Fluid pipe connection device, joining member, and method for installing fluid pipe connection device

Abstract

To provide a fluid pipe connecting device, a joining member, and an installation method of the fluid pipe connecting device, capable of installing the joining member in a predetermined position of a casing, even if chips and foreign matter exist in a fitting groove part of the casing.SOLUTION: A fluid pipe connecting device connected to a portion to be cut of a fluid pipe through which a fluid flows includes a housing 1 attached to the portion to be cut in a close contact state, and a joining member 2 bayonet-joined to an 1H of an opening of the housing 1, wherein the 1H of the opening has a fitting groove 15 that can be fitted to a joining projection 23 projecting from an outer peripheral surface of the joining member 2, and a rotation restricting portion 16 that restricts rotation of the joining projection 23 with respect to the fitting groove 15, and at least one of the 1H of the opening and the joining member 2 has a foreign matter collecting structure 91 capable of collecting foreign matter generated by drilling the portion to be cut of the fluid pipe.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a fluid pipe connection device, a joining member, and an installation method for the fluid pipe connection device. [Background technology]

[0002] Conventionally, fluid pipe connection devices such as gate valve devices that can freely open and close the flow path of a fluid pipe and closing devices that close the flow path of a fluid pipe have been known (see, for example, Patent Document 1). The fluid pipe connection device is composed of a housing that is attached in close contact with the part of the fluid pipe to be cut, and a joining member such as a gate valve that is connected to the housing, and is installed on the fluid pipe under an uninterrupted flow condition.

[0003] The fluid pipe connection device described in Patent Document 1 bayonet-connects the gate valve and the housing by rotating the gate valve relative to the housing while the connecting protrusion (the valve cover-side bayonet claw in Patent Document 1) on the gate valve is engaged with the fitting groove on the housing. The housing is provided with a rotation restriction part that restricts the rotation of the gate valve, and the connecting protrusion comes into contact with the rotation restriction part, thereby positioning the gate valve in a predetermined position. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-161334 Summary of the Invention [Problem to be solved by the invention]

[0005] When drilling a hole in a fluid pipe under uninterrupted flow conditions while the section to be cut is covered by a housing, foreign matter such as chips generated by drilling can accumulate in the fitting groove of the housing. If a connecting member such as a gate valve is bayonet-connected to the housing with chips accumulated in the fitting groove, the chips or other foreign matter can become trapped between the rotation restriction portion and the connecting protrusion, making it impossible to rotate the connecting member to the specified position. This can cause the gate valve device to malfunction or require the gate valve device to be reinstalled.

[0006] Therefore, there is a need for a fluid pipe connection device, a joining member, and an installation method for a fluid pipe connection device that can install the joining member in a predetermined position on the housing even if foreign matter such as chips is present in the fitting groove of the housing. [Means for solving the problem]

[0007] The characteristic configuration of the fluid pipe connection device of the present invention is that it is a fluid pipe connection device that is connected to a portion of a fluid pipe through which a fluid flows that is to be cut, and it comprises a housing that is attached in close contact with the portion to be cut, and a joining member that is bayonet-connected to an opening of the housing, the opening having a fitting groove portion that can fit with a joining convex portion protruding from the outer surface of the joining member, and a rotation regulating portion that regulates the rotation of the joining convex portion relative to the fitting groove, and at least one of the opening and the joining member having a foreign matter recovery structure that can recover foreign matter generated by perforation of the portion to be cut of the fluid pipe.

[0008] According to this characteristic configuration, at least one of the opening and the connecting member has a foreign matter collection structure that can collect foreign matter generated by perforating the portion of the fluid pipe to be cut, so that even if foreign matter accumulates in the fitting groove of the housing, the foreign matter will not interfere with the rotation of the connecting protrusion and prevent the connecting protrusion from abutting against the rotation restricting portion. Therefore, it is possible to install the connecting member in a predetermined position regardless of whether or not foreign matter has accumulated in the fitting groove, and the installation work of the fluid pipe connection device can be performed efficiently.

[0009] In addition to the above configuration, the joining protrusion may have an abutment surface that abuts against the rotation regulating portion, and the foreign matter recovery structure may be a joining member-side notch provided on the abutment surface.

[0010] With this, even if foreign matter such as chips accumulated in the fitting groove moves toward the rotation restricting portion as the joining protrusion rotates, the joining member-side notch provided on the abutment surface collects the foreign matter, so the abutment between the joining protrusion and the rotation restricting portion is not hindered by the foreign matter, making it easy to install the joining member in the specified position.

[0011] In addition to the above configuration, the joining convex portion may have a contact surface that contacts the rotation regulating portion, and the foreign matter recovery structure may be a joining recess provided on the outer surface, continuous with the contact surface on the same circumference as the joining convex portion.

[0012] With this, even if foreign matter such as chips accumulated in the fitting groove moves toward the rotation restricting portion as the joining protrusion rotates, the joining recess provided continuously with the abutment surface collects the foreign matter, so the abutment between the joining protrusion and the rotation restricting portion is not hindered by the foreign matter. This makes it easy to install the joining member in the specified position.

[0013] In addition to the above configuration, the foreign matter recovery structure may be a notch provided in the fitting groove near the rotation restricting portion.

[0014] With this, even if foreign matter such as chips accumulated in the fitting groove moves toward the rotation restricting portion as the joining protrusion rotates, the fitting groove side notch provided in the fitting groove collects the foreign matter, so the contact between the joining protrusion and the rotation restricting portion is not hindered by the foreign matter, making it easy to install the joining member in the specified position.

[0015] In addition to the above configuration, the rotation regulating portion may have a contact wall portion that contacts the joining convex portion, and the foreign matter recovery structure may be a notch on the contact wall portion provided in the contact wall portion.

[0016] With this, even if foreign matter such as chips accumulated in the fitting groove moves toward the rotation restricting part as the joint protrusion rotates, the foreign matter is collected by the abutment wall side notch provided in the abutment wall that abuts the joint protrusion of the rotation restricting part, so the abutment between the joint protrusion and the rotation restricting part is not hindered by the foreign matter. This makes it easy to install the joint member in the specified position.

[0017] In addition to the above configuration, the joining convex portion has a contact point that contacts the rotation regulating portion and a contact surface that includes the contact point, and the contact surface includes a portion that is spaced away from the rotation regulating portion in a radially outward or radially inward direction from the contact point when the rotation regulating portion and the contact point are in contact, and the foreign matter recovery structure may be a space surrounded by the rotation regulating portion and the portion.

