CN112458818B - High-comfort assembly type cement concrete pavement repairing structure, construction method and pavement structure overturning device - Google Patents
High-comfort assembly type cement concrete pavement repairing structure, construction method and pavement structure overturning device Download PDFInfo
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- CN112458818B CN112458818B CN202011421736.8A CN202011421736A CN112458818B CN 112458818 B CN112458818 B CN 112458818B CN 202011421736 A CN202011421736 A CN 202011421736A CN 112458818 B CN112458818 B CN 112458818B
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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
- E01C5/00—Pavings made of prefabricated single units
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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
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
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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
- E01C5/00—Pavings made of prefabricated single units
- E01C5/06—Pavings made of prefabricated single units made of units with cement or like binders
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/147—Repairing concrete pavings, e.g. joining cracked road sections by dowels, applying a new concrete covering
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Abstract
本发明公开了高舒适性装配式水泥混凝土路面修复结构、施工方法及路面结构翻转装置，高舒适性装配式水泥混凝土路面修复结构，路面基层上铺装防水层，防水层上铺装沥青混凝土垫层，沥青混凝土垫层上安装装配式水泥混凝土板；装配式水泥混凝土板内设导管，导管内分设导线，导线之间采用电热丝连接，各电热丝采用并联方式与导线连接。本发明高舒适性装配式水泥混凝土路面修复结构、施工方法及路面结构翻转装置，同时满足施工快速化、机械化、工厂化的要求，构造一种装配式水泥混凝土路面修复结构，避免出现路面不良现象，在施工过程中能自动调整高度以及方便安装、拆卸，能够大幅度提高行车舒适性和路面结构的耐久性。
The invention discloses a high-comfort prefabricated cement concrete pavement repair structure, a construction method and a pavement structure overturning device, a high-comfort prefabricated cement concrete pavement repair structure, a waterproof layer is paved on the pavement base, and an asphalt concrete pad is paved on the waterproof layer. The prefabricated cement concrete slab is installed on the asphalt concrete cushion layer; the prefabricated cement concrete slab is provided with conduits, and the conduits are divided into conductors. The present invention provides a high-comfort prefabricated cement concrete pavement repair structure, a construction method and a pavement structure overturning device, and simultaneously meets the requirements of rapid construction, mechanization and industrialization, constructs a prefabricated cement concrete pavement repair structure, and avoids the occurrence of poor pavement phenomena. It can automatically adjust the height and facilitate installation and disassembly during the construction process, which can greatly improve the driving comfort and the durability of the pavement structure.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a high-comfort assembly type cement concrete pavement repairing structure, a construction method and a pavement structure overturning device.
Background
The asphalt concrete pavement is generally applied in the construction process of urban roads and highway engineering in China, occupies a considerable proportion in high-grade roads, is easy to have diseases such as rutting, pushing and crowding, cracking and the like in the use process, and seriously affects the driving comfort of the roads. In addition, compared with a cement concrete pavement, the asphalt concrete pavement also has the defects of high manufacturing cost, high maintenance cost and the like. In the maintenance process of the common cast-in-place concrete pavement, if on-site repair is needed, the pavement needs to be maintained for at least 7 days, and the smoothness of the pavement is seriously influenced. Because the assembly type cement concrete pavement structure can effectively solve the problems, the assembly type cement concrete pavement structure is widely used under certain specific working conditions.
Chinese patent CN201610173304.7 discloses an assembly type cement pavement construction method, wherein a leveling layer is arranged at the lower part of an assembly plate, and a starting point assembly plate, a middle assembly plate and an end assembly plate are sequentially laid at the upper part of the leveling layer; the joint of the assembling plate is respectively provided with a positive step interface and a negative step interface; arranging an anti-lateral-movement buttress and a displacement lateral-limiting pile connecting hole at the outer side end of the starting end assembling plate and the outer side end of the terminal end assembling plate; after the assembly plate is laid, driving displacement side limiting piles into a structural layer at the lower part of the road surface through displacement side limiting pile connecting holes; and finally, performing post-glue injection construction at the joint and installing a seam-blocking steel plate. This patent has carried out some engineering quests to assembled cement concrete pavement structure to corresponding prefabricated pavement structure has been proposed, but still has following several shortcomings: (1) the pavement structure has suitable working conditions, but in some special areas of the asphalt pavement structure, because of the influence of the phenomena of frequent start and stop of vehicles and overload and heavy load, the pavement structure is easy to have diseases such as rutting, moving, crowding, cracking and the like; (2) in the installation process of the assembly type cement pavement structure, the elevation of the pavement is adjusted by manually operating the vibrating machine, the uneven condition of the pavement is easy to occur, and meanwhile, only the installation of the assembly type cement concrete pavement structure is considered, and the removal of the assembly type cement concrete pavement structure is not considered, so that the pavement structure can be removed only through a large machine in the later period, the engineering construction cost is greatly increased, and the engineering progress is slowed down; (3) the surface of the fabricated cement pavement structure can be rough and uneven due to various reasons in the prefabricating process, the driving comfort of the road is seriously damaged, and the comfort of the fabricated cement concrete pavement can not be effectively guaranteed.
