A pavement structure composed of a self-stressing joint and a pre-tensioned precast slab

Abstract

The present invention discloses a pavement structure composed of a self-stressing joint and a pre-tensioned slab. The pavement structure includes: an isolation layer, a fixed transition device, a double-ear waterproof expansion joint device, and a mixed stress road slab; the isolation layer is located between the pre-tensioned slab and the base layer, and includes a low-friction resistance isolation layer, a waterproof isolation layer, and a cement slurry layer; the pre-tensioned slab includes: side plates, sub-side plates, and middle plates; the fixed transition device is located between the asphalt surface layer and the double-ear waterproof expansion joint; the double-ear waterproof expansion joint device is located between the fixed plate and the side plates; the mixed stress road slab is located between two double-ear waterproof expansion joints and is formed by sequentially connecting side plates, multiple sub-side plates, and multiple middle plates in series. The above-mentioned multiple sub-side plates and middle plates are all connected by self-stressing joints. This pavement structure has simple technology, low maintenance cost, is not easy to crack, and has high quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of highway paving. Specifically, it relates to a pavement structure composed of self-stress joints and pre-tensioned slabs. Background Art

[0002] Traditional obliquely prestressed pavements need to be cast on-site, so they are greatly affected by the weather and the construction process is complex. For longitudinally tensioned cast-in-place prestressed pavements, due to the influence of prestressed ducts and frictional resistance at the bottom of the slab, the length of the pavement cannot be made too long. Therefore, there are many expansion joints arranged in the pavement, resulting in a low driving smoothness. Moreover, a post-cast strip needs to be made at the tensioning end, a sliding layer needs to be made under the precast slab, and the filler of the expansion joint is prone to aging and losing its viscosity and water permeability, which may lead to cracking at the joint between the prestressed pavement and the asphalt pavement.

[0003] In summary, the existing pavement structures mainly have the following defects: Traditional longitudinally prestressed pavements require on-site tensioning and grouting, and the process is complex; during operation, it is not easy to replace a single damaged slab, and the maintenance cost is high; the filler of the expansion joint is prone to aging, losing viscosity and water permeability, and it is easy to crack at the joint with the asphalt concrete pavement; due to the influence of prestressed ducts and frictional resistance at the bottom of the slab, the length of the pavement is limited.

[0004] Therefore, there is an urgent need for a pavement structure that can overcome the above defects. Summary of the Invention

[0005] In order to overcome the defects existing in the prior art, the present invention provides a pavement structure composed of self-stress joints and pre-tensioned slabs.

[0006] According to a specific embodiment of the present invention, there is provided a pavement structure composed of self-stress joints and pre-tensioned slabs, characterized in that the pavement structure includes: an isolation layer, a fixed transition device, a double-ear waterproof expansion joint device, and a hybrid stress road slab;

[0007] The isolation layer is located between the pre-tensioned slab and the base layer, and includes a low-friction isolation layer, a waterproof isolation layer, and a cement slurry layer; the pre-tensioned slab includes: side slabs, secondary side slabs, and middle slabs;

[0008] The fixed transition device is located between the asphalt surface layer and the double-ear waterproof expansion joint, and is composed of a fixed plate and a rigid-flexible transition plate;

[0009] The double-ear waterproof expansion joint device is located between the fixed plate and the side slab, and is composed of a filler joint surrounded by the fixed plate and the side slab, a joint filler, a pre-embedded steel pipe, a water-proof expansion ball, and a sleeper beam;

[0010] The mixed stress road slab, located between two double-ear waterproof expansion joints, is formed by sequentially connecting side plates, multiple sub-side plates, and multiple middle plates in series. Self-stress connecting joints are used to connect the multiple sub-side plates and middle plates.

[0011] According to a specific embodiment of the present invention,

[0012] The low-friction resistance isolation layer is arranged between the side plate, sub-side plate, and the base layer;

[0013] The waterproof isolation layer is arranged between the middle plate and the base layer.

