Method for installing separable housing

Abstract

To provide a method for installing a separable housing which improves an efficiency in installation work.SOLUTION: In a method for installing a separable housing, a first housing 1 and a second housing 2 are bonded and installed in an existing pipe P1. The method for installing a separable housing includes: a suspending step of suspending the first housing 1 and the second housing 2 separated from the first housing 1 at the same time by one work machine S via a linear member W; a moving step of moving the first housing and the second housing 2 along a first direction by the one work machine S to the position at which the first housing 1 and the second housing 2 face each other with the existing pipe P1 therebetween; an installing step of installing the first housing 1 and the second housing 2 along an outer periphery of the existing pipe P1 in such a manner that first facing surfaces 12t, 13t of the first housing 1 and second facing surfaces 22t, 23t of the second housing 2 face each other; a temporary fastening step of temporary fastening the first housing 1 and the second housing 2; and a fully fastening step of fully fastening the first housing 1 and the second housing 2.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a split housing installation method. [Background technology]

[0002] Various techniques have been proposed for drilling holes in and branching fluid pipes such as water pipes (see, for example, Patent Document 1). Patent Document 1 discloses a method for attaching a branch case, which is made by joining two divided housings into an annular shape, to the outer periphery of a water pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-166628 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the branch case installation method disclosed in Patent Document 1, a temporary assembly in which one of the two split housings is temporarily assembled with a gate valve is lifted by equipment such as a crane and placed over a water pipe, and then one of the split pieces and the other split piece placed below the water pipe are fastened together by a fastener. In the above installation method, the one of the split pieces and the other split piece are lifted separately by equipment and placed around the water pipe, which reduces the efficiency of the construction work.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a split housing installation method that improves the efficiency of construction work. [Means for solving the problem]

[0006] The feature of the split housing installation method of the present invention is that, in the split housing installation method for joining a first housing and a second housing and installing them on an existing pipe, the method includes a hanging process in which the first housing and the second housing separated from the first housing are simultaneously hung by one work machine via a linear member, a moving process in which the first housing and the second housing are moved along a first direction by the one work machine to a position where the first housing and the second housing face each other across the existing pipe, an arrangement process in which a first opposing surface of the first housing faces a second opposing surface of the second housing and the first housing and the second housing are arranged along the outer periphery of the existing pipe, a temporary fastening process in which the first housing and the second housing are temporarily fastened together, and a final fastening process in which the first housing and the second housing are finally fastened together.

[0007] According to this feature, the first housing and the second housing separated from the first housing by the hanging process, the moving process, and the arranging process are simultaneously hung by one work machine via a linear member and arranged along the outer periphery of the existing pipe. Then, the first housing and the second housing are temporarily fastened to align them, and then the first housing and the second housing are fully fastened to install the split housing on the existing pipe. In other words, the split housing can be installed on the existing pipe using one work machine. Therefore, work efficiency is improved compared to the case where the first housing and the second housing are hung separately and arranged along the outer periphery of the existing pipe.

[0008] As another feature, the method further includes a rotation process of rotating the first housing and the second housing along the outer periphery of the existing pipe so that the first opposing surface and the second opposing surface intersect with the first direction, and the rotation process may be performed between the temporary tightening process and the final tightening process.

[0009] According to this feature, the rotating step is performed after the temporary fastening step. This rotating step makes it possible to freely change the position of the cut surface of the divided housings. In this way, by rotating the temporarily fastened first housing and second housing together, work efficiency is improved regardless of the position of the cut surface.

[0010] As another feature, in the moving process, the existing pipe may be passed between the first housing and the second housing by bringing the first housing and the second housing into contact with the existing pipe.

[0011] According to this feature, by utilizing contact with the existing pipe, a distance between the first and second housings that allows the existing pipe to pass can be easily secured, eliminating the need to precisely secure the separation distance between the first and second housings to match the size of the existing pipe, thereby improving work efficiency.

[0012] As another feature, the linear member includes a first wire connected to the first housing via a first hanging device, a second wire connected to the second housing via a second hanging device, and a third wire having one end connected to the first wire and the second wire via a third hanging device and the other end connected to the work machine, and during the hanging process, the first housing and the second housing may face each other with the linear member in between.

