Water supply device and water supply method

Abstract

To provide a water feed arrangement of green cut working water without using inside a concrete, which does not interfere with concrete placement work, and a water feed method.SOLUTION: A water feed arrangement 10 for feeding green cut working water for treating a concrete joint surface 12 generated when constructing concrete of concrete structure 20 includes: a water supply means 14 provided outside the concrete structure 20 for supplying the green cut working water; a first pipe 16 that is connected to the water supply means 14 and arranged outside a concrete formwork 30 placed at a position where a wall 22 of the concrete structure 20 is formed; and a second pipe 18 that is connected to the first pipe 16 extending toward the concrete joint surface 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water supply device and a water supply method suitable for green cutting work on concrete joint surfaces in the RCD construction method. [Background technology]

[0002] Conventionally, the cruise RCD method has been adopted in concrete dam construction and the like. This method improves the overall pouring speed by pouring the inner concrete, which has a faster pouring speed, before the outer concrete, which has a slower pouring speed. When applying this RCD method to concrete dam construction, green cutting work is performed to remove laitance that occurs on the concrete joint surface. Conventional green cutting work has been performed using water supplied from pipes buried inside the dam embankment or from pipes extended from both banks of the dam embankment along the crest to the entire embankment (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-81466 [Patent Document 2] Japanese Patent Application Publication No. 6-81465 Summary of the Invention [Problem to be solved by the invention]

[0004] However, burying pipes inside the dam body may weaken the dam body due to their presence. In addition, pipes must be buried inside the dam body every time concrete is poured to increase the dam body's height, which increases the amount of work required. Furthermore, if pipes are extended from both sides of the dam body along the top edge to the entire dam body, this pipe may interfere with concrete pouring work using the RCD method and other methods. For this reason, there has been a demand for a water supply technology for green cutting work that does not utilize the inside of the concrete and does not interfere with concrete pouring work.

[0005] The present invention has been made in consideration of the above, and aims to provide a water supply device and a water supply method for green cutting work that do not utilize the inside of the concrete and do not interfere with concrete pouring work. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the water supply device of the present invention is a water supply device that supplies water for green cutting work to treat concrete joint surfaces that arise when constructing concrete for a concrete structure, and is characterized by comprising a water supply means provided outside the concrete structure to supply water for green cutting work, a first piping connected to the water supply means and arranged outside a concrete formwork that is installed at a position that will become the wall surface of the concrete structure, and a second piping connected to the first piping and extending toward the concrete joint surface.

[0007] Furthermore, another water supply device according to the present invention is characterized in that, in the above-mentioned invention, the first pipe is arranged to connect water supply means provided on the left and right outer sides of the concrete structure, and the second pipe is arranged to branch out from the first pipe at a predetermined interval, and has an opening / closing valve provided in the first pipe at a position between the connection portion of the first pipe and the second pipe, and an opening / closing valve provided in the second pipe near the connection portion.

[0008] In addition, the water supply method of the present invention is a water supply method for supplying green cut work water to treat concrete joint surfaces generated when constructing concrete for a concrete structure, and is characterized by having the steps of providing a water supply means for supplying green cut work water outside the concrete structure, connecting a first piping to the water supply means and arranging a first piping outside a concrete formwork that is installed at a position that will become the wall surface of the concrete structure, and arranging a second piping that is connected to the first piping and extends toward the concrete joint surface.

[0009] Furthermore, another water supply method according to the present invention is characterized in that, in the above-mentioned invention, the first pipe is arranged to connect water supply means provided on the left and right outer sides of the concrete structure, the second pipe is arranged branching off from the first pipe at a predetermined interval, and has an on-off valve provided in the first pipe at a position sandwiching the connection between the first pipe and the second pipe, and an on-off valve provided in the second pipe near the connection, and when a malfunction occurs in the first pipe between adjacent connection parts, the on-off valve provided in the first pipe between this connection part is closed. Effect of the Invention

[0010] According to the water supply device of the present invention, there is provided a water supply device that supplies water for green cutting work to treat concrete joint surfaces that arise when constructing concrete for a concrete structure, and the water supply device is equipped with a water supply means that is provided on the outside of the concrete structure to supply water for green cutting work, a first piping that is connected to the water supply means and is arranged on the outside of a concrete formwork that is installed at a position that will become the wall surface of the concrete structure, and a second piping that is connected to the first piping and extends toward the concrete joint surface.Therefore, it is possible to provide a water supply device that does not utilize the inside of the concrete and does not interfere with concrete pouring work.

