阅读说明：本技术 一种市政道路改造工程沥青路面搭接施工方法及搭接结构 (Municipal road reconstruction project asphalt pavement lap joint construction method and lap joint structure ) 是由 肖明明 蔡冬 朱朝辉 林杰辉 谢海高 秦贵忠 张慧 邓坤 陈一鸣 于 2020-06-12 设计创作，主要内容包括：本发明提供了一种市政道路改造工程沥青路面搭接施工方法及搭接结构。该搭接施工方法包括如下步骤：将旧路面的边部铣刨成阶梯状结构并清洁各层铣刨面；依次按照第一预设方式对旧路面的各层旧路面阶梯层进行处理,第一预设方式为：在旧路面阶梯层的一侧摊铺碎石以形成碎石基层并对其进行碾压后,对碎石基层进行养护并清理碎石基层表面的浮灰及杂物；依次按照第二预设方式对现状沥青路面的各层旧沥青阶梯层进行处理,第二预设方式为：在旧沥青阶梯层的一侧,摊铺沥青砼以形成沥青砼基层并对其进行碾压后,清理沥青砼基层的表面。本发明对新旧沥青路面结构的结合与拓宽施工,减少了新旧沥青路面结构连接处的不均匀沉降及反射裂缝。(The invention provides a municipal road reconstruction project asphalt pavement lap joint construction method and a lap joint structure. The lapping construction method comprises the following steps: milling the edge of the old pavement into a stepped structure and cleaning each layer of milled surface; each layer of old road surface ladder layer on old road surface is handled according to first preset mode in proper order, and first preset mode is: paving broken stones on one side of the old pavement step layer to form a broken stone base layer, rolling the broken stone base layer, maintaining the broken stone base layer, and cleaning floating ash and impurities on the surface of the broken stone base layer; processing each layer of old asphalt stepped layer of the current asphalt pavement according to a second preset mode in sequence, wherein the second preset mode is as follows: and paving asphalt concrete on one side of the old asphalt step layer to form an asphalt concrete base layer, rolling the asphalt concrete base layer, and cleaning the surface of the asphalt concrete base layer. The invention combines and expands the construction of the new and old asphalt pavement structures, and reduces the uneven settlement and the reflection cracks at the joints of the new and old asphalt pavement structures.)

1. A municipal road reconstruction project asphalt pavement lap joint construction method is characterized by comprising the following steps:

milling the edge of the old pavement into a stepped structure and cleaning each layer of milled surface;

each layer of old road surface ladder layer on old road surface is handled according to first preset mode in proper order, first preset mode is: paving broken stones on one side of the old pavement stepped layer to the top wall of the old pavement stepped layer to form a broken stone base layer, rolling the broken stone base layer, maintaining the broken stone base layer and cleaning floating ash and impurities on the surface of the broken stone base layer;

processing each layer of old asphalt stepped layer of the current asphalt pavement according to a second preset mode in sequence, wherein the second preset mode is as follows: one side of old pitch ladder layer, pave asphalt concrete extremely the roof of old pitch ladder layer is in order to form the asphalt concrete basic unit and roll it the back, clear up the surface of asphalt concrete basic unit.

2. The method for overlapping the asphalt pavement of the municipal road reconstruction project according to claim 1,

the old asphalt ladder layer is of a three-layer structure from bottom to top, and asphalt concrete paved on one side of the old asphalt ladder layer sequentially comprises the following components: coarse grain asphalt concrete, medium grain modified asphalt concrete and mixture of asphalt mastic and crushed stone.

3. The method for overlapping the asphalt pavement of the municipal road reconstruction project according to claim 1,

being to each layer in the step that old pitch ladder layer handled, except the superiors the old pitch ladder layer, other in the processing on old pitch ladder layer the clearance the surface back of pitch concrete basic unit still includes: and spreading emulsified asphalt binder oil on the surface of the asphalt concrete base layer to bond two adjacent asphalt concrete base layers.

