JP6696705B2 - Water diversion core mounting device - Google Patents

Description

  This invention, when providing a branch pipe by branching a water main, in the preparatory step before the attachment of the water diversion core, which is attached in close contact with a water diversion hole formed in the water main by a mounting jig, The present invention relates to a water diversion core mounting device that can be held in the mounting jig so as not to fall off.

  When branching a water main to provide a branch pipe, first a water diversion hole is bored in the water main, and a core (sometimes referred to as an "anticorrosion sleeve") is attached in a close contact state to this water diversion hole. To do. This prevents water leakage and corrosion from around the water diversion holes. As such a water diversion core, a combination of a resin sleeve and a metal sleeve is known (Patent Documents 1 to 3).

  Further, a jig for mounting the water diversion core in the water diversion hole is also known, and in particular, in Patent Document 4, an insertion rod of a multi-specific contact core type corresponding to several kinds of cores having different specifications (see It is also referred to as a "letcher".) Is disclosed.

  At the time of actual construction, as shown in FIG. 9, the water diversion core 10 is initially in a temporary assembly state in which the metal sleeve 12 is fitted in the resin sleeve 11 only one step, and the metal sleeve is An annular convex portion provided on the inner peripheral surface of the resin sleeve 11 by inserting a head portion 20 (also referred to as a “stretcher head”) attached to the tip side of the mounting jig from the 12 side. 13 engages with an annular recess 21 provided on the outer periphery of the head portion 20, and holds (sets) the water diversion core 10 so that it does not fall off from the head portion 20 even when facing downward. Next, with the water diversion core 10 set in the head portion 20, the resin jig 11 is positioned and inserted into a water diversion hole (not shown) previously drilled from the resin sleeve 11 side, and then the mounting jig is set. When the head portion 20 is pressed toward the water diversion hole by operating, the metal sleeve 12 is press-fitted into the resin sleeve 11 placed in the water diversion hole, and the resin sleeve 11 is expanded by this press-fitting. The water diversion core 10 can be mounted in a close contact with the water diversion hole. After that, if the mounting jig is pulled up, the set state of the head portion 20 with the water diversion core 10 is easily released, and only the mounting jig can be removed.

  As described above, in the branching work of the water mains, if the water-division core 10 in the temporarily assembled state is held (set) in advance by the force that does not drop onto the head portion 20 of the mounting jig, The work core 10 is integrated with the mounting jig, and the work from the positioning to the water diversion hole to the mounting can be performed in a single unit, and the workability is good.

Japanese Utility Model Publication No. 7-23892 JP 2001-304487 A JP, 2006-10047, A JP, 2006-90370, A

  As described above, the water diversion core 10 has the mounting orientation. Therefore, when the water dividing core 10 in the temporarily assembled state is set on the head portion 20 of the mounting jig in preparation for attachment to the water diversion hole, the resin sleeve 11 is always directed downward (inserted into the water diversion hole first). Direction). In other words, the head part 20 of the mounting jig must be inserted from the metal sleeve 12 side to be in the set state, but at the site, the head part 20 is inserted in the opposite direction, that is, from the resin sleeve 11 side. It may happen.

  In this case, as shown in FIG. 10, when the protrusion 13 is formed on the inner surface of the portion of the resin sleeve 11 into which the metal sleeve 12 is press-fitted, like the water diversion core 10 shown in FIG. The water dividing core 10 in the temporarily assembled state is set in a state where it does not drop from the head portion 20 of the mounting jig even in the reverse direction due to the friction between the convex portion 13 of the resin sleeve 11 and the outer peripheral surface of the head portion 20. Will end up. Therefore, there is a problem that the worker performs the work of mounting the water diversion core 10 without noticing that the water diversion core 10 is in the wrong orientation. Even if the mounting work is performed in such a reverse direction, not only the function of the water diversion core 10 is not exerted, but also the water diversion hole may be damaged or the water mains may be adversely affected.

