CN111254772A - Large cantilever structure suitable for widening old roads of cliff road sections and construction method - Google Patents
Large cantilever structure suitable for widening old roads of cliff road sections and construction method Download PDFInfo
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- CN111254772A CN111254772A CN202010240727.2A CN202010240727A CN111254772A CN 111254772 A CN111254772 A CN 111254772A CN 202010240727 A CN202010240727 A CN 202010240727A CN 111254772 A CN111254772 A CN 111254772A
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- 238000010276 construction Methods 0.000 title claims abstract description 45
- 239000004567 concrete Substances 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 239000010426 asphalt Substances 0.000 claims description 11
- 238000003466 welding Methods 0.000 claims description 10
- 238000009412 basement excavation Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000011083 cement mortar Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 8
- 238000012423 maintenance Methods 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/0401—Gullies for use in roads or pavements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
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- Bridges Or Land Bridges (AREA)
Abstract
A large cantilever structure suitable for widening an old road on a cliff road section comprises the old road, a cliff on a lower slope and a cliff on an upper slope, wherein the cliff on the lower slope and the cliff on the upper slope are respectively positioned on two sides of the old road; the anti-pulling road comprises an old road, and is characterized in that a strip-shaped foundation, an anti-pulling pile and a pile cap are arranged on the old road, the strip-shaped foundation is arranged close to a cliff on a lower slope, the strip-shaped foundation is arranged along the length direction of the old road, the anti-pulling pile is arranged close to a cliff on an upper slope, and the pile cap is arranged on the anti-pulling pile; the prefabricated beam is arranged on the strip-shaped foundation and the pile cap, and the bottom part of the prefabricated beam is embedded in the old road; compared with the prior art, the construction method has the advantages of wide application range, safe construction, avoidance of potential safety hazards during construction, convenience and quickness in construction, high safety and reliability, smoothness in drainage, easiness in reaching and maintaining and whole-life design.
Description
Technical Field
The invention belongs to the technical field of road widening, and particularly relates to a large cantilever structure suitable for widening an old road of a cliff road section and a construction method.
Background
In mountain cliff road sections, old road widening projects often face two difficulties: the method is widened towards the inner side of the mountain, the mountain needs to be excavated in a large area, the high and steep side slope is seriously brushed, the environmental damage is large, and the construction risk is high; widening towards the outer side of the mountain, and the retaining wall or the pier cannot be built due to the steep terrain of the cliff. Therefore, for the cliff road section, the scheme of widening the old road by adopting a large cantilever structure is the most suitable scheme.
At present, the old road widening technology for the cliff road section in the mountainous area has the following defects:
1. the existing roadbed widening technology is not suitable for a cliff terrain road section due to terrain difference. For example, chinese patent nos. CN109989312A and CN105236872 are directed to slope terrain rather than cliff terrain, and no footings are left on the retaining wall in the cliff road section, so that construction is practically impossible.
2. The existing cantilever structure technology is complex in construction, high in construction risk and potential safety hazard. If chinese patent No. CN201962558U sets up reinforced concrete long post outside old road, because the pile foundation is close to face the sky face, hole collapse easily, the pile foundation can't be under construction. The cliff slope is provided with soil nails or anchor rods, construction workers need to construct the cliff, and potential safety hazards are large.
3. The existing cantilever structure technology has weak anti-overturning safety measures, and an anchor rod is adopted as an anti-overturning component. The anchor rod member is easy to corrode in soil, poor in durability, short in service life and low in safety. Once the anchor rod fails, the cantilever structure will overturn towards the cliff side with serious consequences.
4. The existing cantilever structure technology is inconvenient for bridge deck construction. The bridge deck mainly adopts a support cast-in-place structure or a precast slab splicing structure. The support needs to be erected in the process of casting the support in situ, and construction cannot be carried out on a cliff road section; the precast slab assembly structure has high requirements on construction precision, the precast slabs are various, the integrity of the bridge deck is poor, the later-stage diseases are more, and the maintenance is difficult.
