CN107201908B - Construction method for deep-buried central ditch of tunnel in severe cold region - Google Patents
Construction method for deep-buried central ditch of tunnel in severe cold region Download PDFInfo
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- CN107201908B CN107201908B CN201710318044.2A CN201710318044A CN107201908B CN 107201908 B CN107201908 B CN 107201908B CN 201710318044 A CN201710318044 A CN 201710318044A CN 107201908 B CN107201908 B CN 107201908B
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- 238000010276 construction Methods 0.000 title claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000009412 basement excavation Methods 0.000 claims abstract description 22
- 238000005422 blasting Methods 0.000 claims abstract description 20
- 238000004321 preservation Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 239000004575 stone Substances 0.000 claims description 8
- 239000011083 cement mortar Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 238000009432 framing Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000009825 accumulation Methods 0.000 claims description 3
- 239000002360 explosive Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008520 organization Effects 0.000 abstract description 2
- 239000011435 rock Substances 0.000 abstract description 2
- 238000009417 prefabrication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 208000001034 Frostbite Diseases 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 210000001364 upper extremity Anatomy 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
-
- 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
Abstract
The invention discloses a construction method of a deep buried central ditch of a tunnel in a severe cold region, which adopts a simple inverted arch trestle to carry out advanced construction on the deep buried central ditch before tunnel inverted arch construction, and then adopts a self-propelled inverted arch trestle to carry out construction on the inverted arch, and the specific construction steps are as follows: step one, adopting blank hole control blasting construction, vertical hole distribution deep hole blasting, layered blasting excavation and water ditch blastholes tilting outwards; step two, excavating the position of the ditch to a designed elevation by adopting a small excavator; step three, cleaning clear water ditch virtual slag and ponding; fourthly, constructing a base; burying and installing culvert pipes; step six, grading backfilling; step seven, pouring heat-preservation concrete; the method effectively solves the problems of difficult construction organization, low work efficiency, slow construction progress, high cost, large disturbance to surrounding rock and the like in the prior art, and achieves a good use effect.
Description
Technical Field
The invention relates to a construction method of a tunnel deep-buried central ditch in a severe cold region, in particular to a construction method of a tunnel deep-buried central ditch in a severe cold region in northeast.
Background
The tunnel in the severe cold region, the biggest depth of freezing of soil is about 2.0m, mainly considers the heat preservation requirement that prevents frostbite, has carried out the deep design to the central ditch, and construction team is for reducing the construction process in traditional construction, shortens cycle time, often excavates to the deep central ditch end from the inverted arch filling face once, because of once excavation degree of depth is too high, leads to the inverted arch to dig seriously excessively, and needs in time backfill just can carry out the face operation after the deep central ditch of burying of construction, great to tunnel construction progress influence, and transportation vehicle driving safety has certain risk. At present, a set of safe and simple construction method is not available for the construction of the deep-buried central ditch of the tunnel in the severe cold region.
Disclosure of Invention
The invention aims to solve the technical problems that: the construction method for the deep-buried central ditch in the severe cold region adopts the simple inverted arch trestle and the self-propelled inverted arch trestle to carry out parallel propelling construction, and effectively solves the problems of difficult construction organization, low work efficiency, slow construction progress, high cost, large disturbance to surrounding rocks and the like in the prior art.
The technical scheme of the invention is as follows: before tunnel inverted arch construction, a simple inverted arch trestle is adopted to carry out advanced construction on the deep buried central ditch, and then a self-propelled inverted arch trestle is adopted to carry out construction on the inverted arch, wherein the construction steps are as follows: step one, adopting blank hole control blasting construction, vertical hole distribution deep hole blasting, layered blasting excavation and water ditch blastholes tilting outwards; step two, excavating the position of the ditch to a designed elevation by adopting a small excavator; step three, cleaning clear water ditch virtual slag and ponding; fourthly, constructing a base; step five, burying and installing culvert pipes (prefabrication); step six, grading backfilling; step seven, pouring heat-preservation concrete; step eight, paving an insulation board; and step nine, adopting a simple inverted arch trestle and a self-propelled inverted arch trestle to carry out parallel propelling construction.
