JPH06100075B2 - Exhaust method for excavated soil in the propulsion method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for discharging excavated soil in a propulsion method.

(Prior art) The propulsion method is one of the methods of burying sewer pipes underground. The propulsion method is to first dig a starting shaft and lower a pre-made steel pipe or fume pipe inside the starting shaft, press this pipe almost horizontally into the ground by the jacking force, and thus bury the pipe underground. Is the way. Premade steel or fume tubes are called propulsion tubes. In the propulsion method, most of the work is done under the ground, and only starting shafts or reaching shafts appear here and there on the ground, so there is less disruption of traffic and generally less pollution of construction. It is widely used for burying sewer pipes in the city.

When burying a propulsion pipe with a diameter of several centimeters or more, excavate the ground located at the tip of the propulsion pipe to expel it and discharge the excavated earth and sand from the propulsion pipe to the outside. Required to do. Therefore, until now, sediment was transported by trolleys or belt conveyors in the propulsion pipes. In addition, sediment was transported by pipes as sludge. However, transportation by these methods has various drawbacks.

The drawbacks are as follows. First of all, in the method of using the truck, the person will move the truck, but since the propulsion pipe is narrow and the visibility is poor, the work is dangerous and difficult, and it is troublesome to pull the sand from the shaft. I need
Therefore, it was not possible to efficiently discharge the earth and sand, and the propulsion pipe could not be continuously propelled, so that the pipe could not be propelled efficiently. Next, in the method using the belt conveyor, since it is expensive to install the belt conveyor and the belt conveyor occupies a large area in the pipe, it is difficult to move in and out of the pipe, and the belt is accompanied by the promotion of the pipe. There was also difficulty in moving the conveyor, and eventually it was not possible to efficiently discharge the earth and sand and proceed with the propulsion work. In addition, the method of using sludge requires mud liquid in order to convert excavated sediment into sludge, and it is necessary to supply a large amount of mud liquid, which is more than twice the amount of cutting sediment, and therefore several times the amount of cutting sediment. The sludge had to be discharged, and not only could the soil and sand be discharged efficiently, but the discharged sludge had to be dehydrated and discarded, so it was not easy to dispose of it. was there.

(Problems to be Solved by the Invention) The present invention improves the drawbacks associated with the conventional methods as described above,
It was made to provide a method for easily discharging the earth and sand excavated in the propulsion method from the propulsion pipe to the starting shaft.

(Means for Solving the Problem) According to the present invention, a suction hose is arranged in a propulsion pipe, and air in the propulsion pipe is absorbed in the hose to generate an air flow flowing to a starting shaft, and excavated into a small piece or The main idea is to put small particles of sand in a solid state on this air flow and move it to the shaft.

That is, the present invention is a propulsion method in which a tip conduit is inserted into the ground from a starting shaft and the propulsion pipe is buried after the advancing, and a suction hose is installed in the propulsion pipe, and the tip of the suction hose is attached to the propulsion pipe. The tip of the suction hose is opened, and the rear end of the suction hose is used to suck air, and the air in the propulsion pipe is absorbed from the opening in the suction hose to create an air flow that flows to the back end of the suction hose. The opening is directed to the earth and sand excavated by the leading conduit, the earth and sand is placed on the air flow, and the solid is moved to the start shaft, and the excavated earth and sand is discharged from the propulsion pipe. The method of discharge is the main point.

(Embodiment) The following will explain one embodiment of the present invention with reference to the drawings. FIG. 1 is a vertical sectional view of the ground showing a model of the method of the present invention. FIG. 2 is a partially cutaway perspective view of the tip end waving in FIG. Figure 3 shows
FIG. 2 is a partially cutaway perspective view of the equipment in which the rear end in FIG. FIG. 4 is a model diagram for explaining the operation of the equipment shown in FIG. FIG. 5 is a perspective view of another equipment in which the rear end of the suction hose is provided on the crocodile.

In FIGS. 1 and 2, “a” represents a front conduit, “b” represents a propulsion pipe, and “c” represents a starting shaft. The tip conduit a is
The front ground is excavated by the cutter bit 1 provided at the tip, and the solid earth and sand 2 which is excavated and made into small pieces or small particles is sent backward by the screw conveyor 3 and deposited in the box 4 in the solid state. The accumulated sand 2 is sieved by a net 5, and only small particles are sent backward. The propulsion pipe b is made of iron, concrete, or the like and is propelled toward the tip by the propulsive force of the jack 6 installed in the starting shaft c. In this way, the propulsion pipe b is press-fitted into the ground and successively buried underground.

