JP4081871B2 - High strength wall cutting shield machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a shield machine used for so-called high-strength wall cutting, which is one of tunnel excavation methods.
[0002]
[Prior art]
In recent years, a so-called high-strength wall cutting has been proposed as one of tunnel excavation methods using a shield machine.
[0003]
In this high strength wall cutting, as shown in FIG. 6, the well walls 2 and 2 which are the wellheads of the retaining wall 1 constituting the starting shaft A and the reaching shaft B are composed of a high strength wall or a concrete wall containing a new material. The tunnel walls 2 and 2 are directly cut by the cutter head 4 at the front of the shield machine 3 so that the tunnel is dug up to the reaching shaft B side at once. It has excellent features such as the ability to start and reach the shield machine without the need for ground improvement in the vicinity of the wellhead and the demolition work of the wellhead wall by dangerous human power. In the figure, 5 is a temporary assembly segment for taking the reaction force at the start, 6 is a mud material for preventing the collapsing of the well shaft 2 on the arrival shaft B at the time of arrival, and 7 is a reaction force of the mud material 6. It is a reaction beam for taking.
[0004]
[Problems to be solved by the invention]
By the way, the cutter head 4 of the shield machine 3 used for this high-strength wall cutting has a large number of main cutter bits 8, 8... Mainly for excavating natural ground as shown in FIGS. Further, a plurality of preceding bits 9 having a height higher than that of the main cutter bits 8, 8... And having a narrow cutting width are arranged at a predetermined interval. It is designed to dig while cutting.
[0005]
However, if the excavation distance between the starting shaft A and the reaching shaft B is long, or if there is an obstacle such as a rock in the middle of the ground, the leading bit 9 is worn before reaching the reaching shaft B. Therefore, there is a problem that the well wall 2 of the reaching shaft B cannot be cut reliably.
[0006]
Therefore, the present invention has been devised in order to effectively solve such problems. The purpose of the present invention is to be able to reliably excavate not only the opening shaft of the starting shaft but also the well shaft of the reaching shaft. A high strength wall cutting shield machine is provided.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a high-strength wall cutting shield machine for excavating a tunnel by cutting a wellhead wall of a starting shaft and a reaching shaft with a cutter head that rotates about a central portion. The cutter head is provided with a plurality of main cutter bits for excavating a ground between the starting shaft and the reaching shaft, and a plurality of leading bits for reaching higher than the main cutter bit are arranged, and the leading for the leading in the cutter head in the vicinity of the bit, until the arrival for the preceding bit and the same circumference on placing the outgoing Susumuyo preceding bit you pivot, the starting for the preceding bit, to reach the wellhead wall of the reach for pit In order to protect the reaching leading bit during the interval, the height is higher than the reaching leading bit and the cutting width is wide .
Further, the cutter head is formed by a cutter face plate and cutter spokes extending radially from the center of the cutter face plate, and slits are formed in the cutter face plates on both sides in the rotation direction of the cutter spoke. In a high-strength wall cutting shield tunneling machine for excavating a tunnel by cutting a wellhead wall of a starting shaft and a reaching shaft by rotating in a left or right direction around a rotation axis located on the center of the above, A plurality of main cutter bits that excavate the ground between the starting shaft and the reaching shaft are provided on both sides of the cutter spoke, and a leading bit for reaching higher in height than the main cutter bit is provided in the center of the cutter spoke. Place a plurality of the cutter face plate located on the slits on both sides of the cutter spoke. The height is high and the cutting width from the preceding bit for reach with pivot line bits and the same circumference above is obtained by placing a large the starting preceding bit.
[0008]
That is, the shield machine according to the present invention is provided with a starting leading bit having a higher height and a wider cutting width in addition to the conventional leading bit, and the leading wall on the starting shaft side by the starting leading bit. In addition, the reaching leading bit corresponding to the conventional leading bit is protected up to the well wall on the reaching shaft side.
[0009]
Therefore, in addition to excavation of the pit wall on the starting shaft side, even if the preceding bit for starting wears before reaching the pit wall on the reaching shaft side, the arriving leading bit is replaced by the pit side on the reaching shaft side instead. Since the wall is to be excavated, it is possible to excavate reliably from the start to the arrival.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment for carrying out the present invention will be described with reference to the accompanying drawings.
