CN214997675U - Earth mould structure for construction of tunnel portal arch protection section - Google Patents
Earth mould structure for construction of tunnel portal arch protection section Download PDFInfo
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- CN214997675U CN214997675U CN202121358838.XU CN202121358838U CN214997675U CN 214997675 U CN214997675 U CN 214997675U CN 202121358838 U CN202121358838 U CN 202121358838U CN 214997675 U CN214997675 U CN 214997675U
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Abstract
The utility model discloses a soil matrix structure for tunnel portal arch protection section construction, which relates to the technical field of tunnel construction, and comprises a soil matrix inner mold backfilled in an arch protection gap, wherein arch protection arch wall reinforcing steel bars are sequentially bound and an outer template is laid outside the soil matrix inner mold; an arch springing locking component connected with the soil body is arranged at the arch springing position of the arch protection foundation, and the upper end of the arch springing locking component extends into the arch protection foundation. The soil tire internal mold is formed by backfilling the gap of the arch protection section, so that the construction is simple and convenient, and the operation is easy; and a locking assembly is drilled and fixedly connected with soil at the arch springing to ensure that the locking assembly is connected with the formed arch protector into a whole. The utility model discloses at the outside direct ligature of soil child centre form and protect hunch arch wall reinforcing bar and reduce the steelframe installation time, avoid follow-up construction to appear the steelframe transfinite or the inside and outside quality of observation unqualified appearance in hole, can simplify construction process, practice thrift the time of entering the hole, shorten construction period, practiced thrift construction cost.
Description
Technical Field
The utility model relates to a tunnel construction technical field especially relates to a tunnel portal protects and encircles section construction with native child mould structure.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that to above-mentioned prior art not enough, provide a tunnel portal protects and encircles section construction and use soil matrix structure, through protecting the arch section breach backfill with the pipe roof construction excavation as the soil matrix centre form, can simplify construction process for the construction progress reduces construction cost.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is:
a soil matrix structure for tunnel portal arch protection section construction comprises a soil matrix inner mold backfilled in an arch protection gap, wherein arch protection arch wall reinforcing steel bars and an outer template are sequentially bound and laid outside the soil matrix inner mold, the arch protection arch wall reinforcing steel bars comprise arch frame positioning reinforcing steel bars and arch foot reinforcing steel bars of an arch protection foundation, and the arch frame positioning reinforcing steel bars are arranged on the surface of the soil matrix inner mold; an arch foot locking assembly used for being connected with a soil body is arranged at an arch foot position of the arch protection foundation, and the upper end of the arch foot locking assembly extends into the arch protection foundation.
Preferably, the deviation of the contour line in the soil tyre is controlled within 2 cm.
Preferably, the soil inner mold is formed by backfilling undisturbed soil or improved soil; and an artificial leather isolating membrane is paved outside the soil inner die.
Preferably, the arch foot locking assembly comprises two groups of foot locking steel pipes, each group of foot locking steel pipes is two steel flower pipes capable of being filled with cement paste, every two steel flower pipes are arranged at arch feet on two sides of the arch guard in an inverted V-shaped mode, and the two steel flower pipes are arranged in an inverted V-shaped mode and are drilled towards the oblique lower side of the outer side of each arch foot; the upper end of the steel perforated pipe is embedded in the arch protection foundation.
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, the steel perforated pipes are arranged at intervals along the longitudinal direction of the retaining arch, and the distance between the adjacent steel perforated pipes 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, 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; the arch springing reinforcing steel bars and the arch centering positioning reinforcing steel bars are provided with exposed connecting ribs.
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 template is formed by assembling a plurality of wood boards, and the outer template is annularly and symmetrically arranged on two sides of the self-protection arch; and a steel bar hoop which can be connected with an embedded part in the arch protection foundation and the hoop positioning steel bars of the arch frame is arranged outside the outer template and used for fixing the outer template.
Preferably, a plurality of horizontal steel pipes are installed at intervals at the arch springing positions of the outer formworks and used for supporting the roots of the outer formworks.
