CN114382505A - Steel lining reinforcing method - Google Patents
Steel lining reinforcing method Download PDFInfo
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- CN114382505A CN114382505A CN202210209168.8A CN202210209168A CN114382505A CN 114382505 A CN114382505 A CN 114382505A CN 202210209168 A CN202210209168 A CN 202210209168A CN 114382505 A CN114382505 A CN 114382505A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 149
- 239000010959 steel Substances 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 claims abstract description 42
- 238000003466 welding Methods 0.000 claims abstract description 29
- 239000003822 epoxy resin Substances 0.000 claims abstract description 19
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 230000008707 rearrangement Effects 0.000 claims abstract description 7
- 239000004760 aramid Substances 0.000 claims abstract description 4
- 229920003235 aromatic polyamide Polymers 0.000 claims abstract description 4
- 229920006333 epoxy cement Polymers 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 238000002203 pretreatment Methods 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 claims description 24
- 230000002787 reinforcement Effects 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 4
- 229920002635 polyurethane Polymers 0.000 claims description 4
- 239000004814 polyurethane Substances 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 description 7
- 238000000576 coating method Methods 0.000 description 7
- 229920002396 Polyurea Polymers 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 239000004567 concrete Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005488 sandblasting Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 239000004432 silane-modified polyurethane Substances 0.000 description 1
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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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
-
- 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
- E21D11/155—Laggings made of strips, slats, slabs or sheet piles
-
- 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
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/40—Devices or apparatus specially adapted for handling or placing units of linings or supporting units for tunnels or galleries
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a steel lining reinforcing method, which aims to solve the technical problems of complex process, high construction difficulty, low efficiency and insufficient stability of the existing reinforcing mode. The invention comprises the following steps: s1: preparing in an early stage; s2: treating tunnel water leakage; s3: performing crack treatment, namely grouting and reinforcing cracks outside a steel ring reinforcing area, and then pasting aramid fabric, wherein the cracks in the steel ring reinforcing area are reinforced by adopting a steel ring; s4: pre-treating segments in the tunnel, namely plugging annular and longitudinal joints of the segments by adopting epoxy resin and epoxy cement, and performing alternate construction on the segment pre-treatment and the pipeline rearrangement; s5: mounting a steel ring lining, which comprises sequentially mounting a bottom plate, a side plate and a top plate, assembling and welding the bottom plate, the side plate and the top plate to manufacture a steel ring, and performing pressure injection of epoxy resin; s6: and finally, recovering the pipeline and the walkway bed. The invention has the beneficial effects that: high construction efficiency, low process difficulty and stable construction structure.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a steel lining reinforcing method.
Background
With the continuous development of economic society, rail transit becomes an important vehicle in cities, and particularly in recent years, the development of subways has reached a high tide. As a part of urban area functions, subways and building structures are always combined, the building of the subways needs to protect the building structures, but for the building structures which are long in the years, nearby stratums are relatively sensitive, the mutual influence of the subways is not considered in the design of the building structures, and the shield tunnel structure needs to be reinforced in order to ensure the safety of the shield tunnel structure and the later-period operation safety. In the prior art, reinforced concrete reinforcement is adopted, the process is complex, the construction difficulty is high, the efficiency is low, and the stability is insufficient.
Disclosure of Invention
The invention provides a steel lining reinforcing method, which aims to solve the technical problems of complex process, high construction difficulty, low efficiency and insufficient stability of the existing shield tunnel structure reinforcing mode.
In order to solve the technical problems, the invention adopts the following technical scheme:
a steel lining reinforcing method is designed, and comprises the following steps:
s1: early preparation, which comprises the steps of pipeline rearrangement, removal of a road plate and temporary laying of a power circuit;
s2: treating the water leakage of the tunnel, including polyurethane grouting behind the wall and leakage treatment of the annular longitudinal seam;
s3: performing crack treatment, namely grouting and reinforcing cracks outside a steel ring reinforcing area, and then pasting aramid fabric, wherein the cracks in the steel ring reinforcing area are reinforced by adopting a steel ring;
s4: pre-treating segments in the tunnel, namely plugging annular and longitudinal joints of the segments by adopting epoxy resin and epoxy cement, and performing alternate construction on the segment pre-treatment and the pipeline rearrangement;
s5: mounting a steel ring lining, which comprises sequentially mounting a bottom plate, a side plate and a top plate, assembling and welding the bottom plate, the side plate and the top plate to manufacture a steel ring, and performing pressure injection of epoxy resin;
s6: and finally, recovering the pipeline and the walkway bed.
