Widening structure of old road surface and construction method thereof

Abstract

The application discloses a widening structure of an old road surface and a construction method thereof, and belongs to the technical field of road construction. The widening structure of the old road surface comprises a new base layer, a side part of an old base layer of the old road surface is extended and filled to form the new base layer, an upper part of a joint of the new base layer and the old base layer is formed with a counter-digging groove, and opposite side walls at a groove opening of the counter-digging groove are formed with accommodating notches; first concrete is poured into the counter-digging groove and the accommodating notches to be solidified to form a load-releasing plate; a plurality of prefabricated supporting columns are anchored at lower ends thereof into the first concrete in the accommodating notches and stretch above the accommodating notches at upper ends thereof; second concrete is poured into the new base layer and breaking notches formed in a side part of an old surface layer to be solidified to form a new surface layer, and the upper ends of the prefabricated supporting columns are embedded in the second concrete; and a plurality of force transmission rods are embedded in the new surface layer and arranged transversely above the joint. The application solves the problem that the existing road surface structure of the old road widening construction is prone to form pavement diseases such as staggered steps and arching.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a widening structure of an old road surface and a construction method thereof. BACKGROUND

[0002] In the widening construction of an old road, due to the uneven settlement of new and old roadbeds, with the passage of time, the plastic cumulative deformation of the new roadbed continues to grow, and the deformation difference between the new and old roadbeds is reflected through the base layer, causing the surface layer to crack and affecting the use of the road surface. Rainwater enters the roadbed along the cracks at the reflection cracks, and road diseases such as abutment and arching may occur, reducing the service life of the road and seriously affecting the safety of driving.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be regarded as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application provides a widening structure of an old road surface and a construction method thereof to solve the problem that the existing road surface structure of the old road widening construction is prone to form road diseases such as abutment and arching.

[0005] To achieve the above-mentioned purpose, a widening structure of an old road surface is provided, comprising:

[0006] a new base layer, the old road surface comprising an old base layer and an old surface layer paved on the old base layer, the old base layer being filled to form the new base layer along the side part of the old base layer in the length direction of the road surface, an upper part of the joint of the new base layer and the old base layer being formed with a back-digging groove, and opposite side walls at the groove opening of the back-digging groove being respectively formed with accommodation notches;

[0007] a first concrete, which is poured into the back-digging groove and the accommodation notches to consolidate a load-releasing plate;

[0008] a plurality of prefabricated supporting columns, the lower end of the prefabricated supporting column being anchored in the first concrete in the accommodation notches, and the upper end of the prefabricated supporting column extending above the accommodation notches;

[0009] a second concrete, the side part of the old surface layer being provided with a breaking notch, the second concrete being poured into the new base layer and the breaking notch to consolidate a new surface layer, and the upper end of the prefabricated supporting column being embedded in the second concrete;

[0010] a plurality of force transmission rods, the force transmission rods being embedded in the new surface layer, the force transmission rods being arranged vertically above the joint, and a plurality of the force transmission rods being arranged in the length direction of the joint.

[0011] Further, the length of the opposite two sides of the counter-digging groove extending into the new base layer and the old base layer is greater than or equal to 25 cm.

[0012] Further, the old base layer comprises a first filling layer and a second filling layer filled on the first filling layer, the new base layer comprises a third filling layer and a fourth filling layer, the third filling layer is connected to the first filling layer, the fourth filling layer is filled on the third filling layer, the fourth filling layer is connected to the second filling layer, and the connection between the fourth filling layer and the second filling layer is counter-digged to form the counter-digging groove.

[0013] Further, the first filling layer and the third filling layer are 4% cement stabilized stone chip filling.

[0014] Further, the second filling layer and the fourth filling layer are 6% cement stabilized stone chip filling.

[0015] Further, a post-pouring gap is formed between the unloading plate and the upper part of the side wall of the notch, and the post-pouring gap is filled with a sealing material.

[0016] Further, the width of the post-pouring gap is 0.3-1 cm, and the depth of the post-pouring gap is 0.8-4 cm.

[0017] Further, the sealing material is hot melt asphalt.

