CN115110958A - Multi-arch tunnel group safe tunneling construction process under complex geological conditions - Google Patents
Multi-arch tunnel group safe tunneling construction process under complex geological conditions Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000008569 process Effects 0.000 title claims abstract description 38
- 230000005641 tunneling Effects 0.000 title claims abstract description 29
- 238000009412 basement excavation Methods 0.000 claims abstract description 22
- 238000005192 partition Methods 0.000 claims abstract description 13
- 230000000149 penetrating effect Effects 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims description 21
- 239000002689 soil Substances 0.000 claims description 12
- 238000009415 formwork Methods 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 7
- 230000008093 supporting effect Effects 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 description 8
- 239000004567 concrete Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 230000003203 everyday effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- 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
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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Abstract
The invention discloses a safe tunneling construction process of an arch-connected tunnel group under a complex geological condition, which comprises the steps of S1-S4. And S1, constructing advance support along the tunneling direction of the tunnel by adopting the small advance guide pipe. S2, mechanically excavating a middle pilot tunnel by a step method, and simultaneously performing arch sheathing and long pipe shed construction of the front pilot tunnel, the rear pilot tunnel and the middle pilot tunnel in the middle pilot tunnel excavating process. And (5) performing temporary support after excavation is finished. And S3, constructing a first mold mid-partition in the middle pilot tunnel along the tunneling direction. And S4, after the strength of the first mould intermediate wall meets the requirement, constructing a second mould intermediate wall along the tunneling direction, backfilling two sides of the first mould intermediate wall, and excavating a first cut pilot hole and a first cut pilot hole corresponding to the first mould intermediate wall by a step method after backfilling. And S5, penetrating the pilot tunnel and the rear pilot tunnel along the tunneling direction. The process accelerates the tunneling speed of the middle pilot tunnel, utilizes the existing mechanical equipment and personnel to the maximum extent, and avoids the situations of worker involvement and equipment limitation.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a safe tunneling construction process for multi-arch tunnel groups under complex geological conditions.
Background
The traditional construction method of the multi-arch tunnel is that the middle pilot tunnel is firstly penetrated, the intermediate wall is constructed backwards from the penetrating end, after the concrete strength of the intermediate wall meets the requirement, the temporary cross braces and the intermediate wall are backfilled to the penetrating end for construction, and then one side of the main tunnel is tunneled, so that in order to ensure the engineering safety, the excavation working faces of the main tunnels at two sides need to be staggered by a certain distance. But the construction period is delayed because the whole penetration duration of the intermediate wall is long; in addition, the tunnel is subjected to tunnel entering auxiliary construction, long pipe sheds are conventionally adopted, more pipe sheds are arranged in the whole tunnel (including a middle pilot tunnel) of the multi-arch tunnel, the middle pilot tunnel needs to be subjected to tunnel entering after the construction of the arch sheathing and the pipe sheds is finished, the construction time of the arch sheathing and the pipe sheds is long, and the total construction period of the tunnel is limited.
Disclosure of Invention
The invention aims to provide a safe tunneling construction process for a multi-arch tunnel group under a complex geological condition.
The technical problem solved by the invention is as follows: because the whole penetration duration of the intermediate wall is long, and the tunnel enters the tunnel for auxiliary construction, a long pipe shed is conventionally adopted, the construction time of the cover arch and the pipe shed is long, and the total construction period of the tunnel is limited.
The purpose of the invention can be realized by the following technical scheme:
a safe tunneling construction process for multi-arch tunnel groups under complex geological conditions comprises the following steps:
and S1, constructing advance support along the tunneling direction of the tunnel by adopting the small advance guide pipe.
S2, mechanically excavating a middle pilot tunnel by a step method, and simultaneously performing arch sheathing and long pipe shed construction of the front pilot tunnel, the rear pilot tunnel and the middle pilot tunnel in the middle pilot tunnel excavating process. And (5) performing temporary support after excavation is finished.
And S3, constructing a first mold mid-partition in the middle pilot tunnel along the tunneling direction.
