CN110983891B - Highway reconstruction and expansion assembly type roadbed structure and construction method thereof - Google Patents
Highway reconstruction and expansion assembly type roadbed structure and construction method thereof Download PDFInfo
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- CN110983891B CN110983891B CN201911360664.8A CN201911360664A CN110983891B CN 110983891 B CN110983891 B CN 110983891B CN 201911360664 A CN201911360664 A CN 201911360664A CN 110983891 B CN110983891 B CN 110983891B
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- 238000010276 construction Methods 0.000 title claims abstract description 26
- 239000002131 composite material Substances 0.000 claims abstract description 5
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 70
- 239000010959 steel Substances 0.000 claims description 70
- 239000002689 soil Substances 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000005452 bending Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material 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
- E01D18/00—Bridges specially adapted for particular applications or functions not provided for elsewhere, e.g. aqueducts, bridges for supporting pipe-lines
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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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
- E02D27/32—Foundations for special purposes
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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
- E02D5/52—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments
- E02D5/523—Piles composed of separable parts, e.g. telescopic tubes ; Piles composed of segments composed of segments
- E02D5/526—Connection means between pile segments
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a highway reconstruction and expansion fabricated roadbed structure and a construction method thereof.A vertical row of pile bodies are embedded along the roadbed expansion direction, the lower ends of the row of pile bodies extend into a foundation, the row of pile bodies comprise first pile bodies, the first pile bodies are arranged below the shoulder of an original embankment, one side of the first pile bodies, which is close to the roadbed expansion direction, is at least embedded with a group of second pile bodies, the first pile bodies and the second pile bodies have the same structure and respectively comprise prefabricated circular pipe piles, a composite mortar layer is arranged outside the prefabricated circular pipe piles, the top of the first pile bodies is provided with a pad beam, the top of the pad beam and the top of the second pile bodies are positioned at the same horizontal height, the upper surface of the pad beam and the upper surface of the second pile bodies are paved with cover beams, the top of the cover beams is connected with a hollow bridge deck through a bolt sleeve structure, and the top of the bridge deck is provided with a widened pavement. The invention reduces the dead weight of the upper structure, occupies small area, saves land resources, is convenient for assembly, structuralization and industrial production, reduces the technical difficulty of the field, and has the advantages of environmental protection and low cost.
Description
Technical Field
The invention belongs to the technical field of building structures, and relates to a highway reconstruction and expansion assembly type roadbed structure and a construction method thereof.
Background
With the rapid development of economy, the traffic capacity of part of the existing highways, particularly expressways, reaches or approaches the saturation amount of route operation, and the reconstruction and expansion of the expressways at early stage are imperative, wherein the roadbed widening is the main content of the reconstruction and expansion project; the traditional soil roadbed is widened to dig out part of the side slope of the old roadbed to fill soil, the roadbed is built into a step shape, the joint of the new roadbed and the old roadbed is reinforced through dynamic compaction or reinforcement treatment, then the new roadbed is paved and compacted in a layered mode, and the road widening is realized through roadbed splicing.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: for a road section with a steep side slope of the roadbed, if a retaining wall is built and widened at a position close to a toe of the roadbed by adopting a traditional method, the height of the retaining wall can reach dozens of meters, a large area of land needs to be occupied, the retaining wall invades a river channel, and the retaining wall is in danger of land acquisition and removal pressure and change of the natural environment of the river channel and is not beneficial to environmental protection; the engineering quantity is huge, which causes a great deal of resource waste and consumption, and the soil-free use is even realized in certain areas; meanwhile, the assembly, the structure and the industrialization level are low, the construction period in the reconstruction and the expansion engineering of the highway is long, and the existing traffic is greatly influenced.
Disclosure of Invention
In order to solve the problems, the invention provides a highway reconstruction and expansion assembly type roadbed structure, which reduces the dead weight of an upper structure, has high connection strength and small occupied area, saves land resources and reduces the change and damage to the natural environment; the assembly, the structurization and the industrial production are convenient, the field technical difficulty is reduced, the environment is protected, the cost is low, and the problems in the prior art are solved.
The invention also aims to provide a construction method for reconstructing and expanding the fabricated roadbed structure of the highway.
