Cast-in-place longitudinal continuous seamless prestressed reinforced concrete pavement surface layer and construction method

Abstract

The present invention discloses a cast-in-place longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer and a construction method. The structure includes a cast-in-place concrete slab, a longitudinal channel pipe, longitudinal prestressed reinforcement, an anchor, and a transverse post-cast strip. Anchor grooves are reserved transversely on the top surface of the cast-in-place concrete slab, with a plurality of anchor grooves distributed longitudinally. The longitudinal channel pipes are pre-buried in the cast-in-place concrete slab, with the ends of a single longitudinal channel pipe extending to anchor grooves of different rows, and longitudinal channel pipes in the same row are arranged continuously longitudinally through the anchor grooves, while longitudinal channel pipes in adjacent rows are arranged crosswise. The longitudinal prestressed reinforcement passes through the corresponding longitudinal channel pipes, and the ends of the longitudinal prestressed reinforcement are anchored in the anchor grooves by anchors after tensioning. The anchor grooves are formed into transverse post-cast strips by post-cast concrete. The present invention can ensure that the pavement is longitudinally continuous and seamless throughout, free of random transverse cracks, and has a simple structure, convenient construction, and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of road engineering, and in particular relates to a cast-in-place longitudinal continuous seamless prestressed reinforced concrete pavement surface layer and a construction method. Background Art

[0002] Continuously reinforced concrete pavement (CRCP) is a pavement structure with continuous steel bars arranged longitudinally and no shrinkage joints in the transverse direction. This pavement structure overcomes the driving discomfort and various diseases caused by the numerous joints in ordinary concrete slabs, forming a long section of flat driving surface. It has the advantages of strong load-bearing capacity, good integrity, long service life, and low maintenance. It is one of the main structural forms of long-life pavement.

[0003] Continuously reinforced concrete pavements are currently commonly constructed using the cast-in-place method. Because continuous longitudinal reinforcement is used and transverse contraction and expansion joints are absent, cast-in-place construction can produce numerous random transverse cracks due to thermal and drying shrinkage. However, the restraining effect of the longitudinal reinforcement minimizes crack width, ensuring load transfer and preventing rainwater intrusion that could rust the reinforcement and erode the base layer.

[0004] However, concrete cracks are generated freely, resulting in uneven crack shape, width, and spacing after concrete pouring due to thermal and drying shrinkage. When crack spacing is too small or crack width is too large, the probability of pavement damage increases significantly. Furthermore, the presence of numerous microcracks in the pavement results in a poor appearance of continuously reinforced concrete pavements. Asphalt overlays are commonly applied to the surface layer in China, significantly increasing road pavement investment.

[0005] Therefore, in order to improve the performance of continuously reinforced concrete pavements, reduce pavement diseases caused by irregular cracks, and improve the appearance quality of the pavement, a cast-in-place longitudinally continuous and seamless reinforced concrete pavement is urgently needed. Although invention patent CN202110921861.3 discloses a cast-in-place prestressed concrete pavement structure and its construction method, prestressing is applied to the transverse steel bars in the lane precast strip, mainly to avoid the generation of longitudinal cracks. However, the main cracks in continuously reinforced concrete pavements are transverse cracks. This invention cannot avoid the generation of transverse cracks and cannot meet the requirements of longitudinal continuous and seamless concrete pavements. Summary of the Invention

[0006] The present invention aims to provide a cast-in-place longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer and a construction method. The present invention can ensure that the pavement is longitudinally continuous and seamless at all locations, has no random transverse cracks, has a simple structure, is easy to construct, and has low cost.

[0007] The technical solution adopted in the present invention is:

[0008] A cast-in-place longitudinal continuous and seamless prestressed reinforced concrete pavement surface layer comprises a cast-in-place concrete slab, a longitudinal channel tube, longitudinal prestressed tendons, anchors and transverse post-cast strips; anchoring grooves are reserved transversely on the top surface of the cast-in-place concrete slab, and a plurality of anchoring grooves are distributed longitudinally; the longitudinal channel tubes are pre-buried in the cast-in-place concrete slab, and the two ends of a single longitudinal channel tube extend to anchoring grooves of different rows respectively, and the longitudinal channel tubes in the same row are arranged continuously longitudinally through the anchoring grooves, and the longitudinal channel tubes in adjacent rows are arranged crosswise with each other; the longitudinal prestressed tendons pass through the corresponding longitudinal channel tubes, and the ends of the longitudinal prestressed tendons are anchored in the anchoring grooves by anchors after tensioning; the anchoring grooves form transverse post-cast strips by post-casting concrete.

[0009] Preferably, both ends of a single longitudinal channel tube extend to different anchoring grooves respectively, and pass through an anchoring groove in the middle.

[0010] As another option, both ends of a single longitudinal channel tube extend to different anchoring grooves respectively, and pass through at least two anchoring grooves in the middle.

[0011] Preferably, the longitudinal channel tube is in an arc shape with a lower middle and higher sides and is symmetrical about the middle position.

