JP4743417B2 - Water stop device and method for forming through hole - Google Patents

Description

  The present invention relates to a water stop device and a method for forming a through hole used when forming a through hole in a side wall of a concrete structure which is an underground structure and has stagnant water inside.

Conventionally, construction has been carried out to connect existing facilities such as treated water that can be discharged to the outside, such as sewage treated water, and other facilities by piping. In addition, it is intended to effectively use a part of the treated water on the other facility side. In such a case, it is necessary to form a through hole for connecting or passing the pipe at a position below the water level of the stagnant water on the side wall of the existing concrete structure.
For this reason, conventionally, the discharge of the treated water is temporarily stopped, and one space where the through hole on the concrete structure side faces is free of water, or a work space is obtained at the part where the through hole opens. As shown in the figure, a partition wall is formed around the partition wall, and water is drained from a portion surrounded by the partition wall.

However, it is impossible to interrupt the discharge of sewage effluent in an operating sewage effluent discharge basin, and it is difficult to install a work partition inside a box-type discharge basin. It is. Therefore, it is desired that a through-hole can be formed in the side wall of the sewage treated water discharge tub in operation.
From this situation, the present inventor attaches a water stop box by an underwater work by a diver in order to shut off water on the inner side where a through-hole will be opened in an operating sewage treatment water discharge basin. Considered to do so.
When working on an elevated surface part of the structure immersed in water or seawater, as shown in Patent Document 1, a box body whose upper surface and front surface are opened is suspended from above and is suspended on the elevated surface part. There is a method of draining water from the work space to which the box is attached.

As described above, even if the sewage treatment water discharge basin is in operation, if a water stop box similar to the box shown in Patent Document 1 is attached in advance to the portion where the through hole is opened, the external A through-hole can be formed at a required position by boring from the side, and when the through-hole is formed, water flows out to the outside only by the water in the water stop box. After the pipes are connected to the through holes and the pipe connection to the other facilities described above is completed, the stagnant water inside the concrete structure is poured into the water stop box, and the water stop box and the pipe are filled with water. At this point, the water stop box may be removed by underwater work performed by a diver.
However, since the upper surface is open, the upper end of the water stop box needs to protrude above the water surface, and when the water stop box is attached to a position where the water depth is deep, the water stop box has to be elongated in the vertical direction. In addition, since the installation of the water stop box is an underwater operation performed by a diver, there is a limitation in work time, and it is considered difficult to ensure installation accuracy (positioning surveying) and check the water stop state.
JP-A-62-253811

  Therefore, the present invention enables the water stop box to have the minimum necessary size corresponding to the through hole in underwater work and can be attached with high accuracy, and when opening the through hole, It is an object to make it easy to confirm whether or not the water stop box that should block the stagnant water on the inside side is properly stopped.

The present invention has been made in consideration of the above-mentioned problems. When a through hole is formed in a side wall of a concrete structure having water stagnating inside from the outside of the concrete structure to the height of water stagnating or less. A water stop device to be used, which is attached to the outer surface of the through hole opening planned portion of the side wall, and a core drill of a core boring for drilling a small-diameter leading hole can be inserted when opened, and the leading drilled by the core boring A plug body that stops water remaining when the hole is closed, and a connection opening having a size that covers the through hole opening planned portion on the mounting surface side, and has a guide rod that protrudes from the connection opening toward the side wall. A water stop box which is positioned and arranged on the inner surface of the through hole opening planned portion of the side wall by inserting a guide rod into the preceding hole, and the periphery of the connection opening covering the through hole opening planned portion is watertightly attached to the side wall. To prepare Provide waterproofing apparatus characterized, it is to solve the above problems.
In this invention, it is preferable that an open / close valve for discharging air and an open / close valve for inflowing stagnant water are provided on the outer surface of the water stop box.

  According to another aspect of the present invention, when a through hole is formed in a side wall of a concrete structure having a stagnant water at a height equal to or lower than the stagnant water from the outside of the concrete structure, the through hole opening of the side wall is formed. The stopper of the water stop device according to claim 1 is attached to the outer surface of the planned portion, a small diameter leading hole is drilled in the through hole opening planned portion through the plug when opened by core boring, and then the stopper is closed to make concrete Stop water from passing through the preceding hole from the inside of the structure, put the water stop box of the water stop device into the water of the concrete structure, and insert the guide rod of the water stop box into the preceding hole to plan the opening of the through hole The water stop box is positioned so as to cover the inner surface of the water stop, and the periphery of the connection opening that covers the planned opening of the through hole of the water stop box is watertightly attached to the side wall to block the flow of water into the water stop box. The through-hole opening planned portion A through hole is formed by core boring from the outside of the gate structure to form a through hole facing the waterstop box, and the method for forming the through hole is provided to eliminate the above-mentioned problem To do.

