JP3497141B2 - Pipe pedestal installation method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a pedestal for a pipeline, and more particularly, to a pedestal used when mounting a punching machine, a tap stand punching machine or the like on a pipeline and removing it after work. Regarding the construction method for.

[0002]

2. Description of the Related Art Perforation work is one of the works using a pedestal on the peripheral surface of a pipeline. Taking a gas pipe as an example of drilling a part of the pipeline, when repairing a partial section of the pipeline, holes for loading a blocking member such as an airbag are provided on both sides of the repair section. May be formed. In some cases, tapping is performed on the perforated portion to provide a branch member. Conventionally, manually holding a punching machine or a tapping machine for punching work or tapping work requires a large amount of labor, so that a pedestal is attached to a pipeline as a holding means for those devices. The pedestal is attached to the outer peripheral surface of the pipeline by a chain that is wound around the pipeline, and a piercing machine and a tap stand are mounted on the upper flat surface.

[0003]

As described above, when the pedestal is attached to the pipeline, it is necessary to provide a space around which the chain for fixing the pedestal is provided in the soil below the pipeline. However, the procedure is as follows. FIG. 7 is a diagram for explaining this procedure.
In (A), first, for the purpose of preventing damage to the pipeline and speeding up the work, mechanical excavation using an excavator or the like is performed near the burial position to the burial depth of the pipeline, and then The burial position is switched to manual digging for excavation, and the upper half of the pipeline is exposed to the outside (a space indicated by a chain line in FIG. 7A is formed). Next, as shown in FIG. 7 (B), in order to provide a space for hanging the chain around the lower half of the pipe and below the lower peripheral surface (a space below the one-dot chain line in FIG. 7 (B)). Is excavated. This excavation is done by hand. The main purpose of this is to prevent damage to the pipeline, and the excavation below the lower peripheral surface of the pipeline is carried out in a groping state, so the workability is extremely poor. In addition, since a space large enough for a worker to enter and work is required during the manual excavation work, the excavation area becomes large and the excavation work becomes very troublesome. Further, when the pedestal is attached to the pipeline and the chain is also rotated around the pipeline, the pipeline is in a floating state in the excavated shaft. Further, when the backfilling is performed, the earth and sand for the backfilling are also put in the space below the lower peripheral surface of the pipeline, but the work is difficult to perform and the compaction tends to be insufficient. For this reason, the pipeline may be damaged by the impact load due to the wheel load caused by the vehicle passing through the road after the construction. Therefore, conventionally, a treatment has been adopted in which a space bag below the lower half peripheral surface of the duct is filled with sandbags or the like to make up for insufficient compaction. Originally, it is not preferable to excavate this part, that is, the lower half of the lower part of the pipeline because it increases the number of work steps such as taking measures for supporting, but
It is absolutely necessary to hang the chain around. For this reason, conventionally, a method of pouring fluidized soil or the like into the space below the excavated lower surface of the pipeline to solidify it has been generally adopted. However, when such a measure is taken, it cannot be denied that the work time becomes long and the work cost becomes extremely high because the preparation process for the fluidization treatment method is required.

An object of the present invention is to provide a pedestal installation method capable of reducing the number of facilities and working steps in view of the problems in the conventional pedestal installation method.

[0005]

The invention according to claim 1 is
A method of installing a pedestal to be installed when a device used for work such as drilling or tapping is held in a part of a metal pipeline, which is intended for the embedded position of the metal pipeline. Excavate so that only the work position of the metal pipeline is exposed to the outside, and attach the pedestal with a structure capable of magnetic attraction to the work position of the metal pipeline peripheral surface exposed to the outside, It is characterized in that the metal pipe is brought into a magnetically attracted state so that the pedestal is fitted with the working machine such as the punching or tapping to start the work.

The invention as set forth in claim 2 is characterized in that the excavation range in the peripheral portion of the pipeline is targeted only at a portion corresponding to the upper half of the metal pipeline.

According to a third aspect of the present invention, the pedestal is provided with a plurality of permanent magnets facing the outer peripheral surface of the metal conduit, and the permanent magnets have a magnetic path between the magnets which is the metal conduit. And the case where the magnets are magnetically short-circuited and the magnetic path between the magnets does not include the metal pipe path.

[0008]

According to the first and second aspects of the invention, the excavation range at the time of installing the pedestal is targeted only at the work position of the pipeline, and particularly in the invention of the second aspect, the upper half circumferential surface of the metal pipeline is The pedestal can be installed simply by exposing it to the outside. As a result, it is possible to prevent the conventional excavation from below the lower peripheral surface of the metal pipe.

