JP3169542U - Fire hydrant box work tool set - Google Patents

Abstract

Provided is a work tool set for a fire hydrant box capable of tightening / removing bolts and nuts connected to a fire hydrant or a repair valve from the ground. A first special wrench 1 having a rod-shaped main body portion 10 and a bolt engaging portion 11 that is provided at a distal end portion of the rod-shaped main body portion 10 and engages a head portion of a bolt, and a rod-shaped main body portion 20 The second special wrench 2 provided at the distal end of the rod-shaped main body 20 and having a nut engaging portion 21 that engages with the nut, and a mount placed at a position where the upper manhole cover of the fire hydrant box is removed. And a depth adjusting jig 3 having a holding portion that can hold the first special wrench 1 in a state in which the insertion depth of the first special wrench 1 is adjusted and the adjustment is completed. (1) With the special wrench 1 held by the depth adjustment jig 3, the second special wrench 2 is operated to enable tightening / removing of the bolts and nuts. [Selection] Figure 5

Description

  The present invention relates to a working tool set for tightening / removing bolts and nuts connected to a fire hydrant or a repair valve installed in an underground fire hydrant box.

  It is necessary to regularly perform maintenance and in-pipe inspections of fire hydrants and repair valves in underground fire hydrant boxes. For example, the inside of the tube is photographed with a camera, and it is checked whether it is operating normally. In such a case, it is necessary to open the manhole cover installed on the ground, enter the space formed in the basement, and tighten / remove the fire hydrant and the bolt / nut of the repair valve.

  However, since the space in which the fire hydrant and the repair valve are installed is small, it is difficult for the worker to work inside.

  The present invention has been made in view of the above circumstances, and the problem is that a work tool for a fire hydrant box capable of tightening / removing bolts and nuts connecting a fire hydrant or a repair valve from the ground. Is to provide a set.

In order to solve the above problems, the working tool set of the fire hydrant box according to the present invention is
A working tool set for tightening / removing bolts and nuts connecting a fire hydrant or repair valve installed in an underground fire hydrant box,
A first special wrench having a rod-shaped main body portion and a bolt engaging portion that is provided at a tip portion of the rod-shaped main body portion and engages a head portion of the bolt;
A second special wrench having a rod-shaped main body portion and a nut engaging portion that is provided at a tip portion of the rod-shaped main body portion and engages with a nut;
The mounting part is mounted at a position where a manhole cover installed at the upper part of the fire hydrant box is removed, and the insertion depth of one of the first special wrench and the second special wrench is set to And a depth adjustment jig having a holding portion capable of holding the one special wrench in a state where the adjustment is completed,
The bolt / nut can be tightened / removed by operating the other special wrench while the one special wrench is held by the depth adjusting jig.

  The operation and effect of the working tool set of the fire hydrant box having such a configuration will be described. This tool set includes a first special wrench, a second special wrench, and a depth adjustment jig. The first special wrench has a bolt engaging portion that engages with the head of the bolt. The second special wrench includes a nut engaging portion that engages with the nut. When tightening / removing bolts and nuts, place the depth adjustment jig at the position where the manhole cover is removed. The depth adjustment jig can hold the first special wrench or the second special wrench. If the first special wrench is held, it is held by the holding portion while adjusting the insertion depth from the ground so that the bolt engaging portion of the first special wrench can be engaged with the bolt. Since the first special wrench is provided with a bolt engaging portion at the tip of the rod-shaped main body, it can be operated from the ground. Moreover, since the 2nd special wrench also has the nut engaging part in the front-end | tip part of a rod-shaped main-body part, operation from the ground is possible. Further, the first special wrench is held by the depth adjusting jig, and the bolt / nut can be tightened / removed only by operating the second special wrench. Therefore, the worker does not have to enter the underground space to work. As a result, it is possible to perform tightening / removal work of bolts and nuts connecting a fire hydrant or a repair valve from the ground.

  In the above configuration, the second special wrench may be held by a depth adjustment jig so that the operator operates the first special wrench.

