JP5216896B2 - Inner unit for propulsion method with low load-carrying propulsion method and device for propulsion method including inner unit - Google Patents

Description

  The present invention relates to a new propulsion method that enables long-distance propulsion even with a low load resistance method using a synthetic resin propulsion pipe typified by vinyl chloride. More specifically, the present invention relates to a propulsion transmission inner unit for the propulsion method and a low load resistance type propulsion method apparatus including the propulsion transmission inner unit.

  Pipe materials used for sewer excavation work were mainly reinforced concrete pipes (fume pipes) in the Showa era. However, in the Heisei era, corrosion of reinforced concrete structures due to hydrogen sulfide and the like became a problem. For this reason, vinyl chloride pipes increased rapidly among non-corrosive synthetic resin pipes, and the share of reinforced concrete pipes is now 1 The result was down to about%.

  On the other hand, the sewerage is mostly laid under the road, and environmental problems such as traffic congestion, vibration, and noise occur in highways, highways, shopping streets, and residential areas. Therefore, from the viewpoint of coping with these problems, it has been increasingly common to dig up a shaft and lay sewer pipes using the propulsion method. In the sewer standards, depending on the type of pipe material used in the propulsion method, the method of propelling long distances using reinforced concrete propulsion pipes and resin propulsion pipes that have a large load bearing capacity is the high load bearing system, and is represented by vinyl chloride. A method of propelling a short distance using a synthetic resin propelling tube is classified as a low load-bearing method.

  However, if a shaft is constructed at a short distance, it will not solve the environmental problem. For this reason, it is required to promote a long distance as much as possible.

  However, in the propulsion method, since the pipe material and the natural ground are in direct contact with each other, the frictional force between the pipe material and the natural ground increases at a long distance (100 m or more), and a large load resistance is required for the pipe material.

  For the above reasons, reinforced concrete propulsion pipes that are no longer used in general due to corrosion problems must still be used as a main component in propulsion works that require long distances. is there.

  Currently, resin propulsion pipes that are resistant to corrosion and have excellent load bearing capacity have been developed. However, since resin propulsion pipes are very expensive compared to reinforced concrete propulsion pipes, they are not widely used at present. is there.

  In view of the above, the present invention has no concerns about corrosion problems in the case of reinforced concrete propulsion pipes, and does not use expensive resin propulsion pipes. To provide a propulsion method inner transmission unit and a propulsion method apparatus including the propulsion inner unit that realize a new long-distance propulsion method that enables long-distance propulsion using a synthetic resin propulsion tube It is an issue.

  The propulsion method inner transmission unit and the propulsion method apparatus including the propulsion inner unit according to the present invention are characterized as follows in order to solve the above-described problems.

1st: Used in the propulsion method with the propulsion pipe material used for the low load capacity propulsion system as a propulsion pipe, and propelled so that the peripheral frictional resistance force between the propulsion pipe and the ground is less than the allowable load bearing capacity of the propulsion pipe A propulsion transmission inner unit that transmits the propulsive force from the main pushing device for each required number of tubes,
Projects Intrusion into the narrow gap between the front end of the rear end of the estimation Susumukan and subsequent propulsion tube, pressing the propulsion tube to the propulsion direction while inscribed in the spiral joint end face of the propulsion pipe collar or with the spiral fittings straight pipe of A propulsion tube support member having a vertical claw piece to support, and
To allow the projecting outwardly of the propulsion tube support member having a vertical pawl, and when the propulsion pipe has reached a predetermined position of the underground is to promote transfer inner unit inside of the propulsion tube support member It has an advancing / retreating mechanism that allows retreating,
a) The advancing / retracting mechanism portion includes an push-out inclined sliding surface of the operation rod that slides on the propelling tube support member and pushes the vertical claw piece outward during the push-out operation of the push-out / retraction operation rod;
b) a projection maintaining plane of the operating rod that is in surface contact with the propulsion direction plane of the propelling tube support member so as to maintain the extruded vertical claw piece in a projecting state;
c) Push-in / pull-in operation In the pull-in operation of the rod, a pulling-inclined sliding surface of the operation rod that slides in contact with the propelling tube support member and retracts the vertical claw piece inwardly;
d) a retraction maintaining plane of the operating rod that is in surface contact with the propulsion direction plane of the propulsion pipe support member so as to maintain the retracted vertical claw piece in a retracted state;
e) the propulsion pipe support member having a sliding portion that advances and retracts by operation of the push-out / retraction operation rod and a maintenance plane that is in parallel with and in surface contact with the projection / retraction maintenance plane of the operation rod;
Propulsion transmission inner unit for low load-bearing capacity scheme jacking method characterized that you include a.

