Complex marlstone tunnel excavation deformation comprehensive prevention and control system and construction method

Abstract

The invention relates to a complex marlstone tunnel excavation deformation comprehensive prevention and control system and a construction method. A reserved stable body and a back pressure body are arranged at the position, corresponding to an outer side karst cave, in a tunnel, and a sand bag ballasting body and a profile steel back pressure support system are arranged on one side of the outer side of the back pressure body; according to the method, the collapse cavity position is firstly backfilled with a back pressure body to construct and refer to the outer side karst cave, the method capable of improving complex marlstone tunnel construction cave top collapse and cave side karst cave treatment is provided, anchor rod driving and grouting of the outer side karst cave and the collapse cavity are achieved, the safety control difficulty is lowered, and the site construction efficiency is improved; and good technical economic and social benefits can be obtained when the method is applied to practical engineering.

Description

Technical Field

[0001] The present invention belongs to the field of comprehensive prevention and control of tunnel excavation deformation, and in particular relates to a comprehensive prevention and control system for complex marlstone tunnel excavation deformation and a construction method. Background Art

[0002] With the rapid development of the economy, tunnel construction has developed rapidly. In particular, tunnel excavation in mountainous areas is becoming more and more frequent, especially in complex marlstone tunnel excavation and deformation construction, which may encounter cave roof collapse and cave side karst caves. How to reduce the difficulty of safety control and improve on-site construction efficiency is a problem that needs to be solved urgently.

[0003] In summary, for the construction of a comprehensive prevention and control system for excavation deformation of complex marlstone tunnels, it is very important to seek a comprehensive prevention and control system for excavation deformation of complex marlstone tunnels and its construction method with fast construction speed, simple operation, reliable construction quality and high safety. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a comprehensive prevention and control system for deformation during excavation of a complex marlstone tunnel and a construction method.

[0005] The construction method of this complex marlstone tunnel excavation deformation comprehensive prevention and control system includes the following steps:

[0006] Step 1: Use the drilling guide device to drive anchor rods into the marl around the tunnel outside the tunnel;

[0007] Step 2: a reserved stabilizing body and a counter-pressure body are set in the tunnel at the position corresponding to the outer cave, and a sand bag weight body and a steel counter-pressure support system are set on the outer side of the counter-pressure body; anchor rods are driven at the position corresponding to the outer cave and then the outer cave is filled;

[0008] Step 3: Backfill the back pressure body at the collapsed cavity position, construct anchor rods and pipe scaffold pipes from the collapsed cavity outward, and set the first steel frame at the bottom of the collapsed cavity;

[0009] Step 4: After the first and second steel frames are constructed inside the tunnel, the formwork is set up and the primary lining concrete is poured;

[0010] Step 5: Install waterproof board on the outside of the primary lining, and then carry out the construction of the secondary lining and the invert.

[0011] Preferably, the drilling guide device includes a bracket base plate, a liftable support frame, a hole guide drill, elastic support ribs, a guide ring tube, a hole guide drill rod, a dust cover, elastic connecting ribs, a dust connecting pipe and a dust storage box; the hole guide drill rig is fixed on the liftable support frame, and the hole guide drill rod passes through the guide ring tube; the guide ring tube is fixed by elastic support ribs and elastic connecting ribs; dust reduction is carried out during the anchor rod driving process through the dust cover, dust connecting pipe and dust storage box.

[0012] Preferably, the steel section counter-pressure support system includes a steel section counter-pressure support, a counter-pressure rod, a sleeve, an adjustable strut, a steel plate base, anti-skid ribs and a separate strut, wherein the anti-skid ribs are welded to the lower part of the steel plate base, the adjustable strut is placed on the upper part, the separate strut is installed between the steel section counter-pressure support and the steel plate base, sleeves are provided on both the counter-pressure rod and the steel plate base, and the adjustable strut is located inside the sleeve.

[0013] Preferably, in step 2, prefabricated guard arches are installed in blocks in the outer cave and fixed with anchor rods, injection pipes and drainage pipes are set on the prefabricated guard arches, and a glass fiber reinforcement mesh is laid in the outer cave to achieve reinforcement of the outer cave; after the foam concrete is pumped in layers through the injection pipe, a buffer weight layer is set on the top of the foam concrete.

