JP3874618B2 - Simultaneous expansion shield method and its equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a simultaneous enlargement shield method and an apparatus for excavation by enlarging a section of a partial section.
[0002]
[Prior art]
In the shield tunnel, there is a case where the cross section is enlarged only partially, such as a branch connection of a private company. For example, when connecting cables from the orthogonal direction in a common groove, an enlarged portion is required as a space for bending the cable R, or when an auxiliary equipment room is provided in a subway or an underground highway, etc. Requires an enlarged section.
[0003]
In such a case, if the work is performed while occupying the ground part, the enlarged part can be formed relatively easily. However, since it is difficult to occupy the ground part for a long period of time recently, the ground part is not used. Construction from the inside is desired. Underground tunnel excavation work is usually carried out by the shield method, and for excavation of the enlarged portion, the enlarged shield method and NATM method in which the segment of the enlarged portion once assembled after the shield tunnel is built with a standard diameter cross section is removed. Etc. are used.
[0004]
However, the conventional expansion shield method and the NATM method in which the excavation work by the shield machine and the excavation work of the enlarged portion are separately performed as described above have problems such as inefficiency, long work period, and high cost. there were.
In view of the above problems, the present applicant has proposed a propulsion method in which Japanese Patent Application No. 2000-345116 simultaneously constructs the standard diameter and the enlarged portion.
[0005]
The above proposal is a technology that can solve the problems of the conventional technology and achieve a satisfactory result. However, it is possible to develop a technology that can be constructed more efficiently and economically by subsequent research and improvement. done.
[0006]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a shield method and apparatus capable of efficiently performing simultaneous excavation of a standard diameter shield and an enlarged portion.
[0007]
[Means for Solving the Problems]
According to the present invention, in the simultaneous enlargement shield method in which a section of a section is enlarged and excavated, the excavation is performed by releasing a part of a plurality of standard segments 2 excavated and installed by the standard diameter shield machine 1. The bulkhead part 4b of the blade body 4 is connected to the standard segment 2 in front of the unframed open part, and the propulsion jack 6 for simultaneous propulsion is connected to the rear of the bulkhead part 4b at a position corresponding to the standard diameter. The shelter 3 is provided inside the skin plate portion 4a so as to be slidable through the tail seal 5, and the shelter 3 is connected to the standard segment 2 at the rear of the unframed opening portion. 4 and the standard-diameter shield machine 11 are simultaneously propelled by a predetermined amount, and the enlarged segment 10 is assembled inside the skin plate 4a in the enlarged space between the advanced blade body 4 and the shelter 3. See, as a repeating process, by setting the thrust transmission member 7 between the propulsion jacks 6 and shelters 3, drilling, simultaneous promotion, repeat segments built construction.
[0008]
Further, according to the present invention, after passing through the predetermined enlarged section, the standard shield work is applied with the thrust transmission member remaining. Remove the thrust transmission member when the thrust of shield digging is no longer transmitted to the widened part.
[0009]
Further, according to the present invention, a part of the plurality of standard segments 2 excavated and installed by the standard diameter shield machine 1 is removed from the frame, and installed at the site where the enlarged excavation is performed and the tunnel cross section is enlarged and excavated at the same time. In the expansion shield device, the blade body 4 having the skin plate portion 4a and the bulkhead portion 4b at the front thereof, and the shelter 3 slidable through the tail seal 5 inside the skin plate portion 4a are provided. The shelter 3 can be connected to the standard segment 2 at the rear of the de-frame opening part, and the bulkhead part 4b can be connected to the standard segment 2 at the front of the de-frame opening part, and the standard at the rear of the bulk head part 4b. A propulsion jack 6 for simultaneous propulsion is connected at a position corresponding to the diameter, and the propulsion jack 6 is configured to simultaneously propel both the blade edge body 4 and the standard diameter shield machine 11. That.
[0010]
That is, according to the present invention, the tail is excavated by the shield until the tail reaches the expansion start position, the excavation is performed at the predetermined position, the shelter and the blade body are installed, and the front of the blade body is set at a predetermined distance (1). If only the ring part) is excavated, the reaction force is received by the thrust transmission member, the propulsion jack is simultaneously propelled with the standard diameter shield, the enlarged segment is assembled in the blade body, and the standard diameter shield work is returned after the predetermined enlarged section is constructed. Well, it can be constructed efficiently with a slight increase in thrust. The excavation in front of the blade body may be manual excavation.
[0011]
The cross section of the enlarged portion is not limited to a concentric circle, and can be applied to a cross section of an arbitrary shape such as a non-concentric circle, a horseshoe shape, or a rectangle.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a simultaneous expansion shield device according to the present invention, in which a shelter 3 made of steel is installed at an expansion start position of a segment 2 excavated and installed by a shield machine 1 having a standard diameter. This shows a mode in which the excavation starts. Any appropriate method can be adopted to form the enlarged portion. For example, a part of the enlarged portion is removed and the ground is improved by chemical injection or the like if necessary (see below).
[0013]
When a part of the enlarged portion is excavated in this way, a shelter 3 having a channel-shaped cross section is installed at the end thereof. The outer periphery of the shelter 3 is configured to have the same diameter as the segment installed in the enlarged portion. On the outer periphery of the shelter 3, a blade body 4 composed of a skin plate 4a and a bulk head 4b is provided so as to be movable in the front-rear direction via a tail seal 5. Here, reference numeral 20 denotes a shield cutter, 21 denotes a screw conveyor, and 22 denotes a simple work cart.
[0014]
Referring to FIG. 2, a bulkhead 4 b is attached to the standard diameter segment 2 a and a propulsion jack 6 is attached to the rear of the bulkhead 4 b, and thrust is transmitted to the rear standard diameter segment 2 via the thrust transmission member 7. A plurality of (12 in the illustrated example) tuning jacks 11 are arranged inside the skin plate 4 a so that thrust is transmitted to the shelter 3 via the enlarged segment 10. The segment 2a is the first segment when the excavation of the enlarged portion is completed and the standard diameter is restored.
[0015]
The skin plate 4a is connected by a large number (16 in the illustrated example) of reinforcing rib members 9, and is provided with a worker scaffold 16 and an opening 15 in the case of hand drilling excavation. Here, reference numeral 12 denotes a face jack, 13 denotes an operator, and K denotes a face of the enlarged portion.
[0016]
Hereinafter, the process of excavating the enlarged portion will be described.
When reaching the predetermined position for constructing the enlarged portion, referring to FIG. 1, the standard diameter segment 2 is removed from the frame, and the shelter 3 is installed by performing the excavation, and the tail seal of the skin plate 4 a is arranged on the outer periphery of the shelter 3. The blade body 4 is installed so that 5 contacts. In this case, if necessary, the site where the excavation is performed in order to install the shelter 3 is subjected to ground improvement.
[0017]
Next, the first thrust transmission member 7 is installed between the propulsion jack 6 attached to the bulkhead 4 b and the shelter 3, and the enlarged segment 10 and the tuning jack 11 are installed.
[0018]
First, one ring of the enlarged segment 10 is excavated in front of the bulkhead 4b, for example, by hand drilling. Then, the shield machine 1 and the blade body 4 are propelled by one ring of the enlarged segment 10 by the propulsion jack 6 and the tuning jack 11.
[0019]
An enlarged segment is assembled in the blade body 4, and the second thrust transmission member 7 is set between the propulsion jack 6 and the first thrust transmission member 7 (the first and second thrust transmission members are the same). Since the same sign is used, the enlarged portion face K is further excavated by one ring by hand drilling, and the same process is repeated to excavate the enlarged portion.
[0020]
FIG. 3 shows an aspect in which 18 rings of the enlarged segment 10 are assembled by repeating the above steps.
When the final enlarged segment 10 is assembled when the end point of the enlarged portion is reached, the shield can be returned to the standard diameter shield. Thereafter, it is confirmed that the thrust of the shield work is not transmitted to the enlarged portion, and the thrust transmission member 7, the propulsion jack 6, and the tuning jack 11 are removed.
[0021]
As described above, the example using the tuned jack 11 for the enlarged segment has been described. However, if the strength and rigidity of the blade body 4 are sufficient, the tuned jack 11 can be omitted to facilitate work management. I can do it.
[0022]
【The invention's effect】
The present invention is configured as described above, and can exhibit the following excellent effects.
(1) Since the segment of the enlarged section is fixed at the assembly position, backfill injection can be performed firmly for each segment. (2) Widening work can be performed within the shield excavation process, making it easy to grasp the process. (3) If a thrust transmission member for propulsion is standardized, it can be used repeatedly in several enlarged sections and it is economical. (4) Therefore, a shield work with an enlarged section can be efficiently performed in a short construction period and safely.
[Brief description of the drawings]
FIG. 1 is an enlarged section excavator showing an embodiment of the present invention.
FIG. 2 is a rear view of the bulkhead of FIG.
FIG. 3 is a view showing a mode in which an enlarged section is excavated by the enlarged portion excavating apparatus of FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Shield machine 2 ... Standard diameter segment 3 ... Shelter 4 ... Blade body 6 ... Propulsion jack 7 ... Thrust transmission member 9 ... Rib material 10 ... Expansion part segment 11 ... Synchronous jack 15 ... Opening part 16 ... Scaffold K ... Expansion part Face

