CN114776307A - Composite pipeline system suitable for long-distance cement slurry conveying of tunnel curtain grouting and construction method - Google Patents

Abstract

The invention discloses a composite pipeline system and a construction method for long-distance conveying of cement slurry suitable for tunnel curtain grouting, wherein the composite pipeline system comprises the following components: a water conveying pipeline, a slurry conveying pipeline and a gas pressing pipeline; wherein: the water conveying pipeline comprises a water conveying pipe, and the water conveying pipe is a multi-section rigid pipe body which is sequentially connected in the axial direction and is used for providing construction water for an excavation surface; the slurry conveying pipeline comprises a slurry conveying pipe, and the slurry conveying pipe is a multi-section pipe body which is sequentially connected in the axial direction; the slurry conveying pipe is coaxially sleeved in the water conveying pipe and used for conveying the mixed cement slurry; the air pressing pipeline comprises an air pressing pipe, the air pressing pipe is a multi-section elastic hose which is axially connected, the air pressing pipe is coaxially sleeved in the slurry conveying pipe, and the inlet end of the air pressing pipe is used for being connected with the air supply device pipeline. By using the composite pipeline system, a large amount of grout is quickly conveyed to the excavation surface in small batches in the process of curtain grouting construction of the deep and long tunnel, so that vehicle transportation in construction and manual grout stirring in the area of the excavation surface are avoided.

Description

A composite pipeline system and construction method for long-distance transport of cement slurry suitable for tunnel curtain grouting

technical field

The invention belongs to the technical field of tunnel engineering construction and grouting reinforcement, and in particular relates to a composite pipeline system and a construction method suitable for long-distance cement slurry grouting for tunnel curtain grouting.

Background technique

With the continuous extension of my country's transportation network to the southwest mountainous area, the geological conditions encountered continue to deteriorate. The use of curtain grouting technology to strengthen and improve the stratum has become an indispensable and important part of underground engineering. At the same time, the buried depth and length of the tunnel have increased significantly. , which brings great challenges to the supply of raw materials for curtain grouting work, especially for tunnel projects with deep shafts.

In curtain grouting construction, the total amount of grouting per grouting cycle is large. The longitudinal length of each cycle of reinforcement is about 20-30m, and the cross-sectional range of grouting reinforcement is 2-5m outside the excavation contour line. 300-1000m ³ , of which the most commonly used material is cement slurry, which is much cheaper than other grouting materials. Calculated according to the commonly used water-cement ratio of 1:1, each cycle requires 240-800t of cement, which is 4800-16000 bags of cement.

At the same time, the demand for materials in curtain grouting construction is intermittent and non-quantitative, that is, "drilling - grouting - drilling a hole - grouting...", the grouting amount of different drilling holes is 0.5-100m ^3. After the cement is made into slurry, the setting time is about 6 hours, and the slurry needs to be prepared in small batches in real time. Therefore, when the excavation surface is relatively close to the hole, such as within 0.5km, the grouting machine can be arranged on the ground, the slurry can be prepared according to the real-time demand, and then the grouting can be carried out remotely through the grouting pipe; If the distance is more than 1km, the grouting machine must be arranged near the excavation surface, and the cement material must be transported to the vicinity of the excavation surface by a transport vehicle, and a small mixing bucket is used to meet the gap and indefinite real-time slurry requirements. This method involves A series of problems such as loading and unloading of cement materials, temporary stacking in tunnels, and manual mixing in tunnels have low efficiency and large dust. Especially in tunnel projects with deep shafts, the transportation of cement materials will further increase the cost.

At the same time, using the pipeline to transport the slurry to the excavation surface over a long distance faces the contradiction of "the diameter of the pipeline at the conveying speed - the loss of the pipeline and the solidification of the residual slurry", which cannot meet the requirements of "large total amount, fast transportation, intermittent small batch" pulp demand.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a composite pipeline system and construction method for long-distance transport of cement slurry suitable for tunnel curtain grouting. It is transported to the excavation surface, which avoids vehicle transportation in conventional construction and manual mixing of the slurry in the excavation surface area, which can not only effectively improve the grouting construction efficiency, but also significantly improve the air environment in the excavation surface area.

