Self-compacting concrete two-way construction structure for long-distance water delivery tunnel

Abstract

The utility model discloses a self-compacting concrete two-way construction structure for a long-distance water delivery tunnel, which comprises at least one long-distance water delivery tunnel, a plurality of working wells are arranged on a construction line of the tunnel, and a middle well is arranged beside the middle of a tunnel section between two adjacent working wells. A communicating connection channel is arranged between the tunnel section and the middle well and divides the construction space in the tunnel into a parking area right facing the connection channel, and a first working face and a second working face which are arranged on the two sides of the parking area respectively. According to the structure, the middle well and the connecting channel are additionally arranged beside the middle of the tunnel, two working faces are expanded in a limited single construction space, the length of a construction route in each working face is shortened, the construction progress is accelerated, and the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel self-compacting concrete construction, in particular to a self-compacting concrete bidirectional construction structure for a long-distance water delivery tunnel. Background Art

[0002] In 1988, Professor Okamura Tsuyoshi of the University of Tokyo proposed self-compacting concrete. After more than 30 years of development, it has been widely used in tunnel self-compacting concrete construction due to its advantages such as high fluidity, uniformity and stability, and no need for vibration during pouring.

[0003] In the tunnel construction of the water supply project, after the shield tunnel is completed and the lining steel pipe is installed, it is necessary to fill the space between the lining steel pipe and the shield pipe segment with self-compacting concrete. Since the construction site of the long-distance water supply tunnel is closed and narrow, the working surface is single, the transportation direction of the concrete transportation device is limited and the distance is long, resulting in a long time for the concrete to be transported to the construction surface. As a result, before being filled and poured, the water in the concrete evaporates a lot, and it is subject to greater vibration and impact. The fluidity of the concrete is poor, affecting its working performance and strength, which leads to common quality defects such as "bulking" and "loose filling" of the lining steel pipe. It is also easy to block the pipeline during pouring, seriously affecting the construction efficiency and slowing down the construction progress. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a self-compacting concrete bidirectional construction structure for a long-distance water conveyance tunnel, by arranging an intermediate well and a communication channel in the middle of the long-distance water conveyance tunnel to increase the working surface, and cooperating with the chute arranged in the intermediate well and the communication channel, the bidirectional transport tank truck arranged in the tunnel and the diesel truck-mounted pump to improve the concrete transportation method, thereby solving the problems of low efficiency of self-compacting concrete pouring in the long-distance water conveyance tunnel and difficulty in transporting the self-compacting concrete in the tunnel.

[0005] The utility model provides a self-compacting concrete bidirectional construction structure for a long-distance water conveyance tunnel, comprising at least one long-distance water conveyance tunnel, a plurality of working wells arranged on the construction route of the tunnel, an intermediate well arranged on the side of the middle of the tunnel section between two adjacent working wells, a connecting channel arranged between the tunnel section and the intermediate well, the connecting channel divides the construction space in the tunnel into a parking area facing the connecting channel, a first working surface and a second working surface arranged on both sides of the parking area. Furthermore, the top of the intermediate well is connected to the ground, and the bottom extends vertically to the bottom of the tunnel.

[0006] Furthermore, ventilation and power supply equipment and a chute for unloading materials are arranged in the middle well and the connecting channel. The feed end of the chute extends to the ground and is connected to the concrete conveying equipment, and the discharge end of the chute passes through the middle well and the connecting channel to reach the parking area.

[0007] Furthermore, a two-way transport tank truck and a diesel vehicle-mounted pump are arranged in the parking area. The feed end of the two-way transport tank truck is detachably connected to the slide pipe, and the discharge end of the two-way transport tank truck is connected to the feed end of the diesel vehicle-mounted pump. The diesel vehicle-mounted pump is connected to the casting pipeline through a pump pipe.

