Facility foundation support structure and facility foundation construction method

Abstract

To provide a facility foundation support structure and a facility foundation construction method which can shorten the period of construction while suppressing stress acting on a building.SOLUTION: A facility foundation support structure comprises: a steel frame building 1; a reinforced concrete floor slab 2 provided at the upper side of the building 1; and a steel frame facility foundation 3 having a support pillar 31 made of a steel material and having an embedded base in the floor slab 2, and in which horizontal force acting during an earthquake is resisted by the horizontal force of the floor slab 2. The support pillar 31 is placed on either a steel column or a steel beam 12 of the building 1, and the lower part of the support pillar 31 is embedded in the floor slab 2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a support structure for a facility foundation and a construction method for a facility foundation. [Background technology]

[0002] Conventionally, facility foundations that support facility equipment have generally been constructed of reinforced concrete (see Patent Document 1 below).

[0003] When constructing a reinforced concrete equipment foundation on top of a reinforced concrete floor slab installed on the roof of a steel-framed building, the reinforced concrete floor slab is constructed after the steel frame of the building is completed. While the reinforced concrete floor slab is being constructed, only the reinforcement for the equipment foundation is arranged, and after the concrete of the floor slab has hardened, the concrete for the equipment foundation is poured, completing the construction of the equipment foundation.

[0004] In addition, when constructing a steel-framed equipment foundation, in order to handle the stress at the base of the steel pillars of the equipment foundation, the steel frame of the building is reinforced in advance to handle the stress at the base, or the steel frame of the building is reinforced. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-40546 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the equipment foundation is made of reinforced concrete, the concrete for the equipment foundation cannot be poured and constructed until the steel frame of the building is completed and the concrete of the reinforced concrete floor slab has hardened, which increases the amount of construction work and lengthens the construction period.In addition, when the equipment foundation is made of steel, there is a problem that additional members are required to reinforce the building side.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and provides a support structure for an equipment foundation and a construction method for an equipment foundation that can reduce the construction period while suppressing the stress acting on a building. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. In other words, the support structure for an equipment foundation according to the present invention comprises a steel-framed building, a reinforced concrete floor slab provided on the upper side of the building, and a steel-framed equipment foundation having steel pillars and whose lower parts are embedded in the floor slab, and the horizontal force acting during an earthquake is resisted by the horizontal force of the floor slab.

[0009] In the equipment foundation support structure constructed in this way, the steel columns of the equipment foundation can be constructed at the same time as the steel frame of the building is constructed. Therefore, by constructing both the building and the equipment foundation at the same time, construction time can be shortened compared to the conventional method of constructing the equipment foundation after the steel frame of the building is completed. In addition, since the horizontal force acting during an earthquake is resisted by the horizontal force of the floor slab, the main force acting on the building is the weight of the equipment foundation, and the stress acting on the building can be reduced.

[0010] In addition, in the support structure for equipment foundations according to the present invention, the support pillar may be placed on the upper side of either a steel column or a steel beam of the building.

[0011] In the support structure for the equipment foundation configured in this way, the support column is placed on the upper side of either the steel column or the steel beam of the building, so that either the steel beam or the steel beam of the building can support the support column and bear the weight of the equipment foundation.

[0012] In addition, in the support structure for equipment foundation according to the present invention, the lower part of the support column may be embedded in the floor slab.

[0013] In the equipment foundation support structure configured in this way, the lower part of the support pillar is embedded in the floor slab. Therefore, the support pillar is fixed to the concrete of the floor slab, and the building can stably support the equipment foundation.

[0014] In addition, the support structure for an equipment foundation according to the present invention may be such that the pillar is provided with a first joint portion protruding laterally and having a first bolt hole that is long in the vertical direction, and the steel beam of the building is provided with a second joint portion protruding upward and having a second bolt hole that is long in the vertical direction, and bolts having a diameter shorter than the vertical lengths of the first bolt hole and the second bolt hole are inserted into the first bolt hole and the second bolt hole and fastened to a nut.