In conclusion, the problem of solving the problems of the asphalt concrete pavement, meeting the requirements of construction rapidity, mechanization and industrialization simultaneously, and combining the original asphalt concrete pavement and the fabricated cement concrete pavement to construct the fabricated cement concrete pavement repairing structure is the first problem worthy of research. The second problem to be studied is to construct a structure that can be automatically adjusted in height during construction and is easy to install and disassemble. The invention relates to a device for improving the comfort of a pavement structure, which is a third problem worthy of research. In view of this, there is a need for a high-comfort fabricated cement concrete pavement repair structure, a construction method and a construction device that can be quickly constructed, effectively prevent and treat diseases of asphalt pavement, and improve pavement performance.
Disclosure of Invention
In order to achieve the purpose, the invention provides a high-comfort assembly type cement concrete pavement repairing structure, a construction method and a pavement structure overturning device, which simultaneously meet the requirements of construction rapidity, mechanization and industrialization, combine the original asphalt concrete pavement and the assembly type cement concrete pavement, construct the assembly type cement concrete pavement repairing structure, can avoid the unfavorable phenomena of rutting, pushing embrace, cracking, local plastic deformation and the like of the asphalt concrete pavement structure, can automatically adjust the height in the construction process, is convenient to install and disassemble, can greatly improve the travelling comfort and the durability of the pavement structure, and solve the problems that the pavement structure is easy to be damaged, the pavement is easy to be uneven in the installation process, is difficult to disassemble, the pavement comfort is poor and the like in the prior art.
The technical scheme adopted by the invention is that a high-comfort fabricated cement concrete pavement restoration structure is characterized in that a waterproof layer is paved on a pavement base layer, an asphalt concrete cushion is paved on the waterproof layer, a fabricated cement concrete slab is installed on the asphalt concrete cushion, asphalt is injected into an expansion joint around the fabricated cement concrete slab, and the prefabricated fabricated cement concrete slab and the original asphalt concrete pavement around the fabricated cement concrete slab are connected into a whole;
two points at the midpoint of the top surface of the fabricated cement concrete slab are taken as starting points, two diagonal points of the bottom surface of the fabricated cement concrete slab are taken as finishing points, two guide pipes are correspondingly and reversely arranged, conducting wires are respectively arranged in the two guide pipes, the two conducting wires are connected by adopting electric heating wires, and the electric heating wires are connected with the conducting wires in a parallel connection mode and are used for heating and softening the asphalt concrete cushion layer contacted with the bottom surface of the fabricated cement concrete slab.
Furthermore, the fabricated cement concrete slab is a prefabricated product made of an upper part and a lower part which are made of different materials, the lower part is a steel fiber concrete layer, the upper part is a common concrete layer, a concrete retarder is sprayed on the surface of the common concrete layer on the upper part, and then an asphalt concrete surface layer is paved on the common concrete layer sprayed with the concrete retarder.
Furthermore, four prefabricated limiting piles are arranged at four corner positions corresponding to the positions of the assembled cement concrete slabs on the pavement base layer, and clamping teeth are arranged at the tops of the prefabricated limiting piles; the prefabricated spacing stake passes waterproof layer, asphalt concrete cushion, and the latch embedding that the prefabricated spacing stake top set up corresponds in the latch that sets up to assembled cement concrete slab for improve road surface basic unit and assembled cement concrete slab's combination stability.
Furthermore, a wire joint box is arranged at the midpoint of the top surface of the fabricated cement concrete slab, a metal cover plate is arranged at the upper end of the wire joint box, two prestressed reinforcements are symmetrically arranged in the fabricated cement concrete slab, and four reserved holes are symmetrically arranged above the two prestressed reinforcements and used for welding hoisting screws on the prestressed reinforcements through the reserved holes.
Further, the prefabricated cement concrete slab is a prefabricated product and is a poured concrete structure with a built-in reinforcing mesh; the built-in reinforcing mesh adopts longitudinal reinforcing steel bars and transverse reinforcing steel bars to form a mesh in an intersecting manner, corner reinforcing steel bars are bound at the four plate corners of the built-in reinforcing mesh, and the corner reinforcing steel bars comprise corner reinforcing distribution steel bars and corner reinforcing connecting steel bars.
