CN215629085U

CN215629085U - New and old cement road surface mosaic structure of highway

Info

Publication number: CN215629085U
Application number: CN202121453936.1U
Authority: CN
Inventors: 何百川; 王展亮; 罗茜楠
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-01-25
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses a splicing structure of a new and old cement road surface of a highway, which comprises an old road bed, an old road base layer and an old road surface which are sequentially arranged from bottom to top, wherein a newly-built road bed and a newly-built cement stabilized macadam base layer are sequentially arranged on one side of the old road bed, the old road base layer and one side of the old road surface from bottom to top, the newly-built cement concrete base layer and asphalt stabilized macadam base layer are paved on the old road surface and the newly-built cement stabilized macadam base layer, the newly-built cement concrete base layer covers the splicing part of the old road surface and the newly-built cement stabilized macadam base layer, and a newly-built asphalt concrete surface layer is arranged on the newly-built cement concrete base layer and the asphalt stabilized macadam. The new and old road surface concatenation surface course of this patent is unified to be used asphalt concrete basic unit, and the road surface of widening adopts concrete basic unit, and new basic unit is directly taken and is spread on old concrete pavement board, has avoided "bar planting" in the work progress and old road surface mill the plane problem of digging.

Description

New and old cement road surface mosaic structure of highway

Technical Field

The utility model is applied to the field of splicing new and old road surfaces of highways, and particularly relates to a splicing structure of new and old cement road surfaces of highways.

Background

According to the data of the traffic transportation department, the total mileage of rural roads in China exceeds 404 kilometers, the scale of the rural roads is huge, the economy of China is continuously developed, and new requirements on the construction of good rural roads are provided by 'four good rural roads'. In order to improve the quality of rural highways, a large number of rural highways need to be upgraded and rebuilt, so that the technology of widening and paving the asphalt pavement on the old cement pavement has wide application prospect. In the process of reconstruction and extension of rural highways, due to the fact that materials at the splicing positions of new and old roadbeds have difference of solidification time, differential settlement is generated between the new and old roadbeds, and the defects of cracks, slab staggering, edge gnawing and the like are generated on the new and old pavements at the splicing positions.

At present, two splicing technologies adopted by new and old cement pavements are mainly adopted, namely, a power transmission rib is arranged at a splicing position; and secondly, the road surface structure layer is lapped and processed in a step mode. The two measures can delay the occurrence of diseases to a certain extent, but under the action of vehicle load, the force transmission rib at the splicing position of the new road and the old road is often sheared or corroded, so that the splicing technology fails.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a splicing structure of new and old cement road surfaces of a highway aiming at the defects of the prior art.

In order to solve the technical problem, the splicing structure for the new and old cement pavements of the highway comprises an old road subgrade, an old road base layer and an old road surface which are sequentially arranged from bottom to top, wherein a newly-built road subgrade and a newly-built cement stabilized macadam base layer are sequentially arranged on one side of the old road subgrade, the old road base layer and the old road surface from bottom to top, a newly-built cement concrete base layer and asphalt stabilized macadam are paved on the old road surface and the newly-built cement stabilized macadam base layer, the newly-built cement concrete base layer covers the splicing part of the old road surface and the newly-built cement stabilized macadam base layer, and a newly-built asphalt concrete surface layer is arranged on the newly-built cement concrete base layer and the asphalt stabilized macadam.

As a possible implementation manner, further, the newly-built roadbed lower datum line and the old roadbed lower datum line are located at the same horizontal height, and the newly-built roadbed upper datum line is arranged between the upper datum line and the lower datum line of the old roadbed.

As a possible implementation manner, further, the lower datum line of the newly-built cement stabilized macadam foundation coincides with the upper datum line of the newly-built roadbed, and the upper datum line of the newly-built cement stabilized macadam foundation is arranged between the upper datum line and the lower datum line of the old road surface.

As a possible embodiment, further, the level heights of the upper datum lines of the newly-built cement concrete base course and the asphalt stabilized macadam are equal, and the newly-built cement concrete base course covers the old road surface and the newly-built cement stabilized macadam base course simultaneously, and the asphalt stabilized macadam only covers the old road surface.

As a possible implementation manner, further, a force transmission assembly is embedded in the newly-built cement concrete base layer, and the force transmission assembly is positioned vertically above the splicing part of the old pavement and the newly-built cement stabilized macadam base layer.

As a possible implementation, it is further that the power transmission assembly includes three sets of parallel arrangement's lower floor's reinforcing bar, lower floor's reinforcing bar both ends are all through setting up muscle fixed connection, lower floor's reinforcing bar top correspondence is provided with three sets of parallel arrangement's upper reinforcing bar, and this upper reinforcing bar both ends are all through setting up muscle fixed connection, and the both ends of every lower floor's reinforcing bar of group all are through setting up muscle fixed connection rather than the both ends of the upper reinforcing bar of corresponding setting.