[0015] In the equipment foundation support structure configured in this way, the vertical length of the first bolt hole of the first joint of the support pillar and the second bolt hole of the second joint of the building beam is longer than the diameter of the bolt inserted and fastened through the first bolt hole and the second bolt hole. Therefore, since the support pillar and the steel beam of the building are not tightly connected, the impact of horizontal forces acting during an earthquake on the building can be suppressed.

[0016] In addition, the construction method for equipment foundations according to the present invention involves constructing a steel-framed building, placing steel pillars on either the steel columns or steel beams of the building, pouring concrete to bury the lower parts of the pillars, and constructing a floor slab, which resists the horizontal force acting during an earthquake with the horizontal force of the floor slab.

[0017] In the equipment foundation construction method configured in this way, the steel pillars of the equipment foundation can be constructed at the same time as the steel frame of the building is constructed. Therefore, compared to the conventional method of constructing the equipment foundation after the steel frame of the building is completed, the construction period can be shortened by constructing both the building and the equipment foundation at the same time. In addition, since the horizontal force acting during an earthquake is resisted by the horizontal force of the floor slab, the main force acting on the building is the weight of the equipment foundation, and the stress acting on the building can be reduced. Effect of the Invention

[0018] According to the support structure for an equipment foundation and the construction method for an equipment foundation of the present invention, it is possible to reduce the stress acting on the building and shorten the construction period. [Brief description of the drawings]

[0019] [Figure 1] 1 is a plan view showing a schematic diagram of a support structure for an equipment foundation according to one embodiment of the present invention; [Diagram 2] FIG. 2 is an enlarged view of part II in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. [Diagram 5] 3 is a cross-sectional view taken along line VV in FIG. 2. [Figure 6] FIG. 5 is an enlarged view of a portion VI in FIG. [Figure 7] FIG. 2 is a diagram showing a joint structure between a support column and a beam of an equipment foundation in a support structure for an equipment foundation according to one embodiment of the present invention. [Figure 8] FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. [Figure 9] 9 is a cross-sectional view taken along line IX-IX in FIG. 7. [Figure 10] FIG. 1 is a moment diagram when a horizontal force is applied in a joint configuration between a column and a beam of an equipment foundation in a support structure for an equipment foundation according to one embodiment of the present invention. [Figure 11]10 is a diagram showing another example of a joint structure between a column of an equipment foundation and an equipment beam of a support structure for an equipment foundation according to one embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A support structure for an equipment foundation and a construction method for an equipment foundation according to one embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a plan view showing a schematic diagram of a support structure for a facility foundation according to an embodiment of the present invention, in which steel beams of a building are shown by dashed lines. The support structure for equipment foundation according to this embodiment is installed on a floor slab of a building roof, etc. As shown in FIG. 1, the support structure for equipment foundation 100 includes a building 1, a floor slab 2, and an equipment foundation 3.

[0021] In the following, the Z, X, and Y directions of the Cartesian coordinate system are defined as follows: the Z direction is the up-down direction, the X direction is the direction along the horizontal direction, and the Y direction is the direction along the horizontal direction and perpendicular to the X direction.

[0022] The building 1 is made of steel. The building 1 includes steel columns (not shown) and steel beams 12. The beams 12 extend in the X direction and are arranged at intervals in the Y direction. The beams 12 extend in the Y direction and are arranged at intervals in the X direction. The beams 12 extending in the X direction are perpendicular to the beams 12 extending in the Y direction. The beams 12 connect adjacent columns. The columns correspond to steel columns in the claims. The beams 12 correspond to steel beams in the claims.

