Continuous Flow Method

Abstract

To provide an uninterrupted flow construction method which enables easy construction.SOLUTION: An uninterrupted flow construction method includes: a lower housing arrangement step in which a lower housing 30, forming a housing 10 which can be divided vertically, is arranged relative to a fluid pipe 2, forming a passage, by using jacks 4, 4 having a height adjustment function and a load support function; a connection step in which an upper housing 20, forming the housing 10, is placed on and connected to the lower housing 30; a positioning step in which the lower housing 30 and the upper housing 20, connected to each other, are positioned relative to the fluid pipe 2 by using positioning means 10C, 10C; and a sealing step in which a space between the housing 10 and the fluid pipe 2 is sealed.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a flow-uninterrupted construction method involving the cutting of a fluid pipe. [Background technology]

[0002] In existing flow paths through which water, gas, etc. flow, a flow-uninterrupting construction method is known in which at least a portion of the fluid pipe is removed in order to replace part of the existing fluid pipe with a new fluid pipe or to connect to other flow paths in order to deal with deterioration over time or to form a new branch path.

[0003] For example, the flow uninterrupted method shown in Patent Document 1 is used when installing a gate valve midway in a fluid pipe in an existing flow path, in which a housing consisting of an upper housing and a lower housing is fitted hermetically onto the fluid pipe, a part of the fluid pipe is cut off through the opening of the housing while maintaining the hermetic state, a gate valve is inserted and installed between one end and the other end of the cut fluid pipe inside the housing while maintaining the hermetic state, and the opening of the housing is sealed with a gate valve cover. This allows the housing to be used as a flow path component that functions as part of the flow path, making it possible to simply install the gate valve.

[0004] In addition, as the above-mentioned uninterrupted flow method, for example, a T-shaped housing is used, and a housing consisting of an upper housing and a lower housing is fitted onto the fluid pipe constituting the existing flow path in a sealed manner, a branch pipe is connected to the housing, and the fluid pipe is cut off and the opening of the housing is sealed as described above, thereby connecting the branch pipe to the existing flow path. In this way, the configuration of the housing used as the flow path component is appropriately changed depending on the uninterrupted flow method to be implemented. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2006-132715 A (pages 9 to 12, Figure 16) Summary of the Invention [Problem to be solved by the invention]

[0006] In the uninterrupted flow method described in Patent Document 1, the fluid pipe and the housing are aligned and a sealing member is press-fitted between them, thereby enabling stable sealing in the circumferential direction.

[0007] In detail, the alignment between the fluid pipe and the housing is performed by placing the lower housing on the H-shaped steel and aligning the upper housing, which is temporarily fixed to the lower housing, with the fluid pipe. For example, if the height of the H-shaped steel is lower than the desired position, the position of the lower housing is raised by driving a wedge-shaped member between the H-shaped steel and the lower housing, or by placing a square timber or plate under the H-shaped steel. However, if the height of the H-shaped steel is higher than the desired position, the H-shaped steel needs to be replaced with one with a shorter dimension, so the temporary fixation of the upper and lower housings must be released and removed, which increases the number of work steps.

[0008] The present invention has been made in consideration of such problems, and has as its object to provide a method of construction without interrupting flow that is easy to carry out. [Means for solving the problem]

[0009] In order to solve the above problems, the flow-uninterrupted construction method of the present invention is as follows: a lower housing arrangement process for arranging a lower housing constituting a housing that can be separated into upper and lower parts, relative to a fluid pipe that constitutes a flow path, using a jack having a height adjustment function and a load support function; a connecting step of placing and connecting an upper housing constituting the housing to the lower housing; a position adjustment step of aligning the lower housing and the upper housing connected to each other with respect to the fluid pipe using a position adjustment means; and a sealing step of sealing between the housing and the fluid pipe. According to this feature, the connected lower and upper housings can be positioned with sufficient movement relative to the fluid pipe, which allows the housings to be reliably aligned with the fluid pipe, simplifying installation.

[0010] The lower housing arrangement step is characterized in that the lower housing in contact with the fluid pipe is supported by the jack. According to this feature, the lower housing can be held safely.

[0011] In the position adjustment step, after the upper housing and the lower housing which are connected to each other are suspended by a crane, the jack is moved away from the lower housing. According to this feature, travel expenses can be secured safely and easily.

[0012] In the position adjusting step, the position adjustment is performed using an adjustment bolt and a crane provided on the housing, which are the position adjusting means. According to this feature, by supporting the housings with a crane, it is possible to easily perform precise alignment of the connected upper and lower housings with respect to the fluid pipes.

[0013] The upper and lower housings are characterized in that the adjustment bolts are provided thereon. According to this feature, the adjustment bolt can be provided with a simple structure.

[0014] The jack is characterized in that a plurality of the jacks are arranged at intervals in the axial direction of the fluid pipe. According to this feature, even if the fluid pipe is inclined, it is possible to position the fluid pipe in accordance with the inclination.

[0015] At least one of the jacks is characterized in that it is disposed at a position spaced apart from the axis of the fluid pipe. According to this feature, it is possible to prevent the housing from rotating about the axial direction of the fluid pipe. [Brief description of the drawings]

