CN114776307A - Composite pipeline system suitable for long-distance cement slurry conveying of tunnel curtain grouting and construction method - Google Patents
Composite pipeline system suitable for long-distance cement slurry conveying of tunnel curtain grouting and construction method Download PDFInfo
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- CN114776307A CN114776307A CN202210392784.1A CN202210392784A CN114776307A CN 114776307 A CN114776307 A CN 114776307A CN 202210392784 A CN202210392784 A CN 202210392784A CN 114776307 A CN114776307 A CN 114776307A
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- 239000002002 slurry Substances 0.000 title claims abstract description 146
- 239000004568 cement Substances 0.000 title claims abstract description 46
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 96
- 238000003825 pressing Methods 0.000 claims abstract description 60
- 239000011440 grout Substances 0.000 claims abstract description 26
- 238000009412 basement excavation Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000005553 drilling Methods 0.000 claims description 11
- 230000008602 contraction Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims 1
- 238000003756 stirring Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 239000002861 polymer material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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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
Technical Field
The invention belongs to the technical field of tunnel engineering construction and grouting reinforcement, and particularly relates to a composite pipeline system for long-distance cement slurry conveying and a construction method, which are suitable for tunnel curtain grouting.
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. Which reinforces the longitudinal direction per cycleThe length is about 20-30m, the grouting reinforcement cross section range is 2-5m outside the excavation contour line, the reinforcement amount is large, and according to different self conditions of the stratum and reinforcement requirements, 300-1000m slurry is consumed in each grouting circulation3The most common material is cement slurry which is far cheaper than other grouting materials, and the cement is required to be used in 800t per cycle and is required to be used in 16000 bags of cement in 4800 bags according to the common water-cement ratio of 1: 1.
Meanwhile, the curtain grouting construction has intermittent and non-quantitative requirements on materials, namely 'drilling, grouting, drilling a next hole and grouting …', and the grouting amount of different drilling holes is 0.5-100 m3The 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 distance between the excavation surface and the opening is close, for example, within 0.5km, the grouting machine can be arranged on the ground, slurry 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.
Disclosure of Invention
The invention aims to provide a composite pipeline system and a construction method for long-distance conveying of cement grout, which are suitable for grouting of a tunnel curtain.
The invention 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 pulp conveying pipe, an annular channel is formed between the air pressing pipe and the pulp conveying pipe, the inlet end of the air pressing pipe is used for being connected with the pipeline of the air supply device, 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 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.
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 end of the hose 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 expand outward in the cross-sectional direction thereof when feeding the slurry and contract inward to recover 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 air pressing pipe through a third connecting pipeline, an air inlet valve is installed on the third connecting pipeline, the third connecting pipeline is vertically connected, the starting point air leakage pipe is communicated, and the starting point air leakage valve is arranged on the starting point air leakage 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 delivery 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 arranged on the second pipeline; the outlet end of the slurry conveying pipe is connected with a hard pipe, and a slurry valve is arranged on the hard steel pipe.
The invention also discloses a construction method of the composite pipeline system for long-distance conveying of cement slurry, which is suitable for tunnel curtain grouting, and the construction method comprises the following steps:
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; opening a starting point air escape valve 35-1 and a terminal point air escape valve 35-2;
step S12: opening the slurry conveying pump, the slurry inlet valve and the slurry outlet valve, and completely injecting the slurry into the slurry conveying pipeline;
step S13: the slurry conveying pump 22 and the slurry inlet valve are closed, and the slurry outlet valve is opened; the starting point air escape valve is closed, and the end point air escape valve is opened;
the air inlet valve is opened, and compressed air in the high-pressure air tank enters a section of elastic hose at the inlet end of the air compression pipe from the air inlet valve; the air pressure in the section of the elastic hose is increased, the section of the elastic hose is expanded until the cross section area is equal to that of the section of the pulp conveying pipe, and all pulp in the pulp conveying pipe is extruded to the pulp conveying pipe 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, and when the air pressure is greater than a set value, allowing the air to enter the adjacent lower section of the elastic hose through the inflation one-way valve, repeating the expansion process of the upper section of the elastic hose by the lower section of the elastic hose, and completely extruding the grout in the grout conveying pipe to the grout conveying pipe at the adjacent lower section of the elastic hose; when the air pressure in the section of the elastic hose is larger than a set value, air enters the adjacent lower section of the elastic hose through the inflation one-way valve, and the steps are repeated in sequence to finish the extrusion conveying of the slurry;
step S14: the starting point air escape valve is opened, air in a section of elastic hose at the inlet end of the air pressing pipe is exhausted, and the section of elastic hose is contracted and restored; the air in the adjacent lower section of elastic hose is in a high-pressure state, and 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, the exhaust check valve is opened, the air in the air-saving pipe flows back to the upper section of elastic hose, and the air pressure is reduced; until the air in the whole air compressing pipe is discharged;
step S15: and 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 cleaning the slurry conveying pipeline, and repeating the steps S11-S15 to finish the slurry injection of all the drill holes.
