CN-116804318-B - Pre-buried grouting reinforcement method for junction surface of new and old embankments for highway reconstruction and expansion

CN116804318BCN 116804318 BCN116804318 BCN 116804318BCN-116804318-B

Abstract

The invention discloses a pre-buried grouting reinforcement method for a junction surface of a new and old road embankment for highway reconstruction and expansion, which comprises the steps of calibrating positions and lines of grouting pipe networks to be paved on a cleaned slope according to design requirements, paving grouting pipe networks of grid-shaped structures along the slope of the original road embankment, installing grouting pipes and grouting valves on the tops of the grouting pipe networks, filling and rolling to the design elevation layer by layer according to the compactness and rolling thickness required by the design requirements, grouting reinforcement, stopping grouting construction for 14 days, detecting grouting reinforcement effects, cutting off grouting pipes on the tops of the road embankments after the design requirements are met, and finally forming the junction of the new and old road embankments on a foundation to comprise the original road embankment, the grid-shaped structures filled with grouting bodies and the expanded road embankment formed by PVC pipes, thereby realizing efficient reinforcement of the junction of the new and old road embankment. The method can avoid excavation of the earth and stone mixed filling embankment reconstruction and expansion steps, effectively shorten the construction time, improve the grouting efficiency and ensure the reinforcement quality.

Inventors

SUN LIQIANG
SUN QUANZHI
FENG SHOUZHONG
SHI PENG
LANG RUIQING
ZHOU LONG
TIAN YUHANG
XIE DESHAN

Assignees

天津大学

Dates

Publication Date: 20260508
Application Date: 20230627

Claims (2)

1. The embedded grouting reinforcement method for the junction surface of the new and old road embankments in highway reconstruction and expansion is characterized by comprising the following steps of: step 1) cleaning the slope before construction, namely cleaning the slope and the surface layer of the original embankment (1), leveling the slope of the original embankment (1), and calibrating the position and the line of a grouting pipe network to be paved on the cleaned slope according to the design requirement; Step 2) a grouting pipe network is paved along the slope of an original embankment, wherein the grouting pipe network is fixed at a preset position through steel anchor pipe clamps (4), the grouting pipe network comprises a plurality of horizontal grouting flower pipes (5) and a plurality of vertical grouting flower pipes (6) along a slope, grouting holes (7) are respectively formed in pipe bodies of the horizontal grouting flower pipes (5) and the vertical grouting flower pipes (6) along the slope, the horizontal grouting flower pipes (5) are arranged on the slope of the original embankment (1) along the trend of the embankment at intervals in parallel, the vertical grouting flower pipes (6) along the slope of the embankment are arranged on the slope of the original embankment (1) at intervals in a vertical direction of the slope, the horizontal grouting flower pipes and the vertical grouting flower pipes along the slope are connected through pipeline connectors to form a grid-shaped structure, grouting pipes (10) are arranged at the top of the vertical grouting flower pipes (6) along the slope, and grouting valves (11) are arranged on the grouting pipes (10); Step 3) reconstructing and expanding the embankment, namely filling and rolling the embankment layer by layer according to the compactness and the rolling thickness required by the design to reach the design elevation; Step 4) grouting reinforcement, namely connecting grouting equipment with the grouting guide pipe (10), opening the grouting valve (11), grouting according to the designed grouting pressure and grouting amount, closing the grouting valve (11) when the designed grouting amount is finished, and stopping grouting; Step 5) grouting reinforcement detection, namely, detecting grouting reinforcement effect 14 days after stopping grouting construction, and cutting off redundant grouting guide pipes (10) and grouting valves (11) at the top of the embankment after meeting design requirements; The combination part of the new embankment and the old embankment finally formed on the foundation (2) comprises the original embankment (1), a grid-shaped grid structure formed by PVC pipes and filled with grouting bodies and an extension embankment (3); The horizontal grouting flower pipe, the vertical grouting flower pipe along the slope and the pipeline connecting piece are connected in an inserted mode, and the connecting part is sealed through a rubber ring; The pipeline connecting piece comprises a three-way connecting piece (8) and a four-way connecting piece (9); The outside of the pipe bodies of the horizontal grouting floral pipe (5) and the vertical grouting floral pipe (6) along the slope is wrapped with a reverse filtering geotextile (12).
2. The method for reinforcing the embedded grouting of the junction surface of the new and old road embankments for highway reconstruction and expansion according to claim 1, wherein the horizontal grouting pipe and the vertical grouting pipe are hard PVC pipes, the pipe diameter is 75mm, the aperture of the grouting holes (7) on the pipe body is 10mm, and the distance is 100mm.

