CN110410143B - A drainage system for reverse slope tunnel construction - Google Patents
A drainage system for reverse slope tunnel construction Download PDFInfo
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- CN110410143B CN110410143B CN201910627692.5A CN201910627692A CN110410143B CN 110410143 B CN110410143 B CN 110410143B CN 201910627692 A CN201910627692 A CN 201910627692A CN 110410143 B CN110410143 B CN 110410143B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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Abstract
本发明公开了一种反坡隧道施工排水系统，属于施工排水系统领域，包括移动式潜水泵、移动水箱泵站、集水坑装置、洞外沉淀排水装置和排水管。移动式潜水泵通过排水管与移动水箱泵站连接。移动水箱泵站经排水管与集水坑装置连接。集水坑装置经排水管与洞外沉淀排水装置连接。移动式潜水泵的进水口设置在反坡隧道施工的掌子面底部。本发明造价低廉，方便使用，并可重复利用，可实现反坡隧道掌子面附近积水及时排出，保证掌子面状态稳定，降低施工风险。
The present invention discloses a reverse slope tunnel construction drainage system, which belongs to the field of construction drainage systems, and includes a mobile submersible pump, a mobile water tank pump station, a sump device, an outside-tunnel sedimentation drainage device, and a drainage pipe. The mobile submersible pump is connected to the mobile water tank pump station through a drainage pipe. The mobile water tank pump station is connected to the sump device through a drainage pipe. The sump device is connected to the outside-tunnel sedimentation drainage device through a drainage pipe. The water inlet of the mobile submersible pump is arranged at the bottom of the face of the reverse slope tunnel construction. The present invention is low in cost, convenient to use, and can be reused, and can realize the timely discharge of accumulated water near the face of the reverse slope tunnel, ensure the stability of the face state, and reduce construction risks.
Description
Technical Field
The invention relates to the field of construction drainage systems, in particular to a reverse slope tunnel construction drainage system.
Background
In the reverse slope tunnel construction process, groundwater and construction water are collected towards the face, so that surrounding rocks at the lower part of the face are in a water soaking state, the surrounding rocks are easy to soften and unstable, the life safety of operators is seriously threatened, and the problem of water in the face is always puzzled by engineering staff. Meanwhile, as the face is frequently accumulated water, the construction progress can be seriously affected, so that the construction efficiency is reduced, the construction period is prolonged, and the like.
Therefore, in order to drain or supply the groundwater and the construction water in the construction process of the reverse slope tunnel better, an efficient drainage system needs to be designed, so that the construction process of the reverse slope tunnel is safer, the construction efficiency is higher, the construction engineering of the reverse slope tunnel can be finished in advance, and the safety of constructors is improved.
Disclosure of Invention
The invention aims to provide a drainage system for reverse slope tunnel construction, which aims to solve the technical problems that surrounding rock at the lower part of a tunnel face is in a water soaking state in the existing reverse slope tunnel construction process, the surrounding rock is easy to soften and unstable, the life safety of operators is seriously threatened, and the construction period is prolonged.
The utility model provides a reverse slope tunnel construction drainage system, includes portable immersible pump, removal water tank pump station, sump pit device, hole outer sediment drainage device and drain pipe, portable immersible pump passes through the drain pipe and is connected with removal water tank pump station, removal water tank pump station is connected with the sump pit device through the drain pipe, the sump pit device is connected with hole outer sediment drainage device through the drain pipe, the water inlet setting of portable immersible pump is in the face bottom of reverse slope tunnel construction, portable immersible pump, removal water tank pump station and sump pit device all set up in the hole in reverse slope tunnel.
Further, the movable water tank pump station comprises a water storage tank, a water inlet valve, a water storage tank fixing block and a water storage tank water suction pump, wherein the water storage tank fixing block is arranged on two sides of the bottom of the water storage tank, the water inlet valve is arranged at a water inlet of the water storage tank, and the water storage tank is communicated with the water collecting pit device through the water storage tank water suction pump.
Further, the number of the water inlets of the water storage tank is three, water inlet valves are arranged on the three water inlets, fixing holes are formed in the water storage tank fixing blocks, and reinforcing steel bars penetrate through the fixing holes to drive the underground fixed water storage tank.
Further, the number of the water collecting pit devices is set to be 2-3, the interval between each water collecting pit device is 300-400 m, and the first water collecting pit device is arranged at a position 500m away from the opening of the reverse slope tunnel.