In the deep-buried central ditch construction, a self-propelled concrete pouring trestle and a deep-buried central ditch excavation trestle are adopted to separate the inverted arch and the deep-buried central ditch, the self-propelled concrete pouring trestle carries out framing flow operation on the inverted arch (24 m in total), and the deep-buried central ditch excavation trestle carries out advanced construction on the deep-buried central ditch.
In the first step, the specific explosive consumption is 0.6kg/m 3 Controlling the blasting area to be 4.4m 2 The excavation dosage is 11.56kg per 4m of cycle, the single-hole charge on two sides is 0.15kg, and the single-hole charge on two rows of holes in the middle is 1.2kg.
And step two, excavating and deslagging, namely excavating a ditch position to a designed elevation by adopting a small excavator, wherein the top surface position of the inner rail is.
Thirdly, water accumulation and slag deficiency of the clear water ditch are managed: and the high-power water pump is adopted to rapidly pump the accumulated water of the excavated groove, and the virtual slag is cleaned manually.
And step four, constructing a base: the tube seat is formed by casting C20 concrete.
Step five, burying and installing culvert pipes (prefabrication): after the tube seat is installed, M20 cement mortar is needed to fill the peripheral gaps, so that the tube seat is prevented from moving; the culvert pipe is wrapped by geotechnical cloth, the culvert pipe is adjusted to the central ditch by using lifting equipment, the staggered position of the tunnel structure is ensured to ensure the water pipes to be connected in sequence, the drainage pipes are connected by adopting a tongue-and-groove rigid joint mode, and the joint adopts a steel wire mesh cement mortar plastering joint.
Step six, grading backfilling: before the graded broken stone is constructed, the transverse water guide pipe is introduced into the central ditch, and the graded broken stone is backfilled and compacted.
Seventh, pouring heat-preservation concrete: and C20 heat-insulating concrete is poured at the top.
Step eight, paving an insulation board: and a polyurethane heat-insulating plate with the thickness of 5cm is applied between the top of the concrete and the primary support of the inverted arch, and the width of the heat-insulating plate is more than or equal to 2m.
Step nine, adopting simple inverted arch trestle and self-propelled inverted arch trestle to carry out parallel propelling construction: advanced construction is carried out on the deep buried central ditch by adopting a simple inverted arch trestle, and then construction is carried out on the inverted arch by adopting a self-propelled inverted arch trestle.
The method comprises the following steps: after the first ring deep buried central ditch construction is completed, a self-propelled concrete pouring trestle and a deep buried central ditch excavation trestle are adopted to separate the inverted arch and the deep buried central ditch into water for construction, the self-propelled concrete pouring trestle performs framing flow operation on the inverted arch (24 m in total), and the deep buried central ditch excavation trestle performs advanced construction on the deep buried central ditch (see figure 1).
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
1) The dust concentration is effectively reduced by controlling the application of the blasting technology, the occupational health of operators is guaranteed, the ventilation and smoke discharge frequency is effectively reduced, and the resource consumption is indirectly reduced;
2) The application of the technology effectively shortens the blasting throwing distance and reduces the occurrence probability of blasting injury;
3) The movable inverted arch trestle belongs to a highly integrated industrial finished product, and compared with the traditional trestle, the stability and safety protection measures of the movable inverted arch trestle are greatly improved, so that the construction efficiency is effectively improved, and the construction cost is reduced;
4) The combined construction mode of the self-propelled inverted arch trestle (the effective length is 24 meters, the whole length is 43 m) and the simple inverted arch trestle is adopted, so that the traditional line production modes of deep-buried central ditch excavation supporting, inverted arch supporting and inverted arch concrete pouring are changed, the construction period is effectively shortened, the progress is improved, and the construction quality is ensured;
5) The invention ensures construction safety, improves construction quality, accelerates construction progress, reduces construction cost and achieves good field actual use effect.
Drawing and description
FIG. 1 is a longitudinal section view of a construction process of the present invention;
FIG. 2 is a construction process diagram of the present invention;
FIG. 3 is a schematic illustration of an excavation blast hole of the present invention;
FIG. 4 is a schematic illustration of excavated slag removal of the present invention;
FIG. 5 is a schematic illustration of culvert pipe laying and overlap joint according to the present invention;
FIG. 6 is a schematic view of a culvert pipe reserved hole and a drain hole according to the present invention;
FIG. 7 is a schematic view of the deep buried central drain structure of the present invention.
