JP3773842B2 - Muddy water propulsion method, feed / drain mud pipe and muddy water propulsion method equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a muddy water propulsion method, a sending / exhausting mud pipe, and a muddy water propulsion method apparatus, and more particularly, in a propulsion method in which an excavator and a buried pipe are propelled to the ground to lay a buried pipe, It covers the muddy water propulsion method that supplies and discharges excavated sediment together with the muddy water, and the feed and discharge mud pipe and the muddy water propulsion method device used in this muddy water propulsion method.
[0002]
[Prior art]
In the muddy water propulsion method, by supplying muddy water to the excavation site, excavation of the ground becomes easy and excavation performance can be improved. Muddy water pressure can also prevent groundwater leaching and prevent ground collapse. Since the excavated sediment is discharged together with the muddy water flow, large-scale soil removal facilities such as a sediment discharge conveyor are not required, and efficient sediment discharge is possible.
Such a muddy water propulsion method is said to be suitable for a small-diameter propulsion method for laying a relatively small-diameter buried pipe.
Although there is a technique in which a mud pipe and a mud pipe are separately provided as a mud pipe used in the muddy water propulsion method, a double pipe composed of an inner pipe and an outer pipe has been proposed. Usually, the supplied mud is passed between the outer pipe and the inner pipe, and the discharged mud containing earth and sand is passed through the inner pipe. The double pipe type feed / drain mud pipe does not take up space and is suitable for the small-diameter propulsion method.
[0003]
In the propulsion method, it may be necessary to correct the propulsion direction or propulsion path of the excavator. Even if the transmission direction of the thrust by the main push jack is accurately set and correction is made by the direction correction jack provided for the excavator, the propulsion direction and design route of the excavator will depend on the ground conditions propelled by the excavator. The deviation from the above may exceed the allowable range.
In this case, the excavator and the buried pipe row in the ground are slightly retracted in the original direction to correct the propulsion direction, and then the excavator is propelled again.
In order to retract the excavator during the propulsion work, connect the wire or PC steel to the excavator and pass it through the buried pipe, pull the wire or PC steel from the start shaft side, and retract the excavator. Yes.
[0004]
[Problems to be solved by the invention]
In the above-described conventional propulsion method, the work of retracting the excavator during the propulsion work is a very time-consuming and time-consuming work.
When the buried pipe row is long, it is troublesome to carry in and install wires and PC steel materials from the starting shaft side to the excavator. In particular, in the small-diameter propulsion method in which the operator is difficult to move, the operation is extremely difficult. At the start of the propulsion method, wire and PC steel are attached to the excavator, and each time the buried pipe is added, the wire and PC steel are also added or extended, but the work of working inside the buried pipe can be saved. The inside of the buried pipe having no space is always occupied by the wire or the PC steel material, which interferes with other operations and eliminates the installation space for necessary equipment.
[0005]
The problem of the present invention is that in the muddy water propulsion method described above, when the excavator needs to be retracted during the propulsion operation, the excavator can be efficiently retracted, which hinders the original propulsion method. In other words, it is possible to prevent the occurrence of a gap in the buried pipe.
[0006]
[Means for Solving the Problems]
  According to the present inventionMud pipeIs a mud-water propulsion method in which the excavator and the buried pipe connected to the back of the excavator are propelled while excavating the ground with the excavator, supplying mud water to the excavation site of the ground by the excavator, and discharging the excavated earth and sand together with the mud waterA sludge pipe used for
  It is a double pipe composed of an inner pipe that discharges muddy water and an outer pipe that supplies muddy water on the outside, and is arranged at both ends, and it is a bent connection part that connects the inner pipes and outer pipes so that they can be bent in a watertight state. And a tensile force transmission part that is disposed at both ends and transmits a tensile force between the supply and discharge mud pipes,
  The bent connecting portion is disposed at one end of the inner tube and the outer tube, and a convex end portion whose outer periphery swells in a barrel curved shape is disposed at an opposite end portion of the inner tube and the outer tube. A concave end portion having a cylindrical inner surface into which the portion is inserted, and a watertight ring that is attached to the cylindrical inner surface of the concave end portion and slides in contact with the outer peripheral surface of the convex end portion,
  The tensile force transmitting portion has a male screw portion provided on the outer peripheral surface of the concave end portion of the outer tube, and has a female screw portion screwed into the male screw portion on the inner peripheral surface. And the latching nut which has a latching edge hooked by the convex end part of an outer tube | pipe is provided in the end of an axial direction.
[0007]
[Muddy water propulsion method]
Basically, the same process and working conditions can be adopted using the same equipment and materials as in the ordinary mud water propulsion method.
In the propulsion method, the excavating machine and the buried pipe connected to the rear thereof are propelled while excavating the ground with the excavating machine. The structure of the excavator and the material of the buried pipe are not particularly limited.
Examples of the buried pipe include a fume pipe, a steel pipe, an FRP pipe, a synthetic resin pipe, and a ceramic pipe. The diameter of the buried pipe can be applied to the range of 250 to 1500 mm, and the length of the buried pipe varies depending on the conditions such as the diameter of the buried pipe and the diameter of the sending and discharging mud pipe to be used. Yes.
[0008]
In the muddy water propulsion method, muddy water is supplied to the ground excavation site by the excavator and the excavated soil is discharged together with the muddy water. For this purpose, a supply / discharge mud pipe that supplies and discharges mud water is used, and a plurality of supply / discharge mud pipes are sequentially connected in the axial direction.
