JP7419431B2 - How to install flange reinforcement - Google Patents

Description

The present invention provides a method for attaching a flange reinforcing tool that clamps and reinforces a flange joint between a flange of a conduit component and a flange of a connecting member installed in a narrow space such as a valve chamber from above and below. The present invention relates to a mounting tool used therefor.

For example, as disclosed in Patent Document 1, there is a device in which flanges of a fluid pipe and a fire hydrant, which are conduit constituent members, are respectively joined to flanges at both upper and lower ends of a valve device, which is a connecting member. When flanges are joined together in this manner, there is a risk that the fluid in the fluid pipe may leak to the outside from the joined portion of the flanges if corrosion or uneven settlement due to aging deterioration or the like or external force such as an earthquake is applied.

Therefore, as described in Patent Document 1, a flange reinforcing tool has been developed that clamps and reinforces the flange joint from above and below to prevent fluid leakage.

JP 2016-180452 (Page 4, Figure 1)

The flange reinforcement device described in Patent Document 1 uses a pair of upper and lower clamping members that can be opened and closed with one end as a fulcrum to clamp the joint between the flanges of a fluid pipe and a fire hydrant, which are conduit constituent members, from above and below. The flange joint is reinforced from above and below by connecting the upper and lower clamping members with bolts and nuts, but the following problems arise when installing the flange reinforcing tool.

That is, since most of the fluid pipes are buried underground, the valve devices and fire hydrants connected thereto are often flanged at a position somewhat deep from the ground surface. In addition, because valve devices and fire hydrants are often placed inside narrow valve cases or valve chambers, it is not possible to secure sufficient work space around the flange joints, making it difficult for workers to work inside the valve chamber. It is difficult. For this reason, there are problems in that skill is required to attach the flange reinforcing tool, and it takes too much time to attach the flange reinforcing tool to the flange joint, resulting in a decrease in work efficiency. In addition, there are cases where the valve chamber is destroyed or removed and a flange reinforcing tool is installed, and then the valve chamber is rebuilt, which requires a large amount of work cost, time, and effort. There is.

The present invention has been made in view of the above problems, and even if sufficient work space is not secured around the flange joint, a flange reinforcing tool can be easily attached to the flange joint from above, increasing work efficiency. It is an object of the present invention to provide a method for installing a flange reinforcing device and a tool for installing it that can improve the performance of the flange reinforcing device.

In order to solve the above problems, the flange reinforcement mounting method of the present invention includes:
A lower holding member consisting of a pair of split bodies fitted onto the lower flange joint portion of a conduit constituent member which is joined to both flanges of a connecting member having flanges at both upper and lower ends, and an upper part of the conduit constituent member. A flange for reinforcing the flange joint, the flange comprising at least an upper clamping member consisting of a pair of split bodies fitted externally to the flange joint of the flange, and a connecting bolt and nut connecting the lower clamping member and the upper clamping member to each other. A method for attaching a reinforcing device,
One ends of the pair of divided bodies in the lower holding member are temporarily connected in advance with bolts and nuts so that both divided bodies can be opened and closed, and the pair of divided bodies are oriented in the vertical direction. A first step of supporting with a pair of hanging support tools;
By using the tentative connection part of the pair of divided bodies supported by the hanging support tool as a fulcrum and moving it in an open state to the side of the lower flange joint part, and closing both of the divided bodies, the lower part is suspended. a second step of fitting and temporarily placing the lower holding member on the outer diameter portion of the flange joint from the side;
A bolt and a nut connecting the other ends of the pair of split bodies are supported in a vertically opposed manner by a support portion at the lower end of a fastening tool, and the fastening tool is moved to connect the bolt and nut to each other. a third step of connecting the other end of the divided body;
The fastening tool connects the bolt and nut temporarily connecting the one ends of the pair of divided bodies and the bolt and nut connecting the other ends of the pair of divided bodies while preventing co-rotation. The present invention is characterized in that it includes at least a fourth step of tightening the lower clamping member from above and attaching the lower clamping member to the lower flange joint.
According to this feature, by carrying out the first to fourth steps, the lower clamping member constituting the flange reinforcing tool is attached to the flange joint between the flange at the lower end of the connecting member and the flange of the conduit constituting member. A member that can be easily installed from above and reinforces the flange joint from above and below can be installed. Therefore, for example, even if the pipe constituting members and connecting members are installed in a narrow space and a large working space is not secured around their flange joints, the valve chamber can be easily removed without destroying or removing it. The work of installing the flange reinforcing tool can be done efficiently, improving work efficiency.

In the first step, with the lower end of the suspension tool fitted into the notch formed on the outer diameter of the divided body, the upper and lower surfaces of the divided body are held by the support members of the suspension tool. It is characterized by being held and supported.
According to this feature, the pair of divided bodies can be supported by two hanging tools and can be easily opened/closed or moved downward.

After the upper holding member is attached to the upper flange joint by the same procedure as the first to fourth steps, the notches formed in the outer diameter portions of the upper and lower divided bodies are vertically aligned with each other. The present invention is characterized by further comprising a fifth step of positioning in the circumferential direction so as to.
According to this feature, by positioning the upper and lower divided bodies in the circumferential direction and aligning the notches with each other, it is possible to accurately attach the connecting bolt across these notches.

In the fifth step, a rod is inserted into the notch of the upper and lower divided bodies from above and positioned.
According to this feature, the notches of the upper and lower divided bodies can be easily aligned by simply inserting the rod into the notch from above.

a sixth step of holding the connection bolt and nut that connect the upper clamping member and the lower clamping member in a vertically opposed manner by a holding part at the lower end of the fastening tool;
The fastening tool is moved to fit the connecting bolt held therein into the notch of the upper and lower divided bodies from the side, and the fastening tool is used to prevent the connecting bolt and nut from rotating together. The present invention is characterized in that it further includes a seventh step of tightening from above and connecting the upper clamping member and the lower clamping member to each other.
According to this feature, by tightening the connecting bolts and nuts connecting the upper clamping member and the lower clamping member from above, the flange reinforcing device can be attached to the flanges at both the upper and lower ends of the connecting member and the upper and lower ends of the conduit component. It can be easily attached to the flange joint from above to reinforce the flange joint from above and below.

An installation tool used in the method for installing the flange reinforcing device, comprising:
a rod member disposed in the vertical direction, the tip of which can fit into the notch of the divided body from the side;
a pair of support members provided at the tip of the rod member and capable of supporting both upper and lower surfaces of the divided body in a state where the tip of the rod member is fitted into the notch; It is characterized by being equipped with supporting tools.
According to this feature, the pair of divided bodies can be supported using two hanging tools and can be easily opened/closed or moved downward. Further, by inserting a vertically long hanging support tool into a narrow space from above, both divided bodies can be easily attached to the flange joint.