[0018] The present application provides a construction method of an old road pavement widening structure, comprising the following steps:

[0019] A new base layer is filled on the opposite two sides of the old base layer of the old road pavement, and the new base layer is arranged along the pavement direction of the old road pavement, so that the new base layer is connected to the old base layer.

[0020] A breaking notch is formed on the side of the old surface layer.

[0021] A counter-digging groove is formed by excavating the upper part of the joint of the new base layer and the old base layer, and a containing notch is formed on the opposite two side walls of the groove opening of the counter-digging groove.

[0022] A plurality of precast supporting columns are erected in the containing notch.

[0023] A first concrete is poured in the counter-digging groove and the containing notch to form an unloading plate, and the first concrete covers the lower end of the plurality of precast supporting columns.

[0024] Pouring second concrete in the new base layer and the broken gap to consolidate to form a new surface layer, and embedding a plurality of dowels in the second concrete, so that the dowels are arranged transversely above the joint, a plurality of the dowels are arranged along the length direction of the joint, and the second concrete covers a plurality of the prefabricated supporting columns.

[0025] The old road pavement widening structure of the application has the advantages of convenient connection construction between the new and old pavements, simple process, large rigidity and strong bearing capacity of the load-releasing plate, and good relief of uneven settlement between the roadbeds, which greatly reduces the influence of the reflection cracks of the uneven settlement of the roadbed on the pavement, reduces the risk of surface cracking, and reduces the risk of rainwater infiltration. BRIEF DESCRIPTION OF DRAWINGS

[0026] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments with reference to the following drawings:

[0027] Fig. 1 FIG. 1 is a structural schematic diagram of an old road pavement widening structure according to an embodiment of the application.

[0028] Fig. 2 FIG. 2 is a structural schematic diagram of a side of a load-releasing plate according to an embodiment of the application.

[0029] Figs. 3-8 FIG. 3 is a schematic diagram of the construction method steps of the old road pavement widening structure according to an embodiment of the application. DETAILED DESCRIPTION

[0030] The application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only parts related to the application are shown in the drawings for ease of description.

[0031] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and embodiments.

[0032] REFERENCE Figs. 1-2 As shown in the drawings, the application provides an old road pavement widening structure, which comprises a new base layer 1, a load-releasing plate 2, a prefabricated supporting column 3 and a dowel 5.

[0033] Reference Fig. 1As shown, the old pavement includes an old subbase 6 and an old surface course 8. The old surface course 8 is paved on the old subbase 6. The side portions of the old subbase 6 extend along the length of the pavement to form the new subbase 1.

[0034] An upper portion of the junction between the new subbase 1 and the old subbase 6 is formed with a counter-digging groove a. Opposite side walls at the opening of the counter-digging groove a are formed with receiving notches b, respectively.

[0035] As a preferred embodiment, the lengths of the opposite sides of the counter-digging groove a extending into the new subbase 1 and the old subbase 6 are greater than or equal to 25 cm, respectively.

[0036] The first concrete is poured into the counter-digging groove a and the receiving notches b to consolidate to form the load-relief slab 2. The first concrete poured into the receiving notches consolidates to form the flange plates 21 of the upper portions of the opposite sides of the load-relief slab.

[0037] There are multiple precast support columns 3. The lower ends of the precast support columns 3 are anchored in the first concrete in the receiving notches b. The upper ends of the precast support columns 3 extend above the receiving notches b. The multiple precast support columns are arranged along the length of the old pavement. Preferably, the multiple precast support columns are arranged at equal intervals along the length of the old pavement.

[0038] The side portions of the old surface course 8 are provided with breaking notches c. The second concrete is poured into the new subbase 1 and the breaking notches c to consolidate to form the new surface course 4. The upper ends of the precast support columns 3 are embedded in the second concrete (i.e. the new surface course). The lower ends of the precast support columns are embedded in the flange plates 21 of the load-relief slab 2.

[0039] There are multiple dowels 5. The dowels 5 are embedded in the new surface course 4. The dowels 5 are arranged transversely above the junction. The multiple dowels 5 are arranged along the length of the junction. Preferably, the multiple dowels 5 are arranged along the length of the junction (i.e. the length of the old pavement).

