CN112682070A - Tunnel reinforcing steel ring positioning and mounting process - Google Patents
Tunnel reinforcing steel ring positioning and mounting process Download PDFInfo
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- CN112682070A CN112682070A CN202011524134.5A CN202011524134A CN112682070A CN 112682070 A CN112682070 A CN 112682070A CN 202011524134 A CN202011524134 A CN 202011524134A CN 112682070 A CN112682070 A CN 112682070A
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Abstract
The application belongs to the technical field of tunnel construction processes, and particularly relates to a tunnel reinforcing steel ring positioning and mounting process. The method comprises the following steps: the structural positioning of the tunnel reinforcing steel ring determines the mounting position of the reinforcing steel ring; grouting and ring longitudinal processing of a reinforced steel ring; before grouting and water stopping, vertically drilling holes on longitudinal and circular seam parts without open water seepage around a seepage part until meeting a water expansion water stop strip or an elastic sealing gasket, and arranging a cement-water glass double-component slurry blocking layer in the holes; detecting and sampling a reinforced steel ring; selecting anchor bolts and allocating parameters; the application provides a tunnel reinforcing steel ring positioning installation process for improving the shield method construction effect, further improving the construction efficiency, avoiding various seepage, corrosion and deformation in the tunnel and reducing the probability of tunnel problems.
Description
Technical Field
The application belongs to the technical field of tunnel construction processes, and particularly relates to a tunnel reinforcing steel ring positioning and mounting process.
Background
The tunnel reinforcing steel ring is based on necessary hardware which is very important in the shield method tunnel construction process, the tunnel structure is fixed by arranging the steel reinforcing steel rings (which are manufactured after splicing and welding) with the similar diameters along the inner wall of the tunnel, the stability of the machine gun tunnel, meanwhile, the purposes of water prevention and isolation are realized, the subway construction of various domestic cities is continuously developed and put into operation, urban rail transit brings convenience and benefits to the travel of common people, but various unexpected problems can occur in the using process, including various plant diseases and insect pests, tunnel structure and water permeability change, which affect the normal operation of tunnel traffic and even bring serious potential safety hazard, and through statistical analysis, most problems and defects are closely related to the installation of the reinforced steel ring in the tunnel construction process, therefore, improvement and optimization are needed, and the probability of various problems in tunnel construction and later application is improved.
Content of application
The utility model provides a quality that installation can be consolidated to the steel loop is guaranteed to the aim at of this application, avoids the probability of taking place the problem in the later stage use.
In order to achieve the purpose, the following technical scheme is adopted in the application.
A tunnel reinforcing steel ring positioning and mounting process comprises the following steps:
(1) structural positioning of tunnel reinforcing steel ring
Determining the installation position of a reinforcing steel ring, wherein the installation position comprises a gravel layer section rich in confined water at the bottom of the tunnel and an area with more than 10cm of horizontal convergence of a segment;
(2) grouting and ring longitudinal processing of a reinforced steel ring;
before grouting and water stopping, vertically drilling holes on longitudinal and circular seam parts without open water seepage around a seepage part until meeting a water expansion water stop strip or an elastic sealing gasket, and arranging a cement-water glass double-component slurry blocking layer in the holes;
(3) reinforced steel ring detection sampling
The sampling proportion is not less than 10%, and the detection content and requirements comprise: basic size, and the allowable deviation of a measurement result is +/-2 mm;
the reinforcing steel rings are divided into 6 blocks, the reinforcing steel rings in the reinforcing range have cross shapes in different degrees, and steel ring blocks arranged in each reinforcing steel ring are predetermined through site lofting so as to ensure that the steel rings are attached to the inner wall of the duct piece, gaps between the steel rings and the duct piece are tightly filled with epoxy resin, and the using amount of the epoxy resin is based on the actual injection amount;
(4) anchor bolt type selection and allocation parameters
Anchoring adhesive: organic modified vinyl ester type anchor glue or modified vinyl ester type adhesive is adopted, and the anchor bolt adopts an inverted hammer-shaped chemical anchor bolt and an expanded base type anchor bolt.
