CN110617073A - Construction method for air-propelled shield tunneling machine to integrally pass through curved air shaft - Google Patents
Construction method for air-propelled shield tunneling machine to integrally pass through curved air shaft Download PDFInfo
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- CN110617073A CN110617073A CN201910949266.3A CN201910949266A CN110617073A CN 110617073 A CN110617073 A CN 110617073A CN 201910949266 A CN201910949266 A CN 201910949266A CN 110617073 A CN110617073 A CN 110617073A
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- 238000010276 construction Methods 0.000 title claims abstract description 44
- 230000005641 tunneling Effects 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
- 239000004567 concrete Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 17
- 238000009415 formwork Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 230000000977 initiatory effect Effects 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000006855 networking Effects 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000001680 brushing effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect 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
- 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
- E21D11/08—Lining with building materials with preformed concrete slabs
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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
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
- E21D9/0609—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering with means for applying a continuous liner, e.g. sheets of plastics, between the main concrete lining and the rock
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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
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
- E21D9/122—Working or loading platforms
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a construction method for an air-propelled shield tunneling machine to integrally pass through a curved air shaft, wherein the section of a tunnel axis where the air shaft is located is a curve, and the construction method sequentially comprises the following steps: step one, constructing a concrete guide platform; secondly, pushing the air inlet shaft by the shield tunneling machine; and step three, passing the shield tunneling machine through a curve air shaft. The technical scheme adopts a concrete guide platform and a way of laying a guide rail, and utilizes the reverse thrust provided by assembling the negative ring canal sheets at the tail of the shield to ensure that the whole shield machine passes through the curved air shaft and the concrete guide platform poured by concrete, the concrete guide platform does not need to be dismantled at the later stage and can be used as an air shaft bottom plate, so that the construction cost of the air shaft bottom plate at the later stage is saved; the steel bracket does not need to be purchased, and the material cost is greatly reduced; the negative ring pipe piece providing the reverse thrust can directly select the old pipe piece and the pipe piece reconstructed by the old pipe piece, thereby reducing the material acquisition cost; the air-propelled shield machine integrally passes through the curve air shaft, the shield machine does not need to be disassembled, the total construction time is short, and the efficiency is high; due to the reduction of material purchase and the reduction of total construction time, the project management cost generated by the method is greatly reduced correspondingly.
Description
Technical Field
The invention relates to the field of shield construction, in particular to a construction method for an air-propelled shield machine to integrally pass through a curved air shaft.
Background
In the construction of subway intervals, if the distance between the tunnels is too long, an air shaft needs to be designed in the intervals, and two construction methods for the shield tunneling machine to pass through the air shaft conventionally are adopted: a split air shaft and an integral air shaft.
For the split air shaft, the shield body of the shield machine is disconnected from the trolley, and a reaction frame needs to be installed in the air shaft, so that the difficulty is high, the risk is high, and the construction period is long; for the whole air shaft, although the construction period is short, most of the guide devices are steel brackets, and the purchase, transportation and disassembly and assembly costs of the steel brackets are high.
The middle air shaft is generally arranged on the straight line segment according to the conventional design, however, due to the influence of the geographical environment of the tunnel path, some middle air shafts need to be arranged on the circular curve, and the difficulty is further increased in the mode of passing through the middle air shaft.
In the prior art, a better method for enabling the shield tunneling machine to pass through the curved air shaft integrally at low cost and high efficiency does not exist.
Disclosure of Invention
The invention aims to solve the technical problem of making up the defects of the prior art and provides a construction method for the air-propelled shield tunneling machine to integrally pass through a curve air shaft.