[0011]
FIG. 1 shows an embodiment of a cutter head 10 of the high strength wall cutting shield machine according to the present invention.
[0012]
As shown in the figure, the cutter head 10 is provided with a cutter face plate 12 on the front surface of a cutter spoke 11 extending radially from the central portion thereof, and a rotation shaft (not shown) connected to the central portion is the center. It is designed to rotate in either the left or right direction.
[0013]
Moreover, the slit 13 extended in the radial direction is each provided in the cutter faceplate 12 of the part in which this cutter spoke 11 is located, and each spoke 14,14 ... of the cutter spoke 11 will be in the state exposed to the front surface. Yes. Further, a pair of main cutter bits 15, 15 are provided on the front surface of the exposed spokes 14, 14,... At a predetermined interval in the radial direction.
[0014]
Therefore, when the cutter head 10 is rotated about its center, the ground in front of the cutter face plate 12 is scraped off by the main cutter bits 15, 15... And the scraped earth and sand are scraped off by the slits 13, 13. The excavation of the natural ground will be carried out by being taken into the inside.
[0015]
Further, as shown in the figure, each of the spokes 14, 14... Of the cutter spoke 11 includes a leading bit for arrival located at the center of each of the spokes 14, 14. .. And a plurality of starting preceding bits 17, 17... Located on both sides are provided at a predetermined interval.
[0016]
First, the leading bit 16 for reaching is for cutting the well wall 2 on the side of the reaching shaft B as described above, and one is provided between the main cutter bits 15 and 15 as shown in FIG. Each bit is positioned higher than the main cutter bits 15 and 15 by a predetermined height (L1).
[0017]
On the other hand, the starting leading bit 17 is for cutting the well wall 2 on the starting shaft A side exclusively, and is located on the cutter face plate 12 side with the slits 13 on both sides of the main cutter bits 15 and 15 interposed therebetween. At the same time, the bit height is formed to be higher by a predetermined height (L2) than the reaching preceding bit 16.
[0018]
Further, as shown in FIG. 3, the starting leading bit 17 is disposed in front of the reaching leading bit 16 in the rotational direction, and the excavating width (t2) in the rotating direction is the excavating width of the reaching leading bit 16. It is formed wider than (t1).
[0019]
That is, the leading bit 16 for arrival is arranged so as to follow the same circumference as the leading bit 17 for starting, and the leading bit 17 side for starting first excavates the well wall 2 of the above-described starting shaft A. It is like that. The leading bit 16 for starting and the leading bit 17 for starting are provided with ultra-hard bit tips 19 and 19 on both sides of the tip of the bit body 18, and only the height and the excavation width are different. The same thing is used. Further, as shown in FIG. 1, the leading bit 16 for reaching, the leading bit 17 for starting, and the main cutter bit 15 are attached at positions displaced from those provided in the adjacent spokes 14. Excavation by 17 and 15 is performed uniformly.
[0020]
The operation of the present embodiment will be described above.
[0021]
First, when starting in high-strength wall cutting, the starting leading bit 17 having the highest bit height first contacts the well wall 2 on the starting shaft A side, and the starting leading bit 17 causes the starting bit 17 on the starting shaft B side. The wellhead 2 is cut into a comb shape and cut to form a wellhead through which the entire shield machine can pass. At this time, the reaching leading bit 16 is protected by turning on the same circumference as the starting leading bit 17 and is not directly in contact with the well wall 2 on the starting shaft A side. 19 and 19 hardly wear out.
[0022]
Next, when the well wall 2 on the start shaft A side is cut in this way, the main cutter bit 15 having the widest cutting width together with the starting leading bit 17 comes into contact with the natural ground, and this is sequentially excavated. Will go. At this point in time, the reaching leading bit 16 is protected by the starting leading bit 17 in the same manner as described above. Therefore, the reaching leading bit 16 is hardly worn without directly cutting the ground.
[0023]
After that, when excavation progresses in this way and the cutter head 10 eventually reaches the well wall 2 on the arrival shaft B side, as with the well wall 2 on the start shaft A side, it is for starting with the highest bit height. The leading bit 17 comes into contact first and cuts it, but since the starting leading bit 17 is always in contact with the ground from the time of starting to this point, the wear proceeds greatly. In most cases, the ability to dig the well wall 2 on the reaching vertical shaft B side is no longer present.
