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Anchored roadbed widening method

A subgrade and road technology, applied in roads, roads, buildings, etc., can solve the problems of complex construction steps and insignificant settlement effect, and achieve the effect of controlling uneven settlement, ensuring bearing capacity, and avoiding sliding.

Inactive Publication Date: 2012-08-01
SHIJIAZHUANG TIEDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above two methods can realize road widening and anchoring, the construction steps are more complicated, and the effect of preventing settlement is not obvious when carrying a large vehicle load

Method used

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Embodiment Construction

[0024] According to attached figure 1 It can be seen that the present invention specifically relates to a method for widening an anchored road subgrade, and the specific steps of the method are as follows:

[0025] 1. The slope of the old subgrade 6 is cut by 30-50cm, and the surface soil and humus are removed;

[0026] 2. Excavate steps 7 with a height of 60-100 cm and a width of 90-150 cm on the slope 6 of the old subgrade from the ground;

[0027] 3. Drill anchor holes 2 with a diameter of φ80-100mm at the intersection of the vertical surface and the horizontal surface of the excavated steps along the direction of 15-30 degrees to the horizontal surface. The depth of the anchor holes 2 is 3-5m, and the distance along the line is about 2m;

[0028] 4. Put a steel bar 4 with a diameter of 8-10mm in the anchor hole 2, the steel bar is exposed 5-10cm, and the end hook 3 is folded upward to form an angle of 90 degrees, and the exposed part of the steel bar 4 is treated with ant...

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Abstract

The invention discloses an anchored roadbed widening method, which belongs to the technical field of road construction. The anchored roadbed widening method comprises the following steps of: firstly performing slope cutting on an old roadbed slope, then excavating a step on the old roadbed slope from the ground, obliquely drilling an anchorage hole into an old roadbed at the joint of the vertical plane of the step and the horizontal plane, placing a steel bar into the anchorage hole, and casting the steel bar and the old roadbed into a whole by pouring cement grout; laying a new roadbed in layers, rolling, flatly laying a geogrid on the step of the old roadbed when the new roadbed is filled to be aligned with the step of the old roadbed provided with the anchorage drilled hole, connecting a transverse rib of the geogrid with an end hook which is bent upwards of the exposed part of the steel bar, tensing the geogrid, fixing with the lower layer of a soil body, and finally filling soil on the geogrid and rolling. According to the anchored roadbed widening method disclosed by the invention, an anchor rod technology is used for reinforcing the old roadbed slope, the geogrid and the old roadbed are connected into a whole, the geogrid can be prevented from sliding on the step of the old roadbed, the stability of the new roadbed and the old roadbed is improved, and non-uniform sedimentation can be effectively controlled.

Description

technical field [0001] The invention relates to a construction method for road widening, which belongs to the technical field of road construction, in particular to an anchored road subgrade widening method. Background technique [0002] Due to the limitation of the design concept and design level during the construction period, most of the expressways in our country adopt two-way four-lane. With the development of social economy and the increasing traffic flow, the road can no longer adapt to the development and needs of modern transportation, and the road is widened. Transformation has become a hot issue in the field of transportation. In the widening and expansion project of expressway subgrade, due to the difference in structure and strength between the new and old roads, as well as the uneven settlement of the new and old roads and the continuous effect of vehicle loads, this will involve the effective lapping of the old and new road surfaces . The conventional method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00E01C3/04
Inventor 杨广庆陈君朝郑瑞军张保俭周乔勇熊保林
Owner SHIJIAZHUANG TIEDAO UNIV
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