CN108316260B - Diversion tunnel plugging structure and method based on karst landform - Google Patents
Diversion tunnel plugging structure and method based on karst landform Download PDFInfo
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- CN108316260B CN108316260B CN201810169043.0A CN201810169043A CN108316260B CN 108316260 B CN108316260 B CN 108316260B CN 201810169043 A CN201810169043 A CN 201810169043A CN 108316260 B CN108316260 B CN 108316260B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 208
- 239000010959 steel Substances 0.000 claims abstract description 208
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000004567 concrete Substances 0.000 claims abstract description 65
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 19
- 238000010276 construction Methods 0.000 claims description 34
- 238000003466 welding Methods 0.000 claims description 22
- 238000009434 installation Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 6
- 239000004746 geotextile Substances 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 238000009432 framing Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 description 5
- 238000012876 topography Methods 0.000 description 5
- 238000003860 storage Methods 0.000 description 3
- 239000011440 grout Substances 0.000 description 2
- 239000011382 roller-compacted concrete Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
- E02B9/02—Water-ways
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/16—Sealings or joints
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The invention provides a diversion tunnel plugging structure and a diversion tunnel plugging method based on karst landform, wherein a first section of temporary plug, a second section of temporary plug and a permanent plug are sequentially arranged in a concrete lining of an original diversion tunnel along the water flow direction; the water retaining steel gate is installed at the upstream of the first section temporary plug, the stop beam gate is installed behind the water retaining steel gate, the stop beam gate is positioned in a matched mode through a plurality of stand columns, a bottom layer drainage steel pipe and a top layer drainage steel pipe are arranged at the bottom of a concrete lining of an original diversion tunnel in a stacked mode, a first butterfly valve is installed at a water outlet of the top layer drainage steel pipe, and a second butterfly valve and a third butterfly valve which are arranged at intervals are installed at a water outlet of the bottom layer drainage steel pipe. By adopting the hydraulic power station diversion tunnel plugging structure, the diversion tunnel can be effectively plugged, and the safety of a dam is further ensured.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering construction, and particularly relates to a diversion tunnel plugging structure and method based on karst landforms.
Background
The Mo Gukou sub hydropower station engineering dam site is positioned on the leather perfume river at the upstream of the north-dish river main flow, is the 4 th level of hydropower development of the north-dish river main flow, has a large (2) engineering scale, and mainly comprises the following main buildings: the device comprises a roller compacted concrete arch dam, a dam top overflow surface hole, an energy dissipation water pond, a dam body sand flushing middle hole, a water diversion system, a ground factory building, a switching station and the like.
The normal water storage level elevation 1450 m of the reservoir, the dam top elevation 1452.50m and the maximum dam height 167.5 m are the highest roller compacted concrete double arch dam currently under construction, the total reservoir capacity of the reservoir is 2.793 multiplied by 108m3, the installed capacity of a power station is 180MW (2 multiplied by 90 MW), and the annual average power generation capacity is 7.1 hundred million KW.h. The diversion tunnel is positioned on the left bank, the cross section is in the shape of a gate, the tunnel diameter is generally 4.5 multiplied by 6.0m (width multiplied by height), the maximum tunnel diameter of the plug section is 5.5 multiplied by 7.2m (width multiplied by height), the inlet bottom plate height is 1300.10m, the outlet bottom plate height is 1297.10m, and the whole tunnel body length is 893.10m.
The gate is opened in 2 months and 9 days of 2017 of the entrance gate of the diversion tunnel, water seepage occurs in surrounding rock of the body of the diversion tunnel in 2 months and 11 days, 3 concentrated water gushing points occur in 0+080-0+120 sections, the water gushing points are positioned on the right side wall and the top arch, the water gushing amount is continuously increased along with the rise of the water level of the storage, and the maximum flow rate of 3 months and 23 days is about 14.1m 3 The average flow rate is about 0.895m/s, and the water leakage amount is 13-14.1 m along with the fluctuation of the water level of the upstream reservoir 3 Between/s, the depth of water in the hole is about 3m, and the water level at the outlet is Cheng Yao m 1300m. The water depth in the diversion tunnel is rapid, the construction surface is narrow, the plug plugging has great potential safety hazards in construction, and meanwhile, the problems of material transportation, temporary drainage, concrete pouring, stable plug structure and the like are faced, and the plugging is extremely difficult.
