JPH0384196A - Tail seal for shield excavator - Google Patents

Abstract

PURPOSE:To obtain a water-stopping effect by a method in which a water stop sheet is attached to a brush, and the tip of the water stop sheet is contacted with the ground while backing it up by a spring part by holding its basal end in such a way as to push up the water stop sheet by its recover force. CONSTITUTION:A water stop sheet 13 of an adequate material is attached to the outside of a brush 3 forming a tail seal 1, and the basal end of the sheet 3 is held with the brush 3 and inner and outer protective plates 11 and 12 by a brush holder 10. The tip of the sheet 13 is contacted with the ground 4 while backing it up by a spring part 14, where the spring part 14 serves to recover it due to its high flexibility along the recessed and projected portions of the ground 4; that is, the sheet 13 is pushed up to make it contact with the ground 4, permitting its water-stopping effect to exhibit. Even in the case where the ground is undulated and small stones are present on the ground-contact face of the sheet 13, high mud water-shielding effect can be effectively kept.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a tail seal made of brush material which is annularly attached to the rear end face of a shield tunneling machine.

Conventional technology The tail seal used in tunnel lining using a shield excavator, the so-called PCL method, has the purpose of preventing the blocking material injected into the back side of the lining concrete from flowing into the face side, and at the same time prevents the back of the face (excavation The purpose of this shield is to prevent muddy water from flowing around to the mooring block side from the over-drilling gap formed at the back end of the shield excavator ( (Skin plate) Place the tip of the brush material in a ring shape on the surface and touch it with the ground.
A stopper is placed on the inside of the tail seal (inside the brush material) and on the outside to prevent muddy water and gravel from entering the over-excavation gap.

Problems to be Solved by the Invention Although the above-mentioned brush material is filled with grease to provide water-blocking properties, since the brush material itself is an aggregate of filaments that lacks water-blocking properties, the above-mentioned over-drilling gap Number K from the side
Under groundwater pressure of "g/cm", water permeation to the above-mentioned stopper board side cannot be avoided. Therefore, as a proposal, a water-stop sheet is attached to the outer surface of the brush material facing the above-mentioned over-excavation gap side, and the tip of the sheet is attached to the brush material. Another possible method is to bring the tip of the material into contact with the ground.

However, it is difficult for a flexible water-stop sheet to adapt to the irregularities of other mountains and make contact with them, and in addition, gravel that exists in the gaps left over from excavation due to excavation is interposed between the contact surface of the tip of the brush material and the ground, making it difficult to make contact with the unevenness of other mountains. If the water sheet is pushed into the brush material, it becomes difficult to maintain close contact with the ground, resulting in the problem that the water stop sheet cannot fully fulfill its purpose of stopping trees.

The present invention aims to solve the above problems.

Means for Solving the Problems The present invention provides the above-mentioned means by attaching a water stop sheet made of an appropriate material to the outer surface of the brush material forming the tail seal, and at the same time attaching a water stop sheet made of an appropriate material to the inner or outer surface of the stop sheet. This structure is such that the tip of the water stop sheet comes into contact with the ground while being backed up by a spring member extending in the direction of the water stop.

Function As described above, the water stop sheet brings the tip of the water stop sheet into contact with the ground while being backed up by a plurality of spring members extending in the direction in which the brush material extends. The spring material bends in areas where there are irregularities in the ground or pebbles, and then releases them backwards to restore the structure. When the spring material is present on the inner surface of the water stop sheet, the spring material restores the water stop sheet to push up the water stop sheet and bring it into good contact with the ground, thereby maintaining the water stop effect. Also, even if the spring material is on the outside of the water stop sheet, the entire length of the spring material bends at the part where there are pebbles or unevenness, and the water stop sheet is pushed down together with the brush material through this spring material, so the pebbles etc. To effectively prevent a situation where the extreme part of the tip of the brush material is directly pressed and cut into the extreme part of the tip of the brush material, and to restore the state of contact with the ground with the restoration of the spring material. In addition, the spring material protects the water stop sheet well, and the water stop sheet blocks moisture passing through the spring material.

EXAMPLES The present invention will be explained below with reference to FIGS. 1 to 6. 1st
The figures schematically show the usage state for explaining the function of the tail seal, and from FIG. 2 onwards, the tail seal is shown attached to a shield tunneling machine and placed in the above-mentioned usage state.

As shown in FIG. 1, a large number of unit tail seals 1 are arranged in parallel along the rear end of the shield tunneling machine, that is, along the outer peripheral surface or the inner peripheral surface of the rear end of the skin plate 2 of the shield tunneling machine, and the tip of the brush material 3 is attached to the skin plate 2 of the shield tunneling machine. It is oriented so as to contact the ground 4 around the brake 12.

A water stop material 5 is injected into the back side of the lining concrete 7 backed up by the formwork 9 via a press ring 5 placed on the inner peripheral surface of the skin plate 2, and the remaining water is poured into the rear of the face of the shield excavator. A digging gap 8 is created, and the brush material 3 of the tail seal 1 is attached to the water stop material 5 on its inner surface.
This prevents muddy water from flowing into the face side, and prevents muddy water present in the over-excavation gap 8 from flowing into the stop lug 5 side on the same outer surface.

