JP2022096117A - Equipment foundation structure - Google Patents

Abstract

To provide technology that can reduce the size of the entire structure while improving construction efficiency in equipment foundation structure installed on slabs such as rooftops.SOLUTION: The present invention comprises a precast concrete equipment foundation body 10 installed on a slab 5 with a fixing member 30, which is formed in a tubular shape having a through hole 10A penetrating vertically in the central portion and protruding upward from the slab 5, inserted through the through hole 10A, and a filler curing portion 20 formed by filling and curing a filler in the through hole 10A of the equipment foundation main body 10 into which the fixing member 30 is inserted. A plurality of anchor members 15 for fixing the equipment are arranged inside the plurality of foundation pillar main bars 11 in the equipment foundation main body 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a facility foundation structure installed on a slab such as a rooftop.

Conventionally, a facility basic structure installed on a slab such as a rooftop is known (see, for example, Patent Document 1).
The equipment foundation structure described in Patent Document 1 is an equipment foundation structure installed on a slab (base concrete surface 14) such as a roof, and includes an equipment foundation body (pre-concrete member 12) made of precast concrete, concrete, grout, etc. A filler curing portion (filling material portion 26), which is formed by filling and curing the filler of the above, is provided. The equipment foundation main body (12) is formed in a cylindrical shape having a through hole (cavity portion 13) penetrating up and down in the central portion, and is a fixing member (several reinforcing bars) protruding upward from the slab (14). 22) is installed on the slab (14) with the through hole (13) inserted. The filler curing portion (26) is configured as a through hole (13) of the equipment foundation main body (12) into which the fixing member (22) is inserted, filled with a filler such as concrete or grout, and cured. To.
Further, in the equipment foundation structure described in Patent Document 1, the leg portion of the gantry for fixing the equipment is arranged in advance in the through hole of the equipment foundation main body into which the fixing member is inserted, and the through hole is filled. By embedding it at the same time as filling the material, the legs of the equipment stand are configured to be fixed to the hardened part of the filler.

Japanese Patent No. 5576207 (Fig. 2, etc.)

However, since it is necessary to temporarily support the legs of the equipment frame in the through holes of the equipment foundation main body before the filler is filled, the work becomes complicated. Further, since the width of the through hole of the equipment foundation main body needs to be large enough to allow the legs of the equipment base to be arranged, the increase in size of the entire equipment foundation structure becomes a problem. Further, even when the leg portion of the equipment pedestal itself is not embedded in the filler hardening portion formed by filling the through hole with the filler and hardening the filler, a smaller anchor member is embedded. Since interference between the fixing member and the anchor member in the through hole becomes a problem, there is a limit to reducing the size of the entire equipment foundation structure by sufficiently reducing the width of the through hole.
In view of this situation, a main problem of the present invention is to provide a technique capable of reducing the size of the entire structure while improving the construction efficiency in the equipment foundation structure installed on a slab such as a rooftop.

The first characteristic configuration of the present invention is an equipment foundation structure installed on a slab.
Made of precast concrete, which is formed in a cylindrical shape having a through hole penetrating up and down in the center, and is installed on the slab with a fixing member protruding upward from the slab inserted through the through hole. Equipment foundation body and
A filler curing portion formed by filling and curing a filler in a through hole of the equipment foundation body into which the fixing member is inserted is provided.
A plurality of anchor members for fixing the equipment are arranged inside the plurality of foundation pillar main bars in the equipment foundation main body.

According to this configuration, a plurality of anchor members for fixing the equipment are arranged not in the central filler hardening portion but in the outer equipment foundation body surrounding the anchor member, so that the filler is filled. Temporary support of the anchor member to the through hole of the main body of the equipment foundation is not required, and the width of the through hole through which only the fixing member is inserted can be reduced.
On the other hand, in the equipment foundation main body, even when the width is reduced, the through holes in the plurality of foundation pillar main bars and the central portion while ensuring a sufficient cover thickness of the foundation column main bar with respect to the outer surface of the facility foundation body. It is possible to secure a space for arranging a plurality of anchor members between the wall surface and the wall surface facing the surface.
Therefore, according to the present invention, it is possible to provide a technique capable of reducing the size of the entire structure while improving the construction efficiency in the equipment foundation structure installed on a slab such as a rooftop.