5. The existing cantilever structure technology does not fully consider drainage measures, and water damage risks exist in the service life.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the large cantilever structure and the construction method which have the advantages of simple structure, convenience and quickness in construction, safe structure, environmental protection and low construction cost and are suitable for widening the old road of the cliff road section.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a large cantilever structure suitable for widening an old road on a cliff road section comprises the old road, a cliff on a lower slope and a cliff on an upper slope, wherein the cliff on the lower slope and the cliff on the upper slope are respectively positioned on two sides of the old road; the anti-pulling road comprises an old road, and is characterized in that a strip-shaped foundation, an anti-pulling pile and a pile cap are arranged on the old road, the strip-shaped foundation is arranged close to a cliff on a lower slope, the strip-shaped foundation is arranged along the length direction of the old road, the anti-pulling pile is arranged close to a cliff on an upper slope, and the pile cap is arranged on the anti-pulling pile; the prefabricated beam is arranged on the strip-shaped foundation and the pile cap, and the bottom part of the prefabricated beam is embedded in the old road; a bridge deck system is arranged on the adjacent prefabricated cross beams, and a drainage channel is formed between the bridge deck system and the old road; the bridge deck system comprises a compression-molded steel plate, welding nails, a concrete plate and an asphalt pavement layer.
As a preferable scheme of the invention, a drainage side ditch is arranged at the position of a toe of the upper slope cliff and is communicated with the drainage channel.
As a preferred scheme of the invention, the uplift piles are buried in the old road, the plurality of uplift piles are equidistantly arranged along the length direction of the old road, and the pile caps are correspondingly arranged on the uplift piles.
As a preferable scheme of the invention, the strip foundation is buried in the old road, and the top of the strip foundation is positioned below the road surface of the old road.
In a preferred embodiment of the present invention, the welding nails are vertically and fixedly disposed on the upper surface of the profiled steel sheet, the concrete slab is laid on the profiled steel sheet, and the asphalt pavement layer is laid on the concrete slab.
In a preferred embodiment of the present invention, a cliff side guardrail is disposed on the bridge deck system near a cliff of the lower slope, and a cliff side guardrail is disposed on the bridge deck system near a cliff of the upper slope.
A construction method of a large cantilever structure suitable for widening an old road of a cliff road section comprises the following steps:
step A: arranging uplift piles on the side of the old road close to the cliff of the upper slope, constructing the uplift piles by adopting manual hole digging piles, and arranging corresponding pile caps on the tops of the uplift piles;
and B: carrying out slotting construction on the side, close to the cliff side, of the old road, laying steel bars in the slotting of the old road, and pouring a strip foundation;
and C: excavating a notch on the old road, and cleaning the bottom of the notch formed by excavation, wherein the notch is positioned between the pile cap and the cliff on the lower slope;
step D: prefabricating and processing prefabricated beams in a factory, transporting the prefabricated beams to the site, paving a layer of cement mortar in a notch of an old road, inserting the bottoms of the prefabricated beams into the notch of the old road, and abutting the bottoms of the prefabricated beams against a strip foundation and a pile cap;
step E: temporarily connecting the prefabricated beam with the pile cap, and pouring concrete for rigid connection;
step F: constructing a bridge deck system between adjacent precast cross beams, arranging profiled steel plates on the adjacent precast cross beams, installing welding nails at the bottoms of the profiled steel plates, paving reinforcing steel bars on the profiled steel plates, integrally casting a concrete slab in situ, and paving an asphalt pavement layer on the top of the concrete slab after the concrete slab is cured;
step G: installing cliff side guardrails and cliff side guardrails on two sides of the bridge deck system in a pre-buried manner;
step H: and excavating at the foot of the cliff of the upper slope to form a drainage side ditch. As a preferable mode of the present invention, the method is described.
And step E, after the prefabricated beam is connected with the pile cap, backfilling the groove wall formed between the prefabricated beam and the groove opening with non-shrinkage gravel concrete.
And E, tensioning the prestressed steel beams of the prefabricated beam after the construction of the prefabricated beam is finished.
As a preferable scheme of the invention, a gap is formed between the bridge deck system and the old road pavement, the gap is a drainage channel, and the drainage channel is communicated with the drainage side ditch.
Compared with the prior art, the invention has the beneficial effects that:
1. the application range is wide.
The invention is suitable for steep slope sections and cliff road cliff sections. Particularly, the technical problems that retaining wall construction on the outer side of a mountain and slope construction on the inner side of the mountain cannot be implemented on a cliff road section.
