pulling anchor cable, which abuts against the second abutment plate, and the second abutment plate abuts against the inner wall of the reinforced surrounding rock layer.

[0014] By adopting the above technical solution, the second abutment plate abuts against the inner wall of the reinforced surrounding rock layer, thereby achieving support and limiting of the support pipe. The pulling anchor cable is fixed by tightening the bolts and a certain prestress is applied to the pulling anchor cable, which helps to improve the overall strength and stability of the structure.

[0015] Optionally, a plurality of anti-pull-out ring plates are connected to the support tube, and a plurality of connecting holes are formed on the anti-pull-out ring plates.

[0016] By adopting the above technical solution, the provision of the anti-pulling ring plate and the connecting hole improves the connection strength between the support pipe and the reinforced surrounding rock layer, and reduces the possibility of the support pipe escaping from the reinforced surrounding rock layer.

[0017] Optionally, a supporting mesh layer is provided on the inner wall of the reinforced surrounding rock layer, the supporting mesh layer is sandwiched between the second abutment plate and the reinforced surrounding rock layer, and a waterproof layer is provided on the side of the supporting mesh layer away from the reinforced surrounding rock layer.

[0018] By adopting the above technical solution, the provision of the supporting mesh layer reduces the possibility of the reinforced surrounding rock layer breaking or falling, and the provision of the waterproof layer reduces the possibility of groundwater infiltrating into the tunnel body.

[0019] Optionally, the diameter of the anchor cable connection hole is larger than the diameter of the pulling anchor cable, and a mortar anchor is filled between the cable installation hole and the pulling anchor cable.

[0020] By adopting the above technical solution, the mortar coagulant is condensed between the anchor cable connection hole and the pull anchor cable, thereby improving the connection strength between the pull anchor cable and the anchor cable connection hole.

[0021] A construction process for a combined anchor cable suitable for tunnel lining comprises the following steps: S1: Anchor cable installation: multiple anchor cable connection holes are opened on the inner wall of the tunnel pilot hole, and mortar anchoring agent is poured into them, and the pulling anchor cable is spirally anchored into the anchor cable connection holes; S2: Anchor cable support and pulling: The support tube is sleeved on the rod section of the pulling anchor cable located in the tunnel guide hole, and the first abutment plate is abutted against the inner wall of the tunnel guide hole, the two connecting rods are connected to the two adjacent support tubes, and the adjustment sleeve rod is screwed to adjust the overall length of the pulling assembly; S3: Casting of surrounding rock: Casting of a reinforced surrounding rock layer on the inner wall of the tunnel pilot hole, with the thickness of the reinforced surrounding rock layer being consistent with the length of the support pipe; S4: Waterproof treatment: Lay the supporting mesh layer on the inner wall of the reinforced surrounding rock layer, sleeve the second abutment rod on the pulling anchor cable, apply a certain amount of prestress to the pulling anchor cable, and connect the fastening bolts to the rod section of the pulling anchor cable located outside the supporting tube, so that the fastening bolts are tightly pressed against the second abutment plate, and the waterproof layer is connected to the inner wall of the supporting mesh layer.

[0022] By adopting the above technical solution, the connection strength and structural stability between the pulling anchor cable and the soil and the strengthening anchor cable layer are improved by first installing the pulling anchor cable and then casting the strengthening surrounding rock layer.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the coordination of support components, tunnel guide holes and strengthening of surrounding rock layers, it has the effect of improving tunnel construction quality and anchor cable support strength; 2. The second abutment plate abuts against the inner wall of the reinforced surrounding rock layer to achieve the support limit of the support pipe. The pulling anchor cable is fixed by tightening the bolts and a certain prestress is applied to the pulling anchor cable, which helps to improve the overall strength and stability of the structure; 3. By installing the tension anchor cable first and then casting the reinforced surrounding rock layer, the connection strength and structural stability between the tension anchor cable and the soil and the reinforced anchor cable layer are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a combined anchor cable suitable for tunnel lining according to an embodiment of the present application.

[0025] Figure 2 It is a partial cross-sectional view used to illustrate the support assembly in the embodiment of the present application.

[0026] Figure 3 yes Figure 2 Enlarged view of part A in the middle.

[0027] Figure 4 It is a structural schematic diagram used to reflect the connection structure of the pulling component in the embodiment of the present application.

[0028] Figure 5 yes Figure 4 Enlarged view of part B in the middle.

[0029] Figure 6 yes Figure 4 Enlarged view of part C in the middle.