[0018] With this, even if foreign matter such as chips accumulated in the fitting groove moves toward the rotation restricting portion as the joining protrusion rotates, the foreign matter moves into the space surrounded by the rotation restricting portion and the abutment surface, so the abutment between the abutment point of the joining protrusion and the rotation restricting portion is not hindered. This makes it easy to install the joining member in the specified position.

[0019] In addition to the above configuration, the joining member may be a valve cover incorporating a valve body that can freely open and close the flow path of the fluid pipe, a lid or inner plug that seals the opening, or a pipe member.

[0020] This allows joining members with various functions to be installed in the opening of the housing with high work efficiency.

[0021] A characteristic configuration of the joining member according to the present invention is that in the fluid pipe connection device having the above configuration, it is bayonet-joined to the opening of the housing.

[0022] This allows the joining member to be placed in the opening of the housing with a simple operation even if foreign matter such as chips has accumulated in the fitting groove of the housing.

[0023] Furthermore, the method for installing a fluid pipe connection device according to the present invention comprises a housing installation step of attaching the housing in close contact with the portion of the fluid pipe to be cut; a working valve installation step of connecting a valve device having a working valve to the opening of the housing; a drilling step of drilling the portion of the fluid pipe to be cut; a foreign matter removal step of removing the foreign matter generated by the drilling step; and a joining step of bayonet-joining the joining member and the opening.

[0024] According to this, even if foreign matter such as chips that could not be removed in the foreign matter removal process accumulates in the fitting groove of the housing, the foreign matter collection structure of at least one of the opening and the joining member does not prevent the joining protrusion and the rotation restricting portion from abutting against each other in the joining process. Therefore, it is possible to install the joining member in a predetermined position regardless of the presence or absence of foreign matter in the fitting groove, and the installation of the fluid pipe connection device can be performed efficiently. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 2 is a longitudinal cross-sectional view of the fluid pipe and the valve cover in a direction perpendicular to the axial direction of the fluid pipe. [Figure 2] FIG. 2 is a longitudinal cross-sectional view of a fluid pipe and a gate valve in the axial direction of the fluid pipe. [Figure 3] FIG. 10 is a perspective view of the opening of the housing and the lower member of the valve cover. [Figure 4a] FIG. 10 is a perspective view showing a state in which the valve cover is inserted into the opening of the housing. [Figure 4b] FIG. 10 is a plan view showing the state in which the valve cover is inserted into the opening of the housing. [Figure 5a] 10 is a perspective view showing a state in which the joining protrusion of the valve cover and the rotation restricting portion of the housing are in contact with each other. FIG. [Figure 5b] 10 is a plan view showing a state in which the joining protrusion of the valve cover and the rotation restricting portion of the housing are in contact with each other. FIG. [Figure 6a] FIG. 10 is a perspective view showing the state in which the valve cover fixing member is attached. [Figure 6b] FIG. 10 is a plan view showing the state in which the valve lid fixing member is attached. [Figure 7] FIG. 10 is a longitudinal cross-sectional view taken in a direction perpendicular to the pipe axis direction of the fluid pipe and the housing in a state where a housing installation step has been performed. [Figure 8] 1 is a longitudinal cross-sectional view in a direction perpendicular to the pipe axis direction of the fluid pipe and the housing with the operation valve and the drilling device installed. FIG. [Figure 9] 10 is a longitudinal cross-sectional view taken in a direction perpendicular to the axial direction of the fluid pipe and the housing during the drilling process. FIG. [Figure 10] FIG. 10 is a longitudinal cross-sectional view taken in a direction perpendicular to the pipe axis direction of the fluid pipe and the housing after a drilling step has been performed. [Figure 11] 10 is a longitudinal cross-sectional view in a direction perpendicular to the axial direction of a fluid pipe and a housing with a removal device installed. FIG. [Figure 12] 10 is a longitudinal cross-sectional view taken along a direction perpendicular to the axial direction of the fluid pipe and the housing during the foreign matter removal process. FIG. [Figure 13] FIG. 2 is a longitudinal cross-sectional view taken in a direction perpendicular to the axial direction of the fluid pipe and the housing with the removal device removed. [Figure 14] FIG. 10 is a longitudinal cross-sectional view of the fluid pipe and the housing in a direction perpendicular to the pipe axis direction with the insertion device installed. [Figure 15] 10 is a longitudinal cross-sectional view taken along a direction perpendicular to the axial direction of the fluid pipe and the housing in a joining process. FIG. [Figure 16] 10 is a side view of the fluid pipe and the housing in a direction perpendicular to the pipe axis direction after the joining step has been performed. FIG. [Figure 17] FIG. 10 is a perspective view of a valve cover main body according to a second embodiment. [Figure 18] FIG. 10 is a perspective view of an opening according to a third embodiment. [Figure 19] FIG. 10 is a partial perspective view of an opening according to a fourth embodiment. [Figure 20] FIG. 13 is a plan view of an opening and a lower member according to a fifth embodiment. [Figure 21] FIG. 13 is a plan view of an opening and a lower member according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0026] First Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0027] [Basic configuration] 1 and 2, the fluid pipe connection device 100 according to the first embodiment includes a housing 1 configured as a split T-pipe and attached in close contact with the outer surface of a fluid pipe W through which a fluid flows, a valve cover 2 (an example of a joining member) placed in close contact with the top of the housing 1 and joined to an opening 1H of the housing 1, and a valve cover fixing member 4 placed on the top of the valve cover 2. The valve cover 2 incorporates a valve element 3 that can freely open and close the flow path of the fluid pipe W.

[0028] Hereinafter, the horizontal direction in which the fluid pipe W extends, or the pipe axis direction, will be referred to as the "X direction." The horizontal direction perpendicular to the X direction will be referred to as the "Y direction," and the direction perpendicular to the X and Y directions (vertical direction) will be referred to as the "Z direction." In addition, the vertically upper side of the Z direction will be referred to as the "upper side Z1," and the vertically lower side will be referred to as the "lower side Z2."

[0029] [Case] The housing 1 has a first divided member 11 arranged on the upper side Z1 of the fluid pipe W, and a second divided member 12 arranged on the lower side Z2 of the fluid pipe W. The fluid pipe W is sandwiched between the first divided member 11 and the second divided member 12 in the vertical direction. The first divided member 11 and the second divided member 12 are cast products made of, for example, ductile cast iron.

[0030] The first divided member 11 and the second divided member 12 have a cut surface that is aligned along a plane that includes the pipe axis of the fluid pipe W, and are connected to each other in a sealed state. Here, "a cut surface that is aligned along a plane that includes the pipe axis of the fluid pipe W" means that the cut surface is on a plane that includes the pipe axis of the fluid pipe W or on a plane that is approximately parallel to said plane.

