阅读说明：本技术 一种改扩建新旧路面拼接方法 (Splicing method for rebuilding and expanding new and old road surfaces ) 是由 李军 苏敏 邱志雄 李卫民 李伟雄 熊春龙 王端宜 李善强 吴传海 陈楚鹏 许新 于 2021-08-20 设计创作，主要内容包括：本发明公开一种改扩建新旧路面拼接方法,旧路面开挖成若干级台阶；在开挖面底部铺设防拉裂部件顺延至第一级台阶,在开挖面底部的防拉裂部件上开设锚固孔固定,浇筑第一新路面层；在第一级台阶上铺设防拉裂部件并顺延第二级台阶上,第一级台阶上的防拉裂部件与开挖面底部防拉裂部件形成搭接区域,在第一新路面层的顶面铺设防拉裂部件顺延至搭接区域,在第一级台阶顶面的防裂部件和搭接区域内打设锚固孔并固定,浇筑第二新路面层；重复上述施工,直至完成新旧路面施工；新路面结构对该层路面结构底部的防拉裂部件进行压紧,随着新路面结构的继续施工,累加的上层新路面结构会对下部的防拉裂部件形成进一步的压紧,增强新旧路面结构连接的稳定性。(The invention discloses a splicing method for rebuilding and expanding new and old road surfaces, wherein the old road surfaces are excavated into a plurality of steps; paving a tension-cracking-preventing component at the bottom of the excavation face to extend to the first-stage step, arranging anchoring holes on the tension-cracking-preventing component at the bottom of the excavation face for fixing, and pouring a first new pavement layer; laying a tension-cracking preventing component on the first step and extending the tension-cracking preventing component on the first step onto the second step, wherein the tension-cracking preventing component on the first step and the tension-cracking preventing component at the bottom of the excavation face form a lap joint area, laying a tension-cracking preventing component on the top surface of the first new pavement layer and extending the tension-cracking preventing component to the lap joint area, drilling and fixing anchoring holes in the anti-cracking component on the top surface of the first step and the lap joint area, and pouring a second new pavement layer; repeating the construction until the construction of the new and old road surfaces is completed; the new pavement structure compresses tightly the part that prevents drawing and splitting of this layer of pavement structure bottom, and along with the continuation construction of new pavement structure, the new pavement structure of upper strata that adds up can form further compressing tightly to the part that prevents drawing and splitting of lower part, strengthens the stability of new and old road surface structural connection.)

1. A splicing method for rebuilding and expanding new and old pavements is characterized by comprising the following steps:

excavating the old road surface and forming a plurality of steps;

laying a tension crack prevention component at the bottom of the excavation face and extending the tension crack prevention component to the top surface of the first-stage step, drilling an anchoring hole downwards on the tension crack prevention component at the bottom of the excavation face to be below the bottom of the excavation face and penetrating the anchoring hole through an anchoring nail for fixing, and pouring a first new road surface layer on the surface of the tension crack prevention component at the bottom of the excavation face and butting the first-stage step;

continuously laying an anti-cracking component on the top surface of the first step and extending the anti-cracking component to the top surface of the second step, wherein the anti-cracking component on the top surface of the first step and the anti-cracking component extending upwards from the bottom of the excavation surface form a lap joint area, laying an anti-cracking component on the top surface of the first new pavement layer and extending the anti-cracking component to the lap joint area to complete the covering of the lap joint area, arranging anchoring holes on the anti-cracking component on the top surface of the first step and in the lap joint area to be below the top surface of the first step and fixing the anchoring holes by using anchoring nails to penetrate through the anchoring holes, and pouring a second new pavement layer on the anti-cracking component on the top surface of the first new pavement layer and the anti-cracking component on the top surface of the first step and butting the second step;

and repeating the construction until the Nth step is in butt joint with the Nth new pavement layer, and completing splicing construction of the new pavement and the old pavement.

