JP7446366B2 - How to install the work valve - Google Patents

Description

The present invention relates to a method for installing a work valve for performing a predetermined work inside a housing that seals a fluid pipe in a non-flow state.

The fluid pipes that make up the existing pipes through which water, gas, etc. Deteriorated pipes may be shut off. In such a case, an existing opening provided in advance may be opened, or a new opening may be formed by cutting or the like.

In operations including the process of opening an opening in this manner, a method is known in which the operations are performed in a non-flow state using a work valve. A working valve consists of a valve box attached to the opening of a housing that is fixed to the fluid pipe in a sealed manner, a valve lid attached to the valve box, and a valve that can reciprocate within the valve box and the valve lid. When the opening of the fluid pipe is open, the valve body is moved to the closed position to close the inside of the valve box, thereby preventing fluid from leaking outside the housing. On the other hand, the opening can be accessed by moving the valve body to an open position where it is retracted into the valve cover.

The working valve is generally transported to the installation location using a crane and attached to the housing. In particular, if the diameter of the fluid pipe is large, the structure of the working valve will also be large and heavy, so a large crane with high lifting capacity will be required to transport the working valve in an integrated state. Because of this necessity, a large space is required for the placement and handling of the crane.

Therefore, for example, as in the working valve mounting method shown in Patent Document 1, the working valve is divided into a valve box and a valve cover into which a valve body is inserted, and the valve box is attached to the opening of the housing. After that, there is a method of attaching the working valve to the housing by attaching the valve cover with the valve body inserted to the valve box. According to this method, the lifting capacity required for one-time transportation can be reduced.

JP 2018-159397 (Page 8, Figure 14)

In the work valve installation method of Patent Document 1, it is possible to assemble the divided work valves using a crane with low lifting capacity and attach them to the housing, so it is difficult to do work where a large space cannot be secured. A working valve can be installed even in the environment. However, when the valve cover with the valve body inserted is moved horizontally while aligning the height with the previously installed valve box, the tip of the valve body slightly protrudes outward from the valve body. must be inserted into the valve box, making it difficult to visually check the tip of the valve body, and the valve body itself is not suspended by a crane, but the valve cover with the valve body inserted is suspended directly. As a result, the valve body within the valve cover is unstable and may swing during operation, making it difficult to accurately insert and attach the tip of the valve body into the valve box. Furthermore, if the tip of the valve body comes into contact with the opening of the valve box, there is a risk that the valve body will be damaged and the sealing performance of the working valve itself will be affected.

The present invention has been made in view of these problems, and it is an object of the present invention to provide a method for attaching a working valve that reduces the difficulty of attaching the working valve to a housing.

In order to solve the above problems, the working valve mounting method of the present invention includes:
A method for installing a work valve for performing a predetermined work in an uninterrupted state in a housing that is installed in a sealed manner with respect to a fluid pipe, the method comprising:
The working valve includes a valve box attached to an opening of the housing, a valve lid attached to the valve box, and a valve body provided so as to be movable back and forth within the valve box and the valve lid. ,
a first step of installing the valve box in the opening of the housing;
a second step of inserting the valve body into the valve box;
a third step of connecting the valve body and an operating section for moving the valve body forward and backward;
The method is characterized by comprising a fourth step of attaching the valve cover to the valve box.
According to this feature, the valve body, valve body, and valve cover of the working valve are separated, and the valve body is first inserted into the valve body installed in the housing, and then the valve cover is attached to the valve body. Since the valve body is inserted into the valve box independently from the valve cover, the entire valve body can be grasped and the posture of the valve body can be controlled, allowing the valve body to be inserted into the opening of the valve body with precision. In addition, since the risk of the valve body coming into contact with the opening of the valve box can be reduced, the sealing performance of the working valve itself can be maintained without damaging the valve body. Furthermore, since the work valve is divided into the valve body, valve body, and valve cover and lifted and transported individually by crane, the weight of each part to be lifted by the crane is small, and a small crane can be used, reducing the work space. The work can be carried out even in situations where sufficient valves cannot be secured, and since the individual weights are small, handling can be improved, and the difficulty of attaching the work valve to the housing can be reduced.

The third step is characterized in that the retreat of the valve body inserted into the valve box is restricted by a restriction means.
According to this feature, the regulating means can prevent the valve body inserted into the valve box from retreating and falling when connected to the operating section for advancing and retracting the valve body.

In the second step, the valve body is suspended by a plurality of hanging branches in the traveling direction, and after the front side of the valve body is inserted into the valve box, the hanging branches are sequentially supported from the front side in the traveling direction. It is characterized by being released.
According to this feature, even if the suspension branch on the front side in the direction of movement of the valve body is released, the load on the front side of the valve body is supported near the opening of the valve body, so it remains suspended by a crane. The valve body can be further inserted into the valve body while maintaining the same substantially parallel state.

In the fourth step, the entire valve body is inserted into the opening of the valve box.
According to this feature, since the valve body is not exposed, alignment for attaching the valve cover to the valve box is easy, and it is possible to prevent the rear end of the valve body from coming into contact with the valve cover. , damage to the rear end of the valve body can be avoided.

In the fourth step, the valve lid is brought closer to the valve box by operating the operating portion connected to the valve body.
According to this feature, the valve cover can be brought closer to the valve body by operating the operating part connected to the valve body inserted into the valve body, and the valve body can be moved closer to the valve body by a crane. By doing so, the connection between the valve cover and the valve box can be facilitated.

In the second step, the valve body is inserted into the valve box after the front side of the valve body in the direction of movement is placed on a mounting portion provided to protrude into the opening of the valve box.
According to this feature, when inserting the valve body into the valve box, the valve body can be placed on the mounting part provided protruding from the opening of the valve body and aligned, so that the valve body can be inserted into the valve body. can be inserted smoothly without collision.

The operation unit includes a valve stem provided on the valve cover and for moving the valve body forward and backward,
In the third step, the tip of the valve stem is attached to the rear end of the valve body inserted into the valve box.
According to this feature, by attaching the rear end of the valve body to the tip of the valve stem, the valve body and the operating section for advancing and retracting the valve body can be connected.

The valve body has a locking portion that communicates in the vertical direction at the end on the retreating direction side,
The locking portion is characterized in that a locked portion of the valve stem is locked to the locking portion.
According to this feature, the valve stem can be attached to the valve body by moving the locked part of the valve stem in the vertical direction and locking it in the locking part of the valve body, so that the valve stem can be easily attached.

It is a side sectional view and a top view showing a process (a first process of an attachment process) of attaching a valve box of a working valve to a case in an example. It is a side sectional view showing how a valve body is attached to a valve box (the 2nd process of an attachment process). It is a side sectional view showing how a valve body is attached to a valve box (the 2nd process of an attachment process). It is a side sectional view and a top view showing how a valve body is attached to a valve box (the 2nd process of an attachment process). It is a sectional side view which shows the aspect which connects the valve stem provided in the valve lid to the valve body inserted in the valve box (3rd process of an attachment process). FIG. 7 is a side sectional view showing a mode (modification) of connecting a valve stem provided on a valve lid to a valve body inserted into a valve box (third step of the attachment step). It is a top view which shows the aspect (modification) which connects the valve stem provided in the valve lid to the valve body inserted in the valve box (3rd process of an attachment process). It is a side sectional view showing how a valve cover is attached to a valve box (the 4th process of an attachment process). It is a side sectional view showing how a valve cover is attached to a valve box (the 4th process of an attachment process). FIG. 3 is a side sectional view showing how the mounting flange tube is attached to the work valve in the process of installing the cutting machine. FIG. 3 is a side cross-sectional view showing how a cutter and a lid are attached to the mounting flange cylinder in the step of installing the cutting machine. FIG. 7 is a side cross-sectional view showing how the lid body is fixed to the mounting flange tube in the step of installing the cutting machine. It is an explanatory view showing the structure of a drive mechanism. FIG. 3 is a side sectional view showing how the shaft member and the cutter are connected in the process of installing the cutting machine. FIG. 3 is a side sectional view showing how the jack and fixing jig are removed in the process of installing the cutting machine. FIG. 6 is a side sectional view showing how the case portion of the drive mechanism and the lid body are connected in the step of installing the cutting machine. FIG. 3 is a side sectional view showing how a fluid pipe is cut by a cutting machine. FIG. 3 is a side cross-sectional view showing a state in which a section of the fluid tube is collected. FIG. 3 is a side cross-sectional view showing how the cylindrical member is attached to the working valve in the process of installing the valve introducing machine. FIG. 3 is a side cross-sectional view showing how the partition wall, opening/closing shaft, and valve body of the butterfly valve are attached to the cylindrical member in the process of installing the valve introduction device. FIG. 3 is a side cross-sectional view showing a state in which a butterfly valve is constructed by attaching an upper lid part in a step of installing a valve introducing machine. FIG. 3 is an explanatory diagram showing how the mounting flange tube is attached to the cylindrical member in the step of installing the valve introduction device. FIG. 3 is a side sectional view showing how a valve hanging fitting and a lid body are attached in the process of installing the valve introducing machine. FIG. 6 is a side cross-sectional view showing how the lid body is fixed to the mounting flange cylinder in the step of installing the valve introduction device. FIG. 6 is a side cross-sectional view showing how the shaft member and the valve hanging fitting are connected in the process of installing the valve introducing machine. FIG. 3 is a side sectional view showing how the jack and fixing jig are removed in the process of installing the valve introducing machine. FIG. 3 is a side cross-sectional view showing how the butterfly valve and the valve hanging fitting are connected in the process of installing the valve introducing machine. FIG. 3 is a side cross-sectional view showing a state in which a butterfly valve is installed at a cut point of a fluid pipe using a valve introducing machine. FIG. 3 is a side sectional view showing the valve hanging fitting pulled up into the cylindrical member and the mounting flange tube. It is a side sectional view showing a modification of a cutting machine. FIG. 3 is a side cross-sectional view showing the valve introduction device removed from the housing. FIG. 3 is a side sectional view showing how the valve cover is removed from the valve box (first step of the three-part removal step) in the first aspect of the step of removing the working valve from the housing. FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (second step of the three-part removal step). FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (second step of the three-part removal step). FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (second step of the three-part removal step). FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (second step of the three-part removal step). FIG. 7 is a side sectional view showing how the valve box is removed from the housing (third step of the three-part removal step). FIG. 3 is a side view showing the state after the working valve is removed. FIG. 7 is a side sectional view showing how the valve cover is removed from the valve box in the second embodiment of the process of removing the working valve from the housing (the first step of another three-part removal process). FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (a second step of another three-part removal step). FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (a second step of another three-part removal step). FIG. 7 is a side sectional view showing how the valve body is removed from the valve box (a second step of another three-part removal step). It is a side sectional view showing how a valve box is removed from a short pipe (the 3rd process of other 3 division removal processes). FIG. 7 is a side sectional view showing how the short tube is removed from the casing (fourth step of the other three-part removal steps). FIG. 7 is a side sectional view showing how the valve body and valve cover are removed from the valve box (first step of the two-part removal step) in the third aspect of the step of removing the working valve from the housing. FIG. 7 is a side sectional view showing how the valve box is removed from the housing (second step of the two-part removal step). FIG. 7 is a side cross-sectional view showing how the valve cover is removed from the valve box (a first step of another two-part removal step) in a fourth aspect of the step of removing the working valve from the housing. It is a side sectional view showing how a valve box and a valve body are removed from a short pipe (a second step of another two-part removal step).

