A pre-buried grouting reinforcement method for a new and old embankment combination surface of highway reconstruction and extension

Abstract

The application discloses a kind of highway reconstruction and expansion new old road embankment joint surface pre-buried grouting reinforcement method, comprising: the position and line of the grouting pipe network to be laid are demarcated on the slope surface after cleaning according to design requirements;Grouting pipe network of grid net structure is laid along the original embankment slope, and grouting guide pipe and grouting valve are installed on the top of grouting pipe network;According to the compaction degree and the rolling thickness of design requirement, fill and compact construction to design elevation layer by layer;Grouting reinforcement;14 days after stopping grouting construction, the grouting reinforcement effect is detected, the grouting guide pipe on the top of embankment is cut off after meeting the design requirements;Finally, the new old embankment joint on the foundation includes original embankment, grid net structure filled with grouting body formed by PVC pipe and expansion embankment;So as to realize the efficient reinforcement of new old embankment joint part.The method can avoid the excavation of soil and rock mixed embankment reconstruction and expansion steps, effectively shorten the construction time and improve the grouting efficiency, and ensure the reinforcement quality.

Description

Technical Field

[0001] This invention belongs to the field of highway engineering and relates to a pre-embedded grouting reinforcement technology for the interface between new and old embankments in highway reconstruction and expansion. Background Technology

[0002] With the rapid development of my country's economy and society, the demand for transportation has surged. Some existing four-lane highways are no longer sufficient to meet the transportation needs of economic development, and highways at all levels urgently require reconstruction, expansion, and upgrading. The traditional design and construction method for highway reconstruction and expansion involves excavating steps on the old embankment before filling the new embankment. These excavated steps ensure good interlocking force at the interface between the old and new embankments, fully utilizing the strength of the old embankment and preventing significant shear deformation and slippage at the interface. However, for embankments with mixed soil and rock fill, large-diameter gravel makes step excavation difficult, quality control challenging, and economically inefficient. Therefore, a new and efficient technology for reinforcing the interface between old and new embankments is urgently needed. This new reinforcement technology should avoid step excavation at the interface while ensuring sufficient rigidity and strength, thus guaranteeing the economical and efficient operation of highway reconstruction and expansion projects. Summary of the Invention

[0003] In view of the above-mentioned prior art, the present invention provides a method for reinforcing the interface between new and old embankments by grouting with a pre-embedded grouting pipeline network in highway reconstruction and expansion projects. This reinforcement method can avoid the excavation of steps in highway reconstruction and expansion projects, effectively shorten the construction time, save construction costs, improve the efficiency of grouting reinforcement, and ensure the quality of reinforcement.

[0004] To address the aforementioned technical problems, this invention proposes a pre-embedded grouting reinforcement method for the interface between new and old embankments in highway reconstruction and expansion, comprising the following steps:

[0005] Step 1) Slope clearing before construction: Clear the original embankment slope and surface layer, level the existing embankment slope, and mark the location and route of the grouting pipeline to be laid on the cleared slope according to the design requirements;

[0006] Step 2) Laying the grouting pipe network along the existing embankment slope: The grouting pipe network is fixed in the preset position using steel anchor pipe clamps. The grouting pipe network includes multiple horizontal grouting pipes and multiple vertical grouting pipes along the slope. Each of the horizontal grouting pipes and the multiple vertical grouting pipes along the slope has a grout outlet hole. The horizontal grouting pipes are arranged horizontally and parallelly along the embankment slope at intervals. The vertical grouting pipes along the slope are arranged perpendicular to the embankment slope at intervals, matching the existing embankment slope. The horizontal grouting pipes and the vertical grouting pipes along the slope are connected by pipe connectors to form a grid structure. A grouting guide pipe is installed at the top of each vertical grouting pipe along the slope, and a grouting valve is installed on the grouting guide pipe.

[0007] Step 3) Construction of the embankment for reconstruction and expansion: Fill and compact the embankment layer by layer according to the compaction degree and rolling thickness required by the design to the design elevation;

[0008] Step 4) Grouting reinforcement: Connect the grouting equipment to the grouting conduit, open the grouting valve, and grout according to the designed grouting pressure and grouting volume; when the designed grouting volume is completed, close the grouting valve and stop grouting;

[0009] Step 5) Grouting Reinforcement Inspection: 14 days after grouting construction is stopped, inspect the grouting reinforcement effect. If it meets the design requirements, remove the excess grouting pipes and valves on the top of the embankment. The final structure formed at the junction of the old and new embankments on the foundation consists of the original embankment and the expanded embankment, as well as a grid-like structure filled with grout and formed by PVC pipes embedded between the original and expanded embankments.

