JP4531492B2 - Construction method to prevent frost heave - Google Patents

Description

  The present invention relates to a structure for preventing freezing.

  In cold districts such as Hokkaido, the concrete foundation is deeply embedded so as to exceed the freezing depth as a countermeasure against freezing on the concrete foundation of the building.

  However, the method of deeply embedding the foundation beyond the freezing depth has a problem that the amount of excavation and backfilling of the soil, the amount of concrete, and the amount of reinforcing bars increase, leading to a longer construction period and cost increase.

  Moreover, in a cold district, a structure in which a plurality of piles are struck on the ground so that the pile heads protrude above the upper surface of the ground at a distance from each other and the piles support the building. There is also a problem that it is impossible to install soil concrete there because the lower ground freezes.

  In view of the above-mentioned problems, the present invention provides a frost heave prevention structure that can prevent frost heave of concrete foundations, soil concrete, etc., and that can be realized at a short construction period and at a low cost. Let it be an issue.

  The above problem is that the depth of penetration of the concrete foundation of the structure such as a building is set to be shallower than the freezing depth, and the heat insulation wall reaching the depth position exceeding the freezing depth is provided on the ground outside the foundation. This is solved by the anti-freezing structure (first invention).

  In this structure, the depth of concrete foundation of structures such as buildings is set to be shallower than the freezing depth, so the amount of soil excavation and backfill, the amount of concrete, and the amount of reinforcing bars to form the foundation are reduced. It is possible to realize a short construction period and low cost.

  Moreover, since the ground outside the foundation is provided with a heat insulating wall that reaches a depth exceeding the freezing depth, even if the depth of penetration of the concrete foundation is set shallower than the freezing depth as described above, the foundation Will not freeze.

  Further, in the present invention, the depth of penetration of the structure into the ground is set to be shallower than the freezing depth, and the heat insulation wall reaching the depth position exceeding the freezing depth is provided on the ground outside the deepening portion. The anti-freezing structure (second invention) characterized by the above.

  In other words, the foundations are not limited to concrete foundations, but may be the foundations of various structures standing on the ground. Even in such cases, the insulation walls can prevent the structures from freezing. Moreover, it is possible to reduce the burden on the construction of the structure.

  In addition, the above problem is that a plurality of piles are struck at a distance from each other to a position deeper than the freezing depth so that the pile head protrudes above the upper surface of the ground. Frost prevention, characterized in that soil concrete is provided on the ground surface under the structure supported by the piles of the soil, and a heat insulation wall reaching a depth position exceeding the freezing depth is provided on the ground outside the soil concrete. This is solved by the structure (third invention).

  In this structure, the ground outside the soil concrete is provided with a heat insulating wall that reaches a depth exceeding the freezing depth, so as described above, the pile heads are protruded above the ground surface. Even if the ground surface under the supported structure is finished with soil concrete, the soil concrete does not cause frost heave. In addition, since it is only necessary to provide a heat insulating wall on the ground outside the soil concrete, it can be realized in a short construction period and at a low cost.

  In each of the above inventions, the heat insulating wall is made of a heat insulating panel in which a resin such as urethane is foamed in a metal frame, and the foamed resin and the metal frame are integrated by an adhesive action during foaming. Good. According to this heat insulating wall, the foamed resin heat insulating material and the metal frame are integrated by the adhesive action at the time of foaming. Can be done easily.

  Since the present invention is as described above, it is possible to prevent the freezing of the concrete foundation or the concrete between the soil and the like, and it can be realized in a short construction period and at a low cost.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  The frost heave prevention structure of the first embodiment shown in FIG. 1 and FIG. 2 is for a building, and the foundation 1 is composed of a solid solid foundation as shown in FIG. As shown in FIG. 1 (a), the penetration depth of the ground is set to be shallower than the freezing depth D of the ground 2 so that it is adjacent to the concrete foundation 1 outside the foundation 1, that is, on the ground 2 on the outdoor side. The heat insulating wall 3 is provided over the entire circumference of the building so as to reach a depth position exceeding the freezing depth D of the ground 2 and as shown in FIG.

  As shown in FIG. 2 (a), the heat insulating wall 3 is composed of a plurality of heat insulating panels 4 ..., and each heat insulating panel 4 is formed in a metal frame 5 as shown in FIG. 1 (b). A foamed resin such as urethane is used, and the foamed resin 6 and the metal frame 5 are integrated into a rectangular plate shape by an adhesive action during foaming. And the lower end part 4a is thinned and formed in the shape of a point, and it is driven into the ground 2 by press-fitting using a machine such as a back fore. When the ground surface 2a is so hard that it cannot be driven by press fitting, the ground 2 may be excavated and embedded. In that case, the sharpness of the lower end 4a may be omitted.