2. The splicing method for rebuilding new and old road surface according to claim 1,

the old pavement steps are three layers, namely a roadbed top surface, a subbase layer, a base layer and an asphalt surface layer from bottom to top in sequence;

paving an underlayer bottom anti-pulling crack component on the top surface of the roadbed, extending the underlayer bottom anti-pulling crack component to the top surface of the underlayer along the step, downwards punching roadbed top surface anchoring holes on the underlayer bottom anti-pulling crack component, penetrating the roadbed top surface anchoring holes with roadbed top surface anchoring nails for fixing, and constructing a new pavement underlayer base layer on the underlayer bottom anti-pulling crack component and butting the new pavement underlayer bottom base layer with the old pavement underlayer step;

laying a base layer bottom anti-pulling part on the top surface of the base layer and extending the base layer bottom anti-pulling part to the top surface of the base layer along the step, wherein the base layer bottom anti-pulling part and the base layer bottom anti-pulling part extending the top surface of the roadbed form a lap joint area, laying a base layer top anti-pulling part on the top surface of the new roadbed bottom base layer and extending the base layer top anti-pulling part to the lap joint area to complete the covering of the lap joint area, drilling a base layer top surface anchoring hole on the base layer bottom anti-pulling part and the lap joint area and fixing the base layer top surface anchoring hole by using a base layer top surface anchoring nail, and constructing a new roadbed on the base layer bottom anti-pulling part and the base layer top anti-pulling part and butting the old roadbed step;

paving an asphalt surface layer bottom anti-pulling part on the top surface of the base layer and extending the asphalt surface layer bottom anti-pulling part to the top surface of the asphalt surface layer along the step, paving a base layer top anti-pulling part on the top surface of the new pavement base layer and extending the base layer bottom anti-pulling part to the overlapping area to complete the covering of the overlapping area, drilling base layer top surface anchoring holes on the asphalt surface layer bottom anti-pulling part and the overlapping area and fixing the base layer top surface anchoring holes by base layer top surface anchoring nails, and constructing a new pavement asphalt surface layer on the asphalt surface layer bottom anti-pulling part and the base layer top anti-pulling part and butting the old pavement asphalt surface layer step;

paving a top surface of the asphalt surface layer with an overlaying layer bottom anti-pulling part, forming a lap joint area with the asphalt surface layer bottom anti-pulling part extending along the base bottom surface, paving an asphalt surface layer top anti-pulling part on the top surface of the new pavement asphalt surface layer and extending along the lap joint area to complete the covering of the lap joint area, paving an asphalt surface layer top surface anchoring hole on the overlaying layer bottom anti-pulling part and the lap joint area, penetrating the asphalt surface layer top surface anchoring hole with an asphalt surface layer top surface anchoring nail for fixing, paving an asphalt overlaying layer on the overlaying layer bottom anti-pulling part and the asphalt surface layer top anti-pulling part, and paving an asphalt overlaying layer on the asphalt overlaying layer bottom surface asphalt overlaying layer and the asphalt surface layer top anti-pulling part.

3. The splicing method for reconstructing the new and old pavement according to claim 2, wherein the joints of the base layer bottom anti-pulling part and the base layer bottom anti-pulling part, the base layer bottom anti-pulling part and the asphalt surface layer bottom anti-pulling part, the asphalt surface layer bottom anti-pulling part and the overlay layer bottom anti-pulling part, and the overlay layer bottom anti-pulling part and the asphalt surface layer top anti-pulling part are lapped, and the lapping length is not less than 10 cm.

4. The splicing method for reconstructing the old and new road surface according to claim 3, wherein the number of the roadbed top surface anchoring holes, the underlayer top surface anchoring holes, the base layer top surface anchoring holes and the asphalt surface top surface anchoring holes is not less than 1, the arrangement intervals of the anchoring holes are determined by constructing an ABAQUS finite element numerical simulation model, performing mechanical response analysis of different positions of the road surface structure under the action of standard load, and obtaining the optimal arrangement intervals of the anchoring holes, which are the optimal arrangement intervals of the anchoring holes, when the displacement differences of the two sides of the asphalt surface layer splicing seams, the two sides of the base layer splicing seams and the two sides of the underlayer splicing seams of the old and new road surface are the smallest through different attempts.

5. The method for reconstructing and expanding the splicing of the new and old pavement as claimed in claim 4, wherein H is defined as the depth of each step of the anchoring hole, L1 is the length of the bottom anti-pulling-cracking component of the base layer, L2 is the length of the top anti-pulling-cracking component of the base layer, L3 is the length of the top anti-pulling-cracking component of the base layer, and L4 is the length of the top anti-pulling-cracking component of the asphalt surface layer, basic parameters of the simulation model are set by constructing an ABAQUS finite element numerical simulation model and primarily simulating the numerical values of the parameters L1, L2, L3 and L4, wherein the basic parameters comprise the modulus, Poisson ratio, thickness and density of the asphalt surface layer, the base layer, the subgrade and the anti-pulling-cracking components, mechanical response analysis of different positions of the pavement structure under the action of standard load is carried out, and the A and B points, C and D points on the splicing seams of the two sides of the splicing seams of the new and old pavement are obtained by different attempts, And when the displacement difference of the points E and F on the two sides of the splicing seam of the subbase layer is minimum, combining the parameters into design parameters.

