CN116837684A - Paving method of composite pavement structure - Google Patents

Abstract

The invention discloses a paving method of a composite pavement structure, which comprises the following steps: paving a broken stone cushion layer; paving a lean concrete base layer; paving an isolation sliding layer; paving an assembled prestressed concrete lower layer; further, the method comprises the following steps: prefabricating a side plate and a middle plate; sequentially installing the side plates, the middle plates and the side plates from head to tail according to the sequence of the side plates, the middle plates and the side plates; a gap of 18cm-22cm is reserved between the longitudinally adjacent plates and is used for setting a self-stress gap; reserving a gap of 2cm-3cm between the edge and the semi-rigid asphalt pavement at the two sides; processing the self-stress joint; pouring a leveling layer; treating asphalt mortar joints; paving an adhesive layer; and paving a high-modulus asphalt concrete upper layer. Correspondingly, the invention also provides a maintenance method for the damaged pavement structure. The composite pavement structure formed by adopting the paving method or the maintenance method has longer service life and higher safety.

Description

Paving method of composite pavement structure

Technical Field

The invention belongs to the technical field of road maintenance and paving, and particularly relates to a paving method of a composite pavement structure and a maintenance method using the paving method. Wherein damaging the pavement structure refers to damaging the semi-rigid asphalt pavement structure.

Background

The semi-rigid pavement is a basic layer built by using soil or broken stone treated by inorganic binders such as cement, lime and the like and industrial waste residues containing hydraulic binders. The high-strength concrete has the mechanical properties of a flexible pavement in the early stage, and the strength and the rigidity in the later stage are greatly increased, but the final strength and the rigidity are still far smaller than those of cement concrete. Because the rigidity of such materials is between a flexible road surface and a rigid road surface, such a base layer and an asphalt pavement layer laid thereon are collectively referred to as a semi-rigid road surface.

The semi-rigid asphalt pavement has good mechanical property and travelling comfort, is suitable for passing various vehicles, and has good anti-skid, anti-seepage and anti-fatigue properties, so that the semi-rigid asphalt pavement is widely used. However, due to the shrinkage characteristics of the semi-rigid material and the temperature shrinkage characteristics of the semi-rigid material, under the action of factors such as vehicle load and environment, phenomena of early damage of the asphalt pavement, such as base layer cracking, reflection cracking, longitudinal cracking, pavement local concave cracking and the like, occur, and the normal use of the highway is seriously affected.

At the level crossing and the heavy traffic road section, the semi-rigid asphalt pavement bears the larger load action of vehicles, the asphalt pavement of the traffic lane is easy to get out of ruts, the semi-rigid base layer is easy to generate transverse cracks and reflect to the asphalt pavement, the service life of the pavement is shortened, and potential safety hazards are brought to the running of the vehicles.

Therefore, a technology is needed to repair the paved semi-rigid asphalt pavement in time when the semi-rigid asphalt pavement is in a problem, and the damaged semi-rigid asphalt pavement can be replaced by paving a new pavement structure, so that the best driving effect can be achieved while the potential safety hazard is eliminated.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a paving method of a composite pavement structure.

According to an aspect of the present invention, there is provided a paving method of a composite pavement structure, the paving method comprising:

step S101, paving a broken stone cushion layer;

step S102, laying a lean concrete base layer;

step S103, paving an isolation sliding layer;

step S104, paving an assembled prestressed concrete lower layer; further, the method comprises the following steps:

step S104-1, prefabricating a side plate and a middle plate;

step S104-2, sequentially installing the side plates, the middle plates and the side plates from head to tail according to the sequence of the side plates; a gap of 18cm-22cm is reserved between the longitudinally adjacent plates and is used for setting a self-stress gap; reserving a gap of 2cm-3cm between the edge and the semi-rigid asphalt pavement at the two sides;

step S104-3, processing the self-stress joint;

step S105, pouring a leveling layer;

step S106, asphalt mortar joint treatment;

step S107, paving an adhesive layer;

and S108, paving a high-modulus asphalt concrete upper layer.

According to an embodiment of the present invention, the step S103 further includes:

step S103-1, sprinkling emulsified asphalt on the lean concrete base layer;

step S103-2, paving a layer of geotextile on the emulsified asphalt;

step S103-3, paving double-layer plastic cloth on the geotextile;

and step S103-4, smearing lubricating oil between the double-layer plastic cloths.

