JP2016205073A - Foundation at peripheral part of steel frame building, and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foundation at a peripheral part of a steel frame building that saves labor and curtails construction period at the construction site and enhances quality.SOLUTION: A foundation comprises: a reinforced concrete pressure bearing plate 1 installed on an excavated bottom surface at a prescribed depth from a ground surface; a plurality of columns 2, 2 erected on the pressure bearing plate 1 at a constant interval; a plurality of underground beams 3 installed on the pressure bearing plate 1 between each of the columns 2, 2; and a spandrel wall 5 installed on an outdoor side of the underground beam 3 and the column 2. The spandrel wall 5 comprises a framework 11 behind the spandrel wall fitted on the outdoor side of the underground beam 3 and the column 2 to a prescribed height from the ground surface, and two fiber-reinforced cement plates 12 overlapped and screwed on an outer side of the framework 11 behind the spandrel wall.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a foundation for an outer peripheral portion of a steel building and a construction method for the steel building by using a steel underground beam and a dry waist wall, and enables labor saving of construction work, shortening of a construction period, and improvement of quality.

  Buildings that require a relatively large indoor space such as factories, warehouses, hangars, etc. are generally constructed with a steel structure in which the main parts such as columns and beams are made of steel materials such as H-shaped steel, and at the bottom of each column In each case, an independent foundation of RC structure that supports the upper load is arranged for each column, and an underground beam (foundation beam) of the RC structure is often arranged between each foundation.

  In addition, the outer wall needs to be protected from fire, dirt and deterioration due to long-term sunlight, wind and rain, etc., so it is constructed by attaching an incombustible exterior material such as an ALC plate to the outdoor side of the steel frame.

  Further, in particular, the waist wall up to a certain height from the ground surface (for example, under the window) is generally cast-in-place concrete integrally with the foundation 30, the underground beam 31 and the first floor slab 32 as shown in FIG. It is constructed by RC structure. In the figure, reference numeral 33 denotes a waist wall.

  Moreover, it may be constructed by a steel-framed underground beam and a dry waist wall. For example, in Patent Document 1, a plurality of independent concrete members are laid at intervals in a building girder direction and a wife direction, respectively. A basic structure of a building constructed by bridging an H-shaped steel beam between the independent concrete members and attaching a decorative cover to the outdoor side of the H-shaped steel beam and the independent concrete member is disclosed.

Patent Document 1 Japanese Patent Application Laid-Open No. 2015-30996 Patent Document 2 Japanese Patent Application Laid-Open No. 2013-83062 Patent Document 3 Japanese Patent Application Laid-Open No. 07-305338 Japanese Patent Application Laid-Open No. 07-158101

  However, the foundation of RC structures using cast-in-place concrete involves a lot of on-site work, such as installation of formwork, processing and arrangement of reinforcing bars, further curing, dismantling and removal of formwork. There was a problem that the construction period was unavoidable.

  In addition, installation of formwork, dismantling and removal, rebar processing, and bar arrangement are all performed by skilled craftsmen, but it is difficult to arrange each year due to aging. In addition, the contents of the work tend to vary in quality and quickness depending on the skill of each craftsman, and it is difficult to always seek high quality and short-term construction.

  Further, in the building basic structure disclosed in Patent Document 1, the decorative cover is a single siding material or the like. For this reason, the decorative cover is only partially fixed to the H-shaped steel beam by a mounting bracket as shown in FIG. However, there is a big problem not only in strength but also in fire protection.

  The present invention was made to solve the above problems, and in particular, by constructing the waist wall by attaching a plurality of fiber reinforced cement plates to the lower wall of the waist wall, labor saving on site construction and shortening the construction period, etc. It aims at providing the foundation of the outer peripheral part of the steel-frame building which enabled it, and its construction method.