[0013] According to this feature, the first housing and the second housing can be suspended by a single work machine via the linear members (first wire, second wire, and third wire), making it highly versatile and usable in any work site.

[0014] As another feature, the method further includes a branch pipe insertion process of inserting a branch pipe that branches the fluid flowing through the existing pipe into an opening formed between the first housing and the second housing, and the branch pipe insertion process may be performed between the temporary tightening process and the final tightening process.

[0015] According to this feature, since the branch pipe inserting step is performed between the temporary fastening step and the final fastening step, it is possible to insert the branch pipe into the opening after the first housing and the second housing are temporarily fastened and aligned. For example, this improves work efficiency compared to inserting the branch pipe while aligning the first housing and the second housing in a separated state. [Brief description of the drawings]

[0016] [Figure 1] FIG. 4 is a flow chart showing a method for installing the divided housings in the first embodiment. [Diagram 2] FIG. 4 is a diagram showing a hanging step according to the first embodiment. [Diagram 3] FIG. 4 is a diagram showing a moving process according to the first embodiment. [Figure 4] FIG. 2 is a diagram showing an arrangement step according to the first embodiment. [Diagram 5] 4A to 4C are diagrams illustrating a temporary fastening step according to the first embodiment. [Figure 6] 4A to 4C are diagrams showing a removal process according to the first embodiment. [Figure 7] FIG. 4 is a diagram showing a rotating step according to the first embodiment. [Figure 8] 6A to 6C are diagrams showing a branch pipe inserting step according to the first embodiment. [Figure 9] FIG. 4 is a diagram showing a final tightening step according to the first embodiment. [Figure 10] FIG. 11 is a flow diagram showing a split housing installation method according to the second embodiment. [Figure 11] FIG. 11 is a diagram showing a hanging step according to the second embodiment. [Figure 12] FIG. 11 is a diagram showing a moving process according to the second embodiment. [Figure 13] FIG. 11 is a diagram showing an arrangement step according to the second embodiment. [Figure 14] 11 is a diagram showing a temporary fastening step according to the second embodiment. FIG. [Figure 15] 11A to 11C are diagrams showing a removal process according to the second embodiment. [Figure 16] 10A and 10B are diagrams illustrating a branch pipe inserting step according to the second embodiment. [Figure 17] 11A and 11B are diagrams illustrating a rotating process and a final tightening process according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] [Embodiment 1] Hereinafter, with reference to the drawings, a method for installing a split housing according to an embodiment of the present invention will be described, taking as an example a method for installing a split housing as a split T-shaped pipe used for branching a fluid. However, the present invention is not limited to the following embodiment, and various modifications are possible within the scope of the present invention. The split T-shaped pipe may also be called a branch case.

[0018] [How to install split enclosures] First, the split housing installation method S10 will be described with reference to Figs. 1 to 9. Fig. 1 is a flow diagram showing the split housing installation method S10, and Figs. 2 to 9 are diagrams showing the steps of the split housing installation method S10. The split housing installation method S10 is a method of joining a first housing 1 and a second housing 2 to form a split housing 10 and installing the split housing 10 in an existing pipe P1. The split housing installation method S10 can be performed in an uninterrupted flow state while maintaining the flow of a fluid flowing through the existing pipe P1. In this embodiment, the fluid is water, and the existing pipe P1 is a water pipe buried in the ground and extends along the horizontal direction. Hereinafter, the horizontal direction in which the existing pipe P1 extends is referred to as the "X direction", and the direction perpendicular to the X direction is referred to as the "Y direction" (see Fig. 2). In addition, the direction perpendicular to the X direction and the Y direction (vertical direction) is referred to as the "Z direction". Furthermore, one side of the Z direction (vertical direction) (vertical lower side) is defined as the “Z1 side”, and the other side (vertical upper side) is defined as the “Z2 side”. Note that the direction from the Z2 side to the Z1 side corresponds to the first direction.