An installation tool used in the method for installing the flange reinforcing device, comprising:
a first rod member disposed in the vertical direction;
a first bolt-nut holding member that is attached to the lower end of the first rod member and has a downward recess on the upper surface that can hold either the head of the bolt or the nut while preventing rotation;
a plurality of upper and lower rod connecting members attached to the first rod member;
a second rod member substantially parallel to the first rod member, which is vertically movable and rotatably supported by each of the rod connecting members;
a second bolt that is attached to the lower end of the second rod member and has an upward recess opposite to the downward recess on the lower surface thereof, which is capable of holding the other of the bolt head and the nut in a rotation-stopping manner; a nut holding member;
The present invention is characterized in that it includes a fastening tool comprising: an operation handle provided at the upper end of the second rod member; and a fastening tool.
According to this feature, the bolt and nut are held in opposition by the first bolt and nut holding member of the first rod member and the second bolt and nut holding member of the second rod member, and are easily attached to the divided body. After that, the bolt and nut can be continuously tightened by the second bolt and nut holding member of the second rod member. Further, by inserting a vertically long fastening tool into a narrow space from above, it is possible to easily perform bolt and nut installation and tightening operations.

The first rod member is characterized in that it has a shaft holding member that holds the shaft of the connection bolt so that it can be inserted and removed from the side.
According to this feature, the bolt held by the first or second bolt/nut holding member is prevented from falling down, so even if the shaft of the bolt is long, the notch of the split body can be easily accessed from the side. Can be fitted.

In addition, in order to solve the above problems, the method for installing a flange reinforcing device of the present invention includes:
A method for attaching a flange reinforcing device for reinforcing a flange of a pipe constituting member and a flange of a connecting member joined thereto by sandwiching them from above and below between a pair of pinching members of a pair of upper and lower pinching members, the method comprising:
a first step of temporarily connecting the pair of upper and lower holding members with bolts and nuts from above and below so that they can move relative to each other in the above and below directions;
a second step of holding and suspending the temporarily connected upper and lower clamping members by a lower end of a suspension support tool facing in the vertical direction;
moving the upper and lower clamping members suspended by the suspension support tool to the sides of the upper and lower flange joints, and inserting the upper and lower clamping parts into the outer diameter portions of the upper and lower flanges from the side; Step 3 and
A fourth step of tightening the temporarily connected bolt and nut from above using a fastening tool while preventing them from rotating together, and clamping the upper and lower flange joints with the upper and lower clamping parts. .
According to this feature, by carrying out the first to fourth steps, the flange reinforcing tool consisting of a pair of upper and lower holding members can be easily attached to the flange joint between the conduit component and the connecting member from above. When installed, the flange joint can be reinforced from above and below. Therefore, for example, even if the pipe constituting members and connecting members are installed in a narrow space and a large working space is not secured around their flange joints, the valve chamber can be easily removed without destroying or removing it. The work of installing the flange reinforcing tool can be done efficiently, improving work efficiency.

An installation tool used in the method for installing the flange reinforcing device, comprising:
a rod member disposed in the vertical direction; and a pair of upper and lower supports that are attached to the lower end of the rod member and can support the side ends of the upper and lower clamping members opposite to the clamping parts by laterally sandwiching them. The present invention is characterized by comprising a hanging support tool composed of a member and a suspension support tool.
According to this feature, even if there is not a large space around the flange joint where the flange reinforcing tool is attached, the clamping member can be held by the pair of upper and lower support members attached to the lower end of the vertically long hanging support tool. It can be held and easily attached from the side to the upper and lower flange joints.

An installation tool used in the method for installing the flange reinforcing device, comprising:
a rod member disposed in the vertical direction; a socket that is attached to the lower end of the rod member and that can be fitted from above to the head or nut of a bolt that temporarily connects a pair of upper and lower holding members; , an operation handle provided at the upper end of the rod member, and a fastening tool.
According to this feature, even if there is not a large space around the flange joint where the flange reinforcing tool is attached, a vertically long fastening tool can be inserted from above into the narrow space and the socket attached to the lower end can be used. This allows bolts or nuts to be easily tightened from above.

An installation tool used in the method for installing the flange reinforcing device, comprising:
The rod member of the hanging support tool and the rod member of the fastening tool are arranged in a plurality of upper and lower positions so that the rod members are parallel to each other and the fastening tool is movable in the vertical direction with respect to the hanging support tool. The suspension tool and the fastening tool are integrated by being connected by a rod connecting member.
According to this feature, by using a mounting tool in which a hanging support tool and a fastening tool are integrated, the lifting support tool can hold and move a pair of upper and lower clamping members downward, and the fastening tool can perform bolt and Nut tightening work can be performed continuously without changing tools, improving work efficiency.

(a) is a side view of the flange reinforcing device installed on the repair valve, fire hydrant, and branch neck using the flange reinforcing device installation method and installation tool of Example 1, and (b) is a side view of the flange reinforcing device installed. It is a side view showing a target repair valve, a fire hydrant, and a branch neck. FIG. 3 is a perspective view of the entire flange reinforcing device. (a) is a plan view of the divided body constituting the upper holding member, (b) is a left side view, (c) is a right side view, (d) is a front view, (e) is a bottom view, (f) is a bottom view of the main part of the divided body constituting the lower clamping member. (a) is a side view of the first suspension support tool, and (b) is a side view of the second suspension support tool. (a) is a side view of the first fastening tool, and (b) is a side view of the second fastening tool. 5 is a sectional view taken along line AA in FIG. 4. FIG. FIG. 5B is a sectional view taken along line BB in FIG. 5(b). It is a top view which shows the 1st process, and the state which the divided body of a lower clamping member is suspended by the 1st suspension support tool, and opened. 9 is a sectional view taken along line CC in FIG. 8. FIG. The second step is shown, in which the divided body of the lower clamping member is moved to the lower flange joint in an open state by the first hanging support tool, and then closed, and the lower clamping member is temporarily placed at the lower flange joint. FIG. It is a side view which shows the 3rd process, and the bolt and nut are held by the 1st fastening tool, and the other end of the split body is temporarily connected. It is a side view which shows the 4th process, and the state where the bolt and nut which connect the both ends of a split body are tightened by the 1st fastening tool. It is also a plan view. FIG. 7 is a plan view of the divided body of the upper clamping member in an open state suspended by a pair of second suspension tools. 15 is a sectional view taken along line DD in FIG. 14. FIG. It is a side view which shows the 5th process, and the state where the upper and lower clamping members were positioned using the 2nd hanging support tool. It is a side view which shows the 6th process, and the state where the connection bolt and nut are held by the 2nd fastening tool. It is a top view which shows the 7th process, and the state where the connection bolt and nut held by the 2nd fastening tool are fitted into the notch part of the upper and lower clamping members from the side. FIG. 6 is a side view of a state in which the connecting bolt and nut are tightened using a second fastening tool, and upper and lower clamping members are attached to the flange joint. FIG. 7 is a side view of the flange reinforcing device mounted on the flange joint by the flange reinforcing tool mounting method and mounting tool of Example 2; (a) is a side view of the upper clamping member, (b) is a plan view, (c) is a sectional view taken along EE, (d) is a side view of the lower clamping member, and (e) is a plan view. , (f) are FF sectional views, and (g) is a sectional view showing the upper and lower holding members connected. It is a side view of the installation tool which consists of a suspension tool and a fastening tool. 23 is a sectional view taken along line GG in FIG. 22. FIG. 23 is a sectional view taken along line HH in FIG. 22. FIG. Using the first to fourth steps of the flange reinforcing tool mounting method of Example 2 and the mounting tool consisting of a suspension tool and a fastening tool, a flange reinforcing tool consisting of upper and lower clamping members was attached to the flange joint. It is a side view of a state. FIG. 3 is a side view showing an excavation tool for excavating a buried object in the valve chamber.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for mounting a flange reinforcing tool and a mounting tool used therein according to the present invention will be described below based on examples.