In the present invention, the holding portion of the depth adjustment jig is formed with a hole through which the rod-shaped main body portion of the one special wrench can pass.
A male screw part formed on the surface of the rod-shaped main body part of the one special wrench, and an adjustment nut screwed into the male screw part, and the adjustment nut is set to a size that cannot pass through the hole; It is preferable that the insertion depth of the one special wrench is set by the screwing position of the adjustment nut.

  According to this configuration, the rod-shaped main body portion of the first special wrench or the second special wrench can pass through the hole of the rod-shaped main body portion. Therefore, the position of the special wrench in the plane can be stabilized. Further, the rod-shaped main body portion is formed with a male screw portion, and an adjustment nut can be screwed into the male screw portion. Since the adjustment nut cannot pass through the hole, the insertion depth of the tip of the special wrench can be determined by the adjustment height of the adjustment nut. This work can also be performed on the ground, and the work can be simplified.

  The mounting portion according to the present invention preferably has a linear main body having a square cross section, and the hole is preferably formed in the middle of the linear main body.

  Since the mounting portion has a linear main body portion with a quadrangular cross section, the mounting portion can be stably placed so as to straddle the manhole hole after the manhole cover is removed. A hole for holding the special wrench is formed in the middle of the linear main body. Accordingly, the handling of the lid adjustment jig and the operation for placing it on the manhole hole can be easily performed.

  The bolt engaging portion according to the present invention is preferably provided with a bolt support portion that prevents the bolt from dropping downward.

  When removing the bolt and nut, the bolt may fall downward after the bolt and nut are completely loosened. Therefore, by providing the bolt support portion, it is possible to prevent the bolt from being accidentally dropped and to prevent the maintenance work from being troubled.

  It is preferable that the said bolt support part which concerns on this invention is a washer which has a hole with a diameter smaller than the head of a bolt.

  Such a washer can surely prevent the bolt from falling, and the configuration of the bolt support portion can also be realized at low cost.

  In the present invention, when operating the other special wrench, the one special wrench is provided with a contact portion for preventing the one special wrench from rotating together, and the contact portion is provided with the fire hydrant or It is preferable that the co-rotation is prevented by contacting the repair valve.

  When tightening / removing bolts and nuts, for example, when loosening a nut with a second special wrench, if the first special wrench engaged with the bolt rotates together, the work cannot be performed efficiently. . Thus, in such a case, the second special wrench can be operated smoothly by preventing the first special wrench from rotating together. The same applies to the case where the second special wrench is prevented from co-rotating when the first special wrench is operated.

The maintenance method of the fire hydrant box using the working tool set of the fire hydrant box according to the present invention is as follows:
A first special wrench having a rod-shaped main body portion and a bolt engaging portion that is provided at a tip portion of the rod-shaped main body portion and engages a head portion of the bolt;
A second special wrench having a rod-shaped main body portion and a nut engaging portion that is provided at a tip portion of the rod-shaped main body portion and engages with a nut;
The mounting part is mounted at a position where a manhole cover installed at the upper part of the fire hydrant box is removed, and an insertion depth of one of the first special wrench and the second special wrench is set. Adjusting and using a working tool set comprising a depth adjustment jig having a holding part capable of holding the one special wrench in a state where the adjustment is completed,
Holding the one special wrench by the holding portion of the depth adjustment jig, and placing the depth adjustment jig;
Adjusting the insertion depth of the one special wrench;
Engaging the bolt engaging part or nut engaging part of the one special wrench with the bolt or nut;
And a step of tightening / removing nuts or bolts by operating the other special wrench.

In the present invention, the holding portion of the depth adjusting jig is formed with a hole through which the rod-shaped main body portion of the one special wrench can pass, and is formed on the surface of the rod-shaped main body portion of the one special wrench. A male screw part and an adjusting nut screwed into the male screw part, the adjusting nut being set to a size that cannot pass through the hole;
It is preferable that the method further includes the step of setting the insertion depth of the one special wrench by adjusting the screwing position of the adjustment nut.

