CN110714772A - Construction process of saturated loess 12m large-span small-clear-distance tunnel - Google Patents
Construction process of saturated loess 12m large-span small-clear-distance tunnel Download PDFInfo
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- CN110714772A CN110714772A CN201911203260.8A CN201911203260A CN110714772A CN 110714772 A CN110714772 A CN 110714772A CN 201911203260 A CN201911203260 A CN 201911203260A CN 110714772 A CN110714772 A CN 110714772A
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- 238000010276 construction Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 24
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 69
- 238000001556 precipitation Methods 0.000 claims abstract description 26
- 238000009412 basement excavation Methods 0.000 claims abstract description 17
- 239000004746 geotextile Substances 0.000 claims description 48
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 21
- 238000005507 spraying Methods 0.000 claims description 18
- 238000005086 pumping Methods 0.000 claims description 16
- 238000005553 drilling Methods 0.000 claims description 12
- 230000009193 crawling Effects 0.000 claims description 9
- 229920001971 elastomer Polymers 0.000 claims description 9
- 239000012943 hotmelt Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 238000007654 immersion Methods 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
- E21D11/381—Setting apparatus or devices
-
- 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
-
- 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
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a construction process of a saturated loess 12m large-span small-clear-distance tunnel, which comprises the following steps of: s1) precipitation before construction; s2) forepoling construction; s3) tunnel excavation and primary lining support are carried out; s4) waterproof layer and secondary lining support; wherein, precipitation before construction in S1) is realized by a precipitation well and a water collection pool; the water collecting tank is arranged far away from the tunnel excavation site and is communicated with the dewatering well; and the excavation site of the water collecting tank and the tunnel is not less than 2 km. The construction process of the large-span small-clear-distance tunnel with saturated loess of 12m disclosed by the invention adopts the water collecting tank and the precipitation well which are used simultaneously, so that the precipitation in the construction area before excavation is well controlled, and the influence of underground water seepage or water immersion on the tunnel construction is avoided.
Description
Technical Field
The invention relates to the technical field of construction processes of large-collapse small-clear-distance tunnels, in particular to a construction process of a large-span small-clear-distance tunnel saturated with loess 12 m.
Background
Due to the influences of factors such as the showing difficulty and the large occupied area caused by the limitation of terrain and geological conditions and the tunnel construction, the structural form of the small-clear-distance tunnel is increasingly selected in the urban tunnel engineering construction. Compared with a multi-arch tunnel, the small clear distance tunnel has the advantages of simple construction process and low construction cost; compared with the common separated tunnel, the method can increase the degree of freedom of route wiring, reduce the scale of the separated roadbed, reduce the excavation work amount of the tunnel portal and is beneficial to environmental protection. Therefore, the small clear distance tunnel has great practical significance for improving the traffic efficiency, protecting and utilizing the natural environment, accelerating the development of economic construction and the like.
Loess is a special soil which is rich in pores and developed in joints, and has its collapsible property due to changes in pore structure caused by water immersion, and research on the collapsible property of loess has been conducted for years internationally. Tunneling in loess poses many risks and challenges, including large deformation of the formation due to the collapsible property and erosion of the formation due to seepage of groundwater, which severely impact the safety of tunnel construction and surrounding environment.
Disclosure of Invention
Aiming at the prior art, the invention provides a construction process of a large-span small-clear-distance tunnel saturated with loess 12 m.
The invention is realized by the following technical scheme: the construction process of the saturated loess 12m large-span small-clear-distance tunnel comprises the following steps:
s1) precipitation before construction;
s2) forepoling construction;
s3) tunnel excavation and primary lining support are carried out;
s4) waterproof layer and secondary lining support;
wherein, precipitation before construction in S1) is realized by a precipitation well and a water collection pool; the water collecting tank is arranged far away from the tunnel excavation site and is communicated with the dewatering well; and the excavation site of the water collecting tank and the tunnel is not less than 2 km.