A method for installing a flange reinforcing tool according to Example 1 and a mounting tool used therein will be described with reference to FIGS. 1 to 19 and FIG. 26. First, as shown in FIG. 1, a substantially horizontal branch flange 3c provided at the upper end of the branch neck 3b of the fluid pipe 3, which is a pipe constituting member, has a substantially horizontal lower end of a repair valve 4, which is a connecting member. A substantially horizontal flange 4c at the upper end of the repair valve 4 is connected to a substantially horizontal flange 4d at the lower end of the fire hydrant 2, which is a pipe constituting member, and a branch flange of the fluid pipe 3. 3c and the flange 2d of the fire hydrant 2 are connected and reinforced by a flange reinforcing tool 10. The branch neck 3b of the fluid pipe 3, the repair valve 4, and the fire hydrant 2 are installed in a narrow valve chamber 20 (see FIG. 10). Although the flanges 3c and 4c and the flanges 2d and 4d are connected by a plurality of bolts and nuts, the bolts and nuts are omitted for convenience in this embodiment.

Here, the fluid pipe 3 may be an existing fluid pipe or a newly installed fluid pipe, and is made of ductile cast iron that is buried underground, has a substantially circular cross-sectional shape, and has an inner circumferential surface covered with a mortar layer. has been done. The fluid pipe according to the present invention may be made of other metals such as cast iron or steel, concrete, vinyl chloride, polyethylene, or polyolefin. Furthermore, the inner circumferential surface of the fluid tube is not limited to the mortar layer, and may be coated with, for example, an epoxy resin or the like, or an appropriate material may be coated on the inner circumferential surface of the fluid tube by powder coating. In addition, although the fluid in the fluid pipe is clean water in this embodiment, it is not limited to the clean water in this embodiment, and can also be, for example, industrial water, agricultural water, sewage, etc., as well as gas or a gas-liquid mixture of gas and liquid. It doesn't matter.

As shown in FIGS. 1(a) and 2, the flange reinforcing device 10 used to implement the method of the present invention includes an upper clamping member 11 that clamps the flange 2d of the fire hydrant 2 in the vertical direction, which is the axial direction of the pipe. , a lower clamping member 14 that vertically clamps the branch flange 3c of the fluid pipe 3, a connecting member 17 that connects the upper clamping member 11 and the lower clamping member 14, and the later-described divided bodies 12 and 12' are integrally connected. It is mainly composed of a coupling member 18 that constitutes an annular upper clamping member 11 and a lower clamping member 14. The connecting member 17 is made up of a long connecting bolt 17a facing in the vertical direction and a nut 17b screwed onto it, and the connecting member 18 is made up of a short bolt 18a facing in the vertical direction and a nut 18b screwed into it. It is configured.

The upper clamping member 11 and the lower clamping member 14 will be explained below. Note that the lower clamping member 14 basically has the same structure as the upper clamping member 11 and is attached in an upside-down state, so only the upper clamping member 11 will be described in detail.

As shown in FIG. 2, the upper clamping member 11 is composed of divided bodies 12, 12' divided into two in the circumferential direction, and both divided bodies 12, 12' are a bolt 18a and a nut 18b (FIG. (See (a)) to form a cyclic structure.

As shown in FIGS. 2 and 3, one of the divided bodies 12 has clamping parts 12a and 12a' formed at two locations in the circumferential direction so as to face inward in the radial direction, and clamping parts 12a and 12a'. Clamping flanges 12c, 12c' are formed at two locations in the circumferential direction so as to face radially outward at corresponding circumferential positions, and have stepped surfaces whose upper surfaces are lower than the upper surfaces of the clamping parts 12a, 12a'; A connecting arm part 12b that connects the base of the clamping part 12a and the base of the other clamping part 12a', and an arm part 12d extending from the base of one clamping part 12a in the opposite direction to the other clamping part 12a'. We are prepared. Note that the divided body 12 may be provided with one or more than two clamping parts 12a and clamping collar parts 12c.

The clamping parts 12a, 12a' are composed of two projecting parts 12e, 12e that protrude radially inward from the upper end edge of the base of the clamping part 12a. Moreover, protrusions 12j, 12j that protrude inward in the radial direction are formed on the lower end edge of the base of one of the holding parts 12a. Furthermore, the clamping collars 12c, 12c' protrude outward from the bases of the clamping parts 12a, 12a', and the shafts of the connecting bolts 17a are attached to the clamping collars 12c, 12c' from the outer diameter side. A fittable notch 12f is formed that is cut out from the outer diameter direction toward the inner diameter direction. The outer edges of the walls 12k, 12k forming the notch 12f in the clamping flanges 12c, 12c' are provided with an upwardly protruding portion to prevent the head of the connecting bolt 17a or the nut 17b from moving in the outer radial direction. A convex portion 12m is provided respectively.

Further, the connecting arm portion 12b is formed in a substantially arc shape so as to connect the lower end of the base of one clamping portion 12a and the lower end of the base of the other clamping portion 12a'. Further, the arm portion 12d is formed in a substantially arc shape extending from the upper end of the base of one of the clamping portions 12a in a substantially horizontal direction and having the same diameter and concentricity as the connecting arm portion 12b. Furthermore, a coupling part 12g that protrudes in the circumferential direction from the lower end of the arm part 12d is formed at the end of the arm part 12d, and a through hole 12h that penetrates in the vertical direction is formed in the coupling part 12g. There is. Further, a coupling part 12p that protrudes in the circumferential direction from the upper end of the base of the other clamping part 12a' is formed at the end of the base of the other clamping part 12a'. A through hole 12q passing through is formed. That is, the coupling portion 12p is provided near the clamping collar portion 12c'.

Further, the other divided body 12' has the same configuration as the divided body 12. In particular, as shown in FIG. 2, when joining these divided bodies 12 and 12', the through hole is Insert the bolt 18a from above 12h and 12q and tighten the nut 18b from below. Similarly, with the connecting portion 12p of the divided body 12 and the connecting portion 12g of the divided body 12' stacked vertically, the bolt 18a is inserted from above the through holes 12h and 12q, and the nut 18b is tightened from below. At this time, the joint 12p of the divided body 12 is located above (outside in the pipe axis direction) the joint 12g of the divided body 12', and the joint 12p of the divided body 12' is located at the joint 12g of the divided body 12. 12g (outside in the axial direction of the pipe). Here, the bolt 18a may be inserted from below and the nut 18b may be tightened from above.

