CN109469498B - Mounting structure of lining steel pipe in narrow space of water delivery tunnel and construction method of mounting structure - Google Patents
Mounting structure of lining steel pipe in narrow space of water delivery tunnel and construction method of mounting structure Download PDFInfo
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- CN109469498B CN109469498B CN201811628434.0A CN201811628434A CN109469498B CN 109469498 B CN109469498 B CN 109469498B CN 201811628434 A CN201811628434 A CN 201811628434A CN 109469498 B CN109469498 B CN 109469498B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 137
- 239000010959 steel Substances 0.000 title claims abstract description 137
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 40
- 238000009434 installation Methods 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims description 31
- 230000000149 penetrating effect Effects 0.000 claims description 27
- 239000004567 concrete Substances 0.000 claims description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000005498 polishing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 13
- 239000011449 brick Substances 0.000 description 5
- 238000005266 casting Methods 0.000 description 5
- 210000001624 hip Anatomy 0.000 description 5
- 239000011376 self-consolidating concrete Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 2
- 235000000396 iron Nutrition 0.000 description 2
- XEEYBQQBJWHFJM-OUBTZVSYSA-N iron-52 Chemical compound [57Fe] XEEYBQQBJWHFJM-OUBTZVSYSA-N 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
- E21D11/406—Placing endless lining elements, e.g. from reels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
-
- 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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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a water delivery tunnel narrow space lining steel pipe installation structure and a construction method thereof, wherein the water delivery tunnel narrow space lining steel pipe installation structure comprises a tunnel body, a propulsion system is arranged in the tunnel body, a propulsion device is arranged at a hole inlet of the tunnel body, the propulsion system comprises an in-tunnel rolling device and an in-tunnel guide rail device, the in-tunnel rolling device and the in-tunnel guide rail device are arranged at intervals in the tunnel body, and the in-tunnel rolling device comprises a pair of earrings symmetrically arranged at the bottom of the tunnel body, a steel shaft arranged between the earrings and a sleeve rotationally arranged on the steel shaft. The invention discloses a mounting structure for a lining steel pipe in a narrow space of a water conveying tunnel, which solves the problem of low mounting efficiency of the steel pipe in the narrow space of a straight tunnel.
Description
Technical Field
The invention relates to the technical field of installation of steel pipes in tunnels, in particular to a water delivery tunnel narrow space lining steel pipe installation structure and a construction method thereof.
Background
The water delivery tunnel is an important component in diversion and water diversion engineering, adopts multilayer lining at present, generally includes: outer liners such as shotcrete, duct pieces, and the like; liners such as steel tubing, PVC tubing, etc.; reinforced concrete filled between the outer liner and the inner liner, self-compacting concrete, and the like.
In order to save the manufacturing cost, the section of the tunnel is generally smaller, the conventional span of the tunnel is 3-4m, and the tunnel is small in section, so that the common mechanical equipment is difficult to transport and hoist steel pipes due to the small section of the tunnel, and the installation and the paving of the steel pipes in the tunnel are difficult. The conventional method is to transport and hoist steel pipes by adopting a mode of combining a winch with rolling bar traction or designing a special railway car, and the construction modes have the defects of low installation precision, troublesome arrangement of the winch and a guide system, complicated command operation, low transport efficiency, poor transport stability and the like.
Disclosure of Invention
The invention aims to provide a mounting structure for a lining steel pipe in a narrow space of a water delivery tunnel, which solves the problem of low mounting efficiency of the steel pipe in the narrow space of a straight tunnel.
The above object of the present invention is achieved by the following technical solutions:
the utility model provides a narrow space inside lining steel pipe mounting structure of water delivery tunnel, includes the tunnel hole body, be equipped with propulsion system in the tunnel hole body, the entrance to a cave of tunnel hole body is equipped with propulsion unit, propulsion system includes rolling device and in-hole guide rail device in the hole, rolling device and in-hole guide rail device interval arrangement in the tunnel hole body in the hole, rolling device is including the symmetry setting in a pair of earrings in tunnel hole body bottom, locate the steel axle between the earrings and rotate the sleeve of locating on the steel axle.