Further, the construction step of S1) is:
s11) positioning and clearly identifying the precipitation well and the water collecting pool according to the design scheme and the actual site;
s12) adopting impact drilling to form a hole, wherein the aperture meets the requirement of placing a submersible pump in a water pumping pipe; then adopting slurry to protect the wall;
s13) cleaning the hole immediately after the hole is formed, and mounting a well pipe, wherein a filter pipe part of the well pipe is placed at the position of the permeable layer as far as possible;
s14) before the water pump is installed, washing the well by an air compression method;
s15), installing a water pump, checking, and then performing trial water pumping to check whether water pumping equipment and a water pumping and draining system can meet precipitation requirements;
s16) excavating a water collecting pool according to the positioning, wherein the capacity of the water collecting pool is larger than the product of the capacity of a precipitation well communicated with the water collecting pool and the local average monthly precipitation; then adopting slurry to protect the wall;
s17), immediately cleaning the water pipe after the excavation is finished, and then communicating the water pipe with the water outlet of the water pump.
Further, in step S13), after the well pipe is put in, the space between the well pipe and the hole wall is backfilled with a filter material to prevent collapse, and the well point is backfilled to be dense within a range of 50-100cm below the ground surface with clay.
Further, the S2) specifically includes the following steps:
s21) preparing a small catheter; pouring concrete into the small guide pipe, and vibrating, compacting and finally setting to obtain the small guide pipe for pouring concrete;
s22) supporting construction of a supporting frame; installing and fixing a support frame in the tunnel; measuring and positioning the tunnel at the position of the support frame, determining a small guide pipe construction hole position and drilling, wherein the drilling direction and the tunnel direction form an acute angle;
s23) installing a small concrete injection guide pipe; and (4) driving the small concrete-injected guide pipes into each drilling hole position, and fixedly connecting each small concrete-injected guide pipe with the support frame respectively.
Furthermore, the small guide pipe passes through a seamless steel pipe with one end being conical, and the aggregate grain size of the poured concrete does not exceed 1/5 of the inner diameter of the small guide pipe.
Further, the step S3) includes dividing the tunnel into an upper left hole, a middle left hole, a lower left hole, an upper right hole, a middle right hole, and a lower right hole, and includes the following steps:
s31) grouting above the upper left hole, and then excavating the upper left hole; excavating a rear vertical grid steel frame, driving a foot locking anchor rod, and then spraying concrete; completing primary lining support of the upper left hole;
s32) after the left upper hole is excavated for 3m, grouting above the right upper hole, beginning to excavate the right upper hole, erecting a grid steel frame, and spraying concrete to complete primary lining support of the right upper hole;
s33) lagging behind the upper right hole by 6m, and then excavating a left middle hole; excavating a rear vertical grid steel frame, driving a foot locking anchor rod, and then spraying concrete; completing primary lining support of the left middle hole;
s34) after the distance lags behind the left middle hole by 3m, excavating the right middle hole, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; completing primary lining support of the right middle hole;
s35) after 6m of the right middle hole, excavating a left lower hole, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; completing primary lining support of the left lower hole;
s36) excavating a right lower hole after lagging behind the right middle hole by 3m, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; and finishing primary lining support of the lower right hole.
Further, the S4) includes the following specific steps:
s41) waterproof layer construction;
s42) second lining construction;
the construction of the waterproof layer comprises the following steps:
s411) hanging the geotextile: loading the geotextile on a bracket of the waterproof board laying trolley, pulling out the geotextile, feeding the geotextile into the center of a reel of the waterproof board laying trolley, keeping the axis of the geotextile vertical to the reel of the waterproof board laying trolley, and clamping the geotextile; starting a 'geotextile rolling' mode of the waterproof board laying trolley, and rolling the geotextile from a bracket of the waterproof board laying trolley onto a reel of a crawling trolley of the waterproof board laying trolley; the geotextiles on the reel of the crawling trolley are symmetrically distributed; starting a crawling trolley of the waterproof board laying trolley, laying geotextile, and starting a jacking system of the waterproof board laying trolley to jack the geotextile to the primary support surface; and fixing the geotextile on the surface of the primary support by using the hot-melt gasket to finish the laying of the geotextile ring.
