JPS62107198A - Auger type small aperture pipe propulsion method and device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an auger-type small diameter pipe propulsion method and apparatus.

In other words, a rotary cutter head excavates a hole in the ground, an auger sends the shear backwards, a leading pipe and a small-diameter pipe connected to it are propelled from the wall of the shaft, and the small-diameter pipe is buried underground. This invention relates to an auger type small diameter pipe propulsion method and its equipment.

In recent years, small diameter pipes such as water supply branch pipes (usually pipe inner diameter 100
The small-diameter pipe propulsion method has become frequently used as a construction method for burying materials (less than 0 m) underground. The reason for this is that the open cut method, which has traditionally been used to bury small-diameter pipes of this kind, in which a trench is dug from the surface of the ground and the pipes are laid, increases traffic volume, and when the pipes are laid, other underground pipes are buried. For example, water pipes, gas pipes, etc. are no longer suitable due to problems such as getting in the way or labor costs.

The present invention relates to an auger-type small-diameter pipe propulsion method and apparatus in which a rotary cutter head is rotated by the rotation of an auger to later transport shear among such small-diameter pipe propulsion methods.

(B) Problems to be Solved by the Prior Art and the Present Invention Incidentally, there are various underground strata, and water-retaining strata are often encountered during construction.

These water-retaining strata are especially common in gravel layers, but
If construction is not carried out while water-sealing in water-retaining strata, the face may collapse and the land may cave in. Several methods have been developed to date to stop water in water-retaining strata.

An object of the present invention is to provide an auger type small-diameter pipe propulsion method and device that has high working efficiency and an excellent water-stopping effect.

(c) Means for solving the problem The auger type small diameter pipe propulsion method of the present invention which achieves the above object has a rotating cutter head for excavating the ground at the tip of the leading pipe to which small diameter pipes can be connected. A casing containing an auger that rotates together with the auger and transports the excavated shear is installed, and the small diameter pipe, auger, and casing are connected one after another as the lead pipe is propelled underground from the shaft wall. In the auger-type small-diameter pipe propulsion method, in which small-diameter pipes are propelled and buried underground, when excavating a water-stagnant stratum, the soil discharge port at the rear end of the last casing is elastically closed, and the auger The rotation of the feed blade forms a shear consolidation water stop wall at the rear of the last casing, and when the sum of the water retention pressure and consolidation force exceeds the closing force of the soil discharge port, the soil discharge port opens and the shear is discharged. It is characterized by

In addition, this device has a casing in which a rotary cutter head for excavating the ground is attached to the tip of the leading pipe to which small-diameter pipes can be connected, and an auger that rotates together with the auger and transports the excavated shear is installed. , a device used in the auger-type small-diameter pipe propulsion method, which connects small-diameter pipes, augers, and casings one after another as the lead pipe is propelled underground from the shaft wall to propel and bury the small-diameter pipes underground. The present invention is characterized in that a soil discharge port is provided at the rear end of the rearmost casing, and the soil discharge port is substantially covered with a resiliently pressable lid.

In addition, in the auger-type small-diameter pipe propulsion method and device of the present invention, if there is gravel in the water-retaining stratum, a crusher for crushing gravel is attached to the rotating cutter head, and the gravel is crushed into fine pieces and sent to the auger. It is characterized by sending.

Furthermore, the auger type small diameter pipe propulsion method and device of the present invention,
It is characterized in that the casing is provided with a slurry introduction part to introduce the slurry into the casing, and a mud compaction mixing water stop wall is formed all the way at one end of the rearmost casing.

(D) Examples Hereinafter, the auger type small diameter pipe propulsion method of the present invention will be explained based on the examples shown in the drawings.

12 and 14 show the overall structure of a device 101.1 for implementing the auger type small diameter pipe propulsion method of the present invention. In the device 101 in FIG. In the device 1 of FIG. 14, which is provided in the axial direction of the shaft,
An earth discharge port 21 is provided in the radial direction with respect to the auger shaft.

As shown in the figure, in any device 101.1, a vertical shaft 3 is dug from the ground surface 2, a device main body 4 is installed, and a leading pipe 5, a casing 6, an auger 7, and a rotating cutter head 8 are attached to this. .

In the example of the drawing, as the excavation of the ground progresses, a small-diameter pipe 9 such as a hump pipe is connected to the leading pipe 5, and the auger 7 and casing 6 are also connected, but when the main body 4 is installed, The pilot tube 5 is attached to the pressure plate 10, and the casing 6 is mounted in the pilot tube 5 with pins 13 via brackets 11,12. 14 is a support leg of the casing 6.