[0023] Fig. 2 is an enlarged view of a part II in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 2. Fig. 5 is a cross-sectional view taken along line VV in Fig. 2. Fig. 6 is an enlarged view of a part VI in Fig. 4. In the illustrated example, the beam 12 is an H-shaped steel. As shown in FIG. 3, the beam 12 includes a beam-side upper flange 12a, a beam-side lower flange 12b, and a beam-side web 12c. The beam-side upper flange 12a is disposed above the beam-side lower flange 12b. The beam-side upper flange 12a and the beam-side lower flange 12b are formed in a plate shape. The plate surfaces of the beam-side upper flange 12a and the beam-side lower flange 12b face in the up-down direction. The beam-side web 12c connects the approximate center in the width direction of the beam-side upper flange 12a and the approximate center in the width direction of the beam-side lower flange 12b. The beam-side web 12c is formed in a plate shape. The plate surface of the beam-side web 12c faces in a direction perpendicular to the extension direction of the beam 12 and along the horizontal direction.

[0024] The floor slab 2 is made of reinforced concrete. The floor slab 2 includes concrete 21 and reinforcing bars (not shown) embedded in the concrete 21. The floor slab 2 is formed in a flat plate shape. The plate surface of the floor slab 2 faces the up-down direction.

[0025] The floor slab 2 is disposed on the upper side of the building 1. The floor slab 2 is disposed on the upper side of the beam-side upper flange 12a of the beam 12. The beam 12 and the concrete 21 are fixed together by upwardly facing protrusions such as stud bolts provided on the beam-side upper flange 12a being fixed to the concrete 21 of the floor slab 2.

[0026] As shown in Fig. 4, the beam side upper flange 12a of the floor slab 2 is provided with a beam side joint plate 13 protruding upward. The beam side joint plate 13 is made of metal. The beam side joint plate 13 is joined to the beam side upper flange 12a by welding or the like. The beam side joint plate 13 is provided on both sides in the X direction and both sides in the Y direction on the outer side of the support 31 described later. The beam side joint plate 13 corresponds to the second joint portion in the claims.

[0027] The beam side joint plate 13 is formed in a plate shape. The plate surfaces of the beam side joint plates 13 arranged on both sides of the outer side of the column 31 in the Y direction face the X direction. The plate surfaces of the beam side joint plates 13 arranged on both sides of the outer side of the column 31 in the X direction face the Y direction.

[0028] As shown in Fig. 6, a bolt hole 13a that is a long hole that is long in the vertical direction is formed in the beam side joint plate 13. The bolt hole 13a is formed so as to penetrate the beam side joint plate 13 in the plate thickness direction. The bolt hole 13a corresponds to a second bolt hole in the claims.

[0029] The equipment foundation 3 is a steel frame structure. As shown in FIG.

[0030] The pillars 31 are made of steel. The pillars 31 may be steel pipes. At least in the top floor of the building 1, which is disposed below the floor slab 2, the beams 12 or columns (not shown) are disposed directly below the pillars 31. In other words, the pillars 31 are disposed directly above the beams 12 or columns (not shown) of the top floor of the building 1. In the illustrated example shown in FIG. 1, the pillars 31 are disposed directly above the beams 12. Directly above means vertically above, and other members such as the floor slab 2 may be disposed between the beams 12 and the columns 31. A plurality of pillars 31 are disposed at intervals in the X and Y directions.

[0031] 2, in this embodiment, the support pillar 31 is an H-shaped steel beam. The support pillar 31 may be made of any material other than steel, and may be made of a steel pipe.

[0032] The support pillar 31 extends in the vertical direction. The support pillar 31 includes a first equipment flange 31a, a second equipment flange 31b, and an equipment web 31c. The first equipment flange 31a and the second equipment flange 31b are arranged apart in the Y direction. The first equipment flange 31a and the second equipment flange 31b are formed in a plate shape. The plate surface of the first equipment flange 31a and the plate surface of the second equipment flange 31b face the Y direction. The equipment web 31c connects the approximate center in the width direction of the first equipment flange 31a and the approximate center in the width direction of the second equipment flange 31b. The equipment web 31c is formed in a plate shape. The plate surface of the equipment web 31c faces the X direction.

[0033] As shown in Fig. 3, a base plate 34 is provided at the lower end of the support 31. The base plate 34 is made of metal. The base plate 34 is fixed to the lower end of the support 31 by welding or the like. As shown in Fig. 2, in a plan view, the base plate 34 is a substantially rectangular member that is larger than the support 31. The plate surface of the base plate 34 faces the up-down direction.

