Mechanized construction method of large underground spent fuel disposal repositories

A construction method and technology for spent fuel, applied in underground chambers, earthwork drilling, shaft equipment, etc., can solve the problems of low level of mechanized construction, long construction time, low utilization rate of underground space, etc., and achieve the effect of high flexibility

Active Publication Date: 2019-07-12
CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems of the existing underground spent fuel repository, such as long construction time, low mechanized construction level, and low utilization rate of underground space, the present invention proposes a mechanized construction method for underground spent fuel repository

Method used

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  • Mechanized construction method of large underground spent fuel disposal repositories
  • Mechanized construction method of large underground spent fuel disposal repositories
  • Mechanized construction method of large underground spent fuel disposal repositories

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: as figure 1 As shown, a large-scale underground spent fuel repository mechanized construction method includes the following steps:

[0035] S1, first carry out shaft 1 construction, and use shaft drilling rigs or mechanical + blasting excavation to construct the shaft until the design depth is reached. For the case where a multi-layer repository needs to be built, several holes are reserved around the shaft 1 on each floor;

[0036] S2, such as figure 2 and image 3 As shown, the construction of the outer ring 2 is carried out subsequently, and a temporary platform is built on the holes reserved around the shaft 1. The starting end and the receiving end of the main shield machine are set in the shaft 1, and the starting end of the main shield machine The launching direction is perpendicular to the receiving direction of the receiving end of the main shield machine. Hoist the main shield machine from the ground to the temporary platform, adjust the posit...

Embodiment 2

[0043] Embodiment 2: A mechanized construction method for a large-scale underground spent fuel repository. The small shield machine is perpendicular to the starting straight section of the outer ring 2 and the receiving straight section of the outer ring 2, that is, the small shield machine has been specially designed, both It can meet the small radius turning, and can also meet the straight line section perpendicular to the outer ring starting line and the receiving line section of the outer ring. The starting and receiving of the small shield machine in a narrow space is convenient for the small shield machine to excavate the inner ring.

[0044] All the other structures and construction methods are the same as in Embodiment 1.

Embodiment 3

[0045] Embodiment 3: The mechanized construction method of a large-scale underground spent fuel repository. In the step S4, a small shield machine is hoisted into the outer ring 2 of the repository on both sides to excavate the inner ring 3, and the tunneling construction is carried out at the same time, which greatly improves Overall work efficiency and shorter construction period.

[0046] All the other structures and construction methods are the same as in Embodiment 1.

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Abstract

The invention provides a mechanized construction method of large underground spent fuel disposal repositories. The mechanized construction method comprises the following steps that S1, firstly, shaftconstruction is carried out; S2, outer ring construction is then carried out; S3, after the construction of an outer ring on one side of a shaft is completed, a main shield machine penetrates throughthe shaft and repeats the construction of an outer ring on the other side of the shaft in the step S2; S4, an inner ring inside the outer ring is then constructed; S5, the step S2, S3 and S4 are repeated, and the construction of the fuel disposal repositories of adjacent layers is completed; and S6, finally, an elevator is built with a hole as a supporting point. According to the mechanized construction method, multi-layer excavation of a lower space can be realized through one shaft, and the shaft is not only the starting shaft but also the receiving shaft of the shield machine, so that the construction cost is saved; and the special outer ring and inner ring circuit design of the multi-layer disposal repositories is beneficial to the shield machine to fully develop the underground spacein time-saving and efficient way, safely and environmentally friendly manners.

Description

technical field [0001] The invention relates to the technical field of underground storage of spent fuel, in particular to a mechanized construction method of a large underground spent fuel repository. Background technique [0002] Spent fuel is nuclear fuel that has been exposed to radiation and used. It is usually produced by nuclear reactors in nuclear power plants. Because of its high radioactivity, radiation hazards, and high heat release, it is more stringent than general waste disposal. At present, the technology for the treatment of low- and medium-level radioactive nuclear waste is relatively mature, but for high-level radioactive nuclear waste, because it contains extremely toxic and long-lived radionuclides, its safe disposal is more complicated and difficult. In view of this, some people have proposed various schemes such as "space disposal", "deep trench disposal", "ice sheet disposal", and "rock melting disposal". After years of research and practice, the curr...

Claims

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Application Information

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IPC IPC(8): E21D13/02E21D1/00
CPCE21D1/00E21D13/00
Inventor 毕程程高毅于少辉李洋程鹏罗雨田苏明浩李鹏王宁冯超元罗长明李应飞
Owner CHINA RAILWAY ENGINEERING EQUIPMENT GROUP CO LTD
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