The auger 7 is housed in the casing 6, and is rotated together with the rotary cutter head 8 by rotational drive means such as a motor 16 via a gear 15, thereby transporting shear later. Reference numeral 17 denotes a water supply hole, and water is supplied to the face from the water injection hole 19 of the rotary cutter head 8 through the conduit 18 of the auger 6 during excavation of the clay layer.

Reference numeral 20 denotes a mud introduction part provided in the casing 6, which guides the mud into the casing 6 and forms a watertight wall for consolidating and mixing mud and shear at the rear end of the rearmost casing. It is used and is effective when excavating water-bearing strata with high water levels. (Fig. 14) 121.21 is a soil discharge port provided at the rear end of the rearmost casing 6, and a lid 150.50 substantially covers this. Air cylinder 1
The earth discharge port 121.21 is elastically pressed by a pressing means such as 23.23. Reference numeral 26 denotes an unloaded soil receiver, which is placed on a connecting plate 25 that connects the main body 4 and the pressing plate 10.

As shown in FIGS. 13 and 15, 27 is a hydraulic cylinder for moving the auger shaft back and forth, and a rotary shaft 28 that is connected to the auger, and therefore a rotary cutter attached to the auger 7 and its tip. The head 8 is the piston rod 2
It is moved back and forth by the reciprocating motion of 9.

30 is a hydraulic shirt for propelling the main body, and a reaction force table 3
The tip 33 of the piston rod pushes the reaction force jack 32 attached to the lead pipe 5 , the small diameter pipe 9 connected to the lead pipe 5 , and the casing 6 . , Auger 7, etc. will propel it.

1 to 11 show essential parts for carrying out the auger type small diameter pipe propulsion method of the present invention in an apparatus.

Among these, in the first embodiment shown in FIGS. 1 to 4 and the second embodiment shown in FIGS. 5 and 6, the soil discharge port is provided in the axial direction of the auger shaft.

That is, in the first embodiment, a cylindrical housing 147 is detachably connected to the rear end of the rear casing 6 so as to surround the auger shaft, and this housing 147 is a part of the rear casing 6. It has turned into a The open end of the housing 147 is the soil discharge port 121
The lid 150 is substantially placed over the soil discharge port 121 while being elastically pressed by the air cylinder 123.

1150 is ring-shaped, and the rotating shaft 28 is inserted through this.

Note that 115 is the play for the lid 150 to open and close.
As shown in FIG. 3, clearances are provided between M150 and the rotary shaft 28 and between M150 and the peephole cylinder 135, as shown in FIG. is not closed, but during construction, the shear closes the portion of the soil discharge port 121 that is not covered by W150. Lid 1 like this
Closing of the soil discharge port 121 by 50 is sufficient as long as it is substantially closed enough to form a water-sealing water-sealing wall of shear or a water-sealing water-sealing wall of a mixture of shear and mud as described later.

Therefore, in this first embodiment, the soil discharge port 121 is provided in the axial direction of the auger shaft, and! 150 applies an elastic and substantial closing force to the soil discharge port 121 in the direction in which shear is transferred by the auger's feed blades.

Specifically, the lid] 50 is pivotally attached to one end of a pair of links 125, 125 that swing around pins 124, 124, and the other end of the links 125, 125 is connected to the piston rod 153 of the air cylinder 123. It is pivotally attached to the two-pronged extension end. Therefore, the lid 150 opens and closes as shown by the solid line and the two-dot chain line in FIG. 2 by the reciprocating movement of the piston rod 153.

The air cylinder 123 is placed on a mounting plate 126 fixed on the connecting plate 25, and has a long hole 1 in the mounting plate 126.
The mounting position can be changed by changing the fixing position of the bolt 127 127 within 34.134.

Since the lid 150 is opened and closed by the air cylinder 123, the pressure on the soil discharge port 121 by the lid 150 is elastic, and the closing force can be changed by remote control. In the first embodiment, the pressing force is applied by an air cylinder, but it may be applied by other means that can change the closing force by remote control, such as a hydraulic cylinder or an actuator.

FIG. 4 is an operating circuit diagram of the air cylinder 123, in which 57 is a compressor, 58 is a pressure regulator, 59 is a meter, 60 is a switch, 61 is a speed controller, 12
3 is an air cylinder, and 153 is a piston rod of the air cylinder.