6. The method as claimed in claim 4, wherein the bottom layer top surface anchoring hole is at least one of the joints between the bottom layer anti-crack component and the top layer anti-crack component, the top layer anchoring hole is at least one of the joints between the bottom layer anti-crack component and the top layer anti-crack component, and the top layer anchoring hole is at least one of the joints between the bottom layer anti-crack component and the top layer anti-crack component.

7. The splicing method for reconstructing the new and old pavement according to claim 6, wherein the base layer bottom anti-pulling-apart component and the base layer top anti-pulling-apart component, the asphalt surface layer bottom anti-pulling-apart component and the base layer top anti-pulling-apart component, and the overlapping length of the additional layer bottom anti-pulling-apart component and the asphalt surface layer top anti-pulling-apart component is not less than 10 cm.

8. The splicing method for reconstructing and extending a new and old road surface according to claim 1, wherein the surface layer of the step is flattened after the old road surface is excavated.

9. The splicing method for reconstructing the new and old pavement according to claim 2, wherein the bottom anti-pulling-apart component of the subbase layer, the bottom anti-pulling-apart component of the base layer, the bottom anti-pulling-apart component of the asphalt pavement, the bottom anti-pulling-apart component of the overlay layer and the top anti-pulling-apart component of the asphalt pavement are made of polyester glass fiber cloth or glass fiber grating type geotextile.

Technical Field

The invention relates to the field of road construction, in particular to a splicing method for reconstructing and expanding new and old pavements.

Background

By the end of 2020, the highway mileage in continental China exceeds 15 kilometers. The operated expressway is mainly provided with two-way four lanes, and with the rapid development of national economy, the traffic volume exceeds the predicted traffic volume, traffic jam and accidents frequently occur, and the service level of the expressway is seriously influenced. Compared with reconstruction and extension projects, the newly-built expressway has the advantages of large investment, long construction period and more occupied land resources. The method has the advantages that the overlapping and the width splicing are carried out on the basis of the existing expressway, the existing road network structure and part of the existing roadbed and road surface structure can be fully utilized, the construction period is shortened, and the construction area and the capital investment are reduced. The coastal areas in the south of Guangdong province have the advantages of being economical, rich in population and increasingly tense in land resources, and improving the traffic capacity of roads by implementing reconstruction and expansion projects on the existing expressway. The reconstruction and expansion of the road surface relates to the splicing of new and old road surface structures, obvious joints exist in splicing areas of the new and old road surface structures, the material properties of two sides of the joints possibly differ greatly, and longitudinal cracks are easily generated at the longitudinal splicing joint positions of the new and old road surfaces after traffic is passed. The difference of the structural properties of the old pavement structure and the new pavement is large, the structural property difference can cause the non-coordinated deformation of the joint part, and the differential settlement of the roadbed can cause the longitudinal cracks of the pavement structure.

At present, the overlap joint widening of the reconstructed and expanded road surface adopts the symmetrical laying of a layer of 0.5-1.5 m polyester glass fiber cloth or glass fiber grating type geotextile on the splicing seam of a new road surface structure and an old road surface structure, and the main problems exist: 1. the geotextile is only laid on the top surface of the splicing seam within a certain width range, and cannot seal water which permeates into the lower structural layer from the top surface of the structural layer in the horizontal direction; 2. the geotextile has weak integral stabilizing effect on the new and old pavement structures, and the new and old pavement structures are easy to crack along splicing seams; 3. after the geotextile is laid, because the laying width is smaller than that of construction machinery such as a paver and the like, the geotextile is easy to roll up from the edge of the construction machinery, so that the geotextile loses the original function.

For example, in the new and old road base layer overlapping structure with publication number CN110924262A, the overlapping part of the new and old road surface is laid by using the conventional geotextile, when the new road surface is constructed, the geotextile is easily displaced or falls off, so that the joint of the new and old road surface is not firmly connected and water seepage easily occurs. For another example, in a new and old road surface splicing structure of a highway engineering and a construction method thereof, related fastening measures are not arranged at the joint of the new and old road surfaces, and the connection strength of the new and old road surfaces cannot be enhanced only by arranging a drainage belt. In order to solve the problems, the invention discloses a splicing method for rebuilding and expanding new and old pavements, which is used for solving the problem of unstable connection of the new and old pavements.