[0019] As shown in FIG. 1, the split housing installation method S10 includes, in this order, a hanging process S1 (see FIG. 2), a moving process S2 (see FIG. 3), a placement process S3 (see FIG. 4), a temporary tightening process S4 (see FIG. 5), a removal process S5 (see FIG. 6), a rotation process S6 (see FIG. 7), a branch pipe insertion process S7 (see FIG. 8), and a final tightening process S8 (see FIG. 9).

[0020] [Hanging process] 2, in the lifting process S1, the first housing 1 and the second housing 2 separated from the first housing 1 are lifted simultaneously by one working machine S via a wire part W (an example of a linear member). The working machine S is, for example, a crane.

[0021] [First cabinet] The first housing 1 has a semi-cylindrical first main body portion 11 extending in the X direction, a first flange portion 12 extending radially outward from the first main body portion 11, a second flange portion 13 extending from the first main body portion 11 on the side opposite the first flange portion 12, a first branch pipe portion 14 extending from the first main body portion 11 on the same side as the second flange portion 13, and a cylindrical tubular portion 15 extending from the first main body portion 11 in a direction perpendicular to the first main body portion 11 and the first branch pipe portion 14.

[0022] The first flange portion 12 includes a first flange 12f that protrudes radially outward from one end of the first main body portion 11. The first flange 12f is disposed on the side opposite to the side of the first housing 1 that is connected to the wire portion W. The first flange 12f is formed with a first fastening hole 12h that penetrates the first flange 12f and through which a fastening member such as a bolt can be inserted. The first flange 12f also includes a first split surface 12t (an example of a first opposing surface) that faces (contacts) the second housing 2 when the split housing 10 is constructed (see FIG. 9).

[0023] The second flange portion 13 includes a second flange 13f that protrudes radially outward from the other end of the first main body portion 11. The second flange 13f is disposed on the side that is connected to the wire portion W. The second flange 13f is formed with a first metal fitting hole 13h and a second fastening hole 13j that penetrate the second flange 13f. A metal fitting or the like described below can be inserted into the first metal fitting hole 13h. A fastening member can be inserted into the second fastening hole 13j. The second flange 13f also includes a second split surface 13t (an example of a first opposing surface) that faces (contacts) the second housing 2 when the split housing 10 is constructed (see FIG. 9).

[0024] A semicircular first opening 14h is formed in the first branch pipe portion 14. A circular cylindrical opening 15h is formed in the tubular portion 15. A cutter (not shown) of a cutting device (drilling machine) for cutting (drilling) the existing pipe P1 is inserted into the cylindrical opening 15h.

[0025] [Second housing] The second housing 2 has a configuration substantially similar to that of the first housing 1, except that it does not have the cylindrical portion 15. In detail, the second housing 2 has a semi-cylindrical second main body portion 21 extending in the X direction, a third flange portion 22 extending radially outward from the second main body portion 21, a fourth flange portion 23 extending from the second main body portion 21 to the opposite side to the third flange portion 22, and a second branch pipe portion 24 extending from the second main body portion 21 to the same side as the fourth flange portion 23.

[0026] The third flange portion 22 includes a third flange 22f that protrudes radially outward from one end of the second main body portion 21. The third flange 22f is disposed on the side opposite to the side connected to the wire portion W. The third flange 22f is formed with a third fastening hole 22h that penetrates the third flange 22f and through which a fastening member such as a bolt can be inserted. The third flange 22f also includes a third split surface 22t (an example of a second opposing surface) that faces (contacts) the first housing 1 when the split housing 10 is constructed (see FIG. 9).

[0027] The fourth flange portion 23 includes a fourth flange 23f that protrudes radially outward from the other end of the second main body portion 21. The fourth flange 23f is disposed on the side that is connected to the wire portion W. The fourth flange 23f is formed with a second metal fitting hole 23h and a fourth fastening hole 23j that penetrate the fourth flange 23f. A metal fitting or the like can be inserted into the second metal fitting hole 23h. A fastening member can be inserted into the fourth fastening hole 23j. The fourth flange 23f also includes a fourth split surface 23t (an example of a second opposing surface) that faces (contacts) the first housing 1 when the split housing 10 is constructed.

