CN112900294A - Lining structure for box culvert repair and construction method thereof - Google Patents
Lining structure for box culvert repair and construction method thereof Download PDFInfo
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- CN112900294A CN112900294A CN202110089596.7A CN202110089596A CN112900294A CN 112900294 A CN112900294 A CN 112900294A CN 202110089596 A CN202110089596 A CN 202110089596A CN 112900294 A CN112900294 A CN 112900294A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F5/00—Draining the sub-base, i.e. subgrade or ground-work, e.g. embankment of roads or of the ballastway of railways or draining-off road surface or ballastway drainage by trenches, culverts, or conduits or other specially adapted means
- E01F5/005—Culverts ; Head-structures for culverts, or for drainage-conduit outlets in slopes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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Abstract
The invention discloses a lining structure for box culvert repair and a construction method thereof, wherein the lining structure comprises stainless steel side plates connected with the side walls on two sides of a box culvert, a stainless steel top plate connected with the top wall of the box culvert and an inorganic anti-corrosion mortar layer covering the bottom plate of the box culvert; the two sides of the stainless steel top plate are provided with inner folded edges, and the inner folded edges can enable the stainless steel top plate to slide into a limited assembly position along the top ends of the stainless steel side plates on the two sides; the seam of the stainless steel top plate and the stainless steel side plate is fixed by spot welding; stainless steel anchoring steel plates are arranged on the outer sides of the stainless steel side plates and the stainless steel top plate, and the end parts of the stainless steel anchoring steel plates can abut against the inner wall of the box culvert so as to form a gap between the stainless steel plates and the inner wall of the box culvert; the stainless steel roof is provided with the observation pipe, and the interval of the top of observation pipe and box culvert roof is less than 1cm, and the observation pipe is provided with the valve. According to the lining structure for box culvert restoration, the stainless steel plate is used as the lining, so that the restored box culvert has small section loss and small flow resistance.
Description
Technical Field
The invention relates to the field of box culvert repair, in particular to a lining structure for box culvert repair and a construction method thereof.
Background
With the advance of urbanization, most of box culverts designed and constructed in early years are close to the design service life, and the construction mode of digging and repairing roads is more and more limited due to more and more underground pipelines and increasing traffic flow.
The novel technology and the novel process for repairing the stainless steel lining applied to the box culvert are firstly applied to the whole country to repair the full section of the box culvert in a large scale, and different from the prior winding method, the method has the advantages that the pipeline space is reduced after the repair, the method is not suitable for a square culvert and a spraying method, and the method cannot repair or enhance the strength of the supporting structure of the original culvert; the method is suitable for local repair, not only ensures that the conveying is not reduced and does not overflow through the modes of temporary water transfer and diving plugging dredging, but also creates conditions for directly entering the interior to carry out full-section repair, reduces the influence of reconstruction construction on road traffic and environment to the maximum extent, and ensures normal travel of residents along the line.
The stainless steel lining repairing process comprises the steps of firstly pumping sewage in a box culvert into a downstream through a temporary drainage system, pumping the sewage in the box culvert and dredging after temporary plugging is carried out on two ends of a box culvert repairing section, providing a dry land operation environment, then carrying out full-section repairing on an old box culvert by adopting a repairing scheme of reinforcing a top plate by using steel bars, three-surface (top plate and side wall) stainless steel linings and inorganic anti-corrosion mortar for a bottom plate, and finally dismantling and cleaning the two sections of temporary plugging after the repairing acceptance is qualified so as to recover water.
