JP2991420B2 - Backing material supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing material supply device for injecting a backing material in shield work.

[0002]

2. Description of the Related Art In shield construction, as is well known, a cavity (tail void) between a segment and a ground is known.
A backing material is injected into the base to prevent the surrounding ground from being deformed.

The backing material is usually composed of a mortar-based material and is a self-hardening liquid. In order to accelerate the curing of the mortar-based material as a main material, a hardening accelerator is added as an auxiliary material. That is being done.

[0004] By the way, the hardening accelerator as an auxiliary material does not harden itself, but the mortar-based material as the main material is not cured even if the hardening accelerator as an auxiliary material is added. Will cure.

FIGS. 4 and 5 show a conventional backing material supply apparatus. In the example of FIG. 4, a backing material injection plant 20 is provided outside a tunnel T to feed a main material made of a mortar material. A main material pump 23 is provided in a pipe 21, and an auxiliary material pump 24 is provided in a pipe 22 for sending an auxiliary material as a hardening accelerator, and the two pipes 21 and 22 are connected in a mixer 25 to inject a backing material. Like that.

In the example shown in FIG. 5, a backing material injection plant 20 is provided in the tunnel T. In the example of FIG. 4, when the main material pipe 21 is washed after the backing material is injected, if the tunnel excavation advances and the pipe length becomes longer, the amount of the main material to be discarded at the time of cleaning increases, which is uneconomical.

[0007] Also, when refilling the backing material after cleaning, it is necessary to fill the inside of the pipe with the main material, and it takes time to refill.

Further, when the length of the pipe is long, there is a high possibility that the main material hardens in the pipe when the injection is stopped, and adheres to the inner surface of the pipe to reduce the diameter of the pipe.

The example of FIG. 5 does not have the above-mentioned problems of the example of FIG. 4, but requires only the space of the backing material injection plant in the downhole, so that only a shield having a large cross section is possible.

Further, it is necessary to transport the backing material to an underground plant, which increases the transport amount of underground transportation.

[0011]

Conventionally, many examples shown in FIG. 4 have been adopted. In the present invention, a backing material injection plant is provided outside a tunnel. Nevertheless, when cleaning the piping after filling the backing material, disposal of the backing material can be minimized, and when resuming backfilling after cleaning, it is necessary to refill the backing material substantially It is another object of the present invention to provide an apparatus for supplying a backing material in which the backing material does not adhere to the inner surface of the pipe and does not cause a problem of reducing the pipe diameter.

[0012]

The backing material supply device of the present invention has a base end connected to a backing material injection plant, a backing material supply pump provided near the backing material injection plant, A pipe to the inlet, a first circulation switching valve near the backing material supply pump and downstream of the pipe, and a second circulation switching valve near the tip of the pipe. Providing the first
And a second circulation switching valve is connected by a circulation pipe, a circulation pump is provided in the circulation pipe, and a supply is supplied to the pipe near the second circulation switching valve and downstream of the second circulation switching valve via a cleaning switching valve. Provide a washing pump to the water source, when filling the backing material, activate the backing material supply pump, stop the cleaning pump, perform the backing material injection, and switch the circulation switching valve and the cleaning switching valve during cleaning. The backing material supply pump is stopped, the circulation pump and the cleaning pump are operated, the backing material is circulated through the circulation pipe, and the pipe below the cleaning switching valve is cleaned.

In the above-mentioned backing material supply device,
A first circulation switching valve provided near and downstream of the backing material supply pump of the pipe and a circulation pump provided in the circulation pipe are omitted, and the circulation pipe is connected to the backing material injection plant, and the backing material is connected. The backing material can be circulated through the circulation pipe by the supply pump.

Further, in the backing material supply device, a circulation pump may be provided in the circulation pipe, and the backing material may be circulated through the circulation pipe by the circulation pump.