  The present invention relates to a pressure-resistant plate of RC structure constructed on the bottom of excavation at a predetermined depth from the ground surface, a plurality of steel columns erected at regular intervals on the pressure-resistant plate, and between each steel column The outer periphery of a steel building comprising a plurality of steel underground beams laid on a pressure-resistant plate and a waist wall installed over a predetermined height from the ground surface on the outdoor side of the steel underground beams and the steel columns In particular, the waist wall is composed of a plurality of trunk edges and crosspieces on the outdoor side of the steel underground beam and steel column, and is attached to a predetermined height from the ground surface. And a plurality of fiber-reinforced cement boards attached to the outdoor side of the lower waist wall shaft.

  An RC structure foundation footing may be installed in place of the pressure plate. In this case, the RC structure foundation footings are arranged on the bottom surface of the excavation at a predetermined depth from the ground surface, and spaced above each foundation footing. A steel column may be erected, a steel underground beam may be installed between the steel columns, and a waist wall may be installed on the outdoor side of the steel underground beam and the steel column.

  In any case, it is preferable that the lower end of the lower wall of the waist wall and the lower end portion of the fiber reinforced cement plate are installed in the ground in preparation for the runoff due to rain water or the like on the front ground.

  In addition, the steel lower shaft assembly is assembled in advance to a size that can be handled manually by a work yard, etc., and then installed on the outdoor side of the steel underground beam and steel column to efficiently install the steel lower shaft assembly. It can be carried out. Lightweight steel such as lightweight square steel pipe, lightweight grooved steel, lightweight angle steel, etc. can be used for the shaft material of the lower wall of the waist wall, and these members must be connected to each other by welding or screwing together. The fiber reinforced cement that can be easily assembled with the lower shaft of the waist wall is a cement board such as fiber-mixed extrusion cement, and is formed to a size that can be handled by human power. By attaching it, it is possible to give predetermined fire resistance and strength. Furthermore, the fiber reinforced cement board can be easily fixed to the lower shaft of the waist wall by screws.

As an example of fiber reinforced cement board, for example, composition: cement 49.3 (± 4.9) mass%, siliceous raw material 34.2 (± 3.4) mass%, inorganic admixture 11.0 (± 1.1) mass%, organic admixture 4.4 (± 0.5) mass%, methylcellulose 1.1 (± 0.1) mass%, density: 1.25 (± 0.13) g / cm ³ , plate thickness: 30 (-2, +3) mm can do.

  According to the present invention, in particular, the waist wall is overlapped on the outdoor side of the lower wall of the waist wall and the lower wall of the waist wall attached to the outdoor side of the steel underground beam and the steel column over a predetermined height from the ground surface. By installing multiple fiber-reinforced cement boards attached, the installation of concrete molds for conventional waist wall construction, removal work, rebar processing, and on-site work such as bar arrangements can be omitted. it can.

  In addition, this makes it possible to save labor on site and greatly shorten the construction period, and further eliminates the need for arrangement of formwork and reinforcing bar.

  Further, the fiber reinforced cement is formed in a size that can be handled by human power, and has good workability because it can be easily fixed to the lower waist wall shaft assembly by screws. In addition, since at least two fiber-reinforced cement boards are attached in a stacked manner, necessary fire resistance and strength can be provided.

It is a longitudinal cross-sectional view which shows the outer peripheral part of the direct foundation of the steel-frame building provided with the steel-frame underground beam and the waist wall. It is a partial perspective view which shows the structure of a waist wall. FIG. 3 (a) is a partial longitudinal sectional view of the structure of the waist wall, and FIG. 3 (b) is a partial horizontal sectional view thereof. It is a longitudinal cross-sectional view which shows the foundation footing of the outer peripheral part of the steel-frame building provided with the steel-frame underground beam and the waist wall. It is a longitudinal cross-sectional view which shows the foundation of the outer peripheral part of the conventional steel building provided with the underground beam and waist wall of RC structure.