[0016] [Figure 1] 1 is a partially cutaway front view showing a state in which a lower housing is arranged in the undisrupted flow construction method in Example 1. FIG. [Diagram 2] FIG. 1A is a bottom view for explaining the arrangement of the jack, and FIG. [Diagram 3] 13 is a front view showing a state in which the upper housing is temporarily fixed to the lower housing. FIG. [Figure 4] 13A and 13B are diagrams for explaining alignment of the lower housing and the upper housing with respect to the fluid pipe by using a jack. [Diagram 5] 13A and 13B are diagrams for explaining alignment of the lower and upper housings with respect to the fluid pipe by an adjustment bolt of the upper housing. [Figure 6] 13A and 13B are diagrams for explaining alignment of the lower and upper housings with respect to the fluid pipe by an adjustment bolt of the lower housing. [Figure 7] 1 is a partially cutaway front view showing a state in which a housing is fitted hermetically around a fluid pipe. FIG. [Figure 8] FIG. 13 is a front view showing a state in which a part of the housing is embedded in concrete. [Figure 9] FIG. 2 is a partially cutaway front view showing the operating valve attached to the housing. [Figure 10] 11 is a partially cutaway front view showing a state in which a portion of a fluid pipe has been cut off using a cutting device. FIG. [Figure 11] FIG. 2 is a front view, partially cut away, showing the state at the start of inserting a butterfly valve using an insertion device. [Figure 12] FIG. 2 is a partially cutaway front view showing the butterfly valve after installation. [Figure 13] FIG. 11 is a front view for explaining a flow-undisrupted construction method in the second embodiment. [Figure 14]FIG. 11 is a bottom view for explaining the arrangement of the jack in the second embodiment. [Figure 15] FIG. 11 is a partially cutaway front view illustrating the flow-undisrupted construction method in the third embodiment. [Figure 16] FIG. 13(a) is a side view for explaining the jack and the arrangement of the jack in the third embodiment, and FIG. 13(b) is a bottom view for explaining the arrangement of the jack in the third embodiment. [Figure 17] FIG. 13 is a front view for explaining the flow-undisrupted construction method in the fourth embodiment. [Figure 18] 18 is a cross-sectional view taken along the line AA in FIG. 17. [Figure 19] FIG. 13 is a front view for explaining a jack in a fourth embodiment. [Figure 20] FIG. 13 is a front view for explaining another embodiment of the flow-undisrupted construction method in the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment for carrying out the flow-uninterrupted construction method according to the present invention will be described below with reference to the accompanying drawings. EXAMPLES

[0018] As a method for installing a butterfly valve 14 in a fluid pipe 2 constituting an existing flow path, a method for installing a butterfly valve 14 in a fluid pipe 2 constituting an existing flow path will be described with reference to Figs. 1 to 12 as a method for installing a butterfly valve 14 in a fluid pipe 2 constituting an existing flow path according to a first embodiment.

[0019] As the uninterrupted flow method of this embodiment, a series of steps will be described, from cutting out a predetermined portion of the fluid pipe 2 constituting an existing flow path buried underground within the housing 10, to installing a butterfly valve 14 as a fluid control at the cut-out portion. Note that the fluid in the fluid pipe is clean water in this embodiment, but is not limited to this and may be, for example, industrial water, agricultural water, sewage, gas, or a gas-liquid mixture of gas and liquid.

[0020] The fluid pipe according to the present invention is a ductile cast iron pipe and is formed into a generally cylindrical shape in cross section. The fluid pipe according to the present invention may be made of other metals such as cast iron or steel, or may be made of concrete, polyvinyl chloride, polyethylene, polyolefin, etc. Furthermore, the inner peripheral surface of the fluid pipe may be covered with an epoxy resin layer, mortar, plating, etc., or the inner peripheral surface of the fluid pipe may be covered with an appropriate material by powder coating.

[0021] First, a preparation step is performed to prepare the work site. Referring to Fig. 1, in the preparation step, an excavation is performed around the fluid pipe 2 buried in the ground, and concrete is poured into the bottom of the hole to form a foundation F. The top surface of the foundation F is spaced apart in the vertical direction from the exposed pipe bottom of the fluid pipe 2. The foundation may be a steel sheet or the like as long as it can support the lower housing 30 of the housing 10.

[0022] Next, a lower housing arrangement step is performed to arrange the lower housing 30. In the lower housing arrangement step, first, the lower housing 30 suspended by a hoisting tool H equipped with a hook and a wire W suspended by a crane (not shown) is fitted onto the lower part of the fluid pipe 2, and two jacks 4, 4 (see FIG. 2(b)) having a load support function and a height adjustment function are arranged between the lower housing 30 and the foundation F. Hereinafter, the lower housing arrangement step will be described in detail.

[0023] The lower housing 30 is formed in a T-shape when viewed from the front, with a body 31 extending downward and formed into a cylindrical shape with a bottom, and curved plate-like half-split arm portions 32, 33 extending laterally approximately perpendicular to the body 31 and curved into a semicircular arc when viewed in the axial direction of the fluid pipe 2.

[0024] As shown in the balloon in FIG. 1, an adjustment bolt 10C is screwed into a female screw formed radially through the half-split arm portion 33 of the lower housing 30, and the operation part at the rear end of this adjustment bolt 10C is exposed to the outside of the half-split arm portion 33. This allows the adjustment bolt 10C to be moved forward and backward in the radial direction by rotating the operation part with a jig or the like. When the adjustment bolt 10C is not in use, the operation part is protected by a removable cap 10p or the like. In addition, the adjustment bolts 10C are equally spaced in the circumferential direction in the half-split arm portion 33 (two equally spaced in this embodiment). The same is true for the half-split arm portion 32 side. In addition, the adjustment bolts 10C are simply indicated by an x ​​mark except in the balloon in FIG. 1.

[0025] In this way, by arranging the adjustment bolts 10C, 10C, ... on the half arm portions 32, 33 so that they can move forward and backward, the adjustment bolts 10C, 10C, ... can be provided with a simpler configuration than a configuration in which a separate member is provided to hold the adjustment bolt 10C.

[0026] 2(a), the structural strength of the bottom wall 31a of the body 31 is increased by an X-shaped rib 31b formed on the lower end thereof and protruding downward. In addition, the outer bottom surface of the bottom wall 31a is divided by the rib 31b into four flat surfaces 31c, 31c, ..., and each flat surface 31c is approximately fan-shaped.

[0027] 2(b), the jack 4 is a so-called mechanical jack in which a bolt 4b is screwed into a female thread formed in a bottomed cylindrical base 4a having a pedestal. A flat disk-shaped dish 4c is placed on an upper end 4d of the bolt 4b.

