JP3667673B2 - Pipe pedestal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an installation method for a pipeline pedestal, and more particularly, to a method for installing a pedestal used when a drilling machine, a tapping stand drilling machine, and the like are mounted on a pipeline, and for removal after work.
[0002]
[Prior art]
One of the operations using a pedestal on the pipe circumference is a drilling operation.
As an example of drilling a part of a pipeline, taking a gas pipe as an example, when repairing a partial section of a pipeline, holes for loading a blocking member such as an airbag are provided on both sides of the repair section. May form. In some cases, the perforated part is tapped and a branch member is provided.
Conventionally, holding a punching machine or a tapping machine manually for a drilling work or a tapping work increases the labor load, so that a pedestal is mounted on a pipeline as a holding means for these devices.
The pedestal is attached to the outer peripheral surface of the pipe by a chain or the like that circulates around the pipe, and a drilling machine or a tapping machine is mounted on the upper flat surface.
[0003]
[Problems to be solved by the invention]
When attaching a pedestal to the pipeline, as described above, it is necessary to provide a chain-hanging space for fixing the pedestal in the soil below the pipeline. Street.
FIG. 11 is a diagram for explaining this procedure. In FIG. 11A, first, in order to prevent damage to the pipe line and to speed up the work, the vicinity of the buried position is set in the pipe line. Machine excavation using an excavator or the like to the burial depth, and then excavate by switching the pipe burial position to manual digging, exposing the upper half circumference of the pipe to the outside (the dashed line in FIG. 11A) To form a space indicated by
Next, as shown in FIG. 11 (B), to provide a space (a space below the one-dot chain line in FIG. 11 (B)) for hanging the chain around the lower half circumference and the lower circumference of the pipeline. Drilling is performed. This excavation is done by hand. The main purpose of this is to prevent damage to the pipeline, and excavation below the lower circumference of the pipeline is carried out in a groping state, so workability is extremely poor. Moreover, since a space of a size that allows an operator to enter and work is required in the case of manual digging work, the excavation area becomes large, and the labor for excavation becomes enormous.
Further, when a pedestal is attached to the pipeline and the chain is also circulated around the pipeline, the pipeline is in a state of being floated within the excavated ridge. Further, when backfilling is performed, earth and sand at the time of backfilling is also put into the space portion below the lower peripheral surface of the pipe line, but the work is difficult to perform and the compaction tends to be insufficient. For this reason, there is a possibility that the pipe line may be damaged by receiving an impact load due to a wheel load by a vehicle passing through the road after construction. Therefore, conventionally, a measure has been taken to compensate for the lack of compaction by filling the space below the lower half peripheral surface of the pipe with a sandbag.
Originally, it is not preferable to dig this part, that is, the lower part of the lower half of the pipeline, because it increases the number of work steps such as taking measures for support. Necessary. For this reason, conventionally, a treatment is generally adopted in which fluidized soil or the like is poured into the space below the excavated pipe lower peripheral surface and hardened. However, when such a measure is taken, it is undeniable that the work time becomes long and the work cost becomes extremely high because the preparation step for the fluidization treatment method is required.
[0004]
On the other hand, some pipes to be worked have different outer diameters, and therefore, it is necessary to prepare a pedestal to be installed according to each outer diameter. However, arranging such pedestals raises the cost of managing parts.
[0005]
When the pedestal is installed in the pipe line, it is important to secure the airtightness between the outer peripheral surface of the pipe line and the contact surface of the pedestal in order to prevent a leakage accident from a perforated hole as a working part. Normally, an O-ring for sealing is used as a member that enhances airtightness. However, the O-ring is designed to increase the contact pressure by using a crushing margin when contracted and deformed by receiving a compressive force. If the crushing margin is increased in order to increase the airtightness, the crushing margin may reduce the adhesion between the pipe outer peripheral surface and the pedestal. For this reason, if it is going to improve airtightness, the adhesiveness of a pipe outer peripheral surface and a base will be impaired, and there exists a possibility that the pipe base may be maintained in the unstable mounting state by the part | minute by the fall of adsorption power. .