In each case, an auxiliary material supply pump is provided, and a pipe for supplying an auxiliary material for accelerating the curing of the backing material is provided. It is also adopted that an auxiliary material is added to the backing material as a main material in connection with the backing material to promote the curing of the backing material. When cleaning the piping after filling the backing material, use a circulation pump or backing material supply pump.
The backing material is circulated through the circulation pipe. The backing material is fluidized by circulation and prevents the self-hardening backing material from hardening in the pipe.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention, where T is a starting shaft, T-1 is a tunnel, M is a shield machine and is made of a mortar-based material and has a self-hardening backing. A backing material injection plant 1 for blending, kneading and storing a hardening accelerator (auxiliary material) for accelerating the hardening of the material (main material) and the self-hardening backing material is provided on the ground G outside the tunnel T-1. Have been.

A base end of a main material pipe 2 is connected to the backing material injection plant 1, and a backing material supply pump 3 is provided near the backing material injection plant 1 of the pipe 2. The leading end of the main material pipe 2 reaches the inlet.

A first circulation switching valve 4 is provided near and downstream of the backing material supply pump 3 of the main pipe 2, and a second circulation switching valve 5 is provided near the tip of the pipe 2. , The first
The second circulation switching valves 4 and 5 are connected by a circulation pipe 6, and a circulation pump 7 is provided in the circulation pipe 6.

A cleaning pump 9 is provided near the second circulation switching valve 5 of the main material pipe 2 and downstream of the second circulation switching valve 5 to a water supply source via a cleaning switching valve 8.

Further, in the illustrated example, the base end is connected to the backing material injection plant 1 and an auxiliary material supply pump 11 is provided near the backing material injection plant 1 so as to cure the backing material. A pipe 10 is provided for sending the aid to be promoted. The tip of the pipe 10 is connected to the main pipe 2 via a mixer 12 near the cleaning switching valve 8 and downstream of the cleaning switching valve 8.

A backing material as a main material and a curing accelerator as an auxiliary material are mixed in a mixer 12 and back-filled through a pipe 13. When the backing material is immediate hard, the backing material is injected through the pipe 14 without mixing the auxiliary material.

When filling the backing material, the backing material supply pump 3 is operated, the cleaning pump 9 is stopped, and the backing material is injected. The flow of the liquid at that time is A → A → A shown in FIG.

At the time of cleaning, the circulation switching valves 4, 5 and the cleaning switching valve 8 are switched, and the backing material supply pump 3 is stopped.
The circulating pump 7 and the cleaning pump 9 are operated to circulate the backing material through the circulating pipe 6, and the pipe 1 below the cleaning switching valve 8.
Washing of 3 and 14 is performed. At this time, the tip of the pipe is separated from the injection port so that the cleaning liquid does not flow into the tail void.
The flow of the liquid at that time is B → B and C → C shown in FIG.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, in the backing material supply apparatus of the first embodiment, the backing material supply pump 3 of the main material pipe 2 is used. The first circulation switching valve 4 provided nearby and downstream therefrom is omitted, the circulation pipe 6 is connected to the backing material injection plant 1, and the backing material is circulated by the circulation pump 7 of the circulation pipe 6. Also circulate through.

In the second embodiment, the circulation pump 7 provided in the circulation pipe 6 may be omitted, and the backing material may be circulated through the circulation pipe 6 by the backing material supply pump 3.

The flow of the liquid when the backing material is injected is indicated by A in FIG.
→ A → A, and the flow of the liquid at the time of cleaning is B → B and C → C shown in FIG.

In the first and second embodiments, the main pipe 2 and the circulation pipe 6 may be of a double pipe type as shown in FIG.

[0028]

According to the present invention, the self-hardening backing material is constantly flowing in the pipe not only at the time of filling the backing material but also at the time of cleaning, so that the following effects are obtained. (A) It does not harden in the pipe and does not adhere to the inner surface of the pipe to cause a disadvantage that the pipe diameter is reduced. (B) Only the short piping section on the machine side is cleaned, and the cleaning section is greatly reduced.

(C) The amount of backing material discarded during cleaning is greatly reduced. (D) When refilling the backing material after cleaning, refilling of the backing material is unnecessary, and the backing material can be injected immediately.

[Brief description of the drawings]

FIG. 1 is a piping diagram of a backing material supply device according to a first embodiment of the present invention.