The invention adopts the technical scheme that a highway reconstruction and expansion assembly type roadbed structure is characterized in that vertical row pile bodies are embedded along the roadbed expansion direction, the lower ends of the row pile bodies extend into a foundation, each row pile body comprises a first pile body, the first pile body is arranged below the road shoulder of an original embankment, one side, close to the roadbed expansion direction, of the first pile body is at least embedded with a group of second pile bodies, the first pile body and the second pile bodies are identical in structure and respectively comprise prefabricated circular pipe piles, a composite mortar layer is arranged outside the prefabricated circular pipe piles, each prefabricated circular pipe pile comprises a drill bit, a plurality of sectional pipes and a closed end, the upper ends of the drill bit and the sectional pipes are respectively provided with a step-shaped notch with a high inside and a low outside, the lower ends of the sectional pipes and the closed end are respectively provided with a step-shaped notch with a low inside and a high outside, the lower ends of the sectional pipes and the step-shaped notch at the lower ends of the closed end are respectively provided with an annular axial bulge, a plurality of axial anchoring steel bar frameworks are uniformly arranged in the axial protrusions, embedding grooves are formed in the positions, corresponding to the axial protrusions, of the upper ends of the drill bit and the branch pipes, preformed holes are uniformly formed in the embedding grooves, and the preformed holes correspond to the anchoring steel bar frameworks one by one; the top of the first pile body is provided with a pad beam, the top of the pad beam and the top of the second pile body are located at the same horizontal height, a cover beam is laid on the upper surface of the pad beam and the upper surface of the second pile body, the top of the cover beam is connected with a hollow bridge deck through a bolt sleeve structure, and the top of the bridge deck is provided with a widened road surface.
Furthermore, the top of the pad beam is provided with a first groove, the bottom of the pad beam is provided with a first convex part, a second groove at the top of the first pile body is embedded with the first convex part, the cross section of the cover beam is T-shaped, the bottom of the cover beam is provided with a T-shaped convex part, and the T-shaped convex part is embedded with the corresponding first groove at the top of the pad beam and the second groove at the top of the second pile body.
Further, the bridge deck is made of reinforced concrete and has a hollow box-shaped section, and the hollow box-shaped section is any one of a plate-type section, a separated double-box section, an integral closed box section or a semi-closed box section.
Further, the decking comprises a plurality of hollow box units, and the structure of every hollow box unit is the same, all includes hollow box, and the top both sides of hollow box outwards extend and form the flange board, and two adjacent flange boards are equipped with the L type incision of mutually supporting respectively, realize the connection between the decking through steel sheet staple bolt structure.
Furthermore, the L-shaped incisions of the two flange plates are provided with preformed holes, and the screw rods of the bolts penetrate through the preformed holes to connect the two flange plates.
Furthermore, the bolt sleeve structure comprises a circular steel column, a circular through hole is formed in the bottom of the bridge deck, the steel column penetrates through the circular through hole, a sleeve is fixed outside the steel column, the steel column is attached to the inside of the sleeve, and the size of the upper end of the sleeve is larger than the aperture of the circular through hole; sleeve and steel column contact department are equipped with the round hole, correspond the position on the steel column and also are equipped with the round hole, and the one end of embolium radially penetrates the round hole, and the other end of embolium stretches out the sleeve, and it has two embolias to alternate on the telescopic same diameter, and the embolium is along the equidistant setting of sleeve axial, and along sleeve circumference evenly distributed, stretches out that telescopic embolium and sleeve all arrange the circular region of pouring at bent cap top in, realize the decking through pouring and be connected with the bent cap.
Further, the shape of the sleeve inner hole is any one of a regular triangle, a square, a regular pentagon or a regular hexagon.
Furthermore, the outer edge of the bridge deck is provided with a protective guard, and pavement layers are paved on the original pavement and the widened pavement.
Furthermore, the depth of the first groove and the second groove is 4cm, and the width of the first groove and the second groove is 30 cm.
A construction method for reconstructing and expanding a fabricated roadbed structure of a highway specifically comprises the following steps:
s1, excavating a construction platform at the side to be widened of the original roadbed slope close to the original road shoulder;
s2, burying a vertical first pile body below the original road shoulder, and driving a vertical second pile body into the position of the slope toe along the road extension direction according to the designed interval; the first pile body and the second pile body are in sectional type and are composed of a drill bit, a plurality of sectional pipes and a closed end, the pile driver lifts the drill bit to form a hole, disturbance to a soil body is reduced, the problem that the overall stability of an original roadbed is affected due to uneven stress of a foundation is avoided, the sectional pipes are implanted in sequence, after the sectional pipes are embedded, the next sectional pipe is placed, and the closed end is placed after the appropriate height is reached;
s3, the top of the closed end of the first pile body is higher than the construction platform by a certain length, a pad beam is laid on the top end of the first pile body, a second groove in the top of the first pile body and a first convex part at the bottom of the pad beam are mutually embedded to form a unified whole, and the top of the second pile body and the top of the pad beam are positioned at the same horizontal height;
s4, hoisting the bent cap by the crane to enable the T-shaped convex part of the bent cap to be mutually embedded with the corresponding first groove at the top of the pad beam and the second groove at the top of the second pile body to form a unified whole;
s5, inserting a steel column into a circular through hole in the bottom of a bridge deck, sleeving a sleeve on the outer portion of the steel column, attaching the inner portion of the steel column into the sleeve, enabling the sleeve to be completely embedded with the steel column, enabling the circular hole in the sleeve to correspond to the circular hole in the steel column, fixing the upper end of the sleeve through a screw, enabling the sleeve to be fixedly connected with the steel column, enabling the size of the upper end of the sleeve to be larger than the aperture of the circular through hole, lifting the bridge deck by using a lifting machine, enabling the bottom of the sleeve to be embedded with a circular pouring area on the top of a cover beam, enabling the sleeve to be located in the center of the circular pouring area, enabling one end of a bolt pipe with equal length to penetrate into the circular holes in the sleeve and the steel column, enabling the other end of the bolt pipe to extend out of the sleeve, enabling the bolt pipe and the sleeve extending out of the sleeve to be located in the circular pouring area, constructing and pouring the circular pouring area, and completing connection between the bridge deck and the cover beam;
and S6, installing guard rails on the outer edges of the bridge deck plates, paving widened pavements on the top of the bridge deck plates, and paving pavement layers on the original pavements and the widened pavements.