EMBODIMENT OF THE INVENTION The form for carrying out the attachment method of the working valve based on this invention is demonstrated below based on an Example.

In the embodiment, a series of steps from cutting a predetermined location of an existing fluid pipe 1 constituting a flow path component to installing a butterfly valve 10 (fluid control) at the cut location, and A series of steps for removing the working valve 4 after installation (fluid) will be described with reference to FIGS. 1 to 48.

As shown in FIG. 1, a predetermined portion of a fluid pipe 1 buried underground is excavated, and a casing 2 having a two-part structure having a branch portion 2a opening upward is hermetically enclosed. Note that the fluid in the fluid pipe 1 may be, for example, tap water, industrial water, sewage, or the like, as well as gas or a gas-liquid mixture of gas and liquid. Furthermore, although the casing 2 has a two-part structure in this embodiment, it may have another multi-part structure, and the split casings may be joined by welding or bolts via packing. .

The fluid pipe 1 is a steel pipe and has a substantially circular cross-sectional shape. The fluid pipe according to the present invention may be made of ductile cast iron, other cast iron, other metals, concrete, vinyl chloride, polyethylene, polyolefin, or the like. Furthermore, the inner circumferential surface of the fluid tube may be coated with an epoxy resin layer, mortar, plating, etc., or the inner circumferential surface of the fluid tube may be coated with a suitable material by powder coating.

Furthermore, when installing the casing 2 to the fluid pipe 1 in a sealed manner, concrete foundations 9, 9 are formed below the casing 2 to support the weight around the casing 2 and prevent bending of the fluid pipe 1. To prevent. Note that the concrete foundations 9 are not limited to the concrete foundations 9, and a jack or the like may be used as long as it can support the weight of the casing 2, the cutting machine 5, and the valve introduction machine 6, which will be described later.

Next, the process of attaching the working valve 4 capable of closing the opening of the branching part 2a to the branching part 2a (opening part) of the housing 2 will be explained in order. Here, the working valve 4 of this embodiment is a valve that is mainly composed of a valve box 41, a valve body 42, and a valve cover 43, as will be described later, and is capable of opening and closing the branch portion 2a of the housing 2. First, the first step of the installation step of installing the valve box 41 in the branch portion 2a (opening) of the housing 2 will be described. As shown in FIG. 1, the valve box 41 constituting the working valve 4 is suspended from above by a wire W and a hanging tool C equipped with a hook that is suspended by a crane (not shown), and placed on the flange 2b of the branch portion 2a. , and while adjusting the position of the valve box 41 on the flange 2b, the flange 2b and the valve box 41 are fixed with bolts and nuts (not shown) (the first step of the mounting process is completed). Next, a plurality of valve body temporary holders 41b serving as mounting portions are attached to the lower side of the opening 41a of the valve box 41, spaced apart in the width direction. This valve body temporary holder 41b (mounting part) has a vertical surface and a horizontal surface, and has a substantially right triangular shape when viewed from the front. It is attached to the opening 41a of the valve box 41 so that the horizontal surface extends from the slide groove 41e provided inside the valve box 41 and is substantially flush with the surface of the slide groove 41e. It will be done. These valve body temporary holders 41b may be attached to the valve body 41 after the valve body 41 is fixed to the branch part 2a of the housing 2 as in this embodiment, or they may be attached to the valve body 41 in advance. The valve box 41 may be fixed to the branch portion 2a of the housing 2 with the temporary body holder 41b attached. The crane used in this example is preferably a mobile rough terrain crane, for example, and needless to say, its size will increase depending on its lifting capacity, and it will be able to lift the heaviest member among the members described below. Possible specifications are selected considering the permissible lifting loads at the turning radius. Furthermore, the installation area of the crane, including outriggers and the like, is often larger than the excavation area of the fluid pipe 1.

In this embodiment, even after the valve box 41 is placed on the flange 2b of the branch portion 2a, the wire W is connected to the crane with the wire W slightly loosened to ensure safety. However, the present invention is not limited to this, and the hanging tool C and wire W may be removed from the valve box 41. Further, in order to make it easier to adjust the position of the valve box 41, the valve box 41 may be slightly suspended by a crane and then adjusted relative to the flange 2b.

The valve box 41 has a substantially cylindrical shape that penetrates in the vertical direction, and has a slide groove 41e extending substantially horizontally from an opening 41a provided on one side. This slide groove 41e guides the running of a front wheel 42c and a rear wheel 42d provided below a valve body 42, which will be described later. The weight of the valve box 41 in this embodiment is approximately 4500 kg. Note that since an O-ring (not shown) is pressed between the flange 2b and the valve box 41, the branch portion 2a and the valve box 41 are connected in a sealed manner. Hereinafter, the weight of each member is merely an example, and can be changed to an appropriate weight.

Next, the second step of the installation step of inserting the valve body 42 into the valve box 41 will be explained. As shown in FIG. 2, at the four corners of the upper part of the valve body 42 constituting the working valve 4, there are front eye bolts 42a as hanging branches at two locations on the front side in the insertion direction (left side in the figure), and on the rear side in the insertion direction (right side in the figure). A rear eye bolt 42b serving as a hanging support is attached to each of the two locations, a front wheel 42c and a rear wheel 42d are attached to the lower part of the valve body 42, and a plurality of side wheels 42i are attached to the side. The front wheel 42c and the rear wheel 42d are guided along a slide groove 41e provided inside the valve box 41, and the plurality of side wheels 42i are guided by coming into contact with the inner surface inside the valve box 41. Therefore, the insertion and movement of the valve body 42 into the valve box 41 can be performed smoothly. Furthermore, the front wire W1 and the rear wire W2 are passed through the front eye bolt 42a and the rear eye bolt 42b, respectively, and the valve body 42 is hoisted up with a hanging tool C using these front wire W1 and the rear wire W2 so that it becomes horizontal. The box 41 is lowered to the side of the opening 41a, and the front wheel 42c of the valve body 42 is mounted on the valve body temporary holder 41b attached to the side of the opening 41a of the valve body 41. Here, by attaching the chain block B to the front wire W1 in advance, the length of the front wire W1 can be expanded and contracted. In FIG. 2, since the length of the front wire W1 and the length of the rear wire W2 are substantially the same, the valve body 42 can be stably suspended horizontally. First, the front wheel 42c of the valve body 42 is placed on the valve body temporary holder 41b, and then the wheel stopper 41c for the front wheel 42c of the valve body 42 is placed on the valve body temporary holder to prevent the valve body 42 from moving backward and falling. Insert it into the stand 41b.

In this way, when inserting the valve body 42 into the valve box 41, it is possible to place it on the valve body temporary holder 41b (placing section) provided protruding from the opening 41a of the valve body 41 and align it. Therefore, the valve body 42 can be smoothly inserted into the valve box 41 without colliding with the valve body 41.

Next, as shown in FIG. 3, the length of the front wire W1 is adjusted in the stretching direction using the chain block B attached to the front wire W1 until the rear wire W2 becomes substantially vertical. At this time, the valve body 42 is adjusted using a crane so that it always remains in a horizontal state. When the rear wire W2 becomes vertical and the front wire W1 is confirmed to be loose, the front wire W1 and the front eye bolt 42a are removed from the valve body 42. At this time, the load on the front side of the valve body 42 is received by the valve body temporary holder 41b, and the load on the rear side of the valve body 42 is suspended by the rear wire W2, so when the front eye bolt 42a is removed, the valve body A stable state can be maintained without the body 42 moving in the horizontal direction.