  1 to 3 illustrate the foundation of the outer periphery of a steel building such as a factory or a warehouse, and a square is formed at the periphery of a pressure-resistant plate (solid foundation or direct foundation) 1 of a reinforced concrete (hereinafter “RC”) structure. A plurality of steel columns (hereinafter referred to as “columns”) 2 made of steel pipes are erected at regular intervals in the girder direction and the span direction.

  In addition, a steel underground beam (hereinafter referred to as “underground beam”) 3 made of H-shaped steel is laid on the pressure plate 1 between the pillars 2 and 2. On the outdoor side and on the outdoor side of the column 2, the discarded mold 4, the waist wall 5 and the outer wall 6 are adjacent to each other from the upper surface of the discarded concrete 9, which will be described later, to the upper side of the column 2 and continuously in the circumferential direction of the pressure plate 1. is set up.

  In addition, a floor slab 7 having an RC structure is installed between the underground beams 3 and 3, and the underground wall 8 is connected to the pressure-resistant plate 1 and the floor slab 7 between the discarded formwork 4 and the waist wall 5 and the underground beam 3. It is constructed in one piece.

  The pressure plate 1 is constructed by RC structure with cast-in-place concrete on abandoned concrete 9 placed horizontally on the cracked stones spread on the bottom of excavation at a predetermined depth from the ground surface, especially in cold regions Is constructed deeper than the freezing depth in preparation for frost damage.

  The lower end of each column 2 is integrally fixed on the pressure plate 1 by a plurality of foot brackets (not shown) such as anchor bolts. Are joined together by welding or a joint metal such as a joint plate and joint bolts (not shown), and the lower ends of the intermediate beams 3 are fixed integrally to the pressure plate 1 by a plurality of anchor bolts 10.

The discard mold 4 is a concrete mold for constructing the pressure-resistant plate 1, and is constructed by building a corrugated steel plate such as a keystone plate on the discard concrete 9.
The discard form 4 is installed before the concrete of the pressure plate 1 is placed.

  The discarded mold 4 is constructed at a height from the upper surface of the discarded concrete 9 to the vicinity of the middle part of the underground beam 3, the lower end is disposed on the concrete 9, and the upper end is described later on the waist wall 5. The lower wall edge 11b of the lower waist wall shaft 11 is fixed by screws.

  The waist wall 5 is an outer wall that is constructed to a certain height (for example, under the window) from the ground surface in order to prevent fire, dirt and deterioration due to long-term sunlight, wind and rain, and the like. It is constructed by stacking and attaching two fiber-reinforced cement boards 12 on the outdoor side of the lower waist wall shaft assembly 11 assembled from the lower part to the lower end part of the column 2.

  In addition, the lower end of the waist wall 5 is extended continuously into the ground up to the upper end of the disposal form 4 below the ground surface in preparation for the runoff of the front ground due to rain water, etc. Yes.

  The lower wall 11 of the waist wall 11 has an upper trunk edge 11a and a lower trunk that are horizontally spanned in the axial direction of the underground beam 3 on the outdoor side of the underground beam 3 and on the outdoor side of the lower ends of the columns 2 and 2, respectively. A plurality of vertical bars 11c assembled at regular intervals in the axial direction of the upper and lower trunk edges 11a and 11b between the edge 11b and the upper and lower trunk edges 11a and 11b in a lattice frame shape that is long in the axial direction of the underground beam 2 It is assembled.

  In the waist wall shaft assembly 11, one or a plurality of middle waist edges 11d may be assembled between the upper and lower waist edges 11a and 11b depending on the height of the waist wall 5 (see FIG. 2). The lower wall 11 of the waist wall is assembled to a size that can be handled by human power, and the upper and lower waist edges 11a, 11b and the vertical beam 11c are made of lightweight square steel pipe and lightweight L-shaped steel or lightweight angle steel, respectively. Are connected to each other by screws or welding.

  The lower wall 11 of the lower wall 11 assembled in this way is screwed to the bracket 13 protruding from the side of the web of the underground beam 2 and the middle part is attached to the upper flange of the underground beam 2 The fixed runner or bracket 14 is fixed by screwing or welding.