Disclosure of Invention
In the face of the severe situations of prominent potential safety hazards, short construction period and high construction difficulty of the diversion tunnel, after the overall stability problem of the diversion tunnel and the change rule of the flow velocity in the tunnel are deeply analyzed, the principle of taking the blocking in the tunnel as the main and the anti-seepage out of the tunnel as the auxiliary is formulated, the blocking scheme of adopting the temporary plug and the permanent plug is determined, and the diversion tunnel can be effectively blocked by adopting the hydropower station diversion tunnel blocking structure, so that the safety of a dam is ensured.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: the diversion tunnel plugging structure based on karst landform is characterized in that a first section of temporary plug, a second section of temporary plug and a permanent plug are sequentially arranged in a concrete lining of an original diversion tunnel along the water flow direction; the water retaining steel gate is installed at the upstream of the first section temporary plug, the stop beam gate is installed behind the water retaining steel gate, the stop beam gate is positioned in a matched mode through a plurality of stand columns, a bottom layer drainage steel pipe and a top layer drainage steel pipe are arranged at the bottom of a concrete lining of an original diversion tunnel in a stacked mode, a first butterfly valve is installed at a water outlet of the top layer drainage steel pipe, and a second butterfly valve and a third butterfly valve which are arranged at intervals are installed at a water outlet of the bottom layer drainage steel pipe.
The inside of the original diversion tunnel is provided with a pedestrian passageway for transporting equipment and materials required in the tunnel, the pedestrian passageway comprises a full-hall steel pipe support erected from a tunnel portal to a temporary plug of a first section, and the full-hall steel pipe support comprises a left-width transportation passageway for transporting steel pipes and section steel of a large handcart; an intermediate passage for pedestrian traffic; right-web channels for arranging air supply pipes and pump pipes.
The water retaining steel gate comprises a gate plate stand column, the gate plate stand column adopts channel steel, the gate plate stand column is fixed on a concrete lining through a plurality of evenly distributed dowel bars, a steel plate door is installed on the gate plate stand column in a sliding fit mode, cross ribs are welded on one surface of the steel plate door, a tripod is welded on the top of the steel plate door, and the top of the tripod is connected with a traction device through a lifting hook and used for controlling the lowering of the steel plate door.
The traction device comprises a traction steel wire rope, the traction steel wire rope bypasses a fixed pulley, the fixed pulley is arranged at the middle position of a top cross beam, the top cross beam is fixedly arranged at the top of a concrete lining, the traction steel wire rope penetrates through a steel wire rope sleeve, and the tail end of the traction steel wire rope is fixedly positioned on the side wall of the concrete lining through a fixed joint.
The scaffold working platform is arranged on the side wall of the concrete lining, three layers are arranged on the scaffold working platform, the first layer of platform is used as a drainage steel pipe assembly platform, the platform surface is at least 0.5m higher than the water surface, the second layer of platform is used as a concrete warehouse-in platform, the platform surface is at least 1.5m higher than the first layer of platform surface, and the third layer of platform is used as a reinforcing platform.
The top of the bottom drainage steel pipe and the top drainage steel pipe inside the second section temporary plug are provided with cavity templates, and a reserved grouting cavity is arranged at the bottom of the tail end of the top drainage steel pipe.
The position of the reserved grouting cavity is provided with a plurality of submerged pumps, the drainage pump pipe of each submerged pump extends to the position of the permanent plug, the position of the reserved grouting cavity is communicated with a drainage pipe, and both ends of the position of the drainage pipe are provided with bulk cement bag cofferdams.
The stop-beam door is divided into an upper part and a lower part, the two parts are respectively stacked by a plurality of section steel, and a section steel seam is subjected to full welding.
The permanent plugs are grouting plugs by using a permanent curtain.