Disclosure of Invention
The invention aims to solve the technical problem of trenchless comprehensive repair of the full pipe section of the large-caliber square culvert box with serious corrosion and structural bearing capacity loss. The invention provides a lining structure for box culvert repair, which comprises stainless steel side plates connected with the side walls on two sides of a box culvert, a stainless steel top plate connected with the top wall of the box culvert and an inorganic anticorrosive mortar layer covering the bottom plate of the box culvert, wherein the stainless steel side plates are arranged on the side walls on two sides of the box culvert;
the two sides of the stainless steel top plate are provided with inner folded edges, and the inner folded edges can enable the stainless steel top plate to slide into a limited assembly position along the top ends of the stainless steel side plates on the two sides; the seam of the stainless steel top plate and the stainless steel side plate is fixed by spot welding;
stainless steel anchoring steel plates are arranged on the outer sides of the stainless steel side plates and the stainless steel top plate, and the end parts of the stainless steel anchoring steel plates can abut against the inner wall of the box culvert so as to form a gap between the stainless steel plates and the inner wall of the box culvert;
the bottom end of the stainless steel side plate is provided with a folded edge, the folded edge is provided with a horizontal section parallel to the box culvert bottom plate, and the horizontal section is fixed with the box culvert bottom plate through a stainless steel anchor bolt;
the inorganic anti-corrosion mortar layer of the bottom plate comprises a reinforcement mesh layer, and inorganic anti-corrosion mortar is poured on the reinforcement mesh layer;
the stainless steel roof is provided with the observation pipe, and the interval of the top of observation pipe and box culvert roof is less than 1cm, and the observation pipe is provided with the valve.
Further, the shape of the main body of the stainless steel roof is arched, and a stainless steel anchoring steel plate arranged at the highest position of the arched stainless steel roof can contact the top wall of the box culvert.
Furthermore, the stainless steel anchoring steel plate is in a concave shape, and the short edge of one end of the stainless steel anchoring steel plate is fixed on the stainless steel plate and is uniformly distributed on the outer side surface of the stainless steel plate.
Further, a plurality of inside lining structures are established ties in proper order along the box culvert length direction, and the stainless steel curb plate that is located the correspondence of box culvert both sides is set up to parallel arrangement, and the stainless steel roof is set up to be connected with adjacent stainless steel curb plate simultaneously.
The invention also provides a construction method of the lining structure, which comprises the following steps:
step one, construction preparation: arranging a temporary drainage system to communicate the upstream and downstream of a box culvert to be repaired, plugging the two ends of the box culvert to be repaired by plugs, arranging feeding ventilation shafts at intervals along the length direction of the box culvert to be repaired, allowing constructors to enter the box culvert to be repaired through the feeding ventilation shafts to carry out desilting, and arranging ventilation and illumination equipment;
step two, repairing the inner wall of the box culvert: firstly, chiseling the inner wall of a box culvert to be repaired; then planting bars on the top wall of the box culvert to be repaired, welding a reinforcing mesh, and spraying high-strength mortar; finally, repairing the expansion joint of the box culvert to be repaired;
step three, installing a stainless steel lining structure: firstly, installing a stainless steel side plate, propping against the side wall of the box culvert through a stainless steel anchoring steel plate on the outer side of the stainless steel side plate, and fixing a folded edge at the bottom end of the stainless steel side plate on a box culvert bottom plate through a stainless steel anchor bolt; then lifting the stainless steel top plate to the installation height through a jack, manually sliding the stainless steel top plate into a limited assembly position along the top end of the stainless steel, fixing a joint of the stainless steel top plate and the stainless steel side plate through electric welding, forming a hole in the stainless steel top plate, embedding a DN20 galvanized pipe as an observation pipe, and welding and fixing; finally, laying a reinforced mesh layer on the bottom plate of the box culvert to be repaired, and pouring inorganic anti-corrosion mortar on the reinforced mesh layer;
step four, formwork grouting: firstly, full-space supporting is carried out on a stainless steel top plate and stainless steel side plates, and then anticorrosive mortar is sequentially poured into gaps among the stainless steel side plates, the stainless steel top plate and the inner wall of the box culvert; finally, after the anti-corrosion mortar is cured to reach the strength, the full-hall type support is dismantled;
step five, detection test: and (4) after CCTV detection, carrying out closed water test detection on the repaired box culvert, and dismantling the temporary drainage system after the detection result is qualified.
Furthermore, in the second step, the high-strength mortar is silicate cement mortar, and the spraying thickness is more than or equal to 90 mm.
Further, in the third step, the installation height of the stainless steel side plate is controlled by an infrared level gauge, and a rubber pad with the thickness of 10mm is paved between the bottom end structure of the stainless steel side plate and the box culvert bottom plate.
