Cement concrete surface layer structure
By using welding connections of longitudinal strip steel plates, transverse steel bars and bolts in the cement concrete surface layer, the problem of decreasing bonding force and slippage of continuous reinforced cement concrete pavement is solved, which significantly improves the tensile strength and durability, and prevents Corrosion of transverse cracks.
Patent Information
- Application Number
- CN202421461988.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-06-25
AI Technical Summary
In heavy traffic sections of highways, the continuous reinforced concrete pavement decreases due to the decrease in the bonding force between concrete and steel bars, resulting in slippage and transverse cracks, which makes the steel bars easily corroded and shortens the life of the road surface.
The cement concrete surface layer structure is adopted, including longitudinal strip steel plates, transverse steel bars, upper bolts and lower bolts. The cement concrete surface layer is fixedly connected by welding, which increases the adhesion and tensile strength to avoid transverse cracks. Generate or control its width within the design value.
It effectively improves the lateral bonding force and anti-slip capacity of the cement concrete surface layer, extends the durability of the road surface, prevents passenger water from corroding the steel bars, and significantly improves the durability of the road surface.
Smart Images
Figure CN222205902U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a cement concrete surface layer structure, and more specifically, to a cement concrete surface layer structure applied to a continuously reinforced cement concrete pavement. Background Art
[0002] On highways with heavy traffic, continuously reinforced cement concrete pavements are often used. With the increase in traffic volume and the repeated action of vehicle loads, the bonding force between concrete and steel bars gradually decreases, and slippage occurs between concrete and steel bars, causing the spacing of transverse cracks on continuously reinforced cement concrete pavements to exceed the design value. When the width of transverse cracks on continuously reinforced cement concrete pavements exceeds the design value, guest water (including rainwater, ice and snow meltwater, and road sprinklers) can easily penetrate through the transverse cracks and corrode the steel bars at the cracks, resulting in a decrease in the life of the pavement. Summary of the invention
[0003] In order to overcome the disadvantages of the above technical problems, the utility model provides a cement concrete surface layer structure.
[0004] The cement concrete surface layer structure of the utility model comprises transverse steel bars and concrete, wherein the transverse steel bars are evenly arranged in the longitudinal direction of the cement concrete surface layer; the characteristic is that longitudinal strip steel plates are evenly arranged in the transverse direction of the cement concrete surface layer, and the strip steel plates are fixedly connected to the transverse steel bars; vertical upper bolts are fixed on the upper surface of the strip steel plates, and vertical lower bolts are fixed on the lower surface of the strip steel plates, and concrete is poured on the periphery of the strip steel plates, the transverse steel bars, the upper bolts and the lower bolts; the strip steel plates, the transverse steel bars, the upper bolts, the lower bolts and the concrete together constitute the cement concrete surface layer.
[0005] In the cement concrete surface layer structure of the utility model, the strip steel plate and the transverse steel bar are perpendicular to each other and fixed by welding, and the upper bolts and the lower bolts are fixed to the strip steel plate by welding.
[0006] The cement concrete surface layer structure of the utility model has a thickness range of 24 cm to 30 cm, and the grade of the concrete is 30 MPa to 40 MPa.
[0007] The utility model discloses a cement concrete surface layer structure, wherein the strip steel plates have a thickness of 8 mm to 12 mm, a width of 8 cm to 12 cm, and a length of 7 m to 9 m, and adjacent strip steel plates along the longitudinal direction of the cement concrete surface layer are connected by welding; and the longitudinal reinforcement ratio of the cement concrete surface layer is 0.7% to 0.9%.
[0008] The cement concrete surface layer structure of the utility model has a diameter of 16 mm to 20 mm and a length of 8 cm to 10 cm. Two upper studs and two lower studs are fixed on a strip steel plate on the same transverse section, and the distance between two adjacent upper studs and two adjacent lower studs in the longitudinal direction is 15 cm to 40 cm.
