Duct boring device

Abstract

To provide a duct boring device in which an indented valve seat part formed on an inner surface of a neck portion can be brought into contact with a work valve body in a clean state without causing any trouble due to entry of swarf generated as a result of boring, and which thereby is capable of maintaining a high degree of sealing performance.SOLUTION: A duct boring device at least comprises: a housing 105 in which a fluid pipe 101 is fitted in a sealed state and which has a divided structure; a work valve 103 equipped with a work valve body 131 that is brought into contact with and is separated from an indented valve seat part 105i provided inside a neck portion 105d of the housing 105, the work valve 103 configured to be detachably attached to the neck portion 105d; and a boring machine 107 equipped with a cutter 172 that is inserted in the housing 105 and has a cutting blade for boring the fluid duct 101 in a state where fluid flow is not interrupted, and a movement mechanism 173 which moves the cutter 172 forward or rearward. The neck portion 105d is provided with a suction pipe 280 which discharges swarf with a fluid in the housing 105.SELECTED DRAWING: Figure 30

Description

[Technical field]

[0001] The present invention relates to a pipe piercing device having a housing with a split structure that hermetically fits around a fluid pipe, an operating valve equipped with an operating valve body that opens and closes the inside of the housing, and a drilling machine that drills, cuts or cuts the fluid pipe within the housing without interrupting the flow. [Background technology]

[0002] Conventional pipe drilling devices involve fitting a split-structure housing (split T-pipe) onto an existing fluid pipe in a hermetic manner, connecting a drilling machine to the open end of the neck that constitutes the housing, and drilling the fluid pipe inside the housing using the drilling machine. After this, an operating valve provided in the housing temporarily seals off the inside of the neck of the housing, and then connecting a pipe connecting member to the open end of the housing in place of the drilling machine after drilling (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-28058 A (page 3, figure 3) Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, chips generated when the drilling machine drills the pipe wall of the fluid pipe enter the neck of the housing and accumulate in the valve seat on the inner surface of the neck that contacts the working valve for opening and closing the neck, and the chips interfere with the contact portion between the working valve and the valve seat, resulting in problems such as the inability to maintain sealing by the working valve. In particular, in order to obtain high adhesion with the working valve, a concave valve seat into which the periphery of the working valve can be inserted may be formed on the inner surface of the neck, and chips are likely to accumulate in such a concave valve seat, increasing the risk of impairing sealing.

[0005] The present invention has been made in response to these problems, and aims to provide a pipe drilling device in which the concave valve seat portion formed on the inner surface of the neck can contact the working valve body in a clean state, without causing problems due to the intrusion of chips generated by drilling, and can maintain high sealing performance. [Means for solving the problem]

[0006] In order to solve the above problems, the pipe punching device of the present invention comprises: A pipe piercing device comprising at least a housing having a split structure for sealingly fitting a fluid pipe, an operating valve having an operating valve body that comes into contact with and separates from a concave valve seat portion provided in a neck portion of the housing, and a piercing machine having a cutter that is inserted into the housing and pierces the fluid pipe in an uninterrupted flow state, The valve is characterized by comprising a cylindrical portion that moves to open and close the opening of the recessed valve seat portion in the neck portion. According to this feature, by blocking the opening of the concave valve seat portion in the neck portion of the housing with the cylindrical portion, chips generated by drilling the fluid pipe inside the housing can be prevented from entering the concave valve seat portion, so that the working valve body can be brought into contact with the clean concave valve seat portion with the cylindrical portion opened, thereby sealing the housing.

[0007] The cylindrical portion is characterized in that it is slidably disposed along the inner surface of the neck portion. According to this feature, by sliding the cylindrical portion along the inner surface of the neck portion, the accuracy of the movement of the cylindrical portion is improved, and the concave valve seat portion can be opened and closed reliably.

[0008] The valve is characterized in that a sealant is provided on the outer periphery of the cylindrical portion on the opposite side to the fluid pipe side relative to the concave valve seat portion, for sealing between the cylindrical portion and the inner surface of the neck portion. According to this feature, by sealing the gap between the outer periphery of the cylindrical portion and the inner surface of the neck portion with a sealant, drilling can be performed without interrupting the flow.

[0009] The cylindrical portion has an inner periphery adjacent to an open end, and a protrusion protruding in the inner diameter direction is formed on the inner periphery of the cylindrical portion. According to this feature, chips that have accumulated on the inner periphery of the cylindrical portion can be retained by the protruding portion without falling.

[0010] The punching machine has a housing cylinder that houses the cutter and is detachably attached to the neck portion of the housing, and a tip portion of the housing cylinder is the cylindrical portion. According to this feature, when the containing cylinder is attached to or detached from the neck portion, the opening of the concave valve seat portion can be opened and closed by the cylindrical portion at the tip of the containing cylinder.

[0011] The present invention is characterized in that a discharge port for discharging chips together with the fluid in the housing is formed in the neck portion on the fluid pipe side relative to the cylindrical portion. According to this feature, chips generated during drilling do not approach the concave valve seat portion, and can be discharged to the outside through a discharge port formed on the base end side, upstream of the concave valve seat portion.

[0012] The cylindrical portion is characterized in that a communication port is formed in the cylindrical portion, the communication port being in communication with a discharge port for discharging chips together with the fluid in the housing. According to this feature, chips that have entered the cylindrical portion can be smoothly discharged to the outside via the communication port and the discharge port.

[0013] The cylindrical portion is characterized by being provided with an engagement portion that enables connection and disconnection with the cutter. According to this feature, the cutter and the cylindrical portion can be easily connected or disconnected by simply moving the cutter.

[0014] The cylindrical portion is characterized in that it is provided with a sweep portion that moves in and out of the recessed valve seat portion as the cylindrical portion moves. According to this feature, even if foreign matter such as cutting chips enters the inside of the concave valve seat portion, the foreign matter can be discharged to the outside of the concave valve seat portion.

[0015] The cylindrical portion is a hole saw that constitutes the cutter. According to this feature, by using a hole saw that is part of the cutter, the structure of the cylindrical portion can be simplified.

[0016] The cylindrical portion is a suction tube that opens and closes to communicate between the inside and the outside of the housing. According to this feature, foreign matter such as cutting chips inside the housing can be discharged to the outside by the suction pipe that communicates with the inside and outside of the housing.

[0017] The inner surface constituting the concave valve seat portion is characterized in that it is formed into a tapered surface that opens toward the opening of the concave valve seat portion. According to this feature, the fluidity of the fluid within the concave valve seat portion can be increased, so that chips can flow out of the concave valve seat portion along the tapered surface without being retained within the concave valve seat portion.

[0018] The inner surface constituting the concave valve seat portion is characterized in that it is formed so as to be inclined with respect to the vertical direction. According to this feature, the fluid flow rate of the fluid within the concave valve seat portion can be increased, so that chips can flow out of the concave valve seat portion along the inclined inner surface without being retained within the concave valve seat portion.

[0019] The working valve is characterized by including a working valve housing that extends substantially vertically downward and is capable of accommodating the working valve body. According to this feature, the chips can be allowed to descend and be introduced into the inside of the working valve housing without being retained in the concave valve seat portion. [Brief description of the drawings]

[0020] [Figure 1] 1 is a front cross-sectional view showing a housing constituting the pipe punching device in Example 1. FIG. [Diagram 2] FIG. 2 is a side view of the housing similar to FIG. [Diagram 3] FIG. 2(a) is a side cross-sectional view showing a housing member of the operating valve, and FIG. 2(b) is a side cross-sectional view showing a mounting member of the operating valve. [Figure 4]FIG. 2 is a partially sectional plan view showing a drilling machine assembled in a housing. [Diagram 5] 5 is a partially sectional front view similar to FIG. [Figure 6] FIG. 4 is a partially cross-sectional plan view showing the state after drilling by the drilling machine. [Figure 7] FIG. 11 is a front cross-sectional view showing a mounting flange tube of a drilling machine in a modified example. [Figure 8] FIG. 4 is a partially sectional plan view showing the state before the flow control valve is installed. [Figure 9] FIG. 4 is a partially sectional plan view showing the state after the flow control valve is installed. [Figure 10] FIG. 10 is a partially sectional front view similar to FIG. [Figure 11] 10(a) is a partially sectional front view showing a housing constituting a pipe punching device in Example 2, and FIG. 10(b) is a partially sectional plan view of the same. [Figure 12] FIG. 2 is a partially cross-sectional plan view showing a state in which holes are being drilled by a drilling machine. [Figure 13] FIG. 4 is a partially cross-sectional plan view showing the state after drilling by the drilling machine. [Figure 14] FIG. 2 is a cross-sectional plan view showing the state before the flow control valve is installed. [Figure 15] 15(a) to 15(c) are enlarged cross-sectional views of the area surrounded by the chain line in FIG. 14, showing a procedure for removing the insertion machine from the flow control valve. [Figure 16] FIG. 4 is a cross-sectional plan view showing the state after the flow control valve is installed. [Figure 17] FIG. 17 is a front cross-sectional view similar to FIG. [Figure 18] FIG. 11 is a front cross-sectional view showing a housing constituting a pipe punching device in Example 3. [Figure 19] FIG. 2 is a partially sectional plan view showing a drilling machine assembled in a housing. [Figure 20] 19(a) is a partially sectional front view showing a state in which holes are being drilled by a drilling machine, and FIG. 19(b) is a sectional view taken along the line AA in FIG. [Figure 21] FIG. 4 is a partially cross-sectional plan view showing the state after drilling by the drilling machine. [Figure 22]FIG. 4 is a partially sectional plan view showing the state after the flow control valve is installed. [Figure 23] 23 is a front cross-sectional view similar to FIG. 22. [Figure 24] 10 is a partially cross-sectional plan view showing a state in which a hole is being drilled by a pipe punching device in Modification 1. FIG. [Diagram 25] This is an enlarged view similar to FIG. [Figure 26] 11 is a partially cross-sectional plan view showing a state in which a hole is being drilled by a pipe punching device in Modification 2. FIG. [Figure 27] 27 is a partially sectional front view similar to FIG. 26. [Figure 28] FIG. 11 is a partially sectional front view showing a state in which a hole is being drilled by a pipe punching device in Modification 3. [Figure 29] FIG. 13 is a partially sectional front view showing a state in which a hole is being drilled by a pipe punching device in Modification 4. [Diagram 30] 29 is a cross-sectional view of FIG. [Diagram 31] 13 is a partially cross-sectional plan view showing a housing of a pipe punching device in a fifth modified example. FIG. [Diagram 32] FIG. 13 is a partially sectional front view showing a state in which a hole is being drilled by a pipe punching device in Modification 6. [Diagram 33] FIG. 13 is a partially sectional front view showing a state in which a hole is being drilled by a pipe punching device in Modification 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] BEST MODE FOR CARRYING OUT THE DISCLOSURE OF THE DRAWINGS FIG. 1 is a perspective view of a pipe punching device according to an embodiment of the present invention; FIG. EXAMPLES

[0022] A pipe drilling device and its installation method according to the first embodiment will be described with reference to Figs. 1 to 10. As shown in Figs. 4 to 7, the pipe drilling device according to the present invention is mainly composed of a housing 5 that fits an existing fluid pipe 1, an operating valve 3 that opens and closes the inside of the housing 5, and a drilling machine 7 that drills the fluid pipe 1 in the housing 5. In this embodiment, as the pipe drilling device and its installation method, a series of steps will be described, from drilling a predetermined location of the existing fluid pipe 1, which is a pipeline component, in the housing 5 under an uninterrupted flow state, to installing a flow control valve 10 in the housing 5. Note that the fluid in the fluid pipe 1 is clean water in this embodiment, but it may be, for example, industrial water, agricultural water, sewage, or other liquid other than water, or it may be gas or a gas-liquid mixture of gas and liquid.

