A construction method for advanced support of soft rock tunnel

Abstract

The invention belongs to the technical field of tunnel excavation, and specifically relates to a construction method for advance support of soft rock tunnels, comprising the following steps: step S1: determine the tunnel height; step S2: install an advance support device in the tunnel; step S3: advance the working face forward, and add an advance support device along the axial direction of the tunnel; step S4: determine the stability of the tunnel; if the tunnel does not meet the stability requirements, the advance support device corresponding to the tunnel in the goaf is retained; if the tunnel meets the stability requirements, a tunnel stability zone is formed, and when the tunnel stability zone is formed with a range of at least 200m, step S5 is performed; step S5: remove the advance support device placed in the tunnel stability zone; step S6, repeat steps S1 to S5 until all goaf operations are completed. This method can ensure that the deformation of the surrounding rock of the tunnel is controllable during the mining process, and ensure the stability of the surrounding rock of the tunnel. At the same time, the advance support device can ensure that the deformation of the surrounding rock of the tunnel after the working face is mined is controllable.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel excavation, and in particular relates to a construction method for advanced support of soft rock tunnels. Background Art

[0002] The "110 Method" is a new type of coal mining technology used in the coal mining industry. The main purpose of this technology is to increase the recovery rate of coal resources, reduce mining costs and reduce the impact on the environment. The name of the "110 method" comes from its main features: one working face, one roadway, and zero coal pillars (i.e., no coal pillars are left). As coal mining develops deeper and deeper, the large deformation and damage of surrounding rocks and strong impact dynamic disasters caused by deep mining are becoming increasingly severe. Under the complex geomechanical environment of deep high ground stress, high ground temperature, high osmotic pressure, strong mining and multi-field coupling, the stress characteristics of deep mining sites, the nature of coal and rock mass damage, the movement of rock layers, and the law of energy accumulation and release have all undergone significant changes, causing significant damage to the surrounding rocks of the roadway. The roadway has been repeatedly repaired during its later use, resulting in a large amount of manpower, financial and material losses. Since the "110 method" requires advance cutting of the roadway, in order to ensure that the "110 method" can be used in deep roadways, the roadway needs to be advanced supported before the working face is mined to ensure the stability of the roadway. Previous advance support measures often use single hydraulic props for support, which require a large number of single props and are difficult to maintain.

[0003] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Summary of the invention

[0004] In order to solve the above problems, this application relates to a construction method for advance support of soft rock tunnels, and in particular to a support device for advance support of gob-side lane retention in deep high-ground stress soft rock tunnels, and clarifies its construction method. It can ensure that the deformation of the surrounding rock of the tunnel is controllable during the mining process, and ensure the stability of the surrounding rock of the tunnel. At the same time, the device can be used as a temporary support, and can ensure that the deformation of the surrounding rock of the tunnel is controllable after the working face is mined.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A construction method for advanced support of soft rock tunnels, wherein a permanent support device is arranged in the surrounding rock of the tunnel; the improvement thereof is that the construction method comprises the following steps:

[0007] Step S1: Determine the tunnel height;

[0008] Step S2: installing an advance support device in the tunnel; the advance support device is correspondingly arranged on both sides of the tunnel;

[0009] The advance support device includes:

[0010] The base 9 includes a plate-shaped body and is disposed on the bottom plate of the tunnel; the longitudinal axis of the base 9 is parallel to the axis of the tunnel;

[0011] Columns 2, including hydraulic supports, two columns 2 are vertically arranged on a base 9 with respect to the ground;

[0012] The middle supporting structure has the same height as the column 2; the middle supporting structure is arranged between the two columns 2;

[0013] The top plate 7 includes a plate-like body and is connected to the top of the two columns 2 and the middle support structure; the top plate 7 is in contact with the top plate of the tunnel;

[0014] The baffle 1, including a steel plate, is arranged parallel to the ground, and the setting height of the baffle 1 is flush with the top plate 7; the baffle 1 includes three baffles 1, which are respectively connected to the column 2 and the middle supporting structure, and are used to support the top plate of the tunnel.