Furthermore, before the steel ring is installed, real-scene data are generated by means of three-dimensional laser scanning, steel plate blanking numbering is carried out on positions needing reinforcement one by one according to the data, and each steel plate is lofted in advance before construction, so that the minimum fit clearance between the steel plate and the tunnel wall is guaranteed.
Further, in step S4, the cross-shaped seam of the pipe sheet in the installation range of the steel ring is cleaned and filled with epoxy resin, and if the original plugged hand hole in the installation range of the steel ring is broken and loosened, the broken part is firstly knocked out, and then quick-drying cement is used for repairing.
Further, in step S5, the steel ring has a width of 1200mm and a thickness of 30mm, and includes 2 bottom plates, 2 side plates, and 1 top plate, wherein the bottom plate has an arc length of 1.8m, and the side plates and the top plate have an arc length of 3.2 m.
Furthermore, in step S5, the bottom steel plates on both sides are measured, installed and positioned, the side plates are assembled from the annular steel plates on the bottoms on both sides, and finally the top annular plate is installed, the steel plates are fixed by using concrete cracking type and M16/8.8-grade special inverted hammer-shaped chemical anchor bolts, each steel plate is fixed by using bottom-expanding type anchor bolts at four corners and the middle part during installation, and then the chemical anchor bolts are permanently fixed by manual work.
Further, the steel ring lining assembly comprises the following steps:
1. the internal combustion engine headstock carries construction flatbed equipment to go safely and arrive the construction site (tunnel interval).
2. The landing legs and the rotary turntable are mechanically locked and unlocked, the equipment power switch is turned on, the equipment instrument and the audible and visual alarm are checked to be normal, the pump station is started, and the landing legs on the two sides are respectively supported with the side face of the tunnel (the angle is adjusted according to actual conditions), so that the flat car is balanced.
3. And hoisting the pipe piece with the length of 1.8 meters to the concrete pipe piece by using a truck on the construction flat car for mounting.
4. And adjusting the segment lifting platform oil cylinder to enable the segment to rise to a height of more than 1.1 m, and fixing the connecting plate in the middle of the end of the segment by four high-strength bolts.
5. The duct piece is fixedly locked with the mechanical arm clamp: adjusting the angles of the telescopic arm, the two arms and the small arm, connecting the locking device with the connecting plate fixing pin, lifting the duct piece by adjusting the angles of the telescopic arm and the two arms, and locking the locking device with the connecting plate fixing pin (the positioning arc of the locking device is in close contact with the connecting plate fixing pin, and the mechanical locking device is fixed and locked).
6. Adjusting the position of the mounting segment:
firstly, the angles of the telescopic arm and the two arms are adjusted, and the pipe piece is lifted to a position about 3.8 meters away from the track surface (adjusted according to the actual condition).
Adjusting the angles of the ejection oil cylinders 1 and 2, and lifting to a position 1.5 meters away from the vehicle surface of the flat plate.
And thirdly, rotating the turntable to 900 left (or right), and in the rotating process, adjusting the angle and the length of the telescopic arm to enable the duct piece to be far away from the pipeline in the tunnel.
And fourthly, adjusting the angles and the lengths of the telescopic arms and the two arms to ensure that the distance between the duct piece and the circular arc of the tunnel is less than 100mm (the duct piece and the circular arc of the tunnel are concentric).
Adjusting the angle of the telescopic arm and the two arms to rotate the duct piece to the installation position.
Sixthly, adjusting the rotation angle of the plate to ensure that the pipe piece is vertical to the arc surface of the tunnel.
If the pipe piece is longitudinally deviated from the reinforcing position, the moving oil cylinder is adjusted to move the pipe piece to the reinforcing position.
Adjusting the length of the telescopic arm to enable the duct piece to be tightly attached to the arc surface of the tunnel.
Ninthly, if the gap between the duct piece and the arc surface of the tunnel is too large, the duct piece is tightly attached to the arc surface of the tunnel by adjusting the angles and the lengths of the ejection oil cylinders on the two sides.