Next, as shown in FIG. 4(a), a retraction eye bolt 42e is provided at the upper part of the rear end of the valve body 42, and the valve body 41 and the valve body 42 are connected with a wire W3 and a chain block B' for retracting the valve body 42. connect. Then, when the length of the wire W3 is adjusted to be shortened by the chain block B' and pulled in in cooperation with the suspended state by the wire W2, the valve body 42 is gradually drawn into the valve body 41 in the horizontal direction. . After the rear wheel 42d of the valve body 42 enters the valve body 41 and the valve body 42 is pulled into the valve body 41 so that the rear end of the valve body 42 comes to a position approximately 200 mm from the valve body mating flange surface, A valve body removal prevention plate 41d as a regulating means for regulating the retreat of the valve body 42 is attached to the opening 41a of the valve body 41 with bolts, and the chain blocks B, B', wires W2, W3, rear eye bolt 42b, and retracting Remove eye bolt 42e. As shown in FIG. 4(b), the valve body removal prevention plate 41d (regulating means) is a vertically long plate-like member attached to the end face of the opening 41a of the valve body 41, and is used to prevent valves inserted into the valve body 41. Parts (two locations) of the opening 41a of the valve box 41 are closed to prevent the body 42 from slipping out. Then, the rear end of the valve body 42 is completely pushed into the valve body 41 using a crowbar or the like (not shown), and the valve body temporary holder 41b is removed from the opening 41a of the valve body 41 (second step of the installation process). end).

In this way, even if the eye bolt 42a (hanging branch) on the front side of the valve body 42 in the direction of movement is released, the load on the front side of the valve body 42 is supported near the opening 41a of the valve body 41. The valve body 42 can be further inserted into the valve body 41 while maintaining the substantially parallel state similar to the suspended state.

Next, a third step of the attachment process of connecting the valve body 42 and a valve stem serving as an operating section for advancing and retracting the valve body will be described. As shown in FIG. 5, the wire W and chain block B are used to lift the valve lid 43 horizontally. A long feed screw 43a (valve stem) is installed horizontally inside the valve cover 43. The feed screw 43a is rotatably supported within the valve cover 43 and cannot move forward or backward in the axial direction. It can be screwed into a feed nut 42f provided at the rear end of the inserted valve body 42. The valve body 42 is suspended at a position where the tip of the feed screw 43a is aligned with the feed nut 42f provided at the rear end of the valve body 42, and the electric screwdriver 43b attached to the rear end of the valve cover 43 is used to , rotate the feed screw 43a inside the valve lid 43 at a very low speed, screw the tip of the feed screw 43a into the feed nut 42f inside the valve body 42, and connect the valve body 42 and the feed screw 43a (the first step in the installation process). 3 steps completed). Note that the feed screw 43a is not necessarily turned using the electric screwdriver 43b, but may be turned manually using a handle or the like (not shown).

In this way, by attaching the rear end of the valve body 42 to the tip of the feed screw 43a (valve stem), the valve body 42 and an operating section for moving the valve body 42 forward and backward can be connected.

Further, as the feed nut 42f is screwed in from the tip of the feed screw 43a gradually toward the proximal end (right side in the drawing), the tip opening of the valve lid 43 gradually approaches the opening 41a of the valve box 41. A crane is operated in accordance with the speed of the feed screw, and the valve cover 43 is moved at a slow speed toward the valve box 41 by operating the crane.

At this time, the valve body 42 inserted into the valve body 41 is prevented from retreating and falling when connected with the feed screw 43a (operating part) for moving the valve body 42 forward and backward. This can be prevented by the plate 41d (regulating means).

6 and 7 show a modification in which the valve body 42 and the feed screw 43a are connected. Similarly to FIG. 5, lift the valve lid 43 horizontally using a new wire W and chain block B. A long feed screw 43a (valve rod) is built into the valve cover 43, and a feed nut 42f' serving as a locked portion is screwed into the tip of the feed screw 43a in advance. On the other hand, as shown in FIG. 7, the valve body 42 has a substantially rectangular shape with a rear end protruding in plan view, and a feed nut 42f' is attached to the rear end of the valve body 42 to rotate from above. A storage portion 42g serving as a locking portion is provided with an open upper portion so that the housing portion 42g can be accommodated therein. Further, at the rear of the storage portion 42g, a pair of nut removal prevention plates 42h are provided at a distance from each other so that the upper part is open so that the feed nut 42f' does not fall out. The interval has a width slightly larger than the diameter of the feed screw 43a and smaller than the width of the feed nut 42f'. As shown in FIG. 7, by inserting the feed screw 43a with the feed nut 42f' screwed onto the tip into the storage part 42g of the valve body 42, the front, rear and side surfaces of the feed nut 42f' are inside the storage part 42g. The feed nut 42f' is housed in a non-rotatable manner by contacting the wall surface and the inner surface of the nut removal prevention plate 42h, and the feed screw 43a continuous to the feed nut 42f' is sandwiched between the nut removal prevention plates 42h, and the feed nut 42f 'Movement will be regulated. In this way, by suspending the valve cover 43 from vertically above using a crane, the feed nut 42f' that is threaded onto the tip of the feed screw 43a is fitted into the housing portion 42g from above, and the valve body 42 and and the feed screw 43a (end of the third step of the attachment step in the modification). Using the electric screwdriver 43b, the feed screw 43a inside the valve cover 43 is rotated at a slow speed, a crane is operated in accordance with the speed of the feed screw, and the valve cover 43 is moved toward the valve box 41 at a slow speed by operating the crane. to move it.

In this way, by moving the feed nut 42f' (locked part) screwed onto the feed screw 43a (valve stem) in the vertical direction and locking it in the storage part 42g (locking part) of the valve body 42. Since the feed screw 43a (valve stem) can be attached to the valve body 42, attachment is easy.

Next, the fourth step of attaching the valve cover 43 to the valve box 41 will be explained. As shown in FIG. 8, the electric screwdriver 43b is used to rotate the feed screw 43a at a very low speed, and the valve cover 43 is pulled toward the valve box 41 by operating a crane, so that the side end of the valve box 41 and the valve cover When the gap between the mating flanges at the side ends of the valve member 43 becomes small (for example, about 100 mm), the valve element removal prevention plate 41d is removed.

Next, as shown in FIG. 9, the valve cover 43 is pulled by rotating the feed screw 43a with the electric screwdriver 43b until the mating flanges of the side ends of the valve box 41 and the side ends of the valve cover 43 are joined, and the valve cover 43 is pulled together. 41 and the side end of the valve cover 43 are joined together, and then fixed with bolts and nuts 44 (the fourth step of the installation process is completed).

In this way, in the fourth step of the installation process, the valve body 42 inserted into the valve box 41 is operated with the feed screw 43a (operating part) provided on the valve lid 43, thereby attaching the valve lid 43 to the valve body 42. The valve cover 43 can be brought close to the box 41, and the connection between the valve cover 43 and the valve box 41 can be facilitated by cooperating with a suspension support provided by a crane.

At this time, by performing the fourth step of the installation process with the entire valve body 42 inserted into the opening 41a of the valve body 41, the valve body 42 is not exposed, so that the valve body 41 is not exposed. Positioning for attaching the valve cover 43 is easy, the rear end of the valve body 42 and the valve cover 43 can be prevented from coming into contact, and damage to the rear end of the valve body 42 can be avoided. can. Once the connection and fixation are confirmed, the wire W holding the valve cover 43 and the chain block B are removed. Finally, using the electric screwdriver 43b, rotate the feed screw 43a inside the valve lid 43 to completely pull the valve body 42 inside the valve box 41 toward the valve lid 43, that is, move the valve body 42 back to the "open" position. let

In this way, the working valve 4 has a first divided body made up of the valve box 41, a second divided body made up of the valve body 42, and a third divided body made up of the valve cover 43. , and the working valve 4 is constructed by assembling these parts in order to the branch part 2a of the housing 2. In other words, since the first divided body, the second divided body, and the third divided body can be transported separately using the hanging tool C and the wire W, the first divided body, the second divided body, and the third divided body can be transported separately. In addition to being able to transport the crane with a well-balanced weight, the load on the crane can be dispersed compared to when the work valve 4 is installed at the branch part 2a in an assembled state (work valve 4 with a total weight of 10,500 kg). Since the load can be reduced, the crane can be downsized, and the work space in which the work valve 4 is installed can be saved. Moreover, since the load on the hanging tool C and the wire W is also reduced, there is no need to prepare a thick hanging tool C and wire W, and the cost of the hanging tool C and wire W to be used can also be suppressed.

Furthermore, as will be described later, when a hole saw such as the cutter 52 of this embodiment is used as a means for cutting the fluid pipe 1, the diameter of the hole saw is larger than the outer diameter of the fluid pipe 1. Although the structure of the valve 4 also becomes larger, even in such a case, the first divided body, the second divided body, and the third divided body can be transported separately using the hanging tool C and the wire W, so a crane can be used suitably. Can be made smaller.

Further, the working valve 4 is divided into a valve box 41 installed above the branch part 2a, and a valve body 42 and a valve cover 43 that bulge out laterally from the valve box 41. After fixing the box 41 to the branch part 2a, the valve body 42 is inserted into the valve box 41, and then the valve cover 43 is fixed to the valve box 41. Therefore, when installing the valve box 41 in the branch part 2a, the weight balance is This prevents the suspended load from tilting, making it easy to install the valve box 41 at the branch portion 2a. Furthermore, when connecting the valve cover 43 to the valve box 41, the suspended load does not tilt due to the weight balance, and the connection of the valve cover 43 to the valve box 41 becomes simple.

When connecting the valve cover 43 to the valve box 41, after inserting the valve body 42 into the opening 41a of the valve case 41, the feed screw 43a of the valve cover 43 is connected to the feed nut 42f of the valve body 42 inside the valve box 41. Since the valve lid 43 can be guided from the side and moved until it comes into contact with the valve box 41, the valve lid 43 can be accurately advanced and placed relative to the valve box 41.

In this embodiment, the valve cover 43 and the valve box 41 are fixed by bolts and nuts, but the present invention is not limited to this, and the valve cover 43 and the valve box 41 may be fixed by another fixing means such as a vice. , may be fixed by welding or the like.