[0006]
An object of the present invention is to prevent an increase in work cost and parts management cost of the pedestal itself in view of the problems in the above-mentioned conventional pedestal for pipelines, and to prevent airtightness and adsorption force when installed on the outer peripheral surface of the pipeline. An object of the present invention is to provide a pedestal for pipelines having a configuration capable of achieving both of the above.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a pedestal for a pipe line that is attached when installing in a state in which a device used for operations such as drilling or tapping is held in a part of the metal pipe line, and the metal pipe A non-magnetic body and a magnetic body having an outer shell portion placed on an outer peripheral surface of a road construction site, and a bottom surface arranged in the outer shell portion and shaped like the outer peripheral surface of the metallic conduit And a base portion alternately arranged in the circumferential direction, and rotatably provided by the outer shell portion in a state of facing the base portion, and a plurality of magnetic poles and yoke portions are alternately arranged along the circumferential direction. The rotating magnet portion is arranged in a state where a plurality of permanent magnets and a yoke portion are alternately arranged along the circumferential direction, and the rotating magnet portion is interlocked with the rotating operation. Is displaced in the magnetic path from the magnetic pole. Includes the case including sexual conduit, the case where a magnetic force is short-circuited does not include the metal pipe in the magnetic path is selectable configuration from the pole, The yoke adjacent to the magnetic pole is made longer than the length of the magnetic pole so as to separate the ends of the magnetic poles from each other. It is characterized by that.
[0008]
According to a second aspect of the present invention, in addition to the first aspect of the present invention, the magnetic poles of the rotating magnet portion and the magnetic body on the base side facing the magnetic pole are perpendicular to the cross-sectional center of the metallic conduit. It is characterized by being arranged in numbers that can be positioned on both sides.
[0009]
The invention described in claim 3 A pipe pedestal to be installed when installing a device used for drilling or tapping on a part of a metallic conduit, and mounted on the outer peripheral surface of the metallic conduit. And a non-magnetic body and a magnetic body alternately arranged in the circumferential direction, and having a bottom surface that follows the outer circumferential surface of the metallic conduit and is disposed in the outer shell section. A rotating magnet portion provided with a plurality of magnetic poles and yoke portions alternately arranged along the circumferential direction, the base portion being configured to be rotatable by the outer shell portion in a state facing the base portion, The rotating magnet portion is alternately arranged in a state where a plurality of permanent magnets and yoke portions are adjacent to each other along the circumferential direction, and is displaced along the circumferential direction of the rotating magnet portion in conjunction with the rotation operation. By including a metallic conduit in the magnetic path from the magnetic pole, The magnetic path from the magnetic pole is short-circuited and the metal pipe is not included in the magnetic path, and the yoke adjacent to the magnetic pole is made longer than the length of the magnetic pole. The outer shell portion has an O-ring housing groove that opens toward the outer peripheral surface of the metallic conduit at a position corresponding to the peripheral portion of the construction location of the metallic conduit. The O-ring receiving groove is formed to have a size capable of absorbing the collapse of the O-ring, and the adhesion force of the O-ring is determined from the hardness set in advance in the O-ring and the size capable of absorbing the collapse. Has been enhanced It is characterized by that.
[0010]
The invention according to claim 4 is the invention according to claim 1. Or 3 In the pipeline pedestal described, The base is provided with a fixed holding member capable of moving forward and backward in the radial direction of the metallic conduit, and the fixed holding member advances and retracts corresponding to the outer diameter of the metallic conduit. To hold the road in multiple places It is a feature.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a procedure when installing a pipeline pedestal according to an embodiment of the present invention. FIG. 1A shows a metallic pipeline P such as cast iron embedded in the ground. Indicates the state.
In order to expose the perforated / tapped portion with respect to the metallic pipe P, first, as shown in FIG. 1B, excavation is performed until the upper peripheral surface of the metallic pipe P is exposed. In this case, as in the case described with reference to FIG. 11, machine digging using an excavator or the like is carried out to a depth near the buried position of the pipeline, and then the pipeline buried position is switched to manual digging. Excavation is performed while adjusting the digging depth so that the pedestal 1 can be mounted on the upper peripheral surface of the metallic conduit P.