According to another embodiment of the invention, the width of the side plates and the middle plate is 4cm-6cm narrower than one lane, the thickness is 16cm-24cm, and the length is 6m-9m; the design label is 35MPa-45MPa; the steel strands are uniformly distributed at the position 1cm below the steel strands in the plate;

two ends of the middle plate are provided with double-layer self-stress seam connecting ribs which are in one-to-one correspondence and uniformly distributed;

the outer side end part of the side plate is provided with a self-stress tensioning device and high-expansion concrete, and the inner side end part of the side plate is provided with double-layer self-stress connecting ribs corresponding to the middle plate one by one.

According to yet another embodiment of the present invention, the step S104-3 is further:

sealing the gaps among the side plates, the middle plate, the isolation sliding layer and the semi-rigid asphalt pavement in the self-stress joint by using building glue;

welding self-stress seam connecting ribs in one-to-one correspondence, and binding self-stress seam stirrups;

and pouring high-expansion concrete, wherein the expansion dosage of the high-expansion concrete is 8% -12%.

According to still another embodiment of the present invention, the step S105 further includes:

mixing emulsified asphalt mortar;

discharging the asphalt mortar into a storage hopper, and opening a valve after the storage hopper reaches 80% of capacity, wherein the asphalt mortar is poured into the bottom of the plate through a pouring hole;

and after the pouring is finished, the pouring hole is sealed by high-grade mortar.

According to still another embodiment of the present invention, the step S108 further includes:

s108-1, paving high-modulus asphalt concrete with the thickness of 3cm-5cm on the adhesive layer, and compacting;

step S108-2, setting a lane marking.

According to a further embodiment of the invention, the high modulus agent is incorporated in the high modulus asphalt concrete in an amount of 0.5% to 0.6%.

According to another aspect of the present invention, there is provided a repair method of damaging a semi-rigid asphalt pavement structure, the repair method comprising:

cutting and chiseling the damaged semi-rigid asphalt pavement;

paving a composite pavement structure;

the composite pavement structure is paved by adopting the paving method of the composite pavement structure provided by any one of the technical schemes.

According to one embodiment of the present invention, the cutting and chiseling of damaged semi-rigid asphalt pavement further comprises:

determining a cutting size according to the damage degree of the semi-rigid asphalt pavement;

determining a milling size according to the cutting size, and milling the semi-rigid asphalt pavement by using a milling machine;

performing one-time cutting on the semi-rigid asphalt pavement according to the cutting size;

cutting the disposable cut semi-rigid asphalt pavement into a plurality of small pieces;

and chiseling the semi-rigid asphalt pavement.

According to another embodiment of the present invention,

the cutting size is as follows:

the length of the cut is the damaged length of the semi-rigid asphalt pavement, the width of the cut is the width of one lane, and the depth of the cut is the thickness of the asphalt-assembled prestressed concrete composite pavement for replacing the semi-rigid asphalt pavement;

the milling dimension is as follows:

the length of milling is the damaged length of the semi-rigid asphalt pavement, the width of the milling is 20cm-30cm wider than each side of the original lane, and the depth of the milling is 3cm-5cm.

The leveling layer is formed by pouring cement emulsified asphalt mortar, so that the problem of stress concentration caused by difficulty in attaching a prestressed pavement slab and a base layer together is solved; the laying of the base layer and the cushion layer does not need large machinery, and the influence on the traffic of the level crossing is small; the upper layer is composed of high-modulus asphalt concrete, and has strong deformation resistance; the lower layer is composed of an assembled prestressed concrete pavement slab, and due to the existence of prestress and self-stress, the whole lower layer works seamlessly and has the function of isolating the reflection cracks of the base layer, so that the maintenance times of the surface layer can be effectively reduced. Compared with a semi-rigid asphalt pavement structure, the composite pavement structure paved by adopting the paving method disclosed by the invention has longer service life and higher economical efficiency, and can radically eliminate traffic safety hidden trouble caused by rutting and transverse cracks.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:

FIG. 1 is a schematic flow chart of an embodiment of a method for paving a composite pavement structure according to the present disclosure;

FIG. 2 is a front cross-sectional view of the composite pavement structure of the present invention;

FIG. 3 is a front cross-sectional view of one embodiment of an underlying layer of fabricated prestressed concrete according to the present invention;

FIG. 4 is a top view of the underside of the fabricated prestressed concrete layer of FIG. 3;

FIG. 5 is a schematic perspective view of one embodiment of a self-stressing tension device in accordance with the present invention;

FIG. 6 is a top view of one embodiment of a middle plate, sideplate height adjustment apparatus of the present invention;

FIG. 7 is a front view of the middle plate and sideplate height adjustment apparatus of FIG. 6;

fig. 8 is a schematic connection diagram of an embodiment of the mortar pouring device according to the invention.