[0023] The fluid pipe 1 of this embodiment is a ductile cast iron pipe, and is formed into a straight pipe with a substantially circular cross section as shown in Figs. 1 and 2. In this embodiment, the fluid pipe 1 is buried in a shallow layer of the ground (not shown), and the pipe direction is disposed substantially horizontally. The fluid pipe according to the present invention may be made of other metals such as cast iron and steel, or made of concrete, vinyl chloride, polyethylene, polyolefin, etc. Furthermore, the inner circumferential surface of the fluid pipe may be covered with an epoxy resin layer, mortar, plating, etc., or an appropriate material may be powder-coated to cover the inner circumferential surface of the fluid pipe. The fluid pipe 1 may be exposed, and the pipe direction may be substantially vertical or inclined.

[0024] The fluid pipe of the present invention is not limited to a straight pipe as in the present embodiment, but may be, for example, a pipe with an irregular shape. The irregular pipe is a general term for a pipe having at least a portion of various irregular shapes, such as a curved pipe section, a branch section, a cross section, a section with a different diameter, a joint ring section, a short pipe section, a drain section, etc.

[0025] First, as shown in Figs. 1 and 2, the outer surface of the fluid pipe 1, which is the mounting location of the pipe punching device according to the present invention, is cleaned, and then a housing 5 constituting the pipe punching device is fitted in a sealed manner via a seal member 4 for sealing the drilling part of the fluid pipe 1 described later. The housing 5 in this embodiment has a multi-part structure divided horizontally, and in this embodiment, it is mainly composed of a first divided body 51 constituting one side and a second divided body 52 constituting the other side. The divided structure of the housing 5 is not limited to this embodiment, and may be divided, for example, vertically, or may be divided into a predetermined number of parts, such as three or more. In this embodiment, the divided housings are joined together in a sealed state by fastening members 2 consisting of bolts and nuts, but this is not limited to this and may be joined by welding, for example.

[0026] As shown in Figures 1 to 3, the first division 51 of the housing 5 is composed of a pipeline housing section 5a extending in the pipeline direction along the fluid pipe 1, and a cylindrical neck section 5d branching off and extending horizontally at approximately the center of the pipeline housing section 5a, i.e., branching off in the lateral direction rather than up-down direction in the actual site, and having an open end section 5c opening in the branching direction and an opening section 5b opening to the side, and is formed in an approximately T-shape when viewed from the side.

[0027] Furthermore, as shown in FIG. 2, the neck portion 5d has a pair of flange-like collar portions 5e, 5e protruding radially outward toward the pipeline direction of the fluid pipe 1, and notches 5f, 5f as engagement portions recessed radially inward at the circumferential center position of the collar portion 5e.

[0028] The neck 5d is provided on its cylindrical circumferential side with a pipe thick section 5g whose outer surface protrudes in the radial direction, and the pipe thick section 5g has an opening 5b that opens toward one side in the pipe direction of the fluid pipe 1. As shown in Fig. 1, the opening 5b opens in a vertically elongated, approximately rectangular shape in side view, and is formed so that the working valve body 31 of the working valve 3 can be inserted therethrough, as described below.

[0029] As shown in FIG. 1, the inner periphery of the neck 5d is provided with an inner periphery 5h which is formed as a generally circular curved surface in a side view and linearly in the horizontal direction, a recessed portion 5i which serves as a concave valve seat portion which is recessed in the outer diameter direction along the circumferential direction at the same position as the opening 5b in the axial direction of the neck 5d, an inner periphery 5j which is formed closer to the base end of the neck 5d than the recessed portion 5i and which is formed generally flush with the inner periphery 5h on the tip side of the neck 5d, and a step portion 5k which protrudes in the inner diameter direction on the base end side of the inner periphery 5j.

[0030] Next, as shown in Figures 3 and 4, the working valve 3 is connected in a sealed manner to the opening 5b of the neck portion 5d. The working valve 3 is mainly composed of a working valve body 31 that slides openably and closably within the housing 5, a housing member 32 as a working valve housing having a housing interior 32a that houses the working valve body 31 so that it can slide horizontally and an opening portion 32b whose one lateral end is open, and a mounting member 33 having a curved inner circumferential surface that can be fitted externally to the neck portion 5d together with the housing member 32.

[0031] 3, 4 and 6, the containing member 32 is rotatably and immovably supported, and is provided with a horizontally extending shaft member 34, with the working valve body 31 screwed into this shaft member 34, and the working valve body 31 is configured to be slidable relative to the containing member 32 by rotating an operating member 35 attached to a tip end 34a of the shaft member 34 protruding outward from the containing member 32. In addition, support portions 36, 36 for supporting a pressing portion 80 and a hydraulic rod 60, which will be described later, are provided on the side surface of the containing member 32 and the side surface of the mounting member 33.

[0032] As shown in FIG. 6, the side of the working valve body 31 facing the branching direction is covered with a plate-shaped seal member 31a, and the peripheral portion of this seal member 31a comes into face contact with the side wall 5r of the recessed portion 5i, thereby hermetically closing the inside of the housing 5. In this way, by providing the recessed portion 5i as a concave valve seat portion on the inner surface of the neck portion 5d, the peripheral portion of the working valve body 31 can be brought into face contact with the side wall 5r of the recessed portion 5i by utilizing the pressure in the fluid pipe 1, so that the sealing performance can be improved. Furthermore, as described above, by bringing the peripheral portion of the working valve body 31 into face contact with the recessed portion 5i formed on the inner surface of the neck portion 5d, the working valve body 31 can be formed into a thin plate-like shape, so that the extension of the branching direction of the housing 5, i.e., the stroke of the drilling machine 7, can be shortened, and the drilling machine 7 does not become eccentric, so that the accuracy of drilling can be improved. In addition, by making the working valve body 31 thin, it is possible to reduce costs by making the working valve body 31 and the housing 5 more compact, and furthermore, because the drilling accuracy is high, the plug body 11 of the control valve 10 described below can be inserted properly, improving watertightness and fluid controllability.

[0033] Regarding the detailed procedure for mounting the working valve 3, first, the housing member 32 is placed on the outer surface of the neck 5d at a position where the open portion 32b communicates with the opening 5b of the neck 5d. At this time, as shown in Fig. 2 and Fig. 3(b), the pipe thickness portion 5g of the neck 5d has a pair of protrusions 5m as positioning portions protruding in the width direction of the opening 5b, and the inner periphery of the engagement portion 32c formed on the upper and lower sides of the open portion 32b of the housing member 32, which is approximately L-shaped in side view and approximately U-shaped in the pipe axis direction, engages with the protrusions 5m, so that the housing member 32 is positioned at a position where the open portion 32b communicates with the opening 5b of the neck 5d. In this way, the protrusions 5m allow the working valve 3 to be accurately mounted to the opening 5b, so that the opening and closing function of the working valve 3 in the housing 5 can be maintained.

[0034] Next, the mounting member 33 is placed on the outer surface of the neck 5d at a position opposite the accommodating member 32 with the neck 5d in between. At this time, as shown in Figures 2 and 3(a), the inner periphery of the engagement portion 33a, which is formed on the mounting member 33 and has a generally U-shape in side view, engages with the thick pipe portion 5g of the neck 5d, so that the mounting member 33 is positioned at a position opposite the accommodating member 32 with the neck 5d in between.

[0035] In this way, the working valve 3 attached to the opening 5b can be extended in the pipeline direction of the fluid pipe 1, so that the side area of ​​the fluid pipe 1 can be utilized as an attachment area for the working valve 3, making it easy to secure said area.

[0036] Next, the housing member 32 and the mounting member 33 are fastened together. As shown in Figures 3(a) and (b), a base end 37a of a bolt 37 is connected to both ends of the mounting member 33 in a hinged manner, and the bolt 37 is rotated toward the housing member 32 and inserted into a gap formed on the outer periphery of the engagement portion 33a of the housing member 32, and further, a nut 38 is screwed onto the tip of the bolt 37 to fasten them together.

[0037] Furthermore, a seal member 39 is disposed in the housing member 32 so as to surround the periphery of the open portion 32b, and by fastening the above-mentioned fastening members, the seal member 39 comes into close contact with the periphery of the opening 5b, thereby sealing the opening 5b and the open portion 32b. In this manner, by installing the working valve 3 in the opening 5b provided in the neck portion 5d, the mounting position of the drilling machine 7 described below can be brought as close as possible to the fluid pipe 1, and as a result, the extension stroke by which the drilling machine 7 approaches the fluid pipe 1 can be shortened, and as a result, the drilling machine 7 can be made smaller, lighter, and less expensive (see FIG. 4).

[0038] Next, as shown in FIG. 4, the drilling machine 7 is connected in a sealed manner to the open end 5c of the neck 5d. The drilling machine 7 is mainly composed of a mounting flange tube 71 as a housing tube, a cutter 72 for drilling holes in the fluid pipe 1, a drive motor 74 for rotating the cutter 72 in the mounting flange tube 71, and an advance / retract mechanism 73 for moving the cutter 72 horizontally. The cutter 72 in this embodiment is formed in a bottomed cylindrical shape with a smaller diameter than the fluid pipe 1, and is composed of a hole saw 72a with a cutting blade along the circumferential direction at its tip, and a center drill 72b arranged coaxially with the rotation axis of the hole saw 72a and protruding beyond the cutting blade. The cutter 72 is arranged concentrically with the open end 5c of the neck 5d of the housing 5, and is inserted into the neck 5d of the housing 5 from the open end 5c side, and can advance at least to a position where it penetrates the pipe wall of the fluid pipe 1.

[0039] Prior to mounting the drilling machine 7, as shown in Figures 4 and 6, a pressing part 80 is first mounted on the support parts 36, 36 of the working valve 3 as an insertion means for inserting the drilling machine 7 into the housing 5. The pressing part 80 is mainly composed of a support plate 81 connected to the support part 36 of the working valve 3, a male screw part 82 fixedly supported by the support plate 81, a pressing piece 83 inserted into the male screw part 82, and a female screw part 84 screwed into the male screw part 82 so as to clamp the pressing piece 83. The pressing part 80 moves the pressing piece 83 in the axial direction of the male screw part 82 by screwing the female screw part 84, and the mounting flange tube 71 of the drilling machine 7 fitted to the pressing piece 83 can be mounted or removed from the neck part 5d of the housing 5. It is also preferable to attach a cap 90 to the tip of the male thread portion 82 to restrict the movement of the mounting flange tube 71, thereby positioning the mounting flange tube 71 when it is moved to the removal side. This cap 90 may be U-shaped in cross section, may have a female thread on its inner surface, or may be a part that constitutes the pressing portion 80.

