JPH1082277A - Excavated soil recycling method and device in mud pressure shield method - Google Patents

Abstract

(57) [Summary] [Problem] To reuse excavated earth and sand and secure a work place such as a segment. SOLUTION: A mixer provided on a succeeding bogie (C) through a sediment pressure feed pipe (H1) by a sediment pressure feed pump (3) provided at a discharge port of a screw conveyor (2) of a shield machine (1). Send to (10) and adjust tank (32)
Mixed with the mud from the mud pipe (H2) to which the PAC is added, and the wastewater is discharged from the mud pipe (H3).
Send to 3) to separate and reuse as surplus soil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for recycling excavated soil in a mud pressure shield method.

[0002]

2. Description of the Related Art At present, as a shield method, a mud pressure method and a mud pressure method are mainly used, and these methods are selected in consideration of the ground and the size of a work place.

[0003]

In the mud-soil pressure shield method, excavation and pumping cannot be performed only with earth and sand, so construction is performed by mudging. However, by mudifying, it becomes industrial waste and is reused. Can not do.

[0004] In the earth pressure balanced water-supply type shield method, it is difficult to control the pressurized state of an earth discharging adjustment tank provided at the discharge port of the screw conveyor, and in some cases natural water flows through the screw conveyor to the face, and May collapse.

[0005] In addition, the work space is reduced due to the discharge tank, and it becomes difficult to carry in and assemble the segments.

An object of the present invention is to provide a method and an apparatus for recycling excavated soil in a mud pressure shield construction method capable of reusing excavated earth and sand and securing a work place such as a segment.

[0007]

According to the construction method of the present invention, in a mud pressure shield construction method, a sediment pressure pump is provided at a discharge port of a screw conveyor of a shield machine, and excavated sediment pumped by the soil pressure pump is supplied to a subsequent bogie. The mixing means provided provided mixed with the mud to which the viscosity reducing agent was added from the ground, transported to the ground, and separated from the mud as residual soil by the primary processing equipment of the processing equipment on the ground, and the remaining soil was reused. It is characterized by:

The apparatus according to the present invention comprises a sediment pressure pump provided at a discharge port of a screw conveyor of a mud pressure shield machine, a succeeding truck following the shield machine, and a mixer provided on the subsequent truck. A part connected to the sediment pump by a sediment feeding pipe, a part connected to a regulating tank on the ground by a mud pipe, and a part connected to a treatment plant by a mud pipe, and a drilling tunnel. A hose drum device provided in the inside to extendably support the mud feeding pipe and the exhaust pipe, and a viscosity reducing agent adding means connected to the mud feeding pipe.

Further according to the present invention, the mixer is provided with a flow rate increasing means in a closed circuit.

According to the invention, the mixer is provided with a turbulence generating means in a closed circuit.

According to the invention, the mixer is provided with a stirring means in a closed circuit.

Further according to the present invention, the viscosity reducing agent is PA
It causes electrical neutralization of C (polyaluminum chloride) and the like.

In the present invention configured as described above,
The excavated earth and sand is suitably mixed with the mud in a mixer, and further reduced in viscosity by a viscosity reducing agent. The excavated soil is sent to a processing plant on the ground with high liquid transport efficiency, easily separated from the mud as residual soil, and reused.

Further, the mixer is provided on the succeeding bogie, and the shield machine has a working place for loading and assembling the segments.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a trailing bogie C is movably provided behind a mud pressure shield machine 1 located at the tip of an excavation tunnel T at a predetermined interval D.
At the discharge port of the screw conveyor 2 for carrying out the excavated earth and sand of the shield machine 1, a sediment pressure pump 3 is provided, and the discharge port of the pump 3 is connected to a sediment pressure pipe H1.

The succeeding carriage C is provided with a mixer 10 as a mixing means. The mixer 10 is a closed circuit that is not released to the atmosphere. As shown in FIGS. 2 and 3,
An elbow pipe 12 is connected to the top of the T-shaped main body 11, a straight pipe 13 is connected to the front side, and a nozzle section 14 as a flow rate increasing means is provided at the front inside, and a rear side is provided. Is connected to a venturi tube 15. The elbow pipe 12 is connected to a sediment pressure feeding pipe P1, the straight pipe 13 is connected to a mud feeding pipe H2, and the venturi pipe 15 is connected to a mud discharging pipe H3.

The above-mentioned mud pipe H2 is connected to the shaft V in the tunnel T.
The drainage pipe H3 is connected to an adjustment tank 32 provided on the ground G via a hose drum device 30 provided on the side, and a treatment plant 33 provided above the adjustment tank 22 via a hose drum device 31. It is connected to the. In the vicinity of the outlet of the adjusting tank 22 of the mud pipe H2, a PAC (polyaluminum chloride) used as a viscosity reducing agent is connected through a pipe.
(A substance causing electrical neutralization) is connected to the tank 35. The symbols P1 to P7 in the figure are pumps, and S1 to P7.
S6 is a pump starting device, 36 is a central monitoring room, and 37 is a hose drum control device.

Next, an embodiment of the excavated soil recycling will be described. When the shield machine 1 is excavated, the pumps P1 to P6 are operated to return the muddy water in the adjusting tank 32 from the mud feed pipe H2 to the treatment plant 33 from the mud discharge pipe H3 via the mixer 10 and to operate the pump P7. The PAC of the tank 35 is added to the muddy water. The excavated earth and sand excavated by the excavation is sent to the mixer 10 via the screw conveyor 2 by the earth and sand pump 3 through the earth and sand pump H1.