Figure showing the structure of an underground fire hydrant box (A) side view and (b) bottom view showing the first special wrench (A) side view and (b) bottom view showing the second special wrench (A) plan view and (b) side view showing depth adjustment jig Diagram explaining work when removing bolts and nuts using work tool set The figure which shows the principal part of FIG.

  A preferred embodiment of a working tool set for a fire hydrant box according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of an underground fire hydrant box.

<Configuration of fire hydrant box>
A fire hydrant box B is provided on the lower surface (underground) than the ground A. A pipe 100 is placed horizontally in the basement, and a repair valve 102 and a fire hydrant 103 are disposed on a branching portion 101 of the pipe 100. The fire hydrant box B is installed in a space surrounded by the underground wall surface 104. The upper part of the space is closed by a manhole cover 105.

  The fire hydrant 103 has a main body 103a and a flange 103b formed at the lower part of the main body 103a. The repair valve 102 has a main body 102a, an upper flange 102b, and a lower flange 102c. The branch portion 101 includes a vertical main body portion 101a and a flange 101b formed on the upper portion of the main body portion 101a.

  The upper flange 102b of the repair valve 102 and the flange 103b of the fire hydrant 103 are connected by bolts 200 and nuts 201 at a plurality of locations along the circumferential direction. The flange 101b of the branching portion 101 and the lower flange 102c of the repair valve 102 are also connected by bolts 202 and nuts 203 at a plurality of locations along the circumferential direction.

  The fire hydrant box B needs to be regularly maintained. For example, it is necessary to remove the fire hydrant 103 when performing maintenance of the fire hydrant 103 or the repair valve 102 or conducting an in-pipe inspection of the pipe 100 with a camera. In order to remove the fire hydrant 103, it is necessary to remove the bolt 200 and the nut 201 described above. Further, after the maintenance is completed, it is necessary to tighten the bolt 200 and the nut 201 again. It is quite difficult for an operator to perform such work in an underground space because the space is small. Therefore, in the present invention, a working tool set is used so that bolts and nuts can be tightened / removed from the ground.

<Working tool set>
The working tool set includes a first special wrench, a second special wrench, and a depth adjustment jig. FIG. 2 is a (a) side view and (b) bottom view showing the first special wrench 1. FIG. 3A is a side view and FIG. 3B is a bottom view showing the second special wrench 2. FIG. 4A is a plan view and FIG. 4B is a side view showing the depth adjusting jig 3.

  The 1st special wrench 1 has the rod-shaped main-body part 10, the external thread part 10a is provided in the upper surface, and the lower side becomes the tool connection part 10b. The tool connection part 10b is comprised with the metal shaft member, the lower end of the external thread part 10a is inserted in the upper end part, and is fixed by welding. The bolt engaging portion 11 is fixed to the lower end portion of the tool connecting portion 10b. The bolt engaging portion 11 has a hole 11a (for example, a hexagonal hole) that can be engaged with the head of the bolt. As shown in FIG. 2A, the bolt engaging portion 11 is L-shaped in a side view, and its upper end is inserted into the lower end portion of the tool connecting portion 10b and is fixed by welding. As will be described later, a nut for height adjustment is screwed into the male screw portion 10a.

  A washer 12 that functions as a bolt support portion is fixed to the back side of the hole 11a of the bolt engaging portion 11 by a method such as welding. Since the inner diameter of the washer 12 is smaller than that of the hole 11a, it can be prevented from dropping even after the bolt is loosened.

  A contact portion 13 for preventing co-rotation is attached to the upper surface of the bolt engaging portion 11 adjacent to the hole 11a. As shown in FIG. 2B, it has a shape orthogonal to the shape of the bolt engaging portion 11, and has a first contact portion 13a and a second contact portion 13b. The function of the contact portion 13 is to prevent the first special wrench 1 from rotating together when a bolt or nut is tightened / removed as will be described later.