And S4, after the strength of the first mould intermediate wall meets the requirement, constructing a second mould intermediate wall along the tunneling direction, backfilling two sides of the first mould intermediate wall, and excavating a first cut pilot hole and a first cut pilot hole corresponding to the first mould intermediate wall by a step method after backfilling.
And S5, constructing all mould mid-walls along the driving direction according to the method of S4 and penetrating the pilot tunnel and the rear pilot tunnel. And constructing supports on the pilot tunnel and the rear pilot tunnel and closing the supports into a ring.
As a further scheme of the invention: the leading small catheter has dimensions of phi 42 x 4 mm.
As a further scheme of the invention: the middle pilot tunnel excavation process comprises the following steps: firstly, excavating a pilot tunnel on the middle pilot tunnel, and constructing a temporary support on the middle pilot tunnel. And excavating a pilot tunnel below the middle pilot tunnel, and constructing temporary support below the middle pilot tunnel.
As a further scheme of the invention: in the process of excavating the middle pilot tunnel, a mine car track is arranged at the side wall of the middle pilot tunnel, and an out-of-tunnel traction device is arranged at one end of the mine car track, which is positioned outside the middle pilot tunnel. And the traction equipment outside the hole is used for driving the slag removal mine car to move along the mine car track.
As a further scheme of the invention: widening sections are arranged in the middle pilot tunnel at intervals. In the widening section, the loader and the dumper can work in parallel.
As a further scheme of the invention: when the middle pilot tunnel is excavated, the excavation section of the middle pilot tunnel is enlarged on the basis of the preset size, so that the loader and the dumper can work in parallel in the middle pilot tunnel.
As a further scheme of the invention: in the process of constructing the intermediate wall, hydraulic support legs are additionally arranged at the top of the intermediate wall formwork trolley. The upper end of the hydraulic support leg is supported on the primary support surface of the middle pilot tunnel. And (3) installing a wood formwork at the position which is 20cm away from the arch crown of the middle pilot tunnel at the top of the middle partition wall formwork trolley, and reserving a grouting pipeline between the arch crown of the middle pilot tunnel and the wood formwork.
The invention has the beneficial effects that:
the construction process of the invention adopts the improvement of the mode of advancing the pilot tunnel by the small guide pipe and discharging slag from the pilot tunnel, compared with the traditional construction process, the tunneling speed of the pilot tunnel is accelerated, the existing mechanical equipment and personnel are utilized to the maximum extent, and the condition of personnel working and equipment limitation is avoided; the forward construction of the intermediate wall is more reasonable in time and space arrangement, the utilization rate of personnel and equipment is greatly improved, and the construction period is saved; the mid-wall trolley is optimized, so that the mould running condition caused by the fact that the mid-wall trolley floats upwards due to light dead weight is avoided, and the compactness of the vault can be ensured by reserving the grouting pipe at the vault.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural diagram of a multi-arch tunnel;
FIG. 2 is a flow chart of the safe tunneling construction process of the multi-arch tunnel group under the complex geological condition;
FIG. 3 is a schematic illustration of a slag tapping method for a mine car according to the present invention;
FIG. 4 is a schematic view of a widening section of the present invention;
FIG. 5 is a schematic view of enlarging the excavation section of the middle pilot tunnel according to the invention;
fig. 6 is a schematic view of the structure of the intermediate wall dolly of the present invention.
In the figure: 11. a pilot hole is arranged on the middle pilot hole; 12. a pilot hole is arranged below the middle pilot hole; 13. temporary support is carried out on the middle pilot tunnel; 14. temporary support is carried out under the middle pilot tunnel; 21. guiding a pit on the pilot tunnel; 22. firstly, temporary supporting and outer primary lining are carried out; 23. firstly, guiding a pit below a tunnel; 24. firstly, temporary support and outer side and arch bottom primary lining are carried out; 25. guiding the hole to step up; 26. firstly, arch part primary support; 27. firstly, filling core soil on the tunnel; 28. firstly, guiding core soil below the tunnel; 29. firstly, supporting an inverted arch in the initial stage; 210. firstly, secondarily lining lower reinforced concrete; 211. firstly, lining reinforced concrete secondarily; 31. a pilot hole is arranged on the rear pilot hole; 32. rear temporary support and outer primary lining; 33. a pilot hole is arranged below the rear pilot hole; 34. a rear temporary support and an outer side and arch bottom primary lining; 35. the rear pilot tunnel is stepped; 36. primary support of a rear arch part; 37. core soil is arranged on the rear pilot tunnel; 38. core soil below the rear pilot tunnel; 39. primary support of a rear inverted arch; 310. lining the secondary lining with reinforced concrete; 311. secondly, lining the reinforced concrete on the secondary lining; 4. and (5) temporary shoring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a safe tunneling construction process of an arch-connected tunnel group under complex geological conditions, which is used for shortening the whole construction period, and the arch-connected tunnel structure is shown in figure 1. Please refer to fig. 2, which specifically includes the following steps S1-S4.