The muddy water used in the muddy water propulsion method may be simply a mixture of mud or a viscosity modifier. The amount of mud supply is determined by the drilling conditions and the capacity of the mud pipe.
[Transmission mud pipe]
Basically, it has the same material and structure as the sending and discharging mud pipe used in the ordinary mud propulsion method.
[0009]
The material of the feed / discharge mud pipe is generally a steel pipe, but an FRP pipe or a synthetic resin pipe is also used. However, it is necessary to have strength to withstand the tensile force applied when the excavator is moved backward.
The diameter of the sending and discharging mud pipe is set in accordance with the amount of muddy water to be circulated or muddy water containing earth and sand. Usually, the diameter is set in the range of 50 to 200 mm.
The supply and discharge mud pipes are successively added to those manufactured to a certain length to form a supply and discharge mud pipe array having a required length. Usually, the length of one sending and discharging mud pipe is set in a range of about 1 to 3 m.
[0010]
At both ends of the feed / drain mud pipe, a connection structure for connecting the feed / drain mud pipes in a watertight state is provided. As a connection structure, a connection structure by fitting, screwing, or the like can be adopted as in various normal pipes. However, a structure that can transmit a tensile force between the sending and discharging mud pipes at the connecting portion is adopted. The magnitude of the tensile force that can be transmitted is set to a load necessary for moving the entire excavator and the buried pipe row backward in the ground. It is preferable that a sealing member that can ensure water tightness such as an O-ring or packing is attached to the connecting portion.
In order to cope with the curve propulsion, a curved pipe is used as a sending and discharging mud pipe, or a straight pipe is bent and connected. It is preferable to provide a bendable structure at the connecting portion between the supply and discharge mud pipes. As a structure of such a bending connecting portion, a mechanism or an apparatus that can bend various types of pipes that are also employed in a normal bending propulsion method can be applied.
[0011]
The feeding / draining mud pipe may have a mud feeding pipe that supplies mud and a mud pipe that discharges mud containing the excavated sediment, but the inner and outer pipes are arranged concentrically. It is preferable to use a double tube.
The material of the inner pipe and the outer pipe constituting the double pipe may be the same as that of a normal sending and discharging mud pipe. In order to arrange the inner tube and the outer tube in a concentric manner with a space between each other, the inner tube and the outer tube are coupled via a spacing member. When the inner tube and the outer tube are detachably coupled, it is easy to clean and wash the inside. If necessary, it is possible to use only the outer tube.
The diameter of the inner pipe is set according to the amount of muddy water or the like circulated inside, and the diameter of the outer pipe is set according to the amount of muddy water or the like circulated in the gap with the inner pipe.
[0012]
In the feed and discharge mud pipe consisting of double pipes, any flow path inside or outside may be used for the mud feed pipe and the mud pipe, but normally the inner pipe is used for discharge and the gap between the outer pipe and the inner pipe is used. Is preferably used for the supply.
[Double pipe connection structure]
When the feed / drain mud pipe is composed of a double pipe composed of an inner pipe and an outer pipe, the connection structure between the feed / drain mud pipes is such that the inner pipe and the outer pipe can be bent as described above. Or a structure capable of transmitting a tensile force. Specifically, the following structure can be adopted.
[0013]
As the bending connecting portion, the convex end portion is disposed at one end of the inner tube and the outer tube, and the outer periphery is bulged into a barrel curved shape, and is disposed at the opposite end portion of the inner tube and the outer tube, and the convex end portion. And a watertight ring that is attached to the cylindrical inner surface of the concave end portion and slides in contact with the outer peripheral surface of the convex end portion.
The convex end portion and the concave end portion are made of the same material as that of the feed / discharge mud pipe.
It is preferable to set the curvature of the barrel curved surface at the convex end portion in accordance with the bending angle of the outer tube or the inner tube.
As the watertight ring, a sealing member in a normal watertight structure such as an O-ring can be used. The watertight ring can be made of metal, rubber, synthetic resin, fiber material, or the like.
[0014]
As the tensile force transmission part, a male screw part provided on the outer peripheral surface of the concave end part of the outer tube, and the whole has a cylindrical shape, and an inner peripheral surface has a female screw part screwed into the male screw part, One end in the axial direction can be provided with a latching nut having a latching edge hooked on the convex end portion of the outer tube.
As the male screw portion and the female screw portion, a screw structure in a normal mechanical device or piping structure can be applied. A screw structure having a large axial transmission force is preferred. For example, a square screw is employed.
The size of the transmission force and the difficulty of loosening can be adjusted by setting the conditions such as the screw shape, height, and pitch. Specifically, various industrial standards and technical data can be adopted.
[0015]
A material similar to a normal nut material is used for the latch nut as long as it can withstand the tensile force applied.
The larger the area when the latching edge is in contact with the convex end portion, the larger the tensile force can be transmitted. The greater the thickness of the retaining edge, the greater the load bearing capacity. The latching edge does not need to be always in contact with the convex end portion, and only needs to be hooked on the convex end portion only when a tensile force is transmitted. The latching edge may be hooked on the convex end portion around the entire circumference, or a part of the circumferential direction may be hooked on the convex end portion within a range in which a necessary tensile force can be transmitted.