The same or similar reference numbers in the drawings refer to the same or similar parts.

The reference numerals are as follows:

1, a semi-rigid asphalt pavement; 2 a high modulus asphalt concrete upper layer; 3, an adhesive layer; 4, assembling a prestressed concrete lower layer; 5 leveling the layer; 6, isolating the sliding layer; a lean concrete foundation; 8, a broken stone cushion layer; 9 roadbed; 10 tar sands; 11 cutting lines; 12, middle plate; 13 side plates; 14 ordinary concrete; 15 high expansion concrete; 16 steel strands; 17 self-stressing reinforcing steel bars; 18 self-stressing tension sheet; 19 self-stress connecting ribs; 20 self-stress joint stirrups; 21 self stress joints; 22 compensating stress dividing lines at the end parts of the side plates; 23 self-stressing rebar stirrups; 24 grouting holes; 25 steel backing plates; 26 square head screw rods; 27 pre-buried steel plates; 28 anchoring ribs; 29 leveling the horizontal steel plate; 30 plain end concrete mixer; 31 a hopper; 32, filling a hose; 33 a blanking port of the stirrer; 34 blanking valve; 35 blanking hoses; 36, clamping the binding belt; 37 transverse bars; 38 lane marking center line; 39 milling lines; 40 geotextile; 41 double-layer plastic cloth.

Detailed Description

The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.

Referring to fig. 1, the present invention provides a paving method of a composite pavement structure, the paving method comprising:

and step S101, paving the crushed stone cushion layer 8.

Further, the gravel cushion 8 is paved, and the original paving position is firstly cleaned, for example, the residual waste of the semi-rigid asphalt pavement on the roadbed 9 is cleaned, and the lower bearing layer of the gravel cushion 8 is cleaned and leveled. Secondly, a main paving process is carried out, and a 15cm-20cm broken stone cushion layer 8 is required to be paved. And leveling treatment is carried out after paving so that the subsequently formed pavement structure is smoother. After leveling, compacting treatment is needed, and the compactness is not less than 95%. Preferably, small-sized vibration compaction equipment is adopted for compaction operation, so that not only is the cost saved, but also the influence on the surrounding environment is small. And finally, paving a mortar layer with the length of 2cm-3cm on the crushed stone cushion layer 8, and standing for 2-3 days. The laying of the gravel cushion 8 can be completed through the above operation.

Step S102 is continued, and the lean concrete foundation 7 is laid.

Firstly, sprinkling water on a mortar layer to fully wet the mortar layer; pouring lean concrete on the mortar layer, vibrating and compacting the lean concrete, and leveling; finally, the laying of the lean concrete foundation layer 7 can be completed by covering the foundation layer with the moisturizing cotton for 3 to 5 days.

Step S103, laying the isolation slide layer 6. The insulating slip layer 6 consists of one geotextile 40 and two plastic cloths 41.

The laying steps comprise:

step S103-1, sprinkling emulsified asphalt on the lean concrete base layer 7;

step S103-2, paving a layer of geotextile 40 on the emulsified asphalt;

step S103-3, paving double-layer plastic cloth 41 on the geotextile 40;

and step S103-4, coating lubricating oil between the double-layer plastic cloths 41.

Step S104, paving an assembled prestressed concrete lower layer; further, the method comprises the following steps:

step S104-1, prefabricating the side plates and the middle plate.

The middle plate 12 and the side plates 13 are prefabricated by pre-tensioning prefabricated plates, and after the steel strands 16 in the pre-tensioning prefabricated plates are cut off and released, the steel strands 16 transmit stress through friction with surrounding concrete, so that the stress at the plate ends has a transmission length, and the stress does not reach a design value in the transmission length, and stress compensation is needed.