Further refining of aforementioned tunnel reinforcing steel ring location installation technology, the reinforcing steel ring adopts 30 mm's Q345 steel to use E43xx type welding rod welding to form, and reinforcing steel ring width is not less than 1200mm, the reinforcing steel ring comprises 6 arc steel sheets, sees on the section of reinforcing steel ring, and each arc steel sheet uses the line on perpendicular to track surface as central line symmetric distribution, includes the fourth piecemeal that extends the central angle from the top to both sides and be 67, sets up to be 67 third piecemeal and fifth piecemeal that the central angle of fourth piecemeal both sides is 67, is 30 second piecemeal with the central angle of third piecemeal concatenation, is 20 first piecemeal with second piecemeal concatenation central angle, is 50 sixth piecemeal with fifth piecemeal concatenation central angle.
Further refining the tunnel reinforcing steel ring positioning and mounting process, carrying out injection or shot blasting treatment on steel for reinforcing steel ring production, wherein the surface cleanliness of the steel is not lower than Sa21/2The surface roughness is not lower than Rz 40-70 mu m; the reinforced steel ring body and the welding area are sprayed with polyurea anticorrosive coatings, the thickness of the polyurea layer is not less than 1.5mm, the thickness of the welding seam is not less than 2.5mm, and the thickness of the joint surfaces such as the interface and each hole is not less than 2 mm; and respectively spraying a primer and a finish on the inner side and the outer side of the polyurea coating.
Further refining the tunnel reinforcing steel ring positioning and mounting process, wherein the water absorption rate of the anchoring adhesive is not more than 0.05 percent, and the anchoring adhesive is directly used on site after being prepared and sealed by using fillers in a factory; particularly, for the anchoring adhesive for the inverted hanging surface, the vertical fluidity of the anchoring adhesive is not more than 2mm, and the thixotropic index is not less than 4.0; the effective life of the anchoring adhesive and the fatigue load resisting period are not less than 50 years; the chemical anchor bolt and the pedestal-expanded anchor bolt are subjected to hot-dip galvanizing antiseptic treatment, and the average thickness of a galvanizing layer is not less than 50 mu m.
Further refining the positioning and mounting process of the tunnel reinforcing steel ring, wherein the grouting and ring longitudinal treatment comprises the following steps: before grouting and water stopping, vertically drilling holes at the joint of longitudinal and circular seam parts without open water seepage around the seepage part until encountering a water expansion water stop strip or an elastic sealing gasket, arranging a cement-water glass double-component liquid slurry blocking layer in the holes, embedding grouting nozzles at the joint around the blocking point formed by each slurry blocking layer by using rapid-hardening polymer mortar and the like, blocking the joint by using epoxy cement, and finally injecting epoxy resin slurry; wherein the distance between grouting nozzles is not more than 100mm, the grouting pressure is not more than 0.3MPa, the grouting flow is 6-8L/min, and the grouting range extends to at least 25 degrees towards two sides by taking a transverse or vertical joint as a central line.
Further refining the tunnel reinforcing steel ring positioning and mounting process, wherein in the slurry formed by the cement-water glass double components, the water-cement ratio of the cement slurry is 0.6-1.0, the water glass modulus is 2.4-3.2, and the concentration is 30 DEG Be'; the volume ratio of the cement to the water glass is 1: 0.2-1: 1.1; the solid content of the epoxy resin slurry is not less than 60%, the initial viscosity is not more than 20mPa & s, and the surface drying time is not more than 12 h; the tensile bonding strength of the epoxy resin is not less than 2.5Mpa under different working conditions.
Further refining the tunnel reinforcing steel ring positioning and mounting process, carrying out rust removal and corrosion prevention treatment before the reinforcing steel ring is machined, formed and delivered out of a factory, and ensuring that the thickness of the once corrosion prevention spray ditch in the fields on the inner arc surface of the reinforcing steel ring meets the design requirement; before the reinforced steel ring is assembled, performing interface treatment such as hand hole filling, ring longitudinal seam treatment, duct piece repairing, surface chiseling, water leakage treatment and the like on the road lining in the reinforcing range; after the interface treatment meets the design requirements, the reinforced steel ring can be installed; before formal assembly of the reinforced steel ring, one-ring pre-assembly is carried out so as to evaluate the assembly effect and control the assembly precision.