[0008] Furthermore, a hole is dug underground by a rotary drilling rig with a diameter of 2m, and the bottom of the well extends 2m into the bottom of tunnel 2. The wall of the middle well is made of a steel pipe with an outer diameter of 1800mm and a thickness of 22mm. A 12cm high stiffening ring is installed inside the steel pipe, and grouting backfill is used to compact the space between the steel pipe and the surrounding rock wall of the borehole.

[0009] Furthermore, the inner lining of the communication channel is designed as a straight wall semi-circular arch structure with a net width of 2500mm and a net height of 2900mm.

[0010] Furthermore, there are two working shafts, which are arranged at the starting end and the ending end of the tunnel respectively.

[0011] Furthermore, there are at least three working shafts, which are respectively arranged at the starting end, the ending end and the middle of the tunnel.

[0012] Furthermore, there are two water transfer tunnels arranged in parallel, and an intermediate well and a communication channel are provided on the sides of the middle of the tunnel section between two adjacent working wells in each tunnel, and the working wells on the sides of the opposite tunnel sections in the two tunnels are arranged oppositely and staggered.

[0013] Beneficial effects of the utility model:

[0014] 1. The utility model structure adds an intermediate well and a connecting passage to the side of the middle of the tunnel, transports large materials or equipment such as lining steel pipes into the tunnel through the working wells at both ends of the tunnel, uses the intermediate well to transport concrete, ventilate, and power, and expands two working faces and parking areas in a limited single construction space, so that the lining steel pipes are generally transported from the working well to the intermediate well, and the lining steel pipes are installed and poured from the intermediate well to the working well. Not only can two construction routes be parallel and not interfere with each other, but also the length of the construction route in each working face is greatly shortened, the construction progress is accelerated, the construction efficiency is improved, the working performance and strength of the concrete are avoided to be reduced during the long-term transportation process, and the quality defects such as "bundling" and "uncompacted filling" of the lining steel pipes are effectively avoided. It also avoids the blockage of the pipeline during pouring, and greatly improves the construction efficiency. Furthermore, the intermediate well can also improve the ventilation conditions in the tunnel and ensure the safety risks of long tunnel construction.

[0015] 2. The bidirectional transport tank truck adopted in the structure of the utility model has a faster driving speed, and a cab is provided at both ends. It is more adaptable to narrower tunnel lanes, does not need to turn around, and can cooperate with the middle well to realize bidirectional back and forth driving for receiving and delivering materials in each working surface. The lining steel pipe that has been cast can be used as the operation channel of the bidirectional transport tank truck and the diesel truck pump, shortening the round-trip distance of each concrete transportation and reducing the transportation time of concrete. It also avoids the reduction of working performance and strength of concrete during long-term transportation, and avoids quality defects such as "bulking" and "loose filling" of the lining steel pipe to a limited extent, and also avoids clogging of the pipeline during casting, greatly improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the construction route of a long-distance water diversion tunnel;

[0017] Figure 2 is a top view schematic diagram of the arrangement of the tunnel, the intermediate well and the communication channel in Example 1;

[0018] Figure 3 It is a three-dimensional schematic diagram of the arrangement of the tunnel, the intermediate well and the communication channel in Example 1;

[0019] Figure 4 This is a schematic diagram of construction in the first working face moving away from the middle well;

[0020] Figure 5 This is a schematic diagram of construction in the second working face moving away from the middle well;

[0021] Figure 6 It is a schematic diagram of layered pouring of self-compacting concrete in a pouring bin;

[0022] Figure 7 It is a schematic diagram of the layout of the first and second layer pouring pipelines during layered pouring;

[0023] Figure 8 It is a schematic diagram of the layout of the third layer pouring pipeline during layered pouring;

[0024] Fig. 9 It is a schematic diagram of the structure of the exhaust device during pouring;

[0025] Fig.10 is a schematic diagram of the first working surface and the second working surface being constructed simultaneously in Example 2;

[0026] Fig.11 It is a construction cross-section diagram of two parallel tunnels in Example 3.