[0028] A semicircular second opening 24h is formed in the second branch pipe section 24. When the split housing 10 is constructed, the second branch pipe section 24 forms a circular opening 1h together with the first branch pipe section 14 of the first housing 1, and a part of the branch pipe P2 is inserted into the opening 1h (see FIG. 9).

[0029] [Wire section] The wire portion W has a first wire W1, a second wire W2, and a third wire W3. In this embodiment, the first wire W1 is connected to the second flange portion 13 of the first housing 1. More specifically, the first wire W1 is connected to the first housing 1 via a first hanging fitting K1 (an example of a first hanging tool) that engages with a first fitting hole 13h formed in the second flange 13f.

[0030] In this embodiment, the second wire W2 is connected to the fourth flange portion 23 of the second housing 2. The second wire W2 is connected to the second housing 2 via a second hanging fitting K2 (an example of a second hanging tool) that engages with a second metal fitting hole 23h formed in the fourth flange 23f. In this embodiment, the second flange portion 13 (first metal fitting hole 13h) and the fourth flange portion 23 (second metal fitting hole 23h) function as the suspended portion 10t.

[0031] The third wire W3 has one end connected to the first wire W1 and the second wire W2 via a third hanging fitting K3 (an example of a third hanging tool), and the other end connected to the work machine S (a fitting arranged at the tip of the work machine S).

[0032] In this embodiment, each of the first suspending fitting K1, the second suspending fitting K2, and the third suspending fitting K3 is formed, for example, by a shackle, a hook, etc. In the following, the first suspending fitting K1, the second suspending fitting K2, and the third suspending fitting K3 may be collectively referred to as "suspending fittings K."

[0033] The first housing 1 connected to the wire portion W as described above is suspended in a position in which the second flange portion 13 is closer to the third wire W3 and the first flange portion 12 is farther from the third wire W3. The second housing 2 connected to the wire portion W as described above is suspended in a position in which the fourth flange portion 23 is closer to the third wire W3 and the third flange portion 22 is farther from the third wire W3.

[0034] The first housing 1 and the second housing 2 suspended by the working machine S are separated from each other and face each other with the wire part W in between. In this embodiment, the first housing 1 and the second housing 2 are suspended by the working machine S in such a posture that the second cut surface 13t and the fourth cut surface 23t are line-symmetrical with respect to the imaginary line L as the axis of symmetry, and the first cut surface 12t and the third cut surface 22t are line-symmetrical with respect to the imaginary line L as the axis of symmetry. The imaginary line L is an extension of the third wire W3. In the example shown in FIG. 2, the first housing 1 and the second housing 2 are separated by a certain distance, but this separation can be achieved by using a tension rod or guidance by a worker. In addition, the first housing 1 and the second housing 2 may be suspended to the extent that they come into contact with each other, and in the moving process S2 described below, at least one of the first flange portion 12 and the third flange portion 22 will come into contact with the arc-shaped upper surface of the existing pipe P1, causing the first housing 1 and the second housing 2 to naturally separate.

[0035] When the first housing 1 and the second housing 2 are suspended from the working machine S via the wire portion W, the suspension step S1 ends and the moving step S2 is performed.

[0036] [Moving process] As shown in FIG. 2 and FIG. 3, in the moving step S2, the first housing 1 and the second housing 2 suspended in the suspending step S1 are moved toward the Z1 side by the work machine S. More specifically, the first housing 1 and the second housing 2 are moved to a position where the first housing 1 and the second housing 2 face each other with the existing pipe P1 in between. At this time, at least one of the first flange portion 12 and the third flange portion 22 contacts the arc-shaped upper surface of the existing pipe P1. As a result, the first housing 1 and the second housing 2 are separated by a distance that allows the existing pipe P1 to pass through, and the existing pipe P1 can pass between the first housing 1 and the second housing 2. When the first housing 1 and the second housing 2 are moved to a position where they face each other with the existing pipe P1 in between, the moving step S2 is completed, and the arrangement step S3 is performed.