Therefore, the pressure of the air sent from the compressor 57 is detected by the meter 59 and regulated by the pressure regulator 58. When the lid 50 is elastically closed, the switch 60 allows air to flow through the circuit 62, and the speed controller 61 adjusts the flow rate per unit time.
Air is sent inside to push out the rod 153. The excess air pushed by the piston passes through the circuit 63 and is transferred to the switch 6
0 is released into the atmosphere. On the other hand, when opening the lid 50 from the outside, the switch 60 causes air to flow through the circuit 63, and the speed controller 61 adjusts the flow rate per unit time while feeding the air into the cylinder 23.
Return. Excess air pushed by the return of the piston passes through circuit 62 and is discharged to the atmosphere by switch 60.

In addition, in the first embodiment of the drawings, the auger 7 and the rotating! ! Pin 130 for connecting 11128
Windows 128, 128 are formed to facilitate insertion of the cover 132, 132, and covers 132, 132 that open and close around pins 131, 131 are attached to these windows 128, 128. Numeral 133 is a bolt for fixing the cover 132°132. Reference numeral 135 is a tube with a peephole for checking by transit or the like whether the small diameter pipe is buried without deviation during construction.

When carrying out the small-diameter pipe propulsion method using an apparatus having the above structure, when excavating a water-retaining stratum, the earth discharge port 121 at the rear end of the last casing 6 is elastically moved with M 150 using the pressing force of the air cylinder 123. objectively and substantially closed. The shear sent from the face is strongly consolidated by the rotation of the feed blade 40 of the auger 7 at the rear of the rearmost casing 6, especially after the end of the feed blade, forming a water-tight wall.

That is, the pickpocket is consolidated and its hydraulic conductivity decreases.

M150 elastically closes the soil discharge port 121, so when the sum of the water retention pressure (arrow B) and the consolidation force exceeds the closing force of MnS2, the soil discharge port 121 opens and the consolidated shear is released. It is discharged and falls into the discharge amount 26. When the compaction force decreases as a result of discharge, the soil discharge port 121 is elastically closed again by the lid 150 to prevent the stagnant water from overflowing. It is preferable that the soil discharge port 121 is reclosed by the lid 150 before the water-stop wall collapses.

In this way, when the overflow of retained water in the retaining layer is prevented, collapse of the face is prevented, and the small diameter pipe propulsion method can be carried out safely.

In addition, the closing force of the lid 150 and therefore the air cylinder 123
The pressure is determined by the sum of the retention pressure and the consolidation force, and the consolidation force is determined by the length of the consolidation part, although it varies depending on the type and viscosity of the pickpocket.

Therefore, the air cylinder 12 is
If the pressing force in step 3 is controlled, the length of the consolidated portion can be made constant and unnecessary wear of the auger feed blade can be prevented. Furthermore, the air cylinder 123 is convenient because the control can be performed remotely.

Note that the water pressure in the water reservoir layer is determined by the groundwater level, so an observation well is dug and the water level is measured to determine the pressing force of the air cylinder 123. However, it is also possible to measure the water retention pressure by attaching a sensor to the groove where the water pressure can be measured. The pressing force of the air cylinder 123 may be automatically controlled using known control means.

(Hereinafter, blank space) As the casing 6 advances, and before all of it enters the shaft, the casing 147 is reconnected to the next casing together with the lid 150 and its attachments, and the soil discharge port 121 is connected to the last casing. Place it so that it is located at the rear end of the

Therefore, confirmation of the water stoppage effect and soil removal are performed within the shaft, making processing easier and improving work efficiency.

Embodiment 2 shown in FIGS. 5 and 6 is similar to Embodiment 1, in which one end of a cylindrical casing 75 is connected to the rear end of the rearmost casing 6, and the other end is used as a lower soil discharger. The M-78, which has a cylindrical leg portion 77 that slides along the wall surface of the housing 75 and through which the rotating shaft 28 is inserted, is placed on the lower earth discharger. A coil spring 80 is interposed between the lid 78 and the wall 79 of the main body 4 while being compressed, and the extension force of the coil spring 80 causes the M7B to elastically close the lower earth removal.

When the sum of the water retention pressure and the compaction force exceeds the closing force, the lid 78 opens and the earth is discharged through the window 81 of the leg 77 as shown in FIG.

In the second embodiment shown in FIGS. 5 and 6, the coil spring 80
Since the compressive force cannot be changed after installation of the coil spring 80, it is not possible to respond to changes in water retention pressure after installation of the coil spring 80. However, since its structure is simple, it can be manufactured easily and It is fully applicable to geological formations with constant water retention pressure.

Since the soil discharge port in Examples 1 and 2 is provided at the rear end of the rear casing in the axial direction of the auger shaft, the soil is discharged from the rear wall of the shear consolidation water stop wall. Therefore, since the soil removal direction and the consolidation direction by the auger's feed blades are the same, the soil is removed smoothly, and the soil is discharged sequentially from the rear wall of the consolidation water stop wall, so the water stop wall collapses. This reduces the risk of sudden flooding.

