CN111535108A - High-strength permanent pavement and construction method thereof - Google Patents
High-strength permanent pavement and construction method thereof Download PDFInfo
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- CN111535108A CN111535108A CN202010354927.0A CN202010354927A CN111535108A CN 111535108 A CN111535108 A CN 111535108A CN 202010354927 A CN202010354927 A CN 202010354927A CN 111535108 A CN111535108 A CN 111535108A
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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
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/002—Coverings, the surface of which consists partly of prefabricated units and partly of sections made in situ
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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
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
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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
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
- E01C11/06—Methods of making joints
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Abstract
The invention discloses a high-strength permanent pavement and a construction method thereof. The high-strength permanent pavement structure layer sequentially comprises a base layer, a sliding layer, an assembled prestressed cement concrete lower surface layer, a bonding layer and an asphalt concrete upper surface layer from bottom to top. The invention fully combines the advantages of a rigid pavement and a flexible pavement, the lower surface layer is the fabricated prestressed cement concrete pavement, the lower surface layer has the characteristics of high bearing capacity, long service life and strong anti-rutting capability, and the upper surface layer is the asphalt concrete pavement, so the invention has the advantages of comfortable driving, low noise and easy maintenance. In addition, due to the existence of the prestress, cracks can be prevented from being generated on the lower surface layer of the cement concrete, so that reflection cracks are avoided on the upper surface layer of the asphalt concrete, and the long-life pavement structure is suitable for heavy traffic and high-grade roads.
Description
Technical Field
The invention relates to a high-strength permanent pavement and a construction method thereof, belonging to the field of pavement construction and maintenance.
Background
In recent years, high-grade roads, particularly expressways, are largely constructed in China, and the main application of the high-grade roads is that the high-grade roads have two types: cement concrete pavements and asphalt concrete pavements. The cement concrete pavement has the advantages of high strength, good stability, strong anti-fatigue property, long service life, convenient construction material taking and the like, and can bear the road traffic load with large tonnage and large flow. However, the road surface needs to be provided with a large number of joints, the base layer is easy to seep water, the defects of mud pumping, plate bottom hollowing, cracking, slab staggering and the like are generated, the phenomenon of vehicle jumping is serious, and the driving comfort is poor. In addition, the cast-in-place cement concrete pavement has long curing time (14-28 days), needs long-time traffic sealing, and increases traffic cost. Accordingly, asphalt concrete pavements have gradually replaced cement concrete pavements as the main pavement form of high-grade highways.
The asphalt concrete pavement has the advantages of being capable of being built by stages, good in flatness, comfortable to drive, easy to repair and the like, and is widely applied to highway pavements in China. However, asphalt concrete pavements have high temperature sensitivity, and are easy to cause phenomena such as pushing, crowding, flooding and the like at high temperature in summer. With the increasing traffic volume and the serious overload phenomenon, most asphalt pavements are generally subjected to diseases such as rutting, fatigue cracking and the like in a large area after being used for years, so that the expressway enters a large-scale maintenance period in advance. Therefore, a high-strength permanent road surface having a higher service level is urgently required to meet such a demand.
In the prior art, chinese patent CNl049ll974A discloses an oblique prestressed cement concrete-asphalt concrete composite pavement, but the composite pavement has a long construction period due to the adoption of cast-in-place cement concrete, and the oblique prestressed cement concrete pavement has dense rib arrangement and large rib consumption, and a large amount of manpower is consumed for tensioning prestressed ribs. Chinese patent CN110172890A discloses a composite fabricated cement concrete pavement structure, which adopts common cement concrete, and has a large number of longitudinal and transverse joints, and the connection between the plates is weak, and under the action of vehicle load and environmental factors, the plates are easy to crack, thereby generating reflection cracks and affecting the service performance of the pavement.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a high-strength permanent pavement and a construction method thereof, which can realize that: the assembled prestressed cement concrete lower surface layer is used as a bearing layer, the asphalt mixture upper surface layer is used for improving the service performance of the pavement, the characteristics of high bearing capacity, long service life and strong anti-rutting capability of the cement concrete pavement are achieved, the advantages of comfort, low noise and easiness in maintenance of the asphalt pavement are achieved, and the characteristics of short construction period and fast open traffic are achieved.