By combining these divided bodies 12 and 12', the upper clamping member 11 having an annular shape when viewed from above is constructed. The base of each clamping part 12a, 12a' of the divided bodies 12, 12', each connecting arm part 12b, and each arm part 12d are main bodies forming the upper clamping member 11 in an annular shape. The coupling portions 12g and 12p are provided on an extension line of the main body extending in the circumferential direction. Note that the lower clamping member 14 basically has the same structure as the upper clamping member 11 and is installed upside down, so a detailed explanation thereof will be omitted. However, as shown in FIG. 3(f), the head 17c of the connecting bolt 17a is fitted from below to the lower surface of the clamping flange 12c in which the notch 12f of the lower clamping member 14 is formed to prevent rotation. This is different from the upper holding member 11 in that a rotation preventing recess 12n is formed therein.
The lower clamping member 14 is connected to the upper clamping member 11 by a connecting bolt 17a and a nut 17b with the divided bodies 12, 12' connected as described above upside down.

Next, a first embodiment of a method for attaching the flange reinforcing tool 10 to the above-mentioned flange joint and a tool used therein will be described. In this embodiment, the flange reinforcing device 10 is attached within the relatively narrow space of the valve chamber 20 that is approximately rectangular in plan view and surrounds the branch neck portion 3b of the fluid pipe 3, the repair valve 4, and the fire hydrant 2. explain.

First, the installation tool will be explained with reference to FIGS. 4 to 7.

4A shows a first suspension tool 30 that suspends the lower clamping member 14, and FIG. 4B shows a second suspension tool 40 that suspends the upper clamping member 11. Here, in the present application, "suspension" means supporting in a suspended state. The first hanging support tool 30 includes a rod member 30a whose length in the vertical direction is longer than the depth of the valve chamber 20 by a predetermined dimension, a clamping collar 12c of the lower clamping member 14 fixed to the lower end of the rod member 30a, A hexagonal nut-shaped lower support member 30b that is fitted into the anti-rotation recess 12n (see FIG. 3(f)) formed on the lower surface of 12c' and supports the lower surface, and a rod above the lower support member 30b. It is fitted to the member 30a so as to be movable in the vertical direction and rotational direction, and is fitted from above to the stepped surface of the upper surface of the middle portion of the clamping flange portions 12c, 12c' of the divided bodies 12, 12' of the lower clamping member 14. , and a flat upper support member 30c whose movement in the outer radial direction is restricted by the convex portion 12m. The planar shape of the upper support member 30c is approximately a horizontally long rectangle, as shown in FIG.

The second suspension support tool 40 has a vertical rod member 40a having approximately the same length as the rod member 30a of the first suspension support tool 30, and is fixed slightly above the lower end of this rod member 40a, and is secured to an upper part clamping member. A lower support member 40b supports from below the stepped surface of the lower surface of the intermediate clamping flange portions 12c and 12c' of the divided bodies 12 and 12' of the member 11, and whose movement in the outer radial direction is restricted by the convex portion 12m. , is fitted to the rod member 40a above the lower support member 40b so as to be movable in the vertical and rotational directions, and is fitted upwardly into the stepped surface of the upper surface of the intermediate clamping collar portions 12c, 12c' of the divided bodies 12, 12'. The flat upper support member 40c is fitted with the upper support member 40c, and movement in the outer radial direction is restricted by the convex portion 12m.

The planar shapes of the lower support member 40b and the upper support member 40c are substantially the same as the upper support member 30c of the first suspension tool 30. In addition, the second suspension support tool 40 also serves as a positioning tool for vertically aligning the notches 12f formed in the divided bodies 12, 12' of the upper clamping member 11 and the lower clamping member 14, A portion of the rod member 40a that protrudes downward from the lower support member 40b is used as a positioning portion 40d that is inserted into the notch 12f of the lower clamping member 14 from above. Further, the diameters of the rod members 30a, 40a of the first and second suspension tools 30, 40 are slightly smaller than the opening width of the notch 12f formed in the divided bodies 12, 12'. Note that the lower support member 40b may also be used for positioning by having a structure that fits into the stepped surface of the lower support member 40b.

FIG. 5(a) shows a first fastening tool 50 for tightening the bolt 18a and nut 18b connecting the ends of the divided bodies 12, 12', and FIG. 5(b) shows the upper clamping member 11 and the lower clamping tool 50. A second fastening tool 60 for tightening the connecting bolt 17a and nut 17b connecting the members 14 is shown. Note that the first fastening tool 50 and the second fastening tool 60 each include a bolt 18a and a nut 18b that connect one end of the divided bodies 12 and 12', and an upper clamping member 11 and a lower clamping member 14. It also serves as a bolt/nut fitting that holds the connecting bolt 17a and nut 17b that connect the two and attaches it to the flange reinforcing tool 10.

The first fastening tool 50 includes a first rod member 50a whose length in the vertical direction is longer than the depth of the valve chamber 20 by a predetermined dimension, and is attached substantially horizontally to the lower end of the first rod member 50a so as to face sideways. A first bolt-nut holding member 50c having an upwardly-opening downward recess 50b capable of holding the head of the nut 18b or bolt 18a while preventing rotation, and a first bolt-nut holding member 50c on the first rod member 50a. A plurality of upper and lower rod connecting members 50d are mounted substantially horizontally so as to face in the same direction as the member 50c, and a first rod member is vertically movable and rotatably supported at the tip of each rod connecting member 50d. A second rod member 50e that is substantially parallel to and longer than 50a, and a second rod member 50e that is attached to the lower end of the second rod member 50e and that can hold the head of the bolt 18a or the nut 18b on the lower surface while preventing rotation. It is composed of a second bolt/nut holding member 50g having an upward recess 50f facing the downward recess 50b, and an operating handle 50h attached to the upper end of the second rod member 50e. A spring plunger (not shown) is provided on the inner wall of the upward recessed portion 50f in a substantially horizontal direction, so that the head of the bolt 18a or the nut 18b is held and prevented from falling off. Note that the spring plunger is not necessarily provided; for example, the hole size of the recessed portion 50f may be set to be approximately the same as the head of the bolt 18a or the nut 18b so that it will not fall off due to frictional force, or the recessed portion 50f may be provided with a spring plunger. A magnet or the like may be provided on the inner surface of 50f to prevent the magnetic head of the bolt 18a or the nut 18b from easily falling.

The lowermost rod connecting member 50d is attached to the first rod member 50a so as to be movable in the vertical direction, and the lowermost rod connecting member 50d is attached to the first rod member 50a between the lowermost rod connecting member 50d and the upper rod connecting member 50d. A compression coil spring 50j is fitted onto the outside. A retaining member 50k that comes into contact with the lower surface of the lowermost rod connecting member 50d to prevent it from coming off is fixed to the lower end of the second rod member 50e. When the first rod member 50a is moved downward or the second rod member 50e is moved upward, the compression coil spring 50j is compressed and biased in the direction of elastic recovery. Note that the compression coil spring 50j may be omitted.

The second fastening tool 60 basically has the same configuration as the first fastening tool 50, and includes a first rod member 60a, a first bolt/nut holding member 60c having a downward recess 60b, and a plurality of upper and lower rods. a connecting member 60d, a second rod member 60e that is vertically movable and rotatably supported by each rod connecting member 60d and substantially parallel to the first rod member 60a; It is composed of a second bolt/nut holding member 60g having a recessed portion 60f, an operating handle 60h attached to the upper end of the second rod member 60e, and a retaining member 60k fitted to the second rod member 60e. There is.