2. The construction is safe, and potential safety hazards during construction are avoided.
The strip foundation is arranged on the side of the old road close to the cliff, so that the integral stress of the strip foundation can be ensured, the uneven settlement is avoided, and the hole collapse risk caused by the fact that the pile foundation is too close to the free face on the side of the cliff during pile foundation construction can be avoided.
According to all the construction steps, constructors operate on the old road without going down to the side wall of the cliff, so that the safety of the constructors is guaranteed, and potential safety hazards are avoided.
3. The construction is convenient and fast.
The bridge deck system adopts the technology of profiled steel sheets, a bracket does not need to be erected during construction, and the technical problem of difficulty in erecting the bracket on the side face of the cliff is solved. The bridge deck system adopts the construction of whole cast-in-place, avoids the prefabricated of small-size prefabricated plate construction, hoists the numerous and diverse problem for construction speed.
4. High safety and reliability
The invention adopts the uplift pile as an anti-overturning measure, and resists the overturning bending moment through the side friction resistance of the uplift pile and soil and the driven soil pressure at the pile side. The structure degree of safety is high, does not have the problem that the stock became invalid.
The bridge deck system is integrally cast in place, a plurality of large cantilever prefabricated beams and uplift piles are stressed jointly, and the integral anti-overturning capacity is strong.
The bridge deck system adopts the technology of the profiled steel sheet, the profiled steel sheet is used as the structural safety reserve and can participate in the stress of the bridge deck system, the strength of the bridge deck system is high, and the diseases in the later period are few.
5. Drainage is smooth and easy
The damage of mountain floods and water is a main factor influencing the safety of roads in mountain areas. The drainage channel is reserved under the bridge deck system, so that free drainage of the mountain torrents can be guaranteed, and natural disasters caused by water damage can be reduced.
6. Easy to reach, easy to maintain, and designed to have a full life
The highway maintenance personnel can conveniently get into drainage channel and maintain, overhaul, dredge work, make things convenient for the later stage maintenance, improve structure durability, extension structure life.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a bottom view of the present invention;
FIG. 4 is a schematic cross-sectional view of an old road;
FIG. 5 is a schematic cross-sectional view of a deck system;
reference numbers in the figures: the novel high-rise building block comprises an old road 101, a lower slope cliff 102, an upper slope cliff 103, a prefabricated beam 201, a strip foundation 202, uplift piles 203, pile caps 204, a bridge deck system 301, a cliff side guardrail 302, a cliff side guardrail 303, a drainage side ditch 304, a drainage channel 305, profiled steel plates 401, welding nails 402, concrete slabs 403 and an asphalt pavement layer 404.
Detailed Description
The following describes embodiments of the present invention in detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, a large overhanging structure suitable for widening an old road on an overhanging cliff road segment comprises an old road 101, a lower slope cliff 102 and an upper slope cliff 103, wherein the lower slope cliff 102 and the upper slope cliff 103 are respectively located on two sides of the old road 101, the old road 101 is provided with a strip foundation 202, an uplift pile 203 and a pile cap 204, the strip foundation 202 is arranged close to the lower slope cliff 102, the strip foundation 202 is arranged along the length direction of the old road 101, the length of the strip foundation 202 is consistent with the length of the old road to be widened, the uplift pile 203 is arranged close to the upper slope cliff 103, and the pile cap 204 is arranged on the uplift pile 203.
The prefabricated beam 201 is arranged on the old road 101, the prefabricated beam 201 is arranged on the strip-shaped foundation 202 and the pile cap 204, the prefabricated beam 201 is placed on the strip-shaped foundation 202 and the pile cap 204, the strip-shaped foundation 202 and the pile cap 204 are located at two ends of the strip-shaped foundation 202, and the bottom of the prefabricated beam 201 is partially embedded in the old road 101.
The number of the prefabricated cross beams 201 and the distance between the adjacent prefabricated cross beams 201 are set according to actual conditions, the prefabricated cross beams 201 are arranged along the width direction of an old road 101, the length of the prefabricated cross beams 201 is larger than the width of the old road, the prefabricated cross beams 201 partially extend to the outside of the old road to form a suspension structure, the old road is properly widened on the basis of the prefabricated cross beams 201, the length of the prefabricated cross beams 201 is designed according to actual requirements, a bridge deck system 301 is arranged on the prefabricated cross beams 201, a drainage channel 305 is formed between the bridge deck system 301 and the old road 101, the bridge deck system 301 forms a new widened road, and the bridge deck system 301 comprises a profiled steel plate 401, welding nails 402, concrete slabs 403 and an asphalt pavement layer 404.