Second: a portion where the advancing / retreating mechanism portion that allows the vertical protrusion of the propelling tube support member to project outward and inwardly projects to the right of the peripheral surface of the propulsion transmission inner unit; 2. The system according to claim 1, wherein there are three systems, a part projecting in the direction and a part projecting in the downward direction, and the push / pull-in operation rod can be operated independently for each system. Propulsion transmission inner unit for the low load-bearing type propulsion method described.
3. A low load resistance propulsion method according to claim 1 or 2, wherein the propulsion method has a ball or a wheel and can be recovered by being pushed or pulled out after completion of propulsion by movement by the ball or wheel. Propulsion transmission inner unit for
Fourth: A) A plurality of axially continuous propelling pipes,
B) Propulsion for a low load-bearing type propulsion method according to any one of claims 1 to 3, wherein a plurality of axially continuous propulsion pipes are provided in a plurality of axially continuous propulsion pipes. Transmission inner unit,
C) A leading conductor for excavation disposed at the forefront of a plurality of axially continuous propulsion pipes,
D) A main pushing device arranged at the rearmost end of a plurality of propulsion pipes continuous in the axial direction,
A low load-bearing type propulsion method apparatus characterized by comprising

5th: A plurality of axially continuous propulsion pipes are composed of one or more of a straight pipe with a rib collar, a straight pipe with a SUS collar, and a straight pipe with a spiral joint. Equipment for low load-bearing type propulsion method described in 1.

Sixth: Inside each of the propulsion transmission inner unit and the propulsion force transmission rod, there are pipes for sending mud and mud to hold the face of the drilling leading conductor, pipes for sending the excavated earth and sand, and excavation power sources 6. A low load-bearing force according to claim 4 or 5, wherein a connecting shaft for a push-out / retraction operation rod of a power line such as a power line, a hydraulic pipe, a surveying hollow part, and a forward / backward mechanism part of a propelling pipe support member is provided. System propulsion method equipment.

  The propulsion pipe material used for low load bearing capacity is a propulsion transmission inner unit that transmits thrust from the main jack every time the friction resistance between the propulsion pipe and ground is below the allowable load bearing capacity of the propulsion pipe. According to the method of the first invention in which the vertical claw pieces of the installed propelling pipe support members are used, the frictional resistance between the natural ground and the propelling pipe material is the required number of propulsion pipes. Compared to the frictional resistance between the ground and the propulsion pipe material generated by the one-span propulsion extension from the starting shaft to the reaching shaft, it becomes very small.

  In this way, if the frictional resistance between the propulsion pipe and the natural ground, which changes depending on the pipe diameter, soil quality, construction conditions, etc., is less than the allowable load bearing capacity of the propulsion pipe, it is supported by the vertical claw piece of the propulsion pipe support member. Extension is not limited by the propellant tube material, and long-distance propulsion can be realized.

  When the excavator reaches the reaching shaft and the propulsion pipe reaches the required position of the reaching shaft, it is not necessary to support the propulsion pipe, and the propulsion transmission inner unit must be recovered. Although the vertical claw piece of the member supports the propulsion tube material, it cannot be recovered, but according to the present invention, the propulsion tube support member having the vertical claw piece can be retracted into the propulsion transmission inner unit by the advance / retreat mechanism. .

  According to the method of the second aspect of the invention, the propulsion pipe support member having the vertical claw piece can be drawn into the propulsion transmission inner unit by the push / pull operation rod of the advance / retract mechanism.

  According to the method of the third aspect of the invention, the propulsion pipe support member having the vertical claw piece can be drawn into the propulsion transmission inner unit and collected by the hydraulic or electric jack of the advance / retreat mechanism.

  According to the method of the fourth aspect of the invention, the propulsion transmission inner unit in which the propulsion tube support member having the vertical claw piece is housed has a ball or a wheel, and is pushed by the shaft after completion of the propulsion by the movement, Alternatively, it can be pulled out and collected.

  An apparatus for a low load resistance propulsion method including a propulsion transmission inner unit that enables the above method is also realized by the present invention.