Another object of the present invention is to provide a construction method of the above high-comfort fabricated cement concrete pavement repair structure, including the following steps:
step S1, pre-breaking the original asphalt concrete pavement, driving four prefabricated limiting piles into four corner positions corresponding to the positions of the cleaned pavement base and the assembled cement concrete slab, wherein the prefabricated limiting piles penetrate through the waterproof layer and the asphalt concrete cushion layer, and the tops of the prefabricated limiting piles are provided with latches for being embedded into the latches correspondingly arranged in the assembled cement concrete slab;
step S2, prefabricating the fabricated cement concrete slab: firstly, arranging a guide pipe at a designated position, binding a reinforcing mesh on a bottom die, fixing the guide pipe on the reinforcing mesh through a steel wire, inserting a guide wire into the guide pipe, binding corner reinforcing steel bars on four corners of the prefabricated assembly type cement concrete slab reinforcing mesh, symmetrically arranging prestressed steel bars in the assembly type cement concrete slab along the transverse direction of the assembly type cement concrete slab, tensioning the prestressed steel bars, temporarily anchoring the tensioned prestressed steel bars on a pedestal, welding hoisting screws on each prestressed steel bar, placing four limiting pile templates at four symmetrical corners of a central axis of the assembly type cement concrete slab, enabling the openings of the limiting pile templates to be upward, placing a template of a lead joint box at the midpoint of the assembly type cement concrete slab, overlapping concrete slab side templates on the periphery of the assembly type cement concrete slab, fixing the concrete slab side templates through concrete slab side templates and an inclined strut fixing base, then concrete is poured;
step S3, after the prefabricated assembly type cement concrete slab is maintained for 15 days, all templates and the temporarily anchored pedestals are removed, and meanwhile, redundant prestressed reinforcements on two sides of the assembly type cement concrete slab are cut off;
step S4, after the prefabricated assembled cement concrete slab is maintained for 28 days, the assembled cement concrete slab is hoisted to a pavement structure turnover device, the bottom surface of the prefabricated assembled cement concrete slab is turned over to be used as the surface layer of the pavement, all welding parts on all the square steels are cut off, an electric heating wire is arranged along the longitudinal direction of the bottom surface of the assembled cement concrete slab, and the electric heating wire is connected with a lead wire embedded in the assembled cement concrete slab and stored for standby;
step S5, paving a waterproof layer on the cleaned pavement base layer;
step S6, after the waterproof layer is completely paved, paving a layer of asphalt concrete cushion layer on the waterproof layer;
step S7, hoisting the prefabricated assembled cement concrete slab to a construction site;
step S8, precisely installing the prefabricated assembled cement concrete slab to a specified position; keeping the assembled cement concrete slab static, connecting the generator with the exposed lead in the lead joint box, operating the generator, conducting current to the electric heating wire through the lead to soften the asphalt concrete cushion, enabling the elevation of the assembled cement concrete slab to be consistent with that of the original asphalt concrete pavement, closing and dismantling the generator, sealing the lead joint box by using a metal cover plate, and then pouring asphalt into the expansion joint around the prefabricated assembled cement concrete slab to enable the prefabricated assembled cement concrete slab to be connected with the original asphalt concrete pavement around into a whole;
and step S9, filling the reserved holes of the hoisting screws with asphalt to be compact.
Further, in step S2, when the fabricated concrete slab is a prefabricated product made of two different materials, the cast concrete is specifically: the method comprises the steps of pouring a layer of steel fiber concrete on the bottom layer of a template in a cast-in-place mode, vibrating and tamping the steel fiber concrete to form a steel fiber concrete layer, then pouring common concrete, spraying a layer of solution of concrete retarder on the top surface of the common concrete layer, blowing away fine aggregate on the surface of the common concrete layer when the common concrete is not completely solidified, enabling the coarse aggregate to be partially exposed in the air and partially embedded into the concrete, additionally laying an asphalt concrete surface layer on the exposed coarse aggregate of the common concrete layer, and vibrating and compacting the newly laid asphalt concrete surface layer.