4. The method for overlapping the asphalt pavement of the municipal road reconstruction project according to claim 1,

the old pavement step layer is of a three-layer structure from bottom to top, and the mass ratio of cement to the broken stone paved on one side of the old pavement step layer is 4%, 5% and 5% in sequence.

5. The method for the overlapping construction of the asphalt pavement of the town road modification works according to any one of claims 1 to 4,

in the step of handling each layer old road surface ladder layer, still include after rolling rubble basic unit and before the clearance maintenance: and paving and sticking geogrids on the top surface of the lap joint of the step layer of the old pavement and the crushed stone base layer.

6. The utility model provides a town road reforms transform engineering bituminous paving overlap joint structure which characterized in that includes: old road surface; wherein the content of the first and second substances,

the edge part of the old pavement is of a step-shaped structure and comprises a plurality of layers of old pavement step layers and a plurality of layers of old asphalt step layers arranged above the old pavement step layers;

each layer one side on old road surface ladder layer all is equipped with the rubble basic unit, and, each layer one side on old pitch ladder layer all is equipped with asphalt concrete basic unit.

7. The method for overlapping the asphalt pavement of the town road modification project according to claim 6,

the old pitch ladder layer is the three-layer, and the pitch concrete basic unit that its one side set up does in proper order: coarse grain type asphalt concrete layer, medium grain type modified asphalt concrete layer and asphalt mastic macadam mixed material layer.

8. The method for overlapping the asphalt pavement of the town road modification project according to claim 6,

and except the uppermost layer in the asphalt concrete base layer, the asphalt concrete base layer and the emulsified asphalt adhesive layer oil layer are arranged on the upper surface of the asphalt concrete base layer, so that the asphalt concrete base layers are bonded adjacently.

9. The method for overlapping the asphalt pavement of the town road modification project according to claim 6,

and each layer of the old pavement step layer and one side of the old pavement step layer are provided with geogrids on the top surface of the lap joint of the gravel base layer.

10. The method for the overlap construction of the asphalt pavement of the town road modification works according to any one of claims 6 to 9,

the thickness of each layer of the gravel base layer is matched with the thickness of the step layer of the old road surface on one side of the gravel base layer;

the thickness of each asphalt concrete base layer is matched with the thickness of the old asphalt stepped layer on one side of the asphalt concrete base layer.

Technical Field

The invention relates to the technical field of municipal engineering, in particular to a construction method and a lap joint structure for asphalt pavement lap joint of municipal road reconstruction engineering.

Background

The old road reconstruction means that the original road which does not meet the technical grade requirement is improved to the technical grade and the technical standard required by planning according to the planning requirement of the transportation network so as to improve the use quality and the traffic capacity of the original road. Because settlement and deformation differences exist between the new roadbed and the old roadbed, the bottom of a pavement structure layer can be hollowed, so that the pavement structure is cracked, and the pavement of an old road widening reconstruction project is often cracked longitudinally.

Disclosure of Invention

In view of the above, the invention provides a municipal road reconstruction project asphalt pavement lap joint construction method and a lap joint structure, and aims to solve the problem that the existing old road widening reconstruction project pavement is cracked frequently.

On one hand, the invention provides a municipal road reconstruction engineering bituminous pavement lapping construction method, which comprises the following steps: milling the edge of the old pavement into a stepped structure and cleaning each layer of milled surface; each layer of old road surface ladder layer on old road surface is handled according to first preset mode in proper order, first preset mode is: paving broken stones on one side of the old pavement stepped layer to the top wall of the old pavement stepped layer to form a broken stone base layer, rolling the broken stone base layer, maintaining the broken stone base layer and cleaning floating ash and impurities on the surface of the broken stone base layer; processing each layer of old asphalt stepped layer of the current asphalt pavement according to a second preset mode in sequence, wherein the second preset mode is as follows: one side of old pitch ladder layer, pave asphalt concrete extremely the roof of old pitch ladder layer is in order to form the asphalt concrete basic unit and roll it the back, clear up the surface of asphalt concrete basic unit.