[0015] Step S3: advancing the working face 15 forward and adding an advance support device along the axial direction of the tunnel; the additional range is at least within 50m in front of the working face 15;

[0016] Step S4: after the working face 15 is mined, a goaf 17 is formed; the roadway stability is determined according to the mine pressure monitoring data; if the roadway does not meet the stability requirements, the advance support device within the range of 250m to 350m corresponding to the goaf 17 is retained; if the roadway meets the stability requirements, a roadway stability zone 19 is formed, and when the roadway stability zone 19 is formed with a range of at least 200m, step S5 is performed;

[0017] Step S5: removing the advance support device placed in the stable area 19 of the tunnel;

[0018] Step S6, repeating steps S1 to S5 until all the mining operations are completed.

[0019] Preferably, the base 9 further includes pulleys 10 , which are correspondingly arranged on both sides of the base 9 and are added along the length direction of the base 9 .

[0020] Preferably, the advance support device further comprises: a pulley protection cover 14; the pulley protection cover is a right-angle steel, comprising a first surface of the pulley protection cover and a second surface of the pulley protection cover which are perpendicular to each other; the first surface of the pulley protection cover is flush with the base 9 and is arranged above the pulley 10;

[0021] The second surface of the pulley protection cover is perpendicular to the first surface of the pulley protection cover and is arranged on the side of the pulley 10 .

[0022] Preferably, the advance support device also includes: a hanging ear 8, which is arranged on the side of the top plate 7; a hanging ear 8 is arranged corresponding to the position of each column 2 and the middle support structure; the hanging ear 8 includes a sheet body with a through hole arranged in the center, and the baffle 1 is connected to the column 2 through the hanging ear 8; and the baffle 1 is connected to the middle support structure through the hanging ear 8.

[0023] Preferably, the advance support device also includes: a first hydraulic lifting rod 5, including a hydraulic rod; each column 2 is connected to a first hydraulic lifting rod 5; the first end of the first hydraulic lifting rod 5 is connected to the column 2; the second end of the first hydraulic lifting rod 5 is connected to the bottom surface of the baffle 1.

[0024] Preferably, the advance support device further includes: a support 13 including two steel plates vertically connected to each other as a whole; the cross section of the support 13 forms a right angle; and the first end of the first hydraulic lifting rod 5 is fixedly connected to the column 2 through the support 13 .

[0025] Preferably, the middle support structure comprises:

[0026] Middle columns 3, two parallel middle columns 3 are vertically arranged on the base 9;

[0027] A middle base 12 connected to the tops of the two middle columns 3;

[0028] The middle hydraulic prop 4 is arranged in the middle of the middle base 12 ; the top of the middle hydraulic prop 4 is connected to the top plate 7 .

[0029] Preferably, the middle supporting structure includes: a second hydraulic lifting rod 6 including a hydraulic rod; a first end of the second hydraulic lifting rod 6 is connected to the middle base 12; and a second end of the second hydraulic lifting rod 6 is connected to the bottom surface of the baffle 1.

[0030] Preferably, the middle supporting structure comprises: a bracket, which is arranged in the middle of the middle base 12; the bracket comprises an "L"-shaped steel; and the first end of the second hydraulic lifting rod 6 is arranged in the "L"-shaped steel.

[0031] Preferably, the advance support device further includes: a track, which is arranged below the base 9 and coaxially arranged with the base 9; a base slot 11 is arranged on the lower surface of the base 9 along the longitudinal axis; and the base 9 is connected to the track through the base slot 11.

[0032] Beneficial effects:

[0033] 1. The use of the advanced support device involved in this application in the tunnel can reduce the workload of hydraulic support and maintenance of the anti-transportation monomer, greatly reducing the work intensity of the workers;

[0034] 2. By supporting the tunnel roof with a baffle plate set on the top of the advance support device, the damage to the tunnel roof caused by the stress concentration on the top of the single hydraulic support can be reduced;

[0035] 3. The advance support device involved in this application can be recycled and used continuously, reducing the workload.