The invention also aims to provide a pavement structure overturning device of the construction method of the high-comfort assembly type cement concrete pavement restoration structure, which consists of bearing platforms on two sides, temporary support piles, a round steel shaft, horizontal square steel, vertical square steel and a screw clamp; a rotating disc, a main bearing, a main gear, a pinion, a crawler belt and a motor are respectively arranged in each side bearing platform;
placing five horizontal square steels on the bottom surface of the assembled cement concrete slab at equal intervals, placing five horizontal square steels on the top surface of the assembled cement concrete slab at equal intervals, welding one side ends of the five horizontal square steels on the top surface of the assembled cement concrete slab together by adopting two circular steel shafts respectively, connecting the horizontal square steels on the top surface of the assembled cement concrete slab and the horizontal square steels on the bottom surface by adopting vertical square steels, respectively arranging two bearing platforms at the two lower ends of the assembled cement concrete slab, respectively inserting the two ends of each circular steel shaft into rotating discs arranged on the two bearing platforms at the two sides, connecting the rotating disc in each bearing platform at each side with a main gear through a main bearing, meshing the main gear with an auxiliary gear, and connecting the auxiliary gear with a motor through a crawler; two temporary supporting piles are respectively arranged at the middle positions of the bottom surfaces of the assembled prefabricated concrete slabs.
Further, adopt vertical square steel to connect between the horizontal square steel of assembled cement concrete slab top surface and the horizontal square steel of bottom surface, specifically be: the screw rod clamp is adopted to penetrate through the vertical square steel, the two sides of the screw rod clamp penetrate through the horizontal square steel at the top and the bottom respectively, and the vertical square steel is connected with the horizontal square steel on the two sides of the top and the bottom of the fabricated cement concrete slab through screwing the screw caps on the screw rod clamp.
The invention has the beneficial effects that:
(1) according to the invention, the asphalt concrete pavement is repaired by the fabricated cement pavement, so that the phenomena of rutting, pushing embrace, cracking, local plastic deformation and the like of the asphalt concrete pavement structure can be avoided; and all parts of the assembly type cement concrete pavement structure are prefabricated in a factory and then are uniformly and mechanically installed on site, so that the requirements of rapid, mechanical and factory construction of pavement repair are met, and the construction period of the cement concrete pavement is greatly shortened.
(2) In the embodiment 2 of the invention, the pavement surface layer can greatly improve the driving comfort and the durability of the pavement structure by combining the concrete retarder, the coarse aggregate binding layer and the asphalt concrete surface layer, and simultaneously compared with the cement concrete surface layer, the asphalt concrete is adopted as the pavement surface layer of the pavement structure, so that the color of the pavement surface layer can be better coordinated with the color of the original asphalt pavement.
(3) The high-comfort assembly type cement concrete pavement restoration structure can automatically adjust the height in the construction process and is convenient to mount and dismount, and the method specifically comprises the following steps: the heating wire is arranged on the lower surface of the fabricated cement concrete slab, the generator is connected through a lead in the guide pipe, when the generator supplies the heating wire to work, an asphalt concrete cushion layer between the fabricated cement concrete slab and the base layer is softened under the heat generated by the heating wire, the elevation of the fabricated cement concrete slab can be conveniently adjusted when the fabricated cement concrete slab is installed, the top elevation of the fabricated cement concrete slab is ensured to be consistent with the height of the original road surface, the heating wire and the lead are permanently arranged in the fabricated cement concrete slab after the installation process is completed, the installation is not only convenient, but also the disassembly is convenient, a power supply is connected through a reserved lead joint box, the heating wire inputs heat to melt the asphalt concrete cushion layer, and after a hole is drilled and anchored into the screw, the fabricated cement concrete slab is lifted by using a mechanical device for hoisting a fabricated road surface structure, the excavator is not needed to break and remove, and the large-scale mechanical dismantling can be effectively avoided.
(4) According to the invention, through the pavement structure turnover device of the fabricated cement concrete slab, the original top surface which is relatively uneven and rough is used as the bottom surface in the driving process, and the original bottom surface which is relatively flat is used as the top surface in the driving process, so that the flatness of the pavement can be greatly improved, and the problem of insufficient comfort of the cement pavement is solved; simultaneously through the upset of road surface structure turning device to assembled cement concrete slab, the main bearing member of structure when the temporary support stake is as assembled cement concrete slab and square steel anchor, square steel and circular steel axle welding has avoided causing the damage to assembled cement concrete slab.
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 longitudinal sectional view of a fabricated cement concrete pavement according to example 1 of the present invention.
FIG. 2 is a schematic cross-sectional view of a fabricated cement concrete pavement according to example 1 of the present invention.
FIG. 3 is a top view of a fabricated cement concrete pavement according to example 1 of the present invention.
FIG. 4 is a simplified circuit diagram of the heating wires and leads of the fabricated asphalt cement concrete pavement according to embodiment 1 of the present invention.
Fig. 5 is a diagram of reinforcement of a fabricated concrete slab form in example 1 of the present invention.
