JP2011043027A - Foundation structure for equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation structure for an electrical water heater which improves the earthquake resistance of a water heater foundation composed of a concrete foundation panel for installing and fixing the water heater, and reduces the weight of the concrete foundation panel without dividing it into a plurality of blocks to improve the efficiency of installation work. <P>SOLUTION: The foundation structure for the electrical water heater includes the concrete foundation panel constructed by superposing a reinforced concrete upper panel 2 on a reinforced concrete lower panel and connecting both panels to each other with bolts. The water heater 12 is placed on the upper surface of the upper panel. The upper and lower panels have mortar-filling openings at their centers that are joined to form a vertical opening when both the panels are superposed on each other and filled with mortar. In each mortar-filling opening, the upper end of an underground anchor driven into the underground below the mortar-filling openings is coupled to a reinforcing bar, and mortar is filled to fix the anchor to the concrete foundation panel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a foundation structure for equipment using a concrete foundation plate for installing and fixing the equipment.

  When installing a water heater on the ground in a detached house, to prevent the water heater from falling due to an earthquake or land subsidence, etc. A base plate has been proposed (see Patent Documents 1 and 2).

  In the concrete foundation plate of Patent Document 1, the upper prefabricated block composed of a left block and a right block divided into two and the lower prefabricated block composed of a front block and a rear block divided into two are orthogonal to each other. The upper and lower prefabricated blocks are joined and integrated with bolts.

  In addition, the concrete foundation plate of Patent Document 2 is formed by superimposing a top plate made of first, second, and third prefabricated concrete blocks that are divided into three parts and joined to each other on a bottom plate made of one prefabricated concrete block. In addition, the first, second, and third prefabricated concrete blocks are connected to the bottom plate with bolts, and a circular opening is provided in the center of the bottom plate and the upper plate. The butt joint surface of the concrete block is formed on an inclined surface.

Japanese Patent Laid-Open No. 11-050470 Utility Model Registration No. 3132880 Specification

  Regarding electric water heater foundations as equipment installed in detached houses, off-the-shelf foundation boards that satisfy the 0.4 G horizontal static load specified in the “Guidelines for Seismic Design and Construction of Building Facilities (issued by Nippon Building Center)” have become widespread. However, there was no ready-made foundation board with earthquake resistance that satisfies the horizontal static load of 1G or more recommended by the “Electric Water Heater Seismic Strengthening Committee”. Therefore, the seismic performance could not be secured unless the housing side wall and the water heater were fixed with metal fittings to prevent the water heater from falling.

  The concrete base plate of Patent Document 1 is formed of four divided blocks for weight reduction, but has a drawback that a certain amount of total weight must be ensured in order to have 0.4G earthquake resistance. .

  Therefore, the present invention improves the earthquake resistance of the foundation for the equipment using the concrete foundation plate for installing and fixing various devices including the electric water heater, and reduces the weight of the concrete foundation plate to improve the efficiency of the installation work. The basic structure for equipment which can be realized is provided.

  The equipment foundation structure according to claim 1 prevents the equipment overturning at the time of earthquake by fixing the upper end portion of the underground anchor that has been driven into the ground below the reinforced concrete board and the concrete foundation board. It is characterized by.

  In the device basic structure according to claim 2, on the upper surface of the upper plate, a portion having a thin plate pressure for supporting the load of the device and a leg fixing portion for fixing a leg fixing anchor for fixing the leg portion of the device are formed. The leg fixing part is formed in a convex shape having a thick plate pressure that can be fixed by driving a leg fixing anchor, whereby the weight of the board can be reduced.

  In the present invention, since the concrete foundation plate is fixed by an underground anchor that secures the earth resistance, even a lightweight foundation plate prevents the device from falling, and the earthquake resistance is improved. In addition, the weight of the base plate can be reduced by reducing the concrete plate pressure in the portion excluding the equipment leg fixing portion.

  In the present invention, since the total weight of the base plate is reduced and can be carried by an operator, the transport work of the base plate is facilitated.

It is a perspective view of the concrete foundation board used for the foundation structure for water heaters of this invention. It is a disassembled perspective view of the concrete foundation board shown in FIG. It is a figure which shows the construction procedure of the foundation structure for water heaters of this invention. It is a figure which shows the construction procedure following FIG. It is a figure which shows the construction procedure following FIG.

  An embodiment of a basic structure for a water heater according to the present invention will be described with reference to the drawings.

  1 and 2, the concrete foundation plate used for the electric water heater foundation structure is composed of a rectangular lower plate 1 and an upper plate 2 superimposed on the lower plate 1.

  The lower plate 1 is a reinforced concrete plate having a flat surface, and a mortar filling opening 4 is formed at the center of the bottom plate 1 and is opened up and down to be filled with mortar to fix the upper end of the underground anchor 3 (FIG. 3). ing.

  Around the edge of the mortar filling opening 4, a reinforcing bar groove 6 for supporting a reinforcing bar 5 (FIG. 4) for locking the upper end of the underground anchor 3 is formed on the opposite side. The incisor groove 6 has a depth at which the incisor 5 does not come out of the surface of the lower plate 1 because the lower plate 1 and the upper plate 2 are brought into surface contact with each other. Bolt holes 7 into which bolts for connecting the lower plate 1 and the upper plate 2 are screwed are formed at three locations on the lower plate 1.

  Similar to the lower plate 1, the upper plate 2 is a reinforced concrete plate and has an area that coincides with the upper plate 2 when it is stacked on the lower plate. In the center of the upper plate 2, similarly to the lower plate 1, a mortar filling opening 8 penetrating vertically is formed at a position corresponding to the mortar filling opening 4 of the lower plate 1.