[0014] Preferably, in step three, the pipe-roof pipes, the collapsed cavity anchor rods and the first steel frame are constructed simultaneously, and grouting is performed through the pipe-roof pipes to form a consolidation grouting area; a steel mesh is arranged on the inner wall of the collapsed cavity, the steel mesh is connected to the anchor rods, and plain concrete is sprayed on the outer side of the steel mesh; drainage holes and glass fiber reinforcement mesh are arranged in the collapsed cavity, a prefabricated top plate is arranged at the bottom of the collapsed cavity, a perfusion pipe is arranged on the prefabricated top plate, and foam concrete is pumped into the collapsed cavity in layers through the perfusion pipe; the prefabricated top plate is supported on the first steel frame.

[0015] Preferably, the primary lining layer includes a first steel frame, a second steel frame, steel frame connecting bars, a steel mesh and an interface mortar layer, wherein the first steel frame and the second steel frame are connected and fixed by the steel frame connecting bars; the steel mesh and the anchor rods are fixed as a whole, wherein the steel frame connecting bars and the steel mesh are welded; the first steel frame and the second steel frame are processed from I-beams, and locking channel steels are arranged at the lower parts of the first steel frame and the second steel frame, wherein the locking channel steels and the locking anchor rods are welded as a whole; after the construction of the first steel frame and the second steel frame is completed, a formwork is set up to pour the primary lining layer concrete.

[0016] Preferably, the steel frame correction device includes a U-shaped fixed plate, a fixed shaft, a movable hanging rod, an anti-displacement baffle, a jack and a correction circular plate; an anti-displacement baffle is arranged at the bottom of the U-shaped fixed plate, and fixed shafts are welded on both sides, wherein the movable hanging rod is in the shape of a letter "U" and can rotate around the fixed shaft; the jack is located in the U-shaped fixed plate, wherein a correction circular plate is arranged at the lifting end of the jack; the movable hanging rod is fixed on the flange plate of the first steel frame, and the correction circular plate is supported on the second steel frame, and the adjusting jack is used to correct the position and shape of the second steel frame.

[0017] A comprehensive prevention and control system for deformation during excavation of complex marlstone tunnels is obtained by any of the methods described above.

[0018] The beneficial effects of the present invention are:

[0019] The invention provides a reserved stabilizing body and a counter-pressure body corresponding to the outer karst cave position in the tunnel, and a sandbag weight body and a steel counter-pressure support system are arranged on the outer side of the counter-pressure body; the collapsed cavity position is first backfilled, and the construction of the counter-pressure body refers to the outer karst cave, providing a method for improving the roof collapse and side karst cave treatment in complex marlstone tunnel construction, realizing the anchoring and grouting of the outer karst cave and collapsed cavity, reducing the difficulty of safety control, and improving the efficiency of on-site construction. It can achieve better technical, economic and social benefits when applied to actual projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional schematic diagram of the comprehensive prevention and control system for excavation deformation of complex marlstone tunnels;

[0021] Figure 2 It is a schematic diagram of the construction of the drilling guide device;

[0022] Figure 3 This is a schematic diagram of the cross section of the backfilled counterpressure body of the outer cave;

[0023] Figure 4 This is a schematic diagram of the bottom of the steel back pressure support system;

[0024] Figure 5 This is a schematic diagram of the treatment of the outer cave;

[0025] Figure 6 This is a schematic diagram of the glass fiber reinforcement mesh;

[0026] Figure 7 It is a schematic diagram of the reinforcement of the collapsed cavity position;

[0027] Figure 8 This is a schematic diagram of the cross section of the collapsed cavity treatment;

[0028] Fig. 9 This is a schematic diagram of the steel frame correction device.

[0029] In the figure: 1- marl around the tunnel, 2- locking anchor rod, 3- locking channel steel, 4- first steel frame, 5- second steel frame, 6- steel frame connecting bar, 7- steel mesh, 8- interface mortar layer, 9- anchor rod, 10- tunnel center line, 11- bracket bottom plate, 12- lifting bracket, 13- guide hole drilling rig, 14- elastic support bar, 15- guide ring tube, 16- guide hole drilling rod, 17- dust cover, 18- elastic connecting bar, 19- dust connecting pipe, 20- dust storage box, 21- outer cave, 22- reserved stabilizing body, 23- backfill counter pressure body, 24- steel counter pressure bracket, 25- counter pressure rod, 26- sleeve, 27- adjustable support rod, 28 -Sandbag weight, 29-steel plate base, 30-anti-skid ribs, 31-separate support rods, 32-inverted arch, 33-prefabricated arch guard, 34-secondary lining, 35-waterproof board, 36-primary lining, 37-pouring pipe, 38-drainage pipe, 39-glass fiber reinforcement net, 40-foam concrete, 41-buffering weight layer, 42-tie wire, 43-collapse cavity, 44-plain sprayed concrete, 45-drainage hole, 46-pipe shed pipe, 47-consolidation grouting area, 48-prefabricated top plate, 49-steel frame correction device, 50-U-shaped fixing plate, 51-fixed shaft, 52-movable hanging rod, 53-anti-shift baffle, 54-jack, 55-correction circular plate. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0031] Embodiment 1