Further, in step four, the stainless steel side plate is grouted first: plugging two end openings of a gap channel between a stainless steel side plate and a box culvert side wall by using anticorrosive mortar, forming a first height plugging wall and a first opening at two ends, wherein the first height is half of the height of the box culvert to be repaired, pouring the anticorrosive mortar into the first openings from two sides simultaneously, and stopping pouring when the pouring height of the anticorrosive mortar is flush with the first height; continuously plugging the first opening to form a second-height plugging wall, and then pouring the anti-corrosion mortar to a second height, wherein the second height is the height of the joint position of the stainless steel top plate and the stainless steel side plate;
grouting a stainless steel top plate: firstly, plugging axillary corners of openings at two ends of a gap channel between a stainless steel top plate and a box culvert top wall by using anti-corrosion mortar, forming second openings at two ends, pouring the anti-corrosion mortar into the second openings from two sides, and stopping pouring when the pouring height is flush with the axillary corners; and continuously plugging the second opening and embedding a DN50 sleeve as a grouting pipe, and then continuously pouring the anti-corrosion mortar until the observation pipe flows out the continuous anti-corrosion mortar without bubbles.
Further, in the fourth step, the grouting pressure is 0.5MPa-2 MPa.
The invention has the following beneficial effects:
1. according to the lining structure for box culvert restoration, the stainless steel plate is used as the lining, so that the restored box culvert has small section loss and small flow resistance.
2. The lining structure is easy to install and follow-up grouting, the grouted grouting layer and the stainless steel anchoring steel plate of the stainless steel plate form a structure similar to reinforced concrete, the strength of the lining structure is high, and the service life is long.
3. The construction method of the lining structure adopts graded grouting, so that grouting is more compact.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a lining structure for box culvert repair, which is disclosed by the invention.
Fig. 2 is a partial structural schematic view of a seam of a stainless steel top panel and a stainless steel side panel according to the present disclosure.
FIG. 3 is a schematic structural diagram of a reinforcing mesh layer of the inorganic anti-corrosion mortar for the soleplate of the invention.
Fig. 4 is a partially enlarged schematic view of the observation tube in fig. 1.
Fig. 5 is a schematic structural view of a stainless steel anchoring steel plate of the present invention.
FIG. 6 is a schematic plan-view expanded view of a plurality of liner structures in series in accordance with the present invention.
Fig. 7 is a schematic structural diagram of a construction environment of the lining structure for box culvert repair according to the present invention.
Fig. 8 is a schematic view of a grouting structure after the stainless steel side plate of the present invention is grouted for the first time.
Fig. 9 is a schematic view of a grouting structure after the stainless steel side plate of the present invention is grouted for the second time.
Fig. 10 is a schematic view of the present invention after grouting at the axillary corners of the stainless steel top plate.
Fig. 11 is a schematic structural view of the stainless steel roof panel of the present invention after grouting is completed.
In the figure, a stainless steel side plate 1, a folded edge 11, a stainless steel anchor bolt 12, a stainless steel top plate 2, an inner folded edge 21, an observation pipe 22, an inorganic anti-corrosion mortar layer 3, a reinforcing mesh layer 31, a stainless steel anchoring steel plate 4, an adjacent exhaust system 5, a feeding ventilation shaft 6, a plug 7, a first height blocking wall 8, a first opening 81, a second height blocking wall 9, an axillary corner 10, a second opening 11 and a DN50 sleeve 12.
Detailed Description
The invention is described in further detail below with reference to the data in conjunction with the figures. It should be understood that the embodiments are merely illustrative of the present invention and do not limit the scope of the invention in any way.
The box culvert to be repaired has the caliber of 2200 mm-2000 mm and the length of 480 m.
The two sides of the stainless steel roof in the invention refer to the two sides of the stainless steel roof close to the side wall of the box culvert,
the inner folded edge in the invention refers to the folded edge formed by bending two sides of the stainless steel top plate to the direction far away from the top wall of the box culvert,
defined assembly positions in the invention: when the stainless steel top plate is located at the limited assembly position, the inner folded edge covers the outer side surfaces of the tops of the stainless steel side plates at two sides, so that the stainless steel top plate cannot slide towards two sides of the stainless steel top plate after being assembled.
The outer sides of the stainless steel side plates and the stainless steel top plate in the invention refer to the sides of the stainless steel side plates and the stainless steel top plate close to the inner wall of the box culvert.
As shown in fig. 1, the invention provides a lining structure for box culvert repair, which comprises stainless steel side plates 1 connected with the side walls of two sides of a box culvert, a stainless steel top plate 2 connected with the top wall of the box culvert and an inorganic anti-corrosion mortar layer 3 covering the bottom plate of the box culvert, wherein the stainless steel side plates are arranged on the inner side of the box culvert; in this embodiment, a 6mm thick sheet of S316L stainless steel was used as the stainless steel sheet.
