CN217735486U - Composite pipeline system for long-distance conveying of cement slurry suitable for tunnel curtain grouting - Google Patents
Composite pipeline system for long-distance conveying of cement slurry suitable for tunnel curtain grouting Download PDFInfo
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- CN217735486U CN217735486U CN202220919490.5U CN202220919490U CN217735486U CN 217735486 U CN217735486 U CN 217735486U CN 202220919490 U CN202220919490 U CN 202220919490U CN 217735486 U CN217735486 U CN 217735486U
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Abstract
The utility model discloses a compound pipe-line system of long distance transport cement thick liquid suitable for tunnel curtain slip casting, include: 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 is used for conveying the stirred 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
Technical Field
The utility model belongs to the technical field of tunnel engineering construction and slip casting reinforcement, especially, relate to a composite pipe system of long distance transport cement thick liquid suitable for tunnel curtain slip casting.
Background
With the continuous extension of the traffic network in China to the southwest mountainous area, the encountered geological condition is continuously worsened, the stratum is reinforced and improved by using the curtain grouting technology, which becomes an important link which cannot be lost in underground engineering, and simultaneously, the burial depth and the length of the tunnel are obviously increased, which brings great challenges to the raw material supply of the curtain grouting work, especially to the tunnel engineering with a deep vertical shaft.
In curtain grouting construction, the total grouting amount of each grouting cycle is large. The longitudinal length of reinforcement in each cycle is about 20-30m, the cross section range of grouting reinforcement is 2-5m outside the excavation contour line, the reinforcement volume is large, and slurry is consumed by 300-1000m in each grouting cycle according to different conditions of the stratum and reinforcement requirements 3 The most common materials are cement grout which is far cheaper than other grouting materials, and the cement is required to be 240-800t per cycle, and 4800-16000 bags of cement are combined according to the common water cement ratio of 1.
Meanwhile, the curtain grouting construction has intermittent and non-quantitative requirements on materials, namely drilling, grouting, drilling a next hole, grouting, 8230, and the grouting amount of different drill holes is 0.5-100 m 3 The setting time of the cement prepared into the slurry is about 6 hours, and the slurry needs to be prepared in real time in small batches. Therefore, when the excavation surface is close to the opening, such as within 0.5km, the grouting machine can be arranged on the ground, grout is prepared according to the real-time demand, and then grouting is carried out remotely through the grouting pipe; when the distance between the excavation surface and the opening is far, the distance is more than 1km, the grouting machine is required to be arranged near the excavation surface, the cement materials are conveyed to the vicinity of the excavation surface through the transport vehicle, and the small stirring barrel is utilized to meet the requirements of gaps and variable real-time slurry.
Meanwhile, the pipeline is used for conveying slurry to the excavation face in a long distance, the contradiction of the diameter of the conveying speed pipeline, pipeline loss and residual slurry solidification is faced, and the slurry supply requirements of large total amount, quick conveying, intermittent small batch cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a composite pipe-line system of long distance transport cement thick liquid suitable for tunnel curtain slip casting, at the in-process of deep and long tunnel curtain slip casting construction, carry a large amount of thick liquids to the excavation face fast, in batches a little, avoided vehicle transportation and the regional manual stirring thick liquid of excavation face in the conventional construction, both can effectively improve slip casting efficiency of construction, can obviously improve the regional air circumstance of excavation face again.