As described above, according to the method for installing the working valve 4 of the present invention, the valve box 41, the valve body 42, and the valve cover 43 of the working valve 4 are each divided, and the valve box 41 installed in the housing 2 is first installed. Since the valve body 42 is inserted into the valve body 42 and the valve cover 43 is then attached to the valve box 41, the valve body 42 is inserted into the valve body 41 independently from the valve cover 43, so it is easy to grasp the entire valve body 42. By being able to control the posture of the valve body 42, the valve body 42 can be inserted into the opening 41a of the valve box 41 with high accuracy, and there is no risk of the valve body 42 coming into contact with the opening 41a of the valve body 41. can be reduced, so the sealing performance of the working valve 4 itself can be maintained without damaging the valve body 42. Furthermore, since the working valve 4 is divided into the valve box 41, valve body 42, and valve cover 43 and lifted and transported individually by a crane, the weight of each part to be lifted by the crane is small, and a small crane can be used. Therefore, work can be carried out even in situations where there is insufficient work space, and since the individual weights are small, handling can be improved, and the difficulty of attaching the work valve 4 to the housing 2 can be reduced. can.

Next, a process of installing the cutting machine 5 for cutting the fluid pipe 1 above the working valve 4 will be explained. As shown in FIG. 10, first, the mounting flange cylinder 51 (cylindrical body) penetrating in the vertical direction is suspended by a hanging tool C and a wire W and lowered to above the valve box 41. The mounting flange cylinder 51 is fixed to the mounting flange cylinder 51 with bolts and nuts (not shown). The weight of the mounting flange tube 51 in this embodiment is approximately 2600 kg. Further, since an O-ring (not shown) is pressed between the mounting flange cylinder 51 and the valve box 41, the valve box 41 and the mounting flange cylinder 51 are connected in a sealed manner.

Next, as shown in FIG. 11, the cutter 52 is temporarily installed on the mounting flange cylinder 51. Specifically, with the lid 53 of the mounting flange cylinder 51 connected above the cutter 52, the cutter 52 is suspended by a hanger C and a wire W and lowered to above the mounting flange cylinder 51. The cutter 52 consists of a cylindrical member 52a equipped with a cutting blade at the peripheral end, and a center drill 52b that is disposed coaxially with the cylindrical member 52a and protrudes further than the drilling blade. is fixed. Further, above the cylindrical member 52a and the center drill 52b, an adapter 54 having an annular protrusion 54a formed at its upper end is attached so as not to rotate relative to each other.

Further, the lid body 53 has a through hole 53a formed in the center thereof that penetrates in the vertical direction, and an adapter 54 is inserted into the through hole 53a. In addition, the lid body 53 has a plurality of recesses 53b formed in the circumferential direction, which are recessed from the inner peripheral surface of the through hole 53a in the outer radial direction, and the recesses 53b are movable in the radial direction of the through hole 53a. A fixing jig 55 is provided. The cutter 52 and the lid body 53 are integrated by the fixing jig 55 protruding in the inner diameter direction of the through hole 53a and engaging with the lower surface of the annular protrusion 54a of the adapter 54.

In this example, the weight of the cutter 52 is approximately 2910 kg, the weight of the lid 53 is approximately 1900 kg, the weight of the adapter 54 is approximately 290 kg, and the total weight of these is approximately It weighs 5,100 kg.

As shown in FIG. 12, with the lid 53 placed above the mounting flange cylinder 51, the mounting flange cylinder 51 and the lid 53 are aligned and fixed with bolts and nuts (not shown). At this time, the cutter 52 is housed inside the mounting flange cylinder 51.

Furthermore, as shown in the enlarged part of FIG. 12, since the packing S2 is pressure-contacted in the circumferential direction between the mounting flange cylinder 51 and the lid body 53, the connection between the mounting flange cylinder 51 and the lid body 53 is It is possible to ensure a tight seal between the parts. In this embodiment, the packing S2 is press-fitted into a groove provided on the lid body 53 side, but the present invention is not limited to this. A packing S2 may be press-fitted into the hole.

Next, the drive mechanism 8 (drive section) of the cutting machine 5 is connected to the cutter 52. First, the structure of the drive mechanism 8 will be explained based on FIG. 13.

As shown in FIG. 13, the drive mechanism 8 includes a shaft member 81, a gripping member 82 capable of gripping or releasing the gripping of the shaft member 81, and moving the gripping member 82 forward and backward within an axial range of the shaft member 81. It is mainly composed of an advancing/retracting member 83, a regulating member 84 that can restrict or release the movement of the shaft member 81 at a position below the advancing/retracting member 83, and a base member 85 to which the advancing/retracting member 83 and the regulating member 84 are attached. ing. The weight of the drive mechanism 8 in this example is approximately 6060 kg.

Further, a rotary motor 87 is fixedly attached to a part of the advancing/retracting member 83, and the rotary motor 87 applies a rotational force to the gripping member 82 which is gripping the shaft member 81. Rotation can be transmitted, and the cutter 52 can be rotated by rotating the shaft member 81. In addition, by preparing a plurality of shaft members 81, the length in the axial direction can be increased by adding them in the axial direction, and because of this adding structure, the weight and height can be reduced. .

As shown in FIG. 14, when connecting the drive mechanism 8 to the cutter 52, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the upper flange 53c of the lid body 53, and the shaft member 81 is placed in a predetermined position. The shaft member 81 is advanced downward in length so that the lower end of the shaft member 81 protrudes below the case part 86, the drive mechanism 8 is suspended by the hanging tool C and the wire W, and the case part 86 is placed on the jack 7. do. Next, an operator accesses through the gap between the case portion 86 formed by the jack 7 and the upper flange 53c of the lid body 53, and connects the shaft member 81 and the adapter 54 with the bolt nut N1.

Next, as shown in FIG. 15, the drive mechanism 8, adapter 54, and cutter 52 are lifted slightly upward by a crane, the jack 7 is removed from between the case part 86 and the lid body 53, and the fixing jig 55 is removed. It is evacuated into the recess 53b. At this time, the cutter 52 (approximately 2910 kg), the adapter 54 (approximately 290 kg), and the drive mechanism 8 (approximately 6060 kg) are lifted by the crane, so the weight applied to the crane is approximately 9260 kg. At this time, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the lower flange 53d of the lid body 53, and the drive mechanism 8 is placed on the jacks 7 to receive the weight, and the drive mechanism 8 is placed on the crane. Weight may be reduced.

Subsequently, as shown in FIG. 16, the drive mechanism 8 is lowered by a crane so that the case part 86 is placed on the upper flange 53c of the lid body 53, and the case part 86 and the lid body 53 are removed using bolts and nuts (not shown). and fix it. As a result, the mounting flange tube 51, the cutter 52, the lid 53, the adapter 54, and the drive mechanism 8 constitute the cutting machine 5, and the casing 2, the work valve 4, and the cutting machine 5 constitute the cutting device. At this time, it goes without saying that the center drill 52b is adjusted so as not to come into contact with the valve body 42.

Next, the process of cutting the fluid pipe 1 with the cutting machine 5 will be explained. As shown in FIG. 17, first, the valve body 42 of the working valve 4 is retracted to open the branch portion 2a, and the aforementioned gripping member 82 grips the outer peripheral surface of the rear end side of the shaft member 81. Next, the rotary motor 87 is driven to rotate the shaft member 81 and the cutter 52. Then, the reciprocating member 83 is advanced toward the fluid pipe 1 with the shaft member 81 and the cutter 52 being rotated. According to this, first, the center drill 52b of the cutter 52 drills the pipe wall of the fluid pipe 1.

As shown in FIG. 18, when the fluid pipe 1 is cut by the cutter 52, a piece 1a formed by cutting the fluid pipe 1 is held in the cylindrical member 52a. Then, by retracting the shaft member 81 and cutter 52 in the reverse order of the above steps, they are pulled up together with the piece 1a into the mounting flange cylinder 51, and the branch part 2a is closed by the valve body 42 of the work valve 4. , the cutting operation of the fluid pipe 1 is completed.

Next, a process of installing the valve introduction device 6 for installing the butterfly valve 10 at the location where the fluid pipe 1 is cut will be explained. As shown in FIG. 19, first, the cylindrical member 61 (cylindrical body) penetrating in the vertical direction is suspended by the hanging tool C and the wire W while the branch part 2a is closed by the valve body 42 of the working valve 4. The cylindrical member 61 is fixed above the working valve 4 with bolts and nuts (not shown) or the like. The weight of the cylindrical member 61 in this example is approximately 3000 kg. Further, since an O-ring (not shown) is pressed between the cylindrical member 61 and the working valve 4 (valve box 41), the cylindrical member 61 and the working valve 4 are connected in a sealed manner.

Next, a process of temporarily installing the butterfly valve 10 on the cylindrical member 61 will be explained. First, the structure of the butterfly valve 10 will be explained based on FIG. 21.

As shown in FIG. 21, the butterfly valve 10 controls the flow path of the fluid pipe 1 into a state in which fluid can pass and a state in which fluid cannot pass, and includes a partition wall 11 having an opening approximately in the center, and a partition wall 11 having an opening approximately in the center. An opening/closing shaft 12 rotatably attached to the upper end of the wall 11, a valve body 13 provided so as to be able to rotate around the opening/closing shaft 12 to open and close the opening of the partition wall 11, and the upper end of the partition wall 11. A substantially circular upper cover portion 14 (lid body portion) extending in a substantially horizontal direction is connected in a sealing manner to the upper cover portion 14 . A packing S5 is fixed to the partition wall 11 over both sides and the bottom thereof, and a packing S6 is fixed to the upper lid part 14 over the entire circumference of its outer circumferential surface, and the packings S5 and S6 are continuous. connected like this. Incidentally, the total weight of the butterfly valve 10 in this embodiment is approximately 9540 kg. Furthermore, it goes without saying that the space between the partition wall 11 and the upper lid part 14 is sealed with a packing or the like.