Further, according to the overlapping construction method for the asphalt pavement of the municipal road reconstruction project, the old asphalt stepped layer is of a three-layer structure from bottom to top, and asphalt concrete paved on one side of the old asphalt stepped layer sequentially comprises the following steps: coarse grain asphalt concrete, medium grain modified asphalt concrete and mixture of asphalt mastic and crushed stone.

Further, above-mentioned town road reconstruction engineering bituminous paving overlap joint construction method is to each layer in the step that old pitch ladder layer was handled, except the superiors the old pitch ladder layer, other in the processing on old pitch ladder layer the clearance behind the surface of pitch concrete basic unit still includes: and spreading emulsified asphalt binder oil on the surface of the asphalt concrete base layer to bond two adjacent asphalt concrete base layers.

Further, according to the construction method for overlapping the asphalt pavement of the municipal road reconstruction project, the step layer of the old pavement is of a three-layer structure from bottom to top, and the mass ratio of cement to the crushed stone paved on one side of the old pavement is 4%, 5% and 5% in sequence.

Further, in the step of processing the old road surface step layer on each layer of the asphalt pavement lap joint construction method for the municipal road reconstruction project, after rolling the macadam base layer and before cleaning and maintaining, the method further comprises the following steps: and paving and sticking geogrids on the top surface of the lap joint of the step layer of the old pavement and the crushed stone base layer.

On the other hand, the invention provides a municipal road reconstruction engineering bituminous pavement lap joint structure, which comprises the following components: old road surface; the edge part of the old pavement is of a step-shaped structure and comprises a plurality of layers of old pavement step layers and a plurality of layers of old asphalt step layers arranged above the old pavement step layers; each layer one side on old road surface ladder layer all is equipped with the rubble basic unit, and, each layer one side on old pitch ladder layer all is equipped with asphalt concrete basic unit.

Further, according to the overlapping construction method for the asphalt pavement of the municipal road reconstruction project, the old asphalt step layer is three layers, and the asphalt concrete base layer arranged on one side of the old asphalt step layer sequentially comprises the following steps: coarse grain type asphalt concrete layer, medium grain type modified asphalt concrete layer and asphalt mastic macadam mixed material layer.

Further, according to the construction method for overlapping the asphalt pavements in the municipal road reconstruction project, emulsified asphalt bonding layer oil layers are arranged on the upper surfaces of other asphalt concrete base layers except the uppermost asphalt concrete base layer in each asphalt concrete base layer, so that the adjacent two asphalt concrete base layers are bonded.

Further, according to the construction method for overlapping the asphalt pavements in the municipal road reconstruction project, geogrids are arranged on the top surfaces of the old pavement step layers and the overlapping positions of the broken stone base layers on one sides of the old pavement step layers.

Further, according to the construction method for overlapping the asphalt pavement in the municipal road reconstruction project, the thickness of each gravel base layer is matched with the thickness of the step layer of the old pavement on one side of the gravel base layer; the thickness of each asphalt concrete base layer is matched with the thickness of the old asphalt stepped layer on one side of the asphalt concrete base layer.

According to the asphalt pavement lap construction method and the lap structure for the municipal road reconstruction project, a new asphalt concrete pavement structure is additionally paved on one side of an old asphalt pavement, so that the new and old asphalt pavement structures form a whole, the width of the asphalt pavement is increased, the whole traffic volume of the road is improved, the new and old asphalt pavement structures are combined and expanded, the new and old asphalt pavement structures are organically and tightly combined, the uneven settlement and reflection cracks at the joints of the new and old asphalt pavement structures are reduced to a certain extent, the problem that the construction quality of the joints of the new and old asphalt pavement structures is difficult to control is effectively solved, the unfavorable stress state of the pavement structures is changed, a reliable and effective roadbed and pavement treatment mode is required to reduce the differential settlement and deformation between the new and old roadbeds; meanwhile, the lap joint construction method and the lap joint structure are simple and convenient to operate, the incidence rate of early diseases of the asphalt pavement in the operation stage can be effectively reduced, the service life of the pavement is prolonged, and the maintenance and management cost is saved; in addition, the lapping construction method and the lapping structure are not only suitable for the old road widening project, but also suitable for the widening and building construction of roads adopting other grades and purposes of the asphalt pavement.