The excavation is completed when the outer peripheral surface of the metallic pipe P corresponding to the installation area necessary for mounting the pipe pedestal 1 is exposed, and the excavation after that, that is, the metallic pipe that has been conventionally performed. The excavation down to the lower peripheral surface of the road P is not performed. For this reason, the excavation range at the periphery of the metal pipe P is the excavation range necessary for exposing the upper peripheral surface of the metal pipe P, and the lower part of the lower surface of the metal pipe P is excavated. The excavation range can be made extremely small without providing a space that is necessary for the operator to enter.
[0013]
FIG. 1 (C) shows a state in which the pipe base 1 is mounted on the upper peripheral surface of the metal pipe P exposed to the outside. In this state, the pipe base 1 is the metal pipe. After being mounted on the upper peripheral surface of the path P, the pipe base 1 is magnetically attracted.
The pipe pedestal 1 attached to the metallic pipe P includes a plurality of permanent magnets instead of electromagnets, and the magnetic path between the magnetic poles of the magnet includes the metallic pipe P and magnetically shorts between the magnetic poles. By switching to a state in which the magnetic pipe P is not included in the magnetic path between the magnetic poles, the metallic pipe P can be attached and detached. The fact that the metallic pipe P is not included in the magnetic path between the magnetic poles means that no magnetic force is exerted on the metallic pipe P.
[0014]
FIG. 1 (D) shows a state in which the pipe pedestal 1 is magnetically attracted to the metallic pipe P. In this state, the pipe pedestal 1 is moved into the drilling machine, the tap stand or the pipe. A construction machine such as a bag insertion device is attached. In FIG. 1 (D), for convenience, a state is shown in which a bag insertion device S having two insertion pipes S1 intersecting with each other is mounted.
[0015]
The configuration of the pipe pedestal 1 mounted on the metallic pipe P is shown in the drawings shown in FIG. 2 and subsequent figures, and the configuration will be described below.
2 is a partial cross-sectional view in plan view of the pipe pedestal 1, and FIG. 3 is a cross-sectional view in a direction indicated by a broken line (3) in FIG.
2 and 3, the pipe base 1 includes a base outer shell 1A made of a nonmagnetic material.
The pedestal outer shell 1A has a bottom shape that can be placed on the outer peripheral surface of the metallic conduit P, and the metallic conduit is located at a position centered on an extension line from the cross-sectional center of the metallic conduit P. A work hole 1A1 for performing construction such as drilling work for P is formed.
[0016]
The pedestal outer shell portion 1A is provided with a space portion 8 between the outer peripheral surface thereof and the work hole 1A1, the inside of the space portion 8 is a base portion 2 on the metallic conduit P side, and this upper portion. The rotary magnet unit 3 is loaded in each.
The base 2 is a disk-like member embedded and fixed in the pedestal outer shell 1A. As will be described later, the base 2 includes a magnetic body 2A and a non-magnetic body 2B as main parts, as shown in FIG. The bottom surface is shaped to follow the outer peripheral surface of the metallic pipe P.
As shown in FIG. 3, the rotating magnet portion 3 includes a frame portion 3A made of a nonmagnetic material that can be fitted to the pedestal outer shell portion 1A and can rotate, and a part of the upper surface thereof is a pedestal outer shell portion 1A. Although the details will be described later in a downward opening formed at a position facing the base 2 and forming a mounting surface for construction equipment on the metallic conduit P, which is formed flush with a part of 2 and the magnetic pole 3B and the yoke 3C shown in FIG. 6 are loaded.
[0017]
As shown in FIGS. 2 and 4, the rotating magnet unit 3 includes a locking piece 4 protruding in the radial direction at a part of the outer peripheral surface, and this locking piece 4 swings a drive arm 5 described later. It can be turned by driving.