The diversion tunnel plugging structure based on karst landform of any one, which comprises the following steps:
step1, constructing a construction channel and a scaffold work platform: in order to quickly reach a working face, the construction road is determined by comprehensively considering factors such as equipment material transportation, pipeline laying, a safety evacuation channel and the like, a full-hall steel pipe bracket is erected from a hole to a temporary plug, a left frame is used as a transportation channel, and a steel template is laid on the whole line; the right width is fully paved with a bamboo pedal, and an air supply pipe and a pump pipe are arranged close to the side wall; the middle is used as a pedestrian passageway; setting up three layers of scaffold construction platforms, wherein a first layer of platform is used as a drainage steel pipe assembly platform, a second layer of platform is used as a concrete warehousing platform, and a third layer of platform is used as a reinforcing platform;
step2, installing a water retaining steel gate: firstly, installing two door plate stand columns at the opening of a diversion tunnel as guide rails of a steel plate door, then installing fixed pulleys, isolating and protecting a traction steel wire rope by using a steel wire rope sleeve, enabling the steel wire rope sleeve to pass through a first section temporary plug, fixing the downstream end of the steel wire rope sleeve on a right side wall through a fixed joint, and hooking a tripod at the top of the steel plate door by the traction steel wire rope;
step3, installing a stoplog door, firstly installing a portal steel frame, hanging a hoist on a beam, welding 3 upright posts in the middle with transverse cushion tube section steel into a whole, manually matching the hoist to be in place, welding stoplog door limiting section steel at a certain distance from the water surface, splicing the stoplog door above the limiting section steel, manufacturing the stoplog door at an upper part and a lower part, fully welding section steel seams, placing an upstream first part of the stoplog door by using the hoist after a drainage steel pipe is in place, enabling the stoplog door to cling to the section steel upright posts at the top of the drainage pipe under the assistance of water thrust and manual work, welding and reinforcing, placing a downstream second part of the stoplog door, welding the two parts into a whole, and finally stacking the rest vacant section steel to the hole top by using section steel;
step4, manufacturing and installing a bottom drainage steel pipe and a top drainage steel pipe, adopting a full framing, accurately positioning a vertical pipe according to the interval between the drainage steel pipes, vertically dividing the vertical pipe into three layers, welding the drainage pipe with two side wall dowel bars, fully paving a steel template as a drainage pipe assembly platform, assembling the drainage steel pipes again, welding the four drainage steel pipes into a whole by using profile steel after the assembly of the four drainage steel pipes is completed, lifting the whole by using a hoist, and integrally putting the four drainage steel pipes into water for positioning;
step5, pouring concrete of the temporary plugs of the first section, firstly treating a foundation surface, adopting an electric hammer to perform manual roughening treatment, then installing a water stop and a template, using a stop beam door as a cofferdam at the upstream end, grouting and plugging intervals between drain pipes and two side surfaces by using film bags, and then using geotextile and cotton wadding to form a seam; the downstream end template adopts a combined steel template, membrane bags are arranged between drain pipes at intervals in front of the template, cotton wool is used for plugging seams, geotextiles are used for covering, and bagged cement is piled up to serve as a downstream cofferdam; filling backfill grouting and joint grouting pipelines in advance at the periphery of the tunnel wall, wherein the backfill grouting pipelines are uniformly arranged along the top arch contour line; after the foundation surface, the water stop, the template and the embedded grouting pipe are inspected and accepted, concrete pouring is carried out, and then pouring and plugging of the temporary plug of the first section are completed;
step6, closing the first butterfly valve, the second butterfly valve and the third butterfly valve, and closing the bottom layer drainage steel pipe and the top layer drainage steel pipe;
step7, pouring concrete of the temporary plug of the second section, closing a butterfly valve of the drain pipe, grouting and water shutoff treatment, and adopting drainage measures; two small cofferdams are arranged in the bin, a water collecting cavity is arranged above the upstream cofferdam, a steel frame is arranged in the water collecting cavity, a pipe shed is manufactured, a bottom template is laid, a drain pipe is arranged in the bin, and a submersible pump is arranged in the bin to drain water leaking from the water collecting cavity; pouring by using a concrete through bin, pouring from downstream to upstream, and pouring by adopting a first-stage micro-expansion pumping concrete; after the strength of the concrete meets the requirement, firstly performing grouting treatment by filling the top with grout and performing contact grouting treatment, then closing a drain pipe gate, and performing backfilling grouting treatment on the water collecting cavity;
step8, constructing a permanent plug, namely after finishing the construction of the temporary plug, providing dry construction conditions, and performing the following procedures in the permanent plug concrete engineering: the method comprises the steps of bedrock surface treatment, steel bar installation, template installation, embedded part installation, cooling water pipe laying, concrete pouring, maintenance, grouting gallery formation, concreting curtain grouting, backfill gallery concrete, water cooling and joint grouting, wherein the concrete is poured by adopting a first-stage micro-expansion pumping concrete.
