CN112342856A - Prefabricated reinforced concrete hollow slab pavement for permafrost region and preparation method thereof - Google Patents
Prefabricated reinforced concrete hollow slab pavement for permafrost region and preparation method thereof Download PDFInfo
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- CN112342856A CN112342856A CN202011164055.8A CN202011164055A CN112342856A CN 112342856 A CN112342856 A CN 112342856A CN 202011164055 A CN202011164055 A CN 202011164055A CN 112342856 A CN112342856 A CN 112342856A
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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
- E01C11/00—Details of pavings
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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
- E01C5/08—Reinforced units with steel frames
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Abstract
The invention relates to a prefabricated reinforced concrete hollow slab pavement in permafrost regions and a preparation method thereof, belonging to the technical field of pavement construction engineering. The transverse steel bars and the longitudinal steel bars are staggered to form a steel bar mesh, and the steel bar mesh and the hook assembly are poured to form a precast concrete body; a plurality of concrete bodies are spliced with one another to form a hollow slab pavement; a PVC hollow pipe is arranged between the reinforcement mesh and the tensile prestressed reinforcement in the concrete body; the number of the PVC hollow pipes is a plurality, and the plurality of PVC hollow pipes are arranged in parallel; the invention fully considers the sensitivity of the permafrost region foundation, utilizes the through holes and the PVC hollow pipes to assist the pavement slab in heat dissipation, protects the stability of the frozen soil roadbed to the maximum extent, and prevents the problems of foundation settlement and the like.
Description
Technical Field
The invention relates to a prefabricated reinforced concrete hollow slab pavement in permafrost regions and a preparation method thereof, belonging to the technical field of pavement construction engineering.
Background
At present, the main construction mode of a cement concrete pavement is cast-in-place paving. The cast-in-place paved cement concrete pavement has the characteristics of high strength, excellent use performance and the like. However, in the construction process, the setting and hardening time of the common cement concrete is long, the strength is slowly increased, and a curing environment with certain temperature and humidity is needed, which is difficult to realize in permafrost regions and plateau regions in cold regions. In addition, the subgrade sensitivity in permafrost regions is high, the safety and the stability of roads are seriously damaged by subgrade frozen soil melting caused by large heat absorption and downward diffusion of common cement concrete pavements, and therefore reasonable structural combination design is required to realize timely dissipation of external heat, but conventional hollow holes have limited heat dissipation effect due to unobvious air circulation effect. In addition, because the existence of hollow hole leads to the hole direction to receive bending tensile stress damage more easily, consequently should set up prestressing force structure in order to promote hollow core slab life. On the other hand, the maintenance cost of the common cement concrete pavement is high, when the pavement is damaged, the original road needs to be planed and the cement concrete needs to be poured again and the maintenance needs to be carried out, and the normal traffic of the road is seriously influenced by the process. Finally, in engineering practice in permafrost regions and alpine regions, temporary roads are often paved and dismantled after use functions are completed, and at the moment, investment for paving large-scale cast-in-place pavements is large, so that resource recycling is not facilitated, prefabricated assembly type pavements are convenient to transport and pave, and a large amount of construction waste is not generated.
Disclosure of Invention
The invention provides a prefabricated reinforced concrete hollow slab pavement in a permafrost region and a preparation method thereof, aiming at the problems, the active heat dissipation function is realized by utilizing the pumping principle, and the road construction efficiency and the service performance are improved under the condition of fully protecting a frozen soil roadbed. The problem of cast-in-place cement concrete pavement construction maintenance inefficiency is solved, fully protect frozen soil road bed simultaneously, can demolish fast and used repeatedly after using to guarantee higher life.