[0011] In addition, according to another water supply device of the present invention, the first pipe is arranged to connect water supply means provided on the left and right outside of the concrete structure, and the second pipe is arranged branching off from the first pipe at a predetermined interval and has an opening / closing valve provided in the first pipe at a position sandwiching the connection between the first pipe and the second pipe, and an opening / closing valve provided in the second pipe near the connection.Therefore, if a malfunction occurs in the first pipe between adjacent connection parts, by closing the opening / closing valve provided in the first pipe between these connection parts, it is possible to carry out repair or replacement work on the first pipe where the malfunction has occurred without stopping the water supply function of the first pipe in other sections.

[0012] In addition, according to the water supply method of the present invention, there is provided a water supply method for supplying water for green cutting work to treat concrete joint surfaces that arise when constructing concrete for a concrete structure, and the method includes the steps of providing a water supply means for supplying water for green cutting work on the outside of the concrete structure, connecting the water supply means to the water supply means and arranging a first piping on the outside of a concrete formwork that is installed at a position that will become the wall surface of the concrete structure, and arranging a second piping that is connected to the first piping and extends toward the concrete joint surface. Therefore, it is possible to provide a water supply method that does not utilize the inside of the concrete and does not interfere with concrete pouring work.

[0013] In addition, according to another water supply method of the present invention, the first pipe is arranged to connect water supply means provided on the left and right outside of the concrete structure, and the second pipe is arranged branching off from the first pipe at a predetermined interval and has an on-off valve provided in the first pipe at a position sandwiching the connection between the first pipe and the second pipe, and an on-off valve provided in the second pipe near the connection, so that when a malfunction occurs in the first pipe between adjacent connection parts, the on-off valve provided in the first pipe between this connection part is closed, thereby achieving the effect that repair or replacement work can be carried out on the first pipe where the malfunction has occurred without stopping the water supply function of the first pipe in other sections. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is an upstream view of a dam embankment showing an embodiment of a water supply system and a water supply method according to the present invention. [Diagram 2] FIG. 2 is an enlarged view of a main portion of FIG. [Diagram 3] FIG. 3 is an explanatory diagram of what happens when a malfunction occurs. [Figure 4] FIG. 4 is a partially enlarged view of FIG. 3, where (1) is part A and (2) is part B. [Diagram 5] FIG. 5 is an explanatory diagram for repair and replacement. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A water supply device and a water supply method according to an embodiment of the present invention will be described in detail below with reference to the drawings. However, the present invention is not limited to the embodiment.

[0016] As shown in Fig. 1, a water supply device 10 according to an embodiment of the present invention is used to supply high-pressure washing water (water for green cutting work) for green cutting work to treat a concrete joint surface 12 in concrete dam construction using the cruise RCD method. This water supply device 10 includes a water supply means 14, a first pipe 16, and a second pipe 18. The dam embankment 20 (concrete structure) to be constructed is assumed to be a gravity concrete dam with a substantially right-angled triangular cross section, with the upstream wall surface 22 of the dam embankment being substantially vertical and the downstream wall surface being inclined downstream.

[0017] The water supply means 14 is for supplying water for green cutting work, and is installed on (outside) the ground of the natural ground G on the left bank L and right bank R of the dam embankment 20. This water supply means 14 is equipped with a water tank 24 for storing water, a pump 28 for pressurizing the water in the water tank 24 and sending it to a water supply pipe 26, and a control unit (not shown) for controlling the amount of water supplied. The water supply pipe 26 is disposed downward along the slopes of both the left and right banks L and R, and its lower end is connected to the first piping 16.

[0018] The first pipe 16 is a pipe that is connected to the water supply pipes 26 of the water supply means 14 on both the left and right banks L and R and extends in the dam axial direction. This first pipe 16 can be composed of, for example, a flexible pressure-resistant hose. The first pipe 16 is fixed to fixing parts 32 provided on the outside (upstream side) of the dam form 30 at a predetermined interval in the dam axial direction, and is curved in a catenary shape between adjacent fixing parts 32 in a front view. This curved part is arranged along the upstream wall surface 22 of the existing dam embankment 20. The dam form 30 is a large steel formwork (concrete formwork) that is installed so as to be movable upward at a position that becomes the upstream wall surface 22 of the dam embankment 20 during concrete pouring work.