The two sides of the stainless steel top plate 2 are provided with inner folded edges 21, and the inner folded edges 21 can enable the stainless steel top plate 2 to slide into a limited assembly position along the top ends of the stainless steel side plates 1 on the two sides;
stainless steel anchoring steel plates 4 are arranged on the outer sides of the stainless steel side plates 1 and the stainless steel top plate 2, and the end parts of the stainless steel anchoring steel plates 4 can abut against the inner wall of the box culvert so as to form a gap between the stainless steel plates and the inner wall of the box culvert; the stainless steel anchoring steel plate 4 is used for determining the matching positions of the stainless steel top plate 2 and the stainless steel side plates 1 with the inner wall of the box culvert on the one hand, and can temporarily support the stainless steel plate before grouting on the other hand, and after grouting, a reinforced concrete connecting structure and connecting strength are formed between the stainless steel plate and the inner wall of the box culvert.
The bottom of stainless steel curb plate 1 has hem 11, and this hem 11 can make stainless steel curb plate 1 adapt to the change of each section size of box culvert better, need not to chisel into the perpendicular completely with the bottom of box culvert lateral wall promptly at the work progress, and hem 11 has the horizontal segment parallel with the box culvert bottom plate, and the horizontal segment passes through stainless steel crab-bolt 12 and box culvert bottom plate is fixed, and in this embodiment, stainless steel crab-bolt 12 adopts the specification to be M10 × 250, and the material is 304 stainless steel crab-bolt.
As shown in fig. 2, in this embodiment, the joints of the stainless steel top plate 2 and the stainless steel side plate 1 are hermetically fixed by spot welding; the seam between the stainless steel top plate 2 and the stainless steel side plate 1 is fixed by spot welding, so that the stainless steel top plate 2 and the stainless steel side plate 1 are connected with each other on the one hand, and the seam between the stainless steel top plate 2 and the stainless steel side plate 1 is sealed on the other hand.
As shown in fig. 3, the inorganic anti-corrosive mortar layer 3 of the base plate comprises a pre-arranged steel mesh layer 31, and the inorganic anti-corrosive mortar is poured on the steel mesh layer 31. Wherein, the inorganic anti-corrosion mortar layer 3 of the bottom plate can cover the stainless steel anchor bolt 12.
As shown in fig. 4, the highest arch of the stainless steel roof 2 is provided with an observation tube 22, the distance between the top end of the observation tube 22 and the top wall of the box culvert is less than 1cm, and the observation tube 22 is provided with a valve (not shown in the figure).
The observation tube 22 has the functions that on one hand, in the process of pouring the anti-corrosion mortar, the valve is always opened, so that air in the gap in the pouring process can completely flow out, and the compactness of the poured mortar is ensured; on the other hand, the observation hole is arranged in the center of the top plate, namely the distance between the observation pipe 22 and the bottom surface of the high-strength mortar of the top plate is not more than 1cm, the high-strength mortar is attached as much as possible, when the pouring liquid level of the anti-corrosion mortar of the top plate rises, the slurry which is continuous and does not have bubbles flows out from the observation hole, the fact that the pouring of the anti-corrosion mortar of the top plate is compact is indicated, and.
In this embodiment, the body of the stainless steel ceiling 2 is shaped like an arch, and the stainless steel anchor plate 4 provided at the highest position of the arched stainless steel ceiling 2 can contact the box culvert ceiling. Preferably, the highest position of the arch of the stainless steel roof 2 is 10cm higher than the lowest position. The stainless steel top plate 2 is arched, so that the section of the anti-corrosion mortar formed by subsequent pouring is also arched, and the arched structure can better bear soil pressure and upper load; on the other hand, the whole arch design can be better the former box culvert roof of laminating.
As shown in fig. 5, in this embodiment, the stainless steel anchor plate 4 has a concave shape, and the short side of one end thereof is fixed to the stainless steel plate and uniformly distributed on the outer surface of the stainless steel plate.