The invention has the following beneficial effects:
1. the construction risk of the temporary plug of the diversion tunnel of the Mo Gukou sub-hydropower station is extremely high, the topography, geology and hydrologic condition characteristics of the diversion tunnel of the ten thousand family of hydropower stations are combined, the construction scheme of the temporary plug is researched, and the maximum flow is about 14.1m 3 And/s, under the condition that the average flow speed is about 0.895m/s and the water depth is about 3m, the temporary plug construction scheme that the water retaining steel gate is closed by being matched with a butterfly valve and the profile steel stop-beam gate is used as a safety guarantee and is used as a water stop, a template and underwater concrete pouring is also used, the success of temporary plug plugging is ensured, and a dry condition plugging effect is created for permanent plug construction.
2. The invention establishes the diversion tunnel plugging structure of the hydropower station adapting to the topography and topography based on the characteristics of the karst topography, ensures the construction safety, and provides good technical guidance for the subsequent plugging of the diversion tunnel.
3. The diversion tunnel plugging construction method is low in construction cost, short in construction period and high in safety.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of the overall structure of the plugging structure of the present invention.
Fig. 2 is a top view of a first stage temporary bulkhead of the invention.
Fig. 3 is a front view of a first segment temporary plug of the present invention.
Fig. 4 is a view B-B of fig. 3 in accordance with the present invention.
Fig. 5 is a view showing a state of the present invention when water is retained under the water retaining steel gate.
Fig. 6 is an enlarged view of part of a of fig. 2 in accordance with the present invention.
Fig. 7 is a partial installation view of the fixed joint of the present invention.
Fig. 8 is a schematic view of a structure of a stop log door according to the present invention.
In the figure: the water retaining steel gate 1, the fixed pulley 2, the top cross beam 3, the stop beam gate 4, the steel wire rope sleeve 5, the traction steel wire rope 6, the first section temporary plug 7, the fixed joint 8, the second section temporary plug 9, the permanent plug 10, the drainage pump pipe 11, the upright post 12, the top layer drainage steel pipe 13, the bottom layer drainage steel pipe 14, the concrete lining 15, the cavity template 16, the first butterfly valve 17, the second butterfly valve 18, the cavity 19, the third butterfly valve 20, the reserved grouting submersible pump 21, the bulk cement bag cofferdam 22 and the drainage pipe 23;
door panel column 101, dowel bar 102, steel plate door 103, cross rib 104, tripod 105, lifting hook 106.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-8, a diversion tunnel plugging structure based on karst topography is provided with a first section temporary plug 7, a second section temporary plug 9 and a permanent plug 10 in sequence along the water flow direction inside a concrete lining 15 of an original diversion tunnel; the water retaining steel gate 1 is installed at the upstream of the first section temporary plug 7, the stop beam gate 4 is installed behind the water retaining steel gate 1, the stop beam gate 4 is cooperatively positioned through a plurality of upright posts 12, a bottom layer drainage steel pipe 14 and a top layer drainage steel pipe 13 are arranged at the bottom of a concrete lining 15 of an original diversion tunnel, the two layers of drainage steel pipes are stacked, a first butterfly valve 17 is installed at a water outlet of the top layer drainage steel pipe 13, and a second butterfly valve 18 and a third butterfly valve 20 which are arranged at intervals are installed at a water outlet of the bottom layer drainage steel pipe 14. By adopting the diversion tunnel plugging structure, the diversion tunnel can be plugged rapidly.
Further, a pedestrian passageway for transporting equipment and materials required in the tunnel is arranged in the original diversion tunnel, the pedestrian passageway comprises a full-hall steel pipe support erected from the tunnel opening to the temporary plug 7 of the first section, and the full-hall steel pipe support comprises a left-width transportation passageway for transporting steel pipes and section steel of a large handcart; an intermediate passage for pedestrian traffic; right-web channels for arranging air supply pipes and pump pipes. The working efficiency can be improved through the pedestrian passageway.
Further, the water retaining steel gate 1 comprises a gate plate upright post 101, the gate plate upright post 101 adopts channel steel, the gate plate upright post 101 is fixed on a concrete lining 15 through a plurality of evenly distributed dowel bars 102, a steel plate door 103 is installed on the gate plate upright post 101 in a sliding fit mode, a cross rib 104 is welded on one surface of the steel plate door 103, a tripod 105 is welded on the top of the steel plate door 103, and the top of the tripod 105 is connected with a traction device through a lifting hook 106 and controls the lowering of the steel plate door 103. Before the drain pipe valve needs to be closed, the water retaining steel gate 1 is put down, so that the flow in the bottom drain steel pipe 14 and the top drain steel pipe 13 is reduced, and the problem that 12 butterfly valves are difficult to close under water is solved.