By adopting the technical scheme, the utility model has the following beneficial effects:

(1) the new and old road surface concatenation surface course of this patent is unified to be used asphalt concrete basic unit, and the road surface of widening adopts concrete basic unit, and new basic unit is directly taken and is spread on old concrete pavement board, has avoided "bar planting" in the work progress and old road surface mill the plane problem of digging.

(2) The construction efficiency is improved by directly paving the new base layer on the old concrete pavement slab.

(3) Through setting up the biography power subassembly, improve the anti shear capacity who splices the position, reduce the influence of old and new road bed differential settlement to the road surface.

(4) And asphalt stabilized macadam is filled between the newly-built asphalt concrete surface layer and the old pavement, so that the development of reflection cracks is delayed.

Drawings

The utility model is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a schematic cross-sectional view of the structure of the present invention;

fig. 2 is a schematic view of the force transfer assembly of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.

As shown in fig. 1-2, the utility model provides a new and old cement pavement splicing structure for a highway, which comprises an old roadbed 1, an old roadbed 2 and an old pavement 3 which are sequentially arranged from bottom to top, wherein a new roadbed 4 and a new cement stabilized macadam base layer 5 are sequentially arranged on one side of the old roadbed 1, the old roadbed 2 and the old pavement 3 from bottom to top, a lower datum line of the new roadbed 4 and a lower datum line of the old roadbed 1 are positioned at the same horizontal height, and an upper datum line of the new roadbed 4 is arranged between an upper datum line and a lower datum line of the old roadbed 2. The lower datum line of the newly-built cement stabilized macadam foundation 5 coincides with the upper datum line of the newly-built roadbed 4, and the upper datum line of the newly-built cement stabilized macadam foundation 5 is arranged between the upper datum line and the lower datum line of the old pavement 3. Old road surface 3 and newly-built cement stabilized macadam base course 5 upper berth are equipped with newly-built cement concrete base course 6 and asphalt stabilized macadam 7, and newly-built cement concrete base course 6 covers old road surface 3 and newly-built cement stabilized macadam base course 5's concatenation department, be provided with newly-built asphalt concrete surface course 8 on newly-built cement concrete base course 6 and the asphalt stabilized macadam 7. Newly-built cement concrete basic unit 6 and pitch stabilized macadam 7's last datum line level are equal, just newly-built cement concrete basic unit 6 covers old road surface 3 and newly-built cement stabilized macadam basic unit 5 simultaneously, and pitch stabilized macadam 7 only covers old road surface 3.

Furthermore, a force transmission assembly 9 is embedded in the newly-built cement concrete base layer 6, and the force transmission assembly 9 is positioned vertically above the splicing part of the old pavement 3 and the newly-built cement stabilized macadam base layer 5. Pass power subassembly 9 and include three parallel arrangement's lower floor's reinforcing bar 91, lower floor's reinforcing bar 91 both ends are all through setting up muscle 92 fixed connection, lower floor's reinforcing bar 91 top correspondence is provided with three parallel arrangement's of group upper reinforcing bar 93, and this upper reinforcing bar 93 both ends are all through setting up muscle 92 fixed connection, and every lower floor's reinforcing bar 91 both ends and the both ends of the upper reinforcing bar 93 of its corresponding setting of group all are through setting up muscle 92 fixed connection.

In the laying process: firstly, a newly-built concrete subbase layer, an old pavement surface layer and a base layer are in butt joint, and the elevation of the newly-built concrete subbase layer is slightly lower than that of the original cement concrete pavement surface layer, as shown in figure 1.

1) Newly paved roadbed with thickness hj5, and control elevation higher than that of old roadbed; during rolling, longitudinally rolling from two sides of the roadbed to the center according to three stages of primary rolling 2 times, secondary rolling 3 times and final rolling 2 times; the initial pressure is preferably low speed, the secondary pressure is preferably medium speed, and the final pressure is preferably high speed.

2) And detecting the compaction degree of the roadbed by a sand filling method, and paving a subbase layer after the compaction degree is detected to be qualified.

3) And newly laying a 3% cement stabilized macadam underlayment of thickness hj 4. The control elevation is higher than the elevation of the old road base course and slightly lower than the elevation of the old cement concrete pavement, and the elevation difference between the control elevation and the old cement concrete pavement is controlled to be 5-10 cm.

Secondly, erecting double-layer steel bars at the splicing seam position, adopting the following detailed steps,

1) erecting erection bars, wherein the diameter of each steel bar is 14-16 mm, and 1 steel bar is arranged at intervals of 120 cm.