And S1, constructing advanced support along the tunneling direction of the tunnel by adopting the advanced small catheter. Specifically, in the embodiment of the invention, a phi 42 multiplied by 4mm advanced small guide pipe is adopted to assist in construction and cave entering, so that the construction period of the middle guide hole for cave entering is saved.
S2, mechanically excavating a middle pilot tunnel by a step method, and simultaneously performing arch sheathing and long pipe shed construction of the front pilot tunnel, the rear pilot tunnel and the middle pilot tunnel in the middle pilot tunnel excavating process. And (5) performing temporary support after excavation is finished.
In the embodiment of the invention, in the middle pilot tunnel excavation process, the construction of the left main tunnel, the right main tunnel, the middle pilot tunnel arch cover and the long pipe shed is simultaneously carried out, and the subsequent main tunnel construction preparation work is well carried out. The traditional construction method is sequential operation in the steps at present, and the process of the invention is parallel construction, so the construction period is shortened. In one embodiment of the invention, a leading small guide pipe is adopted to lead a middle guide hole to enter the hole in advance, and the construction time is 3 days. If the traditional construction method is adopted for conventional hole entering, the common hole cover arch and long pipe shed construction needs 20d, the bias hole needs 30d, and the construction period can be saved by 17d and 27 d.
In the embodiment of the invention, the middle pilot tunnel excavation process comprises the following steps: firstly, excavating a pilot tunnel upper pilot tunnel 11 and constructing a temporary support 13 on the pilot tunnel. And excavating a pilot tunnel lower pilot tunnel 12 and constructing a temporary support 14 under the pilot tunnel.
In one embodiment of the invention, referring to fig. 3, after the excavation of the pilot tunnel lower pilot tunnel 12 is completed, the mine car track is arranged at the side wall of the pilot tunnel, and the end of the mine car track outside the pilot tunnel is provided with an out-of-tunnel traction device. And the traction equipment outside the hole is used for driving the slag removal mine car to move along the mine car track. The conventional reverse slag tapping mode of the loader is changed into a rail slag tapping mode, namely, an external traction mine car method is adopted for tunnel slag tapping. The mine car adopts 3-5 m 3 The left and right simple mine cars can be processed and remanufactured according to the actual conditions of the tunnel and are provided with the steerable loader. And the mine car transports the tunnel slag to the tunnel portal through the traction equipment, pours the tunnel slag into a temporary slag disposal field, and transports the tunnel slag to a specified slag disposal field by the dump truck. Influenced by the size of the section of the middle pilot tunnel, the track of the mine car is arranged along the side wall of the tunnel, and a space is reserved for charging slag of the small-sized loader. The slag can be discharged after the excavation of well pilot tunnel every circulation is accomplished, and the excavator is discharged the slag to face cooperation mine car, adopts the rail transportation can accelerate the speed of discharging slag, and the mine car leans on entrance to a cave traction equipment to provide power, and the speed of traveling can improve by a wide margin than the loader.