The specific operation of the prefabricated middle plate 12 and the side plates 13 is as follows:

manufacturing a tensioning table, so that the width of the tensioning table is the same as the widths of the side plates 13 and the middle plate 12;

fixing end templates and side templates of the side plates 13 and the middle plate 12;

the steel strand 16 is provided with upper and lower double rows of self-stressing tendons 19 at the end of the middle plate 12 at the symmetry point of the steel strand 16. The outer end part of the side plate 13 is provided with a self-stress tensioning device, four self-stress steel bars 17 are arranged in a square shape and are welded with a self-stress tensioning plate 18, and steel strands 16 are arranged on the center point of the square shape; the other end is provided with an upper-lower double-row self-stress connecting rib 19 taking the steel stranded wire 16 as a symmetrical point.

Tensioning the steel strand 16.

Binding transverse steel bars 37 and fixing self-stress seam connecting steel bars 19, wherein the transverse steel bars 37 are arranged at the lower part of the longitudinal steel strands 16.

Reserving emulsified asphalt mortar filling holes 24 in the middle plate 12 and the side plates 13, wherein the diameter of the filling holes 24 is 8cm-10cm, for example: 8cm, 9cm or 10cm. The embedded steel plates 27 of the height adjusting device are fixed at the ends of the middle plate 12 and the side plates 13, and the embedded steel plates 27 are welded with anchoring ribs 28 serving as anchoring steel plates.

Further, the center plate 12 and the side plates 13 are cast. The middle plate 12 is poured with ordinary concrete 14 from one end to the other end; the concrete of the sideboard 13 is poured twice, the ordinary concrete 14 in the boundary line 22 of compensating stress at the end of the sideboard is poured firstly, and the part of the self-stress tensioning device extends into the ordinary concrete 14 from the stress tendons 17, and the extending length is 40cm-50cm, for example: 40cm, 45cm or 50cm; after the strength reaches 80% of the design strength, casting high expansion concrete 15 outside the end compensating stress boundary line 22, wherein the dosage of the high expansion agent is 8% -12%, for example: 8%, 10% or 12%.

And carrying out moisture preservation treatment on the poured middle plate 12 and the side plates 13 for 5-7 days.

The high expansion concrete 15 at the outer end of the side plate 13 expands to generate compressive stress on the self-stress tensile plate 18, and the self-stress tensile plate 18 generates opposite stress on the middle plate 12 and the end of the side plate 13, so that the outer end of the side plate 13 is subjected to stress compensation.

The width of the side plates 13, 12 is 4cm-6cm narrower than one lane, for example: 4cm, 5cm or 6cm; the thickness is 16cm-24cm, for example: 16cm, 20cm or 24cm; a length of 6m-9m, for example: 6m, 7m or 9m. Design labels 35MPa-45MPa, for example: 35MPa, 40MPa or 45MPa.

The steel strands 16 are uniformly distributed in the plate at a position 1cm below. After the steel strands are put into tension, the top and bottom concrete of the pretensioned precast slab have certain compressive stress, and the compressive stress of the bottom concrete is slightly larger than that of the top concrete and is matched with the actual stress of the pavement slab, so that the problem of concrete cracking caused by overlarge tensile stress of the top and bottom concrete of the pretensioned precast slab is well solved.

Preferably, the strength grade of the steel strand 16 is 1860MPa, and the diameter is 12.7mm.

Two ends of the seam of the middle plate 12 are provided with double-layer self-stress seam connecting ribs 19 which are in one-to-one correspondence and uniformly distributed. The self-stress joint connecting rib 19 is a secondary reinforcing steel bar with the diameter of 16mm-18mm, and the diameter of the self-stress joint connecting rib is as follows: 16mm, 17mm or 18mm. The length of the anchor at the end of the middle plate 12, inside the side plates 13, is 70cm-80cm, for example: 70cm, 75cm or 80cm; the length of the exposed portion is 16cm-18cm, for example: 16cm, 17cm or 18cm.

The outer end of the side plate 13 is provided with a self-stress tensioning device and high-expansion concrete 15, and the inner end is provided with double-layer self-stress connecting ribs 19 corresponding to the middle plate 12 one by one.

The self-stress tensioning device consists of a self-stress tensioning plate 18, self-stress steel bars 17 and self-stress steel bar stirrups 23. The self-stressing reinforcing steel bars 17 are four in groups, are distributed on the top of a square taking the steel strand 16 as the center, and are welded with the self-stressing tension plate 18. The self-stressing tension sheet 18 has a height of 20cm to 24cm, for example: 20cm, 22cm or 24cm; width of 15cm-20cm, for example: 15cm, 18cm or 20cm; thickness of 0.4cm-0.6cm, for example: 0.4cm, 0.5cm or 0.6cm. The diameter of the self-stressing reinforcing steel 17 is 20mm-22mm, for example: 20mm, 21mm or 22mm; a length of 1.2m-1.4m, for example: 1.2m, 1.3m or 1.4m.