  As shown in FIG. 3, the second special wrench 2 has a rod-like main body portion 20 and is formed of a metal shaft member. An operation portion 22 is fixed to the upper end portion of the rod-shaped main body portion 20 by welding. The operation unit 22 has a ring-shaped portion, and an operator can perform an operation such as rotating the second special wrench 2 by operating with this portion.

  A nut engaging portion 21 is fixed to the lower end portion of the rod-shaped main body portion 20. The nut engaging portion 21 has an engaging groove 21a for engaging the nut. As shown in FIG. 3A, the nut engaging portion 21 is L-shaped in a side view, and an upper end of the nut engaging portion 21 is inserted into a lower end portion of the rod-like main body portion 20 and fixed by welding.

  As shown in FIG. 4, the depth adjusting jig 3 is formed with a linear main body 30 (corresponding to a mounting portion) having a square cross section and a hole 31 in the middle of the linear main body 30. The inner diameter of the hole 31 is set to a size that allows the male screw portion 10a of the first special wrench 1 to pass therethrough. The inner diameter of the hole 31 is set to such a size that a depth adjusting nut described later cannot pass through. Therefore, the nut and the hole 31 constitute a holding part for the special wrench.

  The quadrangular shape is not limited to a specific size and a specific aspect ratio. It may be rectangular or square. Since it has a quadrangular cross section, the manhole cover 105 can be stably placed without being rolled.

<Working>
Next, the operation for removing the bolts and nuts using the above working tool set will be described with reference to FIG. Here, in order to remove the fire hydrant 103 from the repair valve 102, an operation when the bolt 200 and the nut 201 are loosened and removed will be described. FIG. 5 shows a state where the working tool set is set, FIG. 6 shows an enlarged view of the main part, (a) a side view of the main part and (b) a bottom view of the waist part. When the fire hydrant 103 is removed, the repair valve 102 is set in a closed state.

  First, the male screw portion 10 a of the first special wrench 1 is inserted from below the hole 31 of the depth adjustment jig 3. Next, the nut 32 for depth adjustment is inserted and screwed from the upper end of the male screw portion 10a. Since the outer diameter of the tool connecting portion 10b is set so as not to pass through the hole 31, the first special wrench 1 is prevented from falling off the depth adjusting jig 3 by screwing the nut 32. Become. In this state, the straight main body 30 of the depth adjustment jig 3 is placed horizontally on the upper part of the manhole hole of the fire hydrant box B with the manhole cover 105 removed. The depth adjusting jig 3 is merely placed so as to straddle the manhole hole, and the inside of the hole, that is, the state of the fire hydrant 103 and the repair valve 102 can be observed from the ground.

  The operator adjusts the insertion depth so that the height of the bolt engaging portion 11 of the first special wrench 1 matches the height of the bolt 200 on the back surface of the upper flange 102b while observing the inside of the manhole hole. . Such adjustment can be performed while moving the nut 32 in the vertical direction, and the adjustment is completed when the nut 32 is set at a matching position. The state shown in FIGS. 5 and 6 is a state where the adjustment is completed, and even if the worker releases his hand from the first special wrench 1, the state where the adjustment is completed is maintained.

  The operator operates the other second special wrench 2 to operate from the ground so that the engaging groove 21 a of the nut engaging portion 21 is engaged with the nut 201. The nut 201 is located on the upper surface of the flange 103b and can be easily observed from the ground. After the engagement of the nut 201 is completed, the worker can loosen the nut 201 by holding and rotating the operation portion 22 of the second special wrench 2. During this operation, the bolt 200 (first special wrench 1) also tries to rotate together with the rotation of the nut 201 (direction C in FIG. 6B, so-called co-rotation). However, as shown in FIG. 6, since the second contact portion 13b of the contact portion 13 contacts the flange 102b, it does not rotate any more. As a result, common rotation can be prevented and the operation can be performed smoothly. Note that the place of contact may be the flange 103b.

