JPH0412778B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

This invention mainly relates to a leg drainage joint for a two-layer pipe that serves as a drainage route and a ventilation route for connecting a drainage horizontal main pipe to the base of a drainage standpipe in a two-layer standpipe system in a drainage standpipe system for high-rise and super high-rise buildings. Regarding.

[Prior Art] This type of conventional piping connects the horizontal drainage main pipe to the base of a single drainage standpipe via a small or large bend pipe, and as much as possible, drains water from the drainage standpipe to the above drainage pipe. Drainage piping is installed so that it flows smoothly into the horizontal main pipe, and air is supplemented as the air layer increases and decreases for drainage, and a state close to atmospheric pressure is always maintained to ensure that each appliance connected to the horizontal branch pipe In order to prevent drainage traps from breaking and to ensure a smooth flow of drainage, piping systems such as a separate three-pipe system with ventilation pipes and a combined two-pipe system are adopted, especially at the bottom of apartment buildings. In the case of multistory dwelling units, it is normal to connect a residential drainage side branch pipe to the side drainage main pipe. In addition, these are mainly intended for residential units in apartment complexes or guest rooms in hotels, etc., and so-called special drainage joints are used at the joints and bases of drainage standpipes, appliance drainage pipes, or drainage horizontal branch pipes. ,
There are also various combined one-pipe systems that do not require ventilation standpipes. In these conventional piping systems, the sewage flowing from the drainage standpipe falls from the bend pipe toward the bottom surface of the horizontal main drainage pipe along the inner curved surface of the bent pipe. A water film is formed that blocks the cross section. On the other hand, the drainage water flowing down the drainage standpipe along the inner and outer curved surfaces of the bent pipe moves over the bottom surface of the horizontal drainage main pipe, so it collides with the drainage water falling toward the bottom surface of the pipe. Plug and water splash phenomena occur in the bend pipe and the above-mentioned horizontal drainage main pipe. Such drainage characteristics, plugs, and water jumping phenomenon cause the pipe cross section of the horizontal main drainage pipe to be blocked as described above, and are a major factor in fluctuations in the pressure inside the pipe and generation of noise. Therefore, in piping systems such as the above-mentioned branch type three-pipe system and combined type two-pipe system, as shown in Figs.
In addition to connecting the bend pipe 3 through the pipe, a ventilation standpipe 4 is also installed, or in the case of a combined one-pipe system, an intermediate joint with a special structure such as a baffle plate or a blade inside the joint, or a side drainage main pipe and a leg. The leg joints are connected with relief vent pipes, 45° x 2 bends, 3D large bends, and horn-shaped leg drainage joints with large diameters.

[Problem that the invention attempts to solve]

However, in these conventional three-pipe drainage standpipe systems and two-pipe combined drainage system, when the wastewater from the drainage horizontal branch pipes (not shown) on each floor flows into the drainage standpipe 1, The flow becomes turbulent, and furthermore, a water film M is formed on the inner peripheral surfaces of the drainage standpipe 1 and the joint 2, and on the outer inner curved surface of the bend pipe 3, and due to this, as shown in FIG. , the bend pipe 3
Due to the occurrence of a stopper and water splash phenomenon S within the
As shown in Figure 4, large pressure fluctuations occur within the pipe, which not only obstructs the flow of ventilation inside the pipe, but also
Not only can drainage not be carried out smoothly, it also generates noise such as the sound of drainage. In addition, it is necessary to install a ventilation standpipe 4 in addition to the drainage standpipe 1, and in the case of a drainage side branch pipe, the connection structure with the connecting ventilation pipe circuit ventilation pipe etc. is complicated, and the piping work is complicated. It is extremely troublesome. In addition, special fittings or cleaning hardware must be installed in the piping for test work such as full-water tests and for clogging with oil deposits and foreign substances contained in wastewater, and testing work requires considerable time and effort. He was stiff. Therefore, not only does piping construction work require a considerable amount of time and expense, but also a large piping space is required, making construction and installation in a narrow space extremely difficult. There is also a combined one-pipe system that uses special joints for intermediate drainage joints and leg drainage joints, but in this case,
In general, if the special structure inside the joint becomes an obstacle and becomes clogged with solid matter, or if a plug or a vent pipe is installed to prevent water splashing, to supplement performance. Its performance depends on a special structure, and its function cannot be adequately fulfilled by replacing it with a ventilation standpipe or the like. Therefore, its use is generally limited to apartment buildings, hotels, etc., and cannot be applied to other building uses. This invention was made to solve the above problems, and is essentially a drainage joint structure adopted in a two-layer drainage standpipe system, which prevents the plug and splash of water flowing down from the drainage standpipe. Moreover, it can be reliably prevented, the drainage noise can be reduced, the ventilation function to the drainage standpipe and the horizontal drainage main pipe can be fully satisfied, and the drainage from the drainage vertical pipe can be smoothly flowed down to the horizontal drainage main pipe. The object of the present invention is to provide a leg drainage joint for a double-layer pipe that allows easy testing, maintenance, and inspection work.

