A Hydraulic Tunnel Graded Yield Support Structure and Construction Method

Abstract

The invention discloses a hydraulic type tunnel grading yield supporting structure and a construction method, mainly applies to tunnel engineering, and belongs to the field of tunnel supporting construction. The structure is composed of a yield anchoring rod, an outer arched frame, an inner arched frame and a cushion plate, the yield anchoring rod is composed of a connecting rod and a hydraulic device, the outer arched frame is composed of an arched ring, a clamping groove and a hydraulic device, the inner arched frame is composed of an arched section and a hydraulic device, the inner arched frame is sleeved with the inner side of the outer arched frame, a hydraulic device cover plate of the outer arched frame is welded to a cushion plate channel steel web, the edge of the cushion plate channel steel web is clamped in the outer side of the inner arched frame, a cushion plate inner bearing abuts against the end of the arched section, a manner the same as the manner which is adopted by the connecting point of the outer arched frame and the cushion plate is adopted by the intersection point of the yield anchoring rod and the inner arched frame to place the cushion plate on the inner side of the inner arched frame, and a connecting rod of the yield anchoring rod sequentially penetrates through the cushion plate, the inner arched frame and the outer arched frame to form the hydraulic type tunnel grading yield supporting structure. The structure has the advantages that the anchoring rod and the arched frame are allowed to deformed synergistically, grading yield can be achieved, the yield amount is increased, and therefore the smaller peripheral rock pressure is borne by the structure.

Description

technical field [0001] The invention relates to a hydraulic tunnel graded yield support structure and a construction method, which are mainly used in tunnel engineering and belong to the field of tunnel support construction. Background technique [0002] In recent years, with the continuous advancement of my country's infrastructure construction, the number of mining, tunnel, water conservancy and hydropower projects has continued to increase, especially in mountainous areas. a major challenge. In view of the characteristics of large deformation and difficult support of deep high geostress soft rock chambers, a lot of research has been done on the support of deep high geostress soft rock chambers at home and abroad. However, the effects of these support forms are not very satisfactory. [0003] The existing steel frame is composed of multiple arch sections. The disadvantage is that the arch sections are welded or riveted and cannot be stretched, so the arch frame cannot coo...

AI Technical Summary

Problems solved by technology

In view of the characteristics of large deformation and difficult support of deep high geostress soft rock chambers, a lot of research has been done on the support of deep high geostress soft rock chambers at home and abroad. support, flexible steel frame support, anchor mesh spraying and flexible steel frame joint support, etc., but the effects of these support forms are not very ideal

[0003] The existing steel frame is composed of multiple arch sections. The disadvantage is that the arch sections are welded or riveted and cannot be stretched, so the arch frame cannot cooperate with the surrounding rock to deform; patent (application number: 201520369326.1) A telescopic ring-shaped steel frame is disclosed, which solves the problem that the traditional steel frame cannot be stretched. However, during the deformation process of this type of steel frame, the separation between the arch joints is likely to cause the snap ring to yield and fail, resulting in failure of the support. ;Patent (Application No.: 201520226686.6) discloses an adjustable tunnel support structure, a support stress regulator is set between adjacent arch nodes, and the internal stress of the support structure can be effectively released by adjusting the deformation of the spring , so that it deforms together with the surrounding rock, but the deformation controlled by the utility model is relatively small. Under greater pressure

On the one hand, the existing support structure cannot reasonably consider the cooperative work between the structures. The combined use of the yield structure and the ordinary support structure makes the yield structure unable to deform effectively, and the ordinary support structure fails due to excessive deformation. , the radial elongation of the anchor rod and the circumferential contraction of the arch frame cause shear stress on both, resulting in shear failure of the anchor rod; on the other hand, the limited yield cannot effectively release the surrounding rock pressure, the existing yield The support structure can shrink and deform properly, but due to the increase of the curvature of the structure, the increase of the internal force of the support structure, the separation of the joints at the ends of the joints, and the easy shear failure of the joints, the shrinkage deformation process of the arch can only be Limited deformation can not effectively release the surrounding rock stress, so that the structure is still in a high-stress environment, resulting in yield failure of the support structure

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