Through adopting above-mentioned technical scheme, propulsion unit provides propulsion for the steel pipe, supports after the steel pipe enters into tunnel hole body inside and presses on sleeve and steel shaft, becomes sliding friction rolling friction, makes the steel pipe install in the tunnel hole body can be quick smooth to the problem that the steel pipe installation effectiveness is low in the narrow space of straight tunnel has been solved, rolling friction has effectively reduced the wearing and tearing of steel pipe in the propulsion simultaneously.
The invention is further provided with: the guide rail device in the hole consists of two guide rails, and the guide rails are formed by butt welding of two channel steels.
Through adopting above-mentioned technical scheme, the guide rail plays the spacing effect of direction at the in-process of steel pipe transportation to guarantee the installation quality of steel pipe.
The invention is further provided with: the length of the guide rail device in the tunnel is 30cm, a group of rolling devices in the tunnel are arranged in the tunnel body every 1m, and a group of guide rail devices in the tunnel are arranged every 3 m.
The invention is further provided with: the bottom of the tunnel body is provided with a pipe penetrating platform by adopting concrete casting, and the rolling device in the tunnel and the guide rail device in the tunnel are integrally cast in the pipe penetrating platform.
By adopting the technical scheme, the installation and fixation of the rolling device in the hole and the guide rail device in the hole are realized after the pipe penetrating platform is molded, and the construction of the propulsion system is completed.
The invention is further provided with: a supporting piece is integrally poured in the pipe penetrating platform, and earrings of the in-hole rolling device are symmetrically welded on two sides of the supporting piece; and lacing wires are arranged between two groups of guide rails of the guide rail device in the hole, and are erected on the supporting piece through the lacing wires.
By adopting the technical scheme, the position relationship between the in-hole rolling device and the in-hole guide rail device can be influenced by concrete in the pouring process, so that the transportation effect of the steel pipe is influenced, before the pipe penetrating platform is poured, supporting pieces are paved in the tunnel body along the length of the tunnel body, and the earrings of the in-hole rolling device are symmetrically welded on the two sides of the supporting pieces, so that the stability of the installation of the earrings is improved, the position change between the in-hole rolling devices is prevented, and the transportation effect of the steel pipe is ensured; the guide rail device in the hole is erected above the supporting piece through the lacing wire, so that position change between the guide rail devices in the hole is prevented, the guiding effect on the steel pipe is guaranteed, meanwhile, the lacing wire applies pulling force on the guide rail, and the installation effect of the guide rail is improved.
The invention is further provided with: and locating ribs are arranged at the tops and waists of the tunnel inside the tunnel body.
Through adopting above-mentioned technical scheme, the locating rib plays spacing effect to the steel pipe in the transportation, prevents that it from taking place the skew in the propulsion.
The invention is further provided with: the tunnel body advance the entrance to a cave and be equipped with pipeline installation system, pipeline installation system includes pipeline laying platform and the back of arranging outward in proper order from advancing the entrance to a cave, propulsion plant is located between pipeline laying platform and the back.
By adopting the technical scheme, the pipeline placing platform is used for placing the steel pipe, so that the steel pipe is aligned with the tunnel body, and the next propelling work can be conveniently carried out; the back provides supporting force for the propulsion equipment, so that the propulsion equipment can orderly and stably work during working, and the fluency of steel pipe installation is ensured.
The invention is further provided with: and one side of the pipeline placement platform facing the tunnel body entrance is provided with a welding working pit.
Through adopting above-mentioned technical scheme, two steel pipes butt joint back at present, need carry out comprehensive welding in mouth of pipe department, but the below exists unchanged when the welding because of the position reason, through setting up the welding work hole, makes the staff can more convenient weld, guarantees welding quality.
The invention further aims to provide a construction method of the installation structure of the lining steel pipe in the narrow space of the water delivery tunnel, and the steel pipe is rapidly installed in the tunnel body by using the construction method.