Further, sump assembly includes sump inlet tube, catch basin, baffle, catch basin, top grid, rod-type level sensor, control box, the first suction pump of catch basin, catch basin second suction pump, catch basin third suction pump, suction pump valve, play water collecting main and suction pump fixed bottom, the one end setting of catch basin inlet tube is in the top of catch basin, and the other end is connected with the movable water tank pump station, the baffle sets up between catch basin and catch basin, and is provided with the limber hole on the baffle, catch basin and catch basin all are the formation of digging into the underground under the reverse slope tunnel surface, top grid sets up the top at catch basin and catch basin, rod-type level sensor sets up in catch basin, and is connected with the control box, the first suction pump of catch basin, catch basin second suction pump and catch basin third suction pump are connected with the control box respectively, and the water inlet of the first suction pump of catch basin, catch basin second suction pump and catch basin third suction pump all set up in the water collecting basin, first suction pump, catch basin and third suction pump and the water collecting basin all set up in the water collecting basin, first suction pump, the second catch basin and the third suction pump all sets up the water collecting basin, the first catch basin and the third suction pump all sets up the water pump, the water bottom is set up, the first catch basin, the catch basin and the first catch basin and the third suction pump all sets up.
Further, a water pump controller is arranged in the control box, the model of the water pump controller is SM5-A1-2200, the water pump controller receives and controls the water pump to start according to the received liquid level signal of the rod type liquid level sensor, and the rod type liquid level sensor uses Wo Erke LHS connecting rod floating ball sensor.
Further, the outer sediment drainage device in hole includes first sedimentation tank, first baffle, second sedimentation tank, second baffle and third sedimentation tank, first sedimentation tank, second sedimentation tank and third sedimentation tank are the surface formation of digging down, first baffle setting is between first sedimentation tank and second sedimentation tank, the second baffle setting is between second sedimentation tank and third sedimentation tank, all be provided with the filtration water gap on first baffle and the second baffle, the filtration water gap on the second baffle is higher than the filtration water gap position of first baffle.
Further, a temporary water collecting well is arranged at the bottom of the tunnel face of the reverse slope tunnel construction, and the temporary water collecting well collects groundwater and construction water to be pumped to a movable water tank pump station by a movable submersible pump.
Further, a plurality of water collecting channels are arranged on the side edge of the water collecting pit device, and the water collecting channels collect underground water in the counter-slope tunnel and flow into the water collecting pit device.
The invention adopts the technical proposal and has the following technical effects:
The invention has low cost, convenient use and repeated use, can realize timely drainage of accumulated water near the tunnel face of the reverse slope tunnel, ensures stable state of the tunnel face, reduces construction risk, ensures safer construction process of the reverse slope tunnel, has higher construction efficiency, can finish construction engineering of the reverse slope tunnel in advance, improves the safety of constructors, simultaneously uses the movable water tank pump station, can carry out movable pumping according to the movement of construction, is suitable for use in the construction process of the reverse slope tunnel, has the flexibility of real-time movement, simultaneously uses the movable water tank pump station to collect groundwater, and simultaneously can be used for supplying water for construction in real time.
Drawings
FIG. 1 is a schematic diagram of a system according to the present invention.
FIG. 2 is a schematic diagram of a mobile water tank pump station according to the present invention.
Fig. 3 is a schematic structural view of the sump device according to the present invention.
FIG. 4 shows the present invention the structure of the water pump is schematically shown.
FIG. 5 is a schematic diagram of the structure of the drainage device for the sediment outside the hole.
Reference numerals in the drawings: 1. a mobile submersible pump; 2. moving the water tank pump station; 2.1, a water storage tank; 2.2, a water inlet valve; 2.3, a water storage tank fixing block; 2.4, a water pump of the water storage tank; 3. a sump device; 3.1, a water inlet pipe of a water collecting pit; 3.2, a water collecting tank; 3.3, a separator; 3.4, a water collecting sedimentation tank; 3.5, top grid plate; 3.6, a rod type liquid level sensor; 3.7, a control box; 3.8, a first water suction pump of the water collecting tank; 3.9, a second water suction pump of the water collecting tank; 3.10, a third water pump of the water collecting tank; 3.11, a water pump valve; 3.12, a water outlet collecting pipe; 3.13, fixing a base of the water pump; 4. a sedimentation drainage device outside the hole; 4.1, a first sedimentation tank; 4.2, a first separator; 4.3, a second sedimentation tank; 4.4, a second separator; 4.5, a third sedimentation tank; 5. and (5) a water drain pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and by illustrating preferred embodiments. It should be noted, however, that many of the details set forth in the description are merely provided to provide a thorough understanding of one or more aspects of the invention, and that these aspects of the invention may be practiced without these specific details.
