Combined support device of network frame and concrete and application method in underground engineering

Abstract

The invention discloses a combined supporting device consisting of a net stand and concrete and an application thereof in the underground engineering. The net stand is composed of a plurality of horizontal, vertical, cable-stayed connecting pipe fittings connected by multidirectional joints, and an anchor rod and an anchor pile are connected with the net stand through a pad and nuts, and connected with surrounding rock at the other end, wherein the gap between the net stand and surrounding rock is filled with the concrete. The application comprises the steps of manufacturing of multidirectional joints and connecting pipe fittings, connection of steel bushing cylindrical joints and the net stand, hanging of steel net pieces between net stand and surrounding rock and filling of filling backboard bag with concrete or sprayed concrete after the installation of the net stand, and hanging of a flexible film pump at the inner side of the net stand to inject the concrete to form the net stand and concrete combined support. The invention is characterized by ready-to-install structure, simple use, low cost, good entirety and rational structure stress to co-load the ground pressure through the entirety formed by the net stand and surrounding rock. The invention is especially suitable for the tunnel support of bad grounds which contain water and feature quagginess and fractures and other complex stratums, and is widely used for the temporary or permanent support of subsurface engineering such as mine workings, traffic tunnels, water conservancy and national defense.

Description

technical field [0001] The invention relates to an underground engineering supporting device, in particular to a network frame and concrete combined supporting device and an application method in underground engineering. Background technique [0002] At present, underground projects such as mine shafts, roads and railway tunnels, hydropower tunnels, etc. need temporary and permanent support. combination of methods, etc. The above-mentioned support method is used for different strata support according to its characteristics, but due to the limitation of its application range, the above-mentioned method still cannot achieve a satisfactory support effect in some special strata at present, such as large-section shafts in soft strata or In the tunnel, anchor rods cannot be installed due to the soft ground; sprayed concrete and cast-in-place concrete need time to solidify and cannot be supported in time; steel supports can only be installed after full-section excavation, and roof...

AI Technical Summary

Problems solved by technology

The above-mentioned support method is used for different strata support according to its characteristics, but due to the limitation of its scope of application, the above-mentioned method still cannot achieve a satisfactory support effect in some special strata at present, such as large-section shafts in soft strata or In the tunnel, anchor rods cannot be installed due to the soft ground; sprayed concrete and cast-in-place concrete need time to solidify and cannot be supported in time; steel supports can only be installed after full-section excavation, and roof collapse may occur during the excavation process. Bracket cannot be installed

Therefore, it is generally necessary to use expensive special construction methods (freezing method) in soft and broken strata, which greatly increases the project cost and prolongs the construction period.

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