The invention has the beneficial effects that:
1. the invention adopts the structures of the capping beam and the bridge deck, realizes the connection between the bridge deck and the capping beam through the bolt sleeve structure, decomposes, simplifies and assembles the complex structure, reduces the construction difficulty, and can reduce the dead weight of the upper structure and the influence of the upper load on the new and old roadbed compared with a single pile-plate structure. The load is borne by the row-connected pile bodies, the capping beams and the bridge decks, so that the barrier is effectively crossed, the occupied area is small, a large amount of soil is not required to be filled, the land resource is saved, the problems that the soil is difficult to fetch, invades and occupies the river channel, the engineering quantity is huge, the land can be fetched without land, the soil fetching cost is increased, even the soil is not fetched, the treatment and reclamation cost is high are solved, and the less soil, the soil-free performance, the high efficiency and the low price construction of the road are realized; meanwhile, small structures such as old roadbed side ditches, drainage ditches and culverts can be fully utilized in reconstruction and extension projects, and the method is a better choice for responding to practical challenges, responding to green development and practicing the concept of green highways.
2. According to the invention, the first pile body, the second pile body, the cover beam and the bridge deck can be prefabricated in a factory, the first pile body and the second pile body only need to be spliced by embedding the sectional pipes prefabricated in the factory, on-site welding is not needed, the connection between the sectional pipes is realized by matching the anchoring steel bar framework and the preformed hole, the sectional pipes are prefabricated in the factory, the strength of the pile body is ensured, and the technical difficulty of on-site construction is reduced; the bent cap passes through between bolt housing structure and the decking, all realizes effectual connection between the hollow box unit of decking, and joint strength is high, improves assembly, structurization, greenization, economy, the batch production in the road work progress, and the construction process is simple, and construction cycle shortens in a large number, reduces the influence of construction to highway operation period, and social is showing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an assembled highway rebuilding and expanding structure according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a longitudinal bolster in an embodiment of the present invention.
Fig. 3 is a schematic structural view of a precast pile according to an embodiment of the present invention.
Fig. 4 is a schematic view of the connection between the segmental pipes of the precast pile in the embodiment of the invention.
Fig. 5 is a schematic view of a closed end in an embodiment of the invention.
Fig. 6 is a schematic view of the structure of the cap beam in the embodiment of the invention.
Fig. 7 is a schematic structural diagram of a bridge deck in an embodiment of the invention.
FIG. 8 is a schematic view of the flange plate connection according to an embodiment of the present invention.
Figure 9 is a schematic view of the attachment of a capping beam to a deck slab in accordance with an embodiment of the present invention.
Fig. 10 is a schematic view of a bolt connection structure in the embodiment of the present invention.
Fig. 11 is a top view of a bolted connection in an embodiment of the invention.
In the figure, 1, a foundation, 2, an original embankment, 3, an original embankment side slope, 4, a capping beam, 4-1, a T-shaped convex part, 5, a bridge deck, 5-1, a circular through hole, 5-2, a hollow box body, 5-3, a flange plate, 5-4, a bolt, 6, a pavement paving layer, 7, a protective guard, 8, a first pile body, 9, a second pile body, 10, a pad beam, 10-1, a first groove, 10-2, a first convex part, 11, an original pavement, 12, a widened pavement, 13, a drill bit, 14, a sectional pipe, 15, a closed end, 15-1, a second groove, 16, a circular pouring area, 17, a sleeve, 18, a bolt pipe and 19 a steel column.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention discloses a highway reconstruction and expansion fabricated roadbed structure, as shown in figure 1, vertical row of pile bodies are embedded along the roadbed expansion direction, the lower ends of the row of pile bodies extend into a foundation 1, the row of pile bodies comprises first pile bodies 8, the first pile bodies 8 are arranged below the road shoulder of an original embankment 2, at least one group of second pile bodies 9 are embedded at one side of the first pile bodies 8 close to the roadbed expansion direction, a pad beam 10 is arranged at the top of each first pile body 8, the top of each pad beam 10 and the top of each second pile body 9 are at the same horizontal height, a cover beam 4 is laid on the upper surface of each pad beam 10 and the upper surface of a closed end 15 of each second pile body 9, the top of each cover beam 4 is connected with a hollow bridge deck 5 through a bolt sleeve structure, a widened pavement 12 is arranged at the top of the bridge deck 5, a protective guard 7 is arranged on the outer edge of the bridge deck 5, and an original pavement 11, the widened pavement 12 is paved with pavement layers 6 to form a widened road.