[0028] The upper end 4d of the bolt 4b is formed in a cone shape. A recess 4e is formed in the radial center of the lower surface of the plate 4c, which is recessed in a cone shape in cross section and penetrates the plate 4c in the thickness direction, i.e., in the up-down direction. The upper end 4d of the bolt 4b and the recess 4e of the plate 4c are formed to be able to fit together. This makes the plate 4c detachable from the bolt 4b and prevents it from rotating together with the rotation of the bolt 4b. In addition, when placing the plate 4c on the bolt 4b, it is easy to position it. It is preferable that the cone angle of the recess 4e of the plate 4c is gentler than the cone angle of the upper end 4d of the bolt 4b, and by doing so, the plate 4c can be slightly inclined with respect to the bolt 4b.

[0029] As shown in Figure 2(a), when the jacks 4, 4 are placed on the foundation F, they are positioned at a position spaced apart from the center of the body 31 toward the outer diameter side and at a position spaced apart in a perpendicular direction from the fluid pipe 2 when viewed from below (see the plates 4c, 4c of the jacks 4, 4 indicated by the dotted line).

[0030] The flat surfaces 31c, 31c of the lower housing 30 are placed on these plates 4c, 4c. At this time, by bringing the upper end surface of the plate 4c of the jack 4 into face contact with the flat surface 31c of the lower housing 30, the load of the lower housing 30 can be distributed and supported.

[0031] In detail, when fitting the lower housing 30 onto the fluid pipe 2, the lower housing 30 suspended by a crane is fitted onto the lower part of the fluid pipe 2, and is lifted up so that the inner peripheral surface of the lower housing 30 abuts against the outer peripheral surface 2a of the fluid pipe 2, as shown in the bubble in Fig. 1. At this time, a rubber sheet or the like may be sandwiched at the abutting point between the inner peripheral surface of the lower housing 30 and the outer peripheral surface 2a of the fluid pipe 2 to prevent scratches. Then, the length of the jacks 4,4 is adjusted according to the distance between the flat surface 31c of the lower housing 30 and the foundation F, and the jacks 4,4 are arranged between the flat surface 31c and the foundation F.

[0032] This keeps the inner surface of the lower housing 30 in contact with the outer surface 2a of the fluid pipe 2; in other words, the lower housing 30 is held in a stable state by being vertically clamped between the fluid pipe 2 and the jacks 4,4, so that the hanging device H and wire W can be removed from the lower housing 30.

[0033] Next, a connecting step is performed in which the upper housing 20 of the housing 10 is hermetically connected to the lower housing 30. As shown in Fig. 3, in the connecting step, first, the upper housing 20 is hung down by a crane via a hoisting tool H and a wire W, and the upper housing 20 is fitted onto the fluid pipe 2 while the cut surface 20a of the upper housing 20 is placed in contact with the cut surface 30a of the lower housing 30.

[0034] The upper housing 20 is formed in an inverted T-shape when viewed from the front, with a neck 21 extending upward and formed in a roughly cylindrical shape, and half-split arm portions 22, 23 extending laterally roughly perpendicular to the neck 21 and formed in the shape of a semicircular curved plate when viewed in the axial direction of the fluid pipe 2.

[0035] The adjustment bolts 10C are provided on the half arms 22, 23 of the upper housing 20, similarly to the lower housing 30, and are arranged at two equal intervals in the circumferential direction. The adjustment bolts 10C provided on the half arm 22 of the upper housing 20 and the half arm 32 of the lower housing 30 are arranged at approximately the same position in the pipe axis direction, and are arranged at the 2 o'clock, 4 o'clock, 8 o'clock, and 10 o'clock positions in the circumferential direction. The same is true for the adjustment bolts 10C provided on the half arm 23 of the upper housing 20 and the half arm 33 of the lower housing 30.

[0036] Furthermore, rectangular plate-like flanges 24, 34 that are approximately parallel to the cut surfaces 20a, 30a and protrude outward are formed on the half-split arm portions 22, 23 of the upper housing 20 and the half-split arm portions 32, 33 of the lower housing 30. By fastening these flanges 24, 34 with bolts B1 and nuts N1, the upper housing 20 and the lower housing 30 can be temporarily fixed together.

[0037] Then, the split surfaces 20a, 30a of the upper housing 20 and the lower housing 30 are hermetically welded together to form the housing 10. Accordingly, the half arms 22, 32 form a cylindrical arm portion 10A (see FIG. 7) of the housing 10, and the half arms 23, 33 form a cylindrical arm portion 10B (see FIG. 7) of the housing 10.

[0038] Next, a position adjustment process is performed in which the adjustment bolts 10C, 10C, ... are used to align the housing 10 with respect to the fluid pipe 2. Note that in Figs. 4 to 6 referred to in the description of this process, the illustrations are exaggerated to clearly show the change in position of the housing 10 with respect to the fluid pipe 2.

[0039] In the position adjustment process, the movement allowance M of the housing 10 relative to the fluid pipe 2 is secured in advance by the jacks 4, 4. More specifically, as shown in Fig. 4(a), from the position of the dish 4c of the jack 4 at the time when the inner peripheral surface of the lower housing 30 is held in contact with the outer peripheral surface 2a of the fluid pipe 2, the dish 4c can be moved back by the movement allowance M in the direction away from the fluid pipe 2, as shown in Fig. 4(b).

[0040] 3, in the position adjustment process, first, the housing 10 is slightly lifted with a crane, and the jacks 4, 4 are removed and slightly contracted, and then repositioned. At this time, the jacks 4, 4 may be simply contracted while remaining in place. Next, the crane is operated to roughly align the axis of the arms 10A, 10B of the housing 10 with the axis of the fluid pipe 2.

[0041] Then, while the housing 10 is suspended by the crane, which is the position adjustment means and holding means, fine position adjustment is performed using the adjustment bolts 10C, 10C, .... In more detail, when moving the housing 10 downward relative to the fluid pipe 2, the adjustment bolts 10C, 10C of the upper housing 20 are retracted toward the outer diameter side, as in the transition from Fig. 5(b) to Fig. 5(a), and the adjustment bolts 10C, 10C of the lower housing 30 are advanced toward the inner diameter side, as in the transition from Fig. 6(a) to Fig. 6(b).