As shown in FIG. 20, when temporarily installing the butterfly valve 10 on the cylindrical member 61, first, the hanging tool C and It is suspended by a wire W and lowered to a position where it is accommodated in the cylindrical member 61. At this time, the valve body 13 is arranged so as to be substantially parallel to the tube axis direction (with the opening of the partition wall 11 open).

Then, the locking member 62 (locking portion, holding portion) is inserted from the outside through a plurality of windows 61 a formed in the circumferential direction of the cylindrical member 61 so as to partially protrude into the cylindrical member 61 . As a result, the protruding piece 11a that protrudes outward from the partition wall 11 is placed (locked) on the tip of the locking member 62, and the partition wall 11, opening/closing shaft 12, and valve body 13 are connected to the cylindrical member 61. It will be held at Note that since a recess 62a that can accommodate a portion of the valve body 13 is formed in the lower part of the distal end of the locking member 62, the locking member 62 and the valve body 13 do not interfere with each other.

Next, as shown in FIG. 21, the upper lid part 14 is suspended by a hanging tool C and a wire W and placed on the upper part of the partition wall 11 with the opening/closing shaft 12 inserted therethrough. Then, the butterfly valve 10 is constructed by sealingly connecting the upper lid part 14 and the partition wall 11 by a fixing means (not shown).

Next, as shown in FIG. 22, the mounting flange tube 63 penetrating in the vertical direction is suspended by the hanging tool C and the wire W and lowered to above the cylindrical member 61. 63 is fixed with bolts and nuts (not shown). The weight of the mounting flange tube 63 in this embodiment is approximately 2600 kg.

Further, as shown in the enlarged view of FIG. 22, an annular groove 63a is formed in the lower surface of the mounting flange cylinder 63, and an annular packing S7 is press-fitted into the annular groove 63a. When the cylindrical member 61 and the mounting flange pipe 63 are fixed, the packing S7 is pressed between the cylindrical member 61 and the mounting flange pipe 63, so that the sealing between the cylindrical member 61 and the mounting flange pipe 63 is ensured. can. In this embodiment, the packing S7 is press-fitted into the annular groove 63a formed on the lower surface of the mounting flange cylinder 63, but the present invention is not limited to this. A packing S7 may be press-fitted into the annular groove.

Next, as shown in FIG. 23, a valve hanging fitting 64 to be connected to the butterfly valve 10 is temporarily installed on the mounting flange cylinder 63. Specifically, with the lid 65 of the mounting flange cylinder 63 connected above the valve hanging fitting 64, it is suspended by the hanging tool C and the wire W and lowered to above the mounting flange cylinder 63. The valve hanging fitting 64 includes a mounting surface portion 64a facing in a substantially horizontal direction, a cylindrical shaft portion 64c extending upward from a through hole 64b provided approximately in the center of the mounting surface portion 64a, and a cylindrical shaft portion 64c between the mounting surface portion 64a and the shaft portion 64c. A reinforcing rib 64d is provided over the area. Further, an adapter 66 is connected to the upper end of the shaft portion 64c.

Further, the lid body 65 has a through hole 65a formed in the center thereof that penetrates in the vertical direction, and an adapter 66 is inserted into the through hole 65a. In addition, the lid body 65 has a plurality of recesses 65b formed in the circumferential direction, which are recessed in the outer circumferential direction from the inner circumferential surface of the through hole 65a, and the recesses 65b are movable in the radial direction of the through hole 65a. A fixing jig 67 is provided. The fixing jig 67 protrudes in the inner diameter direction of the through hole 65a and engages with the lower surface of the annular protrusion 66a of the adapter 66, so that the valve hanging fitting 64 and the lid body 65 are integrated.

As shown in FIG. 24, with the lid 65 placed on the upper end of the mounting flange cylinder 63, the mounting flange cylinder 63 and the lid 65 are aligned and fixed with bolts and nuts (not shown). In this embodiment, even after the lid 65 is placed on the mounting flange cylinder 63, the wire W is connected to the crane with the wire W slightly loosened to ensure safety. The present invention is not limited to this, and the hanging tool C and wire W may be removed from the lid 65. Furthermore, in order to facilitate position adjustment of the lid 65, the positions of the mounting flange tube 63 and the lid 65 may be adjusted with the lid 65 slightly suspended by a crane.

As shown in the enlarged part of FIG. 24, since the packing S8 is pressure-contacted in the circumferential direction between the mounting flange cylinder 63 and the lid 65, the gap between the mounting flange cylinder 63 and the lid 65 is Sealing performance can be ensured. In this embodiment, the packing S8 is press-fitted into a groove provided on the lid body 65 side, but the present invention is not limited to this. A packing S8 may be press-fitted therein.

Next, the drive mechanism 8 as an insertion machine of the valve introducing machine 6 is connected to the valve hanging fitting 64. Note that since the drive mechanism 8 is the same as that used during the cutting operation of the fluid pipe 1, a description of the structure of the drive mechanism 8 will be omitted.

As shown in FIG. 25, when connecting the drive mechanism 8 to the valve hanging fitting 64, the shaft member 81 is advanced downward by a predetermined length in advance so that the lower end of the shaft member 81 is lower than the case portion 86. A plurality of jacks 7 (spacers) are arranged in the circumferential direction of the upper flange 65c of the lid 65, the drive mechanism 8 is suspended by a crane, and the case part 86 is placed on the jacks 7. Next, an operator accesses through the gap between the case portion 86 formed by the jack 7 and the upper flange 65c of the lid body 65, and connects the shaft member 81 and the adapter 66 with bolts and nuts N2.

Next, as shown in FIG. 26, the drive mechanism 8, adapter 66, and valve hanging fitting 64 are lifted slightly upward by a crane, the jack 7 is removed from between the case part 86 and the lid body 65, and the fixing jig is removed. 67 is retracted into the recess 65b. At this time, the valve hanging fitting 64 (approximately 2000 kg), the adapter 66 (approximately 270 kg), and the drive mechanism 8 (approximately 6060 kg) are lifted by the hanging tool C and the wire W, so the weight applied to the hanging tool C and the wire W is approximately 8330 kg. It becomes. At this time, a plurality of jacks 7 (spacers) are arranged in the circumferential direction of the lower flange 65d of the lid body 65, and the drive mechanism 8 is placed on the jacks 7 to receive the weight, and the drive mechanism 8 is placed on the crane. Weight may be reduced.

Next, as shown in FIG. 27, the valve hanging fitting 64 is lowered by the drive mechanism 8, and the mounting surface portion 64a of the valve hanging fitting 64 and the upper lid portion 14 of the butterfly valve 10 are connected with bolts and nuts (not shown). As a result, the cylindrical member 61, the mounting flange cylinder 63, the valve hanging fitting 64, the lid body 65, the adapter 66, and the drive mechanism 8 constitute the valve introduction device 6, and the casing 2, the working valve 4, and the valve introduction device 6 constitute the valve introduction device 6. The installation equipment is configured. At this time, the opening/closing shaft 12 of the butterfly valve 10 is inserted into the shaft portion 64c of the valve hanging fitting 64.

Thereafter, the valve hanging fitting 64 and the butterfly valve 10 are lifted slightly upward by the drive mechanism 8, and the locking member 62 is retracted and pulled out from the window 61a of the cylindrical member 61. Although not shown in the drawings, the window portion 61a is plugged to seal the window portion 61a. At this time, it goes without saying that the lower end of the butterfly valve 10 is adjusted so as not to come into contact with the valve body 42.

Next, a process of installing the butterfly valve 10 at a location where the fluid pipe 1 is cut by the valve introduction device 6 will be described. As shown in FIG. 28, the valve body 42 of the working valve 4 is retracted to open the branch portion 2a, and the aforementioned gripping member 82 grips the outer peripheral surface of the rear end side of the shaft member 81. Then, the shaft member 81 and the butterfly valve 10 are moved toward the fluid tube 1 by sliding the advancing/retracting member 83 toward the fluid tube 1 .

The forward movement of the shaft member 81 and the butterfly valve 10 is performed in the range from the position where the grip member 82 grips the shaft member 81 to the position close to the regulating member 84, and after the progress movement is completed, the shaft member 81 and the butterfly valve 10 are , movement is restricted by the restriction member 84. Thereafter, another shaft member 81', 81' is connected to the upper end of the shaft member 81, and the above steps are repeated to arrange the butterfly valve 10 at the cut point of the fluid pipe 1. After the butterfly valve 10 is placed at the cut point of the fluid pipe 1, the butterfly valve 10 is fixed to the housing 2 by a predetermined restraining means 15, as shown in FIG. At this time, it is not necessarily necessary to connect another shaft member 81', and the arrangement may be completed using a shaft member 81 of a predetermined length in advance.

More specifically, the restraining means 15 mainly includes a penetration part that penetrates the peripheral wall of the casing 2 and has a female thread, and a bolt-like member that is inserted into the penetration part and screwed into the female thread. A plurality of penetrating portions and bolt-like members are equally distributed in the circumferential direction. Thereby, by rotating the bolt-like member in a predetermined direction, the bolt-like member is advanced toward the inner diameter side of the housing 2 and is disposed above the corner of the upper lid portion 14 of the butterfly valve 10. Thereby, the tip of the bolt-like member comes into contact with the upper surface of the corner of the upper lid part 14, thereby preventing the butterfly valve 10 from coming off. In addition, in the suppressing means, the advancing means screwed into the female screw of the penetration part and the contact means contacting the fluid valve may be separate bodies, and the number and arrangement thereof may be changed as appropriate. .

Note that when the butterfly valve 10 is fixed to the casing 2, the packing S5 of the partition wall 11 is pressed against both inner surfaces and the inner bottom surface of the casing 2, and the packing S6 of the upper lid part 14 is pressed against the inner bottom surface of the casing 2. Since the inner peripheral surface of the branch part 2a is in pressure contact, the fluid flowing through the fluid pipe 1 is prevented from going around between the partition wall 11 and the casing 2, and the fluid is prevented from leaking from the branch part 2a. Prevented.