[0027] In the figure:

[0028] 1. Working shaft, 2. Tunnel, 3. Intermediate shaft, 4. Communication passage, 5. First working face, 6. Second working face, 7. Shield segment, 8. Lining steel pipe, 9. Curved formwork, 10. Tripod, 11. Pump pipe, 12. Y-shaped hose, 13. Long hose, 14. Work trolley, 15. Operating table, 16. Casing, 17. Insert pipe, 18. Fixing bolt, 19. Chute, 20. Two-way transport tank truck, 21. Diesel truck pump, 22. Casting bin, 23. Concrete conveying equipment, 24. Parking area. DETAILED DESCRIPTION

[0029] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0030] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] A self-compacting concrete bidirectional construction structure for a long-distance water delivery tunnel 2, such as Figure 2-Figure 5 As shown, it includes at least one long-distance water conveyance tunnel 2, and a plurality of working wells 1 are arranged on the construction route of the tunnel 2. An intermediate well 3 is arranged on the side of the middle of the tunnel 2 section between two adjacent working wells 1. A connecting passage 4 is arranged between the tunnel 2 section and the intermediate well 3. The connecting passage 4 divides the construction space in the tunnel 2 into a parking area 24 facing the connecting passage 4, and a first working surface 5 and a second working surface 6 respectively arranged on both sides of the parking area 24.

[0033] The top of the intermediate shaft 3 is connected to the ground, and the bottom extends vertically to below the tunnel 2 .

[0034] Ventilation and power supply equipment and a chute 19 for unloading are arranged in the middle shaft 3 and the connecting channel 4. The feeding end of the chute 19 extends to the ground and is connected to the concrete conveying equipment 23. The discharging end of the chute 19 passes through the middle shaft 3 and the connecting channel 4 and reaches the parking area 24.

[0035] A two-way transport tank truck 20 and a diesel vehicle-mounted pump 21 are arranged in the parking area 24. The feed end of the two-way transport tank truck 20 is detachably connected to the chute 19, and the discharge end of the two-way transport tank truck 20 is connected to the feed end of the diesel vehicle-mounted pump 21. The diesel vehicle-mounted pump 21 is connected to the casting pipeline through the pump pipe 11.

[0036] The middle well 3 is dug underground by a rotary drilling rig with a diameter of 2m, and the bottom of the well extends 2m into the bottom of the tunnel 22. The wall of the middle well 3 is made of a steel pipe with an outer diameter of 1800mm and a thickness of 22mm. A 12cm high stiffening ring is set inside the steel pipe, and grouting is used to fill the gap between the steel pipe and the surrounding rock wall of the borehole. The inner lining of the communication channel 4 is designed as a straight wall semi-circular arch structure with a net width of 2500mm and a net height of 2900mm.

[0037] There are two working shafts 1, which are respectively arranged at the starting end and the ending end of the tunnel 2. Alternatively, there are at least three working shafts 1, which are respectively arranged at the starting end, the ending end and the middle of the tunnel 2.

[0038] In one embodiment, two water transfer tunnels 2 are arranged in parallel, and an intermediate well 3 and a communication channel 4 are provided on the sides of the middle of the tunnel section between two adjacent working wells 1 on each tunnel 2, and the working wells 1 on the sides of the opposite tunnel sections on the two tunnels 2 are arranged oppositely and staggered.

[0039] There are two parallel water diversion tunnels in Kaihua Project in Quzhou, Zhejiang. The total length of a single tunnel is 6449m. Figure 1 As shown, there are SD02# located in the middle of the tunnel and SD01# and SD03# working shafts located at both ends of the tunnel, and the length of the tunnel section between SD01#-SD02# working shafts is 3504m.

[0040] Embodiment 1:

[0041] Taking a single tunnel between SD01# and SD02# working shaft 1 as an example, the bidirectional construction method of self-compacting concrete is specifically described, including the following steps:

[0042] S1: Figure 2 and Figure 3 As shown, an intermediate well 3 is added on the side of the middle of the tunnel section between the two adjacent working wells SD01# and SD02#. The top of the intermediate well 3 is connected to the ground, and the bottom extends vertically to the bottom of the tunnel 2.