[0031] The first divided member 11 is formed in a semi-cylindrical shape that covers approximately half (the upper half) of the outer periphery of the fluid pipe W, and has semi-circular first end openings 11a formed at both ends in the X direction that conform to the cross-sectional shape of the fluid pipe W. The first divided member 11 has a first flange 11f that extends outward along its split surface. The top surface of the first divided member 11 is formed with a cylindrical extension 13 that extends upward Z1, and an opening 1H is formed at the end of the extension 13 opposite the fluid pipe W.

[0032] Similarly, the second divided member 12 is formed in a semi-cylindrical shape that covers approximately half (the lower half) of the outer periphery of the fluid pipe W, and has semi-circular second end openings 12a formed at both ends in the X direction that conform to the cross-sectional shape of the fluid pipe W. The second divided member 12 has a second flange portion 12f that extends outward along the split surface thereof.

[0033] These first divided member 11 and second divided member 12 are configured so that their split surfaces are aligned and can be integrated to cover the entire circumference of the fluid pipe W. When attaching the housing 1 to the fluid pipe W, the first divided member 11 and the second divided member 12 are positioned to sandwich the fluid pipe W, and with their split surfaces facing each other, the first flange portion 11f and the second flange portion 12f are fastened together with multiple fasteners B. In this way, the housing 1 is attached and fixed to the outer surface of the fluid pipe W. The fasteners B are, for example, bolts and nuts.

[0034] As shown in FIG. 1, a set screw S1 is threaded into both ends of the first divided member 11 and the second divided member 12 in the X direction (left-right direction in FIG. 1) so as to penetrate the first divided member 11 or the second divided member 12 and abut against the outer wall portion of the fluid pipe W. The first divided member 11 and the second divided member 12 are positioned relative to the fluid pipe W by this set screw S1.

[0035] Furthermore, a recess 110 for holding a ring-shaped seal member 111 is formed in first divided member 11 in the X direction (left-right direction in FIG. 1) inward of the location of set screw S1. The seal member 111 provides a watertight seal between the inner wall of first divided member 11 and the outer wall of fluid pipe W, so that first divided member 11 of housing 1 is provided in a sealed (watertight) state with respect to fluid pipe W.

[0036] Next, we will explain the structure of the extension portion 13. As shown in Figures 1 to 3, the extension portion 13 has a cylindrical shape extending along the Z direction, and an opening 1H is formed at the end of the extension portion 13 opposite the fluid pipe W. The diameter of the opening 1H gradually increases as it goes upward Z1.

[0037] As shown in Fig. 3, the inner wall of the extension portion 13 at the opening 1H is provided with a first extension portion 13a extending radially outward, and a second extension portion 13b extending radially outward from the upper end of the inner wall extending from the first extension portion 13a toward the upper side Z1. Furthermore, a pair of third extension portions 13c, 13c extending radially inward is formed at the upper end of the inner wall extending from the second extension portion 13b toward the upper side Z1. The first extension portion 13a and the second extension portion 13b are formed along the entire circumferential direction of the inner wall of the extension portion 13. The pair of third extension portions 13c, 13c are formed at positions symmetrical with respect to the axis of the extension portion 13.

[0038] The second extension portion 13b and the third extension portion 13c have approximately the same radial extension dimension. Therefore, the second extension portion 13b and the third extension portion 13c form a fitting groove portion 15 in the opening 1H of the extension portion 13. The fitting groove portion 15 is formed so that a joining protrusion 23 of the valve cover 2, which will be described later, can be fitted into it. Furthermore, at the upper end of the extension portion 13, the space between the part where the third extension portion 13c is not formed and the second extension portion 13b functions as an insertion portion 14 into which the joining protrusion 23 can be inserted. The relationship between the joining protrusion 23, the insertion portion 14, and the fitting groove portion 15 will be described later.

[0039] A rotation restricting portion 16, which is a block member connecting the third extending portion 13c and the second extending portion 13b, is formed on one of the circumferential ends of the pair of third extending portions 13c. The pair of rotation restricting portions 16 formed on the pair of third extending portions 13c are also formed at positions symmetrical with respect to the axis of the extending portion 13. The rotation restricting portion 16 separates the insertion portion 14 and the fitting groove portion 15 that are adjacent to each other in the circumferential direction. Therefore, of the insertion portion 14 adjacent to the fitting groove portion 15, one insertion portion 14 communicates with the space within the fitting groove portion 15, but the other insertion portion 14 does not communicate with the space within the fitting groove portion 15.

[0040] The rotation restricting portion 16 extends radially inward from the inner wall of the extension portion 13 at the fitting groove portion 15, and is formed in a trapezoidal shape whose width decreases radially inward (see FIG. 5b). The maximum radially inward dimension of the rotation restricting portion 16 is substantially the same as the radially inward dimension of the second extension portion 13b. The rotation restricting portion 16 has an abutment wall portion 16a that abuts against a joint protrusion 23 of the valve cover 2, which will be described later. The abutment wall portion 16a includes the surface of the rotation restricting portion 16 that extends from the inner wall of the extension portion 13, on the fitting groove portion 15 side.

[0041] The first extending portion 13a is provided with a pair of housing-side guide grooves 19, 19, which are notches that guide movement of the valve body 3 in the insertion direction (Z direction), which will be described later. The pair of housing-side guide grooves 19, 19 are provided at positions that overlap with the insertion portion 14 when viewed in the Z direction, and face each other across the axis of the extending portion 13. The pair of housing-side guide grooves 19, 19 are formed continuously along the Z direction from the first extending portion 13a toward the end of the extending portion 13 on the fluid pipe W side (see FIG. 2).

[0042] [Opercle] Next, the valve cover 2 incorporating the valve disc 3 will be described. As shown in FIGS. 1 to 3, the valve cover 2 comprises a valve cover main body 20 incorporating the valve disc 3, and a valve operating shaft 30 for operating the valve disc 3. The valve cover main body 20 is composed of a cylindrical lower member 21 extending in the Z direction, and an upper member 22 connected to the lower member 21 and closing an opening on the upper side Z1 of the lower member 21. The upper member 22 supports the valve disc 3 so that it can move freely in the Z direction. The lower member 21 and the upper member 22 are preferably formed integrally. The valve cover main body 20 is bayonet-connected to the extension portion 13 in a state where it fits within the opening 1H of the extension portion 13. As a result, the valve cover 2 closes the opening 1H.