[0012] Preferably, the side walls of the anchor groove are perpendicular to the ends of the longitudinal prestressed tendons extending therein.

[0013] Preferably, the shape and size of the anchoring groove are designed according to the anchor.

[0014] Preferably, the longitudinal channel tube is a corrugated tube.

[0015] The construction method of the above-mentioned cast-in-place longitudinal continuous seamless prestressed reinforced concrete pavement surface layer comprises the following steps:

[0016] S1. Place corresponding longitudinal channel tubes according to the position and distribution of longitudinal prestressed tendons, then cast in situ to obtain a cast-in-situ concrete slab. Then, construct anchor grooves on the top surface of the cast-in-situ concrete slab using a mold according to the distribution of anchor grooves, and then cure the cast-in-situ concrete slab.

[0017] S2. When the concrete reaches a certain strength, the longitudinal prestressed tendons are passed through the longitudinal channel tubes, and then the ends of the longitudinal prestressed tendons are tensioned and anchored in the anchor grooves through anchors;

[0018] S3. Grout the longitudinal channel pipe, pour concrete in the anchor groove to form a transverse post-casting strip, and then maintain the grouting and transverse post-casting strip.

[0019] Preferably, in step S2, the longitudinal prestressed tendons are passed through the longitudinal channel tube when the concrete reaches more than 75% of the design strength.

[0020] The beneficial effects of the present invention are:

[0021] Since the longitudinal prestressed tendons in the same row are arranged continuously longitudinally and the longitudinal prestressed tendons in adjacent rows are arranged crosswise with each other, the longitudinal prestressed tendons are prestressed at all longitudinal locations of the cast-in-place concrete slab, and the transverse post-casting strips are also continuous and seamless. This can ensure that all parts of the road surface, including the transverse post-casting strips, are longitudinally continuous and seamless, without random transverse cracks, completely avoiding the problems of road surface damage and poor quality caused by transverse cracks in continuous concrete pavements. In addition, the structure is simple, the construction is convenient, the cost is low, and it is easy to promote, with good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a top view of the cast-in-place longitudinal continuous and seamless prestressed reinforced concrete pavement surface layer in an embodiment of the present invention. For the convenience of observation, the longitudinal prestressed reinforcement, longitudinal channel tubes, and anchors are displayed.

[0023] Figure 2 It is a longitudinal side sectional view of a cast-in-place longitudinal continuous and seamless prestressed reinforced concrete pavement surface layer in an embodiment of the present invention.

[0024] In the figure: 1- cast-in-place concrete slab; 2- longitudinal prestressed tendons; 3- longitudinal duct pipe; 4- transverse post-cast strip; 5- anchorage. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0027] The features and performance of the present application are further described in detail below with reference to the embodiments.

[0028] This embodiment discloses a cast-in-place longitudinal continuous seamless prestressed reinforced concrete pavement surface layer, such as Figure 1 and Figure 2As shown, it includes a cast-in-place concrete slab 1, a longitudinal channel tube 3, a longitudinal prestressed tendon 2, an anchor 5 and a transverse post-cast strip 4; an anchor groove is reserved transversely on the top surface of the cast-in-place concrete slab 1, and several anchor grooves are distributed longitudinally; the longitudinal channel tube 3 is pre-buried in the cast-in-place concrete slab 1, and the two ends of a single longitudinal channel tube 3 extend to anchor grooves of different rows respectively, and the longitudinal channel tubes 3 in the same row are continuously arranged longitudinally through the anchor grooves, and the longitudinal channel tubes 3 in adjacent rows are arranged crosswise with each other; the longitudinal prestressed tendon 2 passes through the corresponding longitudinal channel tube 3, and the end of the longitudinal prestressed tendon 2 is anchored in the anchor groove by the anchor 5 after tensioning; the anchor groove forms a transverse post-cast strip 4 by post-cast concrete.

[0029] In the above scheme: since the longitudinal prestressed tendons 2 of the same row are arranged continuously longitudinally, and the longitudinal prestressed tendons 2 of adjacent rows are arranged crosswise with each other, the longitudinal prestressed tendons 2 apply prestressing in all longitudinal locations of the cast-in-place concrete slab 1, and the transverse post-casting strips 4 are also continuous and seamless, which can ensure that all parts of the road surface including the transverse post-casting strips 4 are longitudinally continuous and seamless, without random transverse cracks, and completely avoid the problems of road surface damage and poor quality caused by transverse cracks in the continuous concrete pavement. In addition, the structure is simple, the construction is convenient, the cost is low, and it is easy to promote, with good economic benefits.

[0030] like Figure 1 and Figure 2 As shown, in this embodiment, the ends of a single longitudinal channel tube 3 extend to different anchor grooves, passing through only one anchor groove in between. This arrangement is a preferred embodiment because the crossing effect of adjacent rows of longitudinal channel tubes 3 is better and the arrangement is more convenient. Of course, the following scheme is also possible: the ends of a single longitudinal channel tube 3 extend to different anchor grooves, passing through at least two anchor grooves in between; this arrangement can also ensure the longitudinal continuity of the road surface and the absence of random transverse cracks in the surface layer, but it is more inconvenient to arrange.

