Composite filling construction system for drainage and drainage of complex karst tunnel

Abstract

The utility model relates to a drainage and drainage combined type filling construction system for a complex karst tunnel, which is characterized in that a transverse channel is arranged between a left tunnel and a right tunnel, and a drainage branch hole is arranged on one side of the right tunnel; the karst cave hall section is divided into a shallow-buried section tunnel and a deep-buried section tunnel, stand columns are arranged on the two sides of the deep-buried section tunnel, polymers and brick walls are arranged on the top of the deep-buried section tunnel, and a cavity area below the deep-buried section tunnel is filled with grouting bodies and foam concrete; a block stone layer and a rubble layer are sequentially arranged above a cavity contour line at the bottom of the shallow-buried section tunnel karst cave hall; brick walls are arranged on the two sides of the shallow buried section tunnel, and concrete slabs are arranged at the upper ends of the brick walls; a C10 concrete layer is arranged below the concrete slab; and a foam concrete layer is arranged above the concrete slab. According to the foam concrete composite filling construction method for the underground cavity in the tunnel crossing area, the problem of drainage in the tunnel underground river section is solved, the drainage collection procedure is simplified, and the difficulty of column and filling construction in the karst cave section is reduced.

Description

Technical Field

[0001] The utility model relates to a complex karst tunnel drainage and diversion composite filling construction system, which is mainly applicable to the tunnel excavation construction in complex environments. Background Art

[0002] In the mountainous areas in the western part of China, there are a large number of karst landforms. During the large-scale construction and rapid development of highways, highway tunnels will inevitably pass through karst caves. Due to the complexity of hydrogeological and engineering geological conditions of large karst caves, it brings great difficulties to the design and construction of tunnels. Among many karst treatment schemes, the cave-type karst tunnels generally adopt backfill treatment.

[0003] For the tunnel construction under complex lava geological conditions, the following problems will be encountered: (1) how to release energy and reduce pressure for water-rich and high-pressure solution cavities; (2) it is difficult to construct the formwork and filling during the column support in the lava area, and the safety risk is high; (3) how to quickly dispose of the karst cave hall.

[0004] In view of this, in view of a series of problems that occur during the tunnel construction under complex karst geological conditions, there is an urgent need to provide a simple and effective complex karst tunnel drainage and diversion composite filling construction system to reduce the energy release and pressure reduction of water-rich and high-pressure solution cavities and the construction difficulty of columns, reduce the construction safety risk, and speed up the construction progress. Summary of the Invention

[0005] The purpose of the utility model is to reduce the energy release and pressure reduction of water-rich and high-pressure solution cavities and the construction difficulty of columns, reduce the construction safety risk, and has the advantages of significantly saving construction costs and improving the construction efficiency of the steel section stiffening pile retaining wall.

[0006] To achieve the above technical purpose, the utility model adopts the following technical solutions:

[0007] A complex karst tunnel drainage and diversion composite filling construction system, a transverse channel is arranged between the left-line tunnel and the right-line tunnel, and a drainage branch tunnel is arranged on one side of the right-line tunnel;

[0008] The karst cave hall section is divided into a shallow-buried section tunnel and a deep-buried section tunnel. Columns are arranged on both sides of the deep-buried section tunnel. A polymer and a brick wall are arranged on the top of the deep-buried section tunnel. Steel pipe piles are driven at the bottom of the deep-buried section tunnel. The cavity area below the deep-buried section tunnel is filled with grouting material and foam concrete;

[0009] Above the cavity contour line at the bottom of the karst cave hall in the shallow-buried section tunnel, a block stone layer and a gravel layer are sequentially arranged. The shallow-buried section tunnel is located above the gravel layer; Brick walls are arranged on both sides of the shallow-buried section tunnel, and a concrete slab is arranged at the upper end of the brick wall; A C10 concrete layer is arranged below the concrete slab; A foam concrete layer is arranged above the concrete slab;

[0010] It also includes a column supporting formwork system for construction columns.