[0040] The procedure for mounting the drilling machine 7 will be described below. The mounting flange tube 71 of the drilling machine 7 is inserted into the neck 5d by the pressing part 80, and the recessed part 75 formed at the tip of the mounting flange tube 71 is fitted into the open end 5c of the neck 5d. More specifically, the recessed part 75 of the mounting flange tube 71 includes an inner wall part 75a fitted into the side wall of the open end 5c, an outer wall part 75b fitted into the side wall of the open end 5c, and an inner bottom part 75c constituting the base end part of the inner wall part 75a and the outer wall part 75b. The side wall of the open end 5c is sandwiched between the inner wall part 75a and the outer wall part 75b, and the inner bottom part 75c is brought into contact with the end face of the open end 5c, so that the mounting flange tube 71 of the drilling machine 7 is fitted into the open end 5c of the neck 5d in a positioned state. The inner wall portion 75a constitutes the tip portion of the mounting flange cylinder 71, is formed in a generally cylindrical shape with an outer circumferential surface slightly smaller in diameter than the inner circumferential surfaces 5h, 5j of the neck portion 5d, and is inserted into the neck portion 5d up to a position where it covers the opening of the recessed portion 5i. That is, the inner wall portion 75a of the mounting flange cylinder 71 provided in the drilling machine 7 constitutes the cylindrical portion of the present invention.

[0041] Furthermore, the inner wall portion 75a is disposed slidably along the inner peripheral surfaces 5h, 5j of the neck portion 5d, thereby improving the accuracy of the movement of the inner wall portion 75a and enabling the recessed portion 5i to be reliably closed or opened.

[0042] Furthermore, annular seal members 76a, 76b spaced apart in the horizontal direction are provided on the outer peripheral surface of the inner wall portion 75a, and these seal members 76a, 76b straddle the recessed portion 5i in the axial direction of the neck portion 5d and come into close contact with the inner peripheral surfaces 5h, 5j of the neck portion 5d, respectively, thereby preventing foreign matter from entering the recessed portion 5i in this fitted state and sealing the mounting flange tube 71 of the drilling machine 7 and the neck portion 5d of the housing 5. Here, the seal member 76b provided on the side opposite the fluid pipe 1 side from the recessed portion 5i constitutes the sealing material of the present invention.

[0043] Furthermore, in this fitted state, an engaging member 77 having a split structure and including an inner peripheral portion that is substantially U-shaped in cross section and engages with the outer wall portion 75b is attached along the outer periphery of the outer wall portion 75b. Note that the engaging member 77 is not necessarily required.

[0044] Furthermore, the operation of connecting the work valve 3 to the opening 5b of the neck 5d and the operation of connecting the drilling machine 7 to the open end 5c of the neck 5d are not necessarily limited to the order described above, and the operation of connecting the work valve 3 may be performed after the operation of connecting the drilling machine 7, or these connection operations may be performed simultaneously in parallel.

[0045] Next, as shown in Figures 4 and 5, the drilling process of the fluid pipe 1 by the drilling machine 7 will be described. First, with the working valve body 31 of the working valve 3 placed inside the accommodation member 32a of the accommodation member 32 and the inside of the housing 5 open, the cutter 72 is rotated by the drive motor 74 of the drilling machine 7, and the handle 73a that constitutes the advance / retract mechanism 73 is rotated to advance the cutter 72 forward, thereby drilling the wall of the fluid pipe 1 without interrupting the flow.

[0046] At this time, particularly in the case of a horizontal branch as in this embodiment, some of the chips of the fluid pipe 1 generated during drilling enter the neck portion 5d, but since the seal member 76a that seals the gap between the inner wall portion 75a and the neck portion 5d in the circumferential direction is provided on the outer periphery of the inner wall portion 75a on the fluid pipe 1 side of the recessed portion 5i, the chips can be prevented from entering through the gap between the inner wall portion 75a and the neck portion 5d toward the recessed portion 5i. The chips that enter the neck portion 5d accumulate or adhere to the inner surface of the inner wall portion 75a that covers the recessed portion 5i. In addition, since the seal member 76b as a sealant is provided on the outer periphery of the inner wall portion 75a on the opposite side of the recessed portion 5i from the fluid pipe 1 side, the seal member 76b can seal not only during drilling but also during the retraction operation of the inner wall portion 75a after drilling, and drilling can be performed in an uninterrupted flow state.

[0047] Furthermore, a protrusion 75d that protrudes toward the inner diameter is formed at the tip of the inner wall portion 75a, so that chips that have accumulated or adhered to the inner surface of the inner wall portion 75a can be retained on the inner surface of the inner wall portion 75a without falling onto the inner surfaces 5h, 5j and recessed portions 5i of the neck portion 5d, not only when drilling but also when removing the mounting flange tube 71 from the neck portion 5d after drilling.

[0048] In this embodiment, the tip surface 75e of the inner wall portion 75a is formed flat, and a portion of this tip surface 75e contacts a step portion 5k that is curved circumferentially on the base end side within the neck portion 5d of the housing 5, and the above-mentioned inner bottom portion 75c contacts the open end portion 5c, thereby completing the insertion of the inner wall portion 75a.

[0049] In addition, at this time, for example, a female screw hole 5p is formed on the fluid pipe 1 side of the recessed portion 5i of the housing 5, that is, on the base end side of the neck portion 5d, as an outlet communicating with the inside and outside of the housing 5. A ball valve (not shown) that is provided so as to be able to open and close this female screw hole 5p is installed to discharge chips generated during drilling together with the fluid to the outside. In this way, the chips generated during drilling can be discharged to the outside via the female screw hole 5p formed on the base end side of the neck portion 5d, which is upstream of the recessed portion 5i, without approaching the recessed portion 5i. The ball valve described above is removed in an uninterrupted flow state after drilling, and is replaced with an opening and closing bolt 5n as shown in FIG. 10 for sealing.

[0050] The chip discharge port is not limited to the above, and for example, as shown in FIG. 7 as a modified example of this embodiment, a communication port 75p communicating with the female screw hole 5p may be formed in the inner wall portion 75a. In this way, chips that have entered the neck portion 5d are discharged through the communication port 75p and the female screw hole 5p. In addition, the tip surface 75f of the inner wall portion 75a in this modified example is curved so as to follow the step portion 5k curved in the circumferential direction on the base end side of the neck portion 5d, that is, the tip surface 75f is in contact with the step portion 5k over the entire circumference. In this way, the inner wall portion 75a is stably positioned at a position where it closes the recessed portion 5i.

[0051] 6, when the fluid pipe 1 is cut by the cutter 72, the cut piece 1a cut from the fluid pipe 1 is held in the hole saw 72a. The cutter 72 is then pulled into the mounting flange tube 71 together with the cut piece 1a, and the inner wall portion 75a is further pulled back from the recessed portion 5i to close the inside of the housing 5 with the working valve body 31 of the working valve 3, thereby completing the drilling operation of the fluid pipe 1. As described above, by closing the opening of the recessed portion 5i in the neck portion 5d of the housing 5 with the inner wall portion 75a, it is possible to prevent cuttings generated by drilling the fluid pipe 1 in the housing 5 from entering the recessed portion 5i, and therefore the working valve body 31 can be brought into contact with the clean recessed portion 5i with the inner wall portion 75a open, and the housing 5 can be sealed. At this time, the mounting position of the drilling machine 7 is close to the fluid pipe 1, and the drilling work is performed by inserting and fitting the inner wall part 75a of the mounting flange tube 71 and the inner peripheral surface 5h, 5j of the neck part 5d, so that the drilling machine 7 is positioned as concentrically as possible with respect to the housing 5, and even if there is a deviation in the parallelism of the connecting surface between the mounting flange of the drilling machine 7 body and the mounting flange tube 71, the effect on the drilling part is minimized and drilling deviation is suppressed. In particular, by fitting the recessed part 5i, the width of the working valve body 31 is made thin, which reduces costs and reduces the distance of the drilling machine 7 from the fluid pipe 1, minimizing the misalignment of the drilling and suppressing disturbance of the flow path, and this drilling can form a hole part 1b that can perform ideal fluid control by drilling without misalignment even when inserting the plug body 11 (valve body) of the control valve 10 described later.

[0052] Next, the drilling machine 7 is removed while the inside of the housing 5 is hermetically closed by the working valve body 31 of the working valve 3. It is preferable to replace the drilling machine 7 with an exhauster (not shown) for exhausting chips generated during drilling, which is connected to the open end 5c of the neck 5d, and to exhaust chips remaining inside the housing 5 and the fluid pipe 1 to the outside by the exhauster. Although not particularly shown, the exhauster may be, for example, one that is composed of a cylindrical part having one end that opens movably inside the housing 5 and the other end that communicates with the outside of the housing 5, and an opening / closing valve that can open and close the inside of the cylindrical part.

[0053] Next, with the inside of the housing 5 blocked by the working valve body 31 of the working valve 3, the discharger is removed, and in place of this discharger, a flow control valve 10 for controlling the fluid in the pipe is connected to the open end 5c of the neck 5d.

[0054] 8, the flow control valve 10 is mainly composed of a plug 11 (valve element) that passes through a bored hole 1b of the fluid pipe 1 and moves horizontally to open and close the inside of the pipe, and a valve housing 12 that accommodates the plug 11 so that it can move horizontally and has a peripheral side part 13 with an open tip. The valve housing 12 is equipped with a shaft member 14 that extends horizontally while being rotatable and pivoted so as not to be able to move back and forth, and the plug 11 is screwed into this shaft member 14. By rotating an operating part 14a at the end of the shaft member 14 that protrudes outward from the valve housing 12, the plug 11 can move in the axial direction of the shaft member 14 relative to the valve housing 12.

[0055] More specifically, the plug 11 is mainly composed of a female screw piece 11a with a female screw that is screwed onto the shaft member 14, a core portion 11b that engages with the female screw piece 11a and moves in accordance with it, and a plug portion 11c made of an elastic material that covers the entire outer surface of the core portion 11b. The plug 11 moves into the fluid pipe 1 through the hole 1b of the fluid pipe 1 as the shaft member 14 rotates, and the plug portion 11c comes into close contact with the hole 1b and the inner circumferential surface 1c of the fluid pipe 1 over the entire circumference, thereby completely blocking the flow path in the pipe, or partially blocking the flow path in the pipe depending on the amount of movement of the plug portion 11c, thereby enabling the flow rate to be controlled.

[0056] Furthermore, the valve housing 12 of the flow control valve 10 has an air vent hole 13a formed at its end side, which penetrates upward through the circumferential side portion 13 and has a female thread portion into which an open-close plug 15 that is normally closed is screwed, and two recesses 13b, 13b are formed horizontally spaced apart along the entire circumference on the outer circumferential surface at the tip side of the circumferential side portion 13, and sealing members 21, 22 are provided in each recess 13b. In the following description, the tip side of the valve housing 12 will be referred to as the first sealing member 21, and the base side of this first sealing member 21 will be referred to as the second sealing member 22.

[0057] As shown in Fig. 8, the first sealing member 21 and the second sealing member 22 of this embodiment are made of an elastic material integrally formed into an annular shape, and have the same shape. The first sealing member 21 is composed of a retaining portion 21a on the base end side that is retained in the recess 13b, and a deforming portion 21b that is connected to the retaining portion 21a and allows elastic deformation, and in the natural state before elastic deformation, these sealing members 21 and 22 are formed so that the outermost diameter of the deforming portion 21b is larger than the inner diameter of the neck portion 5d. Note that the second sealing member 22 has the same shape as the first sealing member 21 described above, so a description thereof will be omitted.