[Digging machine]
Basically, one having the same structure as a normal mud propulsion method is used.
[0016]
The excavator is provided with a mechanism structure necessary for a normal muddy water propulsion method, such as a rotary excavator equipped with a drill bit, a drive motor, and a pressure chamber. A direction correction jack, surveying equipment, etc. can be provided.
The excavator is provided with a pipe fixing portion for fixing the tip of the feed / discharge mud pipe. A pipe fixing part is comprised with the strong structural member which can endure the tensile force added when retracting an excavation machine, and can fix a sending and discharging mud pipe.
The excavator is provided with a mud passage for feeding mud supplied from the feed / drain mud pipe to the excavation surface and a mud passage for returning the earth and sand discharged from the excavation surface to the feed mud pipe together with the mud. It is preferable that the structural members of the mud passage and the waste mud passage should not be subjected to the tensile force that accompanies the retreating operation of the excavator, and the mud passage and the mud passage are located in front of the pipe fixing part. It should be provided.
[0017]
In the front part of the excavator, a pressure chamber can be provided that is partitioned by a rear part and a partition, and whose front faces the excavation surface. By pumping muddy water into the pressure chamber, it is possible to counter the pressure from the ground and the leaching water pressure. The excavated earth and sand can be mixed with muddy water in the pressure chamber and discharged.
[Applying tensile force]
If a tensile force capable of retracting the excavator and the buried pipe row is applied to the rear end side of the feed / drain mud pipe row, a tensile force applying means or device in a normal civil engineering device or the like can be employed.
Normally, a tensile force applying device is installed in the starting shaft where the propulsion work is started. A tensile force can be transmitted from the ground surface with a winch or the like via a chain or a wire.
[0018]
The tensile force application device is provided with a mechanism capable of transmitting the force in the tensile direction by gripping or locking the rear end side of the feed / discharge mud pipe. The force may not be transmitted in the direction opposite to the tensile direction. The rear end of the pipe is connected to a muddy water supply channel that supplies muddy water from the surface muddy water tank and a muddy water discharge channel that is connected to the surface discharge muddy water treatment device. In addition, it is preferable to apply a tensile force to the feed / discharge mud pipe so as not to obstruct the muddy water discharge path.
A jack device driven by hydraulic pressure or water pressure can be used as an application device for the tensile force. It is also possible to apply a tensile force to the feeding / discharging mud pipe by operating a push jack for applying a propulsive force to the rear end of the excavator and the buried pipe row in a direction opposite to the propulsion operation.
[0019]
[Supporting the feed / drainage pipe]
As long as the leading end of the feed / drain mud pipe is supported by the excavator and the rear end is supported by the tensile force application device, it may not be supported by the buried pipe in the middle.
Usually, the material of the buried pipe is strong against the external force in the compression direction applied during the propulsion work, but often does not have the tensile strength in the tensile direction. Therefore, it is possible to prevent the buried pipe from being damaged by the tensile force by not transmitting the tensile force applied during the backward operation to the buried pipe.
If the feeding / discharging mud pipe is supported so as to be movable in the axial direction with respect to the buried pipe, even if a tensile force is applied to the sending / draining mud pipe, it is not transmitted to the buried pipe. If the weight of the feed / drain mud pipe is supported by the buried pipe, even when a long-distance propulsion method is performed, the middle of the feed / drain mud pipe row does not sag or excessive bending stress is generated.
[0020]
Specifically, the lower part of the sending and discharging mud pipe can be supported so as to be slidable in the axial direction with respect to the inner bottom face of the buried pipe. A roller, roller, ball bearing or the like that can roll in the axial direction can be disposed between the feed / drain mud pipe and the buried pipe. A sliding plate or a sled member having a small friction coefficient can be provided in the lower part of the feed / discharge mud pipe.
The sending and discharging mud pipe can freely move in the axial direction with respect to the buried pipe, but is preferably arranged so as to be within a certain position or range in the cross-sectional direction. Usually, the mud pipe is placed at the center of the bottom of the buried pipe. When the feed / drain mud pipe is slidably supported along the arc-shaped inner bottom surface of the buried pipe, it is automatically placed at the center of the inner bottom face of the buried pipe due to its own weight. .
[0021]
A guide member that restricts movement of the feed / discharge mud pipe in the cross-sectional direction may be provided inside the buried pipe.
[Muddy water propulsion method]
Basically, the same work process as a normal muddy water propulsion method is adopted.
The construction of the shaft, the installation of the main push jack device, the carrying of the excavator and the buried pipe row and the propulsion work to the ground may be the same as the normal propulsion method.
Installation of the supply and discharge mud pipes is carried out in the same manner as the normal mud water propulsion method. However, the tip of the feed and discharge mud pipe is fixed to the pipe fixing part of the excavator. The rear end of the feeding / discharging mud pipe may be supported by a tensile force application device, or may be separated from the tensile force application device in a case other than the reverse operation of the excavator.
[0022]
While driving the rotary excavator of the excavator and excavating the ground with the excavator, a driving force is applied to the excavator and the buried pipe row with a push jack device, etc., and the excavator and the buried pipe row are propelled into the ground. Let Muddy water is supplied to the excavation site by the excavator from the sending and discharging mud pipe, and the excavated soil is discharged together with the muddy water. The muddy water containing the discharged earth and sand is separated from the muddy water and the muddy water by a processing device installed on the ground surface or the like, and is subjected to a soil discharge treatment.
