Drill work device and drill work method

Abstract

To provide a drill work device which can smoothly perform drill work, and a drill work method.SOLUTION: A drill work device 100 forming a pair of cut pipe parts which are separated from each other by cutting an existing pipe 1 comprises: a driller 3 having a cutter 31 for cutting the existing pipe 1; a housing 4 for supporting the driller 3, and accommodating the cutter 31; a divided box body 6 for surrounding the existing pipe 1 in a sealed state, and supporting the housing 4; movement prevention tools 7 arranged at both end parts of the divided box body 6 along an axial core X of the existing pipe 1, and prohibiting the movement of the divided box body 6; and an axial core maintenance mechanism 8 for maintaining the axial core X of a pair of the cut pipe parts in the same direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drilling device and a drilling method for cutting an existing pipe with a drilling machine to form a pair of cut pipe portions spaced apart from each other. [Background technology]

[0002] Conventionally, a drilling work device has been known that includes a two-piece housing that surrounds the existing pipe, a work gate valve that is mounted on the housing, and a drilling machine that is mounted on the work gate valve in order to cut the existing pipe with a drilling machine to form a pair of cut pipe sections that are spaced apart from each other (so-called full cut) (see, for example, Patent Document 1).

[0003] In the drilling work device described in Patent Document 1, when an existing pipe is cut using a drilling machine to form a pair of cut pipe sections, a concrete foundation is laid in advance on the lower part of the casing to support the weight around the casing and prevent the cut pipe sections from bending. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-74123 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the drilling work device described in Patent Document 1 has problems such as a need for a curing period for the concrete foundation, which lengthens the construction period. In addition, when the ground supporting the concrete foundation is soft, the heavy gate valve for work and the drilling machine cause ground subsidence, which tilts the existing pipe, making it impossible to drill, and making it impossible to retrieve the cutter of the drilling machine.

[0006] Therefore, there is a demand for a drilling device and a drilling method that can smoothly perform drilling operations. [Means for solving the problem]

[0007] A characteristic configuration of a drilling work device according to the present invention is a drilling work device for cutting an existing pipe to form a pair of cut pipe sections spaced apart from each other, comprising: a drilling machine having a cutter for cutting the existing pipe; a housing for supporting the drilling machine and accommodating the cutter; a split housing for sealingly surrounding the existing pipe and supporting the housing; movement prevention devices disposed at both ends of the split housing along the axis of the existing pipe and preventing movement of the split housing; and an axis maintaining mechanism for maintaining the axes of the pair of cut pipe sections in the same direction. The axis center maintaining mechanism supports the split housing from below and has a movable support member that is vertically movable, and the movable support member is a portion of the split housing that is perpendicular to the axis center of the existing pipe and is disposed on the lower side of the split housing. It is at the point.

[0008] In this configuration, the movement prevention device prevents the split housing from moving along the axis of the existing pipe, so after cutting the existing pipe inside the split housing, the pair of cut pipe sections can be formed simply by removing the drilling machine and covering the split housing, which shortens the construction period.

[0009] Moreover, in this configuration, since an axis maintaining mechanism is provided for maintaining the axis of the pair of cutting pipes, even if the ground subsides due to soft ground, the axis maintaining mechanism maintains the axis of the pair of cutting pipes in the same direction, so there is no inconvenience such as being unable to drill or being unable to retrieve the cutter of the drilling machine. In this way, a drilling operation device that can smoothly perform drilling operation can be provided. Furthermore, if the shaft center maintaining mechanism has a movable support member, the structure is simple. The construction period can be significantly shortened.

[0010] A characteristic configuration of a drilling work apparatus according to the present invention is a drilling work apparatus for cutting an existing pipe to form a pair of cut pipe sections spaced apart from each other, comprising: a drilling machine having a cutter for cutting the existing pipe; a housing supporting the drilling machine and accommodating the cutter; a split housing surrounding the existing pipe in a sealed state and supporting the housing; movement prevention devices disposed at both ends of the split housing along the axis of the existing pipe and preventing movement of the split housing; and an axis maintaining mechanism for maintaining the axes of the pair of cut pipe sections in the same direction, the split housing having an upper housing and a lower housing with a split surface in the axis direction, the lower housing having a bottom provided with a discharge section that opens in the vertical direction, the axis maintaining mechanism having a movable support member that supports the bottom of the lower housing from below and is movable up and down, the movable support members being disposed at positions facing each other across the discharge section at the bottom of the lower housing, The point is that