A drain gutter 304 is provided at a toe position of the upper sloping cliff 103, the drain gutter 304 is communicated with the drain channel 305, and the drain gutter 304 is provided along the toe of the upper sloping cliff 103.
The uplift piles 203 are buried in the old road 101, the uplift piles 203 are arranged at equal intervals along the length direction of the old road 101, and the pile caps 204 are correspondingly arranged on the uplift piles 203.
The strip foundation 202 is buried in the old road 101, the top of the strip foundation 202 is located below the road surface of the old road 101, and the strip foundation 202 is of a reinforced concrete structure, so that the integral stress of the strip foundation 202 is guaranteed. A certain edge is reserved at a distance from the cliff on the strip foundation 202, so that the stress safety of the base of the strip foundation 202 is ensured.
The welding nails 402 are vertically and fixedly arranged on the upper surface of the profiled steel sheet 401, the concrete slab 403 is laid on the profiled steel sheet 401, the asphalt pavement layer 404 is laid on the concrete slab 403, the bridge deck system 301 adopts a profiled steel sheet 401 cast-in-place concrete structure, the profiled steel sheet 401 serves as a concrete pouring bottom die, the construction without a support can be realized, the technical problem that the support is difficult to erect at an empty position outside the cliff is solved, the concrete is integrally cast in place, the integral stress of the large cantilever structure is guaranteed, the anti-overturning capacity and the anti-seismic capacity are enhanced, and the structure safety is guaranteed.
A cliff side guardrail 302 is arranged at a position, close to a cliff 102 on a lower slope, of the bridge deck system 301, a cliff side guardrail 303 is arranged at a position, close to a cliff 103 on an upper slope, of the bridge deck system 301, and the cliff side guardrail 302 is a rigid guardrail to prevent a vehicle from rushing out of a cliff; the cliff side guardrail 303 adopts a rigid guardrail, increases the self weight of the cliff side with a large cantilever structure, improves the anti-overturning bending moment, also adopts a flexible guardrail, saves the construction cost and reduces the collision damage of accident vehicles.
A construction method of a large cantilever structure suitable for widening an old road of a cliff road section comprises the following steps:
step A: the uplift pile 203 is arranged on the side, close to the cliff 103 of the upper slope, of the old road 101, the uplift pile 203 is constructed by adopting a manual hole digging pile, and the corresponding pile cap 204 is arranged at the top of the uplift pile 203.
The uplift pile 203 is a pile formed by adopting a manual excavation method to form a hole, then a steel reinforcement cage is placed, concrete is poured, the construction of the manual excavation pile is convenient, the speed is high, and large-scale mechanical equipment is not needed, the excavation pile is stronger in anti-seismic capacity than a wooden pile and a concrete driven pile, the manufacturing cost is lower than that of a punching cone, a punching hole of a percussion drill, a drilling hole of a rotary drilling machine and sinking foundation saving, the pile cap 204 is welded at the foremost end of the uplift pile 203 and is installed on the uplift pile 203 during the sinking construction of the tubular pile to play a role in guiding and plugging, the pile body of the uplift pile 203 with the pile cap 204 enters a soil layer so as to avoid the damage of the pile head and the inclination (verticality control) of the pile body, and.
And B: slotting construction is carried out on the side, close to the cliff 102, of the old road 101, reinforcing steel bars are laid in the slots of the old road 101, pouring of the strip-shaped foundation 202 is carried out, the strip-shaped foundation 202 is of a reinforced concrete structure, and the integral stress of the strip-shaped foundation 202 is guaranteed. A certain edge is reserved at a distance from the cliff on the strip-shaped foundation 202, so that the stress safety of the foundation is guaranteed.
And C: and (3) excavating a notch on the old road 101, and cleaning the bottom of the notch formed by excavation, wherein the notch is positioned between the pile cap 204 and the lower slope cliff 102, and the width of the notch is not less than that of the prefabricated beam 201.