A suction hose x is installed in the propulsion pipe b. The suction hose x may be made of a hard material, such as an iron pipe, but is preferably made of a soft material, for example, made of a flexible synthetic resin, It is like a suction hose used in vacuum cleaners.
A wire made of a hard material is helically attached to the hose wall to reinforce it, and it is preferable that the hose wall is entirely transparent or semitransparent. For example, a hose sold under the trade name of Canada Inn by Totoku Kogyo Co., Ltd. is suitable. The suitable inner diameter of the suction hose x is 100 to 150 mm. Suction hose x is 40
It can be extended over a length of 0 mm.

The end of the suction hose x is open at the end of the propulsion tube. Also, the rear end of the suction hose x sucks air. In this way, inside the suction hose x, an air flow that absorbs the air in the propulsion pipe from the tip opening and flows to the rear end is generated, and the air flow is directed in the direction of arrow y. The arrow y extends from the leading conduit a toward the starting shaft c. This air flow is
The rear end of the suction hose x is connected to the receiver tank d, further connected to the blower e, and suctioned by the blower e.

The tip opening of the suction hose x faces the inside of the box 4 and is placed toward the solid soil 2 accumulated through the rope 5 to
It is located where you can inhale. The rope 5 is attached to select only small-sized earth and sand that can freely pass through the suction hose x. The small particles have a particle diameter of about ⅔ or less, preferably half or less of the inner diameter of the suction hose x. The earth and sand that have passed through the rope 5 ride on the independent air flow that flows in the suction hose, and the starting shaft c is moved to the sea. Thus, the excavated earth and sand is discharged from the propulsion pipe b.

The equipment for producing an air flow in the suction hose x is shown in FIG. In FIG. 3, the rear end of the suction hose x is divided into two parts through a switching valve f, enters into separate receiver tanks d, and then enters a switching valve f ′ and merges, and then passes through a separator g and a blower e. Connected to. In the receiver tank d, the air flow from the suction hose x enters from the lower part of the tank d, swirls along the side wall of the tank d, and then exits from the upper part of the tank. Therefore, the earth and sand carried on the air flow are settled by gravity in the tank d, accumulated in the tank d, and only the air is discharged from the upper part of the tank. However,
The fine sediment particles may not be deposited in the tank and may be further carried by the air flow and discharged from the upper part of the tank.

Therefore, in order to prevent fine sediment particles from entering the blower e, a separator g is attached. The separator g serves to separate fine particles from the air based on the cyclone principle. As shown in FIG. 4, in the initial separator g ₁ , dust having a slightly larger particle size among the fine particles is first settled and removed by the cyclone, and then the air flow is separated in the separator g ₂ . Dust with a small particle size is removed by passing it through water, then vacuum suction is performed by Roots blower e, and finally, in the separator g ₃ , residual dust is further removed and the sound is muffled and discharged into the air. It

The switching valves f and f'are provided to continuously discharge the earth and sand. That is, in order to continuously discharge the sediment, two receiver tanks d are provided, and when the sediment accumulated in one of the tanks is taken out, the air is stopped from flowing into that tank, and at the same time to the other tank. Switching valves f and f'are provided for the purpose of flowing air. As a result, the sediment will continue to be discharged even when it is removed from the tank.

As the blower e, for example, a roots blower is used. A roots blower is a blower having a structure in which a plurality of rotary leaves mesh with each other and rotate to generate an air flow. In the present invention, it is desirable to use two roots blowers connected in series to generate a strong air flow. Further, it is preferable to use a roots blower having a structure in which three rotary leaves are engaged with each other. In this invention, the blower e
It is important to use a blower with a large capacity to generate a large capacity, high-velocity airflow in the suction hose x.

The earth and sand 2 excavated by the tip conduit a have various properties depending on the type of ground. When the excavated soil is a large block,
This is crushed and then passed through the suction hose x.
Also, when the excavated earth and sand is clayey and highly sticky, a small amount of water is added to this to reduce the surface viscosity and prevent it from adhering to the inner wall of the suction hose. In this case, the amount of water added should be small and care should be taken not to muddy the soil. This is because the method of the present invention is characterized by pneumatically transporting sediment in a solid state.

The suction hose x can easily be extended if necessary, for example by means of a flange connection or a sleeve connection. When the suction hose x has a length of several meters, install an air cock in the middle. The air cock introduces air from here when necessary, and the suction hose x
It is used to remove the earth and sand adhering to the walls of the.

In FIG. 1, the blower e was placed on the ground, but the blower e
The installation location of is not limited to the ground. The blower e may be installed in the starting shaft c to transport the excavated earth and sand into the shaft. However, in this case, if the earth and sand accumulated in the shaft is to be pulled up to the ground, it will have to be transported again, and the operation will be complicated. In any case, in the present invention, the blower e only needs to be installed at a fixed position behind the suction hose x and does not need to be moved frequently.