Step S104-2, sequentially installing the side plates 13, the plurality of middle plates 12 and the side plates 13 from head to tail. Due to the size constraints of the middle plate 12 and the side plates 13, a plurality of plates need to be laid on each layer during road laying, and preferably, a gap of 18cm-22cm is reserved between the longitudinally adjacent plates for setting the self-stress joint 21. And a gap of 2cm-3cm is reserved between the edge and the semi-rigid asphalt pavement at the two sides.

The specific installation flow is as follows: leveling horizontal steel plates 29 of the height adjusting device are welded to the ends of the side plates 13 and the middle plate 12. Referring to fig. 6 and 7, the length of the leveling horizontal steel plate 29 is 6cm-8cm, for example: 6cm, 7cm or 8cm; width of 4cm-5cm, for example: 4cm, 4.5cm or 5cm; thickness of 6mm-8mm, for example: 6mm, 7mm or 8mm; and a sleeve wire hole with the diameter of 20-22 mm is reserved in the middle. After the leveling horizontal steel plate 29 is hauled to the site, it is installed in the order of the sideboard 13, the plurality of middle boards 12, and the sideboard 13. A square head screw 26 is screwed into the leveling horizontal steel plate 29. Preferably, the square head screw 26 has a diameter of 20mm to 22mm, for example: 20mm, 21mm or 22mm. The square head screw 26 is used for laying a steel backing plate 25, the square head screw 26 is rotated by using a T-shaped inner four-corner socket wrench, the heights of the middle plate 12 and the side plates 13 are adjusted up and down until the distance between the bottom of the plate and the isolation sliding layer 6 is 4cm-5cm, for example: 4cm, 4.5cm or 5cm; and the flatness between the tops of two adjacent plates is not more than 3 mm.

Referring to fig. 3 and 4, the self-stress slit 21 is processed in step S104-3.

Further, the gaps among the side plates 13, the middle plate 12, the isolation sliding layer 6 and the semi-rigid asphalt pavement in the self-stress joints 21 are sealed by building glue;

the self-stress joint connecting ribs 19 are welded in a one-to-one correspondence manner, the welding length is not less than 10 times of the diameter of the steel bar, and the self-stress joint stirrups 20 are bound;

fully wetting the concrete at the side plate end of the self-stress joint 21 by clear water;

high expansion concrete 15 is poured, preferably at an expansion dose of 8% to 12%, for example: 8%, 10% or 12%, followed by 5 days of covering with moisturizing cotton;

the high expansion concrete 15 in the self-stress slit 21 expands to apply stress to the ends of the middle plate 12 and the side plates 13, so that the stress compensation of the ends of the pre-tensioned precast slabs is completed, and the side plates 13, the plurality of middle plates 12 and the side plates 13 are arranged to form the assembled prestressed concrete lower layer 4 formed by connecting the self-stress slit 21.

After the stress slit 21 is finally set, step S105 is performed to perfuse the leveling layer 5. Referring to fig. 8, the step S105 further includes:

mixing emulsified asphalt mortar; preferably, the emulsified asphalt mortar may be mixed using a flat-mouth concrete mixer 30;

after being uniformly mixed, the blanking valve 34 is opened, and the emulsified asphalt mortar is discharged into the storage hopper 31 through the blanking opening 33 and the blanking hose 35 of the stirrer. The capacity of the storage hopper 31 is not less than 1 cube, the storage hopper 31 is connected with a filling hose 32, and the filling hose 32 is provided with a binding belt buckle 36. After the hopper 31 reaches 80% of capacity, the valve (i.e., the tie clip 36 of the filling hose 32) is opened and the asphalt mortar is poured into the slab bottom through the filling hole 24.

The pouring sequence is gradually poured from one end of the plate to the other until the pouring slurry is poured from the two sides of the plate and exceeds the bottom of the plate by 1cm-2 cm. Pouring the slurry beyond the plate bottom, indicating that the lower part is completely poured; too much excess over the bottom of the plate may result in waste of slurry and affect subsequent process steps, and is preferably 1cm to 2 cm. The whole leveling layer 5 needs to be poured once, and the middle part can not be stopped.