7. And the pipe piece is firmly fixed by using m16/8.8 flared bolts.
8. And (3) installing a steel ring lining, wherein the installing comprises the following steps of installing a bottom plate, installing side plates and installing a top plate in sequence, and then assembling and welding the bottom plate, the side plates and the top plate to manufacture the steel ring and perform pressure injection of epoxy resin.
9. And finally, recovering the pipeline and the walkway bed.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the invention uses the three-dimensional laser scanner to measure the pay-off, scans and actually measures the existing shape of each ring of the duct piece of the tunnel, and carries out steel plate blanking according to the three-dimensional model, thereby ensuring the close fit of the steel plate and the actual tunnel wall and the engineering construction quality.
2. According to the invention, the steel lining is reinforced in a blocking manner by the assembling machine, then the steel plate is welded into the steel ring, and the efficiency is improved and the construction difficulty is reduced by a construction mode from part to the whole.
3. The invention adopts a steel plate structure, can be coated with anticorrosive paint, ensures the construction quality and prolongs the service life.
Drawings
FIG. 1 is a process flow diagram of the steel lining reinforcement method of the present invention.
FIG. 2 is a schematic diagram of the three-dimensional acquisition construction steps of the present invention.
Fig. 3 is a schematic view of the segment block of the present invention.
In the figure, 1 is a left bottom plate, 2 is a left side plate, 3 is a top plate, 4 is a right side plate, and 5 is a right bottom plate.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
Example (b): a method for reinforcing a steel lining for a shield tunnel structure, see fig. 1, comprising the steps of:
1) the early preparation process comprises the following steps: and finishing a series of preparation works before construction, such as rearrangement of various pipelines, temporary laying of power lines and the like.
2) Treating tunnel water leakage: including polyurethane grouting behind the wall and annular longitudinal seam leakage treatment.
3) And (3) crack treatment: the segment cracks need grouting reinforcement, aramid cloth is pasted after the segment cracks outside the steel ring reinforcement area are grouted and reinforced, and steel ring reinforcement is adopted in the steel ring reinforcement area.
4) Pretreatment of pipe pieces in the tunnel: the related duct pieces are subjected to ring and longitudinal seam plugging treatment by adopting epoxy resin and epoxy daub.
5) The installation work of the steel ring is carried out after the steel ring is installed on the manipulator in place and other preparation works are finished completely, and the method specifically comprises the following steps:
firstly, duct piece pretreatment and pipeline rearrangement are conducted to insert construction, so that the working efficiency is increased;
secondly, immediately performing lofting, machining and installation on the bottom plate after partial early construction is completed;
after the bottom plate is installed, subsequent lofting and machining work of the side plate and the top plate is carried out;
fourthly, after a certain number of bottom plates are installed, installing side plates and top plates;
fifthly, after the bottom plate, the side plates and the top plate are finished, welding steel ring support ring formation is carried out;
and sixthly, performing the pressure injection work of the epoxy resin after the steel ring support ring is welded.
The first to the fifth steps can be used for running water construction, and the total construction period is saved.
6) Before the steel ring is assembled, the steel ring needs to be subjected to corrosion prevention and fire prevention treatment.
7) And finally, recovering the pipeline and the track bed.
8) The steel ring assembling machine and the flat plate maintenance are used for preparing spare parts before construction, finishing maintenance and debugging work, and regular maintenance is needed in the construction process.
9) Treating the leakage water in the tunnel by adopting a method of combining inside and outside to comprehensively treat the leakage stoppage of the tunnel, wherein the leakage water of the large-area tunnel is treated by firstly adopting a method of pressing and injecting polyurethane behind a pipe piece wall; plugging the ring and longitudinal seams of the water leakage pipe pieces in the tunnel; and the leakage water at other positions is treated by adopting a grouting water stopping mode. The description of the specific steps is performed in sections below.
1. Preparation for construction
Before construction, the cable is drawn into a tunnel in a low-voltage distribution room of a station, and the specification of the cable is calculated according to the power and the transmission distance of mechanical power equipment, electrical tools and lighting electricity required by construction.