Next, as shown in FIG. 29, the fluid in the cylindrical member 61 and the mounting flange cylinder 63 is discharged to the outside, and the fluid is accessed from the working hole 61b of the cylindrical member 61 to connect the mounting surface 64a of the valve hanging fitting 64 and the butterfly. The connection between the valve 10 and the upper lid part 14 by bolts and nuts is released. Then, the butterfly valve 10 is installed at the cut point of the fluid pipe 1 by retracting the shaft member 81 in the reverse order of the above steps and pulling up the valve hanging fitting 64 into the cylindrical member 61 and the mounting flange pipe 63. The work is completed.

Further, in the embodiment, the cutter 52 is a hole saw made up of a cylindrical member 52a and a center drill 52b, but the cutter 52 is not limited to this and can be freely modified. For example, as shown in FIG. 30, a cutting machine 500 in a modified example includes a cutter mechanism 501 that is externally fitted at a predetermined location of the fluid pipe 1 within the housing 20, and a work case 502 that is attached above the work valve 402. and a drive mechanism 800 that drives the cutter mechanism 501 and can be pulled up into the work case 502.

The cutter mechanism 501 includes two sprockets 501a, 501a that are rotatably provided in the outer circumferential direction of the fluid pipe 1, and a drive transmission section 501b that transmits driving force to the sprockets 501a, 501a. A cutting tool (not shown) for cutting the fluid pipe 1 is attached. Further, the drive mechanism 800 includes a rod 801 connected to the drive transmission section 501b, a motor 802 that rotationally drives the rod 801, and a pulling mechanism 803 that can pull up the rod 801.

By driving the motor 802, the sprockets 501a, 501a rotate via the rod 801 and the drive transmission section 501b, and the fluid pipe 1 can be cut. Further, the cutter mechanism 501 can be pulled up into the work case 502 by the pulling mechanism 803 while the sprockets 501a, 501a hold the section of the fluid pipe 1.

Next, the process of removing the working valve 4 will be explained below. As shown in FIG. 31, when the fluid in the cylindrical member 61 and the mounting flange cylinder 63 is discharged to the outside and it is confirmed that the branch part 2a of the housing 2 is water-stopped by the butterfly valve 10, the valve The introducer 6 is removed from the work valve 4, and the work valve 4 is removed from the branch portion 2a (see FIG. 32 onwards).

When removing the valve introduction device 6, the procedure for configuring the valve introduction device 6 is almost reversed. Briefly, from the state shown in FIG. 29, the drive mechanism 8, the adapter 66, and the valve hanging fitting 64 are slightly lifted upward by the lifting tool C and the wire W, and the upper flange 65c of the lid body 65 is lifted in the circumferential direction. The case portion 86 is placed on a plurality of jacks 7 placed in the (see FIG. 25). Next, the fixing jig 67 is locked to the adapter 66 (see FIG. 23), and the drive mechanism 8, which has been released from the adapter 66 by the bolts and nuts N2, is attached to the hanging tool C and the drive mechanism 8 through the gap between the case part 86 and the upper flange 65c. Lift up and remove using wire W (see Figure 24). Furthermore, the connection between the mounting flange tube 63 and the lid 65 using bolts and nuts etc. is released, and the valve hanging fitting 64, the lid 65, and the adapter 66 are lifted up and removed using the hanging tool C and the wire W (see FIG. 23). Then, after lifting and removing the mounting flange tube 63 that has been released from the cylindrical member 61 using bolts and nuts, etc., using the lifting tool C and the wire W, the cylindrical member 61 that has been released from the work valve 4 using the bolts and nuts is lifted. Lift up and remove using tool C and wire W (see Figure 19).

[3-part removal process]
Next, a process for removing the working valve 4 from the branch portion 2a of the housing 2 will be described. First, the three-part removal process will be explained. The three-part removal process includes a first step of removing the valve cover 43 from the valve box 41 housing at least a portion of the valve body 42, a second step of extracting and removing the valve body 42 from the valve box 41, and a second step of removing the valve body 42 from the branch part 2a. It consists of a third step of removing the valve box 41.

First, the first step of the three-part removal step will be explained. As shown in FIG. 32, the valve body 42 is advanced into the valve box 41 by rotating the feed screw 43a with an electric screwdriver 43b, and the front end of the valve body 42 and the valve body are inserted through the upper opening of the valve box 41. 41 are connected by wire W4 and chain block B1, which are restricting means in the insertion direction. At this time, the length of the wire W4 is adjusted by the chain block B1 so that the valve body 42 can be prevented from coming into contact with the opening/closing shaft 12 of the butterfly valve 10 located inside the valve box 41. Thereby, damage caused by the valve body 42 coming into contact with the opening/closing shaft 12 and leakage from the branch portion 2a of the housing 2 can be prevented. Note that the restricting means in the insertion direction is not limited to the wire W4 and the chain block B1, but may be a rod-shaped or string-shaped one that is adjusted to a predetermined length and has a locking part that can be locked to the housing 2 or the valve body 42. It may be a member or may be changed as appropriate.

When the valve body 42 is advanced to the vicinity of the opening/closing shaft 12, the hanging tool C, wire W, and chain block B are attached to the valve lid 43, and the valve lid 43, which has been released from the valve body 41, is moved in the same manner as before the connection was released. Adjust the length of the wire W with the chain block B so that it can be hung horizontally, and release the fastening of the mating flange between the side end of the valve box 41 and the side end of the valve cover 43 using the bolts and nuts 44 (see Fig. 9). do.

Next, the valve body 42 is held in position by rotating the feed screw 43a with the electric screwdriver 43b while pulling the valve cover 43 in a direction away from the valve box 41 by operating a crane. When the rear end of the valve body 42 is exposed to the outside of the valve cover 43, an eye bolt 42j is provided at the rear end, and the valve box 41 and the valve body 42 are connected by a wire W5 and a chain block B2, which are restricting means in the detachment direction. Then, in a position where a part of the valve body 42 is stored in the valve body 41 and the rest is exposed to the outside of the valve body 41, the valve body 42 may be tilted, or the valve body 42 may be unintentionally removed from the valve body 41. The length of the wire W5 is adjusted by the chain block B2 so that it can be prevented from coming off. This allows work to be done easily and safely. Note that the regulating means in the detachment direction is not limited to the wire W5 and the chain block B2, but may be a rod-shaped or string-shaped one that is adjusted to a predetermined length and has a locking part that can be locked to the housing 2 or the valve body 42. It may be a member or may be changed as appropriate.

Furthermore, while pulling the valve lid 43 in a direction away from the valve box 41 by operating a crane, rotate the feed screw 43a using an electric screwdriver 43b, and insert the tip of the feed screw 43a from the feed nut 42f inside the valve body 42. make them leave. Then, as shown in FIG. 33, the valve cover 43 is removed (the first step of the three-part removal step is completed).

Next, the second step of the three-part removal step will be explained. As shown in FIG. 33, a plurality of valve body temporary holders 41b are attached to the opening 41a of the valve body 41, and wheel chocks 41c are inserted into the valve body temporary holders 41b.

As shown in FIG. 34, the rear wire W2 is passed through the rear eye bolts 42b provided at two locations on the rear side (right side in the figure) of the upper part of the valve body 42 in the insertion direction. Lift it up with the lifting tool C so that the wires W4 and W5 and chain blocks B1 and B2 are removed.

Thereafter, the crane is operated to move the valve body 42 substantially horizontally in a direction to separate it from the valve box 41, that is, in an extraction direction. At this time, the front wheel 42c of the valve body 42 is guided along the slide groove 41e provided in the valve box 41, and the plurality of side wheels 42i are guided by coming into contact with the inner surface inside the valve box 41. Therefore, the valve body 42 can be pulled out from the valve box 41 and moved smoothly.

As shown in FIG. 35, the valve body 42 is moved approximately horizontally in the extraction direction to a position where the front eye bolt 42a can be attached. At this time, the valve body 42 is in a state where the front wheel 42c has moved outside the valve body 41 and onto the plurality of valve body temporary holders 41b, so the valve body 42 is in a state inserted into the valve body 41. is held at the same height. This prevents sudden loads from acting on the crane. Further, by moving the valve body 42 until its movement is restricted by the wheel stopper 41c, not only is it prevented from coming off, but the valve body 42 can be placed at a position where the front eye bolt 42a can be attached. That is, it is possible to easily align the front eye bolt 42a to a position where it can be attached.

Then, front eye bolts 42a are provided at two locations on the front side in the insertion direction (on the left side in the figure) above the valve body 42, the front wire W1 is passed through the front eye bolts 42a, the length of the front wire W1 is adjusted with the chain block B, and the crane is operated. Thus, the valve body 42 is suspended horizontally by the front wire W1 and the rear wire W2. In FIG. 35, since the length of the front wire W1 and the length of the rear wire W2 are substantially the same, the valve body 42 can be stably suspended horizontally.

As shown in FIG. 36, the wheel stopper 41c is removed, the valve body 42 is horizontally moved away from the valve box 41 by operating a crane, and the valve body 42 is removed from the inside of the valve box 41 (three-part removal process). 2nd step completed).

Next, the third step of the three-part removal step will be explained. As shown in FIG. 37, the valve body temporary holder 41b is removed, the hanging tool C and the wire W are attached to the valve box 41, and the valve box 41, which has been unfastened from the bolts and nuts to the flange 2b of the branch part 2a, is lifted onto a crane. (The third step of the three-part removal process is completed).

Thereafter, as shown in FIG. 38, an annular reinforcing member 16 is fixed to the flange 2b with bolts and nuts (not shown). The reinforcing member 16 has an annular convex portion extending in the axial direction that is fixed to the flange 2b and comes into contact with the upper lid portion 14 of the butterfly valve 10, thereby reinforcing the prevention of the butterfly valve 10 from coming off.