[Means to solve the problem]

The leg drainage joint for a double-layer pipe according to the present invention has an upper end wall to which the inner pipe is opened and connected to the base of the drainage standpipe, one large diameter part is connected to the upper end wall, and the other small diameter part is connected to the upper end wall. A cylindrical bend pipe section connected to the horizontal drainage main pipe and formed with a curve that gradually reduces from the large diameter section, and a ventilation slit that communicates the bend pipe section formed on the upper end wall with the ventilation pipe of the drainage standpipe. It is equipped with the following.

[Effect]

Although the leg drainage joint for a double-layer pipe of the present invention is incorporated into the base of a drainage standpipe having a double-layer pipe structure and connects the drainage standpipe and a horizontal main drainage pipe, it is substantially a one-pipe system. It constitutes a drainage standpipe system. However, as with the joints of the drain standpipe and the drain horizontal main pipe, sufficient ventilation is achieved by communicating the drainage path with the ventilation path formed by the outer pipe and the inner pipe. In addition, the phenomenon of plugging and splashing that occurs when drainage water flows down is reliably prevented, drainage noise is reduced, and test work and maintenance inspection work can be easily performed.

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIGS. 1 and 2 are cross-sectional views of a leg drainage joint portion for a two-layer pipe showing an embodiment of a drainage standpipe system applied to drainage equipment of a high-rise apartment building. In the figure, the drainage standpipe 10 has a two-layer pipe structure consisting of an inner pipe 11 that forms a drainage path A within the pipe, and an outer pipe 12 that forms a ventilation path B between the outer peripheral surface of the inner pipe 11. It's summery. Reference numeral 13 denotes a leg drainage joint for a two-layer pipe that connects the base (leg) of the drainage standpipe 10 and the horizontal main drainage pipe 14. This two-layer pipe leg drainage joint 13 has an upper end wall 15 provided at the upper large diameter part 13b of the bend pipe part 13a, and a cylindrical lower small diameter part which is gradually contracted and curved from the large diameter part 13b. Drainage horizontal main pipe 14 to 13c
is connected. The upper end wall 15 is formed to have a larger diameter than the drain standpipe 10, and is provided with a foam backflow prevention plate 26 and an outer pipe connection socket 18. Further, the lower end side of the outer pipe 12 of the drainage standpipe is connected to the outer pipe connection socket 18. Note that the outer pipe connection socket 18 in the illustrated example is formed in the shape of a rattle whose diameter gradually increases on the lower end side.
The outer tube 12 is made of a cylindrical tube and is connected to the outer tube 12 through another joint.
may be connected. The upper end wall 15 has the outer pipe connection socket 18.
A ventilation slit 22 is provided which communicates with the ventilation path B through the inside. This ventilation slit 22 is connected to the drainage standpipe 10.
This is to ensure the required amount of air in response to the atmospheric pressure fluctuations that occur inside the tank. In this way, the leg drainage joint 13 for two-layer pipe has the following features:
The drainage horizontal main pipe 14 is connected to the drainage standpipe 10 continuously to the ventilation path B. Next, the effect will be explained. Inner pipe 11 of drainage standpipe 10
While maintaining a continuous flow from the drainage standpipe 10, the inflowing wastewater flows down into the large-diameter inner pipe of the bent pipe section 13a connected to the ventilation path B, and flows along the inner circumferential wall that is gradually reduced. Then, it moves to the drainage horizontal main pipe 14. As a result, plugs and splashing phenomena are avoided, and a laminar flow state is maintained up to the drain horizontal main pipe 14, so that the water is discharged out of the system in a smooth flow. On the other hand, in terms of ventilation, the positive pressure air separated at the bend pipe section 13a from the wastewater flowing down in the drainage standpipe 10 is transferred through the ventilation slit 22 between the outer pipe 12 and the inner pipe 11. It quickly escapes to the formed ventilation path B, avoids the occurrence of abnormally rising pressure inside the pipe, and reduces the width of pressure fluctuation (±25 mm underwater). In addition, a foam backflow prevention plate 26 is provided at a lower position of the ventilation slit 22 in the double-layer pipe leg drainage joint 13, so that the detergent-containing wastewater foam generated due to the flow characteristics of the wastewater flows into the ventilation path B. The ventilation path B by the bubbles is prevented from backflowing.
This prevents blockage.