2. Tunnel existing shape measurement and positioning
The three-dimensional laser scanning technology is also called as a three-dimensional live-action copying technology, and is used for acquiring three-dimensional information of any complex field environment and space target in a fast, non-contact and high-precision mode, and fast reconstructing various data with three-dimensional coordinates such as a three-dimensional model, a line, a surface, a body and a space of the target. Referring to fig. 2, steel plate blanking numbering is carried out on the reinforced positions one by one according to generated data, and each steel plate is lofted in advance before construction, so that the steel plate and the tunnel wall are attached to ensure the minimum interval, and the reinforcement construction quality is ensured.
3. Duct piece dust removal cleaning device
All duct pieces in the construction range need to be cleaned by dust removal, the radian of the duct pieces is guaranteed to be flat, no water leakage exists, and particularly, unevenness and calcification generated after the original duct pieces are subjected to plugging work need to be timely treated according to the standard requirements.
4. Epoxy resin injection preparation before installation
(1) Cleaning the cross joint of the pipe sheet in the steel ring installation range, and filling the cross joint with epoxy resin;
(2) if the original plugging hand hole is cracked and loosened in the installation range of the steel ring, the cracked part is firstly knocked out, then quick-drying cement is used for repairing, and in order to ensure the operation safety and avoid the controlled plugging material falling event, the hand hole plugging at the top position is completed on the same day of installing the top block steel plate.
5. Steel ring block
(1) Principle of block division
Considering the whole stress effect, the number of blocks is as small as possible, and meanwhile, the joints avoid the position of the transverse joints of the duct pieces;
secondly, considering the safety of installation and welding, the pipeline and the bracket are avoided as much as possible at the blocking position;
and thirdly, considering the theoretical lifting capacity of the erector and convenient installation, the single block cannot be too large.
(2) Size, specification, block. Referring to fig. 3:
the width of the steel ring is 1200mm, and the thickness of the steel ring is 30 mm. The steel ring is divided into 5 blocks, 2 blocks at the bottom (a left bottom plate 1 and a right bottom plate 5) and 3 ring plates at the upper part (a left side plate 2, a top plate 3 and a right side plate 4);
the arc length of the bottom steel plate is about 1.8 m;
thirdly, the upper half ring is divided into 3 blocks by considering to avoid various bent frames in the tunnel, and the arc length of each block is about 3.2 m;
fourthly, spraying the steel plate with polyurea on the inner arc surface to form an anticorrosive steel plate: the SPUR (spray polyurea elastomer) coating is adopted for corrosion prevention treatment. The thickness of the coating is uniform, and the coating is sprayed in two layers, and the total thickness is not less than 1.2 mm; after the installation is finished, spraying fireproof materials, wherein the fireproof limit is 2.5 hours;
the steel plate is made of: the material is Q345B, and the welding adopts CO2 gas shielded welding.
6. Step of installing steel plate
The steel ring steel plate is installed on site by adopting a power flat car and an assembling machine, the internal combustion locomotive pulls the flat car to transport and install the steel plates, the assembling machine is placed and fixed on the flat car, the assembling machine places the steel plates at a specified height and position, and the steel plates are combined with an original tunnel in an anchor bolt mode.
(1) Firstly, the steel plates at the bottoms of the two sides are measured, installed and positioned, the side plates are assembled from the annular steel plates at the bottoms of the two sides, and finally the top annular plate is installed.
(2) Fixing an annular steel plate:
firstly, before the expansion bolts and the chemical bolts are installed on the annular steel plate, lofting and distribution are carried out on the pipe piece, drilling is completed, and hole sites are reserved on the annular plate according to the specific size and the corresponding positions of the bolts;
and fixing the annular steel plate immediately after the annular steel plate is in place. The steel sheet adopts concrete fracture type, M16/8.8 level special inverted hammer shape chemical anchor bolt fixed, and every steel sheet adopts the type of expanding the base crab-bolt earlier during the installation fixed (arranging four corners and middle part), and follow-up utilization manual point time carries out chemical anchor bolt permanent fixation, and the chemical anchor bolt installation meets hand hole, section of jurisdiction bolt department can make the suitable position adjustment. Wherein the top plate 3 is fixed by 8 bottom expanding type anchor bolts, and other steel plates are fixed by 6 bottom expanding type anchor bolts. The bottom expanding anchor bolts are all M16/8.8-grade effective anchoring depth not less than 125 mm;
embedding the bolts in sequence by adopting a hole array mode;
fourthly, the installed annular steel plates are required to be fixed;
the annular steel plate and the annular steel plate are positioned by spot welding, and finally the joint is assembled by groove welding, so that the welding seam is full;
sixthly, reserving a hole phi 110 in the original grouting hole position of the duct piece by the steel plate to meet the special grouting requirement.