The present invention adopts the following technical scheme: a composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting, including: water delivery pipeline, slurry delivery pipeline and air pressure pipeline, all of which have independent inlets and outlets end; where:

The water delivery pipeline, including the water delivery pipeline, is a multi-section steel pipe body connected in sequence in the axial direction, and the water delivery pipeline is used to provide construction water to the excavation surface;

The slurry pipeline includes a slurry pipeline, which is a multi-section pipe body connected in sequence in the axial direction; the slurry pipeline is coaxially sleeved in the water pipeline to form an annular channel with the water pipeline; the slurry pipeline The inlet end is used to connect with the pipeline of the slurry conveying device, which is used to convey the mixed cement slurry;

The compressed air pipeline, including the compressed air pipe, is a multi-section axially connected elastic hose, which is coaxially sleeved in the slurry delivery pipe and forms an annular channel with the slurry delivery pipe. The inlet end of the compressed gas pipe is used for connecting with the air supply The device pipeline is connected, and its outlet end is emptied;

At one end of each elastic hose of the compressed gas pipe, a gas control part is arranged, and the gas control part is used to close each part of the hose and also to control the flow direction of the gas;

The compressed gas pipe is used for: it is used to transport gas, and starts from a section of elastic hose at the inlet end, and transports it to each section of elastic hose in sequence; and when the gas is transported to the section of the hose, the section of the hose expands outside. Expand, squeeze the mixed cement slurry in the outer annular channel of the hose, and transport the cement slurry to the annular channel outside the adjacent lower hose until the mixed cement slurry is transported from the outlet end. to the excavation surface.

Further, joints are provided at the ends of each hose section of the compressed air tube, the inner cavity of each joint is stepped, and the inner cavity close to the hose end is a small diameter end.

Further, the gas control part includes an inflation check valve and an exhaust check valve, and the inflation check valve and the exhaust check valve are installed side by side on the small diameter ends of the inner cavity of the adjacent two hose joints, and each section is connected. The hoses are isolated into individually closed hose chambers.

Further, the slurry delivery pipe is a weak elastic hose, which can expand outward in its cross-sectional direction when delivering slurry, and contract and recover inward when not delivering slurry.

Further, the air supply device is a high-pressure air tank, and the inlet of the high-pressure air tank is connected to the air compressor; the outlet end of the high-pressure air tank is connected to the inlet of the compressed air pipe through a third connecting pipeline, and the third connecting pipe An intake valve is installed on the road, which is vertically connected on the third connecting pipeline, and is connected with a starting point air discharge pipe, and a starting point air discharge valve is arranged on the starting point air discharge pipe.

Further, the outlet end of the compressed air pipe is communicated with the air outlet pipe, and the air outlet pipe is provided with a terminal air relief valve.

Further, the inlet end of the water delivery pipe is connected with the water pump through a first pipeline, and a water inlet valve is arranged on the first pipeline; the outlet end of the water delivery pipe is arranged with a water outlet valve.

Further, the inlet end of the slurry delivery pipe is connected with the slurry delivery pump through a second pipeline, and a slurry inlet valve is installed on the second pipeline; the outlet end of the slurry delivery pipe is connected with a hard pipe, which is arranged on the hard steel pipe. Slurry valve.

The invention also discloses a construction method of the above-mentioned composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting. The construction method is as follows:

Step S11: grouting a borehole, the water inlet valve 14 and the inlet valve 34 are closed, the water outlet valve 15 is opened, and the water in the water delivery pipeline is emptied; open the start gas relief valve 35-1 and the end gas relief valve 35-2;

Step S12: the slurry pump, the slurry inlet valve and the slurry outlet valve are opened, and all the slurry is injected into the slurry pipeline;

Step S13: the slurry pump 22 and the slurry inlet valve are closed, and the slurry outlet valve is opened; the start gas relief valve is closed, and the end gas relief valve is opened;

The intake valve is opened, and the compressed air in the high-pressure air tank enters a section of elastic hose at the inlet end of the compressed air pipe from the intake valve; the air pressure in this section of elastic hose rises and expands this section of elastic hose, Until the cross-sectional area is equal to the cross-sectional area of the slurry pipe, squeeze all the slurry in the slurry pipe to the slurry pipe at the adjacent lower elastic hose;

