KR20090124521A - Horizontal ring type rotary drill system and method using the same - Google Patents

Abstract

PURPOSE: A horizontal rotary ring excavation system and an excavation method using the same are provided to reduce power consumption, and replace an existing drain pipe without excavation. CONSTITUTION: A horizontal rotary ring excavation system is composed as follows. A cylinder main case(10) and a cylinder inner sleeve(20) capable of rotating in the cylinder main case are prepared. A side roller(21) fixed by a roller seat is installed between the cylinder main case and the cylinder inner sleeve. A roller(23) is fixed on the rear end of the cylinder inner sleeve, and a support supporting the roller is fixed in inner side wall of the cylinder main case. A contact surface of the support and the roller has a concave rail(31). A power motor(40) is installed on the inner side wall of the cylinder main case, and a pinion gear(42) is assembled on a shaft of the power motor, and then a ring gear(43) connected with the pinion gear is fixed on the inner side wall of the cylinder inner sleeve. A flange disc(26) is installed in foremost end of the cylinder inner sleeve at a right angle, and a bit(24) formed like a ring is assembled on the flange disc, and then soil is cut and excavated by rotating a tungsten carbide welded and inserted to the bit.

Description

Horizontal rotary ring excavation device and excavation method using same {HORIZONTAL RING TYPE ROTARY DRILL SYSTEM AND METHOD USING THE SAME}

The present invention relates to a horizontal rotary ring excavation device and an excavation method using the same. More specifically, by installing a smaller inner sleeve inside the excavator case and rotating only the inner sleeve, the excavation cross section can be greatly reduced, thereby reducing power consumption. It is possible to replace the existing sewage pipe by the non-adhesive method, and the main body of the excavator is inserted into a double pipe type with a larger diameter hole, so that the groundwater existing in the soil layer or the sewage flowing through the existing sewer pipe can be It relates to a horizontal rotary ring excavation device and a drilling method using the same that allows drainage out of the gang through the space or fuse between the case and the perforated pipe without interruption.

In recent years, as industrialization of various fields has developed, it is inevitable that the construction of railway, road, electricity, communication, water supply, and sewage fields must be complicatedly intersected and installed, and the above listed facilities are buried underground. There is a need for a technology that can install and replace underground pipe structures by a more convenient, quick and safe non-adhesive method.

Conventionally, as shown in Figure 1, there is a mechanical excavation method of the shield machine (shield type rotary excavation device), more specifically to explain the excavation of the earth and sand by rotating the front of the head (1) of the device, Rotational power is rotated by the power motor (3) connected to the central shaft (2) and the rotating tip head is installed by a bit (4) for cutting the soil to excavate the soil.

In addition, the excavated soil is carried by the screw belt (5) to be loaded into the transport vehicle (6) to be transported out of the gang, or by circulating water by circulating the water into the rotary drilling head and draining water into another passage. The excavated soil is transported out of the gang but the mud transported out of the gang is transported again by dividing it into mud and soil again.

However, in this manner, the complex mechanism and excessive weight of the excavator is inefficient for work, and the excessive weight of the device causes the settlement of the device, which makes it difficult to adjust the direction.

Moreover, the front of the propellant requires high power, and in particular, the drilling head should be installed in the shape of a cross or disk around the power shaft, so that the front of the excavator is sealed, so that obstacles such as underground burial can be found in advance. Since the damage of the buried structure during the excavation was pointed out as a disadvantage causing another accident, there was also a disadvantage that a high cost is required due to the complexity of the front equipment and the rear equipment.

On the other hand, another conventional technique simply presses the steel pipe in the rear by a hydraulic jack without rotation, and drills the earth and sand by means of manpower at the tip of the steel pipe by a manpower, and the excavated soil The primitive method of repeating the process of transporting out of the gang is used. However, when excavating the soil by manpower at the top end, there is a risk of tip collapse due to the pre-excavation. When the limit is reached, the pipe also reaches a certain depth, which makes it difficult to push further due to earth pressure, which is pointed out as a limitation due to forced indentation.