To solve the technical problems, the technical scheme of the invention is as follows: a construction method for an air-propelled shield tunneling machine to integrally pass through a curved air shaft is characterized in that the section of a tunnel axis where the air shaft is located is a curve, and the construction method sequentially comprises the following steps:
the method comprises the following steps: construction of concrete guide platform
Completing the construction of a concrete guide platform before the shield machine reaches a curved air shaft, wherein the concrete guide platform comprises ︺ -shaped grooves, and the symmetrical center lines of the ︺ -shaped grooves are consistent with the axis of the tunnel;
the first stage, measuring and setting out, accurately positioning through networking actual measurement, and strictly controlling the axis of the concrete guide platform to be consistent with the axis of the tunnel;
binding a steel bar structure, binding steel bars according to the position of measurement paying-off, and welding stirrups between the upper layer of steel bars and the lower layer of steel bars, wherein the outline of the steel bar structure is consistent with that of the concrete guide platform;
in the third stage, installing guide rail embedded parts, respectively welding a plurality of guide rail embedded parts on two inclined planes of an ︺ -shaped groove of the steel bar structure, and positioning the welding positions of the guide rail embedded parts through a total station;
the fourth stage, install the template;
fifthly, pouring concrete, wherein the concrete protective layer of the steel bar structure is not less than 5 cm;
in the sixth stage, guide rails are installed and welded on the guide rail embedded parts through small press plates, the guide rails are connected through a fishplate, the height of the guide rail at the receiving end is lower than that of the guide rail at the initiating end, and the height of the guide rail at the initiating end is a designed elevation;
step two: shield machine propulsion curve air shaft
In the first stage, when the shield machine is ready to enter a curved air shaft, adjusting a cutter to avoid the cutter from contacting a concrete guide table, adjusting each jack of the shield machine, and adjusting the posture of the shield machine; when the duct pieces are installed, the pressure of the pushing jack is set as the assembling pressure, after each duct piece is installed, the duct piece connecting screw rod is firstly and preliminarily fastened by manpower, and then a high-speed pneumatic trigger is used for fastening the bolt;
in the second stage, a shield is arranged on a concrete guide platform;
step three: curved air shaft of shield machine
In the first stage, steel rings are respectively arranged at the holes at the two ends of the curved air shaft, so that the starting negative ring pipe piece is immersed into the side wall of the starting end by 400 mm and 800 mm;
in the second stage, the front body of the shield machine is separated from a portal steel ring and enters a curved air shaft, a steel plate with the thickness of 30mm is welded at the bottom of the front body of the shield machine, a steel plate with the thickness of 35mm is welded at the bottom of the middle body of the shield machine, and a steel plate with the thickness of 40mm is welded at the bottom of the shield tail of the shield machine; the reverse thrust provided by assembling the negative ring duct pieces by the shield tail enables the whole shield machine to pass through the curve air shaft, and after the negative ring duct pieces are separated from the shield tail, the waist of the negative ring duct pieces is fixed on the side wall or the stand column of the curve air shaft through the H-shaped steel, so that the lateral displacement of the negative ring duct pieces is prevented.
Further, the curve radius of the tunnel axis line segment where the air shaft is located is 700 m.
Further, in the second stage of the first step, the steel bars are phi 16 thread steel, and the distance between every two adjacent steel bars is 200 mm.
Further, in the fourth stage of the first step, the installation sequence of the templates is as follows in sequence: and (3) supporting a formwork at one side, binding and fixing, installing a counter-pull water-stop bolt, supporting the formwork at the other side, correcting the position of the formwork, fastening the counter-pull water-stop bolt, and supporting and fixing.
Further, in the fourth stage of the first step, the mold plate is uniformly coated with a mold release agent before installation.
Furthermore, in the fifth stage of the first step, the concrete pouring mode is layered pouring, an inserted vibrator is adopted to carry out dense vibration, the speed is fast forward and slow out, the vibrator cannot be attached to a template, the mold expansion is avoided, the thickness of a pouring layer is not more than 1.25 times of the length of an action part of the vibrator, the moving distance of the vibrator is not more than 1.5 times of the action radius of the vibrator, the depth of the vibrator inserted into the concrete at the lower layer is 5-10 cm, the vibration duration time of each position is 20-30 seconds, and the concrete does not sink and bubbles do not appear.