In the figures of Examples 1 and 2, the slurry supply section is not provided in the casing, but it goes without saying that this may be provided as shown in FIG. 7 or FIG. 14. .

In Examples 3 and 4 shown in FIGS. 7 to 11, the housing 47 that is detachably connected to the rear end of the rearmost casing 6 and is integrated with a part of the casing 6 is the same as the casing 6. It is composed of a cylinder 48 with a large diameter and a rectangular cylinder 49 branching at a right angle from the cylinder, and soil discharge ports 21 are provided at both ends of the rectangular cylinder 49.
is formed. A lid 50 is attached to the soil discharge port 21.
1 so as to press it elastically. Therefore,
The soil discharge port 21 is provided in the radial direction of the auger shaft, and the lid 50 applies an elastic closing force to the soil discharge port 21 from the side in the direction in which shear is transferred by the feed blade of the auger 7.

In the third embodiment shown in FIGS. 8 and 9, M5O is installed in the soil discharge port 21.
is placed on the lid 5 via a hinge 51 so that it can be opened and closed freely.
0 is opened and closed by the reciprocating movement of the piston rod 53 of the air cylinder 23, which is pivotally connected thereto via a pin 52, as shown by the solid line and the two-dot chain line in FIG.

The other end of the air cylinder 23 is pivotally connected to a bracket 56 via a pin 55, and the bracket 56 is fixed to a slidable plate 24 on a connecting member 25 that connects the device main body 4 and the pressing plate 10.

Since the plate 24 is slidable, the lid 50 can be appropriately attached to the soil discharge port 21 even if the positional relationship between the end of the small diameter pipe 9 and the end of the casing 6 is misaligned.

Further, since the lid 50 is opened and closed by the air cylinder 23, the pressure on the soil discharge port 21 of the lid 50 is elastic, and the closing force can be changed by remote control.

FIG. 10 is an operating circuit diagram of the air cylinder 23, in which 53 is a piston rod, 57 is a compressor, 58 is a pressure regulator, 59 is a meter, 60 is a switch, 61 is a speed controller, and 23 is an air cylinder. The operation is similar to that of the first embodiment shown in FIG.

As shown in FIG. 7, the casing 6 is provided with a slurry introduction part 20, and this introduction part 20 extends from the introduction port 44 formed in the casing 6 along the casing 6. It consists of an introduction pipe 45 and a connection port 46.

When carrying out the small-diameter pipe propulsion method using a device having the above structure, when excavating a water-retaining stratum, the earth discharge port 21 at the rear end of the last casing 6 is opened using the pressing force of the air cylinder 23 and is elastically moved by the lid 50. The slurry introduction part 20 of the casing 6 in the shaft is opened, the slurry feeding vibro 4 is connected to the connecting part 46, and the slurry is introduced into the casing 6 from the direction of the arrow.

The shear sent from the face is mixed into mud by the rotation of the feed blade 40 of the auger 7 and is sent to the last casing 6.
It is consolidated at the rear of the wall, forming a cut-off wall made of a consolidated mixture of shear and mud. That is, the mud fills the gaps between the layers and lowers their hydraulic conductivity.

M2O elastically closes the soil discharge port 21, so when the sum of the water retention pressure (arrow B) and the consolidation force exceeds the closing force of the lid 50, the soil discharge port 21 opens and the slurry is continuously consolidated. The mixture is discharged and falls into the soil receiving tray 26. When the compaction force decreases as a result of discharge, the soil discharge port 21 is elastically closed again by W2O, and overflow of the stagnant water is prevented. It is preferable to reclose the soil discharge port 21 with M2O before the water-stop wall collapses.

As the casing 6 moves forward, the mud introduction section 20 of the casing 6 is closed before it enters the underground from the shaft, that is, before the connecting section 46 enters the shaft, and the introduction section 20 of the casing 6 in the tangential direction is closed.
The slurry is introduced into the casing 6 in the same manner as described above. At this time, the soil discharge casing 47 is reconnected to the next casing together with the M2O and its attachments, and arranged so that the soil discharge port 21 is located at the rear end of the last casing.

Therefore, the supply of slurry into the casing is carried out in the shaft as well as the confirmation of the water supply effect and the removal of soil, which facilitates treatment and improves work efficiency. Furthermore, since the supply distance of the slurry is shortened, it is possible to use slurry having a high viscosity, in other words, a small coefficient of permeability, and the consolidation effect and hence the water-stopping effect can be enhanced. Furthermore, the pump for supplying slurry can also be small.