[0031] like Figure 2 As shown, in this embodiment, the longitudinal channel tube 3 is in an arc shape with a low middle and high sides and is symmetrical about the middle position. This arrangement provides a better prestressing effect. Figure 2 As shown, in this embodiment, the side wall of the anchor groove is perpendicular to the end of the longitudinal prestressed tendon 2 extending therein, and this arrangement provides a better prestressing effect.

[0032] Preferably, the shape and size of the anchoring groove are designed according to the anchor 5. Preferably, the longitudinal channel pipe 3 is a corrugated pipe, which is convenient for construction and installation and has a good channel quality.

[0033] The construction method of the above-mentioned cast-in-place longitudinal continuous seamless prestressed reinforced concrete pavement surface layer comprises the following steps:

[0034] S1. Place corresponding longitudinal channel tubes 3 according to the position and distribution of the longitudinal prestressed tendons 2, then cast in situ to obtain a cast-in-situ concrete slab 1. Then, construct anchor grooves on the top surface of the cast-in-situ concrete slab 1 using a mold according to the distribution of anchor grooves, and then cure the cast-in-situ concrete slab 1.

[0035] S2. When the concrete reaches a certain strength, the longitudinal prestressed tendons 2 are passed through the longitudinal channel tube 3, and then the ends of the longitudinal prestressed tendons 2 are tensioned and anchored in the anchor groove through the anchor 5;

[0036] S3. Grouting the longitudinal channel pipe 3, pouring concrete in the anchor groove to form a transverse post-casting strip 4, and then curing the grouting and the transverse post-casting strip 4.

[0037] In step S2, when the concrete reaches more than 75% of the design strength, the longitudinal prestressed tendons 2 are passed through the longitudinal channel tube 3. The solution given here is a better one, and the specific timing during construction is determined according to actual needs.

[0038] The embodiments described above are part of the embodiments of the present application, rather than all of the embodiments. The detailed description of the embodiments of the present application is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

Claims

1. A cast-in-place longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer, characterized by: It includes cast-in-place concrete slab, longitudinal channel pipe, longitudinal prestressed tendons, anchors and transverse post-cast strips; anchor grooves are reserved transversely on the top surface of the cast-in-place concrete slab, and several anchor grooves are distributed longitudinally; the longitudinal channel pipes are embedded in the cast-in-place concrete slab, and the two ends of a single longitudinal channel pipe extend to anchor grooves of different rows respectively. The longitudinal channel pipes in the same row are continuously arranged longitudinally through the anchor grooves, and the longitudinal channel pipes in adjacent rows are arranged crosswise with each other; the longitudinal prestressed tendons pass through the corresponding longitudinal channel pipes, and the ends of the longitudinal prestressed tendons are anchored in the anchor grooves through anchors after tensioning; the anchor grooves form transverse post-cast strips through post-cast concrete.

2. The cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 1, characterized in that: Both ends of a single longitudinal channel tube extend to different anchor grooves respectively, and pass through an anchor groove in the middle.

3. The cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 1, characterized in that: Both ends of a single longitudinal channel tube extend to different anchoring grooves respectively, and the middle passes through at least two anchoring grooves.

4. The cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 1, characterized in that: The longitudinal channel tube is in an arc shape with a low middle and high sides and is symmetrical about the middle position.

5. The cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 1, characterized in that: The side walls of the anchor groove are perpendicular to the ends of the longitudinal prestressed tendons extending therein.

6. The cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 1, characterized in that: The shape and size of the anchor groove are designed according to the anchor.

7. The cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 1, characterized in that: The longitudinal channel pipe adopts a corrugated pipe.

8. The construction method of a cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to any one of claims 1 to 7, characterized in that: Including steps: S1. Place corresponding longitudinal channel tubes according to the position and distribution of longitudinal prestressed tendons, then cast in situ to obtain a cast-in-situ concrete slab. Then, construct anchor grooves on the top surface of the cast-in-situ concrete slab using a mold according to the distribution of anchor grooves, and then cure the cast-in-situ concrete slab. S2. When the concrete reaches a certain strength, the longitudinal prestressed tendons are passed through the longitudinal channel tubes, and then the ends of the longitudinal prestressed tendons are tensioned and anchored in the anchor grooves through anchors; S3. Grout the longitudinal channel pipe, pour concrete in the anchor groove to form a transverse post-casting strip, and then maintain the grouting and transverse post-casting strip.

9. The construction method of a cast-in-situ longitudinally continuous and seamless prestressed reinforced concrete pavement surface layer according to claim 8, characterized in that: In step S2, when the concrete reaches more than 75% of the design strength, the longitudinal prestressed tendons are passed through the longitudinal channel tube.

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