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[0019] The characteristic configuration of the drilling method of the present invention includes a split housing installation process for installing a split housing so as to surround the existing pipe in a sealed state; a support process for abutting a movable support member that can move up and down from the underside of the split housing; a movement prevention process for fixing a movement prevention device that prevents the split housing from moving to both ends of the split housing; a work valve installation process for connecting a work gate valve to the split housing supported by the movable support member; a housing installation process for connecting a housing that accommodates a cutter of a drilling machine to the work gate valve; and a drilling process for cutting the existing pipe with the cutter to form a pair of cut pipe portions spaced apart from each other while maintaining the axis of the existing pipe in the same direction with the movable support member, wherein the movable support members are arranged in multiple locations on the underside of the split housing at locations on the split housing that are perpendicular to the axis of the existing pipe.

[0020] A characteristic configuration of the drilling method according to the present invention includes a split housing installation step of installing a split housing so as to surround an existing pipe in a sealed state, a support step of abutting a movable support member movable up and down from the underside of the split housing, a movement prevention step of fixing a movement prevention device for preventing the movement of the split housing to both ends of the split housing, a work valve installation step of connecting a work gate valve to the split housing supported by the movable support member, a housing installation step of connecting a housing containing a cutter of a drilling machine to the work gate valve, and a drilling step of cutting the existing pipe with the cutter while maintaining the axis of the existing pipe in the same direction with the movable support member to form a pair of cut pipe portions spaced apart from each other. The split housing has an upper housing and a lower housing having a split surface in the axial direction, the lower housing has a bottom provided with a discharge part that opens in the vertical direction, and the plurality of movable support members are disposed at positions facing each other across the discharge part at the bottom of the lower housing. It is at the point.

[0021] In this method, because the movement prevention device prevents the split housing from moving along the axis of the existing pipe, after cutting the existing pipe inside the split housing, the pair of cut pipe sections can be formed simply by removing the drilling machine and covering the split housing, which shortens the construction period.

[0022] Moreover, since the movable support member maintains the axis of the existing pipe horizontal while cutting the existing pipe, even if the ground subsides due to the heavy objects (the gate valve for work, the drilling machine, and the housing), the movable support member maintains the axes of the pair of cutting pipe parts in the same direction, and there is no inconvenience such as being unable to drill or being unable to retrieve the cutter of the drilling machine. Therefore, a drilling method that allows the drilling work to be performed smoothly can be provided. [Brief description of the drawings]

[0023] [Figure 1] FIG. 2 is a side view showing the drilling work device according to the present embodiment. [Diagram 2]FIG. 1 is a front view showing a drilling operation device according to an embodiment of the present invention. [Diagram 3] FIG. 11 is a diagram showing a process from installing the divided housing to installing the working valve. [Figure 4] 11A to 11C are diagrams showing a housing installation process. [Diagram 5] FIG. [Figure 6] 13A to 13C are diagrams showing the gate valve installation process. [Figure 7] FIG. [Figure 8] FIG. 11 is a side view showing a drilling work device according to another embodiment. [Figure 9] FIG. 11 is a front view showing a drilling work device according to another embodiment. [Figure 10] FIG. 11 is a front view showing a drilling work device according to another embodiment. [Figure 11] 13A and 13B are diagrams showing a movement prevention device according to another embodiment. [Figure 12] 13A and 13B are diagrams showing a movement prevention device according to another embodiment. [Figure 13] 13A and 13B are diagrams showing a movement prevention device according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment of a drilling apparatus and a drilling method according to the present invention will be described with reference to the drawings. In this embodiment, as an example of a drilling apparatus, a work apparatus for installing a gate valve between a pair of cut pipe parts separated from each other and formed by cutting an existing water pipe will be described. However, the present invention is not limited to the following embodiment, and various modifications are possible within the scope of the gist thereof.