5th:
A) A plurality of axially continuous propelling pipes,
B) Propulsion for a low load-bearing type propulsion method according to any one of claims 1 to 4, wherein a plurality of axially continuous propulsion pipes are arranged continuously in the axial direction. Transmission inner unit,
C) A leading conductor for excavation disposed at the forefront of a plurality of axially continuous propulsion pipes,
D) A main pushing device arranged at the rearmost end of a plurality of propulsion pipes continuous in the axial direction,
E) A plurality of propulsive force transmission rods continuous in the axial direction in order to transmit the propulsive force from the main pushing device to the excavation leading conductor,
Is a device for low load-bearing type propulsion method.

Sixth: A device for low load resistance propulsion method in which a plurality of axially continuous propulsion pipes are one or more of a straight pipe with a rib collar, a straight pipe with a SUS collar, and a straight pipe with a spiral joint It is.
Seventh: For low-load-resistance propulsion methods, some or all of the plurality of propulsive force transmission rods that are continuous in the axial direction can be replaced by propulsion transmission inner units that are arranged in a plurality of continuous axial directions. Device.
Eighth: Inside each of the propulsion transmission inner unit and the propulsion force transmission rod, there are pipes for sending mud and mud to hold the face of the drilling leading conductor, pipes for sending the excavated earth and sand, and excavation power sources This is a low-load-force propulsion method apparatus provided with a connecting shaft for a push rod / retract operation rod of a power line such as a power line, a hydraulic pipe, a hollow portion for laser surveying, and an advancing / retracting mechanism portion of a propulsion tube support member.

  At present, the low load-bearing method using a vinyl chloride propulsion pipe or the like in the propulsion work occupies about 99% of the market with small pipe diameters of 150 mm and 200 mm. This pipe diameter is often used for inflow into a branch line or main line instead of a sewer main line, and has become the sole place of a low load resistance method as a propulsion method suitable for short distance, low cost and corrosion.

  The vinyl chloride propulsion pipe is lighter, easier to handle, and less expensive than the high load-bearing type propulsion pipe, so the construction period is shorter and cheaper than the high load-bearing type.

  However, if a shaft cannot be constructed due to traffic conditions, road alignment, vibration / noise, or residents' countermeasures, the long-distance propulsion method must be adopted, and the current situation is that it must rely on a high load-bearing method. It is.

  The allowable load capacity of the vinyl chloride propulsion pipe at φ300mm is 32.8t, whereas the allowable load capacity of the reinforced concrete pipe used in the high load resistance method is the same φ300mm and more than 3 times the allowable load capacity (Type II) 111t. In the case of the pipe, the maximum load bearing capacity is 156 t, which is approximately five times as large.

  Since this allowable load bearing capacity is proportional to the propulsion extension, the high load bearing system = long distance and the low load bearing capacity = short distance.

  The propulsion extension of the high load-bearing method varies depending on the pipe diameter, soil quality, and construction conditions, but the distance that can be pushed only by the main jack without using the propulsion jack is about 400 m at the maximum with a pipe diameter of 400 mm.

The low load-carrying type propulsion extension varies depending on the pipe diameter, soil quality, construction conditions, etc., but is usually about 30 to 90 m. (See Japan Sewerage Pipe Promotion Technology Association and Sewerage Association)
Therefore, in the case of the sewer main line and the above reasons, it is common to use a high load-bearing capacity method.

  Resin pipes and ceramic pipes with excellent corrosion resistance have been developed, but they are rarely used because they are expensive. On the other hand, reinforced concrete propulsion pipes with corrosion problems still account for about 70% of the market due to the low construction unit price.

  However, in cities such as Tokyo, where sewage has spread quickly, reinforced concrete propulsion pipes have been used, which causes corrosion such as hydrogen sulfide, which necessitates enormous investment in sewage works.

  In the future, if we continue to use reinforced concrete propelling pipes for propulsion work, we will spend enormous taxes on the renovation work, hindering social development.

  The present invention can realize long-distance / curved construction with a low load resistance method as a propulsion method suitable for low cost and corrosion, and greatly contributes to the development of society.

  Embodiments of the present invention will be described below.

  First, the propulsion of the low load-bearing method assumed by the present invention will be described in comparison with the high load-bearing method.

