Tool of jacking pipe entering tunnel in foamed soil without need of foundation reinforcement outside pit and construction method thereof

Abstract

The invention discloses a tool of jacking pipe entering tunnel in foamed soil without the need of foundation reinforcement outside a pit and a construction method thereof. A foamed soil cabin-filling tunnel-entering area is arranged in a jacking pipe work well in combination with a building enclosure provided with an machinable body in advance, a double-hoop water stopping unit and a tunnel hole liquid nitrogen ring are internally arranged, and thus a guarantee is achieved; and a jacking pipe safely enters the tunnel through a series of auxiliary measures, for example, steel plates are connected piece by piece to achieve well joint closing. Pipeline moving and road occupying which are needed for a conventional jacking pipe tunnel-entering reinforcement mode are completely avoided, meanwhile, destruction of soil ecological conditions of corresponding regions is avoided, environmental protection is achieved, and the tool and the construction method are particularly suitable for the urban center city area of which underground pipelines are intensive and ground traffic is busy and green areas which have strict ecological protection requirements.

Description

technical field [0001] The invention relates to the technical field of underground passage engineering construction, in particular to a tool for pipe jacking in foam soil without foundation reinforcement outside the pit and a construction method thereof. Background technique [0002] In recent years, with the rapid development of urban development and construction, in large and medium-sized cities with developed economy and heavy traffic, in order to improve regional traffic functions and humanized travel needs, such as pedestrian crossing passages, subway transfer passages, underground garages The construction of various types of underground passages such as connecting passages and commercial underground corridors is in full swing. Since the proposed construction sites of such underground passages are generally located in central urban areas, if the open-cut method is used to construct, it often requires long-term occupation of roads, a large amount of relocation of pipelin...

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Problems solved by technology

Among them, the freezing method is not only expensive, but also under the action of freezing and thawing, the soil will undergo large uplift and settlement changes, which may easily cause safety hazards to adjacent pipelines; cement-based reinforcement such as cement-soil mixing piles and high-pressure jet grouting piles is generally ground-down During the construction period, it is necessary to occupy the ground road and relocate the pipelines in the reinforcement area; at the same time, both of them will completely destroy the ecological conditions of the original soil, and neither can be applied to the green protection area that must maintain the living conditions of plants during the construction period (such as ancient tree and famous tree area), therefore, there are relatively large limitations in application

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