An initial support device for a soft surrounding rock and unsymmetrical pressure multi-arch tunnel

Abstract

The present invention provides an initial support device for a weak surrounding rock biased arch tunnel. The initial support device for a weak surrounding rock biased arch tunnel comprises a support mechanism; a water pump; an anchor rod; a filter mechanism, wherein the filter mechanism comprises a mounting pipe, a drainage pipe, a connecting plate, a protrusion, a filter screen, a pointed head and a fixed rod. The mounting pipe is installed inside the anchor rod, and the inside of the mounting pipe is slidably connected to the drainage pipe; the top end of the drainage pipe is rotatably connected to the connecting plate, and the side walls of the connecting plate are equidistantly installed with the protrusions having arc-shaped side walls; the inside of the connecting plate is rotatably connected to the filter screen, and the filter screen is fixedly connected to the drainage pipe; the fixing rod is installed on the side walls of the drainage pipe, and the inside of the pointed head is rotatably connected to the fixing rod and the filter screen; a connecting mechanism; and a rock layer. The initial support device for a weak surrounding rock biased arch tunnel provided by the present invention has the advantages of effectively draining water accumulated inside the rock layer and increasing the strength of the rock layer.

Description

Technical Field

[0001] The invention relates to the technical field of pile hole construction, in particular to an initial support device for a soft surrounding rock biased multi-arch tunnel. Background Art

[0002] The rock mass in the fractured zone of a soft surrounding rock tunnel is loose and may contain mud or fissure water. The construction process of a double-arch tunnel is complex, technically difficult, and the construction period is relatively long. At the same time, the two tunnels of a double-arch tunnel will affect each other during construction, which is reflected in the tunnel stress as eccentric pressure and horizontal thrust acting on the middle partition wall.

[0003] After the tunnel is excavated, it needs to be initially supported. Mortar is sprayed on the side walls of the tunnel. However, water in the rock strata flows through the cracks in the rock strata, washing away the mortar and the rock strata, causing the rock around the tunnel to become loose, which can easily lead to accidents such as water gushing in the tunnel and falling blocks.

[0004] Therefore, it is necessary to provide a new initial support device for weak surrounding rock biased double-arch tunnels to solve the above technical problems. Summary of the Invention

[0005] The technical problem solved by the present invention is to provide an initial support device for a soft surrounding rock biased multi-arch tunnel, which can effectively drain water accumulated inside the rock layer and increase the strength of the rock layer.

[0006] To solve the above technical problems, the present invention provides an initial support device for a weak surrounding rock biased arch tunnel, comprising: a support mechanism; a water pump, the water pump being connected to the bottom end of the support mechanism; an anchor rod, the anchor rod being against the side wall of the support mechanism; a filter mechanism, the filter mechanism being installed inside the anchor rod, the filter mechanism comprising a mounting pipe, a drainage pipe, a connecting plate, a protrusion, a filter screen, a pointed head and a fixing rod, the mounting pipe being installed inside the anchor rod, the interior of the mounting pipe being slidably connected to the drainage pipe; the top end of the drainage pipe being rotatably connected to the connecting plate, the side walls of the connecting plate being equidistantly installed with the protrusions having arc-shaped side walls; the interior of the connecting plate being rotatably connected to the filter screen, the filter screen being fixedly connected to the drainage pipe; the fixing rod being installed on the side wall of the drainage pipe, the interior of the pointed head being rotatably connected to the fixing rod and the filter screen; a connecting mechanism, the bottom end of the connecting mechanism being rotatably connected to the drainage pipe, and the connecting mechanism being connected to the support mechanism; a rock layer, the supporting mechanism being installed on the side wall of the rock layer, and the anchor rod extending into the interior of the rock layer.

[0007] Preferably, the support mechanism includes a steel frame, a mortar layer and a wire mesh, the wire mesh is laid on the side wall of the rock layer, the mortar layer is sprayed on the side wall of the wire mesh, and the hollow steel frame is installed on the side wall of the mortar layer, and the water pump is installed at the bottom end of the steel frame.

[0008] Preferably, the anchor rod includes a slurry stop plug, a support rod, a baffle, a joint, a fixed block and a groove, the side wall of the slurry stop plug contacts the mortar layer and the wire mesh, the interior of the slurry stop plug is fixedly connected to the support rod, and a plurality of baffles are installed on the side wall of the support rod; the joint is installed inside the slurry stop plug, and the joint is connected to the bottom end of the support rod; the spherical fixed block is installed at the top end of the support rod, and the groove is symmetrically provided at the top end of the support rod.