Compressed air is continuously injected into this elastic hose of the compressed air pipe, and when the air pressure is greater than the set value, the air enters the adjacent lower elastic hose through the inflation one-way valve, and the lower elastic hose repeats the elastic softness of the upper part. During the expansion process of the pipe, all the slurry in the slurry pipe is squeezed into the slurry pipe at the adjacent lower elastic hose; then when the air pressure in the elastic hose is greater than the set value, the air passes through the inflation The one-way valve enters the adjacent lower elastic hose, and repeats in turn to complete the extrusion and transportation of the slurry;

Step S14: the starting point deflation valve is opened, the air in a section of the elastic hose at the inlet end of the air pressure pipe is discharged, and the elastic hose of this section is contracted and restored; the air in the adjacent lower elastic hose is in a high pressure state, and is in a When the air pressure difference in the elastic hose section reaches the set value, the exhaust one-way valve opens, the gas in the compressed air pipe returns to the upper elastic hose, and the air pressure decreases; until the air in the entire compressed air pipe is discharged;

Step S15: Repeat steps S11 to S14, and intermittently transport the mixed cement slurry to the borehole until the borehole reaches the design grouting.

Step S16 : cleaning the grouting pipeline, repeating steps S11 to S15 to complete the grouting of all the boreholes.

Further, before step S11, it also includes drilling, and when drilling, the water delivery pipeline injects water into the working face, as follows:

The slurry inlet valve and the inlet valve are closed, the slurry outlet valve, the start gas relief valve and the end gas relief valve are opened, and the slurry delivery pipe and the gas compression pipe are in a contracted state;

The water inlet valve is opened, the water is transported from the first pipeline to the water delivery pipe, and the residual air in the slurry delivery pipe and the compressed air pipe is squeezed out;

The water outlet valve is opened, and the water flows out from the outlet end of the water pipe, and is transported to the drilling hole in the working face.

The beneficial effects of the present invention are as follows: 1. The air compression pipe is matched with the slurry pipe, so that the slurry in the slurry pipe is intermittently transported to the excavation surface, instead of vehicle transportation, and does not need to be loaded and unloaded, with high efficiency, high speed and low cost. . 2. Mix the slurry on the ground outside the tunnel, instead of mixing the slurry near the excavation surface in the tunnel, so as to improve the working environment in the tunnel.

Description of drawings

Fig. 1 is a kind of cross-sectional schematic diagram of a composite pipeline system suitable for long-distance transport of cement slurry in tunnel curtain grouting;

2 is a schematic diagram of a composite pipeline system for long-distance transport of cement slurry suitable for tunnel curtain grouting;

Fig. 3 is a kind of composite pipeline system pipe joint connection schematic diagram for long-distance transport of cement slurry suitable for tunnel curtain grouting;

Fig. 4 is a working schematic diagram 1 of a composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting;

Fig. 5 is a working schematic diagram 2 of a composite pipeline system for long-distance transport of cement slurry suitable for tunnel curtain grouting;

Fig. 6 is a working schematic diagram 3 of a composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting;

7 is a schematic diagram of the implementation of a composite pipeline system for long-distance transport of cement slurry suitable for tunnel curtain grouting;

Among them: 1. Water pipeline; 2. Slurry pipeline; 3. Compression pipeline; 4. Slurry storage tank;

11. Reservoir; 12. Water pump; 13. Water pipe; 14. Inlet valve; 15. Outlet valve;

21. Slurry mixing station; 22. Slurry pump; 23. Slurry pipe; 24. Slurry inlet valve; 25. Slurry outlet valve;

31. High pressure air tank; 32. Air compressor; 33. Air pressure pipe; 34. Inlet valve; one-way valve.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The present invention is a composite pipeline system suitable for long-distance cement slurry grouting for tunnel curtain grouting, as shown in FIG. Inlet and outlet; the length of slurry pipeline 2 is more than 2km, and the pipeline can accommodate about ^22.6m3 slurry. If the single slurry delivery volume is less than this value, when there is no external force, the slurry valve 25 will be temporarily at this time. No slurry flowed out. in:

The water delivery pipeline 1 includes a water delivery pipeline 13, which is a multi-section steel pipe body connected in sequence in the axial direction, and the water delivery pipeline 13 is used to provide construction water to the excavation surface;

The slurry pipeline 2 includes a slurry pipeline 23, which is a multi-section pipe body connected in sequence in the axial direction; The inlet end of the slurry conveying pipe 23 is used for connecting with the pipeline of the slurry conveying device, which is used for conveying the mixed cement slurry;

