CN114017057B - Construction method for cast-in-situ concrete wind channel separator of plateau railway tunnel double-lane trackless transportation auxiliary tunnel - Google Patents
Construction method for cast-in-situ concrete wind channel separator of plateau railway tunnel double-lane trackless transportation auxiliary tunnel Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 15
- 238000005192 partition Methods 0.000 claims abstract description 34
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 77
- 239000010959 steel Substances 0.000 claims description 77
- 238000013461 design Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 6
- 241001330002 Bambuseae Species 0.000 claims description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 6
- 239000011425 bamboo Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 239000011120 plywood Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 239000000565 sealant Substances 0.000 claims description 2
- 238000009423 ventilation Methods 0.000 description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 238000007665 sagging Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013524 weatherproof sealant Substances 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
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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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
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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
- E21D11/14—Lining predominantly with metal
- E21D11/15—Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
- E21D11/152—Laggings made of grids or nettings
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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
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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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
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a construction method of a cast-in-situ concrete wind channel separator of a plateau railway tunnel double-lane trackless transportation auxiliary tunnel, which belongs to the technical field of tunnel engineering construction and comprises the following steps of S1, measuring the point position of an embedded drain pipe; s2, installing an embedded drain pipe; s3, measuring the point positions of the embedded channels; s4, installing an embedded channel and embedded bars; s5, pouring secondary lining concrete; s6, demolding the second lining and removing the embedded channel; s7, installing a bottom die; s8, installing partition plate reinforcing steel bars; s9, pouring partition plate concrete; s10, sealing treatment. The construction by adopting the method can follow the secondary lining construction, does not influence the passing of construction vehicles, greatly shortens the construction period and has extremely wide popularization value.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering construction, and particularly discloses a construction method of a cast-in-situ concrete canal baffle of a double-lane trackless transportation auxiliary tunnel of a plateau railway tunnel.
Background
Along with the increasing expansion of railway construction scale, the proportion of the altitude tunnel is larger and larger, the tunnel setting length is longer and longer, the auxiliary tunnel needs to be arranged for construction, a plurality of working surfaces need to be constructed simultaneously after the auxiliary tunnel enters the main tunnel, and the ventilation with multiple working surfaces at a long distance needs to be realized. Aiming at the unique climate characteristics of the plateau and the existence of high-ground temperature sections in the tunnel, the auxiliary tunnel ventilation function is particularly necessary, and the choice of an economic and efficient ventilation mode greatly improves the construction environment in the tunnel of the plateau. The conventional wind belt type ventilation of the plateau tunnel has the problems of easiness in bending of the wind belt, high ventilation resistance, high air leakage rate, high wind belt loss, low ventilation efficiency and the like. The duct type ventilation is a ventilation mode capable of guaranteeing a ventilation section and extremely low air leakage rate, avoids the loss of a large amount of air belts in the traditional air belt type ventilation, and is an economical and efficient ventilation mode. The construction of the canal baffle is a foundation of canal ventilation, the construction efficiency of the foundation influences the whole construction period, but the construction of the canal baffle and construction vehicles influence each other, and the construction efficiency is influenced.
Disclosure of Invention
The invention aims to provide a construction method of a cast-in-situ concrete canal baffle of a double-lane trackless transportation auxiliary tunnel of a plateau railway tunnel, which can immediately follow secondary lining construction, does not influence the passing of construction vehicles and can greatly shorten the construction period.