(3) The assembling process of the steel lining segment assembling machine comprises the following steps:
firstly, the internal combustion engine head pulls and carries construction flat car equipment to safely travel to a construction site (tunnel region).
And secondly, mechanically locking and unlocking the supporting legs and the rotary turntable, opening a power switch of the equipment, checking that the equipment instrument and the audible and visual alarm are normal, starting the pump station, and supporting the supporting legs at two sides with the side surface of the tunnel respectively (adjusting the angle according to actual conditions) to balance the flat car.
Thirdly, the segment with the length of 1.8 meters is hoisted to the concrete segment by using a vehicle on the construction flat car to be installed.
Adjusting the oil cylinder of the segment lifting platform to enable the segment to rise to a height of more than 1.1 m, and fixing the connecting plate in the middle of the end of the segment by four high-strength bolts.
And (6) fixedly locking the duct piece and a mechanical arm clamp: adjusting the angles of the telescopic arm, the two arms and the small arm, connecting the locking device with the connecting plate fixing pin, lifting the duct piece by adjusting the angles of the telescopic arm and the two arms, and locking the locking device with the connecting plate fixing pin (the positioning arc of the locking device is in close contact with the connecting plate fixing pin, and the mechanical locking device is fixed and locked).
Adjusting the position of the mounting duct piece:
1. the angles of the telescopic arm and the two arms are adjusted, and the duct piece is lifted to a position about 3.8 meters away from the track surface (can be properly adjusted according to the actual condition).
2. And adjusting the angles of the ejection oil cylinders 1 and 2, and lifting to a position 1.5 meters away from the vehicle surface of the flat plate.
3. The rotary disc is rotated to the left (or right) to 900 degrees, and in the rotating process, the tube piece is far away from the pipeline in the tunnel by adjusting the angle and the length of the telescopic arm.
4. The angle and the length of the telescopic arm and the two arms are adjusted to ensure that the distance between the duct piece and the tunnel arc is less than 100mm (the duct piece and the tunnel arc are concentric).
5. The angles of the telescopic arm and the two arms are adjusted to enable the duct piece to rotate to the installation position.
6. And the rotation angle of the plate is adjusted to ensure that the duct piece is vertical to the arc surface of the tunnel.
7. If there is a deviation between the tube piece and the reinforcing position, the movable oil cylinder is adjusted to move the tube piece to the reinforcing position.
8. The length of the telescopic arm is adjusted to ensure that the duct piece is tightly attached to the arc surface of the tunnel.
9. If the gap between the duct piece and the arc surface of the tunnel is too large, the duct piece is tightly attached to the arc surface of the tunnel by adjusting the angles and the lengths of the ejection oil cylinders on the two sides.
Seventhly, the pipe piece is firmly fixed by using m16/8.8 expanding bolts. And returning all the oil cylinder devices of the assembling machine to the positions before the steel pipe sheet is installed, completing the installation of the steel pipe sheet, and performing preparation work before the installation of the next steel pipe sheet.
7. Ring welding of steel ring
1) After the annular steel plates are completely installed, the steel plates are integrally welded to ensure that the internal support forms a good stressed whole, and the effect of reinforcing and supporting the tunnel is achieved.
2) All steel plates in the steel ring are spliced by groove welding, the height of a welding line is the same as the thickness of the plate, effective measures are taken during welding, and the steel plate is prevented from being deformed too much. The welding requirement is as follows: the welding line has uniform appearance, smooth transition between welding beads and basic metal, and clean removal of welding slag and splashes; the undercut depth is less than or equal to 0.05t and less than or equal to 0.5mm, the continuous length is less than or equal to 100mm, and the total undercut length on the two sides is less than or equal to 10 percent of the weld length; the depth of the joint gap is less than or equal to 0.05t and less than or equal to 0.5, and the position in the welding line per 1000mm of length cannot exceed 1; surface porosity, cracks, arc gouging are not allowed.
3) Welding rods: type E43, using CO2And (4) gas shielded welding. All indexes of steel structure welding meet the steel structure welding specification (GB 50661-2011), and thread deformation welding is strictly prevented.
