CN112962383A

CN112962383A - Asphalt pavement structure capable of preventing crack propagation and construction method

Info

Publication number: CN112962383A
Application number: CN202110199560.4A
Authority: CN
Inventors: 卢林
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-22
Filing date: 2021-02-22
Publication date: 2021-06-15

Abstract

The invention relates to an asphalt pavement structure for preventing crack propagation and a construction method. The asphalt pavement structure comprises a base layer, an old surface layer arranged on the base layer and a new surface layer arranged on the old surface layer; slotting at the gap on the old surface layer to the base layer to form a I-shaped groove, and arranging a seam stopping structure in the I-shaped groove; a connecting hole for connecting the seam stopping structure is formed in the old surface layer; a connecting rod is arranged in the connecting hole; and an anti-congestion device is arranged between the old surface layer and the new surface layer. According to the invention, the slot is provided with the seam stopping structure at the seam, so that the problem of upward reflection of the through seam is effectively solved; the arranged anti-congestion device effectively relieves the generation of new pavement congestion diseases; the connecting rod that sets up is connected basic unit, only sews the structure and old surface course as whole, strengthens road surface structure's wholeness and intensity, guarantees that road surface structure is not fragile.

Description

Asphalt pavement structure capable of preventing crack propagation and construction method

Technical Field

The invention belongs to the technical field of road engineering, and particularly relates to an asphalt pavement structure for preventing crack propagation and a construction method.

Background

Common road structures include cement concrete pavements and asphalt concrete pavements, and compared with cement concrete pavements, asphalt concrete pavements have the advantages of better driving comfort, lower noise and the like. In order to reduce noise and improve driving comfort, the reconstruction of cement concrete pavements into asphalt concrete pavements has become one of the key tasks in road engineering construction at the present stage. The method for additionally paving the asphalt concrete surface layer on the original cement concrete pavement can effectively utilize the original cement concrete pavement and shorten the construction period. However, the surface layer of the common cement concrete pavement has more gaps, such as: prevent the transverse joints of dry shrinkage cutting, construction joints generated by discontinuous construction, cracks generated by the damage of concrete panels and the like. During the service period of the road structure, the various gaps can become weak links, so that the durability of the road structure is influenced. For example, the crack is more easily corroded by rainwater, and the cushion layer and the base layer at the crack are quickly damaged, so that the pavement structure is damaged. At present, although certain measures are taken in the process of modifying the additionally paved asphalt concrete on a cement concrete pavement, the following problems still need to be solved:

1. in the current treatment measures, waterproof coiled materials or geotextiles are generally paved after concrete panels are milled, so that the occurrence of reflection cracks is reduced. However, the adhesion between asphalt concrete and cement concrete is affected by the laying of the waterproof roll or the geotextile, and the diseases such as hugging and moving easily occur under the action of vehicle load. And the waterproof coiled material and the geotextile are easy to be damaged at the contact part with the aggregate and gradually lose the function.

2. Pouring polyurethane or asphalt into the slots of various gaps has also become a common method for treating gaps. However, under the action of moisture erosion and vehicle loads, the grouting material is easily separated from the concrete panel, and the repairing and caulking effects are lost. Whether laying isolation or pouring plugging is adopted, the method is only a treatment method for treating symptoms and not root causes, and the effect is easily lost after a period of time.

3. The asphalt concrete surface layer is additionally paved on the cement concrete pavement, the bonding and compounding effects of the asphalt concrete surface layer and the cement concrete pavement are poor, and the diseases such as the dense package and the like are easy to occur under the action of vehicle load. At present, measures for enhancing the composite effect mainly comprise spreading the bond oil and napping treatment on the cement concrete pavement, and the spreading of the bond oil and the napping treatment have no obvious effect on enhancing the bonding effect.

4. At present, most of treatment of additionally paved asphalt concrete surface layers is concentrated on the concrete surface layers, and after the cement concrete surface is used for a long time, particularly under various gaps, the problems of road surface void and the like caused by rainwater erosion, uneven settlement of a foundation or uneven compaction and the like are particularly obvious. And the void easily causes the surface layer structure to break, and influences the durability of the pavement structure.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide an asphalt pavement structure for preventing crack propagation and a construction method thereof.

