JPH0651993B2 - Construction method in cold weather in snowy regions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention relates to a cold construction method in a snowy cold region.

"Conventional technology" In the construction of the skeleton construction in cold snowy areas, it is absolutely necessary to secure the initial strength in order to prevent frost damage to the concrete. For this reason, the whole building should be surrounded by a heat insulation sheet, or in addition to this It is necessary to enclose the concrete pouring floor with a heat insulation sheet to collect heat. As described above, since a large amount of expenses are required for heat collection, warming and curing, etc., conventionally, in snowy and cold regions such as Hokkaido and Tohoku, most of the construction work during the winter season is due to additional construction costs such as temporary construction work. It was not done. The ratio of the increase cost to the construction cost depends on the building application and scale, but the outer scaffold is covered with sheets, double-coated or veneered to protect the surrounding area, and the outer scaffold is heated and cured with a jet heater. Depending on the measure, 2
It is about 10%.

Recently, in the construction industry, the awareness of year-round construction work is gradually increasing, and especially in the case of private works, the profit from the early completion of the building may be greater than the additional construction cost required for construction in the cold after the Sapporo Winter Olympics. Gradually, it was understood that construction work was started in the cold.

From the national economic point of view, it is very significant from the national economic point of view that the year-round construction work will result in year-round employment and the utilization of idle facilities in winter. Probably, there is also a proposal to keep the heat-retaining and curing space to the minimum necessary in Japanese Utility Model No. 58-153652.

“Problems to be solved by the invention” In the conventional means, first, in the vertical concrete part of the pillars / walls, then the horizontal part of the floor, and the subsequent concrete pouring, the heat insulation curing for the horizontal part is the upper floor beam. It is sufficient to horizontally stretch the heat insulation sheet,
The heat insulation and curing of the vertical portion must be performed so as to completely surround the outer wall of the unassembled rebar structure, and there are problems such as troublesome installation of the heat insulation sheet and expansion of the heating space.

The present invention has been made in view of the above circumstances, by preliminarily assembling the outer formwork of the precast outer wall body, eliminating the need for heat retention curing for the vertical portion, and installing a heat insulation sheet for the upper girder. The purpose is to provide a new cold weather construction method in a cold snowy region where the heat insulation sheet is stretched and the space for collecting heat is reduced.

[Means for Solving Problems] In order to achieve the above-mentioned object, in the construction method of the present invention, ventilation is applied to the assembled rebar top end of a thin-walled precast half-finished product for exterior finishing such as tile driving reinforced with assembly rebar. Fix a possible metal or plastic net,
In order to effectively integrate it with post-cast concrete, either apply wet spray insulation to this or install and fix a rigid molded insulation at the top end of the rebar to form a ventilation layer in the middle part. The thin composite precast concrete slab semi-finished product is preliminarily attached by a predetermined floor from the concrete pouring floor as an outer form of the outer wall skeleton with an insulating composite panel in which an anchor protruding through the heat insulating material is planted, As a heat insulating curing wall of this vertical part, by contacting it, a heat insulating sheet is horizontally stretched on the upper beam of the concrete placing floor, while warming the space formed by the heat insulating composite panel and the heat insulating sheet, It is assumed that concrete will be placed in the vertical and horizontal parts.

[Action] The rationalization that the heat insulating composite panel performs heat retention in the vertical part simplifies the installation of heat insulation sheets and significantly reduces the heating space, reducing the amount of heat.

[Example] An example will be described with reference to the drawings.

1A to 1C are longitudinal sectional views of the outer wall of the outer heat insulation provided with the ventilation layer according to the present invention, a view taken along the line bb in FIG. A, and an enlarged detailed view of a portion c in FIG. FIG. 2 is an actual construction mode diagram of the building, FIGS. 3A to 3C are conventional cold construction explanatory diagrams, cold construction explanatory diagrams utilizing the present invention, and enlarged detailed views of essential parts in FIG. In the figure, reference numeral 1 is a semi-finished thin-walled precast plate product for exterior finishing such as tile driving, which is reinforced with an assembled rebar 1a, and a vented metal net or plastic net 2 is provided at the top end of the assembled rebar 1a. Is fixed.

Furthermore, a wet spray or molded heat insulating material 3 is fixed to the net 2.