  The present invention has been made to solve the above-mentioned problems, and the object thereof is to set the water diversion core so that it does not fall into the mounting jig only when it is in the correct mounting direction. An object of the present invention is to provide a mounting device for a water diversion core.

  In order to achieve the above-mentioned object, in the present invention, a water diversion core in a temporarily assembled state in which one end side of a metal sleeve is fitted to the other end side of a resin sleeve whose one end side is in close contact with a water diversion hole, and A mounting jig that has a head portion that is inserted into the water diversion core from the side of the metal sleeve and that can press-fit the metal sleeve toward the contact portion of the resin sleeve. Further, the head portion is provided with a plunger in which a movable convex portion that can be retracted from the outer peripheral surface of the head portion is biased in the protruding direction.

  When the head portion is inserted from the metal sleeve side, the movable convex portion elastically engages with the metal sleeve. As a result, the water diversion core can be held by the head portion. During this period, the movable convex portion is retracted by the inner peripheral surface of the metal sleeve in the direction of being buried inside the head portion against the biasing force from the start of insertion of the head portion to the engagement, and reaches the predetermined position. It momentarily projects outward and resiliently engages the metal sleeve. As a result, the setting of the water diversion core to the mounting jig is completed, and even if the head portion is directed downward in this state, the water diversion core is maintained in the head portion without falling off.

  Once the water diversion core is set, insert the resin sleeve (close contact part) into the branch hole and press the head of the mounting jig to press the metal sleeve into the close contact part of the resin sleeve in the same way as before. Then, the diameter of the contact portion is expanded and brought into close contact with the water diversion hole, and the mounting of the water diversion core is completed. After the mounting is completed, if the mounting jig is pulled up, the movable convex portion of the plunger is buried inside the head portion against the biasing force, and the entire mounting jig can be removed together with the head portion.

  On the other hand, when the head portion is inserted from the resin sleeve side, the movable convex portion does not engage with the resin sleeve. As a result, the water diversion core is in a state where it can be freely dropped from the head portion. In other words, when the head part is inserted in the water diversion core in the temporarily assembled state in the opposite direction, the movable convex part does not act at all, and if the head part is faced down, the water diversion core easily falls off by free fall. Is. Therefore, since the water diversion core falls off, the water diversion core cannot be installed in the branch hole as it is, and the worker at the site also has the wrong orientation of the water diversion core with respect to the head. I noticed that I could set it in the correct direction.

  When the water diversion core is set in the proper orientation, the inner surface of the metal sleeve should be formed uniformly over its entire length with an inner diameter smaller than the tight contact portion of the resin sleeve, so that the head can be held more securely. preferable.

  On the other hand, when the water diversion core is set in the opposite direction, as a configuration for more surely falling off from the head portion, when the head portion of the mounting jig is inserted from the resin sleeve side, the movable convex portion projects the maximum amount, In addition, it is preferable that a gap be formed between the tip of the movable convex portion protruding by the maximum amount and the inner peripheral surface of the contact portion.

  Further, as a more specific means, it is preferable that the resin sleeve has a uniform inner diameter of the contact portion, while the metal sleeve is provided with an annular concave portion in a part of the inner peripheral surface in the circumferential direction. The head portion of the jig has an outward flange capable of contacting with the upper edge portion of the other end of the metal sleeve when inserted from the metal sleeve side, and the flange is attached to the upper edge portion of the other end of the metal sleeve. By providing the head portion and the metal sleeve with the plunger and the annular concave portion, respectively, so that the movable convex portion of the head portion elastically engages with the annular concave portion of the metal sleeve when abutting. When the water dividing core in the temporarily assembled state is set on the head portion, excessive insertion of the head portion is restricted, and the movable convex portion can be reliably engaged with the annular concave portion.

  If the plunger is a ball plunger in which the movable convex portion is composed of a ball, the stroke length of the ball can be shortened, the plunger can be downsized, and the ball can be stably stroked in any direction. You can

  On the other hand, if the movable convex portion is a pin plunger having a pin, the engaging force with respect to the annular concave portion is increased, and the holding force when set on the head portion can be increased.

