Collar of retractable arches and retractable arches

Abstract

The invention relates to a collapsible arch frame and a collapsible arch frame, wherein the collapsible arch frame has an upper clamp plate and a lower clamp plate that are detachably connected, and the clamping width of the upper clamp plate is the same as that of the medium-shaped steel of the retractable arch frame. The width of the upper opening is adapted, and the clamping width of the lower clamping plate is adapted to the section width of the medium-shaped steel of the retractable arch frame. The upper end of the side of the lower clamping plate is provided with lower clamping plate ears extending to both sides. Ribs are provided between the upper part and the side of the lower clamping plate; a protruding structure is provided at the upper end of the side of the lower clamping plate for fitting with the fillets of the ears of the section steel. The invention effectively improves the strength and rigidity of the frame, obviously optimizes the structure of the frame and the force condition of the frame, and at the same time greatly improves the sliding stability of the retractable arch joint, and avoids the The occlusal phenomenon occurs during the sliding process of the section steel, thereby avoiding the phenomenon of anti-slipping of the shrinkable arch.

Description

technical field [0001] The invention relates to equipment for building construction, in particular to a retractable arch frame and a retractable arch frame. Background technique [0002] Shrinkable arches are also called flexible arches, which are mainly suitable for the initial support after tunnel excavation, for example, in order to limit the excessive displacement of the surrounding rock and maintain the stability of the surrounding rock and provide the minimum loosening pressure greater than the damage of the surrounding rock. support resistance. Its shape is not limited to round, but also has door arch, horseshoe and other shapes. The surrounding rock of the tunnel shrinks and deforms under the action of the ground stress, and the shrinkable arch shrinks along with the surrounding rock, so that the self-supporting capacity of the surrounding rock can be fully exerted, the pressure of the surrounding rock can be reduced, and a certain amount of deformation of the surro...

AI Technical Summary

Problems solved by technology

[0003] In the existing shrinkable arch structure, it has always been a common problem that the strength of the lap joint of two sections of section steel is weak. The lap joint of two sections of section steel is connected by a card. Increasing, under the action of external force, the overlapping part of the two sections of steel will produce relative slip and contraction, so that the connecting bolts of the card will be subjected to the shear force of the slip, and the card will be greatly bent and the bolts will be bent. When the relative sliding distance exceeds the specified value, the card will be destroyed, which will lead to a significant reduction in the strength of the entire retractable arch, which may cause serious safety problems

Moreover, when the section steel shrinks and slides under the action of external force, the two sections of section steel will also bite each other at the erection, which will cause the shrinkable arch to resist slipping, making it a rigid arch and losing its flexibility. Significance of shrinkage arch itself

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