[0030] Explanation of the reference numerals: 1. Tunnel guide hole; 2. Strengthening surrounding rock layer; 3. Support assembly; 31. Pulling anchor cable; 32. First abutment plate; 33. Support tube; 34. Anti-pullout ring plate; 341. Connecting hole; 35. Mounting ring plate; 351. Mounting hole; 36. Support rib plate; 37. Second abutment plate; 38. Fastening bolt; 39. Gasket; 4. Pulling assembly; 41. Snap-in block; 411. Snap-in groove; 412. Plug-in hole; 42. Pin; 43. Pulling rod; 44. Sliding block; 45. Pulling screw; 46. Pulling spring; 47. Adjusting sleeve; 5. Anchor cable connecting hole; 6. Mortar anchor; 7. Tension sensor; 8. Plug-in ring; 9. Support mesh layer; 10. Waterproof layer; 11. Sliding groove. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-6 The present application is further described in detail. The present application provides a combined anchor cable and a construction process thereof suitable for tunnel lining, which has the effect of improving the tunnel construction quality and the anchor cable support strength.

[0032] Reference Figure 1 and Figure 2 A combined anchor cable suitable for tunnel lining includes a tunnel guide 1, a reinforced surrounding rock layer 2, a support component 3 and a pulling component 4.

[0033] Reference Figure 1-3 The support assembly 3 is arranged on the tunnel guide 1, and the support assembly 3 includes a pulling anchor cable 31, a first abutment plate 32, a support tube 33, an anti-pulling ring plate 34, a mounting ring plate 35, a support rib plate 36, a second abutment plate 37, a fastening bolt 38 and a gasket 39. A plurality of anchor cable connection holes 5 are opened on the inner wall of the tunnel guide 1 along the circumferential direction, and the setting direction of the anchor cable connection holes 5 is perpendicular to the inner wall of the tunnel guide 1. The inner diameter of the anchor cable connection hole 5 is larger than the diameter of the pulling anchor cable 31, and the interior of the anchor cable connection hole 5 is poured with a mortar anchor 6, and one end of the pulling anchor cable 31 is connected to the anchor cable connection hole 5. The first abutment plate 32 is annular, and the inner ring wall of the first abutment plate 32 is vertically connected to one end of the support tube 33, and the length of the support tube 33 is consistent with the thickness of the reinforced surrounding rock layer 2.

[0034] Reference Figure 3 The support tube 33 is sleeved on the pulling anchor cable 31, and the first abutment plate 32 is arranged in contact with the inner wall of the tunnel guide hole 1. A plurality of anti-pulling ring plates 34 are connected to the support tube 33 along the length direction, and a plurality of connecting holes 341 are opened on the anti-pulling ring plate 34. A plurality of support ribs 36 are connected to the outer ring wall of the support tube 33 along the length direction thereof at equal intervals, and the length of the support ribs 36 is equal to the length of the support tube 33.

[0035] Reference Figure 2 , Figure 4 and Figure 5 A group of pulling components 4 is provided between two adjacent support tubes 33, and the pulling components 4 include a clamping block 41, a latch 42, a pulling rod 43, a sliding block 44, a pulling screw 45, a pulling spring 46 and an adjusting sleeve 47. A mounting ring plate 35 is connected to each support tube 33, and a plurality of mounting holes 351 are provided on the mounting ring plate 35 along the circumferential direction. An internal thread is provided inside the adjusting sleeve 47, and the internal threads at both ends of the adjusting sleeve 47 are rotated in opposite directions. A pulling screw 45 is provided at each end of the adjusting sleeve 47, and the two pulling screws 45 correspond to the internal threads at both ends of the adjusting sleeve 47 one by one and are threadedly connected. The interior of the pulling screw 45 is hollow, and the two pulling screws 45 are open on the sides away from each other, and a pulling rod 43 is slidably provided inside each pulling screw 45. A pulling screw 45 extends out from one end of the pulling rod 43, and a sliding block 44 is fixedly connected to the pulling rod 43. A sliding groove 11 is provided on the pulling screw 45 along its length direction, and the sliding block 44 is slidably provided in the corresponding sliding groove 11. A pulling spring 46 is provided in the inner cavity of the pulling screw 45 along its length direction, and one end of the pulling spring 46 is connected to the end of the pulling rod 43, and the other end is connected to the inner wall of the pulling screw 45 away from the end of the pulling rod 43, and a tension sensor 7 is provided on the inner bottom wall of the pulling screw 45.