The invention provides an asphalt pavement structure for preventing crack propagation, which comprises a base layer, an old surface layer and a new surface layer, wherein the old surface layer is arranged on the base layer; slotting at the gap on the old surface layer to the base layer to form a I-shaped groove, and arranging a seam stopping structure in the I-shaped groove; a connecting hole for connecting the seam stopping structure is formed in the old surface layer; an anti-hugging device is arranged on the old surface layer; the anti-hugging device consists of an embedded sheet and a fixed rod; mounting holes for mounting fixing rods are formed in the old surface layer; the seam stopping structure is composed of an upper flat plate, a vertical plate and a lower flat plate.

And a connecting rod is arranged in the connecting hole.

The anti-congestion device is arranged every 20-40 cm along the transverse direction of the road surface, and the anti-congestion device is arranged every 150-300 cm along the longitudinal direction of the road surface; every 3 ~ 5 along the anti device of hugging that the road surface transversely set up pass through the horizontal pole and link to each other, the horizontal pole welding is on the dead lever.

The horizontal projection of the embedded sheet is cross-shaped or rectangular or circular, and the thickness of the embedded sheet is 2-4 mm.

After the fixing rod is installed in the installation hole, the exposed height of the fixing rod is 1.5-2.5 times of the maximum particle size of the coarse aggregate in the new surface layer and is not more than 0.65 time of the thickness of the new surface layer; the fixed rod is connected with the embedded sheet in a welding mode.

The thickness of the upper flat plate is 0.35-0.6 times of that of the old surface layer and is not less than 8 cm.

The width of the vertical plate is 10-30 cm.

The thickness of the lower flat plate is 8-12 cm.

The length of the connecting rod inserted into the base layer is 10-20 cm; the length of the connecting rod inserted into the upper flat plate is 0.3-0.6 times of the thickness of the upper flat plate.

A construction method of an asphalt pavement structure for preventing crack propagation comprises the following steps:

step 1: grooving along the seam; grooving the old surface layer into the base layer along the gap on the old surface layer to obtain an I-shaped groove with the same shape and size as the seam stopping structure;

step 2: inspecting the base layer; checking whether the base layer below the I-shaped groove is empty; if the void exists, backfilling by adopting the same material as the base layer, and tamping to the same height as the lower surface of the lower flat plate; if no void exists, no treatment is carried out; the compaction degree of the tamped backfill part is not less than 96%;

and step 3: drilling and inserting a rod; drilling a hole on the old surface layer to obtain a connecting hole, and then inserting a connecting rod into the connecting hole to the base layer;

and 4, step 4: pouring and forming a seam stopping structure; pouring concrete in the I-shaped groove to obtain a seam stopping structure, and watering and maintaining for not less than 7 days;

and 5: installing an anti-hugging device; drilling a hole on the old surface layer to obtain a mounting hole, and then mounting the anti-hugging device on the old surface layer through a fixing rod; then welding cross rods on 3-5 adjacent fixing rods;

step 6: paving a new surface layer; and removing broken stones and dust on the old surface layer, spreading emulsified asphalt on the old surface layer, paving asphalt concrete, and rolling to form a new surface layer.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the slot is arranged at the gap on the old surface layer to form the gap stopping structure, and the original surface layer structures are connected into a whole, so that the bonding of asphalt concrete and cement concrete is not influenced, the weak area of the old surface layer structure can be eliminated, and the problem of upward reflection of the through crack is effectively solved.

2. The anti-hugging device provided by the invention can effectively enhance the composite bonding strength of the old surface layer and the new surface layer and effectively relieve the generation of the hugging disease of the new surface layer.

3. The connecting rod arranged in the invention connects the base layer, the seam stopping structure and the old surface layer into a whole, thereby obviously enhancing the integrity and the strength of the pavement structure. Along with the improvement of the integrity of the pavement structure, the pavement structure can be ensured not to be damaged easily under the long-term action of the erosion of moisture and the load of the vehicle.

