JP3455081B2 - Installation method of underwater temporary closing equipment, underwater temporary closing equipment, and watertight hardware - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing an underwater temporary shut-off facility attached to a dam weir body so as to separate a dam weir body and a reservoir when performing improvement work on a dam facility, for example.
The present invention also relates to an underwater temporary cutoff facility and a watertight metal fitting suitable for this underwater temporary shutoff facility.

[0002]

2. Description of the Related Art For example, when performing improvement work on a dam facility,
Prior to the construction, a temporary underwater shut-off facility is temporarily installed on the concrete surface of the dam weir body on the reservoir side, and the construction part of the dam weir body and the reservoir are separated. Hereinafter, a conventional underwater temporary shutoff facility will be described with reference to FIGS. 7 to 10.

In FIGS. 7 to 10, reference numeral 1 denotes a caisson, which is a box-shaped structure attached to the concrete surface 2a of the dam weir body 2 on the reservoir side in order to secure some working space. The caisson 1 has a U-shaped ramen structure in plan view, and is horizontally divided into a plurality of blocks in the height direction to be loaded.

The caisson 1 is installed on the bottom cover 3 previously installed on the concrete surface 2a, and the bottom cover 3, the movable cover 4 mounted on the upper surface of the uppermost block of the caisson 1, and the door stop of the concrete surface 2a. It is integrated with and keeps watertightness, and secures a working space inside. The hydraulic load acting on the caisson 1 is transmitted to the concrete surface 2a via the leg portions 1a of the rigid frame structure.

Reference numeral 5 is a support frame for supporting the weight of the equipment and the buoyancy acting on the caisson 1.
It is transmitted to the concrete surface 2a via the PC anchor 6 (see FIG. 8). Reference numeral 7 is a floating prevention material that is inserted between the uppermost block of the caisson 1 and the support frame 5 after the caisson 1 is installed and before the caisson 1 is drained. The buoyancy is transmitted to the support frame 5 as a compressive force.

Numeral 8 is a hanging metal which connects between the support frame 5 and the bottom lid 3, and the weight of the bottom lid 3 and the weight acting on the bottom lid 3 (the caisson 1, the movable lid 4, the floating prevention material). 7) is transmitted to the support frame 5 as a tensile force.

After the bottom cover 3 is connected to the support frame 5 through the hanging metal 8, it supports the entire weight of the structure located above the bottom cover 3, while the caisson 1 is drained. Water pressure (buoyancy) acting on the bottom surface is transmitted to the caisson 1. The movable lid 4 is closed in advance when the water level may rise, and prevents the water from entering the inside of the caisson 1 when the water level rises above the top of the caisson 1.

In the underwater temporary shut-off equipment having the above-mentioned structure, the watertight metal fitting 9 arranged to face the concrete surface 2a.
The bearing surface of the concrete surface 2 receives the hydraulic load from the underwater temporary shut-off equipment, and the concrete surface 2 is passed through the load transfer mortar 10.
In order to prevent the mortar 10 from flowing out when the load transmitting mortar 10 is injected, as shown in FIG. 14 and FIG. The non-swelling rubber 11a and the water swelling rubber 11b provided on both sides inside the watertight metal fitting 9 follow the unevenness on the concrete surface 2a to make the space for injecting the load transmitting mortar 10 watertight.

The following allowance of the watertight metal fitting 9 for the unevenness of the concrete surface 2a is determined by the expansion amount of the water-swelling rubbers 11b provided on both inner sides of the watertight metal fitting 9 and the concrete surface 2a being attached in a sticky state. It is the total amount of the water swelling rubber 11b coming in and out from the water-tight metal fixture 12, which has been conventionally about 75 mm.

[0010]

By the way, when installing a conventional underwater temporary cutoff equipment equipped with the watertight metal fitting 9 having the above-mentioned structure, the following allowance is applied to the concrete surface 2a on which this underwater temporary cutoff equipment is installed. If there is excess overland or twisting of the installation line on the left and right, it was rectified prior to the installation of the temporary underwater cut-off equipment.
It required a great deal of cost.

