JPH0332873Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is mainly installed in floor slabs of laboratories, laboratories, medical rooms, etc., and is used for hot water supply, water supply, fuel gas, or drainage from under the floor. This invention relates to improvements in sleeve boxes for floor slab piping, which are effectively used for various types of piping such as electrical wiring and other electrical wiring.

[Conventional technology]

In general, for various types of piping to laboratories, etc., the floor slab penetration piping method, that is, the piping method in which the piping is run vertically through the floor slab from under the floor, is cheaper than other piping methods, and it is easier to change the piping. It is widely used for the following reasons. However, this floor slab penetration piping system has the disadvantage that it impairs the waterproofness of the floor surface and requires additional construction work such as drilling and backfilling holes in the floor slab when increasing or decreasing the number of piping.

In order to solve these problems, a so-called sleeve box for floor slab piping has been developed in recent years, and its use has increased. This sleeve box for floor slab piping has a configuration as shown in Figure 4.
A box body 1 made of cast iron or the like which is buried in a floor slab A and has a box shape with an open top and a bottom, and a plurality of sleeve mounting holes 3 arranged in a row on a bottom plate 2 of the box body 1. , and a sleeve 4 that is individually and detachably screwed into each sleeve mounting hole 3 from above so that the lower piping B can be screwed into it, and a joint valve is provided at the top of each sleeve 4. A pipe joint 5 or a pipe joint 6 is screwed onto the pipe so that it can be connected to an upper pipe (not shown). Other accessories include a plug 7 that screws into the sleeve mounting hole 3 instead of the sleeve 4 when not in use, and a lid that closes the top surface of the box body 1 flush with the top surface a of the floor slab. It is equipped with a body (not shown), etc.

If such sleeve boxes for floor slab piping are buried in floor slab A in advance, piping can be easily installed from under the floor into the room, and even if you want to increase the number of pipes to multiple lines, you can install them individually in floor slab A each time. There is no need to drill holes, and even if pipes that are no longer needed are removed, there will be no holes left in the floor, making it easy to add, remove, or change pipes, and prevent the waterproofness of the floor from being compromised. Moreover, when not in use, there is a flat lid that is flush with the floor, which improves safety and provides many other benefits.

[Problem that the invention attempts to solve]

By the way, in the conventional sleeve box for floor slab piping described above, the sleeve 4 itself, which is screwed into each sleeve mounting hole 3 at the inner bottom of the box body 1, has a pipe joint structure. That is, the sleeve 4 has a structure in which a female threaded connection port 4b is formed at the lower end of the inner hole 4a and a male threaded connection port 4c is formed at the upper end. The upper end of the pipe is screwed from below, and the joint valve 5 or pipe joint 6 for connecting the upper pipe is screwed to the connection port 4c of the upper end.

Therefore, when piping is connected through such a sleeve 4, there are two threaded connection portions at the top and bottom of the sleeve 4, which increases the possibility of fluid leakage. In addition, the sleeve 4 is generally made of a cast product.
There is a risk of leakage due to defects in the casting itself, and furthermore, if vibrations such as earthquakes occur repeatedly, leakage due to loosening of the threaded connection becomes even more of a concern.

For this reason, in recent laboratories, medical rooms, etc., which tend to use floor slab piping sleeve boxes frequently, the types of fluids that need to be supplied have increased, and the number of piping for gases that are harmful to the human body has also increased. As a result, there have been strong calls for improvements to the leakage problem mentioned above.

[Means to solve the problem]

The sleeve box for floor slab piping of this invention is
In view of the above circumstances, and in order to improve the conventional problems, we have developed sleeves for various types of piping that are screwed into each sleeve mounting opening in the box body.
It has an inner hole through which the lower piping can be inserted from below upwards, and the upper end of the lower piping inserted from below upward through this inner hole is directly connected to the joint valve for connecting the upper piping, A packing having a wedge-shaped cross section is provided at the upper end of the sleeve and surrounding the outer periphery of the lower piping, and the packing is screwed into the upper end of the sleeve from the upper side so as to surround the outer periphery of the lower piping. It is characterized by being configured with a perforated cap-shaped tightening nut that is pressed against the surface.

[Effect]

With the above configuration, the joint valve for connecting the upper piping does not have to be connected to the upper end of the sleeve as in the past.
The lower piping is inserted into the inner hole of the sleeve from below to the top, and the upper end of the piping is connected directly to the joint valve, so there is only one threaded connection for the piping, and the fluid flow is reduced accordingly. There is less chance of leakage. Furthermore, since the lower pipe passes through the inner hole of the sleeve, the sleeve does not come into direct contact with the fluid, and there is no need to worry about leakage due to casting defects in the sleeve. In addition, the lower piping is tightened and held by a perforated cap-shaped tightening nut that fits into the upper end of the sleeve through a packing having a wedge-shaped cross section surrounding the outer periphery. The lower piping can be absorbed by the sleeve, is less affected by the vibration, prevents leakage due to loosening of the piping connection, and ensures a reliable seal between the lower piping and the sleeve.
This makes it possible to prevent fluid remaining inside the box body from leaking to the floor.

Furthermore, since the joint valve is not connected to the upper end of the sleeve, but is inserted through the inner hole of the sleeve and connected to the lower piping, the height of the joint valve and the lower piping can be arbitrarily selected. , the box can be stored at an appropriate height without protruding upward from inside the box body.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Components in the figure that are the same as those shown in FIG. 4 are given the same reference numerals to simplify the explanation.

Here, a plurality of sleeve attachment holes 13 are formed in the bottom plate 2 of the box body 1, which is made of cast iron or the like and is buried in the floor slab A and has a bottomed box shape with an open top. Sleeves 14 are individually removably screwed into B13 from above.
Each of the sleeves 14 has an inner hole 14a through which the lower pipe B can be inserted directly from below to the upper side, and has a simple form with a nut receiver 14b at the upper end of the inner hole 14a. A male thread is formed on the outer periphery, and the upper end surface is cut diagonally inward.