[0036] Reference Figure 4 and Figure 6 A clamping block 41 is provided at one end of the pulling rod 43 extending from the pulling screw 45. The clamping block 41 is rotatably connected and locked with the end of the pulling rod 43 by means of a bolt and screw. The clamping block 41 is provided with a clamping groove 411 for accommodating the mounting ring plate 35. The clamping block 41 is provided with a plug hole 412. The plug hole 412 is connected to and vertically arranged with respect to the clamping groove 411. The clamping block 41 is clamped to the edge of the mounting ring plate 35 through the clamping groove 411. The plug hole 412 is connected to one of the mounting holes 351 on the mounting ring plate 35. The latch 42 is inserted into the plug hole 412, the mounting hole 351 and the plug hole 412 at the same time.

[0037] Reference Figure 4 The second abutment plate 37 is annular, and a plug ring 8 is coaxially fixedly connected to the inner ring wall of one side of the second abutment plate 37, and the plug ring 8 is inserted in the support tube 33, and one side of the second abutment plate 37 abuts against the support tube 33. One side of the second abutment plate 37 abuts against the inner wall of the reinforced surrounding rock layer 2, and a fastening bolt 38 is threadedly connected to the rod section of the pulling anchor cable 31 located inside the reinforced surrounding rock layer 2, and the fastening bolt 38 is tightly abutted against the second abutment plate 37. A gasket 39 is sleeved on the pulling anchor cable 31, and the gasket 39 is sandwiched between the reinforced surrounding rock layer 2 and the fastening bolt 38, and a prestress is applied to the pulling anchor cable 31.

[0038] Reference Figure 3A support mesh layer 9 is laid on the inner wall of the reinforced surrounding rock layer 2, and the support mesh layer 9 is located between the gasket 39 and the reinforced surrounding rock layer 2. A waterproof layer 10 is arranged on the side of the support mesh layer 9 away from the reinforced surrounding rock layer 2.

[0039] A construction process for a combined anchor cable suitable for tunnel lining includes the following steps: Anchor cable installation: a plurality of anchor cable connection holes 5 with a certain depth are opened along the circumferential direction on the inner wall of the tunnel pilot hole 1, mortar anchoring agent 6 is poured into the anchor cable connection holes 5, and one end of the pulling anchor cable 31 is connected to the anchor cable connection hole 5 by means of spiral advancement; Anchor cable support and pulling: A support tube 33 is sleeved on each pulling anchor cable 31, and the first abutment plate 32 at one end of the support tube 33 is abutted against the inner ring wall of the tunnel guide hole 1. The clamping block 41 is inserted into the edge of the mounting ring plate 35 through the clamping groove 411, and the plug 42 is inserted into the plug hole 412 and the corresponding mounting hole 351 to achieve the connection between the clamping block 41 and the mounting ring plate 35, and the angle between the clamping block 41 and the pulling rod 43 is adjusted, and the angle between the two is fixed with a bolt and a screw. The adjusting sleeve 47 is screwed, and the two pulling screws 45 are driven by the adjusting sleeve 47 to move in the direction of approaching or moving away from each other until the overall length of the pulling assembly 4 corresponds to the spacing between two adjacent support tubes 33.

[0040] Surrounding rock pouring: pour the reinforced surrounding rock layer 2 on the inner wall of the tunnel guide 1, and control the thickness of the reinforced surrounding rock layer 2 to be consistent with the length of the support pipe 33. Concrete pouring is carried out by the intelligent lining trolley, which is equipped with an intelligent vibration system and a monitoring system to fully vibrate the poured concrete to avoid problems such as honeycomb and pockmarks on its surface and inside. The monitoring system can monitor the concrete pouring volume and formwork pressure, confirm the pouring status by analyzing the pouring time and pouring volume, ensure the pouring quality and construction safety, and help improve the quality of tunnel secondary lining construction.

[0041] Waterproof treatment: a supporting mesh layer 9 is laid on the inner wall of the cast reinforced surrounding rock layer 2, a second abutment plate 37 is sleeved on the rod section on the pulling anchor cable 31, and a gasket 39 is sleeved on the rod section on the pulling anchor cable 31. A specific vertical prestress is applied to the extended portion of the pulling anchor cable 31, and a fastening bolt 38 is connected to the pulling anchor cable 31 to make it abut against the gasket 39. Excess pulling anchor cables 31 are cut off, and a waterproof layer 10 is laid on the inner side of the supporting mesh layer 9, and the waterproof layer 10 covers the end of the pulling anchor cable 31.