4. The invention can adopt backfill and tamping treatment measures for the base layer void while treating the original cement concrete surface layer, is beneficial to delaying the occurrence of the problems of pavement structure cracks, void, fracture and the like, and enhances the durability of the pavement structure.

Drawings

FIG. 1 is a schematic structural view of an asphalt pavement of the present invention;

FIG. 2 is a schematic structural diagram of slot notching of an old surface layer according to the present invention;

fig. 3 is a schematic view of the distribution of the anti-congestion device of the present invention;

FIG. 4 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;

FIG. 5 is a schematic structural view of the seam-stopping structure of the present invention;

fig. 6 is a schematic structural diagram of an anti-congestion device according to the present invention;

FIG. 7 is a flow chart of the construction method of the present invention;

in the figure: 1 basic unit, 2 old surface courses, 3 new surface courses, 4 seam structures, 5 connecting holes, 6 anti dense package devices, 7 fillets, 8 dead levers, 9 mounting holes, 10 upper flat plates, 11 risers, 12 lower flat plates, 13 connecting rods, 14 horizontal rods, 15 gaps.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. An asphalt pavement structure for preventing crack propagation in this embodiment:

referring to fig. 1, in the present embodiment, the asphalt pavement structure includes a base course 1, an old surface course 2 provided on the base course 1, and a new surface course 3 provided on the old surface course 2; at the gap 15 on the old surface layer 2, a groove is formed downwards to the base layer 1 by taking the gap 15 as a central line to form an I-shaped groove, and concrete is poured in the I-shaped groove to form a seam stopping structure 4; the slot is arranged at the gap 15 to form the seam stopping structure 4, so that a weak area of an old surface layer 2 structure can be eliminated, the original surface layer structure is connected into a whole, the problem of crack transmission is effectively solved, and the seam stopping structure has important engineering application value.

Referring to fig. 4, in this embodiment, the cross section of the seam-stopping structure 4 is in a shape of a letter "h", and is clamped on the old surface layer 2; and a connecting hole 5 for connecting the seam stopping structure 4 is formed in the old surface layer 2.

Referring to fig. 5, in the present embodiment, the seam-stopping structure 4 is composed of an upper plate 10, a riser 11 and a lower plate 12. The upper plate 10 and risers 11 are located in the old face layer 2 and the lower plate 12 is located in the base layer 1. The seam-stopping structure 4 is manufactured by adopting concrete through one-time pouring forming.

Referring to fig. 3 and 6, in the present embodiment, an anti-congestion device 6 for connecting a new face layer 3 is provided on the old face layer 2; the anti-hugging device 6 is composed of an insert 7 and a fixed rod 8; the anti-hugging device 6 can effectively enhance the composite bonding strength of the old surface layer 2 and the new surface layer 3 and can effectively relieve the generation of the hugging disease of the new surface layer 3.

Referring to fig. 2, in this embodiment, a mounting hole 9 for mounting a fixing rod 8 is formed in the old surface layer 2.

In this embodiment, a connecting rod 13 is disposed in the connecting hole 5; the connecting holes 5 are arranged at intervals of 60-100 cm.

In the embodiment, the connecting rod 13 penetrates through the lower flat plate 12 and then is inserted into the base layer 1, and the length of the connecting rod 13 inserted into the base layer 1 is 10-20 cm; the length of the connecting rod 13 inserted into the upper flat plate 10 is 0.3-0.6 times of the thickness of the upper flat plate 10. The connecting rod 13 is a hot rolled ribbed bar with a nominal diameter of 12 or 14 mm. The connecting rod 13 connects the base layer 1, the seam stopping structure 4 and the old surface layer 2 into a whole, and the integrity and the strength of the pavement structure are obviously enhanced.