In addition, this slurry supply is limited when the water retention pressure is large, such as in a water-retaining stratum with a high water level, or when the hydraulic conductivity of the shear is large (for example, when the size of the shear is large, or when the shear is crushed Even if the size difference is below a certain level, it is effective when the proportion of atomized shear and fine earth and sand is small.

However, when excavating a water-retaining stratum with gravel, such as a sand and gravel layer, a crusher for crushing gravel as shown in Figure 16 is attached to the rotating cutter head, and the gravel is crushed into fine pieces. Since the resulting atomized pickpockets are compacted with the auger along with the fine sediment originally in the strata, there are relatively few cases where slurry needs to be supplied, except in high-water strata.

In the fourth embodiment shown in FIG. 11, the closing force of the lid 50 to the soil discharge port 21 is obtained by the extension force of the coil spring 65.

N50 has legs 66 on both sides, and these legs 66
The lid 50 is opened and closed by sliding on a sliding plate 67 fixed to the housing 49.

One end of the coil spring 65 is fixed to the surface of the lid 50, and the other end is fixed to the back surface of the compression plate 68.

A bag-like protrusion 69 having a cleaning hole 70 is formed on the back surface of the compression plate 68, and a hole into which the tip of the screw 71 can be inserted is formed from the zero surface of the compression plate 68 to the bag-like protrusion 69. 7
2 is formed.

The thread 71 has a thread cut on its surface, and the compression plate 6
Bracket 7 that supports screw thread 71 so as to be perpendicular to 8
3 is screwed on. The bracket 73 is shown in FIGS. 8 and 9.
It slides on the connecting plate 25 in the same way as the bracket 56 in the third embodiment shown.

Therefore, when the handle 74 is rotated to turn the screw 71, the coil spring 65 is compressed, and the N58 elastically closes the soil discharge port 21 due to its expansion force.

When this closing force is exceeded by the sum of the consolidation force by the auger and the water retention pressure, N50 opens as shown by the two-dot chain line.
Earth is removed.

In this way, in the fourth embodiment shown in FIG. 11, after the coil spring 65 is installed, although it is not possible to accurately control the change in the compressive force of the coil spring as in the case of an air cylinder, it is possible to control the change in the compression force of the coil spring in response to changes in the water retention pressure. The closing force can be changed by

Next, in many cases, the water-retaining stratum is also a gravel layer, and when the auger type small diameter pipe propulsion method and device of the present invention is used for a gravel layer, it is necessary to Preferably, the device is equipped with a rotating cutter head having a crusher for crushing gravel to crush the gravel into fine pieces. In addition, when the water-retaining stratum is a sand layer, such a crusher for crushing gravel may not be provided.

The rotary cutter head 8 shown in FIGS. 16 and 17 includes a rotary cutter 35 for excavating the strata and a multistage rotary crusher 36 for crushing gravel. Divided circular plate P1
2 and rotated together with the rotary cutter 35 by a driving means. Note that the center 0 of this circular plate P12 coincides with the rotation axis O, and 19 is the center of the circular plate P12.
This is a hole for pouring water into the face of the earth formed by 12, and water is carried through the pipe 18 of the auger 7 as needed.

The rotary cutter 35 is composed of three radiation plates 37 extending radially from the rotation axis O, and a reinforcing ring 38 attached to the end of the radiation plates 37.
Upright cutting blades 39 that similarly extend radially from the rotation axis O are mounted on the top, and 6 to 12 (6 in the example of the drawings) cutting blades 42 are also mounted on the ring 3B.

The rotary crusher 36 is disposed within the forest-like inner wall 41 at the tip of the leading pipe 5, and as shown in FIG. 18, circular plates P11 to P2 are laminated, each having a circular periphery and a diameter increasing toward the rear. The centers C4 and C1 of the circular plates P11 and P2 in each stage are eccentric from the rotation axis O.

Therefore, the rotating rasher 36 has a substantially truncated conical shape with its central axis eccentric from the rotating axis.

A circular plate P1 having a somewhat smaller diameter is attached to the rear of the circular plate P2 to facilitate feeding of shear to the auger 7.

As shown in the table below, the centers C4 to C1 of the circular plates P11 to P4, and therefore the centers of most of the circular plates, are arranged to rotate in a spiral manner. In the example shown in this drawing, the direction of this spiral is the same as the direction of the spiral of the feed blade 40 of the auger 7.