The application provides a tunnel reinforcing steel ring positioning installation process for improving the shield method construction effect, further improving the construction efficiency, avoiding various seepage, corrosion and deformation in the tunnel and reducing the probability of tunnel problems.
Drawings
Fig. 1 is a schematic view of the structure of a reinforced steel ring.
Detailed Description
The present application will be described in detail with reference to specific examples.
The tunnel reinforcing steel ring positioning and mounting process comprises the following steps:
a tunnel reinforcing steel ring positioning and mounting process comprises the following steps:
(1) structural positioning of tunnel reinforcing steel ring
Determining the installation position of a reinforcing steel ring, wherein the installation position comprises a gravel layer section rich in confined water at the bottom of the tunnel and an area with more than 10cm of horizontal convergence of a segment;
(2) grouting and ring longitudinal processing of a reinforced steel ring;
before grouting and water stopping, vertically drilling holes on longitudinal and circular seam parts without open water seepage around a seepage part until meeting a water expansion water stop strip or an elastic sealing gasket, and arranging a cement-water glass double-component slurry blocking layer in the holes;
the reinforcing steel ring is arranged after grouting of a segment crack and treatment of ring longitudinal
The grouting and ring longitudinal treatment refers to: before grouting and water stopping, vertically drilling holes at the joint of longitudinal and circular seam parts without open water seepage around the seepage part until encountering a water expansion water stop strip or an elastic sealing gasket, arranging a cement-water glass double-component liquid slurry blocking layer in the holes, embedding grouting nozzles at the joint around the blocking point formed by each slurry blocking layer by using rapid-hardening polymer mortar and the like, blocking the joint by using epoxy cement, and finally injecting epoxy resin slurry; the distance between grouting nozzles is not more than 100mm, grouting pressure is not more than 0.3MPa, grouting flow is 6-8L/min, and the grouting range extends to two sides at least 25 degrees by taking a transverse or vertical seam as a central line;
in the slurry composed of the cement-water glass double components, the water-cement ratio of the cement slurry is 0.6-1.0, the water glass modulus is 2.4-3.2, and the concentration is 30 DEG Be'; the volume ratio of the cement to the water glass is 1: 0.2-1: 1.1;
the solid content of the epoxy resin slurry is not less than 60%, the initial viscosity is not more than 20mPa & s, and the surface drying time is not more than 12 h; the tensile bonding strength of the epoxy resin is not less than 2.5Mpa under different working conditions;
(3) reinforced steel ring detection sampling
The sampling proportion is not less than 10%, and the detection content and requirements comprise: basic size, and the allowable deviation of a measurement result is +/-2 mm;
the reinforcing steel rings are divided into 6 blocks, the reinforcing steel rings in the reinforcing range have cross shapes in different degrees, and steel ring blocks arranged in each reinforcing steel ring are predetermined through site lofting so as to ensure that the steel rings are attached to the inner wall of the duct piece, gaps between the steel rings and the duct piece are tightly filled with epoxy resin, and the using amount of the epoxy resin is based on the actual injection amount;
as shown in fig. 1, the reinforcing steel ring is formed by welding 30mm of Q345 steel by using an E43xx type welding rod, the width of the reinforcing steel ring is not less than 1200mm, the reinforcing steel ring is composed of 6 arc-shaped steel plates, and each arc-shaped steel plate is symmetrically distributed by taking a line perpendicular to the surface of a track as a center line when viewed from the cross section of the reinforcing steel ring, and comprises a fourth block extending from the top to two sides, a third block and a fifth block, wherein the central angle of the fourth block is 67 degrees, the third block and the fifth block are arranged at two sides of the fourth block, the second block is spliced with the third block, the central angle of the second block is 30 degrees, the first block is spliced with the second block, and the sixth block is spliced with the fifth block, the central angle of the first block is 20 degrees, and the fourth block is spliced with the fifth block is 50 degrees;
the steel for producing the reinforced steel ring is sprayed or shot-blasted, and the surface cleanliness of the steel is not lower than Sa21/2The surface roughness is not lower than Rz 40-70 mu m; the reinforced steel ring body and the welding area are sprayed with polyurea anticorrosive coatings, the thickness of the polyurea layer is not less than 1.5mm, the thickness of the welding seam is not less than 2.5mm, and the thickness of the joint surfaces such as the interface and each hole is not less than 2 mm; and respectively spraying a primer and a finish on the inner side and the outer side of the polyurea coating.