[0011] Preferably, an anchor shotcrete protection system is provided on the top of the karst cave hall in the shallow-buried section tunnel. The anchor shotcrete protection system includes anchor rods arranged successively along the cavity contour line on the top of the karst cave hall in the shallow-buried section tunnel, and the anchor rods are partially inserted into the rock mass.

[0012] Preferably, grouting holes and air vents are drilled on the ground, and the grouting holes and air vents are communicated to the karst cave hall in the shallow-buried section tunnel.

[0013] Preferably, the column supporting formwork system includes a sealing plate, a special-shaped casing, an upper steel formwork, a lower steel formwork, and a fixing rod. The sealing plate is arranged outside the karst cavity. Reinforcing bars are welded on both the upper and lower sides of the sealing plate. Grouting holes and air vents are provided on the sealing plate. The sealing plate is fixed to the rock mass by bolts. A special-shaped casing is provided at the lower end of the sealing plate. A vibrating port and a pumping port are provided on the special-shaped casing; an upper steel formwork is provided at the lower end of the special-shaped casing, and a lower steel formwork is provided below the upper steel formwork. Steel blocks are welded on the upper steel formwork, and the steel blocks are welded on the outer side of the upper steel formwork. Fixing holes are provided on the steel blocks. The upper part of the fixing rod is inserted into the fixing holes; the lower part of the fixing rod is fixed to a self-standing hoop, and the self-standing hoop is arranged on the lower steel formwork. Triangular ear plates are provided on the self-standing hoop, and a telescopic rod is provided at the bottom of the triangular ear plate. The lower end of the telescopic rod is connected to a cross brace, and the cross brace is fixed to a concrete base. The lower end of the lower steel formwork is fixedly arranged on the concrete base.

[0014] Preferably, ear plates are welded on the special-shaped casing, and the ear plates are located on both sides of the special-shaped casing. Special-shaped steel bars are implanted into the rock mass, and the special-shaped steel bars are welded to the ear plates.

[0015] Preferably, a hoop is provided on the steel block, and the hoop is arranged around the steel block to tightly hoop the steel block on the outer side of the upper steel formwork.

[0016] Preferably, a flange is provided at the tunnel entrance of the drainage branch tunnel. A hose is arranged inside the flange. The flange is fixed by inclined bracing steel pipes and vertical bracing steel pipes. The inclined bracing steel pipes and the vertical bracing steel pipes are connected by flexible connectors. Cushion blocks are provided at the bottoms of the inclined bracing steel pipes and the vertical bracing steel pipes.

[0017] Preferably, movable grooves are provided on the inclined bracing steel pipes and the vertical bracing steel pipes. A connecting cross bar is arranged between the inclined bracing steel pipes and the vertical bracing steel pipes. The connecting cross bar simultaneously passes through the movable grooves on the inclined bracing steel pipes and the vertical bracing steel pipes. The connecting cross bar is fixedly connected to the inclined bracing steel pipes and the vertical bracing steel pipes by fixing bolts.

[0018] The utility model has the following characteristics and beneficial effects:

[0019] 1. The energy release and pressure reduction technology for the solution cavity is proposed. A transverse channel is set by means of bypassing, solving the construction problems of the tunnel to be excavated and avoiding the construction safety risks.

[0020] 2. The flat guide water drainage and pressure reduction technology is proposed. The flat guide water drainage device composed of vertical support steel pipes, inclined support steel pipes, etc. simplifies the construction process and speeds up the construction progress.

[0021] 3. The protection technology for the cavity at the top of the column is proposed. The cavity filling construction is carried out by using the non-dismantling plugging plate, which speeds up the construction progress and reduces the safety risk.

[0022] 4. The column supporting formwork system is proposed. The formwork system composed of special-shaped casing tubes, upper steel formwork, lower steel formwork, etc. solves the problems of the large formwork entering the narrow space and the formwork fixation, and reduces the construction difficulty.