  According to the present invention, when the water diversion core is set in the head portion of the water diversion core mounting jig in the temporarily assembled state as a preparation before mounting it in the water diversion hole, only when the insertion direction is correct. The water diversion core can be held in the head part and the work of attaching it to the water diversion hole can be continued as it is. On the contrary, when the insertion direction is incorrect, the water diversion core can be removed freely, so it can be attached in advance. It is possible to prevent defects.

Half-cut front view of the water diversion core according to the first embodiment of the present invention Same as above, front view of half-cutting of the head part of the mounting jig Similarly, a half-cut front view showing the initial state of insertion of the head portion into the water diversion core Similarly, a half-cut front view showing a state in which a water diversion core is set in the head portion. Similarly, a half-cut front view showing a state in which the head portion is inserted into the water diversion core in the opposite direction. Half-cut front view of a head portion according to a second embodiment of the present invention Similarly, a half-cut front view showing a state where the water diversion core is set in the head portion. Similarly, a half-cut front view showing a state in which the head portion is inserted into the water diversion core in the opposite direction. Half-cut front view showing a conventional water diversion core mounting device Similarly, the front view of the half-cut when the water diversion core of the conventional device is attached in the opposite direction.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows a water diversion core 1 according to a first embodiment of the device of the present invention, and FIG. 2 shows a head portion 2 of a mounting jig corresponding thereto.

  The water diversion core 1 is composed of a combination of a resin sleeve 3 and a metal sleeve 4. In this embodiment, the resin sleeve 3 is made of polyethylene, for example, and is provided with a cylindrical contact portion 3a in the lower stage, and a cylindrical locking step portion 3b having a diameter larger than that of the contact portion 3a in the axial direction in the upper stage. Are continuously provided. The contact portion 3a has an outer diameter that can be inserted into a water diversion hole (not shown) formed in a water main or the like, and the outer diameter of the locking step portion 3b is larger than that of the water diversion hole. Further, the contact portion 3a has a uniform inner diameter, and the locking step portion 3b has an inner diameter larger than the inner diameter of the contact portion 3a. To achieve. Then, in the mounting, the close contact portion 3a is inserted into the water diversion hole until the locking step portion 3b is locked to the upper surface side of the water diversion hole, and in this state, the metal sleeve 4 is press-fitted to make close contact. The diameter of the portion 3a is expanded so that the outer peripheral surface of the portion 3a is brought into close contact with the circumference of the water diversion hole. This mounting mode is the same as that of the conventional water diversion core.

  On the other hand, the metal sleeve 4 is made of, for example, stainless steel, and has a diameter expansion in which the outer peripheral surface expands toward the other end side from the tapered tip part 4a on one end side through the straight part 4b having a uniform diameter inside and outside. It has a section 4c. Of these, the inner diameter of the straight portion 4b is set to be smaller than the inner diameter of the contact portion 3a of the resin sleeve 4. Further, the mouth portion 4e on the other end side is tapered, and a flat upper edge portion 4d is provided around the mouth portion 4e. An annular recess 4f is provided in a part of the inner peripheral surface of the expanded diameter portion 4c in the inner peripheral direction. The length of the annular recess 4f from the center axis of the metal sleeve 4 (the diameter of the annular recess 4f) is set to be larger than the inner diameter of the straight portion 4b, but smaller than the inner diameter of the contact portion 3a of the resin sleeve 4. There is.

  On the other hand, the head portion 2 of the mounting jig is provided with a cylindrical insertion portion 2b at one end of a mounting shaft portion 2a for mounting the mounting jig body. The main body of the mounting jig for mounting the head portion 2 on the tip side is the same as the existing one, and therefore the details are omitted. In this embodiment, the insertion portion 2b has the same diameter inside and outside over the entire length, is slightly longer than the entire length of the metal sleeve 4, and its outer diameter is set to be slightly smaller than the inner diameter of the contact portion 3a of the resin sleeve 3. There is. Further, an outward flange portion 2c that abuts the upper edge portion 4d of the metal sleeve 4 is provided between the mounting shaft portion 2a and the insertion portion 2b.

