JP2823020B2 - Deformed double circular underground drilling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a multi-circle underground excavation in which a multi-sectioned cross-section hole having different diameters and independent multi-circle holes can be excavated as required. About the method.

(Conventional technology) Conventionally, tunnels manufactured by the shield method are often single-line circular ones, and the size of the tunnel cross section generally does not change from the shaft at which the shield work starts to the shaft at which the shield work ends. In order to change the size of the tunnel section to be built, a new shaft had to be constructed and excavation had to be performed using shield devices of different sizes.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 59-48595, there is a method of changing the diameter of a pipe constructed by a shield method to an appropriate size without requiring a new shaft. .

(Problems to be Solved by the Invention) However, even in this method, it is possible to construct a single-line circular tunnel cross section having different diameters, but the tunnel alignment changes from a main line to a branch line, and a cross-section changes from a single line to a double line. Has a problem that a new shaft must be constructed, the work is complicated, and the cost is high.

Also, in recent years, land prices have risen abnormally, and there is no vacant land space, and it is becoming extremely difficult to build buildings on the ground. Effective use of underground spaces is being actively explored.

However, excavating underground requires a great deal of labor, time, expense, and the like. Under such circumstances, multiple sections can be obtained at once. Is attracting attention.

However, in the conventional method, it is possible to obtain only a multiple cross-section of the same cross-section, and there is no one that can be separated into unit cross-sections without constructing any vertical shaft on the way, or that the separated one can be changed course, and the application is extremely small. There was a problem that it was narrow.

The present invention has been proposed in view of the above, and it is an object of the present invention to be able to construct a plurality of circular tunnels independent of a multiple section at a predetermined position without newly constructing a shaft. It is an object of the present invention to provide a method for excavating a deformed circular underground.

(Means for Solving the Problems) According to the present invention, a tunnel having a multiple cross section is excavated to a predetermined position by one multiple underground excavator, and the plurality of tunnels are constructed without constructing a shaft at a predetermined point. The cutter wing of the underground excavator is reduced, and a multiple partition is provided in the shield cylinder of the multiple underground excavator, and the multiple partition becomes a partition of the reduced shield machine. A plurality of partition portions that can slide forward are provided, and a shield member that extends rearward and that functions as a part of a shield tube is provided on the outer peripheral portion of each partition portion, and is then reduced to start. Assembling each hood portion of the plurality of shield machines in front of the shield member, providing a shield hull portion behind the shield member, providing a propulsion jack inside the shield hull portion, Then, the bulkhead is slid forward and separated, and a plurality of tunnels having an independent circular cross section are continuously excavated from the predetermined point, and a plurality of tunnels having an independent circular cross section and a plurality of tunnels having an independent circular cross section can be almost simultaneously excavated. This achieves the above object.

(Operation) At the predetermined point, the outermost shield tube is removed, the outer diameter of the cutter spoke is reduced, and the built-in shield member is used to form one multiple underground. A plurality of independent underground drilling rigs having a small diameter from the drilling rig are configured, whereby a plurality of tunnels can be constructed.

(Embodiment) FIGS. 1 (a) and 1 (b) are plan views of a tunnel constructed by a method of excavating a compound double circle underground according to an embodiment of the present invention.
In the present invention, excavation is performed from the right side to the left side in the figure as shown by an arrow α, for example, at a predetermined position a of the central tunnel line in the figure,
The tunnel can be continuously changed from a single cross section to a plurality of cross sections without newly constructing a shaft, and a tunnel can be continuously constructed while changing a course at a position b if necessary.