【Effect of the invention】

As described above, according to the present invention, by incorporating the two-layer pipe leg drainage joint into the base of the two-layer drainage standpipe, the drainage water from the drainage standpipe gradually flows into the large diameter inner pipe of the bent pipe section. It flows along the reduced inner peripheral wall, separating water and air, and creating an air layer in the inflow drainage that leads to the ventilation path inside the leg drainage joint for two-layer pipes, increasing the ventilation effect of the system. In addition to maximizing the ventilation effect of the entire system, it is also possible to provide a highly functional drainage system that is more expensive than a single-pipe system. In particular, it prevents unpleasant noises that occur when draining water,
The pressure inside the pipe can be maintained at atmospheric pressure, which protects the water seal and prevents odor from being emitted or released due to breakage of the trap seal, and also has no effect on detergent drainage. By transporting wastewater quickly and smoothly, complaints from low-rise residents in apartment complexes can be completely addressed. In addition, in terms of overall functions, it has high sound insulation properties, does not require heat insulation, improves workability and maintenance management, and can penetrate fireproof compartments and absorb expansion and contraction of pipes due to heated drainage. This system does not generate any expansion/contraction noise, and is also highly economical.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a leg drainage joint for a two-layer pipe in a two-layer standpipe system according to an embodiment of the present invention, Fig. 2 is a plan view, and Fig. 3 is a conventional two-pipe drainage standpipe. FIG. 4 is a sectional view showing the flow of drainage at the base of the drainage standpipe in the system, and FIG. 4 is a sectional view showing the flow of positive pressure air at the base of the drainage standpipe. In the figure, 10 is a drainage standpipe, 11 is an inner pipe, 1
2 is an outer pipe, 13 is a two-layer pipe leg drainage joint, 13a
14 is a horizontal drainage pipe, 15 is an upper end wall, 22 is a ventilation slit, 26 is a foam backflow prevention plate, A is a drainage path, and B is a ventilation path.

Claims (1)

[Scope of Claims] 1. A drainage standpipe composed of a two-layered pipe consisting of an inner pipe with a drainage path inside the pipe and an outer pipe that forms a ventilation path with the outer peripheral surface of the inner pipe, and this drainage standpipe. In a leg drainage joint for a two-layer pipe that connects a horizontal main drainage pipe to the base of a standpipe, the upper end wall is connected to the base of the drainage standpipe through an opening of the inner pipe, and one large diameter section is connected to the upper end wall. a cylindrical bend pipe section, the other small diameter section of which is connected to the drainage horizontal main pipe, the bend pipe section being formed with a gradually decreasing curve from the large diameter section, the bend pipe section formed on the upper end wall, and the ventilation path. A leg drainage joint for a two-layer pipe, characterized by comprising a ventilation slit communicating with the two-layer pipe. 2. The leg drainage joint for a two-layer pipe according to claim 1, further comprising a foam backflow prevention plate provided below the ventilation slit to prevent foam in drainage from flowing back into the ventilation path.