In the watertight metal object 9 having the above structure, the non-swelling rubber 11a and the water-swelling rubber 1 used as the watertight rubber.
1b is expensive, and in order to restore the concrete surface 2a to the state before installation of the equipment after removing the underwater temporary cutoff equipment,
In addition to removing the watertight metal fitting 9, it was necessary to scrape off the load transmitting mortar 10.

The present invention has been made in view of the above-mentioned problems of the prior art, and it is possible to omit the work for adjusting the unevenness, and to allow as much as possible to follow the unevenness of the concrete surface. An object of the present invention is to provide a method for installing a large underwater temporary shutoff facility, an underwater temporary shutoff facility, and a watertight metal fitting suitable for this underwater temporary shutoff facility.

[0013]

In order to achieve the above-mentioned object, according to the present invention, after adjusting a position adjusting bolt between a watertight metal fixture and a concrete surface to be mounted on both outer sides of the watertight metal, a liner is provided between them. Will be installed. Then, by doing so, it is possible to omit the work for adjusting the unevenness, and it is possible to increase the follow-up margin to the unevenness of the concrete surface as much as possible.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The method for installing a temporary underwater shutoff facility of the present invention is a method for installing a temporary underwater shutoff facility for securing a working space on a concrete surface of a dam weir body on the side of a reservoir. After the measurement, based on this measurement result, the end face of the watertight metal fitting of the underwater temporary cutoff equipment facing the concrete surface is cut so that the distance between the concrete surface and the end surface is within a predetermined range, and then the watertight metal fitting. The distance between the water swelling rubber and the concrete surface, which are provided through the non-swelling rubber and the pillow for adjusting the margin on the inner sides of the
A pillow for adjusting the feeding margin having a height that is within the swelling margin of the water-swelling rubber is installed, and the distance between the water-tight hardware fixing material and the concrete surface, which are also mounted on both outer sides of the water-tight hardware, is the water-swelling rubber. Install the watertight hardware fixing material so that it is within the swelling allowance, then adjust the position between the watertight hardware fixing material and the concrete surface with the position adjustment bolt, and then install the liner between them and finally, Mortar for load transmission is injected into the metal.

The distance between the concrete surface and the end surface in the method of installing the temporary underwater cut-off equipment of the present invention is the height required for supporting the water-swelling rubber reduced from the height of the water-swelling rubber in consideration of the swelling margin. It is less than or equal to the length.

Further, the temporary underwater shut-off equipment of the present invention is provided at least on a caisson installed on the concrete surface of the dam weir body on the reservoir side, a movable lid installed on the upper surface of the caisson, and a leg portion of the caisson. A watertight metal fitting is provided.The watertight metal fitting is provided with a synthetic rubber at a position relative to the concrete surface so that the load transmitting mortar injected into the portion facing the concrete surface does not come into direct contact with the concrete surface. A position adjusting bolt is projected on a watertight metal fixture fixed to a metal object, and a liner is interposed between the watertight metal fixture whose distance is adjusted by the position adjusting bolt and the concrete surface.

Further, the watertight metal fitting of the present invention is a watertight metal fitting installed in an underwater temporary cutoff facility for securing a working space on the concrete surface of the dam weir body on the reservoir side, and the surface facing the concrete surface is The load transfer mortar injected into the part facing the concrete surface is covered with synthetic rubber so that it does not come into direct contact with the concrete surface, and the watertight metal fixture that is attached to the watertight metal is the concrete surface when the load transfer mortar is injected. It is installed at a height so that it will not come into contact with.

According to the present invention, since the liner is interposed between the watertight metal fixtures adjusted by the position adjusting bolts and the concrete surface, it is possible to omit the work for adjusting the unevenness of the concrete surface, and at the same time The cost to follow up with is also large. In addition, in the underwater temporary shut-off equipment equipped with the watertight metal of the present invention, since the mortar for load transmission does not directly contact the concrete surface, when the concrete surface is restored to the state before the equipment installation after removing the underwater temporary shut-off equipment. It is not necessary to scrape off the load transmitting mortar.