As shown in fig. 6, a plane development of a plurality of lining structures, in one embodiment, the lining structures are sequentially connected in series along the length direction of the box culvert, the corresponding stainless steel side plates 1 on both sides of the box culvert are arranged in parallel, and the stainless steel top plate 2 is arranged to be connected with the adjacent stainless steel side plates 1 at the same time, that is, the stainless steel top plate 2 and the stainless steel side plates 1 are connected in a staggered manner. Preferably, the stainless steel top plate 2 and the stainless steel side plate 1 have the same width, which refers to the length dimension of the stainless steel top plate 2 and the stainless steel side plate 1 along the longitudinal direction of the box culvert, and the length of the joint between the stainless steel top plate 2 and the adjacent stainless steel side plate 1 is the same. Namely, one half of the stainless steel top plate 2 is connected with one set of stainless steel side plates 1 arranged in parallel, and the other half of the stainless steel is connected with the other set of stainless steel side plates 1 arranged in parallel. The stainless steel top plate 2 and the stainless steel side plate 1 are connected in a staggered mode to enable welding seams to be staggered, so that the stress positions of the welding seams are not on the same straight line, and the overall strength is improved.
As shown in fig. 7, the invention also discloses a construction method of the lining structure, which comprises the following steps:
step one, construction preparation: arranging a temporary drainage system 5 to communicate the upstream and downstream of the box culvert to be repaired, plugging the two ends of the box culvert to be repaired by plugs 7, arranging feeding ventilation shafts 6 at intervals along the length direction of the box culvert to be repaired, allowing constructors to enter the box culvert to be repaired through the feeding ventilation shafts 6 for dredging, and arranging ventilation and illumination equipment; preferably, sluice wells are installed upstream and downstream of the culvert to be restored.
Step two, repairing the inner wall of the box culvert: firstly, chiseling the inner wall of a box culvert to be repaired; then planting bars on the top wall of the box culvert to be repaired, welding a reinforcing mesh, and finally spraying high-strength mortar; finally, repairing the expansion joint of the box culvert to be repaired; preferably, the high-strength mortar is silicate cement mortar, the spraying thickness is more than or equal to 90mm, the 24-hour compressive strength is more than or equal to 20Mpa, and the 28-day compressive strength is more than or equal to 35 Mpa; the flexural strength is more than or equal to 4Mpa in 24 hours, and the flexural strength is more than or equal to 6Mpa in 28 days; the later strength of the mortar is not obviously reduced; should have good bonding strength and be self-compacting.
Step three, installing a stainless steel lining structure: firstly, a stainless steel side plate 1 is installed, the installation height of the stainless steel side plate 1 is controlled through an infrared spirit level, the stainless steel anchoring steel plate 4 on the outer side of the stainless steel side plate is abutted against the side wall of the box culvert, and the horizontal section of a hem 11 at the bottom end of the stainless steel side plate 1 is fixed on a box culvert bottom plate through a stainless steel anchor bolt 12; then the stainless steel top plate 2 is lifted to the installation height through a jack, namely the top ends of the inner folded edge 21 of the stainless steel top plate 2 and the stainless steel side plate 1 are aligned, the stainless steel top plate 2 slides into a limited assembly position along the top ends of the stainless steel side plates 1 on two sides through manual work, the seam of the stainless steel top plate 2 and the stainless steel side plate 1 is fixed through electric welding, the welding seam adopts equal-strength full welding, is a three-level welding seam, and the welding process of argon protection is selected, and the width of the welding seam is not less than 3 mm; the stainless steel roof plate 2 is perforated and is embedded with a DN20 galvanized pipe as an observation pipe 22 and is welded and fixed, finally, a steel bar net layer 31 is laid on the bottom plate of the box culvert to be repaired, inorganic anti-corrosion mortar is poured on the steel bar net layer 31, preferably, in the third step, a rubber pad with the thickness of 10mm is laid between the horizontal section of the stainless steel side plate 1 and the bottom plate of the box culvert, and the pouring thickness of the inorganic anti-corrosion mortar layer 3 can cover the horizontal section of the stainless steel side plate 1.
Step four, formwork grouting: firstly, full-space supporting is carried out on a stainless steel top plate 2 and a stainless steel side plate 1, and then anticorrosive mortar is sequentially poured into gaps among the stainless steel side plate 1, the stainless steel top plate 2 and the inner wall of the box culvert; finally, after the anti-corrosion mortar is cured to reach the strength, the full-hall type support is dismantled; the anticorrosive mortar is Rje089 anticorrosive mortar sold by Shanghai pure and neat composite company Limited, and the initial setting time of the anticorrosive mortar is 6 hours. The grouting pressure is 0.5MPa-2 MPa. And (3) checking whether grouting is compact or not by adopting a rubber hammer to beat and listen to back while grouting.