After the pouring is completed, the pouring hole 24 is closed by high-grade mortar.

Next, step S106 is performed to perform asphalt mortar joint treatment. Cleaning gaps between the assembled prestressed concrete pavement slab and other pavement connected with the assembled prestressed concrete pavement slab; filling the gaps with tar sands 10; and tamping the filled tar sand 10.

After that, step S107 is performed, and the adhesive layer 3 is laid.

Firstly, roughening an assembly type prestressed concrete lower layer 4 by using a roughening machine; then, cleaning the lower layer 4 of the assembled prestressed concrete, and fully drying the lower layer; finally, a modified emulsified asphalt adhesive layer 3 is sprayed on the lower layer 4 of the assembled prestressed concrete.

Finally, step S108 is executed, and the high-modulus asphalt concrete upper layer 2 is paved. Further, step S108 includes:

and S108-1, paving 3cm-5cm high-modulus asphalt concrete on the adhesive layer 3, and compacting. Preferably, the high modulus agent is incorporated in the high modulus asphalt concrete in an amount of 0.5% to 0.6%, for example: 0.5%, 0.55% or 0.6%.

Step S108-2, setting a lane marking.

The composite pavement structure can be paved through the steps S101-S108, and the composite pavement structure is durable, long in service life and high in safety.

Correspondingly, the invention also provides a maintenance method for damaging the semi-rigid asphalt pavement structure, which comprises the following steps: cutting and chiseling the damaged semi-rigid asphalt pavement 1; paving a composite pavement structure. It is noted that the composite pavement structure needs to be laid by the foregoing method of laying the composite pavement structure.

Preferably, the cutting and chiseling of the damaged semi-rigid asphalt pavement 1 further comprises:

the cutting size is determined according to the degree of damage of the semi-rigid asphalt pavement 1, and the cutting line 11 is defined. More preferably, the cutting size is: the length of the cut is the damaged length of the semi-rigid asphalt pavement 1, the width is the width of one lane, and the depth is the thickness of the asphalt-assembled prestressed concrete composite pavement structure for replacing the semi-rigid asphalt pavement 1. Further, a milling dimension is determined based on the cutting dimension, a milling line 39 is defined, and the semi-rigid asphalt pavement is milled with a milling machine. Preferably, the milling dimension is: the length of milling is the damaged length of the semi-rigid asphalt pavement 1, and the width is wider than the length of each side of the two original lane marking lines 38 to the outside by an S section, preferably 20cm-30cm, for example: 20cm, 25cm or 30cm; the depth is 3cm-5cm, for example: 3cm, 4cm or 5cm.

Performing a one-time cut on the semi-rigid asphalt pavement 1 according to the cutting size; then cutting the disposable cut semi-rigid asphalt pavement into a plurality of small blocks; finally, the semi-rigid asphalt pavement 1 is chiseled.

The invention has the following advantages: the construction of the base layer and the cushion layer does not need large machinery, and the influence on the traffic of the level crossing is small; the leveling layer is filled with cement emulsified asphalt mortar, so that the problem of stress concentration of the lower layer of the assembled prestressed concrete caused by the difficulty in attaching the prestressed pavement slab to the base layer is solved; the upper layer is composed of high-modulus asphalt concrete, and has strong deformation resistance; the assembled prestressed concrete lower surface layer is formed by connecting side plates, a plurality of middle plates and side plates through self-stress joints according to the arrangement mode of the side plates, the side plates and the middle plates are pretensioned precast plates with end stress compensation, and the side plates and the middle plates are used for carrying out stress reinforcement on the ends of the pretensioned precast plates through the self-stress tensioning device and the self-stress joints. Due to the existence of prestress and self-stress, the whole lower layer works seamlessly; the pavement structure has the function of isolating the reflective cracks of the base layer, reduces the maintenance times of the surface layer, has longer service life than the semi-rigid asphalt pavement structure, and fundamentally eliminates the traffic safety hidden trouble caused by rutting and transverse cracks.

Although the exemplary embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit of the invention and the scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while remaining within the scope of the present invention.

Furthermore, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. From the present disclosure, it will be readily understood by those of ordinary skill in the art that processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.