The utility model adopts the following technical scheme: a composite piping system for long distance transport of cement grout suitable for tunnel curtain grouting, comprising: the water conveying pipeline, the slurry conveying pipeline and the air pressing pipeline are respectively provided with an independent inlet end and an independent outlet end; wherein:
the water conveying pipeline comprises a water conveying pipe, the water conveying pipe is a multi-section rigid pipe body which is sequentially connected in the axial direction, and the water conveying pipe 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 forms an annular channel with the water conveying pipeline; the inlet end of the slurry conveying pipe is used for being connected with a slurry conveying device pipeline and conveying the mixed cement slurry inside the slurry conveying pipe;
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, an annular channel is formed between the air pressing pipe and the slurry conveying pipe, the inlet end of the air pressing pipe is used for being connected with the air supply device pipeline, and the outlet end of the air pressing pipe is emptied;
one end of each section of elastic hose of the air pressing pipe is provided with an air control piece, and the air control piece is used for sealing each section of hose and controlling the flow direction of air;
the air compression pipe is used for: the air inlet end is used for conveying air, and the air inlet end is provided with a section of elastic hose and is sequentially conveyed to each section of elastic hose; and when the gas is conveyed to the hose section, the hose section expands to extrude the mixed cement slurry in the outer annular channel of the hose section, and the cement slurry is conveyed into the annular channel outside the adjacent lower hose section until the mixed cement slurry is conveyed to the excavation surface from the outlet end.
Furthermore, the end of each section of hose of the air compressing pipe is provided with a joint, the inner cavity of each joint is step-shaped, and the inner cavity close to the hose end is a small-diameter end.
Furthermore, the gas control part comprises an inflation one-way valve and an exhaust one-way valve, and the inflation one-way valve and the exhaust one-way valve are arranged at the small-diameter ends of the inner cavities of the adjacent two sections of hose connectors in parallel to separate each section of hose into an independent closed hose cavity.
Further, the slurry feed pipe is a weak elastic hose which can be expanded outward in its cross-sectional direction when feeding the slurry and can be contracted inward to be restored when not feeding the slurry.
Further, the air supply device is a high-pressure air tank, and the inlet of the high-pressure air tank is connected with an air compressor; the outlet end of the high-pressure gas tank is connected with the inlet of the gas compression pipe through a third connecting pipeline, an air inlet valve is installed on the third connecting pipeline, the third connecting pipeline is vertically connected with the gas compression pipe and is communicated with a starting point gas release pipe, and a starting point gas release valve is arranged on the starting point gas release pipe.
Furthermore, the outlet end of the air pressing pipe is communicated with an air outlet pipe, and a terminal air release valve is arranged on the air outlet pipe.
Furthermore, the inlet end of the water delivery pipe is connected with a water pump through a first pipeline, and a water inlet valve is arranged on the first pipeline; the outlet end of the water pipe is provided with a water outlet valve.
Furthermore, the inlet end of the slurry conveying pipe is connected with a slurry conveying pump through a second pipeline, and a slurry inlet valve is mounted on the second pipeline; the outlet end of the slurry conveying pipe is connected with a hard steel pipe, and a slurry valve is arranged on the hard steel pipe.
The utility model has the advantages that: 1. the air pressing pipe is matched with the slurry conveying pipe, so that slurry in the slurry conveying pipe is conveyed to the excavation surface intermittently, vehicle transportation is replaced, loading and unloading are not needed, and the efficiency is high, the speed is high, and the cost is low. 2. And mixing the slurry on the ground outside the tunnel instead of mixing the slurry near the excavation surface in the tunnel, thereby improving the operating environment in the tunnel.