[0025] 1 to 7 show an example of a drilling work apparatus 100 for drilling a middle portion of a water pipe 1 (an example of an existing pipe) buried underground in the ground in an uninterrupted flow state (a state in which the flow of water as a fluid is maintained), cutting it off in the direction of an axis X, and then installing a gate valve 2 between a pair of cut pipe portions 11, 11 spaced apart from each other. The drilling work method in this embodiment is carried out using this drilling work apparatus 100.

[0026] As shown in FIG. 1, the drilling work apparatus 100 comprises a drilling machine 3, a housing 4, an operation gate valve 5, a divided casing 6, a movement prevention device 7, and an axis center maintaining mechanism 8.

[0027] The drilling machine 3 is equipped with a cylindrical hole saw 31 (an example of a cutter) for cutting the water pipe 1, a center drill 32 located at the axial center of the hole saw 31 and with a tip protruding from the hole saw 31, and a rotating shaft 33 connected to the hole saw 31. The drilling machine 3 is supported by the housing 4 by being connected to the housing 4, and the hole saw 31 is housed inside the housing 4 before drilling.

[0028] The diameter of the hole saw 31 is larger than the diameter of the water pipe 1, and the water pipe 1 cut by the hole saw 31 is separated along the axis X to form a pair of cut pipe sections 11 spaced apart from each other (see also FIG. 5). The center drill 32 is provided with a plurality of fall prevention pieces (not shown), which hold the cut pieces 12, which are short-tube-shaped water pipe 1 (see also FIG. 5).

[0029] The housing 4 is formed in a cylindrical shape, and a lower flange 41 is connected to an upper flange 51 of the work gate valve 5 with a plurality of bolts 42a and nuts 42b. The work gate valve 5 includes a box-shaped valve body 52 and a plate-shaped valve body 53, and a lower flange 54 of the valve body 52 is connected to an upper flange 61 of the divided housing 6 with a plurality of bolts 55a and nuts 55b. The valve body 53 is configured to be movable back and forth inside the valve body 52, and by moving the valve body 53 forward (closing the valve), the water pipe 1 and the inside of the housing 4 are not in communication, and by moving the valve body 53 backward (opening the valve), the water pipe 1 and the inside of the housing 4 are in communication.

[0030] The split housing 6 is a split T-shaped pipe that hermetically surrounds a part (a portion to be cut) of the water pipe 1 in a water-passing state, and an annular seal material S is provided on the inner peripheral surface of each of both ends 60, 60 along the axis X of the water pipe 1. The split housing 6 is fixed in position relative to the water pipe 1 in a rotation-preventing state by a plurality of position fixing bolts Ba screwed into both ends 60, 60. At both ends 60, 60 of the split housing 6, engaged portions 60a that engage with the movement prevention devices 7, 7 are formed protruding outward in the radial direction of the water pipe 1, outside the position fixing bolts Ba. The split housing 6 in this embodiment supports the drilling machine 3, the housing 4, and the work gate valve 5.

[0031] The split housing 6 in this embodiment has a two-part structure in which an upper housing 62 and a lower housing 63, each having a split surface in the axis X direction (horizontal direction), are connected to each other. A split flange 62a of the upper housing 62 and a split flange 63a of the lower housing 63 are connected in a sealed state by a bolt 64a and a nut 64b. A bottom 63b of the lower housing 63 is formed in a mortar shape, and a discharge part 63b1 for discharging chips generated during cutting by the drilling machine 3 is provided near the center of the bottom 63b. The discharge part 63b1 opens in the vertical direction, and this opening is closed by a plug. The split housing 6 may be configured in three or more parts, and the upper housing 62 and the lower housing 63 may be connected by welding or the like. In addition, instead of fixing the positions of both ends 60, 60 in a sealed state using the annular seal material S and the position fixing bolt Ba, a split ring having a sealing function may be attached to fix the positions.

[0032] The pair of movement prevention devices 7, 7 are disposed at both ends 60, 60 of the split housing 6 along the axis X of the water pipe 1, respectively, and are detachment prevention fittings that prevent the split housing 6 from moving. In other words, the movement prevention device 7 prevents the split housing 6 from moving along the axis X of the water pipe 1. The movement prevention device 7 in this embodiment has a two-part structure in which an upper half member 7A and a lower half member 7B having a split surface in the axis X direction (horizontal direction) are connected to each other. A flange portion 7Aa of the upper half member 7A and a flange portion 7Ba of the lower half member 7B are connected by a bolt 73a and a nut 73b.