[0042] Conversely, when the housing 10 is moved upward relative to the fluid pipe 2, the adjustment bolts 10C, 10C of the upper housing 20 are advanced toward the inner diameter side, so as to transition from Figure 5(a) to Figure 5(b), and the adjustment bolts 10C, 10C of the lower housing 30 are retracted toward the outer diameter side, so as to transition from Figure 6(b) to Figure 6(a).

[0043] Although not shown in the figure, when viewing the arm 10B in the axial direction of the fluid pipe 2, when the housing 10 is moved in the 3 o'clock direction relative to the fluid pipe 2, the adjustment bolts 10C, 10C located on the 3 o'clock side (2 o'clock and 4 o'clock) are advanced toward the inner diameter, and the adjustment bolts 10C, 10C located on the 9 o'clock side (8 o'clock and 10 o'clock) are retracted toward the outer diameter.

[0044] Similarly, when the housing 10 is moved in the 9 o'clock direction relative to the fluid pipe 2, the adjustment bolts 10C, 10C located on the 9 o'clock side (8 o'clock and 10 o'clock) are advanced toward the inner diameter side, and the adjustment bolts 10C, 10C located on the 3 o'clock side (2 o'clock and 4 o'clock) are retracted toward the outer diameter side.

[0045] At this time, since the housing 10 is suspended by a crane when aligning the housing 10 with the fluid pipe 2, most of the weight of the housing 10 can be prevented from acting directly on the fluid pipe 2.

[0046] In addition, the weight of the housing 10 presses the adjustment bolts 10C, 10C, ... on the upper housing 20 side against the outer circumferential surface 2a of the fluid pipe 2, preventing excessive load from being applied to the outer circumferential surface 2a. This makes it easy to rotate the adjustment bolts 10C, 10C, ..., making it easy to perform fine adjustments.

[0047] In addition, since the housing 10 is suspended by a crane, resistance such as friction is less likely to occur compared to when the position adjustment described above is performed while the housing 10 is placed on the plate 4c of the jack 4, for example, and fine adjustments can be made easily.

[0048] When the centers of the arms 10A, 10B are approximately aligned with the axis of the fluid pipe 2, this state is maintained with a crane, and the adjustment bolts 10C, 10C, ... are advanced toward the inner diameter side so as to bite into the fluid pipe 2. This makes it possible to maintain the state in which the centers of the arms 10A, 10B are aligned with the axis of the fluid pipe 2.

[0049] Furthermore, the length of the jacks 4, 4 is adjusted according to the distance between the flat surface 31c of the lower housing 30 and the foundation F, and the jacks 4, 4 are placed between the flat surface 31c and the foundation F. As a result, the load of the housing 10 is supported by the jacks 4, 4, so that the hoisting tool H and the wire W can be removed from the housing 10.

[0050] Next, a sealing process is performed to seal the gap between the housing 10 and the fluid pipe 2. As shown in Fig. 7, in the sealing process, first, the seal ring 12 is arranged around the outer circumferential surface 2a of the fluid pipe 2 in the circumferential direction, and the press rings 13 formed in halves are fitted onto and connected to the fluid pipe 2, and the flange of the arm portion 10B and the press ring 13 are fastened to the T-head bolt B2 with a nut N2.

[0051] At this time, because the center of the arm portion 10B is aligned with the pipe axis of the fluid pipe 2, an annular gap of approximately constant width is formed in the circumferential direction between the inner peripheral surface of the arm portion 10B and the outer peripheral surface 2a of the fluid pipe 2. This not only makes it easy to press the seal ring 12 axially between the arm portion 10B and the fluid pipe 2, but also allows the pressed-in seal ring 12 to be pressed against the inner peripheral surface of the arm portion 10B and the outer peripheral surface 2a of the fluid pipe 2 with a uniform force in the circumferential direction to provide a seal.

[0052] Furthermore, bolts 13A, 13A, ... evenly spaced in the circumferential direction are used to press claw members 13B arranged on the inner diameter side of press ring 13 against outer circumferential surface 2a of fluid pipe 2. Note that the explanation of arm 10A side is the same as that of arm 10B side, so the explanation thereof will be omitted.

[0053] As described above, when fitting the housing 10 onto the fluid pipe 2, the housing 10 can be arranged while ensuring the movement allowance M (see FIG. 4) relative to the fluid pipe 2. This allows the housing 10 to be reliably aligned with the fluid pipe 2, making installation easy.

[0054] Furthermore, in the lower housing installation process, since the lower housing 30 can be clamped between the fluid pipe 2 and the jacks 4, 4, the upper housing 20 can be transported and the housing 10 can be suspended using the same crane.

[0055] Next, although not shown directly, a flange lid for a water pressure test is attached to the flange 21a of the housing 10, and a test is performed by applying water pressure approximately equal to that inside the fluid pipe 2 to the sealed gap between the inner circumferential surface of the housing 10 and the outer circumferential surface 2a of the fluid pipe 2. At this time, the housing 10 is filled with clean water and the total weight increases, but since the housing 10 is supported by the jacks 4, 4, it is possible to prevent most of the total weight of the housing 10 from acting directly on the fluid pipe 2. Therefore, it is possible to prevent the fluid pipe 2 from bending before it is cut.

[0056] Furthermore, although the fluid pipe 2 is axially passed through the casing 10, when viewed from above, the jacks 4, 4 are arranged opposite each other at a position spaced away from the axis of the fluid pipe 2 toward the outer diameter and perpendicular to the axis, thereby preventing the casing 10 from rotating around the pipe axis with the fluid pipe 2 as the axis.

[0057] After the hydraulic test is completed, the flange lid is removed, and a pouring process is performed in which concrete C1 is poured between the fluid pipe 2 and the housing 10 and the foundation F. As shown in FIG. 8, in the pouring process, the concrete C1 shown in a dot pattern is poured so as to integrate the arm 10A, the exposed portion of the fluid pipe 2 on the arm 10A side, and the foundation F. The same is true for the arm 10B and the exposed portion of the fluid pipe 2 on the arm 10B side. In this pouring process, the above-mentioned jacks 4, 4 support the load of the housing 10 etc. from below, so that the position of the housing 10 can be maintained until the concrete C1 hardens.