Disclosure of Invention

The invention aims to provide a splicing method for rebuilding and expanding new and old pavements, and the purpose of enhancing the connection stability of the new and old pavements is achieved.

In order to achieve the purpose, the invention provides the following scheme:

excavating the old road surface and forming a plurality of steps;

laying a tension crack prevention component at the bottom of the excavation face and extending the tension crack prevention component to the top surface of the first-stage step, drilling an anchoring hole downwards on the tension crack prevention component at the bottom of the excavation face to be below the bottom of the excavation face and penetrating the anchoring hole through an anchoring nail for fixing, and pouring a first new road surface layer on the surface of the tension crack prevention component at the bottom of the excavation face and butting the first-stage step;

continuously laying an anti-cracking component on the top surface of the first step and extending the anti-cracking component to the top surface of the second step, wherein the anti-cracking component on the top surface of the first step and the anti-cracking component extending upwards from the bottom of the excavation surface form a lap joint area, laying an anti-cracking component on the top surface of the first new pavement layer and extending the anti-cracking component to the lap joint area to complete the covering of the lap joint area, arranging anchoring holes on the anti-cracking component on the top surface of the first step and in the lap joint area to be below the top surface of the first step and fixing the anchoring holes by using anchoring nails to penetrate through the anchoring holes, and pouring a second new pavement layer on the anti-cracking component on the top surface of the first new pavement layer and the anti-cracking component on the top surface of the first step and butting the second step;

and repeating the construction until the Nth step is in butt joint with the Nth new pavement layer, and completing splicing construction of the new pavement and the old pavement.

Preferably, the old road surface steps are three layers, namely a roadbed top surface, a subbase layer, a base layer and an asphalt surface layer from bottom to top in sequence;

paving an underlayer bottom anti-pulling crack component on the top surface of the roadbed, extending the underlayer bottom anti-pulling crack component to the top surface of the underlayer along the step, downwards punching roadbed top surface anchoring holes on the underlayer bottom anti-pulling crack component, penetrating the roadbed top surface anchoring holes with roadbed top surface anchoring nails for fixing, and constructing a new pavement underlayer base layer on the underlayer bottom anti-pulling crack component and butting the new pavement underlayer bottom base layer with the old pavement underlayer step;

laying a base layer bottom anti-pulling part on the top surface of the base layer and extending the base layer bottom anti-pulling part to the top surface of the base layer along the step, wherein the base layer bottom anti-pulling part and the base layer bottom anti-pulling part extending the top surface of the roadbed form a lap joint area, laying a base layer top anti-pulling part on the top surface of the new roadbed bottom base layer and extending the base layer top anti-pulling part to the lap joint area to complete the covering of the lap joint area, drilling a base layer top surface anchoring hole on the base layer bottom anti-pulling part and the lap joint area and fixing the base layer top surface anchoring hole by using a base layer top surface anchoring nail, and constructing a new roadbed on the base layer bottom anti-pulling part and the base layer top anti-pulling part and butting the old roadbed step;

paving an asphalt surface layer bottom anti-pulling part on the top surface of the base layer and extending the asphalt surface layer bottom anti-pulling part to the top surface of the asphalt surface layer along the step, paving a base layer top anti-pulling part on the top surface of the new pavement base layer and extending the base layer bottom anti-pulling part to the overlapping area to complete the covering of the overlapping area, drilling base layer top surface anchoring holes on the asphalt surface layer bottom anti-pulling part and the overlapping area and fixing the base layer top surface anchoring holes by base layer top surface anchoring nails, and constructing a new pavement asphalt surface layer on the asphalt surface layer bottom anti-pulling part and the base layer top anti-pulling part and butting the old pavement asphalt surface layer step;

paving a top surface of the asphalt surface layer with an overlaying layer bottom anti-pulling part, forming a lap joint area with the asphalt surface layer bottom anti-pulling part extending along the base bottom surface, paving an asphalt surface layer top anti-pulling part on the top surface of the new pavement asphalt surface layer and extending along the lap joint area to complete the covering of the lap joint area, paving an asphalt surface layer top surface anchoring hole on the overlaying layer bottom anti-pulling part and the lap joint area, penetrating the asphalt surface layer top surface anchoring hole with an asphalt surface layer top surface anchoring nail for fixing, paving an asphalt overlaying layer on the overlaying layer bottom anti-pulling part and the asphalt surface layer top anti-pulling part, and paving an asphalt overlaying layer on the asphalt overlaying layer bottom surface asphalt overlaying layer and the asphalt surface layer top anti-pulling part.

