CN-122013797-A - Construction method of high and steep side slope and roadbed

CN122013797ACN 122013797 ACN122013797 ACN 122013797ACN-122013797-A

Abstract

The invention relates to a construction method of a high-steep slope and a roadbed, which comprises the following steps of firstly, applying a control line according to a design construction diagram, carrying out layered and segmented excavation, secondly, laying a sample on a foundation layer which is subjected to foundation treatment according to the design construction diagram, determining the installation position of a bottommost gabion retaining wall, thirdly, paving a geogrid on the foundation layer which is subjected to foundation treatment, fourthly, installing a gabion retaining wall on the laid geogrid along the laying sample line, fifthly, paving a water filtering geotechnical cloth on the contact surface of the installed gabion retaining wall and a soil body and the laid geogrid, fifthly, backfilling the soil body, seventhly, repeating the steps until the height of the wall top is designed, and forming a high-compound retaining and high-roadbed structure through combined construction of the gabion retaining wall and the geogrid, thereby solving the limitation of a single structure under a certain complex working condition, and greatly increasing the pavement area after construction is completed.

Inventors

WANG JIE
LI PENGHUI
LI XIAOHUA

Assignees

中国二十冶集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260320

Claims (10)

1. A construction method of a high steep side slope and a roadbed is characterized by comprising the following steps: Step one, applying control lines according to a design construction drawing, and excavating in a layered and segmented mode; step two, lofting on the foundation layer which is subjected to foundation treatment according to the design construction drawing, and determining the installation position of the bottommost gabion retaining wall; Paving a geogrid on the foundation layer subjected to foundation treatment; Fourthly, installing gabion retaining walls on the laid geogrids along a lofting line; Step five, paving water filtering geotextile on the contact surface of the gabion retaining wall and the soil body which are subjected to installation and the paved geogrid; Step six, backfilling soil bodies; and step seven, repeating the step two to the step six until the elevation of the wall top is designed.
2. The construction method of high steep side slope and roadbed according to claim 1, wherein the step two of setting out on the foundation layer which has been completed with foundation treatment according to the design construction diagram, the determination of the installation position of the bottommost gabion retaining wall comprises the following steps: According to the design construction drawing, a measuring instrument is adopted to loft on a base layer which is subjected to foundation treatment, the installation edge line and the axis position of the bottommost gabion net cage are released, the foundation layer is firmly marked by using a wood pile or a steel bar head which is driven into the ground, and an engineering line is pulled to serve as primary control.
3. The construction method of high and steep side slope and roadbed according to claim 1, wherein the step three of laying geogrid on the foundation layer which has been subjected to foundation treatment comprises: before the geogrid is paved, cleaning the surface of a base layer in a paving range, removing sundries, and leveling and compacting; Laying out according to the design construction drawing, and paving the geogrid along a laying-out line, wherein the paving direction of the geogrid is vertical to the axis of the gabion retaining wall; after laying, the two ends of the geogrid are pulled to enable the geogrid to be fully unfolded, smooth and wrinkle-free on a laying plane and in a tight stress state, and U-shaped steel nails are adopted to anchor the geogrid in the base layer.
4. The construction method of the high and steep side slope and the roadbed according to claim 3, wherein two adjacent geogrids are lapped by a single rib, and the lapped part is firmly bound by steel wires.
5. The construction method of the high and steep side slope and the roadbed according to claim 2, wherein the gabion retaining wall comprises a gabion mesh box and a top cover mesh piece of hexagonal double-twisted steel wires, the gabion mesh box is surrounded to form a containing cavity, stone is filled in the containing cavity, and the top cover mesh piece is covered at the top end of the gabion mesh box.
6. The construction method for high and steep side slopes and roadbed according to claim 5, wherein the gabion mesh box comprises a body and an extension part, one end of the extension part is connected with the bottom end of the body, and the other section of the extension part extends to the outside of the body; when backfilling the soil body, the soil body presses the extension part.
7. The construction method of high and steep side slope and roadbed according to claim 5, wherein the step four of installing gabion retaining wall on the laid geogrid along a lofting line comprises the following steps: placing the gabion mesh box along the lofted installation edge line; binding border lines of two adjacent gabion mesh boxes by adopting steel wires to form a firm whole; Tightly binding and connecting the gabion mesh box rear panel with the laid geogrid; Filling stones in the gabion mesh box, and when the stones are filled to the preset height of the gabion mesh box, arranging opposite pull steel wires in the gabion mesh box at intervals of preset distance, and inwards tying opposite meshes; After the stones are filled to the designed elevation and are leveled, the top cover net sheet is covered, and the top cover net sheet and the gabion net box are firmly bound by adopting stranded steel wires.
8. The construction method for high and steep side slopes and roadbed as set forth in claim 7, wherein the porosity of the stone filled in the gabion mesh box is not more than 30%.
9. The construction method for high and steep side slopes and roadbed according to claim 7, wherein the preset distance is 20cm-40cm.
10. The construction method of the high and steep side slope and the roadbed according to claim 1, wherein the step six of backfilling soil body comprises the following steps: sampling the filler to be used and sending the filler to a laboratory for standard compaction test to determine the water content and dry density; paving a layer of loose soil with preset thickness on the paved geogrid to serve as a protective layer; Rolling by adopting a vibratory roller; and in the predicted distance of the gabion retaining wall, manually matching with a small ramming machine to perform layered ramming.