[0058] Furthermore, the horizontal separation distance between the first sealing member 21 and the second sealing member 22 is configured to be larger than the horizontal opening width of the opening 5b of the neck portion 5d.

[0059] Next, the installation process of the flow control valve 10 will be described. First, instead of the pressing portion 80 described above, a pair of hydraulic rods 60 are erected in the vertical direction on the support portions 36, 36 of the working valve 3 as an insertion means for inserting the flow control valve 10 into the housing 5. The hydraulic rod 60 is mainly composed of a support plate 61 connected to the support portion 36 of the working valve 3, a cylinder 62 with an internal structure fixed and supported by the support plate 61, and a piston 63 with one end inserted into the cylinder 62. The hydraulic rod 60 can be extended and retracted while pressing the piston 63 horizontally by the hydraulic pressure by supplying hydraulic fluid such as oil by a supply pump or the like to the inside of the cylinder 62 through hydraulic fluid hoses (not shown) connected to supply ports 62a, 62a. The pair of hydraulic rods 60, 60 are configured so that the pistons 63, 63 extend and retract in a synchronous manner, and the upper ends of the pistons 63 are always located at the same position.

[0060] 8, the pistons 63, 63 of the hydraulic rod 60 are extended, and a pressing member 64 for pressing the flow control valve 10 is installed on the tip of these pistons and fastened with a nut 65. Furthermore, the peripheral edge of the end of the valve housing 12 of the flow control valve 10 is fitted into a fitting portion 64a formed through the pressing member 64 at approximately the center, and the pistons 63, 63 are operated toward the fluid pipe 1 by hydraulic pressure, so that a pressing force is applied to the flow control valve 10 toward the fluid pipe 1 via a pressing surface 64b, which is the bottom surface of the pressing member 64, and the flow control valve 10 is gradually moved toward the fluid pipe 1 within the neck portion 5d.

[0061] The flow control valve 10 inserted into the neck 5d by the hydraulic rod 60 is kept sealed by at least the sealing member 21 being in close contact with the inner circumferential surface 5h of the neck 5d that is located outside the opening 5b. In this sealed state, the working valve body 31 of the working valve 3 is opened.

[0062] When the flow control valve 10 moves toward the fluid pipe 1, the first sealing member 21 that had been sealing the inner circumferential surface 5h of the neck 5d passes through the opening 5b and is separated from the inner circumferential surface 5h of the neck 5d, temporarily losing its ability to maintain a sealed state, but at this time the second sealing member 22 on the base end side seals the inner circumferential surface 5h of the neck 5d. In other words, the first sealing member 21 and the second sealing member 22 that are separated horizontally maintain a sealed state at all times until the flow control valve 10 is installed, making it possible to prevent fluid leakage.

[0063] The flow control valve 10 is pressed to an installation position where the first sealing member 21 is inwardly beyond the opening 5b (toward the fluid pipe 1) and in close contact with the inner circumferential surface 5j of the neck 5d, and the second sealing member 22 is in close contact with the inner circumferential surface 5h on the outer side of the opening 5b (see Figs. 9 and 10). At this installation position, the hooks 13e, 13e that protrude from the outer diameter side of the circumferential part 13 of the valve housing 12 and extend further inwardly are fitted into the notch 5f as an engagement part formed in the open end 5c of the neck 5d of the housing 5, and the flow control valve 10 can be restricted from moving in the circumferential direction relative to the housing 5, so that the risk of the flow control valve 10 moving due to the flow of the fluid in the pipe can be avoided.

[0064] Next, as shown in Figures 9 and 10, the flange portion 5e of the open end 5c of the housing 5 and the protrusion portion 13d of the flow control valve 10 overlapping therewith are engaged with a fitting member 19 having a split structure formed in an approximately U-shape in cross section, thereby preventing the flow control valve 10 from slipping outward from the housing 5.

[0065] Furthermore, with the flow control valve 10 in its installed position, the open / close plug 15 is screwed out to open the air vent hole 13a, thereby discharging air remaining within the valve housing 12 of the flow control valve 10 in its sealed state to the outside.

[0066] After the flow control valve 10 is installed as described above, as shown in Figures 9 and 10, the pressing member 64 and hydraulic rod 60 attached to the flow control valve 10 are removed, and the working valve 3 attached to the opening 5b of the housing 5 is removed in sequence. At this time, the first sealing member 21 seals the inner circumferential surface 5j below the opening 5b of the neck 5d, so that leakage of the internal fluid is prevented even if the opening 5b is opened. Therefore, the working valve 3 can be removed without sealing with the plug 11, and there is no risk of the working valve 3 deteriorating. As shown in Figure 9, a blocking lid 9 is attached in a sealed manner to the opening 5b after the working valve 3 has been removed. EXAMPLES

[0067] Next, a pipe drilling device and its installation method according to a second embodiment will be described with reference to Figs. 11 to 17. The same components as those in the above-mentioned embodiment will be denoted by the same reference numerals and will not be described again. The installation state of the pipeline will be the same as that in the above-mentioned embodiment. As shown in Fig. 12, the pipe drilling device according to the present invention is mainly composed of a housing 105 that fits an existing fluid pipe 101, an operating valve 103 that opens and closes the inside of the housing 105, and a drilling machine 107 that drills the fluid pipe 101 in the housing 105. In this embodiment, as the pipe drilling device and its installation method, a series of steps will be described from drilling a predetermined position of the existing fluid pipe 101, which is a pipeline component, in the housing 105 under an uninterrupted flow state until a flow control valve 110 is installed in the housing 105.

[0068] The fluid pipe 101 of this embodiment is a ductile cast iron pipe, and as shown in FIG. 11(a), is formed as a straight pipe having a generally circular cross section.

[0069] 11, after cleaning the outer surface of a fluid pipe 101 which is to be the mounting portion of the fluid control device according to the present invention, a housing 105 constituting the pipe punching device is hermetically fitted onto the fluid pipe 101 via a seal member 104 for sealing a punching portion of the fluid pipe 101 which will be described later. The housing 105 has a divided structure consisting of a plurality of divided bodies, and in this embodiment, it is mainly composed of a first divided body 151 which constitutes one side and a second divided body 152 which constitutes the other side, which are fastened together by a fastening member 102.

[0070] The first division 151 of the housing 105 is composed of a conduit housing section 105a extending in the conduit direction along the fluid pipe 101, and a cylindrical neck section 105d branching off and extending horizontally approximately at the center of the conduit housing section 105a, having an open end 105c opening in the branching direction, and an opening section 105b opening to the side, and is formed in an approximately T-shape when viewed from above.

[0071] Furthermore, the open end 105c of the neck portion 105d has a pair of flange portions 105e protruding radially outward toward the pipeline direction of the fluid pipe 101, and a plurality of push bolts 105f configured to be insertable into a plurality of through holes formed along the circumferential direction of this flange portion 105e.

[0072] The neck 105d is provided on its cylindrical circumferential side with a thick pipe portion 105g whose outer surface protrudes in the radial direction, and the thick pipe portion 105g has an opening 105b that opens toward one side in the pipe direction of the fluid pipe 1. As shown in Fig. 11, the opening 105b opens in a vertically elongated, approximately rectangular shape in side view, and is formed so that an operating valve body 131 of the operating valve 103 can be inserted therethrough, as described below.

[0073] As shown in FIG. 11(a), the inner periphery of the neck 105d includes an inner periphery 105h formed into a curved surface that is generally circular when viewed from the side, a recessed portion 105i serving as a concave valve seat recessed in the outer diameter direction along the circumferential direction at the same position as the opening 105b in the axial direction of the neck 105d, an inner periphery 105j formed on the base end side of the neck 105d relative to the recessed portion 105i and formed with a slightly smaller diameter than the inner periphery 105h on the tip side of the neck 105d, and a step portion 105k connected to the base end side of the inner periphery 105j and protruding in the inner diameter direction.

[0074] As shown in FIGS. 11(a) and (b), a communication opening 117 is formed at the base end of the neck portion 105d as a discharge port that penetrates the neck portion 105d from the inside to the outside.

[0075] 11 and 12, an operating valve 103 constituting a pipe punching device according to the present invention is hermetically connected to the opening 105b of the neck 105d. The operating valve 103 is mainly composed of an operating valve body 131 that slides openably and closably within the housing 105, and a housing member 132 as a working valve housing having a housing interior 132a that houses the operating valve body 131 so that it can slide horizontally, and an opening portion 132b whose one lateral end is open.

[0076] The accommodating member 132 is pivotally supported so as to be rotatable and unable to move back and forth, and is provided with an axis member 134 extending horizontally, with the operating valve body 131 screwed into this axis member 134. By rotating an operating member 135 attached to the tip of the axis member 134 protruding outward from the accommodating member 132, the operating valve body 131 is configured to be slidable relative to the accommodating member 132.

[0077] In addition, an endless seal member 131a is provided or covered along the edges of both sides of the working valve body 131, and the peripheral portion of this seal member 131a is configured to be able to hermetically close the inside of the housing 105 by abutting the surface of the side wall 105r of the recessed portion 105i. In this way, by providing the recessed portion 105i as a recessed valve seat portion on the inner surface of the neck portion 105d, the peripheral portion of the working valve body 131 can be abutted against the side wall 105r of the recessed portion 105i by utilizing the pressure in the fluid pipe 101, so that the sealing performance can be improved. Furthermore, as described above, by abutting the peripheral portion of the working valve body 131 against the recessed portion 105i formed on the inner surface of the neck portion 105d, the working valve body 131 can be formed in a thin plate shape, so that the extension in the branching direction of the housing 105, i.e., the stroke of the drilling machine 107 can be configured to be short, and the drilling machine 107 can be prevented from being eccentric, and the drilling accuracy can be improved. Furthermore, by making the working valve body 131 thin, it is possible to reduce costs by making the working valve body 131 and the housing 105 smaller, and since the drilling accuracy is high, the plug body 111 of the control valve 110 described below can be inserted properly, improving watertightness and fluid controllability.

[0078] Regarding the detailed procedure for attaching the working valve 103, first, the containing member 132 is placed on the outer surface of the neck portion 105d at a position where the open portion 132b communicates with the opening portion 105b of the neck portion 105d.

[0079] Next, the housing member 132 is fastened to the neck portion 105d. In this embodiment, the housing member 132 is fastened by screwing a fastening member through a plurality of through holes formed so as to surround the open portion 132b of the housing member 132 and a plurality of female screw holes formed so as to surround the opening portion 105b of the neck portion 105d.

[0080] Furthermore, the housing member 132 is provided with a seal member 139 surrounding the periphery of the open portion 132b, and the seal member 139 is brought into close contact with the periphery of the opening 105b by fastening the fastening members described above, thereby sealing the opening 105b and the open portion 132b. In this manner, the operating valve 103 is provided at the opening 105b provided in the neck portion 105d, so that the mounting position of the drilling machine 107 described below can be brought as close as possible to the fluid pipe 101, and as a result, the extension stroke of the drilling machine 107 approaching the fluid pipe 101 can be shortened, and as a result, the drilling machine 107 can be made smaller, lighter, and less expensive (see Figs. 12 and 14).