[0023] 5. The composite filling technology for the karst cave hall is proposed. The large cavity filling structure and construction system are proposed for tunnels with different buried depths, which solves the construction problems in the karst cave area. Brief Description of the Drawings

[0024] Figure 1 is the current situation diagram of the complex environment in the tunnel crossing area of the present utility model;

[0025] Figure 2 is the construction schematic diagram of cavity energy release and pressure reduction;

[0026] Figure 3 is the construction schematic diagram of flat guide water drainage and pressure reduction;

[0027] Figure 4 is the schematic diagram of the flat guide water drainage device;

[0028] Figure 5 is the schematic diagram of column supporting and protection;

[0029] Figure 6 is the schematic diagram of the self-standing hoop;

[0030] Figure 7 is the schematic diagram of the special-shaped casing tube;

[0031] Figure 8 is the construction schematic diagram of the karst cave hall in the deep-buried section tunnel;

[0032] Figure 9 is the construction schematic diagram of the karst cave hall in the shallow-buried section tunnel;

[0033] Among them: 1 - newly built tunnel, 2 - fissure channel, 3 - underground river, 4 - sac-shaped solution cavity, 5 - accumulated stones, 6 - block stones, 7 - karst cavity, 8 - rock mass, 9 - tunnel excavation contour line, 10 - cavity contour line, 11 - crushed stones, 12 - C10 concrete, 13 - foam concrete, 14 - left-line tunnel, 15 - transverse passage, 16 - rock mass to be excavated, 17 - water-rich solution cavity, 18 - drainage branch tunnel, 19 - right-line tunnel, 20 - inclined support steel pipe, 21 - flexible connecting piece, 22 - fixing bolt, 23 - vertical support steel pipe, 24 - connecting cross bar, 25 - cushion block, 26 - movable groove, 27 - flexible pipe, 28 - galvanized steel pipe, 29 - flange, 30 - sealing plate, 31 - air vent, 32 - mortar, 33 - steel bars, 34 - grouting hole, 35 - bolt, 36 - special-shaped steel bars, 37 - vibrating port, 38 - special-shaped casing, 39 - pumping port, 40 - ear plate, 41 - upper steel formwork, 42 - steel block, 43 - hoop, 44 - fixing hole, 45 - fixing rod, 46 - triangular ear plate, 47 - telescopic rod, 48 - lower steel formwork, 49 - concrete base, 50 - self-standing hoop, 51 - flexible end, 52 - cross brace, 53 - column, 54 - solution cavity boundary, 55 - high polymer, 56 - brick wall, 57 - steel pipe pile, 58 - grouting body, 59 - anchor bolt, 60 - concrete slab, 61 - ground, 62 - grouting pipe, 63 - slurry replenishing hole. Detailed implementation method

[0034] Example 1

[0035] As Figure 1 shown, the tunnel system on which the water drainage and diversion composite filling construction system for the complex karst tunnel depends is composed of a newly built tunnel 1, a fissure channel 2, a sac-shaped solution cavity 4, an underground river 3, accumulated stones 5, etc.

[0036] As Figure 2 shown, the right-line tunnel 19 has a water-rich solution cavity 17. A transverse passage 15 is arranged between the left-line tunnel 14 and the right-line tunnel 19, and the transverse passage 15 connects the left-line tunnel 14 and the right-line tunnel 19; the transverse passage 15 is arranged in front of the rock mass 16 to be excavated, and a drainage branch tunnel 18 is arranged on one side of the right-line tunnel 19, and the drainage branch tunnel 18 is located behind the rock mass 16 to be excavated.

[0037] As Figure 3 , 4As shown in the figure, fissure channels 2 are distributed along the cavity contour line 10 on the right-line tunnel 19. A drainage branch tunnel 18 is arranged on one side of the right-line tunnel 19. One end of the drainage branch tunnel 18 is communicated with the water-rich solution cavity 17, and the other end is the tunnel entrance of the drainage branch tunnel. A flange 29 is arranged at the tunnel entrance of the drainage branch tunnel 18. A hose 27 is arranged inside the flange 29. The flange 29 is fixed by a diagonal bracing steel pipe 20 and a vertical bracing steel pipe 23. The diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 are connected by a flexible connector 21. An activity groove 26 is arranged on the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23. A cushion block 25 is arranged at the bottom of the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23. A connecting cross bar 24 is arranged between the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23. The connecting cross bar 24 passes through the activity grooves 26 on the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 at the same time. The connecting cross bar 24 is fixedly connected with the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 through a fixing bolt 22.