  The upper plate 2 has a flat bottom surface in surface contact with the lower plate 1, and a bolt hole 9 through which a bolt connecting the lower plate 1 and the upper plate 2 passes is formed on the upper surface to which the electric water heater 12 (FIG. 5) is fixed. The three lower leg / upper board connecting portions 10 and the leg fixing anchors 14 (FIG. 5) for fixing the leg portions 13 (FIG. 5) of the water heater 12 are fixed. And are formed alternately. The leg fixing portion 11 is thicker than the lower plate / upper plate connecting portion 10 because the leg fixing anchor 14 (FIG. 5) is deeply driven to have a thickness capable of obtaining the earthquake resistance of the installation portion of the leg portion 13. .

  The size of the concrete foundation board depends on the size of the installed object such as a water heater. For example, the dimensions of the lower board 1 are about 680 mm in length, about 780 mm in width, about 40 mm in thickness, and the dimensions of the upper board 2. The lower plate / upper plate connecting portion is about 680 mm in length and about 780 mm in width like the lower plate 1, the thickness of the leg fixing portion 11 to which the water heater 12 is fixed is about 80 mm, and the bolt hole 9 is formed. 10 is about 40 mm like the lower plate 1. The weight of the lower plate 1 and the upper plate 2 is, for example, not more than a weight that can be carried by two workers, for example, not more than about 70 kg.

  As the underground anchor 3, one having a large earth bearing strength that can withstand a tensile force from the ground is selected. As an example, a known stay anchor (Japanese Patent Laid-Open No. 2001-152451) is provided with a ring 16 through which an insertion line passes at the upper end, and two resistance plates 17 extending outward in the ground at the lower end as shown in FIG. For example, a commercially available minite anchor (manufactured by Nippon Geotechnical Co., Ltd.) can be used.

  Next, the construction procedure of the foundation structure according to the present invention will be described.

  3A, after excavating a hole 15 having a depth of about 100 mm, a length of about 900 mm and a width of about 900 mm at a place where the water heater is to be installed, a minite anchor is driven into the center of the hole 15 as the underground anchor 3. . After driving the ring 16 at the upper end of the minite anchor 3 to a height matching the ground surface, the two resistance plates 17 in the ground are spread outward.

  In FIG. 3 (b), after the driving of the underground anchor 3 is completed, the cracking stone 18 is spread in the hole 15 and then the mortar 19 is laid. The mortar 19 is laid so that the ring 16 at the upper end of the minite anchor 3 that is lowered from the ground surface is not hidden.

  In FIG. 3 (c), after confirming that the mortar 19 is horizontal with a leveler, when the lower plate 1 and the upper plate 2 are overlapped, the mortar 19 below the mortar filling openings 4, 8 A hole 20 into which mortar is poured is formed by drilling about 300 mm in length, about 300 mm in width, and about 50 mm in depth around the minite anchor 3.

  In FIG. 4D, after the excavation of the hole 15 is completed, the lower plate 1 is installed in the hole 15 so that there is no gap or rattling with the mortar 19.

  4 (e) and 4 (f), the incisor 5 passed through the ring 16 of the minite anchor 3 is inserted into the incisor groove 6 of the lower plate 1 and supported. Next, a plurality of reinforcing bars 21 are fixed with a wire perpendicular to the insertion bar 5.

  Next, after the upper plate 2 is overlaid on the lower plate 1, bolts are screwed into the bolt holes 7 and 9 (FIG. 2) of the lower plate 1 and the upper plate 2 to fix the lower plate 1 and the upper plate 2. .

  After the fixing of the lower plate 1 and the upper plate 2 is completed, the mortar 22 is filled into the mortar filling openings 4 and 8 and the hole 20 of the laying mortar 19 to fix the minite anchor 3.

  In FIG. 5 (g), after fixing the minite anchor 3, a hole 23 is opened with a concrete drill at a position where the leg fixing anchor 14 of the leg fixing part 11 of the upper plate 2 is driven, and the leg fixing anchor is inserted into the hole 23. 14 is driven and fixed.

  In FIG. 5 (h), the leg-fixed anchor 14 that has been driven is inserted into the hole of the leg 13 of the water heater 12, and a nut is screwed into the screw of the leg-fixing anchor 14 and fixed.

  The foundation structure thus constructed was tested assuming a seismic force acting when the 460L water heater is full (total weight 570 kg), and as a result, tilted about 4 degrees with a horizontal dredging load of 5.59 kN, but there was no abnormality. It was. Further, at a load of 6.66 kN, the concrete base plate was cracked, and the upper plate and the lower plate were separated from each other, but there was no overturn.

1: Lower plate 2: Upper plate 3: Underground anchor 4: Mortar filling opening 5: Insert bar 6: Insert bar groove 7: Bolt hole 8: Mortar filling opening 9: Bolt hole 10: Lower plate / upper plate Connecting part 11: Leg fixing part 12: Water heater 13: Leg part 14: Leg fixing anchor 15: Hole 16: Ring 17: Resistance plate 18: Split chestnut 19: Laying mortar 20: Hole 21: Reinforcing bar 22: Mortar 23 : Hole

Claims (2)

  A foundation structure for equipment comprising a concrete foundation board to which equipment is fixed on the upper surface of a reinforced concrete board, and being fixed to an underground anchor that has been driven into the ground below the board and has secured a ground resistance.   As a method of fixing the device to the plate, on the upper surface of the plate, a thin portion of the plate pressure that supports the load of the device and a leg fixing portion that fixes a leg fixing anchor that fixes the leg of the device are formed, A base structure for equipment, wherein the leg fixing part is formed in a convex shape having a thick plate pressure that can be fixed by driving a leg fixing anchor.

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