[0033] The movement prevention device 7 has a semi-split annular base 71 and an extension 72 extending from the base 71 along the axis X. An accommodating groove 71a is formed on the inner peripheral surface of the base 71 to accommodate a claw member 73 that bites into the water pipe 1. The base 71 also has a plurality of through holes 71b into which a plurality of pressing bolts Bb that press the claw member 73 toward the water pipe 1 are screwed.

[0034] The extension 72 is formed in a hook shape, and has at its tip an engagement portion 72a that engages with the engaged portion 60a of the split housing 6. By abutting the engagement portions 72a of the pair of movement prevention devices 7, 7 against the engaged portion 60a of the split housing 6 and screwing the pressing bolt Bb into the through hole 71b, the claw member 73 bites into the outer surface of the water pipe 1, and movement of the split housing 6 in the direction of the axis X is prevented.

[0035] 1 and 2, the axis maintaining mechanism 8 has a plurality of jacks 8A (one example of movable support members) that maintain the axis X of the pair of cut pipe parts 11, 11 in the same direction, and a plate member 8B such as an iron plate that is placed on the excavated ground. The jacks 8A support the divided housing 6 from below and are configured to be movable up and down. The jack 8A has a support part 80 placed on the plate member 8B, a rotation-preventing nut 81 fixed to the support part 80, a cylindrical moving part 83 that is movable up and down relative to the support part 80, and a moving nut 82 that abuts against the lower end of the moving part 83.

[0036] The support part 80 has a disk-shaped base 80a that contacts the plate member 8B on a surface parallel thereto, and a rod-shaped part 80b that extends upward from the base 80a, and the rod-shaped part 80b is formed with a male thread into which a moving nut 82 is screwed. The anti-rotation nut 81 is fixed to the underside of the rod-shaped part 80b at the location where the male thread is formed, and prevents the support part 80 from rotating by being gripped with a tool. The tip part 83a of the moving part 83 is formed with a concave hole into which the head of the bolt 64a located on the split flange 63a of the lower housing 63 engages, and the base end part 83b of the moving part 83 is in contact with the moving nut 82. The movable nut 82 is rotated by a tool to move it upward, so that the movable part 83 rises, and in a state where the head of the bolt 64a is inserted into a concave hole formed in the tip part 83a of the movable part 83, the end face of the tip part 83a abuts against the split flange 63a, thereby pressing the split flanges 62a, 63a. In this embodiment, the split housing 6 is well sealed by the multiple jacks 8A pressing the split flanges 62a, 63a. It is also possible to abut the tip part 83a against the head of the bolt 64a without providing a concave hole in the tip part 83a of the movable part 83.

[0037] In this embodiment, since the axis maintaining mechanism 8 is provided to maintain the axis X of the pair of cutting pipe parts 11, 11, even if ground subsidence occurs due to soft ground, the axis maintaining mechanism 8 maintains the axis X of the pair of cutting pipe parts 11, 11 in the same direction, so there is no inconvenience such as being unable to drill holes or being unable to retrieve the hole saw 31. Furthermore, if the axis maintaining mechanism 8 has a jack 8A, the structure is simplified and the construction period can be significantly shortened. Moreover, since the split flanges 62a, 63a located on the outside of the split housing 6 are pressed by the jack 8A, the installation of the jack 8A is facilitated, improving construction efficiency.

[0038] Next, a drilling method using the drilling device 100 in this embodiment will be described with reference to Figs.

[0039] The drilling method includes a split housing installation step of installing a split housing 6 so as to surround the water pipe 1 in a sealed state, a support step of abutting a jack 8A movable up and down from the underside of the split housing 6, a movement prevention step of fixing a movement prevention device 7 that prevents the split housing 6 from moving to both end portions 60 of the split housing 6, a work valve installation step of connecting a work gate valve 5 to the split housing 6 supported by the jack 8A, a housing installation step of connecting a housing 4 that accommodates a hole saw 31 of the drilling machine 3 to the work gate valve 5, and a drilling step of cutting the water pipe 1 with the hole saw 31 while maintaining the axis X of the water pipe 1 in the same direction (horizontal direction) with the jack 8A to form a pair of cut pipe portions 11, 11 spaced apart from each other.