[0058] Next, a cutting process is performed to cut off the fluid pipe 2. As shown in Fig. 9, in the cutting process, first, the flange 21a of the neck 21 and the valve body 5a of the working valve 5 are fastened with bolts and nuts (not shown). It goes without saying that a gasket is interposed between the flange 21a of the neck 21 and the valve body 5a to seal them.

[0059] Next, as shown in Fig. 10, the flange of the valve box 5a (see Fig. 9) and the lower flange of the mounting flange cylinder 6 are connected with bolts and nuts (not shown), and the upper flange of the mounting flange cylinder 6 and the excision device 7 are connected with bolts and nuts (not shown). It goes without saying that gaskets are interposed between the flange of the valve box 5a and the lower flange of the mounting flange cylinder 6, and between the upper flange of the mounting flange cylinder 6 and the excision device 7 to provide a seal.

[0060] In this way, even if the total weight of the housing 10 increases with the addition of the weights of the working valve 5, the mounting flange cylinder 6, and the excision device 7, since the housing 10 is supported by the jacks 4, 4 and the concrete C1, C1, it is possible to prevent most of the total weight of the housing 10 from directly acting on the fluid pipe 2. Therefore, it is possible to prevent the fluid pipe 2 from bending before being cut.

[0061] In addition, the jacks 4,4 and the concrete C1,C1 prevent the housing 10 from rotating around the axis of the fluid pipe 2, so there is no risk of the working valve 5, mounting flange tube 6, and excision device 7, which are integrally erected above the housing 10 and have high centers of gravity, tipping over.

[0062] Furthermore, arm 10A and the exposed portion of fluid pipe 2 on the arm 10A side are supported integrally with foundation F by concrete C1, and arm 10B and the exposed portion of fluid pipe 2 on the arm 10B side are supported integrally with foundation F by concrete C1, preventing most of the total weight of housing 10 from acting on fluid pipe 2. Therefore, it is possible to prevent fluid pipe 2 from bending before being cut.

[0063] Then, the valve body (not shown) of the working valve 5 is retracted from within the valve box 5a of the working valve 5 to open it, and a part of the fluid pipe 2 is cut off with the cutter 8 of the cutting device 7 in a state where the flow is not interrupted. As a result, the fluid in the pipe flows into the inside of the housing 10.

[0064] At this time, the housing 10 is connected to the fluid pipe 2 by adjustment bolts 10C, 10C, ... and the push rings 13, 13 are connected to the ends 2H, 2T of the fluid pipe 2 by bolts 13A, 13A, .... Therefore, even if a sudden change in flow occurs when cutting the fluid pipe 2 and causes the fluid pipe 2 to jump up, it is possible to prevent the fluid pipe 2 from coming out of the housing 10 and the push rings 13, 13.

[0065] Furthermore, even if the casing 10 is filled with clean water and the total weight of the casing 10 increases further, since the casing 10 is supported by the jacks 4,4 and the concrete C1,C1, it is possible to prevent most of the total weight of the casing 10 from acting directly on the ends 2H,2T of the cut fluid pipe 2.

[0066] This prevents the end 2H from tilting, which not only prevents unintended load from being applied to the flow path connected to the end 2H, but also ensures an opening area necessary for removing the cutter 8 after cutting the fluid pipe 2. Therefore, the cutter 8 can be easily removed.

[0067] In addition, the jacks 4, 4 and the concrete C1, C1 prevent the casing 10 from rotating around the axis of the fluid pipe 2, so that the casing 10 is stably supported even if the total weight of the casing 10 increases further.

[0068] In addition, the arm 10A and the end 2H including the exposed portion of the arm 10A side of the fluid pipe 2 are supported integrally with the foundation F by the concrete C1, so that they are kept aligned with the arm 10A. The same is true for the arm 10B and the end 2T including the exposed portion of the arm 10B side.

[0069] In addition, since the bottom wall 31a of the housing 10 is provided at a position sufficiently separated from the fluid pipe 2, the cylindrical member 8a and the center drill 8b of the cutter 8 are unlikely to come into contact with each other when cutting the fluid pipe 2.

[0070] In addition, when connecting the fluid pipe 2, by connecting a drain pipe D to the flange tube provided below the bottom wall 31a, cutting chips generated when the fluid pipe 2 is cut by the cutter 8 can be discharged to the outside together with the fluid.

[0071] After that, although not shown directly in the figure, the cutter 8 is raised together with the section of the fluid pipe 2, and the valve body of the working valve 5 advances into the valve box 5a to be in a closed state. This makes it possible to remove the cutting device 7 and the mounting flange tube 6 from the working valve 5 while preventing water leakage and maintaining an uninterrupted flow state.

[0072] Next, a flow regulator installation process is performed in which a butterfly valve 14 is installed as a flow regulator in the housing 10. As shown in Fig. 11, in the flow regulator installation process, first, the flange of the valve box 5a and the housing 9a of the insertion device 9 are connected. Next, the working valve 5 is opened, and the drive mechanism 9b of the insertion device 9 is operated to place the butterfly valve 14 in the open state in the housing 10. It goes without saying that a gasket is interposed between the flange of the valve box 5a and the housing 9a to seal them.

[0073] In this way, even if the total weight of the casing 10 increases with the addition of the weights of the working valve 5, the insertion device 9, and the butterfly valve 14, since the casing 10 is supported by the jacks 4, 4 and the concrete C1, C1, it is possible to prevent most of the total weight of the casing 10 from directly acting on the ends 2H, 2T of the fluid pipe 2. This makes it possible to prevent the ends 2H, 2T of the fluid pipe 2 from tilting, so that the butterfly valve 14 can be inserted stably.

[0074] In particular, when installing the butterfly valve 14, the insertion device 9 temporarily presses the butterfly valve 14 downward toward the inner bottom surface of the housing 10 to apply a load, but the jacks 4, 4 and the concrete C1, C1 can support the butterfly valve 14 against the weight of the working valve 5, insertion device 9, etc. and the downward load.