FIG. 2 is a piping diagram of the backing material supply device according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a double pipe type pipe.

FIG. 4 is a piping diagram of a conventional backing material supply device in which a backing material injection plant is provided outside a mine.

FIG. 5 is a piping diagram of a conventional backing material supply device provided with a backing material injection plant in a pit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Backing material injection plant 2 ... Main material piping 3 ... Main material pump 4 ... 1st circulation switching valve 5 ... 2nd circulation switching valve 6 ... Circulation piping 7 ...・ Circulation pump 8 ・ ・ ・ Cleaning switching valve 9 ・ ・ ・ Cleaning pump 10 ・ ・ ・ Auxiliary material pipe 11 ・ ・ ・ Auxiliary material pump 12 ・ ・ ・ Mixer 13 ・ ・ ・ Injection pipe 14 ・ ・ ・ Injection pipe

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 11/00 B08B 9/02

Claims (6)

(57) [Claims] 1. Connecting a base end to a backing material injection plant, providing a backing material supply pump near the backing material injection plant,
A pipe is provided at the tip end to the inlet, and a first circulation switching valve is provided near and downstream of the backing material supply pump of the pipe, and a second circulation switching valve is provided near the tip of the pipe. And a circulation pipe is connected between the first and second circulation switching valves, a circulation pump is provided in the circulation pipe, and washing is performed near the second circulation switching valve on the piping and downstream therefrom. Provide a cleaning pump to the water supply source via the switching valve, when filling the backing material, activate the backing material supply pump, stop the cleaning pump,
Perform backing material injection, at the time of washing, switch each of the circulation switching valve and the washing switching valve, stop the backing material supply pump, operate the circulation pump and the washing pump, circulate the backing material through the circulation pipe, A backing material supply device characterized in that a pipe below a cleaning switching valve is cleaned. 2. The base end is connected to a backing material injection plant,
An auxiliary material supply pump is provided near the backing material injection plant, and a tip of a pipe for feeding an auxiliary material that promotes curing of the backing material is disposed near the cleaning switching valve and downstream of the cleaning switching valve. The backing material supply device according to claim 1, wherein the backing material supply device is connected to a backing material piping via a mixer. 3. A backing material supply pump, wherein the base end is connected to a backing material injection plant, and a backing material supply pump is provided near the backing material injection plant.
A pipe is provided at the tip end to the inlet, a circulation switching valve is provided near the tip of the pipe, a circulation pipe is connected between the circulation switching valve and the backing material injection plant, and a circulation switching valve of the pipe is provided. A cleaning pump is provided near and downstream from the water supply source via a cleaning switching valve, and at the time of filling the backing material, the backing material supply pump is operated, the cleaning pump is stopped, and the backing material is injected. During cleaning, the circulation switching valve and the cleaning switching valve are switched, the backing material supply pump and the cleaning pump are operated, the backing material is circulated through the circulation pipe, and the pipe below the cleaning switching valve is cleaned. A backing material supply device, comprising: 4. A circulating pump is provided in the circulating pipe, a backing material supply pump is operated when the backing material is injected, the cleaning pump is stopped, and the backing material is injected. Switching the valve, stopping the backing material supply pump, activating the circulation pump and the cleaning pump, circulating the backing material through the circulation pipe, and cleaning the pipe below the cleaning switching valve. 4. The backing material supply device according to claim 3, wherein the backing material is supplied. 5. The base end is connected to a backing material injection plant,
An auxiliary material supply pump is provided near the backing material injection plant, and a tip of a pipe for feeding an auxiliary material that promotes curing of the backing material is disposed near the cleaning switching valve and downstream of the cleaning switching valve. The backing material supply device according to claim 3, wherein the backing material supply device is connected to a pipe of the backing material. 6. The back end is connected to a backing material injection plant,
An auxiliary material supply pump is provided near the backing material injection plant, and a tip of a pipe for feeding an auxiliary material that promotes curing of the backing material is disposed near the cleaning switching valve and downstream of the cleaning switching valve. The backing material supply device according to claim 4, wherein the backing material supply device is connected to a pipe of the backing material.