JPH1037674A - Discharge soil disposal device in small-diameter pipe jack method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an epoch-making discharge soil disposal device performing water treatment in a small-diameter pipe jack method. SOLUTION: The small-diameter pipe jack method buries a small-diameter pipe 14 by thrust force of a jack 13 set in an excavation vertical shaft 12. In this case, excavated discharge soil discharged form the jack 13 is collected to the ground E with a pump 15, after muddy water is deposited and separated in a circulation tank 16, separation water falls on the soil discharge part of the jack 13, and excavated soil from the excavator 13 is made slurry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil discharging apparatus for pumping earth and sand discharged from a propulsion machine to the ground in a small-diameter propulsion method used for burying a sewer pipe or the like.

[0002]

2. Description of the Related Art In sewage pipe construction, when a small-diameter PVC pipe is buried in a narrow place where houses are densely packed, a small-diameter propulsion method is used instead of the conventional excavation method. Was.

[0003] In this small-diameter propulsion method, a propulsion device is installed in a starting shaft having a diameter of about 2 m, and a lateral hole is excavated by a front pipe, and a PVC pipe, a fume pipe, and the like are successively provided between the front pipe and the propulsion body. This is a construction method in which small diameter pipes are added, and when the leading pipe reaches the reaching pit, the leading pipe and the auger head are collected from the reaching pit, and a small diameter pipe is buried between the starting shaft and the reaching pit. .

[0004] In such a small-diameter propulsion method, the earth and sand excavated by the auger head at the tip of the leading conduit must be discharged. It is as low as about 1 ton per hour. Also, due to the small shaft diameter,
As shown in FIG. 9, if the water is discharged into the receiving bucket 3 installed under the guide frame 2 of the propulsion unit 1 and a certain amount is accumulated in the receiving bucket 3, the pipe 4 such as a PVC pipe is carried into the shaft 5. Prior to that, the receiving bucket 3 was raised to the ground, and was discharged as it was.

[0005]

However, in the discharging operation using the receiving bucket, the worker is once lifted from the shaft to the ground and then lifted up by a crane or the like. bad. Further, if the work of lifting the receiving bucket is performed while the worker is left in the shaft, safety is deteriorated.

Therefore, as seen in the shield method,
It was desired to adopt a method of continuously pumping excavated earth and sand.However, the small-diameter propulsion method was originally developed as an alternative to the open-cut method, and a method of performing water treatment and pumping it to the ground as muddy water was adopted. It has not been. In addition, the small-diameter propulsion method is a method that secures only a space for installing a propulsion device in a small-diameter shaft, and thus has a drawback that there is no space for installing a large-sized pump. Furthermore, the muddy water that has been pumped is currently discarded as it is, but if it is discarded in this way, the environment deteriorates and it cannot be said that it is a preferable construction method.

[0007] In view of the above, an object of the present invention is to provide an epoch-making earth-treating apparatus that performs water treatment even in a small-diameter propulsion method.

[0008]

Means for Solving the Problems To achieve the above object, the present inventor has proposed a small-diameter propulsion method in which a small-diameter pipe is buried by the propulsion of a propulsion device installed in the start shaft, and The abandonment bucket has been abolished, and an earth removal system has been developed to continuously recover the excavated earth and sand discharged from the propulsion unit to the ground by a pump.

In this case, the small-diameter pipe to be buried is:
It can be applied to various small-diameter pipes such as PVC pipes, fume pipes, steel pipes, and ceramic pipes. The pump is a sand pump,
Any type such as a vacuum pump and a submersible pump may be used, and the installation location is not limited to the ground, and may be in a shaft.

However, when the pump is installed in the shaft, the shaft for small-diameter propulsion has a shaft diameter suitable for the installation space of the propulsion device, and since there is a guide frame for guiding the main body in the direction of propulsion, In a shaft with a circular or elliptical cross section, it is limited to a small space between the side of the guide frame and the wall of the shaft. Therefore, the size of the pump is also limited to that which can be installed in this space. Further, since rainwater or the like accumulates in the shaft, it is desired to employ a small submersible pump in terms of pump performance.

Depending on the excavated soil, there are various types of excavated soil, such as a sediment-only component, a stagnant sand layer, and a gravel-mixed soil layer. It is desirable to slurry as an aqueous suspension in which the solid precipitates easily and pump it up.
Therefore, if a configuration in which a water supply device for treating soil and water is installed is adopted, slurryed muddy water can be pumped.

Further, if the slurry muddy water or soil is pumped to the ground and then discarded as it is, there is a concern about environmental pollution. At the same time as the treatment, it is desirable to use the separated water again for slurrying the excavated earth and sand. Therefore, a configuration in which a circulation tank is installed on the ground and a circulation path is formed between the circulation tank and the earth and sand receiving portion of the propulsion device can be adopted.

