JPH05302493A - Shield excavator - Google Patents

Abstract

PURPOSE:To reduce the size of a shaft, and to enable excavation to be easily carried out even in a narrow site by constituting a rotary cutter so as to be slidable and by making a hood and a tail plate slidable with regard to a girder. CONSTITUTION:A shield excavator is provided with a cylindrical garter 2 for protecting the interior against earth pressure, and a rotary cutter 3 that is slidable in the axial direction of the garter 2 and also rotatable. A cylindrical independent hood 4 is slidably, externally fitted on the front part of the garter 2, and also a cylindrical independent tail plate 5 is slidably, externally fitted on the rear part of the garter 2. It is so contrived that the overall length of the shield excavator 1 can be extended or shortened by stretching or contracting a slide jack 34. According to the cases where it is slung in or it is used for excavation, the overall length of the excavator 1 can be freely adjusted. Thus, the size of a shaft can be reduced.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a shield machine.

[0002]

2. Description of the Related Art There are various shield excavators, but they are common in that they basically have a cylindrical rigid shell, a face excavating means, and a shield excavating means. This type of shield machine is suspended in the starting shaft and excavating toward the reaching shaft, while extending the entire length of the tunnel while lining work inside the shield. By the way, when excavating the shield machine, after hanging the shield machine, the side surface (mirror) located in the excavation direction in the shaft is cut in accordance with the tunnel shape, and the side surface on the rear side of the shield machine is further cut. He is constructing thick bearing walls and assembling temporary supports. Therefore, in addition to the total length of the shield machine, the starter shaft's inner space dimensions include the work space for starting the well hole and mirror cutting in front of and behind the shield machine, and the bearing wall and temporary support work as reaction force members. It is necessary to add only the installed amount.

[0003]

[Problems to be Solved by the Invention] Utilization under a main road in an urban area is almost saturated with various kinds of buried objects. Therefore, new buried works should be carried out in deep underground, or the construction conditions have been up to now. There is no choice but to plan in places that were not badly targeted. In particular, in the case of adverse conditions where existing structures exist in the neighborhood and the desired starting shaft cannot be constructed, a small shield machine corresponding to the size of the vertical shaft that can be constructed must be manufactured. In addition, there is a disadvantage that the shield diameter is affected by the inner space size of the starting shaft. Also, if you simply shorten the overall length of the shield machine, you can consider designing the tail plate short, for example.
If the tail plate is designed to be short, it will adversely affect the lining work, so it is not feasible.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a shield machine which is most suitable for a site of adverse conditions which has been difficult to construct. Especially.

[0005]

[Means for Solving the Problems] That is, according to the present invention, a cylindrical garter which protects the interior against earth pressure and a front territory of the garter are slidable and rotatable in the axial direction with respect to the garter. It is a shield machine equipped with a rotatable cutter, a cylindrical independent hood slidably mounted on the front part of the garter, and a cylindrical independent tail plate slidably mounted on the rear part of the garter. ..

[0006]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings.

<A> Shield excavator FIG. 1 shows an example of the shield excavator 1 used in the present invention. The shield machine 1 is a cylindrical gutter 2 and a rotary cutter 3 which is located in front of the gutter 2 and is slidable in the axial direction.
And a hood 4 which is mounted on the front end side of the garter 2 and is slidable in the axial direction, and a tail plate 5 which is mounted on the rear side of the garter 2 and is slidable in the axial direction. One of the features of the shield machine 1 of the present invention is that it can be expanded and contracted over its entire length.

<B> Garter The garter 2 is a rigid shell similar to the conventional one, and is equipped with a plurality of shield jacks 21 and an unillustrated erector device inside.

<C> Rotary Cutter The rotary cutter 3 has a plurality of bits 31 on its front surface, and a spindle 32 is connected to the center thereof. Rotating cutter 3 is spindle 3
The bearing 2 is supported by a bearing 23 arranged in the partition wall 22 of the garter 2 so as to allow rotation and sliding in the axial direction. The rotation of the rotary cutter 3 is given by a drive motor 33 provided in the garter 2. In order to allow the rotary cutter 3 to slide in the axial direction, a slide jack 34 is provided between the rear portion of the support shaft 32 and the garter 2. As a mechanism for transmitting rotation while allowing the rotation cutter 3 to slide, key teeth are provided on the outer peripheral surface of the support shaft 32 at equal pitches, and the rotational force from the drive motor 33 is applied to the support shaft 3.
It is possible to employ splines, serrations, etc., in which the boss of the turntable 35 transmitted to the gear 2 is provided with a groove to be fitted therein. still,
The slide jack 34 may be omitted and the support shaft 32 may be simply pushed out.

