JPH01322095A - Tail seal construction in tunnel drilling machine - Google Patents

Abstract

PURPOSE:To increase fitting strength by providing an annular holder forming a circular brush mounting groove along the internal surface of a tail part and coupling a brush unit thereto with a brush base retained with a brush holding fitting. CONSTITUTION:A brush material 11 comprising a metal wire and the like is made to stride over a core material 2, folded into two and held with a clamping fitting 13. In addition, the material 11 is overlaid in a plural layer, clamped with an inner protection board 15 and an outer protection board 16 and further clamped with a brush holding fitting 17, thereby forming a brush unit A. Also, an annular holder 21 having a brush mounting groove 20 is fitted along the internal surface of the tail part 19 of a drilling machine body. In addition, each of the units A is coupled and arranged in a circular order into the groove 20 and the units A are welded to each other at a position adjacent to the fitting 17. According to the aforesaid construction, the annular mounting of the brush units A can be strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tail seal structure for preventing the inflow of backfilling mortar and earth and sand in a tunnel excavator.

Prior Art As shown in FIGS. 1A and 1B, a conventional tail seal brush has a steel material 2 that forms an annular step 3 attached along the inner peripheral surface of a tail portion 1 of a cylindrical excavator body. The brush holding metal fittings 4 of a large number of brush units A are filled and positioned in the stepped portion 3, and the brush holding fittings 4 are attached to the stepped portion forming steel material 2.
In addition to welding 5 and 7 at the adjacent parts to the tail part 1, the brush holding metal fittings 4 are firmly welded 6 to each other at the adjacent parts, and only the welds 5, 6 and 7 are removed. The units A are arranged and attached in an annular manner on the inner peripheral surface of the tail portion 1.

Problems to be Solved by the Invention As described above, conventionally, when a large number of heavy brush units A are arranged in a ring along the inner peripheral surface of the tail part, the attachment means is to attach each brush unit to the large number of brush units one by one. Since the brush units are welded to the step-forming steel material 2 and the tail section 1 and held on the same inner circumferential surface, installation is very time-consuming, and each brush unit must be welded while being held in place by a worker. Forced to do strenuous work.

Also, when extruding segments, a huge load and impact are applied to the brush unit, so it is necessary to have mounting strength that can withstand this.
There is a problem of lack of reliability in that the mounting strength of each brush unit A depends only on welding, which is a heavy dog. have.

The present invention was provided for the purpose of solving the above problems.

Means for Solving the Problems The present invention, as a means for achieving the above object, attaches an annular bolter forming an annular brush loading groove along the inner peripheral surface of the tail portion of the main body of a tunnel excavator having a cylindrical shape; A large number of brush units each having a brush material base held by a brush holding hardware are formed, and each brush unit is closely fitted into the annular brush loading groove with the brush holding hardware so as to be arranged in an annular shape. The structure is such that the above-mentioned annular attachment is achieved using appropriate welding.

Operation: The annular holder is placed in advance on the inner peripheral surface of the tail portion, and a large number of separately prepared brush units are fitted one after another into the annular brush loading groove formed by the annular holder to load the annular brush. By sliding them in the grooves, they are brought into close contact with each other and arranged in an annular shape. As a result, the heavy brush material bases 1 to 1 are captured and supported within the brush loading groove, and are carried in an annular arrangement on the inner circumferential surface of the tail portion without falling off. When the brush unit is supported, the annular area is firmly attached to the inner peripheral surface of the tail part by welding each brush unit to each other or between each brush unit and the annular bolter, or between the tail parts at mutually adjacent parts. It is.

The brush units can be easily formed in an annular array by simply fitting one after another into the annular brush loading groove formed by the annular holder, and the individual brush units can be easily welded while being supported by the annular holder. Therefore, the operation of disposing and removing the brush unit annularly on the inner circumferential surface of the tail portion can be easily performed.

In addition, it provides a uniform, robust, and reliable installation compared to traditional tail seal structures that rely solely on welding. Also, unlike the conventional example in which the mounting strength is obtained only by welding, the annular holter ensures the mounting strength of the brush unit group, and when used in combination with welding, welding work and build-up can be significantly reduced.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 2 to 7.

As shown in FIGS. 2 and 3, a brush material 1 made of metal wire or the like is folded in two over a core 12, and the bent base is held together with a clamping fitting 13.

This is sandwiched and held, stacked in multiple layers and sandwiched between an inner protection plate 15 and an outer protection plate 16 made of spring steel plates, and these are sandwiched and held by thick brush holding hardware 17 to form a brush unit A.

As shown in the figure, the brush material 11 is housed in the inner bottom of the brush holding metal fitting 17 on the side of the clamping tool 13, and its tip extends toward the front of the brush holding metal fitting 17, and the inner and outer protective plates 15
．． 16 is bent in a dogleg shape at a portion protruding from the brush holding hardware 17, and is arranged so that its elasticity pushes the bristles of the brush material 11 against the outer peripheral surface of the segment.

On the other hand, as shown in FIGS. 4 to 7, an annular holder 21 forming an annular brush loading groove 20 is attached along the inner peripheral surface of the tail portion 19 of the cylindrical tunnel excavator main body 18.

As the annular holder 21, as shown in FIGS.
9, and an annular brush loading groove 20 is formed along the inner circumferential surface of the tail portion. Alternatively, as shown in FIG. 6, a metal channel 21b having a U-shaped cross section is annularly attached to the inner peripheral surface of the tail portion 19 to form the annular brush loading groove 20.