In this embodiment, first, the stainless steel side plate 1 is grouted: as shown in fig. 8, the openings at two ends of the gap channel between the stainless steel side plate 1 and the box culvert side wall are blocked by the anti-corrosive mortar, and a first height blocking wall 8 and a first opening 81 are formed at two ends, the first height is half of the height of the box culvert to be repaired, the anti-corrosive mortar is poured into the first opening 81 from two sides at the same time, and the pouring height of the anti-corrosive mortar is aligned with the first height, and the pouring is stopped; preferably, the height of each occlusion is 1 m.
As shown in fig. 9, after 2 hours, continuously blocking the first opening 81 to form a second height blocking wall 9, and then pouring the anti-corrosion mortar to a second height, wherein the second height is the height of the joint position of the stainless steel top plate 2 and the stainless steel side plate 1;
stainless steel curb plate 1 pours into through the gradation, and both sides are poured into simultaneously and are made both sides anticorrosive mortar liquid level evenly promote to make both sides pressure keep unanimous, the grout is more closely knit, and corrosion resistant plate non-deformable.
After the stainless steel side plate 1 is filled for 2 hours, the stainless steel top plate 2 is filled with the grout: as shown in fig. 10, firstly, the axillary corners 10 of the gap channel between the stainless steel top plate 2 and the box culvert top wall, which are open at two ends, are blocked by the anti-corrosive mortar, second openings 11 are formed at two ends, the anti-corrosive mortar is poured into the second openings from two sides, and pouring is stopped when the pouring height is flush with the axillary corners 10;
after 2 hours, as shown in fig. 11, the second opening 11 is continuously plugged and the DN50 sleeve 12 is pre-buried, and then the anticorrosive mortar is continuously poured through the DN50 sleeve 12 until the observation tube 22 flows out continuous anticorrosive mortar without air bubbles. Grouting is stopped and the sight tube 22 valve is closed.
Step five, detection test: and (4) after CCTV detection, carrying out closed water test detection on the repaired box culvert, and dismantling the temporary drainage system 5 after the detection result is qualified. And (4) detecting the box culvert by using a CCTV pipeline detection robot.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. The lining structure for box culvert repair is characterized by comprising stainless steel side plates connected with the side walls on two sides of a box culvert, a stainless steel top plate connected with the top wall of the box culvert and an inorganic anti-corrosion mortar layer covering the bottom plate of the box culvert;
inner folded edges are arranged on two sides of the stainless steel top plate, and the inner folded edges can enable the stainless steel top plate to slide into a limited assembly position along the top ends of the stainless steel side plates on the two sides; the seam of the stainless steel top plate and the stainless steel side plate is fixed through spot welding;
stainless steel anchoring steel plates are arranged on the outer sides of the stainless steel side plates and the stainless steel top plate, and the end parts of the stainless steel anchoring steel plates can abut against the inner wall of the box culvert so as to form a gap between the stainless steel plates and the inner wall of the box culvert;
the bottom end of the stainless steel side plate is provided with a folded edge, the folded edge is provided with a horizontal section parallel to the box culvert bottom plate, and the horizontal section is fixed with the box culvert bottom plate through a stainless steel anchor bolt;
the inorganic anti-corrosion mortar layer of the bottom plate comprises a reinforcement mesh layer, and inorganic anti-corrosion mortar is poured on the reinforcement mesh layer;
the stainless steel roof plate is provided with an observation pipe, the distance between the top end of the observation pipe and the top wall of the box culvert is smaller than 1cm, and the observation pipe is provided with a valve.
2. The lining structure for box culvert restoration according to claim 1, wherein the body of the stainless steel roof plate is arch-shaped, and the stainless steel anchoring steel plate provided at the highest position of the arch-shaped stainless steel roof plate can contact the box culvert top wall.
3. The lining structure for box culvert restoration according to claim 1, wherein the stainless steel anchoring steel plate is in a concave shape, and the short side of one end of the stainless steel anchoring steel plate is fixed on the stainless steel plate and is uniformly distributed on the outer side surface of the stainless steel plate.