The present invention is characterized by transporting the excavated earth and sand in a suction hose together with an air flow in a solid state. Therefore, the earth and sand taken out from the suction hose has a solid state and can be discarded as it is as the remaining soil. This point is a great advantage compared with the sediment that is considered to be sludge. In other words, it is not allowed to discard the sludge that has been treated as dehydrated once it has been dehydrated, and even if the dehydrated substance is discarded, it will be treated as industrial waste, so it will be treated like ordinary sediment. Cannot be easily discarded. However, the earth and sand taken out according to the present invention can be discarded anywhere as it is, which is very advantageous.

In FIG. 1, the excavated earth and sand are once put in the receiver tank d, and then transferred to the dump truck h to be transported, but it is more advantageous to carry out as shown in FIG. 5 than that. . In FIG. 5, the receiver tank d is directly mounted on the dump truck h, the suction hose x is directly connected to the receiver tank d on the dump truck h, and the excavated earth and sand is placed directly on the dump truck h. Dump truck h
The upper receiver tank d has an inlet to be connected to the suction hose x at the lower rear end and an outlet to be connected to the separator g at the upper front. Inside the receiver tank d, only sediment is settled and only air is discharged from the outlet while the air flow swirls along the tank wall. The earth and sand put in the tank d can be discharged by opening the side plate i at the rear end of the tank d and tilting the tank d, if necessary.

INDUSTRIAL APPLICABILITY The method of the present invention can be used for laying a water pipe, an underdrain, a sewer pipe, or the like.

(Effect of the Invention) According to the method of the present invention, the suction hose is installed in the propulsion pipe in the propulsion method, the tip of the suction hose is opened by the tip of the propulsion pipe, and the rear end of the suction hose is blown by air. The suction hose absorbs the air in the propulsion pipe from the opening in the suction hose to generate an air flow that flows to the rear end, and the opening of the suction hose is directed toward the earth and sand excavated by the leading pipe to move the air flow above the air flow. I decided to move it in a solid state by placing it on the
By adjusting the positional relationship between the earth and sand and the opening of the suction hose, an appropriate amount of earth and sand can be carried on the air flow.
Therefore, there is no risk that the suction hose will be clogged with soil, and that since the sand is solid, it can be transported as partial small particles, so there is no risk of it being clogged further, and therefore sand can be transported efficiently and smoothly. . Also,
Since the cut earth and sand is carried through the suction hose,
It is possible to prevent the earth and sand from scattering to the outside of the suction hose, so that it is possible to work without polluting the inside of the propulsion pipe. Further, since the suction hose having a small cross-sectional area is sufficient, it is easy for a person to move in and out of the propulsion pipe, and therefore work is facilitated. Furthermore, since the air inside the propulsion pipe is absorbed from the tip opening of the suction hose and the rear end flows to the wa, the ventilation inside the propulsion pipe is performed naturally, and no special equipment and work are required for ventilation. . Furthermore, since no heavy object is placed in the propulsion pipe other than the suction hose, the jack can facilitate the propulsion. Further, since the suction hose is easily replenished, it is easy to move and connect the suction hose with the propulsion of the pipe, so that the propulsion method can be smoothly advanced. Furthermore, since the discharged soil is in a solid state, it can be used as it is for landfill,
Easy to dispose. The present invention provides many such advantages.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of the ground showing a model of the method of the present invention. FIG. 2 is a partially cutaway perspective view of the tip end waving in FIG. FIG. 3 is a partially cutaway perspective view of the equipment whose rear end is provided on the crocodile in FIG. 1. Figure 4 shows
It is a model figure explaining the effect | action of the equipment shown in FIG. FIG. 5 is a perspective view of another equipment in which the rear end of the suction hose is provided on the crocodile. In the figure, a is a front conduit, b is a propulsion pipe, c is a starting shaft,
d is a receiver tank, e is a blower, and x is a suction hose.

Claims (3)

[Claims] 1. A front conduit is introduced into the ground from a start shaft,
In the propulsion method of burying the propulsion pipe after entering, install a suction hose inside the propulsion pipe, open the tip of the suction hose with the tip of the propulsion pipe, and use the back end of the suction hose to blow air The suction hose absorbs the air in the propulsion pipe from the opening in the suction hose to generate an air flow that flows to the rear end, and directs the opening of the suction hose toward the earth and sand excavated by the leading conduit and put the earth and sand on the air flow. A method for discharging excavated earth and sand in a propulsion method, characterized in that the excavated earth and sand is discharged from the propulsion pipe by moving the starting shaft to the starting shaft in a solid state. 2. The rear end of the suction hose is divided into two parts by passing through a switching valve, the divided suction hoses are connected to different receiver tanks, and the respective suction hoses passing through each receiver tank are connected to the switching valve. The method for discharging excavated earth and sand according to claim 1, characterized in that a separator and a blower are attached to the end of the combined flow to suck air. 3. The receiver tank and the suction hose can be freely attached to and detached from each other, and the receiver tank containing the earth and sand can be carried on a dump truck.
The method for discharging excavated soil according to paragraph.