CN113236290A - Construction process of steel frame mold for tunnel portal arch protection section - Google Patents
Construction process of steel frame mold for tunnel portal arch protection section Download PDFInfo
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- CN113236290A CN113236290A CN202110677391.0A CN202110677391A CN113236290A CN 113236290 A CN113236290 A CN 113236290A CN 202110677391 A CN202110677391 A CN 202110677391A CN 113236290 A CN113236290 A CN 113236290A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 162
- 239000010959 steel Substances 0.000 title claims abstract description 162
- 238000010276 construction Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 238000009415 formwork Methods 0.000 claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 8
- 230000002787 reinforcement Effects 0.000 claims abstract description 7
- 239000004927 clay Substances 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 30
- 239000002023 wood Substances 0.000 claims description 11
- 230000001012 protector Effects 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 5
- 239000004746 geotextile Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 238000009432 framing Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000004575 stone Substances 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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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
- E21D11/006—Lining anchored in the rock
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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
- E21D11/04—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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/30—Bases for lower arch members
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a tunnel portal arch protection section steel frame formwork construction process, which relates to the technical field of tunnel construction and comprises the following steps: the method comprises the following steps of arch protection foundation construction, primary support steel arch erection, net piece hanging and concrete spraying, arch protection reinforcement binding, outer template installation, arch protection pouring, outer template dismantling, maintenance, earth and stone tamping, clay filling and water resisting layer filling and soil layer planting. A steel arch frame is erected on an arch protection foundation, an inner net and an outer net are hung inside and outside the steel arch frame, concrete is sprayed to form an arch protection inner mold, the arch protection foundation is fixedly connected with a soil body at an arch foot through a foot locking steel pipe, and the stability of the structure of the arch protection steel frame is ensured. The invention can connect the arch protection internal model and the arch protection into a whole, and the integral stability of the arch protection is better. By adopting the method, the construction process can be simplified, the upper half part of the retaining arch does not need to be installed during later-stage hole entering construction, two steps at the lower part can be directly constructed, and only the full-space support below the retaining arch internal mold needs to be dismantled according to the construction progress, so that the construction progress is accelerated.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a steel frame formwork construction process for an arch protection section of a tunnel portal.
Background
The conventional construction process for shallow-buried biased tunneling of the tunnel generally adopts a construction method of back-pressure backfilling soil or reducing excavation of an open face, such as a four-step CD method, a crossed middle partition wall method and the like, and the conventional construction process has the uncontrollable defects of low construction speed, complex process, high construction risk and the like.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a steel frame formwork construction process for an arch protection section of a tunnel portal, aiming at the defects of the prior art, the stability of the whole arch protection can be better by connecting a steel arch frame and an arch protection into a whole, the subsequent construction process can be simplified, and the workload is reduced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a construction process of a steel frame mold of an arch protection section of a tunnel portal comprises the following steps:
s1, constructing an arch protection foundation: excavating arch springing, and drilling holes at arch springing parts at two sides of the protective arch and installing locking steel pipes;
s2, erecting a primary support steel arch frame: binding arch foot reinforcing steel bars of the arch protection foundation, and pouring concrete into the arch protection foundation; fixedly connecting the end parts of the two sides of the primary support steel arch frame with arch springing steel bars;
s3, mounting meshes on the primary steel arch, hanging the meshes inside and outside the primary steel arch, and spraying concrete into the primary steel arch to form an arch protection internal mold;
s4, binding arch protection reinforcing steel bars: binding arch frame positioning steel bars on the arch protection internal mold, and connecting arch springing positions of the arch frame positioning steel bars with arch springing steel bars to form arch protection arch wall steel bars;
s5, protecting the arch and installing the outer template: assembling a wood plate outside the arch protection arch wall reinforcing steel bars to form an outer template;
s6, arch protection pouring:
s7, removing the outer template;
s8, maintaining;
s9, tamping the earthwork;
s10, filling clay water-resisting layer and planting soil layer.
Preferably, in step S1, the lock pin steel tubes are arranged at intervals in the length direction of the arch guard, each group of lock pin steel tubes includes two steel tubes which are at a certain included angle and are drilled obliquely below the outer side of the arch pin, and the steel tubes are filled with cement slurry.
