JPH06193392A - Arranging method for segment in shield method - Google Patents

Abstract

PURPOSE:To prevent the peeling and damage of a sealing material at the time of the assembly of a segment by press-fitting the finally assembled segment, in which the water swelling sealing material is coated with a water-permeable lubricant, between key adjacent type segments. CONSTITUTION:A high-molecular water swelling resin is mixed and kneaded with a rubber component such as a natural rubber, and extrusion-molded and formed in a flat stringy shape in a water swelling sealing material 1 disposed on the joint surfaces of key type segments as finally assembled segments constituting a cement ring. A lubricant, by which water permeability can be ensured even when the lubricant is applied, is selected. The key type segments can be press-fitted and arranged unforcedly by coating such a sealing material 1 with the lubricant, thus generating no peeling and damage in the sealing material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of arranging a shield segment in a shield construction method, and more particularly to a method of arranging a shield segment in which a sealing material is attached to a joint surface.

[0002]

2. Description of the Related Art The purpose of the primary lining in the shield construction method is to form the tunnel in the soil while preventing the ground from collapsing. Supported by lining. Therefore, a method of assembling in the shield is used for the primary lining, using blocks called segments that are divided for easy assembly.

This segment is made of steel, concrete, or the like, but is assembled for each ring as shown in FIG. 1, and this ring is connected in the length direction of the tunnel according to the propulsion of the shield machine. In general, one ring consists of a standard segment (A segment), a key adjacent segment (B segment), and a key segment (K segment), which are 3 segment segments. Become. Particularly, of these, the key type segment is the final assembly segment assembled to complete the ring, and is assembled by pushing it into the space between the already assembled key adjacent type segments (B type segments). To facilitate such assembling, the key type segment has a tapered joint surface so that the diameter is narrowed toward the outer circumference of the tunnel, and the joint surface of the key adjacent type segment to be joined to the joint surface is inversely tapered. Often there are. By adopting the taper structure in this way, the wedge effect of the key type segment can be expected.

Further, in order to prevent water leakage from the joint surface, it is necessary to stop the water with a sealing material. As the sealing material, unvulcanized butyl rubber having adhesiveness, synthetic rubber having resilience, natural rubber, etc., and combinations thereof have been used in the past, and in recent years, swelling polymer substances have been used. The water-swellable sealing material 1 using is used.
The water-swellable sealing material 1 using such a swelling polymer substance has a swelling property in addition to the conventional restoring force of rubber, and therefore exhibits a performance superior to that of a non-swelling normal rubber sealing material.

The water-swellable sealing material 1 is formed into a flat string shape, and when a concrete segment is taken as an example, a disposing groove is formed on the joint surface thereof, and the lower half portion is formed in this groove. Affixed along the groove to fit. The attachment of the water-swellable seal material 1 to the outer circumference of the segment is performed before assembling the segment, and the segment with the seal material 1 is assembled by the segment erector in the shield.

[0006]

When assembling the segment with the water-swellable sealing material 1 as described above, the water-swellable sealing material 1 is projected at the joint surface of the segment,
The seal material 1 and the segment or the seal material 1 rub against each other, and a frictional force is applied to the seal material 1 to damage the seal material 1 such as peeling or breakage, and it may not be possible to expect a perfect seal. Furthermore, there is a risk that the insertion of the K-shaped segment will be unreasonable and a large gap will occur between the segments.

An object of the present invention is to solve the above-mentioned disadvantages of the conventional example, and to provide a method of arranging segments in a shield construction method capable of improving the safety against peeling and damage of the seal material during segment assembly and the segment assembly accuracy. To provide.

[0008]

In order to achieve the above object, the present invention relates to a shield construction method for assembling a segment ring in which a sealing material is attached to a joint surface and sequentially joining the segment rings to construct a tunnel. A water-swellable sealing material is used as the water-swellable sealing material disposed on the joint surface of at least the key type segment (K segment) which is the final assembly segment of the segment ring, and the water-swellable sealing material is dry or wet. The gist of the invention is to apply the lubricant and then press-fit the key type segment between the key adjacent type segments.

If a lubricant other than water-permeable is used as the lubricant, the lubricant will form an impermeable layer on the surface of the water-swellable seal material, and the seal material will not be able to exert water swelling effect. Become. As the water-permeable lubricant, there are a volatile dry type and a wet type, but any of them may be used. Further, this lubricant is kept in a liquid state and is applied to the sealing material portion with a brush by using a segment to which a water-swellable sealing material before being mounted is attached.

[0010]

The peeling / damage of the sealing material during the assembly of the segments is particularly caused when the key type segment (K type segment) which is the final assembly segment constituting the segment ring is press-fitted between the key adjacent type segments (B type segment). It is easy to occur. The standard type segment (A type segment) other than the key type segment (K type segment) and the key adjacent type segment (B type segment) are sequentially assembled from the end, and the segment ring is completed in the assembly. This is because there is no simultaneous joining of the left and right ends and the periphery of the rear end.

As a result of intensive studies, the inventors of the present invention have found that if the key ring segment (K segment) is press-fitted and the portion of the sealing material is pushed in reasonably, the segment ring as a whole is in a completely sealed state. I found that I could keep it. Then, by applying a lubricant to the sealing material, it is possible to improve the slipperiness of the sealing materials, and as a result, the key-shaped segment can be press-fitted and arranged without force, causing peeling or damage to the sealing material. There is no fear. Further, the gap between the segments after the assembling of the segments can be made extremely small, and the segment assembling accuracy can be improved.