In order to solve the technical problem, the invention is realized as follows:
a high-strength permanent pavement characterized by: the high-strength permanent pavement layer structure sequentially comprises a base layer, a sliding layer, an assembled prestressed cement concrete lower surface layer, a bonding layer and an asphalt concrete upper surface layer from bottom to top.
Further, the upper layer material of the asphalt concrete is a dense-graded asphalt mixture or an asphalt mastic mixture, and the thickness of the upper layer material of the asphalt concrete is 4-10 cm.
Furthermore, the bonding layer material is a mixture of rubber asphalt, SBS modified emulsified asphalt or epoxy asphalt and macadam, and the thickness is 0.5-1.5 cm.
Further, the thickness of the lower surface layer of the fabricated prestressed cement concrete is 16cm-26 cm.
Furthermore, the lower surface layer of the assembled prestressed cement concrete consists of three types of prefabricated plates, namely a seam expansion plate, a standard plate and an anchoring plate;
the standard plate is distributed between the expansion joint plate and the anchoring plate;
the expansion joint plates are positioned at two ends of the lower surface layer of the fabricated prestressed cement concrete, and prestressed tendon anchoring ends and expansion joints are distributed on the expansion joint plates;
the anchoring plate is positioned in the middle of the lower surface layer of the fabricated prestressed cement concrete, and an anchoring hole is reserved on the anchoring plate.
Furthermore, the sliding layer comprises fine sand with the thickness of 0.5-1cm, an asphalt leveling layer with the thickness of 2-4cm and a polyethylene film from bottom to top.
Furthermore, the base course is a newly-built pavement base course and comprises a graded broken stone base course, a cement stabilized broken stone base course, a lime stabilized broken stone base course and a roller compacted concrete base course or an old pavement base course.
The construction method of the high-strength permanent pavement comprises the following steps:
1) prefabricating a road slab: arranging templates in a prefabrication factory, and pouring cement concrete to obtain a prefabricated road slab;
2) preparing a foundation: cleaning the surface of the prefabricated pavement slab, leveling the top surface of the base layer by using fine sand with the thickness of 0.5-1cm or fine asphalt mixture with the thickness of 2-4cm, and paving a polyethylene film on the base layer to obtain a prepared prefabricated slab;
3) assembling the precast slabs: hoisting the prepared precast slabs to a specified position, smearing epoxy cement paste on the joint surfaces of the precast slabs, splicing, and temporarily tensioning to ensure that the epoxy cement paste between the contact surfaces of the adjacent precast slabs is extruded and compacted to obtain an assembled prestressed cement concrete pavement slab and reserve a pipeline;
4) stretching and drawing the penetrating ribs: after the assembly is finished, the prestressed tendons penetrate through the reserved pipelines and are tensioned twice;
5) anchoring the middle plate: after tensioning is finished, drilling a hole from the road surface to the base layer in the middle of the fabricated prestressed cement concrete pavement slab, inserting a reinforcing steel bar and pouring micro-expansion concrete to anchor the fabricated prestressed cement concrete pavement slab on the base layer;
6) grouting and sealing the anchor: filling the reserved pipeline with micro-expansion concrete mortar, cutting off overlong prestressed tendons, and filling the anchoring end with micro-expansion small-particle-size gravel cement concrete;
7) surface treatment: roughening the surface of the assembled prestressed cement concrete pavement slab, and sticking an anti-crack paste on a joint between two sections;
8) spreading a bonding layer: spraying asphalt and spreading gravel on the road surface board with the surface treated by a gravel sealing machine;
9) paving an asphalt layer: and paving an upper surface layer of the asphalt concrete on the bonding layer, and rolling and compacting.