[0037] [Placement process] As shown in Fig. 3 and Fig. 4, in the arrangement process S3, the first housing 1 (first main body portion 11) and the second housing 2 (second main body portion 21), which have been moved to a position where they face each other across the existing pipe P1 in the movement process S2, are arranged along the outer periphery of the existing pipe P1. In detail, the first flange portion 12 (first flange 12f) and the third flange portion 22 (third flange 22f) are arranged to face each other across the existing pipe P1, and the second flange portion 13 (second flange 13f) and the fourth flange portion 23 (fourth flange 23f) are arranged to face each other across the existing pipe P1. This ends the arrangement process S3, and the temporary tightening process S4 is performed.

[0038] The first cutting surface 12t, the second cutting surface 13t, the third cutting surface 22t, and the fourth cutting surface 23t at the end of the arrangement step S3 are planes intersecting with the Y direction, the first cutting surface 12t and the third cutting surface 22t face each other in the Y direction, and the second cutting surface 13t and the fourth cutting surface 23t face each other in the Y direction. The second flange portion 13 of the first housing 1 and the fourth flange portion 23 of the second housing 2 are disposed in a position closer to the wire portion W than the existing pipe P1 in the Z direction, and the first flange portion 12 of the first housing 1 and the third flange portion 22 of the second housing 2 are disposed in a position farther from the wire portion W than the existing pipe P1.

[0039] [Temporary tightening process] 5, in the temporary fastening step S4, the first housing 1 and the second housing 2 arranged along the outer periphery of the existing pipe P1 in the arrangement step S3 are temporarily fastened. The first housing 1 and the second housing 2 are temporarily fastened by temporarily fastening the first flange portion 12 and the third flange portion 22 with a fastening member. For example, the first housing 1 and the second housing 2 are temporarily fastened by temporarily fastening a nut to a bolt (e.g., a headed bolt (T-head bolt)) inserted into the first fastening hole 12h of the first flange portion 12 and the third fastening hole 22h of the third flange portion 22, and temporarily fastening a nut to a fully threaded bolt inserted into the second fastening hole 13j of the second flange portion 13 and the fourth fastening hole 23j of the fourth flange portion 23, etc. In this embodiment, the first flange portion 12 (first fastening hole 12h), the third flange portion 22 (third fastening hole 22h), the second flange portion 13 (second fastening hole 13j), and the fourth flange portion 23 (fourth fastening hole 23j) function as temporary fastening portions.

[0040] The first housing 1 and the second housing 2 are temporarily fastened so that they will not separate even when rotated about the tube axis PX in a rotation step S6 described later. Also, the first housing 1 and the second housing 2 are temporarily fastened so that the second flange portion 13 and the fourth flange portion 23 are movable (can move close to or apart from each other).

[0041] When the first housing 1 and the second housing 2 are temporarily fastened to each other, the temporary fastening step S4 is completed, and a removal step S5 is performed.

[0042] [Removal process] 5 and 6, in the removal process S5, the wire portion W is removed from the first housing 1 and the second housing 2 that were temporarily fastened in the temporary fastening process S4. More specifically, the first hanging fitting K1 and the first wire W1 are removed from the first housing 1, and the second hanging fitting K2 and the second wire W2 are removed from the second housing 2. This ends the removal process S5, and the rotation process S6 is performed.

[0043] [Rotation process] Next, as shown in Figs. 6 and 7, in the rotating step S6, the first housing 1 and the second housing 2 from which the wire portion W has been removed in the removing step S5 are rotated along the outer periphery of the existing pipe P1. More specifically, the first housing 1 and the second housing 2 are rotated together with the pipe axis PX of the existing pipe P1 as the rotation axis. In the example shown in Fig. 6, the first housing 1 and the second housing 2 are rotated about 90 degrees counterclockwise so that the first cut surface 12t, the second cut surface 13t, the third cut surface 22t, and the fourth cut surface 23t intersect (for example, perpendicular to) the Z direction. This rotating step S6 can be easily performed by an operator because the weight of the divided housing 10 is supported by the existing pipe P1. This ends the rotating step S6, and the branch pipe inserting step S7 is performed.