Step D: prefabricating the prefabricated beam 201 in a factory, transporting the prefabricated beam 201 to the site, paving a layer of cement mortar in the notch of the old road 101, enhancing the smoothness of the groove bottom and the cohesiveness with the prefabricated beam 201, inserting the bottom of the prefabricated beam 201 into the notch of the old road 101, and abutting against the bottom of the prefabricated beam 201 with the strip foundation 202 and the pile cap 204.
Step E: the prefabricated beam 201 and the pile cap 204 are temporarily connected, concrete is poured for rigid connection, after the prefabricated beam 201 and the pile cap 204 are connected, the groove wall formed between the prefabricated beam 201 and the groove opening is backfilled by shrinkage-free small stone concrete, an embedding mechanism is formed between the old road 101 and the prefabricated beam 201, the anti-overturning stability of the large cantilever prefabricated beam 201 is enhanced, and the prefabricated beam 201 is tensioned by prestressed steel beams.
Step F: the construction of the bridge deck system 301 is carried out between the adjacent precast transverse beams 201, profiled steel plates 401 are arranged on the adjacent precast transverse beams 201, welding nails 402 are installed at the bottoms of the profiled steel plates 401, reinforcing steel bars are laid on the profiled steel plates 401, concrete plates 403 are cast in situ integrally, and asphalt pavement layers 404 are laid on the tops of the concrete plates 403 after the concrete plates 403 are cured.
The profiled steel sheet 401 is used as a concrete pouring bottom die, so that support-free construction can be realized, the technical problem that supports are difficult to erect at an empty position outside a cliff is solved, concrete is integrally cast in situ, the integral stress of a large cantilever structure is guaranteed, the anti-overturning capacity and the anti-seismic capacity are enhanced, and the structure safety is guaranteed.
The weld studs 402 are welded to the profiled steel sheet 401 to ensure that the profiled steel sheet 401 works with the integral cast in place concrete slab 403. And paving asphalt pavement 404 on the whole cast-in-place concrete slab 403 to serve as a traveling road surface.
Step G: cliff side guardrails 302 and cliff side guardrails 303 are embedded and installed on two sides of the bridge deck system 301.
Step H: and a drainage side ditch is formed by excavating at the foot of the cliff 103 of the upper slope, so that the cliff 103 of the upper slope is prevented from being washed by rainwater. During flood mountains, flood drainage can be performed through the drainage gutter 304 and the drainage channel 305 between the pavement of the old road 101 and the bridge deck 301. The upper slope cliff 103 and the bridge deck system 301 keep a proper horizontal distance, can be used as a tensioning space of the prefabricated beam 201 and a channel for maintenance and overhaul of highway maintenance personnel, and can prevent cliff rolling stones from falling to damage the bridge deck system 301 and running vehicles.
A gap is formed between the bridge deck 301 and the road surface of the old road 101, the gap is a drainage channel 305, and the drainage channel 305 is communicated with the drainage side ditch.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention; thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the reference numerals in the figures are used more here: old road 101, lower slope cliff 102, upper slope cliff 103, precast beam 201, strip foundation 202, uplift pile 203, pile cap 204, bridge deck 301, cliff side guardrail 302, cliff side guardrail 303, drainage side ditch 304, drainage channel 305, profiled steel sheet 401, welding nails 402, concrete slab 403, asphalt pavement 404 and other terms, but the possibility of using other terms is not excluded; these terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
Claims (10)
1. A large cantilever structure suitable for widening an old road on a cliff road section comprises an old road (101), a lower slope cliff (102) and an upper slope cliff (103), wherein the lower slope cliff (102) and the upper slope cliff (103) are respectively positioned on two sides of the old road (101); the anti-pulling device is characterized in that a strip-shaped foundation (202), an anti-pulling pile (203) and a pile cap (204) are arranged on the old road (101), the strip-shaped foundation (202) is arranged close to a lower slope cliff (102), the strip-shaped foundation (202) is arranged along the length direction of the old road (101), the anti-pulling pile (203) is arranged close to an upper slope cliff (103), and the pile cap (204) is arranged on the anti-pulling pile (203); the prefabricated beam (201) is arranged on the old road (101), the prefabricated beam (201) is arranged on the strip-shaped foundation (202) and the pile cap (204), and the bottom part of the prefabricated beam (201) is embedded in the old road (101); a bridge deck system (301) is arranged on the adjacent prefabricated cross beams (201), and a drainage channel (305) is formed between the bridge deck system (301) and the old road (101); the bridge deck system (301) comprises profiled steel plates (401), welding nails (402), concrete plates (403) and an asphalt pavement layer (404).