  The fiber-reinforced cement board 12 is formed from a cement board such as a fiber-mixed extruded cement board, is sized to be handled by human power, and meets at least a predetermined fire resistance standard and strength by attaching at least two sheets. Is formed. The upper and lower ends are fixed to the upper and lower trunk edges 11a and 11b of the lower waist wall shaft 11 by screws.

  The outer wall 6 is constructed by installing a plurality of outer wall panels such as ALC plates adjacent to each other in the axial direction of the underground beam 3 on the outdoor side of the columns 2 and 2, and in particular, the lower end of each outer wall panel is a waist wall The upper shaft 11 is fixed to the upper side of the upper trunk edge 11b. A drainer 15 formed of a metal plate or the like is attached between the outer wall 6 and the waist wall 5.

  The floor slab 7 is constructed by laying a discarded form 16 made of corrugated steel plate such as a deck plate between the underground beams 3 and 3 facing each other in parallel, arranging a wire mesh or a reinforcing bar 7a thereon, and placing concrete 7b. It is constructed by placing.

  In particular, the underground wall 8 is constructed by continuously placing the concrete 7b between the underground beam 2 and the disposal form 4 and the waist wall 5. By constructing the underground wall 8 at this position, the waist wall 5 can be integrated with the underground beam 3 in particular, thereby improving the strength of the waist wall 5 and increasing the strength of the entire foundation. it can.

  Next, the construction procedure will be described in such a configuration.

(1) First, a crushed stone is laid on the bottom of the excavated excavated to a predetermined depth, the discarded concrete 9 is horizontally placed thereon, and the reinforcing bar 1a of the pressure plate 1 is arranged thereon.

(2) Next, anchor bolts (not shown) such as anchor bolts for fixing the lower end of each pillar 2 are installed at the position where the pillars 2 are built, and underground beams are installed between the pillar legs. 3 is laid. In particular, by placing the underground beam 3 so as to float from the reinforcing bar 1a of the pressure plate 1, the thickness of the concrete 1b of the pressure plate 1 to be placed later is sufficiently secured. In addition, a plurality of anchors 10 are projected in advance on the lower end surface of the underground beam 2.

(3) Next, the lower wall frame 11 is attached to the outdoor side of the underground beam 3, and the discarded form 4 is installed between the lower wall frame 11 and the discarded concrete 9. The lower wall 11 of the waist wall 11 can be efficiently operated by mounting it on the outdoor side of the underground beam 3 after having previously set it to an appropriate size.

  The discarded form 4 is built on the discarded concrete 9, the lower end is discarded and fixed on the concrete 9 with a runner 4a, and the upper end is screwed to the lower trunk edge 11b of the lower waist wall frame 11 And fix.

(4) Next, the concrete 1b is placed in the disposal form 4. The concrete 1b is cast to the lower end surface of the lower flange of the underground beam 2 and sufficiently cured.

(5) When the concrete 1b of the pressure plate 1 develops sufficient strength, each column 2 is installed, and the lower end of the concrete plate 1b is placed on the pressure plate 1 and the pillars such as anchor bolts protruding in advance on the pressure plate 1 It is fixed integrally with the leg hardware. Further, both end portions of the middle beams 3 are integrally joined to the lower end portions of the columns 2 and 2.

(6) Next, a discarded form 16 made of a corrugated steel plate such as a deck plate is laid between the underground beams 3 and 3, and a floor reinforcing bar 7a is placed thereon. In addition, the waist wall 5 is constructed by attaching two fiber-reinforced cement boards 12 on the outdoor side of the waist wall lower shaft group 11 so as to overlap each other.

  The fiber-reinforced cement board 12 can be securely fixed by screwing it to the upper and lower trunk edges 11a and 11b of the lower waist wall shaft 11 one by one. In addition, a water seal between the panels is achieved by interposing a joint member or a sealing material between the adjacent panels 12, 12 or forming a joint (see 3 (a), (b)).