[Retracting the excavator]
If the propulsion work is performed exactly according to the design route, it may not be necessary to move the excavator backward. However, under normal working conditions, the propulsion path deviates from the design path as the propulsion work proceeds, and the propulsion direction and the propulsion path need to be corrected.
[0023]
Therefore, the excavator and the buried pipe row are moved backward in the direction opposite to the propulsion direction, and the work for correcting the attitude and the propulsion direction of the excavator is performed.
When the excavator is moved backward, a tensile force is applied to the rear end side of the feed / drain mud pipe row, and the excavator fixed to the feed / drain mud pipe row is pulled back and moved backward.
What is necessary is just to attach a rear end side of a sending and discharging mud pipe to a tensile force application device so that a tensile force can be applied at a stage when the excavator needs to move backward. It is also possible to operate the jack in the direction opposite to the propulsion direction by fixing the feed / discharge mud pipe to the main pushing jack used for the propulsion work.
[0024]
The magnitude of the tensile force required for retreating the excavator varies depending on conditions such as the ground condition and the propulsion distance, but is usually in the range of 200,000 to 1,000,000N. Therefore, the tensile force transmission part of the feed / discharge mud pipe and the pipe fixing part of the excavator need to have a resistance to the tensile force actually applied within the above range.
The receding distance of the excavator may be a distance that can correct the attitude and propulsion direction of the excavator as described above, and usually the receding distance may be within a range of up to 100 m.
After the excavator has been retracted, it is only necessary to cancel the connection between the tensile force application device and the supply / discharge mud pipe or prevent the tensile force from being transmitted. After changing the propulsion direction and attitude of the excavator using a direction-correcting jack, resume normal propulsion work.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
In the muddy water propulsion method shown in FIG. 1, the excavator 10 and the buried pipe 20 are propelled from the inner wall of the vertical shaft H dug down from the ground surface to the ground E toward the ground E in the horizontal direction. The underground pipe 20 is buried in the ground E while excavating the ground.
[Digging machine]
The entire excavation machine 10 has a cylindrical shape. A rotary excavator 12 in which a drill bit or the like is planted is provided at the tip. The rotary excavator 12 is rotationally driven by a drive motor 14 disposed on the rear side. The back surface of the rotary excavator 12 is a pressure chamber 13 partitioned by a partition wall 11. The muddy water is pumped into the pressure chamber 13 to counteract the earth pressure, thereby preventing the excavation surface from collapsing and preventing leachate. The earth and sand excavated by the rotary excavator 12 is mixed with muddy water in the pressure chamber 13 and discharged together with the muddy water.
[0026]
A pipe fixing partition wall 16 is provided on the rear side of the excavating machine 10. The pipe fixing partition 16 is firmly joined to the outer structure of the excavator 10 by welding or the like, and is provided with a reinforcing rib or the like to ensure deformation resistance. A fixed feed / drainage pipe 40 is fitted into the pipe fixing partition wall 16 and is fixedly coupled by a fixing nut 42 or the like.
The fixed feed / mud pipe 40 is a double pipe similar to the feed / drain mud pipe 30 described in detail later. A branched mud pipe 46 and a branched mud pipe 44 are connected to the distal end side of the fixed feed mud pipe 40. The branch mud pipe 46 and the branch mud pipe 44 are open to the pressure chamber 13. The rear end of the fixed feed mud pipe 40 is connected to the feed mud pipe 30.
[0027]
A buried pipe 20 made of a fume pipe or the like is disposed behind the excavator 10. The buried pipes 20 are sequentially arranged to constitute a buried pipe row. The rearmost buried pipe 20 faces the shaft H.
[Transmission / drainage structure]
The feed / drain mud pipe 30 is a steel double pipe, a plurality of which are sequentially connected and pass through the buried pipe 20, and the tail end faces the shaft H.
The feed / drain mud pipe 30 is supported on the inner bottom surface of the buried pipe 20 via the support roller 110, and the feed / drain mud pipe 30 can move with little resistance in the axial direction with respect to the buried pipe 20.
[0028]
The rear end of the feeding / discharging mud pipe 30 is connected to a fixed feeding / discharging mud pipe 50 arranged in the shaft H. The fixed feed mud pipe 50 is also a double pipe. The fixed feed mud pipe 50 is coupled and fixed to the support board 54 with a fixing nut 54 or the like.
The support board 52 is attached to the operating shaft of the tension jack 60 installed in the shaft H. The tension jack 60 is installed on the fixed side wall 62 of the shaft H. By contracting the operating shaft of the tension jack 60, a tensile force can be applied to the fixed feed mud pipe 50 via the support board 54.
A mud feed hose 58 and a mud hose 56 are connected to the rear end of the fixed feed mud pipe 50. The mud feeding hose 58 and the mud draining hose 56 are connected to a mud supply device and a mud treatment device installed on the ground surface.
[0029]
[Detailed structure of sending and discharging mud pipe]
As shown in FIG. 2, the feed / discharge mud pipe 30 is a double pipe composed of an inner pipe 32 and an outer pipe 34 each made of a steel pipe. As a specific example of the feed / discharge mud pipe 30, a steel outer pipe 34 having a diameter of 99 mm (outer diameter) and a thickness of 4 mm is combined with a steel inner pipe 32 having a diameter of 60.5 mm (outer diameter) and a thickness of 2.3 mm, The total length can be set to about 1.2m. This sending / discharging mud pipe 30 can be used for the buried pipe 20 having a diameter of 400 mm, for example.