[0036] 4. The present invention is simple in supporting device for deep soft rock tunnels, and the construction method is clear. The combined supporting structure has high pressure-relieving capacity and anti-deformation effect. At the same time, the construction process is simple, which can effectively improve the supporting effect of retaining tunnels, control the deformation of surrounding rocks, and achieve the purpose of protecting tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0038] Figure 1 It is a schematic diagram of a construction method for advanced support of soft rock tunnels according to the present invention;

[0039] Figure 2 This is one of the schematic diagrams for advance support of soft rock tunnels involved in the present invention;

[0040] Figure 3 This is the second schematic diagram of the advance support for soft rock tunnels involved in the present invention;

[0041] Figure 4 It is one of the intentions of the advance support device involved in the present invention;

[0042] Figure 5 This is the second intention of the advance support device involved in the present invention;

[0043] Figure 6 This is the third intention of the advanced support device involved in the present invention;

[0044] Among them, 1. baffle; 2. column; 3. middle column; 4. middle hydraulic support; 5. first hydraulic lifting rod; 6. second hydraulic lifting rod; 7. top plate; 8. hanging ear; 9. base; 10. pulley; 11. base slot; 12. middle base; 13. support; 14. pulley protection cover; 15. working face; 16. advanced support area; 17. goaf area; 18. temporary support area; 19. tunnel stability area. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0046] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0047] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0048] like Figures 1 to 3 As shown, the present application relates to a construction method for advance support of soft rock tunnels, in which a permanent support device is arranged in the surrounding rock of the tunnel; the improvement thereof is that the construction method comprises the following steps:

[0049] Step S1: Determine the tunnel height. Specifically, first determine the tunnel height, and before mining at the working face 15, transport the advance support device into the tunnel, and adjust the size of the advance support device according to the tunnel height.

[0050] Step S2: installing an advance support device in the tunnel; the advance support device is correspondingly arranged on both sides of the tunnel.

[0051] Step S3: Advance the working face 15 forward and add an advance support device along the axial direction of the tunnel; the additional range is at least within 50m in front of the working face 15. Specifically, as the working face 15 advances forward, an advance support device is added at least within 50m in front of the working face 15 to form an advance support area 16.

[0052] Step S4: After the working face 15 is mined, a goaf 17 is formed; the stability of the tunnel is determined according to the mine pressure monitoring data; if the tunnel does not meet the stability requirements, the advance support device within the range of 130m to 150m corresponding to the goaf 17 is retained as a temporary support area 18; if the tunnel meets the stability requirements, a tunnel stability area 19 is formed. When the tunnel stability area 19 forms at least a range of 200m, step S5 is performed. Among them, the mine pressure monitoring data refers to the mine pressure monitoring data, which ensures the safe production of the mine and the safety of personnel through real-time monitoring and analysis of the changes in mine pressure. The mine pressure monitoring data can be obtained through various monitoring equipment and sensors. The monitoring equipment and sensors can measure the size, direction and change trend of the mine pressure, and then determine the stability of the tunnel. By collecting and analyzing these data, the distribution law, change trend and possible risks and hidden dangers of the mine pressure can be understood. The mine pressure monitoring data can be obtained by using the commonly used technical means in the prior art.

[0053] Step S5: removing the advance support device placed in the stable area 19 of the tunnel;

[0054] Step S6, repeating steps S1 to S5 until all the mining operations are completed.

[0055] Among them, the permanent support device (not shown in the figure) used in the tunnel surrounding rock can adopt common constant resistance anchor cables and anchor rods for support.

[0056] like Figure 4 As shown, the advance support device involved in this application includes:

[0057] The base 9 includes a plate-like body, which is arranged on the bottom plate of the tunnel; the longitudinal axis of the base 9 is parallel to the axis of the tunnel. Specifically, the base 9 is a rectangular plate-like body, and its length and width are not limited. It is designed according to actual engineering needs. In this application, carbon steel with a thickness of 50 mm is preferably used as the base 9.

[0058] Preferably, the base 9 further includes pulleys 10, which are correspondingly arranged on both sides of the base 9 and are added along the length direction of the base 9. Specifically, in order to facilitate the movement of the advance support device, rollers are arranged in the width direction of the base 9 and are evenly added along the length direction of the base 9. The pulleys 10 are connected to the base 9 via rollers. The spacing of the pulleys 10 is not limited and is designed according to actual engineering needs.