[0043] S2: The shield tunnel 2 is constructed using an earth pressure balance shield machine. The outer diameter of the shield segment 7 is 6.0m, the inner diameter is 5.4m, and the thickness is 0.3m. A drainage plate is provided on the shield segment 7.

[0044] During the transition period after the shield tunnel is through, Figure 2 , Figure 3 and Figure 4 As shown, a communication passage 4 is arranged between the tunnel 2 and the intermediate shaft 3, and the construction space in the tunnel 2 is divided into a parking area 24 facing the communication passage 4, and a first working surface 5 and a second working surface 6 are arranged on both sides of the parking area 24; ventilation and power supply equipment and a chute 19 for unloading are arranged in the intermediate shaft 3 and the communication passage 4, and the feeding end of the chute 19 extends to the ground and is connected to the concrete conveying equipment 23, and the discharging end of the chute 19 reaches the parking area 24 of the tunnel 2 after passing through the intermediate shaft 3 and the communication passage 4.

[0045] S3: Figure 4 As shown, the lining steel pipe 8 is transported to the first working face 5, and the lining steel pipe 8 is installed and connected in sequence along the direction away from the middle well 3; specifically, the lining steel pipe 8 adopts a steel pipe with a diameter of 4.8m, and the steel pipe is 12m / section. Concrete pouring ports are set on the top and both sides of the waist of the lining steel pipe 8.

[0046] S4: After the installation and docking of each 24-36 m lining steel pipe 8 is completed, the two end surfaces thereof are fully annularly divided and sealed using an arc-shaped template 9 to form a casting bin 22.

[0047] S5: The two-way transport tank truck 20 is driven to the parking area 24 through the cab at one end, and the feed end of the two-way transport tank truck 20 is detachably connected to the discharge end of the chute 19. The concrete conveying equipment 23 on the ground transports the concrete to the two-way transport tank truck 20 through the chute 19; specifically, the discharge end of the chute 19 and the feed end of the two-way transport tank truck 20 are connected by flanges, clamps or threads through pipelines with valves.

[0048] S6: The two-way transport tank truck 20 drives close to the pouring bin 22, and the feed end of the diesel vehicle-mounted pump 21 is detachably connected to the discharge end of the two-way transport tank truck 20; the diesel vehicle-mounted pump 21 is connected to the pouring pipeline through the pump pipe 11, and the other end of the pouring pipeline is connected to the pouring port reserved on the lining steel pipe 8 in the pouring bin 22 to pump concrete; specifically, the feed end of the diesel vehicle-mounted pump 21 and the discharge end of the two-way transport tank truck 20 are connected through pipelines by flange connection, clamp connection or threaded connection.

[0049] S7: After the concrete in the bidirectional transport tank truck 20 is poured into the casting bin 22, it does not need to turn around and directly drives to the parking area 24 again through the cab at the other end, receives the concrete on the ground through the chute 19, and then drives close to the casting bin 22, and pumps the concrete to the casting bin 22 through the diesel vehicle-mounted pump 21, and repeats this cycle until the concrete pouring in the casting bin 22 is completed.

[0050] S8: Repeat steps S4-S7 to carry out the next round of construction of the casting bin 22 until the casting operation of all the lining steel pipes 8 in the first working surface 5 is completed.

[0051] S9: Figure 5 As shown, the lining steel pipe 8 is transported to the second working surface 6 , and the lining steel pipe 8 is installed and docked in sequence along the direction away from the middle well 3 .

[0052] S10: Repeat steps S4-S7 until the casting operation of all the lining steel pipes 8 in the second working surface 6 is completed.

[0053] S11: transport the lining steel pipe 8 to the parking area 24, and install and dock the lining steel pipe 8 along the direction from the first working surface 5 to the second working surface 6, and reserve a window for connecting the line on the lining steel pipe 8 facing the communication channel 4.