[0034] The lower part of the equipment foundation 3 is embedded in the concrete 21 of the floor slab 2. The lower parts of the base plate 34 and the pillars 31 of the equipment foundation 3 are embedded in the concrete 21.

[0035] As shown in Fig. 4, an equipment-side joint plate 33 protruding laterally is provided at approximately the center in the width direction of the equipment-side first flange 31a, the equipment-side second flange 31b, and the equipment-side web 31c of the support 31. In the illustrated example shown in Fig. 4, the equipment-side joint plate 33 provided on the equipment-side first flange 31a and the equipment-side second flange 31b is shown. The equipment-side joint plate 33 is made of metal. The equipment-side joint plate 33 is fixed to the equipment-side first flange 31a, the equipment-side second flange 31b, and the equipment-side web 31c by welding or the like. The equipment-side joint plate 33 corresponds to the first joint portion in the claims.

[0036] The equipment-side joint plate 33 is formed in a plate shape. The equipment-side joint plate 33 arranged on both sides of the outer side of the support 31 in the Y direction has a plate surface facing the X direction. The equipment-side joint plate 33 arranged on both sides of the outer side of the support 31 in the X direction has a plate surface facing the Y direction.

[0037] As shown in Fig. 6, bolt holes 33a that are elongated holes extending in the vertical direction are formed in the equipment-side joint plate 33. The bolt holes 33a are formed so as to penetrate the equipment-side joint plate 33 in the plate thickness direction. The bolt holes 33a correspond to the first bolt holes in the claims.

[0038] The equipment-side joint plate 33 is disposed adjacent to the beam-side joint plate 13 provided on the beam 12. The bolt 35 is inserted through the bolt hole 33a of the equipment-side joint plate 33 and the bolt hole 13a of the beam-side joint plate 13, and fastened to the nut 36.

[0039] The diameter A1 of the shaft portion 35a of the bolt 35 inserted into the bolt hole 33a and the bolt hole 13a is shorter than the length A2 in the vertical direction of the bolt hole 33a and the bolt hole 13a. In FIG. 6, the head of the bolt 35 and the nut 36 are shown by a two-dot chain line so that the diameter A of the shaft portion 35a and the length A2 in the vertical direction of the bolt hole 33a and the bolt hole 13a can be seen. The equipment side joint plate 33 and the beam side joint plate 13 are temporarily fixed by the bolt 35 and the nut 36 so as to be movable and rotatable in the vertical direction. By temporarily fixing them, the horizontal positional deviation of the support 31 is suppressed when the concrete 21 of the floor slab 2 is poured. When the concrete 21 of the floor slab 2 is poured, the lower part of the support 31, the equipment side joint plate 33 and the beam side joint plate 13 are embedded in the concrete 21, and the lower part of the support 31 is fixed to the concrete 21, so that the support 31 does not move upward.

[0040] The equipment side joint plate 33 and the beam side joint plate 13 are temporarily fixed with bolts 35 and nuts 36 so that they can move up and down and rotate, and the lower part of the support pillar 31 is embedded in the concrete 21 of the floor slab 2. When the concrete 21 of the floor slab 2 hardens, no reaction force is generated in the bolt 35. The lower part of the support pillar 31 and the beam 12 of the building 1 are connected by a pin. As a result, only the vertical force of the equipment foundation 3 acts on the columns and beams 12 of the building 1, and the horizontal force acting on the equipment foundation 3 during an earthquake is resisted by the horizontal force of the floor slab 2.

[0041] As shown in FIG. 1, the facility beam 32 connects adjacent supports 31 in the X and Y directions.

[0042] Next, the joint structure between the support column 31 and the facility beam 32 will be described. Fig. 7 is a diagram showing a joint structure between a support column 31 and a facility beam 32. Fig. 8 is a cross-sectional view taken along line VIII-VIII in Fig. 7. Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 7. 7 to 9, the facility beam 32 is an H-shaped steel. The support pillar 31 and the facility beam 32 are joined via a diaphragm (not shown). The support pillar 31 and the facility beam 32 are rigidly joined.