  As shown in FIG. 1, the high load-bearing method is propelled by using a high load-bearing method (1) typified by a reinforced concrete pipe, and the pipe is fed from the main pushing device (2). In this method, the propulsive force is directly received and transmitted to the leading conductor (3).

  Moreover, the low load-bearing method is propelled by using a low load-bearing tube (5) such as a vinyl chloride tube as shown in FIG. 2 and is necessary for propulsion of the leading conductor (3). In this construction method, the initial resistance of the propulsive force from the main pushing device (2) is applied to the propulsive force transmission rod (4), and the propulsion pipe (5) bears only the resistance of the natural ground and the outer surface of the pipe.

  That is, in the low load resistance method, as shown in FIG. 3, the tip resistance force (F0) (6) of the leading conductor propulsive force is applied to the propulsive force transmission rod (casing, screw conveyor, etc.) (4), (5) is a method in which only the peripheral resistance with the natural ground is borne.

  Since the tip resistance force (6) is applied to the propulsion force transmission rod (4), the propulsion distance can be extended by the tip resistance.

  However, in such a conventional low load resistance method, as shown in FIG. 4, the propulsion pipe (5-1) is sequentially connected through the propulsion pipe collar (5-2), and the propulsion pipe (5-1 ) And the natural ground are limited to a propulsion extension that does not exceed the allowable load capacity of the propulsion pipe (5-1).

  That is, since the propelling pipe (5-1) is pushed in by the main pushing device of the starting shaft, a large force is applied to the propelling pipe close to the starting shaft against the circumferential resistance force of the entire propulsion extension. Therefore, long-distance construction is not possible with a propulsion pipe with a low load bearing capacity.

  However, as shown in FIG. 5, according to the present invention, the propulsion pipe support member (7) provided on the propulsion transmission inner unit (8) with a short extension of the required number of propulsion pipes (5-1) below its allowable load bearing capacity. ), The peripheral resistance force between the number of propelling pipes (5-1) supported and the natural ground acts on the propulsion transmission inner unit (8) provided with the propelling pipe support member (7). Will do.

  As described above, if the propulsion pipe (5-1) is supported by the propulsion pipe support member (7) for each number below the allowable load bearing capacity of the propulsion pipe (5-1), the propulsion extension is limited by the propulsion transmission inner unit (8). ) Allowable load bearing capacity.

  In the conventional low load resistance method, the extension of propulsion was determined under the condition that the peripheral surface resistance between the propulsion pipe and the ground is lower than the allowable load resistance of the propulsion pipe. However, according to the present invention, the construction is limited to a short distance. This frees you from the limitations of traditional methods.

  In FIG. 5, the propulsion transmission inner unit (8) is exemplified as having a wheel (12) and being movable.

  If the propulsion transmission inner unit is made of steel, for example, as shown in comparison with FIG. 6, the allowable load bearing capacity becomes larger than that of the reinforced concrete pipe, and it becomes possible to exceed the propulsion extension of the conventional high load bearing system. .

  Most of the propulsion pipe materials used for the low load-bearing capacity are vinyl chloride propulsion pipes, and the types of propulsion pipes include straight pipes with rib collars, straight pipes with SUS collars, and straight pipes with spiral joints.

  FIG. 7, FIG. 8, and FIG. 9 specifically explain the support of the propulsion pipe in the present invention in these three types of Japan Sewerage Association standards.

  As shown in FIG. 7, in the straight pipe with rib collar (9-1) type, the joint connection end face of the propulsion pipe is provided inside the rib collar (9-2). The vertical claw piece of the propulsion pipe support member (7) protrudes and invades into this end face, that is, a narrow gap between the rear end of the propulsion pipe and the front end of the next propulsion pipe, and inscribes the collar portion of the propulsion pipe. Meanwhile, the propulsion pipe is pressed and supported in the propulsion direction.

  In the straight pipe with SUS collar (10-1) illustrated in FIG. 8, the joint connection end face of the propulsion pipe is provided on the end face of the pipe inside the SUS collar (10-2). The vertical claw piece of the propulsion pipe support member (7) protrudes and invades into this end face, that is, a narrow gap between the rear end of the propulsion pipe and the front end of the next propulsion pipe, and inscribes the collar portion of the propulsion pipe. Meanwhile, the propulsion pipe is pressed and supported in the propulsion direction.