The marks in the figure are as follows: 1. a step is arranged; 2. descending a step; 3. deep-buried central ditch excavation trestle; 4. a ditch construction area; 5. a lane crossing turning area; 6. inverted arch ballasting area; 7. a front axle; 8. a front leg trolley area; 9. self-propelled concrete pouring trestle; 10. a reinforcing steel bar binding area; 11. a concrete pouring area; 12. a forming area, 13, an inner rail top; 14. inverted arch excavation of the I part; 15. inverted arch excavation part II; 16. inverted arch excavation of III-1, III-2 parts, 17 and C20 concrete bases; 18. geotextile; 19. Steel wire mesh cement mortar; 20 a water discharge hole; 21. grading crushed stone, 22 and C20 heat preservation concrete; 23. polyurethane insulation board.
Detailed Description
The specific embodiment of the invention comprises the following steps: the utility model provides a cold region tunnel buries central ditch deeply adopts nine steps (see fig. 2) (nine steps) to carry out the construction, excavates the working face to the inverted arch top before the construction, then adopts plain type inverted arch landing stage and self-propelled inverted arch landing stage to buries central ditch deeply and inverted arch framing operation (see fig. 1), specifically includes the following steps:
step one, excavating and blasting: the hole controlled blasting construction (see figure 3) is adopted, the vertical hole-distribution deep hole blasting, the layered blasting excavation and the ditch hole blasting are all inclined outwards of the hole, and the specific explosive consumption is 0.6kg/m 3 Controlling the blasting area to be 4.4m 2 . The excavation dosage is 11.56kg for each cycle of 4 m. 0.15kg of single-hole charge on two sides and 1.2kg of single-hole charge on two rows of holes in the middle.
Step two, deslagging: first the site 14 is excavated, then the site 15 is excavated with a mini-excavator, and finally the sites 16-1, 16-2 (see fig. 4) are excavated. And (5) excavating a deep buried central ditch, wherein the excavation depth of the ditch is 435cm from the filling surface of the inverted arch. And after the ballast discharging is completed, retesting the excavation depth and width by adopting a total station, and if the underexcavation exists, timely processing.
Step three, water accumulation and virtual slag removal of a clear water ditch: the water in the excavated groove is pumped out quickly by adopting a high-power water pump; and cleaning the virtual slag manually.
And fourthly, constructing a concrete base: the pipe seat adopts C20 concrete pouring (17), can be prefabricated outside the hole in advance, and the peripheral gap is filled with M20 cement mortar after the pipe seat is installed, so that the pipe seat is prevented from moving.
Step five, burying and installing culvert pipes (prefabrication): the culvert pipe is wrapped by geotechnical cloth (18), the culvert pipe is adjusted to the central ditch by using hoisting equipment, the water pipe is ensured to be connected in sequence at the staggered position of the tunnel structure, and the gradient of the water pipe is not less than that of the tunnel longitudinal slope. When the longitudinal slope of the line is less than 3 per mill, the drainage slope of the deep buried central ditch is adjusted to 3 per mill. The drainage pipes are connected in a tongue-and-groove rigid joint mode, and the joint adopts a steel wire mesh cement mortar (19) plastering joint (see figure 5).
Step six, grading backfilling: before construction, the graded broken stone (21) is firstly introduced into a deep buried central ditch water discharge hole (20), the deep length is not less than 3cm, then the graded broken stone is backfilled to a position 25cm above the top of the pipe by adopting aggregate with good permeability, difficult efflorescence and good grading, the diameter is between 2.5 and 5.0cm, and the graded broken stone is backfilled tightly.
Step seven, pouring heat-preservation concrete: and pouring C20 heat-insulating concrete (22) at the top after grading macadam construction is completed and leveling is carried out.
Step eight, paving an insulation board: a polyurethane insulation board (23) with the thickness of 5cm and the breadth of 2m is applied between the top of the concrete and the initial support of the inverted arch.
Step nine, adopting a simple inverted arch trestle (3) +a self-propelled inverted arch trestle (9) for parallel propelling construction: advanced construction is carried out on the deep buried central ditch by adopting a simple inverted arch trestle, and then construction is carried out on the inverted arch by adopting a self-propelled inverted arch trestle.