A head 17c of a connecting bolt 17a or a nut 17b that connects the upper clamping member 11 and the lower clamping member 14 is fitted into the downward recess 60b of the first bolt/nut holding member 60c so as not to rotate. Further, a nut 17b or a head 17c of a connecting bolt 17a that connects the upper clamping member 11 and the lower clamping member 14 is fitted into the upwardly directed recess 60f of the second bolt-nut holding member 60g so as to prevent rotation. A spring plunger (not shown) is provided on the inner wall of the upward recessed portion 60f in a substantially horizontal direction so that the nut 17b or the head 17c of the connecting bolt 17a is held and prevented from falling off. Note that the spring plunger is not necessarily provided, and for example, the hole size of the recess 60f may be set to be approximately the same as the head 17c of the nut 17b or the connecting bolt 17a so that it will not fall off due to frictional force, or A magnet or the like may be provided on the inner surface of the upward concave portion 60f to prevent the magnetic nut 17b or the head 17c of the connecting bolt 17a from easily falling. As shown in FIG. 7, the lower end of the first rod member 60a has an outward U-shaped opening in plan view that can hold the vertically intermediate portion of the shaft portion 17d of the connecting bolt 17a. A shaft holding member 60n having a holding groove 60m is attached. Note that if the connecting bolt 17a is relatively short, the shaft holding member 60n may be omitted.

Next, with reference to FIGS. 8 to 13, the procedure for attaching the lower clamping member 14 of the flange reinforcing device 10 will be described. Before installation, the lid (not shown) closing the upper surface of the valve chamber 20 is removed to open the upper surface of the valve chamber 20. Furthermore, if the joint between the branch flange 3c of the branch neck 3b of the fluid pipe 3 and the flange 4c at the lower end of the repair valve 4 is buried underground, the area around it is excavated to expose it. As the excavation tool, a tool composed of a long rod member similar to the above-mentioned tool may be employed. For example, an excavation tool 80 shown in FIG. 26 has a pair of rod members 81 and 82 arranged parallel to each other. The proximal end portion 84a of the bucket 84 is rotatably supported at the lower end of one rod member 81 via a link member 83, and the other rod member 81 is configured to be movable relative to each other in the axial direction. The upper end portion 84b of the bucket 84 is rotatably supported and attached to the lower end of the bucket 82. By doing this, by relatively moving these rod members 81 and 82 in the axial direction and rotating the bucket 84, excavation work for buried objects G such as earth and sand buried in the valve chamber 20 can be carried out. This can be done from above. Note that the excavation work is preferably performed until at least the lower branch neck 3b of the branch flange 3c of the fluid pipe 3 is exposed, so that the flange reinforcing tool 10 can be attached.

First, in a process before attaching the lower clamping member 14, the bolt 18a and nut 18b are inserted from above to connect the connecting parts 12p and 12g at one end of the divided bodies 12 and 12' constituting the lower clamping member 14. Temporarily connect it loosely. The connecting parts 12p and 12g at the other ends of the divided bodies 12 and 12' are left open without being connected so that they can be opened and closed using the temporary connecting part as a fulcrum (see FIG. 8).

Next, in the first step, as shown in FIG. 8 and FIG. The lower end of the member 30a is fitted from the outer diameter side, the lower support member 30b is fitted into the anti-rotation recess 12n formed on the lower surface of the clamping collars 12c, 12c', and the upper support member 30c is fitted. The clamping flanges 12c, 12c' of the divided bodies 12, 12' are fitted from above into the stepped surfaces of the upper surfaces, and both the divided bodies 12, 12' are suspended by a pair of first suspension tools 30, 30. .

Next, in the second step, as shown in FIG. 8, both the divided bodies 12, 12' suspended by the first suspension tools 30, 30 are opened with the temporary connection part as a fulcrum, and then As shown in FIG. 3, while gripping the rod member 30a of each first suspension tool 30, connect the two divided bodies 12, 12' between the branch flange 3c of the fluid pipe 3 and the flange 4c at the lower end of the repair valve 4. After being lowered to the vicinity of the joint, both the divided bodies 12, 12' are closed and fitted from the side to the outer diameter portions of the branch flange 3c and the flange 4c at the lower end of the repair valve 4, and temporarily placed. At this time, the protrusions 12j, 12j of both the divided bodies 12, 12' are temporarily placed in contact with the upper surface of the flange 4c of the repair valve 4. Since both the divided bodies 12, 12' can be moved downward in an open state using the temporary connection part as a fulcrum, interference with the fire hydrant 2 and the repair valve 4 can be avoided even if the width inside the valve chamber 20 is small. can be moved downward.

Next, in the third step, as shown in FIG. 11, the other end of both the divided bodies 12, 12' is The head of the bolt 18a that connects the bolts 18a is held, and the nut 18b screwed onto the bolt 18a is fitted and held by the downward recess 50b of the first bolt-nut holding member 50c of the first fastening tool 50. do. Thereafter, the first fastening tool 50 is gripped and moved downward, the bolt 18a is inserted from above into the through holes 12h and 12q at the other end of both the divided bodies 12 and 12', and the held nut 18b is inserted. It is screwed into the lower end of the bolt 18a to temporarily connect the other ends of both the divided bodies 12, 12'. In this third step, contrary to the above, the head of the bolt 18a may be held by the downward recess 50b, and the nut 18b may be held by the upward recess 50f.

Next, in the fourth step, as shown in FIGS. 12 and 13, using the first fastening tool 50, the downward recess 50b of the first bolt-nut holding member 50c is inserted into the nut 18b. With the upward concave portions 50f of the bolt/nut holding member 50g fitted into the heads of the bolts 18a, the operation handle 50h at the upper end of the second rod member 50e is rotated, and both ends of the two divided bodies 12, 12' are rotated. Tighten the bolt 18a and nut 18b connecting the parts. At this time, the nut 18b is fitted into the upwardly directed recess 50b of the first bolt/nut holding member 50c to prevent co-rotation, so that it can be easily tightened. Moreover, the rotation of the lower clamping member 14 in the circumferential direction can be suppressed by the pair of first suspension tools 30, 30, and the lower clamping member 14 can be easily tightened. Note that a torque wrench may be used for tightening. Through this fourth step, the lower clamping member 14 is temporarily attached to the joint between the branch flange 3c and the flange 4c at the lower end of the repair valve 4 so as to be rotatable in the circumferential direction.

In this manner, by carrying out the first to fourth steps, the lower clamping member 14 constituting the flange reinforcing tool 10 is attached to the flange joint between the branch flange 3c and the flange 4c at the lower end of the repair valve 4. A member that can be easily installed from above and reinforces the flange joint from above and below can be installed. Therefore, as in the first embodiment, even if the fire hydrant 2 and the repair valve 4 are installed in the narrow space of the valve chamber 20 and a large work space is not secured around their flange joints, the flange reinforcement The attachment work of the tool 10 can be performed efficiently, and work efficiency is improved.