The compressed air pipeline 3 includes a compressed air pipe 33, which is a multi-section axially connected elastic hose, and is coaxially sleeved in the slurry delivery pipe 23 to form an annular channel with the slurry delivery pipe 23. The inlet end is used to connect with the pipeline of the air supply device, and the outlet end is emptied;

At one end of each elastic hose of the compressed gas pipe 33, a gas control member is provided, and the gas control member is used to close each section of the hose and also to control the flow direction of the gas;

The compressed gas pipe 33 is used for: it is used to transport gas, and starts from a section of elastic hose at the inlet end, and is transported to each section of elastic hose in sequence; and when the gas is transported to the section of the hose, the section of the hose expands Expand outward, squeeze the mixed cement slurry in the outer annular channel of the hose, and transport the cement slurry to the annular channel outside the adjacent lower hose until the mixed cement slurry is discharged from the outlet end. delivered to the excavation surface.

As a specific embodiment, the above-mentioned water delivery pipe 13 is made of multi-segment seamless steel pipes, and the multi-segments of seamless steel pipes are sequentially detachably connected in the axial direction, such as threaded connections. The seamless steel pipe is used as the support for the slurry feeding pipe 23 and the compressed air pipe 33 . The diameter of seamless steel pipe can be 150mm.

Slurry pipe 23 Polymer material hose, weak elasticity, diameter is 120mm.

The above-mentioned air pressure tube 33 is a high-molecular material hose with high elasticity, and its diameter is less than 5 mm in a non-air pressure contraction state, and its diameter can exceed 120 mm in an air pressure expansion state.

The lengths of the above-mentioned sections of rigid steel pipes, multi-section pipe bodies and elastic hoses are equal, for example, can be set to 5m, so that the joints at the corresponding positions are in the same section, which is convenient for connecting and extending each pipe.

The ends of each hose section of the air pressure pipe 33 are provided with joints, the inner cavity of each joint is stepped, and the inner cavity close to the hose end is a small diameter end.

As shown in FIG. 3 , the above-mentioned gas control member includes an inflation check valve 36 and an exhaust check valve 37, and the inflation check valve 36 and the exhaust check valve 37 are installed side by side in the inner cavity of the adjacent two hose joints. The small diameter end isolates each section of the hose into a separate closed hose chamber.

The above-mentioned slurry pipe 23 is a weak elastic hose, which can expand outward in the direction of its cross-section when it is stressed, and contract and recover inward when it is not stressed.

As shown in FIG. 2 , the air supply device is a high-pressure air tank 31, and the inlet of the high-pressure air tank 31 is connected to the air compressor 32; For connection, an intake valve 34 is installed on the third connecting pipeline, which is vertically connected on the third connecting pipeline, and is connected with a starting point exhaust pipe, and a starting point exhaust valve 35-1 is arranged on the starting point exhaust pipe.

The outlet end of the air pressure pipe 33 is communicated with the air outlet pipe, and the air outlet pipe is provided with a terminal air relief valve 35-2.

The inlet end of the water delivery pipe 13 is connected with the water pump through a first pipeline, and a water inlet valve 14 is arranged on the first pipeline; the outlet end of the water delivery pipe 13 is arranged with a water outlet valve 15 .

The inlet end of the slurry delivery pipe 23 is connected with the slurry delivery pump 22 through a second pipeline, and a slurry inlet valve 24 is installed on the second pipeline; the outlet end of the slurry delivery pipe 23 is connected with a hard steel pipe, which is arranged on the hard steel pipe. Slurry valve 25.

The above-mentioned construction method of a composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting is shown in Figures 4, 5, 6 and 7, and the construction method is as follows:

Drilling holes, and when drilling, the water delivery pipeline 1 injects water into the working face, as follows:

The slurry inlet valve 24 and the inlet valve 34 are closed, the slurry outlet valve 25, the start gas relief valve 35-1 and the end gas relief valve 35-2 are opened, and the slurry delivery pipe 23 and the air pressure pipe 33 are in a contracted state;

The water inlet valve 14 is opened, and the water is transported from the first pipeline to the water delivery pipe 13, and the residual air in the slurry delivery pipe 23 and the compressed air pipe 33 is squeezed out;

The water outlet valve 15 is opened, and the water flows out from the outlet end of the water delivery pipe 13, and is transported to the drilling hole in the construction of the working face;

Step S11: grouting a borehole, close the water inlet valve 14 and the air inlet valve 34, open the water outlet valve 15, and empty the water in the water delivery pipeline 1; open the start gas relief valve 35-1 and the end gas relief valve 35-2 , so that the compressed air tube 3 is in a contracted state in the cross-sectional direction;

Turn on the air compressor 32 to fill the high-pressure air tank 31 with compressed air. If the air pressure is between 5-8 MPa, the air compressor 32 will be turned on in real time for replenishment with subsequent operations that consume compressed air in batches.