[0014] According to another specific embodiment of the present invention,

[0015] The low-friction resistance isolation layer is composed of an asphalt concrete layer, an emulsified asphalt tack coat, and a high-strength PVC plastic plate;

[0016] The waterproof isolation layer is composed of an asphalt concrete layer, an emulsified asphalt tack coat, and a two-layer-one-membrane geotextile.

[0017] According to yet another specific embodiment of the present invention,

[0018] In the low-friction resistance isolation layer, the thickness range of the asphalt concrete layer is 3 cm - 5 cm, and the thickness of the high-strength PVC plastic plate is 3 mm;

[0019] In the waterproof isolation layer, the thickness range of the asphalt concrete layer is 3 cm - 5 cm, and the thickness range of the two-layer-one-membrane geotextile is 2 mm - 3 mm.

[0020] According to yet another specific embodiment of the present invention,

[0021] The fixing plate is provided with circular holes, and the diameter range of the circular holes is 15 cm - 20 cm;

[0022] The rigid-flexible transition plate is 3 meters long longitudinally, and the width is between 3.5 m - 7.5 m.

[0023] According to yet another specific embodiment of the present invention,

[0024] According to the different magnitudes and positions of the stress, the self-stress connecting joints are divided into self-stress connecting joint one and self-stress connecting joint two;

[0025] The self-stress of the self-stress connecting joint one is greater than the self-stress of the self-stress connecting joint two.

[0026] According to yet another specific embodiment of the present invention,

[0027] The prestresses of the side plate and the sub-side plate are both greater than the prestress of the middle plate.

[0028] According to another specific embodiment of the present invention,

[0029] The prestress value range of the side plate is 1.0 mpa - 2.8 mpa;

[0030] The prestress value range of the secondary side plate is 1.0 mpa - 2.8 mpa;

[0031] The prestress value range of the middle plate is 0.7 mpa - 2.5 mpa;

[0032] The stress value range of the self-stress connection joint is 3 mpa - 5 mpa.

[0033] According to another specific embodiment of the present invention,

[0034] The self-stress connection joint is composed of double-layer self-stress steel bars and expansive steel fiber concrete;

[0035] The double-layer self-stress steel bars are perpendicularly arranged to the end section of the pretensioned precast slab and symmetrically distributed.

[0036] According to another specific embodiment of the present invention,

[0037] The self-stress steel bars are grade-II steel bars with a diameter range between 12 mm and 18 mm;

[0038] The content of the high-efficiency expansive agent in the expansive steel fiber concrete is 10% - 12%.

[0039] In the pavement structure claimed by the present invention, the self-stress and prestress act alternately longitudinally and run through between the double-ear waterproof expansion joints, avoiding the problems of on-site tensioning and grouting in traditional longitudinally prestressed pavements; the process is simple and the cost is low, without cement slurry pollution; it is easy to replace a single damaged slab and the maintenance cost is low; the double-ear waterproof expansion joint device solves the problems of aging, loss of adhesion and easy water penetration of the filler in the filler type expansion joint; the fixed transition device solves the problem of easy cracking of the asphalt concrete pavement in the rigid-flexible transition section; the low friction resistance isolation layer reduces the friction resistance between the pretensioned precast slab and the pavement base, which is beneficial to the expansion and contraction of the side plate and the secondary side plate, and at the same time reduces the stress concentration at the bottom of the slab; the stress selection ranges of the side plate, the secondary side plate and the middle plate not only ensure a long service life and good practicability but also take into account the economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious:

[0041] Figure 1 Shown is a longitudinal sectional schematic diagram of a pavement structure composed of a self-stress connection joint and a pretensioned precast slab provided by the present invention;

[0042] Figure 2 The following shows a schematic structural view of the fixed transition device in the present invention;

[0043] Figure 3 The following shows a schematic structural view of the double-ear waterproof expansion joint in the present invention;

[0044] Figure 4 The following shows a connection schematic diagram of the self-stress connection joint and the pre-tensioned precast slab in the present invention.