Preferably, the thickness of a single wood board of the outer template is 5cm, the width of the single wood board is 20cm, and the length of the single wood board is 4-6.0 m; and a geotextile for blocking concrete leakage is arranged between two adjacent wood boards; the horizontal steel pipes are three steel pipes with the diameter of phi 89mm, 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 utility model forms the soil tyre inner mold by backfilling the gap of the arch protection section, and constructs the arch protection arch wall reinforcing steel bars and lays the outer template outside the soil tyre inner mold in sequence; meanwhile, the arch protection foundation is fixedly connected with the soil body at the arch springing position through a drilling locking assembly, so that the arch protection foundation is ensured to be connected with the formed arch protection into a whole. The utility model has the characteristics of the construction is simple and convenient, easily operation, through the outside direct ligature at the soil matrix centre form protect the arch wall reinforcing bar and reduce the steelframe installation time, avoid follow-up construction to appear the steelframe transfinite or the inside and outside quality of observation in hole unqualified appearance, can simplify construction process, practice thrift the time of advancing the hole, shorten construction period, practiced thrift construction cost.
Drawings
Fig. 1 is a schematic structural diagram of a soil matrix structure for tunnel portal arch protection segment construction provided by an embodiment of the present invention;
FIG. 2 is a state diagram of the embodiment of the present invention after the completion of the arch protection;
FIG. 3 is an A-direction view of the outer mold plate of FIG. 1;
FIG. 4 is a cross-sectional view I-I of the arch positioning bar of FIG. 2;
FIG. 5 is a sectional view II-II of the arch reinforcement of FIG. 2;
in the figure: 00-arch protection; 1-arch protection foundation; 2-an internal mold of the soil tire; 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 steel pipe, 50-steel flower pipe; 6-a steel bar hoop; 7-horizontal steel pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, 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). This fender arch adoption the utility model provides a soil matrix structure protects and encircles the construction, only with the construction that the tunnel entry section protected to encircle has just been accomplished to a week time, whole work progress safety, quick, high efficiency, the quality is secure, and has improved the efficiency of construction, has reduced construction cost.
As shown in fig. 1 and 2, the utility model provides a tunnel portal protects a native matrix structure for arch segment construction, including backfilling in protecting the native matrix centre form 2 in the arch 00 breach, the outside of native matrix centre form 2 ligature in proper order protects a hunch wall reinforcing bar 3 and lays exterior sheathing 4, it includes bow member positioning reinforcement 301 and protects hunch foot reinforcing bar 302 of hunch basis 1 to protect hunch wall reinforcing bar 3, bow member positioning reinforcement 301 sets up in the surface of native matrix centre form 2; an arch foot locking assembly used for being connected with a soil body is arranged at an arch foot position of the arch protection foundation 1, and the upper end of the arch foot locking assembly extends into the arch protection foundation 1. According to the scheme, the earth tire mold structure is used for construction, so that the mounting time of the supporting steel frame can be shortened, the follow-up construction is avoided, the steel frame is out of limit or the appearance quality inside and outside the tunnel is unqualified; meanwhile, the soil matrix structure is convenient to construct and easy to operate, and the arch springing locking assembly and the arch protector can be connected into a whole, so that the integral stability of the arch springing locking assembly is better; the construction process is simplified, the hole entering time is saved, the construction period is shortened, and the construction cost is reduced.
During construction, the soil inner mold is manually trimmed, and the deviation of the contour line of the soil inner mold 2 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 the arch top to the arch foot by using the total station according to the circumferential direction of 0.5m and the longitudinal direction of 1m, and the deviation of the inner contour line is strictly controlled within 2cm along with excavation and rechecking. According to the contour line of the retaining arch structure determined by measuring and setting-out, earth excavation is carried out mainly by means of an excavator, manual excavation is changed into manual excavation when the distance from the top surface of the inner arc of the retaining arch is 10-20 cm, foundation tamping is carried out, and the forming surface of the inner mold of the retaining arch earth tire is trimmed and formed.