[0044] [Branch pipe insertion process] Next, as shown in Fig. 8, in the branch pipe inserting step S7, a branch pipe P2 for branching a fluid flowing through an existing pipe P1 is inserted into the first housing 1 and the second housing 2 rotated in the rotating step S6. More specifically, in the temporary fastening step S4, the second flange portion 13 of the first housing 1 and the fourth flange portion 23 of the second housing 2 are separated from each other by a distance corresponding to the looseness (interval) of the temporarily fastened fastening members (fully threaded bolt and nut). After that, a part of the branch pipe P2 is inserted between the first housing 1 and the second housing 2 through the opening 1h formed between the first housing 1 and the second housing 2. This ends the branch pipe inserting step S7, and the final fastening step S8 is performed.

[0045] [Final tightening process] Next, as shown in FIG. 9, in the final fastening step S8, the first housing 1 and the second housing 2 into which the branch pipe P2 has been inserted in the branch pipe insertion step S7 are final fastened by using a ratchet or the like. In detail, the temporary fastening fully threaded bolts temporarily fastened to the second flange portion 13 of the first housing 1 and the fourth flange portion 23 of the second housing 2 are replaced with bolts (headed bolts) and final fastened, and the bolts temporarily fastened to the first flange portion 12 and the third flange portion 22 are final fastened. When the first housing 1 and the second housing 2 are final fastened, the split housing 10 is constructed, and the attachment of the split housing 10 to the existing pipe P1 is completed. This ends the final fastening step S8, and the split housing installation work (split housing installation method S10) is completed. In the split housing 10, the branch pipe P2 is fixed so that the fluid (for example, the fluid branched from the existing pipe P1 to the branch pipe P2) does not leak out.

[0046] The split housing 10 according to this embodiment is used in the half-cut method, and when the split housing 10 is installed on the existing pipe P1, the opening axis H1 of the cylindrical opening 15h of the cylindrical part 15 is offset from the pipe axis PX of the existing pipe P1 toward the branch pipe P2. That is, in the half-cut method, the cutter passing through the cylindrical opening 15h is offset from the pipe axis PX of the existing pipe P1. That is, the existing pipe P1 is cut at a position offset from the pipe axis PX toward the branch pipe P2. Note that in the half-cut method, the existing pipe P1 is not completely separated, and a part of the existing pipe P1 remains connected.

[0047] [Embodiment 2] Next, a split housing installation method S20 according to embodiment 2 will be described with reference to Fig. 10 to Fig. 16. In embodiment 2, the timing of performing the branch pipe inserting step S7 is different from embodiment 1. Note that, in the following, the same components as those in embodiment 1 are denoted by the same reference numerals and detailed description of the same components as those in embodiment 1 will be omitted.

[0048] As shown in FIG. 10, in this embodiment, the branch pipe inserting step S7 is performed before the rotating step S6, not after the rotating step S6.

[0049] That is, in the second embodiment, the split housing installation method S10 includes, in this order, a hanging process S1 (see FIG. 11), a moving process S2 (see FIG. 12), an arrangement process S3 (see FIG. 13), a temporary fastening process S4 (see FIG. 14), a removal process S5 (see FIG. 15), a branch pipe insertion process S7 (see FIG. 16), a rotation process S6 (see FIG. 17), and a final fastening process S8 (see FIG. 17). The contents of each process are the same as those in the first embodiment, and therefore detailed explanations will be omitted.

[0050] In this embodiment, the split housing 10 is used in the full-cut method, and has a different configuration from the split housing 10 described in the first embodiment. In detail, as shown in Fig. 17, the opening axis H1 of the cylindrical opening 15h of the cylindrical part 15 is not offset with respect to the pipe axis PX of the existing pipe P1, unlike the split housing 10 used in the half-cut method. In other words, in the full-cut method, the cutter cuts the existing pipe P1 without offsetting with respect to the pipe axis PX of the existing pipe P1, and the existing pipe P1 is completely separated through the cut portion.