In order to achieve the purpose, the invention provides a construction method of a cast-in-situ concrete canal baffle of a double-lane trackless transportation auxiliary tunnel of a plateau railway tunnel, which comprises the following steps:
s1, measuring the point position of a pre-buried drain pipe
The method comprises the steps that drainage pipes are arranged at equal height positions on two sides of the designed height of the air duct partition plate at equal intervals along the longitudinal direction of an auxiliary tunnel and used for drainage of air duct catchment, and after two lining trolleys are positioned, the design elevation of the top water inlet of each drainage pipe is determined on the two lining trolley panels through measurement;
s2, installing a pre-buried drain pipe
According to the measurement point position of the embedded drain pipe, the embedded drain pipe is installed on the surface of the secondary lining trolley, the distance between the drain pipe and the surface protection layer of the secondary lining trolley is not smaller than the preset thickness, a tunnel drain side ditch is introduced into the bottom of the drain pipe, and a switch valve is arranged at the lower part of the drain pipe;
s3, measuring the point positions of the embedded channels
Positioning the embedded channel according to the design elevation of the transverse steel bars of the air channel partition plates, reserving preset heights as operation spaces respectively at the upper and lower sides of the design elevation of the transverse steel bars of the two layers of air channel partition plates, and determining the height of the embedded channel;
s4, installing embedded channels and embedded bars
The embedded channels are made of wood plates, the embedded channels on two sides are arranged along the longitudinal through length of the auxiliary tunnel, and the embedded channels are grooved at the embedded bar passing positions;
double-layer annular embedded bars are arranged in the two liners at two sides of the design height of the wind tunnel partition board, the annular length of the double-layer annular embedded bars is larger than the thickness of the wind tunnel partition board, outer-layer steel bars of the double-layer annular embedded bars are positioned outside the embedded channel, inner-layer steel bars penetrate through the embedded channel, the double-layer annular embedded bars are provided with steel bar protection layers, and a plurality of groups of double-layer annular embedded bars are arranged at equal intervals along the longitudinal direction of the auxiliary tunnel;
longitudinal embedded bars I are arranged on the inner side of the outer layer steel bar and the outer side of the inner layer steel bar of the double-layer circumferential embedded bars, a plurality of groups of longitudinal embedded bars I are arranged at equal intervals along the circumferential direction of the two liners, two longitudinal embedded bars II are arranged at the designed elevation position of the transverse steel bar of the air duct partition plate, and the longitudinal embedded bars II are positioned on the outer side of the outer layer steel bar of the double-layer circumferential embedded bars;
binding the crossing positions of the double-layer circumferential embedded bars and the longitudinal embedded bars, and arranging stirrups at the crossing positions of the double-layer circumferential embedded bars and the longitudinal embedded bars I;
the transverse steel bars of the air duct partition plate comprise transverse embedded steel bars and transverse connecting steel bars, the transverse embedded steel bars are arranged in the second lining and are arranged at equal intervals along the longitudinal direction of the auxiliary tunnel, the transverse embedded steel bars penetrate through the embedded channel, the end parts outside the embedded channel are processed into hooks, the hooks are downwards connected with the longitudinal embedded steel bars II, the end parts inside the embedded channel are provided with thick straight threads, the wire heads wear protective caps, and the inside of the embedded channel is filled;
s5, pouring secondary lining concrete
S6, demolding and removing the embedded channel by using the second lining
The secondary lining concrete meets the demoulding requirement, the secondary lining trolley is demoulded, the elevation of the embedded channel is retested, and the embedded channel is cleaned to expose the transverse embedded bar wire opening;
s7, installing a bottom die
The construction of the wind canal baffle adopts a walkable rack provided with a door opening, the length of the walkable rack is not less than that of a two-lining trolley, the width and the height of the door opening are set according to the sizes of common mechanical equipment and vehicles, the walkable rack is provided with a hydraulic operating system and a walking track, the rack is lifted by a hydraulic jack, and the top of the walkable rack is provided with an operating platform;
arching is carried out on the bottom die of the air duct partition plate;
s8, installing partition plate reinforcing steel bars
The two ends of the transverse connecting steel bars are provided with thick straight threads, the transverse connecting steel bars are connected with the transverse embedded steel bars by adopting mechanical sleeves, cushion blocks are uniformly arranged at the bottoms of the transverse connecting steel bars, longitudinal connecting steel bars are arranged at the upper side and the lower side of the two layers of transverse connecting steel bars, the longitudinal connecting steel bars are arranged at equal intervals along the transverse direction of the auxiliary tunnel, and the crossing positions of the transverse connecting steel bars and the longitudinal connecting steel bars are bound and hooped;
s9, pouring partition plate concrete
S10, sealing treatment
Demoulding is carried out after the concrete strength of the partition plate meets the requirement, and sealing treatment is carried out on transverse construction joints between adjacent wind channel partition plates and joints between the two adjacent wind channel partition plates and the two lining concrete.