Preferably, the part is prevented drawing and splits in subbase bottom with the part is prevented drawing and splits in basic unit bottom, the part is prevented drawing and splits in basic unit bottom with the part is prevented drawing and splits in pitch surface course bottom with add the joint that the part is prevented drawing and splits in layer bottom and the part is prevented drawing and splits in pitch surface course top and prevent drawing and split the part all carries out the overlap joint, and overlap joint length is not less than 10 cm.

Preferably, the number of the roadbed top surface anchoring holes, the sub-base layer top surface anchoring holes, the base layer top surface anchoring holes and the asphalt surface layer top surface anchoring holes is not less than 1, the arrangement intervals of the anchoring holes are determined by constructing an ABAQUS finite element numerical simulation model, mechanical response analysis of different positions of the pavement structure under the action of standard load is carried out, and the arrangement intervals of the anchoring holes, which are the optimal arrangement intervals of the anchoring holes, are obtained when the displacement differences of the two sides of the splicing seams of the asphalt surface layers of the new and old pavements, the two sides of the splicing seams of the base layer and the two sides of the splicing seams of the sub-base layer are the minimum.

Preferably, defining H as the depth of each step anchor hole, L1 as the length of the bottom anti-pulling part of the sub-base layer, L2 as the length of the top anti-pulling part of the sub-base layer, L3 as the length of the top anti-pulling part of the base layer, L4 as the length of the top anti-pulling part of the asphalt surface layer, by constructing an ABAQUS finite element numerical simulation model, setting the basic parameters of the simulation model by primarily simulating the numerical values of parameters L1, L2, L3 and L4, the basic parameters comprise modulus, Poisson's ratio, thickness and density of the asphalt surface layer, the base layer, the subbase layer, the roadbed and the anti-pulling crack component, mechanical response analysis of different positions of the pavement structure under the action of standard load is carried out, and obtaining parameter combination as design parameters when the displacement difference of points A and B on the two sides of the splicing seams of the asphalt surface layers of the new and old pavements, points C and D on the two sides of the splicing seams of the base layers and points E and F on the two sides of the splicing seams of the subbase layers is minimum through different attempts.

Preferably, the base layer top surface anchoring hole has at least one lap joint located between the base layer bottom anti-pulling-crack component and the base layer top anti-pulling-crack component, the base layer top surface anchoring hole has at least one lap joint located between the asphalt surface layer bottom anti-pulling-crack component and the base layer top anti-pulling-crack component, and the asphalt surface layer top surface anchoring hole has at least one lap joint located between the overlaying layer bottom anti-pulling-crack component and the asphalt surface layer top anti-pulling-crack component.

Preferably, the base layer bottom prevents the part that ftractures and the part that ftractures is prevented at the subbase layer top, the part that ftractures is prevented at asphalt surface layer bottom and the part that ftractures is prevented at the base layer top, the overlap joint length of the part that ftractures is prevented at the layering bottom and the part that ftractures is prevented at asphalt surface layer top is not less than 10 cm.

Preferably, after the old road surface is excavated, the surface layer of the step is leveled.

Preferably, the bottom anti-pulling-crack component of the subbase layer, the bottom anti-pulling-crack component of the base layer, the bottom anti-pulling-crack component of the asphalt surface layer, the bottom anti-pulling-crack component of the overlay layer and the top anti-pulling-crack component of the asphalt surface layer can be made of polyester glass fiber cloth or glass fiber grating type geotextile.

Compared with the prior art, the invention has the following technical effects:

1. according to the invention, the anchoring holes are formed in the old pavement steps, the anchoring nails penetrate through the anti-pulling-crack components and are inserted into the anchoring holes, so that the stability of the connection between the anti-pulling-crack components and each layer of steps is enhanced, the purpose of enhancing the stability of the connection structure of the new pavement and the old pavement is further achieved, meanwhile, the laid anti-pulling-crack components are compressed by the constructed new pavement structure, and with the continuous construction of the new pavement structure, the accumulated upper layer new pavement structure can further compress the anti-pulling-crack components at the lower part, so that the stability of the connection of the new pavement structure and the old pavement structure is enhanced, and in addition, the problem of displacement damage to the anti-pulling-crack components when the next layer of construction is carried out is also avoided.

