JP3375596B2 - Concrete box construction method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a concrete box such as a handhole used for burying electric wires and telephone lines, and more particularly to a structure for draining water.

[0002]

2. Description of the Related Art FIG. 7 shows a handhole 10 used for burying an electric wire, a telephone wire or the like in the ground. The handhole 10 is buried in the ground 1, and a buried conduit 40 for laying an electric wire is connected to the side surface 11. In order to lay an electric wire in the buried conduit 40, the handhole 10 is buried at a predetermined distance on the burying line of the wire or at a corner portion of each burying line. After the electric wires are laid, they also function as an inspection port for conducting regular inspections of electric wires and the like.

There are various shapes of the handhole 10, such as a rectangular shape and a cylindrical shape, and the electric wire exposed from the conduit 40 into the handhole 10 is filled with water,
In order to prevent dust and the like from adhering, a handhole 10 having a bottom surface is often used. Then, on the side surface, in order that the conduit 40 or the like may easily penetrate therethrough,
In many cases, a thin hole punching portion 13 is prepared. Figure 8
A cross section of a general handhole 10 is shown in FIG. This hand hole 10 is a rectangular hand hole 10 as shown in FIG. 7, has a bottom surface 12, and a side surface 11 has
A thin perforated portion 13 is configured. And the bottom surface 1
Depending on the size of the handhole 10, depending on the size of the handhole 10, a hand can be put to lay an electric wire on the upper surface facing the
The entrance 14 is prepared so that humans can enter.

A problem with the handhole 10 having such a bottom surface 12 is the relationship with groundwater. The bottom surface 12 is prepared in order to prevent water from entering, but when the groundwater level 2 is lower than the burying level of the handhole 10, the bottom surface 12 is discharged to drain rainwater leaking from the entrance 14. It is desirable to prepare a hole for drainage. On the other hand, if the groundwater level 2 is at the same level as or higher than that of the handhole 10, it is impossible to prepare a hole for drainage in order to prevent the intrusion of groundwater. In order to cope with such a condition, the shape of the bottom surface of the handhole 10 may be changed to have a drain port or not have a drain port depending on the groundwater level. However, as the manufacturing cost increases and ordering and inventory management become complicated, as shown in FIG.
Is also provided, and a hole for drainage is required when the hole for drainage is required, the part 15 is broken to form a hole for drainage.

[0005]

However, even with such a handhole that can cope with high and low groundwater levels, there is a problem in management in the stockyard, especially in the case of open storage. That is, such a handhole is precast in concrete or the like in a factory or on-site in a required quantity prior to the burying process. Therefore, the manufactured handhole is often stored in an open field until it is transported to the site or buried.
Then, if it rains during this storage, water will accumulate in the handhole, and this drainage becomes a problem. Although the weight of the handhole itself is irrelevant, since the capacity of the handhole is large,
It is difficult to handle a handhole with water inside, and large heavy equipment may be required. It is not easy to pump out the water accumulated inside. Although it is possible to break through a thin part and drain water and then repair and bury it, it is easy for water to enter along the repaired part of the concrete and the water stopping ability after burying often decreases. . In addition, it may rain again during such repairs.

In view of the above problems, the present invention has an object to provide a concrete box such as a handhole which can be drained during storage and transportation and can be stopped when buried. There is.

[0007]

In order to solve the above problems, in the present invention, a pipe is buried in the bottom of a concrete box during precasting. That is, in the present invention, when precasting a concrete box having a bottom and a cylindrical side surface surrounding the bottom, at least one water-stoppable pipe is buried so as to penetrate the bottom, and the pipe is The concrete box is stored and / or transported so as to serve as a drainage port, and the pipe is stopped when the concrete box is buried.
If a pipe joint is buried as a pipe, water can be stopped by installing a water stopcock.

[0008]

[Operation] By providing a drainage port at the bottom during precasting, water will not collect inside the concrete box even if it rains during storage. For this reason, it is not necessary to avoid rain and store indoors, and they may be stored in the open field. In addition, even when the product is transported laterally thereafter, there is no problem such as an increase in weight due to the accumulation of rainwater inside the concrete box.

