JPH0230559Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tail seal for a shield tunneling machine, and more particularly to a tail seal for a shield tunneling machine that improves the water-stopping or sealing performance of a brush-type tail seal.

Generally, a shield tunneling machine has a tail seal 3 attached to the rear end of a cylindrical shield frame 1 to seal between this and the segment 2, as shown in FIG.
In recent years, wire brush type tail seals have been widely adopted because of their good ability to follow steps such as misalignment of segments.
This type of tail seal 3 is generally shown in FIGS.
As shown in the figure, a strip-shaped wire brush 6 is formed by binding a large number of wires 4 with a mounting bracket 5 having a U-shaped cross section.
It has a structure in which it is annularly attached to the inner circumferential surface of the rear end with a presser plate 7 and a fixing bolt. In order to ensure the water-stopping properties of the wire brush 6,
As shown in Japanese Patent No. 107136, wire brushes 6 are usually arranged at appropriate intervals in the axial direction of the shield frame 1, as shown in FIG. Seal 3
A gap S between the front and rear brushes 6 ₁ and 6 ₂ is filled with a filler such as putty or grease.

However, since the wires 4 at the free ends of the brush 6 are free between each other and the clogging effect is low, the filling material tends to flow out and a large amount of the filling material is required to ensure watertightness.

In order to eliminate this drawback, the conventional application
As shown in the microfilm of No. 147968 (Utility Model Application No. 56-64498), a mesh 8 with a high clogging effect as shown in Fig. 2 was sandwiched between the wires 4, but the mesh 8 Since the width was only the width of the wire brush 6 (rectangular), there was no clogging effect between the adjacent brushes T, and a sufficient water-stopping effect could not yet be obtained.

This invention was devised to solve the conventional problems as described above, and its purpose is to develop a shield excavator that can sufficiently increase the water-stopping effect and reduce the consumption of filler material. The purpose is to provide a tail seal.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIGS. 4 and 5, 1 is a cylindrical shield frame of a shield tunneling machine, and a wire brush type tail seal 3 is provided at the rear end thereof. The tail seal 3 is constructed by disposing rectangular wire brushes 6 on the inner peripheral surface of the rear end of the shield frame 1 along the circumferential direction with their ends abutting each other. The wire brush 6 is made by binding one end of a large number of wires 4 with a mounting hardware 5 having a U-shaped cross section, and the wires 4 are bent at the root portion 4a so that their free ends extend diagonally inward. It's bent. And these wire brushes 4
is secured by the holding plate 7 and retaining bolts (not shown).
Each wire brush 6 is fixed to a shield frame 1, and a mesh 10 is disposed on the wire brushes 6 along the circumferential direction of the wire brushes 6 to enhance the water-stopping effect. This message 10
is made of nylon, cloth, metal, etc., and has meshes large enough to cause clogging of the water-stopping filler. In particular, in the embodiment, the meshes 10 are disposed above and below the strip-shaped wire brush 6 and are continuously formed without any cuts along the circumferential direction, thereby making the mesh 10 completely watertight. The upper mesh 10 has its base end between the shield frame 1 and the wire brush mounting hardware 5, and the lower mesh 10 has its base end between the wire brush mounting hardware 5 and the presser plate 7. They are attached by sandwiching each other, simplifying the attachment. In FIG. 4, reference numeral 11 indicates a sealing plate made of a rectangular leaf spring disposed along the circumferential direction of the outer circumference of the wire brush 6 to prevent wire deformation of the wire brush 6, and reference numeral 12 indicates the positioning of the wire brush mounting hardware 5. This is an annular flange formed on the inner circumferential surface of the shield frame 1 in order to

The wire brushes 6 with the above-mentioned mounting configuration are arranged in two or three stages at appropriate intervals in the axial direction of the shield frame 1, and the gap between these front and rear brushes is filled with a water-stop filler (first (see figure).

According to this configuration, the mesh 10 is clogged with the water-stopping filler and a layer of the filler is formed on the wire brush 6, so that the water-stopping and sealing properties of the wire brush 6 are improved as much as possible.

Therefore, the filler is prevented from flowing out, and its consumption can be significantly reduced. In addition, since the mesh 10 uniformly covers the wire brush 6, the load applied to the wire brush 6 can be dispersed by the mesh 10, and the backfilling material (mortar etc.) injected into the tail void can be Local deformation or inversion of the wire brush 6 due to injection pressure can be prevented.

Further, the mesh 10 does not necessarily have to be continuous in the circumferential direction as in the above embodiment, as long as it is disposed on the wire brush 6 without gaps along its circumferential direction. Therefore, as shown in FIG. 6, meshes 10 of an appropriate length may be placed on a wire brush in a mutually wrapped state.

In summary, the present invention provides the following excellent effects.

Since the mesh is provided to cover the adjacent wire brushes from the base end to the tip end and to continuously cover the entire circumferential surface, gaps are likely to occur not only on the wire brushes but especially between adjacent wire brushes. The clogging effect of the filler in the area is dramatically improved, preventing the filler from flowing out and improving water-stopping properties.

In addition, since the mesh continuously covers the entire circumferential surface of the wire brush, the load applied to the wire brush can be sufficiently dispersed by the mesh, preventing local deformation and reversal of the wire brush, resulting in durability. Improves sex.

Furthermore, since meshes are provided on both the upper and lower surfaces of the wire brush, the outer mesh backs up the clogging effect of the inner mesh, ensuring high water-stopping properties.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a shield tunneling machine, Fig. 2 is an enlarged sectional view showing a conventional tail seal, Fig. 3 is a sectional view taken along the line shown in Fig. 2, and Fig. 4 is a tail seal showing an embodiment of the present invention. FIG. 5 is an exploded sectional view taken from the cross-sectional direction taken along the line in FIG. 4, and FIG. 6 is an exploded sectional view showing another embodiment of the present invention. In the figure, 1 is a shield frame, 2 is a segment, 3 is a tail seal, 6 is a wire brush, 10
is mesh.

Claims (1)

[Scope of utility model registration request] Wire brushes formed into strips are connected to the rear end of the shield frame along the circumferential direction with their ends facing each other, and are arranged in multiple stages at appropriate intervals in the axial direction. In the tail seal of a shield excavator, which fills a water-stop filler between wire brushes spaced apart in the direction, it covers both the upper and lower sides of the wire brush from the base end to the tip end, and also covers the entire circumferential surface of the adjacent wire brush. A tail seal for a shield excavator, characterized by having a mesh provided so as to cover it continuously.