As shown in fig. 3-5, the first pile body 8 and the second pile body 9 have the same structure, and both comprise a prefabricated circular pipe pile, the diameter of the prefabricated circular pipe pile is 6cm, a composite mortar layer is arranged outside the prefabricated circular pipe pile, the thickness of the composite mortar layer is 3cm, the diameters of the first pile body 8 and the second pile body 9 are 12cm, and the pile length is 15 m; the prefabricated round tubular pile is composed of a drill bit 13, a plurality of sectional tubes 14 and a closed end 15, wherein the upper ends of the drill bit 13 and the sectional tubes 14 are respectively provided with a step-shaped notch with a high inside and a low outside, the lower ends of the sectional tubes 14 and the closed end 15 are respectively provided with a step-shaped notch with a low inside and a high outside, annular axial bulges are arranged at the lower parts in the step-shaped notches at the lower ends of the sectional tubes 14 and the closed end 15, a plurality of axial anchoring steel bar frameworks are uniformly arranged in the axial bulges, the upper ends of the drill bit 13 and the sectional tubes 14 are provided with embedded grooves corresponding to the axial bulges, preformed holes are uniformly arranged in the embedded grooves, through the radial position when caulking groove, arch can control the connection of subsection pipe 14, preformed hole and anchor steel reinforcement skeleton one-to-one, and adjacent preformed hole interval is 30cm, can accomplish each other gomphosis between the subsection pipe 14 very fast, forms prefabricated circular tubular pile fast, improves the installation effectiveness.
When the two sectional pipes 14 are assembled, the stepped cut with the high inside and the low outside at the upper end of the drill bit 13 is embedded with the stepped cut with the low inside and the high outside at the lower end of the sectional pipe 14, and the stepped cut with the high inside and the low outside at the upper ends of the drill bit 13 and the sectional pipe 14 are embedded with the stepped cut with the low inside and the high outside at the lower end of the sectional pipe 14 and the lower end of the closed end 15; the anchoring steel bar frameworks uniformly arranged at the upper ends of the drill bit 13 and the section pipe 14 are embedded with the preformed holes uniformly arranged at the lower ends of the section pipe 14 and the closed end 15. The hoisting machine hoists, and the splicing among the sectional pipes 14 can be completed by adjusting the positions of the sectional pipes 14, so that an integral pile body is formed, the assembling speed is high, and the connecting strength is high. The top of the closed end 15 is provided with a second groove 15-1, and the second groove 15-1 is embedded with the T-shaped section convex part of the cover beam 4 to form an integrated structure. The invention adopts two modes to fully ensure the effective and stable connection between the sectional pipes 14 of the precast pile, can realize full assembly, reduces the construction flow, shortens the construction period and is simple and convenient to construct.
Each sectional pipe 14 is 2m long, 40cm in inner diameter and 50cm in outer diameter, namely the pipe wall is 5cm thick, the length of the steel bar at the bulge is 50cm, the diameter of the anchoring steel bar framework is 3cm, and 6 steel bars are uniformly arranged along the circumference; the second groove 15-1 has a depth of 4cm, a width of 30cm and a length of 50 cm.
According to the invention, the first pile body 8 and the second pile body 9 only need to be embedded and spliced with the sectional pipes prefabricated in factories, on-site welding is not needed, the connection between the sectional pipes 14 is realized through the matching of the anchoring steel bar framework and the preformed holes, the sectional pipes 14 are prefabricated in factories, the assembly and the factory production are facilitated, and the on-site technical difficulty is reduced.
The original road surface width in the embodiment of the invention is 11.75m, the horizontal distance between the first pile body 8 closest to the old road surface and the old road shoulder is 0.8-1.2m, so that the pile bodies and the old road surface keep a certain distance to prevent the deformation and stability of the old road surface from being influenced by pile body construction, the horizontal distance between the prefabricated pipe pile and the first pile body 8 is 1.5m-2.5m, and if the distance is too small, the pile bodies are tightly arranged to influence the stability of the old road base; if the distance is too large, the structural strength of the reconstructed and expanded road surface is small, normal passing of the reconstructed and expanded road surface cannot be guaranteed, and the proper inter-pile spacing is selected according to the expansion width in the actual engineering and the geological condition of the roadbed.