Furthermore, the drainage port for storage, etc., secured by burying a pipe joint at the bottom of the concrete box, has a high groundwater level. Water can be completely prevented by the simple method of installing a water stopcock in the joint.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a handhole 1 in this embodiment.
The structure of 0 is partially omitted. Similar to the conventional handhole described above, the handhole 10 of the present example has a cylindrical side surface 11 formed of four substantially rectangular surfaces around a substantially square bottom surface 12 and faces the bottom surface 12. An entrance 14 is prepared on the upper surface. In addition, at the lower part of the side surface 11, a thin hole punching portion 13 for installing a conduit or the like is prepared. In the handhole 10 of the present example, a circular drainage portion 16 which is slightly lowered to improve drainage is formed at approximately the center of the bottom surface 12. Then, as shown in FIG. 2, a socket joint 20 made of vinyl chloride is embedded in the center thereof to form a drainage port. Therefore, in the handhole 10 of the present example, since the drainage port is prepared at the time of manufacturing, even if it rains during storage, water does not collect inside the handhole 10. Therefore, it is not necessary to avoid rain and store indoors,
Also, even if you leave it open, you can hold it horizontally later.
There is no problem such as an increase in weight due to the accumulation of rainwater inside the handhole 10.

FIG. 3 is an enlarged view of the buried portion of the socket joint 20. In the handhole 10 of this example, a cylindrical socket 20 having a substantially convex cross section is used.
However, it is buried so that the wider connection port 21 faces downward, that is, facing the outside of the handhole 10. And
When the handhole 10 is buried in a place where the groundwater level is high, etc., when water stoppage is required, a blind plug 25 is inserted into this connection port 21 and bonded, or welded using a PVC welding machine or the like By this, it is possible to join them, and it is possible to completely stop the water.

Further, in this embodiment, since the socket-like joints 20 having different diameters are set so that the wider connection port 21 faces downward and the blind plug 25 is set in the connection port 21, it is waterproofed by the pressure of groundwater. In addition, a completely self-tight structure has been realized. That is, the handhole 10
When is buried in the ground where the groundwater level is high, the pressure of the groundwater is exerted on the bottom surface 12 of the handhole 10 from below to above. Therefore, the blind plug 25 is pressed from below toward the socket 20. Therefore, the connection portion between the socket 20 and the blind plug 25 is more firmly connected, and water can be prevented from entering from this portion.

FIGS. 4 and 5 show the handhole 1 of this example.
It is shown that 0 is buried. First, FIG. 4 shows an installation method when the groundwater level 2 is lower than the buried level of the handhole 10. The handhole 10 is installed on the upper part of the basic concrete (level concrete) 30 which raises the burial level, and the periphery thereof is backfilled with the soil 1 and buried. And when the groundwater level 2 is low, the entrance 14
It is desirable to drain rainwater, etc. that invades from below from below. Therefore, in this example, a perforated vinyl chloride pipe 31 having a plurality of holes on its side surface is connected to the socket 20 buried in the bottom surface 12. Then, the perforated vinyl chloride pipe 31 is guided to the infiltration base 32 made of crushed stone or the like. Therefore, the water that has entered the inside of the handhole 10 can be discharged from the socket 20 through the perforated vinyl chloride pipe 31 to the underground 1 from the infiltration foundation 32. Even when the groundwater level is low as described above, in the handhole 10 of this example, the socket joint 20 is embedded in the bottom surface 12, so that the perforated vinyl chloride pipe 31 can be easily connected. On the other hand, in the conventional hand hole in which the socket 20 is not embedded, a hole is opened on the bottom surface,
A perforated vinyl chloride pipe 31 must be installed there. Since it is impossible to make a cylindrical hole corresponding to the perforated vinyl chloride pipe 31 in the concrete,
After the perforated vinyl chloride pipe 31 is installed, sealing must be performed with mortar or the like, which is a troublesome work.

FIG. 5 shows a case where the handhole 10 of this example is buried in the ground where the groundwater level 2 is high. Even in this case, the level concrete 30 that gives the set level
The handhole 10 is set on the top, and the surrounding area is backfilled with the soil 1. Since the groundwater level 2 is at the same level as the handhole 10 or at a high level, the socket 20 is provided with a blind plug 2 in order to avoid intrusion of groundwater from the drainage port.
5 is inserted.

In the present embodiment, a vinyl chloride socket is used as the socket 20, and correspondingly, the vinyl chloride blind plug can be used as the blind plug 25. Therefore, an adhesive may be used to connect the socket 20 and the blind plug 25, or welding or the like may be performed. Furthermore, when the groundwater level is not so high, it is possible to obtain the water-stopping effect simply by inserting the blind plug 25. And, as described above, of course, a self-tight structure can be obtained by adjusting the connection surface. Thus, by using the resin socket such as vinyl chloride, the blind plug and the drainage pipe can be easily connected. It is also possible to prevent the generation of rust due to groundwater or water in the ground.