Further, the length of one section of the fabricated prestressed cement concrete pavement slab in the step 3) is 60-180m, the width of each prefabricated slab is 3-4.5m, and the length is the full width or half width of the pavement;
stretching the penetrating ribs from the middle to two sides according to a symmetrical stretching principle in the step 4), wherein the first stretching stress is preferably 0.3 time of stretching control stress, and the second stretching stress is preferably 1.03 time of stretching control stress;
the prestressed tendons are divided into longitudinal prestressed tendons and transverse prestressed tendons, and the prestressed tendons are positioned at the position which is 0-2cm lower than the middle of the pavement slab in the thickness direction;
the depth of the middle plate anchoring chisel hole in the step 5) is not less than 60cm, and the diameter of the hole is 10-15 cm;
the speed of the gravel sealing machine in the step 8) is 1.5-2km/h, and the asphalt spreading amount is 1.6-1.9kg/m2The particle diameter of the crushed stone is 4.75-9mm, and the spreading amount of the crushed stone is 1.8-3.5kg/m2。
Compared with the prior art, the invention has the following obvious advantages:
1) the permanent pavement combines the advantages of a rigid pavement and a flexible pavement, has the characteristics of high bearing capacity, strong anti-rutting capacity, driving comfort and the like, and is a good long-life pavement.
2) The lower surface layer of the permanent pavement can avoid cracks of the cement concrete pavement due to the prestress, and simultaneously greatly reduces the number of joints of the cement concrete pavement, thereby avoiding the formation of reflection cracks on the upper surface layer of the asphalt concrete.
3) The pavement slab under the permanent pavement is prefabricated in a factory, so that the construction quality is easy to control, the influence of factors such as environment, seasons and the like is reduced, and meanwhile, the interference of site construction on traffic is greatly reduced.
Drawings
Fig. 1 is an overall schematic view of a permanent pavement structure.
Fig. 2 is a schematic perspective view of the lower surface layer of fabricated prestressed cement concrete.
Fig. 3 is a detail view of the expansion joint and anchoring end of the fabricated prestressed cement concrete lower surface layer.
FIG. 4 is a schematic view of the plate anchoring details in the fabricated prestressed cement concrete lower surface course.
Fig. 5 is a construction flow chart of a permanent pavement structure.
Wherein, (1) the asphalt concrete upper surface layer; (2) a bonding layer; (3) an assembled cement concrete lower surface layer; (4) a sliding layer; (5) a base layer; (6) seaming; (7) an anchoring sleeve; (8) an anchor region; (9) a shear key; (10) longitudinal prestressed tendons; (11) transverse prestressed tendons; (12) a seam expanding plate; (13) a standard plate; (14) an anchoring plate; (15) grouting ports; (16) an anchor box; (17) anti-crack plaster; (18) a pull rod; (19) a sleeve; (20) a pull rod coated with epoxy resin; (21) drilling a hole column; (22) micro-expansive concrete.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but the scope of the present invention is not limited by the specific embodiments, and the claims will control. In addition, any modification or change that can be easily made by a person having ordinary skill in the art without departing from the technical solution of the present invention will fall within the scope of the claims of the present invention.
As shown in figure 1, the high-strength permanent pavement of the invention comprises a base layer (5), a sliding layer (4), an assembled cement concrete lower surface layer (3), a bonding layer (2) and an asphalt concrete upper surface layer (1) from bottom to top in sequence.
The base course of the invention preferably comprises a newly-built pavement base course or an old pavement base course, and is preferably a cement-stabilized macadam newly-built pavement base course with the thickness of 36 cm.
The sliding layer is paved above a base layer, and a polyethylene film is paved on an asphalt concrete leveling layer with the thickness of 4 cm. The purpose is to level the base layer and ensure the flatness of the lower layer assembled prestressed cement concrete pavement slab; the friction between the road surface plate and the base layer is reduced, thereby reducing the prestress loss and the temperature stress of the road surface plate.
As shown in figure 2, the fabricated prestressed cement concrete pavement of the invention is composed of three types of prefabricated slabs, namely a dilatation joint slab (12), a standard slab (13) and an anchoring slab (14), and the thickness of the prefabricated prestressed cement concrete pavement is preferably 18 cm.