[0043] As shown in FIG. 3 , the lower member 21 of the valve cover main body 20 has a pair of connecting protrusions 23, 23 and a sealing portion 24 on its outer peripheral surface. The connecting protrusions 23 extend radially outward from the outer surface of the lower member 21 along the outer surface. In this embodiment, two connecting protrusions 23 are provided at positions symmetrical about the axis of the lower member 21. The dimension from the axis of the lower member 21 to the outer peripheral edge of the connecting protrusions 23 is approximately the same as the inner diameter of the insertion portion 14 and the extension portion 13 in the fitting groove portion 15, and the dimension of the connecting protrusions 23 in the Z direction is approximately the same as the dimension between the second extension portion 13b and the third extension portion 13c of the extension portion 13. The circumferential dimension of the connecting protrusions 23 is smaller than the circumferential dimension of the insertion portion 14.

[0044] Furthermore, a joining member-side notch 91 is formed in one of the circumferential ends of the joining protrusion 23 by cutting out a portion of the joining protrusion 23. As will be described later, the joining member-side notch 91 functions as a foreign matter collection structure for the fluid pipe connection device 100. In this embodiment, the joining member-side notch 91 is formed by cutting out the lower side Z2 of the end of the joining protrusion 23. However, the joining member-side notch 91 may be formed by cutting out the upper side Z1 of the joining protrusion 23, or by cutting out both a portion of the lower side Z2 and a portion of the upper side Z1. The joining member-side notches 91 provided in the pair of joining protrusions 23, 23 are each provided at a position symmetrical with respect to the axis of the lower member 21. The joining member-side notch 91 may be provided at both circumferential ends of the joining protrusion 23. Alternatively, the joining member-side notch 91 may be provided on the inside instead of the end, or a combination of these may be provided. The joining member-side notch 91 may be provided on either the upper side Z1 or the lower side Z2 of the joining protrusion 23.

[0045] A sealing portion 24 is provided on the outer peripheral surface of the lower member 21, on the side Z2 below the joining protrusion 23. The sealing portion 24 is an annular rubber packing or the like, and is fixed by fitting into a groove formed in the outer peripheral surface of the valve cover 2. As shown in Figures 1 and 2, when the valve cover 2 is joined to the extension portion 13, the outer wall of the lower member 21 and the inner wall of the extension portion 13 are sealed by the sealing portion 24, so that the valve cover 2 is connected to the extension portion 13 in a sealed state.

[0046] 3, a pair of valve cover side guide grooves 25, 25 that guide movement of the valve disc 3 in the Z direction are formed on the inner peripheral surface of the lower member 21. The valve cover side guide groove 25 is provided at a position offset by 90° from the joint protrusion 23 when viewed in the circumferential direction, and the pair of valve cover side guide grooves 25, 25 are provided so as to face each other. The circumferential dimension of the valve cover side guide groove 25 is approximately the same as the circumferential dimension of the case side guide groove 19.

[0047] 1 and 2, the upper member 22 is connected to the upper side Z1 of the lower member 21, and includes a cylindrical portion 22a extending to the upper side Z1, and a pair of protruding portions 22b, 22b protruding radially outward from the outer circumferential surface of the cylindrical portion 22a. An internal space is formed in the cylindrical portion 22a and the protruding portion 22b to accommodate the valve operating shaft 30 and the valve element 3, and this internal space is in communication with the internal space of the lower member 21.

[0048] A valve operating shaft 30 is installed on the upper member 22 in a state where it penetrates the surface of the upper side Z1, and the portion of the valve operating shaft 30 that protrudes further into the upper side Z1 than the upper member 22 is covered with a key cap 26. A valve element 3 is connected to the lower end of the valve operating shaft 30, and a nut N that is attached to the valve element 3 in an unrotatable state is screwed onto the valve operating shaft 30. This allows the valve element 3 to be freely moved along the Z direction by rotating the valve operating shaft 30.

[0049] 1 and 2, the valve element 3 includes a metal valve body 31 and a sealing member 32 made of elastic rubber or the like that is disposed on the valve body 31 at a location close to the fluid pipe W. When the valve element 3 is inserted into the fluid pipe W, the outer peripheral surface of the sealing member 32 comes into contact with the inner wall of the fluid pipe W, and the sealing member 32 is compressed and deformed, bringing them into a tight contact state, thereby blocking the flow path of the fluid pipe W.

[0050] The valve body 3 also has a pair of convex engagement pieces 33, 33 that protrude outward (in the Y direction in Figure 2). The engagement pieces 33 engage with the valve cover side guide groove portion 25 of the valve cover main body portion 20 and the housing side guide groove portion 19 of the extension portion 13, thereby preventing the valve body 3 from rotating relative to the valve cover 2. The pair of engagement pieces 33, 33 extend in the same direction as the pair of protrusions 22b, 22b of the upper member 22.

[0051] [Method of joining the valve cover] Next, a method for bayonet-connecting the lid 2 to the opening 1H of the extension portion 13 will be described with reference to Figures 4 and 5. When connecting the lid 2 to the opening 1H of the extension portion 13, first, as shown in Figures 4a and 4b, the lid 2 is inserted into the opening 1H of the extension portion 13 so that the pair of connecting protrusions 23, 23 fit into the pair of insertion portions 14, 14. At this time, the lower surface of the connecting protrusion 23 abuts against the upper surface of the second extension portion 13b, restricting movement of the lid 2 downward Z2 and determining the position of the lid 2 in the Z direction. In this state, the outer wall of the lower member 21 of the lid 2 and the inner wall of the extension portion 13 are sealed by the sealing portion 24 (see Figures 1 and 2). At this time, it is also advisable to adjust the positional relationship between the valve cover 2 and the insertion portion 14 so that the circumferential end of the joining convex portion 23 on the side where the joining member side notch 91 is provided can fit into the fitting groove portion 15.

[0052] 5a and 5b, when the valve cover 2 is rotated a predetermined amount (90° in this embodiment) toward the fitting groove 15 and the rotation restricting portion 16 and the connecting protrusion 23 are brought into contact, the valve cover 2 is bayonet-connected to the extension portion 13. At this time, the contact wall portion 16a of the rotation restricting portion 16 and the contact surface 23a of the connecting protrusion 23 come into contact. In the bayonet-connected state, the third extension portion 13c of the extension portion 13 acts as a restricting portion 17 that restricts movement of the valve cover 2 toward the upper side Z1. Also, at this time, as shown in FIG. 5b, the valve cover-side guide groove 25 of the lower member 21 and the housing-side guide groove 19 of the extension portion 13 are arranged so as to be continuous along the Z direction.