FIG. 6 shows a mold 35 for manufacturing the handhole 10 of this example. The formwork 35 of this example includes an inner formwork 36 that defines the inner surface of the handhole 10 and an outer formwork 37 that defines the outer surface. Then, the handhole 10 can be manufactured by pouring concrete 39 into the concrete application space set by the inner surface form 36 and the outer surface form 37. Also,
In the inner surface form 36 of this example, a protrusion 38 for setting the socket 20 is prepared at a position defining the bottom surface of the handhole 10. Therefore, when the concrete 39 is poured, by setting the socket 20 on the protrusion 38, the socket 20 can be embedded at a predetermined position of the handhole 10.

Although the present embodiment has been described based on a rectangular handhole, if the handhole has a bottom surface such as a cylindrical handhole, the above effect can be obtained by burying the joint. It is possible. Further, the joint is not limited to the socket, and of course, a joint such as a screw or a flange can be used. The number of joints to be buried can be freely selected depending on the size of the handhole and the like. Further, the present invention is not limited to laying a buried conduit such as a handhole, but can be applied to all precast buried boxes such as an inspection chamber for inspecting a ground wire.

[0019]

As described above, in the concrete box such as the handhole according to the present invention, the pipe is buried in the bottom portion thereof to form the drainage port for storage. Therefore, it is possible to prevent the trouble that rainwater or the like collects inside the box and becomes difficult to hold horizontally. And the pipe embedded in the bottom part can easily and completely stop the water with a water stopcock, etc., so that the water leakage can be easily prevented even when the box is buried in the ground with a high groundwater level. be able to.

As described above, the concrete box according to the present invention can be stored without worrying about rain, and can flexibly cope with high and low groundwater levels, so that storage, ordering, etc. can be managed. Will be easier. And since the water stoppage work can be reliably performed in a short time,
It is possible to shorten the process of setting the concrete box, and at the same time, it is possible to perform highly reliable construction against water leakage.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a hand hole according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of the handhole shown in FIG.

FIG. 3 is an enlarged view showing a structure of a drainage part of the handhole shown in FIG.

FIG. 4 is a cross-sectional view showing how the handhole according to the present embodiment is buried in the ground having a low groundwater level.

FIG. 5 is a cross-sectional view showing how the handhole according to the present embodiment is buried in the ground having a high groundwater level.

FIG. 6 is a cross-sectional view showing the structure of a mold for manufacturing a handhole according to this embodiment.

FIG. 7 is a perspective view showing a state in which a conventional handhole is buried.

8 is a sectional view showing the structure of the handhole shown in FIG.

[Explanation of symbols]

1 ... Ground 2 ... Groundwater level 10-Hand hole 11 ... Side 12 ... Bottom 13 ... Drilling part 14 ... Entrance 15 ... Thin wall 16 ... Drainage section 20 ... Socket joint 21 ... Wide mouth of socket joint 25 ... Blind plug 30: Level concrete 31: Perforated piping 32 ... Penetration basis 35 ... Formwork 36 ... Internal formwork 37 ... External formwork 38: Protrusion for socket setting 39 ... Concrete 40 ... Conduit

Claims (4)

(57) [Claims] 1. When precasting a concrete box having a bottom and a cylindrical side surface surrounding the bottom, at least one water-stoppable pipe is buried so as to penetrate the bottom, and the pipe is A method for constructing a concrete box in which the concrete box is stored and / or transported so as to serve as a drainage port, and the pipe is stopped when the concrete box is buried. 2. The method for constructing a concrete box according to claim 1, wherein the pipe is a pipe joint, and a water stop plug is installed in the pipe joint when the concrete box is buried. 3. When precasting a concrete box having a bottom and a cylindrical side surface surrounding the bottom, at least one water-stoppable pipe is buried so as to penetrate the bottom, and the pipe is A method for storing a concrete box in which the concrete box is stored so as to serve as a drainage port. 4. When precasting a concrete box having a bottom and a cylindrical side surface surrounding the bottom, at least one water-stoppable pipe is buried so as to penetrate the bottom, and the pipe is A method of transporting a concrete box in which the concrete box is transported so as to serve as a drainage port.