Preferably, the diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are 15 degrees and 30 degrees respectively, and the longitudinal spacing distance of the steel perforated pipes along the retaining arch is 0.5 m; the length of the steel perforated pipe is 6.0m, the wall thickness is 6mm, and the upper end of the steel perforated pipe extends to the inside of the arch protection foundation by 25cm and is used for being connected with the arch protection into a whole.
Preferably, in step S2, a vertical full framing is erected inside the arch protector for supporting the primary steel arch.
Preferably, in step S3, a formwork is installed on a side surface of the preliminary supporting steel arch, and concrete is sprayed into the mesh sheet to be fixedly connected with the preliminary supporting steel arch into a whole, thereby forming the arch protection inner mold.
Preferably, the deviation of the inner model contour line of the arch protector is controlled within 2 cm.
Preferably, the arch frame positioning steel bars and the arch springing steel bars are bound by arch protection main bars, distribution bars and stirrups; the outer part of the arch frame positioning steel bar is provided with an arch frame circumferential positioning steel bar; and exposed connecting ribs are arranged on the arch springing reinforcing steel bars and the arch frame positioning reinforcing steel bars in the arch protection foundation.
Preferably, the main reinforcement of the arch protection adopts the steel bar interval of HRB400 phi 22mm and the layer interval of 20cm, the distribution reinforcement adopts the steel bar interval of HRB400 phi 16mm and the layer interval of 25cm, and the stirrup adopts the steel bar of HRB 300 phi 10 mm.
Preferably, the outer formworks are installed symmetrically in the circumferential direction on two sides of the self-protection arch; the outer part of the outer template is provided with two reinforcing steel bar hoops which can be connected with embedded parts in the arch protection foundation and arch frame circumferential positioning reinforcing steel bars and are used for fixing the outer template; and a plurality of horizontal steel pipes are arranged at intervals at the arch springing position of the outer template and are used for supporting the root of the outer template.
Preferably, the thickness of a single wood board of the outer template is 5cm, the width of the single wood board is 30cm, and geotextile for blocking concrete leakage is arranged between two adjacent wood boards; the number of the horizontal steel pipes at the root of the outer template is three, the height of the uppermost horizontal steel pipe is 3.0m, and the two lower horizontal steel pipes are sequentially spaced by 0.6-1.0m downwards.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the method has the advantages that the primary steel arch is erected on the basis of the arch protection, the concrete is sprayed on the inner net and the outer net of the primary steel arch to form the arch protection inner mold, and the arch protection wall reinforcing steel bars and the outer template are sequentially bound and paved outside the arch protection inner mold; in addition, the arch protection foundation is fixedly connected with the soil body at the arch springing through the locking steel pipe, and the stability of the arch protection steel framework structure is ensured. The invention can connect the inner arch protection mould and the arch protection into a whole, so that the whole stability is better; meanwhile, by adopting the technical scheme of the invention, the construction process can be simplified, the upper half part of the retaining arch does not need to be installed during later-stage hole entering construction, two steps at the lower part can be directly constructed, and only the full-space support below the retaining arch internal mold needs to be dismantled according to the construction progress, so that the construction progress is accelerated.
Drawings
Fig. 1 is a schematic structural diagram of a steel frame formwork construction process for an arch protection segment of a tunnel portal according to an embodiment of the present invention;
FIG. 2 is a construction state diagram of an arch protection steel framework structure in the embodiment of the invention;
FIG. 3 is a state diagram after completion of an arch protector in the embodiment of the present invention;
FIG. 4 is a cross-sectional view I-I of the arch positioning bar of FIG. 1;
FIG. 5 is a sectional view II-II of the arch reinforcement of FIG. 1;
FIG. 6 is an A-directional view of the outer template of FIG. 1;
FIG. 7 is a partial longitudinal cross-sectional view of the inner mold of the steel frame in the embodiment of the present invention;
in the figure: 00-arch protection; 1-arch protection foundation; 2-arch protection internal mold, 21-primary support steel arch frame, 22-mesh sheet; 3-arch protection arch wall reinforcing steel bars, 301-arch frame positioning reinforcing steel bars, 302-arch springing reinforcing steel bars, 30-arch protection main reinforcing steel bars, 31-distribution reinforcing steel bars, 32-stirrups and 33-connection reinforcing steel bars; 4-external template; 5-locking the steel pipe; 6-a steel bar hoop; 7-horizontal steel pipes; 8-full hall bracket.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a certain high-speed railway double-track tunnel, the topography at the exit is relatively slow, and for shallow buried bias voltage, and the up slope of the hidden tunnel entry position is high and steep again, geological conditions: early stage granite of Yanshan mountain. The total weathering layer is about 10.0-30.0 m thick, is hard and plastic, belongs to grade III hard soil, and has multiple layers of strong weathering rock layers and weak weathering rock layers with the thickness of 0.5-2.0 m due to differential weathering; the highly weathered layer is in a shape of a broken block and a pebble and belongs to IV-grade soft rock; the weakly weathered layer belongs to grade V hard stone. Therefore, the intersection section of the open cut tunnel and the underground tunnel at the outlet is designed to adopt open cut tunnel underground excavation and arrangement of a reinforced concrete arch protector 15m, the thickness of the arch protector is 60cm, and the angle is 180 degrees (semicircular). The arch protection is constructed by adopting the steel framework structure provided by the invention.