In this manner, in the three-divided removal process, the working valve 4 is divided into three parts: a first divided body made up of the valve lid 43, a second divided body made up of the valve body 42, and a valve box 41. The working valve 4 can be removed by dividing it into third divided bodies and removing them in order from the branch portion 2a of the housing 2. As a result, when the working valve 4 is removed from the branch part 2a in an assembled state (the working valve 4 has a total weight of 10,500 kg), or when the working valve 4 consisting of multiple members is divided into parts less than the number of parts and removed ( For example, compared to the case where three parts are separated into two parts and removed), the weight load on the crane can be distributed and reduced, so the crane can be made smaller, and the work valve 4 can be removed. Work space can be saved.

Further, when assembling the working valve 4, a first divided body made up of the valve cover 43, a second divided body made up of the valve body 42, and a third divided body made up of the valve body 41 are assembled. , and when removing the working valve 4, a first divided body consisting of the valve cover 43, a second divided body consisting of the valve body 42, and a second divided body consisting of the valve body 41 are separated. The three divided bodies and are transported separately. In other words, since the divided body when assembling the working valve 4 and the dividing body when removing the working valve are the same, it is possible to use the same crane and work in the same work space when assembling and disassembling the working valve 4. Since this is possible, it is possible to reduce the work effort and costs such as arranging multiple cranes.

In the case of the modification shown in FIGS. 6 and 7 in which the valve body 42 and the feed screw 43a are connected, the feed nut 42f' screwed onto the tip of the feed screw 43a is connected to the valve body 42. The connection between the valve body 42 and the valve lid 43 can be released by pulling it out upward from the storage portion 42g. Other procedures are the same as those described above.

[Other three-part removal process]
Next, another three-part removal process, which is a process of removing the working valve 4 and the short pipe 45 from the branch part 2a of the housing 2, will be explained. The other three-part removal process includes a first process of removing the valve cover 43 from the valve box 41 in which the valve body 42 is housed, a second process of extracting the valve body 42 from the valve box 41, and a second process of removing the valve body 43 from the short pipe 45. and a fourth step of removing the short pipe 45 from the branch portion 2a.

Note that the short pipe 45 is a pipe member attached between the flange 2b of the branch portion 2a and the valve box 41. By arranging the working valve 4 on the short pipe 45, the valve body 42 can move above the opening/closing shaft 12 of the butterfly valve 10, so contact between the opening/closing shaft 12 and the valve body 42 is avoided. There is. Further, explanations that overlap with the above-mentioned three-part removal process will be omitted.

First, the first step of the other three-part removal process will be explained. As shown in FIG. 39, the electric driver 43b rotates the feed screw 43a to advance the valve body 42 into the valve box 41 to the rear end. That is, the entire valve body 42 is housed within the valve box 41. Then, attach the hanger C, wire W, and chain block B to the valve lid 43, and release the fastening of the mating flange between the side end of the valve box 41 and the side end of the valve lid 43 using the bolts and nuts 44 (see FIG. 9). . The valve lid 43 that has been disengaged from the valve box 41 is suspended horizontally in the same manner as before the disengagement.

Next, while drawing the valve cover 43 in a direction to separate it from the valve box 41, the feed screw 43a is rotated using an electric screwdriver 43b (see FIG. 32) to maintain the position of the valve body 42. Then, the valve body removal prevention plate 41d is attached to the opening 41a of the valve box 41 with bolts through a gap (for example, about 100 mm) between the mating flanges of the side end of the valve box 41 and the side end of the valve lid 43.

Furthermore, the feed screw 43a is rotated using the electric screwdriver 43b, the tip of the feed screw 43a is detached from the feed nut 42f inside the valve body 42, and the valve cover 43 is removed as shown in FIG. The first step of the dividing and removing process is completed).

Next, the second step of the other three-part removal process will be explained. Referring to FIG. 39, first, the valve body 42 is pressed in the extraction direction with a crowbar or the like through the opening of the branch portion 2a of the housing 2. At this time, the front wheel 42c and the plurality of side wheels 42i of the valve body 42 allow the valve body 42 to be moved even by human power. Further, by moving the valve body 42 until it comes into contact with the valve body removal prevention plate 41d, not only is it prevented from coming off, but also the valve body 42 can be placed at a position where the rear eye bolt 42b can be attached. Note that the position adjustment of the valve body 42 does not need to be brought into contact with the valve body retaining plate 41d, and may be changed as appropriate.

The rear wire W2 is passed through the rear eye bolt 42b provided on the valve body 42, and the valve body 42 is hoisted up using a hanging tool C so that it becomes horizontal. Then, as shown in FIG. 40, the valve body removal prevention plate 41d is removed, a plurality of valve body temporary holders 41b are attached to the opening 41a of the valve body 41, and a wheel stopper 41c is attached to the valve body temporary holder 41b. Insert. Thereafter, the crane is operated to move the valve body 42 in the extraction direction.

As shown in FIG. 41, the valve body 42 is moved to a position where the front eye bolt 42a can be attached, the front eye bolt 42a is provided on the valve body 42, the front wire W1 is passed through this, the front wire W1, the rear wire W2 The valve body 42 is suspended horizontally. Then, the wheel stopper 41c is removed, and the valve body 42 is horizontally moved away from the valve box 41 by operating a crane, and the valve body 42 is removed from the inside of the valve box 41 as shown in FIG. The second step of the three-part removal process is completed).

Next, the third step of the other three-part removal process will be explained. As shown in FIG. 43, the valve body temporary holder 41b is removed, the hanging tool C and the wire W are attached to the valve box 41, and the valve box 41, which has been unfastened from the flange of the short pipe 45 using bolts and nuts, is moved with a crane. Remove (end of the third step of the other three-part removal process).

Next, the fourth step of the other three-part removal process will be explained. As shown in FIG. 44, a hanging tool C and a wire W are attached to the short pipe 45, and the short pipe 45, which has been unfastened from the flange 2b of the branch part 2a by bolts and nuts, is removed using a crane (another three-part removal process). 4th step completed). Thereafter, as shown in FIG. 38, the reinforcing tool 16 is fixed to the flange 2b with bolts and nuts (not shown).

In this way, a short distance is provided between the branch part 2a of the housing 2 and the working valve 4 as a contact prevention means to prevent the valve body 42, which is the second divided body, from coming into contact with the butterfly valve 10, which is a fluid valve. Since the pipe 45 is arranged, the working valve 4 can be removed by following almost the reverse procedure of assembling the working valve 4. Thereby, the work can be performed using common equipment when assembling and removing the work valve 4, so that the work can be simplified and the cost related to the work can be reduced.

Note that the fourth step of the other three-part removal process described above may be omitted, and in the preceding third step, the valve box 41 and the short pipe 45 connected to the valve box 41 may be removed together with a crane.

Further, the contact prevention means is not limited to the short pipe 45, and may be changed as appropriate, for example, by making the axial dimension of the valve box long so that the valve body 42 does not come into contact with the fluid valve.

[Two-part removal process]
Next, a two-part removal step, which is a step of removing the working valve 4 from the branch portion 2a of the housing 2, will be described. The two-part removal step consists of a first step of removing the valve cover 43 in which the valve body 42 is housed from the valve box 41, and a second step of removing the valve box 41 from the branch portion 2a.

In addition, in this explanation, the working radius can be made smaller than when assembling the working valve 4 by changing the arrangement of the crane, etc., and the crane has enough lifting capacity (weight limit) to lift the valve cover 43 together with the valve body 42. shall be satisfied. Further, explanations that overlap with the above-mentioned three-part removal process will be omitted.

First, the first step of the two-part removal step will be explained. As shown in FIG. 45, a hanging tool C, a wire W, and a chain block B are attached to the valve lid 43 in which the valve body 42 is housed, and the side ends of the valve box 41 and the valve lid 43 are connected by bolts and nuts 44. Unfasten the mating flanges at the side ends. The valve lid 43 that has been disengaged from the valve box 41 is suspended horizontally by the wire W and the chain block B in the same way as before the disengagement. Then, the valve cover 43 is horizontally moved away from the valve box 41 by operating a crane, the valve body 42 is removed from the inside of the valve case 41, and the valve cover 43 is removed together with the valve body 42 (the second step in the two-part removal process). 1 step completed).

Next, the second step of the two-part removal step will be explained. As shown in FIG. 46, a hanging tool C and a wire W are attached to the valve box 41, and the valve box 41, which is released from the flange 2b of the branch part 2a by bolts and nuts, is removed (second step of the two-part removal step). end). Thereafter, as shown in FIG. 38, the reinforcing tool 16 is fixed to the flange 2b with bolts and nuts (not shown).

In this way, in the two-divided removal process, the working valve 4 is divided into the first divided body made up of the valve body 42 and the valve lid 43 and the second divided body made up of the valve body 41. The working valve 4 can be removed by removing these parts in order from the branch part 2a of the housing 2. As a result, compared to the case where the work valve 4 is removed from the branch part 2a in an assembled state (the work valve 4 has a total weight of 10,500 kg), the weight load on the crane can be distributed and reduced, so the crane can be made smaller. This allows the work space for removing the work valve 4 to be saved.

In addition, in the first step of the two-part removal step, the valve body 42 can be removed from the inside of the valve box 41 by moving the valve cover 43 in the horizontal direction. , compared to a configuration in which the valve body 42 is removed from the valve box 41 using the valve body temporary holder 41b, the front eye bolt 42a, the rear eye bolt 42b, the eye bolt 42j, etc., the work of removing the valve body 42 is simplified. can do.

In addition, in the first step of the two-part removal step, the feed screw 43a of the valve cover 43 is screwed into the feed nut 42f of the valve body 42 as a detachment preventing means, and is prevented from detaching from the valve cover 43. Therefore, the first step of the work valve removal step can be carried out simply and safely.