In one embodiment of the invention, the widened sections are arranged at intervals in the middle pilot hole. In the widening section, the loader and the dumper can work in parallel. Referring to fig. 4, the bottom of the original pilot tunnel has a width of 5.46m and a height of 4m, and in the widening section, the bottom is widened from 5.46m to about 7.62m, and the height of 4m is widened to about 6.56m, so that the parallel connection of the loader and the dumper can be met. The length of each widening section is 12m (the length of the gradual change section is 5m + the length of the widened straight line section is 7m + the straight wall type end), and the interval of the widening sections is about 80 m. The loader and the dumper can be constructed in parallel every 80m or so, the slag discharging efficiency is accelerated, and the construction period is shortened.
In one embodiment of the invention, when the middle pilot tunnel is excavated, the excavation section of the middle pilot tunnel is enlarged on the basis of the preset size, so that the loader and the dumper can work in parallel in the middle pilot tunnel. As shown in figure 5, arches on two sides of the middle pilot tunnel vertically fall to the ground from the outermost edge of the arch waist, the bottom of the middle pilot tunnel is widened from 5.46m to 7.5m, and the position with the height of 4m is widened to about 6.97m, so that the parallel operation of a loader and a dumper can be met. After this scheme of adoption, loader and tipper can be under construction for the efficiency of slagging tap, practice thrift construction period.
The invention compares the results of the above three examples, and the results are shown in Table 1.
TABLE 1
The conventional loader is adopted to back up to remove slag, the support can be excavated and supported for 1 cycle every day on average, the three improved slag removal modes are adopted, 2 cycles can be carried out every day on average, and the construction efficiency is improved.
And S3, constructing a first mold mid-partition in the middle pilot tunnel along the tunneling direction.
According to mid-board design characteristics, when concrete placement construction, because platform truck weight is lighter, the easy come-up, and mid-board top is the arc, pours and easily produces vault cavity quality defect. In the embodiment of the invention, in the process of constructing the intermediate wall, the intermediate wall template trolley is optimized, and the hydraulic support legs are additionally arranged at the top. As shown in figure 6, the upper end of the hydraulic support leg is supported on the primary support surface of the middle pilot tunnel. And (3) installing a wood formwork at the position which is 20cm away from the arch crown of the middle pilot tunnel at the top of the middle partition wall formwork trolley, and reserving a grouting pipeline between the arch crown of the middle pilot tunnel and the wood formwork. Smooth form removal can be guaranteed, and grouting pipelines can be reserved between the wood forms at the arch crown of the intermediate wall, so that grouting effect is guaranteed. The longitudinal distance between the reserved grouting pipes is 3-4m, the two sides of the grouting pipes are arranged in a crossed mode, and expansion mortar is adopted to ensure the grouting compactness of the vault and achieve the supporting effect of the intermediate wall.
And S4, after the strength of the first mould intermediate wall meets the requirement, constructing a second mould intermediate wall along the tunneling direction, backfilling two sides of the first mould intermediate wall, and excavating a first cut pilot hole and a first cut pilot hole corresponding to the first mould intermediate wall by a step method after backfilling.
The embodiment of the invention adopts a method for constructing the intermediate wall in a forward direction. Namely: the middle pilot tunnel, the middle partition wall, the temporary cross braces 4 and the backfill of the middle partition wall, the side pilot tunnel of the main tunnel and the main tunnel are all constructed from one end to the other end. And (5) after the partition wall concrete in the first mould reaches 28d strength, backfilling and compacting to construct the main hole. The construction period of the intermediate wall is saved, the intermediate wall and the main hole are constructed in parallel, the space and the time tend to be more reasonable, the maximum utilization rate of personnel and machinery can be achieved, and the construction period is saved. Such as: the tunnel length 272m of the large green No. 1 tunnel, one mold of the intermediate wall 9m, and 30 molds in total. Each mold of the intermediate wall took 3 days. The main hole side pilot tunnel is constructed 90 days later in the conventional construction, and the main hole side pilot tunnel can be constructed about 30 days later in the forward construction method; compared with the conventional construction method, the forward parallel construction period is saved by 60 days.
It should be noted that before backfilling on two sides of the middle partition plate, a temporary cross brace 4 is arranged on one side close to the rear pilot tunnel, and the backfilling height of one side of the rear pilot tunnel is flush with the uppermost temporary cross brace 4 during backfilling. The backfill height of one side of the pilot hole is 3.5 m.