Referring to fig. 1, the invention provides a drainage system for reverse slope tunnel construction, which comprises a movable submersible pump 1, a movable water tank pump station 2, a water collecting pit device 3, an out-hole sediment drainage device 4 and a drainage pipe 5. The movable submersible pump 1 is connected with the movable water tank pump station 2 through a drain pipe 5, the movable water tank pump station 2 is connected with the water collecting pit device 3 through the drain pipe 5, the water collecting pit device 3 is connected with the hole external sedimentation drainage device 4 through the drain pipe 5, the water inlet of the movable submersible pump 1 is arranged at the bottom of a face of the construction of a reverse slope tunnel, and the movable submersible pump 1, the movable water tank pump station 2 and the water collecting pit device 3 are all arranged in the hole of the reverse slope tunnel.
The number of the movable water tank pump stations 2 can be increased according to the on-site distance requirement, the interval is generally 500 meters, one movable submersible pump 1 is arranged at intervals, the existing submersible pump is used, meanwhile, an iron plate is fixed at the bottom of the submersible pump, and then four universal wheels are welded at the bottom of the iron plate, so that the movable submersible pump is realized. Wheels can be arranged at the bottom of the movable water tank pump station 2, convenient to move at ordinary times. The movable submersible pump 1 pumps water at the bottom of the support surface to the movable water tank pump station 2, the number of the movable submersible pumps 1 is set according to the amount of underground water, and one movable water tank pump station 2 can be connected with three movable submersible pumps 1 at the same time. The water is pumped into the water collecting pit device 3 by the movable water tank pump station 2, and is pumped into the hole-outside sediment drainage device 4 from the water collecting pit device 3 for sediment and then is discharged.
In the embodiment of the invention, the movable water tank pump station 2 comprises a water storage tank 2.1, a water inlet valve 2.2, a water storage tank fixing block 2.3 and a water storage tank water suction pump 2.4, wherein the water storage tank fixing block 2.3 is arranged at two sides of the bottom of the water storage tank 2.1, the water inlet valve 2.2 is arranged at a water inlet of the water storage tank 2.1, and the water storage tank 2.1 is communicated with the water collection pit device 3 through the water storage tank water suction pump 2.4. The number of the water inlets of the water storage tank 2.1 is three, water inlet valves 2.2 are arranged on the three water inlets, fixing holes are formed in the water storage tank fixing blocks 2.3, and steel bars penetrate through the fixing holes to drive the underground water storage tank 2.1. The water tank 2.1 is a 9m3 mobile water tank (1.5mX3mX2m) made of metal material. The water inlet valve 2.2 is a manual rotary valve and is arranged at the water inlet, and if the water inlet is not used, the water inlet valve 2.2 on the water inlet is closed and is opened when in use. The water storage tank 2.1 is fixed by the water storage tank fixing block 2.3 through steel bar or fixing bolt, and sliding is prevented. The water pump 2.4 of the water storage tank is also a submersible pump.