[0059] Preferably, Figure 5As shown, the support device also includes: a pulley protection cover 14; the pulley protection cover is a right-angle steel, including a first surface of the pulley protection cover and a second surface of the pulley protection cover that are perpendicular to each other; the first surface of the pulley protection cover is flush with the base 9 and is arranged above the pulley 10; the second surface of the pulley protection cover is perpendicular to the first surface of the pulley protection cover and is arranged on the side of the pulley 10. Specifically, the pulley protection cover 14 is a right-angle steel, and the length of the pulley protection cover 14 matches the length of the base 9. The pulley protection cover 14 includes a first surface and a second surface that are perpendicularly connected to each other at the edge. The width of the first surface of the pulley protection cover 14 matches the thickness of the pulley 10, and can completely cover the pulley 10; the width of the second surface of the pulley protection cover 14 matches the height of the pulley 10, and can completely block the pulley 10. The first surface of the pulley protection cover is flush with the base 9. The connection method is not limited. The pulley protection cover 14 can be welded to the side of the base 9; or a protrusion can be set at the connection between the pulley protection cover 14 and the base 9, and a groove corresponding to the protrusion can be set on the side of the base 9. The pulley protection cover 14 and the base 9 are connected by the protrusion and the groove.

[0060] The advance support device also includes: columns 2, including hydraulic props, and two columns 2 are vertically arranged on the base 9 with the ground. Specifically, the shape of the columns 2 is not limited, and can be cylindrical hydraulic props. In order to facilitate the subsequent setting of the support 13 on the columns 2, this application chooses to adopt Figure 4 and Figure 5 The rectangular hydraulic prop shown in FIG. Two upright posts 2 are arranged at both ends of a base 9 .

[0061] The middle supporting structure has the same height as the columns 2 ; the middle supporting structure is arranged between the two columns 2 .

[0062] Among them, Figure 4 and Figure 5 As shown, the middle support structure includes a middle column 3, and two parallel middle columns 3 are vertically arranged on a base 9. Specifically, the middle column 3 includes a columnar body, and the shape and material are not limited, and it can be a cylindrical or polygonal column. The height of the middle column 3 is not limited, and it shall be subject to the actual engineering needs.

[0063] The middle base 12 is connected to the top of the two middle columns 3. Specifically, the middle base 12 is a strip-shaped plate, and is connected to the top of the two middle columns 3 at the same time. The length of the middle base 12 is not limited, and the length can be enough to connect the tops of the two middle columns 3. The width of the middle base 12 matches the diameter of the middle column 3, and the minimum width of the middle base 12 needs to be able to cover the middle column 3; the maximum width of the middle base 12 cannot exceed the width of the base 9.

[0064] The middle support structure also includes: a middle hydraulic support 4, which is arranged in the middle of the middle base 12;

[0065] The top plate 7 includes a plate-like body, which is connected to the top of the two columns 2 and the middle support structure at the same time; the top plate 7 is in contact with the top plate of the tunnel. Specifically, the top plate 7 is a rectangular plate-like body, and its length and width match the size of the base 9. The present application preferably uses 50mm thick carbon steel as the top plate 7. The top plate 7 is arranged on the top of the two columns 2 and the middle support structure: the bottom surface of the top plate 7 is connected to the two columns 2 and the middle column 3 at the same time. The specific connection method is not limited and can be welding. By adjusting the height of the two columns 2 and the middle column 3, the top surface of the top plate 7 is in contact with the top plate of the tunnel. The advance support device involved in the present application also includes: a baffle 1, including a steel plate, which is arranged parallel to the ground, and the setting height of the baffle 1 is flush with the top plate 7; the baffle 1 includes three baffles, which are respectively connected to the columns 2 and the middle support structure, and are used to support the top plate of the tunnel. The advance support device also includes: a hanging ear 8, which is arranged on the side of the top plate 7; a hanging ear 8 is arranged corresponding to the position of each column 2 and the middle support structure; the hanging ear 8 includes a sheet body with a through hole arranged in the center, and the baffle 1 is connected to the column 2 through the hanging ear 8; and the baffle 1 is connected to the middle support structure through the hanging ear 8.

[0066] Specifically, Figures 4 to 6 As shown, in order to strengthen the support of the advance support device for the tunnel roof, the present application also adds a baffle 1. The baffle 1 is a plate-like body, and the baffle 1 is flush with the roof 7. The size of the baffle 1 is not limited and is designed according to actual engineering needs. A baffle 1 is connected to the top of the side of the two columns 2 and the top of the side of the middle hydraulic support 4. A lug 8 is set on the side of the roof 7, and the position of the lug 8 corresponds to the position of the two columns 2 and the middle hydraulic support 4. Among them, the lug 8 is a sheet-like structure with a through hole in the center. In the present application, the lug 8 adopts a 30mm thick steel plate. A hole matching the lug 8 is set at the edge of the baffle 1, and the baffle 1 is connected to the lug 8 through the hole matching. In order to ensure the connection strength between the baffle 1 and the lug 8, the lug 8 can be set in pairs, that is, each baffle 1 is connected to two parallel lugs 8.

