Earth pressure balance shield machine with freezing function and tool change method thereof

Abstract

The invention discloses an earth pressure balance shield machine with the freezing function and a tool change method thereof. A freezing unit, a storage tank and a heating device are independently arranged or are added to an accessory system behind the earth pressure balance shield machine; freezing circulation pipes are added in a cutter head structure or on the side face of the cutter head structure, or in a shield body or on the side face of the shield body and a machining cavity is formed through the structure of the shield machine so that a circulating freezing system can be formed, and therefore liquid, semi-liquid and solid media within a certain range around the cutter head, an earth warehouse and the shield body can be frozen. Heating pipelines are additionally arranged on a partition plate, high-temperature heat conduction liquid is input into the heating pipelines and the freezing pipelines through the heating device, and therefore a main driving unit and a center rotating connector can be protected and a frozen area can be molten. The earth pressure balance shield machine with the freezing function can avoid the problems that in the maintaining process of the earth pressure balance shield machine, tool changing risk is large, consumed time is long, and expenses are high.

Description

Technical field [0001] The invention relates to a shield machine, in particular to an earth pressure balance shield machine with a freezing function. The invention also relates to a tool changing method of the earth pressure balance shield machine with freezing function. Background technique [0002] The earth pressure balance shield machine is suitable for the excavation of large tunnels in soft soil layers such as sand, silt and clay. Its working principle is to use the earth pressure in the soil bin or the pressure generated by the injection of auxiliary materials to balance the excavation surface Earth pressure and groundwater pressure. Compared with the mud water balance shield, the tools on the face of the earth pressure balance shield and the direct contact between the shield body and the soil layer have greater friction, so the life of the tools and cutter heads will be shorter than that of the mud water shield. It needs to be maintained in a short period of time. Comp...

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Problems solved by technology

Compared with the maintenance of the mud-water shield with pressure entering the warehouse, the maintenance of the cutter head of the earth pressure balance shield machine is generally to drill the cast-in-place pile at 50cm in front of the cutter head, and then open the warehouse under normal pressure for maintenance. During the construction process, this kind of The method will be limited by geographical location and other factors, and the safety and reliability will be low during the construction process; when the soil moisture content is high, in order to avoid the water and soil pressure at the front end of the cutter head face, the artificial soil freezing method will also be used in the maintenance process , this kind of freezing method has problems such as time-consuming, high cost, and large space occupation in practice.

[0003] The currently used tool change methods mainly include normal pressure tool change and pneumatic tool change. The normal pressure tool change needs to be carried out under the condition that the ground self-stabilization ability is good at the stop position of the shield machine, while the pneumatic tool change needs the ground protection at the stop position of the shield machine. Therefore, it will be difficult to replace the shield machine tool when the ground at the stop position of the shield machine cannot meet the prerequisites for the above tool change method.

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