Furthermore, self-adhesive glass fiber geogrids are arranged in the base layers of the new and old pavements in a layered mode to play a role in reinforcing the roadbed, and pavement cracks caused by reflection of foundation cracks can be prevented; the self-adhesive glass fiber geogrid has the characteristics of low price, stable performance, high strength, low elongation, high temperature resistance, light weight, good toughness, corrosion resistance, long service life and the like, can be widely applied to the engineering fields of old asphalt pavements, roads and bridges, pavement reinforcement treatment and the like, can reinforce and reinforce the pavement, prevents pavement track fatigue cracks and delays and reduces reflection cracks; the self-adhesive glass fiber geogrid is convenient to construct, wide in application, convenient to store, low in price and easy to control construction quality.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a flow chart of a method for overlapping and constructing an asphalt pavement of a municipal road reconstruction project according to an embodiment of the invention;

FIG. 2 is a transverse schematic view of an asphalt pavement lap joint structure of a municipal road reconstruction project provided by an embodiment of the invention;

FIG. 3 is a longitudinal schematic view of an asphalt pavement lap joint structure of a municipal road reconstruction project provided by an embodiment of the invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The method comprises the following steps:

referring to fig. 1, the flowchart of the asphalt pavement lap construction method for the municipal road reconstruction project according to the embodiment of the invention is shown. As shown in the figure, the construction method comprises the following steps:

and step S1, milling the edge of the old road surface into a step-shaped structure and cleaning each layer of milled surface.

Specifically, with reference to fig. 2 to 3, the overlapped edge portions of the old pavement structure, i.e., the current pavement structure and the newly-built pavement structure, are milled into a stepped structure, and are milled all the way to the top surface of the current roadbed, and the milled surfaces of the layers are cleaned. And the old pavement and the new pavement are both asphalt concrete pavements. The step height does not exceed the thickness of the corresponding base layer or surface layer, the protruding width of each layer of the stepped structure can be determined according to the actual situation, and the stepped structure is not limited in this embodiment. In order to ensure the bonding performance of the new and old pavements at the widened joint position, the residues on the milling surface are thoroughly cleaned after milling, a forest fire extinguisher can be used for cleaning the milling surface on the spot, the granular milling residues are removed until the surface is free from residues such as dust, stone chips, sand grains and the like, and the next working procedure can be carried out after the milling surface is dried. Before milling, the original road surface can be cleaned, so that the original road surface is clean; measuring and positioning are carried out on a working surface, and the advancing direction of the milling machine is planned; and whether the milling machine is in a normal working state or not is checked, and the old pavement structure is milled after the milling machine is determined. The old pavement comprises a plurality of layers of old pavement step layers 1 and a plurality of layers of old asphalt step layers 2 arranged above the old pavement step layers 1. In this embodiment, the old road surface step layer 1 and the old asphalt step layer 2 are both three layers as an example for explanation.

Step S2, sequentially processing each old road surface step layer of the old road surface according to a first preset mode, where the first preset mode is: one side of old road surface ladder layer paves the rubble extremely the roof of old road surface ladder layer is in order to form the rubble basic unit and roll it the back, carries out maintenance and clearance rubble basic unit surperficial ash and debris to the rubble basic unit.