As shown in FIG. 4, the drive arm 5 is a swing arm whose base end is rotatably supported by the pedestal outer shell 1 </ b> A, and a pin 5 </ b> A provided at the swing end is attached to the locking piece 4. It is made to fit in the formed slit 4A.
2 and 4, the drive arm 5 causes the locking piece 4 to swing through the pin 5A at the swing end by rotating the bolt head 5B integrated at the base end with a wrench (not shown). The rotating magnet unit 3 can be rotated with the center of the plan view shape of the base 2 as a reference.
The amount of rocking of the locking piece 4, in other words, the amount of rotation of the rotating magnet portion 3 is such that the locking surfaces 4B and 4C formed at both ends in the circumferential direction of the locking piece 4 are formed on the pedestal outer shell portion 1A1. It is prescribed | regulated by being stopped by the engaging surface 1A2, 1A3 (refer FIG. 2) which exists. When the drive arm 5 is used, the torque necessary to rotate the rotating magnet unit 3 is obtained by the length of the wrench, but depending on the length, a large operating force may be required. . Therefore, as a countermeasure against such a case, it is possible to adopt a configuration in which the drive arm 5 is rotationally driven using a reduction gear (not shown).
[0018]
The base 2 and the rotating magnet unit 3 have the principle configuration shown in FIGS. 5 and 6. In FIG. 5, a plurality of magnetic body portions 2 </ b> A and non-magnetic body portions 2 </ b> B are alternately arranged on the base portion 2 along the circumferential direction. As shown in FIG. 2, the magnetic body portion 2 </ b> A in the base portion 2 has a circular cross section, but in FIG. 5, for the sake of convenience, the shape is shown in a shape extending in the radial direction in order to explain the operation principle. is there.
[0019]
As shown in FIGS. 3 and 6, the rotating magnet unit 3 is a disk-shaped member that can rotate on the basis of the same center as the shape of the base 2 in plan view, and a plurality of rotating magnets 3 have the same phase as the nonmagnetic material 2B in the base 2. The magnetic poles 3B and the yokes 3C are alternately arranged.
As shown in FIG. 7B, the magnetic pole 3B is magnetized so that one end is an N pole and the end opposite to this end is an S pole.
As shown in FIG. 7 (A), the rotating magnet portion 3 is configured so that the magnetic pole 3B is opposed to the magnetic body portion 2A and the nonmagnetic body portion 2B that the base portion 2 has. Magnetic field line of the base 2 passes through the magnetic body part 2A of the base part 2 and returns to the S pole of the magnetic pole 3B via the inside of the metallic pipe line P, and between the magnetic poles 3B. When the non-magnetic body 2B of the base 2 is positioned on the magnetic field 2B, the magnetic field lines from the magnetic pole 3B can be selected to short-circuit through the magnetic body 2A.
At the time of short-circuiting of the magnetic field lines mentioned in the latter, since the magnetic field lines do not reach the metallic pipe P, the magnetic path of the magnetic pole 3B does not include the metallic pipe P. As a result, as shown in FIG. 7A, when the metallic conduit P is included in the magnetic path of the magnetic pole 3B, the conduit pedestal 1 is magnetically attracted to the metallic conduit P side. However, when the metallic conduit P is not included in the magnetic path of the magnetic pole 3B, the conduit pedestal 1 can be removed from the metallic conduit P.
In the present embodiment, the magnetic pole 3B and the magnetic body 2A are provided at a plurality of locations. For example, depending on the size of the magnetic pole 3B and the magnetic body 2A, the magnetic flux can be obtained even when the thin metal pipe P is targeted. Leakage can be reduced and adhesion can be increased. In particular, when a thin metal pipe P is targeted, the magnetic force from each magnetic pole 3B leaks from the peripheral wall of the metal pipe P by juxtaposing a plurality of small-sized magnetic poles 3B and magnetic bodies 2A. It is possible to secure a comprehensive adsorption force by reducing the amount of
In the present embodiment, when the magnetic path configuration described above is selected, the locking piece 4 and the drive arm 5 shown in FIGS. 2 and 4 are used, and the magnetic pole 3B and the yoke are arranged along the circumferential direction of the rotating magnet unit 3. 3C is displaced.