[0009] Preferably, the support rods extend into the interior of the rock layer, and the baffles with arc-shaped side walls are staggeredly installed on the side walls of the support rods, and the bending directions of adjacent baffles are different.

[0010] Preferably, the mounting tube is installed inside the support rod, the top end of the mounting tube is fixedly connected to the fixing block, and the tip, the filter screen and the connecting plate are installed inside the fixing block.

[0011] Preferably, the connecting mechanism includes a connecting block, a fixing sleeve, a connecting rod, a fan blade and a hose, and the two ends of the hose are connected to the steel frame and the fixing sleeve; the connecting block is installed at the bottom end of the fixing sleeve, the interior of the fixing sleeve is rotated to connect to the drain pipe, the bottom end of the hollow drain pipe is fixedly connected to the connecting rod, and the fan blade is installed at the bottom end of the hollow drain pipe, and the fan blade is aligned with one end of the hose.

[0012] Preferably, the maximum diameter of the conical tip is equal to the maximum diameter of the connecting plate, the diameter of the filter is smaller than the maximum diameter of the tip, and the longest vertical distance between the two protrusions is greater than the maximum diameter of the tip.

[0013] Compared with related technologies, the initial support device for a soft surrounding rock biased double-arch tunnel provided by the present invention has the following beneficial effects:

[0014] The present invention provides an initial support device for a weak surrounding rock biased arch tunnel, wherein after the tunnel is excavated, the anchor rod is driven into the tunnel, and the support mechanism is installed on the tunnel side wall, and when mortar is injected into the anchor rod, the mortar penetrates the anchor rod into the rock layer, fixing the anchor rod in the rock layer; the connecting mechanism is struck, so that the connecting mechanism drives the drainage pipe to move upward inside the installation pipe, and at the same time, the drainage pipe drives the pointed head, the filter screen and the connecting plate to move upward into the rock layer, and the connecting plate drives the elastic protrusion to enter the rock layer, and the bending direction of the protrusion is opposite to the moving direction of the protrusion, and the rock layer squeezes the elastic protrusion to contract, so that the protrusion can enter the rock layer conveniently, and when the connecting mechanism stops moving, the protrusion opens and engages the rock layer, and the pointed head is The head and the filter screen are fixed inside the rock layer, and the water pump is turned on. The water pump generates suction inside the connecting mechanism, driving the drainage pipe and the filter screen to rotate, so that the filter screen rotates in the rock layer, and the diameter of the filter screen is smaller than the maximum diameter of the pointed head and the connecting plate. The filter screen is located between the pointed head and the connecting plate, reducing the probability of the filter screen contacting the rock, facilitating the rotation of the filter screen in the rock layer, and the accumulated water in the rock layer enters the interior of the support mechanism through the filter screen, the drainage pipe, and the connecting mechanism, effectively draining the accumulated water in the rock layer, preventing the rock layer from washing the mortar in the rock layer, facilitating the drying of the mortar in the rock layer, and quickly draining the accumulated water in the rock layer, increasing the stability and firmness of the rock layer, and reducing the probability of accidents such as water gushing and block falling in the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of the initial support device for a biased double-arch tunnel with weak surrounding rock provided by the present invention;

[0016] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at point A is shown;

[0017] Figure 3 for Figure 2 Schematic diagram of the internal structure of the support rod shown;

[0018] Figure 4 for Figure 2 An enlarged schematic diagram of the structure at point B is shown;

[0019] Figure 5 for Figure 3 Schematic diagram of the internal structure of the fixed sleeve shown;

[0020] Figure 6 for Figure 4Schematic diagram of the internal structure of the connecting plate shown.