In this water supply device or circulation path,
The sediment receiving bucket on the propulsion device side can adopt either a method in which it is installed on the main body of the propulsion device that moves along the guide frame or a method in which the bucket is fixed to the guide frame side.

In the system installed in the main body of the propulsion unit, a casing containing a screw is provided on the pipe receiving side on the propulsion side of the main body of the propulsion unit, so that excavated earth and sand is discharged from the rear end side of the casing. . Therefore, a structure may be adopted in which the receiving bucket is fixed to the pipe receiving portion, the forward and backward paths of the circulation tank are connected to the receiving bucket, and the excavated soil is slurried in the bucket. However, since the receiving bucket is of a type that moves together with the main body of the propulsion device, it is necessary to set its height so as not to interfere with the guide frame. Further, since the receiving bucket is of a moving type that follows the movement of the propulsion device body, it is desirable to use a telescopic bellows hose or the like as a hose that forms a water supply device or a circulation path connected to the receiving bucket.

On the other hand, in the method of fixing to the guide frame side, it is installed between the guide frames or on the side of the guide frame. In the method of installing between the guide frames, the propulsion unit moves and moves from the casing. In order to cope with this, it is desired that the gutter has a gutter shape arranged along the length direction of the propulsion device. Moreover, even if the circulation forward path and the return path are connected to this receiving bucket, it is difficult to move the excavated earth and sand to the return path only by hydraulic power. Therefore, it is desirable that the receiving bucket be provided with a conveying screw. Further, in the configuration in which the receiving bucket is arranged on the side of the guide frame, it is desirable that a guide for guiding the discharged earth and sand from the casing on the propulsion device side to the receiving bucket side be provided.

The muddy water or earth and sand slurried in the receiving bucket is pumped into a circulating tank on the ground by a submersible pump or the like installed at the bottom of a shaft, etc., and is separated into mud and moisture. And then discarded, while the water is again supplied to the receiving bucket from the outbound path.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of an earth removal treatment device in a small-diameter propulsion method showing an embodiment of the present invention, and FIG.
FIG. 3 is a plan view showing an arrangement of a propulsion device and a pump in a starting shaft.

As shown in the figure, an earth removal apparatus 1 according to the present invention.
1 is a small-diameter propulsion method in which a small-diameter pipe 14 is buried by a propulsion force of a propulsion device 13 installed in a starting shaft 12, and excavated soil discharged from the propulsion device 13 is discharged to the ground E using a pump 15. After collecting and sedimenting and separating muddy water in the circulation tank 16, the separated water is dropped into a sediment discharge part of the propulsion device 13, and the excavated sediment from the propulsion device 13 is slurried.

The starting shaft 12 has a diameter of about 2 m, such as a circle, an ellipse, or a rectangle, depending on the shape of the propulsion device 13 to be installed.
Its shape varies. The depth of the starting shaft 12 is determined in consideration of the depth of the small-diameter pipe 14 to be buried, the installation height of the propulsion device 13, and the like.

The propulsion unit 13 includes a pair of left and right guide frames 17 installed at the bottom of the starting shaft 12 along the propulsion direction.
And a propulsion unit main body 18 that is guided to move along the guide frame 17, a pipe receiver 19 arranged on the front surface (propulsion side) of the propulsion unit main body, a back surface of the propulsion unit main body 18, and the shaft 1.
And a propulsion jack 21 interposed between the reaction jack 20 and the reaction force receiver 20 installed on the wall surface of the second wall.

Further, although not shown, the propulsion device 13 includes:
As is well known, a rotary blade type auger head attached to the tip of the leading pipe, a screw for discharging excavated earth and sand from the auger head to the starting shaft 12 side, and a casing thereof are provided. The screw is rotated by the rotational driving force from the propulsion unit 13 and is discharged to the shaft 12 side. In addition to the above-described configuration, the propulsion device 13 is provided with a load meter for measuring the propulsion force applied to the small-diameter pipe and a surveying device for confirming whether there is any deviation in the planned pipeline.

The small-diameter pipe 14 has a length of 1 m or 2 m and is connected to a large number of pipes having a diameter of about 200 mm to 400 mm, and is used as a sewer pipe, a protection pipe for a wiring cable, or the like. In the form, a PVC pipe is used. In this embodiment, a PVC pipe is used as the small-diameter pipe, but the present invention is not limited to this, and the present invention can be applied to a fume pipe or the like.