[0019] The second pipe 18 is connected to the first pipe 16 at the fixing portion 32 and extends vertically upward along the outside of the dam form 30, and a water supply valve 34 is provided at its upper end. The second pipe 18 is arranged by branching out from the first pipe 16 at a predetermined interval. The second pipe 18 can be composed of, for example, a flexible pressure-resistant hose. A plurality of third pipes (not shown) extend from the water supply valve 34 toward various parts of the concrete joint surface 12 at the top end. The third pipe can be composed of, for example, a flexible pressure-resistant hose. The third pipe is easily attached and detached from the water supply valve 34, and has a short range so that high-pressure cleaning water can be sprayed against the concrete joint surface 12 near the water supply valve 34. By shortening the third pipe, it becomes easy to handle the concrete top end, and installation and removal work can be performed quickly. The workability is improved by reducing the handling work. These prevent it from interfering with the RCD method.

[0020] 2, butterfly valves 38, 40 (on-off valves) are provided near the connection 36 between the first pipe 16 and the second pipe 18. The valve 38 of the first pipe 16 is provided at a position sandwiching the connection 36. The valve 40 of the second pipe 18 is provided near the connection 36. By providing partitions within the first pipe 16 and the second pipe 18 using the valves 38, 40, when a malfunction occurs, it is possible to stop water supply to only that portion and perform maintenance work such as repairs and replacement. Since maintenance work such as repairs and replacements can be performed without stopping the green cutting work, process delays can be prevented.

[0021] The operation and function of the above configuration will now be described. As shown in Fig. 1, first, water supply means 14 for supplying water for green cutting work are installed on the ground on both left and right banks L, R of the dam embankment 20. Next, first piping 16 is placed on the outside of the dam form 30 and fixed to fixing parts 32 at a predetermined interval in the dam axial direction. In addition, the first piping 16 is connected to the water supply means 14 on both left and right banks L, R.

[0022] Next, the second pipe 18 is connected to the first pipe 16 and extended vertically upward along the dam form 30. Furthermore, a third pipe is connected to the water supply valve 34 at the upper end of the second pipe 18 and extended toward various points on the nearby concrete joint surface 12. This completes the installation of the water supply device 10.

[0023] When green cutting work is to be performed, the supply of water for green cutting work is started from the water supply means 14. The work water supplied from the water supply means 14 passes through the water supply pipe 26, the first pipe 16, the second pipe 18, and the third pipe in this order as high-pressure cleaning water, and is supplied to various locations over the entire area of ​​the concrete joint surface 12 at the top of the dam body 20. This water can be used to perform the green cutting work. This improves the efficiency of the green cutting work and makes it possible to shorten the process.

[0024] According to this embodiment, the first pipe 16 and the second pipe 18 are arranged on the outside of the dam form 30 and the upstream side of the dam embankment 20, and are not buried inside the dam embankment 20, nor are they arranged on the concrete top. The third pipe is arranged on the concrete top, but can be easily installed and removed as necessary. Therefore, according to this embodiment, it is possible to provide a water supply device that does not utilize the inside of the concrete and does not interfere with concrete pouring work such as the RCD method. In addition, this water supply device 10 can be used until the completion of the dam embankment 20, and since it is not buried inside the dam embankment 20, there is no risk of the strength of the dam embankment 20 decreasing. As long as there are water supply facilities such as the water supply means 14 on the ground of both left and right banks L and R, it can be implemented at any time at low cost, and can be easily introduced later even if it is not in the initial plan.

[0025] Furthermore, as shown in Fig. 3, when a defect such as breakage occurs in the first pipe 16 between adjacent connections 36, as shown in Fig. 4(1) and (2), the on-off valve 38 provided in the first pipe 16 between these connections 36 may be closed. In this way, as shown in Fig. 5, it is possible to carry out repair or replacement work on the first pipe 16 having the defect without stopping the water supply function of the first pipe 16 in other sections.

[0026] As described above, the water supply device of the present invention is a water supply device that supplies water for green cutting work to treat concrete joint surfaces that arise when constructing concrete for a concrete structure, and is equipped with a water supply means that is provided on the outside of the concrete structure to supply water for green cutting work, a first piping that is connected to the water supply means and is arranged on the outside of a concrete formwork that is installed at a position that will become the wall surface of the concrete structure, and a second piping that is connected to the first piping and extends toward the concrete joint surface.Therefore, it is possible to provide a water supply device that does not utilize the inside of the concrete and does not interfere with concrete pouring work.