As shown in fig. 2 and 6, a first groove 10-1 is formed in the top of a pad beam 10, a first convex portion 10-2 is formed in the bottom of the pad beam 10, a second groove 15-1 in the top of a first pile 8 and the first convex portion 10-2 are mutually embedded to form an integrated structure, a second groove 15-1 is formed in the top of a closed end 15 of a second pile 9, the cross section of a cover beam 4 is T-shaped, the T-shaped convex portion 4-1, the corresponding first groove 10-1 and the corresponding second groove 15-1 are mutually embedded to form an integrated structure, and the first groove 10-1 and the first convex portion 10-2 are mutually staggered to ensure the strength of the pad beam 10. The total width of the pad beam 10 is 1m, the length is 4m, the thickness is 8cm, the depth of the first groove 10-1 is 4cm, the length is 50cm, the width is 30cm, the thickness of the cover beam 4 is 20cm, the depth of the T-shaped convex part 4-1 is 4cm, the width is 30cm, the depth of the second groove 15-1 is 4cm, and the width is 30 cm; where length denotes a horizontal direction along the road extension, width denotes a horizontal direction perpendicular to the length direction, and depth denotes a vertical direction.
The pad beam 10, the first pile body 8 and the second pile body 9 jointly have the supporting function, the influence of upper load (pavement load and the bridge deck 5) on an old roadbed and a widened part is buffered, the force of the upper load is transmitted into the foundation 1, the influence of automobile load on the old roadbed is reduced, the slope collapse is prevented, and the uneven settlement in the reconstruction and expansion project is reduced; the pad beam 10 increases the contact area with the original embankment 2, and enhances the stability of the extension structure.
The bridge deck 5 directly bears the load of vehicle wheel pressure, and the bridge deck 5 is made of reinforced concrete and has a hollow box-shaped section, wherein the hollow box-shaped section is any one of a plate-type section, a split-type double-box section, an integral closed box section or a semi-closed box section. The semi-closed box has the best section effect because the semi-closed box can meet the requirements of certain bending resistance and torsional rigidity and has good wind resistance dynamic stability. The plate-type section building has the advantages of small height, simple structure and good wind resistance. The split double-box section is convenient to construct, has poor torsional rigidity of the whole section, and is rarely adopted in practical engineering. The section of the integral closed box has strong bending rigidity and torsional rigidity, but the construction difficulty is higher, the structure is heavy, and the influence on the old roadbed is larger; the bridge deck 5 with the hollow box-shaped section has high torsional rigidity and has a section efficiency index higher than that of a T-shaped sectionρMeanwhile, the areas of the top plate and the bottom plate are larger, so that the bending moment can be effectively born, and the requirement of reinforcement is met. In addition, when the road surface bears eccentric load, the torsional rigidity of the box-shaped section beam is high, and the internal force distribution is uniform; when the road surface is in a cantilever state, the static and dynamic stability is good, and the method is particularly beneficial to a large-span beam bridge constructed by the cantilever; the box-shaped section has good overall performance, so that more vehicles can be borne to pass through.
As shown in fig. 7-9, the bridge deck 5 is assembled by a plurality of hollow box-type units, each hollow box-type unit has the same structure and comprises a hollow box body 5-2, two sides of the top end of the hollow box body 5-2 extend outwards to form flange plates 5-3, and the flange plates 5-3 of two adjacent hollow box-type units are connected through a steel plate hoop structure, so that a semi-closed hollow cavity is formed between the two adjacent hollow box-type units; the two adjacent flange plates 5-3 are respectively provided with L-shaped notches which are matched with each other, the L-shaped notches of the two flange plates 5-3 are embedded, the effective connection between the bridge deck plates 5 is realized through a steel plate hoop structure, and the flange plates 5-3 are made of Q235 steel; the L-shaped notches of the two flange plates 5-3 are provided with reserved holes, and the screw rods of the bolts 5-4 penetrate through the reserved holes and then are connected with the two flange plates 5-3.
The height of the bridge deck plate 5 is 60cm, the width of the top of the bridge deck plate 5 along the extension direction is 4m, the width of the bottom of the bridge deck plate 5 along the extension direction is 2.5m, the length of an L-shaped cut of the flange plate 5-3 is 8cm, the thickness of the L-shaped cut of the flange plate 5-3 is 2.5cm, the thickness of a steel plate of the steel plate hoop structure is 5mm, and the steel plate is made of Q235 steel; the diameter of the prepared hole is 20cm, and the model of the bolt 5-4 is M16.
As shown in fig. 10-11, the bolt sleeve structure includes a circular steel column 19, a circular through hole 5-1 is formed at the bottom of the bridge deck 5, the steel column 19 passes through the circular through hole 5-1, a sleeve 17 is fixed outside the steel column 19, an inner hole of the sleeve 17 is in any one of a regular triangle, a square, a regular pentagon or a regular hexagon, the steel column 19 is attached inside the sleeve 17, the outer portion of the sleeve 17 is circular, the size of the upper end of the sleeve 17 is larger than the aperture of the circular through hole 5-1, the lower ends of the sleeve 17 and the steel column 19 pass through the circular through hole 5-1, a circular hole is formed at the contact position of the sleeve 17 and the steel column 19, a circular hole is also formed at the corresponding position on the steel column 19, one end of a bolt tube 18 radially penetrates through the circular hole, the other end of the bolt tube 18 extends out of the sleeve 17, two bolt tubes 18 are inserted on the same diameter of the sleeve 17, the bolt tubes 18 are arranged at equal intervals along the axial direction of the sleeve 17, The sleeves 17 are evenly distributed along the circumferential direction of the sleeves 17, the bolt pipes 18 extending out of the sleeves 17 and the sleeves 17 are arranged in the circular pouring area 16 at the top of the bent cap 4, and the bridge deck 5 is connected with the bent cap 4 through pouring. Adopt the bolt cover structure between decking 5 and the bent cap 4, realized being connected between decking 5 and the bent cap 4 assembledly, guarantee joint strength, improve the industrialization degree.