(7) Next, the concrete slab 7 is placed on the floor disposal form 16 to construct the floor slab 7. At the same time, the concrete wall 8 is constructed by placing concrete between the underground beam 3 and the discarded formwork 4 and the waist wall 5. The foundation construction is completed by the above construction procedure. When the foundation construction is completed, the outer wall 6 is constructed on the waist wall 5 using an ALC plate or the like.

  FIG. 4 illustrates another embodiment of the present invention, in which a foundation footing 18 supported by a foundation pile 17 is disposed on a discarded concrete 9 placed on an excavation bottom surface having a predetermined depth from the ground surface. Are laid at regular intervals in the direction of the girder and the direction of the wife.

  The upper end surface of each foundation footing 18 is constructed to be almost flush with the upper surface of the discarded concrete 9, and the pillar 2 is built on the upper end portion of each foundation footing 18. Each beam 3 is installed.

  In addition, on the outdoor side of the underground beam 3 and the column 2, the discarded form 19, the waist wall 5 and the outer wall 6 are adjacent to each other above the foundation footing 18 and the discarded concrete 9, and are continuous in the circumferential direction of the underground beam 2. Installed.

  In addition, a floor slab 7 having an RC structure is installed between the underground beams 3 and 3, and the underground wall 8 is constructed between the discarded formwork 19 and the waist wall 5 and the underground beam 3.

  The foundation footing 18 is integrated with the foundation pile 17 by placing foundation reinforcement bars (not shown) in the discarded mold 20 installed around the head 17a of the foundation pile 17 and placing concrete 18a. It is being constructed.

  In addition, a plurality of anchor bolts 21 and 21 having a level adjusting function are provided at the upper end of each foundation footing 18 so as to project. And the lower end part of each pillar 2 is integrally fixed to the upper end part of the foundation footing 18 by a plurality of anchor bolts 21, 21. Further, both end portions of the middle beam 3 are integrally joined to the lower end portions of the columns 2 and 2 by welding or a joint metal (not shown) such as a joint plate or a joint bolt.

  The discarded formwork 19 is a concrete formwork for constructing the underground wall 8 and is constructed by building corrugated steel plates such as keystone plates on the upper surfaces of the discarded concrete 9 and the foundation footing 18. The discarded mold 19 is constructed at a height from the upper end surface of the discarded concrete 9 and the foundation footing 18 to almost the middle part of the underground beam 3, and the lower end is disposed on the discarded concrete 9 and the foundation footing 18. The upper end portion is fixed to the waist wall lower shaft set 11 of the waist wall 5 by screws.

  The waist wall 5 is constructed by stacking and attaching two fiber-reinforced cement boards 12 on the outdoor side of the waist wall lower shaft assembly 11 assembled from the upper end portion of the discarded mold 19 to the lower end portion of the column 2. .

  In addition, the lower end of the waist wall 5 is installed in the ground up to the upper end of the discarded formwork 19 below the ground surface and is continuously constructed with the discarded formwork 19 in preparation for the runoff due to rain water etc. on the front ground. Yes.

  The lower wall 11 of the waist wall 11 includes upper and lower trunk edges 11a, which are horizontally extended in the axial direction of the underground beam 3 on the outdoor side of the underground beam 3 and on the outdoor side of the lower ends of the columns 2 and 2, respectively. 11b and a middle trunk edge 11d and a plurality of vertical bars 11c assembled between the respective trunk edges 11a, 11c and 11c, 11b are assembled in a lattice frame shape that is long in the axial direction of the underground beam 3. .

  The waist wall lower shaft assembly 11 assembled in this way is fixed to a stiffener 22 attached to the side portion of the underground beam 3 via a plurality of brackets 23. Then, two fiber reinforced cement boards 12 are fixed on the lower wall lower shaft 11 and attached to the outdoor side of the columns 2 and 2 by attaching a plurality of outer wall panels such as ALC boards. An outer wall 6 is constructed.