Description

Construction method of high and steep side slope and roadbed Technical Field The invention relates to the technical field of constructional engineering, in particular to a construction method of a high-steep side slope and a roadbed. Background At present, common high-fill slope reinforcement and protection modes comprise slope paving, slope spraying, mixing and planting, gravity type retaining wall, anchor rope retaining and the like. These structures are generally suitable for use on filling slopes of general height. However, when the filling height of the side slope is large, the form is difficult to meet the requirement of structural stability, the construction difficulty is obviously increased, and a slow slope rate is often required, so that the usable area of the road is greatly reduced. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a construction method of a high steep side slope and a roadbed, which has the advantages that the slope ratio of the surface wall can be increased, so that the pavement area is enlarged after the construction is completed. The invention aims at realizing the technical scheme that the construction method of the high and steep side slope and the roadbed comprises the following steps: Step one, applying control lines according to a design construction drawing, and excavating in a layered and segmented mode; step two, lofting on the foundation layer which is subjected to foundation treatment according to the design construction drawing, and determining the installation position of the bottommost gabion retaining wall; Paving a geogrid on the foundation layer subjected to foundation treatment; Fourthly, installing gabion retaining walls on the laid geogrids along a lofting line; Step five, paving water filtering geotextile on the contact surface of the gabion retaining wall and the soil body which are subjected to installation and the paved geogrid; Step six, backfilling soil bodies; and step seven, repeating the step two to the step six until the elevation of the wall top is designed. Preferably, the construction method of high steep side slope and roadbed provided by the invention comprises the following steps of lofting on a foundation layer which is subjected to foundation treatment according to a design construction drawing, and determining the installation position of the bottommost gabion retaining wall, wherein the construction method comprises the following steps: According to the design construction drawing, a measuring instrument is adopted to loft on a base layer which is subjected to foundation treatment, the installation edge line and the axis position of the bottommost gabion net cage are released, the foundation layer is firmly marked by using a wood pile or a steel bar head which is driven into the ground, and an engineering line is pulled to serve as primary control. Preferably, the construction method of the high steep side slope and the roadbed provided by the invention comprises the following steps of: before the geogrid is paved, cleaning the surface of a base layer in a paving range, removing sundries, and leveling and compacting; Laying out according to the design construction drawing, and paving the geogrid along a laying-out line, wherein the paving direction of the geogrid is vertical to the axis of the gabion retaining wall; after laying, the two ends of the geogrid are pulled to enable the geogrid to be fully unfolded, smooth and wrinkle-free on a laying plane and in a tight stress state, and U-shaped steel nails are adopted to anchor the geogrid in the base layer. Preferably, according to the construction method for the high steep side slope and the roadbed provided by the invention, two adjacent geogrids are lapped by adopting a single rib, and the lapped part is firmly bound by steel wires. Preferably, according to the construction method for the high steep side slope and the roadbed provided by the invention, the gabion retaining wall comprises a gabion mesh box with hexagonal double-twisted steel wires and a top cover mesh, wherein the gabion mesh box is surrounded to form a containing cavity, stone is filled in the containing cavity, and the top cover mesh is covered at the top end of the gabion mesh box. Preferably, the construction method for the high steep side slope and the roadbed provided by the invention comprises a body and an extension part, wherein one end of the extension part is connected with the bottom end of the body, the other section of the extension part extends to the outside of the body, and when soil is backfilled, the soil is pressed against the extension part. Preferably, the construction method for high steep side slope and roadbed provided by the invention comprises the following steps: placing the gabion mesh box along the lofted installation edge line; binding border lines of two adjacent gabion mesh boxes by adopting steel wires to form a firm whole; Tightly