[0053] Incidentally, foreign matter such as chips generated by drilling the fluid pipe W may accumulate in the second extension portion 13b of the extension portion 13. When the valve cover 2 is bayonet-connected to the opening 1H of the extension portion 13 in this state, the chips or other foreign matter may interfere with the rotation of the valve cover 2 and move between the connecting protrusion 23 and the rotation restricting portion 16, preventing them from abutting against each other. When the connecting protrusion 23 and the rotation restricting portion 16 are prevented from abutting against each other, the valve cover-side guide groove 25 and the housing-side guide groove 19 are not continuous, so the valve element 3 cannot be moved in the Z direction, and the fluid pipe connection device 100 cannot be used as a gate valve.

[0054] On the other hand, the fluid pipe connection device 100 of this embodiment has a foreign matter collection structure. Specifically, a connecting member notch 91 is formed on each of the abutment surfaces 23a of the pair of connecting protrusions 23, 23 that contact the rotation restricting portion 16. When the connecting protrusions 23 and the rotation restricting portion 16 are in abutting contact with each other, a space is formed between the connecting protrusions 23 and the rotation restricting portion 16 by the connecting member notch 91. Therefore, even if foreign matter such as chips accumulates in the second extension portion 13b, the foreign matter interfering with the rotation of the valve cover 2 is collected in the connecting member notch 91, and the abutment between the connecting protrusions 23 and the rotation restricting portion 16 is not hindered. In this way, because the valve cover 2 according to this embodiment has a foreign matter collection structure, it can be bayonet-connected to a predetermined position of the opening 1H of the extension portion 13 regardless of the presence or absence of foreign matter.

[0055] As shown in Figure 5b, when the valve cover 2 is bayonet-connected to the opening 1H of the extension portion 13, the valve cover side guide groove portion 25 and the housing side guide groove portion 19 are continuous along the Z direction, allowing the valve body 3 to move along the Z direction.

[0056] [Valve cover fixing member] 1 and 2, when the valve cover 2 is bayonet-connected to the opening 1H of the extension part 13, a valve cover fixing member 4 that covers at least a part of the valve cover 2 is arranged on the side Z1 above the valve cover 2. As shown in FIG. 5a, the valve cover fixing member 4 comprises a covering part 41 that covers the upper part of the valve cover 2, and a pair of downward extension parts 42, 42 that extend from the outer end part of the covering part 41 to the lower side Z2.

[0057] The covering part 41 is formed in an annular shape, and its inner open circle is formed so that its diameter is approximately the same as the outer diameter of the lower member 21. Therefore, when the valve lid fixing member 4 is placed on top of the valve lid 2, the valve lid 2 is covered by the covering part 41 except for the protruding portion that protrudes to the upper side Z1. The downward extension parts 42, 42 are arranged to cover the outer periphery of the extension part 13, and as shown in FIG. 1, the valve lid fixing member 4 is fixed to the extension part 13 by threading a setscrew S2 into a threaded hole (not shown) formed in the downward extension part 42. The valve lid fixing member 4 is arranged so that the covering part 41 covers the upper part of the valve lid 2, and the setscrew S2 is tightened while abutting against the outer wall of the extension part 13, whereby the valve lid 2 is fixed by being sandwiched between the valve lid fixing member 4 and the extension part 13.

[0058] A pair of protrusions 43, 43 are formed on the surface of the lower side Z2 of the covering part 41, protruding toward the lower side Z2 along the circumference of the opening circle. The pair of protrusions 43, 43 are arranged alternately with the pair of downward extensions 42 along the circumferential direction of the covering part 41. The protrusions 43 fit into the insertion part 14 of the extension part 13 when the valve lid fixing member 4 is positioned above the valve lid 2. As a result, as shown in Figures 6a and 6b, the protrusions 43 fitted into the insertion part 14 come into contact with the joint protrusion 23 of the valve lid 2, thereby restricting rotation of the valve lid 2.

[0059] [Method for installing a fluid pipe connection device] 7 to 16, a method for installing the fluid pipe connection device 100 will be described. The method for installing the fluid pipe connection device 100 according to this embodiment includes a housing installation step of attaching the housing 1 in close contact with the portion of the fluid pipe W to be cut, a working valve installation step of connecting a valve device having a working valve 5 to the opening 1H of the housing 1, a drilling step of drilling the portion of the fluid pipe W to be cut, a foreign matter removal step of removing foreign matter generated in the drilling step, a joining step of bayonet-jointing the valve cover 2 and the opening 1H, and a valve cover fixing member attachment step of attaching the valve cover fixing member 4 to the top of the valve cover 2.

[0060] [Housing installation process] First, we will explain the housing installation process, in which the housing 1 is attached in a tight contact state to the portion of the fluid pipe W to be cut. As shown in Figure 7, in the housing installation process, the second divided member 12 is placed on the lower part of the outer periphery of the fluid pipe W, the first divided member 11 is placed in a position that covers the upper part of the outer periphery of the fluid pipe W, and these are connected with a plurality of fasteners B to attach the housing 1. At this time, the seal member 111 is sandwiched in the recess 110 of the first divided member 11, so that the first divided member 11 of the housing 1 is provided to the fluid pipe W in a sealed (watertight) state.

[0061] After the casing 1 is installed, a hydraulic tool (not shown) may be attached to the opening 1H of the extension 13, and a hydraulic test of the extension 13 in the first divided member 11 may be performed.

[0062] [Work valve installation process] Next, the working valve installation step of installing the working valve 5 in the opening 1H of the housing 1 will be described. As shown in FIG. 8, the working valve 5 has a working valve main body 51 that opens and closes the opening 1H of the extension portion 13, and a working valve housing 50 that houses the working valve main body 51 so that it can move horizontally. The working valve housing 50 is composed of a cylindrical main body portion that is arranged coaxially with the extension portion 13, and a housing portion that houses the working valve main body 51. In the working valve installation step, first, the working valve housing 50 is connected in a sealed state to the opening 1H of the extension portion 13 of the housing 1. A seal member may be sandwiched between the connecting surfaces of the extension portion 13 and the working valve housing 50. The working valve 5 opens and closes the opening 1H by moving the working valve main body 51 horizontally between a valve-closing position of the opening 1H and a valve-open position of the opening 1H (see FIGS. 8 and 10).