In the second characteristic configuration of the present invention, a steel beam is arranged in the lower part of the slab.
The lower end of the fixing member is fixed to the steel beam.

According to this configuration, the lower end of the fixing member is not only embedded in the slab but also fixed to the steel beam arranged under the slab by welding or the like, so that the fixing member is firmly fixed. .. Therefore, the bending moment acting on the basic structure of the equipment is directly transmitted to the steel beam at the lower part of the slab through the member for the fixing portion, so that high yield strength can be efficiently realized.

The third characteristic configuration of the present invention is that the fixing portion of the fixing member in the steel frame beam is an intersection of a plurality of the steel frame beams.

According to this configuration, four steel frames on the outer peripheral end of the equipment foundation body on the compression side due to the bending moment acting on the equipment foundation structure are firmly supported by the steel beams intersecting each other, so that a plurality of steel frames are provided. It is possible to efficiently realize high yield strength against bending moments acting along the longitudinal direction of each beam.

The fourth characteristic configuration of the present invention is that the fixing member is a group of fixing reinforcing bars in which a plurality of fixing reinforcing bars extending in the vertical direction are dispersedly arranged.

According to this configuration, the fixing member embedded in the filling material hardening portion, which is formed by filling the through hole of the equipment foundation body with the filling material and hardening the filler, appropriately forms a plurality of fixing reinforcing bars extending in the vertical direction. Since the fixing reinforcing bars are dispersedly arranged at intervals, a filler can be appropriately interposed in the gaps between the fixing reinforcing bars constituting the fixing reinforcing bars. As a result, the fixing reinforcing bar group can be firmly fixed to the hardened portion of the filler by sufficiently allowing the adhesion area of the fixing reinforcing bar group to the filler.

A vertical sectional view showing the configuration of the equipment foundation structure of the present embodiment. AA sectional view in FIG. BB sectional view in FIG.

An embodiment of the equipment foundation structure according to the present invention will be described with reference to the drawings.
The equipment foundation structure 100 shown in FIG. 1 is a foundation structure installed on a slab 5 such as on a rooftop or in a factory facility, on which legs 1 of equipment (not shown) are placed and fixed. ..
In the present embodiment, the slab 5 is made of concrete, and a steel beam 6 including a first steel beam 6A and a second steel beam 6B intersecting each other is laid under the slab 5. Further, the leg 1 of the equipment is made of a square steel pipe, and a base plate 1A mounted on the upper surface of the equipment foundation structure 100 via the non-shrink mortar layer 3 is provided at the lower end thereof. Then, the anchor bolt 15 (an example of the anchor member) protruding from the upper surface of the equipment foundation structure 100 is inserted into the bolt hole formed in the base plate 1A and the nut 2 is screwed into the foot portion 1 of the equipment. The base plate 1A provided at the lower end is fixed to the upper surface of the equipment foundation structure 100.

The equipment foundation structure 100 has a structure for reducing the size of the entire structure while improving the construction efficiency, and the details thereof will be described below.
As shown in FIGS. 1 and 3, the equipment foundation structure 100 includes an equipment foundation main body 10 and a filler hardening portion 20.

The equipment foundation main body 10 is formed in a square cylinder shape having a through hole 10A penetrating vertically in the central portion, and the fixing member 30 protruding upward from the slab 5 is inserted into the through hole 10A in a state of being inserted into the slab. It is configured as a member made of precast concrete installed on the non-shrink mortar layer 4 via the non-shrinkage mortar layer 4.