[0054] S12: After the installation and docking of each 24-36m lining steel pipe 8 is completed, the two end faces thereof are fully annularly divided and sealed using an arc-shaped template 9 to form a casting bin 22 until the installation of all lining steel pipes in the parking area is completed.

[0055] S13: Remove the chute 19 and the ventilation and power equipment lines, seal the windows on the lining steel pipe 8, drive the two-way transport tank truck 20 through the cab at one end to the vicinity of the casting bin 22, connect the discharge end of the two-way transport tank truck with the feed end of the diesel truck-mounted pump 21, connect the diesel truck-mounted pump 21 with the casting pipeline through the pump pipe 11, and connect the other end of the casting pipeline with the reserved casting port on the lining steel pipe 8 in the casting bin 22 to pump concrete.

[0056] S14: After the concrete in the bidirectional transport tank truck 20 is poured into the casting bin 22, it drives again to the working pit 1 through the cab at the other end to receive the concrete on the ground, and then drives close to the casting bin 22, and pumps the concrete to the casting bin 22 through the diesel vehicle-mounted pump 21, and repeats this cycle until the concrete pouring in the casting bin 22 is completed.

[0057] S15: Repeat steps S13-S14 until the pouring operation of all the lining steel pipes 8 in the parking area 24 is completed.

[0058] In step S1, a rotary drilling machine with a diameter of 2m is used to dig a through hole underground. The depth of the middle well 3 is 52.2m, and the bottom of the well extends 2m into the bottom of the tunnel 2. The wall of the middle well 3 is made of a steel pipe with an outer diameter of 1800mm and a wall thickness of 22mm. A 12cm high stiffening ring is set inside the steel pipe. Grouting is used to fill the gap between the steel pipe and the surrounding rock wall of the borehole. The inner lining of the communication channel 4 is designed as a straight wall semi-circular arch structure with a net width of 2500mm and a net height of 2900mm.

[0059] The two-way transport tank truck used in this embodiment is equipped with a cab at both ends, which is convenient for driving without turning around, and the operating speed can be increased to 5km / h, which is 1.6 times more efficient than the one-way transport tank truck. By deploying on-site technicians to perform equipment fault inspection and maintenance, the normal operation of the equipment is guaranteed, the construction efficiency is improved, and the construction safety is guaranteed. The diesel truck-mounted ground pump used in this embodiment does not need to be connected to electricity, which avoids the situation where the voltage of the conventional ground pump becomes unstable as the pouring distance increases, and it is flexible to move, making construction more convenient.

[0060] In step S4, Figure 7 As shown, when installing the curved template 9, it is fixed to the outside of the lining steel pipe 8 through a tripod 10, the inner side of the multiple curved templates fits the outer wall of the lining steel pipe 8, and the outer side of the curved template fits the inner wall of the shield segment 7. The curved template set on the top of the casting bin 22 is provided with 5mm holes to ensure good ventilation.

[0061] Specifically, the arc formwork 9 is made of an arc steel plate with a length of 1.4m and a thickness of 2mm in advance in the processing plant, and the tripod 10 is made of a triangle with a diameter of 18mm threaded steel. One side of the tripod 10 is welded to the arc form steel plate, and the other side is welded and fixed to the outer wall of the lining steel pipe 8. When installing the arc formwork 9, the installation sequence and time are reasonably arranged, and the installation gap of the lining steel pipe 8 at both ends of the casting bin 22 can be used for installation without affecting the installation progress of the lining steel pipe 8.

[0062] To improve the pouring efficiency, in steps S6 and S7, the pouring length for each pouring is 2 to 4 pouring bins, and preferably, the pouring length for each pouring is 72 m to 96 m.