[0010] Furthermore, in the pre-embedded grouting reinforcement method for the interface between new and old embankments in highway reconstruction and expansion as described in this invention:

[0011] Both the horizontal and vertical grouting pipes are made of rigid PVC pipes with a diameter of 75mm. The grouting holes on the pipes have a diameter of 10mm and a spacing of 100mm.

[0012] The horizontal grouting pipe and the vertical grouting pipe along the slope are connected to the pipe connector by an insertion type, and the connection part is sealed by a rubber ring.

[0013] The pipe fittings include tee fittings and cross fittings.

[0014] The horizontal grouting pipe and the vertical grouting pipe along the slope are wrapped with reverse filter geotextile.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] (1) It can avoid the excavation of steps in the reconstruction and expansion of embankments with mixed soil and rock filling, thus reducing the difficulty of construction;

[0017] (2) It can effectively shorten the construction time and reduce the construction cost;

[0018] (3) Pre-embedded grouting pipeline network grouting can improve grouting efficiency and ensure reinforcement quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the grouting pipeline system used in this invention being laid on the original embankment slope.

[0020] Figure 2 This is a schematic diagram showing the layout of the grouting pipeline system used in this invention during the construction of an expanded embankment;

[0021] Figure 3 This is a cross-sectional view of a highway after grouting reinforcement following the implementation of this invention.

[0022] Figure 4 Schematic diagram of the cross-section of the horizontal and vertical grouting pipes along the slope;

[0023] Figure 5 This is a schematic diagram of the cross-section of the grouting conduit.

[0024] In the picture:

[0025] 1-Existing embankment 2-Foundation 3-Expanded embankment

[0026] 4-Steel anchor pipe clamp; 5-Horizontal grouting perforated pipe; 6-Vertical grouting perforated pipe along slope.

[0027] 7-Slurry outlet hole; 8-T-connector; 9-Four-way connector

[0028] 10-Grouting pipe; 11-Grouting valve; 12-Reverse filter geotextile. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention.

[0030] This invention proposes a method for pre-embedded grouting reinforcement of the interface between new and old embankments in highway reconstruction and expansion, which includes the following steps:

[0031] Step 1) Slope clearing before construction:

[0032] Clear the weeds and topsoil from the original embankment slope 1, level the existing embankment slope 1, and mark the location and route of the grouting pipeline to be laid on the cleared slope according to the design requirements.

[0033] Step 2) Lay the grouting pipe network along the existing embankment slope:

[0034] like Figure 1 and Figure 2As shown, a grouting pipe network is laid at the marked position on the slope of the old embankment 1 after slope clearing. The grouting pipe network is fixed in the preset position by steel anchor pipe clamps 4. The grouting pipe network includes multiple horizontal grouting pipes 5 and multiple vertical grouting pipes 6 along the slope. Each of the horizontal grouting pipes 5 and the multiple vertical grouting pipes 6 along the slope is provided with a grout outlet hole 7. The horizontal grouting pipes 5 are arranged horizontally and parallelly along the embankment direction on the slope of the original embankment 1 at intervals. The vertical grouting pipes 6 are arranged perpendicular to the embankment direction at intervals and in a direction that matches the slope of the original embankment 1. In this embodiment, both the horizontal grouting pipes 5 and the vertical grouting pipes 6 are made of rigid PVC pipes with a diameter of 75mm. The diameter of the grouting holes 7 on the pipes is 10mm and the spacing is 100mm. Meanwhile, the horizontal grouting pipe 5 and the vertical grouting pipe 6 along the slope are wrapped with reverse filter geotextile 12.

[0035] The horizontal grouting pipe 5 and the vertical grouting pipe 6 along the slope are connected by pipe connectors to form a grid structure; the horizontal grouting pipe 5 and the vertical grouting pipe 6 are connected to the pipe connectors by an insertion method, such as... Figure 4 and Figure 5 As shown, the pipe connector may be a tee connector 8 or a four-way connector 9 depending on its position, and the connection is sealed with a rubber ring.