Claims (2)

In the simultaneous enlargement shield method for excavating a section of a part of the section, excavation with the standard-diameter shield machine (1), removing some of the installed standard segments (2), and expanding the excavation. The bulkhead portion (4b) of the blade body (4) is connected to the standard segment (2) in front of the unframed open portion, and is used for simultaneous propulsion at a position corresponding to the standard diameter behind the bulkhead portion (4b). The propulsion jack (6) is connected, and a shelter (3) is provided inside the skin plate (4a) so as to be slidable via the tail seal (5). Connected to the rear standard segment (2), the propellant jack (6) simultaneously propelled both the blade body (4) and the standard diameter shield machine (11) by a predetermined amount, and the blade body (4) advanced. And in the expanded space between the shelter (3) The expansion segment (10) is incorporated inside the kin plate (4a), and as a repetitive process, the thrust transmission member (7) is set between the propulsion jack (6) and the shelter (3), and excavation, simultaneous propulsion, Simultaneous enlargement shield method characterized by repeated installation of segments. In the simultaneous enlargement shield device that removes a part of a plurality of standard segments (2) excavated and installed by the standard diameter shield machine (1), and installs at the location where the excavation is expanded and expands the tunnel cross section for excavation A blade body (4) having a skin plate part (4a) and a bulkhead part (4b) in front of the skin plate part (4a), and a shelter slidable inside the skin plate part (4a) via a tail seal (5) (3), the shelter (3) is connectable to a standard segment (2) behind the deframed opening part, and the bulkhead part (4b) is a standard segment ( 2), a propulsion jack (6) for simultaneous propulsion is coupled to the rear of the bulkhead portion (4b) at a position corresponding to the standard diameter, and the propeller jack (6) Standard diameter shield (11) Simultaneous expansion shield apparatus characterized by being configured to simultaneously promote both.

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