The inner tube 32 and the outer tube 34 are arranged concentrically with a spacing plate 36, 37 arranged in the radial direction. As shown also in FIG. 3, the spacing plates 36 and 37 are arranged with their surface directions parallel to the axial direction of the sending and discharging mud pipe 30, and a fluid flows in the space between the outer pipe 34 and the inner pipe 32. It can pass freely.
[0030]
As will be described later, the outer tube 34 and the inner tube 32 are assembled so as to be freely inserted and removed in the axial direction, and the outer tube 34 and the inner tube 32 can be separated as necessary.
<Convex end>
At the end portion disposed on the excavator 10 side when the feed / discharge mud tube 30 is used, the end portion of the outer tube 34 is provided with a convex end portion 70 protruding to the outer peripheral side. The outer peripheral surface of the convex end portion 70 has a barrel curved shape in which the center in the axial direction is high and decreases toward both sides. Similarly to the outer tube 34, the end portion of the inner tube 32 is also provided with a convex end portion 74 whose outer peripheral surface forms a barrel curved shape.
[0031]
<Latch nut>
A latch nut 100 is disposed on the outer periphery of the convex end portion 70 of the outer tube 34.
The latch nut 100 is made of a steel material or the like, and has a tubular shape as a whole. On the inner surface of the latching nut 100, there is a female screw 102 made of a square screw composed of square ridges and valleys.
An end of the latching nut 100 that is the central side of the feed / discharge mud pipe 30 has an annular latching edge 106 that extends toward the center. The inner peripheral edge of the latching edge 106 is disposed on the center side of the outer diameter of the convex end portion 70 of the outer tube 34 and on the outer side of the outer tube 34.
[0032]
Therefore, the latching nut 100 can move freely in the axial direction of the feeding / discharging mud pipe 30 and cannot be pulled out from the front end side of the feeding / discharging mud pipe 30, and is handled in a form attached to the feeding / discharging mud pipe 30. It will be.
The outer peripheral surface of the latching nut 100 is formed with a groove extending in the axial direction, and has rotating grooves 104 arranged at a plurality of locations at intervals in the circumferential direction. If the turning groove 104 is turned and hooked and turned, the retaining nut 100 can be strongly tightened or loosened easily.
<Concave end>
A concave end member 80 is attached to the outer pipe 34 at the end of the feed / drain mud pipe 30 opposite to the convex ends 70 and 74.
[0033]
The concave end member 80 is made of the same steel material as that of the outer tube 34, and has a cylindrical shape extending in the horizontal direction after being expanded from the attachment side to the outer tube 34 to the outer peripheral side. A male screw 82 to be screwed into the female screw 102 of the latching nut 100 is provided on the outer peripheral surface of the tip of the concave end member 80. Of course, the male screw 82 is also a square screw. On the inner side of the concave end member 80, there is an inner peripheral cylindrical surface 84 having a cylindrical surface shape. A circumferential groove 85 is formed in the middle of the inner peripheral cylindrical surface 84. An O-ring 86 is attached to the circumferential groove 85.
On the side of the concave end member 80 close to the outer tube 34, the interval holding plate 36 is disposed. The spacing plate 36 is fixed to the outer peripheral surface of the inner tube 32 by welding or the like. In the axial direction of the feed / discharge mud pipe 30, one end side of the spacing plate 36 is in contact with a step formed on the inner peripheral surface of the concave end member 80. A support ring 38 is fixed to the other end side of the spacing plate 36. A resiliently deformable retaining ring 39 made of a C-shaped retaining ring or the like is mounted on the inner periphery of the concave end member 80 outside the support ring 38, and the spacing plate 36 and the support ring 38 are fixed to the concave end member 80. Yes. The interval holding plate 36 is fixed to the concave end member 80 and the outer tube 34 in the axial direction, whereby the inner tube 32 is fixed to the outer tube 34 in the axial direction.
[0034]
A concave end member 90 is also attached to the end of the inner tube 32. The concave end member 90 of the inner tube 32 also includes an inner peripheral cylindrical surface 92, a peripheral groove 95, and an O-ring 94, similarly to the concave end member 80 of the outer tube 34. However, no male screw is provided.
The interval holding plate 37 on the side close to the convex end portion 70 is fixed to the outer peripheral surface of the inner tube 32 by welding or the like, but is not fixed to the outer tube 34. Therefore, when the retaining ring 39 is removed on the concave end member 80 side, the interval holding plate 36, the support ring 38, the inner tube 32 and the interval holding plate 37 are integrally extracted from the inside of the outer tube 34. The inner tube 32 and the outer tube 34 can be separated. This facilitates inspection and repair and replacement of the inner tube 32 and the outer tube 34.
[0035]
<Support roll>
As shown in detail in FIG. 3, a support roll 110 is provided at the lower portion of the feed / discharge mud pipe 30.
The support rolls 110 are disposed on the left and right in the cross-sectional shape of the feed / discharge mud pipe 30 and are in contact with the inner bottom surface of the buried pipe 20. The support roll 110 is pivotally supported at both ends by the support materials 112 and 112, and the support materials 112 and 112 are fixed to the feed and discharge mud pipe 30.