In the embodiment of the invention, the number of the water collecting pit devices 3 is set to be 2-3, the interval between each water collecting pit device 3 is 300-400 m, and the first water collecting pit device 3 is arranged at a position 500 m away from the opening of the reverse slope tunnel. The water collecting pit device 3 comprises a water collecting pit water inlet pipe 3.1, a water collecting pit 3.2, a partition plate 3.3, a water collecting sedimentation tank 3.4, a top grid plate 3.5, a rod type liquid level sensor 3.6, a control box 3.7, a water collecting pit first water suction pump 3.8, a water collecting pit second water suction pump 3.9, a water collecting pit third water suction pump 3.10, a water suction pump valve 3.11, a water outlet collecting main pipe 3.12 and a water suction pump fixed bottom 3.13, one end of the water collecting pit water inlet pipe 3.1 is arranged above the water collecting pit 3.2, the other end of the water collecting pit water inlet pipe is connected with a movable water tank pump station 2, the partition plate 3.3 is arranged between the water collecting pit 3.2 and the water collecting sedimentation tank 3.4, water holes are formed in the partition plate 3.3.3 by digging into the ground under the surface of a reverse slope tunnel. The top grid plate 3.5 is arranged above the water collecting tank 3.2 and the water collecting sedimentation tank 3.4, and the rod type liquid level sensor 3.6 is arranged in the water collecting sedimentation tank 3.4 and is connected with the control box 3.7. The first suction pump 3.8 of catch basin, catch basin second suction pump 3.9 and catch basin third suction pump 3.10 are connected with control box 3.7 respectively, and the water inlet of catch basin first suction pump 3.8, catch basin second suction pump 3.9 and catch basin third suction pump 3.10 all sets up in catch basin 3.4, the delivery port of catch basin first suction pump 3.8, catch basin second suction pump 3.9 and catch basin third suction pump 3.10 all communicates with water collection pipe 3.12, and all is provided with suction pump valve 3.11, the bottom of catch basin first suction pump 3.8, catch basin second suction pump 3.9 and catch basin third suction pump 3.10 all is provided with suction pump unable adjustment base 3.13. The water collecting tank 3.2 collects water pumped up from the movable water tank pump station 2 and simultaneously precipitates the water after passing through the partition plate 3.3. The sediment can not directly enter the water collecting sedimentation tank 3.4 along with the water, so that the pumped water is cleaner, and the blockage in the pumping process is prevented. The top grid plate 3.5 serves for protection against workers or tools falling into the sump 3.2 and the sump 3.4. The control box 3.7 is provided as a square metal box connected to an external 220V mains supply. The first water suction pump 3.8 of the water collecting tank, the second water suction pump 3.9 of the water collecting tank and the third water suction pump 3.10 of the water collecting tank are simultaneously controlled by the control box 3.7.
A water pump controller is arranged in the control box 3.7, the model of the water pump controller is SM5-A1-2200, the water pump controller receives and controls the water pump to start according to the received liquid level signal of the rod type liquid level sensor 3.6, and the rod type liquid level sensor 3.6 uses Wo Erke LHS connecting rod floating ball sensor. When the water level detected by the rod-type liquid level sensor 3.6 is less than 1 meter, the water pump controller controls one water pump to start, when the water level is more than 1 meter and less than two meters, two water pumps are started, and when the water level is more than 2 meters and less than 3 meters, three water pumps are started. The other water pumps of the application are all connected with the mains supply through the switch, and the switch is controlled manually.
In the embodiment of the invention, the hole-outside sedimentation drainage device 4 comprises a first sedimentation tank 4.1, a first partition board 4.2, a second sedimentation tank 4.3, a second partition board 4.4 and a third sedimentation tank 4.5, wherein the first sedimentation tank 4.1, the second sedimentation tank 4.3 and the third sedimentation tank 4.5 are formed by digging down ground surfaces, the first partition board 4.2 is arranged between the first sedimentation tank 4.1 and the second sedimentation tank 4.3, the second partition board 4.4 is arranged between the second sedimentation tank 4.3 and the third sedimentation tank 4.5, the first partition board 4.2 and the second partition board 4.4 are respectively provided with a filtering water through hole, and the position of the filtering water through hole on the second partition board 4.4 is higher than that of the first partition board 4.2. After three layers of sedimentation, the water at the water outlet of the third sedimentation tank 4.5 meets the discharge standard. One partition 4.2 and the second partition 4.4 are each bricked. The first sedimentation tank 4.1, the second sedimentation tank 4.3 and the third sedimentation tank are set to be 4×3×4 in size.
In the embodiment of the invention, a temporary water collecting well is arranged at the bottom of a tunnel face of the reverse slope tunnel construction, and the temporary water collecting well collects underground water and construction water for the mobile submersible pump 1 to be pumped to the mobile water tank pump station 2. The temporary water collecting well can collect underground water rapidly, so that water pumping is more efficient, and management staff are reduced.
In the embodiment of the invention, a plurality of water collecting channels are arranged on the side edge of the water collecting pit device 3, and the water collecting channels collect underground water in the counter-slope tunnel to flow into the water collecting pit device 3. The sump device 3 simultaneously collects a lower groundwater at the side so as to keep the ground of the counter-slope tunnel dry.
When the front excavation of the inclined shaft face is within 500m
Reverse slope drainage scheme: and pumping and discharging the underground water collected by the tunnel face into a movable pump station by using a movable sewage pump, pumping and discharging the underground water into a three-stage sedimentation tank outside the tunnel in a grading and transferring mode, and discharging the underground water to a designated place after sedimentation. The flow chart is as follows:
The face is provided with a temporary water accumulation pit, a movable water pump, a movable pump station (a 9m3 movable water tank (1.5mX3mX2m), a No. 1 water collection pit sediment Chi Bengzhan (30 m 3), a No.2 water collection pit sediment Chi Bengzhan (30 m 3), an out-hole sedimentation tank,
1. No.2 sump is to adopt many low-lift large-traffic sewage pumps to pump and drain to the sedimentation tank outside the hole step by step, and equipment model designs to: the flow rate of 100WQ87-28-15 is 87-100m3/h, the lift of 25-28m and the power of 15kw (the model is universal, and the replacement of parts and accessories in the later period is convenient) is adjusted according to the water quantity during construction.