[0038] As Figure 5 , 6 As shown in FIGS. 7, the column supporting formwork system includes a sealing plate 30, a special-shaped casing 38, an upper steel formwork 41, a lower steel formwork 48, and a fixing rod 45. The karst cavity 7 is injected with mortar 32 for reinforcement. A sealing plate 30 is arranged outside the karst cavity 7. Reinforcing bars 33 are welded on the upper and lower sides of the sealing plate 30 respectively. A grouting hole 34 and an air outlet hole 31 are arranged on the sealing plate 30. The sealing plate 30 is fixed on the rock mass through bolts 35. A special-shaped casing 38 is arranged at the lower end of the sealing plate 30. A vibrating port 37 and a pumping port 39 are arranged on the special-shaped casing 38. Ear plates 40 are welded on the special-shaped casing 38. The ear plates 40 are located on both sides of the special-shaped casing 38. Special-shaped steel bars 36 are implanted in the rock mass. The special-shaped steel bars 36 are welded to the ear plates 40. An upper steel formwork 41 is arranged at the lower end of the special-shaped casing 38. A lower steel formwork 48 is arranged below the upper steel formwork 41. Steel blocks 42 are welded on the upper steel formwork 41. The steel blocks 42 are welded on the outer side of the upper steel formwork 41. Hoop clamps 43 are arranged on the steel blocks 42. The hoop clamps 43 are arranged around the steel blocks 42. The hoop clamps 43 clamp the steel blocks 42 tightly on the outer side of the upper steel formwork 41. Fixing holes 44 are arranged on the steel blocks 42. The upper part of the fixing rod 45 is inserted into the fixing holes 44. The upper part of the fixing rod 45 is locked and fixed in the fixing holes 44 through bolts 35. The lower part of the fixing rod 45 is fixed on a self-standing hoop clamp 50. The self-standing hoop clamp 50 is arranged on the lower steel formwork 48. Triangular ear plates 46 are arranged on the self-standing hoop clamp 50. A telescopic rod 47 is arranged at the bottom of the triangular ear plates 46. The lower end of the telescopic rod 47 is connected with a cross brace 52. The cross brace 52 is fixed on a concrete base 49. The lower end of the lower steel formwork 48 is fixedly arranged on the concrete base 49.

[0039] As Figure 8 , 9As shown in the figure, the karst cave hall section is divided into a shallow-buried section tunnel and a deep-buried section tunnel. Columns 53 are arranged on both sides of the deep-buried section tunnel for support, and the construction of columns 53 is carried out through the column supporting formwork system. A polymer 55 and a brick wall 56 are arranged on the top of the deep-buried section tunnel, and the polymer 55 is laid on the top of the brick wall 56. Steel pipe piles 57 are driven at the bottom of the deep-buried section tunnel, and the cavity area below the deep-buried section tunnel is filled with a grouting body 58 and foam concrete 13. Above the cavity contour line 10 at the bottom of the karst cave hall of the shallow-buried section tunnel, block stones 6 and gravel 11 are backfilled successively from bottom to top, so as to form a block stone layer and a gravel layer successively from bottom to top in the cavity area at the bottom of the karst cave hall of the shallow-buried section tunnel. The shallow-buried section tunnel is located above the gravel layer. An anchor shotcrete protection system is arranged on the top of the karst cave hall of the shallow-buried section tunnel. The anchor shotcrete protection system includes anchor bolts 59 arranged successively along the cavity contour line on the top of the karst cave hall of the shallow-buried section tunnel, and the anchor bolts 59 are partially inserted into the rock mass. Brick walls 56 are built on both sides of the shallow-buried section tunnel, and a concrete slab 60 is arranged at the upper end of the brick wall 56. Grouting equipment is arranged on the ground 61, and grouting is carried out into the tunnel through a grouting pipe 62 on the grouting equipment. The grouting pipe 62 penetrates through the rock mass and extends into the karst cave hall of the shallow-buried section tunnel. Grouting holes 63 and air outlet holes 31 are drilled on the ground, and the grouting holes 63 and the air outlet holes 31 are communicated to the karst cave hall of the shallow-buried section tunnel. C10 concrete 12 and foam concrete 13 are injected into the karst cave hall of the shallow-buried section tunnel successively through the grouting pipe 62. The C10 concrete fills the area below the concrete slab 60 and forms a C10 concrete layer below the concrete slab 60; the foam concrete 13 fills the area above the concrete slab 60 and forms a foam concrete layer above the concrete slab 60.