Before the reinforced steel ring is assembled, performing interface treatment such as hand hole filling, ring longitudinal seam treatment, duct piece repairing, surface chiseling, water leakage treatment and the like on the road lining in the reinforcing range; after the interface treatment meets the design requirements, the reinforced steel ring can be installed; before formal assembly of the reinforced steel ring, one-ring pre-assembly is carried out so as to evaluate the assembly effect and control the assembly precision.
(4) Anchor bolt type selection and allocation parameters
Anchoring adhesive: adopting organic modified vinyl ester type anchor adhesive or modified vinyl ester adhesive, wherein the water absorption rate of the anchor adhesive is not more than 0.05 percent, adopting filling materials in a factory to prepare the adhesive, sealing and directly using the adhesive on site; particularly, for the anchoring adhesive for the inverted hanging surface, the vertical fluidity of the anchoring adhesive is not more than 2mm, and the thixotropic index is not less than 4.0; the effective life of the anchoring adhesive and the fatigue load resisting period are not less than 50 years;
the anchor bolt adopts an inverted hammer-shaped chemical anchor bolt and a bottom-expanding type anchor bolt, the chemical anchor bolt and the bottom-expanding type anchor bolt adopt hot-dip galvanizing antiseptic treatment, the average thickness of a zinc coating is not less than 50 mu m,
finally, although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present application.
Claims (7)
1. The utility model provides a tunnel reinforcement steel loop location mounting process which characterized in that includes:
(1) structural positioning of tunnel reinforcing steel ring
Determining the installation position of a reinforcing steel ring, wherein the installation position comprises a gravel layer section rich in confined water at the bottom of the tunnel and an area with more than 10cm of horizontal convergence of a segment;
(2) grouting and ring longitudinal processing of a reinforced steel ring;
before grouting and water stopping, vertically drilling holes on longitudinal and circular seam parts without open water seepage around a seepage part until meeting a water expansion water stop strip or an elastic sealing gasket, and arranging a cement-water glass double-component slurry blocking layer in the holes;
(3) reinforced steel ring detection sampling
The sampling proportion is not less than 10%, and the detection content and requirements comprise: basic size, and the allowable deviation of a measurement result is +/-2 mm;
the reinforcing steel rings are divided into 6 blocks, the reinforcing steel rings in the reinforcing range have cross shapes in different degrees, and steel ring blocks arranged in each reinforcing steel ring are predetermined through site lofting so as to ensure that the steel rings are attached to the inner wall of the duct piece, gaps between the steel rings and the duct piece are tightly filled with epoxy resin, and the using amount of the epoxy resin is based on the actual injection amount;
(4) anchor bolt type selection and allocation parameters
Anchoring adhesive: organic modified vinyl ester type anchor glue or modified vinyl ester type adhesive is adopted, and the anchor bolt adopts an inverted hammer-shaped chemical anchor bolt and an expanded base type anchor bolt.
2. The tunnel reinforcing steel ring positioning and mounting process as claimed in claim 1, wherein the reinforcing steel ring is formed by welding 30mm of Q345 steel by using E43xx type welding rods, the width of the reinforcing steel ring is not less than 1200mm, the reinforcing steel ring is composed of 6 arc-shaped steel plates, and each arc-shaped steel plate is symmetrically distributed by taking a line perpendicular to the surface of the rail as a center line when viewed from the cross section of the reinforcing steel ring, and comprises a fourth block, a third block and a fifth block, wherein the fourth block extends from the top to two sides, the center angle of the fourth block is 67 degrees, the third block and the fifth block are arranged on two sides of the fourth block, the second block is spliced with the third block, the first block is spliced with the second block, the center angle of the first block is 20 degrees, and the sixth block is spliced with the fifth block, the center angle of the sixth block is 50 degrees.