In the concrete portion of the equipment foundation main body 10, a plurality of foundation pillar main bars 11 extending in the vertical direction are distributed and arranged in the circumferential direction in a plan view, and are horizontally arranged so as to surround these foundation pillar main bars 11. A plurality of extending stirrups 12 are arranged. Further, as a method of forming a through hole 10A in the central portion of the equipment foundation main body 10 made of precast concrete, a sheath tube is installed in advance before concrete is placed at the time of manufacturing the equipment foundation main body 10, and concrete is placed on the outside thereof. By casting, the inside of the sheath tube can be formed as a through hole 10A.

In the state where the equipment foundation main body 10 is installed on the slab 5, the filler hardening portion 20 fills the through hole 10A of the equipment foundation main body 10 into which the fixing member 30 is inserted with a filler such as grout or concrete. It is configured as a hardened part. That is, the fixing member 30 projecting upward from the slab 5 is embedded in the filler hardening portion 20 and fixed.

Further, the fixing member 30 is a group of fixing reinforcing bars in which a plurality of (for example, six) fixing reinforcing bars 31 extending in the vertical direction are dispersedly arranged at appropriate intervals. Therefore, the filler is appropriately interposed in the gaps between the fixing reinforcing bars 31 constituting the fixing member 30, and the adhesion area of the fixing member 30 to the filler is sufficiently secured. The fixing member 30 is firmly fixed to the filler hardening portion 20.

As shown in FIGS. 1 and 2, a plurality of (for example, four) anchor bolts 15 for fixing the leg 1 of the equipment are provided in the equipment foundation structure 100 at each corner in a plan view (see FIG. 2). It is distributed in. As shown in FIGS. 1 and 3, these plurality of anchor bolts 15 are provided in advance on the equipment foundation main body 10 in a posture in which the upper portion is projected from the upper surface in a state where the lower portion is embedded in the precast concrete portion of the equipment foundation main body 10. It is provided.

Then, in the equipment foundation main body 10, these plurality of anchor bolts 15 are arranged inside the plurality of foundation pillar main bars 11. That is, a plurality of anchor bolts 15 for fixing the equipment are arranged not in the filler hardening portion 20 in the central portion but in the outer equipment foundation main body 10 surrounding the anchor bolts 15. This eliminates the need for temporary support of the anchor bolt 15 in the through hole 10A of the equipment foundation main body 10 before the filler is filled. Further, since only the fixing member 30 is inserted into the through hole 10A, the width thereof can be made as small as possible. Further, even when the width of the equipment foundation main body 10 is made as small as possible, the width of the through hole 10A is small, so that the cover thickness of the foundation pillar main bar 11 with respect to the outer surface of the equipment foundation main body 10 is sufficiently secured. In this state, a sufficient space for arranging the plurality of anchor bolts 15 is sufficiently secured between the plurality of foundation pillar main bars 11 and the wall surface facing the through hole 10A in the central portion.

The lower end of each anchor bolt 15 embedded in the equipment foundation main body 10 is provided with a folded portion 15a folded back in a U shape. As shown in FIGS. 1 and 3, the folded-back portion 15a is in a state of protruding laterally with respect to the axial center on the upper end portion side in which the nut 2 (see FIG. 2) is screwed.

The protruding direction of the folded-back portion 15a is a direction toward the axial center of another anchor bolt 15 located adjacent to the anchor bolt 15 in the plan view shown in FIG. 3, and is an anchor with the center of the through hole 10A in the central portion. The direction has an angle with respect to the straight line connecting the axis of the bolt 15. As a result, the diameter of the through hole 10A is made as large as possible while avoiding interference between the sheath tube forming the wall surface of the through hole 10A and the folded portion 15a of the anchor bolt 15, and a plurality of fixings are made in the through hole 10A. Reinforcing bars 31 can be distributed and arranged at wider intervals. In the present embodiment, the protruding direction of the folded-back portion 15a of the anchor bolt 15 is set to the direction toward the axial center of the anchor bolt 15 located adjacent to the anchor bolt 15, but the interference with the sheath tube constituting the outer wall of the through hole 10A may occur. The protruding direction may be changed to, for example, a direction toward the center of the through hole 10A within a range that does not cause a problem.