[0040] The widened structure of the old pavement has the advantages of convenient connection construction between the new and old pavements, simple process, large rigidity and strong bearing capacity of the load-relief slab, good relief of uneven settlement between the roadbeds, great reduction of the influence of the reflection cracks caused by the uneven settlement of the roadbeds on the pavement, reduction of the risk of cracking of the surface course, and reduction of the risk of rainwater infiltration. On the other hand, the infiltration path of the rainwater from the pavement construction joint to the roadbed construction joint is lengthened, the gaps on the two sides of the slab are treated, the risk of rainwater infiltration is reduced, the durability of the roadbed is improved, and the maintenance cost in the later period is reduced.

[0041] Continuing to refer to Fig. 1 , the old subbase 6 includes a first fill layer 61 and a second fill layer 62 filled on the first fill layer 61.

[0042] The new base 1 comprises a third filling layer 11 and a fourth filling layer. The third filling layer 11 is connected to the first filling layer 61. The fourth filling layer is filled on the third filling layer 11. The fourth filling layer is connected to the second filling layer 62. The connection between the fourth filling layer and the second filling layer 62 is back-dug to form a back-dug groove.

[0043] The first filling layer 61 and the third filling layer 11 are 4% cement stabilized stone chip filling.

[0044] The second filling layer 62 and the fourth filling layer are 6% cement stabilized stone chip filling.

[0045] As a preferred embodiment, a post-pouring gap is formed between the unloading plate 2 and the upper part of the side wall of the notch. The post-pouring gap is filled with sealing material 7. The width of the post-pouring gap is 0.3-1 cm, and the depth of the post-pouring gap is 0.8-4 cm.

[0046] The sealing material 7 is hot melt asphalt. In this embodiment, the seepage path of rainwater from the road surface construction joint to the roadbed construction joint is lengthened, and the post-pouring gap of the flange plate on both sides of the unloading plate is treated with sealing material, reducing the risk of rainwater infiltration, improving the durability of the roadbed, and reducing the maintenance cost in the later period.

[0047] Referring to Figs. 3-8 , the application provides a construction method of a widened structure of an old road surface, comprising the following steps:

[0048] S1: filling to form a new base 1 on opposite sides of an old base 6 of an old road surface, the new base 1 being arranged along the road surface direction of the old road surface, so that the new base 1 is connected to the old base 6.

[0049] S2: breaking to form a broken notch c on the side of the old surface layer 8.

[0050] S3: excavating to form a back-dug groove a at the upper part of the intersection of the new base 1 and the old base 6, and forming a receiving notch b on the opposite side walls of the groove mouth of the back-dug groove a, respectively.

[0051] S4: erecting a plurality of precast support columns 3 in the receiving notch b.

[0052] S5: pouring first concrete in the back-dug groove a and the receiving notch b to consolidate to form an unloading plate 2, the first concrete covering the lower end of the plurality of precast support columns 3.

[0053] S6: pouring second concrete in the new base 1 and the broken notch c to consolidate to form a new surface layer 4, and embedding a plurality of dowels 5 in the second concrete, so that the dowels 5 are arranged transversely above the intersection, the plurality of dowels 5 being arranged along the length direction of the intersection, and the second concrete covering the plurality of precast support columns 3.

[0054] The geogrid is laid on the force relief plate.

[0055] The overlapping lengths of the opposite sides of the geogrid with the new base layer and the old base layer are greater than or equal to 25 cm.

[0056] The laying of the geogrid on the force relief plate can better relieve uneven settlement between the roadbeds, greatly reduce the influence of the reflection cracks formed by uneven settlement of the roadbeds on the pavement, reduce the risk of cracking of the surface layer, and reduce the risk of rainwater infiltration.

[0057] In the embodiment, the new base layer needs to be filled and compacted in layers, and the compactness needs to meet the requirements of the design and the specification. The old surface layer of the old road is first cut and then broken to form a breaking gap, so as to avoid damage to the old surface layer during breaking, and the breaking width is not less than 50 cm.

[0058] The construction joint of the new and old base layers is back-dug, to ensure the compaction quality of the base layer, the new and old base layers are first laid and rolled as a whole, and then back-dug, the excavation depth should be deep into the base layer bottom, and the excavation width of each of the new and old base layers is not less than 25 cm. After excavation, a back-dug groove is formed, which penetrates the base layer and spans the new and old pavements.