[0020]
In the present embodiment, a configuration is adopted in which the magnetic attractive force of the duct base 1 is increased by strengthening the magnetic force from the magnetic pole 3B. Hereinafter, this configuration will be described with reference to FIG. FIG. 8 is a diagram showing an arrangement configuration of the magnetic pole 3B and the adjacent yoke 3C. In FIG. 8, the adjacent yoke 3C across the magnetic pole 3B is made longer than the length of the magnetic pole 3B, in other words. The magnetic pole 3B is thinner than the yoke 3C. As a result, the magnetic pole 3B looks like the end portions of the adjacent ones are separated from each other, so that the decrease in magnetic flux density due to the demagnetizing field action can be suppressed, and the magnetic attractive force is increased.
[0021]
Further, in the present embodiment, a configuration is adopted in which the suction force of the pipe base 1 is not lowered even when some tolerance is generated in the outer diameter of the metallic pipe P to be mounted. Hereinafter, this configuration will be described. In FIG. 9, the magnetic body 2 </ b> A in the base portion 2 is described as an example, but it is prefaced that the magnetic pole 3 </ b> B in the rotating magnet portion 3 has the same configuration.
FIG. 9 is a schematic diagram for explaining the facing relationship between the magnetic body portion 2A and the metallic conduit P in the base portion 2, and FIG. 9A shows a configuration according to the present embodiment.
9A, the number of magnetic bodies 2A that can be positioned on both sides of a vertical line (a line indicated by reference sign CL in FIG. 9) passing through the cross-sectional center of the metallic pipe P is provided. Thereby, even if some tolerance is generated in the outer diameter of the metallic pipe P, a magnetic force can be exerted on the metallic pipe P in a wide range from both sides across the vertical line CL. By adopting such a configuration, as shown in FIG. 9B, the range covered by the magnetic force can be expanded as compared with the case where the magnetic body 2 is positioned on the vertical line CL.
In addition to obtaining such a function, the following problems can be solved as shown in FIG. 9B. That is, in the arrangement configuration of the magnetic body 2A shown in FIG. 9B, the magnetic body 2A adjacent to the magnetic body 2A on the vertical line CL is separated from the magnetic body on the vertical line CL by the tolerance of the metallic conduit P. There is a case where a gap is formed farther from the outer peripheral surface of the metallic pipe P than 2A. For this reason, the magnetic force between the magnetic body 2A on the vertical line CL and the magnetic body 2A adjacent to the magnetic body 2A decreases in proportion to the size of the gap interval generated between the metallic pipe P, The adsorption force between the pipe pedestal 1 and the metallic pipe P is reduced. On the other hand, in the arrangement configuration of the magnetic body 2A shown in FIG. 9A, the gap distance between the adjacent magnetic bodies 2A and the metallic conduit P is not different, so that the attractive force is reduced. Can be minimized.
[0022]
In the present embodiment, there is provided a configuration for dealing with a metallic conduit P in which the outer diameter of the metallic conduit P to which the conduit pedestal 1 is mounted has a tolerance or a slightly different outer diameter. Hereinafter, this configuration will be described with reference to FIG.
FIG. 10 is a cross-sectional view corresponding to FIG. 3, in which a pedestal outer shell portion 1 </ b> A is provided with a fixed holding member 6 that can advance and retreat in the radial direction of the metallic pipe line P.
In FIG. 10, the fixed holding members 6 are respectively provided at relative positions across a vertical line passing through the cross-sectional center of the metallic pipe P.
In FIG. 10, the fixed holding member 6 is inserted into the driving cylinder 6A and the driving cylinder 6A that is rotatably supported in a state in which the fixing holding member 6 is prevented from being detached from the pedestal outer shell 1A. And a sliding piece 6C attached to the end of the sliding shaft 6B on the metal pipe P side.