[0081] Next, as shown in Fig. 12, a drilling machine 107 is connected in a sealed manner to the open end 105c of the neck 105d. The drilling machine 107 is mainly composed of a mounting flange tube 171, a cutter 172 for drilling holes in the fluid pipe 101, a drive motor 174 for rotating the cutter 172 inside the mounting flange tube 171, and an advance / retract mechanism 173 for moving the cutter 172 forward and backward in the horizontal direction. The cutter 172 is formed in a bottomed cylindrical shape with a smaller diameter than the fluid pipe 101, and is composed of a hole saw 172a with a cutting blade at its tip along the circumferential direction, and a center drill 172b arranged coaxially with the rotation axis of the hole saw 172a and protruding beyond the cutting blade.

[0082] In addition, a cylindrical body 178 that movably fits the cutter 172 is provided inside the mounting flange tube 171 so as to be movable in the horizontal direction relative to the mounting flange tube 171. The cylindrical body 178 is formed in a substantially cylindrical shape with an outer circumferential surface having a diameter slightly smaller than the inner circumferential surfaces 105h, 105j of the neck portion 105d, and the cylindrical body 178 is inserted into the neck portion 105d to a position covering the opening of the recessed portion 105i by pushing and pulling an operating portion 179 that is fixed to the base end side and extends outward from the mounting flange tube 171 in a sealed state. That is, the cylindrical body 178 provided in the drilling machine 107 constitutes the cylindrical portion of the present invention. The cylindrical body 178 is positioned at a predetermined position that covers the opening of the recessed portion 105i by fixing the operating portion 179 with a fixing screw 179a screwed into the mounting flange tube 171. The positioning is not limited to that by the fixing screw 179a, but may be, for example, a mechanism for pressing the head of the operating portion 179.

[0083] Furthermore, since the cylindrical body 178 is disposed slidably along the inner circumferential surfaces 105h, 105j of the neck portion 105d, the accuracy of the movement of the cylindrical body 178 is improved, and the recessed portion 105i can be reliably closed or opened.

[0084] Furthermore, the outer peripheral surface of the cylindrical body 178 is disposed adjacent to the inner peripheral surfaces 105h, 105j of the neck portion 105d, thereby preventing foreign matter from entering the recessed portion 105i.

[0085] The procedure for mounting the drill 107 will be described below. The flange portion 175 formed at the tip of the mounting flange tube 171 is hermetically fastened to the flange portion 105e of the open end portion 105c of the neck portion 105d by a plurality of fastening members 177 arranged in the circumferential direction.

[0086] Next, as shown in Figure 12, the drilling process of the fluid pipe 101 by the drilling machine 107 will be explained. First, the working valve body 131 of the working valve 103 is placed in the accommodating interior 132a of the accommodating member 132, and the inside of the housing 105 is opened. Then, the cutter 172 is rotated by the drive motor 174 of the drilling machine 107, and the cutter 172 is advanced forward by the advance / retract mechanism 173, so that the wall of the fluid pipe 101 is drilled without interrupting the flow.

[0087] At this time, particularly in the case of a horizontal branch as in this embodiment, some of the chips of the fluid pipe 101 generated during drilling enter the neck portion 105d, but since the opening of the recessed portion 105i is blocked by the cylindrical body 178, the chips can be prevented from entering the recessed portion 105i. The chips that enter the neck portion 105d accumulate or adhere to the inner surface of the cylindrical body 178 that covers the recessed portion 105i. At this time, for example, an elastic body may be bonded or vulcanized to the outer periphery of the cylindrical body 178 to eliminate gaps between the inner periphery surfaces 105h, 105j and the recessed portion 105i, or between only any of the respective portions.

[0088] Furthermore, a protrusion 178d that protrudes toward the inner diameter side is formed at the tip of the cylindrical body 178, so that chips that have accumulated or adhered to the inner surface of the cylindrical body 178 can be retained on the inner surface of the cylindrical body 178 without falling onto the inner surfaces 105h, 105j and recessed portion 105i of the neck portion 105d, not only when drilling but also when removing the mounting flange tube 171 and the cylindrical body 178 from the neck portion 105d after drilling.

[0089] In this embodiment, the tip surface 178e of the cylindrical body 178 is formed flat, and the insertion of the cylindrical body 178 is completed when this tip surface 178e comes into contact with a step portion 105k formed in the neck portion 105d of the housing 105.

[0090] At this time, for example, by opening a ball valve 118 attached to a communication opening 117 formed on the base end side of the neck portion 105d as a discharge port communicating with the inside and outside of the housing 105, chips generated during drilling can be discharged to the outside together with the fluid. In this way, the chips generated during drilling can be discharged to the outside via the communication opening 117 formed on the base end side of the neck portion 105d upstream of the recessed portion 105i without approaching the recessed portion 105i. As will be described later, this communication opening 117 is used as a bypass for filling with water when the flow control valve 110 is operated. After the work, the above-mentioned ball valve is removed in a state where the flow is not interrupted, and is sealed with an open / close plug 119 shown in FIG. 17.

[0091] When the fluid pipe 101 is cut by the cutter 172, the cut piece 101a separated from the fluid pipe 101 is held in the hole saw 172a. Then, as shown in FIG. 13, the cutter 172 is drawn into the inside of the mounting flange tube 171 together with the cut piece 101a, and the cylindrical body 178 is also drawn into the inside of the mounting flange tube 171, and the inside of the housing 105 is closed by the working valve body 131 of the working valve 103, thereby completing the drilling operation of the fluid pipe 101. As described above, by closing the opening of the recessed portion 105i in the neck portion 105d of the housing 105 with the cylindrical body 178, it is possible to prevent cuttings generated by drilling the fluid pipe 101 in the housing 105 from entering the recessed portion 105i, and therefore the working valve body 131 can be brought into contact with the clean recessed portion 105i with the cylindrical body 178 open, and the housing 105 can be sealed. In this case, since the mounting position of the drilling machine 107 is close to the fluid pipe 101, the drilling machine 107 is positioned as concentrically as possible with respect to the housing 105, and even if a deviation in the parallelism occurs between the mounting flange of the drilling machine 107 body and the connection surface of the mounting flange tube 171, the effect on the drilling portion is minimized and drilling deviation is suppressed.

[0092] Next, with the inside of the housing 105 hermetically closed by the working valve body 131 of the working valve 103, the drilling machine 107 is removed. In place of the drilling machine 107, it is preferable to connect a discharger (not shown) to the open end 105c of the neck 105d in order to discharge chips generated during drilling, and to use the discharger to discharge chips remaining inside the housing 105 and the fluid pipe 101 to the outside.

[0093] Next, with the inside of the housing 105 blocked by the working valve body 131 of the working valve 103, the discharger is removed, and in place of this discharger, a flow control valve 110 for controlling the fluid in the pipe is connected to the open end 105c of the neck 105d.

[0094] Prior to mounting the flow control valve 110, as shown in Fig. 14, a flange portion 116a formed at the tip of a housing tube 116 housing the flow control valve 110 so as to be movable in the horizontal direction is hermetically connected to the open end 105c of the neck portion 105d by a plurality of fastening members 116d in the circumferential direction. The housing tube 116 is formed in a bottomed cylindrical shape with its tip open and its base end closed by a closing lid 116b having a through hole in the center. A communication opening 127 that communicates between the inside and outside of the housing tube 116 is formed in the closing lid 116b, and a ball valve 128 is normally screwed into this communication opening 127.

[0095] An insertion machine 160 is provided inside the housing tube 116 as an insertion means for inserting the flow control valve 110 into the housing 105. The insertion machine 160 is attached so as to be movable and detachable in the horizontal direction from the outside of the housing tube 116. The insertion machine 160 extends so as to penetrate horizontally through the center of the base end of the housing tube 116, and is mainly composed of an extension rod 161, an operating rod 162, and an insertion tube 163 in that order from the center.

[0096] 14 and 15(a), the extension rod 161 has a tip that is screwed into the mounting jig 126 attached to the base end of the valve housing 112 of the flow control valve 110, and its base end extends outward beyond the housing tube 116. An operating rod 162 that fits onto the extension rod 161 is pivotally supported rotatably but immovably in the axial direction relative to a tube portion 116c that constitutes the housing tube 116 and covers the through hole of the closure lid 116b, and is provided at its base end with a grip portion 162a for rotational operation. Furthermore, the insertion tube 163 that fits around this operating rod 162 is pivoted relative to the tube portion 116c so as to be non-rotatable but movable in the axial direction, and its tip portion 163a is horizontally clamped between the mounting jig 126 and the flange portion 161a of the extension rod 161, and is provided with a female thread portion 163b that screws into the male thread portion 162b of the operating rod 162.

[0097] Further, a through hole 163c having a substantially square shape in a side cross-sectional view is formed in the tip 163a of the insertion tube 163, and a tip 126a of the mounting jig 126 protruding in a substantially square shape in a side view so as to complement the through hole 163c is fitted into the through hole 163c. In this manner, the flow control valve 110 to which the mounting jig 126 is attached is restricted from moving in the circumferential direction relative to the insertion tube 163. Note that the side view shape of the through hole 163c of the insertion tube 163 and the tip 126a of the mounting jig 126 that complements it is not limited to a substantially square shape, and may be any non-circular shape such as a rectangular shape, an elliptical shape, or an oval shape.

[0098] 14, the flow control valve 110 is mainly composed of a plug 111 (valve body) that passes through a perforated hole 101b of the fluid pipe 101 and moves horizontally to open and close the inside of the pipe, and a valve housing 112 that accommodates the plug 111 so as to be movable horizontally and has a peripheral side part 113 with an open tip. The valve housing 112 is provided with a shaft member 114 that extends horizontally while being rotatable and pivoted so as not to be able to move back and forth, and the plug 111 is screwed into this shaft member 114. By rotating an operation part 114a at the base end of the shaft member 114 that protrudes outward from the valve housing 112, the plug 111 can be moved horizontally relative to the valve housing 112.

[0099] 16 and 17, the plug 111 is mainly composed of a female screw piece 111a having a female screw threaded on an axial member 114, a plug body portion 111b made of an elastic material, a plug body 111c that engages with the female screw piece 111a and moves in accordance with it, and a fastening member 115 that consists of a bolt and nut integrally molded with the plug body portion 111b by vulcanization or the like and connects the plug body portion 111b to the plug body 111c. The plug 111 moves into the pipe through the hole 101b of the distal fluid pipe 101 by the rotation of the axial member 114, and the plug body portion 111b comes into close contact with the hole 101b and the inner circumferential surface 101c of the fluid pipe 101 over the entire circumference, completely blocking the flow path in the pipe, or partially blocking the flow path in the pipe depending on the amount of movement of the plug body 111c, thereby enabling the flow rate to be controlled. Furthermore, the female thread piece 111a initially moves simultaneously with the plug body portion 111b and the plug body 111c, but when the plug body portion 111b comes into contact with the bottom of the inner circumference of the pipe, the female thread piece 111a moves significantly relative to the plug body portion 111b and the plug body 111c, and the wing portions on both sides of the female thread piece 111a push the plug body portion 111b outwardly and expand it, helping to stop the water.