Inserting a steel column 19 into a circular through hole 5-1 at the bottom of a bridge deck 5, sleeving a sleeve 17, wherein the shape of an inner hole of the sleeve 17 is any one of a regular triangle, a square, a regular pentagon or a regular hexagon, the steel column 19 is attached to the interior of the sleeve 17, the sleeve 17 is perfectly embedded with the steel column 19, and six hole sites can be reserved at the same time; the upper end of the sleeve 17 is fixed through screws, so that the sleeve 17 is fixedly connected with the steel column 19, the size of the upper end of the sleeve 17 is larger than the aperture of the circular through hole 5-1, the bridge deck 5 is lifted by a crane, the bottom of the sleeve 17 is embedded with the circular pouring area 16, one end of a bolt pipe 18 with equal length penetrates through circular holes of the sleeve 17 and the steel column 19, the other end of the bolt pipe 18 extends out of the sleeve 17, the bolt pipe 18 and the sleeve 17 extending out of the sleeve 17 are both arranged in the circular pouring area 16 at the top of the cover beam 4, the circular pouring area 16 is constructed, and connection between the bridge deck 5 and the cover beam 4 is completed.
The sleeve 17 is a regular hexagon and can be perfectly embedded with the circular steel column 19, and six hole sites can be reserved for the bolt tube 18 to pass through. The length of the steel column 19 is 21cm, the diameter is 20cm, the thickness of the sleeve 17 is 5mm, the bolt pipes 18 are provided with 3 groups, the 3 groups of bolt pipes 18 are distributed at equal intervals along the axial direction, the bolt pipes 18 are Q235 steel bars, the length is 40cm, the diameter is 2cm, the depth of the circular pouring area 16 is 8cm, the diameter is 40cm, and three circular pouring areas 16 are arranged on the cover beam 4.
The invention adopts the structures of the capping beam 4 and the bridge deck 5, realizes the connection between the bridge deck 5 and the capping beam 4 through the bolt sleeve structure, decomposes, simplifies and assembles the complex structure, reduces the construction difficulty, and can reduce the dead weight of the upper structure and the influence of the upper load on the new and old roadbed compared with a single pile-plate structure.
The construction method for reconstructing and expanding the highway into the fabricated roadbed structure provided by the embodiment of the invention specifically comprises the following steps:
s1, excavating a construction platform at the position, close to the road shoulder of the original embankment 2, of the side, to be widened, of the original roadbed slope 3;
s2, burying a vertical first pile body 8 under the shoulder of the original embankment 2, burying a vertical second pile body 9 at the position of a slope toe at one side of the first pile body 8 close to the roadbed extension direction according to a design interval, wherein the pile length of the second pile body 9 is determined according to upper load, geological conditions and the like; the first pile body 8 and the second pile body 9 are in sectional type and are composed of a drill bit 13, a plurality of sectional pipes 14 and a closed end 15, the drill bit 13 is lifted by a pile driver to form a hole, disturbance to a soil body is reduced, the problem that the overall stability of an original roadbed is affected due to uneven stress of the foundation 1 is avoided, the sectional pipes 14 are implanted in sequence, after the sectional pipes 14 are embedded, the next sectional pipe 14 is placed, and the closed end 15 is placed after the appropriate height is reached;
s3, the top of the closed end 15 of the first pile body 8 is higher than the construction platform by a certain length, a pad beam 10 is laid on the top end of the first pile body 8, and a second groove 15-1 on the top of the first pile body 8 and a first convex part 10-2 on the bottom of the pad beam 10 are mutually embedded to form a unified whole; the top of the closed end 15 of the second pile body 9 and the top of the pad beam 10 are positioned at the same horizontal height;
s4, hoisting the bent cap 4 by the crane, and enabling the T-shaped convex part 4-1 of the bent cap 4 to be mutually embedded with the corresponding first groove 10-1 at the top of the pad beam 10 and the corresponding second groove 15-1 at the top of the second pile body 9 to form a unified whole;
s5, inserting a steel column 19 into a circular through hole 5-1 at the bottom of a bridge deck 5, sleeving a sleeve 17 on the outer portion of the steel column 19, wherein the shape of an inner hole of the sleeve 17 is any one of regular triangle, square, regular pentagon or regular hexagon, the steel column 19 is attached to the sleeve 17, the sleeve 17 is perfectly embedded with the steel column 19, the circular hole on the sleeve 17 corresponds to the circular hole on the steel column 19, fixing the upper end of the sleeve 17 through a screw to fixedly connect the sleeve 17 with the steel column 19, the size of the upper end of the sleeve 17 is larger than the aperture of the circular through hole 5-1, lifting the bridge deck 5 by a crane, embedding the bottom of the sleeve 17 with a circular pouring area 16 at the top of a cover beam 4, the sleeve 17 is positioned at the center of the circular pouring area 16, one end of a bolt 18 with equal length penetrates through the circular holes of the sleeve 17 and the steel column 19, the other end of the bolt 18 extends out of the sleeve 17, the bolt 18 and the sleeve 17 extending out of the sleeve 17 are both arranged in the circular pouring area 16, constructing and pouring a circular pouring area 16 to complete the connection between the bridge deck 5 and the bent cap 4;