When the face is excavated away from the wellhead at (500 m),
In order to prevent the large water inflow of the inclined shaft, a cavity is dug on the right side wall of the shaft, a No. 1 temporary fixed pump station is arranged, and 3 large-flow water pumps are adopted to directly pump and drain water to a sedimentation tank outside the cavity. ( Description: if the water inflow exceeds the design value, a reserved position for installing a standby pump is additionally arranged at the position, )
The required lift of the water pump of the temporary pump station 1 is (the gap between the hole and the temporary pump station 1 is 500m, the gradient is 8.92 percent), and the net height difference is 44.6m
HB＝HSY/ηg＝(45+3)÷0.8＝60m
In the middle of
HB, the required lift of the water pump, m;
Hsy—the lateral height, i.e. the height difference between the lowest water level of the suction well and the outlet of the drain pipe, is generally preferably hsy=the difference between the bottom of the well and the ground level +3;
ηg—pipeline efficiency. When the pipeline is laid in the vertical shaft, ηg=0.9 to 0.89; when the pipeline is laid in an inclined well and the inclination angle alpha is more than 30 degrees, eta < g > = 0.83-0.8; when alpha=30-20 degrees, ηg=0.8-0.77; when α is less than 20 °, ηg=0.77 to 0.74.
(3) When the construction of the inclined shaft well body is in the middle stage, the number of stages of the drainage pump station is increased, the probability of faults is correspondingly increased, so that a cavity or a temporary welding steel plate water tank is excavated on the right side wall of the well body at the positions 500m and 1000m away from the well mouth respectively, and a No. 1 temporary pump station and a No. 2 temporary pump station are arranged. Simultaneously, the face mobile water tank and the sump pump are moved forward according to the construction progress; and the subsequent drainage of the inclined shaft is pumped and discharged to the sedimentation tank outside the hole by the temporary pump station No. 2 and the temporary pump station No. 1.
When the tunnel face is excavated from the wellhead to the interval of 500m to 1000m, the drainage flow chart comprises the following steps of: the tunnel face 1# mobile pump station, the water collecting pit pump station, the pump drainage to the No. 1 temporary pump station at the 500m position, and the direct pump drainage to the outside of the tunnel;
along with the forward tunneling of the face excavation face, the mobile pump station moves forward along with the progress of the face;
When the construction of the inclined shaft reaches 800m from the wellhead, a cavity is excavated on the right side wall of the well body, the position of a subsequent No. 2 fixed pump station is reserved, the pumping and draining amount is designed to be equal to that of a pump station at the bottom of the well, when the construction of the inclined shaft reaches 1000m from the wellhead, a cavity is excavated on the right side wall of the well body, a No. 2 temporary pump station is arranged, and a plurality of 3 high-lift high-flow water pumps are adopted to directly pump and drain water to a sedimentation tank outside the cavity. ( Description: if the water inflow exceeds the design value, a reserved position for installing a standby pump is additionally arranged at the position )
① And (3) calculating: the required lift of the water pump of the No.2 temporary pump station is (1-2 temporary pump stations are spaced by 500m, the gradient is 8.92%) and the net height difference is 44.6m
HB＝HSY/ηg＝(45+3)÷0.8＝60m
In the middle of
HB, the required lift of the water pump, m;
Hsy—the lateral height, i.e. the height difference between the lowest water level of the suction well and the outlet of the drain pipe, is generally preferably hsy=the difference between the bottom of the well and the ground level +3;
ηg—pipeline efficiency. When the pipeline is laid in the vertical shaft, ηg=0.9 to 0.89; when the pipeline is laid in an inclined well and the inclination angle alpha is more than 30 degrees, eta < g > = 0.83-0.8; when alpha=30-20 degrees, ηg=0.8-0.77; when α is less than 20 °, ηg=0.77 to 0.74.