[0040] The drilling method also includes a cutting recovery process in which the center drill 32 and hole saw 31 holding the cutting piece 12 are moved upward and stored in the housing 4 and the work gate valve 5 is closed, a gate valve installation process in which the drilling machine 3 is removed and the gate valve 2 is stored in the housing 4A, and the work gate valve 5 is opened to install the gate valve 2 in a sealed state between the pair of cutting pipe sections 11, 11, and a lid installation process in which the housing 4A and the work gate valve 5 are removed and a lid 9 is installed in a sealed state on the split housing 6.

[0041] (1) Split case installation process As shown in Fig. 3, first, a planned cutting location of the water pipe 1 is excavated, and a plate member 8B such as an iron plate is placed on the excavated ground. Then, a split flange 62a of the upper housing 62 and a split flange 63a of the lower housing 63 are connected in a sealed state to a part (planned cutting location) of the water pipe 1 in a water-passing state with bolts 64a and nuts 64b. Then, a plurality of position fixing bolts Ba are screwed into both ends 60, 60 of the split housing 6, and the split housing 6 is fixed in position relative to the water pipe 1 in a non-rotating state. Although not shown, a flange cover is attached to the upper flange 61 of the split housing 6 with the split housing 6 attached to the water pipe 1, and the split housing 6 is filled with water to perform a water pressure test.

[0042] (2) Support process Next, multiple jacks 8A are placed on the plate member 8B, and while holding the anti-rotation nut 81 with a tool, the moving nut 82 is rotated with the tool, and with the head of the bolt 64a inserted into the concave hole formed in the tip 83a of the moving part 83, the end face of the tip 83a is brought into contact with the split flange 63a of the lower housing 63. Next, the moving nut 82 is further rotated with the tool to further tighten it, so that the multiple jacks 8A press evenly against the split flanges 62a, 63a, and the split housing 6 is well sealed.

[0043] (3) Movement prevention process Next, the engaging portions 72a of the pair of movement prevention devices 7, 7 are brought into contact with the engaged portions 60a of the split housing 6, and the flange portion 7Aa of the upper half member 7A and the flange portion 7Ba of the lower half member 7B are connected with the bolts 73a and nuts 73b. Then, by screwing the pressing bolts Bb into the through holes 71b, the claw members 73 bite into the outer surface of the water pipe 1, and the movement of the split housing 6 in the direction of the axis X is prevented.

[0044] (4) Installation of working valve Next, the lower flange 54 of the valve box 52, in which the plate-shaped valve body 53 is housed, is connected to the upper flange 61 of the split housing 6 with a plurality of bolts 55a and nuts 55b, thereby mounting the work gate valve 5 to the split housing 6. At this time, the plurality of jacks 8A are operated as necessary to maintain the axis X of the water pipe 1 in the same direction (horizontal direction).

[0045] (5) Housing installation process Next, as shown in Fig. 4, the lower flange 41 of the housing 4 supporting the drilling machine 3 with the hole saw 31 housed therein before drilling is connected to the upper flange 51 of the work gate valve 5 with multiple bolts 42a and nuts 42b, and the housing 4 is attached to the work gate valve 5. At this time, multiple jacks 8A are operated as necessary to maintain the axis X of the water pipe 1 in the same direction (horizontal). Through the above steps, the split housing 6 supports the drilling machine 3, the housing 4, and the work gate valve 5, and the axis X of the water pipe 1 is maintained in the same direction (horizontal) by the jacks 8A.

[0046] (6)Drilling process Next, the rotating shaft 33 of the drilling machine 3 is rotated, and the water pipe 1 is cut by the hole saw 31. As a result, the water pipe 1 is cut along the axis X, and a pair of cut pipe parts 11 separated from each other are formed (see also FIG. 5). At this time, multiple jacks 8A are operated as necessary to maintain the axis X of the pair of cut pipe parts 11 in the same direction (horizontal direction). Because the axis X of the water pipe 1 is maintained in the same direction (horizontal direction) by these jacks 8A, there is no inconvenience of being unable to drill even if ground subsidence occurs due to soft ground.