Since the left and right support rolls 110, 110 arranged in a C shape at the bottom of the feed / drain mud pipe 30 are in contact with the inner bottom surface of the buried pipe 20 at the lower center, the feed / drain mud pipe 30 is a buried pipe. It is automatically arranged at the center of the inner bottom surface of 20. Even if the feeding / discharging mud pipe 30 is not fixed to the buried pipe 20, it is possible to prevent the feeding / draining mud pipe 30 from being bent or moved greatly within the buried pipe 20.
[0036]
When a tensile force is applied to the feed / drain mud pipe 30, the tensile force is transmitted to the excavator 10 to which the feed / drain mud pipe 30 is fixed, but no tensile force is transmitted to the buried pipe 20. Accordingly, it is possible to prevent the embedded tube 20 from being damaged due to an excessive tensile force applied to the embedded tube 20.
<Shelves>
As shown in FIG. 3, shelf members 120 are attached to both sides of the feed / discharge mud pipe 30 and are made of steel plates and the like, and the cross section is L-shaped and extends in the axial direction of the feed / drain mud pipe 30. ing.
[0037]
On the shelf member 120, a power supply cable or a communication cable for the excavator 10 can be placed. When the excavator 10 is moved backward, a cable or the like is caught on the feed / drain mud pipe 30 or the support roller 110, and the tensile force is not effectively transmitted to the excavator 10, or the cable is damaged by the tensile force. Can be prevented.
[Connection of feed and discharge mud pipe]
The feed / discharge mud pipe 30 can connect the inner pipes 32 and the outer pipes 34 so that they can be bent.
As shown in FIG. 4, the convex end portions 70, 74 of the other sending / discharging mud pipe 30 are inserted into the concave end members 80, 90 of one sending / discharging mud pipe 30.
[0038]
The barrel curved surface of the convex end portion 70 provided in the other outer pipe 34 faces the inner peripheral cylindrical surface 84 of the concave end member 80 provided in one outer pipe 34. The O-ring 86 of the concave end member 80 is in contact with the barrel curved surface of the convex end portion 70, thereby connecting the two in a watertight state.
The barrel curved surface of the convex end portion 74 provided in the other inner tube 32 faces the inner peripheral cylindrical surface 92 of the concave end member 90 provided in the one inner tube 34. The O-ring 94 of the concave end member 90 is brought into contact with the barrel curved surface of the convex end portion 74 so that both are connected in a watertight state.
The latching nut 100 is fastened and fixed to the concave end member 80 by screwing the female screw 102 of the latching nut 100 into the female screw 82 of the concave end member 80 provided in the counterpart sending / discharging mud pipe 30. The inner side surface of the latching edge 106 of the latching nut 100 abuts on the tip surface of the concave end member 80.
[0039]
In this state, the feeding / discharging mud pipes 30 on both sides are connected. However, since the convex end portion 70 of the outer tube 34 is disposed in the axial space between the concave end member 80 and the latching edge 106 of the latching nut 100, the convex end portion 70 becomes the concave end member 80. The convex end portion 70 is relatively movable in the axial direction until it comes into contact with the inner side surface of the rim and the retaining edge 106. In other words, the sending and discharging mud pipes 30 can also relatively move in a certain range in the axial direction.
Even if the feed and discharge mud pipes 30 move relative to each other in the axial direction, the O-ring 86 elastically abuts against the convex end portion 70 of the outer pipe 34, so that the water tightness of the connection point is maintained. Also for the inner tube 32, water tightness can be maintained by elastic contact between the O-ring 94 and the convex end portion 74.
[0040]
When carrying out the propulsion work, at the rear end of the buried pipe 20 propelled first, the concave end members 80, 90 at the rear end of the feed / drain mud pipe 30 are connected to the convex ends 70, 90 If 74 is inserted and the latching nut 100 is screwed into the outer periphery of the concave end member 80, the feeding / discharging mud pipe 30 can be sequentially connected.
In addition, the same connection structure as the concave end members 80 and 90 of the feed / sludge mud pipe 30 is provided at the rear end of the fixed feed / sludge pipe 40 of the excavator 10. At the tip of the fixed feed mud pipe 50 arranged in the shaft H, the same connection structure as the convex end portions 70 and 74 of the feed mud pipe 30 and the latch nut 100 is provided. As a result, the feeding / discharging mud pipe 30 can be easily connected.
[0041]
[Disconnection of feed / drain mud pipe]
In order to release the connection from the connected state of FIG. 4, the latch nut 100 is loosened and the connection with the mating concave end member 80 is released.
Thereafter, when the convex end portions 70 and 74 are slid with the O-rings 86 and 94 and pulled out in the axial direction, the connection between the feeding and discharging mud pipes 30 is released.
When the propulsion work is completed and the sending / discharging mud pipe 30 is removed from the inside of the buried pipe 20, the retaining nut 100 may be removed and the sending / discharging mud pipe 30 may be pulled out.
[Transmission of tensile force]
When the excavator 10 is moved backward in the connected state of FIG. 4, a tensile force is applied from the rear supply / discharge mud pipe 30 to the front supply / discharge mud pipe 30. A tensile force is applied in the direction of the white arrow labeled “retreat” in the figure.