[0100] Furthermore, in the valve housing 112 of the flow control valve 110, a recess 113b is formed over the entire periphery on the outer circumferential surface at the tip side of the peripheral side portion 113, and a sealing member 121 is provided in this recess 113b.

[0101] Next, the installation process of the flow control valve 110 will be described. First, as shown in Fig. 14, in a state where the storage cylinder 116 storing the flow control valve 110 therein as described above is connected in a sealed manner to the open end 105c of the housing 105, before the working valve body 131 is opened, the communication opening 117 provided in the neck 105d of the housing 105 ahead of the working valve body 131 is communicated with the communication opening 127 provided in the blocking lid of the storage cylinder 116 on the base end side of the working valve body 131 by a connecting hose not shown. In this way, the fluid in the fluid pipe 101 is gradually introduced into the storage cylinder 116 by the fluid pressure through the communication opening (not shown), the connecting hose, and the communication opening 127.

[0102] In this way, by introducing the fluid in the fluid pipe 1 into the containing cylinder 116, the pressures in the containing cylinder 116 and the fluid pipe 1 can be adjusted to the same pressure before the working valve body 31 is opened.

[0103] Next, as shown in Fig. 14, the working valve body 131 is opened, and the flow control valve 110 in the receiving tube 116 is installed facing the housing 105. More specifically, by rotating the operating rod 162 of the insertion machine 160 in the normal direction, the insertion tube 163 screwed onto the operating rod 162 moves toward the fluid pipe 101. As the insertion tube 163 moves, a pressing force is applied to the flow control valve 110 via the mounting jig 126, and the flow control valve 110 moves gradually within the neck portion 105d. The extension rod 161 screwed onto the mounting jig 126 also moves downward following the flow control valve 110.

[0104] As shown in FIGS. 16 and 17, the flow restriction valve 110 is pressed to an installed position where the sealing member 121 extends beyond the opening 105b and comes into close contact with the inner circumferential surface 105j of the neck portion 105d.

[0105] After the flow control valve 110 is installed as described above, the insertion machine 160 is operated to remove the housing tube 116 that was attached to the flow control valve 110. More specifically, as shown in Figures 15(a) to (c), the extension rod 161 that is screwed into the mounting jig 126 is first rotated to remove it from the mounting jig 126. Next, the operating rod 162 is rotated in the reverse direction to move the insertion tube 163 that is screwed into the operating rod 162 toward the base end, thereby removing the tip 163a from the tip 126a of the mounting jig 126 that was fitted into the approximately square shape.

[0106] After operating the insertion machine 160 as described above and disconnecting it from the flow control valve 110, the fluid in the tube introduced into the holding tube 116 is discharged through a drain section not shown, and the holding tube 116 is removed from the housing 105 together with the insertion machine 160.

[0107] Furthermore, the working valve 103 attached to the opening 105b of the housing 105 is sequentially removed. At this time, the sealing member 121 seals the inner circumferential surface 105j ahead of the opening 105b of the neck portion 105d, so that even if the opening 105b is opened, leakage of the internal fluid is prevented. As shown in Fig. 16, a blocking lid 109 is detachably attached to hermetically close the periphery of the opening 105b after the working valve 103 is removed, and a blocking ring 140 formed in an annular shape is attached to the flange portion 105e of the neck portion 105d in the circumferential direction by a plurality of fastening members 141. EXAMPLES

[0108] Next, a pipe drilling device and its installation method according to a third embodiment will be described with reference to Figs. 18 to 23. The same components as those in the above-mentioned embodiment will be denoted by the same reference numerals and will not be described again. The installation state of the pipeline will be the same as that in the above-mentioned embodiment. As shown in Fig. 19, the pipe drilling device according to the present invention is mainly composed of a housing 205 that fits an existing fluid pipe 201, an operating valve 203 that opens and closes the inside of the housing 205, and a drilling machine 207 that drills the fluid pipe 201 in the housing 205. In this embodiment, as the pipe drilling device and its installation method, a series of steps will be described, from drilling a predetermined position of the existing fluid pipe 201, which is a pipeline component, in the housing 205 under an uninterrupted flow state, to installing a flow control valve 210 in the housing 205.

[0109] The fluid pipe 201 of this embodiment is a ductile cast iron pipe, and as shown in FIG. 18, is formed into a straight pipe having a generally circular cross section.

[0110] First, as shown in Fig. 19, the outer surface of a fluid pipe 201 to which the fluid control device according to the present invention is attached is cleaned, and then a housing 205 constituting a pipe punching device is fitted in a sealed state via a seal member 204 for sealing a punching portion of the fluid pipe 201, which will be described later. The housing 205 has a divided structure consisting of a plurality of divided bodies, and in this embodiment, it is mainly composed of a first divided body 251 constituting one side and a second divided body 252 constituting the other side, which are fastened by a fastening member 202, and the housing 205 is fitted in a sealed state around the fluid pipe 201 so as to be rotatable in the circumferential direction. As shown in Fig. 18, the gap between the first divided body 251 and the second divided body 252 is also sealed with a seal member.

[0111] The first division 251 of the housing 205 is composed of a conduit housing section 205a extending in the conduit direction along the fluid pipe 201, and a cylindrical neck section 205d branching off and extending horizontally approximately at the center of the conduit housing section 205a, having an open end 205c opening in the branching direction, and an opening section 205b opening to the side, and is formed in an approximately T-shape when viewed from above.

[0112] This neck portion 205d has an opening 205b on its cylindrical peripheral side that opens toward one side in the pipe direction of the fluid pipe 201. The opening 205b opens into a vertically elongated, generally rectangular shape in side view, and is formed so that an operating valve body 231 of the operating valve 203 can be inserted therethrough, as described below.

[0113] As shown in Figures 18 and 20(b), the inner periphery of the neck 205d is provided with an inner periphery 205h which is formed as a curved surface of an ellipse in a side view and which is linear in the horizontal direction, a recessed portion 205i which serves as a concave valve seat portion which is recessed in the outer diameter direction along the circumferential direction at the same position as the opening 205b in the axial direction of the neck 205d, an inner periphery 205j which is formed closer to the base end of the neck 205d than the recessed portion 205i and which is formed approximately flush with the inner periphery 205h on the tip side of the neck 205d, and a step portion 205k which is connected to the base end side of the inner periphery 205j and protrudes in the inner diameter direction.

[0114] Next, as shown in Figure 19, working valve 203 constituting the pipe punching device according to the present invention is hermetically connected to opening 205b of neck 205d. Working valve 203 has a configuration similar to that of Example 1 described above, and is mainly composed of working valve body 231 that slides openably and closably within housing 205, containing member 232 as a working valve housing that contains working valve body 231 so that it can slide horizontally, and mounting member 233 having an inner circumferential surface that can be fitted externally to neck 205d together with containing member 232.

[0115] The detailed configuration, installation procedure, features and effects of the operating valve 203 are similar to those of the operating valve 3 of the first embodiment described above, and therefore will not be described here.

[0116] Next, a drilling machine 207 is connected in a sealed manner to the open end of the neck 205d. The drilling machine 207 is mainly composed of a mounting flange tube 271, an end mill 272 as a cutter for drilling holes in the fluid pipe 201, a drive motor 274 for rotating the end mill 272 inside the mounting flange tube 271, and an advancing / retreating mechanism 273 for horizontally advancing and retracting the end mill 272 inside the flange tube 271. The end mill 272 in this embodiment is formed on a shaft having a smaller diameter than the fluid pipe 1, and is provided with a cutting blade on its tip and circumferential surface.

[0117] Prior to mounting the drilling machine 207, first, the pressing part 80 is mounted on the support parts 236, 236 of the working valve 203 as an insertion means for inserting the drilling machine 207 into the housing 205. The detailed configuration of the pressing part 80 and the mounting procedure are similar to those in the first embodiment described above, and therefore will not be described here.

[0118] The procedure for mounting the drill 207 will be described below. The mounting flange tube 271 of the drill 207 is inserted into the neck 205d by the pressing part 80, and the flange part 271a formed at the base end of the mounting flange tube 271 is brought into contact with the open end 205c of the neck 205d and fastened by the fastening member 279. The mounting flange tube 271 is formed in a substantially cylindrical shape with an outer circumferential surface slightly smaller in diameter than the inner circumferential surfaces 205h and 205j of the neck 205d, and is inserted into the neck 205d up to a position covering the opening of the recessed part 205i. That is, the mounting flange tube 271 provided in the drill 207 constitutes the cylindrical part of the present invention.

[0119] Furthermore, the mounting flange tube 271 is arranged to be slidable along the inner circumferential surfaces 205h, 205j of the neck portion 205d, thereby improving the accuracy of movement of the mounting flange tube 271 and enabling the recessed portion 205i to be reliably closed or opened.

[0120] Further, a seal member 276, which is a sealant of the present invention, is provided on the outer peripheral surface of the mounting flange tube 271, and this seal member 276 is in close contact with the inner peripheral surface 205h of the neck portion 205d, thereby sealing the mounting flange tube 271 of the drilling machine 207 and the neck portion 205d of the housing 205 in this connected state. Note that, as in the above-mentioned embodiment 1, a seal member may be provided to seal the inner peripheral surface 205j of the neck portion 205d.

[0121] Next, as shown in Figure 20, the drilling process of the fluid pipe 1 by the drilling machine 207 will be explained. First, with the working valve body 231 of the working valve 203 placed inside the housing member 232 and the inside of the housing 205 open, the end mill 272 is rotated by the drive motor 274 of the drilling machine 207, and the end mill 272 is advanced forward by the advance / retract mechanism 273, so that the wall of the fluid pipe 201 is drilled and penetrated without interruption of flow.

[0122] After the above-mentioned penetration, the housing 205 to which the drilling machine 207 is attached and which is fitted hermetically around the fluid pipe 201 is swung a predetermined angle α in the circumferential direction of the fluid pipe 201 while maintaining the hermetic state. In this manner, the end mill 272 swung in the circumferential direction following the swinging of the housing 205 to drill the fluid pipe 201, resulting in the formation of a hole 201b which extends longer in the circumferential direction of the fluid pipe 201 than in the axial direction of the fluid pipe 201.

[0123] At this time, particularly in the case of a horizontal branch as in this embodiment, some of the chips of the fluid pipe 201 generated during drilling will enter the neck portion 205d, but since the opening of the recessed portion 205i is blocked by the mounting flange tube 271, the chips can be prevented from entering the recessed portion 205i. The chips that enter the neck portion 205d will accumulate or adhere to the inner surface of the mounting flange tube 271 that covers the recessed portion 205i.

[0124] In addition, a protrusion 271d that protrudes toward the inner diameter is formed at the tip of the mounting flange tube 271, which makes it possible to prevent chips that have accumulated or adhered to the inner surface of the mounting flange tube 271 from falling onto the inner surfaces 205h, 205j and recessed portions 205i of the neck portion 205d not only when drilling but also when removing the mounting flange tube 271 from the neck portion 205d after drilling.