[0047] (7) Section recovery process Next, as shown in Fig. 5, while the anti-fallout block provided on the center drill 32 holds the section 12 of the cut water pipe 1, the rotating shaft 33 of the drilling machine 3 is rotated to move the center drill 32 and the hole saw 31 upward. As a result, the center drill 32 holding the hole saw 31 and the section 12 after drilling is housed inside the housing 4. At this time, the axis X of the water pipe 1 is maintained in the same direction (horizontal direction) by the jack 8A, so that the hole saw 31 and the like will not become impossible to retrieve. Next, the work gate valve 5 is closed.

[0048] (8) Gate valve installation process Next, the drilling machine 3 and the housing 4 are removed. Then, although not shown, a chip collector is installed on the working gate valve 5, the working gate valve 5 is opened, and the chip collector is operated to remove the chips accumulated on the bottom 63b of the divided housing 6. Next, as shown in FIG. 6, the working gate valve 5 is closed, and the housing 4A supporting the holder 21 for holding the gate valve 2 is connected to the working gate valve 5. Next, the working gate valve 5 is opened, and the holder 21 is operated to mount the gate valve 2 in a sealed state between the pair of cutting pipe parts 11, 11. The gate valve 2 in this embodiment is integrally formed with a disk-shaped base 22 whose periphery is sealed and a square column-shaped valve accommodating part 23 whose periphery is sealed. The valve accommodating part 23 accommodates a disk-shaped valve part (not shown) that can be rotated by rotating the operating part 24 to switch the flow path of the water pipe 1 between a communication state and a cut-off state.

[0049] (9) Lid installation process Next, the housing 4A supporting the holder 21 and the operational gate valve 5 are removed, leaving the split housing 6 and the gate valve 2 attached to the water pipe 1. Then, the lid 9 is fastened and fixed to the upper flange 61 of the split housing 6, resulting in the final form. The jack 8A is removed at any time after the housing 4A and the operational gate valve 5 are removed, but the jack 8A may be left in place.

[0050] In this embodiment, a pair of movement prevention devices 7, 7 prevent the split housing 6 from moving along the axis X of the water pipe 1, so that after cutting the water pipe 1 inside the split housing 6, the pair of cut pipe sections 11, 11 can be formed simply by removing the drilling machine 3 and placing a lid 9 on the split housing 6. This makes it possible to shorten the construction period.

[0051] [Another embodiment] 8 and 9, the axis maintaining mechanism 8 may be a plurality of jacks 8C (one example of a movable support member) in contact with the bottom 63b (lower surface of the main body) of the lower housing 63. The jacks 8C in this embodiment are configured to be movable up and down by a fluid (water, hydraulic pressure, air, etc.) supplied by a pump P. In this embodiment, the bottom 63b of the lower housing 63 has a contact portion 63c with a horizontal end face protruding therefrom at a portion where the jacks 8C contact.

[0052] The jack 8C supports the split housing 6 from below and is configured to be vertically movable. The jack 8C has a cylindrical support part 84 placed on the plate member 8B and a cylindrical moving part 85 that can move vertically relative to the support part 80 by fluid pressure. A tip end 85a of the moving part 85 abuts against the abutment part 63c, and a base end 85b receives fluid pressure, causing the split flanges 62a, 63a to come into close contact with each other.

[0053] The pair of movement prevention devices 7, 7 in this embodiment are disposed integrally with both ends 60, 60 of the split housing 6 along the axis X of the water pipe 1. That is, the movement prevention device 7 omits the engagement portion 72a described above, and a half-split annular base portion 71 is formed integrally with both ends 60, 60 of the split housing 6.

[0054] In this embodiment, the axis maintaining mechanism 8 is provided to maintain the axis X of the pair of cutting pipes 11, 11. Even if ground subsidence occurs due to soft ground, the axis maintaining mechanism 8 maintains the axis X of the pair of cutting pipes 11, 11 in the same direction, so there is no inconvenience of being unable to drill holes or to retrieve the hole saw 31. In this embodiment, the multiple jacks 8C are in contact with the bottom 63b of the lower housing 63, so the split housing 6 can be stably supported. Furthermore, in this embodiment, the moving parts 85 of the jacks 8C are moved up and down by the fluid supplied by the pump P, so that a rapid response can be made even if ground subsidence occurs.