  In the straight pipe (11-1) with a spiral joint shown in FIG. 9, the joint connection end face of the propulsion pipe is provided at the end face of the pipe inward from the spiral joint (11-2). A vertical claw piece of the propulsion pipe support member (7) protrudes and intrudes into this end face, that is, a narrow gap between the rear end of the propulsion pipe and the front end of the next propulsion pipe. The propelling pipe is pressed and supported in the propelling direction while inscribed in the end face.

  The propulsion transmission inner unit (8) can be configured to replace the propulsion force transmission rod (4) shown in FIG. The propulsion transmission inner unit (8) shown in FIGS. 10 and 11 is such a case.

The propulsion transmission inner unit is a pipe that feeds mud and mud to the tip of the drilling blade at the tip of the tip conductor for excavation and protects it from breakage and wear, and the earth and sand excavated at the tip A pipe for sending to.
Further, the propulsion transmission inner unit has a structure in which an electric wire or a hydraulic pipe, a screw, a pipe for feeding a rod and a lubricant, etc. are passed as power for excavation. In addition, it possesses a surveying hollow part that allows laser surveying or transit surveying during straight line construction.

  As a specific example, the muddy water system will be described. For example, FIG. 10 shows a propulsion transmission inner unit in a state where a supply / discharge mud pipe (13) is provided. FIG. 11 shows an example of a propulsion transmission inner unit in the case where a propulsion pipe support member is provided. In addition to the feed and discharge mud pipe (13), the lubricant pipe (14), the power line (15), and the survey space. (16) and a state in which a retracting rod (17) of the propelling tube support member is provided.

  FIG. 12 shows a state in which the propulsion pipe support member (18) comes out (projects) by the operation of the propulsion transmission inner unit (8) provided with the propulsion pipe support member (18), and the pull-in rod (17), and is retracted. It shows the change from the closed (retracted) state.

  As illustrated in an enlarged manner in FIG. 13, for example, the advancing / retreating mechanism portion of the propulsion tube support member (18) is configured by the propulsion tube support member (18) and the retracting rod (17). The pull-in rod (17) is joined at every joint between the propulsion transmission inner unit and the propulsion transmission inner unit. When the rod is moved in the shaft as shown in FIG. 12 at the end of propulsion, the propulsion pipe support member ( 18) is pulled in and the propulsion transmission inner unit (8) can be recovered.

  FIG. 14 shows the operation further enlarged. And in the case of a straight pipe (10-1) with SUS collar, FIG. 15 shows a state in which the propelling pipe support member (18) protrudes outward to push up the SUS collar (10-2). It is the schematic diagram which showed the state which reverse | retreats.

  Such outward protrusion and inward retreat can be made possible as various mechanisms corresponding to the shape, structure, size, arrangement form, etc. of the propelling tube support member (18). For example, as shown in FIG. 16, the operation of the propelling pipe support member (18) can be performed by a hydraulic or electric jack (20).

It is a general explanatory view about the propulsion method of a high load-bearing method. It is a general explanatory view about the low load-bearing type propulsion method. It is a general explanatory view about the propulsive force and resistance force in the case of a low load-bearing force method. It is a general explanatory view of the relationship between the promotion extension of the conventional method and the peripheral surface resistance. It is explanatory drawing of the relationship between the promotion extension of this invention construction method, and surrounding surface resistance force. It is a comparison figure of this invention construction method and the conventional high load-bearing capacity system. It is a support condition figure of a plurality of straight pipes with a rib collar (propulsion pipe) continuing in the axial direction. It is a support condition figure of a plurality of straight pipes with SUS collar (propulsion pipe) continuing in the axial direction. It is a support condition figure of a plurality of straight pipes with a spiral joint (propulsion pipe) continuing in the direction of an axis. It is a general | schematic perspective view of a propulsion transmission inner unit. It is an example sectional view of a propulsion transmission inner unit. It is an illustration figure of operation | movement of a propulsion pipe support member. It is a structure schematic diagram with the drawing rod (17) of a propulsion pipe support member (8). It is an expansion section perspective view of operation of a propelling pipe support member (18). It is an expanded sectional perspective view of operation in the case of a straight pipe with SUS collar. It is an illustration sectional view of operation by jack (20).