The invention adopts the following technical scheme:
the invention provides a prefabricated reinforced concrete hollow slab pavement in a permafrost region, which comprises a reinforcing mesh consisting of transverse reinforcing steel bars and longitudinal reinforcing steel bars in a staggered manner, wherein lifting hook assemblies are arranged on the reinforcing mesh close to four corners, and the reinforcing mesh and the lifting hook assemblies form a prefabricated concrete body through pouring; a hanging groove is formed in the position, located on the hanging hook assembly, of the top of the concrete body; a plurality of concrete bodies are spliced with one another to form a hollow slab pavement; a PVC hollow pipe is arranged between the reinforcement mesh and the tensile prestressed reinforcement in the concrete body; the PVC hollow pipes are arranged in parallel; the open ends of the two ends of the PVC hollow pipe respectively extend to the lateral margin of the concrete body.
The prefabricated reinforced concrete hollow slab pavement in the permafrost region is characterized in that the lifting hook assembly consists of a fixed steel plate, a supporting steel bar and a steel bar lifting ring; the lifting hook components are positioned at four corners close to the concrete body; a supporting steel bar is vertically arranged at the central point of the fixed steel plate, and a hanging ring is arranged at the top end of the supporting steel bar; the lifting hook component is welded on a steel bar net formed by the transverse steel bars and the longitudinal steel bars in a staggered mode.
According to the prefabricated reinforced concrete hollow slab pavement in the permafrost region, PVC (polyvinyl chloride) pump suction connecting pipes are arranged in the hanging grooves in the concrete body; one side of the PVC pump suction connecting pipe extends outwards to form a communication pipeline, and the PVC pump suction connecting pipe is communicated with the PVC hollow pipe through the communication pipeline.
According to the prefabricated reinforced concrete hollow slab pavement in the permafrost region, a plurality of PVC hollow pipes are divided into a pump suction radiating pipe and a pump suction radiating pipe; if the heads and the tails of the PVC hollow pipes which are arranged in parallel are all pumping radiating pipes, the PVC hollow pipes between the heads and the tails are radiating pipes.
According to the prefabricated reinforced concrete hollow slab pavement in the permafrost region, the communication pipeline of the PVC pump suction connecting pipe is communicated with the pump suction radiating pipe.
The invention relates to a preparation method of a prefabricated reinforced concrete hollow slab pavement in a permafrost region, which comprises the following steps:
binding a main body reinforcing mesh according to the density of reinforcing steel bars, arranging transverse reinforcing steel bars below longitudinal reinforcing steel bars, and binding the cross positions of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars by using a binding belt;
arranging PVC hollow pipes in a row; and pumping connecting pipes are arranged on the head and tail PVC hollow pipes.
Welding the embedded lifting hook assembly to the bottoms of the transverse steel bars at the four corners of the pavement slab, and placing a lifting groove mold above the lifting hooks to complete installation and arrangement of the devices in the mold;
step four, arranging tensile prestressed reinforcement, and applying prestress to the tensile prestressed reinforcement by adopting a pretensioning method;
pouring cement concrete into the mold, demolding by utilizing hoisting equipment and pre-buried lifting hooks after the cement concrete is strengthened and maintained, and finishing the manufacture of the prefabricated reinforced concrete hollow slab in the permafrost region;
step six, cleaning the surface of a roadbed at a construction site, leveling the roadbed by using a road machine, and compacting the surface of the roadbed by using a steel wheel road roller;
and seventhly, transporting the prefabricated reinforced concrete pavement slab to a construction site, hoisting the hollow slabs to the installation position by utilizing the embedded lifting hooks, and paving a corresponding number of hollow slabs according to the designed road width requirement.
Advantageous effects
According to the prefabricated reinforced concrete hollow slab pavement in the permafrost region, the sensitivity of the foundation in the permafrost region is fully considered, the through holes and the PVC hollow pipes are used for assisting the pavement slab to dissipate heat, the stability of the frozen soil roadbed is protected to the maximum extent, and the problems of foundation settlement and the like are solved. The invention is different from the common hollow road slab, the pump suction radiating pipe is formed by connecting the pump suction connecting pipe and the hollow hole, the heat circulation in the hollow pipe is accelerated by fully utilizing the vehicle running kinetic energy, the active radiating is formed, and the radiating efficiency is improved.