Further, in step S3, after determining the height of the embedded channel, the height point of the bottom of the embedded channel is measured at equal intervals.
Further, in step S7, the arch is formed by arranging square timber to form arch ribs, and the bottom die is fully laid by adopting bamboo plywood, and the arch ribs are longitudinally and equidistantly arranged.
Further, in step S9, after the installation of the steel bars is completed, a bamboo plywood closed end mould is used, and grooving treatment is adopted for the end mould to ensure that the extending length of the longitudinal connecting steel bars meets the lap welding length requirement;
after the concrete pouring is completed, the top surface is subjected to trowelling and surface finishing treatment, and water inlets of the drain pipes are reserved at the two sides to form water channels.
Further, in step S10, a water-neutral silicone weather-resistant sealant is used to seal the transverse construction joint between adjacent canal separators and the joint between the two lining concrete.
The invention has the following beneficial effects.
The construction method of the cast-in-situ concrete canal baffle of the plateau railway tunnel double-lane trackless transportation auxiliary tunnel can immediately follow secondary lining construction, does not influence the passing of construction vehicles, greatly shortens the construction period, has extremely wide popularization value, can form an economic and efficient canal type ventilation structure, has stable ventilation section, large ventilation quantity, small ventilation resistance, extremely low air leakage rate, high ventilation efficiency, avoids the loss of a wind band and extremely low later maintenance cost, and can be used as an operation ventilation channel compared with the traditional wind band type ventilation mode.
Drawings
FIG. 1 is a process flow diagram of a construction method of a cast-in-situ concrete duct diaphragm of a plateau railway tunnel double-lane trackless transportation auxiliary tunnel;
FIG. 2 is a layout diagram of a construction method of a cast-in-situ concrete canal separator for a double-lane trackless transportation auxiliary tunnel of a plateau railway tunnel;
FIG. 3 is an enlarged view of the pre-buried channel portion of FIG. 2;
fig. 4 is a schematic arching view of the bottom die.
In the figure: the novel tunnel is characterized by comprising the following components of a 1-drain pipe, a 2-tunnel drain side ditch, a 3-switch valve, a 4-embedded channel, a 5-secondary lining, a 6-double-layer circumferential embedded bar, a 7-longitudinal embedded bar I, an 8-longitudinal embedded bar II, a 9-stirrup, a 10-transverse embedded bar, a 11-transverse connecting bar, a 12-mechanical sleeve, a 13-walkable bench, a 14-wind channel partition board, a 15-longitudinal connecting bar, a 16-arch rib and a 17-arch height.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment takes a Sichuan line double-lane II type auxiliary tunnel as an example to describe the construction method of the cast-in-situ concrete canal baffle in detail, and the method comprises the following steps.
1. Measuring the point position of the embedded drain pipe
At equal height positions on two sides of the designed height of the canal diaphragm, a drain pipe 1 is arranged at intervals of 50m along the longitudinal direction of the auxiliary tunnel for draining the canal catchment. After the two lining trolleys are positioned, the design elevation of the top water inlet of each drain pipe 1 is determined on the two lining trolley panels through measurement.
2. Mounting pre-buried drain pipe
According to the measurement point position of the embedded drain pipe, a drain pipe 1 with the pre-specification of phi 100UPVC is installed on the surface of the secondary lining trolley, the distance between the drain pipe 1 and the surface protection layer of the secondary lining trolley is not less than 5cm, a tunnel drain side ditch 2 is introduced into the bottom of the drain pipe 1, and a switch valve 3 is arranged at the lower part of the drain pipe 1.
3. Measuring the point position of the embedded channel
The embedded channel 4 is positioned according to the design elevation of the transverse steel bars of the wind channel partition, 5cm is reserved up and down according to the design elevation of the transverse steel bars of the two layers of wind channel partition to serve as an operation space, the height of the embedded channel 4 is determined, and the height point position of the bottom of the embedded channel 4 is measured according to the 5m distance, so that the observation and the positioning are facilitated.
4. Installing embedded channel and embedded bar
The embedded channels 4 are made of wood plates with the depth of 2cm and the center depth of 20cm, the embedded channels 4 on two sides are arranged along the longitudinal through length of the auxiliary tunnel, and the embedded channels 4 are grooved at the embedded bar passing positions.