2. According to the invention, the joints of the anti-pulling-crack component at the bottom of the subbase layer and the anti-pulling-crack component at the bottom of the base layer, the anti-pulling-crack component at the bottom of the base layer and the anti-pulling-crack component at the bottom of the asphalt surface layer, the anti-pulling-crack component at the bottom of the asphalt surface layer and the anti-pulling-crack component at the bottom of the overlay layer, and the anti-pulling-crack component at the bottom of the overlay layer and the anti-pulling-crack component at the top of the asphalt surface layer are all lapped, so that the joint tightness of the mutual attachment is ensured, and meanwhile, the lapped length covers the joint, so that the water flow is prevented from seeping downwards.

3. In the invention, the number of the roadbed top surface anchoring holes, the subbase layer top surface anchoring holes, the base layer top surface anchoring holes and the asphalt surface layer top surface anchoring holes is not less than 1, the arrangement intervals of the anchoring holes are determined by constructing an ABAQUS finite element numerical simulation model, carrying out mechanical response analysis of different positions of the pavement structure under the action of standard load (100KN double-circle uniform load), obtaining the optimal arrangement distance of the anchoring holes when the displacement difference of the two sides of the splicing seams of the asphalt surface layer, the base layer and the subbase layer of the new and old pavement is the minimum through different attempts, therefore, the purposes of enhancing the connection strength of the bottom anti-pulling part of the subbase layer, the bottom anti-pulling part of the base layer, the bottom anti-pulling part of the asphalt surface layer, the bottom anti-pulling part of the overlay layer, the top anti-pulling part of the asphalt surface layer and each step surface layer are achieved.

4. According to the invention, the depths of the roadbed top surface anchoring hole, the subbase layer top surface anchoring hole, the base layer top surface anchoring hole and the asphalt surface layer top surface anchoring hole are analyzed by constructing an ABAQUS finite element numerical simulation model, and carrying out mechanical response analysis of different positions of a road surface structure under the action of standard load (100KN double-circle uniform load), so that the depth of the anchoring hole with the smallest displacement difference of two sides of a splicing seam of an asphalt surface layer of a new road surface and an old road surface, two sides of a splicing seam of the base layer and two sides of a splicing seam of the subbase layer is obtained as the optimal depth of the anchoring hole through different attempts, and the depth is used for enhancing the connection strength of each anti-spalling component and the step surface layer.

Drawings

In order to more clearly illustrate the present invention or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a joint of a new road surface and an old road surface after construction is completed;

wherein, 1, roadbed; 2. an underlayer; 3. a base layer; 4. an asphalt surface layer; 5. an anchoring hole on the top surface of the roadbed; 6. a sub-base bottom anti-spalling component; 7. anchoring nails on the top surface of the roadbed; 8. a base layer bottom anti-tear component; 9. the top surface of the subbase layer is provided with an anchoring hole; 10. the top surface of the subbase layer is provided with anchoring nails; 11. a sub-base layer top anti-spalling component; 12. a crack preventing component at the bottom of the asphalt surface layer; 13. anchoring holes on the top surface of the base layer; 14. anchoring nails on the top surface of the base layer; 15. a base top anti-rip component; 16. a tension crack prevention part at the bottom of the overlay; 17. anchoring holes on the top surface of the asphalt surface layer; 18. anchoring nails are arranged on the top surface of the asphalt surface layer; 19. the top of the asphalt surface layer is provided with a tension crack preventing component; 20. paving a lower layer with asphalt; 21. and paving an upper layer by using asphalt.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a splicing method for rebuilding and expanding new and old pavements, and the purpose of enhancing the connection stability of the new and old pavements is achieved.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 1, a splicing method for rebuilding and expanding a new road surface and an old road surface includes the following steps: excavating the old road surface and forming a plurality of steps; laying a tension crack prevention component at the bottom of the excavation face and extending the tension crack prevention component to the top surface of the first-stage step, drilling an anchoring hole downwards on the tension crack prevention component at the bottom of the excavation face to be below the bottom of the excavation face and penetrating the anchoring hole through an anchoring nail for fixing, and pouring a first new road surface layer on the surface of the tension crack prevention component at the bottom of the excavation face and butting the first-stage step; continuously laying an anti-cracking component on the top surface of the first step and extending the anti-cracking component to the top surface of the second step, wherein the anti-cracking component on the top surface of the first step and the anti-cracking component extending upwards from the bottom of the excavation surface form a lap joint area, laying an anti-cracking component on the top surface of the first new pavement layer and extending the anti-cracking component to the lap joint area to complete the covering of the lap joint area, arranging anchoring holes on the anti-cracking component on the top surface of the first step and in the lap joint area to be below the top surface of the first step and fixing the anchoring holes by using anchoring nails to penetrate through the anchoring holes, and pouring a second new pavement layer on the anti-cracking component on the top surface of the first new pavement layer and the anti-cracking component on the top surface of the first step and butting the second step; repeating the construction until the Nth step is butted with the Nth new pavement layer, and completing splicing construction of the new pavement and the old pavement; according to the invention, the anchoring holes are formed in the old pavement steps, the anchoring nails penetrate through the anti-pulling-crack components and are inserted into the anchoring holes, so that the stability of the connection between the anti-pulling-crack components and each layer of steps is enhanced, the purpose of enhancing the stability of the connection structure of the new pavement and the old pavement is further achieved, meanwhile, the laid anti-pulling-crack components are compressed by the constructed new pavement structure, and with the continuous construction of the new pavement structure, the accumulated upper layer new pavement structure can further compress the anti-pulling-crack components at the lower part, so that the stability of the connection of the new pavement structure and the old pavement structure is enhanced, and in addition, the problem of displacement damage to the anti-pulling-crack components when the next layer of construction is carried out is also avoided.