Further, before step S11, still include the drilling, and when drilling, water pipe way is to the working face water injection, specifically as follows:
the slurry inlet valve and the slurry inlet valve are closed, the slurry outlet valve, the starting point air escape valve and the end point air escape valve are opened, and the slurry conveying pipe and the air pressing pipe are in a contraction state;
the water inlet valve is opened, water is conveyed to the water conveying pipe through the first pipeline, and residual air in the pulp conveying pipe and the air pressing pipe is extruded;
and opening the water outlet valve, and conveying the water flowing out of the outlet end of the water pipe to the drill hole on the working surface in construction.
The beneficial effects of the invention are: 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 cement slurry suitable for use in tunnel curtain grouting;
FIG. 2 is a schematic view 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 slurry suitable for use in tunnel curtain grouting;
FIG. 4 is a first schematic diagram of a composite piping system for long distance transport of a cementitious slurry suitable for use in 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 a cementitious slurry suitable for use in 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 below with reference to the accompanying drawings and specific embodiments.
The invention relates to a composite pipeline system for long-distance conveying of cement grout, which is suitable for tunnel curtain grouting, and as shown in figure 1, the composite pipeline system comprises: 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; the length of the slurry conveying pipeline 2 exceeds 2km, and the pipeline can accommodate about 22.6m3If the single slurry conveying amount is less than the value, when no external force is applied, no slurry flows out of the slurry outlet valve 25 temporarily. 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 flexible pipe which is axially connected, the air pressing pipe is coaxially sleeved in the pulp conveying pipe 23, an annular channel is formed between the air pressing pipe and the pulp conveying pipe 23, the inlet end of the air pressing pipe 33 is 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 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.
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 150 mm.
The pulp conveying pipe 23 is a high polymer material hose with weak elasticity and the diameter of 120 mm.
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 figure 3, the gas control component comprises an inflation one-way valve 36 and a discharge one-way valve 37, wherein the inflation one-way valve 36 and the discharge one-way valve 37 are arranged at the small-diameter ends of the inner cavities of the joints of the two adjacent sections of hoses in parallel to separate the hose sections into independent closed hose cavities.
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 delivery 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 delivery pipe 13 is provided with a water outlet valve 15.
The inlet end of the slurry conveying pipe 23 is connected with the slurry conveying pump 22 through a second pipeline, and a slurry inlet valve 24 is arranged on the second pipeline; 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.
The construction method of the composite pipeline system for long-distance cement slurry transportation suitable for tunnel curtain grouting, as shown in fig. 4, 5, 6 and 7, comprises the following steps:
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 the drill hole on the working surface for 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 to supplement the compressed air when the air pressure is between 5 and 8MPa and the compressed air is consumed in batches along with the subsequent operation.
After drilling, the following steps are carried out:
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;
the air compressor 32 is started to fill the high-pressure air tank 31 with compressed air, if the air pressure is between 5 and 8MPa, the air compressor 32 is started in real time to supplement the compressed air when the compressed air is consumed in batches in subsequent operations;
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 slurry pipe 23 has a length of more than 2km and a diameter of 120mm, and can accommodate about 22.6m3 slurry, if the single slurry amount is less than this value, no slurry will flow out from the slurry outlet valve 25.
Step S13: the pulp conveying pump 22 and the pulp inlet valve 24 are closed, and the pulp 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, for example, 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 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 completely extrude 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 the exhaust check valve 37 is in a closed state. After the extrusion conveying of the slurry is finished, closing the end point air escape valve 35-2 and stopping the 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, the 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 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 steps S11-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 clean water into the stirring station, cleaning the stirring barrel, then repeating the operation of the step S12, and injecting the cleaned water into the slurry conveying pipeline for 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;
the residual water after cleaning is extruded out from the pulp conveying pipeline by using the air pressing pipe 33; the air in the compressed air pipeline is discharged.