DESCRIPTION OF SYMBOLS 1 High load-bearing capacity pipe 2 Main pushing device 3 Leader conductor 4 Propulsion transmission rod 5 Low load-bearing capacity pipe 5-1 Propulsion pipe 5-2 Propulsion pipe collar 6 Tip resistance 7 Propulsion pipe support member 8 Propulsion transmission inner unit 9-1 Rib collar Straight pipe 9-2 Rib collar 10-1 Straight pipe with SUS collar 10-2 SUS collar 11-1 Straight pipe with spiral joint 10-2 Spiral joint 12 Wheel 13 Mud pipe 14 Lubricant pipe 15 Power line 16 For surveying Hollow part 17 Pull-in rod 18 of propulsion tube support device Propulsion tube support member 20 Jack of main pushing device

Claims (6)

It is used in the propulsion method that uses the propulsion pipe material used for the low load bearing propulsion method as a propulsion pipe, and the propulsion pipe is required so that the peripheral frictional resistance between the propulsion pipe and the ground is less than the allowable load bearing capacity of the propulsion pipe. A propulsion transmission inner unit that transmits the propulsive force from the main pushing device for each number,
Projects Intrusion into the narrow gap between the front end of the rear end of the estimation Susumukan and subsequent propulsion tube, pressing the propulsion tube to the propulsion direction while inscribed in the spiral joint end face of the propulsion pipe collar or with the spiral fittings straight pipe of A propulsion tube support member having a vertical claw piece to support, and
To allow the projecting outwardly of the propulsion tube support member having a vertical pawl, and when the propulsion pipe has reached a predetermined position of the underground is to promote transfer inner unit inside of the propulsion tube support member It has an advancing / retreating mechanism that allows retreating,
a) The advancing / retracting mechanism portion includes an push-out inclined sliding surface of the operation rod that slides on the propelling tube support member and pushes the vertical claw piece outward during the push-out operation of the push-out / retraction operation rod;
b) a projection maintaining plane of the operating rod that is in surface contact with the propulsion direction plane of the propelling tube support member so as to maintain the extruded vertical claw piece in a projecting state;
c) Push-in / pull-in operation In the pull-in operation of the rod, a pulling-inclined sliding surface of the operation rod that slides in contact with the propelling tube support member and retracts the vertical claw piece inwardly;
d) a retraction maintaining plane of the operating rod that is in surface contact with the propulsion direction plane of the propulsion pipe support member so as to maintain the retracted vertical claw piece in a retracted state;
e) the propulsion pipe support member having a sliding portion that advances and retracts by operation of the push-out / retraction operation rod and a maintenance plane that is in parallel with and in surface contact with the projection / retraction maintenance plane of the operation rod;
Propulsion transmission inner unit for low load-bearing capacity scheme jacking method characterized that you include a. The advancing / retracting mechanism that allows the propulsion tube support member to project outward and retract inwardly protrudes to the right and to the left of the peripheral surface of the propulsion transmission inner unit. 2. The system according to claim 1, wherein there are three systems, that is, a part that projects and a part that projects downward, and the operation of the push-out / retraction operation rod can be performed independently for each system. Propulsion transmission inner unit for load bearing type propulsion method. The propulsion for the low load-bearing type propulsion method according to claim 1 or 2, wherein the propulsion method has a ball or a wheel and can be recovered by being pushed or pulled out after completion of propulsion by movement of the ball or wheel. Transmission inner unit.   A) A plurality of axially continuous propelling pipes,
B) Propulsion for a low load-bearing type propulsion method according to any one of claims 1 to 3, wherein a plurality of axially continuous propulsion pipes are provided in a plurality of axially continuous propulsion pipes. Transmission inner unit,
C) A leading conductor for excavation disposed at the forefront of a plurality of axially continuous propulsion pipes,
D) A main pushing device arranged at the rearmost end of a plurality of propulsion pipes continuous in the axial direction,
A low load-bearing type propulsion method apparatus characterized by comprising 5. The plurality of propulsion pipes that are continuous in the axial direction are composed of one or more of a straight pipe with a rib collar, a straight pipe with a SUS collar, and a straight pipe with a spiral joint. Equipment for low load-carrying type propulsion method. Inside the propulsion transmission inner unit are pipes for sending mud and mud to hold the face of the drilling conductor, pipes for sending excavated earth and sand, power lines such as excavation power sources, hydraulic pipes, and surveying hollows 6. The apparatus for low load resistance propulsion method according to claim 4 or 5, further comprising a connecting shaft for a push-out / retraction operation rod for the advancing / retreating mechanism portion of the propulsion pipe support member.

Images