Further, the traction device comprises a traction steel wire rope 6, the traction steel wire rope 6 bypasses the fixed pulley 2, the fixed pulley 2 is arranged at the middle position of the top cross beam 3, the top cross beam 3 is fixedly arranged at the top of the concrete lining 15, the traction steel wire rope 6 penetrates through the steel wire rope sleeve 5, and the tail end of the traction steel wire rope 6 is fixedly positioned on the side wall of the concrete lining 15 through the fixed joint 8. The water blocking standard of the stop beam door is calculated according to a water head of 70m, the temporary water blocking highest water level 1370m meets the flood control requirement in the dead water period, the stop beam door is arranged at the position of 0+384.5, the position is defined by a lining section of a diversion tunnel and an unlined section, a concrete lining protrudes to form a 'ridge', 5 pieces of worker 32 steel are vertically installed at the 'ridge' position to serve as stand columns, and the worker 32 steel is transversely overlapped and welded in front of the stand columns to form a sealed 'worker steel wall'. Creating a safe environment for manufacturing, installing and concrete construction of the drainage steel pipe.
Further, the side wall of the concrete lining 15 is provided with three scaffold working platforms, the scaffold working platforms are three layers, the first layer of platform is used as a drainage steel pipe assembly platform, the platform surface is at least 0.5m higher than the water surface, the second layer of platform is used as a concrete storage platform, the platform surface is at least 1.5m higher than the first layer of platform surface, and the third layer of platform is used as a reinforcing platform.
Further, cavity templates 16 are arranged at the tops of the bottom-layer drainage steel pipes 14 and the top-layer drainage steel pipes 13 inside the second section temporary plugs 9, and reserved grouting cavities 19 are arranged at the bottom positions of the tail ends of the top-layer drainage steel pipes 13.
Further, a plurality of submerged pumps 21 are arranged at the position of the reserved grouting cavity 19, the water discharge pump pipe 11 of the submerged pumps 21 extends to the position of the permanent plug 10, a water discharge pipe 23 is communicated with the position of the reserved grouting cavity 19, and bulk cement bag cofferdams 22 are arranged at two ends of the position of the water discharge pipe 23. By arranging the reserved grouting cavity 19, part of water leakage can be directly collected in the reserved grouting cavity 19 in the construction process of the first section temporary plug 7, and the water leakage can be discharged through the water discharge pump pipe 11 of the submersible pump 21.
Furthermore, the stop-beam door 4 is divided into an upper part and a lower part, the two parts are respectively stacked by a plurality of section steel, and the section steel seams are fully welded. The manufacturing efficiency is improved by adopting the upper part and the lower part, and the construction progress is quickened. The purpose of installing the stop log door is to create a safe environment for manufacturing, installing and concrete construction of the drainage steel pipe.
Further, the permanent plug 10 is a permanent curtain grouting plug. By adopting the permanent curtain grouting plug, the diversion tunnel can be completely and permanently plugged, so that the diversion tunnel is plugged, and the safety of a dam is ensured.