According to the prefabricated reinforced concrete hollow slab pavement in the permafrost region, provided by the invention, aiming at the problem of strength reduction of the arrangement position of the hollow holes, the prestressed structure is arranged to reduce the bending and pulling effects, and the service life is prolonged.
The invention has simple process and can realize standard flow indoor production. The prefabricated reinforced concrete pavement slab structure has uniform standard size, the mold manufacturing and the pavement slab manufacturing can realize flow rapid production, the cement concrete curing strengthening process can be carried out in a curing room with good conditions, and the pavement slab engineering quality can be effectively guaranteed.
The transportation and the installation are convenient and quick. The pre-buried lifting hook subassembly when the road deck shaping facilitates for its engineering transportation, can accomplish processes such as drawing of patterns, hoist and mount transportation, installation fast, can realize the road and spread promptly and use, is particularly useful for the setting of temporary road.
The prefabricated reinforced concrete hollow slab pavement in the permafrost region can be repeatedly utilized, and is convenient to maintain and disassemble. Due to the unitized design form of the road panel, when the panel is damaged at a certain road section and a certain position, a new panel can be immediately hung and replaced, so that the maintenance efficiency is greatly improved, and the maintenance cost is reduced. In addition, after the temporary pavement is used, the pavement board can be quickly recovered, and the resource recycling is realized. A large amount of engineering waste and construction waste can not be generated, and the construction site environment can be effectively protected.
Drawings
FIG. 1 is a structural view of a prefabricated reinforced concrete hollow slab in a permafrost region;
FIG. 2 is a detailed view of pump suction connecting pipes of a prefabricated reinforced concrete hollow slab in a permafrost region;
FIG. 3 is a schematic view of a reinforcing mesh structure of a prefabricated reinforced concrete hollow slab in a permafrost region;
FIG. 4 is a cross-sectional view of prefabricated reinforced concrete in a permafrost region;
FIG. 5 is a longitudinal sectional view of a prefabricated reinforced concrete hollow slab in a permafrost region;
FIG. 6 is a schematic view of a prefabricated hook assembly;
FIG. 7 is a front view of the prefabricated hook assembly;
FIG. 8 is a top view of the pump connection tube;
fig. 9 is a side view of the pumping connection pipe.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
As shown in fig. 1: the prefabricated prestressed reinforced concrete pump suction hollow slab pavement in the permafrost region consists of a prefabricated concrete body 1, transverse steel bars 2 and longitudinal steel bars 3 which are wrapped in the prefabricated slab, a steel bar mesh, a pre-embedded hook assembly 4, a hanging groove 5, a hardened high-strength PVC hollow pipe 6 used for heat dissipation, through holes uniformly formed in the width direction of the prefabricated concrete, tensile prestressed steel bars 8 and a PVC pump suction connecting pipe 9. The precast concrete body 1 is a cuboid block with the length of 3m, the width of 1.5m and the thickness of 0.3m, and 4-6 precast blocks are arranged in parallel and can be temporarily passed by two-way lanes. Based on the principle of tire and road pumping proposed by Hayden. In the running process of the vehicle, the cavity of the rubber tire and the groove form air extrusion pumping action, the running energy of the vehicle is fully utilized, and partial hollow holes are actively and quickly radiated through the hanging groove and the pumping connecting pipe. The PVC hollow pipe 6 is divided into 2 pumping radiating pipes 7.1 and 6 general radiating pipes 7.2 according to the arrangement condition of the pumping connecting pipes.