  In addition, the construction method of the said embodiment is substantially the same as the construction method of embodiment described in FIGS.

  The present invention can be applied in a short period of time and efficiently without the use of a skilled formwork and reinforcing bar for the foundation of the outer periphery of a steel building.

1 Pressure-resistant plate 2 Column (steel column)
3 Underground beam (steel frame underground beam)
4 Discarding form 5 Waist wall 6 Outer wall 7 Floor slab 8 Rigid wall 9 Abandoned concrete
10 Anchor bolt
11 Waist wall lower shaft
11a Upper trunk edge (trunk material)
11b Lower waist edge (body edge material)
11c Vertical beam (bar material)
12 Fiber reinforced cement board
13 Bracket
14 Bracket
15 Drainer
16 Abandoned formwork
17 Foundation pile
18 Basic footing
19 Abandoned formwork
20 Abandoned formwork
21 Anchor bolt
22 Stiffener
23 Bracket

Claims (5)

  An RC structure pressure plate installed on the bottom of the excavation at a predetermined depth from the ground surface, a plurality of steel columns erected on the pressure plate at regular intervals, and a pressure plate between the steel columns In the foundation of the outer periphery of a steel building comprising a plurality of steel underground beams laid on the outer surface of the steel building and a waist wall installed over a predetermined height from the ground surface on the outdoor side of the steel underground beams and the steel columns The waist wall is composed of a plurality of torso materials and crosspieces on the outdoor side of the steel underground beam and steel column, and is attached to the lower wall of the waist wall over a predetermined height from the ground surface. The foundation of the outer peripheral part of the steel-frame building characterized by being comprised from the some fiber reinforced cement board piled up and attached to the outdoor side of the said waist wall lower axis | shaft group.   R / C foundation footings constructed at an interval from the ground surface to the bottom of the excavation at a predetermined depth, a plurality of steel columns standing on the foundation footings, and spanned between the steel columns In the foundation of the outer peripheral part of the steel building comprising a plurality of steel underground beams and a waist wall installed on the outdoor side of the steel underground beam and the steel column over a predetermined height from the ground surface, the waist wall is A waist wall lower shaft set composed of a plurality of trunk edges and crosspieces and attached to a predetermined height from the ground surface on the outdoor side of the steel underground beam and steel column, and the lower wall shaft of the waist wall The foundation of the outer peripheral part of the steel-frame building characterized by being comprised from the some fiber reinforced cement board piled up and attached to the outdoor side of a group.   In the foundation of the outer peripheral part of the steel building according to claim 1 or 2, the lower end part of the lower wall of the waist wall and the lower end part of the waist wall panel is extended and attached in the ground. Basic.   In the foundation of the outer peripheral part of the steel building as described in any one of Claims 1-3, a fiber reinforced cement board is formed in the magnitude | size which can be handled by human power from a fiber mixing extrusion molding board, and at least 2 fiber reinforcement The foundation of the outer periphery of a steel building, characterized in that a cement board is mounted on the lower shaft of the waist wall with screws.   An RC structure pressure plate installed on the bottom of the excavation at a predetermined depth from the ground surface, a plurality of steel columns erected on the pressure plate at regular intervals, and a pressure plate between the steel columns In the construction method of the foundation of the outer periphery of the steel building comprising a plurality of steel underground beams laid on the outer wall and a waist wall installed on the outdoor side of the steel underground beams and the steel column, the pressure plate, the steel column After the construction of the steel frame underground beam, the lower wall of the waist wall composed of a plurality of trunk edges and crosspieces is placed at a predetermined height above the ground surface on the outdoor side of the steel beam underground beam and the lower end of the steel column. The construction method of the foundation of the outer periphery of a steel building is characterized in that at least two fiber-reinforced cement boards are piled on the outdoor side of the lower wall of the lower wall frame and fixed with screws.

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