[0063] 8, after the operation valve 5 is installed, a drilling device 6 is attached so as to cover the upper opening on the upper side Z1 of the operation valve housing 50. The drilling device 6 comprises a drilling machine housing 60, a cylindrical cutter 61, and a center drill 62 arranged coaxially with the rotation axis of the cutter 61. The ends of the cutter 61 and center drill 62 on the upper side Z1 are fixedly connected to a drive shaft 63 that drives and rotates them. Furthermore, the cutter 61 and center drill 62 are connected to a drive shaft 64 via the drive shaft 63, and are supported so as to be movable in the Z direction.

[0064] The drilling machine casing 60 is a cylindrical body arranged coaxially with the cutter 61, and houses the cutter 61, center drill 62, etc. inside. The drilling machine casing 60 is coaxial with the extension portion 13. By connecting the drilling machine casing 60 to the upper opening of the work valve casing 50, the internal space of the drilling machine casing 60, the internal space of the work valve casing 50, and the internal space of the casing 1 are brought into communication. By connecting the work valve 5 and the drilling device 6 to the casing 1 in this way, construction can be carried out to form a drilling opening Wa (see FIG. 10 ) in a part of the fluid pipe W (existing pipe) while the fluid is flowing uninterrupted through the fluid pipe W.

[0065] The cutter 61 has a cutting edge formed at its end on the lower side Z2 and functions as a hole saw. The end on the lower side Z2 of the center drill 62 protrudes further downward than the end of the center drill 62 itself.

[0066] [Drilling process] Next, we will explain the drilling process for drilling a hole in the portion to be cut of the fluid pipe W. First, with the cutter 61 and the center drill 62 in the initial position shown in Figure 8, the work valve body 51 is opened to communicate the drilling machine casing 60 with the internal space of the casing 1. Then, the cutter 61 and the center drill 62 start to rotate, and the drive shaft 64 advances to the lower side Z2.

[0067] Since the center drill 62 protrudes below the cutter 61 to the lower side Z2, when the drive shaft 64 is advanced to the lower side Z2, the fluid pipe W and the center drill 62 first come into contact, and the cutting part of the center drill 62 bites into the fluid pipe W, thereby determining the position of the drilling device 6 relative to the fluid pipe W. This makes it possible to form a drilling opening Wa at the target position without misaligning the axis of the drilling device 6.

[0068] 9, the drilling operation is completed when the lower ends of the cutter 61 and center drill 62 penetrate the fluid pipe W and reach the end position of the drilling operation. Upon completion of the drilling operation, a drilling opening Wa is formed, and a cut portion Wb of the fluid pipe W is produced. The cut portion Wb of the fluid pipe W is retrieved by being hooked onto a locking portion (not shown) of the center drill 62 during the process of returning the center drill 62 and cutter 61 to their initial positions.

[0069] By forming the drilling opening Wa, the interior of the casing 1 and the work valve casing 50, and the space in the drilling machine casing 60, become filled with fluid. After the return operation of the drilling device 6 is completed, the work valve body 51 is moved to the closed position to close the opening 1H and discharge the fluid from the drilling machine casing 60. Thereafter, as shown in Figure 10, the cutter 61 and center drill 62 are removed to recover the cut portion Wb, and the drilling machine casing 60 is removed from the work valve 5, thereby completing the drilling operation.

[0070] [Foreign matter removal process] Next, the foreign matter removal step of removing the foreign matter generated in the drilling step will be described. In the foreign matter removal step, first, as shown in Fig. 11, a cleaning device 7 is attached to the upper opening of the working valve housing 50. The cleaning device 7 includes a suction unit 71 that sucks and removes foreign matter such as chips generated by drilling the fluid pipe W, and a cleaning device housing 70 that movably houses the suction unit 71. The cleaning device housing 70 is attached to the working valve housing 50 in a sealed state, sealing off the lower opening on its lower side Z2 and the upper opening of the working valve housing 50.

[0071] After installing the cleaning device 7, as shown in Fig. 12, the work valve 5 is opened to open the opening 1H, and the interior is checked through a sight glass (not shown). While moving the suction unit 71, for example, by moving the suction unit 71 in and out of or tilting the suction unit 71 relative to the cleaning device housing 70, the suction unit 71 uses the water pressure within the pipe to suck in and clean foreign matter such as chips that have accumulated at the bottom of the pipe or in the second extension portion 13b within the extension portion 13. Once cleaning of the inside of the extension portion 13 is complete, the work valve 5 is closed to close the opening 1H, and the fluid is discharged from the cleaning device housing 70. Then, as shown in Fig. 13, the cleaning device 7 is detached from the work valve 5 and removed.

[0072] [Joining process] After the foreign matter removal process, a joining process is carried out in which the valve cover 2 is bayonet-jointed to the extension portion 13. In the joining process, first an insertion process is carried out in which the valve cover 2 is inserted into the opening 1H of the extension portion 13. In the insertion process, as shown in FIG. 14, first, the valve cover 2 is assembled to the insertion device 8, and the insertion device 8 is attached to the operation valve 5. The insertion device 8 has an insertion shaft 81 to which the valve cover 2 is assembled, and an insertion device housing 80 that houses the valve cover 2 and the insertion shaft 81. The insertion device housing 80 is attached to the operation valve housing 50 in a sealed state in which a lower opening on its lower side Z2 and an upper opening of the operation valve housing 50 are sealed.

[0073] After installing the insertion device 8, as shown in Fig. 15, the internal space of the housing 1 and the internal space of the insertion device housing 80 are equalized in pressure, and then the working valve 5 is opened to open the opening 1H. The insertion shaft 81 is advanced downward Z2, and the valve cover 2 is inserted into the extension portion 13 of the housing 1. At this time, it is advisable to adjust the assembly position of the valve cover 2 so that the valve cover 2 is positioned so that the joint protrusion 23 of the valve cover 2 can fit into the insertion portion 14 of the extension portion 13. The valve cover 2 is moved downward Z2 until the lower surface of the joint protrusion 23 abuts against the upper surface of the second extension portion 13b of the insertion portion 14.

[0074] After the joint protrusion 23 of the valve cover 2 is inserted into the insertion portion 14 of the extension portion 13, a rotation step is performed to rotate the valve cover 2. In the rotation step, as shown by the arrow in Figure 15, the operating handle 82 is operated to rotate the insertion shaft 81 a predetermined amount (90° in this embodiment), thereby rotating the valve cover 2 relative to the housing 1 with the joint protrusion 23 fitted into the fitting groove 15, and causing the abutment surface 23a of the joint protrusion 23 to abut against the abutment wall portion 16a of the rotation restricting portion 16 (see Figure 5b). When the joint protrusion 23 is fitted into the fitting groove 15, the restricting portion 17 restricts movement of the upper side Z1 of the valve cover 2 and prevents it from coming off.