[0042]
When the convex end portion 70 moves in the pulling direction, the side end surface of the convex end portion 70 comes into contact with the inner side surface of the latching edge 106 of the latching nut 100. As a result, a tensile force is transmitted from the convex end portion 70 to the concave end member 80 of the mating supply / discharge mud pipe 30 through the latching nut 100.
Since the latch nut 100 and the concave end member 80 are coupled with each other by a female screw 106 and a male screw 82 which are square screws, even if a large tensile force is applied, the screw is loosened or the screw thread is damaged. There is nothing to do. The whole can be retreated against the large resistance force caused by the frictional resistance between the entire weight of the excavator 10 and the buried pipe row and the ground E.
[0043]
[Bend of feed / drain mud pipe]
As shown in FIG. 5, even if the front and rear mud pipes 30 and 30 are bent by an angle θ, the connected state can be maintained and water tightness is ensured.
Such bending of the supply / discharge mud pipe 30 occurs when the curve propulsion method is performed. In the curved propulsion method, when the excavator 10 is propelled along a curved path, the subsequent buried pipes 20 are also sequentially propelled along the curved path, and the front and rear buried pipes 20 are bent to have a certain angle. Become. When the excavator 10 is retracted by the curve propulsion method, the excavator 10 and the buried pipe row are retracted along the curved path.
[0044]
When the feeding / discharging mud pipe 30 arranged on the rear side is bent with respect to the feeding / discharging mud pipe 30 on the front side, in the outer pipe 34, the O-ring 86 is in contact with the convex end portion 70. The watertight function by the O-ring 86 is maintained only by changing the contact position of the barrel curved surface of the convex end portion 70 with respect to 86.
Similarly, also in the inner tube 32, the watertight function of the O-ring 94 is maintained only by changing the contact position of the barrel curved surface of the convex end 74 with respect to the O-ring 94.
Furthermore, since the latching edge 106 of the latching nut 100 is hooked on the convex end portion 70 of the outer tube 34 even in the bent state, the tensile force can be transmitted in the bent state.
[0045]
[Promotion work]
The propulsion work is carried out in the same way as a normal muddy water propulsion method.
If the excavator 10 is carried into the shaft H, placed on the inner wall of the shaft H, and the propulsion force is applied with a main jack while the rotary excavator 12 of the excavator 10 is driven to rotate, It is propelled horizontally from the inner wall of the shaft H to the inside of the ground E.
If the buried pipe 20 is arranged behind the excavating machine 10 and a driving force is applied to the rear end side by a push jack similarly to the above, the buried pipe 20 is pushed into the ground E following the excavating machine 10.
[0046]
At the rear part of the excavating machine 10 and the buried pipe 20 row, a new feed / drain mud pipe 30 is disposed at the rear end of the fixed feed / drain mud pipe 40 or the previously connected feed / drain mud pipe 30. Link. A new buried pipe 20 may be connected to the rear end of the row of buried pipes 20 on the outer periphery after the feed / drain mud pipe 30 is added, or after a new buried pipe 20 is added, 30 may be added, or the buried pipe 20 and the supply / discharge mud pipe 30 may be added as a set. The feed / mud pipe 30 and the buried pipe 20 can be smoothly inserted and moved by the support roll 110 provided in the feed / drain mud pipe 30.
A fixed feeding / draining mud pipe 50 in the shaft H is connected to the rear end of the row of feeding / draining pipes 30. The mud supplied from the mud feeding hose 58 flows between the outer pipe 34 and the inner pipe 32 of the feeding / discharging mud pipe 30 and passes from the fixed feeding / discharging mud pipe 40 of the excavator 10 through the branching mud pipe 46. The pressure chamber 13 is pumped.
[0047]
The mud mixed with excavated sediment in the pressure chamber 13 circulates from the branch drainage pipe 44 through the fixed feed / mud pipe 40 and the inner pipe 32 of the feed / drain mud pipe 30, and the fixed feed / drain mud pipe 50 of the shaft H. Is discharged through a mud hose 56.
The propulsive force applied by the main push jack may be transmitted to the excavating machine 10 from the row of buried pipes 20, and it is not necessary to apply the propulsive force to the sending and discharging mud pipe 30. Since the leading end of the thirty rows of the feed / discharge mud pipes is fixed to the excavator 10, it moves together with the excavator 10.
While repeating the above propulsion work, laser surveying, magnetic exploration from the ground surface, and the like are performed to measure the propulsion positions and directions of the excavator 10 and the buried pipe 20.
[0048]
Based on the result, if the deviation of the propulsion path from the design path becomes large, the excavation machine 10 and the buried pipe 20 row are moved backward in order to correct the propulsion direction.
[Backward operation]
As shown in FIG. 1, the fixed feeding / discharging mud pipe 50 at the rear end of the feeding / discharging mud pipe 30 row is fixed to the support board 52, and the tension jack 60 is operated.
Tensile force is transmitted from the tension jack 60 to the 30 rows of the exhaust mud pipes. A tensile force is transmitted between the feeding and discharging mud pipes 30 via the latch nut 100. Tensile force is transmitted to the excavator 10 from the leading end of the 30 rows of feed / drain mud tubes through the fixed feed / drain mud tube 40 and the pipe fixing partition wall 16.