Referring to fig. 1, a plurality of old road surface steps are three layers, namely, a top surface of a roadbed 1, a subbase layer 2, a base layer 3 and an asphalt surface layer 4 from bottom to top; paving an underlayer bottom anti-pulling-crack component 6 on the top surface of the roadbed, extending the underlayer bottom anti-pulling-crack component to the top surface of the underlayer along the step, downwards drilling an underlayer top surface anchoring hole 5 on the underlayer bottom anti-pulling-crack component 6, fixing the underlayer top surface anchoring hole 5 through a roadbed top surface anchoring nail 7, and constructing a new underlayer base layer on the underlayer bottom anti-pulling-crack component 6 and butting the new underlayer base layer with the old underlayer step of the pavement; laying a base layer bottom anti-pulling part 8 on the top surface of the base layer and extending the base layer bottom anti-pulling part to the top surface of the base layer along the step, laying a base layer top anti-pulling part 11 on the top surface of the base layer of the new pavement and extending the base layer bottom anti-pulling part to the overlapping area to complete the covering of the overlapping area, drilling a base layer top anchoring hole 9 on the base layer bottom anti-pulling part 8 and the overlapping area, fixing the base layer top anchoring hole 9 by penetrating a base layer top anchoring nail 10 through the base layer top anchoring hole 9, and constructing a new pavement base layer on the base layer bottom anti-pulling part 8 and the base layer top anti-pulling part 11 and butting the step of the old pavement base layer; paving an asphalt surface layer bottom anti-pulling crack part 12 on the top surface of the base layer and extending the asphalt surface layer bottom anti-pulling crack part to the top surface of the asphalt surface layer 4 along the step, paving a base layer top anti-pulling crack part 15 on the top surface of the base layer of the new pavement and extending the base layer bottom anti-pulling crack part 12 and the base layer top anti-pulling crack part extending the base layer top surface to the overlapping area to complete the covering of the overlapping area, punching base layer top surface anchoring holes on the asphalt surface layer bottom anti-pulling crack part 12 and the overlapping area and fixing the base layer top surface anchoring holes by penetrating the base layer top surface anchoring holes 13 through base layer top surface anchoring nails 14, and constructing a new pavement asphalt surface layer on the asphalt surface layer bottom anti-pulling crack part 12 and the base layer top anti-pulling crack part 15 and butting the step of the old pavement asphalt surface layer 4; paving an overlaying layer bottom anti-pulling-crack component 16 on the top surface of the asphalt surface layer 4, forming a lap joint area with an asphalt surface layer bottom anti-pulling-crack component 12 extending upwards from the bottom surface of the base layer, paving an asphalt surface layer top anti-pulling-crack component 19 on the top surface of the new pavement asphalt surface layer 4, extending to the lap joint area to complete the covering of the lap joint area, drilling asphalt surface layer top surface anchoring holes 17 on the overlaying layer bottom anti-pulling-crack component 16 and the lap joint area, fixing the asphalt surface layer top surface anchoring holes 17 through asphalt surface layer top surface anchoring nails 18, paving an asphalt overlaying lower layer 20 on the overlaying layer bottom anti-pulling-crack component 16 and the asphalt surface layer top anti-pulling-crack component 19, and paving an asphalt overlaying upper layer 21 on the asphalt overlaying lower layer 20.