In this embodiment, the anti-congestion device 6 is arranged every 20-40 cm along the horizontal direction of the road surface, and the anti-congestion device 6 is arranged every 150-300 cm along the longitudinal direction of the road surface; every 3 ~ 5 along the horizontal anti hug device 6 that sets up of road surface link to each other through horizontal pole 14, horizontal pole 14 welds on dead lever 8. The longitudinal direction of the road surface refers to the direction in which vehicles travel along the road, and the transverse direction of the road surface refers to the direction perpendicular to the longitudinal direction of the road surface, i.e., the direction along the width of the road surface. And reserving the traveling track surfaces of the asphalt mixture transport vehicle and the paving vehicle when the anti-dense package device 6 is installed.

In this embodiment, the cross bar 14 and the fixing rod 8 are all smooth round steel bars with nominal diameter of 8 or 10 mm. The cross rod 14 connects 3-5 anti-hugging devices 6 into a whole, which can not only enhance the effect of the anti-hugging devices 6, but also reinforce the new surface layer 3. The distance of the cross bar 14 from the old facing 2 is not more than 2 cm.

In this embodiment, the horizontal projection of the insert 7 is cross-shaped or rectangular or circular, and the thickness of the insert 7 is 2-4 mm.

In the embodiment, after the fixing rod 8 is installed in the installation hole 9, the height of the fixing rod 8 exposed outside the old surface layer 2 is 1.5-2.5 times of the maximum particle size of coarse aggregates in the new surface layer 3 and is not more than 0.65 time of the thickness of the new surface layer 3; the fixing rod 8 is connected with the embedded sheet 7 in a welding mode.

In this embodiment, the distance between the center of the mounting hole 9 and the minimum straight line of the upper flat plate 10 is not less than 15 cm. The circle center of the mounting hole 9 is kept at a certain distance from the outer edge of the upper flat plate 10, so that the contact position of the upper flat plate 10 and the old surface layer 2 is protected from being damaged.

In this embodiment, the upper surface of the upper plate 10 and the upper surface of the old surface layer 2 are located on the same horizontal plane, that is, the upper surface of the upper plate 10 and the upper surface of the old surface layer 2 have the same height; the bottom planes of the vertical plates 11 and the lower surface of the old surface layer 2 are located on the same horizontal plane, namely the bottom planes of the vertical plates 11 and the lower surface of the old surface layer 2 are the same in elevation.

In the embodiment, the thickness of the upper flat plate 10 is 0.35-0.6 times of the thickness of the old surface layer 2 and is not less than 8 cm; the thickness of the lower flat plate 12 is 8-12 cm; the width of the vertical plate 11 is 10-30 cm.

Referring to fig. 7, in this embodiment, a method for constructing an asphalt pavement structure for preventing crack propagation includes the following steps:

step 1: grooving along the seam; slotting into the base layer 1 along the gap 15 on the old surface layer 2 to obtain an I-shaped slot with the same shape and size as the seam stopping structure 4;

step 2: inspecting the base layer; checking whether the base layer 1 below the I-shaped groove is empty; if the void exists, the base layer 1 is backfilled by the same material, and is tamped to the same height as the lower surface of the lower flat plate 12; if no void exists, no treatment is carried out; the compaction degree of the tamped backfill part is not less than 96%;

and step 3: drilling and inserting a rod; drilling a hole on the old surface layer 2 to obtain a connecting hole 5, and then inserting a connecting rod 13 into the connecting hole 5 to the base layer 1;

and 4, step 4: pouring and forming a seam stopping structure; pouring concrete in the I-shaped groove to obtain a seam-stopping structure 4, and watering and maintaining for not less than 7 days; each seam-stopping structure 4 is poured once;

and 5: installing an anti-hugging device; drilling a hole in the old surface layer 2 to obtain a mounting hole 9, and then mounting the anti-hugging device 6 on the old surface layer 2 through a fixing rod 8; then, 3-5 adjacent fixing rods 8 are selected to be welded with cross rods 14 along the transverse direction of the road surface;

step 6: paving a new surface layer; and removing broken stones and dust on the old surface layer 2, then spreading emulsified asphalt on the old surface layer 2, and then spreading asphalt concrete and rolling to form a new surface layer 3.