[0012]

EXAMPLES Examples of the present invention will be described in detail below. In the present invention, a dry or wet water-permeable lubricant is applied to the water-swellable sealant disposed on the joint surface of the key-shaped segment (K segment) that is the final assembled segment constituting the segment ring. First, regarding this water-swellable seal material, a rubber component such as natural rubber, liquid rubber, synthetic rubber, or chloroprene rubber is mixed with a polymer water-swellable resin, kneaded, and extruded to form a flat cord. It was done. As the polymer water-swellable resin, a water-absorbent polyurethane resin, a vinyl alcohol / acrylate copolymer, or the like can be selected. Alternatively, the water-swellable urethane resin itself is molded into a flat string shape.

The shape of the water-swellable sealing material is generally a flat string, but its cross-sectional shape is a rectangular shape or a trapezoidal shape, and ribs may be provided in the length direction as appropriate, so that it is formed into an arbitrary shape. it can. Further, a non-water-swellable member is combined with this water-swellable sealing material to form a multi-layered material,
It may have a core material.

As a lubricant to be applied to the water-swellable sealing material, a dry type is prepared by dissolving polytetrafluoroethylene telomer in a solvent such as freonsolve, and a wet type is made of polyethylene glycol or glycol. Acid soda, equol regular, fatty acid salts such as oil fatty acid amides, polyoxypropylene monol, or those obtained by dissolving these in a solvent, and others, which ensure water permeability even when applied, are selected . The dry lubricant is applied at the time of factory shipment or on the spot, and the wet lubricant is applied on the spot.

The above-mentioned lubricant is not only applied to the water-swellable sealing material arranged on the joint surface of the key type segment (K segment), but also the key adjacent type segment (B type segment).
You may make it apply | coat also to the segment of the side.

Next, the results of tests conducted to test the effects of the present invention will be described. As a test method, FIG. 2 and FIG.
As shown in, the seal material is attached and cured at a predetermined position of each segment model 3 and 4. Then, each model of the central segment model 4 is set between the both side segment models 3 to a predetermined value of the press-fitting amount δ, and the bolt 5 is tightened until the opening between the combination pieces becomes 0 mm. Compressor 2
Using, press the central segment model 4 until δ = 0 mm.

As an observation item, the relationship between the press-fitting amount δ and the press-fitting load F δ = δ _{0 to 0} mm The deformed state of the sealing material after press-fitting (the range that can be observed by the external appearance) was disassembled and then the sealing material and its adhesive surface were disassembled. Presence or absence of damage or peeling, etc. Place pressure sensitive paper on the bottom plate and observe the distribution of the contact surface pressure during press fitting.

The test results are shown in Table 1 below. In addition,
In Table 1, Test A is a water-swellable sealing material,
Natural rubber-based water-swelling rubber was used, Test B was using water-swelling polyurethane rubber, and Test C was using chloroprene-based water-swelling rubber.
It is a sealing material with a trapezoidal cross section having a thickness of about 8 mm and a thickness of about 8 mm.

[0019]

[Table 1]

The press-in test items in Table 1 are based on Table 2 below.

[0021]

[Table 2]

Taking the case of test A in Table 1 as an example, the reaction force ratio between case 1 and case 2 is shown in the graph of FIG. The same applies to the test B and the test C other than the test A.

As can be seen from Table 1 and FIG. 4,
When a lubricant is applied, good results can be obtained without peeling of the sealing material.

[0024]

As described above, according to the method for arranging segments of the shield method of the present invention, it is easy and inexpensive to improve the safety against peeling and damage of the seal material during segment assembly and the segment assembly accuracy. It can be done.

[Brief description of drawings]

FIG. 1 is a perspective view showing assembly of a shield construction segment.

FIG. 2 is a front view of a test apparatus.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a graph showing a reaction force ratio in a press fit test.

[Explanation of symbols]

 1 ... Water-swellable sealing material 2 ... Compressor 2, 3 ... Segment model 5 ... Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 000002288 Sanyo Kasei Co., Ltd. 1 1-11 Ichibashihonhoncho, Higashiyama-ku, Kyoto-shi, Kyoto Prefecture (71) Applicant 000106726 SI Kasei Co., Ltd. 1-18-1 Kyobashi, Chuo-ku, Tokyo No. (71) Applicant 000005278 Bridgestone Co., Ltd. 1-10-1 Kyobashi, Chuo-ku, Tokyo (71) Applicant 000006714 Yokohama Rubber Co., Ltd. 5-36-11 Shinbashi, Minato-ku, Tokyo (72) Inventor Hisao Motomura Tokyo 8-14-48 Nanpira, Miyano, Hino City (72) Yutaka Kobayashi 543-16 Kitano-cho, Hachioji-shi, Tokyo (72) Inventor Takuo Fukushima 7-35 Higashiohisa, Arakawa-ku, Tokyo Within Asahi Denka Kogyo Co., Ltd. (72) Inventor Yutaka Kawahara 1-11, Hitotsubashi-honmachi, Higashiyama-ku, Kyoto Prefecture Sanyo Chemical Industry Co., Ltd. (72) Inventor Kazuhiro Takasaki Atago, Ageo City, Saitama Prefecture 3-1-22 CI Kasei Co., Ltd. (72) Inventor Keiji Nitta 6-2304, Minami Sanrokusho, Yokohama City, Kanagawa Prefecture (72) Inventor Tomohiro Mori, Tokunobe, Hiratsuka City, Kanagawa Prefecture 490-1039

Claims (1)

[Claims] 1. A shield construction method for assembling a segment ring having a sealing material attached to a joint surface and sequentially joining the segment rings to construct a tunnel, wherein a water-swellable sealing material is used as the sealing material, and at least the segment ring is used. The key type segment (K segment), which is the final assembly segment of the above, is coated on the surface of the water-swelling sealant with a dry or wet water-permeable lubricant, and then this key type segment is formed. A method for arranging segments in a shield construction method, characterized in that press-fitting is performed between key adjacent type segments.