JPS58222292A - Drilling of branched tunnel - 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 The present invention relates to a construction method for excavating a branch toshinel from inside a toshinel lined with t-dimesite.

Normally, Toshinel constructed using the shield method is used for sewers, power and communication wiring pits, subways, etc.

Such toshinels are formed by excavating earth and sand using the shield method and lining the excavated wall with cosiclete or steel setameshite. If it is necessary to split the branch, in the conventional shield construction method, after excavating the toshinel, a vertical shaft is excavated from the ground L and the necessary branching toshinel is constructed.

However, in recent years, it has become extremely difficult to acquire land and carry out construction work for the aforementioned shafts due to deteriorating road conditions, absolute land shortages, and growing local residents' interest in environmental conservation.

The present invention was developed in view of these problems, and provides a branch tunnel excavation method for constructing a desired branch tunnel from inside the tunnel without excavating a vertical shaft from the ground.

To explain the embodiment of the present invention with reference to the drawings, (1) is a commonly used cosiclete or steel segment, and (2) is a tunnel formed by excavating the ground (2) with a shield machine. 3) is covered.

(4) is a short cylindrical pit roller, one end of which is open end face is formed into a circular plane, and the other end open end face is formed into a convex arc-shaped curved end face from the upper and lower end faces toward both end faces; This curved end surface is brought into contact with a predetermined segment (1a) on the inner surface side of one side wall of the tunnel (3) in the segment (1) assembled as a tunnel lining, and the mine roller (4) is attached to the segment (1a). ) Welded or bolted to water: 1 □ 11 tightly fixed.

(5) is a lip fixed to the outer periphery of the open end of one end of the mining rod (4). Fix with bolts (8), and attach the rose +''7 (6) to the mine roller (
4) is protruded toward the open end side.

(9) is within the tunnel (3).
This is a shield machine installed in the direction perpendicular to the length direction of the spinner plate, and a partition wall q is provided at the front of the spindle plate CLQ, and a rotating shaft o' supported at the center of the partition A cutter α4 is attached to the tip of the rotating shaft Q4.
The water is rotated by a drive shaft located behind the bulkhead, and the slurry is sent from the rear side of the bulkhead to the mud chamber formed between the bulkhead αυ and the back of the cutter, and the slurry is drained into the mud drain pipe (t). This shield machine (9)
A branch tunnel of a desired cross section is excavated toward the mine lolisita (4).

(G) is a propulsion shirt installed at appropriate intervals in the circumferential direction on the inner circumferential surface of the S+SHI-TO curve of the Sea 418 machine (9), and extends its O・νF toward the rear. It is like that.
,,.

0 Old Masu + Shizu Rate (L

The shield is a reaction force receiver attached to the segment [1b] on the other side wall of the tunnel facing the mine lorisig (4), and the shield machine (
9) is received through the reaction force frame 1) t-.

Although this reaction force frame Qυ was temporarily assembled using a setamate for forming a limb tunnel, it may be made of other materials as long as it transmits reaction force.

(2) is a girder bridged between both side walls at the bottom of the tunnel in the lower part of the shield machine (9), and (e) is a girder that spans several girders (2
), which supports the shield machine (9) and the reaction force frame I2v.

Next, we will discuss the construction method of Branch Toshinel. 1. First, a tunnel (3) is excavated in the ground (2) using the normal construction method, and the tunnel (3) is lined with segments (1). Next, the branch tunnel Segment of planned excavation area (1a)
The bolt (4), which has an inner diameter slightly larger than the outer diameter of the branch tunnel, is securely attached to the inner peripheral wall of the branch tunnel. ) to fix it.

In this way, after installing the mine lolisi (4), the mine lolisi (4) is
) Place a girder at the bottom of the tunnel where the girder is located, place a pedestal on the girder, place the seal F (9) on the pedestal, place the seal F (9) on the bottom of the tunnel, and place the bulkhead inside. Assemble qη, cutter (to), propulsion jaw + (to), etc.

Furthermore, the segment (1b
◎ Form a reaction force receiver on the inner wall of ) using Kosikret Temple, and assemble the T Tamesito for branch lining between this reaction force receiver (E) and the shield machine (9) to form a reaction force frame Qυ◎ The center of the reaction frame Qυ, the center of the shield machine (9) and the mine roll (
4) is arranged so that its center is approximately on a straight line and its direction is in the direction of the split string to be excavated.

Now, if you extend the propulsion shirtman (G), the shield machine (9
) moves forward by the reaction force of the reaction force receiver (E) through the reaction frame (C), and slides the loose center (6) of the mine roller (4) onto the outer circumferential surface of the S+shib plate 4 and moves forward. It spreads out and reaches the inner wall of segment (1a).

Next, drive f-5 (b) is activated to rotate the filter (b), and the muddy water is sent to the muddy water chamber (g) through the mud feeding pipe (6). When the propulsion jaw + (g) is further extended while feeding and discharging mud by the mud removal pipe αη and circulating the mud water, the shield machine (9) gradually cuts the segment (1a) with the cutter (to). It moves forward and finally penetrates segment (1a). The cut pieces are discharged outside the mine by flowing muddy water.