The present invention has been made to solve the above problems, an object of the present invention is to first, the first end of the excavator excavation as a rotary mechanical excavation power to the inner wall of the excavator case without the excavation rotating body by the central axis inside the machine Attach the motor, install the pinion gear on the shaft end of this power motor, install the ring gear connected to the pinion gear on the inner sleeve of the cylinder inside the excavator, and make a bit wide enough to cut the soil on the tip of the inner sleeve. It is to provide a horizontal rotary ring excavation device and a drilling method using the same to minimize the required power by installing a narrow exchange operation to excavate the soil.

Second, another object of the present invention is to install a device such as a power motor, gear, inner sleeve and bits to the inside wall of the excavator, to form a space in the center of the excavator to use the excavated soil to be a vacuum suction path from the outside In addition, the present invention provides a horizontal rotary ring digging device and an excavation method using the same, which can be visually inspected to avoid accidents when encountering the tip surface and the buried underground structure during excavation promotion.

Third, another object of the present invention is to install a hopper to suck the excavated soil that is pushed into the excavator by a rotary bit attached to the screw blade in the excavator inner space and connected to the vacuum pit through a pipe connected to the hopper It is to provide a horizontal rotary ring excavation apparatus and a drilling method using the same that can be automatically transferred to the suction out of the gang by a vacuum pump.

Fourth, another object of the present invention consists of a double pipe type inserted into the perforated pipe of the excavator main case when the existing sewage pipe is replaced with a new pipe by a non-adhesive method flows into the groundwater or existing sewer pipe existing in the soil layer The present invention provides a horizontal rotary ring excavator and an excavation method using the same so that the sewage can be drained out of the gang without interruption through the space or fuse between the excavator main case and the perforated pipe.

In order to achieve the above object, the present invention has a cylindrical inner case and a separate cylindrical inner sleeve that can rotate inside the main case and a side roller fixed between the cylindrical main case and the inner sleeve by a roller sheet Install a certain number to allow the inner sleeve to rotate freely,

The roller is fixed at the rear end of the cylindrical inner sleeve, and the pedestal supporting the roller is fixed to the inner wall of the main case of the excavator, and the connection surface of the pedestal and the roller is a concave rail, so that the cylindrical inner sleeve can rotate smoothly. To ensure that

A predetermined number of power motors are installed on the inner wall of the main case, the pinion gear is assembled to the power motor shaft, and the ring gear to which the pinion gear is connected is fixedly attached to the inner wall of the inner sleeve so that the pinion gear is connected to the power motor. When rotated by the reducer, the ring gear and inner sleeve can rotate.

Its technical configuration is to mount a flange disk perpendicular to the inner sleeve at the innermost end of the cylindrical inner sleeve, and to assemble the ring-shaped bit on the flange disk, and to cut and excavate the soil while rotating the cemented carbide inserted into the bit. Basic features of the award.

In addition, the present invention is to replace the existing sewage pipe or when the groundwater is present in order to excavate in a non-adhesive method by inserting the main case into a larger diameter hole pipe and installing a pad between the hole pipe and the main case welded pipe pipe The main case is characterized in that it is configured in a double tube form by combining so as not to be separated from each other.

As described above, the inventors of the present invention, the horizontal rotating ring excavation device and the excavation method using the same can install a smaller inner sleeve inside the excavator case and rotate only this inner sleeve to greatly reduce the excavation cross section, thereby reducing the power required. It is designed to install power motor, gear, inner sleeve and bit on the inside wall of the excavator, so that space is formed in the center of the excavator so that accidents can be quickly avoided when encountering the tip surface and the underground structures in the excavation. Visual inspection is possible, and the transfer of the excavated soil is conveniently carried out by the suction method in which the excavated soil is sucked by the vacuum pump installed outside the gang by using the space inside the excavator, and the main case of the excavator is larger in diameter. Underground existing in the soil layer by forming a double tube inserted into the perforated pipe Or via the main fuse or the space between the casing and yugonggwan excavators sewage that flows into the existing sewer there is an effect that allows you to drain out of the gang without interruption.