Further, the thickness of each layer of concrete poured in layers is 30-40 cm.
Further, in a sixth stage of step one, the length of the guide rail is 3 m.
Further, in the sixth stage of the first step, the height of the guide rail at the receiving end is 50mm lower than that of the guide rail at the initiating end.
Furthermore, in the second stage of the third step, the old straight-line ring segments which are initially dismantled are adopted as the negative ring segments, and in order to meet the requirement of a curved track, a rubber plate is bonded between the adjacent negative ring segments at the turning positions, so that the center lines of the negative ring segments are consistent with the axis of the tunnel after the negative ring segments are butted.
The invention can achieve the following beneficial effects:
1. the method adopts a concrete guide platform and a way of laying guide rails, and utilizes the reverse thrust provided by assembling the negative ring pipe sheets at the tail of the shield to ensure that the whole shield machine passes through the curved air shaft, 1) the concrete guide platform poured by concrete does not need to be dismantled at the later stage and can be used as an air shaft bottom plate, thereby saving the construction cost of the air shaft bottom plate at the later stage; 2) the steel bracket does not need to be purchased, and the material cost is greatly reduced; 3) the negative ring pipe piece providing the reverse thrust can directly select the old pipe piece and the pipe piece reconstructed by the old pipe piece, thereby reducing the material acquisition cost;
2. the air-propelled shield machine integrally passes through the curve air shaft, the shield machine does not need to be disassembled, the total construction time is short, and the efficiency is high;
3. due to the reduction of material purchase and the reduction of total construction time, the project management cost generated by the method is greatly reduced correspondingly.
Drawings
FIG. 1 is a plan view of the arrangement of guide rail embedded parts on a concrete guide table along the axis of a tunnel in the embodiment of the invention;
FIG. 2 is a sectional view of a concrete guide table according to an embodiment of the present invention;
FIG. 3 is a view showing a fixed cross-section of a negative ring tube piece according to an embodiment of the present invention;
FIG. 4 is a top view of a negative loop piece arrangement in an embodiment of the invention;
FIG. 5 is a schematic perspective view of the negative ring segment and rubber plate bonding at a turn in the embodiment of the invention;
FIG. 6 is a schematic top view of the negative ring segment and rubber plate bonding at a turn in the embodiment of the present invention;
FIG. 7 is a schematic view of a rubber sheet according to an embodiment of the present invention;
FIG. 8 is a perspective view of a steel ring in an embodiment of the present invention;
FIG. 9 is a perspective view of a split body of a steel ring according to an embodiment of the present invention;
FIG. 10 is a schematic view of a connection structure of a guide rail embedded part, a guide rail and a small pressure plate in the embodiment of the invention;
in the figure: the concrete-reinforced concrete combined tunnel comprises 1-tunnel axis, 2-concrete guide table, 21-concrete, 22-reinforcing steel bar, 3-guide rail embedded parts, 4-negative ring pipe piece, 5-H-shaped steel cross brace, 6-H-shaped steel vertical brace, 7-guide rail, 8-H-shaped steel diagonal brace, 9-steel ring, 91-steel ring split body, 911-first connecting ring piece, 912-second connecting ring piece, 913-rib plate, 914-butt plate, 10-small pressing plate and 11-rubber plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Examples
The embodiment is applied to a region from a 5-king businessman station to a Pei-family camp station in the south-Ji rail transit R3 line, and the middle air shaft is designed on a circular curve of R =700 m.
A construction method for an air-propelled shield tunneling machine to integrally pass through a curve air shaft is characterized in that a tunnel axial line segment where the air shaft is located is a circular curve with the radius of 700m, and the construction method sequentially comprises the following steps:
the method comprises the following steps: construction of concrete guide platform 2
The concrete guide platform 2 is a lower support when the shield machine passes through the curved air shaft, the construction precision directly determines the posture of the shield machine, the construction of the concrete guide platform 2 is completed before the shield machine reaches the curved air shaft, the concrete guide platform 2 comprises ︺ -shaped grooves, and the symmetrical center line of ︺ -shaped grooves is consistent with the tunnel axis 1, as shown in fig. 1 and 2.