In a specific embodiment of the present invention, as shown in fig. 1, the soil inner mold 2 is formed by backfilling undisturbed soil or improved soil; an artificial leather isolating membrane is laid outside the soil inner mould 2, so that the slurry leakage phenomenon of the arch protection pouring concrete is avoided. And (3) trimming the soil body into a soil tire with the shape and the size of the arch protection internal mold by using the undisturbed soil or the backfilled improved soil, so as to form the soil tire internal mold. In view of the fact that a guide wall and a large pipe shed need to be constructed before tunnel arch protection construction, and the arch protection surface soil tire is damaged, 5% cement soil is adopted for improvement on site. The concrete method is that after the construction of the large pipe shed is finished, 5% of cement soil is adopted to backfill, roll and compact the gap of the arch protection section excavated during the construction of the pipe shed, an arch protection soil inner mold is refitted by manually matching with machinery, and then reinforced concrete construction of the arch protection 00 is carried out. Wherein, 5% of cement in the cement-modified soil: the mass ratio of the soil is 5:100, the cement and the soil are mixed well in advance before construction, and then backfilling is carried out.
In a specific embodiment of the present invention, as shown in fig. 1 and 2, the arch foot locking assembly includes two groups of locking steel pipes 5, each group of locking steel pipes 5 is two steel flower pipes 50 capable of being filled with cement paste, two steel flower pipes 50 are drilled at the arch feet at two sides of the arch protector 00, and the two steel flower pipes 50 are arranged in an inverted V shape and are drilled towards the oblique lower side of the outer side of the arch feet; the upper end of the steel perforated pipe 50 is embedded in the arch protection foundation 1. During specific design, the diameters of the two steel perforated pipes are phi 89mm, the inclination angles of the two steel perforated pipes are respectively 15 degrees and 30 degrees, the steel perforated pipes are longitudinally arranged along the retaining arch at intervals, and the distance between every two adjacent steel perforated pipes 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. 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.
In a specific embodiment of the present invention, as shown in fig. 1, 4 and 5, the arch positioning steel bars 301 and the arch springing steel bars 302 are bound by the arch protection main bars 30, the distribution bars 31 and the stirrups 32; the exterior of the arch centering steel bar 301 is provided with an arch centering circumferential positioning steel bar (not shown in the figure); the arch springing reinforcing steel bars 302 and the arch centering reinforcing steel bars 301 are provided with exposed connecting ribs 33. Wherein, the main muscle 30 of fender arch adopts HRB400 phi 22mm reinforcing bar interval 20cm, layer apart from 50cm, and the inlayer and inlayer protects the distance of encircleing main muscle 30 and be 600mm, distribution muscle 31 adopts HRB400 phi 16mm reinforcing bar interval 25cm, and distribution muscle 31's width is 458mm, stirrup 32 adopts HRB 300 phi 10mm reinforcing bar. 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 is bound outside the arch frame positioning steel bar to form the arch protection arch wall steel bar.
In a specific embodiment of the present invention, as shown in fig. 1 and 3, the outer form 4 is formed by assembling a plurality of boards, and the outer form 4 is installed symmetrically in a circumferential direction on both sides of the self-protection arch; 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. The concrete construction process is as follows:
the thickness of a single wood board of the outer template 4 is 5cm, the width is 20cm, and the length is 4-6.0 m; and a geotextile for blocking concrete leakage is arranged between two adjacent wood boards. In view of the concrete placement, because of having the small space between the plank of exterior sheathing and the plank, easily leak thick liquid, when concreting, carry out the leaking stoppage with materials such as geotechnological cloth, can prevent because of leaking the thick liquid, influence concrete quality.
The number of the horizontal steel pipes 7 at the root of the outer formwork 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 from each other by 0.6-1.0 m.
The utility model discloses a construction process flow as follows: modified soil backfilling → excavation of earth and stone, artificial trimming of an inner mold of an earth tyre → paving of an artificial leather isolating membrane → drilling and grouting of a foot locking steel pipe → construction of an arch foot arch protection foundation → binding and installation of arch truss positioning steel bars → installation of an outer template of an arch protection → arch protection and concrete pouring → dismantling of the outer template → maintenance → tamping of earth and stone → filling of a clay water-proof layer and planting of a soil layer.