Specifically, each layer of old road surface stepped layer of the old road surface is processed from bottom to top in sequence according to a first preset mode, wherein the first preset mode is as follows: one side of old road surface ladder layer 1 paves the rubble extremely the roof of old road surface ladder layer 1 is in order to form rubble basic unit 3 and roll closely knit back to it, rubble basic unit 3 and old road surface ladder layer 1's thickness looks adaptation, carries out watering or maintenance of moisturizing 7 days to rubble basic unit 3, clears up the superficial ash and debris on 3 surfaces of rubble basic unit. Preferably, the old road surface step layer 1 is a three-layer structure from bottom to top, and is an old road surface subbase layer 11, an old road surface middle base layer 12 and an old road surface upper base layer 13 in sequence, and the mass ratio of cement to crushed stone in the crushed stone paved on one side of the old road surface is 4%, 5% and 5% in sequence, that is, the cement is 4%, 5% and 5% in sequence of the mass of the crushed stone aggregate, that is, the crushed stone in the three-layer crushed stone base layer 3 from bottom to top is 4% cement-stabilized crushed stone base layer, 5% cement-stabilized crushed stone base layer and 5% cement-stabilized crushed stone base. In order to prevent the pavement cracks caused by the reflection of the base cracks, it is preferable that after the crushed stone base layer 3 is rolled and before the cleaning and curing, the method further comprises the following steps: the top surface of the lap joint of the old pavement step layer 1 and the broken stone base layer 3 is paved with the geogrid 4 to perform reinforcement operation, so that pavement cracks caused by reflection of foundation cracks can be prevented; the geogrid 4 is laid and pasted in the center of the top of the lap joint structure, and the lap joint length of the two sides is 50cm, so that the stability of the geogrid is ensured. The geogrid 4 can be a self-adhesive glass fiber geogrid which has the characteristics of low price, stable performance, high strength, low elongation, high temperature resistance, light weight, good toughness, corrosion resistance, long service life and the like, can be widely applied to the engineering fields of old asphalt pavements, roads and bridges, pavement reinforcement treatment and the like, can reinforce and reinforce pavements, prevents pavement track fatigue cracks and delays and reduces reflection cracks; and the self-adhesive glass fiber geogrid is convenient to construct, wide in application, convenient to store, low in price and easy to control the construction quality. And after the geogrid 4 is paved and adhered on the old asphalt step layer 1 on the uppermost layer, the penetrating layer oil and the sealing layer oil are spread to form an oil layer 5.

For example, in the embodiment, the old road surface step layer 1 is a three-layer structure from bottom to top, and the steps are that along the edge of the old road surface subbase layer 11, 18cm4% cement stabilized macadam subbase layer is paved on the current roadbed top surface, the paving thickness of the newly paved 18cm4% cement stabilized macadam subbase layer is controlled to be consistent with the thickness of the old road surface subbase layer 11, and the road roller rolls tightly; paving a self-adhesive glass fiber geogrid on the top surface of the lap joint of the old pavement underlayer 11 and the 18cm4% cement stabilized macadam underlayer, controlling the self-adhesive glass fiber geogrid to be paved in the center of the top of the lap joint structure during construction, and enabling the lap joint length of the two sides to be 50 cm; and (5) watering or maintaining for 7 days, and cleaning floating ash and impurities on the surface of the newly paved 18cm4% cement stabilized macadam subbase layer. Paving 18cm5% cement stabilized graded broken stone base layer at the lapping position of one side of the old road surface middle base layer 12 and the top surfaces of the old road surface subbase layer 11 and the 18cm4% cement stabilized broken stone subbase layer along the edge of the old road surface middle base layer 12, controlling the paving thickness of the newly paved 18cm5% cement stabilized broken stone base layer to be consistent with the thickness of the old road surface middle base layer 12, and compacting by a road roller; paving and pasting a self-adhesive glass fiber geogrid on the top surface of the lap joint of the base layer 12 and the 18cm5% cement stabilized macadam base layer in the old pavement, controlling the self-adhesive glass fiber geogrid to be paved and pasted in the center of the top of the lap joint structure during construction, wherein the lap joint length of two sides is 50 cm; watering or maintaining for 7 days, and cleaning floating ash and impurities on the surface of the newly paved 18cm5% cement stable graded broken stone substrate; paving an 18cm5% cement stabilized graded broken stone upper base layer at the lap joint of the base layer 12 and the 18cm5% cement stabilized graded broken stone base layer in the old road surface on one side of the old road surface upper base layer 13 along the edge of the old road surface upper base layer 13, controlling the paving thickness of the newly paved 18cm5% cement stabilized broken stone upper base layer to be consistent with the thickness of the old road surface upper base layer 13, and compacting by a road roller; watering or maintaining for 7 days, and cleaning floating ash and impurities on the surface of the upper base layer of the newly paved 18cm5% cement stabilized graded broken stone; 1.5L/m2 emulsified bitumen topcoats and 1cmES-3 slurry seals were dispensed to form an oil layer 5; and self-adhesive glass fiber geogrids are paved on the top surfaces of the lap joints of the upper base layer 13 of the old pavement and the upper base layer of the 18cm5% cement stabilized graded broken stone, the self-adhesive glass fiber geogrids are controlled to be paved in the centers of the tops of lap joints during construction, and the lap joint lengths of the two sides are both 50 cm.