The fabricated prestressed cement concrete pavement comprises a joint (6), an anchoring sleeve (7), an anchoring area (8), a shearing key (9), a longitudinal prestressed tendon (10) and a transverse prestressed tendon (11). The joint between the two sections of the road slabs is used for expansion and contraction of the road slabs under the action of temperature, the anchoring sleeve is used for drilling a hole in a base layer when the middle slabs are anchored, the shearing keys are used for transferring shearing force between the precast slabs, and the gravity centers of the longitudinal prestressed tendons and the transverse prestressed tendons are located at the position 1cm below the 1/2 slab thickness. Wherein the transverse prestressing is preferably applied in a prefabrication plant using a pretensioning method. The longitudinal and transverse compressive prestress is not less than 0.7MPa, preferably 1.0 MPa.
The bonding layer is preferably an SBS modified emulsified asphalt synchronous chip seal layer with the thickness of 1 cm. Preferably, the amount of asphalt to be spread is 1.6-1.9kg/m2The particle diameter of the crushed stone is 4.75-9mm, and the spreading amount of the crushed stone is 1.8-3.5kg/m2。
The asphalt concrete layer of the invention is preferably AC-13 asphalt concrete with the thickness of 4 cm.
The construction steps of the high-strength permanent pavement disclosed by the invention are as follows:
1) and (6) prefabricating the road slab. Erecting a template, arranging constructional steel bars and prestressed tendon pipelines, pouring concrete, maintaining, and demolding and storing after certain strength is achieved. The prefabrication plant must be trial assembled before mass production to ensure that the road slab is suitable for assembly.
2) And (4) preparing a foundation. According to the technical rules of highway pavement base construction (JTG/T F20-2015), base construction is carried out to ensure the flatness, compactness and cross slope of the base, 1cm of fine sand is additionally paved on the cement stabilized macadam base, and then a layer of polyethylene film is paved.
3) And (6) assembling the precast slabs. Before the prefabricated panels are installed, epoxy resin is smeared on the joint surfaces of the prefabricated panels. When the prefabricated plates are installed, laser can be used for centering, and each prefabricated plate is placed at an accurate position. And temporarily tensioning the two adjacent prefabricated plates after each assembling.
4) And stretching the penetrating ribs. After the installation of a section of road deck is finished, the longitudinal reserved pipeline is longer, so that thin steel bars can be used for penetrating the reserved pipeline and then drawing the prestressed tendons into the pipeline. In order to ensure the stress balance of the road deck and avoid the generation of eccentric stress, the longitudinal prestressed tendons are stretched symmetrically from two sides of the central line of the road surface and are stretched from the middle to two sides. And the prestress application adopts two times of tensioning, wherein the first time of tensioning stress is 0.3 time of tensioning control stress, and the second time of tensioning stress is 1.03 time of tensioning control stress.
5) And anchoring the middle plate. The middle plate anchoring is completed after the secondary tensioning, and the influence on the middle plate anchoring effect caused by the movement of the road deck plate due to the tensioning is avoided. And (4) inserting reinforcing steel bars with the diameter of 25mm into the anchoring part of the middle plate, and pouring micro-expansion high-strength concrete.
6) Grouting and sealing the anchor. Before grouting, the ports of the prestressed tendon pipelines of the adjacent plates need to be tightly butted, and the prestressed tendon pipelines are tightly wrapped to avoid slurry leakage. The concrete mortar is poured from one end of the post-tensioned pipeline to the other end, and the flowing time of the concrete mortar at two adjacent grouting ports is used for checking the flowability of the concrete mortar. When the concrete mortar flows to the middle grouting opening, the grouting opening is blocked. And filling the anchoring end with small-particle-size gravel cement concrete after the pipeline is filled with the concrete.
7) And (6) surface treatment. The surface of the fabricated prestressed cement concrete pavement is rough by milling the surface, and anti-crack stickers are stuck at the joints between two sections of pavement slabs.
