CN201089875Y - Pavement structure of concrete new-old pavement anastomosis part for broadening road - Google Patents

Abstract

The utility model discloses a road surface structure which is used for a joint between a new concrete road surface and an old concrete road surface when a road is widened, wherein, a cement concrete rigid plate is arranged on a basal layer of the new concrete road surface, one side of the cement concrete rigid plate extends on the basal layer of the old concrete road surface; a plurality of plain steel bars are arranged in the longitudinal seam which is below the cement concrete rigid plate and where the new and the old road surfaces are connected; a pull rod is arranged on the joint between the cement concrete plate of the old road surface and the cement concrete rigid plate, and the part of the pull rod, which is arranged in the cement concrete plate of the old road surface, is tightly filled in with expansive concrete. Aiming at the problem existing in the prior art that the vertical shearing stress is easily generated in the road surface structure due to the differential settlement of the joint between the new and the old road surfaces, the utility model is provided with the armored concrete plates and fully utilizes the tensile property of the reinforcing steel bars to bear a part of stress, thereby avoiding the settlement of the joint, further ensuring that the whole road surface is not damaged and effectively preventing the appearance of the longitudinal seam between the new and the old road surfaces; moreover, the effects are obvious.

Description

Pavement structure for road widening at the junction of old and new concrete pavement

technical field

The utility model relates to a road surface structure at the plane interconnection of roads, in particular to a road surface structure used at the plane longitudinal interconnection of roads in road widening.

Background technique

With the rapid development of road construction in our country, there are more and more constructions for the widening and reconstruction of old roads. However, due to the unevenness of the old and new roadbeds, the longitudinal joints that settle at the junction of the old and new roads have long been a technical problem that is difficult to solve completely. , especially for the old cement concrete pavement, where the new and old pavement meets, it cannot be well graded and lapped like the asphalt concrete pavement.

At present, according to the current "Code for Design of Highway Subgrade" JTG D30-2004, the main measure to prevent the formation of longitudinal joints after widening the old road is to open the subgrade, as shown in Figure 1, namely: the blank in Figure 1 The area is the old road structure. The right side of Figure 1 is the pavement structure section of the newly built road, which are the asphalt surface layer 1, the base layer 2 and the subbase layer 3 of the newly built road from top to bottom; A biaxially stretched geogrid is laid on each step, and A, B and C of the reference numerals are also the overlapping range of the geogrid, which is generally at least 50 centimeters. For the pavement structure at the junction of the old and new roads, the above-mentioned roadbed opening treatment method is used. The disadvantage is that this treatment method is not suitable for the mutual connection of cement concrete pavement, so it cannot effectively prevent the widening of the longitudinal joint of the pavement. Formation, for the road surface of the line that undertakes heavy transportation tasks, the rainwater that infiltrates after the cracks will further damage the subbase and accelerate the expansion of the cracks. As the cracks continue to expand, the load-bearing capacity and durability of the road surface will be seriously affected. adverse effects. Therefore, it is urgent to find practical measures.

Utility model content

In order to overcome the drawbacks in the above-mentioned prior art, the utility model provides a pavement structure for the junction of old and new concrete roads in road widening, which can effectively prevent the formation of longitudinal joints at the joints of new and old roads in road widening.

In order to solve the above-mentioned technical problems, the technical solution of the utility model for the road surface structure at the junction of the old and new concrete road surfaces in the road widening is to set a cement concrete rigid board on the base of the new concrete road surface, and the cement concrete rigid board One side of the extension is overlapped to the base layer of the old pavement, and a plurality of light round steel bars are arranged at the longitudinal seam where the old and new pavement joins under the cement concrete rigid slab; Tie rods are arranged at the joints of the slabs, and the inside of the tie rods located in the old pavement cement concrete slab is filled and compacted with expansive concrete.

The utility model is used for the pavement structure at the junction of old and new concrete pavement in road widening, wherein, one side of the cement concrete rigid plate is extended and lapped to 50 centimeters of the old pavement. The distance between the smooth round steel bar and the bottom surface of the cement concrete rigid slab is equal to 1/3 of the thickness of the cement concrete rigid slab. The distance between every two adjacent light round steel bars is 15 to 30 cm. The diameter of the smooth round steel bar is 8 millimeters, and its length is 90 centimeters, and the position of the smooth round steel bar in the axial direction is basically aligned with the longitudinal joint connecting the old and new road surfaces.