[0021] Numbers in the figure: 1. Support mechanism, 11. Steel frame, 12. Mortar layer, 13. Wire mesh, 2. Water pump, 3. Anchor rod, 31. Slurry stopper, 32. Support rod, 33. Baffle, 34. Joint, 35. Fixing block, 36. Groove, 4. Rock layer, 5. Connecting mechanism, 51. Connecting block, 52. Fixing sleeve, 53. Connecting rod, 54. Fan blade, 55. Hose, 6. Filter mechanism, 61. Mounting pipe, 62. Drain pipe, 63. Connecting plate, 64. Bump, 65. Filter net, 66. Pointed head, 67. Fixing rod. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 ,in Figure 1 A schematic structural diagram of the initial support device for a biased double-arch tunnel with weak surrounding rock provided by the present invention; Figure 2 for Figure 1 An enlarged schematic diagram of the structure at point A is shown; Figure 3 for Figure 2 Schematic diagram of the internal structure of the support rod shown; Figure 4 for Figure 2 An enlarged schematic diagram of the structure at point B is shown; Figure 5 for Figure 3 Schematic diagram of the internal structure of the fixed sleeve shown; Figure 6 for Figure 4The schematic diagram of the internal structure of the connecting plate is shown. The initial support device of the weak surrounding rock biased arch tunnel includes: a support mechanism 1; a water pump 2, the water pump 2 is connected to the bottom end of the support mechanism 1; an anchor rod 3, the anchor rod 3 is against the side wall of the support mechanism 1; a filter mechanism 6, the filter mechanism 6 is installed inside the anchor rod 3, the filter mechanism 6 includes a mounting pipe 61, a drainage pipe 62, a connecting plate 63, a protrusion 64, a filter screen 65, a pointed head 66 and a fixing rod 67, the mounting pipe 61 is installed inside the anchor rod 3, and the interior of the mounting pipe 61 is slidably connected to the drainage pipe 62; the top end of the drainage pipe 62 is rotatably connected to the connecting plate 6 3. The side walls of the connecting plate 63 are equidistantly installed with the arc-shaped protrusions 64; the interior of the connecting plate 63 is rotatably connected to the filter screen 65, and the filter screen 65 is fixedly connected to the drain pipe 62; the side wall of the drain pipe 62 is installed with the fixing rod 67, and the interior of the pointed head 66 is rotatably connected to the fixing rod 67 and the filter screen 65; the connecting mechanism 5, the bottom end of the connecting mechanism 5 is rotatably connected to the drain pipe 62, and the connecting mechanism 5 is connected to the supporting mechanism 1; the rock layer 4, the side wall of the rock layer 4 is installed with the supporting mechanism 1, and the anchor rod 3 extends into the interior of the rock layer 4.

[0024] The support mechanism 1 includes a steel frame 11, a mortar layer 12 and a wire mesh 13. The wire mesh 13 is laid on the side wall of the rock layer 4, and the mortar layer 12 is sprayed on the side wall of the wire mesh 13. The hollow steel frame 11 is installed on the side wall of the mortar layer 12, and the water pump 2 is installed at the bottom end of the steel frame 11. For convenience, the wire cylinder 13 covers the inside of the tunnel to prevent falling rocks, and the mortar layer 12 is sprayed on the wire mesh 13 and the side wall of the tunnel to fix the wire mesh 13 on the side wall of the tunnel. The steel frame 11 provides support for the inside of the tunnel to prevent tunnel collapse.

[0025] The anchor rod 3 includes a slurry stopper 31, a support rod 32, a baffle 33, a joint 34, a fixing block 35 and a groove 36. The side wall of the slurry stopper 31 contacts the mortar layer 12 and the wire mesh 13. The interior of the slurry stopper 31 is fixedly connected to the support rod 32. A plurality of baffles 33 are installed on the side wall of the support rod 32. The interior of the slurry stopper 31 is installed with the joint 34, and the joint 34 is connected to the bottom end of the support rod 32. The top end of the support rod 32 is installed with the spherical fixing block 35, and the top end of the support rod 32 is symmetrically provided with the groove 36. In order to facilitate the drilling of holes in the tunnel by the drilling rig, the support rod 32 and the slurry stopper are connected. The plug 31 is placed in the hole, and the mortar is injected into the interior of the joint 34, so that the mortar passes through the joint 34 and the support rod 32 and is discharged from the groove 36 into the hole, and the mortar stop plug 31 closes the hole to prevent the mortar from flowing out of the hole, thereby fixing the support rod 32 to the inside of the rock layer 4, increasing the strength of the rock layer 4, and the side walls of the support rod 32 are staggeredly installed with the baffles 33 with arc-shaped side walls, and the bending directions of adjacent baffles 33 are different, and the staggered baffles 33 are in contact with the mortar, increasing the contact area with the mortar, and ensuring the stability and firmness of the support rod 32 in the mortar and the rock layer 4.