To sum up, the utility model has the characteristics of the construction is simple and convenient, easily operation, utilize the construction of soil matrix centre form, reduce the steelframe installation time, avoid follow-up construction, the steelframe transfinites or the inside and outside appearance of quality unqualified of seeing in the hole. The utility model discloses can simplify construction process for the construction progress has shortened the time limit for a project, practices thrift the time of entering the hole, has practiced thrift construction cost.
The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
Claims (10)
1. The utility model provides a tunnel portal protects a section construction and uses native child mould structure which characterized in that: the soil tire inner mold is backfilled in the arch protection gap, arch protection arch wall reinforcing steel bars are sequentially bound and an outer template is laid outside the soil tire inner mold, the arch protection arch wall reinforcing steel bars comprise arch frame positioning reinforcing steel bars and arch foot reinforcing steel bars of an arch protection foundation, and the arch frame positioning reinforcing steel bars are arranged on the surface of the soil tire inner mold; an arch foot locking assembly used for being connected with a soil body is arranged at an arch foot position of the arch protection foundation, and the upper end of the arch foot locking assembly extends into the arch protection foundation.
2. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 1, wherein: and the deviation of the contour line of the inner mold of the soil tire is controlled within 2 cm.
3. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 1, wherein: the soil inner mould is formed by backfilling undisturbed soil or improved soil; and an artificial leather isolating membrane is paved outside the soil inner die.
4. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 1, wherein: the arch foot locking assembly comprises two groups of foot locking steel pipes, each group of foot locking steel pipes is two steel flower pipes capable of being filled with cement paste, every two steel flower pipes are arranged at the arch feet at two sides of the arch guard in an inverted V-shaped mode, and the two steel flower pipes are arranged in an inverted V-shaped mode and are drilled towards the oblique lower side of the outer side of each arch foot; the upper end of the steel perforated pipe is embedded in the arch protection foundation.
5. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 4, wherein: 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, the steel perforated pipes are arranged at intervals along the longitudinal direction of the retaining arch, and the distance between every two adjacent steel perforated pipes 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.
6. The earth form structure for construction of an arch protection segment of a tunnel portal according to any one of claims 1 to 5, wherein: 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; the arch springing reinforcing steel bars and the arch centering positioning reinforcing steel bars are provided with exposed connecting ribs.
7. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 6, wherein: 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.
8. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 6, wherein: the outer template is formed by assembling a plurality of wood boards, and the two sides of the self-protecting arch of the outer template are annularly and symmetrically arranged; and a steel bar hoop which can be connected with an embedded part in the arch protection foundation and the hoop positioning steel bars of the arch frame is arranged outside the outer template and used for fixing the outer template.
9. The earth moulding structure for construction of an arch protection segment of a tunnel portal according to claim 8, wherein: 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 earth form structure for construction of an arch protection segment of a tunnel portal according to claim 9, wherein: the thickness of a single wood board of the outer template is 5cm, the width of the single wood board is 20cm, and the length of the single wood board is 4-6.0 m; and a geotextile for blocking concrete leakage is arranged between two adjacent wood boards; the horizontal steel pipes are three steel pipes with the diameter of phi 89mm, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121358838.XU CN214997675U (en) | 2021-06-18 | 2021-06-18 | Earth mould structure for construction of tunnel portal arch protection section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121358838.XU CN214997675U (en) | 2021-06-18 | 2021-06-18 | Earth mould structure for construction of tunnel portal arch protection section |
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| Publication Number | Publication Date |
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| CN214997675U true CN214997675U (en) | 2021-12-03 |
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| CN202121358838.XU Active CN214997675U (en) | 2021-06-18 | 2021-06-18 | Earth mould structure for construction of tunnel portal arch protection section |
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2021
- 2021-06-18 CN CN202121358838.XU patent/CN214997675U/en active Active
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