As shown in fig. 1-3, the invention provides a steel frame formwork construction process for an arch protection section of a tunnel portal, which comprises the following steps:
s1, constructing an arch protection foundation 1: excavating arch springing, drilling holes at arch springing positions on two sides of the protective arch 00 and installing locking steel pipes 5; the lock leg steel pipes 5 are arranged in a plurality of groups at intervals along the length direction of the arch protector, each group of lock leg steel pipes comprises two steel tubes which are arranged at a certain included angle and are drilled obliquely below the outer side of the arch leg, and cement slurry is poured into the steel tubes. The diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are 15 degrees and 30 degrees respectively, and the longitudinal spacing distance of the steel perforated pipes along the retaining arch is 0.5 m; the length of the steel perforated pipe is 6.0m, the wall thickness is 6mm, and the upper end of the steel perforated pipe extends to the inside of the arch protection foundation by 25cm and is used for being connected with the arch protection into a whole. The concrete construction process is as follows:
after arch springing excavation forming of the retaining arch, a down-the-hole drill is used for longitudinally arranging 0.5 m/position according to the sequence from inside to outside, 2 phi 89 locking steel pipes are arranged in each group according to the angle of 15 degrees and 30 degrees, the upper end of each steel flower pipe extends into the retaining arch foundation, and the steel flower pipes can be guaranteed to be connected with the forming retaining arch into a whole. The water-cement ratio of cement slurry poured into the steel flower tube is as follows: 1:1 (weight ratio), grouting pressure: 0.5 to 2.2 MPa.
S2, erecting a primary support steel arch 21: binding arch foot reinforcing steel bars 302 of the arch protection foundation 1, and pouring concrete into the arch protection foundation 1; fixedly connecting the end parts at two sides of the primary support steel arch 21 with the arch springing steel bars 302; in order to support the primary steel arch 21 and facilitate construction, a vertical full-space bracket 8 is erected in the arch protection for supporting the primary steel arch.
During construction, manual trimming is carried out on the arch protection internal mold, and deviation of the contour line of the steel frame internal mold is controlled within 2 cm. The tunnel arch protection construction lofting mainly comprises lofting of a plane position and a contour line, wherein the plane position lofting is used for accurately positioning an arch protection center line and an arch foot side line by using a total station when an arch is protected, the contour line lofting is used for calculating an inner contour line of the arch protection from an arch crown to an arch foot by using the total station according to the circumferential direction of 0.5m and the longitudinal direction of 1m, and the contour line deviation of an inner mold of the arch protection is strictly controlled within 2cm along with excavation and rechecking. According to the contour line of the arch protection structure determined by measuring and paying off, earth excavation is carried out on arch protection arch springing by mainly depending on an excavator, manual bottom cleaning is adopted and foundation tamping is carried out when the arch protection springing is excavated to be 20cm higher than the designed standard height, and the forming surface of the arch protection is trimmed and formed.
S3, mounting the net pieces 22 on the primary steel arch 21, hanging the net pieces 22 inside and outside the primary steel arch 21, and spraying concrete into the primary steel arch 21 to form the arch protection inner die 2. The primary steel arch 21 is made of section steel, and a vertical full support 8 is erected below the primary steel arch 21 and used for supporting the primary steel arch 21. Constructors stand on the vertical full framing support to operate, the primary steel arch support is connected into a whole by welding steel bars, and meshes are hung inside and outside the primary steel arch support and concrete is sprayed, so that the arch protection internal mold is formed.