Double-layer annular embedded bars 6 are arranged in the two liners 5 at the two sides of the design height of the wind channel baffle, the annular length is about 1m, and the specification is that
22 steel bars, the outer layer steel bars of the double-layer circumferential embedded steel bars 6 are positioned outside the embedded channel 4, the inner layer steel bars penetrate through the embedded channel 4, the longitudinal spacing is 20cm, and the thickness of the steel bar protection layer is 5cm.
Longitudinal embedded bars I7 are arranged on the inner side of the outer layer steel bar and the outer side of the inner layer steel bar of the double-layer circumferential embedded bar 6, and the specification is that
14 steel bars with a circumferential spacing of 25cm. At the designed elevation position of the transverse steel bars of the canal baffle, two longitudinal embedded steel bars II 8 are arranged, the longitudinal embedded steel bars II 8 are positioned at the outer side of the outer layer steel bars of the double-layer annular embedded steel bars 6, and the specification is +.>
14 rebar.
Binding is carried out at the crossing position of the double-layer circumferential embedded bars 6 and the longitudinal embedded bars, hooping 9 is arranged at the crossing position of the double-layer circumferential embedded bars 6 and the longitudinal embedded bars I7, the specification of the hooping 9 is phi 8, the circumferential spacing is 25cm, and the longitudinal spacing is 20cm, and the hooping is arranged in a quincuncial shape.
The transverse steel bars of the canal baffle comprise transverse embedded steel bars 10 and transverse connecting steel bars 11, and the specification is that
20 reinforcing bars, transverse embedded bars 10 are arranged inside a secondary lining 5 and are arranged at equal intervals along the longitudinal direction of an auxiliary tunnel, the thickness of a reinforcing bar protection layer is 5cm, the transverse embedded bars 10 penetrate through an embedded channel 4, the end parts outside the embedded channel 4 are processed into hooks of 135 degrees, the hooks are connected with a longitudinal embedded bar II downwards, in order to solve the problem that the lap joint length of transverse embedded bars 10 and a rear-mounted transverse connecting bar 11 is insufficient, the transverse embedded bars are connected with a mechanical sleeve 12 through pier thick straight threads, the end parts of the transverse embedded bars 10, which are located in the embedded channel, are required to be subjected to pier thick straight threads, a protective cap is worn by a wire head to prevent wire mouth pollution, and the inside of the embedded channel 4 is filled with foam.
All the crossing parts of the reinforcing steel bars are firmly bound by iron wires. The embedded channel 4, the embedded bars and the two lining trolley panels are fixed firmly to prevent displacement.
5. Pouring secondary lining concrete
In the process of pouring concrete, the embedded channel 4 and the embedded bar part are protected, and displacement caused by over vibration is prevented.
6. Two lining drawing of patterns and demold pre-buried channel
And the secondary lining concrete reaches 75% of the design strength, the secondary lining trolley is demolded, and the elevation of the embedded channel 4 is retested. Cleaning filling foam, removing the wood boards of the embedded channels 4 and cleaning transparent adhesive tapes to expose the wire openings of the embedded bars.
7. Mounting bottom die
The construction of the canal baffle adopts a walkable rack provided with a door opening, and the length of the walkable rack 13 is not less than that of the two lining trolleys, so as to ensure that the construction joint of the canal baffle 14 and the two lining construction joint are in the same ring. The width and the height of the door opening are set according to the sizes of common mechanical equipment and vehicles so as to meet the traffic of the vehicles such as the empty concrete tank truck and the like. The walkable gantry 13 is provided with a hydraulic operating system and a walking rail, and is lifted and lowered by a hydraulic jack. A 5cm thick wood plate is fully paved on the top of the walking bench 13 to serve as a working platform.
The bottom form of the canal diaphragm 14 arches at 3/1000 of the span, and arches by machining 5cm square lumber to form arching ribs 16 to eliminate the sagging of the form during the concrete casting process. The bottom die is fully laid by adopting a bamboo plywood with the thickness of 1.22 multiplied by 2.44 multiplied by 0.012m, and the arch rib 16 is arranged at intervals of 1m in the longitudinal direction.