According to the third aspect of the present invention, the permanent magnet provided on the pedestal itself constitutes a magnetic path including the duct and the magnets are magnetically short-circuited to each other so that the magnetic force does not reach the duct. The state can be selected to magnetically attract the pedestal to the conduit. Therefore, unlike the case where the electromagnet is used, the pedestal can be stably fixed without requiring power supply equipment, explosion-proof equipment, or the like.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a procedure of an installation method which is an embodiment of the present invention, and FIG. 1 (A) shows a state in which a metal pipe P made of cast iron or the like is buried in the ground. In order to expose the location where the metal pipe P is bored and tapped, first, as shown in FIG. 1B, excavation is performed until the upper peripheral surface of the metal pipe P is exposed. In this case,
As in the case described with reference to FIG. 7, mechanical excavation using an excavator or the like is performed up to the burial depth of the pipeline up to the burial position, and then the pipeline burial position is switched to manual digging and the base 1 is made of metal. The excavation is performed while adjusting the depth of the hand digging so that it can be attached to the upper peripheral surface of the pipe P. The excavation is completed when the outer peripheral surface of the metal pipe P corresponding to the installation area required to mount the pedestal 1 is exposed, and the subsequent excavation, that is,
The conventional excavation down to the lower surface of the metal pipe P is not performed. Therefore, the excavation range in the peripheral portion of the metal pipeline P is only the excavation range required for exposing the upper peripheral surface of the metal pipeline P, and the lower peripheral surface of the metal pipeline P is excavated. The excavation area can be made extremely small without providing a space for an operator to enter at that time.

FIG. 1C shows a state in which the pedestal 1 is mounted on the upper peripheral surface of the metal pipe P exposed to the outside,
In this state, the pedestal 1 is mounted on the upper peripheral surface of the metal pipe P, and then the pedestal 1 is magnetically attracted. The pedestal 1 mounted on the metal conduit P includes a plurality of permanent magnets instead of electromagnets, and the magnetic path between the magnets is such that the magnetic path includes the metal conduit P and the magnets are magnetically short-circuited. The magnetic path between the magnets can be attached to and detached from the metal pipe P by switching to a state in which the metal pipe P is not included.
The fact that the magnetic path between the magnets does not include the metal conduit P means that the magnetic force does not reach the metal conduit P.

FIG. 1D shows a state in which the pedestal 1 is magnetically attracted to the metal pipe P. In this state, the pedestal 1 is
For this, a construction machine such as a punching machine, a tap stand, or a bag inserting device into the pipe is installed. Note that FIG. 1 (D)
Then, for the sake of convenience, a state in which the bag insertion device S including the insertion pipes S1 of two systems is crossed is shown.

The pedestal 1 mounted on the metal pipe P is shown in FIG.
The configuration is shown in the following figures, and the configuration will be described below. In FIG. 2, the pedestal 1 is provided with a base portion 2 placed on the outer peripheral surface of the construction site in the metal pipe P, and the base portion 2 is a bottom surface following the outer peripheral surface shape of the metal pipe P, so-called mounting. A placement surface is formed, and the top surface is a mounting surface for construction equipment such as a punching machine and a tap stand (not shown). Further, a work hole 2A for performing a drilling work or the like is formed on an extension line from the center of the cross section of the metal pipe P in the base portion 2. In FIG. 1, reference numeral 10 indicates an O-ring for sealing the working hole 2A.

A rotation operating portion 3 made of a non-magnetic material is inserted into the inside of the base portion 2. The rotation operating portion 3 is formed of a ring-shaped member, and inner peripheral teeth 3A are formed on the inner peripheral surface. Has been done. The rotation operation part 3 includes an operation handle 4 which is inserted into a circumferential elongated hole 2B formed in the base part 2,
It can be rotated at a predetermined angle within the elongated hole 2B. In the present embodiment, the predetermined angle is set to an angle that allows a rotating magnet body described later to rotate by approximately 180 degrees.

As shown in FIGS. 2 and 3, a plurality of rotary operating parts 3 are arranged along the parallel direction of the inner peripheral teeth 3A and are rotatable in association with the movement of the inner peripheral teeth 3A. Rotating magnet body 5, a plurality of yokes 6 arranged adjacent to the rotating magnet body 5, and the rotating magnet body 5 in the circumferential direction with the yoke 6 interposed therebetween.
And a fixed magnet body 7 facing each other.
The rotating magnet body 5 is rotatably provided by a support shaft 8 having one end in the axial direction supported by the base 2 and the other end in the axial direction supported by a cover member 1A made of a non-magnetic material covering the upper surface of the base 2. As shown in FIG. 4, the circular magnets are arranged at opposite positions with the center of rotation in between, that is, 18
The north and south poles are magnetized with a phase of 0 degree. The support shaft 8 of the rotating magnet body 5 is integrally provided with a gear 9 (in FIG. 3, 5 which is a reference numeral of the rotating magnet body is shown in parentheses) that meshes with the inner peripheral teeth 3A of the rotating operation portion 3. The gear 9 is capable of reversing the phase of the magnetic poles of the rotary magnet body 5 by 180 degrees by rotating in association with the movement of the inner peripheral teeth 3A due to the rotation of the rotation operating portion 3. .