As shown in fig. 3, 4, and 5: the transverse steel bars 2 and the longitudinal steel bars 3 are arranged at 1/3 positions on the road slab, and the transverse steel bars are positioned below the longitudinal steel bars; the tendons 9 are arranged under the road deck 1/3. The total reinforcement ratio of the transverse steel bars, the longitudinal steel bars and the prestressed reinforcements is 0.4-0.8%. The prestressed reinforcing steel bars, the longitudinal reinforcing steel bars, the supporting reinforcing steel bars and the reinforcing steel bar hanging rings are reinforcing steel bars with the diameter of 12-16 mm, and the transverse reinforcing steel bars are reinforcing steel bars with the diameter of 12-20 mm and are all twisted steel bars. In order to strengthen the strength of the corners of the pavement slab and ensure the stability of the embedded hook assemblies, the arrangement density of the reinforcing steel bars on the four sides of the pavement slab is greater than that of the middle position.
The PVC hollow pipes 6 with the diameter of 8cm are distributed along the width direction and are arranged 1/2 below the road surface board. And part of the hollow pipe is combined with the PVC pump suction connecting pipe, so that the heat loss is accelerated by utilizing the running kinetic energy of the vehicle, and the water damage caused by water accumulation of the through hole is prevented.
As shown in fig. 6 and 7: the embedded lifting hook assembly is composed of a fixed steel plate 4.1, a supporting steel bar 4.2 and a steel bar hanging ring 4.3, the fixed steel plate is a steel plate with the length of 16cm, the width of 12cm and the height of 1.8cm, and the supporting steel bar and the steel bar hanging ring are both threaded steel bars with the diameter of 16 mm. A single prefabricated road deck contains pre-buried lifting hook subassembly 4, distributes in prefabricated road deck four corners department, and fixed steel sheet and horizontal reinforcing bar bottom weld. The lifting groove 5 is a cylindrical empty groove, the diameter of the lifting groove is 8cm, the depth of the lifting groove is 6.4cm, the lifting groove is located at four corners of the pavement slab, and a steel bar lifting ring 4.3 is arranged in the lifting groove and used for lifting and carrying by a lifting device.
The method for constructing the precast hollow slab pavement comprises the following steps:
step one, binding a main body reinforcing mesh according to the reinforcing steel bar density shown in the figure 3, arranging transverse reinforcing steel bars below longitudinal reinforcing steel bars, and binding the crossed parts of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars by using a binding belt;
secondly, arranging hard PVC pipes (6) according to the distribution form shown in figure 1, wherein the outer diameter of the used PVC pipes is 80 mm; 4 pumping connection pipes are arranged.
Welding the embedded lifting hook assembly 4 to the bottoms of the transverse steel bars at the four corners of the pavement slab, and placing a lifting groove 5 mould above the lifting hook to complete installation and arrangement of the devices in the mould;
setting a prestressing device, and applying prestressing force to the steel bars by adopting a pretensioning method;
pouring cement concrete into the mold, demolding by utilizing hoisting equipment and pre-buried lifting hooks after the cement concrete is strengthened and maintained, and finishing the manufacture of the prefabricated reinforced concrete hollow slab in the permafrost region;
step six, cleaning the surface of a roadbed at a construction site, leveling the roadbed by using a road machine, and compacting the surface of the roadbed by using a steel wheel road roller;
and seventhly, transporting the prefabricated reinforced concrete pavement slab to a construction site, hoisting the hollow slabs to the installation position by utilizing the embedded lifting hooks, and paving a corresponding number of hollow slabs according to the designed road width requirement.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The prefabricated reinforced concrete hollow slab pavement for the permafrost region comprises a reinforcement mesh formed by staggering transverse reinforcements (2) and longitudinal reinforcements (3), wherein lifting hook assemblies (4) are arranged at four corners of the reinforcement mesh, and the reinforcement mesh and the lifting hook assemblies (4) are poured to form a prefabricated concrete body (1); a hanging groove (5) is formed at the position, located on the hanging hook component (4), of the top of the concrete body (1); a plurality of concrete bodies (1) are spliced with each other to form a hollow slab pavement; the method is characterized in that: a PVC hollow pipe (6) is arranged between the reinforcement mesh and the tensile prestressed reinforcement (8) in the concrete body (1); the number of the PVC hollow pipes (6) is multiple, and the multiple PVC hollow pipes (6) are arranged in parallel; the open ends of the two ends of the PVC hollow pipe (6) respectively extend to the lateral margin of the concrete body (1).