When described in detail with reference to the accompanying drawings a preferred embodiment of the present invention configured as described above are as follows.

Figure 2 is a longitudinal cross-sectional view showing the internal structure of one embodiment of a horizontal rotary ring drilling apparatus according to the present invention, Figure 3 is a longitudinal cross-sectional view showing the internal structure of another embodiment of a horizontal rotary ring drilling apparatus according to the present invention, Figure 4 3 is an exploded cross-sectional view illustrating a power transmission system of the horizontal rotating ring excavation device according to the present invention, and FIG. 6 is a side roller portion of the horizontal rotating ring excavation device according to the present invention. 7 is a cross-sectional view taken along the line AA ′ of FIG. 3, FIG. 8 is a cross-sectional view taken along the line B-B ′ of FIG. 3, and FIG. 9 is an end rotation bit of the horizontal rotating ring drilling device according to the present invention. And front view showing the screw blades.

As shown in Figure 2, the Shieldless Sleeve rotary ring excavation device of the present invention has a cylindrical cylindrical drilling equipment main case 10 and a separate cylindrical inner sleeve 20 that can rotate inside the main case 10 Side rollers 21 are installed at four or more positions between the cylindrical main case 10 and the inner sleeve 20 to allow the inner sleeve 20 to freely rotate, and the side roller 21 6 and 7 is fixed by a roller seat (roller seat, 22), the roller sheet 22 is preferably to be detachable so that the side roller 21 can be replaced if necessary. Do.

In addition, the rear end of the cylindrical inner sleeve 20 is fixed to the roller 23 as shown in Figure 5, the roller 23 is the earth pressure applied to the excavator front bit 24 and the back of the excavator It is desirable to be able to withstand the pressure due to the thrust applied by the hydraulic jack (not shown) installed in the work tool.

The number of the rollers 23 can be increased or decreased to two or four sets or more, and the pedestal 30 supporting the rollers 23 is fixed to the inner wall of the excavator main case 10 so as to be attached and welded to a rigid roller. The base 30 and the connecting surface of the pedestal 30 and the roller 23 is a concave rail 31 to prevent the roller bearing from deviating from the track, so that the inner cylindrical inner sleeve 20 smoothly. Allow it to rotate.

In addition, the power motor 40 is installed so as to be symmetrical with each other by using two, the pinion gear 42 is assembled to the shaft 44 of the power motor 40, the relative to which the pinion gear 42 is connected The ring gear 43, which is a gear, is fixedly attached to the inner wall surface of the inner sleeve 20, so that the pinion gear 42 rotates by the power motor 40 and the reducer 41 as shown in FIG. The gear 43 rotates and thus the inner sleeve 20 rotates.

On the other hand, at the top of the cylindrical inner sleeve 20, the flange disk 26 is mounted at right angles to the inner sleeve 20, and the flange disk 26 is assembled with a ring-shaped bit 24 for cutting and drilling the ground layer. By combining, the tungsten carbide carbide tungsten carbide 25 inserted into the inner sleeve 20 and the bit 24 is rotated to cut and excavate the soil.

Here, by the inclined surface of the drilling bit surface installed at the top of the excavator and the screw 27 shown in Figure 9, when the ring-shaped bit 24 rotates to excavate the soil, the excavated soil is pushed into the excavator. When the soil is excavated by the rotation of the bit 24, the soil in the center of the excavator which is not in contact with the inclined surface of the bit 24 may remain in the core state, and the high pressure water spray nozzle may be used to crush the soil in the core state. The device 50 is attached to the excavator inner cover 60 to spray water to the center of the excavation tip to break up the lumped unsoiled soil by high pressure water spray.