[0075] In addition, the arm 10A and the end 2H of the fluid pipe 2 are supported integrally with the foundation F by concrete C1 together with the arm 10A, so that they remain aligned with the arm 10A even if the weight of the housing 10 changes. The same applies to the arm 10B and the end 2T.

[0076] Then, the butterfly valve 14 is inserted into the housing 10, and placed with the packings 40, 41 pressed against the seating surface formed in the housing 10. Here, the packing 40 is fixed to both side surfaces and the bottom surface of a partition wall 43 for separating the ends 2H, 2T of the fluid pipe 2 together with the valve body 42. The packing 41 is fixed to the outer periphery of a disk-shaped lid portion 44 for closing the neck portion 21 of the housing 10. These packings 40, 41 are connected so as to be continuous.

[0077] Further, referring to FIG. 12, a plurality of holding bolts 25 arranged in the circumferential direction of the neck 21 are advanced to the inner diameter side of the neck 21. More specifically, the holding bolts 25 penetrate the peripheral wall of the neck 21 and are screwed into the female threads of the through-holes formed in the peripheral wall. The holding bolts 25 advance to the inner diameter side of the neck 21 by rotating in a predetermined direction, and can prevent the lid 44 from coming off by abutting against the lid 44 of the butterfly valve 14. Note that the holding means such as the holding bolts 25 may be separate from the advancing member that is screwed into the female threads of the through-holes and the abutting member that moves with the advancing member to abut against the fluid control valve, and the number and arrangement of the members may be appropriately changed. Also, a recess may be provided on the inner surface of the peripheral wall, and a plate or the like may be fitted and fixed.

[0078] Thereafter, the insertion device 9 and the working valve 5 are removed from the housing 10, and a packing 46 is placed between the inner circumferential surface of the neck 21 and the ring 45 fitted onto the lid 44, after which the flange 21a of the neck 21 and the lid 11 are fastened with bolts and nuts (not shown). This provides a seal between the inner circumferential surface of the neck 21 and the lid 44. Needless to say, a gasket is interposed between the flange 21a of the neck 21 and the lid 11 to provide a seal.

[0079] As described above, the flow-uninterrupted construction method of this embodiment can be performed to install the butterfly valve 14 at a predetermined location of the fluid pipe 2 while maintaining an uninterrupted flow state.

[0080] After the lid 11 is attached to the housing 10 as described above, the jacks 4, 4 may be removed, and by recovering the jacks 4, 4, they can be reused in other construction work.

[0081] In addition, although a crane has been described as an example of a means for holding the housing 10, the present invention is not limited to this, and the jacks 4, 4 may be used as the holding means. In other words, rough alignment may be performed by extending and retracting the jacks 4, 4 while the housing 10 is placed on the jacks 4, 4.

[0082] In addition, although the flow control valve has been described as being a butterfly valve 14, this is not limited to this and may be other types of valves such as a gate valve, a ball valve, etc., and may also be a partition plate, a plug, etc., and may be modified as appropriate. EXAMPLES

[0083] Next, a flow-uninterrupted construction method according to a second embodiment will be described with reference to Fig. 13 and Fig. 14. Note that the same components as those shown in the first embodiment are given the same reference numerals and the duplicated description will be omitted.

[0084] As shown in FIG. 13, the flow-uninterrupting method of this embodiment involves installing a housing 110 capable of branching the existing flow path in a fluid pipe 2 that constitutes the existing flow path, and a switching valve 114 for switching the flow path.

[0085] The housing 110 is formed in a T-shape when viewed from above, and includes a connection part 10D (see FIG. 14) that extends in a direction perpendicular to the fluid pipe 2. The housing 110 is also composed of a pair of upper and lower housings, an upper housing 120 and a lower housing 130. As shown in FIG. 13, the connection part 10D is closed by a flange lid 15 (see FIG. 13), thereby preventing the fluid in the pipe from flowing out.

[0086] The switching valve 114 is installed in the housing 110 and serves to branch the clean water that has flowed into the housing 110 from the end 2H of the fluid pipe 2 to the end 2T of the fluid pipe 2 and the connection part 10D, respectively, and to adjust the flow rate of each. Therefore, it is possible to close the end 2T side of the fluid pipe 2 and to close the connection part 10D side.

[0087] The flow-uninterrupted construction method of this embodiment is performed in the same manner as in the above-mentioned embodiment 1, including the preparation process, lower housing arrangement process, connection process, position adjustment process, sealing process, pouring process, cutting process, and flow regulator installation process. In this embodiment, the lower housing arrangement process and pouring process, which are different from the above-mentioned embodiment 1, will be mainly described, and the other processes are substantially the same as those in the above-mentioned embodiment 1, so their description will be omitted.

[0088] 14, in the lower housing arrangement step of this embodiment, one jack 4 is arranged at a position along the axis of the fluid pipe 2 with respect to the center of the body 131, and the other jack 4 is arranged on the opposite side of the connection part 10D. This is the same in the subsequent steps.

[0089] This allows the flat surfaces 31c, 31c to be placed on the plate 4c of the jack 4, avoiding the U-shaped rib 131b formed on the lower end of the body 131 and protruding downward, and the drain pipe D connected to the lower part of the body 131.

[0090] Furthermore, the housing 110 can be prevented from rotating around the axis of the fluid pipe 2 by the jack 4 disposed on the opposite side to the connection portion 10D.

[0091] 13, in the casting process of this embodiment, concrete C2 shown in a dot pattern is cast in a position that completely covers the boundary between the upper housing 120 and the lower housing 130, more specifically, until the weld beads are completely hidden. Since the jacks 4, 4 are embedded in the concrete C2, they can continue to hold the position of the housing 110 until the concrete C2 hardens.

[0092] The branch pipe can be connected while maintaining an uninterrupted flow state by closing the connection part 10D side with the switching valve 114, removing the flange lid 15, and then connecting the branch pipe. Also, instead of the flange lid 15, the branch pipe may be directly connected to the connection part 10D and the cutting step may be performed. In such a configuration, it is preferable to place a valve midway along the branch pipe or between the connection part 10D and the branch pipe to prevent the fluid in the pipe that flows into the housing 110 due to the disconnection of the fluid pipe 2 from flowing out.