S412) laying, fixing and welding the waterproof board; firstly, correctly marking a longitudinal central line of a tunnel on a geotextile buffer layer at the top of a tunnel arch, then enabling the central line of a waterproof board to coincide with the central line of the tunnel, laying the waterproof board from the arch top to two sides like geotextile, performing hot-melt welding on the edge laying side and a round gasket, and performing hot-melt welding on the waterproof board and the round gasket; the waterproof board is laid along the circumferential direction of the tunnel, and the laying length of the waterproof board is the same as that of the geotextile;
s413) waterproof treatment of construction joints: the annular construction joint is sealed by adopting an externally-attached rubber water stop and a middle-embedded rubber water stop, and the longitudinal construction joint is sealed by a middle-embedded steel-edge water stop and a water-swelling rubber water stop.
Further, the S42) secondary lining construction is carried out, and an integral hydraulic lining trolley is adopted for construction; the method comprises the following specific steps:
s421) binding reinforcing steel bars in the tunnel to form a plurality of reinforcing steel bar bundles, binding to form reinforcing steel bar net sheets, lifting the reinforcing steel bar net sheets to installation positions through the integral hydraulic lining trolley, binding adjacent reinforcing steel bar net sheets to form longitudinal and transverse reinforcing steel bars to be connected into a whole, and forming the reinforcing steel bar net
S422) pumping and stirring the initially-solidified concrete to side wall bodies on two sides of the tunnel until the concrete is flush with half of the width of the waterproof steel strip to form a two-lining main body structure.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
The invention discloses a construction process of a saturated loess 12m large-span small-clear-distance tunnel, which comprises the following steps of:
s1) precipitation before construction;
s11) positioning and clearly identifying the precipitation well and the water collecting pool according to the design scheme and the actual site;
s12) adopting impact drilling to form a hole, wherein the aperture meets the requirement of placing a submersible pump in a water pumping pipe; then adopting slurry to protect the wall;
s13) cleaning the hole immediately after the hole is formed, and mounting a well pipe, wherein a filter pipe part of the well pipe is placed at the position of the permeable layer as far as possible;
s14) before the water pump is installed, washing the well by an air compression method;
s15), installing a water pump, checking, and then performing trial water pumping to check whether water pumping equipment and a water pumping and draining system can meet precipitation requirements;
s16) excavating a water collecting pool according to the positioning, wherein the capacity of the water collecting pool is larger than the product of the capacity of a precipitation well communicated with the water collecting pool and the local average monthly precipitation; then adopting slurry to protect the wall;
s17), after the excavation is finished, immediately cleaning, and then communicating with a water outlet of a water pump through a water pumping pipe;
s2) forepoling construction;
s21) preparing a small catheter; pouring concrete into the small guide pipe, and vibrating, compacting and finally setting to obtain the small guide pipe for pouring concrete;
s22) supporting construction of a supporting frame; installing and fixing a support frame in the tunnel; measuring and positioning the tunnel at the position of the support frame, determining a small guide pipe construction hole position and drilling, wherein the drilling direction and the tunnel direction form an acute angle;
s23) installing a small concrete injection guide pipe; and (4) driving the small concrete-injected guide pipes into each drilling hole position, and fixedly connecting each small concrete-injected guide pipe with the support frame respectively.