[0040] Embodiment 2

[0041] The construction method of the water drainage and diversion composite filling construction system for a complex karst tunnel includes the following steps:

[0042] (1) Construction of the tunnel pilot adit; the right-line tunnel 19 has a rich water soluble cavity 17. A transverse passage 15 is built between the left-line tunnel 14 and the right-line tunnel 19. The transverse passage 15 is arranged in front of the rock mass 16 to be excavated, and a water drainage adit 18 is arranged on one side of the right-line tunnel 19; one end of the water drainage adit 18 is communicated with the rich water soluble cavity 17.

[0043] (2) Tunnel drainage and pressure reduction construction; fissure channels 2 are distributed along the cavity contour line 10 on the upper part of the right-line tunnel 19. A drainage branch tunnel 18 is set behind the upper part of the right-line tunnel 19. A flange 29 is set at the tunnel entrance of the drainage branch tunnel 18. A hose 27 is set inside the flange 29. The flange 29 is fixed by a diagonal bracing steel pipe 20, and the diagonal bracing steel pipe 20 is reinforced by a vertical bracing steel pipe 23; the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 are connected by a flexible connector 21. An activity groove 26 is set on the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23. A cushion block 25 is set at the bottom of the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23. The bottom of the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 supports on the bottom of the drainage branch tunnel 18; a connecting cross bar 24 is installed between the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23. The connecting cross bar 24 passes through the activity grooves 26 on the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 at the same time. The connecting cross bar 24 is fixedly connected with the diagonal bracing steel pipe 20 and the vertical bracing steel pipe 23 through a fixing bolt 22; the hose is fixed at the tunnel entrance of the drainage branch tunnel 18 through the flange 29. One end of the hose 27 extends into the water-rich karst cave 18. The water in the water-rich karst cave 18 can be pumped out through the hose 27 by a water pump, so as to play a role in draining water and reducing pressure on the water-rich karst cave 17.

[0044] (3) Construction of columns in the tunnel karst area; the karst cavity 7 is reinforced by injecting mortar 32. A sealing plate 30 is set outside the karst cavity 7. Reinforcing bars 33 are welded on the upper and lower sides of the sealing plate 30 respectively. A grouting hole 34 and an air outlet hole 31 are set on the sealing plate 30. The sealing plate 30 is fixed on the rock mass by bolts 35. A special-shaped casing 38 is set under the sealing plate 30. A vibrating port 37 and a pumping port 39 are set on the special-shaped casing 38. Ear plates 40 are welded on the special-shaped casing 38. The ear plates 40 are welded on both sides of the special-shaped casing 38; special-shaped reinforcing bars 36 are implanted in the rock mass. The special-shaped reinforcing bars 36 and the ear plates 40 are welded. The lower end of the special-shaped casing 38 is provided with an upper steel formwork 41. A lower steel formwork 48 is set below the upper steel formwork 41; a steel block 42 is welded on the upper steel formwork 41. A hoop 43 is set around the steel block 42 for fixation. The steel block 42 is hooped outside the upper formwork 41 through the hoop 43; the upper part of the fixing rod 45 is inserted into the fixing hole 44, and the upper part of the fixing rod 45 is locked and fixed in the fixing hole 44 through the bolt 35; the lower part of the fixing rod 45 is fixed on a self-standing hoop 50. The self-standing hoop 50 is fixedly set on the lower steel formwork 48. A triangular ear plate 46 is set on the self-standing hoop 50. A telescopic rod 47 is set at the bottom of the triangular ear plate 46. The upper end of the telescopic rod 47 is a flexible end 51. The telescopic rod 47 is connected with the triangular ear plate 46 through the flexible end 51; a cross brace 53 is set on the concrete base 49. The lower end of the telescopic rod 47 is connected with the cross brace 53. The lower end of the lower steel formwork 48 is fixedly set on the concrete base 49; an upper steel formwork 41 and a lower steel formwork 48 are provided with a pouring space. Concrete is poured into the pouring space. After the concrete solidifies, a column 53 is formed. The column 53 is used for the support inside the karst cavity 7.