[0093] As described above, the uninterrupted flow method of this embodiment can be performed by installing the casing 110 and the switching valve 114 capable of branching the flow path while maintaining an uninterrupted flow state at a predetermined position of the fluid pipe 2. EXAMPLES

[0094] Next, a flow-uninterrupted construction method according to a third embodiment will be described with reference to Fig. 15 and Fig. 16. Note that the same components as those shown in the first embodiment are given the same reference numerals and the duplicated description will be omitted.

[0095] As shown in FIG. 15, the flow-uninterrupting construction method of this embodiment is to install a soft seal valve 214 as a flow control valve in a fluid pipe 2 that constitutes an existing flow path.

[0096] Housing 210 for installing soft seal valve 214 has seal members 212 fitted into the inner circumferential surfaces of arms 210A and 210B. Housing 210 is also composed of a pair of upper and lower housings, upper and lower 220 and lower 230. Accordingly, seal member 212 is also split in half like housing 210, and the split seal members are fitted into upper housing 220 and lower housing 230, respectively.

[0097] The flow-uninterrupted construction method of this embodiment is performed in the same manner as in the above-mentioned embodiment 1, including a servicing process, a lower housing arrangement process, a connecting process, a position adjustment process, a sealing process, a cutting process, and a flow regulator installation process. In this embodiment, the servicing process, the lower housing arrangement process, the connecting process, the position adjustment process, and the sealing process, which are different from the above-mentioned embodiment 1, will be mainly described, and the other processes are substantially the same as those in the above-mentioned embodiment 1, so their description will be omitted.

[0098] As shown in FIG. 15, in the preparation process of this embodiment, a steel plate P is placed at the bottom of the excavated hole.

[0099] In the lower housing placement process of this embodiment, when the jacks 204, 204 are placed on the iron plate P, they are placed at a position spaced apart on the outer diameter side based on the center of the body 231 (see Figure 16), which is formed so as to bulge downward beyond the arms 210A, 210B, and at a position spaced apart in a perpendicular direction to the fluid pipe 2 when viewed from above.

[0100] 16(a), the body 231 is formed with mounting portions 231c, 231c for being placed on the heads 204c, 204c of the jacks 204, 204. The mounting portions 231c are formed with a flat surface that is approximately parallel to the axial direction of the fluid pipe 2.

[0101] The jack 204 is a so-called mechanical jack in which a hexagonal bolt 204b is screwed into a female thread formed in a base 204a. A mounting portion 231c of a lower housing 230 is placed on a head 204c of the hexagonal bolt 204b. In this way, the jack 204 is simply configured compared to the jack 4 having a separate pan 4c.

[0102] As shown in FIG. 16(a), in the connecting step of this embodiment, the upper housing 220 is placed on the lower housing 230 with a seal member interposed therebetween, and they are temporarily fixed together using bolts B3 and nuts N3.

[0103] In the position adjustment process of this embodiment, the jacks 204, 204 are extended while the upper housing 220 and the lower housing 230 are retightened using the bolt B3 and the nut N3. More specifically, by retightening the upper housing 220 and the lower housing 230 using the bolt B3 and the nut N3, the seal member 212 is crushed and the inner diameters of the upper housing 220 and the lower housing 230 are reduced. That is, the movement allowance in this embodiment is the elastic deformation allowance of the seal member 212.

[0104] Accordingly, by rotating the heads 204c, 204c of the jacks 204, 204 with a hexagonal wrench or the like and advancing the hexagonal bolts 204b, 204b toward the fluid pipe 2, it is possible to align the axis of the fluid pipe 2 with the axis of the upper housing 220 and the lower housing 230 while the upper housing 220 and the lower housing 230 are held by the jacks 204, 204. In other words, the jack 204 is the holding means in this embodiment. Therefore, it is possible to finely align the upper housing 220 and the lower housing 230 connected to the fluid pipe 2.

[0105] In the sealing process of this embodiment, the seal member 212 interposed between the upper housing 220 and the lower housing 230 is pressed and sealed while performing the above-mentioned alignment.

[0106] Thereafter, movement prevention fittings 213, 213 are attached to housing 210. Movement prevention fitting 213 is configured by combining partial housings formed in half, and claw members 213B are provided on the inner diameter side. These partial housings of movement prevention fitting 213 are fastened with bolts B4 and nuts N4 to reduce the inner diameter, thereby pressing claw members 213B against fluid pipe 2. This makes it possible to prevent fluid pipe 2 from coming out of arm 210B even if fluid pipe 2 is cut. The same applies to arm 210A.

[0107] As described above, the flow-uninterrupted construction method of this embodiment can be performed to install the soft seal valve 214 at a predetermined location of the fluid pipe 2 while maintaining an uninterrupted flow state. EXAMPLES

[0108] Next, a flow-uninterrupted construction method according to a fourth embodiment will be described with reference to Fig. 17 to Fig. 20. Note that the same components as those shown in the first embodiment will be given the same reference numerals and duplicated explanations will be omitted.

[0109] As shown in Figures 17 and 18, the flow-uninterrupted construction method of this embodiment involves connecting a branch pipe 3, which is laid vertically below the fluid pipe 2, to the fluid pipe 2 that constitutes an existing flow path, using a casing 310.

[0110] A connecting pipe 310D serving as a flow path component member having a curved pipe shape formed in an L-shape when viewed from the side is connected to the body 331 of the housing 310, and a branch pipe 3 (see FIG. 18) is connected to the connecting pipe 310D.

[0111] The uninterrupted flow method of this embodiment is performed in the same manner as in the above-mentioned embodiment 1, including the servicing process, lower housing arrangement process, connection process, position adjustment process, sealing process, pouring process, cutting process, and blocking process. In this embodiment, the lower housing arrangement process, pouring process, and blocking process, which are different from the above-mentioned embodiment 1, will be mainly described, and the other processes are substantially the same as those in the above-mentioned embodiment 1, so their description will be omitted.

