Drilling Construction Method of Double-layer Casing Reinforced Double-pipe Shed and Pipe in Railway Underpassing Highway Tunnel

Abstract

The invention discloses a railway down-traversing highway tunnel double-layer casing pipe reinforcement double-pipe shed follow-pipe drilling construction method. The method comprises the following steps that construction preparation is made, wherein existing tunnel defects are surveyed; secondly, advance geology forecast is conducted; double-layer pipe shed advance pre-reinforcement is conducted, wherein the double-layer pipe shed advance pre-reinforcement is adopted, a follow-pipe drilling method is adopted in construction, each segment of a single-hole steel pipe is installed after being drilled by one segment, after each hole is formed, the hole can be grouted immediately, drilling gaps are filled, and a periphery surrounding rock is reinforced; fourthly, excavating and supporting are conducted, wherein excavating is conducted through a double-side-wall drift heading technology, a fracture full ring is excavated, and double layers of supports of a structural steel frame and a grid steel frame are arranged; fifthly, secondary lining is conducted, wherein a curved wall composite lining with an inverted arch is adopted; and sixthly, construction is finished, and monitoring and measuring are conducted. According to the construction method, the excavation technology is reasonably selected, the effective advance reinforcing measure is taken, and the tunnel down-traversing construction is stably and safely finished.

Description

technical field [0001] The invention relates to a drilling construction method of a double-layer casing reinforced double-pipe shed and pipe drilling in a road tunnel passing under a railway, which can be widely used in the construction of existing tunnels passing under mountain tunnels such as roads, railways, energy, and water conservancy. Background technique [0002] With the rapid development of my country's transportation industry, high-grade highways and railways cross vertically and vertically, running through the north and south. When new lines pass through hills and mountainous areas, it is more and more common for new tunnels to pass through existing tunnels. When the tunnel is under construction, the distance between the vault of the new tunnel and the floor of the existing tunnel is small, and the deflection of the surrounding rock between the structures due to blasting vibration is likely to cause local or overall instability and collapse of the vault rock surro...

AI Technical Summary

Problems solved by technology

When the tunnel is under construction, the distance between the vault of the new tunnel and the floor of the existing tunnel is small, and the deflection of the surrounding rock between the structures due to blasting vibration is likely to cause local or overall instability and collapse of the vault rock surrounding, causing safety accidents and affecting the existing tunnel normal function

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