[0049]
The excavator 10 and the buried pipe 20 row move backward in the ground E in the direction of the vertical shaft H opposite to the propulsion direction. In order to retract the excavator 10 and the buried pipe 20 row, it is necessary to apply a tensile force corresponding to the weight of the excavator 10 and the buried pipe 20 row and the frictional resistance of the ground E. Since only the force in the compression direction from the excavator 10 is applied to the buried pipes 20 row, there is no fear that the buried pipes 20 are damaged due to excessive tensile stress.
When the excavator 10 and the buried pipe 20 line move backward by a predetermined distance, the operation of the tension jack 60 is stopped and the backward work is finished.
The propulsion operation described above is started again after adjusting the propulsion direction of the excavator 10 to return to the correct propulsion path by extending or contracting the direction correcting jack of the excavator 10 or changing the posture of the excavator 10.
[0050]
【The invention's effect】
  Of the present inventionUsing an exhaust pipeIn the muddy water propulsion method, when the excavator in the ground is retreated, a tensile force is applied to the muffler pipe row that supplies and discharges muddy water. Let Since the feed / drain mud pipe is originally a structure provided inside the buried pipe for supplying and discharging mud water, it is not necessary to install an extra structure or mechanism device in the buried pipe. As a result, it is possible to perform the retreating work of the excavator without pressing the space in the buried pipe.
  Each time the excavator moves backward, it does not require the trouble of installing a tensile force transmission member such as a wire or PC steel material in the buried pipe, and the propulsion operation can be interrupted to immediately perform the backward operation. . After the reverse operation is completed, the propulsion operation can be started again quickly.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a muddy water propulsion method representing an embodiment of the present invention.
[Figure 2] Enlarged cross-sectional view of the supply and discharge mud pipe
FIG. 3 is a sectional view showing an arrangement state in a buried pipe
FIG. 4 is a cross-sectional view showing a connected state of the feed / discharge mud pipe
FIG. 5 is a cross-sectional view showing a bent state of the connecting portion of the feed / discharge mud pipe
[Explanation of symbols]
10 digging machine
12 Rotating excavator
13 Pressure chamber
16 Tube fixing bulkhead
20 buried pipe
30 Mud pipe
32 Inner pipe
34 Outer pipe
44 Branch drainage pipe
46 Branch mud pipe
52 Support board
56 Mud hose
58 Mud hose
60 Tensile jack
100 Latch nut

Claims (5)

While excavating the ground with the excavator, the excavator and the buried pipe connected to the back of the excavator are propelled, mud is supplied to the excavation site of the ground by the excavator, and used for the mud propulsion method that discharges the excavated earth and sand together with the mud. A mud pipe,
It is a double pipe composed of an inner pipe that discharges muddy water and an outer pipe that supplies muddy water on the outside, and is arranged at both ends, and it is a bent connection part that connects the inner pipes and outer pipes so that they can be bent in a watertight state. And a tensile force transmission part that is disposed at both ends and transmits a tensile force between the supply and discharge mud pipes,
The bent connecting portion is disposed at one end of the inner tube and the outer tube, and a convex end portion whose outer periphery swells in a barrel curved shape is disposed at an opposite end portion of the inner tube and the outer tube. A concave end portion having a cylindrical inner surface into which the portion is inserted, and a watertight ring that is attached to the cylindrical inner surface of the concave end portion and slides in contact with the outer peripheral surface of the convex end portion,
The tensile force transmitting portion has a male screw portion provided on the outer peripheral surface of the concave end portion of the outer tube, and has a female screw portion screwed into the male screw portion on the inner peripheral surface. and, Ru and a hooking nut having a Kaketomeen to be hooked on the projecting end portion of the outer tube in the axial end
Send Haidorokan. The feed / drain mud pipe according to claim 1, further comprising a support roller provided on an outer periphery of the feed / drain mud pipe, abutting on an inner peripheral surface of the buried pipe and rolling in an axial direction. The feeding / discharging mud pipe according to claim 1 or 2 , wherein the double pipe is detachably coupled to the inner pipe and the outer pipe. It is an apparatus used for the muddy water propulsion method using the sending and discharging mud pipe according to any one of claims 1 to 3 ,
A supply and discharge mud pipe line comprising the supply and discharge mud pipes;
A pipe fixing portion that is arranged in the excavating machine, fixes a tip of the feed / drain mud pipe row, and receives the tensile force;
A muddy water propulsion method apparatus provided with a tensile force application unit that is installed behind the feed / drain mud pipe row and the buried pipe row and applies a tensile force to the rear end side of the feed / drain mud pipe row. In the muddy water propulsion method of driving the excavator and the buried pipe connected to the back of the excavator while excavating the ground with the excavator, supplying muddy water to the excavation site of the ground by the excavator, and discharging the excavated earth and sand together with the muddy water,
A step of passing a plurality of feed and discharge mud pipes that are connected to each other so as to be able to bend and feed the mud water, and passing the inside of the buried pipe and fixing the tip to the excavator ( a), and when retracting the excavator, applying a tensile force to the rear end side of the feed / drain mud tube row, and pulling back the excavator fixed to the feed / drain mud tube row (b) and Including
As the sending and discharging mud pipe, using the sending and discharging mud pipe according to any one of claims 1 to 3,
In the step (a), the feed / drain mud pipe row is supported so as to be movable in the axial direction with respect to the buried pipe,
Wherein step (b), a tensile force applied to the rear end of the feed waste sludge pipe string, it transmitted to the excavator not through the buried pipe
Mud water propulsion method.

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