Claims (10)
1. A composite piping system for long distance transport of cement grout 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 pressing pipeline (3) comprises an air pressing pipe (33), the air pressing pipe (33) is a plurality of sections of elastic hoses which are axially connected, the air pressing pipe is coaxially sleeved in the pulp conveying pipe (23), an annular channel is formed between the air pressing pipe and the pulp conveying pipe (23), the inlet end of the air pressing pipe (33) is 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 closing each section of hose and controlling the flow direction of air;
the pneumatic tube (33) 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.
2. A composite piping system for long distance transport of cement grout for tunnel curtain grouting according to claim 1, characterized in that the ends of each hose of said air compressing pipe (33) are provided with joints, the inner cavity of each joint is stepped and the inner cavity near the hose end is a small diameter end.
3. A composite piping system for long distance transportation of cement grout for tunnel curtain grouting according to claim 2, wherein said gas control means comprises an inflation check valve (36) and a deflation check valve (37), said inflation check valve (36) and deflation check valve (37) being installed in parallel at the small diameter ends of the inner cavities of the adjacent hose joints to separate each hose into independent closed hose chambers.
4. A composite piping system for long distance transportation of cement grout for tunnel curtain grouting of claim 3, wherein the grout pipe (23) is a weak elastic hose capable of expanding outward in a cross sectional direction thereof when transporting grout and contracting inward to recover 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 the air supply device is a high pressure air tank (31), and the inlet of the high pressure air tank (31) is connected with 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 delivery 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 pulp conveying pipe (23) is connected with a hard pipe, and a pulp valve (25) is arranged on the hard pipe.
9. The construction method of the composite pipeline system for long-distance conveying of cement grout for tunnel curtain grouting according to any one of claims 1 to 8, is characterized by comprising the following steps:
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 a starting point air escape valve 35-1 and a terminal point air escape valve 35-2;
step S12: opening a slurry conveying pump (22), a slurry inlet valve (24) and a slurry outlet valve (25), and completely injecting slurry into the slurry conveying pipeline (2);
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 compressed air in the high-pressure air tank (31) enters a section of elastic hose at the inlet end of the air pressing pipe (33) from the air inlet valve (34); the air pressure in the section of the elastic hose is increased, the section of the elastic hose is expanded until the cross section area is equal to that of the section of the pulp conveying pipe (23), and all 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), and when the air pressure is greater than a set value, enabling the air to enter the adjacent lower section of the elastic hose through the air inflation one-way valve (36), repeating the expansion process of the upper section of the elastic hose by the lower section of the elastic hose, and completely extruding the grout in the grout conveying pipe (23) into the grout 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 a set value, 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;
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, and the section of elastic hose is contracted and restored; the air in the adjacent lower section of elastic hose is in a high-pressure state, and 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, the exhaust one-way valve (37) is opened, the air in the section of air pipe 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;
step S15: and 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 steps S11-S15 to finish the slurry injection of all the drill holes.
10. The method for constructing a composite pipeline system for long-distance cement slurry transportation suitable for tunnel curtain grouting according to claim 9, wherein before the step S11, drilling is further included, and during drilling, the water transportation pipeline (1) injects water to a working surface, specifically as follows:
the pulp inlet valve (24) and the air inlet valve (34) are closed, the pulp outlet valve (25), the starting point air escape valve (35-1) and the end point air escape valve (35-2) are opened, and the pulp 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 extruded;
and 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 the drilling hole on the working surface in construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210392784.1A CN114776307A (en) | 2022-04-14 | 2022-04-14 | Composite pipeline system suitable for long-distance cement slurry conveying of tunnel curtain grouting and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210392784.1A CN114776307A (en) | 2022-04-14 | 2022-04-14 | Composite pipeline system suitable for long-distance cement slurry conveying of tunnel curtain grouting and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114776307A true CN114776307A (en) | 2022-07-22 |
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ID=82428469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210392784.1A Pending CN114776307A (en) | 2022-04-14 | 2022-04-14 | Composite pipeline system suitable for long-distance cement slurry conveying of tunnel curtain grouting and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114776307A (en) |
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2022
- 2022-04-14 CN CN202210392784.1A patent/CN114776307A/en active Pending
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