[0125] In addition, at this time, for example, a female screw hole 205p is formed on the fluid pipe 201 side of the recessed portion 205i of the housing 205, that is, on the base end side of the neck portion 205d, as an outlet communicating with the inside and outside of the housing 205. A ball valve (not shown) that is provided so as to be able to open and close this female screw hole 205p is installed to discharge chips generated during drilling together with the fluid to the outside. In this way, the chips generated during drilling can be discharged to the outside via the female screw hole 205p formed on the base end side of the neck portion 205d, which is upstream of the recessed portion 205i, without approaching the recessed portion 205i. The ball valve described above is removed in an uninterrupted flow state after drilling, and is sealed with a plug (not shown). The mounting flange tube 271 may have a curved tip surface as shown in FIG. 7, and may have a communication port that communicates with the chip discharge port.

[0126] 21, after the fluid pipe 201 is drilled by the end mill 272, the end mill 272 is drawn into the mounting flange tube 271, and the mounting flange tube 271 is further pulled back rearward from the recessed portion 205i, and the inside of the housing 205 is blocked by the working valve body 231 of the working valve 203, thereby completing the drilling operation of the fluid pipe 201. As described above, by blocking the opening of the recessed portion 205i in the neck portion 205d of the housing 205 with the mounting flange tube 271, it is possible to prevent chips generated by drilling the fluid pipe 201 in the housing 205 from entering the recessed portion 205i, and therefore the working valve body 231 can be brought into contact with the clean recessed portion 205i with the mounting flange tube 271 opened, and the housing 205 can be sealed.

[0127] Next, the drilling machine 207 is removed while the inside of the housing 205 is hermetically closed by the working valve body 231 of the working valve 203. It is preferable to replace the drilling machine 207 with an exhaust machine (not shown) for exhausting chips generated during drilling, which is connected to the open end 205c of the neck 205d, and to exhaust the chips remaining inside the housing 205 and the fluid pipe 201 to the outside by the exhaust machine.

[0128] Next, with the inside of the housing 205 blocked by the working valve body 231 of the working valve 203, the discharger is removed, and in place of this discharger, a flow control valve 210 for controlling the fluid in the pipe is connected to the open end 205c of the neck 205d.

[0129] 22 and 23, the flow control valve 210 is mainly composed of a plug 211 (valve body) that passes through a bored hole 201b of the fluid pipe 1 and moves horizontally to open and close the inside of the pipe, and a valve housing 212 that accommodates the plug 211 so as to be movable horizontally and has a peripheral side part 213 with an open tip. The valve housing 212 is equipped with a shaft member 14 that extends horizontally while being rotatable and pivotally supported so as not to be able to advance or retreat, and the plug 211 is screwed into the shaft member 14. By rotating an operation part at the end of the shaft member 14 that protrudes outward from the valve housing 212, the plug 211 is configured to be movable in the axial direction of the shaft member 14 relative to the valve housing 212.

[0130] The detailed configuration and installation process of the flow control valve 210 are similar to the installation process of the flow control valve 10 of the first embodiment, and therefore the explanation will be omitted.

[0131] As shown in Figures 22 and 23, the flow control valve 210 is pressed to an installation position where the first sealing member 21 is inward (toward the fluid pipe 1) beyond the opening 205b and in close contact with the inner surface 205j of the neck 205d, and the second sealing member 22 is in close contact with the inner surface 205h outward from the opening 205b.

[0132] The open end 205c of the housing 205 and the overhanging portion 213d of the flow control valve 210 overlapping therewith are fitted with a fastening member 219, so that the flow control valve 210 is restricted from slipping outward from the housing 205.

[0133] Next, the pipe punching device and the installation method thereof according to Modifications 1 to 7 of the present invention will be described with reference to Figures 24 to 32. Note that the same configurations as those in the above-mentioned embodiment will be given the same reference numerals and duplicated explanations will be omitted. Also, the installation conditions of the pipelines are the same as those in the above-mentioned embodiment. Also, these modifications will be described as modifications of the aspect of the second embodiment, but are not limited thereto, and these modifications may be applied to the first and third embodiments, or may be applied in multiple ways, for example by combining the mechanisms of both modifications 1 and 2.

[0134] First, the pipe punching device and its installation method according to the first modification will be described with reference to Figures 24 and 25. As shown in Figure 24, a cylindrical body 188 for movably fitting the cutter 172 is provided inside the mounting flange tube 171 so as to be movable horizontally relative to the mounting flange tube 171, and is inserted into the neck portion 105d to a position covering the opening of the recessed portion 105i. That is, the cylindrical body 188 constitutes the cylindrical portion of the present invention.

[0135] This tubular body 188 is formed in a bottomed cylindrical shape having an outer peripheral surface whose diameter is slightly smaller than the inner peripheral surfaces 105h, 105j of the neck portion 105d, and this tubular body 188 has a protrusion 181 and a rubber member 182 as an engagement portion that protrude from the inner peripheral surface on the base end side toward the inner diameter side, and is engaged with the outer peripheral surface of the cutter 172 in a manner that allows it to be connected or released.

[0136] More specifically, an elastically deformable rubber member 182 is provided at the tip of the inner diameter side of the protruding portion 181, and this rubber member 182 is pressed between the outer circumferential surface of the cutter 172, thereby connecting the cylindrical body 188 to the cutter 172. Therefore, when the cutter 172 advances in the horizontal direction by the advancing / retracting mechanism 173, the cylindrical body 188 advances toward the fluid pipe 101, following the cutter 172.

[0137] As shown in the upper part of FIG. 25, the axial tip surface of the cylindrical body 188, which has advanced following the cutter 172, comes into contact with a step 105k formed in the neck portion 105d of the housing 105, thereby completing the insertion of the cylindrical body 188.

[0138] 25, when the cutter 172 is pressed horizontally by the advance / retract mechanism 173, the connection between the cutter 172 and the cylindrical body 188 is released, and the cutter 172 advances horizontally by itself to perforate and cut the fluid pipe 101. Cutting chips generated during this perforation are prevented by the cylindrical body 188 from entering the recessed portion 105i.

[0139] Instead of rubber member 182 provided at the tip of protrusion 181, a recess may be formed on the outer peripheral surface of cutter 172, and a convex portion at the tip of the inner diameter side of protrusion 181 may be configured to fit into the recess and protrusion, or a ball plunger may be provided at the tip of the inner diameter side of protrusion 181, and the ball plunger may be configured to press against the outer peripheral surface of cutter 172 to engage with it.

[0140] Furthermore, as shown in FIG. 24, when the fluid pipe 101 is cut by the cutter 172 and the cutter 172 is retracted together with the piece 101a into the interior of the mounting flange tube 171, the cutter 172 and the tubular body 188 are again connected to each other, and the base end face of the cutter 172 abuts against the inner bottom surface 188a of the tubular body 188, so that the tubular body 188 retreats into the interior of the mounting flange tube 171 following the cutter 172.

[0141] In this way, the cutter 172 and the cylindrical body 188 can be easily connected or disconnected by simply moving the cutter 172.

[0142] Next, a pipe punching device and an installation method thereof according to the second modification will be described with reference to Figures 26 and 27. As shown in Figure 26, a cylindrical body 178 for movably fitting a cutter 172 is provided inside a mounting flange tube 171 so as to be movable horizontally relative to the mounting flange tube 171, and the cylindrical body 178 is inserted into the neck portion 105d to a position covering the opening of the recessed portion 105i by pushing and pulling an operating portion 179 fixed to the base end side and extending outward from the mounting flange tube 171 in a sealed state. That is, the cylindrical body 178 constitutes the cylindrical portion of the present invention.

[0143] The cylindrical body 178 is provided with a sweeping portion 190 around its entire circumference, which is made up of numerous hair-like members 191, 191, ... that are raised from the outer peripheral surface at the tip side toward the outer diameter side. The sweeping portion 190 is configured to enter the inside of the recessed portion 105i or to exit from the inside of the recessed portion 105i as the cylindrical body 178 moves forward and backward. The sweeping portion 190 may be provided on the entire outer peripheral surface of the cylindrical body 178, or may be provided on a part of it.

[0144] The bristle members 191 constituting the sweeping portion 190 are made of a material such as metal, resin, or fiber, and have the function of sweeping out foreign matter such as chips within the recessed portion 105i to the outside, like a broom or brush.

[0145] 26 and 27, the axial tip surface of the cylindrical body 178 inserted into the neck portion 105d by the operating portion 179 comes into contact with a step portion 105k formed in the neck portion 105d of the housing 105, thereby completing the insertion of the cylindrical body 178. At this insertion completion position, the sweeping portion 190 is inserted into the recessed portion 105i. This makes it possible to prevent foreign matter such as chips from entering the recessed portion 105i.

[0146] Furthermore, when the fluid pipe 101 is cut by the cutter 172 and the cutter 172 is retracted together with the cut piece into the inside of the mounting flange tube 171, and the cylindrical body 178 is also retracted into the inside of the mounting flange tube 171, the sweeping portion 190 operates to sweep outward from the inside of the recessed portion 105i. In this manner, even if foreign matter such as cutting chips enters the recessed portion 105i, the foreign matter can be discharged to the outside of the recessed portion 105i.

[0147] Next, a pipe drilling device and an installation method thereof according to Modification 3 will be described with reference to Figure 28. As shown in Figure 28, a cutter 372 is provided inside the mounting flange tube 171 so as to be movable horizontally relative to the mounting flange tube 171. This cutter 372 is formed in a bottomed cylindrical shape with a smaller diameter than the fluid pipe 101, and is composed of a hole saw 372a with a cutting blade along the circumferential direction at its tip, and a center drill 372b arranged coaxially with the rotation axis of the hole saw 372a and protruding beyond the cutting blade. By operating the advance / retract mechanism 173 connected to the base end side of the hole saw 372a, it is possible to insert the hole saw 372a into the neck portion 105d to a position where it covers the opening of the recessed portion 105i. In other words, the hole saw 372a constitutes a part of the cutter 372 of the present invention, and also constitutes the cylindrical portion of the present invention. In this way, by using the hole saw 372a, which is a part of the cutter 372, the structure of the cylindrical portion can be simplified.

[0148] The hole saw 372a is provided with a sweeping portion 390 around its entire circumference, which is made up of numerous bristle-like members 391, 391, ... that are raised from the outer periphery of the base end toward the outer diameter side. The sweeping portion 390 is configured to advance into the recessed portion 105i or advance out from the recessed portion 105i as the hole saw 372a moves back and forth. The sweeping portion 390 may be provided on the entire outer periphery of the hole saw 372a, or may be provided on a part of it.

[0149] The bristle members 391 constituting the sweeping portion 390 are made of a material such as metal, resin, or fiber, and have the function of sweeping out foreign matter such as chips in the recessed portion 105i to the outside like a broom or brush.

[0150] 28, the sweeping part 390 is inserted into the recessed part 105i at a position where the cutting blade at the axial tip of the hole saw 372a, which is inserted into the neck part 105d by the advancing / retracting mechanism 173, comes into contact with the outer surface of the fluid pipe 101 to drill a hole. In this way, foreign matter such as cutting chips can be prevented from entering the recessed part 105i.

[0151] Furthermore, as the hole saw 372a rotates when the cutter 372 is drilling, the sweeping portion 390 inserted into the recessed portion 105i rotates in the circumferential direction, thereby increasing the fluidity within the recessed portion 105i and preventing the intrusion of foreign matter such as chips.