  Then, ball plungers 5 are provided back to back at two positions of the insertion portion 2b of the head portion 2. In this ball plunger 5, a ball-shaped movable convex portion 5c which can be retracted from the outer peripheral surface of the head portion 2 is biased by a biasing spring 5b built in the cylinder portion 5a in a direction projecting from the outer peripheral surface. In this embodiment, the cylinder portion 5a is embedded and fixed in the insertion portion 2b of the head portion 2 so that the movable convex portion 5c projects a certain amount from the outer peripheral surface of the insertion portion 2b. The number of plungers 5 is not limited to this embodiment, and may be one or three or more.

  Next, a method of using the device of the present invention including the water diversion core 1 and the head portion 2 will be described. The water diversion core 1 is a part of one end side of the metal sleeve 4 (tapered tip portion 4a and The lower half portion of the straight portion 4b) is fitted into the locking step portion 3b of the resin sleeve 3 to be in a temporarily assembled state (see FIG. 1), and these sleeves 3 and 4 are integrally formed carelessly in normal work. It is designed not to separate. Then, the head portion 2 is inserted from the metal sleeve 4 side into the water dividing core 1 in the temporarily assembled state to prepare for setting before mounting. In this process, the movable convex portion 5c of the plunger 5 is initially Is guided by the tapered mouth portion 4e of the metal sleeve 4 and starts to be embedded in the cylinder portion 5a against the biasing spring 5b (see FIG. 3). When the flange portion 2c of the head portion 2 abuts the upper edge portion 4d of the metal sleeve 4 by sliding on the inner peripheral surface up to the concave portion 4f and further insertion is restricted, the movable convex portion 5c has an annular shape. It elastically engages with the recess 4f (see FIG. 4). In this way, the plunger 5 on the side of the head portion 2 is engaged with the annular recess 4f of the metal sleeve 4, so that the water dividing core 1 in the temporarily assembled state is held in the mounting jig (head portion 2) in the correct orientation ( After that, the holding state can be maintained and the work of mounting the water diversion hole can be performed thereafter.

  In order to more reliably maintain the above-mentioned set state, it is preferable that the movable convex portion 5c engages with the annular concave portion 4f in the state of maximum protrusion, but this is not the case, and the protrusion margin is left ( The movable convex portion 5c engaging with the annular concave portion 4f in a state where the movable convex portion 5c is slightly buried in the cylinder portion 5a is not excluded. This is because in any case, the water diversion core 1 can be set so as to be held on the head portion 2.

  On the other hand, when the head portion 2 is inserted into the water diversion core 1 from the wrong direction, that is, when the head portion 2 is inserted from the resin sleeve 3 side of the water diversion core 1, it is shown in FIG. As described above, the movable convex portion 5c of the plunger 5 protrudes by the maximum amount and has a gap between the movable convex portion 5c and the inner peripheral surface of the contact portion 3a. Therefore, in this case, if the head portion 2 is directed downward, the water diversion core 1 is easily dropped off, and the work of mounting the water diversion hole cannot be performed. Further, when the water diversion core 1 falls off, the worker notices that the direction is wrong and can set the water diversion core 1 on the head portion 2 in the correct direction.

  As a second embodiment, FIG. 6 adopts a pin plunger 6 as a plunger provided in the insertion portion 2b of the head portion 2. In this pin plunger 6, the movable convex portion 6a is a pin type, and the tip end portion of the movable convex portion 6a (pin) is fixed by a predetermined amount from the peripheral surface of the insertion portion 2b by an urging spring 6c built in the cylinder portion 6b. It is configured to project. The other configurations of the head portion 2 and the water diversion core 1 are the same as those in the first embodiment.