8. Reinforcing steel bar for installing partition plate
The longitudinal distance between the transverse connection steel bars 11 is 20cm, the bottoms of the steel bars are provided with cushion blocks according to the weight of not less than 4/m 2 Setting, evenly distributing and binding firmly to ensure that the thickness of the bottom reinforcement protection layer is not less than 5cm. The transverse connecting steel bars 10 are connected with the transverse embedded steel bars 11 by adopting mechanical sleeves 12, other parts are connected in a lap joint mode by adopting welding, and the lap joint welding length meets the requirements of single-sided welding 10d and double-sided welding 5 d.
Longitudinal connecting bars 15 are arranged on the upper side and the lower side of the two layers of transverse connecting bars 11, and the specification is that
14 steel bars, wherein the transverse spacing is 25cm, the crossing position of the transverse connection steel bars 11 and the longitudinal connection steel bars 15 is firmly bound by iron wires, phi 8 stirrups 9 are arranged, the transverse spacing of the stirrups 9 is 25cm, and the longitudinal spacing is 20cm, and the stirrups are arranged in a quincuncial shape.
9. Pouring partition plate concrete
After the steel bar is installed, a bamboo plywood closed end mould is used, and grooving treatment is adopted for the end mould to ensure that the extending length of the longitudinal connecting steel bar 15 meets the lap welding length requirement. And pumping C35 concrete to pour the canal diaphragm 14, wherein in the process of pouring the diaphragm concrete, attention is paid to strengthening the vibration of the connection part with the secondary lining concrete, and over-vibration is avoided. And after the concrete pouring is finished, the top surface is subjected to trowelling and finishing treatment. Water inlets of the reserved drain pipes on two sides need to be reserved with water channels.
10. Sealing treatment
And demolding after the concrete strength of the partition plate reaches 75% of the design value. And sealing the transverse construction joint and the two-lining concrete joint between the adjacent canal baffles 14 by adopting 5mm thick water-neutral silicone weather-proof sealant.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (5)
1. The construction method of the cast-in-situ concrete canal baffle of the auxiliary tunnel for the double-lane trackless transportation of the plateau railway tunnel is characterized by comprising the following steps of:
s1, measuring the point position of a pre-buried drain pipe
The method comprises the steps that drainage pipes are arranged at equal height positions on two sides of the designed height of the air duct partition plate at equal intervals along the longitudinal direction of an auxiliary tunnel and used for drainage of air duct catchment, and after two lining trolleys are positioned, the design elevation of the top water inlet of each drainage pipe is determined on the two lining trolley panels through measurement;
s2, installing a pre-buried drain pipe
According to the measurement point position of the embedded drain pipe, the embedded drain pipe is installed on the surface of the secondary lining trolley, the distance between the drain pipe and the surface protection layer of the secondary lining trolley is not smaller than the preset thickness, a tunnel drain side ditch is introduced into the bottom of the drain pipe, and a switch valve is arranged at the lower part of the drain pipe;
s3, measuring the point positions of the embedded channels
Positioning the embedded channel according to the design elevation of the transverse steel bars of the air channel partition plates, reserving preset heights as operation spaces respectively at the upper and lower sides of the design elevation of the transverse steel bars of the two layers of air channel partition plates, and determining the height of the embedded channel;
s4, installing embedded channels and embedded bars
The embedded channels are made of wood plates, the embedded channels on two sides are arranged along the longitudinal through length of the auxiliary tunnel, and the embedded channels are grooved at the embedded bar passing positions;
double-layer annular embedded bars are arranged in the two liners at two sides of the design height of the wind tunnel partition board, the annular length of the double-layer annular embedded bars is larger than the thickness of the wind tunnel partition board, outer-layer steel bars of the double-layer annular embedded bars are positioned outside the embedded channel, inner-layer steel bars penetrate through the embedded channel, the double-layer annular embedded bars are provided with steel bar protection layers, and a plurality of groups of double-layer annular embedded bars are arranged at equal intervals along the longitudinal direction of the auxiliary tunnel;