S3) tunnel excavation and primary lining support are carried out;
the step S3) includes the steps of dividing the tunnel into a left upper hole, a left middle hole, a left lower hole, a right upper hole, a right middle hole and a right lower hole:
s31) grouting above the upper left hole, and then excavating the upper left hole; excavating a rear vertical grid steel frame, driving a foot locking anchor rod, and then spraying concrete; completing primary lining support of the upper left hole;
s32) after the left upper hole is excavated for 3m, grouting above the right upper hole, beginning to excavate the right upper hole, erecting a grid steel frame, and spraying concrete to complete primary lining support of the right upper hole;
s33) lagging behind the upper right hole by 6m, and then excavating a left middle hole; excavating a rear vertical grid steel frame, driving a foot locking anchor rod, and then spraying concrete; completing primary lining support of the left middle hole;
s34) after the distance lags behind the left middle hole by 3m, excavating the right middle hole, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; completing primary lining support of the right middle hole;
s35) after 6m of the right middle hole, excavating a left lower hole, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; completing primary lining support of the left lower hole;
s36) excavating a right lower hole after lagging behind the right middle hole by 3m, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; primary lining support for completing right lower hole
S4) waterproof layer and secondary lining support;
s41) waterproof layer construction;
s42) second lining construction;
the construction of the waterproof layer comprises the following steps:
s411) hanging the geotextile: loading the geotextile on a bracket of the waterproof board laying trolley, pulling out the geotextile, feeding the geotextile into the center of a reel of the waterproof board laying trolley, keeping the axis of the geotextile vertical to the reel of the waterproof board laying trolley, and clamping the geotextile; starting a 'geotextile rolling' mode of the waterproof board laying trolley, and rolling the geotextile from a bracket of the waterproof board laying trolley onto a reel of a crawling trolley of the waterproof board laying trolley; the geotextiles on the reel of the crawling trolley are symmetrically distributed; starting a crawling trolley of the waterproof board laying trolley, laying geotextile, and starting a jacking system of the waterproof board laying trolley to jack the geotextile to the primary support surface; and fixing the geotextile on the surface of the primary support by using the hot-melt gasket to finish the laying of the geotextile ring.
S412) laying, fixing and welding the waterproof board; firstly, correctly marking a longitudinal central line of a tunnel on a geotextile buffer layer at the top of a tunnel arch, then enabling the central line of a waterproof board to coincide with the central line of the tunnel, laying the waterproof board from the arch top to two sides like geotextile, performing hot-melt welding on the edge laying side and a round gasket, and performing hot-melt welding on the waterproof board and the round gasket; the waterproof board is laid along the circumferential direction of the tunnel, and the laying length of the waterproof board is the same as that of the geotextile;
s413) waterproof treatment of construction joints: the annular construction joint is sealed by adopting an externally-attached rubber water stop and a middle-embedded rubber water stop, and the longitudinal construction joint is sealed by a middle-embedded steel-edge water stop and a water-swelling rubber water stop.
Further, the S42) secondary lining construction is carried out, and an integral hydraulic lining trolley is adopted for construction; the method comprises the following specific steps:
s421) binding reinforcing steel bars in the tunnel to form a plurality of reinforcing steel bar bundles, binding to form reinforcing steel bar net sheets, lifting the reinforcing steel bar net sheets to installation positions through the integral hydraulic lining trolley, binding adjacent reinforcing steel bar net sheets to form longitudinal and transverse reinforcing steel bars to be connected into a whole, and forming the reinforcing steel bar net
S422) pumping and stirring the initially-solidified concrete to side wall bodies on two sides of the tunnel until the concrete is flush with half of the width of the waterproof steel strip to form a two-lining main body structure.
Wherein, precipitation before construction in S1) is realized by a precipitation well and a water collection pool; the water collecting tank is arranged far away from the tunnel excavation site and is communicated with the dewatering well; and the excavation site of the water collecting tank and the tunnel is not less than 2 km.
Wherein, in the step S13), after the well pipe is put in, the space between the well pipe and the hole wall is backfilled by using filter materials to prevent collapse, and the well point is backfilled and compacted by using clay within the range of 50-100cm below the ground.