  Then, the head portion 2 is inserted from the metal sleeve 4 side, and the movable convex portion 6a elastically engages with the annular concave portion 4f (see FIG. 7), so that the water dividing core 1 in the temporarily assembled state is The head portion 2 can be held, and conversely, when the head portion 2 is inserted from the resin sleeve 3 side, the movable convex portion 6a protrudes by the maximum amount in a state of not contacting the inner peripheral surface of the contact portion 3a (see FIG. 8). The water diversion core 1 can be detached from the head portion 2 as in the first embodiment.

  Regarding the plunger, the pin plunger 6 of the first embodiment has a larger stroke length (maximum protrusion amount) of the movable convex portion than the ball plunger 5 of the second embodiment, but has a difficulty in accurate stroke (rattle occurs. On the other hand, the ball plunger 5 has a shorter stroke length than the pin plunger 6, but has the advantage that the movable convex portion engages with the annular concave portion 4f from all directions, and each has a long and short point.

  By the way, exemplifying the dimensions of the water diversion core 1 and the head portion 2 shown in FIGS. 1 and 2 when the nominal diameter is 40, in FIG. 1, d1 is 36.2 mm, d2 is 35.2 mm, and d3 is It is 35.6 mm, and in FIG. 2, d4 is 36.1 and d5 is 34.9 mm. However, in addition to the above, it goes without saying that the device of the present invention can be applied to those having a nominal diameter of 50 or 25 depending on the size of the branch hole.

1 Water diversion core 2 Head part 2a Mounting shaft part 2b Insertion part 2c Flange part 3 Resin sleeve 3a Adhesive part 3b Locking step part 4 Metal sleeve 4a Tapered tip part 4b Straight part 4c Expanding part 4d Upper edge part 4e Taper Portion 4f Annular recess 5 Pin plunger 5a Cylinder portion 5b Energizing spring 5c Movable convex portion 6 Ball plunger 6a Movable convex portion 6b Cylinder portion 6c Energizing spring

Claims (6)

A water distribution core in a temporarily assembled state by fitting one end side of a metal sleeve into the other end side of a resin sleeve whose one end side is in close contact with the water distribution hole, and the water division core from the metal sleeve side. A mounting jig having a head part that can be inserted into the resin sleeve and press-fitted toward the close contact part of the resin sleeve, and the movable convex part projecting and retractable from the outer peripheral surface of the head part is projected. When the head part is inserted from the side of the metal sleeve, the movable convex part elastically engages with the metal sleeve, while the head part is inserted from the side of the resin sleeve. The water diversion core mounting device, wherein the movable convex portion does not engage with the resin sleeve when inserted. 2. The water diversion core mounting device according to claim 1, wherein the inner peripheral surface of the metal sleeve is formed uniformly over its entire length with an inner diameter smaller than that of the resin sleeve. The water diversion according to claim 1 or 2, wherein when the head portion of the mounting jig is inserted from the resin sleeve side, the movable convex portion projects by a maximum amount, and a gap is formed between the tip of the movable convex portion and the inner peripheral surface of the close contact portion. Core mounting device. 4. The water diversion core mounting device according to claim 1, 2 or 3, wherein the resin sleeve has a uniform inner diameter at the contact portion, and the metal sleeve is provided with an annular recess in a part of the inner peripheral surface in the inner peripheral direction. The head portion of the mounting jig has an outwardly facing flange capable of contacting the upper edge portion of the other end of the metal sleeve when inserted from the metal sleeve side, and the flange has the other edge upper edge portion of the metal sleeve. The head section and the metal sleeve are provided with a plunger and the annular recess so that the movable projection of the head section elastically engages with the annular recess of the metal sleeve when the head section and the metal sleeve contact each other. Item 4. A water diversion core mounting device according to item 4. The water diversion core mounting device according to any one of claims 1 to 5, wherein the plunger is a ball plunger having a movable convex portion formed of a ball.

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