In the first stage, the measurement and the paying-off are carried out, the accurate positioning is carried out through the networking actual measurement, the axis of the concrete guide platform 2 is strictly controlled to be consistent with the axis 1 of the tunnel, and the X/Y/Z numerical value of the space position of the guide rail embedded part 3 is strictly determined, so that the space position of each guide rail embedded part 3 in the traveling process of the shield tunneling machine can be accurately positioned in the subsequent stage.
And in the second stage, binding the steel bar structure, wherein the outline of the steel bar structure is consistent with the design outline of the concrete guide platform 2, binding steel bars 22 according to the position of measurement paying-off, welding stirrups between the upper layer of steel bars 22 and the lower layer of steel bars 22, the distance between every two adjacent steel bars 22 is 200mm, the used steel bars 22 are phi 16 deformed steel bars, the steel bar binding rechecking specification requirements are met, and after the steel bar binding is finished, the combined supervision and management unit is organized for on-site constructors and quality inspectors to perform combined acceptance.
And in the third stage, installing the guide rail embedded parts 3, respectively welding a plurality of guide rail embedded parts 3 on two inclined planes of the ︺ -shaped groove of the steel bar structure, and positioning the welding positions of the guide rail embedded parts 3 through a total station.
And in the fourth stage, a template is installed, a release agent is uniformly coated before the template is installed, and the installation sequence of the template is as follows: one side formwork supporting, binding and fixing, installing a counter-pull water-stop bolt, the other side formwork supporting, correcting the position of a formwork, fastening the counter-pull water-stop bolt, supporting and fixing, measuring and rechecking; when the formwork is erected, the abutted seams of the panels need to be treated, and the abutted seams of the panels are stuck by double-sided adhesive tapes; care should also be taken at the corners of the wall (external corners) that the two panels overlap tightly; after the internal corner mold is erected, the transverse back edges (48 steel pipes) of the wall body mold plate extend to the internal corner mold, and split bolts are penetrated to fix the internal corner mold plate and the wall body mold plate correspondingly so as to ensure the squareness of the angle and no mold slip.
In the fifth stage, concrete 21 is poured, the thickness of a concrete protective layer of a steel bar structure is not less than 5cm, the pouring mode of the concrete 21 is layered pouring, the thickness of each layer of concrete is 30-40 cm, an inserted vibrator is adopted to carry out dense vibration, fast forward and slow out, the vibrator cannot be attached to a template, mold expansion is avoided, the thickness of the pouring layer is not more than 1.25 times of the length of an action part of the vibrator, the moving distance of the vibrator is not more than 1.5 times of the action radius of the vibrator, the depth of the vibrator inserted into the concrete in the lower layer is 5-10 cm, the duration of vibration in each position is 20-30 seconds, and no air bubbles appear when the concrete does not sink any more; and after the concrete 21 is poured, performing elevation retest to ensure that the elevation construction precision of the concrete guide platform 2 serving as a guide platform is within 0-15 mm.
In the sixth stage, guide rails 7 are installed, the guide rails 7 are short guide rails with the length of 3m, the number of the guide rails 7 is determined according to the length of the curved air shaft, the adjacent guide rails 7 are connected through fishplates, and the guide rails 7 are welded on the guide rail embedded parts 3 through small pressing plates 10, as shown in fig. 10; the height of the guide rail 7 at the receiving end is 50mm lower than that of the guide rail 7 at the starting end, the height of the guide rail 7 at the starting end is a designed elevation, and after the guide rail 7 is installed, a total station is used for rechecking the plane and vertical positions of the guide rail 7.
