Steel casing grouting method

1.What is steel casing pipe grouting?

Steel casing pipe grouting is a commonly used geological engineering construction method and is widely used in tunnels, bridges, water conservancy projects, drilling and other fields. Its main function is to reinforce and seal underground cavities and cracks to prevent geological disasters.During the casing pipe grouting construction process, certain processes and standards need to be followed to ensure construction quality and safety. The following is a detailed introduction to the construction process of octg casing pipe grouting.

2. Preparation materials for steel casing pipe grouting

(1)Grouting material

Select appropriate grouting materials according to project requirements, such as cement, polyurethane, epoxy resin, etc.

(2) Steel casing pipe

Select casing pipe of appropriate specifications and length, and the steel casing pipe material should meet the engineering design requirements.

(3)Grouting equipment

Select appropriate grouting equipment, including grouting pumps, pressure gauges, valves, hoses, etc.

(4)Other auxiliary materials

Such as sandbags, cement mortar, etc.

3. How to prepare for steel casing pipes grouting?

(1) Clean the hole

Clean the debris and soil around the hole to facilitate construction.

(2) Install steel mesh

According to the design requirements, a steel mesh is installed inside the opening to enhance the consolidation ability after grouting.

(3) Install steel casing pipe

Install the steel casing pipe vertically or obliquely in the hole according to the design requirements. Generally, the length of the steel casing pipe should exceed the depth of the hole by 1 to 2 meters.

(4) Install grouting equipment

Select appropriate locations to install equipment such as grouting pumps and pressure gauges based on site conditions.

(5) Set up grouting port

A grouting port is provided at the top of the steel casing pipe to facilitate grouting operations.

4.Steel casing pipe grouting construction

(1) Pre-grouting

Inject the pre-prepared cement mortar into the steel casing pipe from the grouting port to fill the gaps around the hole to ensure that the grouting material can fully fill the inside of the steel casing pipe and avoid leakage of grouting. After pre-grouting, it needs to be consolidated within a certain period of time to ensure the stability of subsequent grouting construction.

(2)Main grouting

Control the grouting pressure and flow rate according to the design requirements, inject the grouting material into the steel casing pipe from the grouting port, and evenly fill the gaps around the hole. During the grouting process, it is necessary to continuously observe changes in grouting pressure and flow, and adjust grouting parameters in time to ensure uniform grouting.

(3) Diffusion grouting

After the main grouting is completed, diffusion holes are set on the top and side walls of the steel casing pipe according to the design requirements, and the grouting material is injected from the holes to fill the gaps around the steel casing pipe to enhance the consolidation ability after grouting.

(4) Block the orifice

After grouting is completed, the grouting opening and diffusion holes need to be blocked in time to avoid leakage of grouting.

5. Finishing work

(1) Clean up the scene

Clean the construction site and remove unnecessary equipment and materials.

(2) Check quality

Check the construction quality to ensure that the grouting effect meets the engineering design requirements.

(3)Record information

Record and archive the construction process, including data such as grouting pressure, flow rate, and usage of grouting materials.

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