Step S3, processing each layer of old asphalt stepped layer of the old road surface according to a second preset mode in sequence, wherein the second preset mode is as follows: one side of old pitch ladder layer, pave asphalt concrete extremely the roof of old pitch ladder layer is in order to form the asphalt concrete basic unit and roll it the back, clear up the surface of asphalt concrete basic unit.

Specifically, each layer of the old asphalt step layer 2 of the old pavement is sequentially processed from bottom to top according to a second preset mode; the second preset mode is as follows: paving asphalt concrete on one side of the old asphalt stepped layer 2 to the top wall of the old asphalt stepped layer 2 to form an asphalt concrete base layer 6, and cleaning the surface of the asphalt concrete base layer 6 after rolling and compacting the asphalt concrete base layer; and opening traffic after the asphalt concrete base layer 6 on the uppermost layer is cooled to the surface temperature lower than the preset temperature. For the upper and lower surface course of improvement have sufficient cohesive force to make the two bond into firm whole, preferably, except the superiors old pitch ladder layer 6 is other in the processing of old pitch ladder layer 6 the clearance behind the surface of pitch concrete basic unit 6, still include: and spreading emulsified asphalt binder oil on the surface of the asphalt concrete base layer 6 to form an emulsified asphalt binder oil layer, so that two adjacent asphalt concrete base layers 6 are bonded, and the two adjacent asphalt concrete base layers are prevented from sliding and moving. Wherein the preset temperature may be 50 ℃. In this embodiment, the old asphalt step layer 2 is a three-layer structure from bottom to top, and includes an old asphalt base layer 21, an old asphalt middle base layer 22, and an old asphalt upper base layer 23, and the asphalt concrete base layer 6 disposed on one side of the old asphalt step layer sequentially includes a coarse-grained asphalt concrete layer, a medium-grained modified asphalt concrete layer, and an asphalt mastic macadam mixture layer, that is, the materials sequentially include coarse-grained asphalt concrete (AC-25C), medium-grained modified asphalt concrete (AC-20C), and asphalt mastic macadam mixture (SMA-13).

For example, the steps are sequentially that 7cm coarse-grained asphalt concrete (AC-25C) is paved on the top surface of the lapping part of the old pavement upper base layer 13 and the 18cm5% cement stabilized graded broken stone upper base layer along the edge part of the old asphalt subbase layer 21; compacting by a road roller; cleaning 7cm of coarse grain asphalt concrete (AC-25C) surface, and spreading 0.5L/m2 emulsified asphalt binder oil (PC-3) to form an emulsified asphalt binder oil layer; paving 6-10 cm (containing a leveling layer) of medium-grain modified asphalt concrete (AC-20C) along the edge of the old asphalt medium-base layer 22; compacting by a road roller; cleaning the surface of 6-10 cm (containing a leveling layer) of medium-grain modified asphalt concrete (AC-20C), and spreading 0.5L/m2 emulsified asphalt binder oil (PC-3) to form an emulsified asphalt binder oil layer; paving 4cm of asphalt mastic gravel mixture (SMA-13) along the edge of the old asphalt upper base layer 23; compacting by a road roller; and opening the traffic after the 4cm of the mixture of the asphalt mastic macadam (SMA-13) is cooled to the surface temperature of less than 50 ℃.