After drilling, proceed as follows:

Step S11: grouting a borehole, close the water inlet valve 14 and the air inlet valve 34, open the water outlet valve 15, and empty the water in the water delivery pipeline 1; open the start gas relief valve 35-1 and the end gas relief valve 35-2 , so that the compressed air tube 3 is in a contracted state in the cross-sectional direction;

Turn on the air compressor 32, so that the high-pressure air tank 31 is filled with compressed air, if the air pressure is between 5-8MPa, and the compressed air is consumed in batches with subsequent operations, the air compressor 32 is turned on in real time for replenishment;

Step S12: A batch of slurry is mixed in the mixing station 21. After the slurry is mixed, the slurry pump 22, the slurry inlet valve 24 and the slurry outlet valve 25 are opened, and all the slurry is injected into the second pipeline and transported to the slurry pipeline 23. The length of the slurry delivery pipe 23 is more than 2km and the diameter is 120mm. The pipeline can accommodate about 22.6m3 of slurry. If the single delivery volume is less than this value, there will be no slurry flowing out of the slurry valve 25 at this time.

Step S13: the slurry pump 22 and the slurry inlet valve 24 are closed, and the slurry outlet valve 25 is opened; the start gas relief valve 35-1 is closed, and the end gas relief valve 35-2 is opened;

The intake valve 34 is opened, and the compressed air in the high-pressure air tank 31 enters a section of elastic hose at the inlet end of the compressed air pipe 33 from the intake valve 34; the air pressure in the elastic hose increases, for example, the air pressure rises to At 0.1Mpa, expand the elastic hose until the cross-sectional area is equal to the cross-sectional area of the slurry pipe 23, and squeeze all the slurry in the slurry pipe 23 to the adjacent lower elastic hose. Slurry pipe 23 at

Compressed air is continuously injected into the elastic hose of the compressed air pipe 3, and the air pressure is continuously increased. At this time, it is limited by the diameter of the slurry pipe 23, and when the air pressure is greater than the set value, such as setting it to 0.2MPa, the air passes through the inflation The one-way valve 36 enters the adjacent lower elastic hose, the lower elastic hose repeats the expansion process of the upper elastic hose, and all the slurry in the slurry pipe 23 is squeezed to the adjacent lower elastic hose. In the slurry pipe 23 at the hose; when the air pressure in this elastic hose is greater than the set value, the air enters the adjacent lower elastic hose through the inflation check valve 36, and repeats in turn to complete the extrusion and transportation of the slurry ; During this process, the air pressure in the adjacent two hoses is equal, so the exhaust one-way valve 37 is in a closed state. After the slurry is squeezed and conveyed, close the exhaust valve 35-2 at the end to stop gas loss; at the same time, close the intake valve 34 to stop gas injection. At this time, the air pressure of each hose is about 0.2MPa.

Step S14: the starting point air relief valve 35-1 is opened, the air in a section of the elastic hose at the inlet end of the compressed air pipe 3 is discharged, the air pressure is reduced to 0 MPa, and the elastic hose of this section is contracted and restored; The air is in a high pressure state, and when the pressure difference with the air in the upper elastic hose reaches the set value, for example, when the pressure difference is greater than 0.05MPa, the exhaust check valve 37 is opened, and the air in this hose returns to the upper part. When the elastic hose is cut, the air pressure is reduced; until the discharge of the air in the entire compressed air pipe 3 is completed; at the same time, since the expansion pressure of each compressed air pipe is 0.1 MPa, which is higher than the passing pressure of the exhaust check valve 37 by 0.05 MPa, so the final pressure is 0.05 MPa. Under the action of the contraction force of the hose itself, the air in each section of the hose is completely emptied, and each section of the hose returns to the contracted state;

Step S15: Repeat steps S11 to S14, and intermittently transport the mixed cement slurry to the borehole until the borehole reaches the design grouting.