[0075] During the rotation process, foreign matter such as chips that was not completely sucked up by the suction unit 71 during the foreign matter removal process may accumulate on the upper surface of the second extension portion 13b of the extension portion 13. This is because the suction of foreign matter such as chips is performed manually, and the degree of foreign matter removal varies depending on the worker, and foreign matter accumulated in the opening 1H of the extension portion 13 is difficult to find. If foreign matter accumulates in the insertion portion 14 and fitting groove portion 15 of the extension portion 13, the foreign matter may interfere with the rotation of the joining protrusion 23 during the rotation process and become trapped between the joining protrusion 23 and the rotation restriction portion 16, which may prevent the valve cover 2 from being positioned properly.

[0076] However, the connecting protrusion 23 in this embodiment has a foreign object collection structure that can collect such foreign objects, so the valve cover 2 can be positioned in the appropriate position regardless of the presence or absence of foreign objects. The foreign object collection structure in this embodiment is a connecting member-side notch 91 formed in the contact surface 23a that contacts the rotation restricting portion 16 (see FIG. 3). Accordingly, the lower side Z2 portion of the contact surface 23a of the connecting protrusion 23 is cut out. Therefore, even if a foreign object interferes with the rotation of the connecting protrusion 23 and moves to the rotation restricting portion 16, the foreign object is contained in the connecting member-side notch 91, and therefore the contact between the contact surface 23a and the contact wall portion 16a is not interrupted. This allows the valve cover 2 to be placed in the predetermined position regardless of the presence or absence of foreign objects, so that the installation of the fluid pipe connection device 100 can be performed efficiently without relying on the ability of the operator performing the foreign object removal process.

[0077] After the valve cover 2 is placed in the predetermined position by the rotation process, the fluid inside the insertion device housing 80 is discharged, and the insertion device 8 and the operating valve 5 are removed from the housing 1 and withdrawn.

[0078] Finally, as shown in Figure 16, the valve cover fixing member attaching step is performed. In this step, the valve cover fixing member 4 is attached in a rotation-restricted state, contacting the valve cover 2 and restricting rotation of the valve cover 2. Specifically, by attaching the protruding portion 43 of the valve cover fixing member 4 so that it fits into the insertion portion 14 of the extension portion 13, the protruding portion 43 comes into contact with the joining protrusion 23 of the valve cover main body 20, allowing the valve cover 2 to be attached in a rotation-restricted state, restricting rotation. After the valve cover fixing member attaching step, a key cap 26 is attached to the top of the valve operating shaft 30.

[0079] By attaching the valve cover fixing member 4 in a rotation-restricted state, the joining protrusion 23 fitted into the fitting groove 15 can be fixed in the circumferential direction of the opening 1H of the extension 13 by being sandwiched between the rotation-restricting portion 16 and the protrusion 43 (see Figure 6b). This makes it possible to appropriately restrict the rotational movement of the valve cover 2 and also to appropriately prevent the valve cover 2 from rattling.

[0080] After the valve cover fixing member 4 is attached in a rotation-restricted state, the set screw S2 is tightened while being pressed against the outer wall portion of the first divided member 11, thereby fixing the valve cover 2 in a state where it is sandwiched between the valve cover fixing member 4 and the first divided member 11 (see Figure 1).

[0081] Second Embodiment The lower member 21 of the valve lid main body 20 according to the second embodiment will be described with reference to Figure 17. The lower member 21 according to the second embodiment has a joining recess 92 provided on the outer peripheral surface on the same circumference as the joining protrusion 23, and continuous with the abutment surface 23a. The other configuration is the same as in the first embodiment, and therefore a description of the similar configuration will be omitted.

[0082] The joint recess 92 is formed by recessing a portion of the outer peripheral surface of the valve cover main body 20 radially inward. Since the valve cover 2 has the joint recess 92, if foreign matter such as chips accumulates on the upper surface of the second extension portion 13b of the extension portion 13 during the rotation step of rotating the valve cover 2 relative to the extension portion 13, the joint recess 92 acts as a foreign matter collection structure. That is, even if foreign matter comes into contact with the joint protrusion 23 during the rotation step, the foreign matter moves into the space formed in the joint recess 92 and, while contained therein, the joint protrusion 23 abuts against the rotation restricting portion 16. This prevents foreign matter from becoming trapped between the joint protrusion 23 and the rotation restricting portion 16, making it possible to place the valve cover 2 in a predetermined position even if foreign matter is present on the extension portion 13.

[0083] Third Embodiment The extension portion 13 according to the third embodiment will be described with reference to Fig. 18. The extension portion 13 according to the third embodiment has a fitting groove side notch 93 provided in the fitting groove 15. The other configurations are the same as those in the first embodiment, and therefore descriptions of the similar configurations will be omitted.

[0084] The fitting groove-side notch 93 is a notch provided on the upper surface of the second extension portion 13b of the fitting groove 15, in the vicinity of the abutment wall portion 16a of the rotation restricting portion 16. By providing the fitting groove 15 with the fitting groove-side notch 93, even if foreign matter such as chips accumulates on the upper surface of the second extension portion 13b, the foreign matter that moves to the rotation restricting portion 16 as the joint protrusion 23 rotates is collected by the fitting groove-side notch 93. Therefore, the abutment between the abutment surface 23a of the joint protrusion 23 and the rotation restricting portion 16 is not hindered, and the valve cover 2 can be installed in a predetermined position. The fitting groove-side notch 93 may be a notch provided on the lower surface of the third extension portion 13c of the fitting groove 15, in the vicinity of the rotation restricting portion 16, or may be provided on the upper surface of the second extension portion 13b of the insertion portion 14. Alternatively, it may be provided on the inner wall of the extension portion 13 between the second extension portion 13b and the third extension portion 13c, or a combination of these may be used.

[0085] Fourth Embodiment The extension portion 13 according to the fourth embodiment will be described with reference to Fig. 19. The extension portion 13 according to the fourth embodiment has an abutment wall portion-side notch 94 provided in the abutment wall portion 16a of the rotation restricting portion 16. The other configurations are the same as those in the first embodiment, and therefore descriptions of the same configurations will be omitted.