In conclusion, the asphalt pavement lap joint construction method for the municipal road reconstruction project provided by the embodiment has the advantages that a new asphalt concrete pavement structure is additionally paved on one side of an existing old asphalt pavement, so that the new and old asphalt pavement structures form a whole, the width of the asphalt pavement is increased, the whole traffic capacity of the road is improved, the new and old asphalt pavement structures are organically and tightly combined through combination and widening construction of the new and old asphalt pavement structures, uneven settlement and reflection cracks at the joints of the new and old asphalt pavement structures are reduced to a certain extent, the problem that the construction quality of the joints of the new and old asphalt pavement structures is difficult to control is effectively solved, the unfavorable stress state of the pavement structures is changed, and a reliable and effective roadbed and pavement treatment mode is required to reduce the difference settlement and deformation between the new and old roadbeds; meanwhile, the lap joint construction method is simple and convenient to operate, can effectively reduce the incidence rate of early diseases of the asphalt pavement in the operation stage, prolongs the service life of the pavement and is beneficial to saving maintenance and management cost; in addition, the lapping construction method is not only suitable for the old road widening project, but also suitable for the widening and building construction of roads adopting other grades and purposes of the asphalt pavement.

Furthermore, self-adhesive glass fiber geogrids are paved and adhered in layers in the base layers of the new and old pavements to play a role in reinforcing the subgrade, so that pavement cracks caused by reflection of foundation cracks can be prevented; the self-adhesive glass fiber geogrid has the characteristics of low price, stable performance, high strength, low elongation, high temperature resistance, light weight, good toughness, corrosion resistance, long service life and the like, can be widely applied to the engineering fields of old asphalt pavements, roads and bridges, pavement reinforcement treatment and the like, can reinforce and reinforce the pavement, prevents pavement track fatigue cracks and delays and reduces reflection cracks; the self-adhesive glass fiber geogrid is convenient to construct, wide in application, convenient to store, low in price and easy to control construction quality.

The structure embodiment is as follows:

referring to fig. 2 to 3, preferred structures of the asphalt pavement lap joint structure of the town road modification project provided by the embodiment of the invention are shown. As shown, the overlapping structure includes: old road surface; wherein the content of the first and second substances,

the edge part of the old pavement is of a step-shaped structure and comprises a plurality of layers of old pavement step layers 1 and a plurality of layers of old asphalt step layers 2 arranged above the old pavement step layers 1; each layer one side of old road surface ladder layer 1 all is equipped with rubble basic unit 3, and, each layer one side of old pitch ladder layer 4 all is equipped with asphalt concrete basic unit 6.