As shown by the alternate long and short dash line in FIG. 1, the yoke 6 has its upper end at a position adjacent to the rotary magnet body 5 in the base portion 2, and its lower end is arranged close to the outer peripheral surface of the metal pipe P. . Thereby, a magnetic path can be configured when the magnetic lines of force are emitted toward the metal pipe P, and when the magnetic lines of force are emitted toward the metal pipe P, the metal pipe P is formed. It becomes the part which adsorbs.

The fixed magnet body 7 is composed of a circular magnet which is magnetized similarly to the rotating magnet body 5, but as shown in FIGS. 2 and 3, unlike the rotating magnet body 5, such as a gear. It does not have a rotation transmission part and is not designed to rotate. Therefore, by changing the phase of the magnetic poles of the rotating magnet body 5, it is possible to set a case where the same poles face each other and a case where the different poles face each other.

FIG. 5 is a schematic diagram for explaining a state of generation of magnetic force lines due to the facing relationship between the rotating magnet body 5 and the fixed magnet body 7. FIG. 5A is a diagram showing the rotating magnet body 5 and the fixed magnet body 7. 5B shows a state in which the magnetic poles of the magnetic poles and the opposite poles face each other, and FIG. 5B shows a state in which the magnetic poles of the rotating magnet body 5 and the fixed magnet body 7 face the different poles. In FIG. 5A, when the magnetic poles of the rotating magnet body 5 are rotated so as to have the same poles as the magnetic poles of the fixed magnet body 7, the magnetic force lines repel each other so that the magnetic force lines pass through the yoke 6. It is discharged toward the metal pipe P (in FIG. 5A, the generation state of magnetic force lines indicated by the alternate long and short dash line). Therefore, the magnetic force of the magnet having the yoke added to the magnetic pole acts on the metal pipe P.
As a result, the pedestal 1 can be magnetically attracted to the metal pipe P.

In FIG. 5B, when the magnetic poles of the rotating magnet body 5 rotate so as to have different poles from the magnetic poles of the fixed magnet body 7, the magnetic paths are formed by the magnetic poles facing each other in the yoke 6. , There is no emission of magnetic field lines to the metal pipe P (Fig. 5
(B) The generation state of the magnetic field lines shown by the one-dot chain line in (b). It cannot be said that the magnetic field lines are not completely emitted because there is a leakage magnetic force, but since the leakage magnetic force itself is small, it can be considered that there is almost no emission. For this reason, the magnetic force from the magnetic poles hardly acts on the metal conduit P, so that the pedestal 1 can be easily removed from the metal conduit P or moved after being mounted. The rotation amount of the rotary operation part 3 with respect to the rotation amount of the rotary magnet body 5 is set in consideration of the difference in the number of teeth between the inner peripheral teeth 3A and the gear 9.

In the above structure, the fixed magnet bodies 5 and 7 are
It is possible to set the magnetic attraction state of the pedestal 1 to the metal pipe P by rotating itself to change the magnetic path formation state with the adjacent magnet, but in the present invention, magnetic poles are formed in the circumferential direction of the pedestal 1. The yokes are arranged alternately, and the magnetic path from the magnetic poles reaches the metal conduit P through the yokes to include the metal conduit P and the metal conduits P by reaching the magnetic poles in the yoke.
It is also possible to switch to a state not including.

In such a configuration, since a permanent magnet is used for magnetic attraction instead of an electromagnet, it is possible to eliminate the possibility that the pedestal 1 may fall off or generate heat during a power failure, which is a problem caused by passing an electric current. Therefore, it is possible to simplify the equipment required for installing the pedestal 1 by eliminating the need for power supply equipment and explosion-proof measures. Some construction machines mounted on the pedestal 1 have a structure in which an external force that causes the base portion 2 of the pedestal 1 to float up from the peripheral surface of the metal pipe P is applied. For example, in the bag insertion device S shown in FIG. 1D, since the insertion tube S1 is long, a moment is generated about the base 2 of the pedestal 1 as a fulcrum, so that the base 2 is separated from the peripheral surface of the metal pipe P. There is a risk that it will move in the direction in which it floats. In this embodiment, in order to prevent such a phenomenon, the base portion 2
In, the sleeve portion 2S (see FIG. 6) protruding along the axial direction of the metal pipe P is integrated. This allows
Depending on the device mounted on the base 1, the base 1 and the metal pipe P
It is prevented that the adhesiveness between and is damaged. In addition, by sandwiching a member (not shown) such as rubber having a large friction coefficient between the mounting surface of the base portion 2 of the pedestal 1 and the outer peripheral surface of the metal pipe P, the pedestal 1 becomes less slippery. In addition to the lifting prevention described above, it is also possible to prevent the careless rotation.