4. A lining structure for box culvert restoration according to claim 1, wherein a plurality of lining structures are sequentially connected in series along the length direction of the box culvert, the corresponding stainless steel side plates on both sides of the box culvert are arranged in parallel, and the stainless steel top plate is arranged to be simultaneously connected with the adjacent stainless steel side plates.
5. The method of constructing a lining structure as claimed in claim 1, comprising the steps of:
step one, construction preparation: arranging a temporary drainage system to communicate the upstream and downstream of a box culvert to be repaired, plugging the two ends of the box culvert to be repaired by plugs, arranging feeding ventilation shafts at intervals along the length direction of the box culvert to be repaired, allowing constructors to enter the box culvert to be repaired through the feeding ventilation shafts to carry out desilting, and arranging ventilation and illumination equipment;
step two, repairing the inner wall of the box culvert: firstly, chiseling the inner wall of a box culvert to be repaired; then planting bars on the top wall of the box culvert to be repaired, welding a reinforcing mesh, and spraying high-strength mortar; finally, repairing the expansion joint of the box culvert to be repaired;
step three, installing a stainless steel lining structure: firstly, installing a stainless steel side plate, propping against the side wall of the box culvert through a stainless steel anchoring steel plate on the outer side of the stainless steel side plate, and fixing a folded edge at the bottom end of the stainless steel side plate on a box culvert bottom plate through a stainless steel anchor bolt; then lifting the stainless steel top plate to the installation height through a jack, manually sliding the stainless steel top plate into a limited assembly position along the top end of the stainless steel, fixing a joint of the stainless steel top plate and the stainless steel side plate through electric welding, forming a hole in the stainless steel top plate, embedding a DN20 galvanized pipe as an observation pipe, and welding and fixing; finally, laying a reinforced mesh layer on the bottom plate of the box culvert to be repaired, and pouring inorganic anti-corrosion mortar on the reinforced mesh layer;
step four, formwork grouting: firstly, full-space supporting is carried out on a stainless steel top plate and stainless steel side plates, and then anticorrosive mortar is sequentially poured into gaps among the stainless steel side plates, the stainless steel top plate and the inner wall of the box culvert; finally, after the anti-corrosion mortar is cured to reach the strength, the full-hall type support is dismantled;
step five, detection test: and (4) after CCTV detection, carrying out closed water test detection on the repaired box culvert, and dismantling the temporary drainage system after the detection result is qualified.
6. The construction method according to claim 5, wherein in the second step, the high-strength mortar is silicate cement mortar, and the spraying thickness is greater than or equal to 90 mm.
7. The construction method according to claim 5, wherein in step three, the installation height of the stainless steel side plates is controlled by an infrared level gauge, and a rubber mat with the thickness of 10mm is laid between the bottom structures of the stainless steel side plates and the box culvert bottom plate.
8. The construction method according to claim 5, wherein in the fourth step, the stainless steel side plate is first grouted: plugging two end openings of a gap channel between a stainless steel side plate and a box culvert side wall by using anticorrosive mortar, forming a first height plugging wall and a first opening at two ends, wherein the first height is half of the height of the box culvert to be repaired, pouring the anticorrosive mortar into the first openings from two sides simultaneously, and stopping pouring when the pouring height of the anticorrosive mortar is flush with the first height; continuously plugging the first opening at intervals of 2 hours to form a second-height plugging wall, and then pouring the anti-corrosion mortar to a second height, wherein the second height is the height of the joint position of the stainless steel top plate and the stainless steel side plate;
after the stainless steel side plate is filled for 2 hours, the stainless steel top plate is filled with grout: firstly, plugging axillary corners of openings at two ends of a gap channel between a stainless steel top plate and a box culvert top wall by using anti-corrosion mortar, forming second openings at two ends, pouring the anti-corrosion mortar into the second openings from two sides, and stopping pouring when the pouring height is flush with the axillary corners; and continuously plugging the second opening at an interval of 2 hours, embedding a DN50 sleeve pipe as a grouting pipe, and continuously pouring the anti-corrosion mortar until the anti-corrosion mortar without bubbles continuously flows out of the observation pipe.
9. The construction method according to claim 8, wherein in the fourth step, the grouting pressure is 0.5MPa to 2 MPa.
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