[0009] In the cement concrete surface layer structure of the utility model, the interval between two adjacent transverse steel bars in the longitudinal direction is 50 cm to 70 cm, and the transverse steel bars are secondary steel bars with a diameter of 14 mm to 18 mm.
[0010] The beneficial effects of the utility model are as follows: the cement concrete surface layer structure of the utility model is composed of strip steel plates, transverse steel bars, upper bolts, lower bolts and concrete. The transverse steel bars are evenly arranged in the longitudinal direction, and the longitudinal strip steel plates are evenly arranged in the transverse direction. The upper bolts and the lower bolts are evenly fixed on the upper and lower surfaces of the strip steel plates. In this way, after pouring the concrete and curing, under the joint action of the strip steel plates and the upper bolts and the lower bolts, the bonding force and the tensile strength in the transverse direction of the formed cement concrete surface layer can be effectively increased. The setting of the bolts increases the anti-slip ability between the strip steel plates and the concrete. Under long-term repeated loads, transverse cracks in the cement concrete surface layer can be effectively avoided. Even if transverse cracks occur, the width of the transverse cracks can be controlled within the design value (such as 0.5mm), thereby avoiding the corrosion of the cracked steel bars by guest water, thereby having a longer durability than the cement concrete pavement with continuous reinforcement. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a transverse cross-sectional view of the cement concrete surface layer structure of the utility model;
[0012] Figure 2 It is a top view of the cement concrete surface layer structure of the utility model.
[0013] In the figure: 1 cement concrete surface layer, 2 strip steel plates, 3 transverse steel bars, 4 upper studs, 5 lower studs, 6 concrete, 7 road surface base. DETAILED DESCRIPTION
[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0015] like Figure 1 and Figure 2As shown, the transverse cross-sectional view and the top view of the cement concrete surface layer structure of the utility model are respectively given. The cement concrete surface layer 1 shown is arranged on the road base 7, which is composed of a strip steel plate 2, a transverse steel bar 3, an upper stud 4, a lower stud 5 and concrete 6. The length directions of the strip steel plate 2 and the transverse steel bar 3 are respectively consistent with the longitudinal and transverse directions of the cement concrete surface layer 1. The strip steel plate 2 and the transverse steel bar 3 are evenly arranged along the transverse and longitudinal directions of the cement concrete surface layer 1. The transverse steel bar 3 is perpendicular to the strip steel plate 2 and fixedly connected by welding. The upper stud 4 is vertically fixed on the upper surface of the strip steel plate 2, and the lower stud 5 is vertically fixed on the lower surface of the strip steel plate 2. The upper stud 4, the lower stud 5 and the strip steel plate 2 are usually fixed by welding. Concrete 6 is poured on the periphery of the strip steel plate 2, the transverse steel bar 3, the upper stud 4 and the lower stud 5, and the cement concrete surface layer 1 is formed after curing.
[0016] It can be seen that in the cement concrete surface layer 1 of the utility model, the strip steel plate 2 is used to replace the longitudinal reinforcement. Under the joint action of the strip steel plate 2 and the upper bolts 4 and the lower bolts 5, the bonding force and anti-skid ability of the concrete 6 and the strip steel plate 2 and the upper bolts 4 and the lower bolts 5 can be effectively increased, and the tensile strength of the formed cement concrete surface layer 1 in the longitudinal direction can be increased. During service, under long-term repeated loads, the cement concrete surface layer 1 can be effectively prevented from generating transverse cracks. Even if transverse cracks are generated, the width of the transverse cracks can be controlled within the design value (such as 0.5mm). Since fewer transverse cracks are generated and the width of the transverse cracks is within the design value, it is prevented that guest water (including rainwater, ice and snow melt water and road sprinkler) intrudes through the transverse cracks and corrodes the steel plates or steel bars at the cracks. Compared with the cement concrete pavement with continuous reinforcement, its durability is longer.
[0017] In the cross section of the same cement concrete surface layer 1, the number of upper studs 4 and lower studs 5 fixed on a strip steel plate 2 is two, and the distance between two adjacent upper studs 4 and two adjacent lower studs 5 in the longitudinal direction (i.e., the length direction of the strip steel plate 2) is 15cm~40cm. Usually, the diameter of the upper studs 4 and the lower studs 5 is 16mm~20mm, and the length is 8cm~10cm.