[0086] The abutment wall portion-side notch 94 is a notch provided in the lower side Z2 of the abutment wall portion 16a that abuts against the joint protrusion 23. The abutment wall portion-side notch 94 may be a notch provided in the upper side Z1 of the abutment wall portion 16a. As a result, even if foreign matter such as chips accumulates on the upper surface of the second extension portion 13b, the foreign matter that moves to the rotation restricting portion 16 as the joint protrusion 23 rotates is collected in the abutment wall portion-side notch 94. Therefore, the abutment between the abutment surface 23a of the joint protrusion 23 and the rotation restricting portion 16 is not hindered, and the valve cover 2 can be installed in a predetermined position. The abutment wall portion-side notch 94 may be provided on either the upper side Z1 or the lower side Z2.

[0087] Fifth Embodiment The joint protrusion 23 of the valve cover main body 20 according to the fifth embodiment will be described with reference to Figure 20. The joint protrusion 23 according to the fifth embodiment abuts against the rotation restricting portion 16 at the abutment point 23b. In this embodiment, the abutment point 23b is provided radially inward at the end of the joint protrusion 23 having the abutment surface 23a. As shown in Figure 20, the abutment surface 23a, including the abutment point 23b, on the outer surface of the joint protrusion 23 includes a portion that is spaced apart from the rotation restricting portion 16 in the radially outward direction from the abutment point 23b when the abutment point 23b and the rotation restricting portion 16 are in abutment. The other configurations are the same as those of the first embodiment, and therefore description of the similar configurations will be omitted.

[0088] 20 , when the abutment point 23b and the rotation restricting portion 16 are in contact with each other, the abutment surface 23a is partially spaced radially outward from the rotation restricting portion 16, so that a space 95 is formed between the rotation restricting portion 16 and the abutment surface 23a. Therefore, even if foreign matter such as chips has accumulated on the upper surface of the second extending portion 13b, the foreign matter that has moved to the rotation restricting portion 16 as the joining protrusion 23 rotates is collected in the space 95, and the abutment between the abutment point 23b and the rotation restricting portion 16 is not hindered.

[0089] Note that the abutment point 23b may be provided on the radially outer side of the end of the joint protrusion 23, and the abutment surface 23a may be spaced apart from the rotation restricting portion 16 in the radially inward direction. Furthermore, the abutment point 23b does not have to be at the end of the abutment surface 23a, and the abutment surface 23a may be configured to be spaced apart from the rotation restricting portion 16 as it moves radially inward and radially outward from the abutment point 23b. Furthermore, as shown in FIG. 21 , the abutment wall portion 16a of the rotation restricting portion 16 may be spaced apart from the abutment surface 23a of the joint protrusion 23 as it moves radially outward from the abutment point 23b. Even in this case, a space 96 is formed between the rotation restricting portion 16 and the abutment surface 23a, and therefore, foreign matter is not collected in the space 96, preventing the abutment between the abutment point 23b and the rotation restricting portion 16 from being hindered.

[0090] Other Embodiments In the above embodiment, the valve cover 2 is an example of a joining member, but the valve cover 2 may be a lid or inner plug that seals the opening 1H, or a tubular member for branching a flow path from the opening 1H. If these have a configuration similar to that of the lower member 21 of the valve cover 2 described above, they can be bayonet-joined to the opening 1H of the housing 1.

[0091] Furthermore, the configurations disclosed in the above embodiments can be applied in combination with configurations disclosed in other embodiments as long as no contradictions arise, and the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited to these, and can be modified as appropriate within the scope that does not deviate from the purpose of the present invention. [Industrial Applicability]

[0092] The present invention can be used in a fluid pipe connection device, a joining member, and an installation method for a fluid pipe connection device that can install a joining member in a predetermined position on a housing even if there are chips or foreign matter in the fitting groove of the housing. [Explanation of symbols]

[0093] 1: Housing 1H: Opening 2: Operculum 3: Valve body 5: Working valve 15: Fitting groove 16: Rotation restriction part 16a: Contact wall part 17: Regulation Department 23: Joint protrusion 23a: Contact surface 23b: Contact point 91: Notch on joining member side 92: Joint recess 93: Fitting groove side notch 94: Contact wall side notch 95: Space 96:Space 100: Fluid pipe connection device W:Fluid pipe

Claims

1. A fluid pipe connection device for connecting to a portion to be cut of a fluid pipe through which a fluid flows, a housing attached in close contact with the area to be cut; a joining member that is bayonet-joined to the opening of the housing, the opening has a fitting groove portion that can be fitted with a joining protrusion protruding from an outer peripheral surface of the joining member, and a rotation restricting portion that restricts rotation of the joining protrusion relative to the fitting groove portion, At least one of the opening and the joining member has a foreign matter recovery structure capable of recovering foreign matter generated by perforation of the portion of the fluid pipe to be cut.

2. the joint protrusion has a contact surface that contacts the rotation restricting portion, 2. The fluid pipe connection device according to claim 1, wherein the foreign matter recovery structure is a notch on the connecting member side provided on the contact surface.

3. the joint protrusion has a contact surface that contacts the rotation restricting portion, 2. The fluid pipe connecting device according to claim 1, wherein the foreign matter recovery structure is a joint recess provided on the outer circumferential surface, contiguous with the contact surface and on the same circumference as the joint protrusion.

4. 2. The fluid pipe connection device according to claim 1, wherein the foreign matter recovery structure is a notch provided in the fitting groove near the rotation restricting portion.

5. the rotation restricting portion has a contact wall portion that contacts the joint protrusion, 2. The fluid pipe connection device according to claim 1, wherein the foreign matter recovery structure is a notch provided on the abutting wall.

6. the joint protrusion has an abutment point that abuts against the rotation restricting portion and an abutment surface that includes the abutment point, the abutment surface includes a portion that is spaced apart from the rotation restricting portion in a radially outward direction or a radially inward direction from the abutment point when the rotation restricting portion and the abutment point are in abutment with each other, 2. The fluid pipe connection device according to claim 1, wherein the foreign matter recovery structure is a space surrounded by the rotation restricting portion and the portion.

7. The fluid pipe connection device according to any one of claims 1 to 6, wherein the joining member is a valve cover incorporating a valve body that can open and close the flow path of the fluid pipe, a lid or inner plug that seals the opening, or a pipe member.

8. 7. The fluid pipe connection device according to claim 1, wherein a connecting member is bayonet-connected to the opening of the housing.

9. A method for installing a fluid pipe connection device according to any one of claims 1 to 6, comprising: a housing installation process of attaching the housing to the portion of the fluid pipe to be cut in a tight contact state; an operating valve installation step of connecting a valve device having an operating valve to the opening of the housing; a drilling step of drilling a hole at the portion to be cut of the fluid pipe; a foreign matter removing step of removing the foreign matter generated by the perforation step; a joining step of bayonet-joining the joining member and the opening.

Images