The shield launching and receiving is one of
difficulties for large crosssection horseshoeshaped shield tunnel construction. In this paper, the key
construction technologies of shield launching and receiving of large crosssection horseshoeshaped shield used in
Baicheng Tunnel on Menghua Railway are studied and summarized. The key
technologies adopted include: (1) In the shield launching stage, the cost of
reaction frame production and dismantling and the amount of original negative
ring pipe can be reduced by replacing traditional shield reaction frames by
strengthened open hole, which helps to shorten the construction time and save
the cost. (2) The bottom of launching base is evenly laid with bean gravel to
reduce the backfilling time of hollow between launching guide hole and pipe
after the shield enters undisturbed soil. (3) In shield launching stage, the
arch steel frame is innovatively adopted to replace the traditional launching
endwall structure, which reduces the construction amount of launching ancillary
facilities and shortens launching preparation time. (4) In receiving stage, the
base is combined with the endwall to reduce the security risk of the shield
machine receiving in the weak stratum. (5) The launching and receiving
positions of shield are optimized to make full use of the main operation
surface of shield tunneling and open tunnel without interfering with each
other, which would realize better economic and safety benefits.
ZHANG Longguan
,
LI Zhigang
,
TAN Jiang
.
Launching and Receiving Technology of Large Crosssection Horseshoeshaped
Shield Used in Baicheng Tunnel
[J]. Tunnel Construction, 2020
, 40(7)
: 1041
-1048
.
DOI: 10.3973/j.issn.2096-4498.2020.07.014