3. The tunnel reinforcing steel ring positioning and mounting process as claimed in claim 2, wherein the steel for producing the reinforcing steel ring is subjected to spraying or shot blasting treatment, and the surface cleanliness of the steel is not lower than Sa21/2The surface roughness is not lower than Rz 40-70 mu m; the reinforced steel ring body and the welding area are sprayed with polyurea anticorrosive coatings, the thickness of the polyurea layer is not less than 1.5mm, the thickness of the welding seam is not less than 2.5mm, and the thickness of the joint surfaces such as the interface and each hole is not less than 2 mm; and respectively spraying a primer and a finish on the inner side and the outer side of the polyurea coating.
4. The process for positioning and installing the tunnel reinforcing steel ring according to claim 1, wherein the water absorption rate of the anchoring adhesive is not more than 0.05%, and the anchoring adhesive is directly used on site after being made of factory fillers and sealed; particularly, for the anchoring adhesive for the inverted hanging surface, the vertical fluidity of the anchoring adhesive is not more than 2mm, and the thixotropic index is not less than 4.0; the effective life of the anchoring adhesive and the fatigue load resisting period are not less than 50 years; the chemical anchor bolt and the pedestal-expanded anchor bolt are subjected to hot-dip galvanizing antiseptic treatment, and the average thickness of a galvanizing layer is not less than 50 mu m.
5. The tunnel reinforcing steel ring positioning and mounting process according to claim 1, wherein the grouting and ring longitudinal treatment is as follows: before grouting and water stopping, vertically drilling holes at the joint of longitudinal and circular seam parts without open water seepage around the seepage part until encountering a water expansion water stop strip or an elastic sealing gasket, arranging a cement-water glass double-component liquid slurry blocking layer in the holes, embedding grouting nozzles at the joint around the blocking point formed by each slurry blocking layer by using rapid-hardening polymer mortar and the like, blocking the joint by using epoxy cement, and finally injecting epoxy resin slurry; wherein the distance between grouting nozzles is not more than 100mm, the grouting pressure is not more than 0.3MPa, the grouting flow is 6-8L/min, and the grouting range extends to at least 25 degrees towards two sides by taking a transverse or vertical joint as a central line.
6. The tunnel reinforcing steel ring positioning and mounting process according to claim 5, wherein in the slurry composed of cement and water glass double components, the water-cement ratio of the cement slurry is 0.6-1.0, the water glass modulus is 2.4-3.2, and the concentration is 30 degrees Be'; the volume ratio of the cement to the water glass is 1: 0.2-1: 1.1; the solid content of the epoxy resin slurry is not less than d 60%, the initial viscosity is not more than 20mPa & s, and the surface drying time is not more than 12 h; the tensile bonding strength of the epoxy resin is not less than 2.5Mpa under different working conditions.
7. The tunnel reinforcing steel ring positioning and mounting process as claimed in claim 1, wherein the reinforcing steel ring is subjected to rust removal and corrosion prevention treatment before being processed and formed out of a factory, and the thickness of the once corrosion prevention spray ditch in the fields on the inner arc surface of the reinforcing steel ring meets design requirements; before the reinforced steel ring is assembled, performing interface treatment such as hand hole filling, ring longitudinal seam treatment, duct piece repairing, surface chiseling, water leakage treatment and the like on the road lining in the reinforcing range; after the interface treatment meets the design requirements, the reinforced steel ring can be installed; and pre-assembling a ring before formal assembly of the reinforced steel ring so as to evaluate the assembly effect and control the copper assembly precision.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011524134.5A CN112682070A (en) | 2020-12-22 | 2020-12-22 | Tunnel reinforcing steel ring positioning and mounting process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011524134.5A CN112682070A (en) | 2020-12-22 | 2020-12-22 | Tunnel reinforcing steel ring positioning and mounting process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263370A (en) * | 2022-06-30 | 2022-11-01 | 武汉容晟吉美科技有限公司 | Construction process for grouting of tunnel reinforcing steel ring sheet |
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2020
- 2020-12-22 CN CN202011524134.5A patent/CN112682070A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263370A (en) * | 2022-06-30 | 2022-11-01 | 武汉容晟吉美科技有限公司 | Construction process for grouting of tunnel reinforcing steel ring sheet |
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