JPH06185199A - Insulation board - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce the number of heaters to prevent concrete from freezing in concrete construction in cold regions, and to reduce the heat source cost for driving the heater and labor cost. Provide a heat insulating dam plate. A heat insulating dam plate 35 according to the present invention includes a plate portion 3501 that contacts the cast concrete 23, and a heat insulating material 3503 that is provided on a surface opposite to the surface of the plate portion 3501 that contacts the concrete 23. The heat insulating material 35
03 is formed by spraying a resin foam on the plate portion 3501.

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 dam plate constituting a formwork, and more particularly to a heat insulation dam plate suitable for concrete construction in cold regions.

[0002]

2. Description of the Related Art In concrete work, first, a mold is assembled at a place where concrete should be poured by a weir board, a splint, a supporting work, etc., and then concrete is cast in the mold, and then, Curing is performed so that the strength of the concrete is expressed, and after curing, the formwork is disassembled. In curing concrete, various matters such as not giving vibration and avoiding direct sunlight are protected, but in cold regions, in order to prevent freezing of concrete, the temperature of concrete is, for example, 2 ° C or higher. Need to keep.

Therefore, conventionally, as shown in FIG.
The outside of the formwork 3 located outside the concrete wall 1 is covered with a curing sheet 5, and another sheet 7 is hung over the inside of the curing sheet 5, so that the concrete wall 1 and the concrete slab 9 are surrounded by this sheet 7. Further, the inner space portion 11 defined by the concrete wall 1 and the outer space portion 13 defined by the concrete wall 1 and the curing sheets 5 and 7 are both heated by the jet heater 15 to freeze the concrete. I try to prevent it.

[0004]

However, in such a conventional curing method, for example, in order to heat the inner space portion 11, four jet heaters 15 and the outer space portion 13 are heated. 6 jet heater 15
Since a large number of jet heaters 15 are required such as a stand, there are problems such as kerosene cost and labor costs for circling the heaters. The present invention has been devised in view of the above circumstances, and an object of the present invention is to reduce the number of heaters for preventing concrete freezing in concrete construction in cold regions, and to reduce the heat source cost for driving the heaters. It is to provide a heat insulating weir plate that can reduce the cost and labor cost.

[0005]

In order to achieve the above-mentioned object, a heat insulating weir plate according to the present invention has a structure of a weir plate which constitutes a form, and a plate portion which comes into contact with cast concrete, It is characterized in that it is composed of a heat insulating material attached to the surface opposite to the surface of the plate portion in contact with the concrete. Further, the heat insulating material is a resin foam, and is attached by being sprayed onto the plate portion.

[0006]

EXAMPLE An example applied to concrete construction in a cold region will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of a mold part to which a heat insulating dam plate is assembled, and FIG. 2 is an explanatory view of concrete curing. In FIG. 1, 21 is a formwork, 23 is a cast concrete wall, 25 is an inner space portion located inside the building, and 27 is an outer space portion located outside the building. The formwork portion 21A located in the inner space portion 25 of the concrete wall 23 has a dam plate 29,
A large number of piers 31 extending up and down at a large number of locations at predetermined intervals in the horizontal direction of the barrier plate 29, and a large number of piers 31.
It is composed of two single-pipe pipes 33 and the like extending in the horizontal direction on the back surface of.

Further, the formwork portion 21B located in the outer space portion 27 of the concrete wall 23 is provided with a heat insulating dam plate 35 according to the present invention, and a large number of the heat insulating dam plate 35 provided at predetermined intervals in the horizontal direction. A large number of piers 31 extending vertically in some places
It is composed of two single pipes 33 and the like extending in the horizontal direction on the back surface of a large number of piers 31.

The dam plate 29 and the heat insulating dam plate 35 are composed of a separator 37 and a separator 3 which penetrate the concrete wall 23.
7 are respectively connected to both ends of the rib tie 39, a rib seat 41 loosely engaged with the foam tie 39 and locked to the back surfaces of the two single pipes 33, and a foam tie 3 at the back surface of the rib seat 41.
It is tightly connected by a nut 43 which is connected to 9.

The heat insulating dam plate 35 is composed of a plate portion 3501 and a heat insulating material 3503. The plate portion 3501 is located on the side in contact with concrete and is made of plywood. The heat insulating material 3503 is located on the side opposite to the side in contact with the concrete, and is formed by spraying a resin foam on the plate portion 3501 with a predetermined thickness. As the resin foam, for example, urethane foam, polystyrene foam, polyvinylel foam, or the like can be used.

After the concrete is placed in the mold 21 having such a structure, the concrete is cured, and when the concrete is cured, it is assembled on the outside of the concrete wall 23 as shown in FIG. Formwork 2
The outside of 1 is covered with a curing sheet 5, and the sheet 7 is laid over the concrete slab 45 so as to surround the placed concrete slab 45. Then, the jet heater 15 is arranged on the floor of the inner space portion 25 of the concrete wall 23 to heat the inner space portion of the concrete wall 23 to prevent freezing of the concrete.

When the heat insulating dam plate 35 according to the present embodiment is used, the cold outside air is not directly transmitted to the concrete due to the heat insulating effect of the heat insulating material 3503, so that it is surrounded by the curing sheet 5 and the concrete wall 23 as in the conventional case. It is not necessary to dispose the jet heater 15 in the space portion, and therefore, the number of heaters for preventing the freezing of concrete can be reduced, which reduces the heat source cost for driving the heater and the labor cost for circling the heater. Can be reduced.

Although a material other than foamed resin can be used as the heat insulating material 3503, if a foamed resin body is used, the heat insulating dam plate 35 can be easily formed by spraying, so that the heat insulating dam plate 35 is manufactured. It will be advantageous. Also, the plate portion 3
Although a steel plate such as plywood can be used for 501, a steel plate 501 is advantageous in terms of heat insulation.

[0013]

As is apparent from the above description, according to the heat insulating weir plate according to the present invention, the plate portion in contact with the cast concrete and the surface opposite to the surface of the plate portion in contact with the concrete are provided. Since it is composed of attached heat insulating material, it reduces the number of heaters to prevent concrete from freezing in concrete construction in cold regions, reduces the heat source cost for driving the heater and reduces labor costs. Can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a mold part to which a heat insulating dam plate is assembled.

FIG. 2 is an explanatory diagram of curing of concrete work using a heat insulating dam plate.

FIG. 3 is an explanatory diagram of curing of conventional concrete work.

[Explanation of symbols]

 21 formwork 23 concrete wall 35 heat insulating dam plate 3501 plate part 3503 heat insulating material

Continued Front Page (72) Inventor Masao Ninai 4-6-15 Sendagaya, Shibuya-ku, Tokyo Fujita Co., Ltd.

Claims (2)

[Claims] 1. A structure of a dam plate constituting a formwork, comprising a plate portion in contact with cast concrete, and a heat insulating material attached to a surface opposite to the surface of the plate portion in contact with the concrete. A heat-insulating weir plate, characterized in that 2. The heat insulating dam plate according to claim 1, wherein the heat insulating material is a resin foam and is attached by being sprayed onto the plate portion.