Step two: shield machine propulsion curve air shaft
In the first stage, when the shield machine is ready to enter a curve air shaft, the cutter is adjusted to avoid the contact of the cutter and the concrete guide table 2, each jack of the shield machine is adjusted, and the posture of the shield machine is adjusted to meet the stroke difference of the construction hinged oil cylinder of the curve segment with the radius of R =700 m; when the duct piece is installed, the pressure of the pushing jack is set to be the assembling pressure, the assembling pressure is 40bar, after each duct piece is installed, the duct piece connecting screw rod is firstly and preliminarily fastened manually, and then the bolt is fastened by a high-speed pneumatic trigger.
And in the second stage, the shield machine is arranged on the concrete guide table 2, the reinforcing condition of the guide rail 7 and the height difference between the bottom of the shield cutter head and the concrete guide table 2 need to be checked carefully before the shield machine is received, the shield machine is pushed onto the concrete guide table 2 after the situation is confirmed to be correct, the situation of the shield machine is closely concerned in the pushing process, and the pushing is stopped in time and is processed once the abnormal situation occurs.
Step three: curved air shaft of shield machine
In the first stage, a steel ring 9 is respectively arranged at the portal at two ends of the curved air shaft, and the starting negative ring pipe piece 4 is immersed into the starting end side wall by 400-800 mm; the structure of the steel ring 9 is as shown in fig. 8 and 9, the steel ring 9 is formed by coaxially butting four steel ring split bodies 91 through bolts and nuts, each steel ring split body 91 comprises a first connecting ring piece 911 and a second connecting ring piece 912 which are in a quarter-ring shape, the first connecting ring piece 911 and the second connecting ring piece 912 are connected through a plurality of rib plates 913 arranged between the first connecting ring piece and the second connecting ring piece, the two end portions of the first connecting ring piece 911 and the second connecting ring piece 912 are respectively provided with a butting plate 914, the butting plate 914 is provided with a plurality of through holes, and the butting plate 914 is used for connecting bolts of two adjacent steel ring split bodies 91.
In the second stage, the front body of the shield machine is separated from the portal steel ring 9 and enters a curved air shaft, a steel plate with the thickness of 30mm is welded at the bottom of the front body of the shield machine, a steel plate with the thickness of 35mm is welded at the bottom of the middle body of the shield machine, and a steel plate with the thickness of 40mm is welded at the bottom of the shield tail of the shield machine; the shield machine integrally passes through the curved air shaft by utilizing the reverse thrust provided by the shield tail assembled negative ring pipe piece 4, after the negative ring pipe piece 4 is separated from the shield tail, the waist part of the negative ring pipe piece 4 is fixed on the side wall or the upright post of the curved air shaft through H-shaped steel, as shown in figure 3, the H-shaped steel comprises an H-shaped steel cross brace 5 for providing transverse supporting force, an H-shaped steel vertical brace 6 for providing vertical supporting force and an H-shaped steel inclined brace 8 for providing inclined supporting force, so that the lateral displacement of the negative ring pipe piece is prevented; the assembling mode of the negative ring pipe piece 4 is as follows: splicing by adopting 16-point through seams and staggered seams; the negative ring duct pieces 4 adopt old straight ring duct pieces which are started and removed in an interval, in order to meet the requirement of a curve track, a rubber plate with the thickness of 2cm is bonded between every two adjacent negative ring duct pieces 4 at a turning part, after the negative ring duct pieces 4 are butted, the central line of the negative ring duct pieces is consistent with the axis 1 of the tunnel, as shown in figures 5-7, the quantity ratio of the negative ring duct pieces 4 for turning to the negative ring duct pieces 4 for straight lines is 1: 3.
due to the adoption of the construction method of the embodiment, the construction time of the shield tunneling machine for passing through the middle curve air shaft is only 10 days between the 5 King bushel station of the Jinan track traffic R3 line and the Pei home station, the construction period is shortened by 20 days compared with the conventional split air shaft passing construction method, 4 pairs of steel brackets are avoided to be purchased, the material cost is saved by 60 ten thousand, the old pipe piece is adopted as a negative ring pipe piece, the old pipe piece is transformed into a turning ring by sticking a rubber plate, the purchasing cost of the turning ring pipe piece is reduced by 20 ten thousand, the project management cost is reduced by 48 ten thousand, the total saved cost is about 130 ten thousand, the time and the labor are saved, and the efficiency is high.