[0019]

EXAMPLES Hereinafter, an installation method of the underwater temporary cutoff equipment of the present invention will be described based on one embodiment shown in FIGS. 1 to 6, and an underwater temporary cutoff equipment of the present invention will be carried out as shown in FIGS. The watertight metal object of the present invention will be described based on examples and based on the embodiments shown in FIGS. 11 and 12. FIG. 1 is an explanatory view of an example of cutting and processing an end face of a watertight metal fitting that faces a concrete surface, FIG. 2 is an explanatory view of an installation example of a height adjustment pillow for adjusting the feeding allowance, and FIG. 3 is an installation example of a watertight metal fixture. FIG. 4 is a diagram showing the positional relationship between the watertight metal object and the concrete surface when the underwater temporary cutoff equipment of the present invention is installed, and FIG. 5 is a cross section of the watertight metal object, the water-swelling rubber, the watertight metal object fixing material and the concrete surface. Figure showing the relationship of the relative distance of, Figure 6 is an explanatory view of the liner interposed between the watertight metal fixture and the concrete surface,
(A) is a side view, (b) is a plan view of the liner, FIG. 7 is a front view of the underwater temporary cutoff facility of the present invention, FIG. 8 is a side view of FIG. 7, FIG. 9 is a front view of a watertight metal object, and FIG. Is a side view of FIG. 9,
FIG. 11 is an explanatory view of the watertight metal article of the present invention, (a) is a sectional view, (b) is a side view showing a mounted state of synthetic rubber, and FIG.
2 is a sectional view of another embodiment of the watertight metal product of the present invention.

First, a method of installing the temporary underwater shut-off equipment of the present invention will be described based on an embodiment shown in FIGS. In the method of installing the temporary underwater shutoff facility of the present invention, first, the dam weir body 2 in which the temporary underwater shutoff facility is installed to secure a working space.
Measure the unevenness of the concrete surface 2a on the reservoir side.

Then, based on this measurement result, the concrete surface 2a of the watertight metal fitting 9 of the underwater temporary shut-off equipment.
The end surface 9a facing the concrete surface 2a and the end surface 9a
It cuts so that the distance d may be within a predetermined range, for example, as shown in FIG. At this time, adjacent watertight hardware 9
Needless to say, the horizontal member 9b of the watertight metal fitting 9 is positioned so as to be linear as shown in FIGS.

The distance d between the concrete surface 2a and the end surface 9a (see FIG. 5) is such that the height of the water-swelling rubber 11b is 60 mm, the swelling margin of the water-swelling rubber 11b is 25 mm, and the water-swelling rubber 11b is supported. If the required length a is 10 mm, the length obtained by subtracting the length a required to support the water-swelling rubber 11b from the height of the water-swelling rubber 11b plus the swelling allowance of the water-swelling rubber 11b The length (75 mm) is slightly smaller than the swelling margin of the water-swelling rubber 11b, for example, 20 mm.
The degree.

Next, the water-swelling rubber 1 provided on both inner sides of the watertight metal fitting 9 with the protrusion adjusting pillow 13 and the non-swelling rubber 11a interposed therebetween.
The distance 13b between the concrete surface 2a and the concrete surface 2a (see FIG. 5) is set to a swelling margin of the water swelling rubber 11b, for example, 25 mm or less, and the pillow 13 for adjusting the working margin is set, for example, as shown in FIG. Install as shown in.

Similarly, the distance c (see FIG. 5) between the watertight metal fixtures 12 mounted on both outer sides of the watertight hardware 9 and the concrete surface 2a is adjusted by the position adjusting bolts 14 when the watertight metal fixtures 12 are adjusted. The watertight metal fixture 12 is installed so as not to interfere with the concrete surface 2a, for example, 10 mm or more, as shown in FIG.

Next, the space between the watertight metal fixture 12 and the concrete surface 2a is adjusted by a position adjusting bolt 14 as shown in FIG. 6, for example, and then a liner 15 is provided therebetween. As a result, the load-transferring mortar 1 in the watertight metal object 9 can be processed without performing the leveling work on the concrete surface 2a.
The injection space of 0 will be watertight. Then, finally, by injecting the load transmitting mortar 10 into the watertight metal fitting 9, the bearing surface of the watertight metal fitting 9 receives a hydraulic load from the caisson 1 or the like, and the load is applied to the concrete surface 2a via the mortar 10. Will be communicated.