[0152] Furthermore, when the fluid pipe 101 is cut by the cutter 372 and the cutter 372 is retracted together with the cut piece 101a into the inside of the mounting flange tube 171, the sweeping portion 390 operates to sweep outward from the inside of the recessed portion 105i. In this manner, even if foreign matter such as chips enters the recessed portion 105i, the foreign matter can be discharged to the outside of the recessed portion 105i.

[0153] Next, a pipe drilling device and its installation method according to the fourth modification will be described with reference to Figures 29 and 30. As shown in Figures 29 and 30, a suction pipe 280 made of a rod-shaped body with a small diameter for discharging chips is inserted in a sealed state into the neck 105d of the housing 105 through a through hole 105m formed in the housing 105 in a substantially horizontal direction, and the suction pipe 280 is disposed in a position where it covers the opening of the lower recess 105i from above in the vertical direction. That is, the suction pipe 280 constitutes the cylindrical portion of the present invention.

[0154] This suction tube 280 has a hollow structure in which a tip opening 281a located inside the neck 105d communicates with a rear end opening 281b located outside, and a valve 282 arranged outside the housing 105 allows both openings 281a, 281b of the suction tube 280, i.e., a communication passage connecting the inside and outside of the neck 105d, to be freely opened and closed.

[0155] 30, the suction pipe 280 inserted into the neck portion 105d covers the opening of the recessed portion 105i from above. In this way, it is possible to prevent foreign matter such as chips from entering the recessed portion 105i.

[0156] In addition, while the fluid pipe 101 is being cut by the cutter 172, or after the fluid pipe 101 has been cut and the cutter 172 has been retracted together with the cut piece 101a into the interior of the mounting flange tube 171, the valve 282 of the suction pipe 280 is opened, so that the cutting chips together with the fluid in the neck portion 105d are sucked in through the tip opening 281a of the suction pipe 280 and discharged outside the housing 105 through the rear opening 281b.

[0157] In this way, foreign matter such as chips in the housing 105 can be discharged to the outside by the suction pipe 280 that communicates with the inside and outside of the housing 105. In addition, by moving the suction pipe 280 in the neck portion 105d back and forth along the recessed portion 105i as appropriate while the valve 282 is open, the efficiency of suctioning chips can be improved. The number of suction pipes 280 is not limited to one, and a predetermined number may be provided. In addition, the suction pipe 280 may be removed, for example, while cutting the fluid pipe 101, and attached to the valve 282 after the cutting is completed, so that foreign matter such as chips can be discharged to the outside. It is preferable to remove the suction pipe 280 after this, but this is not limited thereto. When sealingly closing the working valve body 131 during the removal work of the drilling machine 107, foreign matter such as chips may be pushed out by the working valve body 131 while opening the valve 282 and the valve of the rear end opening 281b. Valve 282 can be removed after restrictor valve 110 is installed.

[0158] Next, a pipe punching device and an installation method thereof according to Modification 5 will be described with reference to Fig. 31. As shown in Fig. 31, recess 105p formed inside neck 105d of housing 105 has an inner surface on the fluid pipe 101 side formed as tapered surface 105t that gradually opens from the inner bottom surface toward the opening.

[0159] This increases the fluidity of the fluid in the recess 105i, so that chips that have entered or are about to enter the recess 105p together with the fluid when the fluid pipe 101 is cut can flow out of the recess 105p along the tapered surface 105t without remaining therein. The taper may be gradually opened from the opening toward the inner bottom surface to prevent chips from entering.

[0160] Next, a pipe punching device and an installation method thereof according to Modification 6 will be described with reference to Fig. 32. As shown in Fig. 32, a housing 105', a mounting flange tube 171' connected to this housing 105', and an advance / retract mechanism (not shown) are attached to the fluid pipe 101 with their outer ends inclined so as to face obliquely upward from the horizontal direction. That is, the inner surface of a recessed portion 105i' formed inside the housing 105' is inclined with respect to the vertical direction.

[0161] By doing so, the fluidity of the fluid within the recessed portion 105i' can be increased, so that chips that have entered or are attempting to enter the recessed portion 105i' along with the fluid when the fluid pipe 101 is cut can flow out of the recessed portion 105i' along the inner surface of the inclined recessed portion 105i' without remaining therein.

[0162] Although not shown, it is preferable to attach the housing 105 having the recessed portion 105p according to the above-mentioned modified example 5 to the fluid pipe 101 with the housing 105 inclined so as to face obliquely upward as in modified example 6. In this way, the tapered surface 105t constituting the recessed portion 105p is inclined more with respect to the vertical direction, that is, inclined so as to approach the horizontal direction, so that the fluidity of the fluid in the recessed portion 105p can be further increased and chips that try to enter the recessed portion 105p can be discharged without remaining behind.

[0163] Next, a pipe punching device and its installation method according to the seventh modification will be described with reference to Fig. 33. As shown in Fig. 33, an operating valve 103' constituting a pipe punching device according to the present invention is hermetically connected to an opening 105b of a neck 105d of a housing 105. The operating valve 103' is mainly composed of an operating valve body 131' that slides openably and closably within the housing 105, and a housing member 132' as a working valve housing that extends substantially vertically downward and has a housing interior 132a' that slidably houses the working valve body 131', and an opening 132b' whose upper end is open.

[0164] The accommodating member 132' is pivotally supported so as to be rotatable and unable to move back and forth, and is provided with an axis member 134' extending vertically downward, and an operating valve body 131' is screwed onto this axis member 134'. By rotating an operating member 135' attached to the tip of the axis member 134' protruding downward from the accommodating member 132', the operating valve body 131' is configured to be slidable relative to the accommodating member 132'.

[0165] According to the operating valve 103' equipped with the housing member 132' as the operating valve housing described above, chips entering the recessed portion 105i can be introduced by descending into the housing interior 132a' of the housing member 132' without being retained in the recessed portion 105i. It is preferable to provide an outlet (not shown) at the lower end of the housing member 132' so that it can be opened and closed, and in this way, the chips introduced into the housing member 132' can be appropriately discharged to the outside.

[0166] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0167] For example, in the above-mentioned Example 1, the flow control valve 10 has a plug body 11 as its valve body that passes through the hole 1b of the fluid pipe 1 and comes into close contact with the inner surface 1c, but this is not limited to this, and any type of valve body can be applied as long as it is capable of controlling the fluid in the pipe.

[0168] Also, for example, in Examples 1 and 2, the hole was drilled with a hole saw 72a having a smaller diameter than the fluid pipe 1, and in Example 3, the hole was drilled with an end mill 272 having a smaller diameter than the fluid pipe 1, but the present invention is not limited to this, and a part of the fluid pipe inside the housing 5 may be cut with a hole saw, a tool, a wire saw, or the like having a larger diameter than the fluid pipe 1, or a part of the fluid pipe line may be cut, and the cut piece may be removed to install a plug that seals the inner circumferential surface of the housing as a valve seat, or a flow control valve having an inner valve body with a built-in valve body, in an uninterrupted flow state. In other words, the pipe drilling device according to the present invention may be one that generates cuttings from the pipe wall of the fluid pipe by the drilling machine, and the drilling of the present invention is not limited to simply forming a hole in the fluid pipe, but includes aspects such as cutting or cutting.

[0169] In addition, in Examples 1 to 3, the open ends 5c, 105c, 205c of the housing branch off horizontally and open, but the present invention can also be applied to cases where the open ends branch off vertically and holes are drilled in the up and down directions, or where holes are drilled from an angled inclined direction.

[0170] In addition, in Examples 1 to 3, protrusions 75d, 178d, and 271d are provided at the inner wall portion 75a, the cylindrical body 178, and the tip portion of the mounting flange tube 271 for chip collection, but multiple protrusions may be provided, and the shape is not limited to this, and may be, for example, a lattice-like inner surface, may have multiple protrusions, or may be coated with a viscous material.

[0171] Furthermore, the cylindrical bodies 178, 188 are not necessarily limited to being formed in a cylindrical shape, but may be formed in a semi-cylindrical shape or a substantially C-shape.

[0172] In addition, in the first to third embodiments, the working valves 3, 103, 203 are installed so as to extend in the pipe direction of the fluid pipes 1, 101, 201, but they may be installed perpendicular to the pipe direction or at an appropriate angle in the circumferential direction, and may be installed at an angle such that the operating part side of the outer end of the working valve gradually approaches or recedes from the pipe, not limited to being parallel to the pipe. In this case, it goes without saying that the openings 5b, 105b, 205b and the recessed parts 5i, 105i, 205i are also designed in the above-mentioned directions as appropriate.

[0173] Furthermore, when drilling, there is a risk that chips may remain in the multiple through holes through which the multiple push bolts 105f can be inserted, particularly on the lower side, so it is a good idea to block the through holes from the inner side of the neck with an elastic material such as rubber or sponge, or a material such as tape, plastic, or metal before drilling, or to clean the through holes after drilling. [Explanation of symbols]

[0174] 1 Fluid tube 3 Working valve 5. Cabinet 5d neck 5i Recessed part (recessed valve seat part) 5p female screw hole (discharge port) 7 Drilling machine 10. Flow Control Valve 31 Working valve body 71 Mounting flange tube (housing tube) 72 Cutter 75a Inner wall portion (cylindrical portion) 75d protrusion 75p communication port 76b Sealing material (sealing material) 101 Fluid pipe 103 Working valve 105,105' Case 105d Neck 105i,105i' Concave part (concave valve seat part) 105p Recessed part (recessed valve seat part) 105t tapered surface 107 Drilling machine 110 Flow control valve 117 Communication opening (discharge port) 131,131' Working valve body 132, 132' housing member 172 cutter 178 Cylindrical body (cylindrical part) 178d Protrusion 181 Projection part (engaging part) 182 Rubber member (engagement part) 188 Cylindrical body (cylindrical part) 190 Sweeping section 201 Fluid pipe 203 Working valve 205 Case 205d Neck 205i Recessed part (recessed valve seat part) 205p female screw hole (exhaust port) 207 Drilling machine 210 Flow control valve 231 Working valve body 271 Mounting flange tube (cylindrical part) 271d Protrusion 272 End mill (cutter) 276 Sealing materials (sealing materials) 280 Suction tube (cylindrical part) 372 Cutter 372a Hole saw (cylindrical part) 390 Sweeping section

Claims

1. A pipe punching device comprising at least a housing having a split structure for sealingly fitting a fluid pipe around the outside, an operating valve having an operating valve body adapted to come into contact with and separate from a concave valve seat provided in a neck portion of the housing and configured to be detachable from the neck portion, and a punching machine having a cutter having a cutting blade inserted into the housing and punching the fluid pipe in an uninterrupted flow state, and an advancing and retreating mechanism for advancing and retreating the cutter, A pipe drilling device characterized in that the neck portion is provided with a suction pipe for discharging chips together with the fluid in the housing.

2. 2. The tube piercing device of claim 1, wherein the suction tube is inserted into the neck.

3. 3. The pipe piercing device according to claim 1, wherein the suction pipe is configured to be movable along the concave valve seat portion.

4. 4. The pipe piercing device according to claim 3, wherein the suction pipe is configured to be able to cover the opening of the concave valve seat portion.

5. 5. The pipe punching device according to claim 1, wherein the suction pipe is provided with a valve capable of opening and closing the inside of the suction pipe.

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