Compared with the prior art, the utility model has the beneficial effects that: in the prior art, the uneven settlement at the joint of the old and new pavement is likely to generate vertical shear stress in the pavement structure, and the utility model is provided with reinforced concrete After the slab, the tensile performance of the steel bar can be fully utilized to bear this part of the stress, so that the seam does not sink, so as to ensure that the road surface is not damaged as a whole. Longitudinal seams are produced, the effect is remarkable.

Description of drawings

Fig. 1 is the sectional view of general pavement composition in the prior art;

Fig. 2 is a sectional view of the pavement structure of the present invention.

Below is the description of the main reference signs in the accompanying drawings of the utility model description:

1——Two-way geogrid 2——Asphalt surface layer 3, 26——Base course

4. 27——Subbase 21——Old road surface 22——Tie rod

23——Round steel bar 24——Section of round steel bar 25——Cement concrete rigid plate

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figure 2, the pavement structure of the utility model used in the junction of new and old concrete pavements in road widening is to set a cement concrete rigid board 25 above the base 26 of the new concrete pavement, and one side of the cement concrete rigid board 25 Extend and lap onto the base of the old pavement 21, and its cement concrete rigid plate 25 extends and lap to the 50 centimeters of the old pavement, as shown in reference sign D in Fig. 2, the specific operation is: At the junction, the 50 cm wide part of the existing cement concrete slab in the old pavement is removed, and a cement concrete rigid slab 25 is formed by pouring together with the new pavement part. During pouring, a plurality of smooth round steel bars 23 are arranged at the longitudinal seam where the old and new road surfaces meet under the cement concrete rigid plate 25, and the distance between every two adjacent smooth round steel bars 23 is 15 to 30 cm. The up and down concrete position of its light round reinforcing bar 23 is on the height of 1/3 plate thickness apart from cement concrete rigid plate 25 bottom surfaces, and the diameter of described smooth round reinforcing bar 23 is 8 millimeters, as shown in smooth round reinforcing bar section 24 among the Fig. 2, Its length is 90 centimeters, and the position of the smooth round steel bar 23 in the axial direction is basically aligned with the longitudinal seam connecting the old and new road surfaces, as shown by reference signs D and E in FIG. 2 . Drill a hole in the middle part of the old pavement 21 cement concrete slab, and in the hole, a pull rod 22 is arranged according to the provisions of Article 5.1.3 of the "Code for Design of Highway Cement Concrete Pavement" JTG D40-2002, and the pull rod 22 is basically in the axial direction. On the joint centered with the concrete slab in the old and new pavement, one end of the tie rod 22 is poured in the concrete rigid slab of the new road surface, and the other end extends into the hole of the old cement concrete slab, and when the tie rod 22 is stretched into the hole, That part is filled with expansive concrete to make it densely filled.

Although the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the utility model, without departing from the purpose of the utility model and the protection scope of the claims, many deformations can be made, and these all belong to the protection list of the utility model.

Claims (5)

1. one kind is used for the road structure that road is widened the new old pavement of concrete joint, it is characterized in that: the cement concrete rigid slab is set on the basic unit on as placed concrete road surface, one side of described cement concrete rigid slab is extended and is snapped into above the basic unit of old pavement, is positioned at the longitudinal joint place that new old pavement joins and is provided with many plain bars below described cement concrete rigid slab; Be provided with pull bar at old pavement cement concrete slab and described cement concrete rigid slab joint, the inside that is arranged in the pull bar of old pavement cement concrete slab adopts the expansive concrete filling closely knit.

2. according to claim 1ly be used for the road structure that road is widened the new old pavement of concrete joint, it is characterized in that: a side of described cement concrete rigid slab is extended 50 centimeters that snap into old pavement.

3. according to claim 1ly be used for the road structure that road is widened the new old pavement of concrete joint, it is characterized in that: described plain bar equals the thickness of 1/3 cement concrete rigid slab apart from the distance of cement concrete rigid slab bottom surface.

4. according to claim 1ly be used for the road structure that road is widened the new old pavement of concrete joint, it is characterized in that: the distance between per two adjacent plain bars is 15 to 30 centimetres.

5. according to claim 1ly be used for the road structure that road is widened the new old pavement of concrete joint, it is characterized in that: the diameter of described plain bar is 8 millimeters, its length is 90 centimetres, the basic centering of longitudinal joint that described plain bar position in the axial direction and new old pavement join.

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