[0036] After the grouting pipeline is laid according to the location and route, a grouting conduit 10 is installed on the top of the vertical grouting pipe 6 along the slope, and a grouting valve 11 is installed on the grouting conduit 10.

[0037] Step 3) Construction of embankment reconstruction and expansion:

[0038] After the grouting pipeline network is laid and installed along the slope of the original embankment 1, the embankment 3 expansion construction is carried out. The embankment is filled and compacted layer by layer according to the compaction degree and rolling thickness required by the design to the design elevation.

[0039] Step 4) Grouting reinforcement:

[0040] After the embankment 3 is filled, the grouting equipment is connected to the grouting pipe 10, the grouting valve 11 is opened, and grouting is performed according to the designed grouting pressure and grouting volume; when the designed grouting volume is completed, the grouting valve 11 is closed and grouting is stopped.

[0041] Step 5) Grouting reinforcement inspection:

[0042] Fourteen days after the grouting construction is completed, the grouting reinforcement effect is tested, including the thickness and strength of the grouting reinforcement layer. After meeting the design requirements, the excess grouting pipes 10 and grouting valves 11 at the top of the embankment are removed to facilitate the construction of the superstructure.

[0043] After construction according to the above steps, the final structure formed on the foundation at the junction of the old and new embankments is a grid-like structure made of PVC pipes filled with grout, which includes the original embankment and the expanded embankment, and is embedded between the original embankment and the expanded embankment. This achieves efficient reinforcement of the junction of the old and new embankments.

[0044] Although the present invention has been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many modifications under the guidance of the present invention without departing from the spirit of the present invention, and these modifications are all within the protection scope of the present invention.

Claims

1. A method for pre-embedded grouting reinforcement of the interface between new and old embankments in highway reconstruction and expansion, characterized in that, The following steps are adopted: Step 1) Slope clearing before construction: Clear the original embankment (1) slope and surface, level the original embankment (1) slope, and mark the location and route of the grouting pipeline to be laid on the cleared slope according to the design requirements; Step 2) Laying grouting pipe network along the existing embankment slope: The grouting pipe network is fixed in the preset position by steel anchoring pipe clamps (4). The grouting pipe network includes multiple horizontal grouting perforated pipes (5) and multiple vertical grouting perforated pipes (6) along the slope. Each of the horizontal grouting perforated pipes (5) and the multiple vertical grouting perforated pipes (6) is provided with a grout outlet (7). The horizontal grouting perforated pipes (5) are arranged horizontally and parallelly along the embankment at intervals along the original slope. On the slope of the embankment (1), the vertical grouting pipes (6) are arranged perpendicular to the direction of the embankment and in line with the slope of the original embankment (1). The horizontal grouting pipes and the vertical grouting pipes are connected by pipe connectors to form a grid structure. A grouting conduit (10) is installed on the top of the vertical grouting pipes (6), and a grouting valve (11) is installed on the grouting conduit (10). Step 3) Construction of the embankment for reconstruction and expansion: Fill and compact layer by layer according to the compaction degree and rolling thickness required by the design to the design elevation; Step 4) Grouting reinforcement: Connect the grouting equipment to the grouting conduit (10), open the grouting valve (11), and grout according to the designed grouting pressure and grouting volume; when the designed grouting volume is completed, close the grouting valve (11) and stop grouting; Step 5) Grouting reinforcement test: 14 days after the grouting construction is stopped, the grouting reinforcement effect is tested. After the design requirements are met, the excess grouting pipe (10) and grouting valve (11) on the top of the embankment are cut off. The final junction of the old and new embankments formed on the foundation (2) includes the original embankment (1), a grid structure filled with grout formed by PVC pipes, and the expanded embankment (3). The horizontal grouting pipe and the vertical grouting pipe along the slope are connected to the pipe connector by an insertion type, and the connection part is sealed by a rubber ring; The pipe fittings include a tee fitting (8) and a cross fitting (9); The horizontal grouting pipe (5) and the vertical grouting pipe (6) along the slope are wrapped with reverse filter geotextile (12).

2. The method for pre-embedded grouting reinforcement of the interface between new and old embankments in highway reconstruction and expansion according to claim 1, characterized in that, Both the horizontal and vertical grouting pipes are made of rigid PVC pipes with a diameter of 75mm. The grouting holes (7) on the pipe body have a diameter of 10mm and a spacing of 100mm.

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