Example 2:
the diversion tunnel plugging structure based on karst landform of any one, which comprises the following steps:
step1, constructing a construction channel and a scaffold work platform: in order to quickly reach a working face, the construction road is determined by comprehensively considering factors such as equipment material transportation, pipeline laying, a safety evacuation channel and the like, a full-hall steel pipe bracket is erected from a hole to a temporary plug, a left frame is used as a transportation channel, and a steel template is laid on the whole line; the right width is fully paved with a bamboo pedal, and an air supply pipe and a pump pipe are arranged close to the side wall; the middle is used as a pedestrian passageway; setting up three layers of scaffold construction platforms, wherein a first layer of platform is used as a drainage steel pipe assembly platform, a second layer of platform is used as a concrete warehousing platform, and a third layer of platform is used as a reinforcing platform;
step2, installing a water retaining steel gate: firstly, installing two door plate upright posts 101 at the opening of a diversion tunnel as guide rails of a steel plate door 103, installing fixed pulleys 2, isolating and protecting a traction steel wire rope 6 by using a steel wire rope sleeve 5, enabling the steel wire rope sleeve 5 to pass through a first section temporary plug 7, fixing the downstream end of the steel wire rope sleeve 5 on a right side wall through a fixed joint 8, and hooking a tripod 105 at the top of the steel plate door 103 by the traction steel wire rope 6;
step3, installing a stoplog door, firstly installing a portal steel frame, hanging a hoist on a beam, welding the middle 3 upright posts 12 and transverse cushion tube section steel into a whole, manually matching the hoist to be in place, welding stoplog door limiting section steel at a certain distance from the water surface, splicing the stoplog door above the limiting section steel, manufacturing the stoplog door at an upper part and a lower part, fully welding section steel seams, placing an upstream first part of the stoplog door by using the hoist after a drainage steel pipe is in place, tightly attaching the stoplog door to the section steel upright posts at the top of the drainage pipe under the assistance of water thrust and manual work, welding and reinforcing, placing a downstream second part of the stoplog door, welding the two parts into a whole, and finally overlapping the rest vacant position to the hole top by using section steel;
step4, manufacturing and installing a bottom drainage steel pipe 14 and a top drainage steel pipe 13, adopting a full framing, accurately positioning a vertical pipe according to the interval between the drainage steel pipes, vertically dividing the drainage steel pipes into three layers, welding the drainage steel pipes with two side wall dowel bars, fully paving steel templates as drainage pipe assembly platforms, assembling the drainage steel pipes again, welding the four drainage steel pipes into a whole by using profile steel after the assembly of the four drainage steel pipes is completed, lifting the whole by using a hoist, and integrally putting the four drainage steel pipes into water for positioning;
step5, pouring concrete of the first section temporary plug 7, firstly treating a foundation surface, adopting an electric hammer to perform manual roughening treatment, then installing a water stop and a template, using a stop beam door as a cofferdam at the upstream end, grouting and plugging a gap between drain pipes and two side surfaces by using a membrane bag, and then using geotextile and cotton plug seams; the downstream end template adopts a combined steel template, membrane bags are arranged between drain pipes at intervals in front of the template, cotton wool is used for plugging seams, geotextiles are used for covering, and bagged cement is piled up to serve as a downstream cofferdam; filling backfill grouting and joint grouting pipelines in advance at the periphery of the tunnel wall, wherein the backfill grouting pipelines are uniformly arranged along the top arch contour line; after the foundation surface, the water stop, the template and the embedded grouting pipe are inspected and accepted, concrete pouring is carried out, and then pouring and plugging of the first section temporary plug 7 are completed;
step6, closing the first butterfly valve 17, the second butterfly valve 18 and the third butterfly valve 20, and closing the bottom-layer drain steel pipe 14 and the top-layer drain steel pipe 13;
step7, pouring concrete of the temporary plug 9 of the second section, closing a butterfly valve of the drain pipe, and taking drainage measures after grouting and water shutoff treatment; two small cofferdams are arranged in the bin, a water collecting cavity is arranged above the upstream cofferdam, a steel frame is arranged in the water collecting cavity, a pipe shed is manufactured, a bottom template is laid, a drain pipe 23 and a submersible pump 21 are arranged in the bin to drain water in the water collecting cavity; pouring by using a concrete through bin, pouring from downstream to upstream, and pouring by adopting a first-stage micro-expansion pumping concrete; after the strength of the concrete meets the requirement, firstly performing grouting treatment by filling the top with grout and performing contact grouting treatment, then closing a drain pipe gate, and performing backfilling grouting treatment on the water collecting cavity;