[0026] The mounting tube 61 is installed inside the support rod 32. In order for the mounting tube 61 to separate the drainage pipe 62 from the mortar and facilitate the movement of the drainage pipe 62 inside the mounting tube 61, the top end of the mounting tube 61 is fixedly connected to the fixing block 35. The pointed head 66, the filter screen 65 and the connecting plate 63 are installed inside the fixing block 35. When the mortar is injected into the hole through the joint 34 and the support rod 32, the fixing block 35 contacts the rock layer 4. The fixing block 35 prevents the pointed head 66, the filter screen 65 and the connecting plate 63 from contacting the mortar, making it convenient for the pointed head 66 to drive the filter screen 65 and the connecting plate 63 into the interior of the rock layer 4.

[0027] The connecting mechanism 5 includes a connecting block 51, a fixing sleeve 52, a connecting rod 53, a fan blade 54 and a hose 55. The two ends of the hose 55 are connected to the steel frame 11 and the fixing sleeve 52; the bottom end of the fixing sleeve 52 is installed with the connecting block 51, the interior of the fixing sleeve 52 is rotatably connected to the drain pipe 62, the bottom end of the hollow drain pipe 62 is fixedly connected to the connecting rod 53, the bottom end of the hollow drain pipe 62 is installed with the fan blade 54, and the fan blade 54 is aligned with one end of the hose 55. In order to turn on the water pump 2, the water pump 2 is operated to generate suction inside the hose 55, and the hose 55 sucks the fixing sleeve 52, The water and air inside the connecting rod 53 and the drain pipe 62 move inside the fan blade 54, thereby driving the fan blade 54 and the connecting rod 53 to rotate inside the fixed sleeve 52. The connecting rod 53 drives the drain pipe 62 and the filter screen 65 to rotate. The filter screen 65 continuously rotates inside the rock layer 4, reducing the probability of clogging of the filter screen 65, making it convenient for the accumulated water in the rock layer 4 to pass through the filter screen 65, the drain pipe 62, the connecting rod 53 and the hose 55 to enter the interior of the steel frame 11, making it convenient for workers to discharge the accumulated water inside the rock layer 4 and prevent excessive water from accumulating inside the rock layer 4.

[0028] The maximum diameter of the conical tip 66 is equal to the maximum diameter of the connecting plate 63, and the diameter of the filter screen 65 is smaller than the maximum diameter of the tip 66, in order to facilitate the fixing of the filter screen 65 between the connecting plate 63 and the tip 66, thereby reducing the probability of the filter screen 65 contacting the rock; and the longest vertical distance between the two protrusions 64 is greater than the maximum diameter of the tip 66, in order to facilitate the protrusions 64 to open and squeeze the interior of the rock layer 4, thereby fixing the filter screen 65 inside the rock layer 4.