S4, binding arch protection reinforcing steel bars: and binding arch frame positioning steel bars 301 on the arch protection internal mold 2, and connecting arch springing positions of the arch frame positioning steel bars 301 with arch springing steel bars 302 to form arch protection arch wall steel bars 3.
The arch centering steel bars 301 and the arch springing steel bars 302 are bound by arch protection main bars 30, distribution bars 31 and stirrups 32; the outer part of the arch frame positioning steel bar is provided with an arch frame circumferential positioning steel bar; the arch springing reinforcing steel bars 302 and the arch centering reinforcing steel bars 301 in the arch protection foundation 1 are provided with exposed connecting ribs 33. The arch protection main ribs 30 are made of HRB400 phi 22mm steel bars, the distance between the steel bars is 20cm, the layer distance is 50cm, and the distance between the inner layer arch protection main rib 30 and the outer layer arch protection main rib 30 is 600 mm; the distribution ribs 31 adopt HRB400 phi 16mm steel bars with the spacing of 25cm, and the width of the distribution ribs 31 is 458 mm; the stirrups 32 adopt HRB 300 phi 10mm steel bars. The arch springing reinforcing steel bars in the arch protection foundation and the exposed connecting ribs of the arch frame positioning reinforcing steel bars of the arch wall are not less than 35d, and the connecting mode adopts welding. The two ends of the arch frame positioning steel bar are fixedly connected with the reserved connecting ribs of the arch springing, and the arch frame annular positioning steel bar (not shown in the figure) is bound outside the arch frame positioning steel bar to form the arch wall protecting steel bar 3.
S5, protecting the arch and installing the outer template: assembling a wood plate outside the arch protection arch wall reinforcing steel bars 3 to form an outer template 4;
the outer template 4 is formed by assembling a plurality of wood boards, and the outer template 4 is installed symmetrically on the two sides of the self-protection arch in the circumferential direction; the outer part of the outer template 4 is provided with two reinforcing steel bar hoops 6 which can be connected with embedded parts and arch frame circumferential positioning reinforcing steel bars in the arch protection foundation 1 and are used for fixing the outer template 4; the root of the steel bar hoop 6 is welded and connected with an embedded part in the arch protection foundation 1, the embedded part is a steel bar with the embedded length of 1.0mHRB phi 22, and is embedded into the steel bar hoop by 80cm and exposed out by 20 cm; and meanwhile, a plurality of horizontal steel pipes 7 are arranged at intervals in the range that the root of the outer template 4 at the arch springing position is 3.0m high and are used for supporting the root of the outer template 4 and reinforcing the outer template. During specific construction, the thickness of a single wood board of the outer template 4 is 5cm, and the width of the single wood board is 30 cm; and geotextile for blocking concrete leakage is arranged between two adjacent wood boards. In the concrete pouring process, due to the fact that small gaps are formed between the wood boards of the outer formwork, slurry is prone to leaking, when concrete is poured, the slurry is prevented from leaking due to the fact that materials such as geotextile are used for leaking stoppage, and the concrete quality is prevented from being affected due to slurry leaking. The number of the horizontal steel pipes 7 at the root of the outer template 4 is three, the height of the uppermost horizontal steel pipe 7 is 3.0m, and the two lower horizontal steel pipes 7 are sequentially spaced by 0.6-1.0m downwards.
S6, arch protection pouring:
s7, removing the outer template;
s8, maintaining;
s9, tamping the earthwork;
s10, filling clay water-resisting layer and planting soil layer.