step8, constructing a permanent plug 10 plug, and after finishing the temporary plug construction, carrying out the concrete engineering of the permanent plug under the dry construction condition according to the following procedures: the method comprises the steps of bedrock surface treatment, steel bar installation, template installation, embedded part installation, cooling water pipe laying, concrete pouring, maintenance, grouting gallery formation, concreting curtain grouting, backfill gallery concrete, water cooling and joint grouting, wherein the concrete is poured by adopting a first-stage micro-expansion pumping concrete.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (5)
1. The diversion tunnel plugging method based on karst landform is characterized by comprising the following steps of: the method is realized by adopting a diversion tunnel plugging structure based on karst landforms, and the diversion tunnel plugging structure based on the karst landforms is as follows: a first section temporary plug (7), a second section temporary plug (9) and a permanent plug (10) are sequentially arranged in a concrete lining (15) of the original diversion tunnel along the water flow direction; a water retaining steel gate (1) is installed at the upstream of a first section temporary plug (7), a stoplog gate (4) is installed behind the water retaining steel gate (1), the stoplog gate (4) is positioned in a matched mode through a plurality of stand columns (12), a bottom layer drainage steel pipe (14) and a top layer drainage steel pipe (13) are arranged at the bottom of a concrete lining (15) of an original diversion tunnel, the two layers of drainage steel pipes are stacked, a first butterfly valve (17) is installed at a water outlet of the top layer drainage steel pipe (13), and a second butterfly valve (18) and a third butterfly valve (20) which are arranged at intervals are installed at a water outlet of the bottom layer drainage steel pipe (14);
the water retaining steel gate (1) comprises a gate plate upright post (101), the gate plate upright post (101) adopts channel steel, the gate plate upright post (101) is fixed on a concrete lining (15) through a plurality of evenly distributed dowel bars (102), a steel plate door (103) is installed on the gate plate upright post (101) in a sliding fit manner, a cross rib (104) is welded on one surface of the steel plate door (103), a tripod (105) is welded on the top of the steel plate door (103), and the top of the tripod (105) is connected with a traction device through a lifting hook (106) and controls the lowering of the steel plate door (103);
the traction device comprises a traction steel wire rope (6), wherein the traction steel wire rope (6) bypasses a fixed pulley (2), the fixed pulley (2) is arranged in the middle of a top cross beam (3), the top cross beam (3) is fixedly arranged at the top of a concrete lining (15), the traction steel wire rope (6) passes through a steel wire rope sleeve (5), and the tail end of the traction steel wire rope (6) is fixedly positioned on the side wall of the concrete lining (15) through a fixed joint (8);
the top of the bottom layer drainage steel pipe (14) and the top layer drainage steel pipe (13) in the second section temporary plug (9) are provided with cavity templates (16), and a reserved grouting cavity (19) is arranged at the bottom of the tail end of the top layer drainage steel pipe (13);
the novel grouting device is characterized in that a plurality of submersible pumps (21) are arranged at the position of the reserved grouting cavity (19), a drainage pump pipe (11) of each submersible pump (21) extends to the position of a permanent plug (10), a drainage pipe (23) is communicated with the position of the reserved grouting cavity (19), and bulk cement bag cofferdams (22) are arranged at two ends of the position of the drainage pipe (23);
the diversion tunnel plugging method comprises the following steps:
step1, constructing a construction channel and a scaffold work platform: for rapidly reaching a working face, the construction road is determined by comprehensively considering factors of equipment material transportation, pipeline laying and a safety evacuation channel, a full-hall steel pipe bracket is erected from a hole to a temporary plug, a left frame is used as a transportation channel, and a steel template is laid on the whole line; the right width is fully paved with a bamboo pedal, and an air supply pipe and a pump pipe are arranged close to the side wall; the middle is used as a pedestrian passageway; setting up three layers of scaffold construction platforms, wherein a first layer of platform is used as a drainage steel pipe assembly platform, a second layer of platform is used as a concrete warehousing platform, and a third layer of platform is used as a reinforcing platform;
step2, installing a water retaining steel gate: firstly, installing two door plate upright posts (101) at the opening of a diversion tunnel, serving as guide rails of a steel plate door (103), installing fixed pulleys (2), isolating and protecting a traction steel wire rope (6) by using a steel wire rope sleeve (5), enabling the steel wire rope sleeve (5) to pass through a first section temporary plug (7), enabling the downstream end to be fixed on a right side wall through a fixed joint (8), and hooking a tripod (105) at the top of the steel plate door (103) by using the traction steel wire rope (6);
step3, installing a stop girder door, firstly installing a portal steel frame, hanging a hoist on a beam, welding 3 upright posts (12) in the middle with transverse cushion tube section steel into a whole, manually matching the hoist to be in place, welding stop girder door limiting section steel at a certain distance from the water surface, splicing the stop girder door above the limiting section steel, manufacturing the stop girder door by an upstream part and a downstream part, fully welding section steel seams, placing an upstream first part of the stop girder door by the hoist after a drainage steel pipe is in place, enabling the stop girder door to cling to the section steel upright posts at the top of the drainage pipe under the assistance of water thrust and manual work, welding and reinforcing, placing a downstream second part of the stop girder door, welding the two parts into a whole, and finally folding the rest vacant section steel to the top of a hole;