FIG. 6 is a schematic longitudinal section of an assembled asphalt cement concrete pavement according to example 2 of the present invention.
FIG. 7 is a schematic cross-sectional view of a fabricated asphalt cement concrete pavement according to example 2 of the present invention.
Fig. 8 is a front view of the road surface structure turning device in embodiment 1 of the present invention.
Fig. 9 is a side view of the road surface structure turning device in embodiment 1 of the present invention.
In the figure: 1-asphalt, 2-prestressed reinforcement, 3-prefabricated limit pile, 4-latch, 5-original asphalt concrete pavement, 6-fabricated cement concrete slab, 7-asphalt concrete cushion, 8-waterproof layer, 9-pavement base, 10-hoisting screw, 11-steel fiber concrete layer, 12-reserved hole, 13-guide pipe, 14-lead, 15-electric heating wire, 16-metal cover plate, 17-lead joint box, 18-longitudinal steel bar, 19-transverse steel bar, 20-corner reinforcing distribution steel bar, 21-corner reinforcing connecting steel bar, 22-limit pile template, 23-concrete slab side template inclined strut, 24-concrete slab side template, 25-inclined strut fixing base, 26-asphalt concrete surface layer, 27-concrete retarder, 28-vertical square steel, 29-temporary supporting pile, 30-horizontal square steel, 31-rotating disc, 32-main bearing, 33-round steel shaft, 34-main gear, 35-screw clamp, 36-pinion, 37-bearing platform, 38-crawler and 39-motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 prefabricated assembled cement concrete slab 6, and relates to a highway subgrade design specification (JTG D30-2015), a highway subgrade construction technical specification (JTGF10-2006), a highway cement pavement design specification (JTGD 40-2011), a highway asphalt pavement design specification (JTG D50-2017) and a prestressed concrete pavement engineering technical specification (GB 50422-2017), which are not described in detail in the embodiment.
Example 1:
as shown in fig. 1 to 5, a high comfort fabricated cement concrete pavement repairing structure includes: asphalt 1, prestressed reinforcement 2, a prefabricated limiting pile 3, a latch 4, an original asphalt concrete pavement 5, an assembled cement concrete slab 6, an asphalt concrete cushion 7, a waterproof layer 8, a pavement base layer 9, hoisting screws 10, reserved holes 12, a guide pipe 13, a lead 14, an electric heating wire 15, a metal cover plate 16 and a lead joint box 17.
Four prefabricated limiting piles 3 are arranged on the pavement base layer 9 at four corner positions corresponding to the positions of the fabricated concrete slabs 6, and the top ends of the prefabricated limiting piles 3 are provided with clamping teeth; the prefabricated limiting pile 3 penetrates through a waterproof layer 8 and an asphalt concrete cushion layer 7, a latch arranged at the top end of the prefabricated limiting pile 3 is embedded into a latch 4 correspondingly arranged in an assembled cement concrete slab 6 and used for improving the combination stability of a pavement base 9 and the assembled cement concrete slab 6, the latch arranged on the prefabricated limiting pile 3 is meshed with the latch 4 on the assembled cement concrete slab 6, the prefabricated limiting pile 3 is more stably embedded into the assembled cement concrete slab 6 through mechanical meshing force, meanwhile, the combination of other structural layers is strictly carried out according to the design specification of a highway subgrade (JTG D30-2015), and the combination strength between the structural layers is ensured; a waterproof layer 8 is paved on a pavement base layer 9, an asphalt concrete cushion 7 is paved on the waterproof layer 8, an assembled cement concrete slab 6 is installed on the asphalt concrete cushion 7, and asphalt 1 is injected into an expansion joint around the assembled cement concrete slab 6 after the assembled cement concrete slab 6 is installed, so that the prefabricated assembled cement concrete slab 6 and the surrounding original asphalt concrete pavement 5 are connected into a whole.
Wherein, assembled cement concrete slab 6 is the prefab, and preferred rectangular shape, long limit length is 4.5m, and minor face length is 2.25m, and thickness is 20cm, does not set up the slope on the long edge direction, and the minor face direction sets up the slope, and the slope size is 1~ 3.
The fabricated concrete slab 6 is a poured concrete structure with a built-in reinforcing mesh, the built-in reinforcing mesh adopts longitudinal reinforcing steel bars 18 and transverse reinforcing steel bars 19 which are crossed to form a net, the spacing between the reinforcing steel bars is 100mm, the longitudinal reinforcing steel bars 18 and the transverse reinforcing steel bars 19 both adopt HRB400 three-level reinforcing steel bars with the diameter of 10mm, and the strength of the poured concrete is C30.