The above object of the present invention is achieved by the following technical solutions:
a construction method of a water delivery tunnel narrow space lining steel pipe installation structure comprises the following steps:
s1, constructing a propulsion system, arranging a supporting piece at the bottom of a tunnel body, wherein the supporting piece is selected as channel steel or square pipes, welding a group of earrings on two sides of the supporting piece at intervals of 1m, placing a group of guide rails at intervals of 3m, pouring concrete in the tunnel body, pouring the supporting piece in the concrete, enabling the upper surface of the supporting piece to be flush with the surface of the concrete, forming a pipe penetrating platform after the concrete is formed, sleeving a sleeve on a steel shaft, and placing the steel shaft in the earrings;
s2, installing phi 20 positioning ribs at the top and waist of the tunnel body, wherein the positioning ribs are fixed in the tunnel body in a rib planting mode, the spacing between the positioning ribs at the waist is 400cm, and the spacing between the positioning ribs at the top is 500cm;
s3, constructing a steel pipe installation system, pouring a pipeline placement platform at the position of a hole inlet of a tunnel body, burying a backing at one end of the pipeline placement platform far away from the hole inlet, and enabling a propelling device to lean against the backing, wherein the propelling device is two 320T hydraulic jack picks;
s4, a welding working pit is formed at one end of the pipeline placing platform facing the entrance through bricking;
s5, lifting the steel pipes to a pipeline placing platform by adopting an 80T crane, placing a mouth protecting iron at the pipe orifice of the steel pipe, pushing the steel pipe to move into a tunnel body by pushing the iron, stopping the pushing equipment when the pipe orifice of the current steel pipe is positioned in the middle of a welding working pit, removing the pushing iron, lifting the next steel pipe to the pipeline placing platform, butting the front steel pipe and the rear steel pipe, performing welding, polishing a welded junction at the bottom of the steel pipe after the welding is finished, enabling the welded junction to be flush and smooth with the bottom of the steel pipe, and then performing pushing operation again until the steel pipes are all in place;
s6, backfilling concrete between the tunnel body and the steel pipe.
Through adopting above-mentioned technical scheme, firstly install propulsion system stable in the tunnel hole body, then construction steel pipe installing the system, with the steel pipe handling in proper order on the steel pipe lay the platform outside the hole, adopt "welding while impels" mode with the steel pipe installation in the tunnel hole body.
The invention is further provided with: in S1, a total station is adopted to determine the position of the pipe penetrating platform before pouring of the pipe penetrating platform, a precise level is used for measuring the height of the pipe penetrating platform, and the height of the platform is controlled to be 1cm lower than the design bottom surface of the sleeve after the steel shaft is placed.
Through adopting above-mentioned technical scheme, use total powerstation to improve poling platform's pouring precision, platform height is less than the sleeve, guarantees that the sleeve can rotate, can not cause the interference to telescopic rotation.
In summary, the invention has the following beneficial effects:
1. by arranging the in-tunnel rolling device and the in-tunnel guide rail device in the tunnel body, the hydraulic jacking pick is adopted as the pushing equipment of the steel pipe, and the hydraulic jacking pick and the steel pipe are matched so as to be convenient for controlling the pushing speed of the steel pipe, so that the deviation in the pushing process can be corrected in time, and the steel pipe is quickly and smoothly arranged in the tunnel body;
2. the supporting piece is arranged in the tunnel body, and the in-tunnel rolling device and the in-tunnel guide rail device are arranged on the supporting piece at intervals, so that position change between the in-tunnel rolling device and the in-tunnel guide rail device is prevented, and the transportation effect of the steel pipe is ensured;
3. through setting up the location muscle in the tunnel portal, the location muscle plays spacing effect to the steel pipe, prevents that it from taking place the skew in the propulsion.
Drawings
FIG. 1 is a schematic diagram of the structure in an embodiment;
FIG. 2 is a schematic structural view of a propulsion system in an embodiment;
FIG. 3 is a schematic diagram of the piping installation system in an embodiment;
FIG. 4 is a schematic view of the structure of the pipe placement platform according to the embodiment;
FIG. 5 is a schematic diagram of the distribution of casting pipes and grouting pipes in an embodiment;
fig. 6 is a schematic view of the construction of a brick die in an embodiment.