[0043] As shown in Fig. 7, a joint plate 41 is provided between the upper and lower supports 31. The upper end of the lower support 31 and the lower end of the upper support 31 are each fixed to the joint plate 41. As shown in Fig. 8, the joint plate 41 is a member that is generally rectangular in plan view. The joint plate 41 is formed in a plate shape. The plate surface of the joint plate 41 faces the up-down direction.

[0044] As shown in FIG. 7, a waterproof sheet 42 is provided below the joint plate 41 and above the floor slab 2. As shown in FIG. 9, the waterproof sheet 42 is stretched between one end of the equipment side first flange 31a in the X direction and one end of the equipment side second flange 31b in the X direction. The waterproof sheet 42 is stretched between the other end of the equipment side first flange 31a in the X direction and the other end of the equipment side second flange 31b in the X direction. The length of the waterproof sheet 42 in the vertical direction is, for example, about 300 mm. The waterproof sheet 42 may be stretched up to the lower side of the equipment beam 32.

[0045] As shown in Fig. 7, a joint B1 between the column 31 and the floor slab 2 is a pin joint. A joint B2 between the column 31 and the facility beam 32 is a rigid joint. Fig. 10 shows a moment diagram when a horizontal force is applied.

[0046] Next, another joint structure between the support column 31 and the facility beam 32 will be described. Fig. 11 is a diagram showing another joint structure between a support column 31 and a facility beam 32. The same components as those in the joint structure shown in Fig. 7 are given the same reference numerals and the description thereof will be omitted. 11, the support column 31 and the facility beam 32 are joined via a joint 44 joined with a bolt and a nut. The support column 31 and the facility beam 32 are joined by a pin.

[0047] The equipment beam 32 is provided with a beam-side joint plate 45 so as to protrude downward. In the support 31, a support-side convenient plate 46 is provided in a portion above the joint plate 41 so as to protrude in the Y direction. A diagonal member 47 is installed between the beam-side joint plate 45 and the support-side convenient plate 46. The diagonal member 47 is inclined in the vertical direction so as to gradually move away from the support 31 as it goes upward. The upper end of the diagonal member 47 and the beam-side joint plate 45 are joined via a joint 48 joined with a bolt and a nut. The lower end of the diagonal member 47 and the support-side convenient plate 46 are joined via a joint 49 joined with a bolt and a nut. The diagonal member 47 and the support 31, and the diagonal member 47 and the equipment beam 32 are pin-jointed. By installing the diagonal member 47, the support 31 and the equipment beam 32 as a whole form a column head rigid frame.

[0048] Next, the construction method for the equipment foundation will be described. A steel-framed building 1 is constructed. After the building 1 is constructed, a support pillar 31 is installed on the upper side of the steel columns or beams 12 of the building 1. An equipment beam 32 may be fixed to the support pillar 31 in advance, and an equipment foundation 3 in which the support pillar 31 and the equipment beam 32 are assembled may be installed. Alternatively, the equipment beam 32 may be joined to the support pillar 31 after the support pillar 31 is installed. The lower part of the support pillar 31 is temporarily fixed to the beam 12 with a bolt 35 and a nut 36.

[0049] After the reinforcement is arranged and the formwork is set, concrete 21 is poured to construct the floor slab 2. The lower parts of the supports 31 are embedded in the concrete 21.

[0050] In the equipment foundation support structure 100 configured in this manner, the H-shaped steel pillars 31 of the equipment foundation 3 can be constructed at the same time as the steel frame of the building 1. Therefore, by constructing both the building 1 and the equipment foundation 3 at the same time, construction time can be shortened compared to the conventional method of building the equipment foundation after the steel frame of the building is completed.

[0051] In addition, since the horizontal force acting during an earthquake is resisted by the horizontal force of the floor slab 2, the main force acting on the building 1 is the weight of the equipment foundation 3, and the stress acting on the building 1 can be suppressed.