And S5, constructing all mould mid-walls along the driving direction according to the method of S4 and penetrating the pilot tunnel and the rear pilot tunnel. And constructing supports on the pilot tunnel and the rear pilot tunnel and closing the supports into a ring.
The construction process of the pilot tunnel and the rear pilot tunnel comprises the following steps:
firstly, a pilot tunnel upper pilot pit 21 is excavated, and first temporary support and outer primary lining 22 are applied. And excavating a pilot tunnel lower pilot pit 23, and constructing a first temporary support and an outer side and arch bottom primary lining 24.
And excavating a pilot tunnel upper pilot pit 31 after pilot tunnel excavation, performing temporary support after construction and primarily lining the outer side 32 by staggering a preset distance along the tunneling direction. And excavating a lower pilot tunnel 33 of the rear pilot tunnel, and constructing a temporary support and an outer side and arch bottom primary lining 34 after construction.
The upper step 25 of the pilot tunnel is excavated first, and the preliminary support 26 of the pilot arch is constructed. And excavating core soil 27 on the pilot tunnel and core soil 28 under the pilot tunnel, and constructing a primary inverted arch support 29. Finally, secondary lining is carried out on the pilot tunnel, and the concrete comprises firstly reinforced concrete 210 below the secondary lining and firstly reinforced concrete 211 above the secondary lining
The upper step 35 of the pilot tunnel is excavated first, and the preliminary support 36 of the rear arch part is constructed. And excavating upper core soil 37 and lower core soil 38 of the rear pilot tunnel, and constructing a rear inverted arch primary support 39. And finally, secondary lining of the rear pilot tunnel, specifically comprising rear secondary lining lower reinforced concrete 310 and rear secondary lining upper reinforced concrete 311.
The invention adopts the improvement of the mode of advancing the pilot tunnel and discharging slag from the centering pilot tunnel by the advanced small guide pipe, compared with the traditional construction process, the invention accelerates the tunneling speed of the middle pilot tunnel, utilizes the existing mechanical equipment and personnel to the maximum extent and avoids the condition of personnel working and equipment limitation; the forward construction of the intermediate wall is more reasonable in time and space arrangement, the utilization rate of personnel and equipment is greatly improved, and the construction period is saved; the mid-wall trolley is optimized, so that the mould running condition caused by the fact that the mid-wall trolley floats upwards due to light dead weight is avoided, and the compactness of the vault can be ensured by reserving the grouting pipe at the vault.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A safe tunneling construction process for multi-arch tunnel groups under complex geological conditions is characterized by comprising the following steps:
s1, constructing an advance support along the tunneling direction of the tunnel by adopting an advance small conduit;
s2, mechanically excavating a middle pilot tunnel by a step method, and simultaneously performing arch sheathing and long pipe shed construction of the front pilot tunnel, the rear pilot tunnel and the middle pilot tunnel in the middle pilot tunnel excavation process; performing temporary support after excavation is finished;
s3, constructing a first mould mid-partition in the middle pilot tunnel along the tunneling direction;
s4, after the strength of the first mould intermediate wall meets the requirement, constructing a second mould intermediate wall along the tunneling direction, backfilling two sides of the first mould intermediate wall, and excavating a first cut pilot hole and a first cut pilot hole corresponding to the first mould intermediate wall by a step method after backfilling;
s5, constructing all mould mid-partitions along the driving direction according to the method of S4 and penetrating the pilot tunnel and the rear pilot tunnel; and constructing supports on the pilot tunnel and the rear pilot tunnel and closing the supports into a ring.
2. The process of safe multi-arch tunnel group tunneling construction under complex geological conditions as claimed in claim 1, wherein the size of the small advanced conduit is phi 42 x 4 mm.
3. The process of safe excavation construction of the multi-arch tunnel group under the complex geological condition according to claim 1, wherein the middle pilot tunnel excavation process comprises the following steps: firstly, excavating a pilot tunnel upper pilot tunnel (11), and constructing a temporary support (13) on the pilot tunnel; and excavating a pilot tunnel lower pilot tunnel (12) and constructing a temporary support (14) under the pilot tunnel.