[0045] Identical or similar reference numerals in the drawings represent identical or similar components.

[0046] The reference numerals are as follows:

[0047] 1, asphalt surface course; 2, isolation layer; 3, base course; 4, sub-base course; 5, fixed plate; 6, side plate; 7, cast-in-place rigid-flexible transition plate; 8, double-ear waterproof expansion joint; 9, anchor pile; 10, sleeper beam; 11, secondary side plate; 12, middle plate; 13, self-stress connection joint 1; 14, self-stress connection joint 2; 15, sealant; 16, embedded steel pipe; 17, anchoring steel bar; 18, polyurethane foam; 19, tarpaulin; 20, water-proof and permeable-proof expansion ball; 21, low friction resistance isolation layer; 22, waterproof isolation layer; 23, tie bar steel bar; 24, single-layer steel mesh of rigid-flexible transition plate; 25, double-layer steel mesh of sleeper beam; 26, main reinforcement of anchor pile; 27, stirrup of anchor pile; 28, pre-tensioned precast slab; 29, self-stress connection joint; 30, self-stress steel bar; 31, stirrup; 32, embedded steel bar; 33, steel strand; 34, two-film-one-cloth geotextile; 35, steel fiber expanded concrete; 36, cement slurry layer; 37, asphalt concrete layer; 38, emulsified asphalt tack coat; 39, high-strength PVC plastic plate. Embodiment

[0048] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and settings of specific examples are described below. In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. It should be noted that the components illustrated in the drawings are not necessarily drawn to scale. The present invention omits the description of well-known components and processing techniques and processes to avoid unnecessarily limiting the present invention.

[0049] Refer to Figure 1 and Figure 2 , the present invention provides a pavement structure composed of a self-stress connection joint 29 and a pre-tensioned precast slab 28. The pavement structure includes: an isolation layer 2, a fixed transition device, a double-ear waterproof expansion joint device, and a hybrid stress road slab.

[0050] The isolation layer 2 is located between the precast pretensioned slab 28 and the base layer 3, and includes a low-friction isolation layer 21, a waterproof isolation layer 22, and a cement slurry layer 36. The precast pretensioned slab 28 includes: side plates 6, secondary side plates 11, and middle plates 12.

[0051] Specifically, the low-friction isolation layer 21 is disposed between the side plates 6, secondary side plates 11, and the base layer 3; the waterproof isolation layer 22 is disposed between the middle plates 12 and the base layer 3; the cement slurry layer 36 is disposed below the fixing plate 5. Since temperature fluctuations can cause the side plates 6 and secondary side plates 11 to slide longitudinally on the road, the present invention provides a low-friction isolation layer 21 between the side plates 6, secondary side plates 11 and the base layer 3 to reduce or even eliminate the longitudinal sliding of the side plates 6 and secondary side plates 11 on the road, making the road surface structure more stable. The middle plates 12 are not easily affected by external factors and move, so it is preferable to provide a waterproof isolation layer 22 between the middle plates 12 and the base layer 3 to further extend the service life of the road surface structure.

[0052] Preferably, the low-friction isolation layer 21 is composed of an asphalt concrete layer 37, an emulsified asphalt tack coat 38, and a high-strength PVC plastic plate 39. If the thickness of the asphalt concrete layer 37 in the low-friction isolation layer 21 is too thick, the cost will increase significantly, and if it is too thin, it will not play a role in reducing stress concentration at the bottom of the slab. Therefore, preferably, the thickness range of the asphalt concrete layer 37 in the low-friction isolation layer 21 is 3 cm - 5 cm, for example: 3 cm, 4 cm, or 5 cm. Preferably, the thickness of the high-strength PVC plastic plate 39 is 3 mm.