[0024]
On the other hand, the arrival leading bit 16 protected by the starting advance bit 17 is hardly worn at the time of arrival, or the degree of wear is negligible. When it disappears, instead of this starting leading bit 17, the reaching leading bit 16 exhibits its cutting ability to cut the well wall 2 on the reaching shaft B side well and reliably.
[0025]
That is, the shield machine according to the present invention includes a starting leading bit 17 having a higher height and a wider cutting width in addition to the conventional leading bit 9, and the starting leading bit 17 allows the starting shaft A to be started. In addition to excavating the side well wall 2 on the side, the reaching leading bit 16 corresponding to the conventional leading bit 9 is protected up to the well wall 2 on the reaching vertical shaft B side.
[0026]
Therefore, in the shield machine according to the present invention, the preceding bit 9 is not worn before the arrival shaft B is reached and loses its function as in the prior art. It becomes possible to perform excavation.
[0027]
The starting leading bits 17 are not necessarily provided on both sides of all the reaching leading bits 16 and may be configured to be provided for some of the leading leading bits 16. In short, it is only necessary to protect at least the number of leading bits 16 for reaching as much as possible to excavate the well wall 2 of the reaching shaft B.
[0028]
【The invention's effect】
In short, according to the present invention, the following excellent effects can be exhibited.
[0029]
{Circle around (1)} In addition to the arrival advance bit, the start advance bit that protects the arrival advance bit is provided, so that the arrival advance bit is not worn before reaching, and the function can be secured up to the arrival point.
[0030]
(2) Therefore, shield excavation from the starting point to the arrival point can be performed reliably.
[0031]
(3) Since a conventional high-strength wall cutting shield machine can be used as it is without producing a new shield machine, it is possible to exhibit excellent economic efficiency.
[0032]
(4) The degree of wear of the main bit as well as the leading bit for arrival is reduced, so that the excavation distance can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a partial front view showing an embodiment of a cutter head according to the present invention.
FIG. 2 is a sectional view taken along line XX in FIG.
FIG. 3 is a partially enlarged view showing a Y portion in FIG. 1;
FIG. 4 is a front view showing a cutter head of a conventional shield machine for high-strength wall cutting.
FIG. 5 is an enlarged view showing a cutter bit provided in the cutter head shown in FIG. 4;
FIG. 6 is a schematic view showing conventional high-strength wall cutting.
[Explanation of symbols]
2 Wellhead Wall 10 Cutter Head 15 Main Cutter Bit 16 Advancing Bit 17 Starting Advancing Bit A A Starting Vertical B B Achieving Vertical

Claims (2)

A high-strength wall cutting shield machine for excavating a tunnel by cutting the wall of the starting shaft and the reaching shaft with a cutter head that rotates around the center. The cutter head reaches the starting shaft. A plurality of main cutter bits for excavating the ground between the vertical shafts are provided, and a plurality of leading advance bits having a height higher than the main cutter bit are arranged, and this reach is reached at the cutter head in the vicinity of the leading bit for arrival. origination Susumuyo preceding bit you turn the use leading bits and the same circumference on place, the starting for the preceding bit, in order to protect the arrival for the leading bit until it reaches the wellhead wall of the reach for pit A high-strength wall-cutting shield machine having a higher height and a wider cutting width than the preceding leading bit . The cutter head is formed by a cutter face plate and cutter spokes extending radially from the center of the cutter face plate, and slits are formed in the cutter face plates on both sides in the rotation direction of the cutter spoke, and the cutter head is formed at the center of the cutter face plate. In the high-strength wall cutting shield tunneling machine for excavating a tunnel by cutting the entrance wall of the starting shaft and the reaching shaft by rotating in the left or right direction around the rotating shaft located above, the cutter spoke A plurality of main cutter bits that excavate the ground between the starting shaft and the reaching shaft are provided on both sides of the shaft, and a plurality of leading bits for reaching higher in height than the main cutter bit are arranged in the center of the cutter spoke. Then, the preceding leading plate for reaching the cutter face plate located in the slits on both sides of the cutter spoke is Preparative high strength wall cutting shield machine, characterized in that the height is high and the cutting width from the preceding bit for arrival placed the wider the starting preceding bits while turning on the same circumference.

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