According to the above-described installation method for the underwater temporary shut-off equipment of the present invention, since the liner 15 is provided between the watertight metal fixture 12 adjusted by the position adjusting bolt 14 and the concrete surface 2a, the unleveling is adjusted. The work can be omitted, and the allowance for following the unevenness of the concrete surface 2a becomes large.

Next, the underwater temporary cutoff equipment of the present invention equipped with the watertight metal object of the present invention will be described based on the embodiments shown in FIGS. 7 to 12. In FIG. 11, 16 is a watertight metal object of the present invention, which is a concrete surface 2a of the dam weir body 2 on the reservoir side.
The surface opposite to the concrete surface 2a is covered with synthetic rubber 17 so that the mortar 10 injected into the portion facing the concrete surface 2a does not directly contact the concrete surface 2a.

In the embodiment shown in FIG. 11, the synthetic rubber 17 is attached to the water-tight metal object 16 by the rubber pressing bolt 19 so as to be sandwiched by the rubber pressing plate 18.
It may be attached by means such as an adhesive. Also, synthetic rubber 1
It suffices that 7 can prevent the mortar 10 from coming into direct contact with the concrete surface 2a, so that it may be hollow as shown in FIG.

Further, in the watertight metal fitting 16 of the present invention, the watertight metal fitting fixing member 12 attached to the watertight metal fitting 16 is installed at a height position so as not to contact the concrete surface 2a when adjusting with the position adjusting bolt 14. I am doing it.

And, in the underwater temporary cutoff facility of the present invention,
The leg portion 1a of the caisson 1 installed on the bottom cover 3 installed on the concrete surface 2a on the reservoir side of the dam weir body 2 is provided with the watertight metal fitting 16 of the present invention having the above-described configuration, and is attached to this watertight metal fitting 16. Between the watertight metal fixture 12 and the concrete surface 2a, for example, as shown in FIG. 6, a position adjusting bolt 14 is used to adjust, and a liner 15 is interposed therebetween. As a result, the injection space of the load transmitting mortar 10 in the watertight metal fitting 16 is watertight. And
Mortar 10 for load transmission injected into the watertight metal 16
However, the bearing surface of the watertight metal fitting 16 receives a hydraulic load from the caisson 1 or the like, and the concrete surface 2 is inserted through the mortar 10.
The load will be transmitted to a.

According to the temporary underwater cut-off equipment of the present invention provided with the watertight metal fitting 16 of the present invention, the liner 15 is provided between the watertight metal fitting fixing member 12 adjusted by the position adjusting bolt 14 and the concrete surface 2a. In addition to being able to omit the rough rectification work, the margin to follow the unevenness of the concrete surface 2a becomes large, and since the mortar 10 does not directly contact the concrete surface 2a, the underwater temporary cutoff facility was removed. When the concrete surface 2a is later restored to the state before the installation of the equipment, it is not necessary to scrape off the mortar 10.
Further, since the unevenness of the concrete surface 2a can be followed only by the synthetic rubber 17, the facility cost can be reduced.

Needless to say, the present invention is not limited to the above-described embodiment, but can be applied to an underwater temporary shut-off facility of the type shown in FIG.

[0033]

As described above, according to the present invention,
It is possible to omit the roughening work and increase the allowance to follow the unevenness of the concrete surface. Further, according to the underwater temporary cut-off equipment of the present invention including the watertight metal object of the present invention,
After removing the underwater temporary cutoff equipment, when restoring the concrete surface to the state before installation of the equipment, it is not necessary to scrape off the mortar, and it is possible to follow the unevenness of the concrete surface only with synthetic rubber, so the equipment cost can be reduced .

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a cutting process of an end surface of a watertight metal object that faces a concrete surface.

FIG. 2 is an explanatory diagram of an installation example of a height adjustment pillow for adjusting the output allowance.