[0053] The waterproof isolation layer 22 is composed of an asphalt concrete layer 37, an emulsified asphalt tack coat 38, and a two-layer one-film geotextile 34. A thicker asphalt concrete layer 37 in the waterproof isolation layer 22 can play a better role in reducing stress concentration at the bottom of the slab, but a too high thickness will significantly increase the production cost, so the thickness of the asphalt concrete layer 37 needs to be controlled; if the thickness is too thin, it will not play a role in reducing stress concentration at the bottom of the slab. Therefore, preferably, the thickness range of the asphalt concrete layer 37 in the waterproof isolation layer 22 is 3 cm - 5 cm, for example: 3 cm, 4 cm, or 5 cm. The thickness range of the two-layer one-film geotextile 34 is 2 mm - 3 mm, for example: 2 mm, 2.5 mm, or 3 mm.

[0054] The fixed transition device is located between the asphalt surface layer 1 and the double-ear waterproof expansion joint 8, and is composed of a fixing plate 5 and a rigid-flexible transition plate 7. To increase the firmness of the fixed transition device, an anchor pile 9 is also included.

[0055] Preferably, the fixed plate 5 is a pre-tensioned precast slab with six circular holes for anchoring. The diameter range of the circular holes is 15 cm - 20 cm, for example: 15 cm, 18 cm or 20 cm. The diameter range of the circular holes is related to the asphalt pavement structure layer. The thicker the asphalt pavement structure layer, the larger the diameter of the circular holes; the thinner the asphalt pavement structure layer, the smaller the diameter of the circular holes. The rigid-flexible transition plate 7 is 3 meters long longitudinally, and the width is between 3.5 m - 7.5 m, for example: 3.5 m, 4.6 m or 7.5 m.

[0056] The anchor pile 9 is a reinforced concrete pile cast in-situ between the bottom of the subbase 4 and the top of the road surface to anchor the fixed plate 5 to the base course 3. The anchor pile 9 fixes the fixed plate 5 to the base course 3, and the fixed plate 5 will not move longitudinally along with the temperature change on the road, thus ensuring a certain width of the double-ear waterproof expansion joint 8. The reinforced concrete pile is composed of anchor pile main bars 26 and anchor pile stirrups 27. The vertical reinforcement (anchor pile main bars 26) of the anchor pile 9 is 6 B14 - 16 deformed bars, and the anchor pile stirrups 27 are Φ8.

[0057] The cast-in-situ rigid-flexible transition plate 7 is a reinforced concrete special-shaped plate structure with a stepped upper part and an inclined lower part, which is bolted to the fixed plate 5 and cast integrally between the subbase 4 and the asphalt surface course 1. Preferably, the cast-in-situ rigid-flexible transition plate 7 is 3 meters long longitudinally, and the width is the same as that of the fixed plate 5. The tie bars 23 are Φ20 - 22 grade I steel bars, the concrete grade is 30 - 35, and a single-layer rigid-flexible transition plate steel mesh 24 with longitudinal B22 and transverse B16 is arranged in the middle.

[0058] See Figure 3 , the double-ear waterproof expansion joint device is located between the fixed plate 5 and the side plate 6, and is composed of a packing joint surrounded by the fixed plate 5 and the side plate 6, sealant 15, embedded steel pipe 16, water-proof permeable expansion ball 20 and sleeper beam 10.

[0059] The packing joint with a double-ear waterproof expansion joint structure is a gap left between the fixed plate 5 and the side plate 6 that can expand and contract according to temperature. Preferably, the distance is 2 cm - 3 cm. One-third of the lower part of the sealant 15 is filled with polyurethane foam 18, and the other parts are filled with a waterproof and expandable material, for example: modified asphalt, polyurethane asphalt, silicone-modified polyurethane asphalt. Preferably, the above-mentioned waterproof and expandable material is silicone-modified polyurethane asphalt. In the actual application process, due to the influence of various factors such as temperature and humidity, the packing joint may shrink or age, and the waterproof double-ear structure adopted in the present invention effectively prevents the infiltration of surface water.