② And (3) calculating: the required lift of the water pump of the No. 2 fixed pump station is that the clearance between the opening and the No. 2 pump station is 800m, the gradient is 8.92 percent, and the net height difference is 71.4m
HB＝HSY/ηg＝(71+3)÷0.8＝92.5m
In the middle of
HB, the required lift of the water pump, m;
Hsy—the lateral height, i.e. the height difference between the lowest water level of the suction well and the outlet of the drain pipe, is generally preferably hsy=the difference between the bottom of the well and the ground level +3;
ηg—pipeline efficiency. When the pipeline is laid in the vertical shaft, ηg=0.9 to 0.89; when the pipeline is laid in an inclined well and the inclination angle alpha is more than 30 degrees, eta < g > = 0.83-0.8; when alpha=30-20 degrees, ηg=0.8-0.77; when α is less than 20 °, ηg=0.77 to 0.74.
(4) And excavating the face within the range of 1000m to 1570m from the wellhead.
The face moves the sewage pump to drain to the nearby temporary pump station No. 2.
Drainage flow chart: the mobile pump station of the tunnel face, the No. 2 temporary pump station at the position of 1000m and the No.1 temporary pump station at the position of 500m are directly pumped out of the tunnel; the water quantity may be increased at any time in this stage, and the spare water pump is stored nearby.
(5) When the tunnel face is excavated 1570m away from the wellhead to the bottom of the well towards the small mileage direction of the main tunnel, the fixed pump station mainly bears the drainage tasks of the inclined shaft and the entrance section of the tunnel after the inclined shaft reaches the bottom of the well according to the construction progress. Considering the possibility of sudden water burst at any time of a tunnel, from the safety aspect, designing a two-stage pump station pumping drainage, setting a large water sump at the bottom of a well at the position of three branches or close to a small mileage 1494m, setting a No. 1 fixed pump station, setting a No. 2 fixed pump station at the position of the inclined shaft well body, which is 800m away from a hole opening, and draining water to the outside of the hole in a relay pumping drainage mode, wherein at the moment, the original No. 1 and No. 2 temporary pump station equipment is dismantled.
Drainage flow chart: the method comprises the steps of moving a pump station on a tunnel face, collecting a water pit, settling the pump station 1, settling the pump station 2 and settling the pump station outside the tunnel.
And (3) calculating: the pump head of the No. 1 fixed pump station is (the interval between the bottom of the well and the No. 2 fixed pump station is 800m, the gradient is 8.92 percent), and the net height difference is 71.4m
HB＝HSY/ηg＝(71+3)÷0.8＝92.5m
Then during the drainage of the inclined shaft, the pump stations 1 and 2 are fixed, and each stage of lift is at least about 92 meters.
Drainage of hole
According to the design and arrangement of the guiding construction organization of the design drawing, the overall length 10491m of the Chinese wood kernel tunnel is marked with 8 to bear the 4494m construction task of the tunnel (single hole); after the inclined shaft enters the positive hole, the section from the right hole to the small mileage direction is 1479m for reverse slope construction, and the section from the left hole to the small mileage direction is 1400m for reverse slope construction. The relative height difference is 26 m, the gradient is-1.75%, each 500m distance is directly through the horizontal passageway setting up 1,2, no. 3 sump pump stations, equipment model design is: 100WQ87-28-15 flow 87-100m3/h lift 25-28m power 15kw (3 pump stations are used for each pump station, two purposes are provided) (the model is universal, the replacement of later parts is convenient), pumping is carried out step by step to a pump station of a large water sump at the bottom of a well, and pumping is carried out step by step to a water sump of a No. 1 well bottom fixed pump station at the bottom of the well through a sewage pump. The construction of the inverted arch of the positive tunnel, the movable water tank pump station is arranged in front of the inverted arch operation surface, the front running water is cut off, 2 small-sized sewage pumps are installed and pumped and discharged into the water collecting tank of the fixed pump station step by step through DN100 pipelines, and finally the sewage is pumped and discharged out of the well by the 1 # and 2# fixed pump stations.
The right hole of the tunnel outlet section in the direction of the tunnel inlet section is 3015m reverse slope single-head construction, the relative height difference is 53m, and the left hole is 3094m reverse breaking construction: 54 meters.
While the fundamental and principal features of the invention and advantages of the invention have been shown and described, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
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| CN111580569B (en) * | 2020-05-25 | 2022-12-20 | 安徽华希电力科技有限公司 | Cable tunnel water level control system |
| CN111963239A (en) * | 2020-07-17 | 2020-11-20 | 中交一公局集团有限公司 | A kind of reverse slope drainage construction technology |
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