As is well known, the work of burying these small-diameter pipes 14 is performed by mounting the propulsion unit main body 18 in the starting shaft 12 and attaching the leading conduit to the pipe receiver 19 of the propulsion unit main body 18. The propulsion advances the leading conduit horizontally from the wall of the shaft 12. Next, the leading conduit and the propulsion unit main body 18 are separated, and the propulsion unit main body 18 is retracted.
A small-diameter pipe 14 in which a casing and a screw are set is interposed between the small-diameter pipe 8 and the front pipe, and the propulsion force applied to the casing advances the front pipe so that the small-diameter pipe 14
Will be promoted sequentially. When the small-diameter pipe 14 has been propelled by the length, the small-diameter pipe 14 and the propulsion unit main body 18 are separated, the main body 18 is retracted, a new small-diameter pipe 14 is connected, and the above operation is sequentially repeated.

When the leading conduit reaches the reaching shaft, the auger head and the leading conduit are recovered from the reaching shaft, and the screw casing is withdrawn to the starting shaft. As a result, only the small diameter pipe 14 remains in the ground, and the small diameter pipe is buried.

As described above, the propulsion operation by the propulsion device 13 is performed. However, since this propulsion operation is a well-known matter, further details will be omitted, and then the earth discharging apparatus 11 according to the present invention will be described. It will be described in detail.

The earth removal treatment device 11 collects the excavated earth removed from the propulsion device 13 on the ground E using the pump 15,
After the sedimentation and separation of the muddy water in the circulation tank 16, the separated water is dropped to the earth and sand discharge part of the propulsion device 13, and the circulation path 23 is included to slurry the excavated earth and sand from the propulsion device 13.

The circulation path 23 is connected to the pipe receiver 1 of the propulsion unit main body 18.
9 and a circulation tank 16 installed on the ground E, and a pump 15 is interposed in a forward path 23 a from the reception bucket 24 to the circulation tank 16. In addition, a treatment tank 26 and a dehydrator 27 for mixing the muddy water separated from the circulation tank 16 with the treatment agent to cause coagulation and sedimentation are provided below the circulation tank 16.

FIG. 3 is a cross-sectional view of a receiving bucket installed in the pipe receiver 19 of the propulsion unit main body 18, and FIG. 4 is a plan view of the same. As shown in the figure, the receiving bucket 24 is an open-top box, and the front wall thereof is
An inclined plate-shaped sediment receiver 29 for temporarily buffering the fall of excavated earth and sand discharged from the casing in the small-diameter pipe 14 is fixed to the inside of the small-diameter pipe 14 by bolts 28 and fixed to the inside front side. The connection port 30 of the return path 23b of the circulation path 23 is formed so that the circulating water is supplied and jetted below the sediment receiver 29, and the connection port of the outward path 23a of the circulation path 23 is formed at the rear of the receiving bucket 24. 31 are formed.

The receiving bucket 24 is disposed between a pair of guide frames. Since the distance between the thruster main body 18 and the installation surface of the guide frame 15 is approximately 200 mm, the receiving bucket 24 is formed thinner than this. It is set so as not to hinder the movement of the propulsion unit itself. Further, as shown in FIG. 5, the hose of the outgoing path 23a connected to the connection port 31 of the receiving bucket 24 is connected to the guide frame 1 of the shaft 12.
7 is connected to a storage tank 33 installed on the side.

FIG. 6 is a configuration diagram of the circulation path 23 including the storage tank 33. In this circulation path 23, a submersible pump 15 is installed in the storage tank 33,
Since the storage tank 33 containing 5 is installed between the wall surface of the shaft 12 and the guide frame 17, the storage tank 33 having an outer diameter of about 200 mm is used.

As a control mechanism for adjusting the amount of water in the circulation path 23, the water level in the storage tank 33 is detected in order to close the outlet valve V2 of the circulation tank 16 at a certain level or more. A water level detection sensor 35 is provided, while the circulation tank 16 is provided with three water level sensors 36, 37, and 38 according to the level.
At the start of operation, the water amount control in the circulation path 23 is performed when the water treatment valve V1 and the outlet valve V2 of the circulation tank 23 are closed until the water level in the circulation tank 16 reaches L1 and the L1 level is reached. , Water level sensor 36
Causes the submersible pump 15 to operate, and the valve V2
Is released and the circulation operation is started.

Accordingly, water is supplied from the circulation tank 16 to the receiving bucket 24, and the earth and sand discharged from the casing of the propulsion device 13 are mixed to form a slurry. The muddy water is transferred from the submersible pump 15 to the circulation tank 16. In addition, water treatment in the propulsion method becomes possible. In addition, receiving bucket 2
Since sand, stones, and the like are mixed with the muddy water and the like slurried in 4, a separator for removing the sand or stone before pushing it up to the circulation tank 16 can be provided at the upper part of the circulation tank 16. is there.