Step S16: Clean the grouting pipeline 2, and repeat steps S11 to S15 to complete the grouting of all the boreholes.

The specific process of cleaning the slurry pipeline 2 is as follows:

Close the slurry inlet valve 24 and the inlet valve 34, and open the slurry outlet valve 25, the start gas relief valve 35-1 and the end gas relief valve 35-2, so that the slurry feeding pipeline 2 and the air pressure pipeline 3 are in a contracted state;

Inject clean water into the mixing station to clean the mixing tank, and then repeat the operation of step S12, and inject the cleaned water into the slurry pipeline for cleaning;

Open the water inlet valve 14, the water fills the water channel in the composite pipeline under the action of pressure, and further extrudes the slurry feeding pipeline 2 and the air pressure pipeline 3;

Use the compressed air pipe 33 to squeeze out the residual water after cleaning from the slurry feeding pipeline; discharge the air in the compressed air pipeline.

Claims (10)

1. a composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting, is characterized in that, comprising: water delivery pipeline (1), slurry delivery pipeline (2) and compressed air pipeline (3), have independent inlet and outlet ports; where: The water delivery pipeline (1) includes a water delivery pipe (13), the water delivery pipe is a multi-section steel pipe body connected in sequence in the axial direction, and the water delivery pipe (13) is used to provide construction water to the excavation surface ; The slurry delivery pipeline (2) includes a slurry delivery pipe (23), wherein the slurry delivery pipe (23) is a multi-section pipe body connected in sequence in the axial direction; the slurry delivery pipe (23) is coaxially sleeved In the water delivery pipe (13), an annular channel is formed with the water delivery pipeline (1); the inlet end of the slurry delivery pipe (23) is used for connecting with the pipeline of the slurry delivery device, and the inside is used for Conveying the mixed cement slurry; The compressed air pipeline (3) includes a compressed air pipe (33), the compressed air pipe (33) is a multi-section axially connected elastic hose, and is coaxially sleeved in the slurry delivery pipe (23), An annular channel is formed with the slurry delivery pipe (23), the inlet end of the air compression pipe (33) is used for connecting with the pipeline of the air supply device, and the outlet end thereof is emptied; A gas control member is provided at one end of each elastic hose of the gas pressure pipe (33), and the gas control member is used to close each hose and also to control the flow direction of the gas; The compressed gas pipe (33) is used for: it is used to transport gas, and starts from a section of elastic hose at the inlet end, and is transported to each section of elastic hose in sequence; and when the gas is transported to the section of the hose, the The hose expands and expands outward, squeezes the mixed cement slurry in the outer annular channel of the hose, and transports the cement slurry to the annular channel outside the adjacent lower hose until the mixing is completed. The cement slurry is transported to the excavation surface from the outlet end. 2. A composite pipeline system suitable for long-distance conveying of cement slurry for tunnel curtain grouting as claimed in claim 1, characterized in that the ends of each section of the hose of the air pressure pipe (33) are provided with There are joints, the inner cavity of each joint is stepped, and the inner cavity near the end of the hose is the small diameter end. 3. A composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting according to claim 2, characterized in that, the gas control member comprises an inflation check valve (36) and an exhaust check valve. The direction valve (37), the inflation check valve (36) and the exhaust check valve (37) are installed side by side on the small-diameter ends of the inner cavity of the two adjacent hose joints, isolating each hose into an independent Closed hose chamber. 4. A composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting according to claim 3, characterized in that, the slurry pipe (23) is a weak elastic hose, which is used for transporting the slurry It can expand outward in its cross-sectional direction and contract inward to recover when no slurry is transported. 5. A composite pipeline system suitable for long-distance transportation of cement slurry for tunnel curtain grouting according to claim 4, characterized in that the gas supply device is a high-pressure gas tank (31), and the high-pressure gas The inlet of the tank (31) is connected to the air compressor (32); the outlet end of the high-pressure air tank (31) is connected to the inlet of the compressed air pipe (33) through a third connection pipeline, and An intake valve (34) is installed on the connecting pipeline, which is vertically connected on the third connecting pipeline, and is connected with a starting point air discharge pipe, and a starting point air discharge valve (35-1) is arranged on the starting point air discharge pipe. 6. A composite pipeline system suitable for long-distance transportation of cement slurry for tunnel curtain grouting according to claim 5, characterized in that the outlet end of the compressed air pipe (33) is communicated with the air outlet pipe, so that the The end exhaust valve (35-2) is installed on the air outlet pipe. 7. A composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting as claimed in claim 6, wherein the inlet end of the water delivery pipe (13) and the water pump pass through the first pipeline A water inlet valve (14) is arranged on the first pipeline; a water outlet valve (15) is arranged at the outlet end of the water delivery pipe (13). 