and S6, installing the protective guard 7 on the outer edge of the bridge deck 5, paving the widened pavement 12 on the bridge deck 5, and paving the pavement paving layer 6 on the original pavement 11 and the widened pavement 12 to form the widened road.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. An assembled roadbed structure for highway reconstruction and expansion is characterized in that vertical row-connected pile bodies are embedded along the roadbed expansion direction, the lower ends of the row-connected pile bodies extend into a foundation (1), the row-connected pile bodies comprise first pile bodies (8), the first pile bodies (8) are arranged below the road shoulder of an original embankment (2), one side, close to the roadbed expansion direction, of each first pile body (8) is at least embedded with a group of second pile bodies (9), the first pile bodies (8) and the second pile bodies (9) are of the same structure and respectively comprise prefabricated circular pipe piles, composite mortar layers are arranged outside the prefabricated circular pipe piles, the prefabricated circular pipe piles comprise a drill bit (13), a plurality of sectional pipes (14) and closed ends (15), the upper ends of the drill bit (13) and the sectional pipes (14) are respectively provided with step-shaped notches with inner heights and outer heights, and the lower ends of the sectional pipes (14) and the closed ends (15) are respectively provided with step-shaped notches with inner heights and outer heights, annular axial protrusions are arranged at the lower ends of the sectional pipes (14) and at the lower ends of the closed ends (15) at the lower parts in the stepped notches, a plurality of axial anchoring steel bar frameworks are uniformly arranged in the axial protrusions, embedding grooves are formed in the positions, corresponding to the axial protrusions, of the upper ends of the drill bits (13) and the sectional pipes (14), preformed holes are uniformly formed in the embedding grooves, and the preformed holes correspond to the anchoring steel bar frameworks one by one; the top of the first pile body (8) is provided with a pad beam (10), the top of the pad beam (10) and the top of the second pile body (9) are positioned at the same horizontal height, the upper surface of the pad beam (10) and the upper surface of the second pile body (9) are paved with a cover beam (4), the top of the cover beam (4) is connected with a hollow bridge deck (5) through a bolt sleeve structure, and the top of the bridge deck (5) is provided with a widened road surface (12);
the top of the pad beam (10) is provided with a first groove (10-1), the bottom of the pad beam (10) is provided with a first convex part (10-2), a second groove (15-1) at the top of the first pile body (8) is embedded with the first convex part (10-2), the cross section of the cover beam (4) is T-shaped, the bottom of the cover beam (4) is provided with the T-shaped convex part (4-1), and the T-shaped convex part (4-1) is embedded with the corresponding first groove (10-1) at the top of the pad beam (10) and the second groove (15-1) at the top of the second pile body (9);
the bolt sleeve structure comprises a circular steel column (19), a circular through hole (5-1) is formed in the bottom of the bridge deck (5), the steel column (19) penetrates through the circular through hole (5-1), a sleeve (17) is fixed to the outer portion of the steel column (19), the steel column (19) is attached to the inner portion of the sleeve (17), and the size of the upper end of the sleeve (17) is larger than the aperture of the circular through hole (5-1); the contact position of the sleeve (17) and the steel column (19) is provided with a round hole, the corresponding position on the steel column (19) is also provided with a round hole, one end of the bolt pipe (18) penetrates into the round hole along the radial direction, the other end of the bolt pipe (18) extends out of the sleeve (17), two bolt pipes (18) are inserted on the same diameter of the sleeve (17), the bolt pipes (18) are arranged at equal intervals along the axial direction of the sleeve (17) and are uniformly distributed along the circumferential direction of the sleeve (17), the bolt pipes (18) extending out of the sleeve (17) and the sleeve (17) are both arranged in a circular pouring area (16) at the top of the cover beam (4), and the bridge deck plate (5) is connected with the cover beam (4) through pouring;
the shape of the inner hole of the sleeve (17) is any one of a regular triangle, a square, a regular pentagon or a regular hexagon.
2. A highway rebuilding and expanding assembly type roadbed structure according to claim 1, wherein the bridge deck (5) is made of reinforced concrete and has a hollow box section, and the hollow box section is any one of a plate type section, a split type double box section, an integral closed box section or a semi-closed box section.