[0029] The working principle of the initial support device for the weak surrounding rock biased arch tunnel provided by the present invention is as follows: after the tunnel is excavated, a hole is drilled inside the tunnel using a drilling rig, the support rod 32 and the grouting plug 31 are placed in the hole, and mortar is injected into the interior of the joint 34, so that the mortar passes through the joint 34 and the support rod 32 and is discharged from the groove 36 into the hole, and the grouting plug 31 closes the hole to prevent the mortar from flowing out of the hole, thereby fixing the support rod 32 to the inside of the rock layer 4, increasing the strength of the rock layer 4, and the The side walls of the support rods 32 are staggeredly installed with the baffles 33 having arc-shaped side walls, and the bending directions of adjacent baffles 33 are different, and the staggered baffles 33 are in contact with the mortar, increasing the contact area with the mortar, and ensuring the stability and firmness of the support rods 32 in the mortar and the rock layer 4. The wire cylinder 13 is used to cover the interior of the tunnel to prevent rockfall, and the mortar layer 12 is sprayed on the wire mesh 13 and the side walls of the tunnel, and the wire mesh 13 is fixed to the side walls of the tunnel, and the steel frame 11 provides support for the interior of the tunnel to prevent tunnel collapse. Hit the connecting block 51 so that the connecting block 51 drives the drain pipe 62 to move upward inside the mounting pipe 61. At the same time, the drain pipe 62 drives the pointed head 66, the filter screen 65 and the connecting plate 63 to move upward into the interior of the rock layer 4. The connecting plate 63 drives the elastic protrusion 64 into the rock layer 4. The bending direction of the protrusion 64 is opposite to the movement direction of the protrusion 64. The rock layer 4 squeezes the protrusion 64 with the extrusion elasticity to contract, making it easier for the protrusion 65 to enter the rock layer. When the connecting block 51 stops moving, the protrusion 64 opens and engages the interior of the rock layer 4, fixing the pointed head 66 and the filter screen 65 inside the rock layer 4. The hose 55 is used to connect the fixing sleeve 52 to the steel frame 11.Connect the water pump 2 to an external power source, connect the water pump 2 to the bottom end of the steel frame 11, turn on the water pump 2, and the operation of the water pump 2 generates suction inside the hose 55. The hose 55 sucks water and air inside the fixed sleeve 52, the connecting rod 53 and the drain pipe 62 to move inside the fan blade 54, thereby driving the fan blade 54 and the connecting rod 53 to rotate inside the fixed sleeve 52. The connecting rod 53 drives the drain pipe 62 and the filter screen 65 to rotate, and the diameter of the filter screen 65 is smaller than that of the tip 66 and the connecting plate 63. The maximum diameter, the filter screen 65 is located between the pointed head 66 and the connecting plate 63, reducing the probability of the filter screen 65 contacting the rock, facilitating the rotation of the filter screen 65 in the rock layer 4, and the accumulated water in the rock layer 4 enters the interior of the steel frame 11 through the filter screen 65, the drain pipe 62, the connecting rod 53, the fixing sleeve 52 and the hose 55, effectively draining the accumulated water in the rock layer 4, preventing the rock layer 4 from washing the mortar in the rock layer 4, and facilitating the drying of the mortar in the rock layer 4 to fix the anchor rod 3 in the rock layer 4. When excavating the interior of the tunnel, the accumulated water in the rock layer 4 is discharged through the drain pipe 62, preventing excessive water accumulation in the rock layer 4. When it is no longer necessary to drain the accumulated water inside the rock layer 4 in the later stage of the tunnel, the mortar is quickly passed into the interior of the fixing sleeve 52, so that the mortar passes through the connecting rod 53, the drainage pipe 62 and the filter screen 65 and enters the gaps in the rock layer 4 and the solidified mortar around the anchor rod 3, so that the mortar repairs the gaps, thereby further increasing the stability of the rock layer 4 and preventing the tunnel from collapsing.

[0030] Compared with related technologies, the initial support device for a soft surrounding rock biased double-arch tunnel provided by the present invention has the following beneficial effects:

[0031] The present invention provides an initial support device for a weak surrounding rock biased arch tunnel. After the tunnel is excavated, the anchor rod 3 is driven into the tunnel, and the supporting mechanism 1 is installed on the tunnel side wall. When the mortar is injected into the anchor rod 3, the mortar penetrates the anchor rod 3 and enters the rock layer 4, fixing the anchor rod 3 in the rock layer 4. The connecting mechanism 5 is struck, so that the connecting mechanism 5 drives the drainage pipe 62 to move upward inside the installation pipe 61. At the same time, the drainage pipe 62 drives the pointed head, the filter screen 65 and the connecting plate 63 to move upward into the rock layer 4, and the connecting plate 63 drives the elastic protrusion 64 to enter the rock layer 4. The bending direction of the protrusion 64 is opposite to the moving direction of the protrusion 64. The rock layer 4 squeezes the protrusion 64 with the extrusion elasticity to contract, making it convenient for the protrusion 64 to enter the rock layer 4. When the connecting mechanism 5 stops moving, the protrusion 64 opens and engages the rock layer 4, and the pointed head 6 6 and the filter screen 65 are fixed inside the rock layer 4, and the water pump 2 is turned on. The water pump 2 generates suction inside the connecting mechanism 5, driving the drainage pipe 62 and the filter screen 65 to rotate, so that the filter screen 65 rotates in the rock layer 4, and the diameter of the filter screen 65 is smaller than the maximum diameter of the pointed head 66 and the connecting plate 63. The filter screen 65 is located between the pointed head 66 and the connecting plate 63, reducing the probability of the filter screen 65 contacting the rock, facilitating the rotation of the filter screen 65 in the rock layer 4, and the accumulated water in the rock layer 4 enters the interior of the supporting mechanism 1 through the filter screen 65, the drainage pipe 62, and the connecting mechanism 5, effectively draining the accumulated water in the rock layer 4, preventing the rock layer 4 from washing the mortar in the rock layer 4, facilitating the drying of the mortar in the rock layer 4, and quickly draining the accumulated water in the rock layer 4, thereby increasing the stability and firmness of the rock layer 4 and reducing the probability of accidents such as water gushing and block falling in the tunnel.