[0042] Referring to the figure, the support pipe 33 is arranged in the reinforced surrounding rock layer 2, so as to support and protect the pulling anchor cable 31 and reduce the possibility of the pulling anchor cable 31 being damaged during use. The anti-pull-out ring plate 34 is located in the reinforced surrounding rock layer 2, which improves the connection strength between the pulling anchor cable 31 and the geological layer and the reinforced surrounding rock layer 2. A plurality of connecting holes 341 are arranged on the anti-pull-out ring plate 34, so that when pouring concrete, the concrete can pass through the connecting holes 341, further improving the connection strength between the anti-pull-out ring plate 34 and the reinforced surrounding rock layer 2. The provision of the support ribs 36 improves the structural strength of the support pipe 33. The first abutment plate 32 is located between the inner wall of the tunnel guide 1 and the reinforced surrounding rock layer 2, further improving the connection strength between the support pipe 33 and the pulling anchor cable 31.

[0043] Reference Figure 2 , Figure 4 and Figure 5 The pulling assembly 4 is connected between two adjacent support tubes 33, connecting several support tubes 33 into a whole, thereby enhancing the structural stability of the combined anchor cable. The setting of the tension sensor 7 facilitates the operator to observe the overall tension of the pulling assembly 4. The setting of the pulling spring 46, the sliding block 44 and the sliding groove 11 enables the pulling assembly 4 to be adapted to the slight deformation of the spacing between the support tubes 33. The setting of the clamping block 41 and the latch 42 realizes the quick connection between the pulling rod 43 and the support tube 33. The setting of the adjusting sleeve 47 realizes the adjustment of the overall length of the pulling assembly 4, so that the pulling assembly 4 can be adapted to different spacings between the support tubes 33.

[0044] Reference Figure 2 and Figure 3 The supporting mesh layer 9 covers the inner wall of the reinforced surrounding rock layer 2, thereby improving the integrity of the reinforced surrounding rock layer 2 and reducing the possibility of the reinforced surrounding rock layer 2 breaking or falling. The second abutment plate 37 supports and squeezes the inner wall of the reinforced surrounding rock layer 2 through the fastening bolts 38, further strengthening the structural strength of the reinforced surrounding rock layer 2. The provision of the gasket 39 reduces the pressure of the fastening bolts 38 on the second abutment plate 37. The waterproof layer 10 is provided on the innermost side, which helps to improve the waterproof performance of the tunnel structure and helps to reduce the possibility of groundwater infiltration into the tunnel. The mortar anchor 6 solidifies in the annular gap between the anchor cable connection hole 5 and the pulling anchor cable 31, which helps to improve the connection strength between the end of the pulling anchor cable 31 and the anchor cable connection hole 5.

[0045] The implementation principle of a combined anchor cable and its construction process suitable for tunnel lining in the embodiment of the present application is as follows: the support tube 33 is arranged in the reinforced surrounding rock layer 2, so as to realize the support and protection of the pulling anchor cable 31 and reduce the possibility of damage to the pulling anchor cable 31 during use. The anti-pulling ring plate 34 is located in the reinforced surrounding rock layer 2, which improves the connection strength between the pulling anchor cable 31 and the geological layer and the reinforced surrounding rock layer 2. The first abutment plate 32 is located between the inner wall of the tunnel guide hole 1 and the reinforced surrounding rock layer 2, which further improves the connection strength between the support tube 33 and the pulling anchor cable 31. The pulling assembly 4 is connected between two adjacent support tubes 33, connecting several support tubes 33 into a whole, and enhancing the structural stability of the combined anchor cable. The second abutment plate 37 supports and squeezes the inner wall of the reinforced surrounding rock layer 2 through the fastening bolts 38, thereby further strengthening the structural strength of the reinforced surrounding rock layer 2.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A combined anchor cable suitable for tunnel lining, characterized in that: The invention comprises a support assembly (3), a tunnel guide hole (1) and a reinforced surrounding rock layer (2), wherein the reinforced surrounding rock layer (2) is arranged on the inner ring wall of the tunnel guide hole (1), the support assembly (3) comprises a pulling anchor cable (31), a first abutment plate (32) and a support pipe (33), a plurality of anchor cable connection holes (5) are opened on the inner wall of the tunnel guide hole (1) along the circumferential direction, and one pulling anchor cable (31) is connected to each of the anchor cable connection holes (5), and one end of the pulling anchor cable (31) is connected to the inner ring wall of the tunnel guide hole (1). The support tube (33) extends into the reinforced surrounding rock layer (2) along the thickness direction of the reinforced surrounding rock layer (2), the support tube (33) is sleeved on the rod section of the pulling anchor cable (31) located in the reinforced surrounding rock layer (2), the first abutment plate (32) is connected to one end of the support tube (33), the first abutment plate (32) is arranged at the joint between the reinforced surrounding rock layer (2) and the inner wall of the tunnel guide hole (1), and a group of pulling components (4) is arranged between two adjacent pulling anchor cables (31).