Referring to fig. 1, the bottom of the subbase layer is prevented from being pulled and cracked part and the bottom of the base layer is prevented from being pulled and cracked part 8, the bottom of the base layer is prevented from being pulled and cracked part 8 and the bottom of the asphalt surface layer is prevented from being pulled and cracked part 12, the bottom of the asphalt surface layer is prevented from being pulled and cracked part 16, the bottom of the overlay layer is prevented from being pulled and cracked part 16 and the top of the asphalt surface layer are prevented from being pulled and cracked the joints of the parts are all lapped, the lapping length is not less than 10cm, the tightness of the joint is guaranteed, meanwhile, the lapped length covers the joints, and the infiltration of water flow is avoided.

Referring to fig. 1, the number of the roadbed top surface anchoring holes 5, the sub-base layer top surface anchoring holes 9, the base layer top surface anchoring holes 13 and the asphalt surface layer top surface anchoring holes 17 is not less than 1, the arrangement intervals of the anchoring holes are determined by constructing an ABAQUS finite element numerical simulation model, performing mechanical response analysis of different positions of the pavement structure under the action of standard load (100KN double-circle uniform load), obtaining the optimal arrangement distance of the anchoring holes when the displacement difference of the two sides of the splicing seams of the asphalt surface layers of the new and old pavements, the two sides of the splicing seams of the base layer and the two sides of the splicing seams of the subbase layer 2 is the minimum through different attempts, thereby achieving the purpose of enhancing the connection strength of the bottom anti-pulling part 6 of the subbase layer, the bottom anti-pulling part 8 of the base layer, the bottom anti-pulling part 12 of the asphalt surface layer, the bottom anti-pulling part 16 of the overlay layer, the top anti-pulling part of the asphalt surface layer and each step surface layer.

Referring to fig. 1, parameters L1, L2, L3, L4 and H related to the present invention are obtained by constructing an ABAQUS finite element numerical simulation model (examples of basic parameters of the model are shown in the following table), primarily simulating the numerical values of the parameters L1, L2, L3, L4 and H, performing mechanical response analysis of different positions of a pavement structure under the action of standard load (100KN double-circle uniform load), and obtaining parameter combinations as design parameters when displacement differences of points a and B at two sides of a splicing seam of an asphalt pavement surface layer of a new and old pavement, points C and D at two sides of a splicing seam of a base layer 3, and points E and F at two sides of a splicing seam of a base layer 2 are all minimum through different attempts;

wherein L1 is the length of the sub-base bottom anti-rip component;

wherein L2 is the length of the sub-base top anti-rip feature;

wherein L3 is the length of the base layer top anti-rip feature;

wherein L4 is the length of the top anti-pulling part of the asphalt surface course;

wherein H is the depth of the anchoring hole;

referring to fig. 1, at least one sub-base top surface anchoring hole 9 is located at the joint of the base bottom anti-crack component 8 and the sub-base top anti-crack component 11, at least one base top surface anchoring hole 13 is located at the joint of the asphalt surface bottom anti-crack component 12 and the base top anti-crack component 15, and at least one asphalt surface top surface anchoring hole 17 is located at the joint of the overlay bottom anti-crack component 16 and the asphalt surface top anti-crack component; further achieve the purpose of enhancing the connection strength of each anti-pulling part and each step surface layer.

Referring to fig. 1, the base bottom anti-pulling-apart component 8 and the base top anti-pulling-apart component 11, the asphalt surface layer bottom anti-pulling-apart component 12 and the base top anti-pulling-apart component 15, and the overlapping length of the overlaying layer bottom anti-pulling-apart component 16 and the asphalt surface layer top anti-pulling-apart component are not less than 10 cm; the tightness of the mutual attachment is ensured, and meanwhile, the joint is covered by the overlapped length, so that the water flow infiltration is avoided.

Furthermore, after the old road surface is excavated, the surface layer of the step is leveled, so that the anti-pulling-crack component can be smoothly laid conveniently.

Furthermore, the bottom anti-pulling-crack component 6 of the subbase layer, the bottom anti-pulling-crack component 8 of the base layer, the bottom anti-pulling-crack component 12 of the asphalt surface layer, the bottom anti-pulling-crack component 16 of the overlay layer and the top anti-pulling-crack component of the asphalt surface layer can be made of polyester glass fiber cloth or glass fiber grating type geotextile.

The adaptation according to the actual needs is within the scope of the invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.