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Fiber grid reinforced hybrid fiber high strength and high ductility cement-based composite inspection well cover and its preparation

A fiber mesh and composite material technology, used in hydraulic engineering, underwater structures, infrastructure engineering and other directions, can solve the problems of easy theft, easy breakage, high brittleness, etc. high effect

Active Publication Date: 2022-03-08
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the past, cast iron manhole covers had serious problems such as easy theft, high brittleness and easy damage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Carbon fiber mesh reinforced high strength, high ductility fiber concrete manhole covers. The hole distance of the bidirectional carbon fiber mesh is 8mm, the width of the fiber bundle is 4.6mm, and the tensile force that the mesh can bear is 300kN / m. 3 layers of carbon fiber mesh, 3mm concrete protection layer, outermost diameter of the round manhole cover 920mm, edge support length of the manhole cover 90mm. The thickness of the outer edge of the manhole cover is 50mm, and the thickness of the inner center is 100mm, that is, the thickness of the manhole cover increases linearly from the outside to the inner center; there are 6 dispersed ribs, the ribs are rectangular cross-sections, and the cross-section increases linearly from the outside to the inside, and the outermost cross-section size is 40 *40mm, the section size at the innermost center is 60*60mm. 1 circular rib, cross-sectional size 45*45mm, rib center is 380mm away from plate center. The cement is selected...

example 2

[0034]Alkali-resistant glass fiber mesh reinforced high-strength, high-ductility fiber cement-based composite manhole covers. The hole distance of the two-way alkali-resistant glass fiber grid is 6mm, the width of the fiber bundle is 5mm, and the tensile force that the grid can bear is 150kN / m. 4 layers of alkali-resistant glass fiber mesh, 3mm concrete protective layer, the outermost diameter of the round manhole cover is 920mm, and the edge support length of the manhole cover is 90mm. The thickness of the outer edge of the manhole cover is 55mm, and the thickness of the inner center is 110mm. The thickness of the manhole cover increases linearly from the outside to the inner center; there are 6 dispersed ribs. The size is 45*45mm, and the section size at the innermost center is 65*65mm. 1 circular rib, cross-sectional size 50*50mm, rib center is 380mm away from plate center. A carbon fiber tendon with a diameter of 14mm is arranged in each dispersive rib and circumferentia...

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PUM

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Abstract

The invention relates to a fiber grid reinforced hybrid fiber high-strength and high ductility cement-based composite material inspection well cover and its preparation, which belong to the technical field of fiber grid reinforced cement-based composite material product engineering application. The manhole cover adopts a composite structure of cement-based composite material and fiber grid, in which two-way carbon fiber, alkali-resistant glass fiber and other grids are used as the reinforcement material, and high-strength and high-ductility hybrid fiber cement-based composite material is used as the matrix. The fiber grid is arranged in multiple layers near the bottom of the manhole cover, and the protective layer is 2-4mm. The well cover has 6 distributed ribs in the radial direction, arranged at an equal angle; there is a ring of ribs in the circumferential direction, which is located at a distance of 400mm from the center of the well cover; each dispersed rib and the inner center of the circumferential rib are equipped with a diameter of 12-16mm Carbon fiber ribs. After the manhole cover is finished, it is cured in 85-degree steam for 55-80 hours. The anti-vehicle fatigue load and impact load of the manhole cover are 341% and 284% higher than those of the cast iron manhole cover respectively.

Description

technical field [0001] The invention relates to a preparation method and material for a fiber grid reinforced concrete power tunnel inspection well cover, and belongs to the technical field of fiber grid reinforced cement-based composite material product engineering application. [0002] technical background [0003] In recent years, with the rapid development of urbanization and urban agglomeration in my country, the number of power tunnels is increasing. Underground pipelines such as power tunnels are aging or severely damaged due to long-term use, jeopardizing the normal use of pipelines and power supply. Regular inspection and repair of pipelines is becoming increasingly important. As an important component of underground pipelines, inspection wells have been affected by multiple unfavorable factors such as road traffic load, water seepage and theft for a long time, and serious problems such as damage and loss have occurred. Once the inspection well is damaged, it will s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04E02D29/14
CPCC04B28/04E02D29/14C04B2201/50C04B18/146C04B18/08C04B18/12C04B14/386C04B16/0641C04B14/44C04B14/46C04B16/0625C04B14/48C04B14/06C04B2103/302C04B14/026
Inventor 邓宗才
Owner BEIJING UNIV OF TECH