[0032] As an example, Figures 1 to 9As shown, this complex marlstone tunnel excavation deformation comprehensive prevention and control system includes: marl around the tunnel 1, locking anchor rod 2, locking channel steel 3, first steel frame 4, second steel frame 5, steel frame connecting bar 6, steel mesh 7, interface mortar layer 8, anchor rod 9, tunnel center line 10, support base plate 11, liftable support frame 12, guide hole drilling rig 13, elastic support bar 14, guide ring tube 15, guide hole drilling rod 16, dust cover 17, elastic connecting bar 18, dust connecting pipe 19, dust storage box 20, outer cave 21, reserved stabilizing body 22, backfill back pressure body 23, steel back pressure support 24, back pressure rod 25, sleeve 26, adjustable support rod 27, sand bag weight 28, steel plate base 29, anti-skid bar 3 0, separate struts 31, inverted arch 32, prefabricated arch protection 33, second lining 34, waterproof board 35, primary lining 36, injection pipe 37, drainage pipe 38, glass fiber reinforcement mesh 39, foam concrete 40, buffer pressure layer 41, wire tying 42, collapsed cavity 43, plain sprayed concrete 44, drainage hole 45, pipe shed pipe 46, consolidation grouting area 47, prefabricated top plate 48, steel frame correction device 49, U-shaped fixed plate 50, fixed shaft 51, movable hanging rod 52, anti-shift baffle 53, jack 54, correction circular plate 55; developed collapse combined reinforcement technology, complex arch steel frame uneven treatment adjustable short column support technology, buffer layer concrete arch protection sealing technology, cave cavity lightweight reinforcement filling technology, etc.

[0033] The primary lining 36 is composed of a first steel frame 4, a second steel frame 5, a steel frame connecting bar 6, a steel mesh 7, an interface mortar layer 8, etc., wherein the first steel frame 4 and the second steel frame 5 are connected and fixed by the steel frame connecting bar 6; the steel mesh 7 and the anchor rod 9 are fixed as a whole, wherein the steel frame connecting bar 6 and the steel mesh 7 are welded; the first steel frame 4 and the second steel frame 5 are processed from I-beams, and a locking foot channel steel 3 is arranged at the lower part, wherein the locking foot channel steel 3 and the locking foot anchor rod 2 are welded as a whole, thereby realizing the combined stability of the composite steel frame; after the construction of the first steel frame 4 and the second steel frame 5 is completed, a template is supported and concrete is poured;

[0034] like Figure 8 As shown, the steel frame correction device 49 is composed of a U-shaped fixed plate 50, a fixed shaft 51, a movable hanging rod 52, an anti-shift baffle 53, a jack 54, a correction circular plate 55, etc.; an anti-shift baffle 53 is arranged at the bottom of the U-shaped fixed plate 50, and fixed shafts 51 are welded on both sides, wherein the movable hanging rod 52 is 7-shaped and can rotate around the fixed shaft 51; the jack 54 is located in the U-shaped fixed plate 50, wherein a correction circular plate 55 is arranged at the lifting end of the jack 54; the movable hanging rod 52 is fixed on the flange plate of the first steel frame 4, and the correction circular plate 55 is supported on the second steel frame 5, and the jack 54 can be adjusted to correct the position and uneven shape of the second steel frame 5, and can also ensure the accuracy and quality of the connection position of the steel frame connecting reinforcement 6 with the first steel frame 4 and the second steel frame 5.