  Moreover, as shown in FIG. 1 (C), joint portions 4b and 4b for joining adjacent heat insulation panels 4 and 4 are provided on both sides of each heat insulation panel 4, and the joint portions 4b and 4b are connected to each other. By performing the press-fitting while engaging, the relative displacement in the out-of-plane direction and the approaching / separating direction is restricted, and a clean driving state can be easily formed.

  In the above structure, since the depth of penetration of the solid solid foundation 1 is shallower than the freezing depth D, the amount of soil excavation and backfill, the amount of concrete, and the amount of reinforcing bars to form the solid solid foundation It can be reduced, and a short construction period and low cost can be realized. And since the ground 2 outside the solid foundation 1 is provided with the heat insulating wall 3 reaching the depth position exceeding the freezing depth D, as described above, the penetration depth of the solid foundation 1 is shallower than the freezing depth. Even if it sets, the solid foundation 1 does not freeze up.

  Furthermore, in said embodiment, since the heat insulation panel 3 is formed using the heat insulation panel 4 in which the foamed resin heat insulating material 6 is reinforced with the metal frame 5, it can be constructed by driving in by press fitting. There is no need to excavate or backfill the soil. In particular, in the present embodiment, the foamed resin heat insulating material 6 and the metal frame body 5 are integrated by an adhesive action at the time of foaming, which is made of foamed resin such as urethane in the metal frame body 5. Therefore, it is possible to easily carry out the construction by driving by press-fitting even the ground which is very strong in strength and hard to some extent. Moreover, even when the thermal insulation panel 4 is constructed by embedding by excavation, the thickness of the heat insulating material necessary for preventing frost heave is not so large, so that the amount of excavation and backfilling of earth and sand is large. There is no, and construction can be performed easily.

  The structure of the second embodiment shown in FIG. 3 is that a plurality of steel piles 7... Are dispersed at a distance from each other so that the pile heads 7 a protrude above the upper surface 2 a of the ground 2. The soil concrete 8 is provided on the ground surface 2a below the building (not shown) supported by these piles 7 ... and is deeper than D. The ground 2 outside the soil concrete 8 has a depth exceeding the freezing depth D. The heat insulating wall 3 reaching this position is provided so as to surround the soil concrete 8 over the entire circumference. In addition, 9 is the steel beam passed between the steel piles 7 ..., 10 is a heat insulation decorative board which hides the pile head 7a. The heat insulating wall 3 is the same as that in the first embodiment.

  In this structure, since the heat insulation wall 3 reaching the depth position exceeding the freezing depth D is provided on the ground outside the soil concrete 8, the pile head 7 a is projected above the ground surface 2 a as described above. Even if the ground upper surface 2a under the building supported by the piles 7 is finished with the soil concrete 8, the soil concrete 8 does not cause freezing, and the ground wall 2 outside the soil concrete 8 has a heat insulating wall 3 Therefore, it can be constructed at a short construction period and at a low cost.

  Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, in the above-described embodiment, the heat insulating wall 3 is formed by foaming a resin such as urethane in the metal frame 5, and the foamed resin 6 and the metal frame 5 are integrated by an adhesive action at the time of foaming. 4, the heat insulating wall may be made of a foamed resin plate or the like when construction by excavation and embedding is assumed. The structure of the first invention is not limited to a solid foundation, but can be applied to various concrete foundations such as cloth foundations and independent foundations. It can also be applied to concrete foundations of various structures such as. Regarding the structure of the third invention, the structure on the concrete soil is not limited to a building, and may be various structures.

FIG. 1 shows the frost heave prevention structure of the first embodiment, in which FIG. (A) is an enlarged sectional front view of an essential part, (b) is a perspective view of a heat insulation panel, and (c) is a plane showing a joint part between the heat insulation panels FIG. FIG. 1A is an overall plan view of the frost heave prevention structure, and FIG. It is a cross-sectional front view which shows the frost heave prevention structure of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Concrete foundation 2 ... Ground 2a ... Top surface of ground 3 ... Insulation wall 4 ... Insulation panel 5 ... Metal frame 6 ... Foam resin insulation 7 ... Pile 7a ... Pile head 8 ... Dirt concrete D ... Depth of freezing

Claims (3)

The ground is excavated shallower than the freezing depth, and the concrete foundation of the structure such as a building is formed so that the penetration depth is shallower than the freezing depth, and the soil is backfilled and frozen to the ground outside the foundation. A construction method for preventing frost heave, characterized by providing a heat insulating wall reaching a depth position exceeding the depth. Excavate the ground shallower than the freezing depth, form a structure so that the rooting depth is shallower than the freezing depth, backfill the soil, and exceed the freezing depth on the ground outside the rooting portion A construction method for preventing frost heave, characterized by providing a heat insulating wall reaching a depth position. A heat insulating panel obtained by foaming a resin such as urethane in a metal frame and integrating the foamed resin and the metal frame by an adhesive action at the time of foaming is used as the heat insulating wall. The construction method for preventing frost heaving according to claim 1 or 2, wherein the method is performed by press-fitting into the ground.

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