[0051] 12, in this embodiment, the suspended portion 10t is composed of a first engagement hole 14t formed in the first branch pipe portion 14 and a second engagement hole 24t formed in the second branch pipe portion 24. A shackle or the like engaged with each of the first engagement hole 14t and the second engagement hole 24t is engaged with a hook or the like connected to the tip of the wire portion W, thereby connecting the first housing 1 and the second housing 2 to the wire portion W.

[0052] [Effects of the embodiment] (1) As described above, according to the above embodiment, the first housing 1 and the second housing 2 spaced apart from the first housing 1 are simultaneously suspended by one work machine S (crane) via the wire part W and arranged along the outer periphery of the existing pipe P1. Therefore, work efficiency is improved compared to the case where the first housing 1 and the second housing 2 are suspended separately and arranged along the outer periphery of the existing pipe P1.

[0053] (2) In the above embodiment, the first housing 1 and the second housing 2 that are temporarily fastened can be rotated together in the rotating step S6, which improves work efficiency.

[0054] (3) Furthermore, in the above embodiment, the first housing 1 and the second housing 2 can be suspended by a single work machine S via the wire portion W (first wire W1, second wire W2 and third wire W3), thereby improving work efficiency.

[0055] (4) Furthermore, in the above embodiment, the branch pipe insertion process S7 is performed between the preliminary tightening process S4 and the final tightening process S8. This improves work efficiency compared to, for example, inserting a branch pipe when the first housing 1 and the second housing 2 are separated.

[0056] [Another embodiment] The present invention may be configured as follows other than the above-described embodiment (common numbers and symbols as in the embodiment are used to designate components having the same functions as in the embodiment).

[0057] (1) The split casing installation method S10 described in embodiment 1 (a method in which the branch pipe insertion process S7 is performed between the rotation process S6 and the final tightening process S8) is also applicable to the split casing 10 used in the full-cut method described in embodiment 2. Moreover, the split casing installation method S20 described in embodiment 2 (a method in which the branch pipe insertion process S7 is performed between the removal process S5 and the rotation process S6) is also applicable to the split casing 10 used in the half-cut method described in embodiment 1.

[0058] (2) In the above embodiment, the split housing installation methods S10 and S20 include the rotation step S6. However, for example, when installing a split housing whose cleavage surface is in the vertical direction, the rotation step S6 is omitted.

[0059] (3) In the above embodiment, the split housing installation methods S10 and S20 included a branch pipe insertion step S7. However, for example, when a valve (shutoff valve) or the like is to be installed in an existing pipe P1 (in the case of a split housing in which the first housing 1 does not have the first branch pipe section 14 and the second housing 2 does not have the second branch pipe section 24), the branch pipe insertion step S7 is omitted.

[0060] (4) A separating tool or the like may be detachably attached between the first housing 1 and the second housing 2, so that the first housing 1 and the second housing 2 are spaced apart to an extent that the existing pipe P1 can pass between them. In this case, the first housing 1 and the second housing 2 do not need to be brought into contact with the existing pipe P1 in the moving step S2.

[0061] (5) In the provisional fastening step S4 of the above embodiment, the first housing 1 and the second housing 2 are provisionally fastened by provisionally fastening a nut to a bolt (e.g., a T-head bolt) inserted through the first fastening hole 12h of the first flange portion 12 and the third fastening hole 22h of the third flange portion 22, and provisionally fastening a nut to a fully threaded bolt inserted through the second fastening hole 13j of the second flange portion 13 and the fourth fastening hole 23j of the fourth flange portion 23, but the first housing 1 and the second housing 2 may be provisionally fastened by provisionally fastening only the first flange portion 12 (the first fastening hole 12h) and the third flange portion 22 (the third fastening hole 22h) with a fastening member. Alternatively, the first housing 1 and the second housing 2 may be provisionally fastened by provisionally fastening the second flange portion 13 (the second fastening hole 13j) and the fourth flange portion 23 (the fourth fastening hole 23j) with a fastening member. Furthermore, the type of fastening member used for temporary fastening can be changed as appropriate.

[0062] (6) The number of hanging fittings K used when hanging the split housing 10 by the wire portion W can be changed as appropriate.