[0060] Embedded steel pipes 16 with anchoring steel bars 17, which account for three-quarters of the volume, are embedded at the ends of the precast side plates 6 and the fixed plates 5. Preferably, the diameter of the embedded steel pipes 16 is 3 cm - 4 cm, for example: 3 cm, 3.5 cm or 4 cm. The pouring material is poured into the retractable water-proof expansion ball 20 inside the embedded steel pipes 16.

[0061] The sleeper beam 10 is a rectangular reinforced concrete slab that bears the force of the side plate 6 on the lower base layer 4 of the double-ear waterproof expansion joint 8. A double-layer steel mesh 25 of the sleeper beam is arranged inside the sleeper beam 10, and a double-layer felt 19 for preventing stress concentration is also laid on the sleeper beam 10. Preferably, the longitudinal length of the sleeper beam 10 is 2 m - 3 m, for example: 2 m, 2.5 m or 3 m. Preferably, the height of the sleeper beam 10 is 20 cm - 25 cm, for example: 20 cm, 23 cm or 25 cm. The width of the sleeper beam 10 is 20 cm more than each side of the fixed plate 5. The concrete grade of the sleeper beam 10 is 35 - steel grade.

[0062] The mixed stress road surface slab, located between two double-ear waterproof expansion joints, is sequentially connected in series by the side plates 6, multiple secondary side plates 11 and multiple middle plates 12. Self-stress connecting joints 29 are used to connect the multiple secondary side plates 11 and middle plates 12. The self-stress of the self-stress connecting joints 29 and the prestress of the pre-tensioned precast slab 28 act longitudinally alternately and run through between the two double-ear waterproof expansion joints 8.

[0063] All the side plates 6, secondary side plates 11, middle plates 12 and self-stress connecting joints 29 have the same dimensions except for the longitudinal dimensions. The longitudinal dimensions of the side plates 6, secondary side plates 11 and middle plates 12 are the same. Preferably, the longitudinal length of the side plates 6, secondary side plates 11 and middle plates 12 is 6.0 m - 9.0 m, for example: 6.0 m, 7.5 m or 9.0 m. The longitudinal length of the self-stress connecting joint 29 is 16 cm - 20 cm, for example: 16 cm, 18 cm or 20 cm. The width and height of the self-stress connecting joint 29 are the same as those of the pre-tensioned precast slab 28. The pre-tensioned precast slab 28 is 3.0 m - 3.5 m long along the road longitudinally, for example: 3.0 m, 3.2 m or 3.5 m; 3.5 m - 7.5 m wide transversely, for example: 3.5 m, 5 m or 7.5 m; and 16 cm - 24 cm high, for example: 16 cm, 20 cm or 24 cm.

[0064] Because the late loss of self-stress is relatively large, the self-stress of the self-stress connecting joint 29 is much greater than the prestress of the pre-tensioned precast slab 28, and the minimum initial value is not less than 3 mpa.

[0065] According to the different stress magnitudes and positions, the self-stress connecting joint 29 is divided into the first self-stress connecting joint 13 and the second self-stress connecting joint 14. Preferably, the stress value range of the self-stress connecting joint 29 is 3 mpa - 5 mpa, for example: 3 mpa, 4 mpa or 5 mpa. As mentioned above, the increase or decrease in temperature will cause the sliding of the side plate 6 and the secondary side plate 11 relative to the base layer 3, with an additional frictional resistance compared to the middle plate 12. Therefore, the self-stress of the first self-stress connecting joint 13 is greater than that of the second self-stress connecting joint 14.