The invention can check whether the base layer below the gap is empty or not while treating the original cement concrete surface layer, and takes the measures of backfilling and tamping on the base layer, thereby being beneficial to delaying the occurrence of the problems of cracks, empty and fracture of the pavement structure and enhancing the durability of the pavement structure.

In this embodiment, the old surface layer 2 is an original cement concrete surface layer; the new surface course 3 is an asphalt concrete surface course paved on the old surface course 2, and the asphalt concrete surface course sequentially comprises an upper surface course, a middle surface course and a lower surface course from top to bottom.

In this embodiment, the gap 15 is a transverse gap for preventing dry shrinkage cutting, a construction gap generated by discontinuous construction, or a gap without dislocation due to the destruction of a concrete panel on the old surface layer 2.

Example 1

In the embodiment, the asphalt pavement structure comprises a base layer 1, an old surface layer 2 arranged on the base layer 1, and a new surface layer 3 arranged on the old surface layer 2; and (3) slotting at the gap 15 on the old surface layer 2 to the base layer 1 to form a I-shaped groove, and arranging a seam stopping structure 4 in the I-shaped groove. And a connecting hole 5 for connecting the seam stopping structure 4 is formed in the old surface layer 2. The seam-stopping structure 4 is composed of an upper flat plate 10, a vertical plate 11 and a lower flat plate 12. An anti-hugging device 6 is arranged between the old surface layer 2 and the new surface layer 3; the anti-hugging device 6 is constituted by an insert 7 and a fixing rod 8. And the old surface layer 2 is provided with a mounting hole 9 for mounting a fixing rod 8.

In this embodiment, a connecting rod 13 is disposed in the connecting hole 5; the connecting holes 5 are arranged one by one at intervals of 65 cm. The connecting rod 13 is a hot rolled ribbed bar with a nominal diameter of 12 mm.

In this embodiment, the anti-congestion device 6 is arranged every 25cm along the horizontal direction of the road surface, and the anti-congestion device 6 is arranged every 180cm along the vertical direction of the road surface; every 3 anti-hugging devices 6, placed transversely along the road surface, are connected by a cross-bar 14, said cross-bar 14 being welded to the fixing bars 8.

In this embodiment, the cross rod 14 and the fixing rod 8 are all smooth round steel bars with a nominal diameter of 8 mm. The distance of the cross bar 14 from the old facing 2 is 1 cm.

In this embodiment, the horizontal projection of the insert 7 is a cross, and the thickness of the insert 7 is 2.5 mm.

In the embodiment, after the fixing rod 8 is installed in the installation hole 9, the exposed height of the fixing rod 8 is 2 times of the maximum particle size of coarse aggregates in the new surface layer 3 and is not more than 0.65 time of the thickness of the new surface layer 3; the fixing rod 8 is connected with the embedded sheet 7 in a welding mode.

In this embodiment, the distance between the center of the mounting hole 9 and the minimum straight line of the upper flat plate 10 is 20 cm.

In this embodiment, the thickness of the upper flat plate 10 is 0.4 times of the thickness of the old surface layer 2 and is not less than 8 cm; the thickness of the lower flat plate 12 is 9 cm; the width of the vertical plate 11 is 20 cm.

In this embodiment, the connecting rod 13 penetrates through the lower plate 12 and is inserted into the base layer 1, and the length of the connecting rod inserted into the base layer 1 is 13 cm; the length of the connection rod 13 inserted into the upper plate 10 is 0.4 times the thickness of the upper plate 10.

