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Suspension conduit bridge tunnel type anchorage main cable anchoring system

An anchoring system and tunnel-type technology, used in bridges, bridge materials, bridge construction, etc., can solve problems such as good integrity, failure to meet design requirements, and few rock mass joints, reducing excavation size, reducing disturbance, The effect of improving the safety factor

Pending Publication Date: 2019-06-18
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tunnel anchors require fewer rock mass joints and good integrity. In some rock masses with poor geological conditions, low surrounding rock strength, and developed structural cracks, the current conventional tunnel anchoring method for anchoring the main cable cannot meet the design requirements.

Method used

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  • Suspension conduit bridge tunnel type anchorage main cable anchoring system
  • Suspension conduit bridge tunnel type anchorage main cable anchoring system
  • Suspension conduit bridge tunnel type anchorage main cable anchoring system

Examples

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Embodiment

[0044] The invention is applied to a suspension pipeline bridge with a main span length of 355m and a main cable rise-span ratio of 1 / 10 to transport a gas pipeline with a diameter of Ф1016mm and a water pipeline with a diameter of D150mm. The suspension pipeline bridge includes 2 sets of main cables, each with a spacing of 3m; each set of main cables is composed of 2 PES5×265 twin-screw main cables, and the spacing between each main cable is 550mm. The main cable on the east bank of the pipeline bridge adopts a gravity-type anchorage pier, and the anchoring position of the main cable on the west bank has a steep slope. The tunnel anchorage method is adopted. The length of the tunnel anchorage section is 35m, and the section is horseshoe-shaped. 7.8×9.1m, section width 7.5m, upper arch diameter 7.8m, straight section height 6m, gradient section bottom height 9.1m. Set the prestressed rock on the back side of the tunnel anchor, and set 8 bundles of prestressed anchor cables, th...

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PUM

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Abstract

The invention relates to a suspension conduit bridge tunnel type anchorage main cable anchoring system. The suspension conduit bridge tunnel type anchorage main cable anchoring system comprises an anchor plug and a prestressed anchor cable, wherein the outside of the head of the anchor plug is provided with a main cable anchoring base, the outside of the tail of the anchor plug is provided with anintegrated anchor plate, the inside of the anchor plug is provided with a plurality of prestressed steel strands, one end of every prestressed steel strand is anchored onto the main cable anchoring base, and the other end of the prestressed steel strand is fixed onto the integrated anchor plate; one end of the prestressed anchor cable is anchored onto the rear surrounding rock of an anchoring site, the other end of the prestressed anchor cable is anchored onto the integrated anchor plate, and under the action of the prestressed anchor cable, the rear surrounding rock of the anchoring site andthe anchor plug are connected into a whole to together bear stress and resist tension of an external main cable, by connecting the surrounding rock of the anchoring site and the anchor plug into a whole through the prestressed anchor cable and the prestressed steel strands to together bear stress, the suspension conduit bridge tunnel type anchorage main cable anchoring system can achieve the aimof improving the tunnel anchorage safety coefficient and reducing the excavation size of the anchor plug under the rock conditions of poor geological conditions, low surrounding rock strength and structural fracture development.

Description

technical field [0001] The invention relates to a main cable anchoring system for a tunnel-type anchorage of a suspension pipeline bridge, belonging to the field of oil and gas pipeline spanning engineering design. Background technique [0002] Suspended cable spanning is one of the common methods for long-distance oil and gas pipelines to cross obstacles such as rivers, lakes, and canyons. As the four main structures for suspension cables to span, anchorage is the key component for anchoring the main cable and transmitting huge tension to the foundation. It is mainly divided into self-anchored and ground-anchored. The completed oil and gas pipeline suspension bridges all use ground-anchored anchorage . According to the difference between the anchor body and the foundation connection mode, the ground anchor anchor is divided into gravity anchor and tunnel anchor. , so the volume is large, the cost is high, and the large-volume foundation pit greatly disturbs the surroundin...

Claims

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Application Information

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IPC IPC(8): E01D19/14E01D101/28
Inventor 左雷彬陈晓辉詹胜文李国辉任文明徐大宝马晓成铁明亮杨威倪娜
Owner BC P INC CHINA NAT PETROLEUM CORP
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