The brush units A described above are successively fitted into the annular brush loading groove 20 formed as described above using their brush holding hardware 17, and are moved in the circumferential direction within the loading groove 20 by the guiding action thereof. At the same time, the brush holding hardware 17 is brought into close contact with each other, and the brush unit A group is arranged in an annular shape along the brush loading groove 20.

In this way, the brush units A group are captured in the annular brush loading groove 20 and supported on the inner circumferential surface of the tail portion 19 in an annular arrangement.

As mentioned above, brush unit A or annular brush loading fm 2
0, each brush unit A is successively welded 22 at adjacent portions of the brush holding hardware 17 to be integrated.

Also, welding 23 between the end of the annular holder 21 and the inner surface of the brush holding metal fitting 7 adjacent thereto, and welding 24 between the end of the brush holding metal fitting 17 and the inner surface of the tail portion 19 adjacent thereto.
Then, the brush units ART are connected to each other in an annular arrangement within the loading groove 20, and integrally attached to the tail portion 19.

That is, the brush units A group are supported in an annular arrangement on the inner peripheral surface of the tail portion 19 by the annular halter 21, and are integrally and firmly fixed to the inner peripheral surface of the tail portion.

- The welds 23 and 24 at the adjacent parts of the brush holding hardware 17, the annular holter 21, and the tail part 19, and the welding 22 at the mutually adjacent parts of the brush holding hardware 17 are greatly reduced compared to conventional ones. That's enough.

At least the entire weight of the brush unit A group attached to the tail portion 19 is almost entirely supported by the annular holder 21, and the annular arrangement is maintained in a healthy state. In addition, the annular holder 2
1 exhibits supporting capacity. Welding can therefore be limited. For example, the welding 6 in the conventional example is responsible for the strength for annularly connecting the individual brush units A group and supporting them annularly on the inner circumferential surface of the tail portion. Rather, emphasis can be placed on the welding 22 at the adjacent portions to satisfy the sealing function of preventing muddy water from leaking between the brush units.

Alternatively, the welding 23 between the end of the annular holder 21 and the adjacent portion of the brush holding metal fitting 17 and the welding 24 between the end of the brush holding metal fitting 17 and the inner surface of the tail portion 19 are performed in a limited range as described above, or in any case. The welding on one side and the annular porter provide strength against the tensile load during segment extrusion.
On the other hand, it is also optional to omit it.

In addition, since the brush unit A group is fitted into the annular brush loading groove 20, this fitting surface is used as an adhesive surface (including brazing), and a means is provided to achieve a strong bond within the same loading groove 20. There are many things to do.

For example, as shown in FIG. 4, the annular porter 21 is provided with a mounting opening 25 that reaches the annular brush loading groove 20.
Fill the weld metal from the same place, or similarly, provide a groove or the like opening at the end face of the annular holter on the inner surface of the loading groove 20, and take measures to fill the weld metal at the same place.

Furthermore, an example is also included in which the brush holding metal fitting 17 is fixed or pinned to the annular holder 21 at the attachment opening 250 and integrated therewith.

As shown in FIGS. 5 and 6, the annular porter 21
It is also possible to install two or more stages of brush units at intervals in the front and back, and to arrange the brush units in a multi-layer arrangement.

Effects of the Invention Brush units currently in use weigh about 2 kg each, and for example, even a relatively small 1-thin tunnel excavator body with a diameter of 5 m requires a group of 150 or more brush units, making the total weight very heavy. It reaches over 300kg. Conventionally, these brush unit groups have been attached to the inner circumferential surface of the tail portion relying only on welding, and therefore lack reliability and require extremely heavy welding.However, according to the present invention, the brush unit group The entire weight of the annular holder is secured by the annular holder above the road, and the annular holder can exert its supporting force even against the protruding blade that accompanies segment extrusion. Therefore, the annular attachment can be performed with extremely strong strength compared to the conventional method which relied only on welding strength. In addition, the need for welding as a means for maintaining strength can be reduced compared to conventional methods, resulting in labor savings.

In addition, according to the present invention, an annular arrangement can be easily formed by simply fitting a large number of brush units into the annular brush loading groove formed by the annular holder one after another, and the adjacent brush units are guided by the brush loading groove. By fitting while pressing, a mutually close state can be easily obtained.

Further, each brush unit can be individually welded or bolted while being supported by the annular holder, making positioning during welding and welding work extremely easy.

[Brief explanation of the drawing]

Figure 1A is a sectional view showing the main parts of the tail seal structure (brush unit mounting structure) in a conventional tunnel excavation machine, and Figure 1B is a view from inside the tail part showing the arrangement and welding state of the brush unit. The plan view and FIGS. 2 to 7 show embodiments of the present invention, and FIG. 2 is a side view of the brush unit.
Fig. 3 is a plan view of the same, Fig. 4 is a partially cutaway perspective view showing the structure for attaching the brush unit to the tail part, Fig. 5 is a sectional view of the same, Fig. S6 is a sectional view of the same showing the other side, and Fig. FIG. 7 is a front view of the tail portion schematically showing the annularly attached state of the brush unit group. A... Brush unit, 11... Brush material, 17.
...Brush material holding hardware, 19...Tail part, 20...
- Annular brush loading groove, 21... annular holder.

Claims (1)

[Claims] An annular holder that forms an annular brush loading groove is installed along the inner peripheral surface of the tail part of the cylindrical tunnel excavator main body, and a number of brush units each having a brush material base held by a brush holding metal fitting are formed. A tail seal structure for a tunnel excavator, in which brush units are tightly fitted into the annular brush loading groove using brush holding metal fittings and arranged in an annular shape.