[0067] The advance support device also includes: a first hydraulic lifting rod 5, including a hydraulic rod, which can be extended and retracted along the axial direction; each column 2 is connected to a first hydraulic lifting rod 5; the first end of the first hydraulic lifting rod 5 is connected to the column 2; the second end of the first hydraulic lifting rod 5 is connected to the bottom surface of the baffle 1.

[0068] Preferably, the advance support device also includes: a support 13, including two steel plates vertically connected to each other as a whole, and the cross-section forms a right angle; the right-angled surface of the support 13 is fixedly connected to the column 2. The connection method is not limited, and welding is preferred. The first end of the first hydraulic lifting rod 5 is connected to the column 2 through the support 13. Specifically, the first end of the first hydraulic lifting rod 5 is welded to the center of the support 13, and the second end of the first hydraulic lifting rod 5 is welded to the center of the bottom surface of the baffle 1. Through the extension and retraction of the first hydraulic lifting rod 5, the baffle 1 can be rotated along the axis of the hanging ear 8 to achieve the lowering and lifting of the baffle 1.

[0069] The middle support structure also includes: a second hydraulic lifting rod 6, including a hydraulic rod, which can be extended and retracted along the axial direction; the first end of the second hydraulic lifting rod 6 is connected to the middle base 12; the second end of the second hydraulic lifting rod 6 is connected to the baffle 1.

[0070] Preferably, the middle support structure includes: a bracket, which is arranged in the middle of the middle base 12; the bracket includes an "L"-shaped steel; the first end of the second hydraulic lifting rod 6 is arranged in the "L"-shaped steel. Specifically, the right-angle surface of the bracket is fixedly connected to the middle base 12. The connection method is not limited, and welding is preferred. The first end of the second hydraulic lifting rod 6 is connected to the middle support structure through the bracket. Specifically, the first end of the second hydraulic lifting rod 6 is welded to the center of the bracket, and the second end of the second hydraulic lifting rod 6 is welded to the center of the bottom surface of the baffle 1. Through the extension and retraction of the second hydraulic lifting rod 6, the baffle 1 can be rotated along the axis of the hanging ear 8 to achieve the lowering and lifting of the baffle 1. Each baffle 1 is adjusted separately so that the baffle 1 can fit more closely with the top plate of the tunnel, thereby achieving a more effective support effect.

[0071] Preferably, the advance support device further includes: a track, which is arranged below the base 9 and coaxially arranged with the base 9; a base slot 11 is arranged on the lower surface of the base 9 along the longitudinal axis; and the base 9 is connected to the track through the base slot 11.