According to the first aspect of the present invention, the plug body only needs to have an inner diameter through which the core drill with the smallest diameter out of the sizes suitable for core boring the side wall of the concrete structure, and needs to be large. Absent. And since the opening and closing are not repeated frequently, it is only necessary to stop the stagnant water that begins to flow from the cored leading hole by pulling out the core drill, and then open it when necessary. It is possible to adopt existing ones such as those that are cheap and inexpensive, and those that are used for injecting chemicals. In addition, the water stop box itself has a simple shape that does not depend on the depth of water that is stagnant, and can be inexpensive. For example, when the box shown in Patent Document 1 is used as a means for blocking the stagnant water with respect to the planned through-hole opening under the surface of the stagnant water, the through-hole planned opening is deep as described above. The higher the position, the larger the box. On the other hand, the water stop box in the present invention may be of a size that covers the planned opening of the through hole, and is compact. Therefore, the whole water stop apparatus can be manufactured at low cost.
Furthermore, since the plug body is provided on the only outlet side of the water in the water stop box so that it can be opened and closed, the plug body closed after the drilling of the preceding hole is opened, and the leading body in the water stop box is opened. After draining up to the hole height, open the plug so that water flows from the outside of the water stop box into the water stop box (leakage state, whether water is completely shut off) Can be easily confirmed.
According to the invention of claim 2, after a pipe or the like is connected to the open through-hole, the diver opens the on-off valve for discharging air and opens the on-off valve for inflow of stagnant water underwater work. With a simple operation, water can be filled in the water stop box and the connected pipe, and the work of filling the water before removing the water stop box becomes easy.

According to the invention of claim 3, the water stop box is attached to the side wall of the concrete structure by the submersible underwater work, and the relationship between the inside and the outside of the water stop box is cut off. Even if it is treated water discharge dredging, it is not necessary to interrupt the discharge. In addition, even if sewage treatment water is discharged into the sewage treatment water discharge basin, the flow is not at a speed that impairs the underwater work of divers.
In addition, since the water stop box can be positioned by inserting the guide rod of the water stop box into the preceding hole, it is possible to omit the ink-out surveying for installing the water stop box in the stagnant water in the concrete structure. And since positioning is easy, attachment of a water stop box can be performed in a short time, when there are time restrictions in diving work.
In addition, if you open the plug after closing the preceding hole and drain the water when necessary, install the water stop box from the outside of the concrete structure, that is, from the side where the through hole is opened The situation (leakage condition, whether or not water is completely shut off) can be easily confirmed by the presence or absence of water flowing out from the plug after draining, safely opening the through hole, and after opening It will be possible to perform pipe piping work.

Next, the present invention will be described in detail based on the embodiment shown in FIGS.
(Water stop device)
In the figure, reference numeral 1 denotes a water stop device provided in a portion where a through hole is formed in the side wall of a concrete structure having a stagnant treated water such as sewage treated water. As shown in FIG. Is a plug body 2 arranged on the outer surface 15a side (outer surface side of the concrete structure) of a later-described through-hole opening planned portion 15 (see FIG. 2), and an inner surface 15b side of the through-hole opening planned portion 15 ( And a water stop box 3 arranged on the inner surface side of the concrete structure where water is always stagnant.

  As shown in FIG. 1, the plug body 2 includes a base metal fitting 4 fixed to a portion where the leading hole 19 is cored at the center of the through-hole opening planned portion 15 (the center of the pipe) and a ball cock connected to the base hardware 4. 5 and the inner passage can be opened and closed by an opening / closing operation with the ball cock 5. The plug body 2 has an inner diameter that allows a diamond core drill 18 (see FIG. 5) for core boring the leading hole 19 to pass through the ball cock 5 to reach the housing when opened.

