JP2659803B2 - Backfilling device for shield excavator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a back-filling injection device for injecting a two-pack type (material solution and hardener solution) filler into a tail void behind a tail seal of a shield excavator. It is about.

(Prior Art) A conventional example of shield excavation will be described with reference to FIG.
A plurality of shield jacks (not shown) arranged in the shield body (1) of the shield excavator abut on the front part of the segment (10), and the thrust of the reaction force propels the entire machine, A shield head (not shown) in the front part of the shield body (1) is rotationally driven to excavate the shield, and excavated soil and the like are discharged backward by an earth removal device (not shown), and the rear part of the shield body (1) is excavated. Inside the segment (10) is assembled and sealed by the tail seal (2) on the inner periphery of the tail end of the shield body (1),
Tail seal (2) Between rear surface of segment (10) and ground (g), feed pipe (3) with injection valve (4), grout hole of segment (10) (for back filling) (10a ), The filler material solution (a) and the curing agent solution (b) supplied from the two feed pipes (3) and (3) are simultaneously injected into the injection valve (4) of the special mechanism. This is a back-filling injection device that mixes and injects it through the grout hole (10a).

As shown in FIGS. 5 and 6, a pair of feed pipes (5a) and (5b) for the material solution (a) and the hardener solution (b) are connected from the inside to the outside of the shield body (1). Injection valve (6) disposed rearward and inserted on the inner end side of the feed pipe (5a) (5b)
(6) is opened and closed, and the material solution (a) and the curing agent solution (b) are injected into the tail void (c) on the rear side of the tail seal (2) by the feed pipes (5a) and (5b), and mixed in the tail void. , A back-filling device for consolidation.

(Problem to be Solved by the Invention) In the conventional back-filling injection device, the back-filling injection device shown in FIG. 4 removes the filler from the tail seal (2) as shown in FIG. Began to inject,
The filling of the tail void portion from the rear side of the tail seal becomes insufficient, so that excavation and filling material injection do not proceed at the same time, resulting in poor work efficiency. 5 and 6, the filling material can be directly injected into the tail void portion. However, since the two solutions are mixed in the tail void portion, the mixing is apt to occur and an uncured portion is formed, and the filling work is performed. Cause a decrease in sex,
In both of the above devices, when the injection is stopped or the like, the filling material or the like is likely to flow backward in the pipe due to the water pressure on the ground side, earth pressure, solidify, and is easily blocked, and it takes a lot of trouble and time to release the blockage. There is a problem that a complicated cleaning operation is required.

The present invention has been developed in order to address the above-mentioned problems, and the object thereof is to enhance the mixing and injection performance of the two solutions of the filler, as well as the cleaning performance of the inside of a pipe, etc. It is an object of the present invention to provide a back-filling injection device for a shield excavator, which has improved injection efficiency and reliability and efficiency.

(Means for Solving the Problems) The present invention provides a pair of feed pipes for a filler material solution and a curing agent solution, which are disposed rearward from the inside to the outside of the shield body, and a shield body. Mixing pipes connected to the two openings of the two feed pipes arranged side by side at the tail end to form a mixing area for the two solutions and inject the mixture into the rear side of the tail seal; And a pair of release material spheres that enter and exit the mixing tube from the inside of the shield body via an operating mechanism to open and close the respective openings, and a compressor and a supply pipe that respectively send compressed air into the supply tube. And a pair of release material spheres are held in the vicinity of both openings of both feed pipes from the inside of the shield body via an operating mechanism, and the gap between the release material spheres of the feed pipes By mixing the material radially, the mixing performance can be improved in the mixing area of the mixing tube. In addition, the mixing tube enhances the filling and filling performance of the tail void behind the tail seal. After the filling is completed, the release material spheres are inserted into the mixing pipe by using the compressed air together to discharge the backflow material into both pipes, the solidified material in the mixed part is removed, and the inside of each pipe is removed. Cleaning is easy.

(Operation) A pair of release material spheres are held near both openings of the feed pipes from the inside of the shield body via the operation mechanism, and one of the supply material radiates from the gap between the mixing pipe and the release material sphere. After the material solution is flowed into the mixing tube by the tube, the hardening material solution is flowed by the other feeding tube and mixed with the material solution, and after the two solutions are effectively mixed in the mixing area in the mixing tube, The mixing pipe directly injects and fills into the tail void behind the tail seal and solidifies.Injection and filling are performed efficiently and smoothly in response to shield excavation, and there is almost no variation in filling work. .