Drawings
FIG. 1 is a schematic cross-sectional view of a composite piping system for long-distance transport of a cementitious slurry suitable for use in tunnel curtain grouting;
FIG. 2 is a schematic diagram of a composite piping system for long-distance transport of cement slurry suitable for use in tunnel curtain grouting;
FIG. 3 is a schematic view of a composite piping system coupling for long distance transport of cement grout suitable for use in tunnel curtain grouting;
FIG. 4 is a first schematic diagram of a composite piping system for long-distance transport of cement slurry suitable for tunnel curtain grouting;
FIG. 5 is a second schematic diagram of a composite piping system for long-distance transport of cement slurry suitable for tunnel curtain grouting;
FIG. 6 is a third schematic diagram of a composite piping system for long-distance transport of cement slurry suitable for tunnel curtain grouting;
FIG. 7 is a schematic diagram of an embodiment of a composite piping system for long distance transport of cement slurry suitable for use in tunnel curtain grouting;
wherein: 1. a water delivery pipeline; 2. a slurry conveying pipeline; 3. a gas pressurization pipeline; 4. a pulp storage tank;
11. a reservoir; 12. a water pump; 13. a water delivery pipe; 14. a water inlet valve; 15. a water outlet valve;
21. a slurry mixing station; 22. a slurry conveying pump; 23. a pulp conveying pipe; 24. a slurry inlet valve; 25. a slurry outlet valve;
31. a high pressure gas tank; 32. an air compressor; 33. pressing the air pipe; 34. an intake valve; 35-1, starting point air release valve; 35-2, a terminal air release valve; 36. an inflation check valve; 37. an exhaust check valve.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The utility model relates to a compound pipe-line system of long distance transport cement thick liquid suitable for tunnel curtain slip casting, as shown in figure 1, include: the water conveying pipeline 1, the slurry conveying pipeline 2 and the air pressing pipeline 3 are respectively provided with an independent inlet end and an independent outlet end; the length of the slurry pipeline 2 exceeds 2km, and the pipeline can hold about 22.6m 3 Slurries, if the single slurry feed is less than this value, in the absence of external forcesWhen the slurry is not discharged from the slurry outlet valve 25. Wherein:
the water conveying pipeline 1 comprises a water conveying pipe 13, the water conveying pipe is a multi-section rigid pipe body which is sequentially connected in the axial direction, and the water conveying pipe 13 is used for providing construction water for an excavation surface;
the slurry conveying pipeline 2 comprises a slurry conveying pipe 23, and the slurry conveying pipe 23 is a multi-section pipe body which is sequentially connected in the axial direction; the slurry conveying pipe 23 is coaxially sleeved in the water conveying pipe 13 and forms an annular channel with the water conveying pipeline 1; the inlet end of the slurry conveying pipe 23 is used for being connected with a slurry conveying device pipeline and conveying mixed cement slurry therein;
the air pressing pipeline 3 comprises an air pressing pipe 33, the air pressing pipe 33 is a multi-section elastic hose which is axially connected, the air pressing pipe 33 is coaxially sleeved in the pulp conveying pipe 23 and forms an annular channel with the pulp conveying pipe 23, the inlet end of the air pressing pipe 33 is used for being connected with an air supply device pipeline, and the outlet end of the air pressing pipe is emptied;
one end of each section of elastic hose of the air pressing pipe 33 is provided with an air control piece, and the air control piece is used for sealing each section of hose and controlling the flow direction of air;
the pneumatic tube 33 is used for: the air inlet is used for conveying air, and is sequentially conveyed to each section of elastic hose from one section of elastic hose at the inlet end; and when the gas is conveyed to the hose section, the hose section expands and extrudes the mixed cement slurry in the outer annular channel of the hose section, and the cement slurry is conveyed to the annular channel outside the adjacent lower hose section until the mixed cement slurry is conveyed to the excavation surface from the outlet end.
As a specific embodiment, the water pipe 13 is made of multiple seamless steel pipes, and the multiple seamless steel pipes are detachably connected in sequence in the axial direction, such as by screwing. Seamless steel tubes are used as supports for the slurry feed tube 23 and the gas compression tube 33. The diameter of the seamless steel pipe can be selected to be 150mm.
The pulp conveying pipe 23 is a high polymer material hose with weak elasticity and the diameter of 120mm.
The air pressing pipe 33 is a hose made of high polymer material, has high elasticity, has a diameter smaller than 5mm in an air-pressure-free contraction state, and can exceed 120mm in an air-pressure expansion state.
The lengths of the hard steel pipes, the multi-section pipe bodies and the elastic hoses are equal, for example, the lengths can be set to be 5m, so that the joints at corresponding positions are on the same section, and the pipes are conveniently connected and extended.
The end of each section of hose of the air compressing pipe 33 is provided with a joint, the inner cavity of each joint is step-shaped, and the inner cavity close to the end of the hose is a small-diameter end.
As shown in fig. 3, the gas control member includes an inflation check valve 36 and a deflation check valve 37, and the inflation check valve 36 and the deflation check valve 37 are installed in parallel at the small-diameter ends of the inner cavities of the adjacent two hose joints to separate the hose sections into independent closed hose chambers.