[0063] To ensure the construction effect of the casting bin 22, Figure 6 As shown, in steps S6 and S7, each casting bin 22 is cast in three layers, and the casting pipelines for each layer are arranged in a single row and cast symmetrically hole by hole. Specifically, the first layer is cast at a height of 0.8m, the second layer is cast at a height of 1.9m, and the third layer is cast at a height of 2.7m. Each layer is cast with C30 self-compacting concrete.

[0064] Reference Figure 7When pouring the first layer in the pouring bin, the pouring pipeline adopts a Y-shaped hose 12, which is connected to the pump pipe 11 and fixed on the work trolley 14. The output ports at both ends are respectively connected to the pouring ports on both sides of the waist of the lining steel pipe 8 and concrete is pumped. After reaching the height of the first layer, the pipe is removed and cleaned, and the work trolley 14 is moved horizontally to the next pouring position; refer to Figure 7 , the pouring pipeline adopts a Y-shaped hose 12, and then the Y-shaped hose 12 is connected to the pump pipe 11 and fixed on the work trolley 14, and the output ports at both ends are respectively connected to the pouring ports on both sides of the waist of the lining steel pipe 8 at this position and pump concrete. After the pouring reaches the second layer height, the pipe is removed and cleaned, and then the work trolley 14 is moved horizontally to the next pouring position; refer to Figure 8 The pouring pipeline adopts a long hose 13, which is connected to the pump pipe 11 and fixed on the work trolley 14. The output port is connected to the pouring port on the top of the lining steel pipe 8 at this position and concrete is pumped until the pouring of the entire height is completed, and the pipe is removed and cleaned.

[0065] Strictly control the mix ratio of self-compacting concrete, the quality of raw materials and admixtures, and do a good job of preparation before pouring. Preferably, before pouring each layer of height in the pouring bin 22, check the pump pipe 11 and use mortar to fully lubricate the pipe before pouring; after pouring each layer of height, the time for removing, cleaning and installing the pipe is controlled within 15 minutes, which can effectively reduce pipe blockage and ensure smooth pipeline.

[0066] like Figure 7 As shown, the work trolley 14 includes a support frame, and the four corners of the bottom of the support frame are provided with pulleys with brakes. The top and both sides of the support frame are respectively provided with operating tables 15 corresponding to the pouring openings on the top and waist of the lining steel pipe 8. The two ends of the Y-shaped hose 12 are respectively fixed on the operating tables 15 on both sides of the work trolley 14, and the long hose 13 is fixed on the operating table 15 on the top of the work trolley 14. The work trolley 14 is convenient for docking the hose with the pouring opening on the lining steel pipe 8, and is easy to install and disassemble. The pouring pipeline is fixed on the operating table 15, which can ensure the stability of the pipeline when pumping concrete and facilitate the movement of the hose in the pouring bin 22.

[0067] In step S6, an exhaust device is manufactured before pouring, and the exhaust device includes a sleeve 16 and an insert 17 inserted into the sleeve 16. The sleeve 16 is threadedly connected with a fixing bolt 18, and the fixing bolt 18 is inserted into the sleeve 16 and tightly abuts against the outer wall of the insert 17. Fig. 9As shown, when pouring concrete, the insert pipe 17 is inserted to 1 cm inside the inner lining steel pipe 8. When there is the first leakage during the pouring process, the insert pipe 17 is inserted inward to 1 cm from the drain board and pouring is continued. When there is a second leakage during the pouring process, the insert pipe 17 is further inserted until it is completely pushed against the drain board. Specifically, the sleeve 16 and the insert pipe 17 are respectively selected from a DN32 galvanized steel pipe and a 40 cm long DN25 galvanized steel pipe.

[0068] The application effect of embodiment 1:

[0069] Table 1 Effect inspection table of different number of working surfaces

[0070]

[0071] The tunnel between the SD02#-SD01# working shafts in Example 1 passes through the 1.26km Dajinshan Mountain. The geology of Dajinshan Mountain is complex and the shield construction efficiency is low, so less construction period is reserved for the later lining construction. The example adopts the method of the present invention to improve the construction, so that the self-compacting concrete construction is standardized and efficient. As shown in Table 1, by calculating the two working faces of a single section of the tunnel, 1.4 months of construction period can be saved, the goal of water supply on schedule is achieved, and the project progress is ensured to be completed as planned.