3. A highway reconstruction and extension assembly type roadbed structure according to claim 1, wherein the bridge deck (5) is assembled by a plurality of hollow box type units, each hollow box type unit has the same structure and comprises a hollow box body (5-2), two sides of the top end of each hollow box body (5-2) extend outwards to form flange plates (5-3), two adjacent flange plates (5-3) are respectively provided with L-shaped notches which are matched with each other, and the bridge deck (5) is connected through a steel plate hoop structure.
4. A highway reconstruction and extension assembled roadbed structure according to claim 3, wherein the L-shaped notches of the two flange plates (5-3) are provided with reserved holes, and the screw rods of the bolts (5-4) penetrate through the reserved holes to connect the two flange plates (5-3).
5. A highway reconstruction and extension assembly roadbed structure according to claim 1, wherein the outer edge of the bridge deck (5) is provided with a protective fence (7), and a pavement layer (6) is laid on the original pavement (11) and the widened pavement (12).
6. A road reconstruction and extension assembly-type roadbed structure according to claim 1, wherein the first groove (10-1) and the second groove (15-1) have a depth of 4cm and a width of 30 cm.
7. A construction method for reconstructing and extending an assembled roadbed structure of a highway, which is characterized in that the method for reconstructing and extending the assembled roadbed structure of the highway according to any one of claims 1 to 6 is adopted, and the method comprises the following steps:
s1, excavating a construction platform at the position, close to the shoulder of the original embankment (2), of the side, to be widened, of the original roadbed slope (3);
s2, burying a vertical first pile body (8) below a road shoulder of an original embankment (2), burying a vertical second pile body (9) at a slope toe position at one side of the first pile body (8) close to the roadbed extension direction according to a design interval, wherein the first pile body (8) and the second pile body (9) are in a sectional type and are composed of a drill bit (13), a plurality of sectional pipes (14) and a closed end (15), a pile driver lifts the drill bit (13) to form a hole, disturbance to a soil body is reduced, the problem that the overall stability of the original roadbed is affected due to uneven stress of a foundation (1) is avoided, the sectional pipes (14) are implanted in sequence, after the sectional pipes (14) are embedded, the next sectional pipe (14) is placed, and the closed end (15) is placed after the appropriate height is reached;
s3, the top of the closed end (15) of the first pile body (8) is higher than a construction platform by a certain length, a pad beam (10) is laid at the top end of the first pile body (8), a second groove (15-1) at the top of the first pile body (8) and a first convex part (10-2) at the bottom of the pad beam (10) are mutually embedded to form a unified whole, and the top of the second pile body (9) and the top of the pad beam (10) are positioned at the same horizontal height;
s4, the crane lifts the bent cap (4) to enable the T-shaped convex part (4-1) of the bent cap (4) to be mutually embedded with the corresponding first groove (10-1) at the top of the pad beam (10) and the second groove (15-1) at the top of the second pile body (9) to form a unified whole;
s5, inserting a steel column (19) into a circular through hole (5-1) at the bottom of a bridge deck (5), sleeving a sleeve (17) on the outer portion of the steel column (19), attaching the steel column (19) into the sleeve (17), perfectly embedding the sleeve (17) and the steel column (19), enabling a circular hole in the sleeve (17) to correspond to a circular hole in the steel column (19), fixing the upper end of the sleeve (17) through a screw to enable the sleeve (17) to be fixedly connected with the steel column (19), enabling the size of the upper end of the sleeve (17) to be larger than the aperture of the circular through hole (5-1), hoisting the bridge deck (5) by using a hoisting machine, enabling the bottom of the sleeve (17) to be embedded with a circular pouring area (16) at the top of a cover beam (4), enabling the sleeve (17) to be located at the center of the circular pouring area (16), enabling one end of a bolt pipe (18) with equal length to penetrate into the circular holes in the sleeve (17) and the steel column (19), and enabling the other end of the bolt pipe (18) to extend out of the sleeve (17), both the bolt pipe (18) extending out of the sleeve (17) and the sleeve (17) are arranged in the circular pouring area (16), and the circular pouring area (16) is constructed and poured to complete the connection between the bridge deck (5) and the cover beam (4);
s6, installing a protective guard (7) on the outer edge of the bridge deck (5), paving a widened pavement (12) on the top of the bridge deck (5), and paving pavement layers (6) on the original pavement (11) and the widened pavement (12).
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| CN112695656B (en) * | 2020-12-29 | 2022-07-12 | 广州地铁设计研究院股份有限公司 | Box culvert construction method for road widening and box culvert |
| CN113201986B (en) * | 2021-04-07 | 2022-12-02 | 安徽省交通规划设计研究总院股份有限公司 | Roadbed spliced wide portal retaining wall structure and construction method |
| ES2933104A1 (en) * | 2021-07-27 | 2023-02-01 | Sener Ing & Sist | Part for elevated transportation systems, method for constructing an elevated transportation system and use of said part to build an elevated transportation system (Machine-translation by Google Translate, not legally binding) |
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