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An empty stomach type box-rock anchor combined light ground anchor abutment and its construction technology

A ground-anchored abutment and open-belt technology, applied in bridges, bridge construction, bridge parts, etc., can solve the problems of difficult cracking control, excessive excavation, poor durability, etc., to improve the effective prestress and fatigue resistance. Low relaxation, strong anti-pulling effect

Active Publication Date: 2021-11-23
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is the difficulty of ground anchor cracking control and poor stability and durability. In order to solve this problem, the present invention provides a fasting box-rock anchor combined light ground anchor abutment and its construction technology. Organically combine the fasting box-shaped ground anchor with the rock anchor, and use the rock anchor that can be deeply embedded in the rock formation to effectively improve the anti-lifting, anti-sliding and anti-overturning capabilities of the shallow-buried hollow box-shaped ground anchor, and also overcome the traditional gravity abutment There are disadvantages such as excessive anchor body volume and mountain excavation, difficult crack control, poor durability, and high cost; at the same time, fiber-reinforced plastic tendons are used as prestressed tendons of fasting box-shaped ground anchors and anchor rods of rock anchors. Performance The cement-based material is used as the grouting material for the prestressed hole of the fasting box-shaped ground anchor and the bonding medium for the rock bolt bolt, which overcomes the structural durability problems of the traditional rock anchor due to the corrosion of the steel bar and the aging of the grouting body.

Method used

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  • An empty stomach type box-rock anchor combined light ground anchor abutment and its construction technology
  • An empty stomach type box-rock anchor combined light ground anchor abutment and its construction technology
  • An empty stomach type box-rock anchor combined light ground anchor abutment and its construction technology

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specific Embodiment 1

[0043] Specific embodiment 1, a kind of fasting type box-rock anchor combined type light ground anchor abutment construction technology, comprises the following steps:

[0044] ① Determine the loads to be borne by the fasting box ground anchor 1 and the rock anchor 2 respectively;

[0045] ②Determine the raw material and proportion of ordinary concrete, and use it as the material of the fasting box-shaped ground anchor 1;

[0046] Determine the raw materials and proportions of ultra-high performance cement-based composite materials, and use them as grouting materials for vertical prestressed holes and transverse prestressed holes;

[0047] Determine the materials of the vertical prestressing tendons 3 and the transverse prestressing tendons 4;

[0048] Determine the raw materials and ratio of ultra-high-performance cement-based composite materials, and use them as anchoring and bonding media;

[0049] Determine the size of the fasting box ground anchor 1, and determine the n...

specific Embodiment 2

[0061] Specific embodiment 2, a kind of fasting type box-rock anchor combination type light ground anchor abutment construction technology, comprises the following steps:

[0062] (1) Determine the loads to be borne by the fasting box ground anchor 1 and the rock anchor 2 respectively;

[0063] (2) Determine the material of the fasting box ground anchor 1, the prestressed tendon material and the grouting material for the installation hole: determine the raw material and proportion of ordinary concrete, and use it as the material of the fasting box ground anchor 1; determine the fiber reinforced composite material The specific type of tendons is used as vertical prestressed tendons 3 and transverse prestressed tendons 4; the raw materials and ratio of ultra-high performance cement-based composite materials are determined, and they are used as grouting for vertical prestressed holes and transverse prestressed holes material;

[0064] (3) Determine the bolt material and anchorin...

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Abstract

The invention relates to the field of bridge structures, in particular to a fasting box-rock anchor combined light-duty ground anchor abutment and its construction technology, which includes fasting box-shaped ground anchors, rock anchors and the connection between them , Several vertical prestressed holes and several anchor holes are preset in the fasting box-shaped ground anchor, and the anchor holes are deeply embedded in the rock formation below the box-shaped abutment. A fiber-reinforced composite anchor rod is arranged in the anchor hole, and a fiber-reinforced composite material bar is arranged in both the vertical prestressed hole and the transverse prestressed hole. The combined ground anchor abutment system of the present invention organically combines the fasting box-shaped ground anchor with the rock anchor, and utilizes the rock anchor that can be deeply embedded in the rock layer to effectively improve the pull-out resistance, anti-sliding and anti-overturning capabilities of the shallow-buried fasting box-shaped ground anchor , It also overcomes the shortcomings of the traditional gravity abutment, such as excessive anchor body volume and mountain excavation volume, difficult crack control, poor durability, and high cost.

Description

technical field [0001] The invention relates to the field of bridge structures, in particular to a fasting box-rock anchor combined light ground anchor abutment and a construction process thereof. Background technique [0002] The ground-anchored abutment is the key stress-bearing component of the long-span anchored cable-stayed bridge, which must safely bear the huge uplift force and horizontal force transmitted by the ground-anchored cable-stayed cables. At present, the commonly used ground anchor structures can be divided into solid gravity anchors, box-shaped fasting box anchors and rock anchors. [0003] The solid gravity anchor uses the self-weight of the masonry volume of the anchor body to balance the huge pulling force transmitted by the cable. It has a wide range of applications in traditional cable-bearing bridges, but there are problems such as excessive masonry volume, difficult crack control, and high cost. Disadvantages: The fasting box-shaped ground anchor i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/02E01D21/00
CPCE01D19/02E01D21/00
Inventor 方志裴炳志蒋正文谭星宇
Owner HUNAN UNIV