The small guide pipe passes through a seamless steel pipe with one conical end, and the aggregate particle size of the poured concrete does not exceed 1/5 of the inner diameter of the small guide pipe.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. Saturated loess 12m large-span small-clear-distance tunnel construction technology is characterized by comprising the following steps of:
s1) precipitation before construction;
s2) forepoling construction;
s3) tunnel excavation and primary lining support are carried out;
s4) waterproof layer and secondary lining support;
wherein, precipitation before construction in S1) is realized by a precipitation well and a water collection pool; the water collecting tank is arranged far away from the tunnel excavation site and is communicated with the dewatering well; and the excavation site of the water collecting tank and the tunnel is not less than 2 km.
2. The saturated loess 12m large-span small-clear-distance tunnel construction process as claimed in claim 1, wherein: the construction step of S1) is as follows:
s11) positioning and clearly identifying the precipitation well and the water collecting pool according to the design scheme and the actual site;
s12) adopting impact drilling to form a hole, wherein the aperture meets the requirement of placing a submersible pump in a water pumping pipe; then adopting slurry to protect the wall;
s13) cleaning the hole immediately after the hole is formed, and mounting a well pipe, wherein a filter pipe part of the well pipe is placed at the position of the permeable layer as far as possible;
s14) before the water pump is installed, washing the well by an air compression method;
s15), installing a water pump, checking, and then performing trial water pumping to check whether water pumping equipment and a water pumping and draining system can meet precipitation requirements;
s16) excavating a water collecting pool according to the positioning, wherein the capacity of the water collecting pool is larger than the product of the capacity of a precipitation well communicated with the water collecting pool and the local average monthly precipitation; then adopting slurry to protect the wall;
s17), immediately cleaning the water pipe after the excavation is finished, and then communicating the water pipe with the water outlet of the water pump.
3. The saturated loess 12m large-span small-clear-distance tunnel construction process as claimed in claim 2, wherein: in step S13), after the well pipe is put in, the space between the well pipe and the hole wall is backfilled by using filter materials to prevent collapse, and the well point is backfilled to be compact in a range of 50-100cm below the ground by using clay.
4. The saturated loess 12m large-span small-clear-distance tunnel construction process as claimed in any one of claims 1 ~ 3, wherein the S2) comprises the following steps:
s21) preparing a small catheter; pouring concrete into the small guide pipe, and vibrating, compacting and finally setting to obtain the small guide pipe for pouring concrete;
s22) supporting construction of a supporting frame; installing and fixing a support frame in the tunnel; measuring and positioning the tunnel at the position of the support frame, determining a small guide pipe construction hole position and drilling, wherein the drilling direction and the tunnel direction form an acute angle;
s23) installing a small concrete injection guide pipe; and (4) driving the small concrete-injected guide pipes into each drilling hole position, and fixedly connecting each small concrete-injected guide pipe with the support frame respectively.
5. The saturated loess 12m large-span small-clear-distance tunnel construction process as claimed in claim 4, wherein: the small guide pipe passes through a seamless steel pipe with one conical end, and the aggregate particle size of the poured concrete does not exceed 1/5 of the inner diameter of the small guide pipe.
6. The construction process of the saturated loess 12m large-span small-clear-distance tunnel according to any one of claims 1 ~ 3 and 4, wherein the S3) comprises the following steps of:
s31) grouting above the upper left hole, and then excavating the upper left hole; excavating a rear vertical grid steel frame, driving a foot locking anchor rod, and then spraying concrete; completing primary lining support of the upper left hole;
s32) after the left upper hole is excavated for 3m, grouting above the right upper hole, beginning to excavate the right upper hole, erecting a grid steel frame, and spraying concrete to complete primary lining support of the right upper hole;
s33) lagging behind the upper right hole by 6m, and then excavating a left middle hole; excavating a rear vertical grid steel frame, driving a foot locking anchor rod, and then spraying concrete; completing primary lining support of the left middle hole;
s34) after the distance lags behind the left middle hole by 3m, excavating the right middle hole, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; completing primary lining support of the right middle hole;
s35) after 6m of the right middle hole, excavating a left lower hole, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; completing primary lining support of the left lower hole;
s36) excavating a right lower hole after lagging behind the right middle hole by 3m, erecting a grid steel frame, driving a foot locking anchor rod, and spraying concrete; and finishing primary lining support of the lower right hole.