As described above, when the soil excavated by the screw 27 blade of the ring-shaped bit 24 head is pushed into the excavator, the soil is connected to the hopper 70 and the pipe 71 connected to the hopper. It is sucked into the vacuum cylinder 72 which is installed outside the gang, and the vacuum cylinder 72 is maintained in a vacuum state by the vacuum pump 73 and the motor 74, so that all the soil approaching the inlet of the hopper 70 is approached. It becomes possible to suck into the vacuum cylinder 72.

And the cover 60 to protect the inner sleeve (20), pinion gear (42), ring gear (43), power motor (40), reducer (41) and roller (23) inside the excavator It is desirable to enable disassembly and assembly within the excavator.

On the other hand, as shown in Figure 2 and Figure 3, while the rotary excavator is going to be excavated at the same time in the work tool after the steel pipe or concrete pipe 80 to continue to be connected to the excavator to promote, at this time steel pipe or concrete pipe ( 80 and the connecting portion 82 of the excavator main case 10 are inserted into the male and female socket type so that the direction can be freely changed when the direction of the excavator is adjusted by the hydraulic cylinder 81.

In addition, a retainer 28 is installed on the connection surface of the soil layer cutting bit 24 and the excavator main case 10 to prevent groundwater or soil from flowing into the machine during excavation, and a rotating inner sleeve 20 In order to prevent the soil and groundwater from flowing into the cover 60, the rubber plate 61 is installed between the cover 60 and the cover 60. The rubber plate 61 is assembled to the cover 60 by bolts and nuts. It is desirable to enable this.

In this way, all the devices are installed on the inner wall of the excavator, unlike the conventional shield machine, the excavation tip surface is opened, and the excavated soil can be transferred to the internal space of the excavator, and the excavated soil transfer method is also carried out through the vacuum pump 73 or the like. It can be conveniently transported by suction method, which greatly reduces the load on the drilling equipment, solves the problem of turning due to settlement by the load of the machine, and reduces the cost of drilling. Excavation minimizes the excavation surface, which is the part of the excavator contacting the soil surface, to minimize the power required during excavation.

On the other hand, when replacing the existing sewage pipe in the non-adhesive method as shown in Figures 3 and 4 or groundwater is present, the excavator main case 10 is inserted into the larger diameter hole 90 and the hole pipe 90 The pad 91 is installed and welded between the main case 10 and the main case 10 so as to be coupled to each other so that the oil pipe 90 and the main case 10 are not separated from each other.

Therefore, the double pipe type excavator having a larger diameter than the existing sewer pipe excavates the earth and sand surrounding the existing sewer pipe while the existing sewer pipe is taken out of the gang through the inside of the excavator. It is preferable to carry out by artificially destroying, and the steel pipe or concrete pipe 80 connected to the rear of the excavator is to replace the existing sewer pipe.

Here, the sewage flowing in the existing sewer pipe can continue to flow without interruption of the sewage flow through the pipe 80 to be replaced, when the small branch lines connected to the existing sewer pipe during the excavation, the sewer flows to the branch line perforated pipe (90 Induces the space between the hole tube 90 and the main case 10 through the slot (92) of the) to be flowed out of the gang without interruption, the hole tube (90) is also excavated with the drilling hole 90 connected to each other The groundwater present in the soil layer may also be collected through the slot 92 of the perforated pipe 90 into the space between the perforated pipe 90 and the main case 10 to be induced and drained out of the gang.

As such, when using the double tube type excavator, the drilling bit 24 at the tip of the excavator should be excavated using a little larger than the diameter of the perforated pipe 90 so that the rear tube can be easily driven. After excavating the branch line by a certain length while cutting the branch line, the branch line is drilled to replace the branch line by drilling the hole 80 and the tube 80 replaced so that the cut branch line communicates with the hole tube 90 and the tube 80 being replaced. When connected to the steel pipe or concrete pipe 80 to be used, the sewage in the cut branch line flows into the newly replaced steel pipe or concrete pipe (80).