After temporarily attaching the lower clamping member 14 to the joint between the branch flange 3c and the flange 4c at the lower end of the repair valve 4, the upper clamping member is attached to the joint between the flange 4d at the upper end of the repair valve 4 and the flange 2d of the fire hydrant 2. Both divided bodies 12, 12' forming part 11 are attached. In this case, the steps are the same as the first to fourth steps for the lower clamping member 14, except that the second suspension tool 40 described above is used to suspend both the divided bodies 12, 12' of the upper clamping member 11. Since it is attached in a step-by-step manner, a detailed explanation of the process will be omitted.

When suspending both the divided bodies 12 and 12' of the upper clamping member 11, as shown in FIGS. 14 and 15, the rod member 40a of the second suspension support tool 40 is 12, 12' is fitted into the notch 12f at the intermediate part from the outer diameter side, and the stepped surface between the lower and upper surfaces of the clamping flange 12c, 12c' at the intermediate part of both the divided bodies 12, 12' is supported by the lower part. It is held and supported by the member 40b and the upper support member 40c. At this time, the upper support member 40c, which is fitted to the rod member 40a so as to be movable in the vertical direction, may be moved upward at one end and then moved downward. Further, since the lower support member 40b and the upper support member 40c are restricted from moving in the outer radial direction by the convex portion 12m, as shown in FIG. When opening with the suspension support tools 40, 40, there is no risk that the rod member 40a will come off from the notch 12f.

In the fifth step after the upper holding member 11 is attached to the joint between the flange 4d at the upper end of the repair valve 4 and the flange 2d of the fire hydrant 2, as shown in FIG. 16, a pair of second suspension tools are attached. 40, 40 are attached to the divided bodies 12, 12' of the upper holding member 11, the rod members 40a, 40a of the second hanging support tools 40, 40 are moved downward, and the positioning portions of their lower ends are moved downward. 40d is inserted into the notch 12f of the divided bodies 12, 12' of the lower holding member 14 from above. As a result, the notches 12f of the divided bodies 12, 12' of the upper clamping member 11 and the lower clamping member 14 are positioned and vertically aligned. Note that when the rod member 40a of the second hanging support tool 40 is moved downward, the upper support member 40c is moved upward, so that the positioning portion 40d can be inserted into the cutout portion 12f of the lower clamping member 14 without any problem.

In this way, by positioning the divided bodies 12, 12' of the upper clamping member 11 and the lower clamping member 14 in the circumferential direction and aligning the notches 12f, it is possible to accurately tighten the connecting bolt 17a across these notches 12f. Can be installed on.

Next, in the sixth step, as shown in FIG. The head 17c of the vertical connecting bolt 17a connecting the connecting bolts 12 and 12' is fitted and held, and the intermediate part of the shaft 17d of the connecting bolt 17a is held by the shaft holding member of the second fastening tool 60. It is held by a 60n holding groove 60m (see FIG. 7). At the same time, the nut 17b that is screwed onto the connecting bolt 17a is fitted into the upward recess 60f of the second bolt/nut holding member 60g of the second fastening tool 60, so that the nut 17b is coaxially opposed to the connecting bolt 17a. to hold. Note that this work will be performed on the ground surface. In this sixth step, contrary to the above, the head 17c of the connecting bolt 17a may be held by the upward recess 60f, and the nut 17b may be held by the downward recess 60b.

Next, grasp the second fastening tool 60 holding the connecting bolt 17a and nut 17b, and pull the connecting bolt 17a to the side adjacent to the upper clamping member 11 and the lower clamping member 14, as shown in FIG. After moving it downward, in a seventh step, as shown in FIG. It fits into the notch 12f of the body 12, 12' from the side, which is the outer diameter side. At this time, since the shaft portion 17d of the connecting bolt 17a is held by the shaft portion holding member 60n, there is no risk of the connecting bolt 17a falling down. Further, the upper and lower notches 12f are vertically positioned and aligned by the second suspension tools 40, 40 to suppress rotation in the circumferential direction, so that the shaft portion 17d can be easily fitted into the upper and lower notches 12f. can be matched.

After fitting the shaft portion 17d into the upper and lower notches 12f, the operation handle 60h of the second rod member 60e of the second fastening tool 60 is rotated to remove the nut held by the second bolt-nut holding member 60g. 17b is screwed onto the upper part of the connecting bolt 17a to temporarily connect the upper and lower divided bodies 12, 12'. Note that, since the cutout portions 12f of the upper and lower divided bodies 12, 12' are formed at four locations in the circumferential direction, this operation is repeatedly performed while removing the second hanging support tool 40 as necessary. For example, the second hanging support tool 40 may be removed after connecting the two connecting bolts 17a and nuts 17b. However, the notch portions 12f are not limited to being formed at four locations in the circumferential direction.

Finally, if the four nuts 17b are sequentially tightened by the second bolt/nut holding member 60g of the second fastening tool 60, the installation of the flange reinforcing tool 10 is completed and the upper clamping member is tightened, as shown in FIG. 11 and the lower clamping member 14, the flange 2d of the fire hydrant 2 and the branch flange 3c of the fluid pipe 3 are clamped from both upper and lower directions, and the flanges 4c, 4d of the repair valve 4, the flange 2d of the fire hydrant 2, and the fluid pipe 3 The flange joint with the branch flange 3c is reinforced. Note that instead of tightening the nut 17b using the second fastening tool 60, a vertically long dedicated tightening tool may be used to tighten the nut 17b. No matter which tool is used to tighten the nut 17b, the head 17c of the connecting bolt 17a is attached to the anti-rotation recess 12n (see FIG. (see f)) to prevent co-rotation, the nut 17b can be easily tightened from above. Note that a torque wrench may be used for tightening.

As explained above, according to the method for attaching the flange reinforcing device of the first embodiment, by performing the first to seventh steps described above, the shaft portion 17d of the connecting bolt 17a is attached to the outer peripheral surface from the outer diameter side. It has divided bodies 12, 12' in which fittable notches 12f are formed, and the ends of the divided bodies 12, 12' in the circumferential direction are connected to each other by bolts 18a and nuts 18b to form an annular shape. The upper and lower parts of the repair valve 4 are tightened by tightening the connecting bolts 17a and nuts 17b that connect the upper and lower clamping members 11 and 14 together from above. It can be easily attached to the flange joint between the flanges 4c and 4d, the flange 2d of the fire hydrant 2, and the branch flange 3c of the fluid pipe 3 within the valve chamber 20 from above the valve chamber 20. Therefore, even if the internal space of the valve chamber 20 is narrow and a large work space is not secured around the fire hydrant 2 or the repair valve 4, the work of installing the flange reinforcing device 10 can be carried out efficiently, improving work efficiency. do.

In addition, the first suspension tool 30, the second suspension tool 40 that also serves as a positioning tool, the first fastening tool 50, and the second fastening tool 60 of the first embodiment all have a rod shape that is long in the vertical direction. Therefore, even if the internal space of the valve chamber 20 is narrow and there is no large space around the fire hydrant 2 or repair valve 4, these tools can be inserted into the valve chamber 20 from above and the flange reinforcing device 10 can be installed. Can be easily attached to flange joints.