4. The process of claim 1, wherein in the process of excavating the middle pilot tunnel, a mine car track is arranged on the side wall of the middle pilot tunnel, and an out-of-tunnel traction device is arranged at one end of the mine car track outside the middle pilot tunnel; and the traction equipment outside the hole is used for driving the slag removal mine car to move along the mine car track.
5. The process of safe excavation construction of the multi-arch tunnel group under the complex geological condition according to claim 1, wherein widening sections are arranged at intervals in the middle pilot tunnel; in the widening section, the loader and the dumper can work in parallel.
6. The process of claim 1, wherein during excavation of the pilot tunnel, the excavation section of the pilot tunnel is enlarged on the basis of the preset size, so that a loader and a dumper can work in parallel in the pilot tunnel.
7. The process of claim 1, wherein in the process of constructing the intermediate wall, hydraulic support legs are additionally arranged at the top of the intermediate wall template trolley; the upper end of the hydraulic support leg is supported on the primary support surface of the middle pilot tunnel; and (3) installing a wood formwork at the position which is 20cm away from the arch crown of the middle pilot tunnel at the top of the middle partition wall formwork trolley, and reserving a grouting pipeline between the arch crown of the middle pilot tunnel and the wood formwork.
8. The process of claim 1, wherein the grouting pipes are arranged at a longitudinal distance of 3-4m and are crossed at two sides, and expansion mortar is adopted.
9. The process for the safe tunneling construction of the multi-arch tunnel group under the complex geological condition as claimed in claim 1, wherein when backfilling is carried out on two sides of the middle partition plate, the backfilling height of one side of the rear pilot tunnel is flush with the uppermost temporary cross brace (4); the backfill height of one side of the pilot hole is 3.5 m.
10. The process of safe excavation construction of the multi-arch tunnel group under the complex geological condition according to claim 1, wherein the construction process of the pilot tunnel and the back pilot tunnel comprises the following steps:
firstly, excavating a pilot tunnel upper pilot pit (21), and constructing a first temporary support and an outer primary lining (22); excavating a pilot tunnel lower pilot pit (23), and constructing a first temporary support and an outer side and arch bottom primary lining (24);
excavating a pilot tunnel upper pilot pit (31) after pilot tunnel excavation by staggering a preset distance along the tunneling direction, and temporarily supporting and primarily lining the outer side (32) after construction; excavating a lower pilot tunnel (33) of the rear pilot tunnel, and performing temporary support and outer side and arch bottom primary lining (34) after construction;
firstly, excavating an upper step (25) of a pilot tunnel and constructing a primary support (26) of a first arch part; excavating core soil (27) above the pilot tunnel and core soil (28) below the pilot tunnel, and constructing a primary inverted arch support (29); finally, secondary lining is carried out on the pilot tunnel;
firstly, excavating an upper step (35) of a pilot tunnel, and constructing a preliminary support (36) of a rear arch part; excavating upper core soil (37) of the rear pilot tunnel and lower core soil (38) of the rear pilot tunnel, and constructing a rear inverted arch primary support (39); and finally, secondary lining of the rear pilot tunnel.
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| CN103244127A (en) * | 2013-04-22 | 2013-08-14 | 中交路桥北方工程有限公司 | Method for quickening construction of multiple-arch tunnel |
| CN105909306A (en) * | 2016-06-22 | 2016-08-31 | 四川路桥华东建设有限责任公司 | Super-long large dip angle tunnel anchorage double-track slag removal construction method |
| CN110219654A (en) * | 2019-07-12 | 2019-09-10 | 中铁隧道集团一处有限公司 | The leading construction method of mud stone multiple-arch tunnel side pilot tunnel |
| CN111075454A (en) * | 2020-01-17 | 2020-04-28 | 中铁十九局集团第三工程有限公司 | Double-arch tunnel five-hole excavation method |
| CN114352292A (en) * | 2021-12-31 | 2022-04-15 | 中交路桥建设有限公司 | Shallow-buried bias-pressure multi-arch tunnel construction method for weathering phyllite stratum |
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Application publication date: 20220927 |