[0035] Embodiment 2

[0036] As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific comprehensive prevention and control system for deformation during excavation of complex marlstone tunnels:

[0037] like Figure 2 As shown, the anchor rod 9 is driven by a special drilling guide device, wherein the special drilling guide device consists of a bracket bottom plate 11, a liftable support frame 12, a hole-guiding drill 13, elastic support ribs 14, a guide ring tube 15, a hole-guiding drill rod 16, a dust cover 17, an elastic connecting rib 18, a dust connecting pipe 19, a dust storage box 20, etc.; the hole-guiding drill 13 is fixed on the liftable support frame 12, and the hole-guiding drill rod 16 passes through the guide ring tube 15; the guide ring tube 15 is fixed by the elastic support ribs 14 and the elastic connecting ribs 18; during the driving process of the anchor rod 9, dust reduction treatment is carried out through the dust cover 17, the dust connecting pipe 19, and the dust storage box 20;

[0038] like Figure 3 As shown, the outer cave 21 is provided with a reserved stabilizing body 22, and a backfilled counter-pressure body 23, the backfilled counter-pressure body 23 is construction waste soil, and a sandbag weight body 28 and a steel counter-pressure support 24 system are arranged on one side of the outer side; the steel counter-pressure support 24 system is composed of a steel counter-pressure support 24, a counter-pressure rod 25, a sleeve 26, an adjustable strut 27, a steel plate base 29, anti-skid ribs 30, and a separate strut 31, wherein the anti-skid ribs 30 are welded at the lower part of the steel plate base 29, and an adjustable strut 27 is placed at the upper part, and a separate strut 31 is installed between the steel counter-pressure support 24 and the steel plate base 29, and sleeves 26 are arranged on the counter-pressure rod 25 and the steel plate base 29, and the adjustable strut 27 is located in the sleeve 26 to prevent it from shifting; the steel counter-pressure support After the construction of the 24 system is completed, the anchor rod 9 is driven; after the anchor rod 9 is driven, the outer cave 21 is cleaned and filled, and the prefabricated protective arch 33 is installed in the outer cave 21 in blocks and fixed with the anchor rod 9, and a perfusion pipe 37 and a drainage pipe 38 are arranged on it, and a glass fiber reinforcement net 39 is laid, which can realize the reinforcement of the outer cave of the tunnel and enhance the integrity of the filling material inside the tunnel; after the foam concrete 40 is pumped in layers through the perfusion pipe 37, a buffer pressure weight layer 41 is arranged on the top of the foam concrete 40, and the buffer pressure weight layer 41 is 30cm sand, which realizes the rapid filling of the cave and reduces the compressive stress of the tunnel support structure; after the outer cave 21 is filled, the primary lining 36, the waterproof board 35, the secondary lining 34, the invert 32 and the like are constructed on the outer side thereof in sequence;

[0039] like Figure 7As shown, the collapsed cavity 43 is first backfilled with the counter-pressure body 23 with reference to the outer cave 21, and then the pipe-roof pipe 46, the collapsed cavity 43 anchor rod, and the first steel frame 4 are constructed simultaneously, and the pipe-roof pipe 46 is grouted to form a consolidation grouting area 47; the steel mesh 7 is connected to the anchor rod, and the outside is sprayed with plain concrete 44; drainage holes 45 and a glass fiber reinforcement net 39 are arranged in the collapsed cavity 43, wherein the glass fiber reinforcement net 39 is formed by tying glass fiber reinforcements with wires 42; a perfusion pipe 37 is arranged on the prefabricated top plate 48, and the foam concrete 40 is pumped in layers through the perfusion pipe 37; the prefabricated top plate 48 is supported on the first steel frame 4.

[0040] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0041] Embodiment 3

[0042] As another embodiment, this embodiment 3 proposes, based on the first and second embodiments, a construction method of the complex marlstone tunnel excavation deformation comprehensive prevention and control system, comprising the following steps:

[0043] Step 1: Anchor construction:

[0044] like Figure 2 As shown, the anchor rod 9 is set by a special drilling guide device, wherein the special drilling guide device consists of a bracket bottom plate 11, a liftable support frame 12, a hole guide drill 13, elastic support ribs 14, a guide ring tube 15, a hole guide drill rod 16, a dust cover 17, an elastic connecting rib 18, a dust connecting pipe 19, a dust storage box 20, etc.; the hole guide drill 13 is fixed on the liftable support frame 12, and the hole guide drill rod 16 passes through the guide ring tube 15; the guide ring tube 15 is fixed by the elastic support ribs 14 and the elastic connecting ribs 18; during the setting of the anchor rod 9, dust reduction treatment is carried out through the dust cover 17, the dust connecting pipe 19, and the dust storage box 20;

[0045] Step 2: Treatment of outer caves:

[0046] like Figures 3 to 5As shown, a reserved stabilizing body 22 is provided in the outer cave 21, and a backfilled counter-pressure body 23 is backfilled. The backfilled counter-pressure body 23 is construction waste soil, and a sandbag weight body 28 and a steel counter-pressure support 24 system are provided on one side of the outer side thereof; the steel counter-pressure support 24 system is composed of a steel counter-pressure support 24, a counter-pressure rod 25, a sleeve 26, an adjustable strut 27, a steel plate base 29, anti-skid ribs 30, and a separate strut 31, wherein the anti-skid ribs 30 are welded at the lower part of the steel plate base 29, and an adjustable strut 27 is placed at the upper part; a separate strut 31 is installed between the steel counter-pressure support 24 and the steel plate base 29, and sleeves 26 are provided on the counter-pressure rod 25 and the steel plate base 29; the adjustable strut 31 is provided on the 27 is located in the sleeve 26 to prevent it from shifting; after the construction of the steel counter-pressure support 24 system is completed, the anchor rod 9 is driven; after the anchor rod 9 is driven, the outer cave 21 is cleaned and filled, and the prefabricated arch 33 is installed in the outer cave 21 in blocks and fixed with the anchor rod 9, and a perfusion pipe 37 and a drainage pipe 38 are arranged on it, and a glass fiber reinforcement net 39 is laid, which can realize the reinforcement of the outer cave of the tunnel and enhance the integrity of the filling material inside the tunnel; after the foam concrete 40 is pumped in layers through the perfusion pipe 37, a buffer weight layer 41 is set on the top of the foam concrete 40, and the buffer weight layer 41 is 30cm sand, which realizes the rapid filling of the cave and reduces the compressive stress of the tunnel support structure;

[0047] Step 3: Collapse treatment construction:

[0048] like Figures 7 and 8 As shown, the collapse cavity 43 is first backfilled with the counter-pressure body 23 with reference to the outer cave 21, and then the pipe-roof pipe 46 and the anchor rod of the collapse cavity 43 and the first steel frame 4 are constructed synchronously, and the pipe-roof pipe 46 is grouted to form a consolidation grouting area 47; the steel mesh 7 is connected with the anchor rod, and the outside is sprayed with plain sprayed concrete 44; the collapse cavity 43 is provided with drainage holes 45 and a glass fiber reinforcement net 39, wherein the glass fiber reinforcement net 39 is formed by tying glass fiber reinforcements with wires 42; the prefabricated top plate 48 is provided with a perfusion pipe 37, and the foam concrete 40 is pumped in layers through the perfusion pipe 37; the prefabricated top plate 48 is supported on the first steel frame 4;

[0049] Step 4: Primary lining construction:

[0050] like Figure 1 As shown, the primary lining 36 is composed of a first steel frame 4, a second steel frame 5, a steel frame connecting bar 6, a steel mesh 7, an interface mortar layer 8, etc., wherein the first steel frame 4 and the second steel frame 5 are connected and fixed by the steel frame connecting bar 6; the steel mesh 7 and the anchor rod 9 are fixed as a whole, wherein the steel frame connecting bar 6 and the steel mesh 7 are welded; the first steel frame 4 and the second steel frame 5 are processed from I-beams, and a locking foot channel steel 3 is arranged at the lower part, wherein the locking foot channel steel 3 and the locking foot anchor rod 2 are welded as a whole, thereby realizing the combined stability of the composite steel frame; after the construction of the first steel frame 4 and the second steel frame 5 is completed, a template is supported and concrete is poured;

[0051] Step 5: Secondary lining construction:

[0052] After the construction of the primary lining 36 is completed, a waterproof board 35 is arranged on the outside thereof, and then the construction of the secondary lining 34, the invert 32, etc. is carried out.

[0053] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a comprehensive prevention and control system for excavation deformation of a complex marlstone tunnel, characterized in that: The following steps are involved: Step 1: Driving anchor rods into the marlstone around the tunnel outside the tunnel through the drilling guide device; Step 2: a reserved stabilizing body and a counter-pressure body are set in the tunnel at the position corresponding to the outer cave, and a sand bag weight body and a steel counter-pressure support system are set on the outer side of the counter-pressure body; anchor rods are driven at the position corresponding to the outer cave and then the outer cave is filled; Step 3: Backfill the back pressure body at the collapsed cavity position, construct anchor rods and pipe scaffold pipes from the collapsed cavity outward, and set the first steel frame at the bottom of the collapsed cavity; Step 4: After the first and second steel frames are constructed inside the tunnel, the formwork is set up and the primary lining concrete is poured; Step 5: Install waterproof board on the outside of the primary lining, and then carry out the construction of the secondary lining and the invert.