On the other hand, the joint valve (for example, a ball valve) 5 for connecting the upper pipe is connected to the sleeve 14 as in the conventional case.
Rather than being screwed to the upper end, it is configured to be directly screwed and connected to the upper end threaded portion b of the lower pipe B, which is inserted from below upward through the inner hole 14a of the sleeve 14.

Further, the nut receiving portion 1 at the upper end of the sleeve 14
A tightening nut 16 is screwed onto 4b from above with a packing 15 interposed therebetween. The tightening nut 16 has a hole in the shape of a cap through which the lower pipe B passes through the center, and the packing 15 has a wedge-shaped cross section so as to partially fit into the upper end face cut inwardly at an angle to the nut receiver 14b. The ring is a flexible ring made of rubber or the like, and is pressed against the outer peripheral surface of the lower pipe B by tightening the tightening nut 16.

In addition, if only the lower piping B is provided but there is no need for the upper piping for the time being, a cap 17 is fitted to the upper end of the lower piping B, and a conventional plug is inserted into the sleeve mounting hole 13 where no piping is required. The plug 7 is screwed together and closed.

Furthermore, 18 in the figure is a heat insulating material coated on the outer periphery of the lower pipe B.

Therefore, with the sleeve box for floor slab piping having the above configuration, if it is buried in the floor slab A in advance as in the conventional case, piping from under the floor to the room can be easily installed, and it is possible to increase the number of piping to multiple pipes. Even if the pipes are no longer needed, there is no need to drill holes in the floor slab A each time, and conversely, even if pipes that are no longer needed are removed, no holes remain in the floor, making it easy to increase, reduce, or change the pipes. .

Moreover, in the present invention, as mentioned above, the sleeve 1
4, the lower pipe B penetrates from below to the top, and the upper end of the pipe B directly connects to the joint valve 5, so there is only one threaded connection of the pipe, which reduces fluid leakage. There is little possibility of In addition, the lower pipe B is connected to the inner hole 14 of the sleeve 14.
Since the sleeve 14 penetrates through a, the sleeve 14 does not come into direct contact with the fluid, and there is no need to worry about leakage due to casting defects in the sleeve. Furthermore, the lower pipe B is tightened and held by a perforated cap-shaped tightening nut 16 that fits into the upper end of the sleeve 14 via a packing 15 with a wedge-shaped cross section surrounding the outer periphery, so that earthquakes etc. from the floor slab A are secured. The vibrations can be absorbed by the packing 15, so that it is less affected by the vibrations, and leakage due to loosening of the piping connection with the joint valve 5 can be prevented. At the same time, a gasket 15 is inserted between the lower pipe B and the sleeve 14.
As a result, the fluid remaining in the box body 1 can be reliably prevented from leaking down the floor via the surface of the lower pipe B.

Furthermore, without connecting the joint valve 5 to the upper end of the sleeve 14, the inner hole 14a of the sleeve 14 can be connected.
Since the joint valve 5 is inserted through the box body 1 and connected to the upper end of the lower pipe B, the height of the joint valve 5 can be arbitrarily selected together with the lower pipe B, and the height can be adjusted to an appropriate height without protruding upward from inside the box body 1. Due to the machining accuracy error and tightening torque of the tapered pipe thread between the sleeve mounting hole 3 and the sleeve 14, the threaded height of the sleeve 14 varies, and the joint This eliminates the problem of the valve 5 protruding over the box body 1 and providing support for closing the upper lid.

[Effect of idea]

Since the present invention is made as described above, the threaded connection of the piping can be made in one place, which reduces the possibility of fluid leakage, and the fluid does not come into direct contact with the sleeve, which can cause problems such as casting defects in the sleeve. There is no need to worry about leakage, and the packing can absorb vibrations such as earthquakes from the floor slab, so the pipes are less affected by the vibrations, preventing leaks due to loose pipe connections, and at the same time, the lower pipe and sleeve A reliable seal is formed between the box body and the fluid remaining in the box body can be prevented from leaking to the underfloor. In addition, the height of the joint valve can be arbitrarily selected along with the lower piping, and it can be placed at an appropriate height without protruding upward from the box body, which has the effect of improving the conventional problems. It will be done.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention; Figure 1 is a sectional view of the buried construction state, Figure 2 is an enlarged plan view of a portion of Figure 1, and Figure 3 is the same part. FIG. 4 is an enlarged cross-sectional view of a conventional example. 1...Box body, 2...Bottom plate, 5...Joint valve, 6...Pipe fitting, 7...Plug, 1
3...Sleeve mounting hole, 14...Sleeve, 1
4a... Inner hole, 14b... Nut receiver, 15...
Packing, 16...Tightening nut, A...Floor slab, B...Lower piping.

Claims (1)

[Scope of utility model registration request] A box body made of cast iron or the like buried in a floor slab is shaped like a bottomed box with an open top and has a plurality of sleeve attachment openings on the bottom plate, and each sleeve attachment opening in the box body has a In a sleeve box for floor slab piping, which is equipped with a sleeve for various types of piping that is screwed into the sleeve, the sleeve has an inner hole through which the lower piping can be inserted as it is from the bottom to the top; The upper end of the inserted lower piping is directly connected to the joint valve for connecting the upper piping, and a packing having a wedge-shaped cross section is provided at the upper end of the sleeve and surrounding the outer periphery of the lower piping. For floor slab piping, comprising a perforated cap-shaped tightening nut that is screwed into the upper end of the sleeve from above and presses the packing against the outer peripheral surface of the lower piping. Sleeve boxes.