After all of the branch lines cut as described above are connected to the steel pipe or the concrete pipe 80, the grout is filled with cement mortar by filling the space between the perforated pipe 90 and the steel pipe or the concrete pipe 80 with any kind of vibration, earthquake or settlement. The case is finished with a sturdy tube in the form of a triple tube that can withstand the occasion.

If described through the construction process of the excavation method using the action of the present invention horizontal rotating ring excavation device as follows.

First, the power motor 40, the inner sleeve 20, the bit 24, the gears 42, 43, etc. mount the excavator installed on the inner wall of the main case 10 to the work tool and simultaneously push it to the rear hydraulic jack. Let's do it.

At this time, when the power motor 40 is operated, the pinion gear 42 installed at the shaft end of the power motor 40 rotates, and when the ring gear 43 connected to the pinion gear 42 rotates, a cylindrical inner sleeve ( 20) and the bit 24 provided at the tip of the inner sleeve 20 rotate to cut the soil.

Next, when excavating the earth and sand by the rotary bit 24, the earth and sand in the center which is not in contact with the bit surface may remain in the core state, and the high pressure water spray nozzle device 50 attached to the excavator inner cover 60 may be used. By spraying water to the center of the top end of the excavation, crushed unsoiled soil is crushed by high pressure water spraying.

On the other hand, in the case of replacing the existing sewage pipe with a new pipe, a double pipe type excavator consisting of an excavator main case 10 and a perforated pipe 90 excavates the earth and sand surrounding the existing sewer pipe and artificially destroys the existing sewer pipe. The steel pipe or concrete pipe (80) connected to the rear of the excavator while being taken out of the gang through the inside of the excavator replaces the existing sewer pipe.

Next, the cut or crushed soil of the excavator internal space is installed outside the gang through the hopper 70 and the pipe 71 connected to the hopper and is vacuumed by the vacuum pump 73 and the motor 74. It is made to suck in the vacuum cylinder 72 hold | maintained.

Next, when the excavation is progressed to a certain degree, the work tail is connected to the excavator main case 10 by continuously connecting the steel pipe or concrete pipe 80 to the hydraulic jack of the rear work tool, and the direction of the excavator is the hydraulic cylinder The direction can be changed freely by the adjustment of 81.

Therefore, repeating the excavation and connection of the steel pipe or concrete pipe 80 and the extension of the hydraulic jack can complete the planned linear construction.

On the other hand, when excavation when replacing the existing sewer pipe with a new pipe can be a small branch line connected to the existing sewer pipe can be cut, at this time the sewage flowing in the branch line through the slot 92 of the perforated pipe 90 90) and into the space between the main case 10 to be flowed out of the gang without interruption and the perforated pipe 90 also continues to be connected to the perforated pipe 90 together with the excavation propulsion, and at the same time, branch line with a double pipe type excavator After excavating by a certain length while cutting the perforated pipe 90 and the pipe 80 to be replaced so that the cut branch line is in communication with the perforated tube 90 and the pipe 80 to be replaced by a steel pipe or concrete Connection to the pipe 80 allows sewage in the cut branch line to flow into the newly replaced steel or concrete pipe 80.

After all of the branch lines cut as described above are connected to the steel pipe or the concrete pipe 80, the space between the perforated pipe 90 and the steel pipe or the concrete pipe 80 is filled with cement mortar and grouted to finish with a solid pipe in the form of a triple pipe. do.

In the above, specific preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the above-described embodiments, and those skilled in the art to which the present invention pertains have the technical gist of the present invention. Various changes can be made without departing from.

1 is a longitudinal cross-sectional view showing the structure of a conventional shield-type rotary drilling rig.

Figure 2 is a longitudinal sectional view showing the internal structure of one embodiment of a horizontal rotary ring excavation device according to the present invention.

Figure 3 is a longitudinal sectional view showing the internal structure of another embodiment of a horizontal rotary ring drilling device according to the present invention.