8. Steel ring wall back epoxy filling
The epoxy resin (choose rigid epoxy for use) pressure between annular steel plate and the section of jurisdiction is immediately gone up to carry out after the installation of annular steel ring is accomplished and is annotated the filling work, considers that some section of jurisdiction has the wrong platform, and average clearance is according to being not more than 2.5cm control, so the epoxy resin should prepare abundant quantity before the construction of pressure notes. After the annular steel plate is in place, the joints between the two sides of the radian of the steel plate and the segment are plugged by epoxy cement paste; and grouting holes and air outlet holes are blocked and reserved on two sides of the ring plate. Not less than 4 pieces of steel plates are arranged on each steel plate. A movable operation platform is erected by utilizing a movable flat plate, a small electric grouting pump is adopted for grouting epoxy resin, the grouting sequence is from bottom to top until the upper preformed hole overflows the resin, and the grouting is repeatedly carried out. The performance requirements of the rigid epoxy resin slurry are shown in table 1 below.
TABLE 1 Performance index of rigid epoxy resin slurries
9. Ballast bed and pipeline rehabilitation
And after the steel ring construction is finished, restoring construction of the ballast bed is carried out according to design requirements, and the principle of ensuring the line shape to be smooth is adopted for restoration. After the tunnel is reinforced, the rearranged pipelines are required to be selectively restored according to the specific conditions of the site so as to ensure the operation safety of the subway and the normal operation of each pipeline device and facility. The pipeline bracket is fixed on the pipe sheet in the gap between the front steel ring and the rear steel ring or welded and fixed on the steel rings, the reinforcing strength and the firmness need to meet the relevant standard requirements, and the relevant requirements of corrosion resistance and fire resistance of the welding position are the same as those of the steel rings; the evacuation platform support fixing bolt is welded and fixed on the steel ring, and the original state of the evacuation platform is recovered.
10. Steel ring corrosion-resistant and fire-proof treatment
The service life of the steel lining is not less than 50 years, and the steel lining is subjected to high-requirement rust-proof and corrosion-proof treatment before entering a field, wherein the specific requirements are as follows:
1) the anticorrosion process and the required pretreatment: the steel ring is sprayed with polyurea for corrosion prevention. The steel surface should be subjected to sand blasting or shot blasting to remove rust to reach grade Sa21/2 specified in national standard GB8923 visual assessment of surface cleanliness of steel surface treatment before coating, the surface roughness Rz is 40-70 μm, the surface should be subjected to anticorrosion construction within three hours after being treated, and if the surface has a rust return phenomenon, the surface should be subjected to sand blasting to reach the specified picture standard. Before sand blasting and rust removing, burrs, bulges and welding beading on the surface of the steel and welding seams are leveled and removed by using a grinding wheel.
2) The fireproof design tunnels of the tunnels in the region are classified into three types, and the fire resistance limit of a steel structure is not less than 2.00 h. Important components of the steel structure should be protected from fire by adopting fire-retardant coating. The selection of the type and the thickness of the steel structure fireproof coating and the spraying construction are strictly executed according to the technical specification of the steel structure fireproof coating application. The spraying construction sequence of the steel structure fireproof paint is primer, 2 intermediate paints, fireproof paint and finish paint.
3) The technical indexes of the spray polyurea elastomer are shown in the table 2.
TABLE 2 technical indices of spray polyurea elastomers
11. Chemical anchor bolt installation
Firstly, drilling a drill Hole (HD) by an electric hammer; secondly, manually cleaning holes (CAC); preparing an injection system; fourthly, the glue injection method is suitable for the installation of the drilling depth and the top of the other head or the embedding depth h is more than 250 mm; installing an anchoring piece (observing initial setting time) and installing the anchoring piece at the top of the head; sixthly, removing the redundant adhesive after the final setting time is reached, installing a nut and a gasket, and applying an installation torque; and installing a second nut and a gasket, applying a torque T, and bearing an external load after the torque is installed.
While the present invention has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments can be changed without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variation ranges of the present invention, and will not be described in detail herein.