Claims (10)

1. A method of laying a composite pavement structure, the method comprising:

step S101, paving a broken stone cushion layer;

step S102, laying a lean concrete base layer;

step S103, paving an isolation sliding layer;

step S104, paving an assembled prestressed concrete lower layer; further, the method comprises the following steps:

step S104-1, prefabricating a side plate and a middle plate;

step S104-2, sequentially installing the side plates, the middle plates and the side plates from head to tail according to the sequence of the side plates; a gap of 18cm-22cm is reserved between the longitudinally adjacent plates and is used for setting a self-stress gap; reserving a gap of 2cm-3cm between the edge and the semi-rigid asphalt pavement at the two sides;

step S104-3, processing the self-stress joint;

step S105, pouring a leveling layer;

step S106, asphalt mortar joint treatment;

step S107, paving an adhesive layer;

and S108, paving a high-modulus asphalt concrete upper layer.

2. The maintenance method according to claim 1, wherein the step S103 further comprises:

step S103-1, sprinkling emulsified asphalt on the lean concrete base layer;

step S103-2, paving a layer of geotextile on the emulsified asphalt;

step S103-3, paving double-layer plastic cloth on the geotextile;

and step S103-4, smearing lubricating oil between the double-layer plastic cloths.

3. The maintenance method according to claim 1, wherein the side plates and the middle plate have a width of 4cm to 6cm, a thickness of 16cm to 24cm, and a length of 6m to 9m narrower than one lane; the design label is 35MPa-45MPa; the steel strands are uniformly distributed at the position 1cm below the steel strands in the plate;

two ends of the middle plate are provided with double-layer self-stress seam connecting ribs which are in one-to-one correspondence and uniformly distributed;

the outer side end part of the side plate is provided with a self-stress tensioning device and high-expansion concrete, and the inner side end part of the side plate is provided with double-layer self-stress connecting ribs corresponding to the middle plate one by one.

4. The maintenance method according to claim 1, wherein the step S104-3 is further:

sealing the gaps among the side plates, the middle plate, the isolation sliding layer and the semi-rigid asphalt pavement in the self-stress joint by using building glue;

welding self-stress seam connecting ribs in one-to-one correspondence, and binding self-stress seam stirrups;

and pouring high-expansion concrete, wherein the expansion dosage of the high-expansion concrete is 8% -12%.

5. The maintenance method according to claim 1, wherein the step S105 further includes:

mixing emulsified asphalt mortar;

discharging the asphalt mortar into a storage hopper, and opening a valve after the storage hopper reaches 80% of capacity, wherein the asphalt mortar is poured into the bottom of the plate through a pouring hole;

and after the pouring is finished, the pouring hole is sealed by high-grade mortar.

6. The maintenance method according to claim 1, wherein the step S108 further includes:

s108-1, paving high-modulus asphalt concrete with the thickness of 3cm-5cm on the adhesive layer, and compacting;

step S108-2, setting a lane marking.

7. The method of repairing according to claim 6, wherein the high modulus agent is incorporated in the high modulus asphalt concrete in an amount of 0.5% to 0.6%.

8. A method of repairing a damaged semi-rigid asphalt pavement structure, the method comprising:

cutting and chiseling the damaged semi-rigid asphalt pavement;

paving a composite pavement structure;

the method for paving the composite pavement structure is characterized in that the composite pavement structure is paved by adopting the paving method of the composite pavement structure provided by any one of claims 1 to 7.

9. The method of repairing of claim 8, wherein said cutting and gouging the damaged semi-rigid asphalt pavement further comprises:

determining a cutting size according to the damage degree of the semi-rigid asphalt pavement;

determining a milling size according to the cutting size, and milling the semi-rigid asphalt pavement by using a milling machine;

performing one-time cutting on the semi-rigid asphalt pavement according to the cutting size;

cutting the disposable cut semi-rigid asphalt pavement into a plurality of small pieces;

and chiseling the semi-rigid asphalt pavement.

10. A maintenance method according to claim 9, wherein,

the cutting size is as follows:

the length of the cut is the damaged length of the semi-rigid asphalt pavement, the width of the cut is the width of one lane, and the depth of the cut is the thickness of the asphalt-assembled prestressed concrete composite pavement for replacing the semi-rigid asphalt pavement;

the milling dimension is as follows:

the length of milling is the damaged length of the semi-rigid asphalt pavement, the width of the milling is 20cm-30cm wider than each side of the original lane, and the depth of the milling is 3cm-5cm.