4 is a perspective perspective view of the conductor of FIG. 3.

Figure 5 is an enlarged cross-sectional view showing a power transmission system of the horizontal rotary ring excavator according to the present invention.

Figure 6 is an enlarged cross-sectional view showing a side roller portion of the horizontal rotary ring excavation device according to the present invention.

7 is a cross-sectional view taken along the line AA ′ of FIG. 3.

8 is a cross-sectional view taken along the line BB ′ of FIG. 3.

9 is a front view showing the cutting edge of the rotary blade and the screw blade of the horizontal rotary ring excavator according to the invention.

Explanation of symbols on the main parts of the drawings

10: Main Case 20: Inner Sleeve

21: side roller 22: roller sheet

23: roller 24: bits

25: hardwood 26: flange disk

27: screw 28: retainer

30: base 31: concave rail

40: power motor 41: reducer

42: pinion gear 43: ring gear

44: shaft 50: nozzle device

60: cover 61: rubber sheet

70: hopper 71: pipe

72: vacuum cylinder 73: vacuum pump

74: motor 80: steel pipe, concrete pipe

81: hydraulic cylinder 82: connection

90: air pipe 91: pad

92: slot

Claims (8)

A roller sheet 22 is disposed between the cylindrical main case 10 and the inner sleeve 20 with a cylindrical inner case 10 and a separate cylindrical inner sleeve 20 that can rotate inside the main case 10. By installing a certain number of side rollers 21 fixed to the inner sleeve (20) to be free to rotate, The back end of the cylindrical inner sleeve 20 is fixed to the roller 23 and the support base 30 supporting the roller 23 is fixed to the inner wall of the excavator main case 10 and the pedestal 30 and The connecting surface of the roller 23 is a concave rail 31 to allow the cylindrical inner sleeve 20 to rotate smoothly, A predetermined number of power motors 40 are installed on the inner wall of the main case 10, and the pinion gears 42 are assembled to the power motors 40 and the shafts 44, and the pinion gears 42 are connected to each other. The ring gear 43 is fixedly attached to the inner wall of the inner sleeve 20 so that the pinion gear 42 is rotated by the power motor 40 and the reducer 41 so that the ring gear 43 and the inner sleeve 20 are rotated. To rotate, At the top end of the cylindrical inner sleeve 20, a flange disk 26 is mounted at right angles to the inner sleeve 20, and the flange disk 26 is assembled with a ring-shaped bit 24, and the bit 24 is assembled. Horizontal rotary ring excavation device, characterized in that by cutting the excavated sand while the cemented carbide material 25 is inserted into the excavation. The method of claim 1, In order to replace the existing sewer pipe or to excavate in a non-adhesive method when the ground water is present, the main case 10 is inserted into the larger diameter hole 90 and between the hole 90 and the main case 10 There is installed in the pad 91 by welding the perforated pipe 90 and the main case 10 by combining so as not to be separated from each other horizontal rotating ring digging device, characterized in that configured in the form of a double pipe. The method according to claim 1 or 2, The cover 60 to protect the inner sleeve 20, the pinion gear 42, the ring gear 43, the power motor 40, the reducer 41 and the roller 23, etc. in the excavator Horizontal rotating ring excavation device, characterized in that further configured. The method according to claim 1 or 2, The high pressure water spray nozzle device 50 for crushing the soil in the core state remaining in the center of the excavator that is not in contact with the inclined surface of the bit 24 when excavating the soil by the rotation of the ring-shaped bit 24 is Horizontal rotating ring excavation device, characterized in that further configured. The method according to claim 1 or 2, The excavated earth and sand pushed into the excavator by the ring bit 24 is sucked into the vacuum chamber 72 installed outside the gang through the hopper 70 and the pipe 71 connected to the hopper, Vacuum chamber 72 is horizontal rotating ring excavation apparatus, characterized in that further comprises a configuration to be maintained in a vacuum state by the vacuum pump (73) and the motor (74). (a) Power motor 40, inner sleeve 20, bit 24, and gears 42 and 43 are mounted on