2. The prefabricated assembly type reinforced concrete hollow slab pavement of the permafrost region according to claim 1, characterized in that: the lifting hook assembly (4) consists of a fixed steel plate (4.1), a supporting steel bar (4.2) and a steel bar lifting ring (4.3); the lifting hook components (4) are positioned at four corners close to the concrete body (1); a supporting steel bar (4.2) is vertically arranged at the central point of the fixed steel plate (4.1), and a hanging ring (4.3) is arranged at the top end of the supporting steel bar (4.2); the lifting hook component (4) is welded on a steel bar net formed by the transverse steel bars (2) and the longitudinal steel bars (3) in a staggered mode.
3. The prefabricated assembly type reinforced concrete hollow slab pavement of the permafrost region according to claim 1, characterized in that: a PVC pump suction connecting pipe (9) is arranged in the hanging groove (5) in the concrete body (1); one side of the PVC pump suction connecting pipe (9) extends outwards to form a communication pipeline, and the PVC pump suction connecting pipe (9) is communicated with the PVC hollow pipe (6) through the communication pipeline.
4. The prefabricated assembly type reinforced concrete hollow slab pavement of the permafrost region according to claim 1, characterized in that: the PVC hollow pipes (6) are divided into a pumping radiating pipe (7.1) and a radiating pipe (7.2); the head and the tail of the plurality of PVC hollow pipes (6) which are arranged in parallel are all provided with a pumping radiating pipe (7.1), and the PVC hollow pipes (6) between the head and the tail are provided with radiating pipes (7.2).
5. The permafrost region prefabricated assembly type reinforced concrete hollow slab pavement according to claim 3 or 4, characterized in that: the communication pipeline of the PVC pump suction connecting pipe (9) is communicated with the pump suction radiating pipe (7.1).
6. The method for preparing the prefabricated reinforced concrete hollow slab pavement in the permafrost region according to any one of claims 1 to 5, is characterized in that: the method comprises the following steps:
binding a main body reinforcing mesh according to the density of reinforcing steel bars, arranging transverse reinforcing steel bars below longitudinal reinforcing steel bars, and binding the cross positions of the transverse reinforcing steel bars and the longitudinal reinforcing steel bars by using a binding belt;
arranging PVC hollow pipes (6); a pump suction connecting pipe is arranged on the head and tail PVC hollow pipe (6);
welding the embedded lifting hook assembly (4) to the bottoms of the transverse steel bars at the four corners of the pavement slab, and placing a lifting groove (5) mould above the lifting hook to complete installation and arrangement of the devices in the mould;
step four, tensile prestressed reinforcement (8) is arranged, and a pretensioning method is adopted to apply prestress to the tensile prestressed reinforcement (8);
pouring cement concrete into the mold, demolding by utilizing hoisting equipment and pre-buried lifting hooks after the cement concrete is strengthened and maintained, and finishing the manufacture of the prefabricated reinforced concrete hollow slab in the permafrost region;
step six, cleaning the surface of a roadbed at a construction site, leveling the roadbed by using a road machine, and compacting the surface of the roadbed by using a steel wheel road roller;
and seventhly, transporting the prefabricated reinforced concrete pavement slab to a construction site, hoisting the hollow slabs to the installation position by utilizing the embedded lifting hooks, and paving a corresponding number of hollow slabs according to the designed road width requirement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011164055.8A CN112342856B (en) | 2020-10-27 | 2020-10-27 | Prefabricated reinforced concrete hollow slab pavement for permafrost region and preparation method thereof |
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| CN202011164055.8A CN112342856B (en) | 2020-10-27 | 2020-10-27 | Prefabricated reinforced concrete hollow slab pavement for permafrost region and preparation method thereof |
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| CN112342856B CN112342856B (en) | 2022-04-15 |
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Cited By (1)
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