[0059] The side walls of the back-dug groove are brushed with a concrete interface agent, and C15 or above strength concrete is cast in situ in the back-dug groove and the accommodation gap. When the geogrid is laid on the force relief plate, the geogrid should be laid at least 25 cm beyond the two sides of the force relief plate, and is fixed on the new and old base layers by steel nails or other reliable methods.

[0060] During the second concrete construction of the new and old surface layers, the surface layer construction joint is consistent with the position of the construction joint of the new and old base layers, the construction of the dowel bar should be arranged across the new and old pavements, and hot melt asphalt is poured into the post-pouring gap for sealing.

[0061] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A structure for widening an existing road surface, characterized in that, The application relates to a new base, an old pavement including an old base and an old surface layer paved on the old base, side portions of the old base are filled to form the new base along the pavement length direction, an upper portion of a joint of the new base and the old base is formed with a back-digging groove, and opposite two side walls at a groove opening of the back-digging groove are respectively formed with accommodating notches. A first concrete is poured into the back-digging groove and the accommodating notches to consolidate a force-releasing plate. A plurality of prefabricated supporting columns are anchored in the first concrete in the accommodating notches, and upper ends of the prefabricated supporting columns are arranged above the accommodating notches. A second concrete is poured into the new base and the breaking notches to consolidate a new surface layer, and upper ends of the prefabricated supporting columns are embedded in the second concrete. A plurality of force transmission rods are embedded in the new surface layer, the force transmission rods are arranged above the joint, and the plurality of force transmission rods are arranged along the length direction of the joint. The force-releasing plate is paved with geogrids, and opposite two sides of the geogrids are overlapped on the new base and the old base. The length of the back-digging groove extending to the new base and the old base is greater than or equal to 25 cm.

2. The widening structure of an old pavement according to claim 1, characterized in that, The old base includes a first filling layer and a second filling layer filled on the first filling layer, the new base includes a third filling layer and a fourth filling layer, the third filling layer is connected to the first filling layer, the fourth filling layer is filled on the third filling layer, the fourth filling layer is connected to the second filling layer, and the fourth filling layer and the second filling layer are connected at the back-digging groove.

3. The widening structure of an old pavement according to claim 1, characterized in that, The first filling layer and the third filling layer are 4% cement stabilized stone chip filling.

4. The widening structure of an old pavement according to claim 3, characterized in that, The second filling layer and the fourth filling layer are 6% cement stabilized stone chip filling.

5. The widening structure of an old pavement according to claim 3, wherein A post-pouring gap is formed between the force-releasing plate and the upper portion of the side wall of the accommodating notch, and a sealing material is poured into the post-pouring gap.

6. The widening structure of an old pavement according to claim 1, wherein The width of the post-pouring gap is 0.3-1 cm, and the depth of the post-pouring gap is 0.8-4 cm.

7. The widening structure of an old pavement according to claim 6, characterized in that, The sealing material is hot-melt asphalt.

8. The widening structure of an old pavement according to claim 6, wherein The application further discloses a method for constructing the new base and the new surface layer.

9. A method of constructing a widened structure of an old pavement as claimed in any one of claims 1 to 8, characterized in that, A new base is filled on opposite two sides of an old base of an old pavement along the pavement direction of the old pavement, so that the new base is connected to the old base. A breaking notch is formed on a side portion of the old surface layer. A back-digging groove is excavated on an upper portion of a joint of the new base and the old base, and opposite two side walls at a groove opening of the back-digging groove are respectively formed with accommodating notches. A plurality of prefabricated supporting columns are arranged in the accommodating notches. A first concrete is poured into the back-digging groove and the accommodating notches to consolidate a force-releasing plate, and the first concrete covers lower ends of the plurality of prefabricated supporting columns. A second concrete is poured into the new base and the breaking notches to consolidate a new surface layer, and a plurality of force transmission rods are embedded in the second concrete, so that the force transmission rods are arranged above the joint, the plurality of force transmission rods are arranged along the length direction of the joint, and the second concrete covers the plurality of prefabricated supporting columns. ​

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