  Even after the bolt 200 is completely loosened, the washer 12 is provided on the back surface of the bolt engaging portion 11, and the bolt 200 does not fall downward. After the removal of the bolts and nuts is completed, the working tool set can be removed and the fire hydrant 103 can be lifted up. Thereby, maintenance work can be started.

  After the maintenance work is completed, it is necessary to attach the fire hydrant 103 on the repair valve 102 again. At this time, the bolts and nuts can be tightened by performing an operation reverse to the operation for removing the bolts and nuts. In this case, the joint rotation can be prevented by the other first contact portion 13 a of the contact portion 103.

  As described above, since the fire hydrant 103 can be removed from the ground, workability is improved.

<Another embodiment>
In this embodiment, although the operation | movement when removing the fire hydrant 103 from the repair valve 102 was demonstrated, also when removing from the repair valve 102 and the branch part 101, the working tool set which concerns on this invention can be used.

  In the present embodiment, the first special wrench 1 is held by the depth adjustment jig 3 and the second special wrench 2 is operated by an operator, but this relationship may be reversed. Further, in this embodiment, the flanges are tightened so that the bolt 200 is positioned on the lower side and the nut 201 is positioned on the upper side, but when the bolt 200 is positioned on the upper side and the nut 201 is positioned on the lower side, The working tool set according to the present invention can be used. The same applies to the bolt 202 and the nut 203.

B Fire hydrant box 1 1st special wrench 2 2nd special wrench 3 Depth adjustment jig 10 Rod-like main body 10a Male thread 11 Bolt engagement part 12 Washer 13 Contact part 13a First contact part 13b Second contact part 20 Bar-shaped main body portion 21 Nut engaging portion 21a Engaging groove 30 Linear main body portion 31 Hole 32 Nut 100 Piping 101 Branching portion 102 Repair valve 103 Fire hydrant 200, 202 Bolt 201, 203 Nut

Claims (6)

A working tool set for tightening / removing bolts and nuts connecting a fire hydrant or repair valve installed in an underground fire hydrant box,
A first special wrench having a rod-shaped main body portion and a bolt engaging portion that is provided at a tip portion of the rod-shaped main body portion and engages a head portion of the bolt;
A second special wrench having a rod-shaped main body portion and a nut engaging portion that is provided at a tip portion of the rod-shaped main body portion and engages with a nut;
The mounting part is mounted at a position where a manhole cover installed at the upper part of the fire hydrant box is removed, and the insertion depth of one of the first special wrench and the second special wrench is set to And a depth adjustment jig having a holding portion capable of holding the one special wrench in a state where the adjustment is completed,
The operation of the fire hydrant box, wherein the bolt / nut can be tightened / removed by operating the other special wrench while the one special wrench is held by the depth adjusting jig. Tool set. The holding portion of the depth adjustment jig is formed with a hole through which the rod-shaped main body portion of the one special wrench can pass,
A male screw part formed on the surface of the rod-shaped main body part of the one special wrench, and an adjustment nut screwed into the male screw part, and the adjustment nut is set to a size that cannot pass through the hole; The working tool set for a fire hydrant box according to claim 1, wherein an insertion depth of the one special wrench is set by a screwing position of the adjustment nut. The working tool set for a fire hydrant box according to claim 2, wherein the placing portion has a linear main body portion having a square cross section, and the hole is formed in the middle of the linear main body portion. The work tool for a fire hydrant box according to any one of claims 1 to 3, wherein the bolt engaging portion is provided with a bolt support portion that prevents the bolt from falling downward. set. 5. The working tool set for a fire hydrant box according to claim 4, wherein the bolt support portion is a washer having a hole having a smaller diameter than a head portion of the bolt. When operating the other special wrench, the one special wrench is provided with a contact portion for preventing the one special wrench from rotating together, and the contact portion is provided on the fire hydrant or the repair valve. The working tool set for a fire hydrant box according to any one of claims 1 to 5, wherein the co-rotation is prevented by contact.

Images