FIGS. 2 (a), (b) and FIG. 3 show an embodiment of a modified double-circle underground excavator according to the present invention. S
It has become. That is, in the figure, reference numeral 1 denotes a multiple shield tube, and there are cutter devices 2a and 2b rotatably provided in front of the shield tube 1. Each of the cutter devices 2a, 2b is disposed at a substantially central portion of a respective circle, and a tip bit 3a, 3b is provided at a tip portion, and rotating shafts 4a, 4b rotatable by individual drive systems, A plurality of cutter wings 5a, 5b whose bases on the outer circumferences of the rotating shafts 4a, 4b are fixed and whose distal ends extend radially are provided so as to form a pair at predetermined positions of the cutter wings 5a, 5b, respectively. Cutter bits 6a, 6b, and mixing blades 7a, 7b provided behind the cutter wings 5a, 5b.

In this multiple circular section sealed mechanical shield machine S, a multiple-partition partition 11 having, for example, an eyeglass shape is located inside the shield tube 1 as shown in FIG.
The multi-partitioned partition wall 11 and the circular partition wall parts 12a and 12b provided in each of the unit cross sections forming a circle inside are usually integrally formed when excavating, but are separated as a single circular shield. At this time, the partition portions 12a and 12b are provided so as to be slidable forward, and the remaining multiple partition 11 is left at that location. Each partition part 12a, 12b serves as a partition of a reduced shield machine to be started next, and a shield member 1A which extends rearward and functions as a part of a shield cylinder is provided on an outer peripheral part thereof. Have been.

Reference numerals 13a and 13b denote cutter driving devices for driving the cutter devices 2a and 2b, which are constituted by cutter driving motors 14a and 14b and rotation transmission mechanisms 15a and 15b including gear mechanisms and the like.

16a, 16b is a mud soil material inlet provided at the tip of the rotating shafts 4a, 4b, 17a, 17b is a screw conveyor connected below the partition 12a, 12b, this screw conveyor 17a, 17b
The outer cylinder 19a, 19b provided with a discharge port 18a, 18b at the rear end, and screws 20a, 20b rotatably provided inside thereof,
The motors 21a and 21b rotate the screws 20a and 20b.

Reference numeral 22 denotes a segment of a multi-section section which is successively added, and reference numeral 23 denotes a digging jack for digging the shield machine S.

Thus, in order to construct a tunnel using the multiple circular section sealing machine shield machine S, first, the cutter devices 2a, 2b
Is driven by the driving devices 13a and 13b to excavate the ground, the excavated earth and sand is taken into the mud soil chamber 24, and the earth and sand are injected into the mud soil chamber 24 from the mud material injection pipes 25a and 25b. For example, bed materials such as bednite, CMC, foaming agent and the like are kneaded by the rotation of the mixing blades 7a and 7b of the cutter devices 2a and 2b to form mud having plastic fluidity and impermeability. Mud is made mud chamber 24 and outer cylinder 1 of screw conveyor 17a, 17b
When the inside of 9a, 19b is filled, for example, the propulsion jack 23 is extended to apply pressure to the mud, and excavation work is performed while pressing the face by the mud pressure to prevent collapse. The pressure is measured by the pressure gauges 26a, 26
b), and according to the detection, the screw conveyor 17
By rotating the screws 20a, 20b of the a, 17b by the motors 21a, 21b, the mud is discharged from the discharging ports 18a, 18b to the outside, and the mud pressure is always kept constant in the mud making chamber 24. .

Then, in this way, as shown in FIG. 3, excavation is performed to a predetermined position where ground improvement has been performed in advance according to the shield cross section. When the shield machine reaches the reaching point ground improvement section A, the mud in the mud making chamber 24 is removed, a working space is secured in the face portion, and the cutter wings 5a and 5b are cut, for example, according to the next cross section. Reduce and remodel. Since the cutter wings 5a and 5b themselves are reduced in this way, the ground at the outermost peripheral portions of the cutter wings 5a and 5b can be reliably excavated before and after separation as a single circular shield. Then, the hood portions 27a and 27b of the shield machine to be started next are assembled in front of the outer periphery of the shield members 1A and 1B. Then, the shield hull portions 28a and 28b functioning as the shield cylinder of the shield machine that restarts are connected to the shield members 1A and 1B.
Of the propulsion jacks 29a, 29
b, attach an erector, etc., not shown, assemble the joint segments 33 connecting the arc segments 31a, 31b and the multiple section segment 22 in preparation for the restart, and restart as shown by the imaginary line. When the excavator is excavated, a plurality of circular tunnels having different diameters can be obtained. Further, the course of each excavator can be changed as required, and can be used for various purposes.