The corner reinforcing steel bars are bound at the four plate corners of the built-in reinforcing mesh and comprise corner reinforcing distribution steel bars 20 and corner reinforcing connecting steel bars 21, wherein the corner reinforcing distribution steel bars 20 adopt HRB400 three-level steel bars with the diameter of 14mm, the corner reinforcing connecting steel bars 21 adopt HRB400 three-level steel bars with the diameter of 6mm, and the included angle between the corner reinforcing distribution steel bars 20 is 18 degrees.
The two points at the midpoint of the top surface of the fabricated cement concrete slab 6 are taken as starting points, the two diagonal points of the bottom surface of the fabricated cement concrete slab 6 are taken as finishing points, two guide pipes 13 are correspondingly and reversely arranged, conducting wires 14 are respectively arranged in the two guide pipes 13, the two conducting wires 14 are connected by adopting heating wires 15, the heating wires 15 are nickel complex gold heating wires, the diameter is at least 3mm, the heating wires 15 are connected with the conducting wires 14 in a parallel connection mode, the distance between the heating wires 15 is 100mm, and the heating wires are used for softening an asphalt concrete cushion 7 contacted with the bottom surface of the fabricated cement concrete slab 6 after heating so as to ensure the installation precision and the stability of the fabricated cement concrete slab 6, and the parallel connection mode can ensure that when one heating wire 15 is broken in the working process, other heating wires 15 can still work normally except the broken heating wire 15.
The wire joint box 17 is arranged at the midpoint of the top surface of the fabricated concrete slab 6, the wire joint box 17 is arranged to ensure that the wire 14 can be reused, because the wire 14 needs to be electrified not only during installation, but also during the later replacement of the fabricated concrete slab, and the purpose can be better realized by the arrangement of the wire joint box 17; the upper end of the wire joint box 17 is provided with a metal cover plate 16 which is used for covering the wire 14 in the wire joint box 17 and preventing the wire 14 from being damaged; two prestressed reinforcements 2 are symmetrically arranged at the junctions of the quarter line in the horizontal direction of the short side and the half line in the vertical direction in the prefabricated cement concrete slab 6, and four reserved holes 12 are symmetrically arranged above the two prestressed reinforcements 2 and used for welding hoisting screws 10 on the prestressed reinforcements 2 through the reserved holes 12; the hoisting screw 10 is a titanium alloy screw with the diameter of 15 mm; the prestressed reinforcement 2 adopts phit18mm prestressed twisted steel (phi)tIndicating a threaded pre-stressed reinforcement),f pk =1230MPa。
the construction method of the fabricated cement concrete pavement repairing structure comprises the following steps:
(1) the construction preparation is carried out according to the design scheme, the original asphalt concrete pavement 5 generating tracks is broken through an excavator in advance at a construction site, impurities on the surface of a pavement base layer 9 are firstly removed at a working site, four prefabricated limiting piles 3 are driven into four corner positions, corresponding to the positions of the cleaned pavement base layer 9 and the prefabricated concrete slab 6, the prefabricated limiting piles 3 penetrate through a waterproof layer 8 and an asphalt concrete cushion layer 7, clamping teeth are arranged at the top ends of the prefabricated limiting piles and are embedded into clamping teeth 4 correspondingly arranged in the prefabricated concrete slab 6, the total height of the prefabricated limiting piles 3 is 10cm, and the depth of the prefabricated limiting piles inserted into the prefabricated concrete slab 6 is 3 cm.
(2) Designing shape parameters of the fabricated cement concrete slab 6 according to the width of the road width, and prefabricating the fabricated cement concrete slab 6 in a prefabrication factory; the prefabrication process of the fabricated cement concrete slab 6 comprises the following steps:
firstly, at a specified position (two points at the midpoint of the top of the conventional fabricated cement concrete slab 6 vertically downwards respectively to the depth of 615 cm of the fabricated cement concrete slab are horizontally and oppositely turned to the height of 5cm of a half line of the short side vertical surface of the fabricated cement concrete slab 6 respectively, then the height of the half line of 5cm of the short side vertical surface is oppositely transferred to the height of 5cm of one side of the short side vertical surface respectively, the vertical downward direction of the fabricated cement concrete slab 6 is respectively turned to 5cm, the contact surface between the bottom surface of the fabricated cement concrete slab 6 and the top surface of the asphalt concrete cushion layer 7 is reached, then the contact surface extends from one end to the other end of the long side of the bottom surface of the fabricated cement concrete slab 6 respectively), a guide pipe 13 is arranged, a reinforcing mesh is bound on a bottom die, the guide pipe 13 is fixed on the reinforcing mesh through steel wires, a guide wire 14 is inserted into the guide pipe 13, binding corner reinforcing steel bars on four corners of a steel bar net of a prefabricated assembly type cement concrete slab 6, symmetrically arranging prestressed steel bars 2 in the assembly type cement concrete slab 6 along the transverse direction of the assembly type cement concrete slab, tensioning the prestressed steel bars 2, temporarily anchoring the tensioned prestressed steel bars 2 on a pedestal, vertically and downwards welding hoisting screws 10 at two quarter points of each prestressed steel bar 2, wherein the length of each prestressed steel bar is 10cm, placing four limiting pile templates 22 at four corners symmetrical to the axis of the assembly type cement concrete slab 6, enabling the openings of the limiting pile templates 22 to be upwards, placing a template of a lead joint box 17 at the midpoint of the assembly type cement concrete slab 6, overlapping concrete slab side templates 24 on the periphery of the assembly type cement concrete slab 6, and fixing the concrete slab side templates 24 through concrete slab side template inclined struts 23 and inclined strut fixing bases 25, and then pouring concrete.