The water stop box 3 is a box made of a steel plate having a connection opening 6 opened to a size that covers the through hole opening planned portion on the mounting surface side when the water stop box 3 is arranged on the side wall 14. And as shown in the figure, there is a flange 7 projecting outward around the periphery of the connection opening 6, and a waterproof rubber 8 is adhered to the mounting surface side of the flange 7, and the waterproof rubber A mounting bolt 7a on the surface opposite to the sticking surface 8 is provided so that it can be bolted to the anchor on the housing side through the flange 7 and the water-stopping rubber 8 when the water-stopping box 3 to be described later is attached.
Further, in the water stop box 3, as shown in FIG. 2, when the water stop box 3 is arranged so as to cover the through hole opening planned portion 15, it can be inserted into the preceding hole 19 at a position corresponding to the preceding hole 19. A guide bar 9 made of a reinforcing bar material having a thickness is provided, and in this embodiment, the intersection of the angle members 10 arranged in a cross at the inner side of the box at the center of the connection opening 6 It is provided in a state of protruding from the portion toward the housing.
On the back plate 11 opposite to the connection opening 6 of the water stop box 3, an open / close valve 12 for discharging air is attached to the upper side, and an open / close valve 13 for inflow of stagnant water is attached to the lower side, as will be described later. When the through hole 20 (see FIG. 9) is formed in the side wall 14 and the piping work is completed, the opening / closing valve 12 and the opening / closing valve 13 are opened and stopped by the underwater work of the diver from the outside of the water stop box 3. The water (sewage treatment water) outside the water stop box 3 can be drawn into the water stop box 3 and filled while the air is extracted from the water box 3. Note that the on-off valve 12 and the on-off valve 13 are both closed until this water drawing operation is performed.

(Through hole formation method)
Next, a method for forming a through hole using the water stop device 1 will be described.
・ Attachment of plug body As shown in FIG. 3, in the embodiment, in the pipe construction in which the existing sewage treated water discharge basin is made into a concrete structure and the pipe is connected to a facility located away from the sewage treated water discharge basin. The example which forms a through-hole is shown. Therefore, as a pre-stage of the piping work, the shaft 16 is excavated along the side wall 14, and the work space is located at a position corresponding to the through-hole opening planned portion 15 with respect to the continuous wall 17 formed before excavating the shaft 16. The outer surface 15a of the through-hole opening planned portion 15 appears as a part of the back surface of the work space.
As shown in FIG. 4, when a through hole is formed in a side wall 14 of a concrete structure having a sewage-treated water stagnant, a through hole is scheduled to be opened with respect to an outer surface 15 a of a through hole planned portion 15 of the side wall 14. The center position (center of the pipe) of the portion 15 is marked, and the base hardware 4 in the plug body 2 of the water stop device 1 is attached and fixed thereto, and the ball cock 5 is connected to form the plug body 2. The inner diameter of the inner passage of the plug body 2 is, for example, 40 mm.

・ Previous hole drilling After the plug body 2 is attached, as shown in FIG. 5, the plug body 2 is opened and the diamond core drill 18 is inserted to reach the housing of the side wall 14 until the side wall 14 is penetrated. Core boring is performed to obtain a cored leading hole 19. If the leading hole 19 penetrates through drilling by core boring in this way, the diamond core drill 18 is pulled out, and the plug body 2 is once closed to stop water. The inner diameter of the preceding hole 19 is, for example, 28 mm.
FIG. 6 shows an operation of cutting a portion to be an opening for hanging a water stop box with a wall saw and lifting it with a crane a in the top of a sewage treated water discharge basin as a concrete structure.

・ Installation of the water stop box Next, as shown in FIG. 7, the water stop box 3 is suspended and suspended by the crane a in the water of the concrete structure, and supported by the suspension support means b anchored in the concrete structure. A diver inserts the guide rod 9 of the water stop box 3 into the leading hole 19 already penetrating into the center position of the inner surface 15b of the through hole opening planned portion 15 of the side wall 14 by the underwater operation. In this state, the anchor is driven on the side wall 14 side corresponding to the bolt passing position in the flange 7 of the water stop box 3, and the flange 7 is bolted with the water stop rubber 8 interposed therebetween. The periphery of the connection opening 6 of the water box 3 is attached to the side wall 14 in a watertight manner. At that time, the surface of the side wall 14 in contact with the water blocking rubber 8 is cleaned in advance and smoothed. In addition, it is also possible to fill the sealing material along the periphery of the bolt or the flange 7 to further increase the water density. In the figure, c is a step for raising and lowering the diver.
When the installation of the water stop box 3 is completed, the plug body 2 is opened as shown in FIG. 8 to drain water d from the water stop box 3 to the height of the preceding hole. It is confirmed whether or not the flow of water from the plug body 2 continues after the drainage. That is, whether or not water flows from the outside of the water stop box 3 into the water stop box 3 is confirmed. In addition, what is necessary is just to fill a sealing material around a flange and a bolt circumference by a diver when the flow into the water stop box 3 is confirmed.

-Side wall penetration After confirming that there is no water leakage state in which water flows into the water stop box 3 as described above, the plug body 2 is removed. Thereafter, as shown in FIGS. 9 and 10, continuous core boring is performed around the through-hole opening planned portion 15 to form a through-hole 20 through which piping can be passed. For example, when obtaining a through hole having a diameter of about 700 mm, the core boring having a diameter of 160 mm can be continuously continued along the periphery of the through-hole opening planned portion 15 as the continuous core boring, but the limitation is particularly limited. Is not to be done.