(Hereafter, blank space) Plate number Center of each plate Pi, P2
．． P3 G□ P4. P8 c1 P5. P9 C2P6. P.I.O.C.
3 P7. Pll C4 P12 0 As shown in the table above, the center C□ of the circular plates P3 and P2 and the center C of the circular plate P1 located behind them are located at the center of the spiral of centers 04 to C1, The soil is given directionality toward the center of the circular plates P3 to P1 to facilitate feeding into the auger, but the center of the circular plates P3 to P1 is
~ You may arrange|position on the extension line of the spiral drawn by the center of P4.

The rotating cutter head and the leading pipe are made of steel, and the outer periphery of the rotating crusher 36 and the inner wall 41 at the tip of the leading pipe 5 are subjected to surface hardening (not shown) using an electric welding rod.
It has a hardness of about HR042-55, increasing the crushing strength of gravel.

When using the rotary cutter head 8 shown in FIGS. 16 and 17 to excavate a gravel layer and propel a leading pipe and a small-diameter pipe connected thereto, the rotating cutter head 8 shown in FIG. 16 rotates as shown in FIG. The cutter head 8 is lowered rearward, the gap between the rotary crusher 36 and the inner wall 41 at the tip of the leading pipe 5 is narrowed, and the rotary cutter head 8 is rotated.

Then, the gravel excavated by the cutting blades 39 and 42 passes through the gap 43 of the cutter 35 and is sent between the inner wall 41 at the tip of the leading pipe 5 and the rotary crusher 36. Each stage of the rotary crusher 36 is eccentric from the rotation axis,
Since the rotary crusher 36 rotates, the gravel caught between the rotary crusher 36 and the inner wall 41 is crushed by the inner wall 4 due to the rotation of the rotary crusher 36.
1, the compressive force causes the receiver to fracture.

Since the diameter of each stage increases toward the rear, the gravel is gradually crushed into smaller pieces and can be sent later by the auger 7.

The size of the shear sent to the auger is determined by the rotating crusher 36
It is defined by the width of the maximum gap between the circular plate P2, which is the largest diameter part of the inner wall 41.

Furthermore, the finer the size of the shear fed into the auger, the greater the water sealing effect, but if the width of the maximum gap is too small, the work efficiency will be poor. On the other hand, as described above, the water-stopping effect of consolidation differs depending on the ratio of sand to gravel in the gravel layer and the amount of fine powder generated after crushing the gravel. Therefore, the width of the maximum gap is set in consideration of these various factors so as to obtain the optimum water sealing effect.

In addition, at least most of the centers 04 to C1 of each stage are arranged to rotate in a spiral pattern from the front, that is, at least most of the outer periphery of the rotary crusher 36 has a special spiral auger shape. Therefore, the pinched gravel is bitten and forced force is applied to send it to the rear step, increasing the gravel crushing speed and shear transport speed.

Since the center co of the decimal stage immediately before the auger 7 is located inside the spiral drawn by the centers C4 to C1 of each stage in front of it, a centripetal force acts on the gravel, making it easier to transport it to the auger 7. .

Furthermore, as described above, the spiral rotation of the centers C4 to C1 of most of the stages of the rotary crusher 36 is oriented in the same direction as the spiral of the feeding blades, so that the gravel and gravel are smoothly transported. .

Next, when excavating a viscous stratum such as a clay layer and propelling the leading pipe 5 and the small-diameter pipe connected thereto, the rotary cutter head 8 is moved forward as shown in FIG. , the gap between the rotary crusher 36 and the inner wall 41 at the tip of the leading pipe 5 is widened, and the rotary cutter head 8 is rotated. This will prevent the excavated clay from clogging the gap between the rotary crusher 36 and the inner wall 41, and the clay layer can be excavated without replacing the rotary cutter head 8.

In addition, when excavating a clay layer, water is poured into the face from the water injection hole 19 to separate the clay into small pieces and prevent clogging of the gap.

Next, FIG. 20 shows another example of a rotary cutter head suitable for construction in a gravel layer using the auger type small diameter pipe propulsion construction method of the present invention.

The difference between the rotary cutter head 91 in FIG. 20 and the rotary cutter head 8 in FIG. 16 is the shape of the rotary crusher 92. The rotary crusher 36 of the rotary cutter head 8 in FIG. It has a multi-stage shape, with the center of each stage being eccentric from the rotation axis, and the diameter of each stage increasing in order from the front, that is, it is a substantially truncated conical shape that is eccentric from the central axis or the rotation axis. The rotary crusher 92 of the rotary cutter head 91 has an ordinary truncated conical shape without multi-stage grooves, and its center axis 03 is eccentric from the rotation axis 02. Incidentally, the approximately truncated conical shape in this specification refers to such a 20th
This naturally includes the rotating crusher shown in the figure.