Note that the present invention can be applied not only to a horizontal shaft but also to a vertical shaft, and it is needless to say that only a normal multiple underground excavator can be used.

Further, in the embodiment, the example of the method of excavating by obtaining two independent underground excavators from the double-type underground excavator has been described. , N devices and can be drilled.

Further, when a plurality of circular sections each having a slightly smaller diameter are formed inside the multiple-section shield tube, unlike the above-described embodiment, the configured circular cross-section shields include the hood portions 27a and 27b and the shield hulls 28a and 28b. The seal jack can be attached from the beginning to function as the multiple-section shield S.

In this case, since the initial outer diameter of the shield and the outer diameter of the circular shield of the next section are slightly different, the shield cutter wing can be replaced with the original shield S by using a copy cutter.
This is preferable because the work of separating all the shields in the machine can be completed.

Further, it goes without saying that the present invention is applied not only to the mud pressure shield but also to an open mechanical shield, a muddy water shield and the like.

(Effect of the Invention) As described above, according to the present invention, in each unit cross-sectional portion of the shield tube having the multiple cross section, the shield cylinder having the different diameter from the shield tube having the multiple cross section and being substantially independent of each other. In order to use a shield member or a method with a shield that can constitute a circular shield cylinder, at a predetermined position, configure a plurality of underground excavation shields, without constructing a new shaft, A plurality of shield tunnels independent of the tunnel can be continuously formed, which has the effect of expanding the applications.

In addition, since the outer diameter of the cutter spokes provided in front of the excavator is reduced to excavate the tunnel, the outermost periphery can be reliably excavated before and after separation, and the sandy ground and other cutters are worn. It has the effect that it is also suitable for excavation of the ground that is easy to do.

Further, there is an effect that it can be used as a multiple-type underground excavation-side device without being separated.

[Brief description of the drawings]

FIG. 1 (a) is a plan view of a tunnel constructed underground according to the present invention, (b) is a side view of the same, FIG. 2 (a) is a front view of the device of the present invention, and (b) is a view. FIG. 3 is a side view showing the operation of the present invention. DESCRIPTION OF SYMBOLS 1 ... Shield cylinder, 1A, 1B ... Shield member, 11 ... Multi-partition partition, 12a, 12b ... Partition part, 27a, 27b ... Hood part, 28a, 28b ... Shield hull.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazunobu Taoka 1-44 Shinkawa, Chuo-ku, Tokyo Inside Taitoyo Construction Co., Ltd. (56) References JP-A-1-268991 (JP, A) JP-A-3 JP-A-62-288298 (JP, A) JP-A-62-190789 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/06 301 D E21D 9/08 A

Claims (1)

(57) [Claims] 1. A multiple underground excavator is used to excavate a tunnel having a multiple section to a predetermined position, and a cutter wing of the multiple underground excavator without constructing a shaft at a predetermined point. In the shield cylinder of the multiple underground excavator, a multiple partition wall is provided, and the multiple partition wall is provided with a plurality of slidable forward sliding barriers of the reduced shield machine. A partition member is provided, and a shield member extending rearward and provided as a part of a shield cylinder is provided on an outer peripheral portion of each partition portion, and each hood portion of a plurality of reduced shield machines to be started next Is assembled in front of the shield member, a shield hull portion is provided behind the shield member, a propulsion jack is provided inside the shield hull portion, and the partition wall is slid forward from the multiple-shaped partition wall. Separately, a plurality of tunnels having an independent circular cross section are excavated continuously from the predetermined point, and a plurality of tunnels having an independent circular cross section and a plurality of tunnels having an independent circular cross section can be excavated almost simultaneously. Underground drilling method.