In this embodiment, the magnetic attraction state of the pedestal 1 with respect to the metal pipe P or the release of the magnetic attraction can be performed, so that the pedestal 1 can be fixed while being mounted on the upper peripheral surface of the metal pipe P. You can Therefore, the chain that has been conventionally required is not used. For this reason, the excavation range can be a very narrow range in which the upper peripheral surface of the metal pipe P is exposed, and thus unlike the case where excavation on the road increases, the time and effort for waste soil treatment and backfilling work is extremely large. It needs less. As a result, it is possible to perform the shut-off work including the perforation / tap stand or the emergency shut-down in a state where the influence on the environment is reduced.

[0023]

According to the inventions of claims 1 and 2,
The excavation range at the time of installing the pedestal is intended only for the work position of the pipeline, and particularly in the invention of claim 2, the pedestal is installed only by exposing the upper half circumferential surface of the metal pipeline to the outside. be able to. As a result, it is possible to eliminate the conventional excavation of the lower part of the lower surface of the metal pipe, so that the number of man-hours required for excavation work and the man-hours required for waste soil treatment and backfill work that occur during excavation It is possible to make the working time extremely short.

According to the third aspect of the present invention, the pedestal is provided with the pedestal by selecting the state in which the permanent magnet provided in the pedestal is used to form the magnetic path including the duct and the state in which the magnets repel each other. Can be magnetically attracted to. Therefore, unlike the case where the electromagnet is used, the pedestal can be stably fixed without requiring power supply equipment, explosion-proof equipment, or the like.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a procedure of an installation method according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a pedestal used in the installation method shown in FIG. 1 is attached to a metal pipe line.

FIG. 3 is a schematic plan view of the conduit pedestal shown in FIG.

FIG. 4 is a perspective view for explaining a configuration of a rotating magnet body and a fixed magnet body used in the conduit pedestal shown in FIG.

FIG. 5 is a schematic diagram for explaining a state of action of magnetic force on a metal pipe due to the facing relationship between the rotating magnet body and the fixed magnet body shown in FIGS. 2 and 3, and FIG. The state where the poles are opposed to each other and the state where the magnetic poles are opposed to each other are shown in (b).

FIG. 6 is a perspective view showing a partially modified example of the pedestal shown in FIG.

FIG. 7 is a diagram for explaining a procedure in a conventional example of a pedestal installation method.

[Explanation of symbols]

1 pedestal 2 base 2S sleeve part 3 rotation operation part 3A inner peripheral teeth 5 rotary magnet body 6 yoke 7 fixed magnet body 8 support shaft 9 of rotary magnet body gears S meshing with inner peripheral teeth S base 1 of construction machine One bag insertion device

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akihito Mohri 2-19-6 Nakaikenoue, Ota-ku, Tokyo Daikon Precision Co., Ltd. (56) References: 58-89212 (JP, U) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) B23Q 9/02 B23B 45/14 B23G 1/26 F16L 41/04

Claims (3)

(57) [Claims] 1. A method of installing a pedestal to be installed when a device used for work such as punching or tapping is held in a part of a metal pipeline, which is a method of burying the metal pipeline. Excavate so that only the work position of the metal conduit is exposed to the outside, and attach a pedestal with a structure capable of magnetic attraction to the work position of the metal conduit peripheral surface exposed to the outside. Then, by placing the pedestal and the metal pipe in a magnetically attracted state, the work machine such as the punching or tapping is attached to the pedestal to start the work. Installation method. 2. The pipe pedestal installation method according to claim 1, wherein the excavation range in the peripheral portion of the pipeline is targeted only at a portion corresponding to the upper half of the metal pipeline. Characteristic pipe pedestal installation method. 3. The pipe line pedestal installation method according to claim 1, wherein the pedestal is provided with a plurality of permanent magnets facing the outer peripheral surface of the metal pipe line, and the permanent magnets are magnets. It is configured to be able to select a case where the above-mentioned metal pipe path is included in the magnetic path between each other and a case where the magnets are magnetically short-circuited and the above magnetic pipe path is not included in the magnetic path between the magnets. Characteristic pipe pedestal installation method.