Specifically, the old road surface step layer 1 is a three-layer structure from bottom to top, and is sequentially an old road surface subbase layer 11, an old road surface middle base layer 12 and an old road surface upper base layer 13, wherein the mass ratio of cement to crushed stone in the crushed stone paved on one side of the old road surface subbase layer is 4%, 5% and 5% in sequence, that is, the cement is 4%, 5% and 5% in sequence of the mass of the crushed stone aggregate, that is, the crushed stone in the three-layer crushed stone base layer 3 from bottom to top is sequentially 4% cement-stabilized crushed stone base layer, 5% cement-stabilized crushed stone base layer and 5% cement-. In order to prevent the pavement cracks caused by the reflection of the basic cracks, the top surface of the lap joint of the old pavement step layer 1 and the broken stone base layer 3 is preferably paved with the geogrid 4 so as to perform reinforcement operation and prevent the pavement cracks caused by the reflection of the basic cracks; the geogrid 4 is laid and pasted in the center of the top of the lap joint structure, and the lap joint length of the two sides is 50cm, so that the stability of the geogrid is ensured. The geogrid 4 can be a self-adhesive glass fiber geogrid which has the characteristics of low price, stable performance, high strength, low elongation, high temperature resistance, light weight, good toughness, corrosion resistance, long service life and the like, can be widely applied to the engineering fields of old asphalt pavements, roads and bridges, pavement reinforcement treatment and the like, can reinforce and reinforce pavements, prevents pavement track fatigue cracks and delays and reduces reflection cracks; and the self-adhesive glass fiber geogrid is convenient to construct, wide in application, convenient to store, low in price and easy to control the construction quality. Spreading permeable oil and seal oil on the geogrid 4 on the uppermost layer of the old asphalt step layer 1 to form an oil layer 5. The old asphalt step layer 2 is a three-layer structure from bottom to top and is an old asphalt subbase layer 21, an old asphalt middle base layer 22 and an old asphalt upper base layer 23, and the asphalt concrete base layer 6 arranged on one side of the old asphalt step layer sequentially comprises a coarse-grained asphalt concrete layer, a medium-grained modified asphalt concrete layer and an asphalt mastic macadam mixed material layer, namely, the materials sequentially comprise coarse-grained asphalt concrete (AC-25C), medium-grained modified asphalt concrete (AC-20C) and asphalt mastic macadam mixed material (SMA-13). In order to improve the adhesion between the upper and lower surface layers and to bond the two layers into a firm whole, preferably, each layer is provided with an emulsified asphalt adhesive layer oil layer on the upper surface of the asphalt concrete base layer 3 except the uppermost layer of the asphalt concrete base layer 3 so as to bond the two adjacent layers of the asphalt concrete base layer and further avoid the sliding and the pushing of the two adjacent layers.

In the embodiment, the thickness of each layer of the gravel base layer 3 is matched with the thickness of the old road surface step layer 1 on one side of the gravel base layer; the thickness of each asphalt concrete base layer 6 is matched with the thickness of the old asphalt step layer 2 on one side of the asphalt concrete base layer.

In the embodiment, the principle of the lapping structure and the lapping construction method are the same, and related parts can be referred to each other.

In conclusion, the asphalt pavement lap joint structure for the municipal road reconstruction project provided by the embodiment has the advantages that a new asphalt concrete pavement structure is additionally paved on one side of an existing old asphalt pavement, so that the new and old asphalt pavement structures form a whole, the width of the asphalt pavement is increased, the whole traffic capacity of the road is improved, the new and old asphalt pavement structures are organically and tightly combined through combination and widening construction of the new and old asphalt pavement structures, uneven settlement and reflection cracks at the joints of the new and old asphalt pavement structures are reduced to a certain extent, the problem that the construction quality of the joints of the new and old asphalt pavement structures is difficult to control is effectively solved, the unfavorable stress state of the pavement structures is changed, and a reliable and effective roadbed and pavement treatment mode is required to reduce differential settlement and deformation between the new and old roadbeds; meanwhile, the lap joint structure is simple in structure and easy and convenient to operate, the incidence rate of early diseases of the asphalt pavement in the operation stage can be effectively reduced, the service life of the pavement is prolonged, and the maintenance and management cost is saved; in addition, the lap joint structure is not only suitable for the old road widening project, but also suitable for the widening and building construction of roads adopting other grades and purposes of the asphalt pavement.

Furthermore, self-adhesive glass fiber geogrids are arranged in the base layers of the new and old pavements in a layered mode to play a role in reinforcing the roadbed, and pavement cracks caused by reflection of foundation cracks can be prevented; the self-adhesive glass fiber geogrid has the characteristics of low price, stable performance, high strength, low elongation, high temperature resistance, light weight, good toughness, corrosion resistance, long service life and the like, can be widely applied to the engineering fields of old asphalt pavements, roads and bridges, pavement reinforcement treatment and the like, can reinforce and reinforce the pavement, prevents pavement track fatigue cracks and delays and reduces reflection cracks; the self-adhesive glass fiber geogrid is convenient to construct, wide in application, convenient to store, low in price and easy to control construction quality.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.