Claims (8)
1. The steel lining reinforcing method is characterized by comprising the following steps:
s1: early preparation, which comprises the steps of pipeline rearrangement, removal of a road plate and temporary laying of a power circuit;
s2: treating the water leakage of the tunnel, including polyurethane grouting behind the wall and leakage treatment of the annular longitudinal seam;
s3: performing crack treatment, namely grouting and reinforcing cracks outside a steel ring reinforcing area, and then pasting aramid fabric, wherein the cracks in the steel ring reinforcing area are reinforced by adopting a steel ring;
s4: pre-treating segments in the tunnel, namely plugging annular and longitudinal joints of the segments by adopting epoxy resin and epoxy cement, and performing alternate construction on the segment pre-treatment and the pipeline rearrangement;
s5: mounting a steel ring lining, which comprises sequentially mounting a bottom plate, a side plate and a top plate, assembling and welding the bottom plate, the side plate and the top plate to manufacture a steel ring, and performing pressure injection of epoxy resin;
s6: and finally, recovering the pipeline and the walkway bed.
2. The steel lining reinforcing method according to claim 1, wherein before the steel ring is installed, real-scene data is generated by three-dimensional laser scanning, steel plate blanking numbering is performed on positions needing to be reinforced one by one according to the real-scene data, and before construction, lofting is performed on each steel plate in advance to ensure that the joint gap between the steel plate and the tunnel wall is minimum.
3. The method of claim 1, wherein in step S4, the cross-shaped seam of the tubular piece is cleaned and filled with epoxy resin, and if the hole is broken and loosened, the broken part is removed and then repaired with quick-setting cement.
4. The steel lining reinforcement method of claim 1, wherein the steel ring has a width of 1200mm and a thickness of 30mm, and comprises 2 bottom plates, 2 side plates, and 1 top plate, wherein the arc length of the bottom plate is 1.8m, and the arc length of the side plates and the top plate is 3.2 m.
5. The method for reinforcing a steel liner according to claim 4, wherein in step S3, the bottom steel plates at both sides are measured, the side plates are assembled from the annular steel plates at both sides, and the top annular plate is finally installed, wherein the steel plates are fixed by concrete-cracking type M16/8.8 grade special inverted-hammer-shaped chemical anchors, and each steel plate is fixed by expanded-bottom type anchors at the four corners and the middle part first and then is permanently fixed by chemical anchors manually.
6. The steel liner reinforcement method of claim 1, wherein the assembling of the steel ring liner comprises: the method comprises the following steps that a duct piece is fixedly locked with a manipulator clamp, the angles of a telescopic arm, a second arm and a small arm are adjusted, a locking device of a manipulator is connected with a connecting plate fixing pin of the duct piece, the angles of the telescopic arm and the second arm are adjusted to lift the duct piece, a positioning arc of the locking device is tightly contacted with the connecting plate fixing pin, and the mechanical locking device and the connecting plate are fixed and locked;
the manipulator moves towards the upper part of the tunnel, the middle upper part of the steel pipe sheet is jacked to be close to the tunnel wall, and expansion bolts of all bolt holes in the middle upper part of the steel pipe sheet are installed at the same time;
and after all the expansion bolts are installed, loosening the jacking oil cylinders on the side edges of the assembling machine to enable the devices of all the oil cylinders of the assembling machine to return to the positions before the steel pipe sheet is installed, completing the installation of the steel pipe sheet, and performing preparation work before the installation of the next steel pipe sheet.
7. The method for reinforcing a steel lining according to claim 1, wherein groove welding is used for all the steel plates in the steel ring during construction, and the height of the weld is the same as the thickness of the plate.
8. The steel lining reinforcement method of claim 1, wherein in steps S3-S6, epoxy resin pressure injection filling between the annular steel plate and the segment is performed immediately after the installation of the annular steel ring, and the average gap is controlled to be not more than 1.5 cm.
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| CN202210209168.8A CN114382505A (en) | 2022-03-04 | 2022-03-04 | Steel lining reinforcing method |
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Cited By (2)
| 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 |
| CN115573309A (en) * | 2022-09-21 | 2023-01-06 | 广东省水利电力勘测设计研究院有限公司 | Protection framework for improving safety performance of diversion tunnel structure |
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2022
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Cited By (2)
| 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 |
| CN115573309A (en) * | 2022-09-21 | 2023-01-06 | 广东省水利电力勘测设计研究院有限公司 | Protection framework for improving safety performance of diversion tunnel structure |
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