  After the through hole 20 is formed in this way, piping work is performed between the concrete structure and another facility, and the gap between the through hole 20 and the pipe is filled with concrete to close the pipe connection. What is necessary is just to remove the water stop box 3 at the time of complete | finishing. When removing the water stop box 3, the diving person underwater works to open the open / close valve 12 and the open / close valve 13 of the water stop box 3 to flow the water from the water stop box 3 to the pipe side. It will be removed from the side wall 14.

Although the said plug body 2 was demonstrated as what connected the ball cock 5 to the base metal object 4, it is not limited to this. For example, you may comprise this plug body 2 as a pre-bender utilized when inject | pouring a chemical | medical solution into the soil of the back part of a concrete wall. In this case, as shown in FIG. 11, the packer 23 having a structure including a rod hole portion 21 into which the rod is inserted and a discharge portion 22 that discharges the fluid that circulates around the inner peripheral surface of the rod hole portion 21. What is necessary is just to further connect with respect to the ball cock 5. FIG. In this way, when the diamond core drill is pulled out after passing through the preceding hole, the flow of water can be guided to an appropriate discharge path.
Moreover, although the example which forms a through-hole in the side wall of a sewage treated-water discharge basin was shown as embodiment, this invention is not limited to this, What is the side wall of a concrete structure with a stagnant water inside? The present invention can be implemented.

It is explanatory drawing which shows an example of the water stop apparatus which concerns on this invention. It is explanatory drawing which shows the water stop box in a water stop apparatus in the state of a cross section. It is explanatory drawing which shows the chipping work of the continuous wall in the front | former stage of piping construction. It is explanatory drawing which shows the state which attached the stopper of the water stop apparatus in an example of the formation method of the through-hole in this invention. It is explanatory drawing which shows the core boring of a preceding hole. It is explanatory drawing which similarly shows the core boring of a preceding hole. It is explanatory drawing which shows attachment of the water stop box by underwater work. It is explanatory drawing which shows the drainage from the water stop box attached to the through-hole opening plan part. It is explanatory drawing which shows continuous core boring. It is explanatory drawing which similarly shows continuous core boring. It is explanatory drawing which shows the state which made the plug body the prebender type | mold at the time of core boring of a preceding hole.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Water stop apparatus 2 ... Plug body 3 ... Water stop box 5 ... Ball cock 6 ... Connection opening 9 ... Guide rod 14 ... Side wall 15 ... Through-hole opening planned part 15a ... Outer surface of through-hole opening planned part 19 ... Leading hole 20 ... Through hole 23 ... Packer

Claims (3)

A water stop device used when forming a through-hole in the side wall of a concrete structure having water stagnant therein, from the outside of the concrete structure to the water stagnating height or less,
A core drill of a core boring, which is attached to the outer surface of the through-hole opening planned portion of the side wall and drills a small-diameter leading hole, can be inserted when opened, and stops stagnant from the preceding hole drilled by the core boring when closed. A watering plug,
The mounting surface side is a connection opening having a size that covers the planned opening portion of the through hole, and has a guide bar protruding from the connection opening toward the side wall. By inserting the guide bar into the preceding hole, the side wall is penetrated. A water stop device, comprising: a water stop box positioned and arranged on the inner surface of the hole opening planned portion and having the periphery of the connection opening covering the through hole opening planned portion attached to the side wall in a watertight manner.   The water stop device according to claim 1, wherein an open / close valve for discharging air and an open / close valve for inflowing stagnant water are provided on an outer surface of the water stop box. In forming a through-hole in the side wall of a concrete structure having stagnant water from the outside of the concrete structure below the stagnant water height,
The stopper of the water stop device of claim 1 is attached to the outer surface of the through hole opening planned portion of the side wall,
After drilling a small-diameter leading hole in the through-hole opening planned portion through the plug body at the time of opening by core boring, the plug body is closed to stop water from passing through the leading hole from within the concrete structure,
The water stop box of the water stop device is placed in the stagnant water of a concrete structure, the water stop box guide rod is inserted into the preceding hole, and the water stop box is positioned so as to cover the inner surface of the through-hole opening planned portion,
The periphery of the connection opening covering the through-hole opening planned portion of the water stop box is watertightly attached to the side wall, blocking the flow of water into the water stop box,
A through-hole forming method, wherein the through-hole opening planned portion is core-bored from the outside of the concrete structure to form a through-hole facing the waterstop box.

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