8) And spreading a bonding layer. Spraying SBS modified emulsified asphalt and spreading aggregate with intelligent broken stone sealer at speed of 1.5-2 km/h. The spreading amount of SBS modified emulsified asphalt is controlled at 1.7kg/m2(the floating range is +/-0.1), the spreading temperature of the asphalt is preferably 180 ℃ and 190 ℃, the aggregate is crushed stone with the particle size of 4.75-9.5mm, and the spreading amount of the aggregate is 3kg/m2The spreading temperature of the aggregate is controlled to be about 130 ℃.
9) And paving an asphalt layer. Paving asphalt concrete according to the technical specification of asphalt pavement construction for roads (JTF 40-2017), compacting, and finally forming the fabricated prestressed cement concrete-asphalt concrete composite pavement.
In order to further illustrate the details of the present invention, the following detailed description is given by way of examples.
Example 1
The pavement structure shown in fig. 1 is a high-strength permanent pavement, wherein the thickness of an AC-13 asphalt concrete upper surface layer (1) is 4cm, the thickness of an SBS modified emulsified asphalt synchronous macadam seal layer (2) is 1cm, the thickness of an assembly type prestressed cement concrete lower surface layer (3) is 18cm, the concrete grade is C40, the thickness of a sliding layer (4) is 4cm, an asphalt concrete + polyethylene plastic film is adopted, the thickness of a cement-stabilized macadam base layer (5) is 36cm, and the content of cement is 4.8%.
The road surface is a newly-built first-level road intersection built in a certain area in Shandong, the construction flow is shown in figure 5, and the concrete construction steps are as follows:
1) and (6) prefabricating the road slab. Erecting a template, arranging constructional steel bars and prestressed tendon pipelines, pouring concrete, maintaining, and demolding and storing after certain strength is achieved. The prefabrication plant must be trial assembled before mass production to ensure that the road slab is suitable for assembly.
2) And (4) preparing a foundation. According to the technical rules of highway pavement base construction (JTG/T F20-2015), base construction is carried out to ensure the flatness, compactness and cross slope of the base, 1cm of fine sand is additionally paved on the cement stabilized macadam base, and then a layer of polyethylene film is paved.
3) And (6) assembling the precast slabs. Before the prefabricated panels are installed, epoxy resin is smeared on the joint surfaces of the prefabricated panels. When the prefabricated plates are installed, laser can be used for centering, and each prefabricated plate is placed at an accurate position. And temporarily tensioning the two adjacent prefabricated plates after each assembling.
4) And stretching the penetrating ribs. After the installation of a section of road deck is finished, the longitudinal reserved pipeline is longer, so that thin steel bars can be used for penetrating the reserved pipeline and then drawing the prestressed tendons into the pipeline. In order to ensure the stress balance of the road deck and avoid the generation of eccentric stress, the longitudinal prestressed tendons are stretched symmetrically from two sides of the central line of the road surface and are stretched from the middle to two sides. And the prestress application adopts two times of tensioning, wherein the first time of tensioning stress is 0.3 time of tensioning control stress, and the second time of tensioning stress is 1.03 time of tensioning control stress.
5) And anchoring the middle plate. The middle plate anchoring is completed after the secondary tensioning, and the influence on the middle plate anchoring effect caused by the movement of the road deck plate due to the tensioning is avoided. And (4) inserting reinforcing steel bars with the diameter of 25mm into the anchoring part of the middle plate, and pouring micro-expansion high-strength concrete.
6) Grouting and sealing the anchor. Before grouting, the ports of the prestressed tendon pipelines of the adjacent plates need to be tightly butted, and the prestressed tendon pipelines are tightly wrapped to avoid slurry leakage. The concrete mortar is poured from one end of the post-tensioned pipeline to the other end, and the flowing time of the concrete mortar at two adjacent grouting ports is used for checking the flowability of the concrete mortar. When the concrete mortar flows to the middle grouting opening, the grouting opening is blocked. And filling the anchoring end with small-particle-size gravel cement concrete after the pipeline is filled with the concrete.