(3) After the prefabricated assembly type cement concrete slab 6 is maintained in a factory for 15 days, all templates and the temporarily anchored pedestals are dismantled, meanwhile, redundant prestressed reinforcements 2 on two sides of the assembly type cement concrete slab 6 are cut off, the prestressed reinforcements 2 are cut off by adopting a grinding wheel saw, and the ends of the prestressed reinforcements are neat.
(4) After the prefabricated assembled cement concrete slab 6 is maintained in a factory for 28 days, hoisting the assembled cement concrete slab 6 to a pavement structure turnover device by using an engineering crane, wherein the pavement structure turnover device consists of two side bearing platforms 37, temporary supporting piles 29, a round steel shaft 33, horizontal square steel 30, vertical square steel 28 and a screw clamp 35 as shown in fig. 8 and 9; each side bearing platform 37 is internally provided with a rotating disc 31, a main bearing 32, a main gear 34, a pinion gear 36, a crawler 38 and a motor 39.
Place the bottom surface at assembled cement concrete slab 6 with five horizontal square beams 30 equidistant, place the top surface at assembled cement concrete slab 6 with five horizontal square beams 30 equidistant, then adopt two circular steel axles 33 respectively with one side end welding together of the five horizontal square beams 30 of assembled cement concrete slab 6 top surface, adopt vertical square beam 28 to connect between the horizontal square beam 30 of assembled cement concrete slab 6 top surface and the horizontal square beam 30 of bottom surface, specifically be: the screw rod clamp 35 penetrates through the vertical square steel 28, the two sides of the screw rod clamp 35 penetrate through the top and bottom horizontal square steels 30 respectively, the screw caps on the screw rod clamp 35 are screwed to connect the vertical square steel 28 with the horizontal square steels 30 on the top and bottom surfaces of the fabricated cement concrete slab 6, and the mode that the screw rod clamp 35 is used for connecting the horizontal square steels 30 on the top and bottom surfaces of the fabricated cement concrete slab 6 is convenient for quick installation and disassembly of the fabricated cement concrete slab 6 on a pavement structure overturning device, so that the assembling efficiency is improved, and the assembling cost is saved; two bearing platforms 37 are respectively arranged at the positions of two ends below the assembled cement concrete slab 6 assembled by horizontal square steel 30, vertical square steel 28, screw rod clamps 35 and circular steel shafts 33 and used as main supporting components, two ends of each circular steel shaft 33 are respectively inserted into rotating disks 31 arranged on the bearing platforms 37 at two sides, the rotating disk 31 in each bearing platform 37 at one side is connected with a main gear 34 through a main bearing 32, the main gear 34 is meshed with a secondary gear 36, and the secondary gear 36 is connected with a motor 39 through a crawler 38; two temporary supporting piles 29 are respectively arranged at the middle position of the bottom surface of the assembled prefabricated concrete slab 6 and are used as main bearing members.
When the pavement structure overturning device is operated, the motor 39 arranged in each side bearing platform 37 is started, the motor 39 outputs power through the crawler 38 to drive the pinion 36 connected with the crawler 38 to rotate, the pinion 36 drives the main gear 34 to rotate as the pinion 36 is meshed with the main gear 34, the main gear 34 further drives the rotating disc 31 to rotate through the main bearing 32, and the rotating disc 31 drives the assembled cement concrete slab 6 to overturn through the round steel shaft 33 fixedly connected with the rotating disc 31. In the overturning process, because the two sides of the assembled cement concrete slab 6 are tightly close to the vertical square steel 28, the forces on the two sides of the assembled cement concrete slab 6 are always transmitted to the horizontal square steel 30 and the vertical square steel 28, and the assembled cement concrete slab 6 is prevented from being damaged.