Alternatively, a rigid molded heat insulating material may be installed and fixed to the top end of the assembled rebar 1a without a net as a base.

The ventilation layer 4 is formed in the gap between the heat insulating material 3 and the precast plate semi-finished product 1. The ventilation layer 4 is continuously provided in the vertical direction of the wall body to ventilate the inside of the ventilation layer 4. By providing the ventilation layer, it is possible to prevent dew condensation inside the heat insulating layer and to diffuse moisture that permeates moisture due to the difference in vapor pressure between the indoor and outdoor sides, so that it is possible to prevent deterioration of the heat insulating performance of the heat insulating material 3 or deterioration of the heat insulating material 3.

In the case of the embodiment shown in FIGS. b and c, by providing the concrete ribs 1b having the same construction as the assembled rebar 1a on the left and right vertical joints of the semi-finished precast concrete plate 1 and fixing the net 2 made of metal or plastic. The net 2 is prevented from flowing out of the vertical joints and reinforced against the lateral pressure.

This is preferable because it serves as a reinforcing rib for the plate itself.

In addition, the assembled reinforcing bars 1a may be arranged at the left and right vertical joints (not shown).

Further, a spacer may be appropriately bent (not shown).

Although not shown, the precast plate half-finished product 1 is preliminarily provided with preliminarily-separated separator members, which eliminates the need for an external scaffold for the formwork.

Numeral 5 is an anchor for precasting the semi-finished product 1 of the precast concrete slab for the purpose of pre-planting and framing concrete, and penetrating the heat insulating material 3.

The heat insulating composite panel 6 having a ventilation layer in the middle of the above configuration is manufactured in a factory.

A formwork is assembled by using the panel 6 as an outer formwork of the outer wall body,
The skeleton concrete 7 is placed to construct the outer wall.

In addition, 8 and 9 in the figure c are backup materials in joints, 10
Indicates caulking material.

The heat-insulating composite panel 6 provided with the above-mentioned ventilation layer can be easily produced in a pre-caulking factory, can also be used as a formwork of a skeleton concrete, and can be quickly finished with exterior, thus reducing construction cost and construction period. It leads to shortening.

Exterior finishing material is thin precast concrete slab 1
On the other hand, it is possible to freely select painting, spraying tiles, driving in tiles, driving in stones, or finish-up. In addition, thin precast concrete slab 1
Since it is a factory production, it is possible to manufacture high quality and high precision products.

Then, although the outer wall of the outer heat insulation having the ventilation layer is completed by the inner formwork dismantling after the casting and solidification of the frame concrete 7, external work of the formwork is unnecessary and regardless of the exterior finishing material, There is no need to post-apply to the concrete,
The advantage is that neither scaffolding nor work is required for that.

FIG. 2 shows the upper and lower end treatment procedure of the ventilation layer 4, and the lower end of the ventilation layer 4 is opened to the outside 4a and the upper end is opened to the parapet 11 and degassed from the opening 12 of the parapet 11. In the case where the window portion 13 is interposed in the middle, communication is made by forming a bypass path along the outside of the peripheral frame of the window portion 13 so as to bypass it.

As a result, an upflow distribution airway is formed.

Next, the construction method of the present invention utilizing the above advantages will be described.

FIG. 3a shows a conventional construction method for a structure in cold weather. As described above, the steel frame construction 14 is completed in advance, the outer scaffold 15 is arranged, and the heat insulation curing 16 is performed on the outer scaffold 15. A curing sheet 17 is attached to the ceiling for the concrete pouring floor 19, and a jet heater is applied to the closed space from inside and outside the body.
Heat curing such as 18 is added, but according to the present invention, it is as follows.

That is, as shown in FIGS. 3b and 3c, the panel 6 is hung up without an external scaffold, and the panel 6 is hung on the concrete pouring floor 19
Install 1-2 floors ahead.

The panel 6 acts as an insulating form.

Naturally, the steel frame work and the pillar / beam arrangement on the floor of the preceding installation will be completed.

And the heat insulation curing is a horizontal curing with a sheet at the top of the beam 1 or 2 floors above the concrete pouring floor 19
Do.

The heat collection 21 may be performed in a narrow closed space by the horizontal curing 20.

"Effects of the Invention" According to the present invention, the following effects are achieved.