A rotating operation handle 6D is integrated with the driving cylinder 6A. The rotating cylinder 6A is rotated by rotating the rotating operation handle 6D, and the sliding shaft 6B screwed to the rotating cylinder 6A is connected to the metallic pipe line. It is made to advance and retract toward the outer peripheral surface of P.
[0023]
In the fixed holding member 6, the holding piece 6 </ b> C attached to the end of the sliding shaft 6 </ b> B can be brought into pressure contact with the outer peripheral surface of the metallic conduit P in conjunction with the forward / backward movement of the sliding shaft 6 </ b> B (FIG. 10). In FIG. Thereby, the metallic pipe P is pressed and clamped at a relative position across the center of the cross section, and the pipe base 1 is prevented from shifting in the circumferential direction of the metallic pipe P by the reaction force at this time, The center of the cross section of the metallic pipe P can be aligned.
The fixing and holding member 6 is also used for the metallic pipe P having an outer diameter slightly smaller than the maximum outer diameter among the outer diameters of the metallic pipe P on which the pipe base 1 can be installed. Since the metallic conduit P can be pressed and clamped when the amount of advancement is allowed, not only the metallic conduit P having the maximum outer diameter but also the metallic conduits P having a plurality of types of outer diameters can be used. Can be diverted. In particular, even in the case of a metallic pipe P having a small diameter, uniform contact can be achieved in the circumferential direction of the metallic pipe P, so that part of the pipe pedestal 1 does not float from the outer peripheral surface of the pipe. . As a result, the opposing relationship between the magnetic body 2A shown in FIG. 9A and the magnetic pole 3B (not shown) and the outer peripheral surface of the metallic conduit P is equalized, which is shown in FIG. 9A. A part of the outer peripheral surface of the metallic pipe P is not lifted with the vertical line CL as a boundary, and a decrease in the magnetic force between the magnetic body 2A and the magnetic pole 3B is suppressed to reduce the adhesion. Can be prevented.
[0024]
In the present embodiment, apart from the above-described configuration, a configuration for improving the adhesion between the pipeline base 1 and the metallic pipeline P is provided. Hereinafter, this configuration will be described with reference to FIG.
In FIG. 10, an O-ring 7 for sealing the periphery of the work hole 1A1 is provided on the bottom surface of the pedestal outer shell 1A.
The O-ring 7 is made of an elastically deformable material such as NBR having a hardness set to less than 50 degrees, and has an outer diameter dimension of a metal having the smallest diameter among the metal pipes P that can be installed in advance. When the sex duct P is a target, the outer dimension is set so that a protruding amount capable of being pressed against the outer peripheral surface is obtained.
On the other hand, the accommodation groove that accommodates the O-ring 7 uses an accommodation groove 1A2 formed around the working hole 1A1 in the pedestal outer shell portion 1A. A space volume is provided along the circumferential direction to absorb the collapse caused by the contraction deformation of the O-ring 7. As a result, when the pipe pedestal 1 is installed for the metal pipe P with the smallest diameter, the O-ring 7 remains in its original shape and presses against the outer peripheral surface of the metal pipe P, and the maximum diameter When the pipe pedestal 1 is installed for the metallic pipe P, the O-ring 7 is crushed and expanded in the circumferential direction of the pipe P unlike the case of the metallic pipe P having a diameter smaller than this diameter. Even in this case, the expanded portion enters the housing groove 1A2, and can be brought into pressure contact with the outer peripheral surface of the metallic conduit P with an appropriate pressure.
[0025]
In the above configuration, by setting in advance the size capable of absorbing the crushing in the accommodation groove 1A2, that is, the size of the crushing allowance and the hardness of the O-ring 7, the tube according to the hardness of the O-ring 7 can be obtained even when the crushing is absorbed. Airtightness due to elastic repulsion can be secured while the facing surfaces of the road pedestal 1 and the metallic conduit P are in close contact with each other, and thereby, the airtightness and the adsorption due to the close contact are in conflict. It is possible to balance power.