[0027] In addition, according to another water supply device of the present invention, the first pipe is arranged to connect water supply means provided on the left and right outside of the concrete structure, and the second pipe is arranged branching off from the first pipe at a predetermined interval, and has an opening / closing valve provided in the first pipe at a position sandwiching the connection between the first pipe and the second pipe, and an opening / closing valve provided in the second pipe near the connection.Therefore, if a malfunction occurs in the first pipe between adjacent connection parts, by closing the opening / closing valve provided in the first pipe between these connection parts, repair or replacement work can be carried out on the first pipe with the malfunction without stopping the water supply function of the first pipe in other sections.

[0028] Furthermore, according to the water supply method of the present invention, there is provided a water supply method for supplying water for green cutting work to treat concrete joint surfaces that arise when constructing concrete for a concrete structure, the method comprising the steps of providing a water supply means for supplying water for green cutting work on the outside of the concrete structure, connecting the water supply means to the water supply means and arranging a first piping on the outside of a concrete formwork that is installed at a position that will become the wall surface of the concrete structure, and arranging a second piping that is connected to the first piping and extends toward the concrete joint surface. Therefore, a water supply method can be provided that does not utilize the inside of the concrete and does not interfere with concrete pouring work.

[0029] In addition, according to another water supply method of the present invention, the first pipe is arranged to connect water supply means provided on the left and right outside of the concrete structure, and the second pipe is arranged branching off from the first pipe at a predetermined interval, and has an on-off valve provided in the first pipe at a position sandwiching the connection between the first pipe and the second pipe, and an on-off valve provided in the second pipe near the connection, so that when a malfunction occurs in the first pipe between adjacent connection parts, the on-off valve provided in the first pipe between this connection part is closed, so that repair or replacement work can be carried out on the first pipe where the malfunction has occurred without stopping the water supply function of the first pipe in other sections. [Industrial Applicability]

[0030] As described above, the water supply device and water supply method of the present invention are useful for green cutting work in dam concrete construction, and are particularly suitable for supplying water for green cutting work which does not utilize the inside of the concrete and does not interfere with concrete pouring work. [Explanation of symbols]

[0031] 10 Water supply device 12 Concrete joint surface 14 Water supply means 16 First piping 18 Second piping 20 Dam body (concrete structure) 22 Wall 24 Aquarium 26 Water supply pipe 28 Pump 30 Dam Form (concrete formwork) 32 Fixed part 34 Water Tap 36 Connection 38,40 Valve (on-off valve) G. Ground L left bank R right bank

Claims

1. A water supply device that supplies water for green cutting work to treat concrete joint surfaces that occur when constructing concrete for a concrete dam body, a first piping arranged to connect the water supply means provided on the left and right outer sides of the concrete dam embankment and arranged in the dam axial direction along the outside of a concrete formwork installed at a position that will become the upstream or downstream wall surface of the concrete dam embankment; a second piping arranged to branch off from the first piping at predetermined intervals and extend upward along the outside of the concrete formwork toward the concrete joint surface; a water supply valve provided at the upper end of the second piping; a pair of first on-off valves provided in the first piping at positions sandwiching the connection between the first piping and the second piping; and a second on-off valve provided in the second piping near the connection.

2. A water supply method for supplying water for green cutting work to treat concrete joint surfaces generated when constructing concrete for a concrete dam body, comprising: the step of providing water supply means for supplying water for green cutting work on the ground of the natural ground on the left and right outer sides of the concrete dam body; the step of arranging a first pipe in the dam axial direction along the outside of a concrete form installed at a position that will become the upstream or downstream wall surface of the concrete dam body so as to connect the water supply means provided on the left and right outer sides of the concrete dam body; the step of arranging second pipes that branch out at predetermined intervals from the first pipe and extend upward along the outside of the concrete form toward the concrete joint surface; the step of providing a pair of first on-off valves in the first pipe at positions sandwiching a connection portion between the first pipe and the second pipe; and the step of providing a second on-off valve in the second pipe near the connection portion, A water supply method characterized in that, when a malfunction occurs in the first piping between adjacent connection parts, the first on-off valve provided in the first piping between the connection parts is closed.

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