longitudinal embedded bars I are arranged on the inner side of the outer layer steel bar and the outer side of the inner layer steel bar of the double-layer circumferential embedded bars, a plurality of groups of longitudinal embedded bars I are arranged at equal intervals along the circumferential direction of the two liners, two longitudinal embedded bars II are arranged at the designed elevation position of the transverse steel bar of the air duct partition plate, and the longitudinal embedded bars II are positioned on the outer side of the outer layer steel bar of the double-layer circumferential embedded bars;
binding the crossing positions of the double-layer circumferential embedded bars and the longitudinal embedded bars, and arranging stirrups at the crossing positions of the double-layer circumferential embedded bars and the longitudinal embedded bars I;
the transverse steel bars of the air duct partition plate comprise transverse embedded steel bars and transverse connecting steel bars, the transverse embedded steel bars are arranged in the second lining and are arranged at equal intervals along the longitudinal direction of the auxiliary tunnel, the transverse embedded steel bars penetrate through the embedded channel, the end parts outside the embedded channel are processed into hooks, the hooks are downwards connected with the longitudinal embedded steel bars II, the end parts inside the embedded channel are provided with thick straight threads, the wire heads wear protective caps, and the inside of the embedded channel is filled;
s5, pouring secondary lining concrete
S6, demolding and removing the embedded channel by using the second lining
The secondary lining concrete meets the demoulding requirement, the secondary lining trolley is demoulded, the elevation of the embedded channel is retested, and the embedded channel is cleaned to expose the transverse embedded bar wire opening;
s7, installing a bottom die
The construction of the wind canal baffle adopts a walkable rack provided with a door opening, the length of the walkable rack is not less than that of a two-lining trolley, the width and the height of the door opening are set according to the sizes of common mechanical equipment and vehicles, the walkable rack is provided with a hydraulic operating system and a walking track, the rack is lifted by a hydraulic jack, and the top of the walkable rack is provided with an operating platform;
arching is carried out on the bottom die of the air duct partition plate;
s8, installing partition plate reinforcing steel bars
The two ends of the transverse connecting steel bars are provided with thick straight threads, the transverse connecting steel bars are connected with the transverse embedded steel bars by adopting mechanical sleeves, cushion blocks are uniformly arranged at the bottoms of the transverse connecting steel bars, longitudinal connecting steel bars are arranged at the upper side and the lower side of the two layers of transverse connecting steel bars, the longitudinal connecting steel bars are arranged at equal intervals along the transverse direction of the auxiliary tunnel, and the crossing positions of the transverse connecting steel bars and the longitudinal connecting steel bars are bound and hooped;
s9, pouring partition plate concrete
S10, sealing treatment
Demoulding is carried out after the concrete strength of the partition plate meets the requirement, and sealing treatment is carried out on transverse construction joints between adjacent wind channel partition plates and joints between the two adjacent wind channel partition plates and the two lining concrete.
2. The construction method of the cast-in-situ concrete canal diaphragm for the auxiliary tunnel for the double-lane trackless transportation of the plateau railway tunnel according to claim 1, wherein in the step S3, after the height of the embedded channel is determined, the height point positions of the bottom of the embedded channel are measured at equal intervals.
3. The construction method of the cast-in-situ concrete canal diaphragm for the double-lane trackless transportation auxiliary tunnel of the plateau railway tunnel according to claim 2, wherein in the step S7, arching is formed by arranging square timber, the bottom die is fully laid by adopting bamboo plywood, and the arching ribs are longitudinally arranged at equal intervals.
4. The construction method of the cast-in-situ concrete canal separator for the double-lane trackless transportation auxiliary tunnels of the plateau railway tunnel according to claim 3, wherein in the step S9, after the installation of the reinforcing steel bars is completed, a bamboo plywood closed end mould is used, and the end mould adopts grooving treatment to ensure that the extension length of the longitudinal connecting reinforcing steel bars meets the lap welding length requirement;
after the concrete pouring is completed, the top surface is subjected to trowelling and surface finishing treatment, and water inlets of the drain pipes are reserved at the two sides to form water channels.
5. The construction method of the cast-in-situ concrete canal diaphragm of the auxiliary tunnel for the double-lane trackless transportation of the plateau railway tunnel according to claim 4, wherein in the step S10, water-neutral silicone weather-resistant sealant is adopted to seal the transverse construction joint between the adjacent canal diaphragm and the joint with the secondary lining concrete.
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