In conclusion, the concrete is sprayed on the inner hanging net and the outer hanging net of the primary steel arch as the arch protection inner mold, the primary steel arch and the arch protection can be effectively connected into a whole, the integral stability of the primary steel arch is better, the installation of the upper half of the primary steel arch during later-stage hole entering construction is reduced, two steps on the lower part can be directly constructed, the full support in the primary steel arch is only required to be dismantled according to the construction progress, and a part of time for later-stage primary construction is saved. The method is particularly suitable for construction of the retaining arch with less earthwork and large height difference, the whole construction process is safe and good in stability, the quality is guaranteed, the reinforcement time of the supporting form inside the retaining arch is reduced, the time for mounting the primary support steel arch of the upper-step excavating machine during later-stage hole entering construction is reduced, the construction workload is greatly reduced, the construction progress is accelerated, and the method is convenient to popularize and apply.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A construction process of a steel frame mold of an arch protection section of a tunnel portal is characterized by comprising the following steps:
s1, constructing an arch protection foundation: excavating arch springing, and drilling holes at arch springing parts at two sides of the protective arch and installing locking steel pipes;
s2, erecting a primary support steel arch frame: binding arch foot reinforcing steel bars of the arch protection foundation, and pouring concrete into the arch protection foundation; fixedly connecting the end parts of the two sides of the primary support steel arch frame with arch springing steel bars;
s3, mounting meshes on the primary steel arch, hanging the meshes inside and outside the primary steel arch, and spraying concrete into the primary steel arch to form an arch protection internal mold;
s4, binding arch protection reinforcing steel bars: binding arch frame positioning steel bars on the arch protection internal mold, and connecting arch springing positions of the arch frame positioning steel bars with arch springing steel bars to form arch protection arch wall steel bars;
s5, protecting the arch and installing the outer template: assembling a wood plate outside the arch protection arch wall reinforcing steel bars to form an outer template;
s6, arch protection pouring:
s7, removing the outer template;
s8, maintaining;
s9, tamping the earthwork;
s10, filling clay water-resisting layer and planting soil layer.
2. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 1, characterized in that: in step S1, the lock leg steel tubes are arranged at intervals along the length direction of the arch guard, each group of lock leg steel tubes includes two steel tubes which are arranged at a certain included angle and are drilled obliquely below the outer side of the arch leg, and the steel tubes are filled with cement slurry.
3. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 2, characterized in that: the diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are 15 degrees and 30 degrees respectively, and the longitudinal spacing distance of the steel perforated pipes along the retaining arch is 0.5 m; the length of the steel perforated pipe is 6.0m, the wall thickness is 6mm, and the upper end of the steel perforated pipe extends to the inside of the arch protection foundation by 25cm and is used for being connected with the arch protection into a whole.
4. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 1, characterized in that: in step S2, a vertical full framing support is erected inside the arch protector for supporting the primary steel arch.
5. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 1, characterized in that: in step S3, a formwork is installed on the side of the primary steel arch, and concrete is sprayed into the mesh to be fixedly connected with the primary steel arch into a whole, thereby forming the arch protection inner mold.
6. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 1, characterized in that: and the deviation of the contour line of the inner model of the arch protection is controlled within 2 cm.
7. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 1, characterized in that: the arch frame positioning steel bars and the arch springing steel bars are bound by arch protection main bars, distribution bars and stirrups; the outer part of the arch frame positioning steel bar is provided with an arch frame circumferential positioning steel bar; and exposed connecting ribs are arranged on the arch springing reinforcing steel bars and the arch frame positioning reinforcing steel bars in the arch protection foundation.
8. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 7, characterized in that: the main reinforcement of the arch protection adopts the steel bar interval of HRB400 phi 22mm to be 20cm and the layer distance to be 50cm, the distribution reinforcement adopts the steel bar interval of HRB400 phi 16mm to be 25cm, and the stirrup adopts the steel bar of HRB 300 phi 10 mm.
9. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 1, characterized in that: the two sides of the self-protection arch of the outer template are annularly and symmetrically arranged; the outer part of the outer template is provided with two reinforcing steel bar hoops which can be connected with embedded parts in the arch protection foundation and arch frame circumferential positioning reinforcing steel bars and are used for fixing the outer template; and a plurality of horizontal steel pipes are arranged at intervals at the arch springing position of the outer template and are used for supporting the root of the outer template.
10. The steel frame mold construction process for the tunnel portal arch protection segment according to claim 9, characterized in that: the thickness of a single board of the outer template is 5cm, the width of the single board is 30cm, and geotextile for blocking concrete leakage is arranged between two adjacent boards; the number of the horizontal steel pipes at the root of the outer template is three, the height of the uppermost horizontal steel pipe is 3.0m, and the two lower horizontal steel pipes are sequentially spaced by 0.6-1.0m downwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110677391.0A CN113236290A (en) | 2021-06-18 | 2021-06-18 | Construction process of steel frame mold for tunnel portal arch protection section |
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| CN202110677391.0A CN113236290A (en) | 2021-06-18 | 2021-06-18 | Construction process of steel frame mold for tunnel portal arch protection section |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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