JPS6118077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for ensuring water-stopping properties of joints of concrete pipes that are connected underwater, and in particular, to a method for significantly improving water-stopping properties and confirming the completeness of water-stopping. Regarding how to facilitate.

Conventionally, in order to ensure the water-tightness of a joint of an underwater concrete pipe, a rubber gasket 5 was placed between the outer periphery of the insertion part 2 of the male pipe 1 and the inner periphery of the receiving part 4 of the female pipe 3, as shown in FIG. A method is adopted in which the gap between the male tube 1 and the female tube 3 is closed by attaching the tube.

However, this method causes the following problems. That is, since the connection between the male tube 1 and the female tube 3 is an underwater operation, the rubber gasket 5 becomes an obstacle, making it difficult to insert the male tube 1. Furthermore, if enough room is left in the rubber gasket 5 for insertion of the male tube 1, the water-tightness will be insufficient. Furthermore, it is not possible to confirm the completeness of the water stop.

The present invention has been made based on these conventional problems, and provides a stop that facilitates pipe connection work, improves water stop performance, and also makes it easy to confirm the completeness of water stop. Aims to provide water method.

The gist of the method of the present invention is to place a plurality of annular rubber tubes in a depressurized state at a distance from each other in advance on the inner periphery of the receiving part of the female tube, and after inserting the insertion part of the male tube into the inside of the rubber tube, each rubber tube is The pressure is increased to close the gap between the male tube and the female tube, and outside air is sucked in between the rubber tubes in the increased pressure state, and water is detected in the outside air to ensure water-stopping properties. After confirmation, a hydration reaction type curing agent is injected instead of the outside air and filled between each rubber tube.

The present invention will be explained below with reference to embodiments shown in FIGS. 2 to 5.

2 and 3 show an embodiment of a water stop device for carrying out the method of the present invention, and this device includes a male pipe 11
, a female tube 14 having a receiving section 13 into which the insertion section 12 of the male tube 11 is inserted, and a plurality of annular rubber tubes 15 and 16 arranged at a distance from each other on the inner periphery of the receiving section 13 of the female tube 14. , each rubber tube 1
Feeding means 17, 1 for enclosing pressure increasing substance in 5, 16
8.

The rubber tubes 15 and 16 are under reduced pressure before the male tube 11 is combined with the female tube 14,
The insertion portion 12 of the male tube 11 has an inner diameter larger than the outer diameter. In addition, male and female tubes 1
When combining 1 and 14, each rubber tube 1
After the insertion part 12 of the male tube 11 is inserted inside the tubes 5 and 16, each rubber tube 15 and 16 is put into an increased pressure state to close the gap between the insertion part 12 and the receiving part 13 in the male and female tubes 11 and 14. Block it and stop the water.

On the other hand, the feeding means 17 and 18 each have a female pipe 1
The rubber tube 15,1 passes through the receiving part 13 of 4.
6 and having a desired check valve in the middle, and filling each rubber tube with a pressure increasing substance such as outside air or a fluid rubber-like substance (not shown) through each feeding pipe 19, 20. It consists of a pump.

Furthermore, after removing the water left in the space 21 between the pressure-increased rubber tubes 15 and 16, if outside air is allowed to pass through, the completeness of the water stop is confirmed by the presence or absence of moisture mixed in the outside air. Therefore, the female pipe 14 is provided with a second feeding means 22 that extracts the water remaining in the space 21 and fills it with outside air. The second feeding means 22 includes a feeding pipe 23 that passes through the receiving portion 13 of the female pipe 14 and is connected to the space 21 and has a desired check valve in the middle, and feeds outside air into the feeding pipe 23. It consists of a pump (not shown) and a water detection section (not shown), and water in the space 21 can be pushed out by pressure when outside air is sent through the feed pipe 23.

Furthermore, if water intrusion into the space 21 is confirmed by the second feeding means 22, or regardless of the presence or absence of water intrusion, the space 21 may be filled with a hydration-reactive hardening agent after removing water. , water-tightness is ensured.
Therefore, the female pipe 14 may be provided with a hardening agent feeding means for feeding the hardening agent into the space 21, or the second feeding means 22 may also serve as the feeding of the hardening agent. good.