In the mixer 10, the muddy water from the mud feed pipe H2 is throttled by the nozzle portion 14 to increase the flow velocity, and the excavated sediment from the sediment pressure feed pipe H1 is suitably mixed and decelerated by the Penturi pipe 15. And sent to the sludge pipe H3. In this state,
Mud mixed with earth and sand (hereinafter referred to as mixed mud)
Since the viscosity is reduced by C, the pumps P2 to P6
Thus, the fluid is effectively transported to the processing plant 33.

In the processing plant 33, excavated earth and sand is separated as residual soil from the mixed muddy water by a primary processing machine (not shown). At this time, separation is effectively performed by the added PAC. Then, the separated remaining soil is reused in a known manner.

4 and 5 show another embodiment of the mixer. A pair of elbow pipes 22 eccentric to the left and right are connected to the upper and lower sides of a cylindrical main body 21 of the mixer 20, a straight pipe 23 is connected to the center of the front face, and a straight pipe 24 is connected to a lower part of the rear face. A baffle plate 25 having a cone angle α of 90 degrees, for example, which is a turbulent flow generating means, is provided in the center of the inside. The straight pipe 23 has a sediment pressure feeding pipe H1, the elbow pipe 22 has a mud feeding pipe H2, and the straight pipe 24 has a mud discharging pipe H.
3 are respectively connected. In this embodiment, the excavated earth and sand and the muddy water collide with the baffle plate 25 to generate a turbulent flow, which is suitably mixed, and the liquid transport efficiency is further improved.

FIGS. 6 and 7 show another embodiment of the mixer. Square tube-shaped main body 21A of this mixer 20A
A pair of elbow pipes 22 are connected eccentrically left and right, a straight pipe 23 is connected to the front center, a pair of straight pipes 24 are connected to both lower sides of the rear face, and a cone is connected to the inner center. A baffle plate 26 having an angle β of, for example, 120 degrees is provided, and a stirring blade 28 as stirring means driven by a motor 27 is provided at the rear inside. The straight pipe 23 has a sediment pressure feed pipe H1 and the elbow pipe 22 has a mud feed pipe H2.
4 is connected to a sludge pipe H3. In this embodiment, the excavated earth and sand and the muddy water collide with the baffle plate 26 and are mixed, and are further preferably mixed by the rotating stirring blade 28,
The liquid transport efficiency is further improved.

[0023]

Since the present invention is configured as described above, it has the following effects. (1) The cost can be reduced by reusing excavated soil. (2) A work place for loading and assembling segments in the shield machine can be secured, and workability can be improved. (3) The viscosity reducing agent can lower the viscosity of the mixed mud of excavated soil and mud, improve the liquid transport effect, reduce the transport power, and improve the separability of the residual soil from the mixed mud. (4) If the construction is carried out by the muddy water pressurization method, the muddy water can be lost and the cost can be increased.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a front view showing an example of the mixer of FIG.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a front sectional view showing another example of the mixer.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a front sectional view showing another example of the mixer.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

 C: Subsequent bogie D: Interval G: Above ground H1: Sediment pressure feed pipe H2: Mud pipe H3: Drain pipe P1-P7 ... Pump S1-S6 ... Pump starting device T: Drilling tunnel V: Vertical shaft 1: Mud pressure shield machine 2: Screw conveyor 3: Sediment pressure pump 10, 20, 20A: Mixer 11, 21, 21A ... Main body 12,22 ... Elbow tube 13,23,24 ... Straight tube 14 ... Nozzle part 15 ... Venturi tube 25,26 ... Baffle plate 27 ... Motor 28 ...・ Stirring blades 30, 31 ・ ・ ・ Hose drum device 32 ・ ・ ・ Adjustment tank 33 ・ ・ ・ Treatment plant 34 ・ ・ ・ Piping 35 ・ ・ ・ Tank 36 ・ ・ ・ Central monitoring room 37 ・ ・ ・ Hose drum control device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Ishimaru 1-3-8 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. Tokyo Branch (72) Inventor Katsumi Inomata Moto-Akasaka, Minato-ku, Tokyo 1-3-8 Kashima Kensetsu Tokyo Branch (72) Inventor Tetsuya Sasaki 1-3-8 Moto-Akasaka Minato-ku, Tokyo Kashima Kensetsu Tokyo Branch (72) Inventor Left Note: Kashima Construction Co., Ltd. Tokyo Branch, 1-3-8 Moto-Akasaka, Minato-ku, Tokyo

Claims (6)

[Claims] In the mud pressure shielding method, a sediment pump is provided at a discharge port of a screw conveyor of a shield machine, and excavated sediment pumped by the sediment pump is sent from the ground by mixing means provided on a succeeding bogie. The mud pressure shielding method is characterized in that it is mixed with muddy water to which a viscosity reducing agent has been added, transported to the ground, separated from the muddy water as residual soil by a primary processing machine on the ground, and the residual soil is reused. Excavated soil recycling method. 2. A sediment pressure pump provided at a discharge port of a screw conveyor of a mud pressure shield machine, a trailing truck following the shield machine, and a mixer provided on the trailing truck. Are connected to the sediment pump by a sediment pumping pipe, a part is connected to a regulating tank on the ground by a mud pipe, and a part is connected to a treatment plant by a mud pipe, and provided in a drilling tunnel. An excavated soil recycling apparatus in a mud pressure shield method, comprising: a hose drum device that supports the mud pipe and the mud pipe in a stretchable manner; and a viscosity reducing agent adding means connected to the mud pipe. . 3. The excavated soil recycling apparatus according to claim 2, wherein the mixer is provided with a flow velocity increasing means. 4. The excavated soil recycling apparatus according to claim 2, wherein a turbulence generating means is provided in the mixer. 5. The excavated soil recycling apparatus according to claim 2, wherein a stirring means is provided in the mixer. 6. The excavated soil recycling apparatus according to claim 2, wherein the viscosity reducing agent is PAC (polyaluminum chloride).