[0072] Table 2 Curved steel plate installation effect check list

[0073]

[0074] In Example 1, by using curved steel plates, as shown in Table 2, it only takes 5.3 hours to install a bin plugging template on site, compared with the previous use of quick and easy netting to install a bin, which takes 8 hours, the installation efficiency is improved by 33% and the welding amount is reduced by 50%.

[0075] Table 3 Average pouring volume and time statistics

[0076]

[0077] Example 1 adopts a single-row mobile arrangement of pouring pipelines, symmetrical pouring of each hole, and pouring construction combined with the two-order exhaust method. As shown in Table 3, the actual pouring time of each bin is basically the same as the planned pouring time. No pipe blockage occurs during pouring. The construction is smooth and the average pouring strength can reach 10.4m 3 \h. After pouring, the tunnel lining steel pipes were checked for bulging and all the pouring quality assessments were qualified.

[0078] Embodiment 2:

[0079] Example 2 is another construction method for the self-compacting concrete construction of a single long-distance water diversion tunnel between SD01#-SD02# working shaft 1. Fig.10As shown, steps S1-S2 of embodiment 2 are the same as steps S1-S2 of embodiment 1, and the construction of the first working surface 5 of steps S3-S8 of embodiment 2 and the construction of the second working surface 6 of steps S9-S11 can be performed simultaneously. Compared with embodiment 1, embodiment 2 can further shorten the construction time and speed up the construction process.

[0080] Embodiment 3:

[0081] Embodiment 3 is a bidirectional construction method of self-compacting concrete for two parallel long-distance water conveyance tunnels between SD01#-SD02# working shafts 1, which is used for bidirectional construction of self-compacting concrete for two water conveyance tunnels 2, such as Figure 1 and Fig.11 As shown, an intermediate well 3 and a communication channel 4 are added on the opposite side of the middle of the two tunnel sections between the adjacent SD01# and SD02# working wells 1, and the two intermediate wells 3 are opposite and staggered. The subsequent construction steps of the lining steel pipe installation, layered plugging of the casting bin, and concrete pouring of the two tunnel sections are the same as those of Example 1 or Example 2.

[0082] Embodiment 3 arranges working shafts 3 and communication passages 4 on the sides of the middle parts of the two single-line tunnels. Compared with setting a common working shaft between the two single-line tunnels, although the construction cost is increased to a certain extent, each single-line tunnel has two working faces, and the material unloading, ventilation, and power supply construction in the working shafts of the two tunnels do not affect each other, which has higher work efficiency and better adaptability and safety.

[0083] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A self-compacting concrete bidirectional construction structure for long-distance water conveyance tunnels, characterized in that: An intermediate well is arranged on the side of the middle part of the tunnel section between two adjacent working wells on the construction route of the tunnel, and a connecting passage is arranged between the tunnel section and the intermediate well. A first working face, a parking area and a second working face are arranged in the tunnel in sequence, and the connecting passage is connected to the parking area. The top of the intermediate well is connected to the ground, and the bottom extends vertically to the bottom of the tunnel; ventilation and power supply equipment and a chute for unloading are arranged in the intermediate well and the connecting passage, the feed end of the chute extends to the ground and is connected to the concrete conveying equipment, and the discharge end of the chute reaches the parking area after passing through the intermediate well and the connecting passage; a two-way transport tank truck and a diesel truck-mounted pump are arranged in the parking area, the feed end of the two-way transport tank truck is detachably connected to the chute, the discharge end of the two-way transport tank truck is connected to the feed end of the diesel truck-mounted pump, and the diesel truck-mounted pump is connected to the casting pipeline through a pump pipe.

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