7) And (6) surface treatment. The surface of the fabricated prestressed cement concrete pavement is rough by milling the surface, and anti-crack stickers are stuck at the joints between two sections of pavement slabs.
8) And spreading a bonding layer. Spraying SBS modified emulsified asphalt and spreading aggregate with intelligent broken stone sealer at speed of 1.5-2 km/h. The spreading amount of SBS modified emulsified asphalt is controlled at 1.7kg/m2(the floating range is +/-0.1), the spreading temperature of the asphalt is preferably 180 ℃ and 190 ℃, the aggregate is crushed stone with the particle size of 4.75-9.5mm, and the spreading amount of the aggregate is 3kg/m2The spreading temperature of the aggregate is controlled to be about 130 ℃.
9) And paving an asphalt layer. Paving asphalt concrete according to the technical specification of asphalt pavement construction for roads (JTF 40-2017), compacting, and finally forming the fabricated prestressed cement concrete-asphalt concrete composite pavement.
Fig. 3 is a detailed schematic diagram of the anchoring area of the pavement assembled prestressed cement concrete lower surface layer, which comprises a grouting opening (15), an anchoring box (16), an anti-cracking paste (17) and a pull rod (18).
Fig. 4 is a detailed view of the plate anchoring details in the pavement assembled prestressed cement concrete lower surface layer, which comprises a sleeve (19), a pull rod (20) coated with epoxy resin, a drilling column (21) and micro-expansion concrete (22).
The construction of the one-section fabricated prestressed cement concrete pavement slab is completed as shown in figure 2. After the pavement structure is built and finished, the travelling comfort can be guaranteed, the anti-rutting capacity of the pavement can be greatly improved, and the passing requirement of heavy-duty vehicles is met.
The above embodiments do not limit the technical solutions of the present invention in any way, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.
Claims (9)
1. A high-strength permanent pavement characterized by: the high-strength permanent pavement layer structure sequentially comprises a base layer (5), a sliding layer (4), an assembled prestressed cement concrete lower surface layer (3), a bonding layer (2) and an asphalt concrete upper surface layer (1) from bottom to top.
2. A high-strength permanent road surface according to claim 1, characterized in that: the material of the asphalt concrete upper surface layer (1) is a dense-graded asphalt mixture or an asphalt mastic mixture, and the thickness of the asphalt concrete upper surface layer (1) is 4-10 cm.
3. A high-strength permanent road surface according to claim 1, characterized in that: the bonding layer (2) is made of rubber asphalt, SBS modified emulsified asphalt or a mixture of epoxy asphalt and macadam, and the thickness is 0.5-1.5 cm.
4. A high-strength permanent road surface according to claim 1, characterized in that: the thickness of the assembled type prestressed cement concrete lower surface layer (3) is 16cm-26 cm.
5. A high-strength permanent road surface according to claim 1, characterized in that:
the assembled prestressed cement concrete lower surface layer (3) consists of three types of prefabricated plates, namely a seam expansion plate (12), a standard plate (13) and an anchoring plate (14);
the standard plate (13) is distributed between the expansion joint plate (12) and the anchoring plate (14);
the expansion joint plates (12) are positioned at two ends of the assembled prestressed cement concrete lower surface layer (3), and prestressed tendon anchoring ends and expansion joints are distributed on the expansion joint plates;
the anchoring plate (14) is positioned in the middle of the assembled prestressed cement concrete lower surface layer (3), and an anchoring hole is reserved on the anchoring plate.
6. A high-strength permanent road surface according to claim 1, characterized in that: the sliding layer (4) comprises fine sand with the thickness of 0.5-1cm, an asphalt leveling layer with the thickness of 2-4cm and a polyethylene film from bottom to top.
7. A high-strength permanent road surface according to claim 1, characterized in that: the base course (5) is a newly-built pavement base course and comprises a graded broken stone base course, a cement stabilized broken stone base course, a two-ash stabilized broken stone base course and a roller compacted concrete base course or an old pavement base course.