[0032] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An initial support device for a soft surrounding rock biased double-arch tunnel, characterized by: include: Support mechanism (1); the support mechanism (1) comprises a steel frame (11), a mortar layer (12) and a steel mesh (13); the steel mesh (13) is laid on the side wall of the rock layer (4); the mortar layer (12) is sprayed on the side wall of the steel mesh (13); the hollow steel frame (11) is installed on the side wall of the mortar layer (12); and a water pump (2) is installed at the bottom end of the steel frame (11); A water pump (2), the water pump (2) being connected to the bottom end of the supporting mechanism (1); An anchor rod (3), the anchor rod (3) contacts the side wall of the support mechanism (1); the anchor rod (3) comprises a stopper plug (31), a support rod (32), a baffle (33), a joint (34), a fixing block (35) and a groove (36); the side wall of the stopper plug (31) contacts the mortar layer (12) and the wire mesh (13); the interior of the stopper plug (31) is fixedly connected to the support rod (32); a plurality of baffles (33) are installed on the side wall of the support rod (32); the joint (34) is installed inside the stopper plug (31), and the joint (34) is connected to the bottom end of the support rod (32); the top end of the support rod (32) is installed with the spherical fixing block (35), and the top end of the support rod (32) is symmetrically provided with the groove (36); A filter mechanism (6), the filter mechanism (6) is installed inside the anchor rod (3), the filter mechanism (6) comprises a mounting tube (61), a drain pipe (62), a connecting plate (63), a protrusion (64), a filter screen (65), a pointed head (66) and a fixing rod (67), the mounting tube (61) is installed inside the anchor rod (3), and the inside of the mounting tube (61) is slidably connected to the drain pipe (62); the top end of the drain pipe (62) is rotatably connected to the connecting plate (63), and the side wall of the connecting plate (63) is equidistantly installed with the protrusion (64) having an arc-shaped side wall; the inside of the connecting plate (63) is rotatably connected to the filter screen (65), and the filter screen (65) is fixedly connected to the drain pipe (62); the fixing rod (67) is installed on the side wall of the drain pipe (62), and the inside of the pointed head (66) is rotatably connected to the fixing rod (67) and the filter screen (65); A connecting mechanism (5), wherein the bottom end of the connecting mechanism (5) is rotatably connected to the drain pipe (62), and the connecting mechanism (5) is connected to the supporting mechanism (1); the connecting mechanism (5) comprises a connecting block (51), a fixing sleeve (52), a connecting rod (53), a fan blade (54) and a hose (55), and the two ends of the hose (55) are connected to the steel frame (11) and the fixing sleeve (52); the bottom end of the fixing sleeve (52) is mounted with the connecting block (51), the interior of the fixing sleeve (52) is rotatably connected to the drain pipe (62), the bottom end of the hollow drain pipe (62) is fixedly connected to the connecting rod (53), the fan blade (54) is mounted on the bottom end of the hollow drain pipe (62), and the fan blade (54) is aligned with one end of the hose (55); A rock layer (4), wherein the support mechanism (1) is installed on the side wall of the rock layer (4), and the anchor rod (3) extends into the interior of the rock layer (4).

2. The initial support device for a soft surrounding rock biased double-arch tunnel according to claim 1 is characterized in that: The support rods (32) extend into the interior of the rock layer (4), and the baffles (33) with arc-shaped side walls are staggeredly installed on the side walls of the support rods (32), and the bending directions of adjacent baffles (33) are different.

3. The initial support device for a soft surrounding rock biased double-arch tunnel according to claim 1 is characterized in that: The mounting tube (61) is installed inside the support rod (32), the top end of the mounting tube (61) is fixedly connected to the fixing block (35), and the tip (66), the filter screen (65) and the connecting plate (63) are installed inside the fixing block (35).

4. The initial support device for a soft surrounding rock biased double-arch tunnel according to claim 1 is characterized in that: The maximum diameter of the conical tip (66) is equal to the maximum diameter of the connecting plate (63), the diameter of the filter (65) is smaller than the maximum diameter of the tip (66), and the longest vertical distance between the two protrusions (64) is greater than the maximum diameter of the tip (66).

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