In this embodiment, the asphalt pavement structure construction method is performed according to the following steps:

step 1: slotting into the base layer 1 along the gap 15 on the old surface layer 2 to obtain an I-shaped slot with the same shape and size as the seam stopping structure 4; the base layer 1 adopts artificial grooving;

step 2: the base layer 1 below the I-shaped groove is empty; backfilling with the same material as the base layer 1, and tamping to the same elevation as the lower surface of the lower flat plate 12; the compaction degree of the backfilled part after tamping is 96 percent;

and step 3: drilling a hole on the old surface layer 2 to obtain a connecting hole 5, and then inserting a connecting rod 13 into the connecting hole 5 to the base layer 1;

and 4, step 4: pouring concrete in the I-shaped groove to obtain a seam-stopping structure 4, and watering and curing for 14 days;

and 5: drilling a hole in the old surface layer 2 to obtain a mounting hole 9, and then mounting the anti-hugging device 6 on the old surface layer 2 through a fixing rod 8; then sequentially selecting 4 anti-congestion devices 6 transversely arranged along the road surface, and welding the cross rods 14 on the fixed rods 8 to connect the adjacent 4 anti-congestion devices 6 into a whole so as to enhance the effect of the anti-congestion devices 6;

step 6: and after the seam-stopping structure 4 is watered and maintained for 14 days, removing broken stones and dust on the old surface layer 2, then spreading emulsified asphalt on the old surface layer 2, and then spreading asphalt concrete and rolling to form a new surface layer 3.

Example 2

In this embodiment, a connecting rod 13 is disposed in the connecting hole 5; the connecting holes 5 are arranged every 80 cm. The connecting rod 13 is a hot rolled ribbed bar with a nominal diameter of 14 mm.

In this embodiment, the anti-congestion device 6 is arranged every 35cm along the horizontal direction of the road surface, and the anti-congestion device 6 is arranged every 250cm along the vertical direction of the road surface; every 4 anti-hugging devices 6 placed transversely along the road surface are connected by cross bars 14, said cross bars 14 being welded to the fixing bars 8.

In this embodiment, the cross bar 14 and the fixing rod 8 are all smooth round steel bars with a nominal diameter of 10 mm. The distance of the cross bar 14 from the old facing 2 is 2 cm.

In this embodiment, the horizontal projection of the insert 7 is rectangular, and the thickness of the insert 7 is 3 mm.

In the embodiment, after the fixing rod 8 is installed in the installation hole 9, the exposed height of the fixing rod 8 is 2.5 times of the maximum particle size of coarse aggregates in the new surface layer 3 and is not more than 0.65 time of the thickness of the new surface layer 3; the fixing rod 8 is connected with the embedded sheet 7 in a welding mode.

In this embodiment, the distance between the center of the mounting hole 9 and the minimum straight line of the upper flat plate 10 is 30 cm.

In this embodiment, the thickness of the upper flat plate 10 is 0.5 times of the thickness of the old surface layer 2 and is not less than 8 cm; the thickness of the lower flat plate 12 is 10 cm; the width of the vertical plate 11 is 25 cm.

In this embodiment, the connecting rod 13 penetrates through the lower plate 12 and is inserted into the base layer 1, and the length of the connecting rod inserted into the base layer 1 is 15 cm; the length of the connection rod 13 inserted into the upper plate 10 is 0.5 times the thickness of the upper plate 10.

step 1: slotting into the base layer 1 along the gap 15 on the old surface layer 2 to obtain an I-shaped slot with the same shape and size as the seam stopping structure 4;

step 2: drilling a hole on the old surface layer 2 to obtain a connecting hole 5, and then inserting a connecting rod 13 into the connecting hole 5 to the base layer 1;

and step 3: pouring concrete in the I-shaped groove to obtain a seam-stopping structure 4, and watering and maintaining for 10 days;

and 4, step 4: drilling a hole in the old surface layer 2 to obtain a mounting hole 9, and then mounting the anti-hugging device 6 on the old surface layer 2 through a fixing rod 8; then sequentially selecting 5 anti-congestion devices 6 transversely arranged along the road surface, and welding the cross rods 14 on the fixed rods 8 to connect 4 adjacent anti-congestion devices 6 into a whole so as to enhance the effect of the anti-congestion devices 6;