The slurry feed pipe 23 is a weak elastic hose, and is expanded outward in its cross-sectional direction when subjected to a force, and is contracted and restored inward when not subjected to a force.
As shown in fig. 2, the air supply device is a high-pressure air tank 31, and an inlet of the high-pressure air tank 31 is connected with an air compressor 32; the outlet end of the high-pressure air tank 31 is connected with the inlet of the air compressing pipe 33 through a third connecting pipeline, an air inlet valve 34 is installed on the third connecting pipeline, the third connecting pipeline is vertically connected and communicated with a starting point air release pipe, and a starting point air release valve 35-1 is arranged on the starting point air release pipe.
The outlet end of the air pressing pipe 33 is communicated with an air outlet pipe, and a terminal air release valve 35-2 is arranged on the air outlet pipe.
The inlet end of the water pipe 13 is connected with a water pump through a first pipeline, and a water inlet valve 14 is arranged on the first pipeline; the outlet end of the water pipe 13 is provided with a water outlet valve 15.
The inlet end of the pulp conveying pipe 23 is connected with the pulp conveying pump 22 through a second pipeline, and a pulp inlet valve 24 is arranged on the second pipeline; the outlet end of the pulp conveying pipe 23 is connected with a hard steel pipe, and a pulp valve 25 is arranged on the hard steel pipe.
The above-mentioned composite piping system for long-distance transportation of cement grout for tunnel curtain grouting, as shown in fig. 4, 5, 6 and 7, works as follows:
drilling, and when drilling, water pipeline 1 is to the working face water injection, specifically as follows:
the slurry inlet valve 24 and the air inlet valve 34 are closed, the slurry outlet valve 25, the starting point air escape valve 35-1 and the end point air escape valve 35-2 are opened, and the slurry conveying pipe 23 and the air pressing pipe 33 are in a contraction state;
the water inlet valve 14 is opened, water is conveyed to the water conveying pipe 13 through the first pipeline, and residual air in the pulp conveying pipe 23 and the air pressing pipe 33 is squeezed out;
the water outlet valve 15 is opened, and water flows out from the outlet end of the water delivery pipe 13 and is delivered to a drill hole on a working surface in construction;
step S11: grouting a drill hole, closing the water inlet valve 14 and the air inlet valve 34, opening the water outlet valve 15, and emptying water in the water conveying pipeline 1; opening the starting point air escape valve 35-1 and the end point air escape valve 35-2 to enable the air pressing pipe 3 to be in a contraction state in the cross section direction;
and (3) opening the air compressor 32 to fill the high-pressure air tank 31 with compressed air, and opening the air compressor 32 in real time for replenishing along with the batch consumption of the compressed air in subsequent operation if the air pressure is between 5 and 8 MPa.
After drilling, the following steps are carried out:
step S12: and stirring a batch of slurry at the stirring station 21, and after the slurry is stirred, opening the slurry conveying pump 22, the slurry inlet valve 24 and the slurry outlet valve 25 to completely inject the slurry into the second pipeline and convey the slurry to the slurry conveying pipe 23. The length of the slurry conveying pipe 23 exceeds 2km, the diameter reaches 120mm, the pipeline can accommodate about 22.6m3 slurry, and if the single slurry conveying amount is less than the value, no slurry flows out from the slurry outlet valve 25 at this time.