The release material spheres are smoothly slid by preventing the adhesion of the filler and the like, and by using the compressed air together, the backflow liquid is effectively discharged into both the feed pipes, and the clogging is prevented, and
Cleaning is easy.

(Embodiment) FIGS. 1 and 3 show an embodiment of the present invention. In the drawings, (1) is a shield body of a shield excavator, and (2) is an inner circumference of a tail end of a shield body (1). The provided tail seal, (10) is an assembled segment, and is used for a filler material solution (a) and a hardener solution (rearranged from the inside to the back of the shield body (1)). b) and the openings (11a ') and (11b) of the feed pipes (11a) and (11b) arranged side by side at the tail end of the shield body (1). ') And the two solutions (a)
The mixing pipe (12), which forms the mixing area of (b) and is injected into the rear side of the tail seal (2), is inserted into the openings (11a ') and (11b') and operated from within the shield body (1). Mechanism (14
a, 16a) (14b, 16b), a pair of release material spheres (13a, 13b) that move into and out of the mixing pipe (12) through the mixing pipe (12) and squeeze into the feed pipes (11a, 11b) Compressor (2
4) It is a filling and injecting device for a shield excavator equipped with a switching valve (23) and a feed pipe (21A, 21B).

The supply pipe (17a) for the material solution (a) with the injection valve (18a) and the hardener solution with the injection valve (18b) are provided on the inside of the shield body (1) of the feed pipes (11a) and (11b). A supply pipe (17b) for (b) is continuously provided, and a hydraulic jack (16) is connected to each inner end of the supply pipe (11a) (11b) via a communication pipe (15a) (15b).
a) (16b) is provided, and between the hydraulic jacks (16a) (16b) and the spheres (13a) (13b), operation members (14a) (14b) such as steel wires and steel wires are connected. As a result, the spheres (13a) (13b) are closed by the expansion and contraction of the hydraulic jacks (16a) (16b) (closed lines) in the openings (11a ') (11b') shown in FIG. To the open position (dashed line)
The operation mechanism (14a, 16a) (14b, 16b) for opening and closing the opening (11a ') (11b') of the feed pipe (11a) (11b).

The feed pipe (17a) (17b) has a compressor (24)
And a switching valve (23) for supplying compressed air to an arbitrary supply pipe (17a) or (17b).

The spheres (13a) and (13b) are made of ultra-high molecular weight polyethylene,
It is formed of a material with good releasability such as hard nylon and stainless steel to prevent adhesion of fillers, etc., and feed pipe (11a) (1
The two liquids (a) and (b) are formed in a smaller diameter than in the case of 1b), and the two liquids (a) and (b) are discharged radially to make the sliding smooth.
In a state where b) is arranged at the closed position in the openings (11a ') and (11b'), a mixing area of the filler is ensured in the mixing pipe (12). After filling is completed, the hydraulic jacks (16a) (16b) are slid to the open position, and the supply pipe (17
a) (17b) alternately supplies compressed air to the sphere (13a) (1
3b) is extruded into the mixing tube (12) to remove the consolidated material (25) in the mixing tube (12). The hydraulic jack (16a) (6
b) is removed from the connecting pipes (15a) (15b) with bolts, etc., and the spheres (13a) (13b) are moved inside the feeding pipes (11a) (11b) by operating strips (14a) (14b). The inside and the sphere itself can be washed, and the spheres (13a) and (13b) can be easily inserted and removed.

The mixing pipe (12) is provided with openings (11
a ') A common mixing pipe connected to (11b'), formed into a flat cross section, and smooth entry and exit of the spheres (13a) and (13b), and less affected by earth pressure. The material solution (a) and the curing agent solution (b) flowing from the openings (11a ') and (11b') are effectively mixed and directly mixed into the tail void (c) on the rear side of the tail seal (2). inject.

A supply pipe (19a) with an injection valve (20) for supplying the material solution (a) into a face and a chamber chamber (not shown) at the front is connected to the supply pipe (17a) for the material solution (a). Injection valves (18a) (18b) (20), hydraulic jacks (16a) (16
b) is connected to an appropriate drive controller (not shown) operated by an operator of the shield excavator, and is remotely operated by means such as automatic sequence control by an electric signal;
At least the injection valve (18a) and the hydraulic jack (16a), and the injection valve (18b) and the hydraulic jack (16b) are controlled in series.