and 5: and after the seam-stopping structure 4 is watered and maintained for 10 days, removing broken stones and dust on the old surface layer 2, then spreading emulsified asphalt on the old surface layer 2, and then paving asphalt concrete and rolling to form a new surface layer 3.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a prevent bituminous paving structure of crack propagation which characterized in that: the asphalt pavement structure comprises a base layer (1), an old surface layer (2) arranged on the base layer (1), and a new surface layer (3) arranged on the old surface layer (2); slotting at the gap (15) on the old surface layer (2) to the base layer (1) to form a I-shaped groove, and arranging a seam stopping structure (4) in the I-shaped groove; a connecting hole (5) for connecting the seam stopping structure (4) is formed in the old surface layer (2); an anti-hugging device (6) is arranged on the old surface layer (2); the anti-hugging device (6) is composed of an embedded sheet (7) and a fixed rod (8); mounting holes (9) for mounting fixing rods (8) are formed in the old surface layer (2); the seam stopping structure (4) is composed of an upper flat plate (10), a vertical plate (11) and a lower flat plate (12).

2. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: and a connecting rod (13) is arranged in the connecting hole (5).

3. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: the anti-congestion device (6) is arranged along the transverse direction of the road surface at intervals of 20-40 cm, and the anti-congestion device (6) is arranged along the longitudinal direction of the road surface at intervals of 150-300 cm; every 3 ~ 5 along the anti dense package device (6) of the horizontal setting of road surface link to each other through horizontal pole (14), horizontal pole (14) welding is on dead lever (8).

4. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: the horizontal projection of the embedded sheet (7) is cross-shaped or rectangular or circular, and the thickness of the embedded sheet (7) is 2-4 mm.

5. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: after the fixing rod (8) is installed in the installation hole (9), the exposed height of the fixing rod (8) is 1.5-2.5 times of the maximum particle size of coarse aggregates in the new surface layer (3), and the exposed height of the fixing rod (8) is not more than 0.65 time of the thickness of the new surface layer (3); the fixing rod (8) is connected with the embedded sheet (7) in a welding mode.

6. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: the thickness of the upper flat plate (10) is 0.35-0.6 times of that of the old surface layer (2) and is not less than 8 cm.

7. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: the width of the vertical plate (11) is 10-30 cm.

8. The asphalt pavement structure for preventing crack propagation according to claim 1, wherein: the thickness of the lower flat plate (12) is 8-12 cm.

9. The asphalt pavement structure for preventing crack propagation according to claim 2, wherein: the length of the connecting rod (13) inserted into the base layer (1) is 10-20 cm; the length of the connecting rod (13) inserted into the upper flat plate (10) is 0.3-0.6 times of the thickness of the upper flat plate (10).

10. The asphalt pavement structure construction method for preventing crack propagation according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

step 1: grooving along the seam; slotting into the base layer (1) along the gap (15) on the old surface layer (2) to obtain an I-shaped groove with the same shape and size as the seam stopping structure (4);

step 2: inspecting the base layer; checking whether the base layer (1) below the I-shaped groove is empty; if the void exists, the base layer (1) is backfilled by the same material, and is tamped to the same height as the lower surface of the lower flat plate (12); if no void exists, no treatment is carried out; the compaction degree of the tamped backfill part is not less than 96%;

and step 3: drilling and inserting a rod; drilling a hole on the old surface layer (2) to obtain a connecting hole (5), and then inserting a connecting rod (13) into the connecting hole (5) to the base layer (1);

and 4, step 4: pouring and forming a seam stopping structure; pouring concrete in the I-shaped groove to obtain a seam stopping structure (4), and watering and maintaining for not less than 7 days;

and 5: installing an anti-hugging device; drilling a hole on the old surface layer (2) to obtain a mounting hole (9), and then mounting the anti-hugging device (6) on the old surface layer (2) through a fixing rod (8); then welding cross rods (14) on 3-5 adjacent fixing rods (8);

step 6: paving a new surface layer; and removing broken stones and dust on the old surface course (2), then spreading emulsified asphalt on the old surface course (2), and then spreading asphalt concrete and rolling to obtain a new surface course (3).