[0045] (4) Construction of the karst cave hall section; the karst cave hall section is divided into a shallow-buried tunnel section and a deep-buried tunnel section. Columns 53 are used for support on both sides of the deep-buried tunnel section, and the construction of columns 53 is carried out by the construction method in step (3); a polymer 55 and a brick wall 56 are arranged at the top of the deep-buried tunnel section, and the polymer 55 is laid at the upper end of the brick wall 56; steel pipe piles 57 are driven at the bottom of the deep-buried tunnel section, and the cavity area under the deep-buried tunnel section is filled with a grouting body 58 and foamed concrete 13; above the cavity contour line 10 at the bottom of the karst cave hall of the shallow-buried tunnel section, blocks 6 and gravel 11 are backfilled from bottom to top in sequence. An anchor shotcrete protection system is arranged at the top of the karst cave hall of the shallow-buried tunnel section. The anchor shotcrete protection system includes anchor bolts 59 arranged successively along the cavity contour line at the top of the karst cave hall of the shallow-buried tunnel section, and the anchor bolts 59 are partially inserted into the rock mass. Brick walls 56 are built on both sides of the shallow-buried tunnel section, and a concrete slab 60 is arranged at the upper end of the brick wall 56; grouting equipment is arranged on the ground 61, and grouting is carried out into the karst cave hall of the shallow-buried tunnel section through a grouting pipe 62 on the grouting equipment. The grouting pipe 62 penetrates through the rock mass and extends into the karst cave hall of the shallow-buried tunnel section; slurry replenishment holes 63 and air vents 31 are drilled on the ground, and the slurry replenishment holes 63 and air vents 31 communicate with the karst cave hall of the shallow-buried tunnel section; C10 concrete 12 and foamed concrete 13 are successively injected into the karst cave hall of the shallow-buried tunnel section through the grouting pipe 62. The C10 concrete fills the area below the concrete slab 60 and forms a C10 concrete layer below the concrete slab 60; the foamed concrete 13 fills the area above the concrete slab 60 and forms a foamed concrete layer above the concrete slab 60.

Claims

1. A complex karst tunnel drainage and diversion composite filling construction system, characterized in that, A transverse passage (15) is provided in the middle of the left-line tunnel (14) and the right-line tunnel (19), and a drainage branch tunnel (18) is provided on one side of the right-line tunnel (19); The karst cave hall section is divided into a shallow-buried section tunnel and a deep-buried section tunnel. Columns (53) are provided on both sides of the deep-buried section tunnel. A polymer (55) and a brick wall (56) are provided on the top of the deep-buried section tunnel. Steel pipe piles (57) are driven at the bottom of the deep-buried section tunnel. A grouting body (58) and foamed concrete (13) are filled in the cavity area below the deep-buried section tunnel; Above the cavity contour line (10) at the bottom of the karst cave hall in the shallow-buried section tunnel, a block stone layer and a crushed stone layer are successively provided, and the shallow-buried section tunnel is located above the crushed stone layer. Brick walls (56) are provided on both sides of the shallow-buried section tunnel, and a concrete slab (60) is provided at the upper end of the brick wall (56); A C10 concrete layer is provided below the concrete slab (60); A foamed concrete layer is provided above the concrete slab (60); It also includes a column supporting formwork system for constructing the columns (53).