2. The construction method of the comprehensive prevention and control system for excavation deformation of complex marlstone tunnels according to claim 1 is characterized in that: The drilling guide device includes a bracket base plate, a liftable support frame, a hole guide drill, elastic support ribs, a guide ring tube, a hole guide drill rod, a dust cover, elastic connecting ribs, a dust connecting pipe and a dust storage box; the hole guide drill rig is fixed on the liftable support frame, and the hole guide drill rod passes through the guide ring tube; the guide ring tube is fixed by elastic support ribs and elastic connecting ribs; dust reduction is carried out during the anchor rod installation process through the dust cover, dust connecting pipe and dust storage box.

3. The construction method of the comprehensive prevention and control system for excavation deformation of complex marlstone tunnels according to claim 1 is characterized in that: The steel-shaped counter-pressure support system includes a steel-shaped counter-pressure support, a counter-pressure rod, a sleeve, an adjustable strut, a steel plate base, anti-skid ribs and a separate strut, wherein the anti-skid ribs are welded to the lower part of the steel plate base, and the adjustable strut is placed on the upper part. The separate strut is installed between the steel-shaped counter-pressure support and the steel plate base, and sleeves are arranged on the counter-pressure rod and the steel plate base, and the adjustable strut is located in the sleeve.

4. The construction method of the complex marlstone tunnel excavation deformation comprehensive prevention and control system according to claim 1 is characterized in that: In step two, prefabricated guard arches are installed in blocks in the outer cave and fixed with anchor rods. Injection pipes and drainage pipes are set on the prefabricated guard arches. A glass fiber reinforcement mesh is laid in the outer cave to reinforce the outer cave. After the foam concrete is pumped in layers through the injection pipes, a buffer weight layer is set on the top of the foam concrete.

5. The construction method of the comprehensive prevention and control system for excavation deformation of complex marlstone tunnels according to claim 1 is characterized in that: In step three, the pipe-roof pipe, the collapsed cavity anchor rod and the first steel frame are constructed simultaneously, and grouting is carried out through the pipe-roof pipe to form a consolidation grouting area; a steel mesh is arranged on the inner wall of the collapsed cavity, the steel mesh is connected to the anchor rod, and plain concrete is sprayed on the outer side of the steel mesh; drainage holes and glass fiber reinforcement mesh are arranged in the collapsed cavity, a prefabricated top plate is arranged at the bottom of the collapsed cavity, a perfusion pipe is arranged on the prefabricated top plate, and foam concrete is pumped to the collapsed cavity in layers through the perfusion pipe; the prefabricated top plate is supported on the first steel frame.

6. The construction method of the complex marlstone tunnel excavation deformation comprehensive prevention and control system according to claim 1 is characterized in that: The primary lining layer includes a first steel frame, a second steel frame, steel frame connecting bars, a steel mesh and an interface mortar layer, wherein the first steel frame and the second steel frame are connected and fixed by the steel frame connecting bars; the steel mesh and the anchor rods are fixed as a whole, wherein the steel frame connecting bars and the steel mesh are welded; the first steel frame and the second steel frame are processed from I-beams, and locking channel steels are arranged at the lower parts of the first steel frame and the second steel frame, wherein the locking channel steels and the locking anchor rods are welded as a whole; after the construction of the first steel frame and the second steel frame is completed, a formwork is set up to pour the primary lining layer concrete.

7. The construction method of the complex marlstone tunnel excavation deformation comprehensive prevention and control system according to claim 1 is characterized in that: The steel frame correction device includes a U-shaped fixed plate, a fixed shaft, a movable hanging rod, an anti-displacement baffle, a jack and a correction circular plate; an anti-displacement baffle is arranged at the bottom of the U-shaped fixed plate, and fixed shafts are welded on both sides, wherein the movable hanging rod is in the shape of a letter "U" and can rotate around the fixed shaft; the jack is located in the U-shaped fixed plate, wherein a correction circular plate is arranged at the lifting end of the jack; the movable hanging rod is fixed on the flange plate of the first steel frame, and the correction circular plate is supported on the second steel frame, and the adjusting jack is used to correct the position and shape of the second steel frame.

8. Comprehensive prevention and control system for deformation during excavation of complex marlstone tunnels, characterized by: Obtained by the method according to any one of claims 1 to 7.

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