8. The method of constructing a high-strength permanent road surface according to claim 1, comprising the steps of:
1) prefabricating a road slab: arranging templates in a prefabrication factory, and pouring cement concrete to obtain a prefabricated road slab;
2) preparing a foundation: cleaning the surface of the prefabricated pavement slab, leveling the top surface of the base layer by using fine sand with the thickness of 0.5-1cm or fine asphalt mixture with the thickness of 2-4cm, and paving a polyethylene film on the base layer to obtain a prepared prefabricated slab;
3) assembling the precast slabs: hoisting the prepared precast slabs to a specified position, smearing epoxy cement paste on the joint surfaces of the precast slabs, splicing, and temporarily tensioning to ensure that the epoxy cement paste between the contact surfaces of the adjacent precast slabs is extruded and compacted to obtain an assembled prestressed cement concrete pavement slab and reserve a pipeline;
4) stretching and drawing the penetrating ribs: after the assembly is finished, the prestressed tendons penetrate through the reserved pipelines and are tensioned twice;
5) anchoring the middle plate: after tensioning is finished, drilling a hole from the road surface to the base layer in the middle of the fabricated prestressed cement concrete pavement slab, inserting a reinforcing steel bar and pouring micro-expansion concrete to anchor the fabricated prestressed cement concrete pavement slab on the base layer;
6) grouting and sealing the anchor: filling the reserved pipeline with micro-expansion concrete mortar, cutting off overlong prestressed tendons, and filling the anchoring end with micro-expansion small-particle-size gravel cement concrete;
7) surface treatment: roughening the surface of the assembled prestressed cement concrete pavement slab, and sticking an anti-crack paste on a joint between two sections;
8) spreading a bonding layer: spraying asphalt and spreading gravel on the road surface board with the surface treated by a gravel sealing machine;
9) paving an asphalt layer: and paving an upper surface layer of the asphalt concrete on the bonding layer, and rolling and compacting.
9. A construction method of a high-strength permanent road surface according to claim 8, characterized in that:
the length of one section of the fabricated prestressed cement concrete pavement slab in the step 3) is 60-180m, the width of each prefabricated slab is 3-4.5m, and the length is the full width or half width of the pavement;
stretching the penetrating ribs from the middle to two sides according to a symmetrical stretching principle in the step 4), wherein the first stretching stress is preferably 0.3 time of stretching control stress, and the second stretching stress is preferably 1.03 time of stretching control stress;
the prestressed tendons are divided into longitudinal prestressed tendons (10) and transverse prestressed tendons (11), and the prestressed tendons are positioned at the position which is 0-2cm lower than the middle of the pavement slab in the thickness direction;
the depth of the middle plate anchoring chisel hole in the step 5) is not less than 60cm, and the diameter of the hole is 10-15 cm;
the speed of the gravel sealing machine in the step 8) is 1.5-2km/h, and the asphalt spreading amount is 1.6-1.9kg/m2The particle diameter of the crushed stone is 4.75-9mm, and the spreading amount of the crushed stone is 1.8-3.5kg/m2。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113062164A (en) * | 2021-03-05 | 2021-07-02 | 武汉理工大学 | Double-layer composite full-prefabricated assembly type pavement and construction method |
| CN113403905A (en) * | 2021-06-29 | 2021-09-17 | 中冶南方城市建设工程技术有限公司 | Fabricated concrete pavement and construction method |
| WO2023178455A1 (en) * | 2022-03-22 | 2023-09-28 | Fernandez Valdivieso Jose Pablo | Urban and interurban resilient pavement |
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| CN113062164A (en) * | 2021-03-05 | 2021-07-02 | 武汉理工大学 | Double-layer composite full-prefabricated assembly type pavement and construction method |
| CN113403905A (en) * | 2021-06-29 | 2021-09-17 | 中冶南方城市建设工程技术有限公司 | Fabricated concrete pavement and construction method |
| WO2023178455A1 (en) * | 2022-03-22 | 2023-09-28 | Fernandez Valdivieso Jose Pablo | Urban and interurban resilient pavement |
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