JPS59192194A - Underground connection of tunnel in hermetically closed typeshield construction method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to the excavation of Tong-il-lu using the closed shield construction method, and involves stirring and excavating the outer periphery of the underground joint between two facing tunnels using fluid injection, and then solidifying the excavation. In the method of water stoppage and earth retention by injecting improved soil such as a chemical agent, the ends of mutual jet pipes from inside the shield machine are inserted diagonally so that they reach the outside of the shield machine facing each other. 91il outside of the Lord's office
The objective is to ensure that the soil in contact with the excavation area is stirred and excavated.

When performing underground joints in a tunnel excavation method using a sealed shield machine, for example, first the soil quality is improved at the joint point by chemical injection or freezing method, then the shield machine is propelled, and then both shield machines are joined together. However, in the case of the chemical injection method, the injected chemical does not permeate into the ground evenly because the surrounding soil texture is not uniform, so it can be applied over a wider area than necessary. Moreover, it has the disadvantage that it requires a lot of effort and cost to improve the soil quality, such as the need to inject a large amount of soil.

In order to eliminate such drawbacks, the present inventor first provided a jet pipe insertion hole C around the sunken partition wall 13 in the front part of the shield machine body A, as shown in FIG. We have developed a construction method in which the shet pipe D is cut out and then pressured water is injected from the outside of the shield machine to jet excavate the area around it.
In this construction method, the injection means of pressurized fluid using the shet pipe in 46 has been improved to more efficiently form earth retention and water stop mass G' to safely perform the joining work, and its implementation will be explained with reference to the drawings. Therefore, in FIG. 17 to FIG. 4, (1) is the main body of the shield machine, and a partition wall (21) is provided at the front part of the main body of the shield machine.
1 supports a rotary I-drawing (4), and a drilling blade 17 is mounted at the tip of the rotating I-drawing (4) through a compartment (5) between the partition wall (2) and the partition wall (2). :!
181] Fix the board [-il, and turn this rotation axis (4)
is rotated by a motor (7). The partition wall (2) is provided with an equal number of holes (8) 11 (for inserting the jet pipes ':i, Q; When the machine advances to 4111, it is closed with a lid body (91) that has a length of 1 m.In the compartment (5) between the bulkhead (21) and the excavation plate (6), a sludge pump 1111 is installed. This is the reverse of the mud feeding W (continuing with III).

To explain the tunnel excavation and joining method using the shield machine configured as described above, first, cover bodies (9) are applied to six holes (8) with gaps (2), While rotating the shield machine]; While rotating the shield machine, the sludge excavated by υ11 is discharged to the rear through the mud pipe (111) by the mud removal pump (river).In this way, both shield machines +11,
(After 11 reaches near the predetermined joining position, a suitable solidifying agent (121) is filled and solidified into the compartment (51) using a slurry pipe. Next, the lid ( 91, insert a hole drill into this hole i8i, and follow the hard, deep, deep (12) and bend (6) holes in the compartment (5) to the opposite shield machine (1). ) is drilled diagonally outward (I3) toward the outside end 111n of the hole (I!4), and the lid body I!4) is re-drilled.This operation is performed for all holes (8).Next, this hole +81 is drilled diagonally outward. 2 lids (remove 91 and drill 0 holes from this)
3) to j+i+, attach the valve ([41 to 111η) and install the sludge drain pipe (15), remove the mounting body (!) of the hole (8) near this sludge drain WUS+, and drill hole 1 from this.
1: Insert the jet vibrator (00) through the ED and set its tip to reach the ψ1h1 outside 1H1b of the opposing seal toy as shown in the figure] 14 Eject 1 body and jet 1λ+ around it! ril' L na j, p et al 1 non mud suga 1 j 5 f?
! - Excavated soil is discharged with a chi. The valve (1□
Close the li and fill the nitrogen cavity created by the excavation by injecting liquid, mortar, or other suitable solidified alloy (+71) from the shet pipe (l [il or another pipe replaced with this). This work is performed sequentially for each name plate (81) to form an indestructible earth retaining and water-stopping annular band using a solidifying agent. Insert the tap into which the hardening agent will be injected.
From 4I11 people and beyond ☆;1. (shield (ji1)
ノ [(のzo'+:li outside jllll In order to make it protrude to the A part, stir i by the reflux of the body after one injection from the inside)
ia! t;IJL Q(t)A portion can also be directly cut by wet cutting, and it can also be completely filled with a solidifying agent. In this way, the shield machine Mtll,il
After carrying out earth retaining and water stop work around the outer periphery of the joint of 1, remove the partitions ff1tz+ and +21 in both shield machines and remove the surrounding binder α in the partition (5). , i cutting f::r +6+ and earth and sand between both shield machines will be removed to connect both tunnels.

As mentioned above, according to the construction method of the present invention, the shield of both the prefectures (Tora 1 and 1) where the tunnel is built (υp FroJ[
Earth retaining around the outer periphery of joint 1 and 7, ring shape for water stop; y
1. i; by ejecting the jet fluid from the jet vibrator from inside to the outside of the opposing shield machine (1i1j) to both shields ↑'
Not only was the excavation carried out over the entire area over 11 meters outside the 9 machines, but also the subsequent injection of a solidifying agent was sufficiently spread to ensure earth retaining and water supply effects, making the work of 1 x 1 square meter safe. There are other effect features of +11, such as being able to do things.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the shield machine used in the construction method of the present invention. IUli 1fTI diagram, FIG. 2 is a front view taken along the line X-X′ in FIG. 1, FIG. 51/1 is an explanatory diagram of the construction method of Improvement-1j. (1) Φ shield (receptacle body, (21-・cooking, i wall, 131...1?111ki', +41...time 1 master')
P+U + (51... compartment, (h)..." AP grinding machine,
(7I...Motor, (Exit e/hole, (!-B...Lid body. 1111i...First, mud pump, (Group...Before mud feeding + 11
21・Φ solidification, (+31・+I open hole (141・fist valve + It!+!・・Jzu1. former pipe. Iflit・・jet pipe, +rn・・solidification agent. !rJ permission r °d person Maeda Construction Co., Ltd. /
Rozo”!・Large Z l"l Large 31 Koya 4)]

Claims (1)

[Claims] (11. When excavating a tunnel using a sealed shield machine, at a position close to the joint between both tunnels, a jet vibrator inserted from inside the shield machine through the partition wall uses a fluid jet to scrape and till the earth and sand around the outer periphery of the joint position. After injecting a solidifying agent into this area to form a linear band of unsulfuric properties, the bulkhead, U+ is excavated, earth and sand are removed, and the two are joined together through the shell.In this construction method, a shield facing the jet nob is used.・For the eaves-closed shield method, which is characterized by inserting each shell at an angle so as to reach outside the edge of the machine and removing mud while stirring or jet excavating. Underground connection method for 6-car tunnel.