As shown in FIGS. 1 and 3, a steel frame beam 6 is arranged at the lower part of the slab 5, and the lower ends of a plurality of fixing reinforcing bars 31 constituting the fixing member 30 are arranged at the lower part of the slab 5. Since it is fixed to the upper flange of the steel frame beam 6 by welding, the fixing of the plurality of fixing reinforcing bars 31 to the slab 5 side is strengthened. Therefore, since the bending moment acting on the equipment foundation structure 100 is directly transmitted to the steel frame beam 6 at the lower part of the slab 5 through the plurality of fixing reinforcing bars 31, high yield strength is efficiently realized.

Further, the fixing points of the fixing member 30 composed of the plurality of fixing reinforcing bars 31 with respect to the steel frame beam 6 are defined as the intersections 6a of the plurality of first steel frame beams 6A and the second steel frame beams 6B intersecting with each other. .. With this configuration, four locations (four ends on the top, bottom, left, and right of the equipment foundation body 10 in FIG. 3) on the outer peripheral end of the equipment foundation structure 100 on the compression side due to the bending moment acting on the equipment foundation structure 100 are provided. It will be firmly supported by the steel beams 6A and 6B that intersect each other. Therefore, it is possible to more efficiently and highly withstand the bending moment acting along the longitudinal direction of each of the plurality of 6A and 6B intersecting with each other.

[Another Embodiment]
Other embodiments of the present invention will be described. It should be noted that the configurations of the respective embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

(1) In the above embodiment, the lower end of the fixing member 30 is directly fixed to the steel frame beam 6 arranged at the lower part of the slab 5, but only the slab 5 is fixed without fixing the lower end of the fixing member 30 to the steel frame beam 6. It may be configured to be fixed and fixed to.

(2) In the above embodiment, in the steel frame beam 6, the fixing portion of the fixing member 30 is the intersection 6a between the first steel frame beam 6A and the second steel frame beam 6B, but the fixing portion of the fixing member 30 is fixed. May be a portion of the steel frame beam 6 other than the intersection 6a.

(3) In the above embodiment, the fixing member 30 is a group of fixing reinforcing bars in which six fixing reinforcing bars 31 are dispersedly arranged, but the number and arrangement state of the fixing reinforcing bars 31 can be appropriately changed. Is. Further, for example, an anchor bolt or the like other than the reinforcing bar can be used as the fixing member 30.

5 Slabs 6, 6A, 6B Steel beams 6a Crossings 10 Equipment foundation body 10A Through holes 11 Foundation columns Main bars 15 Anchor bolts (anchor members)
20 Filler hardened part 30 Fixing member 31 Fixing reinforcing bar 100 Equipment foundation structure

Claims (4)

It is a facility foundation structure installed on the slab.
Made of precast concrete, which is formed in a cylindrical shape having a through hole penetrating up and down in the center, and is installed on the slab with a fixing member protruding upward from the slab inserted through the through hole. Equipment foundation body and
A filler curing portion formed by filling and curing a filler in a through hole of the equipment foundation body into which the fixing member is inserted is provided.
An equipment foundation structure in which a plurality of anchor members for fixing equipment are arranged inside a plurality of foundation pillar main bars in the equipment foundation main body. A steel beam is placed at the bottom of the slab,
The equipment foundation structure according to claim 1, wherein the lower end of the fixing member is fixed to the steel frame beam. The equipment foundation structure according to claim 2, wherein the fixing portion of the fixing member in the steel frame beam is an intersection of a plurality of the steel frame beams. The equipment basic structure according to any one of claims 1 to 3, which is a group of fixing reinforcing bars in which a plurality of fixing reinforcing bars extending in the vertical direction are dispersedly arranged.

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