Therefore, if the rotary cutter head 91 shown in FIG. 20 is lowered rearward, the gap between the inner wall of the leading pipe and the rotary crusher 92 is pinched, making it possible to crush the gravel in the sand and gravel layer, and if the rotary cutter head 91 is moved forward, , the gap between the inner wall at the tip of the leading pipe and the rotary crusher 92 widens, making it possible to excavate the clay layer.

As described above, if the rotary cutter head shown in Figs. 16 to 20 is used in the construction method and device of the present invention, it is possible to crush gravel with a large permeability coefficient, lower the permeability coefficient, and improve the consolidation water stop effect. This makes it possible to carry out construction work on the water-retaining sand and gravel layer.

Furthermore, if the construction method of moving the rotary cutter head back and forth in Figs. 16 and 20 is used in combination with the construction method and device of the present invention, one device can cut a clay layer, a gravel layer, a water-retaining sand layer, and a water-retaining sand and gravel layer. Since it can handle a variety of geological formations with completely different properties, work efficiency is dramatically improved.

(E) Effects As mentioned above, by adopting the auger type small diameter pipe propulsion method and device of the present invention, it is possible to not only obtain an excellent water stop effect when excavating a water-stagnant stratum, but also to confirm the water stop effect. The soil is removed in the shaft, making treatment easier and improving work efficiency.

In addition, when using slurry to enhance the consolidation water-stopping effect, the feeding distance of the slurry becomes shorter, so
In other words, it becomes possible to use mud with a low permeability coefficient,
The consolidation effect and, therefore, the water-stopping effect are improved. Furthermore, the capacity of the pump for supplying slurry can also be small.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the main parts of Example 1 of the construction method and apparatus of the present invention, FIG. 2 is a side view of the main parts of Example 1 of the apparatus of the present invention,
Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is an operating circuit diagram of the air cylinder of Embodiment 1, and Figs. 5 and 6 are explanations of main parts of Embodiment 2 of the device of the present invention. 7 is a schematic explanatory diagram of the main part of the third embodiment of the construction method and apparatus of the present invention, FIG. 8 is a side view of the main part of the third embodiment of the apparatus of the present invention, and FIG.
10 is an operating circuit diagram of the air cylinder of Embodiment 3, FIG. 11 is an explanatory diagram of the main parts of Embodiment 4 of the device of the present invention, and FIG. 12 is the overall structure of the device of the present invention. 13 is a plan view of the main part of the main body of the device shown in FIG. 12, FIG. 14 is an explanatory view showing the overall structure of another example of the device of the present invention, and FIG. 15 is a plan view of the main part of the device shown in FIG. Fig. 16 is an enlarged sectional view of the tip of the leading pipe equipped with a rotary cutter head having a rotary crusher for crushing gravel, and Fig. 17 is a front view of Fig. 16. Figure 18 is the 16th
Front view of the rotary crusher of the rotary cutter head in Figure 1.
Fig. 9 is an explanatory diagram when the rotary cutter head of Fig. 16 is used for a clay layer, and Fig. 20 is an explanatory diagram of the tip of a leading pipe equipped with a rotary cutter head having another rotary crusher for crushing gravel. be. 1.101・・・・・・・Device, 3・・・・・・・
...Shaft, 5... Leading pipe, 6...
...Casing, 7...Old...Auger, 8.9
1... Rotating cutter head, 9...
...Small diameter pipe, 20...Mud introduction section, 21,76゜121...Soil discharge port, 36.92... ... Rotating crusher, 40
......Feeding blade, 50, 78, 150...
·······lid.

Claims (16)