[0072] Specifically, if the surrounding rock at the bottom of the tunnel is good, the advance support device can be moved by the pulley 10 at the bottom. If the surrounding rock at the bottom of the tunnel is poor, a slide rail is provided at the bottom of the advance support device, that is, a slide rail matching the advance support device is installed on the bottom plate of the tunnel to assist in movement. The advance support device involved in the present application adjusts the lifting of the entire device by simultaneously controlling the column 2 and the middle column 3 to adapt to the height of the entire tunnel. The overall lifting range of the advance support device involved in the present application is 3000-4800mm, which can meet the needs of most tunnels.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A construction method for advanced support of soft rock tunnels, wherein a permanent support device is arranged in the surrounding rock of the tunnel; characterized in that: The construction method comprises the following steps: Step S1: Determine the tunnel height; Step S2: installing an advance support device in the tunnel; the advance support device is correspondingly arranged on both sides of the tunnel; The advanced support device comprises: The base (9) comprises a plate-shaped body and is arranged on the bottom plate of the tunnel; the longitudinal axis of the base (9) is parallel to the axis of the tunnel; A column (2) comprising a hydraulic support, wherein two of the columns (2) are arranged vertically on the base (9) and perpendicular to the ground; A middle support structure, wherein the middle support structure is at the same height as the upright posts (2); the middle support structure is arranged between two upright posts (2); A top plate (7) comprising a plate-shaped body, connected to the two uprights (2) and the top of the middle support structure; the top plate (7) is in contact with the top plate of the tunnel; The baffle (1) comprises a steel plate, which is arranged parallel to the ground, and the height of the baffle (1) is flush with the roof (7); the baffle (1) comprises three baffles (1), which are respectively connected to the column (2) and the middle support structure, and are used to support the roof of the tunnel; Step S3: advancing the working face (15) forward and adding the advanced support device along the axial direction of the tunnel; the adding range is at least within 50 m in front of the working face (15); Step S4: after the working face (15) is mined, a goaf area (17) is formed; the roadway stability is determined based on the mine pressure monitoring data; if the roadway does not meet the stability requirements, the advance support device is retained within the range of 250m to 350m of the roadway corresponding to the goaf area (17); if the roadway meets the stability requirements, a roadway stability area (19) is formed, and when the roadway stability area (19) is formed with a range of at least 200m, step S5 is performed; Step S5: removing the advance support device placed in the tunnel stabilization area (19); Step S6, repeating steps S1 to S5 until all the mining operations are completed; The advanced support device further comprises: a hanging ear (8) arranged on the side of the top plate (7); the hanging ear (8) is arranged correspondingly at the position of each of the upright posts (2) and the middle support structure; the hanging ear (8) comprises a sheet-like body with a through hole arranged at the center, the baffle (1) is connected to the upright post (2) via the hanging ear (8); and the baffle (1) is connected to the middle support structure via the hanging ear (8); The advance support device further comprises: a first hydraulic lifting rod (5), comprising a hydraulic rod; each of the columns (2) is connected to one of the first hydraulic lifting rods (5); a first end of the first hydraulic lifting rod (5) is connected to the column (2); a second end of the first hydraulic lifting rod (5) is connected to the bottom surface of the baffle (1); The middle support structure comprises: Middle columns (3), two parallel middle columns (3) are vertically arranged on the base (9); A middle base (12) connected to the tops of the two middle columns (3); A middle hydraulic support (4) is arranged in the middle of the middle base (12); the top of the middle hydraulic support (4) is connected to the top plate (7).

2. The construction method for advanced support of soft rock tunnel according to claim 1, characterized in that: The base (9) further comprises pulleys (10), wherein the pulleys (10) are correspondingly arranged on two sides of the base (9) and are added along the length direction of the base (9).

3. The construction method for advanced support of soft rock tunnel according to claim 2, characterized in that: The advance support device further comprises: a pulley protection cover (14); the pulley protection cover is a right-angle steel, comprising a first surface of the pulley protection cover and a second surface of the pulley protection cover which are perpendicular to each other; the first surface of the pulley protection cover is flush with the base (9) and is arranged above the pulley (10); The second surface of the pulley protection cover is perpendicular to the first surface of the pulley protection cover and is arranged on the side of the pulley (10).

4. The construction method for advanced support of soft rock tunnel according to claim 1, characterized in that: The advance support device further comprises: a support (13) comprising two steel plates vertically connected to each other as a whole; the cross section of the support (13) forms a right angle; and the first end of the first hydraulic lifting rod (5) is fixedly connected to the column (2) via the support (13).

5. The construction method for advanced support of soft rock tunnel according to claim 1, characterized in that: The middle support structure comprises: a second hydraulic lifting rod (6), comprising a hydraulic rod; a first end of the second hydraulic lifting rod (6) is connected to the middle base (12); and a second end of the second hydraulic lifting rod (6) is connected to the bottom surface of the baffle (1).

6. The construction method for advanced support of soft rock tunnel according to claim 5, characterized in that: The middle support structure comprises: a bracket, which is arranged in the middle of the middle base (12); the bracket comprises "L"-shaped steel; and the first end of the second hydraulic lifting rod (6) is arranged in the "L"-shaped steel.

7. The construction method for advanced support of soft rock tunnel according to claim 1, characterized in that: The advance support device further comprises: a track, which is arranged below the base (9) and is coaxially arranged with the base (9); a base notch (11) is arranged on the lower surface of the base (9) along the longitudinal axis; and the base (9) is connected to the track via the base notch (11).

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