In addition, when the segment (1a) is made of steel, a desired opening is formed in advance by gas cutting 11T% before the shield machine (9) moves forward.

Propulsion: When the middle (g) extends by one stroke, shorten the 0-d and assemble the t-gumeshito for the branch toshinel in the shield machine. After that, a reaction force is applied to the segment (c) to extend the propulsion gear again, and the shield machine (9) is advanced to excavate the ground as shown in Figure 4. Tsu 1: shorten and branch toshinel t tameshito? /, by assembling the parts and repeating this operation one after another to form the desired part 1 cinere. :.

In addition, when excavating soft ground using a method other than the muddy method, strengthen it by injecting T-Meshito, etc. from inside the Toshinel (3) to the vicinity of the anti-slip area, and if there is a lot of groundwater, further pressurize the inside of the shield machine. It is desirable to excavate while doing so.

In the above embodiment, a case was described in which a branched toshinel was formed while assembling segments, but instead of using segments, a propulsion mechanism such as =:T1-t+ was used instead of using a ready-made lining material such as neem pipe. A branch tunnel may be excavated using a method in which a reaction frame with a shield machine is used to propel the tunnel along with a shield machine.

In addition, if the shield machine (9) is too long to be installed in the Toshinel (3) facing the specified direction, the Toshinel wall facing the branch Toshinel tunnel entrance (4) should be expanded in advance, as shown in Figure 6. It is also possible to set the shield machine (9) in the tunnel having the widened part (goods), and to excavate the branched toshinel using the segment forming the widened part (11) as a reaction force receiver.

Furthermore, on the contrary, the toshinelsejimeshito facing the widened part (2): ('Z shown in FIG. 7 with υ as a reaction force receiver.

The shield machine (9) may be propelled in this manner.

In addition, in the above embodiments, transport was carried out by excavation using mud water circulation, but transport by trolley may also be used.As mentioned above, the present invention provides for the inner surface of the side wall of the toshinel lined with segments.
After installing a mine roller equipped with an annular cross on the periphery of one end in a water-tight manner, a part of the tip cutter of a shield machine disposed inside the shell is inserted into the mine roller, and the side wall of the shell facing the mine roller is fitted. Since this relates to the branched toshinel excavation method, which is characterized in that a shield machine is excavated using the segment as a reaction force receiver, it is possible to excavate a desired branched toshinel from inside the toshinel without excavating a vertical shaft from the ground. Therefore, problems such as acquiring land for a shaft can be completely resolved, and since no shaft is used, the toshinel can be branched from any part within the toshinel, and its construction can also be done by moving the shaft along the toshinel. This can be done easily and accurately by attaching it to the inner surface of one side wall and then moving the shield machine forward using the segments on the other side wall as reaction force receivers.

In addition, if a widening part is formed in the toshinel part where the branch toshinel is to be formed, the inside of the mine will become wider and the work can be carried out smoothly, and the propulsion 5st FR equipment of the shield machine can be used without the need for a special koshibakuto. be.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG.
The figure is a side view of the inner wall of Toshinel equipped with mine rolls, No. 6.
The figure is a vertical front view of the same, Figure 4 is a simplified vertical front view of the state in which the branched toshinel is being excavated, and Figure 5. The figure is a sectional view taken along the line A in FIG. 4, and FIGS. 6 and 7 are simplified longitudinal sectional front views showing a state in which a shielding device is disposed in the Toshinel expansion 11 section. (1) (la) (lb)---t, (2)
--1 ground, (31---) Shinel, (4) --1 hole lolishita, <6) --1 batch, (9) --- shield machine, (b)-m-cutter 1 Kan---reaction force receiver, (
c) -m-reaction force frame. Patent tOBm person Okumura group Co., Ltd.; 5...no 2
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Claims (1)

[Scope of Claims] ■ A tip cutter of a shield machine installed inside the toshinel after water-tightly attaching a shaft with an annular barad on the periphery of one end to the inner surface of the side wall of the toshinel lined with T-gumeshito. A method for excavating a shunter toshineru, characterized in that a part thereof is inserted into the forehole, and a shield machine is made to excavate by using a setameshite on a side wall of the toshineru facing the forehole as a reaction force receiver. (1) The shielding machine is made to dig by widening the side wall of the shield on the side opposite to the setaming hole on which the mine shaft is attached, and using the widening portion of the wall as a reaction force receiver to allow the shield machine to dig. The branch Toshinel excavation method. ■ A patent characterized in that a widened part is provided at an appropriate position on the side wall of the Toshinel, and the shield @ installed on the widened part is made to dig into the shield @ of the other side wall of the Toshinel, which is opposite to the expanded part 11, as a reaction force receiver. The branch toshinel excavation method according to claim 1.