A method for installing a flange reinforcing tool and a mounting tool used therein according to the second embodiment will be described with reference to FIGS. 20 to 25. Note that configurations similar to those of the first embodiment described above are given the same reference numerals as those of the first embodiment, and redundant explanations will be omitted. In this second embodiment, a flange reinforcing tool 70 different from that in the first embodiment is attached to the joint between the branch flange 3c of the fluid pipe 3 and the flange 4c at the lower end of the repair valve 4.

The flange reinforcing tool 70 used in the method of Example 2 includes an upper clamping member 71 shown in FIGS. 21(a) to 21(c) and a lower clamping member 71 shown in FIGS. 21(d) to 21(f). A pair of flange reinforcing tools 70 are attached to the joint between the branch flange 3c and the flange 4c. The upper holding member 71 is integrally connected to a main body part 71c whose upper surface is closed by an upper wall part 71a and has a circular fitting hole 71b that opens downward inside, and an outer peripheral surface of the upper part of the main body part 71c. A through hole 71e, through which a shaft 73a of a connecting bolt 73 (described later) is inserted, is formed in the center of the upper wall 71a. Furthermore, a fitting groove 71f is formed on the inner surface of the fitting hole 71b, which faces in the vertical direction and is recessed in a direction opposite to the protruding direction of the holding portion 71d. Furthermore, an upward protrusion 71g that is held by a holding member 76c of a hanging support tool 76, which will be described later, is provided on the upper surface of the main body 71c on the opposite side to the holding part 71d. The substantially horizontal lower surface of the holding portion 71d is made into an uneven surface to prevent slipping.

The lower clamping member 72 includes a main body part 72a that is fitted into the fitting hole 71b of the upper clamping member 71, and a main body part 72a that protrudes outward from the lower end of the main body part 72a. The body portion 72a includes a holding portion 72b paired with a portion 71d, and a vertical through hole 72c through which a shaft portion of a connecting bolt 73 (described later) is inserted is formed in the main body portion 72a. The lower part of the through hole 72c is a hexagonal hole 72d into which a head of a connecting bolt 73 or a nut 74 (described later) is fitted to prevent rotation. A vertical protrusion 72e that is fitted into the fitting groove 71f of the upper holding member 71 is formed on the side surface of the main body part 72a opposite to the holding part 72b. The substantially horizontal upper surface of the holding portion 72b is made into an uneven surface to prevent slipping.

As shown in FIG. 21(g), the upper clamping member 71 and the lower clamping member 72 are used in a state where they are connected by a connecting bolt 73 and a nut 74. That is, the lower clamping member 72 is fitted into the fitting hole 71b of the upper clamping member 71 from below while the protrusion 72e of the lower clamping member 72 is fitted into the fitting groove 71f of the upper clamping member 71. After that, when the nut 74 is screwed onto the upper end of the connecting bolt 73 inserted into both the through holes 71e and 72c from below, the upper clamping member 71 and the lower clamping member 72 are connected. After the connection, since the protrusion 72e of the lower clamping member 72 is fitted into the fitting groove 71f of the upper clamping member 71, their relative rotation is prevented, and the clamping parts 71d and 72b are vertically aligned with each other. is maintained facing the Note that the connecting bolt 73 may be inserted from above and the nut 74 may be screwed onto the lower end.

Next, a mounting tool used in the mounting method of the second embodiment will be described with reference to FIGS. 22 to 24. This installation tool 75 is a tool that integrates a suspension tool 76 for suspending the flange reinforcing tool 70 and a fastening tool 77 for tightening the nut 74 or the connecting bolt 73. The hanging support tool 76 includes a rod member 76a that is long in the vertical direction, a substantially horizontal support member 76b that is attached to the lower end of the rod member 76a so as to protrude laterally and supports the lower end of the upper clamping member 71, and a support member 76b. It consists of a holding member 76c that holds the upper clamping member 71 and is attached to a rod member 76a slightly above the holding member 76a.

As shown in FIG. 23, the support member 76b is formed with a recess 76d that is semicircular in plan view and is fitted from the side into the main body 72a of the lower clamping member 72. In the fitted state from both sides, the lower end surface of the upper holding member 71 is supported by the upper surface of the holding member 76c (see FIG. 25). The holding member 76c has a pair of holding pieces 76e, 76e that are substantially parallel to each other and protrude in the direction of the supporting member 76b. The portion 71g is held from both sides (see FIG. 25).

The fastening tool 77 includes a vertically long rod member 77a, a socket 77c fixed to the lower end thereof and having an upward hexagonal hole 77b formed in the lower surface, and an operating handle 77d attached to the upper end of the rod member 77a. It consists of The rod member 77a of the fastening tool 77 is held so as to be movable and rotatable in the vertical direction and substantially parallel to the rod member 76a by a plurality of upper and lower connecting members 78 attached to the rod member 76a of the suspension support tool 76. ing. Further, a retaining member 79 is attached to the rod member 77a so that the rod member 77a does not come off from the connecting member 78.

Next, with reference to FIG. 25, a procedure for mounting the flange reinforcing tool 70 will be described. First, in a first step, the upper clamping member 71 and the lower clamping member 72 are temporarily connected using a connecting bolt 73 and a nut 74 . At this time, the nut 74 is loosened so that the clamping part 71d of the upper clamping member 71 and the clamping part 72b of the lower clamping member 72 can fit into the attached flanges 3c and 4c.

Next, in a second step, the upper surface of the support member 76b of the hanging support tool 76 supports the lower end surface of the upper clamping member 71 on the side opposite to the clamping part 71d, and also supports the pair of holding pieces 76e of the holding member 76c. As a result, the upward protrusion 71g of the upper clamping member 71 is clamped and held, and the upper and lower clamping members 71 and 72 are suspended by the suspension support tool 71.

Next, in the third step, the mounting tool 75 is gripped and the hanging support tool 71 is moved downward, and the clamping part 71d of the suspended upper clamping member 71 and the clamping part 72b of the lower clamping member 72 are connected to the flange. 3c and the outer diameter portion of the flange 4c from the side.

Next, in a fourth step, the fastening tool 77 is moved downward to tighten the nut 74 using the socket 77c at the lower end. At this time, since the head of the connecting bolt 73 is prevented from rotating within the hexagonal hole 72d in the lower part of the lower clamping member 72, the nut 74 can be easily tightened from above. In addition, in this fourth step, the nut 74 may be tightened using a dedicated fastening tool that is separate from the suspension tool 76 and is long in the vertical direction, or a torque wrench may be used for tightening. . When the first to fourth steps are repeated and the outer diameter parts of the flanges 3c and 4c on the opposite side are held between the holding part 71d of another upper holding member 71 and the holding part 72b of the lower holding member 72, the flange The outer diameter portions of the flange 3c and the flange 4c, which face each other at 180°, are strongly clamped and reinforced from above and below by a pair of flange reinforcing tools 70, 70 (see FIG. 20).

