CN110205893B

CN110205893B - Anti-bending precast concrete pavement structure with steel fibers laid on upper layer and lower layer

Info

Publication number: CN110205893B
Application number: CN201910387762.4A
Authority: CN
Inventors: 伍凯; 施楠; 徐佳楠; 李辉; 刘晓艺
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2021-08-10
Anticipated expiration: 2039-05-10
Also published as: CN110205893A

Abstract

The invention discloses an anti-bending precast concrete pavement structure with steel fibers laid on an upper layer and a lower layer, which comprises a common steel fiber laying layer, a precast concrete matrix, a latticed steel fiber laying layer and a steel plate with ribs on the bottom surface; the common steel fiber laying layer and the latticed steel fiber laying layer are laid in the precast concrete matrix; the bottom ribbed steel plate is fixed at the bottom of the precast concrete matrix. The anti-bending precast concrete pavement structure with the upper layer and the lower layer paved with the steel fibers organically combines the steel fiber concrete matrix and the steel plate with the rib on the bottom surface to form the precast steel fiber concrete pavement structure with high toughness and strong anti-bending property.

Description

Anti-bending precast concrete pavement structure with steel fibers laid on upper layer and lower layer

Technical Field

The invention relates to a steel fiber concrete pavement structure, in particular to an anti-bending precast concrete pavement structure with steel fibers laid on the upper layer and the lower layer.

Background

The cement concrete pavement is developed by the advantages of high strength, high rigidity, good durability and the like, but the defects are obvious. In order to adapt to increasing traffic volume, the thickness of the cement concrete pavement is increased continuously so as to improve the tensile and anti-breaking performance of the bottom of the concrete pavement slab. Therefore, the amount of cement and water used increases, and the pollution caused by cement production increases.

For this reason, many scholars and experts have long sought ways to improve the tensile properties of concrete, and steel fiber concrete has been proposed. Compared with common cement concrete, the steel fiber concrete has higher compression strength, tensile strength, bending strength and excellent impact resistance and fatigue resistance. However, when a traditional steel fiber concrete pavement is constructed, the steel fibers are messy and short, and the defect that the steel fibers are easy to agglomerate when concrete is stirred exists, and on the other hand, the steel fibers have high density, and can sink into the bottom when being poured, and cannot be uniformly distributed in the concrete, so that the performance of the concrete is reduced, the pavement quality is influenced, and the application and popularization of the steel fiber concrete pavement are limited.

Disclosure of Invention

The purpose of the invention is as follows: the anti-bending precast concrete pavement structure with the steel fibers laid on the upper layer and the lower layer disclosed by the invention forms a novel concrete pavement structure by changing the doping mode of the steel fibers in the concrete and matching with a reinforcement measure at the bottom of the concrete, and the steel fiber concrete matrix and the bottom ribbed steel plate are organically combined to form the high-toughness and strong anti-bending precast steel fiber concrete pavement structure.

The technical scheme is as follows: a structure of an anti-bending precast concrete pavement with steel fibers laid on an upper layer and a lower layer comprises a common steel fiber laying layer, a precast concrete matrix, a latticed steel fiber laying layer and a steel plate with ribs on the bottom surface; the common steel fiber laying layer and the latticed steel fiber laying layer are laid in the precast concrete matrix; and the bottom ribbed steel plate is fixed at the bottom of the precast concrete matrix.

Specifically, the common steel fiber laying layer is 20-30mm away from the upper plane of the precast concrete matrix, the laying thickness of the latticed steel fiber laying layer is 2-5mm, the latticed steel fiber laying layer is arranged in the precast concrete matrix in a parabolic shape, two ends of the latticed steel fiber laying layer are bent from the middle point of the thickness of the precast concrete matrix, and the lowest point is 10-15mm away from the lower plane of the precast concrete matrix. The thickness of the ordinary steel fiber laying layer is 5-8 mm.

Specifically, the thickness of the precast concrete matrix is 100-150mm, the length is 10-15m, and the width is 3-4 m.

Specifically, the steel fiber grids of the latticed steel fiber laying layer are square, and the side length of each grid is 5-10 mm.

Specifically, the bottom surface ribbed steel plate is connected with the precast concrete matrix through the rib, and the rib height is 40mm, and wide 10mm, equidistant 1000mm sets up. The length of the prefabricated concrete base body is the same as that of the prefabricated concrete base body, and the prefabricated concrete base body is distributed on the bottom edge side and the middle of the prefabricated concrete base body at equal intervals. The bottom ribbed steel plate is laid along the length direction of the precast concrete matrix.

Specifically, the steel fibers in the ordinary steel fiber laying layer are formed by mixing straight steel fibers, pressed prismatic steel fibers, corrugated steel fibers, hook-shaped steel fibers, large-head-shaped steel fibers, double-tip-shaped steel fibers, bundling steel fibers and the like. The specific use number of the channel steel plates depends on the width of the road surface and the traffic load grade.

The latticed steel fiber laying layer directly solves the problems that the steel fibers are easy to agglomerate and are not uniformly distributed, and the using amount of the steel fibers is reduced. Moreover, the bottom of the concrete pavement slab is pulled when bearing traffic load, and the crack resistance of the concrete bottom is greatly improved by laying the latticed steel fibers.