After the turning process is completed, the bottom surface of the prefabricated assembled cement concrete slab 6 is turned over to be used as a surface layer of a road, welding parts on all the square steels are cut off, an electric heating wire 15 is arranged along the longitudinal direction of the bottom surface of the prefabricated assembled cement concrete slab 6, the electric heating wire 15 is connected with a lead 14 embedded in the prefabricated assembled cement concrete slab 6, and then the prefabricated assembled cement concrete slab 6 is hoisted into a slab storage area of a hoisting vehicle.
(5) And paving a waterproof layer 8 on the cleaned pavement base layer 9, wherein the waterproof layer is made of a modified asphalt material and has the thickness of 1 mm.
(6) And after the waterproof layer 8 is completely paved, paving a layer of asphalt concrete cushion 7 on the waterproof layer 8, wherein the thickness is 2cm, and the particle size of asphalt concrete aggregate is less than 5 mm.
(7) The prefabricated concrete prefabricated panels 6 are hoisted from the storage area on the hoisting vehicle to the construction site.
(8) The prefabricated assembled cement concrete plate 6 is accurately installed at a designated position through an infrared sighting device (devices with accurate sighting functions can be realized) on a hoisting vehicle; keeping the assembly type cement concrete slab 6 static, connecting a generator with a lead 14 exposed in a lead joint box 17, operating the generator, conducting current to an electric heating wire 15 through the lead 14, and softening an asphalt concrete cushion 7 by heat generated by the electric heating wire 15, wherein the arrangement mode can effectively ensure the installation precision and stability of the assembly type cement concrete slab 6, so that the elevation of the assembly type cement concrete slab 6 is consistent with that of the original asphalt concrete pavement 5, closing and dismantling the generator, and sealing the lead joint box 17 by a metal cover plate 16; then, the asphalt 1 is poured into the expansion joint around the prefabricated assembled cement concrete slab 6, so that the prefabricated assembled cement concrete slab 6 and the surrounding original asphalt concrete pavement 5 are connected into a whole.
(9) The reserved hole 12 of the hoisting screw 10 is filled and compacted by asphalt 1.
(10) And (5) after the construction site is cleaned, the traffic operation is recovered.
Example 2
As shown in fig. 6 and 7, another fabricated asphalt cement concrete pavement structure includes: asphalt 1, prestressed reinforcement 2, a prefabricated limiting pile 3, a latch 4, an original asphalt concrete pavement 5, an assembled cement concrete slab 6, an asphalt concrete cushion 7, a waterproof layer 8, a pavement base layer 9, hoisting screws 10, reserved holes 12, a guide pipe 13, a lead 14, an electric heating wire 15, a metal cover plate 16, a lead joint box 17 and an asphalt concrete surface layer 26.
Unlike embodiment 1, the fabricated concrete slab 6 of the present embodiment is a prefabricated product made of two different materials, i.e., an upper part and a lower part, and preferably has a rectangular parallelepiped shape, specifically: the lower part is a steel fiber concrete layer 11 with the thickness of 5cm, the upper part is a common concrete layer with the thickness of 15cm, a concrete retarder 27 is sprayed on the surface of the common concrete layer on the upper part, and then an asphalt concrete surface layer 26 is paved on the common concrete layer sprayed with the concrete retarder 27.
The construction method of the fabricated cement concrete pavement repairing structure comprises the following construction steps:
in the step (2), after the overlapping of the formworks of the assembled cement concrete slabs 6 and the binding of the reinforcing mesh are completed, a layer of steel fiber concrete is cast in situ on the bottom layer of the formwork, the steel fiber concrete is vibrated and tamped to form a steel fiber concrete layer 11, and then common concrete is cast; spraying a layer of solution of a concrete retarder 27 on the top surface of a common concrete layer, blowing away fine aggregates on the surface of the common concrete layer by using an engineering fan when the common concrete is not completely solidified, so that the coarse aggregates are partially exposed in the air and partially embedded in the concrete, wherein the aim of setting is to improve the combination stability of the common concrete layer and an asphalt concrete surface layer 26 by using the mechanical engaging force and the friction force which are stronger than those of the fine aggregates for the coarse aggregates, additionally paving a 4 cm-thick asphalt concrete surface layer 26 on the exposed coarse aggregates of the common concrete layer, and vibrating and compacting the newly paved asphalt concrete surface layer 26.
The rest is the same as in example 1.
It is noted that, in the present application, relational terms such as first, second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
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 (3)
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