the workbench with the excavator installed on the inner wall of main case 10 and excavated and pushed by rear hydraulic jack at the same time. Making a step; (b) As the power motor 40 of step (a) is operated, the pinion gear 42 installed at the shaft end of the power motor 40 rotates, and the ring gear 43 connected to the pinion gear 42 rotates. A cylindrical inner sleeve 20 and a bit 24 installed at the tip of the inner sleeve 20 to cut the soil; (c) high pressure water spray nozzles for the earth-soil in the core state remaining in the center of the excavator which is not in contact with the inclined surface of the bit 24 when excavating the soil by the rotation of the ring-shaped bit 24 of step (b) Crushing by spraying water to the center of the excavation end with the apparatus 50; (d) The cut or crushed soil in the excavator internal space in steps (b) and (c) is installed outside the gang through the hopper 70 and the pipes 71 connected to the hopper, so that the vacuum pump 73 and Suctioned into the vacuum cylinder (72) held in a vacuum state by the motor (74) and (e) When the excavation progresses to a certain degree, the work tool rear end horizontal rotating ring, characterized in that the steel pipe or concrete pipe 80 is continuously connected to the excavator main case 10 to propel with a hydraulic jack of the rear work tool Excavation method using excavation device. In the construction method of excavating while replacing the existing sewer pipe, (a) the power motor 40, the inner sleeve 20, the bit 24, and the gears 42 and 43 are installed on the inner wall of the main case 10, and the excavator main case 10 has a larger diameter hole. Inserted into the 90, between the hole 90 and the main case 10, the pad 91 is installed and welded in the form of a double pipe excavator is working excavator to excavate the earth and sand surrounding the existing sewer pipe Mounting on a sphere and simultaneously driving a rear hydraulic jack; (b) As the power motor 40 of step (a) is operated, the pinion gear 42 installed at the shaft end of the power motor 40 rotates, and the ring gear 43 connected to the pinion gear 42 rotates. A cylindrical inner sleeve 20 and a bit 24 installed at the tip of the inner sleeve 20 to rotate the outer soil surrounding the existing sewer pipe; (c) In the step (b), the cut soil in the excavator internal space is installed outside the gang through the hopper 70 and the pipe 71 connected to the hopper and is vacuumed by the vacuum pump 73 and the motor 74. Suctioned into the vacuum cylinder (72) held in the state; and (d) When the excavation is progressed to a certain degree, the existing sewer pipe is artificially destroyed to be taken out of the gang through the inside of the excavator, and at the rear of the work tool, the steel pipe or concrete pipe 80 is continuously connected to the excavator main case 10 and the perforated pipe ( 90) is a drilling method using a horizontal rotary ring excavation device, characterized in that the steel pipe or concrete pipe 80 is configured to replace the existing sewer pipe while propelled by the hydraulic jack of the rear working tool by connecting the perforated pipe (90). . The method of claim 7, wherein (e) When a small branch line is connected to the existing sewer pipe and the branch lines are cut, first, the sewage flowing in the branch line passes through the slot 92 of the perforated pipe 90 to the space between the perforated pipe 90 and the main case 10. After guiding and flowing out of the gang without interruption, and excavated by a certain length while cutting the branch line with the double-pipe type excavator, the cut branch line is in communication with the hole tube 90 and the pipe 80 to be replaced (90) Perforating the pipe 80 to be replaced with the branch line to the steel pipe or concrete pipe 80 to be replaced, so that the sewage in the cut branch line flows into the newly replaced steel pipe or concrete pipe 80; (f) after connecting all of the cut branches of step (e) to the steel pipe or the concrete pipe 80, grouting the space between the perforated pipe 90 and the steel pipe or the concrete pipe 80 by cement mortar Excavation method using a horizontal rotary ring excavation device, characterized in that further configured.

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