[0018] Adjacent strip steel plates are connected by welding along the longitudinal direction (i.e., length direction) of the cement concrete surface layer 1, and the longitudinal reinforcement ratio of the cement concrete surface layer 1 is 0.7%~0.9%. The strip steel plate 2 has a thickness of 8mm~12mm, a width of 8cm~12cm, and a length of 7m~9m.
[0019] The thickness of the cement concrete surface layer 1 shown is in the range of 24 cm to 30 cm, and the grade of the concrete 6 is 30 MPa to 40 MPa. The spacing between two adjacent transverse steel bars 3 in the longitudinal direction is 50 cm to 70 cm, and the transverse steel bars 3 are secondary steel bars with a diameter of 14 mm to 18 mm.
[0020] The construction steps of the cement concrete surface layer structure of the present invention are as follows: the upper studs 4 and the lower studs 5 are welded to the strip steel plates 2 according to the design requirements before leaving the factory; when the cement concrete surface layer 1 is constructed on site, the strip steel plates 2 are first supported by steel bar brackets, and the strip steel plates 2 are erected, and the adjacent strip steel plates 2 in the longitudinal direction are fixedly connected by welding; then, according to the design requirements, the transverse steel bars 3 are welded to the strip steel plates 2, and after the erection is completed, concrete 6 is poured, and after the pouring is completed, curing is performed to form the cement concrete surface layer structure of the present invention.
Claims
1. A cement concrete surface layer structure, comprising transverse steel bars (3) and concrete (6), wherein the transverse steel bars are evenly arranged in the longitudinal direction of the cement concrete surface layer (1); characterized in that: A cement concrete surface layer is provided with longitudinal strip steel plates (2) evenly distributed along its transverse direction, and the strip steel plates are fixedly connected to transverse steel bars; vertical upper bolts (4) are fixed on the upper surface of the strip steel plates, and vertical lower bolts (5) are fixed on the lower surface of the strip steel plates; concrete is poured around the strip steel plates, transverse steel bars, upper bolts, and lower bolts; the strip steel plates, transverse steel bars, upper bolts, lower bolts, and concrete together constitute a cement concrete surface layer (1).
2. The cement concrete surface layer structure according to claim 1, characterized in that: The strip steel plate (2) and the transverse steel bar (3) are perpendicular to each other and are fixed to each other by welding, and the upper bolt (4) and the lower bolt (5) are fixed to the strip steel plate (2) by welding.
3. The cement concrete surface layer structure according to claim 1 or 2, characterized in that: The thickness of the cement concrete surface layer (1) ranges from 24 cm to 30 cm, and the grade of the concrete (6) ranges from 30 MPa to 40 MPa.
4. The cement concrete surface layer structure according to claim 1 or 2, characterized in that: The strip steel plates (2) have a thickness of 8 mm to 12 mm, a width of 8 cm to 12 cm, and a length of 7 m to 9 m. Adjacent strip steel plates along the longitudinal direction of the cement concrete surface layer (1) are connected by welding; the longitudinal reinforcement ratio of the cement concrete surface layer is 0.7% to 0.9%.
5. The cement concrete surface layer structure according to claim 1 or 2, characterized in that: The diameter of the upper bolt (4) and the lower bolt (5) is 16 mm to 20 mm, and the length is 8 cm to 10 cm; two upper bolts (4) and two lower bolts (5) are fixed to a strip steel plate (2) on the same transverse cross section, and the distance between two adjacent upper bolts and two adjacent lower bolts in the longitudinal direction is 15 cm to 40 cm.
6. The cement concrete surface layer structure according to claim 1 or 2, characterized in that: The spacing between two adjacent transverse steel bars (3) in the longitudinal direction is 50 cm to 70 cm, and the transverse steel bars are secondary steel bars with a diameter of 14 mm to 18 mm.