In the figure, 1, a tunnel body; 11. a pipe penetrating platform; 12. a support; 13. positioning ribs; 14. a steel pipe; 2. an in-hole rolling device; 21. ear rings; 211. an arc-shaped groove; 22. a steel shaft; 23. a sleeve; 3. an in-hole guide rail device; 31. a guide rail; 32. lacing wires; 4. a pipeline placement platform; 41. a track foundation; 42. an out-hole track; 43. welding the working pit; 5. a propulsion device; 51. jacking iron; 52. iron for protecting mouth; 6. a back; 7. pouring a pipe; 71. a flashboard; 8. grouting pipe; 81. a blind plate; 82. grouting holes; 9. a brick mold structure; 91. and an exhaust pipe.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Examples: the utility model provides a narrow space inside lining steel pipe mounting structure of water delivery tunnel, as shown in fig. 1, includes tunnel shaft 1, propulsion system and pipeline installation system, and wherein propulsion system arranges in tunnel shaft 1, and pipeline installation system sets up in the entrance to the hole department of tunnel shaft 1.
As shown in fig. 1 and 2, the propulsion system comprises an in-hole rolling device 2 and an in-hole guide rail device 3, the in-hole rolling device 2 comprises earrings 21, a steel shaft 22 and a sleeve 23, the earrings 21 are of rectangular plate-shaped structures, two earrings 21 are in a group and symmetrically supported at the bottom of a tunnel body 1, an arc-shaped groove 211 is formed in the upper end of each earring 21, the sleeve 23 is sleeved on the steel shaft 22, and the steel shaft 22 is placed in the arc-shaped groove 211 to complete the assembly of the in-hole rolling device 2; wherein the diameter of the steel shaft 22 is 60mm and the diameter of the sleeve 23 is 75mm, the diameter of the arc-shaped groove 211 is adapted to the steel shaft 22. In order to ensure smoothness of rotation of the sleeve 23 on the steel shaft 22, lubricating oil may be applied between the sleeve 23 and the steel shaft 22. The in-hole guide rail device 3 is composed of two guide rails 31, each guide rail 31 is formed by butt welding two channel steel, and the length of the guide rail 31 is 30cm.
The bottom of the tunnel body 1 is poured with a pipe penetrating platform 11 (refer to fig. 1) by adopting C40 concrete, the in-tunnel rolling device 2 and the in-tunnel guide rail device 3 are integrally poured in the pipe penetrating platform 11, and after the pipe penetrating platform 11 is formed, the in-tunnel rolling device 2 and the in-tunnel guide rail device 3 are installed and fixed, so that the construction of a propulsion system is completed. The rolling device 2 in the hole is abducted when the pipe penetrating platform 11 is poured, so that the sleeve 23 can rotate around the steel shaft 22; the top of the guide rail 31 is higher than the top of the sleeve 23 after the tube passing platform 11 is formed.
The rolling devices 2 in the tunnel are arranged in the tunnel body 1 at intervals of 1m, the guide rail devices 3 in the tunnel are arranged in the tunnel body 1 at intervals of 3m, the rolling devices 2 in the tunnel and the guide rail devices 3 in the tunnel begin to pour the pipe penetrating platform 11 after being installed in the tunnel body 1, but the position relationship among the rolling devices 2 in the tunnel and the guide rail devices 3 in the tunnel can be influenced in the pouring process, so that the transportation effect of the steel pipes 14 is influenced, in order to weaken the influence of the problem, supporting pieces 12 are paved in the tunnel body 1 along the length of the pipe penetrating platform 11 before the pipe penetrating platform 11 is poured, and the supporting pieces 12 can be channel steel or square pipes.
The in-hole rolling devices 2 and the in-hole guide rail devices 3 are arranged on the supporting piece 12, and particularly as shown in fig. 2, the earrings 21 of each group of in-hole rolling devices 2 are symmetrically welded on two sides of the supporting piece 12, so that the stability of the installation of the earrings 21 is improved, the position change between the in-hole rolling devices 2 is prevented, and the transportation effect of the steel pipes 14 is ensured; the in-hole guide rail device 3 is provided with tie bars 32 at intervals between the two guide rails 31, two ends of the tie bars 32 are respectively welded on the side walls of the guide rails 31, and the two groups of guide rails 31 are erected above the supporting piece 12 through the tie bars 32, so that position change between the in-hole guide rail device 3 is prevented, the guide effect on the steel pipes 14 is ensured, meanwhile, the tie bars 32 apply pulling force on the guide rails 31, and the installation effect of the guide rails 31 is improved.