In the description of the present invention, words such as "inner", "outer", "upper", "lower", "front", "rear", etc., indicating orientations or positional relationships, are used for convenience in describing the present invention, and do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The above description is only one embodiment of the present invention, and the scope of the present invention is not limited to the above embodiments, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the spirit of the present invention.
Claims (10)
1. A construction method for an air-thrust shield tunneling machine to integrally pass through a curved air shaft is characterized by comprising the following steps: the section of the tunnel axis where the air shaft is located is a curve, and the method sequentially comprises the following steps:
the method comprises the following steps: construction of concrete guide platform
Completing the construction of a concrete guide platform before the shield machine reaches a curved air shaft, wherein the concrete guide platform comprises ︺ -shaped grooves, and the symmetrical center lines of the ︺ -shaped grooves are consistent with the axis of the tunnel;
the first stage, measuring and setting out, accurately positioning through networking actual measurement, and strictly controlling the axis of the concrete guide platform to be consistent with the axis of the tunnel;
binding a steel bar structure, binding steel bars according to the position of measurement setting, and welding stirrups between the upper layer of steel bars and the lower layer of steel bars, wherein the outline of the steel bar structure is consistent with the design outline of the concrete guide platform;
in the third stage, installing guide rail embedded parts, respectively welding a plurality of guide rail embedded parts on two inclined planes of an ︺ -shaped groove of the steel bar structure, and positioning the welding positions of the guide rail embedded parts through a total station;
the fourth stage, install the template;
fifthly, pouring concrete, wherein the thickness of a concrete protective layer of the steel bar structure is not less than 5 cm;
in the sixth stage, guide rails are installed and welded on the guide rail embedded parts through small press plates, the guide rails are connected through a fishplate, the height of the guide rail at the receiving end is lower than that of the guide rail at the initiating end, and the height of the guide rail at the initiating end is a designed elevation;
step two: shield machine propulsion curve air shaft
In the first stage, when the shield machine is ready to enter a curved air shaft, adjusting a cutter to avoid the cutter from contacting a concrete guide table, adjusting each jack of the shield machine, and adjusting the posture of the shield machine; when the duct pieces are installed, the pressure of the pushing jack is set as the assembling pressure, after each duct piece is installed, the duct piece connecting screw rod is firstly and preliminarily fastened by manpower, and then a high-speed pneumatic trigger is used for fastening the bolt;
in the second stage, a shield is arranged on a concrete guide platform;
step three: curved air shaft of shield machine
In the first stage, two steel rings are respectively arranged at the holes at the two ends of the curved air shaft, and the starting negative ring pipe piece is immersed into the starting end side wall by 400-800 mm;
in the second stage, the front body of the shield machine is separated from a portal steel ring and enters a curved air shaft, a steel plate with the thickness of 30mm is welded at the bottom of the front body of the shield machine, a steel plate with the thickness of 35mm is welded at the bottom of the middle body of the shield machine, and a steel plate with the thickness of 40mm is welded at the bottom of the shield tail of the shield machine; the reverse thrust provided by assembling the negative ring duct pieces by the shield tail enables the whole shield machine to pass through the curve air shaft, and after the negative ring duct pieces are separated from the shield tail, the waist of the negative ring duct pieces is fixed on the side wall or the stand column of the curve air shaft through the H-shaped steel, so that the lateral displacement of the negative ring duct pieces is prevented.
2. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: the curve radius of the tunnel axis line segment where the air shaft is located is 700 m.
3. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: in the second stage of the first step, the steel bars are phi 16 deformed steel bars, and the distance between every two adjacent steel bars is 200 mm.
4. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: in the fourth stage of the first step, the installation sequence of the templates is as follows in sequence: and (3) supporting a formwork at one side, binding and fixing, installing a counter-pull water-stop bolt, supporting the formwork at the other side, correcting the position of the formwork, fastening the counter-pull water-stop bolt, and supporting and fixing.
5. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: and in the fourth stage of the first step, uniformly brushing a release agent before the template is installed.
6. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: in the fifth stage of the first step, the concrete pouring mode is layered pouring, an inserted vibrator is adopted to carry out dense vibration, fast speed and slow speed are carried out, the vibrator cannot be attached to a template, mold expansion is avoided, the thickness of a pouring layer is not more than 1.25 times of the length of an action part of the vibrator, the moving distance of the vibrator is not more than 1.5 times of the action radius of the vibrator, the depth of the vibrator inserted into the concrete on the lower layer is 5-10 cm, the vibration duration time of each position is 20-30 seconds, and no bubbles are generated until the concrete does not sink.
7. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 6, characterized by comprising the following steps: the thickness of each layer of concrete poured in layers is 30-40 cm.
8. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: in the sixth stage of the first step, the length of the guide rail is 3 m.
9. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: in the sixth stage of the first step, the height of the guide rail of the receiving end is 50mm lower than that of the guide rail of the initiating end.
10. The construction method of the air-propelling shield tunneling machine integrally passing through the curved air shaft according to claim 1, characterized by comprising the following steps of: in the second stage of the third step, the negative ring pipe pieces adopt old straight-line ring pipe pieces which are started to be detached from intervals, and in order to meet the requirement of curve tracks, rubber plates are bonded between adjacent negative ring pipe pieces at turning positions, so that the center lines of the negative ring pipe pieces are consistent with the axis of the tunnel after the negative ring pipe pieces are butted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910949266.3A CN110617073A (en) | 2019-10-08 | 2019-10-08 | Construction method for air-propelled shield tunneling machine to integrally pass through curved air shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910949266.3A CN110617073A (en) | 2019-10-08 | 2019-10-08 | Construction method for air-propelled shield tunneling machine to integrally pass through curved air shaft |
Publications (1)
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Cited By (3)
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| CN111550252A (en) * | 2020-05-26 | 2020-08-18 | 中建八局轨道交通建设有限公司 | Station bottom plate for shield machine receiving and construction method thereof |
| CN113309541A (en) * | 2021-06-10 | 2021-08-27 | 中铁十二局集团有限公司 | Lining construction method for shield small-radius tunnel |
| CN113309542A (en) * | 2021-06-10 | 2021-08-27 | 中铁十二局集团有限公司 | Shield small-radius tunnel needle beam type rotary die full-circle lining trolley and rotary die method thereof |
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|---|---|---|---|---|
| CN111550252A (en) * | 2020-05-26 | 2020-08-18 | 中建八局轨道交通建设有限公司 | Station bottom plate for shield machine receiving and construction method thereof |
| CN113309541A (en) * | 2021-06-10 | 2021-08-27 | 中铁十二局集团有限公司 | Lining construction method for shield small-radius tunnel |
| CN113309542A (en) * | 2021-06-10 | 2021-08-27 | 中铁十二局集团有限公司 | Shield small-radius tunnel needle beam type rotary die full-circle lining trolley and rotary die method thereof |
| CN113309541B (en) * | 2021-06-10 | 2022-04-19 | 中铁十二局集团有限公司 | Lining construction method for shield small-radius tunnel |
| CN113309542B (en) * | 2021-06-10 | 2022-04-19 | 中铁十二局集团有限公司 | Shield small-radius tunnel needle beam type rotary die full-circle lining trolley and rotary die method thereof |
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