[Claims] (1) A rotary cutter head for excavating the ground is attached to the tip of the leading pipe to which small diameter pipes can be connected, and a casing containing an auger that rotates together with the auger and transports the excavated shear is attached, In the auger-type small-diameter pipe propulsion construction method, in which small-diameter pipes, augers, and casings are connected one after another as the lead pipe is propelled underground from the wall, the small-diameter pipe is propelled and buried underground. When excavating a stratum, elastically and substantially closes the soil discharge port at the rear end of the rearmost casing, and forms a shear consolidation water stop wall at the rear of the rearmost casing by rotation of the feed blade of the auger; A small-diameter pipe propulsion method characterized by the fact that when the sum of water retention pressure and compaction force exceeds the closing force of the soil discharge port, the soil discharge port opens and shear is discharged. (2) The soil discharge port is provided in the axial direction of the auger shaft, and the soil discharge port is provided with an elastic closing force opposite to the direction of shear transfer by the feed blade of the auger, as set forth in claim (1). Small diameter pipe propulsion method. (3) The soil discharge port is provided in the radial direction of the auger shaft, and an elastic closing force is applied to the soil discharge port from the side in the direction of shear transfer by the auger's feed blade, as set forth in claim (1). Small diameter pipe propulsion method. (4) The small-diameter pipe propulsion method according to any one of claims (1) to (3), in which the closing force of the soil discharge port is changed according to changes in water retention pressure. (5) The small diameter pipe propulsion method according to claim (4), wherein the closing force of the soil discharge port is controlled by remote control. (6) A rotary cutter head for excavating the ground is attached to the tip of the leading pipe to which small diameter pipes can be connected, and a casing containing an auger that rotates together with the auger and transports the excavated shear is attached, In the auger-type small-diameter pipe propulsion construction method, in which small-diameter pipes, augers, and casings are connected one after another as the lead pipe is propelled underground from the wall, the small-diameter pipe is propelled and buried underground. When excavating a stratum, the gravel is crushed into fine pieces and sent to the auger, and the soil discharge port at the rear end of the last casing is elastically and substantially closed, and the rotation of the auger's feed blade causes the gravel to be crushed into fine pieces and sent to the auger. A small-diameter device that forms a shear consolidation water-stop wall at the rear of the casing, and when the sum of stagnant water pressure and consolidation force exceeds the closing force of the soil discharge port, the soil discharge port opens and discharges the soil. Pipe propulsion method. (7) A rotary cutter head for excavating the ground is attached to the tip of the leading pipe to which small-diameter pipes can be connected, and a casing containing an auger that rotates together with the auger and transports excavated shear is attached to the shaft. In the auger-type small-diameter pipe propulsion construction method, in which small-diameter pipes, augers, and casings are connected one after another as the lead pipe is propelled underground from the wall, the small-diameter pipe is propelled and buried underground. During excavation of the formation, mud is introduced into the casing, elastically and substantially closes the soil discharge port at the rear end of the rearmost casing, and the rotation of the auger feed blade causes shear to be applied to the rear of the rearmost casing. It is characterized by forming a water-stop wall for mud compaction mixing, and when the sum of the retention water pressure and compaction force exceeds the closing force of the mud discharge port, the soil discharge port opens and a mixture of mud and mud is discharged. Small diameter pipe propulsion method. (8) A rotary cutter head for excavating the ground is installed at the tip of the leading pipe to which small-diameter pipes can be connected, and a casing containing an auger that rotates together with the auger and transports the excavated shear is attached to the shaft wall. In equipment used in the auger-type small-diameter pipe propulsion method, which connects small-diameter pipes, augers, and casings one after another as the lead pipe is propelled into the ground. An apparatus characterized in that a soil discharge port is provided at the rear end of the rearmost casing, and the soil discharge port is substantially covered with a resiliently pressable lid. (9) The device according to claim (8), wherein the soil discharge port is provided in the axial direction of the auger shaft. (10) The device according to claim (8), wherein the soil discharge port is provided in the radial direction of the auger shaft. (11) The device according to any one of claims (8) to (10), wherein the lid is pressed by a pressing means that can change the pressing force. (12) The device according to claim (11), wherein the lid is pressed by a pressing means that can control changes in pressing force by remote control. (13) A rotary cutter head for excavating the ground is attached to the tip of the leading pipe to which small-diameter pipes can be connected, and a casing containing an auger that rotates together with the auger and transports the excavated shear is attached to the shaft wall. In equipment used in the auger-type small-diameter pipe propulsion method, which connects small-diameter pipes, augers, and casings one after another as the lead pipe is propelled into the ground. , characterized in that a crusher for crushing gravel is attached to a rotating cutter head, a soil discharge port is provided at the rear end of the rearmost casing, and the soil discharge port is substantially covered with a lid that can be elastically pressed. device to do. (14) The apparatus according to claim (13), wherein the gravel crushing crusher is a rotating crusher having a substantially truncated conical shape, the center axis of which is eccentric from the rotation axis. (15) The rotary crusher is multi-stage, the center of each stage is eccentric from the rotation axis, and the center of at least most of the stages is arranged so as to rotate in a spiral pattern from the front. 14) The device described in item 14). (16) A rotary cutter head for excavating the ground is attached to the tip of the leading pipe to which small-diameter pipes can be connected, and a casing containing an auger that rotates together with the auger and transports the excavated shear is attached to the shaft wall. In equipment used in the auger-type small-diameter pipe propulsion method, which connects small-diameter pipes, augers, and casings one after another as the lead pipe is propelled into the ground. , a device characterized in that the casing is provided with a slurry inlet, a soil discharge port is provided at the rear end of the rearmost casing, and the soil discharge port is substantially covered with a resiliently pressable lid. .