Grouting device combining exhausting and grout backflow preventing functions and construction method of geotechnical engineering structural elements using the same

Abstract

The invention discloses a grouting device combining exhausting and grout backflow preventing functions and a construction method of geotechnical engineering structural elements using the same, which aims at providing an efficient and low-cost grouting device and a construction method using the same, wherein the grouting device can be adapted for various pore-forming and broaching technologies under complex stratum conditions, can maximally develop self-bearing capability of the soil body and improve full degree and imporosity of the grout in an inter-hole expansion section, can be manufactured industrially, and is convenient in transportation and construction installation. The grouting device combining exhausting and grout backflow preventing functions comprises an upper sleeve subassembly, a lower sleeve subassembly, a foldable expansion extruding cylinder, and an inner grouting pipe and an external grouting pipe, which are connected by a movable joint, the inner grouting pipe is provided with a pneumatic one-way valve and at least one hydraulic one-way valve, at least one vertical pipe is fixed between an upper cover board and a bearing disc, and at least one anchor bar penetrates through the upper cover board and the bearing disc and simultaneously penetrates through the vertical pipe.

Description

technical field [0001] The invention relates to a special equipment and construction method for foundation engineering, in particular to a device for pressing cement slurry through pipelines and a construction method for engineering structural components used in geotechnical engineering structure construction. Background technique [0002] In various geotechnical engineering structure construction technologies, different types of grouting technologies are widely used. With the continuous improvement of grout materials, components, grouting technology and grouting equipment, grouting construction technology has been greatly developed. Among them, the grouting technology in various geological boreholes or long and thin holes, especially the pressure grouting technology has huge development and application space. In terms of grout ratio and materials, low-pollution chemical grout has been continuously developed, modified and used. It has strong permeability, good injectability,...

AI Technical Summary

Problems solved by technology

[0006] 3. Improve the control and application level of grouting technology in the extended field: the application in the extended application field such as foundation reinforcement, anchor hole grouting, hole pressure grouting, expansion and compaction grouting is still relatively extensive. The engineering hydrogeological conditions of the formation are prone to hidden dangers that endanger the overall project quality, such as the development of grouting holes, poor uniformity, difficult control of the diffusion path of the grout, the strength of the stone body lower than the design value, and disorderly discharge of waste slurry.

[0007] 4. When solving problems such as anti-corrosion and complex geological conditions, it often brings contradictions between project cost control and quality management

[0011] 1. Due to the variable length of the anchor bar, it needs to be sealed after wearing the bar at the construction site. In addition, the outer tube of the grouting pipe is very long, so the device can only be manufactured at the construction site. The product quality is not stable, the efficiency is low, the cost is high, and the reliability is poor. , the sealing is difficult to guarantee;

[0012] 2. The gas in the foldable expansion extrusion cylinder cannot be eliminated, resulting in poor density of cement mortar injected into the extrusion cylinder, forming cavities and reducing the bearing capacity;

[0013] 3. After the grouting is stopped, when the external grouting pipe is removed, part of the pressure grout in the extrusion cylinder will overflow, which will reduce the pressure in the capsule, resulting in the final formation of engineering structural components that are not dense and the bearing capacity will be reduced;

[0014] 4. There is quite a long part of the grouting outer pipe left in the hole, which causes waste and increases the project cost

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