[0055] [Other embodiments] 10, the axis center maintaining mechanism 8 has a hanging mechanism 8D that hangs the drill 3, the housing 4, and the split housing 6 to receive the load. The hanging mechanism 8D includes a plurality of hanging cables 8Da, a load meter 8Db that can measure the hanging load by bundling the plurality of hanging cables 8Da, and a heavy machine (not shown) that hangs up the hanging cables 8Da. By having the hanging mechanism 8D bear the load of the drill 3 and the housing 4, it is possible to prevent the axis center X of the pair of cut pipe parts 11, 11 from being misaligned due to the weight. 11, the annular seal material S provided on the inner peripheral surface of each of the end portions 60, 60 of the split housing 6 may be composed of a pair of annular seal members Sa, Sa and an adhesive member Sb connecting the pair of annular seal members Sa, Sa. In this case, a through hole 60b is formed in the end portion 60 of the split housing 6, and the adhesive member Sb is poured into the through hole 60b and allowed to solidify, and then the through hole 60b is sealed with a plug member 60c. This improves the sealing performance of the split housing 6. 12, a plurality of position fixing bolts Ba may be provided, each screwed into both ends 60, 60 of the split housing 6. This allows the water pipe 1 and the split housing 6 to be centered, and reliably prevents the split housing 6 from rotating. 13, inner surfaces 72a1 of the engaging portions 72a of the pair of movement prevention devices 7, 7 may be brought into contact (metal touch) with the end faces 62a1 of the engaged portions 60a of the split housing 6. This reliably prevents the split housing 6 from rotating and moving in the direction of the axis X. (e) In the above embodiment, a water pipe 1 through which clean water flows as a fluid is given as an example of a fluid pipe, but a pipe through which liquid or gas can flow may also be used. [Industrial Applicability]

[0056] INDUSTRIAL APPLICABILITY The present invention can be used in a drilling operation device and a drilling operation method for cutting an existing pipe with a drilling machine to form a pair of cut pipe portions that are spaced apart from each other. [Explanation of symbols]

[0057] 1: Water pipe (existing pipe) 3: Drilling machine 4: Housing 5: Operation gate valve 6: Split case 7: Movement prevention equipment 8: Axial center maintenance mechanism 8A: Jack (movable support member) 8C: Jack (movable support member) 8D: Suspension mechanism 11: Cutting pipe section 31: Hole saw (cutter) 60: Both ends 62: Upper case 62a: Split flange 63: Lower housing 63a: Split flange 63b: Bottom 100:Drilling equipment X: Axial center

Claims

1. A drilling work device for cutting an existing pipe to form a pair of cut pipe sections spaced apart from each other, comprising: A drilling machine having a cutter for cutting the existing pipe; a housing supporting the punch and housing the cutter; a divided housing that hermetically surrounds the existing pipe and supports the housing; a movement prevention device disposed at both ends of the split housing along the axis of the existing pipe and configured to prevent the split housing from moving; and an axis maintaining mechanism for maintaining the axes of the pair of cut pipe portions in the same direction.

2. 2. The drilling operation device according to claim 1, wherein the axis centering mechanism includes a movable support member that supports the divided housing from below and is vertically movable.

3. 3. The drilling operation device according to claim 2, wherein the movable support member presses against a split flange of the split housing.

4. 4. The drilling operation device according to claim 2, wherein the movable support member abuts against a lower surface of the main body of the divided housing.

5. 5. A drilling operation device according to claim 2, wherein the movable support member is configured to be movable up and down by fluid supplied by a pump.

6. 6. The drilling operation device according to claim 1, wherein the axis maintaining mechanism has a suspending mechanism that suspends the drill and the housing to receive a load.

7. a split housing installation process for installing a split housing so as to surround the existing pipe in a sealed state; a supporting step of abutting a movable support member movable up and down from the lower side of the split housing; a movement prevention step of fixing a movement prevention device that prevents the movement of the divided housing to both ends of the divided housing; an operation valve installation process of connecting an operation gate valve to the divided housing supported by the movable support member; a housing installation process for connecting a housing accommodating a cutter of a drilling machine to the work gate valve; and a drilling step of cutting the existing pipe with the cutter while maintaining the axis of the existing pipe in the same direction with the movable support member to form a pair of cut pipe sections spaced apart from each other.

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