Before the pipe penetrating platform 11 is poured, the position of the pipe penetrating platform 11 is determined by using a total station, the height of the pipe penetrating platform 11 is measured by using a precise level gauge, and the top surface of the pipe penetrating platform 11 opposite to the in-hole rolling device 2 is controlled to be 1cm lower than the bottom surface of the sleeve 23 after the steel shaft 22 is placed.
Furthermore, in order to ensure the straightness of the sliding of the steel pipe 14 in the tunnel body 1, positioning ribs 13 (refer to fig. 1) are arranged at the top and waist of the tunnel inside the tunnel body 1, and the positioning ribs 13 are fixed on the tunnel body 1 in a reinforcement-planting manner; the spacing between the positioning ribs 13 at the top of the hole is 500cm, and the spacing between the positioning ribs 13 at the waist of the hole is 400cm. In the pushing process of the steel pipe 14, the positioning ribs 13 play a limiting role on the steel pipe 14, and the steel pipe 14 is prevented from shifting.
After the construction of the propulsion system is completed, the construction of the operation pipeline installation system is started. As shown in fig. 3, the pipe installation system includes a pipe placement platform 4, a pushing device 5 and a back 6, the pipe installation is pushed from the end point (entrance) of the tunnel body 1 to the start point direction, and the pipe placement platform 4, the pushing device 5 and the back 6 of the pipe installation system are sequentially arranged outward from the end point of the tunnel body 1.
As shown in fig. 4, the pipeline placement platform 4 includes a track foundation 41 formed by casting reinforced concrete, two sets of outer hole tracks 42 are integrally cast on the track foundation 41, and the outer hole tracks 42 are also formed by butt welding two channel steels. The support piece 12 is poured in the track foundation 41, tie bars 32 are arranged between the two groups of outer hole tracks 42 at intervals, the tie bars 32 are erected on the support piece 12, and stability of the outer hole tracks 42 is improved after the track foundation 41 is molded. The propulsion equipment 5 is selected as two hydraulic jack picks of 320T, the back 6 is selected as a reinforced concrete structure, the lower part is buried in the soil layer, and the upper part is exposed to the outside to provide supporting force for the propulsion equipment 5.
When the steel pipes 14 are installed, a first steel pipe 14 is lifted to the outer track 42 of the pipeline placement platform 4 through a crane, then a port protecting iron 52 (refer to fig. 3) is arranged at one end of the steel pipe 14 facing the propelling equipment 5, the propelling equipment 5 is abutted against the back 6, the port protecting iron 52 is pushed by the jacking irons 51 placed one by one when the propelling equipment 5 works so as to push the steel pipe 14 to gradually move towards the inside of the tunnel body 1, when the tail end of the steel pipe 14 quickly enters the tunnel body 1, the propelling equipment 5 stops working, then the jacking irons 51 are removed, the next steel pipe 14 is lifted to the pipeline placement platform 4 through the crane, and the front steel pipe and the rear steel pipe 14 are butted for welding; in order to ensure the welding effect of the two steel pipes 14, a welding working pit 43 is formed between the pipeline placement platform 4 and the end point of the tunnel body 1 in a bricked mode, so that a welding port is more comprehensive. And after the welding is finished, the weld joint is polished, so that the weld joint is flush with the bottom of the steel pipe 14 and smooth, and friction obstruction at the weld joint is eliminated. Then, the propelling operation is performed again, and the previous steel pipe 14 enters the tunnel body 1 and is transported by the rolling device 2 in the tunnel. By the same token, the steel pipes 14 are pushed into the tunnel body 1 one by one, so that the steel pipes 14 are quickly installed in the tunnel body 1, and the problem of low installation efficiency of the steel pipes 14 in a narrow space is solved.