2) 14 ~ 16mm are got to ligature lower floor's reinforcing bar, reinforcing bar diameter, and reinforcing bar horizontal separation is 30 ~ 40 cm. The lower layer steel bars and the vertical bars are bound by a splayed buckling method, and the binding steel wires are bound by 20-22 steel wires commonly.

3) 14 ~ 16mm are got to ligature upper reinforcing bar, reinforcing bar diameter, and reinforcing bar horizontal separation distance 30 ~ 40cm, upper reinforcing bar and lower floor's reinforcing bar interval 10 cm. The upper layer steel bars and the vertical bars are bound by a splayed buckling method, and the binding steel wires are bound by 20-22 steel wires commonly used.

And thirdly, filling asphalt stabilized macadam between the newly paved asphalt concrete surface layer and the old cement pavement.

1) Filling dense graded asphalt stabilized macadam ATB-25 between the newly paved asphalt concrete surface layer and the old cement pavement;

2) the construction requirement of the dense-graded asphalt stabilized gravel layer is required to be constructed and accepted according to the regulations of the technical Specification for construction of road asphalt pavements (JTG F40-2004).

And fourthly, paving a newly-built asphalt concrete surface layer.

1) And paving a newly-built asphalt concrete surface layer by adopting three layers: the upper surface layer is made of AC-13C fine particle type asphalt concrete with the thickness of 4cm, the middle surface layer is made of AC-20C medium particle type asphalt concrete with the thickness of 5cm, and the lower surface layer is made of AC-25C coarse particle type asphalt concrete with the thickness of 6 cm.

2) And the proportion and the gradation of the asphalt mixture are as follows:

the mineral aggregate gradation of the asphalt mixture meets the requirements of a target mixing ratio and a production mixing ratio;

② the asphalt dosage of the mixture: the production oil-stone ratio is controlled to be 0.2 percent.

3) The construction process of the newly-built asphalt concrete surface layer comprises the following steps:

the construction of the newly-built asphalt concrete surface layer is carried out according to the open traffic construction process of mixing, transporting, paving, compacting and forming and joint treatment, and the construction requirements are carried out according to the requirements of technical Specifications for road asphalt pavement construction (JTG F40-2004) and acceptance inspection.

The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.

Claims

1. The utility model provides a new and old cement road surface mosaic structure of highway, includes by the old road bed, old road bed and the old road surface of supreme setting gradually down, its characterized in that: one side of old road bed, old road bed and old road surface is by supreme newly-built road bed and the new cement stabilized macadam basic unit of being provided with according to the preface down, old road surface and the new cement stabilized macadam basic unit upper berth are equipped with newly-built cement concrete basic unit and asphalt stabilized macadam, and newly-built cement concrete basic unit covers old road surface and the concatenation department of newly-built cement stabilized macadam basic unit, be provided with newly-built asphalt concrete surface course on newly-built cement concrete basic unit and the asphalt stabilized macadam.

2. The new and old cement road surface splicing structure of the highway according to claim 1, which is characterized in that: the new roadbed lower datum line and the old roadbed lower datum line are located at the same horizontal height, and the new roadbed upper datum line is arranged between the upper datum line and the lower datum line of the old roadbed.

3. The new and old cement road surface splicing structure of the highway according to claim 2, wherein: the lower datum line of the newly-built cement stabilized macadam foundation coincides with the upper datum line of the newly-built roadbed, and the upper datum line of the newly-built cement stabilized macadam foundation is arranged between the upper datum line and the lower datum line of the old pavement.

4. The new and old cement road surface splicing structure of the highway of claim 3, which is characterized in that: newly-built cement concrete basic unit and pitch stabilized macadam's last datum line level are equal, just newly-built cement concrete basic unit covers old road surface and newly-built cement stabilized macadam basic unit simultaneously, and pitch stabilized macadam only covers old road surface.

5. The new and old cement road surface splicing structure of the highway according to claim 1, which is characterized in that: the power transmission assembly is buried in the newly-built cement concrete base layer, and is located the vertical top of the splicing department of old road surface and newly-built cement stabilized macadam base layer.

6. The new and old cement road surface splicing structure of the highway of claim 5, which is characterized in that: the power transmission assembly comprises three groups of lower-layer steel bars arranged in parallel, the two ends of the lower-layer steel bars are fixedly connected through the erection bars, the upper-layer steel bars arranged in parallel are correspondingly arranged above the lower-layer steel bars, the two ends of each upper-layer steel bar are fixedly connected through the erection bars, and the two ends of each lower-layer steel bar are fixedly connected with the two ends of the upper-layer steel bars arranged correspondingly.