[0026]
【The invention's effect】
According to the first aspect of the present invention, the plurality of permanent magnets and the yoke portions are alternately arranged along the circumferential direction, and are rotated along the circumferential direction of the rotating magnet portion in conjunction with the rotational operation. By rotating, a rotating magnet unit that can be selected between a case where a metallic conduit is included in the magnetic path from the magnetic pole and a case where the magnetic force from the magnetic pole is short-circuited and the metallic conduit is not included in the magnetic path. It is possible to mount and remove the metallic conduit from the state in a state where it is placed from the upper peripheral surface side. In particular, in the case where the metallic path is included in the magnetic path from the magnetic pole, the length in the direction in which the yoke adjacent to the magnetic pole is adjacent to the magnetic pole is increased with respect to the gap between the ends of the magnetic poles. By being separated, it is possible to suppress a decrease in magnetic flux density due to the demagnetizing field action, thereby making it possible to force the magnetic field lines directed in the demagnetizing field direction to the direction including the metal pipe and to perform strong adsorption. This eliminates the need for conventional excavation for the lower part of the lower peripheral surface of the metal pipe, so the number of man-hours for excavation work and the amount of man-hours required for waste soil treatment and backfill work that occurs during excavation, The working time can be extremely reduced.
[0027]
According to the second aspect of the present invention, the magnetic poles included in the rotating magnet portion and the magnetic body included in the base portion opposite thereto are provided in a number that is positioned on both sides of a vertical line passing through the center of the cross section of the metallic conduit. Therefore, the magnetic adsorption range with respect to the metallic conduit can be expanded, and the adhesion of the conduit pedestal to the metallic conduit can be enhanced.
[0028]
Claim 3 According to the described invention, by setting the size capable of absorbing the crushing in the O-ring housing groove provided in the outer shell portion and the hardness of the O-ring, the hardness of the O-ring even when the crushing is absorbed To ensure airtightness due to reaction force when the O-ring is crushed by optimizing the amount of crush absorption while keeping the opposed surfaces of the pipe pedestal and the metal pipe in close contact with each other This makes it possible to achieve both airtightness and adsorption power.
[0029]
Claim 4 According to the described invention, the pipe base can be installed by providing the fixed holding member capable of holding the metal pipe at a plurality of locations by moving forward and backward in accordance with the outer diameter of the metal pipe. Even if there is a slight difference in the outer diameter of the metallic conduit, the metallic conduit is clamped by the conduit pedestal to enable alignment between the conduit pedestal and the metallic conduit where it is installed. At the same time, it is possible to increase the adhesion so that the suction force of the duct base is not lowered. As a result, it is possible to reduce the management cost of parts by eliminating the need to prepare a pipe pedestal according to the difference in the outer diameter of the metallic pipe, and the pipe pedestal and the metallic pipe can be reduced. A phenomenon that is likely to occur when the center position is not aligned is to prevent a part of the pipe pedestal from floating from the outer peripheral surface of the metallic pipe. The opposing surfaces are brought into close contact with each other, so that a decrease in adsorption force is eliminated, and instability during work can be eliminated.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a procedure of an installation method using a pipeline base according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view in plan view of the conduit base shown in FIG.
FIG. 3 is a cross-sectional view taken in the direction indicated by the broken line (3) in FIG.
4 is a perspective view showing a rotating magnet portion and a rotational driving structure of the rotating pedestal in the duct base shown in FIG. 2;
5 is a perspective view for explaining the principle configuration of a base portion used in the conduit base shown in FIG. 2. FIG.
6 is a perspective view for explaining the principle configuration of a rotating magnet unit used in the duct base shown in FIG. 2. FIG.
7A is a diagram illustrating an example of a magnetic path formation state, and FIG. 7B is a perspective view of a magnetic pole used for magnetic path formation. is there.
8 is a view for explaining the configuration of magnetic poles and yokes used in the rotating magnet section shown in FIG. 6;
FIGS. 9A and 9B are diagrams illustrating a configuration in which the magnetic body portion and the metallic conduit in the base portion illustrated in FIG. 2 are opposed to each other. FIG. 9A illustrates the case according to the present embodiment, and FIG. 9B illustrates the embodiment. Different cases are shown.