When the steel pipe 14 is completely in place, self-compacting concrete needs to be backfilled between the steel pipe 14 and the tunnel body 1, the traditional backfilling self-compacting concrete method generally adopts sectional pouring or ground drilling pouring, the sectional pouring is influenced by the length of the tunnel, when the length of the tunnel is long, the pouring from two ends is only needed, the pouring of the ground drilling is influenced by the stratum at the top of the tunnel, if the stratum has shallow water stagnation, the water stagnation possibly enters an interlayer between the tunnel body 1 and the steel pipe 14 from the drilling. In order to avoid the problems, the two ends of the interlayer are blocked by bricks, the exhaust pipe 91 is pre-buried, the top of the steel pipe 14 is perforated, the pouring pipes 7 are welded for backfilling self-compacting concrete, meanwhile, the grouting pipes 8 are arranged between the pouring pipes 7, grouting is carried out after backfilling is finished, and backfilling is ensured to be compact.
Specifically, from the positions close to the two ends of the steel pipe 14, casting pipes 7 with the length of 150mm phi and 30mm are arranged every 20m, and three grouting pipes 8 with the wall thickness of 5mm phi and 100mm are arranged between adjacent casting pipes 7 at equal intervals; grouting pipes 8 near the two ends of the steel pipe 14 are arranged between the pouring pipe 7 and the pipe orifice of the steel pipe 14, and the concrete arrangement is shown in fig. 5.
When the pouring pipe 7 is welded on the top of the steel pipe 14, a connection hole with phi 150 is cut on the top of the steel pipe 14 in an air welding mode, and then the pouring pipe 7 is welded. Similarly, connecting holes of phi 100 are cut in the center positions of the pipe tops of the adjacent pouring pipes 7, the steel pipes 14 and the plugs at the two ends in an air welding mode so as to be used for arranging grouting pipes 8; the upper end of the grouting pipe 8 is welded with a blind plate 81 for sealing the grouting pipe, four phi 12 grouting holes 82 are circumferentially distributed at the position 3mm away from the top of the grouting pipe 8, after the grouting pipe 8 is arranged on the steel pipe 14, the upper end of the grouting pipe 8 is pressed against the inner wall of the tunnel body 1, and a part of the lower end of the grouting pipe is reserved in the steel pipe 14, and the length of the part is the same as that of the pouring pipe 7. The grouting pipe 8 is used for grouting, and also has the functions of observing concrete pouring conditions, exhausting air and resisting floating. The grouting pipe 8 and the hole top positioning ribs 13 are arranged at intervals so as to avoid position interference.
As shown in fig. 6, both ends of the steel pipe 14 are plugged by adopting a brick die structure 9, and an exhaust pipe 91 with phi 50 is pre-buried at the top of the brick die. The concrete placement adopts a vehicle-mounted pump to perform placement, a vehicle-mounted pump pipe is connected with the placement pipe 7 through a high-pressure hose, and correspondingly, a flashboard 71 for controlling placement is further arranged on the placement pipe 7.
And (3) sequentially withdrawing the concrete backfilling from the starting point to the end point, closing the pouring pipe 7 by using the flashboard 71 after each section of concrete pouring is completed, and then moving to the next position. And the concrete backfilling completion standard is that the concrete leaks out from the top of the embedded grouting pipe 8. And after the concrete backfilling is finished, grouting is carried out by adopting a grouting pipe 8, so that the concrete filling is ensured to be compact. After grouting, cutting the pouring pipe 7 and the grouting pipe 8, chamfering the original steel pipe 14, welding and sealing by using welding rods, and performing nondestructive flaw detection after sealing is finished, so that the welding quality is qualified.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (3)
1. The utility model provides a narrow space inside lining steel pipe mounting structure of water delivery tunnel, includes tunnel shaft (1), its characterized in that: the device is characterized in that a propulsion system is arranged in the tunnel body (1), propulsion equipment (5) is arranged at a hole inlet of the tunnel body (1), the propulsion system comprises an in-tunnel rolling device (2) and an in-tunnel guide rail device (3), the in-tunnel rolling device (2) and the in-tunnel guide rail device (3) are arranged at intervals in the tunnel body (1), and the in-tunnel rolling device (2) comprises a pair of earrings (21) symmetrically arranged at the bottom of the tunnel body (1), a steel shaft (22) arranged between the earrings (21) and a sleeve (23) rotationally arranged on the steel shaft (22);