Furthermore, in the first step of the two-part removal step, the valve cover 43 is removed with the valve body 42 accommodated, so there is no need to advance the valve body 42 into the valve box 41. 42 is prevented from coming into contact with the opening/closing shaft 12 of the butterfly valve 10.

Further, when assembling the working valve 4, a first divided body made up of the valve cover 43, a second divided body made up of the valve body 42, and a third divided body made up of the valve body 41 are assembled. , and when removing the working valve 4, separately transport the first divided body consisting of the valve body 42 and the valve cover 43, and the second divided body consisting of the valve box 41. do. That is, since there are fewer divided bodies when the working valve 4 is removed than there are divided bodies when the working valve 4 is assembled, the number of man-hours required for removal can be reduced.

In addition, when assembling the working valve 4, it is possible to assemble the working valve 4 with higher accuracy compared to a structure in which a valve cover with a valve body inserted is attached to a valve box, as in Patent Document 1, for example. be able to. Therefore, it is suitable especially when high sealing performance is required.

Furthermore, when the working valve 4 is removed, the water at the branch portion 2a of the housing 2 is shut off by the butterfly valve 10. Therefore, even if the number of divided bodies is reduced during disassembly compared to when assembling the work valve 4, problems are less likely to occur, so that work efficiency can be improved.

[Other two-part removal process]
Next, another two-part removal process, which is a process of removing the working valve 4 and the short pipe 45 from the branch part 2a of the housing 2, will be explained. The other two-part removal process is a first process in which the valve cover 43 is removed from the valve box 41 in which the valve body 42 is housed, and a second process in which the valve box 41 in which the valve body 42 is housed is removed together from the short pipe 45. and a third step of removing the short pipe 45 from the branch portion 2a. Note that the explanation that overlaps with the above-mentioned two-part removal process will be omitted.

First, the first step of the other two-part removal process will be explained. As shown in FIG. 47, the feed screw 43a is rotated using an electric screwdriver 43b to advance the valve body 42 until the rear end thereof is positioned inside the valve box 41. Then, the hanging tool C, the wire W, and the chain block B are attached to the valve lid 43, and the fastening of the mating flanges between the side ends of the valve box 41 and the side ends of the valve lid 43 by the bolts and nuts 44 is released. The valve lid 43 that has been disengaged from the valve box 41 is suspended horizontally by the wire W and the chain block B in the same way as before the disengagement.

Next, the valve body 42 is held in position by rotating the feed screw 43a with the electric screwdriver 43b while pulling the valve cover 43 in a direction away from the valve box 41 by operating a crane. Then, the valve body removal prevention plate 41d is attached to the opening 41a of the valve box 41 with bolts through a gap (for example, about 100 mm) between the mating flanges of the side end of the valve box 41 and the side end of the valve lid 43.

Furthermore, the feed screw 43a is rotated using the electric screwdriver 43b, and the tip of the feed screw 43a is detached from the feed nut 42f inside the valve body 42, and the valve cover 43 is removed (the first step of the other two-part removal process is completed). ).

Next, the second step of the other two-part removal process will be explained. As shown in FIG. 48, a hanging tool C and a wire W are attached to the valve box 41 in which the valve body 42 is housed, and the valve body 41, which has been unfastened from the short pipe 45 using bolts and nuts, is attached together with the valve body 42. Remove (end of the second step of the other two-part removal process).

Next, the third step of the other two-part removal process will be explained. Referring to FIG. 44, a hanging tool C and a wire W are attached to the short pipe 45, and the short pipe 45, which has been unfastened from the flange 2b of the branch part 2a by bolts and nuts, is removed using a crane (as in the other two-part removal process). 3rd step completed). Thereafter, as shown in FIG. 38, the reinforcing tool 16 is fixed to the flange 2b with bolts and nuts (not shown).

In this way, in the other two-divided removal step, the working valve 4 is divided into a first divided body made up of the valve lid 43 and a second divided body made up of the valve body 42 and the valve body 41. The work valve 4 can be removed by dividing the parts and removing them in order from the branch part 2a of the housing 2. As a result, compared to the case where the work valve 4 is removed from the branch part 2a in an assembled state (the work valve 4 has a total weight of 10,500 kg), the weight load on the crane can be distributed and reduced, so the crane can be made smaller. This allows the work space for removing the work valve 4 to be saved.

In addition, in the second step of the other two-part removal process, since the valve body 42 housed in the valve box 41 is prevented from coming off by the valve body removal prevention plate 41d as a detachment prevention means, the chain block B1, B2, wires W2 to W5, valve body temporary holder 41b, front eye bolt 42a, rear eye bolt 42b, eye bolt 42j, etc. are used to remove the valve body 42 from inside the valve box 41. The work of removing the can be simplified. Note that the third step of the other two-part removal step described above is omitted, and in the second step before that, the short pipe 45 connected to the valve box 41 is removed together with the valve box 41 and the valve body 42 using a crane. It's okay.

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 any changes or additions that do not depart from the gist of the present invention are included in the present invention. It will be done.

For example, in the above-mentioned embodiment, in the method of attaching the working valve 4, a feed screw 43a and an electric driver 43b are provided as operating parts on the valve cover 43, and the tip of the feed screw 43a is screwed into the feed nut 42f inside the valve box 41. Although the embodiment in which the valve body 42 and the feed screw 43a are connected is illustrated, the present invention is not limited to this, and the present invention is not limited to this. It's okay.

For example, in the embodiment described above, the butterfly valve 10 is used as the fluid control, but the present invention is not limited thereto. For example, the fluid control may be a gate valve, a plug, a switching valve, or the like. For example, in the embodiment described above, the butterfly valve 10 is constructed from a plurality of divided bodies, but the present invention is not limited to this, and the fluid control may be constructed integrally.

1 Fluid pipe 2 Housing 2a Branch part (opening part)
2b Flange (locking part)
4 Working valve 5 Cutting machine 6 Valve introducing machine 7 Jack 8 Drive mechanism 10 Butterfly valve 11 Partition wall 12 Opening/closing shaft 13 Valve element 14 Upper cover part 15 Suppressing means 20 Housing 41 Valve box 41a Opening part 41b Valve element temporary holder (mounted) (Okibe)
41c Wheel stopper 41d Valve body removal prevention plate (regulating means)
41e Slide groove 42 Valve body 42a Front eye bolt (hanging branch)
42b Rear eye bolt (hanging branch)
42f Feed nut 42g Storage part 42h Nut removal prevention plate 43 Valve lid 43a Feed screw (valve stem, operation part)
43b Electric screwdriver (operation unit)
51 Mounting flange cylinder 52 Cutter 53 Lid 61 Cylindrical member 62 Locking member 63 Mounting flange cylinder 65 Lid 81, 81' Shaft member 86 Case part

Claims (6)

A method for installing a work valve for performing a predetermined work in an uninterrupted state in a housing that is installed in a sealed manner with respect to a fluid pipe, the method comprising:
The working valve includes a valve box attached to an opening of the housing, a valve lid attached to the valve box, and a valve body provided so as to be movable back and forth within the valve box and the valve lid. ,
a first step of installing the valve box in the opening of the housing;
a second step of inserting the valve body into the valve box;
a third step of connecting the valve body and an operating part for advancing and retracting the valve body , and regulating the retreat of the valve body inserted into the valve box by a regulating means ;
A method for attaching a working valve, comprising: a fourth step of attaching the valve cover to the valve box. A method for installing a work valve for performing a predetermined work in an uninterrupted state in a housing that is installed in a sealed manner with respect to a fluid pipe, the method comprising:
The working valve includes a valve box attached to an opening of the housing, a valve lid attached to the valve box, and a valve body provided so as to be movable back and forth within the valve box and the valve lid. ,
a first step of installing the valve box in the opening of the housing;
a second step of inserting the valve body into the valve box;
a third step of connecting the valve body and an operating section for moving the valve body forward and backward;
A method for attaching a working valve , comprising: a fourth step of attaching the valve cover to the valve box while the entire valve body is inserted into the opening of the valve box . A method for installing a work valve for performing a predetermined work in an uninterrupted state in a housing that is installed in a sealed manner with respect to a fluid pipe, the method comprising:
The working valve includes a valve box attached to an opening of the housing, a valve lid attached to the valve box, and a valve body provided so as to be movable back and forth within the valve box and the valve lid. ,
a first step of installing the valve box in the opening of the housing;
a second step of inserting the valve body into the valve box;
a third step of connecting the valve body and an operating section for moving the valve body forward and backward;
A method for attaching a working valve, comprising: a fourth step of attaching the valve cover close to the valve box by operating the operation part connected to the valve body . A method for installing a work valve for performing a predetermined work in an uninterrupted state in a housing that is installed in a sealed manner with respect to a fluid pipe, the method comprising:
The working valve includes a valve box attached to an opening of the housing, a valve lid attached to the valve box, and a valve body provided so as to be movable back and forth within the valve box and the valve lid. ,
a first step of installing the valve box in the opening of the housing;
a second step of inserting the valve body into the valve box;
a third step of attaching and connecting a tip of a valve rod provided on the valve lid for moving the valve body forward and backward, to the rear end of the valve body inserted into the valve box;
A method for attaching a working valve , comprising: a fourth step of attaching the valve cover to the valve box . In the second step, the valve body is suspended by a plurality of hanging branches in the traveling direction, and after the front side of the valve body is inserted into the valve box, the hanging branches are sequentially supported from the front side in the traveling direction. 5. The method for installing a working valve according to claim 1 , wherein the work valve is released. In the second step, the front side of the valve body in the direction of movement is placed on a mounting portion provided protruding from the opening of the valve box, and then the valve body is inserted into the valve box. A method for attaching a working valve according to any one of claims 1 to 4 .

Images