Step S13: the slurry conveying pump 22 and the slurry inlet valve 24 are closed, and the slurry outlet valve 25 is opened; the starting point air escape valve 35-1 is closed, and the end point air escape valve 35-2 is opened;
the air inlet 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 air compression pipe 33 from the air inlet valve 34; when the air pressure in the section of the elastic hose is increased, if the air pressure is increased to 0.1Mpa, the section of the elastic hose is expanded until the cross-sectional area is equal to that of the section of the pulp conveying pipe 23, and all the pulp in the pulp conveying pipe 23 is extruded to the pulp conveying pipe 23 at the adjacent lower section of the elastic hose;
continuously injecting compressed air into the section of the elastic hose of the air pressing pipe 3, wherein the air pressure is continuously increased and is limited by the diameter of the pulp conveying pipe 23 at the moment, and when the air pressure is greater than a set value, such as setting to be 0.2MPa, the air enters the adjacent lower section of the elastic hose through the inflating one-way valve 36, and the lower section of the elastic hose repeats the expansion process of the upper section of the elastic hose to extrude all the pulp in the pulp conveying pipe 23 to the pulp conveying pipe 23 at the adjacent lower section of the elastic hose; when the air pressure in the section of the elastic hose is larger than the set value, the air enters the adjacent lower section of the elastic hose through the inflation one-way valve 36, and the steps are repeated in sequence to finish the extrusion conveying of the slurry; in this process, the air pressure in the two adjacent sections of hoses is equal, so that the exhaust check valve 37 is in a closed state. After extrusion conveying of the slurry is completed, closing the end-point air escape valve 35-2 and stopping gas loss; meanwhile, the air inlet valve 34 is closed, and the air injection is stopped, and the air pressure of each section of hose is about 0.2MPa at the moment.
Step S14: the starting point air escape valve 35-1 is opened, air in a section of elastic hose at the inlet end of the air pressing pipe 3 is exhausted, the air pressure is reduced until the air pressure is 0MPa, and the section of elastic hose is contracted and restored; when the air pressure difference between the air in the adjacent lower section of elastic hose and the air in the upper section of elastic hose reaches a set value, for example, when the pressure difference is greater than 0.05MPa, the exhaust check valve 37 is opened, the air in the section of hose flows back to the upper section of elastic hose, and the air pressure is reduced; until the air in the whole air pressing pipe 3 is discharged; meanwhile, because the expansion pressure of each air pressure pipe is 0.1MPa and is 0.05MPa higher than the passing pressure of the exhaust one-way valve 37, the air in each hose is completely emptied finally under the action of the contraction force of the hose, and each hose is restored to the contraction state;
step S15: and (5) repeating the step (S11) to the step (S14), and discontinuously conveying the mixed cement slurry to the drill hole until the drill hole reaches the designed grouting.
Step S16: and (5) cleaning the slurry conveying pipeline 2, and repeating the step S11 to the step S15 to finish the slurry injection of all the drill holes.
The concrete process of cleaning the slurry conveying pipeline 2 is as follows:
closing the slurry inlet valve 24 and the slurry inlet valve 34, and opening the slurry outlet valve 25, the starting point air escape valve 35-1 and the end point air escape valve 35-2 to enable the slurry conveying pipeline 2 and the air pressing pipeline 3 to be in a contraction state;
injecting clear water into the mixing station, cleaning the mixing barrel, then repeating the operation of the step S12, injecting the cleaned water into the slurry conveying pipeline, and cleaning;
the water inlet valve 14 is opened, water fills the waterway channel in the composite pipeline under the action of pressure, and the pulp conveying pipeline 2 and the air pressing pipeline 3 are further extruded;
squeezing the cleaned residual water out of the pulp conveying pipeline by using a gas pressing pipe 33; the air in the compressed air pipeline is discharged.