<D> Hood The hood 4 is a cylindrical body having a diameter larger than that of the garter 2, and is a cylindrical body for covering the space between the rotary cutter 3 and the front part of the garter 2 generated by the extension of the rotary cutter 3. .. The hood 4 is stored in the garter 2 so as not to project forward from the front end face of the garter 2 when suspended in the starting vertical shaft, and fixed in a state in which it projects toward the extension direction in front of the garter 2 when digging. To be done.

<E> Tail Plate The tail plate 5 is a cylinder having a diameter larger than that of the garter 2. Like the hood 4, the tail plate 5 is also housed in the garter 2 so that it does not project rearward from the rear end face of the garter 2 when suspended in the starting shaft, and in the extension direction behind the garter 2 when digging. It is fixed in the state of protruding toward.

[0012]

Next, a method of using the shield machine 1 will be described.

<B> Suspend When the starting shaft is constructed, the shield machine 1 in the contracted state is suspended in the shaft as shown in FIG. That is, the slide jack 34 of the shield machine 1 is extended to draw the rotary cutter 3 toward the garter 2, and the hood 4 and the tail plate 5 are stored in the garter 2.

<B> Mirror Cutting, Temporary Supporting Work Next, the mirror of the vertical shaft is cut in the same manner as in the prior art, and the temporary supporting work is assembled on the rear side of the shield machine 1 to construct a bearing wall. Since the shield machine 1 is in the contracted state, the work can be performed by effectively utilizing the space in front of and behind the shield machine 1.

<C> Extending the shield machine When the preparation is completed, the slide jack 34 is contracted to push the rotary cutter 3 forward as shown in FIG.
Furthermore, slide the hood 4 forward as well, and rotate the cutter 3.
And between the gata 2 are shielded. As a sliding means of the garter 2, a separate jack is provided in the shaft and the pushing force of this jack can be used. After the hood 4 is pushed out, the overlapping portion of the hood 4 and the garter 2 is fixed by bolting or welding.

<D> Excavation The shield jack 21 is extended to obtain a reaction force from the temporary support work and bearing wall in the shaft to start excavation. When the shield machine 1 has dug a distance that allows the tail plate 5 to extend, the tail plate 5 is pushed rearward to further extend the entire length of the shield machine 1. As a sliding means of the tail plate 5, it is pushed out by a separate jack, or only the shield machine 1 is dug with the tail plate 5 left in the shaft, resulting in the tail plate 5
May be extruded. After pulling out the tail plate 5 from the garter 2, the tail plate 5 and the overlapping portion of the garter 2 are fixed by bolts or welding. Finally, the tail seal 51 is attached to the inside of the tail plate 5. Thereby, the shield machine 1 having a size larger than the inner space of the shaft is formed.

<E> While starting, the excavation is continued while the segment 6 is assembled inside the tail plate 5 of the shield machine 1.

[0018]

[Embodiment 2] In the above embodiment, the case where the shield machine 1 is started from the starting shaft is explained, but it is also applicable to the case where the shield machine 1 is started from inside the existing tunnel 7 as shown in FIG.

[0019]

[Third Embodiment] The rotary cutter 3 and the hood 4 when the excavation is completed.
If the tail plate 5 is stored and the length of the shield machine 1 is shortened, the reaching shaft can be made small.

[0020]

As described above, according to the present invention, since the total length of the shield machine can be adjusted, the following effects can be obtained.

<B> Since the vertical shaft is small, construction can be performed on site with a small site, and route selection becomes easy. Furthermore, the acquisition cost of the site and the construction cost of the shaft can be reduced, and the construction period of the shaft can be shortened.

<B> In the case of a small-diameter shield machine which does not require on-site assembly, the length of the machine is short, so that truck transportation is easy.

<C> Since it is possible to start from within the existing tunnel, the vertical shaft becomes unnecessary.

[Brief description of drawings]

FIG. 1 is an explanatory view of a shield machine according to the present invention when contracted.

FIG. 2 is an explanatory view when the shield machine is extended.

FIG. 3 is an explanatory diagram of a second embodiment in which a shield machine is started from within an existing tunnel.

Claims (1)

[Claims] 1. A cylindrical garter which protects the interior against earth pressure, a rotary cutter which is located in front of the garter and is axially slidable and rotatable with respect to the garter, and a front part of the garter. A shield machine with a cylindrical independent hood that is slidably mounted on the inside and a cylindrical independent tail plate that is slidably mounted on the rear of the garter.