the bottom of the tunnel body (1) is poured with a pipe penetrating platform (11) by adopting concrete, and the rolling device (2) in the tunnel and the guide rail device (3) in the tunnel are integrally poured in the pipe penetrating platform (11);
a supporting piece (12) is integrally cast in the pipe penetrating platform (11), and earrings (21) of the in-hole rolling device (2) are symmetrically welded on two sides of the supporting piece (12); a lacing wire (32) is arranged between two groups of guide rails (31) of the guide rail device (3) in the hole, and the lacing wire (32) is erected on the supporting piece (12);
the guide rail device (3) in the hole consists of two guide rails (31), and the guide rails (31) are formed by butt welding two channel steels;
the length of the guide rail device (3) in the tunnel is 30cm, a group of rolling devices (2) in the tunnel are arranged in the tunnel body (1) every 1m, and a group of guide rail devices (3) in the tunnel are arranged every 3 m;
positioning ribs (13) are arranged at the top and waist of the tunnel inside the tunnel body (1);
the tunnel body (1) is provided with a pipeline installation system at the entrance, the pipeline installation system comprises a pipeline placing platform (4) and a back (6) which are sequentially arranged from the entrance outwards, and the propulsion equipment (5) is positioned between the pipeline placing platform (4) and the back (6);
and a welding working pit (43) is arranged on one side of the pipeline placement platform (4) facing the tunnel body (1) inlet.
2. The construction method of the water delivery tunnel narrow space lining steel pipe installation structure according to claim 1, which is characterized in that: the method comprises the following steps:
s1, a propulsion system is used for construction, a supporting piece (12) is arranged at the bottom of a tunnel body (1), the supporting piece (12) is selected as channel steel or square pipes, a group of lugs (21) are welded on two sides of the supporting piece (12) at intervals of 1m, a group of guide rails (31) are placed at intervals of 3m, then concrete is poured into the tunnel body (1), the supporting piece (12) is poured into the concrete, the upper surface of the supporting piece (12) is flush with the concrete surface, a pipe penetrating platform (11) is formed after the concrete is formed, then a sleeve (23) is sleeved on a steel shaft (22), and the steel shaft (22) is placed in the lugs (21);
s2, installing positioning ribs (13) with phi 20 at the top and the waist of the tunnel body (1), wherein the positioning ribs (13) are fixed in the tunnel body (1) in a rib planting mode, the spacing between the positioning ribs (13) at the waist of the tunnel is 400cm, and the spacing between the positioning ribs (13) at the top of the tunnel is 500cm;
s3, constructing a steel pipe (14) installation system, pouring a pipeline placement platform (4) at the position of an inlet of a tunnel body (1), burying a back (6) at one end of the pipeline placement platform (4) far away from the inlet, abutting a propelling device (5) on the back (6), and selecting two 320T hydraulic jack picks as the propelling device (5);
s4, a welding working pit (43) is formed by bricking one end of the pipeline placing platform (4) facing the entrance;
s5, lifting the steel pipes (14) to the pipeline placing platform (4) by adopting an 80T crane, placing a mouth protecting iron (52) at the pipe orifice of the steel pipes (14), pushing the steel pipes (14) to move into the tunnel body (1) by the pushing iron (51), stopping working of the pushing equipment (5) when the pipe orifice of the current steel pipe (14) is positioned in the middle of the welding working pit (43), removing the pushing iron (51), lifting the next steel pipe (14) to the pipeline placing platform (4), abutting the front steel pipe (14) and the rear steel pipe (14), performing welding, polishing the welded junction at the bottom of the steel pipe (14) after the welding is finished, enabling the welded junction to be flush and smooth with the bottom of the steel pipe (14), and then performing pushing work again until the steel pipes (14) are all in place;
s6, backfilling concrete between the tunnel body (1) and the steel pipe (14).
3. The construction method of the water conveyance tunnel narrow space lining steel pipe installation structure according to claim 2, characterized by comprising the following steps: in S1, before pouring, a total station is adopted to determine the position of the pipe penetrating platform (11), the height of the pipe penetrating platform (11) is measured by a precise level gauge, and the height of the platform is controlled to be 1cm lower than the design bottom surface of the sleeve (23) after the steel shaft (22) is placed.
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