[0066] Preferably, the prestresses of the side plate 6 and the secondary side plate 11 are both greater than that of the middle plate 12. The stress selection ranges of the side plate, secondary side plate, and middle plate take into account the service life and other practical performances while considering economy. If the stress value is too small, cracks are likely to occur in the precast slab, affecting its service life; if it is too large, more steel strands are required for reinforcement, which is uneconomical. Among them, the prestress value range of the side plate 6 is 1.0 mpa - 2.8 mpa, for example: 1.0 mpa, 2.0 mpa or 2.8 mpa. The prestress value range of the secondary side plate 11 is 1.0 mpa - 2.8 mpa, for example: 1.0 mpa, 2.0 mpa or 2.8 mpa. The prestress value range of the middle plate 12 is 0.7 mpa - 2.5 mpa, for example: 0.7 mpa, 2.0 mpa or 2.5 mpa.

[0067] See Figure 4 , when the pretensioned precast slab 28 is precast, prestressing tendons are arranged in the middle. Preferably, the prestressing tendons are 1860 mpa steel strands 33. The concrete grade used for the pretensioned precast slab 28 is 40 mpa - 45 mpa.

[0068] The self-stress connecting joint 29 is composed of double-layer self-stress steel bars 30 and expansive steel fiber concrete 35. The double-layer self-stress steel bars 30 are perpendicular to the end cross-section of the pretensioned precast slab 28 and are symmetrically arranged. Specifically, both ends of the self-stress steel bars 30 are embedded steel bars 32, and the embedded steel bars 32 are embedded in the pretensioned precast slab 28. The above double-layer self-stress steel bars 30 are connected by stirrups 31. The double-layer self-stress steel bars 30 are grade-II steel bars arranged in symmetric double rows with the same model and diameter. Such an arrangement can enable the expansive concrete to expand and tension the self-stress steel bars 30, so that the self-stress steel bars 30 generate uniform stress on the cross-section of the self-stress connecting joint 29. Preferably, the self-stress steel bars 30 are grade-II steel bars with a diameter range of 12 mm - 18 mm; the diameter can be: 12 mm, 15 mm or 18 mm. The content of the high-efficiency expansive agent in the expansive steel fiber concrete 35 is 10% - 12%, for example: 10%, 11% or 12%.

[0069] In the present invention, the side plates, secondary side plates and middle plates adopt precast plates by the pretensioning method. The precast plates are sequentially connected by self-stressing joints in the order of side plates, multiple secondary side plates and multiple middle plates. The high-efficiency expansive agent in the self-stressing joint concrete reacts with cement and water, and the expansion of the concrete tensions the steel bars to generate self-stress. The alternating action of self-stress and prestress forms a stress structure with stress penetrating the whole longitudinally in the entire road surface, achieving the same effect as a longitudinally prestressed road surface; however, on-site tensioning and grouting are not required, the road surface structure can be made longer, no post-cast strip needs to be poured, the temperature expansion and contraction are controlled at the road end part, and only sliding isolation layers are made under the side plates and secondary side plates to reduce the frictional resistance. The road surface construction is less affected by the weather, the process is simple, and it is green and environmentally friendly. The waterproof expansion ball of the expansion joint device can ensure that the expansion joint is tightly combined and waterproof after the filler ages and its viscosity decreases. The fixed transition device can keep the position of the road surface end fixed when the asphalt road surface expands and contracts due to temperature changes, which not only ensures that there is no cracking at the rigid-flexible joint, but also ensures that the deformation amount of the waterproof expansion joint is not affected.

[0070] Although the exemplary embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made to these embodiments without departing from the spirit of the present invention and the scope of protection defined by the appended claims. For other examples, those of ordinary skill in the art should easily understand that the order of the process steps can be changed while maintaining the scope of protection of the present invention.