In order to carry out the water stop method using the water stop device configured as described above, as shown in FIG. Then insert the insertion portion 12 of the male tube 11 into the rubber tubes 15, 16.
It passes through the inside of the tube and is combined with the receiving part 13 of the female pipe 14. Thereafter, as shown in FIG.
7, 18 and each rubber tube 15, 16
is put into an increased pressure state, thereby inserting the male tube 11 into the insertion part 1.
2 and the receiving part 13 of the female pipe 14 is closed to shut off water.

In this case, when the male tube 11 is inserted into the female tube 14, the rubber tubes 15 and 16 are in a reduced pressure state, so the insertion portion 13 of the male tube 11 can easily pass through, making it extremely easy to work underwater. Furthermore, if a fluid rubber-like substance is injected into the rubber tubes 15 and 16, a flexible joint can withstand earthquakes and uneven ground subsidence.

Further, after water is stopped by each rubber tube 15, 16, if the water remaining in the space 21 between these is removed by the second feeding means 22 and the outside air is allowed to pass through, it is possible to It is possible to know the water stop state, and it becomes extremely easy to confirm the water stop property.

Furthermore, if water intrusion into the space 21 occurs due to insufficient water stoppage, or regardless of the presence or absence of water intrusion, the curing agent feeding means or the second feeding means 22 may be used to
By filling it with a hydration reaction type curing agent,
It can be completely watertight. Incidentally, after the water stoppage work is completed, it goes without saying that unnecessary parts such as the pumps of the feeding means 17, 18, 22 are removed.

As is clear from the above embodiments, in the present invention, a male tube and a female tube are fitted together through a plurality of annular rubber tubes in a reduced pressure state, and then outside air or a fluid rubber-like substance, etc. The joint is water-tightened by injecting a pressure-increasing substance to create a pressure-increasing state, making it extremely easy to connect the male and female pipes underwater. In addition, the water stop state can be easily confirmed by sending outside air between the rubber tubes in the increased pressure state while sucking the water remaining between the rubber tubes and detecting the moisture mixed in the outside air. .

Furthermore, after confirming the above-mentioned water-stopping property, a water-reactive hardening agent is injected in place of outside air and is filled between the rubber tubes, so even in the event of water intrusion, the hardening agent will protect the tubes. The water is then shut off.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an underwater concrete pipe joint using a water-stopping method according to the prior art, FIG. 2 is a cross-sectional view of a device used in a water-stopping method according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view taken along the - line in FIG. 2, and FIG. 4 is a half cross-sectional view showing an embodiment of the water stopping method of the present invention using the water stopping device shown in FIG. 2, and also showing that the rubber tube is in a reduced pressure state. Similar to FIG. 4, FIG. 5 is a half-sectional view showing an embodiment of the water stop method using the water stop device shown in FIG. 2, and showing that the rubber tube is in an increased pressure state. DESCRIPTION OF SYMBOLS 11... Male tube, 12... Insertion part, 13... Receiving part, 14... Female tube, 15, 16... Rubber tube, 17, 18... Feeding means, 19, 20... Feeding tube, 21 ...Space, 22...Second feeding means (curing agent feeding means), 23...Feeding pipe.

Claims (1)

[Claims] 1. At the joint of an underwater concrete pipe consisting of a combination of a male pipe and a female pipe, a plurality of annular rubber tubes in a depressurized state are placed in advance at a distance from each other on either the inner periphery of the receiving part of the female pipe or the outer periphery of the insertion part of the male pipe. Then, combine the insertion part of the male tube with the reception part of the female tube, and then increase the pressure inside the rubber tube by injecting a pressure increasing substance to close the space between the reception part of the female tube and the insertion part of the male tube. At the same time, outside air is introduced while sucking the water remaining between the rubber tubes in the increased pressure state, and after detecting the moisture in the outside air and confirming the water-stopping property, a water-reactive curing agent is used instead of the outside air. A water stop method for joints of underwater concrete pipes, characterized by injecting and filling between each rubber tube.