10 is a cross-sectional view corresponding to FIG. 3 for explaining a close contact structure of the pipe base shown in FIG. 2 with respect to the metallic pipe.
FIG. 11 is a diagram for explaining the installation state of a conventional duct base.
[Explanation of symbols]
1 Pipe pedestal
1A Pedestal shell
1A1 Work hole
2 base
2A magnetic material
2B non-magnetic material
3 Rotating magnet
3B magnetic pole
3C York
6 Fixed holding member
P Metal conduit

Claims (4)

A pipe pedestal to be attached when installing in a state in which a device used for work such as drilling or tapping is held in a part of a metal pipe,
An outer shell portion placed on the outer peripheral surface of the construction location of the metallic conduit;
A base portion disposed in the outer shell portion and having a bottom surface that follows the outer peripheral surface of the metallic conduit, and a plurality of nonmagnetic bodies and magnetic bodies are alternately arranged in the circumferential direction;
A rotating magnet portion that is rotatably provided by the outer shell portion in a state of facing the base portion, and in which a plurality of magnetic poles and yoke portions are alternately arranged along the circumferential direction;
The rotating magnet portion is alternately arranged in a state where a plurality of permanent magnets and yoke portions are adjacent to each other along the circumferential direction, and is displaced along the circumferential direction of the rotating magnet portion in conjunction with the rotation operation. Accordingly, the magnetic path from the magnetic pole includes a metallic conduit, and the magnetic path from the magnetic pole is short-circuited so that the metallic conduit is not included in the magnetic path. ,
A duct base , wherein the yoke adjacent to the magnetic pole is made longer than the length of the magnetic pole so as to separate the ends of the magnetic poles from each other . In the pipeline base according to claim 1,
The pipes characterized in that the magnetic poles of the rotating magnet part and the magnetic material on the base side facing the magnetic poles are arranged in a number that can be positioned on both sides of a vertical line passing through the center of the cross section of the metallic pipe. Pedestal. A pipe pedestal to be attached when installing in a state in which a device used for work such as drilling or tapping is held in a part of a metal pipe,
An outer shell portion placed on the outer peripheral surface of the construction location of the metallic conduit;
A base portion disposed in the outer shell portion and having a bottom surface that follows the outer peripheral surface of the metallic conduit, and a plurality of nonmagnetic bodies and magnetic bodies are alternately arranged in the circumferential direction;
A rotating magnet portion that is rotatably provided by the outer shell portion in a state of facing the base portion, and in which a plurality of magnetic poles and yoke portions are alternately arranged along the circumferential direction;
The rotating magnet portion is alternately arranged in a state where a plurality of permanent magnets and yoke portions are adjacent to each other along the circumferential direction, and is displaced along the circumferential direction of the rotating magnet portion in conjunction with the rotation operation. Accordingly, the magnetic path from the magnetic pole includes a metallic conduit, and the magnetic path from the magnetic pole is short-circuited so that the metallic conduit is not included in the magnetic path. ,
The yoke adjacent to the magnetic pole is made longer than the length of the magnetic pole and has a structure that separates the ends of the magnetic poles,
In the outer shell portion, an O-ring receiving groove that opens toward the outer peripheral surface of the metallic conduit is formed at a position corresponding to a peripheral portion of the construction place of the metallic conduit, It has a size capable of absorbing the collapse of the O-ring, and is provided with the adhesion strength of the O-ring being increased from the preset hardness of the O-ring and the size capable of absorbing the above-mentioned collapse. A pedestal for pipelines. In the pipeline base according to claim 1 or 3 ,
The base is provided with a fixed holding member capable of moving forward and backward in the radial direction of the metallic conduit,
The pedestal for a conduit , wherein the fixing and holding member moves forward and backward in accordance with the outer diameter of the metallic conduit so as to hold the metallic conduit at a plurality of locations .

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