Claims (8)
1. A composite piping system for long distance transport of cement slurry suitable for tunnel curtain grouting, comprising: the water conveying pipeline (1), the pulp conveying pipeline (2) and the air pressing pipeline (3) are respectively provided with an independent inlet end and an independent outlet end; wherein:
the water conveying pipeline (1) comprises a water conveying pipe (13), the water conveying pipe is a multi-section rigid pipe body which is sequentially connected in the axial direction, and the water conveying pipe (13) is used for providing construction water for an excavation surface;
the slurry conveying pipeline (2) comprises a slurry conveying pipe (23), and the slurry conveying pipe (23) is a multi-section pipe body which is sequentially connected in the axial direction; the slurry conveying pipe (23) is coaxially sleeved in the water conveying pipe (13) and forms an annular channel with the water conveying pipeline (1); the inlet end of the slurry conveying pipe (23) is connected with a slurry conveying device through a pipeline and used for conveying mixed cement slurry;
the air compression pipeline (3) comprises an air compression pipe (33), the air compression pipe (33) is a plurality of sections of elastic hoses which are axially connected, the air compression pipe is coaxially sleeved in the pulp conveying pipe (23), an annular channel is formed between the air compression pipe and the pulp conveying pipe (23), the inlet end of the air compression pipe (33) is used for being connected with an air supply device pipeline, and the outlet end of the air compression pipe is emptied;
one end of each section of elastic hose of the air pressing pipe (33) is provided with an air control piece, and the air control piece is used for closing each section of hose and controlling the flow direction of air;
the pneumatic tube (33) is used for: the air inlet is used for conveying air, and is sequentially conveyed to each section of elastic hose from one section of elastic hose at the inlet end; and when the gas is conveyed to the hose section, the hose section expands to extrude the mixed cement slurry in the outer annular channel of the hose section, and the cement slurry is conveyed into the annular channel outside the adjacent lower hose section until the mixed cement slurry is conveyed to the excavation surface from the outlet end.
2. A composite piping system for long distance transportation of cement grout for tunnel curtain grouting according to claim 1, wherein each end of each length of hose of said air pressing pipe (33) is provided with a joint, each joint inner cavity is step-shaped, and the inner cavity near the hose end is a small diameter end.
3. The composite piping system for transporting cement grout over a long distance for tunnel curtain grouting of claim 2, wherein the gas control means comprises an inflation check valve (36) and a deflation check valve (37), and the inflation check valve (36) and the deflation check valve (37) are installed in parallel at the small diameter ends of the inner cavities of the adjacent two hose joints to separate each hose into independent closed hose chambers.
4. A composite piping system for long distance transport of cement grout for tunnel curtain grouting according to claim 3, wherein said grout pipe (23) is a weak elastic hose which is expanded outwardly in its cross section direction when transporting grout and is contracted inwardly to be restored when not transporting grout.
5. The composite piping system for long distance transportation of cement grout for tunnel curtain grouting according to claim 4, wherein said gas supply means is a high pressure gas tank (31), and an inlet of said high pressure gas tank (31) is connected to an air compressor (32); the exit end of high-pressure gas jar (31) is connected with the import of air leg (33) through the third connecting tube install air inlet valve (34) on the third connecting tube is connected perpendicularly on the way, and is linked together and has the starting point air escape pipe, is provided with starting point air escape valve (35-1) on the starting point air escape pipe.
6. The composite piping system for long distance transportation of cement grout for tunnel curtain grouting of claim 5, wherein the outlet end of the air pressing pipe (33) is communicated with an air outlet pipe, and a terminal air release valve (35-2) is installed on the air outlet pipe.
7. The composite pipeline system for long-distance conveying of cement grout suitable for tunnel curtain grouting according to claim 6, wherein the inlet end of the water conveying pipe (13) is connected with a water pump through a first pipeline, and a water inlet valve (14) is arranged on the first pipeline; and a water outlet valve (15) is arranged at the outlet end of the water conveying pipe (13).
8. The composite piping system for long distance transportation of cement grout for tunnel curtain grouting of claim 7, wherein the inlet end of the grout pipe (23) is connected to the grout pump (22) through a second piping on which a grout inlet valve (24) is installed; the outlet end of the slurry conveying pipe (23) is connected with a hard steel pipe, and a slurry valve (25) is arranged on the hard steel pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220919490.5U CN217735486U (en) | 2022-04-14 | 2022-04-14 | Composite pipeline system for long-distance conveying of cement slurry suitable for tunnel curtain grouting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220919490.5U CN217735486U (en) | 2022-04-14 | 2022-04-14 | Composite pipeline system for long-distance conveying of cement slurry suitable for tunnel curtain grouting |
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| Publication Number | Publication Date |
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| CN217735486U true CN217735486U (en) | 2022-11-04 |
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| CN202220919490.5U Active CN217735486U (en) | 2022-04-14 | 2022-04-14 | Composite pipeline system for long-distance conveying of cement slurry suitable for tunnel curtain grouting |
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