2. The complex karst tunnel drainage and diversion composite filling construction system according to claim 1, characterized in that, An anchor shotcrete protection system is provided on the top of the karst cave hall in the shallow-buried section tunnel. The anchor shotcrete protection system includes anchor bolts (59) successively arranged along the cavity contour line on the top of the karst cave hall in the shallow-buried section tunnel, and the anchor bolts (59) are partially inserted into the rock mass.

3. The complex karst tunnel drainage and diversion composite filling construction system according to claim 1, characterized in that Grouting holes (63) and air vents (31) are drilled on the ground, and the grouting holes (63) and air vents (31) communicate with the karst cave hall in the shallow-buried section tunnel.

4. The complex karst tunnel drainage and diversion composite filling construction system according to claim 1, characterized in that, The column supporting formwork system includes a plugging plate (30), a special-shaped casing (38), an upper steel formwork (41), a lower steel formwork (48), and a fixing rod (45). The plugging plate (30) is arranged outside the karst cavity (7). Reinforcing bars (33) are welded on the upper and lower sides of the plugging plate (30). A grouting hole (34) and an air vent (31) are provided on the plugging plate (30). The plugging plate (30) is fixed to the rock mass by bolts (35). A special-shaped casing (38) is provided at the lower end of the plugging plate (30). A vibrating port (37) and a pumping port (39) are provided on the special-shaped casing (38); The lower end of the special-shaped casing (38) is provided with an upper steel formwork (41). The lower steel formwork (48) is provided below the upper steel formwork (41). Steel blocks (42) are welded on the upper steel formwork (41). The steel blocks (42) are welded on the outside of the upper steel formwork (41). Fixing holes (44) are provided on the steel blocks (42). The upper part of the fixing rod (45) is inserted into the fixing holes (44); The lower part of the fixing rod (45) is fixed on a self-standing hoop (50). The self-standing hoop (50) is arranged on the lower steel formwork (48). Triangular ear plates (46) are provided on the self-standing hoop (50). A telescopic rod (47) is provided at the bottom of the triangular ear plate (46). The lower end of the telescopic rod (47) is connected to a cross brace (52). The cross brace (52) is fixed on a concrete base (49). The lower end of the lower steel formwork (48) is fixedly arranged on the concrete base (49).

5. The complex karst tunnel drainage and diversion composite filling construction system according to claim 4, characterized in that, Ear plates (40) are welded on the special-shaped casing (38). The ear plates (40) are located on both sides of the special-shaped casing (38). Special-shaped steel bars (36) are implanted in the rock mass, and the special-shaped steel bars (36) are welded to the ear plates (40).

6. The water drainage and diversion composite filling construction system for complex karst tunnels according to claim 1, wherein A hoop (43) is provided on the steel block (42). The hoop (43) is arranged on the periphery of the steel block (42), and the hoop (43) clamps the steel block (42) tightly on the outer side of the upper steel formwork (41).

7. The water drainage and diversion composite filling construction system for complex karst tunnels according to claim 1, characterized in that, A flange (29) is provided at the tunnel entrance of the drainage branch tunnel (18). A hose (27) is arranged inside the flange (29). The flange (29) is fixed by an inclined support steel pipe (20) and a vertical support steel pipe (23). The inclined support steel pipe (20) and the vertical support steel pipe (23) are connected by a flexible connector (21). A cushion block (25) is provided at the bottom of the inclined support steel pipe (20) and the vertical support steel pipe (23).

8. The complex karst tunnel drainage and diversion composite filling construction system according to claim 7, characterized in that, An activity groove (26) is provided on the inclined support steel pipe (20) and the vertical support steel pipe (23). A connecting cross bar (24) is arranged between the inclined support steel pipe (20) and the vertical support steel pipe (23). The connecting cross bar (24) passes through the activity grooves (26) on the inclined support steel pipe (20) and the vertical support steel pipe (23) at the same time. The connecting cross bar (24) is fixedly connected with the inclined support steel pipe (20) and the vertical support steel pipe (23) by fixing bolts (22).

Images