Has the advantages that: the anti-bending precast concrete pavement structure with the steel fibers laid on the upper layer and the lower layer disclosed by the invention has the advantages that:

(1) compared with the common steel fiber concrete pavement, the pavement slab has the advantages that the toughness of the pavement slab is improved due to the reinforcement of the bottom steel plate, the thickness of the pavement slab is reduced, and materials are saved;

(2) the positioning arrangement of the steel fiber laying layer directly solves the problems of steel fiber agglomeration, uneven distribution and the like in concrete, improves the doping amount of the steel fiber, and avoids the structural defects of the concrete; the upper layer steel fiber is used for controlling crack development, and the lower layer steel fiber is used for improving the bending resistance of the pavement slab;

(3) the arrangement of the steel fiber grids enables the longitudinal steel fibers to bear tensile force, and the transverse steel fibers play a role in fixing and bearing partial shearing force. Compared with the traditional disorderly-direction short-cut steel fiber distribution, the performance of the steel fiber material is fully exerted, and a large amount of waste of the steel fiber is avoided;

(4) the parabolic arrangement of the steel fiber grids perfectly fits the stress path of the road slab;

(5) the invention is a pavement structure formed by combining steel fiber concrete and a steel structure, and has good integrity and higher fracture resistance, crack resistance, impact resistance and seismic resistance.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic longitudinal section of the present invention.

Detailed Description

A structure of an anti-bending precast concrete pavement with steel fibers laid on an upper layer and a lower layer comprises a common steel fiber laying layer 1, a precast concrete matrix 2, a latticed steel fiber laying layer 3 and a steel plate 4 with ribs on the bottom surface; the common steel fiber laying layer 1 and the latticed steel fiber laying layer 3 are laid in the precast concrete matrix 2; the bottom ribbed steel plate 4 is fixed at the bottom of the precast concrete matrix 2.

The common steel fiber laying layer 1 is 20-30mm away from the upper plane of the precast concrete matrix 2, the laying thickness of the latticed steel fiber laying layer is 2-5mm, the common steel fiber laying layer and the latticed steel fiber laying layer are arranged in the precast concrete matrix 2 in a parabolic shape, two ends of the common steel fiber laying layer are bent from the middle point of the thickness of the precast concrete matrix 2, and the lowest point is 10-15mm away from the lower plane of the precast concrete matrix. The thickness of the ordinary steel fiber laying layer 1 is 5-8 mm. The thickness of the latticed steel fiber laying layer 3 is 2-5mm, the steel fiber grids are square, and the side length of each grid is 5-10 mm.

The thickness of the precast concrete matrix 2 is 100-150mm, the length is 10-15m, and the width is 3-4 m.

The steel plate 4 with the ribs on the bottom is connected with the precast concrete base body through the ribs 5, the height of the ribs is 40mm, the width of the ribs is 10mm, and the equal distance is 1000 mm. The bottom ribbed steel plate 4 can also be connected with the precast concrete base body 2 by adopting high-strength bolts.

The bottom ribbed steel plate 4 is 40-60mm thick, 400-500mm wide, the length is the same as the length of the precast concrete matrix 2, and the bottom ribbed steel plate is positioned at the side and the middle of the bottom of the precast concrete matrix 2.

Claims

1. The utility model provides an upper and lower floor lays steel fibre's anti precast concrete pavement structure that rolls over which characterized in that: comprises a common steel fiber laying layer (1), a precast concrete matrix (2), a latticed steel fiber laying layer (3) and a steel plate (4) with a rib on the bottom surface; the common steel fiber laying layer (1) and the latticed steel fiber laying layer (3) are laid in the precast concrete matrix (2); the bottom ribbed steel plate (4) is fixed at the bottom of the precast concrete matrix (2); the distance between the common steel fiber laying layer (1) and the upper plane of the precast concrete matrix (2) is 20-30 mm; the thickness of the common steel fiber laying layer (1) is 5-8 mm; the thickness of the latticed steel fiber laying layer (3) is 2-5mm, the latticed steel fiber laying layer is arranged in the precast concrete matrix (2) in a parabolic shape, two ends of the latticed steel fiber laying layer are bent from the middle point of the thickness of the precast concrete matrix (2), and the lowest point is 10-15mm away from the lower plane of the precast concrete matrix (2); the thickness of the precast concrete matrix (2) is 100-150mm, the length is 10-15m, and the width is 3-4 m; the steel fiber grids of the latticed steel fiber laying layer (3) are square, and the side length of each grid is 5-10 mm; the bottom ribbed steel plate (4) is connected with the precast concrete matrix (2) through ribs (5), and the ribs (5) are 40mm in height, 10mm in width and 1000mm in equal interval; the bottom ribbed steel plate (4) is 40-60mm thick, 400-500mm wide, the length of the bottom ribbed steel plate is the same as that of the precast concrete matrix (2), and the bottom ribbed steel plate is positioned on the side and the middle of the bottom of the precast concrete matrix (2).