[0071] In addition, the scope of application of the present invention is not limited to the processes, mechanisms, manufacturing, material compositions, means, methods and steps of the specific embodiments described in the specification. From the disclosure of the present invention, those of ordinary skill in the art will easily understand that for the processes, mechanisms, manufacturing, material compositions, means, methods or steps that already exist or will be developed in the future, and which perform substantially the same functions or achieve substantially the same results as the corresponding embodiments described in the present invention, they can be applied in accordance with the present invention. Therefore, the appended claims of the present invention are intended to include these processes, mechanisms, manufacturing, material compositions, means, methods or steps within their scope of protection.

Claims

1. A pavement structure composed of a self-stressing joint and a pre-tensioned precast slab, characterized in that, The pavement structure includes: an isolation layer, a fixed transition device, a double-ear waterproof expansion joint device, and a mixed stress road slab; The isolation layer is located between the pretensioned slab and the base course, and includes a low friction resistance isolation layer, a waterproof isolation layer, and a cement slurry layer; The pretensioned slab includes: side slabs, secondary side slabs, and middle slabs; The fixed transition device is located between the asphalt surface course and the double-ear waterproof expansion joint, and is composed of a fixed plate and a rigid-flexible transition plate; The double-ear waterproof expansion joint device is located between the fixed plate and the side slab, and is composed of a packing joint surrounded by the fixed plate and the side slab, caulking material, embedded steel pipes, a water-proof permeable expansion ball, and a sleeper beam; The mixed stress road slab is located between two double-ear waterproof expansion joints, and is formed by sequentially connecting side slabs, multiple secondary side slabs, and multiple middle slabs in series. Self-stress connecting joints are used to connect between the multiple secondary side slabs and middle slabs; The low friction resistance isolation layer is arranged between the side slabs, secondary side slabs, and the base course; The waterproof isolation layer is arranged between the middle slabs and the base course.

2. The pavement structure according to claim 1, wherein The low friction resistance isolation layer is composed of an asphalt concrete layer, an emulsified asphalt tack coat, and a high-strength PVC plastic plate; The waterproof isolation layer is composed of an asphalt concrete layer, an emulsified asphalt tack coat, and a two-layer-one-film geotextile.

3. The pavement structure according to claim 2, wherein The thickness range of the asphalt concrete layer in the low friction resistance isolation layer is 3 cm - 5 cm, and the thickness of the high-strength PVC plastic plate is 3 mm; The thickness range of the asphalt concrete layer in the waterproof isolation layer is 3 cm - 5 cm, and the thickness range of the two-layer-one-film geotextile is 2 mm - 3 mm.

4. The pavement structure according to claim 1, wherein Circular holes are provided on the fixed plate, and the diameter range of the circular holes is 15 cm - 20 cm; The rigid-flexible transition plate is 3 meters long longitudinally, and the width is between 3.5 m and 7.5 m.

5. The pavement structure according to claim 1, wherein According to the stress magnitude and position, the self-stress connecting joint is divided into self-stress connecting joint one and self-stress connecting joint two; The self-stress of the self-stress connecting joint one is greater than the self-stress of the self-stress connecting joint two.

6. The pavement structure according to claim 5, wherein The prestresses of the side slabs and secondary side slabs are both greater than the prestress of the middle slabs.

7. The pavement structure according to claim 6, wherein The prestress value range of the side slabs is 1.0 mpa - 2.8 mpa; The prestress value range of the secondary side slabs is 1.0 mpa - 2.8 mpa; The prestress value range of the middle slabs is 0.7 mpa - 2.5 mpa; The stress value range of the self-stress connecting joint is 3 mpa - 5 mpa.

8. The pavement structure according to claim 1, wherein The self-stress connecting joint is composed of double-layer self-stress steel bars and expansive steel fiber concrete; The double-layer self-stress steel bars are perpendicular to the end cross-section of the pretensioned slab and are symmetrically arranged.

9. The pavement structure according to claim 8, wherein The self-stressing steel bars are grade II steel bars with a diameter ranging from 12 mm to 18 mm; The content of the high-efficiency expansive agent in the expansive steel fiber concrete is 10% - 12%.

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