During this circulating operation, under environmental conditions, such as when soil containing water is carried into the receiving bucket 24 from a stagnant sand layer or the like, water having a capacity equal to or greater than the capacity of the submersible pump is stored in the storage tank 33.
When the water level exceeds L4, the valve V2 is closed and the supply of water to the receiving bucket is stopped. In the circulation tank 16, the mixed water that has returned to the upper portion is allowed to stand still, and only the upper layer of separated water is received and returned to the bucket 24 while sediment components are settled. At this time, when the water level of the circulation tank 16 becomes L3, the lower valve V1 is opened and the water is dropped into the water treatment tank 26 until the water level falls to L2, and water treatment is performed.

As described above, the amount of water can be controlled in the circulation path 23.
If a muddy water treatment device such as the dehydrator 27 is additionally provided, solidification of mud becomes possible, and deterioration of the environment can be prevented.

FIG. 7 is a sectional view showing another embodiment of the receiving bucket, and FIG. 8 is a side view thereof. This receiving bucket 4
1 is a pair of guide frames 1 while the receiving bucket 24 of the above embodiment is fixed to the propulsion device main body side.
It is installed between seven. The receiving bucket 41
Can be arranged on the side of the guide frame 17.

These receiving buckets 41 are arranged along the length direction of the propulsion unit 13 to cope with the change in the position of discharging the soil from the casing due to the movement of the main unit of the propulsion unit. A gutter 42 for collecting the discharged soil at the center side is provided, and a screw conveyor 43 for conveyance is provided at the center of the gutter so as to be rotatable by a motor (not shown), and is excavated in the submersible pump 15 at the rear. Sediment can be transported. A step is formed at an intermediate position of the gutter 42, and a water supply port 44 for slurrying the earth and sand is formed along the step.

Then, the water of the circulation tank 16 is supplied from the return path 23b connected to the side of the receiving bucket 41, and the water spouted from the water supply port 44 mixes with the earth and sand on the gutter surface to form a slurry. Has been.

Therefore, the receiving buckets 24 and 41 can be slurried with earth and sand irrespective of the method of fixing to the propulsion unit or the method of installing the guide frame.

[0039]

As is apparent from the above description, according to the present invention, the method of supplying excavated earth and sand to the slurry and continuously pumping it to the ground is adopted in the small-mouth propulsion method. Easy treatment of muddy water. In addition, since a circulation tank is provided on the ground to separate water from earth and sand and mud, and water is used for the soil discharging process, there is an excellent effect that extremely efficient soil discharging process can be performed.

As the receiving bucket for receiving the sediment discharged from the propulsion device, either a fixed type of the propulsion device main body or a shaft installation method can be adopted, and a small pump is used as a pump for pumping the slurried sediment. Can be installed in a shaft, and if a submersible pump is used,
There is an effect that it can cope sufficiently even in an environment where rainwater or the like easily accumulates.

[Brief description of the drawings]

FIG. 1 is a conceptual view of an earth removal apparatus in a small-diameter propulsion method showing an embodiment of the present invention.

FIG. 2 is a plan view showing the arrangement of a propulsion unit and a pump in a starting shaft.

FIG. 3 is a sectional view of a receiving bucket.

FIG. 4 is a plan view of the same.

FIG. 5 is a diagram showing a return path of a circulation path.

FIG. 6 is a diagram showing the entire circuit.

FIG. 7 is a cross-sectional view showing another embodiment of the receiving bucket.

FIG. 8 is a side view of the same.

FIG. 9 is an installation diagram of a conventional receiving bucket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Earth removal processing apparatus 12 Starting shaft 13 Propulsion machine 14 Small diameter pipe 15 Submersible pump 16 Circulation tank 24 Receiving bucket 41 Receiving bucket

Claims (6)

[Claims] 1. A small-diameter propulsion method in which a small-diameter pipe is buried by a propulsion force of a propulsion device installed in a starting shaft.
An earth removal device that slurries earth and sand discharged from the propulsion unit and collects it on the ground using a pump. 2. The method according to claim 1, wherein the sediment slurried on the ground is settled and separated in a circulation tank, and the separated water is dropped into a sediment discharge part of the propulsion device to be used for slurrying the discharged sediment. Disposal equipment. 3. A receiving bucket for receiving discharged earth and sand transferred and discharged through the small-diameter pipe between a pipe receiver of the main body of the propulsion device and a small-diameter pipe disposed on the propulsion side thereof. 3. The apparatus according to claim 1, wherein a water supply port is connected to the receiving bucket. 4. A receiving bucket is provided at the bottom of the starting shaft, and a screw conveyor for transferring discharged earth and sand to the rear side of the propulsion device is provided in the receiving bucket.
Or the earth removal treatment device according to 2. 5. The apparatus according to claim 1, wherein the pump is a submersible pump that can be installed at the bottom of a starting shaft. 6. The apparatus according to claim 5, wherein the underwater pump is sized to be installed in a side space of a guide frame at a bottom of a starting shaft.