FIG. 3 is an explanatory diagram of an installation example of a watertight metal fixture.

FIG. 4 is a diagram showing a positional relationship between a watertight metal object and a concrete surface when the underwater temporary cutoff facility of the present invention is installed.

FIG. 5 is a diagram showing a relationship between a cross section of a watertight metal object, water swelling rubber, and a relative distance between a watertight metal object fixing material and a concrete surface.

6A and 6B are explanatory views of a liner interposed between a watertight metal fixture and a concrete surface, FIG. 6A is a side view, and FIG. 6B is a plan view of the liner.

FIG. 7 is a front view of the underwater temporary cutoff facility of the present invention.

FIG. 8 is a side view of FIG. 7.

FIG. 9 is a front view of a watertight metal object.

FIG. 10 is a side view of FIG. 9.

FIG. 11 is an explanatory view of the watertight metal article of the present invention, (a) is a sectional view, and (b) is a side view showing a mounted state of synthetic rubber.

FIG. 12 is a sectional view of another embodiment of the watertight metal object of the present invention.

FIG. 13 is a diagram showing another example of an underwater temporary shutoff facility to which the present invention is applied.

FIG. 14 is a cross-sectional view of a conventional watertight metal object.

FIG. 15 is an enlarged view of a main part of FIG. 14, where (a) is a view before swelling of the water-swelling rubber and (b) is a view showing after swelling of the water-swelling rubber.

[Explanation of symbols]

1 caisson 1a legs 2 dam dam body 2a Concrete surface 3 Bottom lid 4 movable lid 5 support frame 7 Lifting prevention material 8 hanging hardware 9 Watertight hardware 9a end face 10 Load transmission mortar 11b Water swelling rubber 12 Watertight hardware fixing material 13 Adjusting pillow 14 Position adjustment pillow 15 liner 16 Watertight hardware 17 Synthetic rubber

Continuation of front page (56) Reference JP-A-9-41389 (JP, A) JP-A-51-61123 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02B 7 / 00 E02D 19/04

Claims (3)

(57) [Claims] 1. A method of installing an underwater temporary cutoff facility for securing a working space on a concrete surface of a dam weir body on the reservoir side, after measuring the unevenness of the concrete surface and then based on this measurement result. The end face of the watertight metal object facing the concrete face is cut so that the distance between the concrete face and the end face falls within a predetermined range, and then,
Pillows for adjusting the production allowance on both insides of the watertight metal object, height adjustment so that the distance between the water swelling rubber provided through the non-swelling rubber and the concrete surface is within the swelling allowance of the water swelling rubber Install the pillow for the water-tight metal fittings, and also install the water-tight metal fittings so that the distance between the water-tight metal fittings to be mounted on both outer sides of the water-tight metal and the concrete surface is within the swelling margin of the water-swelling rubber. In addition, after adjusting the position between the watertight metal fixture and the concrete surface with position adjustment bolts, insert a liner between them, and finally, inject the load transmission mortar into the watertight metal underwater. How to install deadline equipment. 2. A caisson installed at least on the concrete surface of the dam weir body on the reservoir side, a movable lid mounted on the upper surface of the caisson, and a watertight metal object provided on a leg portion of the caisson. A synthetic rubber is provided at a relative position to the concrete surface, and the mortar for load transmission injected into the relative portion to the concrete surface is prevented from coming into direct contact with the concrete surface, and the water-tight metal fixture is attached to the water-tight metal fixture. An underwater temporary shut-off facility characterized by projecting position adjusting bolts and interposing a liner between the concrete surface and the watertight metal fixtures whose intervals are adjusted by the position adjusting bolts. 3. A watertight metal object installed in an underwater temporary shut-off facility that secures a working space on the concrete surface of the dam weir body on the reservoir side, wherein the surface facing the concrete surface is a part relative to the concrete surface. The load transfer mortar to be injected is covered with synthetic rubber so that it does not come into direct contact with the concrete surface, and the watertight metal fixture that is attached to the watertight metal is of a height that does not contact the concrete surface when the load transfer mortar is injected. Watertight hardware that is installed in a position.