[0112] 17 and 18, in the lower housing arrangement step and the like of this embodiment, the jacks 304, 304, 404, 404 are arranged at positions spaced apart from the outer diameter side with respect to the center of the body 131 and along the axis of the fluid pipe 2. More specifically, the jacks 304, 304 are arranged below the half arms 32, 33, and the jacks 404, 404 are arranged below the body 331.

[0113] 19, the jack 304 is a so-called mechanical jack in which a bolt 304b is screwed into a female thread formed in a base 304a. A curved plate-like dish 304c that is bent to fit the outer circumferential surfaces of the half arms 32 and 33 is placed on an upper end 304d of the bolt 304b.

[0114] The bottom surface of the plate 304c has a recess 304e into which the upper end 304d of the bolt 304b is inserted, and ribs 304f, 304f extending from the recess 304e along the longitudinal direction of the plate 304c. This increases the structural strength of the plate 304c, allowing the jack 304 to stably support the half arms 32, 33.

[0115] In addition, the plate of the jack 404 is tiltable relative to the bolt (see FIG. 20). The plate 304c of the jack 304 may also be provided so as to be tiltable relative to the bolt 304b. The jack 404 may simply be placed so that the plate is inclined at a predetermined angle relative to the bolt and cannot be tilted. For example, a recess may be provided extending vertically from the plate inclined to match the inclination angle of the fluid pipe 402. Furthermore, the jack 4 may be used in place of the jacks 304, 404.

[0116] As a result, even if the fluid pipe 402 extends along a slope, i.e., is inclined with respect to the horizontal direction, as shown in FIG. 20, by individually adjusting the heights of each of the jacks 304, 304, 404, 404 arranged at a distance in the extension direction of the fluid pipe 402, the load applied to each of these jacks can be evenly distributed, thereby making it possible to stably hold the housing 310.

[0117] Furthermore, as described above, even when one jack 4 is positioned at a position spaced apart from the axis of the fluid pipe 402 toward the outer diameter side, and another jack 4 is positioned spaced apart in the pipe axial direction, as in the second embodiment, by adjusting the length of each jack 4, the axes of the arms 310A, 310B of the housing 310 can be aligned with the axis of the fluid pipe 402.

[0118] 17 and 18, in the casting process of this embodiment, concrete C3 shown in a dot pattern is cast until the weld bead is completely hidden. The connection part between the connection pipe 310D and the branch pipe 3 is also buried. Since the jacks 304, 304, 404, 404 are buried in the concrete C3, the position of the housing 310 can be maintained until the concrete C3 hardens.

[0119] In the closing step, an inner lid (not shown) is inserted into the neck 21 using an insertion device 9 and an operating valve 5 (see FIG. 11) to seal the neck 21. The inner lid is prevented from coming off by a retaining bolt 25 (see FIG. 12). Then, the flange 21a of the neck 21 and the disk-shaped flange lid 311 are fastened together by bolts and nuts (not shown). It goes without saying that a gasket is interposed between the flange 21a of the neck 21 and the flange lid 311 to provide a seal.

[0120] As described above, the flow-uninterrupted construction method of this embodiment can be performed to connect a branch pipe 3 laid vertically below the fluid pipe 2 to a predetermined location of the fluid pipe 2 while maintaining an uninterrupted flow state.

[0121] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0122] For example, in the above embodiment, the space between the fluid pipe and the housing is described as being sealed by a sealing member, but this is not limited to this, and the space may be sealed by welding, or so-called side rings may be welded to the fluid pipe and the housing, respectively, to seal the space, or this may be modified as appropriate.

[0123] In the above embodiment, the excision device is described as a hole saw having a cutter, but is not limited to this, and may be a drilling machine, an end mill, or any other suitable modification. In other words, the fluid pipe constituting the flow path is not limited to being cut, and it is sufficient that the fluid can flow through at least a portion of the cut-out portion. [Explanation of symbols]

[0124] 2 Fluid tube 2a Outer surface 4 Jack 10. Chassis 10C Adjustment bolt (position adjustment means) 11 Lid 12 Seal ring 13 Push Ring 14 Butterfly valve (fluid control) 20 Upper case 30 Lower housing 110 Cabinet 114 Switching valve 120 Upper case 130 Lower housing 204 Jack (position adjustment means, holding means) 210 Cabinet 212 Sealing member (position adjustment means) 213 Anti-movement fittings 214 Soft seal valve (fluid control) 220 Upper case 230 Lower housing 3 Branch Pipe 304 Jack 310 Case 310D Connecting pipe (flow path component) 311 Flange cover 402 Fluid pipe 404 Jack C1~C3 Concrete F Basics H Hanging device M Moving fee P Iron Plate W Wire

Claims

1. a lower housing arrangement process for supporting and arranging a lower housing, which constitutes a housing that can be separated into upper and lower parts, in contact with a fluid pipe that constitutes a flow path, using a jack having a height adjustment function and a load support function; a connecting step of placing and connecting an upper housing constituting the housing to the lower housing; a position adjustment step of suspending the lower housing and the upper housing connected to each other with a crane, and then moving the jack away from the lower housing and aligning the fluid pipe with a position adjustment means; and a sealing step of sealing between the housing and the fluid pipe.

2. A lower housing arrangement process for arranging a lower housing constituting a housing that can be separated into upper and lower parts relative to a fluid pipe constituting a flow path using a jack having a height adjustment function and a load support function; a connecting step of placing and connecting an upper housing constituting the housing to the lower housing; a position adjustment step of aligning the lower housing and the upper housing connected to each other with respect to the fluid pipe using an adjustment bolt and a crane provided on the housings, which are position adjustment means; and a sealing step of sealing between the housing and the fluid pipe.

3. 3. The method according to claim 2, wherein the upper housing and the lower housing are provided with the adjustment bolts.

4. 3. The method according to claim 1, wherein the jacks are arranged in a plurality of positions spaced apart from each other in the axial direction of the fluid pipe.

5. 3. The method according to claim 1, wherein at least one of the jacks is disposed at a position spaced apart from the axis of the fluid pipe.

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