Construction method for shield driving type empty pushing ground fracture bored tunnel

Abstract

The invention discloses a construction method for a shield driving type empty pushing ground fracture bored tunnel. The construction method comprises the following steps: 1) constructing a concrete guide platform in the ground fracture bored tunnel; 2) constructing a guide rail and a counterforce frame; 3) integrally forward pushing the shield tunneling machine: forward pushing the shield tunneling machine, supporting the shield tunneling machine on two guide rails, and utilizing a boosting cylinder of the shield tunneling machine and the counterforce frame to integrally forward push till being in place; in a pushing process, utilizing a shield segment assembling device for the shield tunneling machine to mount a plurality of shield segments on the concrete guide platform from back to front, wherein the shield segments are bottom segments and are located on the rear side of the boosting cylinder; supporting the boosting cylinder on the counterforce frame through the bottom segments, wherein the bottom segments form a trolley translation channel for forward moving the rear matched trolley of the shield tunneling machine. The method provided by the invention has the advantages that the steps are simple, the design is reasonable, the construction is simple and convenient, the use effect is good, the inverted arch backfill structure in the tunnel is utilized to simply and conveniently finish the construction process of the shield driving type empty pushing ground fracture bored tunnel and the construction process is safe.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to a construction method of a shield excavation-type empty-push tunnel through ground fissures. Background technique [0002] Empty thrusting of the shield means that the shield machine moves forward without excavation after the commissioning of the shield machine is completed. When shield tunneling through ground fissures is started and arrived at the construction, brackets made of section steel are usually used to receive and start the shield machine into and out of the hole. The ground fissures tunnel refers to the underground Dig tunnels. Shield excavation tunnels through ground fissures usually adopt the construction method of disassembling the shield machine body and supporting trolleys and moving them separately. The shield machine body and the steel bracket are integrally pushed by jacks to excavate through ground fissures. In the tunnel, the...

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Problems solved by technology

The above-mentioned construction method mainly has the following defects: first, the weight of the section steel bracket and the starting reaction force frame is relatively large, and the hoisting, transportation and disassembly of the components are extremely inconvenient due to the space limitation of the underground excavation tunnel and the influence of vertical and horizontal transportation; 2. The reaction point of the shield digging the tunnel through the ground fissure is frequently changed, which seriously affects the transit time; moreover, it is necessary to set up the reaction fulcrum of the jack every 6 meters to 9 meters, and there are many fulcrums to be set. Due to the dual constraints of small curve radius and narrow space of underground excavation tunnels with ground fissures, the construction is difficult, safety risks are high, the cycle is long and the cost is high; It is extremely low, and the construction period for the reassembly of the shield machine body and the supporting trolley after passing the station separately is longer, the cost increases, and the construction period and economic cost are greatly increased; Fourth, there are many unsafe factors, and safety management is difficult. Moreover, due to the self-heavy weight of the steel bracket and the starting reaction frame, the space of the ground fissure underground excavation tunnel is small, and it is difficult to hoist, transport and disassemble in the tunnel and the safety risk is great; install the steel bracket in the ground fissure underground excavation tunnel Due to the influence of the small space, the positioning of the steel bracket is difficult, the error is large, and the reinforcement is not firm, which is prone to problems

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