The method comprises the following steps: after the first ring deep buried central ditch construction is completed, a self-propelled concrete pouring trestle and a deep buried central ditch excavation trestle are adopted to separate the inverted arch and the deep buried central ditch into water for construction, the self-propelled concrete pouring trestle performs framing flow operation on the inverted arch (24 m in total), and the deep buried central ditch excavation trestle performs advanced construction on the deep buried central ditch (see figure 1).
Claims (8)
1. A construction method for a deep-buried central ditch of a tunnel in a severe cold region is characterized by comprising the following steps: before tunnel inverted arch construction, advanced construction is carried out on a deep buried central ditch by adopting a simple inverted arch trestle, then construction is carried out on the inverted arch by adopting a self-propelled inverted arch trestle, and the specific construction steps are as follows: step one, adopting blank hole control blasting construction, vertical hole distribution deep hole blasting, layered blasting excavation and water ditch blastholes tilting outwards; step two, excavating the position of the ditch to a designed elevation by adopting a small excavator; step three, cleaning clear water ditch virtual slag and ponding; fourthly, constructing a base; burying and installing culvert pipes; step six, grading backfilling; step seven, pouring heat-preservation concrete; step eight, paving an insulation board; and step nine, adopting a simple inverted arch trestle and a self-propelled inverted arch trestle to carry out parallel propelling construction, adopting the simple inverted arch trestle to carry out advanced construction on the deep buried central ditch, and then adopting the self-propelled inverted arch trestle to carry out construction on the inverted arch.
2. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: in the construction method of the deep-buried central ditch, a self-propelled inverted arch trestle and a simple inverted arch trestle are adopted to separate the inverted arch and the deep-buried central ditch for flow construction, the self-propelled inverted arch trestle carries out framing flow production on the inverted arch, and the simple inverted arch trestle carries out advanced construction on the deep-buried central ditch.
3. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: in the first step, the specific explosive consumption is controlled according to 0.6kg/m < 3 >, the blasting area is 4.4m < 2 >, the excavation dosage is 11.56kg for every cycle of 4m, the single-hole charges on two sides are 0.15kg, and the single-hole charges in two rows in the middle are 1.2kg.
4. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: thirdly, water accumulation and slag deficiency of the clear water ditch are managed: and the high-power water pump is adopted to rapidly pump the accumulated water of the excavated groove, and the virtual slag is cleaned manually.
5. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: step five, burying and installing culvert pipes: after the tube seat is installed, M20 cement mortar is needed to fill the peripheral gaps, so that the tube seat is prevented from moving; the culvert pipe is wrapped by geotechnical cloth (18), the culvert pipe is adjusted to the central ditch by using hoisting equipment, the staggered position of the tunnel structure ensures that water pipes are connected in sequence, a tongue-and-groove rigid joint form is adopted between the drain pipes, and a steel wire mesh cement mortar (19) plastering joint is adopted.
6. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: step six, grading backfilling: before the graded broken stone construction, the transverse water guide pipe is introduced into the central ditch water discharge hole (20), and the graded broken stone (21) is backfilled and compacted.
7. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: seventh, pouring heat-preservation concrete: and C20 heat-insulating concrete (22) is poured at the top.
8. The construction method of the tunnel deep-buried central ditch in the severe cold region according to claim 1, wherein the construction method comprises the following steps: step eight, paving an insulation board: and a polyurethane heat-insulating plate (23) with the thickness of 5cm is applied between the top of the concrete and the initial support of the inverted arch, and the width of the heat-insulating plate is more than or equal to 2m.
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| CN201710318044.2A CN107201908B (en) | 2017-06-16 | 2017-06-16 | Construction method for deep-buried central ditch of tunnel in severe cold region |
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| CN201710318044.2A CN107201908B (en) | 2017-06-16 | 2017-06-16 | Construction method for deep-buried central ditch of tunnel in severe cold region |
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| CN107201908A CN107201908A (en) | 2017-09-26 |
| CN107201908B true CN107201908B (en) | 2023-10-31 |
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| CN109441489B (en) * | 2018-12-29 | 2024-04-05 | 中国铁路设计集团有限公司 | Tunnel deep-buried central ditch supporting structure and supporting construction method |
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