2. A large cantilever structure adapted to widen an old road on a cliff road section according to claim 1, wherein a drain gutter (304) is provided at a toe position of the upper slope cliff (103), the drain gutter (304) communicating with the drain channel (305).
3. The large cantilever structure suitable for widening an old road on a cliff road section as claimed in claim 1, wherein the uplift piles (203) are buried in the old road (101), the plurality of uplift piles (203) are arranged at equal intervals along the length direction of the old road (101), and pile caps (204) are correspondingly arranged on the uplift piles (203).
4. The large cantilever structure for widening the old road of the cliff road section as claimed in claim 1, wherein the strip foundation (202) is buried in the old road (101), and the top of the strip foundation (202) is located below the road surface of the old road (101).
5. The large cantilever structure for widening the old road on the cliff road section is characterized in that the welding nails (402) are vertically and fixedly arranged on the upper surface of the profiled steel plate (401), the concrete slab (403) is laid on the profiled steel plate (401), and the asphalt pavement layer (404) is laid on the concrete slab (403).
6. A large cantilever structure suitable for widening an old road of a cliff road section according to claim 1, wherein a cliff side guard rail (302) is arranged on the bridge deck system (301) near the lower slope cliff (102), and a cliff side guard rail (303) is arranged on the bridge deck system (301) near the upper slope cliff (103).
7. A construction method of a large cantilever structure suitable for widening an old road of a cliff road section is characterized by comprising the following steps:
step A: arranging uplift piles (203) on the side, close to an upper slope cliff (103), of the old road (101), constructing the uplift piles (203) by adopting manual hole digging piles, and arranging corresponding pile caps (204) at the tops of the uplift piles (203);
and B: grooving construction is carried out on the side, close to the cliff (102) of the lower slope, of the old road (101), reinforcing steel bars are laid in the grooves of the old road (101), and pouring of the strip foundation (202) is carried out;
and C: excavating a notch on the old road (101), and cleaning the bottom of the notch formed by excavation, wherein the notch is positioned between the pile cap (204) and the cliff (102) on the lower slope;
step D: prefabricating and processing a prefabricated beam (201) in a factory, transporting the prefabricated beam (201) to the site, paving a layer of cement mortar in a notch of an old road (101), inserting the bottom of the prefabricated beam (201) into the notch of the old road (101), and abutting the bottom of the prefabricated beam (201) against a strip foundation (202) and a pile cap (204);
step E: firstly, temporarily connecting a prefabricated beam (201) with a pile cap (204), and then pouring concrete for rigid connection;
step F: constructing a bridge deck system (301) between adjacent precast cross beams (201), arranging profiled steel plates (401) on the adjacent precast cross beams (201), installing welding nails (402) at the bottoms of the profiled steel plates (401), paving reinforcing steel bars on the profiled steel plates (401), integrally casting a concrete plate (403) in place, and paving an asphalt pavement layer (404) on the top of the concrete plate (403) after the concrete plate (403) is cured;
step G: a cliff side guardrail (302) and a cliff side guardrail (303) are pre-buried and installed on two sides of the bridge deck system (301);
step H: and a drainage side ditch (304) is formed by excavating at the slope foot of the cliff (103) of the upper slope.
8. The construction method of the large cantilever structure suitable for widening the old road of the cliff road section is characterized in that the width of the notch of the old road (101) in the step C is not less than that of the prefabricated cross beam (201), and the groove wall formed between the prefabricated cross beam (201) and the notch is backfilled with non-shrinkage small stone concrete in the step E after the prefabricated cross beam (201) is connected with the pile cap (204).
9. The construction method of the large cantilever structure suitable for widening the old road of the cliff road section according to the claim 7, wherein the step E is to perform prestress steel beam tensioning on the prefabricated beam (201) after the prefabricated beam (201) is constructed.
10. The construction method of the large cantilever structure suitable for widening the old road of the cliff road section is characterized in that a gap is formed between the bridge deck system (301) and the road surface of the old road (101), the gap is a drainage channel (305), and the drainage channel (305) is communicated with the drainage side ditch (304).
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