step4, manufacturing and installing a bottom drainage steel pipe (14) and a top drainage steel pipe (13), adopting a full framing, accurately positioning a vertical pipe according to the distance between the drainage steel pipes, vertically dividing the drainage steel pipes into three layers, welding the drainage steel pipes with two side wall dowel bars, fully paving steel templates as a drainage pipe assembly platform, assembling the drainage steel pipes again, welding the four drainage steel pipes into a whole by using profile steel after assembling, integrally lifting by using a hoist, and integrally putting the four drainage steel pipes into water for positioning;
step5, pouring concrete of a first section temporary plug (7), firstly treating a foundation surface, adopting an electric hammer to perform manual roughening treatment, then installing a water stop and a template, using a stop beam door as a cofferdam at the upstream end, grouting and plugging a gap between drain pipes and two side surfaces by using a membrane bag, and then using geotextile and cotton plug seams; the downstream end template adopts a combined steel template, membrane bags are arranged between drain pipes at intervals in front of the template, cotton wool is used for plugging seams, geotextiles are used for covering, and bagged cement is piled up to serve as a downstream cofferdam; filling backfill grouting and joint grouting pipelines in advance at the periphery of the tunnel wall, wherein the backfill grouting pipelines are uniformly arranged along the top arch contour line; after the foundation surface, the water stop, the template and the embedded grouting pipe are inspected and accepted, concrete pouring is carried out, and then pouring and plugging of the first section temporary plug (7) is completed;
step6, closing the first butterfly valve (17), the second butterfly valve (18) and the third butterfly valve (20) to close the bottom-layer drainage steel pipe (14) and the top-layer drainage steel pipe (13);
step7, pouring concrete of the temporary plug (9) of the second section, closing a butterfly valve of the drain pipe, and taking drainage measures after grouting and water shutoff treatment; two small cofferdams are arranged in the bin, a water collecting cavity is arranged above the upstream cofferdam, a steel frame is arranged in the water collecting cavity, a pipe shed is manufactured, a bottom template is laid, a drain pipe (23) is arranged in the bin, and a submersible pump (21) is arranged in the bin to drain water leaking from the water collecting cavity; pouring by using a concrete through bin, pouring from downstream to upstream, and pouring by adopting a first-stage micro-expansion pumping concrete; after the strength of the concrete meets the requirement, firstly performing top backfill grouting and contact grouting treatment, then closing a drain pipe gate, and performing backfill grouting treatment on the water collecting cavity;
step8, constructing a permanent plug (10), wherein after the temporary plug construction is completed, the construction condition of a dry land is provided, and the construction of the permanent plug concrete engineering is carried out according to the following procedures: the method comprises the steps of bedrock surface treatment, steel bar installation, template installation, embedded part installation, cooling water pipe laying, concrete pouring, maintenance, grouting gallery formation, concreting curtain grouting, backfill gallery concrete, water cooling and joint grouting, wherein the concrete is poured by adopting a first-stage micro-expansion pumping concrete.
2. The karst landform-based diversion tunnel plugging method according to claim 1, wherein the method comprises the following steps: the inside of the original diversion tunnel is provided with a pedestrian passageway for transporting equipment and materials required in the tunnel, the pedestrian passageway comprises a full-hall steel pipe support erected from a tunnel portal to a temporary plug (7) of a first section, and the full-hall steel pipe support comprises a left-width transportation passageway for transporting steel pipes and section steel of a large handcart; an intermediate passage for pedestrian traffic; right-web channels for arranging air supply pipes and pump pipes.
3. The karst landform-based diversion tunnel plugging method according to claim 1, wherein the method comprises the following steps: the side wall of the concrete lining (15) is provided with a scaffold working platform, the scaffold working platform is three layers in total, a first layer of platform is used as a drainage steel pipe assembly platform, the platform surface is at least 0.5m higher than the water surface, a second layer of platform is used as a concrete warehousing platform, the platform surface is at least 1.5m higher than the first layer of platform surface, and a third layer of platform is used as a reinforcing platform.
4. The karst landform-based diversion tunnel plugging method according to claim 1, wherein the method comprises the following steps: the stop-beam door (4) is divided into an upper part and a lower part, the two parts are respectively stacked by a plurality of section steel, and a section steel seam is fully welded.
5. The karst landform-based diversion tunnel plugging method according to claim 1, wherein the method comprises the following steps: the permanent plugs (10) are grouting plugs by adopting a permanent curtain.
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