(1) It is possible to significantly reduce winter curing costs (concrete temperature compensation costs, heat collection costs, curing costs, etc.) in cold and snowy areas.

(2) The working environment can be greatly improved.

(3) The difference in temperature distribution between parts of the concrete is small, and since the temperature correction can be reduced, the occurrence of shrinkage cracks in the concrete is small.

(4) It is easy to secure the quality of the structure associated with cold weather construction.

Further, the heat-insulating composite panel adopted by the present invention has a large effect of the heat-insulating form, and since heating around the building is not required, it is possible to significantly reduce the cost of temporary construction work, and the initial frost damage of the skeleton concrete can be prevented. It is difficult to receive, and it is possible to construct a high quality frame, and because this heat insulating composite panel can be installed 1-2 floors ahead of the concrete pouring floor in the SRC structure, the construction period of the frame construction can be greatly shortened. Or, on the working floor, the curing for the outside is complete and a complete working environment is obtained. Further, especially in cold weather construction in cold regions, a comfortable work space can be obtained by blocking cold wind, snow, etc., and work efficiency can be improved.

[Brief description of drawings]

1 (a) to 1 (c) are longitudinal sectional views of the outer wall of the outer heat insulation provided with the ventilation layer according to the present invention, a view taken along the line bb in FIG. A, and an enlarged detailed view of the encircled line c in FIG. FIG. 2 is an actual construction mode diagram of a building, and FIGS. 3A to 3C are a conventional cold construction explanatory diagram, a cold construction explanatory diagram of the present invention, and an enlarged detailed view of essential parts in FIG. 1 …… Precast semi-finished product, 1a …… Assembled rebar, 1b ……
Concrete ribs, 2 ... Net, 3 ... Insulation material, 4 ...
… Ventilation layer, 4a, 4b …… Opening, 5 …… Anchor, 6 …… Insulation composite panel, 7 …… Skeletal concrete, 8,9 …… Backup material, 10 …… Caulking material, 11 …… Parapet, 12… … Aperture, 13 …… Window, 14 …… Steel frame work, 15 External scaffolding, 16 …… Insulation curing, 17 …… Curing sheet, 18 …… Jet heater, 19 …… Concrete floor, 20 …… Horizontal Curing, 21 …… Heat collection.

Front Page Continuation (72) Inventor Toshiyuki Ritsunari 4-1, Odori Nishi, Chuo-ku, Sapporo, Hokkaido Inside Takenaka Corporation Hokkaido Branch (72) Inventor Shunichi Mizumaki 4-chome, Odori Nishi, Chuo-ku, Sapporo, Hokkaido Shares Company Takenaka Corporation Hokkaido Branch (72) Inventor Kenji Tamura 4-1, Odori Nishi, Chuo-ku, Sapporo, Hokkaido Takenaka Corporation Hokkaido Branch (72) Inventor Kiyoyuki Kanamori 4-chome Odori Nishi, Chuo-ku, Sapporo, Hokkaido Address: Takenaka Corporation Hokkaido Branch (72) Inventor, Masahiro Sagawa 4-chome, Odori Nishi, Chuo-ku, Sapporo-shi, Hokkaido Takenaka Corporation Hokkaido Branch (56) Reference JP 54-139211 (JP, A) ) Actually open 60-172909 (JP, U) Actually open 57-77417 (JP, U)

Claims (1)

[Claims] 1. A prefabricated semi-finished product of a thin-walled product having an exterior finish such as tile driving reinforced with assembled rebars. A ventable metal or plastic net is fixed to the top end of the rebar, and a wet spray insulation material is fixed to the net. Or a rigid molded heat insulating material is installed on the top end of the rebar to fix and form a ventilation layer in the middle part, and for the purpose of effective integration with post-cast concrete, the thin precast concrete plate half-finished product In advance, the heat insulating composite panel in which the anchor protruding through the heat insulating material is planted is attached as the outer formwork of the outer wall frame in advance of the concrete floor by a predetermined floor.
As a heat insulation curing wall of this vertical part, horizontally connecting a heat insulation sheet to the upper beam of the concrete placing floor by connecting to this, while collecting the space formed by the heat insulating composite panel and heat insulation sheet, A method for constructing in the cold in snowy regions, characterized by the fact that concrete is placed in the vertical and horizontal sections.