As a means for unitizing the tail seal 1, for example, as shown in FIG. A metal inner protection plate 11 is attached to the side surface, a metal outer protection plate 12 is attached to the outer side surface, and the base end thereof is attached to the brush material 3.
It is clamped and held together with the brush holder 10. The tail seal 1 is attached by the brush holder 10 to the rear end of the excavator, that is, to the rear end surface of the skin plate 2 via bolts, welding, or the like.

In addition to an example in which the brush material 3 is clamped and held in advance by the brush holder 10, FIG. 2. Tightening includes a fixing assembly structure.

Then, a water stop sheet 13 made of any material is attached to the outer surface of the brush material 3 forming the tail seal 1, and the base end thereof is held in the brush holder 10 to hold the brush material 3 and the inner and outer protection plates 11°. 12 and hold the sheet together with the tip 1 of the same sheet.
3a is attached so as to protrude beyond the tip of the brush material 3, and the inner or outer surface of the water stop sheet 13 is backed up by a plurality of spring members extending in the extending direction of the brush material.

As a suitable example of the backup spring material, as shown in FIG. 3, the outer protection plate 12 is cut in the direction of brush extension at the tip end to form a number of strip plate spring materials 14 in parallel. As shown in FIG. 2, it is held in a brush holder 10 and serves also as a protection plate.

5A and 5B show an example in which the outer protection plate 12 and back-up spring material 14 is interposed on the inner surface of the water stop sheet 13, and FIG. An example is shown below. In addition, B in the same figure is the spring material 14.
An example is shown in which the inner side of the water stop sheet 13 is backed up and another outer protection plate 15 is further attached to the outer side of the water stop sheet 13.

The spring material 14 may also be used as a protection plate, or may be replaced with a wire material such as a piano wire. In this case, for example, according to the purpose shown in FIG. 5B, the inner surface of the water stop sheet 13 is backed up with a spring material 14 made of a wire or tape material, and the proximal end of the wire is held by the brush holder 10. Depending on the implementation, the brush material 3 can be held in the brush holder 1O while being attached to the outer surface side of the brush material 3. Both the wire rod and the strip-like spring material extend in the direction in which the brush material extends, are separated in a direction perpendicular to the direction in which the brush material extends, and have independent flexibility.

Furthermore, FIG. 346 shows an example of backing up the water stop sheet 13 with the spring material 14, in which the water stop sheet 13 is used to enclose the spring material 14. In this case, the water stop sheet 13 may be freely superimposed on each spring material 14, or may be fixed to each spring material or a part thereof. The same is true.

As shown in FIG. 4A, the spring members 14 are normally aligned on the same plane and back up the water stop sheet 13, but as shown in FIG. Is the unevenness of the ground 4 in contact with the contact surface, or is there an excess excavation gap 8?
When a pebble 16 is present, the spring material 14 is deflected at the unevenness or the part where the pebble 16 is present, and then returns to its original state after being deflected backward.

When the spring material 14 is present on the inner surface of the water stop sheet, the spring material restores the water stop sheet 13 to also push up the water stop sheet 13 and bring it into contact with the ground 4 to maintain the water stop effect.

In addition, when the spring material 14 is present on the outer surface of the water stop sheet, the entire length of the spring material is bent at the part where there are pebbles 16 or unevenness, and the water stop sheet 13 is pushed down together with the brush material 3 via this spring material 14, and the spring material 14 will be restored and the state of contact with the ground will be regenerated. Further, the spring material protects the stop sheet 13 well, and the water stop sheet 13 blocks moisture passing through the spring material 14.

The present invention uses the water stop sheet 13 as an inner protection plate! It is not prohibited to attach it to the inner or outer side of the.

Effects of the Invention As explained above, the present invention is applicable to tunnel lining using a shield excavation machine, particularly in the PCL method, while preventing muddy water from flowing into the over-excavation gap into the stop timber side using a water stop sheet. If irregularities or pebbles are present on the ground contact surface of the water stop sheet, the backup spring material will be deflected directly or indirectly at the part where the irregularities or pebbles are present, and will restore the shape while properly releasing the deflection to the rear. The water stop sheet is then restored to its original state and the state of contact with the ground is regenerated to effectively maintain the muddy water blocking effect. In other words, it effectively prevents the water-stop sheet from being pushed into the tip of the brush material by the irregularities or pebbles of the ground, which would impede the close contact with the ground, and prevent the action of the water-stop sheet from occurring. It can be used in any way possible, which in turn promotes the implementation of the brush property tail seal.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; Fig. 1 is a cross-sectional view showing an example of how the tail seal is attached to a shield excavator, Fig. 2 is a cross-sectional view showing the tail seal, and Fig. 3 is a back-up spring material. Figure 4A is a cross-sectional view of the tail seal showing an example, Figure B is the same cross-sectional view showing the state when pebbles are present, and Figures A, B, and C are the backup spring material with a water stop sheet. Figure N6 is a cross-sectional view showing an example in which a spring material is covered with a water-stop sheet. 1...Tail seal, 2...Skin plate, 3.
... Brush material, 4... Earth, 5... Water stop material, 6...
・Excess digging gap, 10... Brush holder, 11...
Inner protection plate, 12.15... Outer protection plate, 13...
Water stop sheet, 14-...spring material, ta-...pebble.

Claims (1)

[Claims] A tail seal made of a brush material attached to the rear end peripheral surface of a shield tunneling machine, wherein a water stop sheet is attached to the outer surface of the brush material, and a plurality of spring members extending in the extending direction of the brush material are attached to the water stop sheet. A tail seal in a shield excavator characterized by being backed up by.