As explained above, according to the method for attaching a flange reinforcing tool of the second embodiment, by performing the first to fourth steps, the upper clamping member 71 and the lower clamping member 72 forming a vertical pair A flange reinforcing tool 70 consisting of the above is easily attached to the branch flange 3c of the fluid pipe 3 and the lower flange 4c of the repair valve 4 from the ground surface above the valve chamber 20, and the flange joint portion is attached to the valve chamber 20. It can be reinforced from above and below. Therefore, similarly to the mounting method of the first embodiment, even if the internal space of the valve chamber 20 is narrow and a large working space is not secured around the fire hydrant 2 or the repair valve 4, the mounting work of the flange reinforcing device 70 can be carried out. It can be done efficiently and work efficiency is improved. In addition, since the hanging support tool 76 and the fastening tool 77 of the second embodiment have a vertically long rod shape like the installation tool of the first embodiment, the internal space of the valve chamber 20 is narrow, and the fire hydrant 2 and Even if there is not a large space around the repair valve 4, the tools can be inserted into the valve chamber 20 from above and the flange reinforcing tool 70 can be easily attached to the flange joint. Further, the lower surface of the holding member 72 is formed with a tapered portion 72f that extends upward toward the outer diameter side, and by doing so, a socket portion is formed on the side of the branch neck portion 3b of the fluid pipe 3. It is easy to engage with the large diameter portion 3f.

Although the present invention has been described above based on Examples 1 and 2, the specific configuration is not limited to these Examples, and the following modifications may be made without departing from the gist of the invention. Even if there are various modifications and changes, they are included in the present invention.

For example, in the first embodiment, the repair valve 4 is used as a connecting member and the upper and lower flanges 4c, 4d are connected to the flange joints between the flange 2d of the fire hydrant 2 and the branch flange 3c of the fluid pipe 3, which are pipe constituting members. , an example was explained in which the flange reinforcing device 10 was attached, and in the second embodiment, an example was explained in which the flange reinforcing device 70 was attached to the branch flange 3c of the fluid pipe 3 and the lower flange 4c of the repair valve 4. The connecting member is not limited to the repair valve 4, but may also be a butterfly valve, a switching valve, a ball valve, etc., which have flanges on both the upper and lower ends, and there are no particular limitations on the member that is flanged to the upper part of these valves. . Further, the present invention may be applied when the connecting member is a fire hydrant, an air valve, etc., and is flange-connected to the branch flange 3c.

In the second embodiment, the flange reinforcement 70 is attached to the branch flange 3c of the fluid pipe 3 and the lower flange 4c of the repair valve 4. Of course, the present invention can also be applied to the case where the flange reinforcing tool 70 is attached to the flange 2d.

Further, in the first embodiment, an example was explained in which the lower clamping member 14 and the upper clamping member 11 are connected by the connecting member 17, but the upper clamping member 11 and the connecting member 17 may not be used. The present invention is also applicable to cases where only the lower clamping member 14 is attached as a flange reinforcing tool to a flange joint between a flange of a member and a flange of a connecting member joined thereto using a hanging support tool or a fastening tool. can. In this case, it is preferable to make the gap between the protruding part 12e and the protruding part 12j of the divided body 12 slightly larger than the thickness of the flange joint, and to sandwich the flange joint from above with bolts or set screws, for example. .

2 Fire hydrant (pipeline component)
2d Flange 3 Fluid pipe (pipe line component)
3b Branch neck 3c Branch flange 4 Repair valve (connection member)
4c, 4d Flange 10 Flange reinforcement 11 Upper clamping member 12, 12' Divided body 12a, 12a' Clamping part 12b Connecting arm part 12c, 12c' Clamping collar part 12d Arm part 12e Projection part 12f Notch part 12g Joint part 12j Projection Shaped portion 12m Convex portion 12n Detent recess 12p Connecting portion 14 Lower clamping member 17 Connecting member 17a Connecting bolt 17b Nut 17c Head 17d Shaft portion 18 Connecting member 18a Bolt 18b Nut 20 Valve chamber 30 First suspension tool 40 2. Hanging support tool 30a, 40a Rod member (rod)
30b, 40b Lower support members 30c, 40c Upper support member 40d Positioning portion 50 First fastening tool 60 Second fastening tool 50a, 60a First rod members 50b, 60b Downward recesses 50c, 60c First bolt/nut holding member 50d , 60d Rod connecting members 50e, 60e Second rod members 50f, 60f Upward recesses 50g, 60g Second bolt/nut holding members 50h, 60h Operation handle 50j Compression coil springs 50k, 60k Retaining member 60m Holding groove 60n Shaft holding member 70 Flange reinforcing tool 71 Upper clamping member 71a Upper wall part 71b Fitting hole 71c Main body part 71d Clamping part
71e Through hole 71f Fitting groove 71g Upward protrusion 72 Lower clamping member 72a Main body part 72b Clamping part 72c Through hole 72d Hexagonal hole 72e Projection 73 Connection bolt 74 Nut 75 Mounting tool 76 Hanging support tool 76a Rod member 76b Support member
76c Holding member (supporting member)
76d Recess 76e Holding piece 77 Fastening tool 77a Rod member 77b Hexagonal hole
77c Socket 77d Operating handle 78 Connecting member 79 Retaining member 80 Excavation tools 81, 82 Rod member 83 Link member 84 Bucket

Claims (2)

A lower clamping member is fitted onto flanges at both upper and lower ends of the connecting member of the valve, and a lower clamping member is fitted onto the lower flange joint portion of the pipe line forming member which is joined across both the upper and lower ends of the valve, respectively; A method for attaching a flange reinforcing tool for reinforcing a flange joint, which comprises at least an upper clamping member that is fitted onto an upper flange joint, and a connecting bolt and nut that connect the lower clamping member and the upper clamping member to each other. There it is,
Using a suspension tool, the lower clamping member is fitted from the side to the outer diameter portion of the lower flange joint of the conduit constituting member , and the protruding part of the lower clamping member is attached to the flange at the lower end of the valve. Temporarily place the lower clamping member in contact with the upper surface, and fit the upper clamping member from the side to the outer diameter portion of the upper flange joint of the conduit constituting member . a step of temporarily placing the upper holding member ;
Tighten the connecting bolt and nut from above using a fastening tool while preventing rotation, and attach the lower clamping member to the lower flange joint, and attach the upper clamping member to the upper flange joint. A method for attaching a flange reinforcing tool, comprising at least the step of: A method for attaching a flange reinforcing device for reinforcing a flange of a pipe constituting member and a flange of a connecting member joined thereto by sandwiching them from above and below between a pair of pinching members of a pair of upper and lower pinching members, the method comprising:
The upper and lower clamping members, which are temporarily connected by bolts and nuts from above and below so that they can move relative to each other in the vertical direction, are opened using the temporarily connected portion as a fulcrum, and the outer diameter of the upper and lower flanges is adjusted using a hanging support tool. and closing the upper and lower clamping members;
The temporarily connected bolts and nuts and the connecting bolts and nuts connecting the closed parts of the upper and lower holding members are each tightened from above using a fastening tool while preventing rotation, and the upper and lower flange joints are tightened. A method for installing a flange reinforcing tool, comprising the step of holding the upper and lower holding parts.

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