[0052] Moreover, the support pillars 31 are placed on the upper side of the H-shaped steel beams 12 of the building 1. Therefore, the beams 12 support the support pillars 31 and can bear the weight of the equipment foundation 3 itself.

[0053] Furthermore, the lower portion of the support pillar 31 is embedded in the floor slab 2. Therefore, the support pillar 31 is fixed to the concrete 21 of the floor slab 2, and the building 1 can stably support the facility foundation 3.

[0054] Furthermore, the vertical length of the bolt hole 33a of the facility-side joint plate 33 of the support 31 and the bolt hole 13a of the beam-side joint plate 13 of the beam 12 of the building 1 is longer than the diameter of the bolt 35 inserted through the bolt hole 33a and the bolt hole 13a and fastened. Therefore, since the support 31 and the beam of the building 1 are not tightly connected, it is possible to suppress the horizontal force acting during an earthquake from acting on the building 1 side.

[0055] In addition, since the weight of the equipment foundation 3 is the main load on the building 1, there is no need to consider the horizontal force acting on the equipment foundation 3 during an earthquake when designing the building 1. Therefore, the equipment foundation 3 can be installed in a desired position, allowing for flexible response.

[0056] The assembly procedures, shapes and combinations of the components, etc. shown in the above-described embodiment are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present invention.

[0057] For example, in the embodiment described above, the pillars 31 are placed on the upper side of the H-shaped steel beams 12 of the building 1, but this is not limited thereto. The pillars 31 may be placed on the upper side of a structural member of the building 1, such as a steel column.

[0058] In the embodiment described above, the vertical length of the bolt hole 33a of the facility-side joint plate 33 of the support 31 and the bolt hole 13a of the beam-side joint plate 13 of the beam 12 of the building 1 is set longer than the diameter of the bolt 35 inserted and fastened through the bolt hole 33a and the bolt hole 13a, so that the support 31 and the beam 12 of the building 1 are not tightly fastened, but the present invention is not limited to this. For example, the support 31 may be fitted into the beam 12 of the building 1 so that the horizontal force acting on the building 1 during an earthquake can be suppressed.

[0059] Furthermore, in the case where the support pillars are formed of steel pipes, through holes may be formed in the lower part of the support pillars so that the concrete 21 of the floor slab 2 is filled inside the lower part of the support pillars. [Explanation of symbols]

[0060] 1. Building 2 Floor slab 3. Equipment Basics 12 Beam (steel beam) 13 Beam side joint plate (second joint) 13a Bolt hole (second bolt hole) 31 Post 33a Bolt hole (first bolt hole) 33 Equipment side joint plate (first joint) 35 Volts 36 Nut 100 Support structure for equipment foundation

Claims

1. Steel-framed buildings and A reinforced concrete floor slab provided on the upper side of the building; A steel-framed equipment foundation having a support column formed of steel material and a lower portion embedded in the floor slab; A support structure for equipment foundations that resists horizontal forces acting during earthquakes with the horizontal force of the floor slab.

2. The support structure for an equipment foundation according to claim 1 , wherein the support pillar is placed on the upper side of either a steel column or a steel beam of the building.

3. The support structure for an equipment foundation according to claim 1 or 2, wherein the lower part of the support column is embedded in the floor slab.

4. The support pillar is provided with a first joint portion that protrudes laterally and has a first bolt hole that is long in the vertical direction. The steel beam of the building is provided with a second joint portion that protrudes upward and has a second bolt hole that is long in the vertical direction, 3. A support structure for an equipment foundation as described in claim 1 or 2, wherein a bolt having a diameter shorter than the vertical length of the first bolt hole and the second bolt hole is inserted through the first bolt hole and the second bolt hole and fastened to a nut.

5. Constructing a steel-framed building A support pillar made of steel is placed on the top of either the steel column or the steel beam of the building, Pour concrete so as to bury the lower part of the support pillar to construct a floor slab; A construction method for equipment foundations in which the horizontal force acting during an earthquake is resisted by the horizontal force of the floor slab.

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