2. A combined anchor cable suitable for tunnel lining according to claim 1, characterized in that: The pulling assembly (4) comprises a pulling screw (45) and an adjusting sleeve (47), and each of the support tubes (33) is provided with a mounting ring plate (35). The inner wall of the adjusting sleeve (47) is provided with an internal thread, and the internal threads at both ends of the adjusting sleeve (47) are screwed in opposite directions. The pulling screw (45) is threadedly connected with one end at both ends of the adjusting sleeve (47), and the end of the pulling screw (45) extends out of the adjusting sleeve (47) and is connected to the corresponding mounting ring plate (35).

3. A combined anchor cable suitable for tunnel lining according to claim 2, characterized in that: The pulling assembly (4) also includes a pulling rod (43), the pulling screw (45) is hollow, and the pulling screw (45) is located outside the adjusting sleeve and a pulling rod (43) is slidably arranged in the pulling screw (45), one end of the pulling rod (43) extends out of the pulling screw (45) and is rotatably connected to the corresponding mounting ring plate (35), a sliding block (44) is arranged on the pulling rod (43), a sliding groove (11) is opened on the pulling screw (45) along the length direction, and the sliding block (44) is slidably connected to the corresponding sliding groove (11), and a pulling spring (46) is arranged inside the pulling screw (45), one end of the pulling spring (46) is connected to the inner bottom wall of the inner cavity of the pulling screw (45), and the other end is connected to the end of the pulling rod (43) located in the inner cavity of the pulling screw (45).

4. A combined anchor cable suitable for tunnel lining according to claim 3, characterized in that: The support assembly (3) further comprises a second abutment plate (37), the second abutment plate (37) being annular, a plug-in ring (8) being connected to the inner ring wall of the second abutment plate (37), the plug-in ring (8) being inserted into the support tube (33), a fastening bolt (38) being threadedly connected to the pulling anchor cable (31), the fastening bolt (38) being in abutment with the second abutment plate (37), and the second abutment plate (37) being in abutment with the inner wall of the reinforced surrounding rock layer (2).

5. A combined anchor cable suitable for tunnel lining according to claim 4, characterized in that: A plurality of anti-pulling ring plates (34) are connected to the support tube (33), and a plurality of connecting holes (341) are provided on the anti-pulling ring plates (34).

6. A combined anchor cable suitable for tunnel lining according to claim 5, characterized in that: A supporting mesh layer (9) is provided on the inner wall of the reinforced surrounding rock layer (2), the supporting mesh layer (9) is sandwiched between the second abutment plate (37) and the reinforced surrounding rock layer (2), and a waterproof layer (10) is provided on the side of the supporting mesh layer (9) away from the reinforced surrounding rock layer (2).

7. A combined anchor cable suitable for tunnel lining according to claim 6, characterized in that: The diameter of the anchor cable connection hole (5) is greater than the diameter of the pulling anchor cable (31), and a mortar anchoring agent (6) is filled between the cable installation hole (351) and the pulling anchor cable (31).

8. The construction process of a combined anchor cable suitable for tunnel lining according to claim 7, characterized in that: The following steps are involved: S1: Anchor cable installation: a plurality of anchor cable connection holes (5) are opened on the inner wall of the tunnel pilot hole (1), and mortar anchoring agent (6) is poured into the holes, and the pulling anchor cables (31) are screwed into the anchor cable connection holes (5); S2: Anchor cable support and pulling: The support tube (33) is sleeved on the rod section of the pulling anchor cable (31) located in the tunnel guide hole (1), and the first abutment plate (32) is abutted against the inner wall of the tunnel guide hole (1), two connecting rods are connected to two adjacent support tubes (33), and the adjustment sleeve rod (47) is screwed to adjust the overall length of the pulling assembly (4); S3: surrounding rock pouring: pouring a reinforced surrounding rock layer (2) on the inner wall of the tunnel pilot hole (1), wherein the thickness of the reinforced surrounding rock layer (2) is consistent with the length of the support pipe (33); S4: Waterproofing: Lay the supporting mesh layer (9) on the inner wall of the reinforced surrounding rock layer (2), sleeve the second abutment rod on the pulling anchor cable (31), apply a certain amount of prestress to the pulling anchor cable (31), and connect the fastening bolt (38) to the rod section of the pulling anchor cable (31) located outside the supporting tube (33), so that the fastening bolt (38) and the second abutment plate (37) are tightly abutted, and the waterproof layer (10) is connected to the inner wall of the supporting mesh layer (9).

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