The embodiment of the present invention is configured as described above, and the operation thereof will be described in detail. For example, the injection valve (18a) is opened, and the hydraulic valve (16a) and the operating strip (14a) are opened. The sphere (13a) is closed, and at the same time, the injection valve (18b) is opened, and the sphere (13b) is closed via the hydraulic jack (16b) and the operating member (14b).

When both conditions are secured, the material solution (a) and the curing agent solution (b) are fed simultaneously, and the two-pack filler (a, b) is effectively mixed in the mixing pipe (12). Then, it is continuously injected into the tail void, and excellent injection performance is obtained.

After the filling is completed, after closing the injection valve (18a), the hydraulic jack (16a) is extended, and the sphere (13a) is kept in the extended stroke state via the operating strip (14a), and the compressor (24) To send compressed air to the supply pipe (21A), supply pipe (17a), and supply pipe (11a) through the switching valve (23), and the sphere (13a) to the mixing section (12). The backflow hardener solution (b) in the feed pipe (11a) is discharged by extrusion, and the consolidated material (25) is removed. Similarly, after closing the injection valve (18b), the hydraulic jack (16b) is extended, the sphere (13b) is maintained in the extended stroke state via the operating strip (14b), and the compressor (24) is operated. Compressed air is supplied to the feed pipe (21B), the feed pipe (17b), and the feed pipe (11b) through the switching valve (23), and the sphere (13b) is extruded to the mixing section (12). The backflow material solution (a) in the feed pipe (11b) is discharged, and the consolidated material (25) is removed. By performing this operation on both feed pipes, blockage in both feed pipes can be prevented, and the consolidated material (25) in the mixing pipe (12) can be completely removed. Since water and oils are not used, excellent quality can be obtained.

The spheres (13a) and (13b) are freely slid in the feeding pipes (11a) and (11b), so that they can be easily inserted and removed, and the spheres themselves and the spheres themselves can be easily cleaned.

(Effects of the Invention) The present invention has the above-described configuration, and a pair of release material spheres is held at the distal ends of both feed pipes from the inside of the shield body via an operation mechanism. The material solution flows into the mixing pipe from one of the feed pipes, and the curing agent solution flows from the other, and the two solutions of the filler are effectively mixed in the mixing area of the mixing pipe, and then in the tail void behind the tail seal. It is directly injected and filled into the tubing, and the compressed air is used together to extrude both release material spheres into the mixing pipe to prevent the mixing pipe from being clogged, significantly improving the efficiency as well as the filling performance and reliability. Have been.

Although the present invention has been described with reference to the embodiment, the present invention is, of course, not limited to such an embodiment, and various design modifications can be made without departing from the spirit of the present invention. .

[Brief description of the drawings]

1 is a longitudinal sectional view of a main part showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of a feed pipe and a mixing pipe part outside a shield main body, FIG. 3 is a front view of a mixing pipe part, FIG. 4 is a longitudinal sectional view of a main part showing a conventional example, FIG. 5 is a longitudinal sectional view of a main part showing another conventional example, and FIG. 6 is a front view of a tip end portion of a feed pipe in FIG. . 1: Shield body, 2: Tail seal 11a, 11b: Feed pipe, 11a ', 11b': Opening 12: Mixing pipe, 13a, 13b: Release material sphere 14a, 16a-14b, 16b: Operation mechanism 21A , 21B: Feeding pipe, 23: Switching valve 24: Compressor, 25: Consolidation material

Continuing from the front page (72) Kazumi Matsuzaki, Inventor Nippon Telegraph and Telephone Corporation, 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo (72) Inventor Masanobu Kuroiwa 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Stock In company

Claims (1)

(57) [Claims] 1. A pair of feed pipes for a material solution and a curing agent solution of a filler, which are disposed rearward from the inside to the outside of the shield body, and are juxtaposed to a tail end portion of the shield body. A mixing pipe connected to the two openings of the two feed pipes to form a mixing area for the two solutions and to be injected into the rear side of the tail seal; and an operating mechanism inserted into each of the openings and from within the shield body. A pair of mold release material spheres that enter and exit the mixing pipe to open and close the respective openings, a compressor that sends compressed air into the feed pipe, and a feed pipe, respectively. Back injection device of machine.