Description

Pre-buried grouting reinforcement method for junction surface of new and old embankments for highway reconstruction and expansion Technical Field The invention belongs to the field of highway engineering, and relates to a pre-buried grouting reinforcement technology for a junction surface of a new and old embankment for highway reconstruction and expansion. Background Along with the rapid development of the economic society in China, the traffic demand is increased. Part of the original two-way four-lane roads are difficult to meet the traffic conditions required by economic development, and each grade of roads needs reconstruction, expansion and upgrading. The expressway reconstruction and expansion traditional design and construction method is that steps are excavated on old embankments, then the expansion embankments are filled, the excavated steps can ensure that the combination surfaces of new embankments and old embankments have good biting force, the strength of the old embankments can be fully utilized, the combination positions of the new embankments and the old embankments are prevented from being subjected to larger shearing deformation, and the combination surfaces of the new embankments and the old embankments are prevented from sliding and unstably. However, for earth and stone mixed filler embankments, large-particle-size broken stones cause large difficulty in step excavation construction, difficult quality control and poor economical efficiency. Therefore, a novel and efficient technology for reinforcing the junction of the new and old embankments is needed, so that the step excavation at the junction of the new and old embankments can be avoided, and the novel reinforcing technology with enough rigidity and strength at the junction of the new and old embankments can be ensured. The economic and efficient operation of the highway reconstruction and expansion engineering is ensured. Disclosure of Invention Aiming at the prior art, the invention provides a method for reinforcing the junction surface of the new and old embankments by grouting through the embedded grouting pipe network in the road reconstruction and expansion engineering. In order to solve the technical problems, the invention provides a pre-buried grouting reinforcement method for a junction surface of a new and old road embankment for highway reconstruction and expansion, which comprises the following steps: step 1) cleaning the slope before construction, namely cleaning the slope and the surface layer of the original embankment, leveling the slope of the original embankment, and calibrating the position and the line of a grouting pipe network to be paved on the cleaned slope according to the design requirement; Step 2) paving a grouting pipe network along the slope of an original embankment, wherein the grouting pipe network is fixed at a preset position through steel anchor pipe clamps and comprises a plurality of horizontal grouting flower pipes and a plurality of vertical grouting flower pipes along a slope, the horizontal grouting flower pipes and the vertical grouting flower pipes along the slope are respectively provided with grouting holes, the horizontal grouting flower pipes are arranged on the slope of the original embankment along the trend of the embankment at intervals in parallel, the vertical grouting flower pipes along the slope are arranged on the slope of the original embankment at intervals along the trend of the embankment at intervals and coincide with the slope of the original embankment, the horizontal grouting flower pipes and the vertical grouting flower pipes along the slope are connected through pipeline connectors to form a grid-shaped structure, grouting pipes are arranged at the tops of the vertical grouting flower pipes along the slope, and grouting valves are arranged on the grouting pipes; Step 3) reconstructing and expanding the embankment, namely filling and rolling the embankment layer by layer according to the compactness and the rolling thickness required by the design to reach the design elevation; Step 4) grouting reinforcement, namely connecting grouting equipment with the grouting guide pipe, opening the grouting valve, grouting according to the designed grouting pressure and grouting amount, closing the grouting valve when the designed grouting amount is completed, and stopping grouting; And 5) grouting reinforcement detection, namely, detecting grouting reinforcement effect 14 days after grouting construction is stopped, and cutting off redundant grouting guide pipes and grouting valves at the top of the embankment after the design requirements are met. The structure of the joint of the new embankment and the old embankment finally formed on the foundation is a grid-shaped structure which is formed by PVC pipes and is filled with grouting bodies and comprises an original embankment and an enlarged embankment and is pre-buried between the original embankment and the enlarged embankm