8. A composite pipeline system suitable for long-distance transport of cement slurry for tunnel curtain grouting as claimed in claim 7, characterized in that the inlet end of the slurry pipe (23) is connected to the slurry pump (22). ) are connected through a second pipeline, and a slurry inlet valve (24) is installed on the second pipeline; the outlet end of the slurry pipeline (23) is connected with a hard tube, and the hard steel pipe is provided with a Slurry valve (25). 9. the construction method of a kind of composite pipeline system that is applicable to the long-distance conveying cement grout of tunnel curtain grouting as described in any one of claim 1-8, is characterized in that, this construction method is as follows: Step S11: grouting a borehole, the water inlet valve 14 and the inlet valve 34 are closed, the water outlet valve 15 is opened, and the water in the water delivery pipeline (1) is emptied; open the start gas relief valve 35-1 and the end gas relief valve 35 -2; Step S12: the slurry pump (22), the slurry inlet valve (24) and the slurry outlet valve (25) are opened, and all the slurry is injected into the slurry delivery pipeline (2); Step S13: the slurry pump 22 and the slurry inlet valve (24) are closed, and the slurry outlet valve (25) is opened; the start gas relief valve (35-1) is closed, and the end gas relief valve (35-2) is opened; The intake valve (34) is opened, and the compressed air in the high-pressure air tank (31) enters a section of elastic hose at the inlet end of the compressed air pipe (33) from the intake valve (34); the air pressure in the elastic hose Elevate and expand the elastic hose until the cross-sectional area is equal to the cross-sectional area of the slurry pipe (23), and squeeze all the slurry in the slurry pipe (23) to the adjacent lower part. Slurry pipe (23) at the elastic hose section; Compressed air is continuously injected into this elastic hose of the air compression pipe (3), and when the air pressure is greater than the set value, the air enters the adjacent lower elastic hose through the inflation check valve (36), and the lower elastic is soft The pipe repeats the expansion process of the upper elastic hose, and squeezes all the slurry in the slurry pipe (23) into the slurry pipe (23) at the adjacent lower elastic hose; then the elasticity of this section is soft. When the air pressure in the pipe is greater than the set value, the air enters the adjacent lower elastic hose through the inflation check valve (36), and repeats in sequence to complete the extrusion and transportation of the slurry; Step S14: the starting point deflation valve (35-1) is opened, the air in a section of the elastic hose at the inlet end of the compressed air pipe (3) is discharged, and the elastic hose of this section is contracted and restored; the air in the adjacent lower elastic hose is In the high pressure state, and when the air pressure difference from the upper elastic hose reaches the set value, the exhaust check valve (37) is opened, the gas in the compressed air pipe returns to the upper elastic hose, and the air pressure decreases; until the completion The discharge of air in the entire compressed air pipe (3); Step S15: Repeat steps S11 to S14, and intermittently transport the mixed cement slurry to the borehole until the borehole reaches the design grouting. Step S16: Clean the grouting pipeline (2), repeat steps S11 to S15, and complete the grouting of all the boreholes. 10. The construction method of a composite pipeline system for long-distance transport of cement slurry suitable for tunnel curtain grouting according to claim 9, characterized in that, before the step S11, further comprising drilling, and in When drilling, the water delivery pipeline (1) injects water into the working face, as follows: The slurry inlet valve (24) and the inlet valve (34) are closed, the slurry outlet valve (25), the start gas relief valve (35-1) and the end gas relief valve (35-2) are opened, and the slurry delivery pipe (23) and the gas pressure pipe are opened. (33) in a contracted state; The water inlet valve (14) is opened, the water is transported from the first pipeline to the water delivery pipe (13), and the residual air in the slurry delivery pipe (23) and the compressed air pipe (33) is squeezed out; The water outlet valve (15) is opened, and the water flows out from the outlet end of the water conveying pipe (13), and is transported to the drilling hole under construction on the working face.

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