7. The construction process of the saturated loess 12m large-span small-clear-distance tunnel as claimed in any one of claims 1 ~ 3 and 4, wherein the S4) comprises the following steps:
s41) waterproof layer construction;
s42) second lining construction;
the construction of the waterproof layer comprises the following steps:
s411) hanging the geotextile: loading the geotextile on a bracket of the waterproof board laying trolley, pulling out the geotextile, feeding the geotextile into the center of a reel of the waterproof board laying trolley, keeping the axis of the geotextile vertical to the reel of the waterproof board laying trolley, and clamping the geotextile; starting a 'geotextile rolling' mode of the waterproof board laying trolley, and rolling the geotextile from a bracket of the waterproof board laying trolley onto a reel of a crawling trolley of the waterproof board laying trolley; the geotextiles on the reel of the crawling trolley are symmetrically distributed; starting a crawling trolley of the waterproof board laying trolley, laying geotextile, and starting a jacking system of the waterproof board laying trolley to jack the geotextile to the primary support surface; fixing the geotextile on the surface of the primary support by using a hot-melt gasket to finish the laying of a ring of geotextile;
s412) laying, fixing and welding the waterproof board; firstly, correctly marking a longitudinal central line of a tunnel on a geotextile buffer layer at the top of a tunnel arch, then enabling the central line of a waterproof board to coincide with the central line of the tunnel, laying the waterproof board from the arch top to two sides like geotextile, performing hot-melt welding on the edge laying side and a round gasket, and performing hot-melt welding on the waterproof board and the round gasket; the waterproof board is laid along the circumferential direction of the tunnel, and the laying length of the waterproof board is the same as that of the geotextile;
s413) waterproof treatment of construction joints: the annular construction joint is sealed by adopting an externally-attached rubber water stop and a middle-embedded rubber water stop, and the longitudinal construction joint is sealed by a middle-embedded steel-edge water stop and a water-swelling rubber water stop.
8. The saturated loess 12m large-span small-clear-distance tunnel construction process as claimed in claim 7, wherein: s42), secondary lining construction, namely, construction by adopting an integral hydraulic lining trolley; the method comprises the following specific steps:
s421) binding reinforcing steel bars in the tunnel to form a plurality of reinforcing steel bar bundles, binding to form reinforcing steel bar net sheets, lifting the reinforcing steel bar net sheets to installation positions through the integral hydraulic lining trolley, binding adjacent reinforcing steel bar net sheets to form longitudinal and transverse reinforcing steel bars to be connected into a whole, and forming the reinforcing steel bar net
S422) pumping and stirring the initially-solidified concrete to side wall bodies on two sides of the tunnel until the concrete is flush with half of the width of the waterproof steel strip to form a two-lining main body structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911203260.8A CN110714772A (en) | 2019-11-29 | 2019-11-29 | Construction process of saturated loess 12m large-span small-clear-distance tunnel |
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| CN108194136A (en) * | 2017-12-31 | 2018-06-22 | 中铁十九局集团第二工程有限公司 | Lining construction method |
| CN109653749A (en) * | 2018-11-30 | 2019-04-19 | 中铁二局第五工程有限公司 | A kind of loose slide rock rubble soil section tunnel excavation construction method of high altitude localities shallow embedding |
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| CN105507337A (en) * | 2015-12-09 | 2016-04-20 | 中铁建大桥工程局集团第五工程有限公司 | Construction process combining high-pressure jet grouting pile with precipitation construction interconnecting channel |
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