Hydraulic fan-shaped support system for controlling steel frame deformation in tunnel construction

Abstract

The invention discloses a hydraulic fan-shaped support system for controlling steel frame deformation in tunnel construction. The support system is characterized in that: a steel box pedestal (1) is placed on the middle part of a tunnel step, a plurality of telescopic hydraulic cylinders (6) with steel sleeves (5) are fixed at the top of the steel box pedestal (1) in a fan-shaped mode, the steel sleeves (5) are sleeved into support steel pipes, and the hydraulic cylinders (6) are connected with a hydraulic system. When great deformation happens under the pressure action of a tunnel surrounding rock at initial support of the tunnel, the support system can be quickly arranged to quickly and effectively provide a stable system supporting force and prevent collapse and support deformation from intruding into the tunnel limit to cause rework; and when the tunnel is normally tunneled and dug below the step, the system is arranged to prevent overlarge deformation, ensure the safety of tunnelconstruction and save the engineering cost.

Description

Technical field [0001] The invention relates to tunnel engineering construction equipment, in particular to a hydraulic fan-shaped support system with a box-shaped steel base for controlling the deformation of the initial support steel frame of the tunnel. Background technique [0002] In tunnel engineering, the excavation of large section tunnels with weak surrounding rock mostly adopts partial excavation methods (such as step method, CD method, CRD method, etc.), among which the step method is more widely used because of its quick and convenient construction. The main sequence of the construction is: excavate up the steps, install the supporting steel frame (usually a section steel frame or a grille steel frame), and spray concrete. Then excavate the lower steps and inverts, and install the supporting steel frames for the lower steps and inverts. When excavating steps and inverts, the deformation of the supporting steel frame is the greatest. When the geological conditions ar...

AI Technical Summary

Problems solved by technology

[0006] 1. The support is placed directly on the original ground, which cannot provide enough support

If the foundation treatment is carried out on the original ground, it is time-consuming and labor-intensive, taking up precious time

[0007] 2. The contact between the support and the steel frame is not good, and wooden wedges are often used, which cannot guarantee uniform force

[0008] 3. Can not provide prestress

[0009] 4. Single-point support cannot form a stable support system

[0010] 5. Processing and installation are inconvenient

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