JPH0540155Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a tail seal for a shield tunneling machine.

[Prior Art] Fig. 3 shows a shield excavator 1 used in the shield construction method, in which a shield jack is installed on the inner circumference of the shield frame 2 to propel the shield frame 2 by applying a reaction force to the existing segments 3. 4 is disposed, and as the shield jack 4 is extended, the front face is moved forward while being excavated with a cutter 5, and the segments 3 are assembled at the rear by an erector (not shown).

Such a shield excavator 1 includes a skin plate 6 at the rear end of the shield frame 2;
A gap 7 between the segment 3 assembled in a ring shape along the inner circumferential direction within the shield frame 2
A tail seal 8 is provided to prevent underground water from entering.

FIG. 4 shows an example of this. Conventionally, a durable, wear-resistant, and flexible wire brush 9 has been used as the main material for this type of tail seal 8, and the wire brush 9 itself has Because it does not have waterproof properties,
Incorporating the mesh 10 into the wire brush 9,
Furthermore, a band 12 is filled with putty grease 11 containing vegetable fibers to provide water-stop properties (see Fig. 5).
Further, a ring-shaped mounting base plate 13 having a folded part having a substantially U-shape with a rearward opening is provided on the inner periphery of the skin plate 6 and fixed by welding, and an opening 14 of the folded part Armor plates 15 and 15' bent toward the segment side (inside) are provided on the inner and outer sides of the wire brush 9, respectively, and the band 12 side of the wire brush 9 is pushed between the armor plates 15 and 15' to compress it in the circumferential direction. In this state, it is fixed to the mounting base plate 13 with bolts 16 or the like. Similarly, a bundle of wire brushes 9 is closely arranged in the circumferential direction of the mounting base plate 13 to form an annular tail seal 8.

Due to the inwardly bent shape of the tail seal 8, the tip end side of the wire brush 9 is pressed against the segment 3 assembled inside to perform sealing.

That is, in the conventional tail seal 8, the segment 3
The gap 7 between the two was sealed.

[Problem to be solved by the invention] However, it is very difficult to fill the wire brush 9 with the plant fiber-containing putty grease 11 without any gaps, and it is difficult to completely stop water, and the grease 11 permeates from the wire brush 9. It was not possible to completely prevent groundwater from flowing. Moreover, the putty grease 11 becomes fluid due to high-pressure water leakage that permeates into the wire brush 9 and gradually flows out of the wire brush 9, so that the water stop function is not sustainable.

In view of the above-mentioned circumstances, the purpose of the present invention is to provide a tail seal that has higher water-stopping properties than conventional ones and has a long-lasting water-stopping function.

[Means for Solving the Problems] The present invention provides a tail seal for a shield excavator in which a wire brush held between armor plates is attached to a skin plate to maintain watertightness between the skin plate and the segment. , at least one of the water-stop membranes is formed by sandwiching a sheet material processed with a water-absorbing polymeric resin material between meshes.
A layer is incorporated into the wire brush.

[Function] The water-absorbing polymeric resin material reacts with groundwater, giving the sheet material a continuous water-stopping function, and the sheet material with this water-stopping function is sandwiched between strong meshes to create a stopper. A wire brush incorporating a water film is pressed against the segment to create a seal between the skin plate and the segment.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows one embodiment of the present invention, and the parts in the figure with the same reference numerals as in FIG. 4 represent the same parts.

As shown in the figure, a required number of layers of a water-stopping film 20 made by sandwiching a sheet material 17 treated with a water-absorbing polymer resin between stainless steel meshes 10 are incorporated into a wire brush 9, and one end of the wire brush 9 is attached to a band. 12, and a ring-shaped mounting base plate 13 having a folded part with a substantially U-shaped cross section opening rearward is provided on the inner periphery of the skin plate 6 and fixed by welding. Armor plates 15, 15' bent toward the segment 3 side (inside) are provided on the outside, and the wire brush 9 is pushed between the armor plates 15, 15' from the band 12 side, compressed in the circumferential direction. Tighten and secure with bolts 16, etc.

Similarly, a bundle of wire brushes 9 is closely arranged in the circumferential direction of the mounting base plate 13 to form a tail seal 19.

The sheet material 17 is made of cloth, nonwoven fabric, paper, or the like that can be processed with a water-absorbing polymer resin, and the processing methods include coating, addition, and impregnation.

Further, as the processing material for the sheet material 17, water-swellable rubber such as isocyanate that expands by absorbing water, water-absorbing hardening (curing) resin, highly adhesive resin, or a mixture thereof is used.

The action will be explained below.

When the shield excavator 1 (see Fig. 3) excavates deep underground, groundwater infiltrates the wire brush 9 of the tail seal 8 from the gap 7 between the skin plate 6 and the segment 3 due to external pressure. When the processed material of the sheet material 17 of the wire brush 9 reacts with ground water, for example, as shown in FIG. 2, the added resin particles (water-absorbing polymer resin material) 18 absorb water and expand, forming the sheet. By clogging the mesh 10 while imparting water-stopping properties to the material 17, a continuous water-stopping function can be exhibited, or by forming a water-stopping film on the surface of the sheet material 17, or by solidifying the sheet material 17 itself. It exhibits a sustainable water-stopping function by changing the material into a water-stopping material.

Even if the sheet material 17 described above does not have strength itself, its strength is maintained because it is sandwiched between the meshes 10 made of stainless steel.

The wire brush 9 incorporating the water-stop film 20 having the water-stop function effectively seals the gap 7 by pressing the armor plate 15 against the segment 3.

Therefore, according to the above, due to the water-stopping function of the sheet material 17 treated with water-absorbing polymer resin, the water-stopping property can be significantly improved compared to the conventional tail seal 8, and furthermore, it is possible to obtain a more sustainable water-stopping effect than before. can.

It should be noted that the tail seal of the shield tunneling machine of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the invention] As explained above, according to the tail seal of the shield tunneling machine of the present invention, the water-stopping performance of the tail seal can be significantly improved compared to the conventional one, and furthermore, a more sustainable water-stopping effect can be obtained than before. Various excellent effects can be achieved, such as the ability to

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of an embodiment of the present invention, Figure 2 is a model diagram schematically showing the internal structure of the tail seal of the present invention, and Figure 3 is a partially cutaway side view of an example of a shield tunneling machine. 4 is a sectional view of an example of a conventional example, and FIG. 5 is a model diagram schematically showing the internal structure of a conventional tail seal. 1 is a shield tunneling machine, 3 is a segment, 6 is a skin plate, 7 is a gap, 9 is a wire brush, 1
0 is the mesh, 13 is the mounting base plate, 1
5, 15' are armor plates, 17 is a sheet material,
18 is a resin particle (water-absorbing polymer resin material), 19 is a tail seal, and 20 is a water-stop film.

Claims (1)

[Scope of utility model registration request] A sheet processed with a water-absorbing polymer resin material in the tail seal of a shield excavator, in which a wire brush held by an armor plate is attached to a skin plate to maintain watertightness between the skin plate and the segment. A tail seal for a shield excavator, characterized in that at least one layer of a water-stopping film formed by sandwiching material between meshes is incorporated into the wire brush.