[0063] (7) In the above embodiment, the first housing 1 and the second housing 2 are hung from the work machine S in such a manner that the second cutting surface 13t and the fourth cutting surface 23t are symmetrical about the virtual line L extending from the third wire W3, but the second cutting surface 13t and the fourth cutting surface 23t do not have to be symmetrical about the virtual line L extending from the third wire W3, and may be positioned differently from each other in the Z direction, for example. The same applies to the first cutting surface 12t and the third cutting surface 22t.

[0064] (8) In the above embodiment, the wire portion W is described as an example of a linear member, but the linear member may be a rope, a chain, etc. other than a wire. Also, the suspending metal fitting K may be a connector capable of connecting the wire portion W to the first housing 1 and the second housing 2 other than a shackle or a hook.

[0065] (9) In the above embodiment, the fluid is water and the existing pipe P1 is a water pipe. However, the present invention may be applied to a fluid pipe through which other fluids flow.

[0066] (10) In the above embodiment, the branch pipe inserting step S7 is performed after the removing step S5. However, the branch pipe inserting step S7 may be performed before the removing step S5.

[0067] (11) In the split housing installation methods S10 and S20 described in the above embodiment, only a temporary assembly formed by integrating the first housing 1 and the branch pipe P2 may be suspended in the suspension step S1. In this case, the temporary fastening step S4, the rotation step S6, and the branch pipe insertion step S7 are omitted, and the second housing 2 is disposed in advance on the Z1 side of the existing pipe P1. [Industrial Applicability]

[0068] The present invention can be used in a split housing installation method. [Explanation of symbols]

[0069] 1: First unit 1h: opening 2: Second housing 10: Split case 12t: 1st split surface (1st opposing surface) 13t: 2nd split surface (1st opposing surface) 22t: 3rd split surface (2nd opposing surface) 23t: 4th section surface (2nd opposing surface) K: Hanging hardware K1: First hanging bracket K2: Second hanging bracket K3: 3rd suspension bracket P1: Existing pipe P2: Branch pipe S: Work equipment S1: Hanging process S2: Moving process S3: Placement process S4: Temporary fastening process S6: Rotation process S7: Branch pipe insertion process S8: Final tightening process K1: First suspension bracket (first suspension tool) K2: Second hanging bracket (second hanging tool) K3: Third suspension bracket (third suspension tool) W: Wire part (linear member) W1: First wire W2: Second wire W3: Third wire

Claims

1. A split housing installation method for joining a first housing and a second housing and installing them on an existing pipe, comprising the steps of: a suspending step of suspending the first housing and the second housing separated from the first housing by one working machine via a linear member; a moving step of moving the first housing and the second housing along a first direction by one of the work machines to a position where the first housing and the second housing face each other across the existing pipe; an arrangement process of arranging the first housing and the second housing so that a first opposing surface of the first housing faces a second opposing surface of the second housing and the first housing and the second housing are arranged along an outer periphery of the existing pipe; a temporary fastening process of temporarily fastening the first housing and the second housing; and a final tightening step of final tightening the first housing and the second housing.

2. The method further includes a rotating step of rotating the first housing and the second housing along an outer periphery of the existing pipe so that the first opposing surface and the second opposing surface intersect with the first direction, The split housing installation method according to claim 1 , wherein the rotating step is performed between the temporary fastening step and the final fastening step.

3. The split housing installation method according to claim 1 or 2, wherein in the moving process, the first housing and the second housing are brought into contact with the existing pipe, thereby passing the existing pipe between the first housing and the second housing.

4. the linear member includes a first wire connected to the first housing via a first suspender, a second wire connected to the second housing via a second suspender, and a third wire having one end connected to the first wire and the second wire via a third suspender and the other end connected to the work machine, The split housing installation method according to claim 1 or 2, wherein in the hanging step, the first housing and the second housing face each other with the linear member interposed therebetween.

5. The method further includes a branch pipe inserting step of inserting a branch pipe, which branches a fluid flowing through the existing pipe, into an opening formed between the first housing and the second housing, The split housing installation method according to claim 1 or 2, wherein the branch pipe inserting step is performed between the temporary fastening step and the final fastening step.

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