JP2002235375A - Construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce construction cost of a post by using a pile as a column, to shorten a construction period of time by a period for building the foundation since the column and the pile can be built at the same time, errors in work can be easily adjusted, and then even the building with plural floors can be constructed. SOLUTION: A precast column 13 is directly jointed to a precast pile and erected, a supporting plate 16 is provided for this precast pile 13, a joint steel pipe 19 projected out with a bracket 18 with an outer diaphragm is placed on the top of the supporting plate 16 and fitted to a column to beam joint portion 15 of the column, a steel beam 22 is connected to a bracket 18 with the outer diaphragm, and grout 23 is placed to a gap 21 between the joint steel pipe 19 and the precast column 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a building, and more particularly to a method of constructing a frame using columns directly connected to piles.

[0002]

2. Description of the Related Art In the construction of a frame of a building supported by piles, a pile such as a site-created pile or a ready-made pile is driven into a supporting ground having a predetermined depth, and then a rising portion of the piled-up pile is grounded. The pile head is cut at a predetermined height, the concrete of the pile head is detached, the reinforcing steel of the pile head is taken out, and the pile is used as an anchor to the foundation concrete.

[0003] Then, after arranging a base bar on the discarded concrete, arranging a column bar, a band bar, a footing bar, and the like, a foundation concrete is cast to construct a foundation, and the base is separated from the pile. The pillars on the upper floor are built on the foundation.

[0004] A beam is joined to the slab construction height of a pillar built on a foundation, and the slab is supported by the beam.

[0005] However, in the conventional construction method,
It requires complicated construction to build the pillar foundation,
Since the pillars are erected on the constructed foundation, there is a problem that it takes time and the construction period becomes longer.

Therefore, Japanese Patent Application Laid-Open No. Hei 10-121489 (Japanese Patent No. 3098719) proposes that the lower part of the pile is located in the ground and the upper part of the pile is protruded to the ground to form a pillar. FIG. 9 shows a state in which a frame of the building structure 2 is constructed on the site 1, and excavation holes 4, 4... Are excavated in the ground 3 with a drilling tool such as an earth auger. It reaches the support layer 3a.

The drilling holes 4, 4,... Are filled with cement milk 5 and the piles 6, 6,... Are buried, and the piles 6, 6,.
The upper part protrudes above the ground and its top reaches the height of the ceiling of the building structure 2, so that the columns 7, 7,.
To form

The ground is improved by injecting a solidifying agent from the surface into the surface layer 3b of the ground 3. The depth of the ground improvement portion 8 is approximately 1 m. By artificially improving the surface layer 3b in this way, it is possible to accurately evaluate the ground characteristics while increasing the rigidity of the surface layer 3b, and to control the deformation amount of the columns 7, 7,. Even without the underground beam, the required strength of the building structure 2 can be sufficiently ensured.

After that, while the concrete 9 is poured, the girders 10, 10... Are erected on the tops of the columns 7, 7,. Further, the architectural structure 2 is completed by, for example, covering the folded roof 11.

[0010]

When the upper portion of the pile is formed as a pillar by protruding above the ground as described above, the pillar is directly joined to the pile, and the installation position of the pile is the position of the pillar. In general, the construction accuracy of the pile is not very good, and the construction error caused by the pile becomes a construction error at the immediate column position. As a result, the Japanese Patent Application Laid-Open No. 10-121489 (Japanese Patent No. 309871)
No. 9) was limited to a one-story building as a building structure suitable for low-rise stores and warehouses.

An object of the present invention is to eliminate the disadvantages of the prior art, to reduce the cost of the pillar by using the pile as a pillar, to allow the pillar and the pile to be built at the same time, and to provide a sufficient amount of time for building the foundation. Another object of the present invention is to provide a construction method capable of shortening a construction period and easily adjusting a construction error, so that a building having a plurality of floors can be constructed.

[0012]

According to the present invention, in order to achieve the above object, the present invention relates to a joint steel pipe having a pillar directly connected to a pile, built up, provided with a support plate, and provided with a bracket having an outer diaphragm. The gist of the present invention is that the steel plate is placed on a support plate, fitted to a column / beam joint of a column, a steel beam is joined to a bracket with an outer diaphragm, and grout is applied to a gap between the joined steel pipe and the column.

According to the first aspect of the present invention, the pillar is directly connected to the pile and built, so that the upper part of the pile is constructed so as to protrude above the ground, and this part is used as the pillar. Cost can be reduced. Moreover, since the pillar and the pile can be built at the same time, the frame can be constructed without being caught by the construction of the foundation, and the construction period can be shortened. In addition, since the joint steel pipe as a sheath tube is fitted to the column / beam joint of the column, the vertical error is adjusted at the vertical position of this joint steel pipe, and the horizontal error is adjusted by the gap between the joint steel pipe and the column By applying grout to the gap between the joined steel pipe and the column, integration can be achieved at a regular position.

According to the second aspect of the present invention, in addition to the above-mentioned operation, the support plate has the joining steel pipe placed thereon, and the vertical error can be adjusted by the position where the support plate is provided. In addition, by moving the joint steel pipe on the support plate, a horizontal error can be eliminated in a stable state by the gap between the column and the joint steel pipe. Further, since the support plate provided on the pillar can be formed by fillet welding, it can be made non-fabricated, and the cost can be further reduced.

According to the third aspect of the present invention, the tensile stress of the beam flange pushes the joint steel pipe in the opposite direction through the bracket with the outer diaphragm, and the force is applied by the bearing stress on the grout surface of the filled mortar or the like. It is transmitted to the beam joint. For this reason, it is not necessary to butt-weld the outer-diaphragm-attached bracket and the joining steel pipe, and joining by fillet welding becomes possible. As described above, the welding of the support plate and the welding of the joint steel pipe and the bracket with the outer diaphragm can all be performed by fillet welding, so that the non-fabric steel frame can be used to reduce the cost.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 are side views of each step showing one embodiment of the construction method of the present invention, FIG. 7 is a vertical sectional side view of a main part, FIG. 8 is a plan view of the same, and 12 in the figure is a ready-made pile. This includes PHC piles (pile) [centrifugal high-strength prestressed concrete piles], PRC piles (pile) [centrifugal high-strength prestressed reinforced concrete piles], steel pipes and H-shapes, as well as ready-made concrete piles such as steel piles and PC piles. Steel or the like may be used, and its type and material are not particularly limited. Further, instead of embedding and driving of the ready-made pile 12, an on-site formation pile may be used.

As shown in FIG. 1, the ready-made pile 12 is built, and at the same time, a ready-made pillar 13 such as a PHC column, a PRC pile column, a steel pipe wound PC pile column and the like is directly joined to the ready-made pile 12. In the figure, reference numeral 14 denotes a joint. In the illustrated example, the ready-made column 13 is formed by connecting two nodes.

As shown in FIG. 2, the height of the support plate 16 is confirmed at the lower boundary position of the column / beam joint 15 on the second floor of the prefabricated column 13 which forms the upper part of the prefabricated pile 12, and the correct height is confirmed. And joined by field welding (fillet or butt). When the ready-made column 13 is a concrete column, the support plate 16
In this case, a steel pipe 20 having the same diameter as the ready-made column 13 may be embedded at the time of manufacture, and may be welded here. Support plate 1
The height position 6 corrects the construction error in the vertical direction.

As shown in FIG. 7, the support plate 16 is stiffened by a stiffener 17 to support and support the standing plate. When the shearing force is small, the stiffener 17 is omitted and the support plate 16 is omitted.
Only may be.

The support plate 16 is welded to a predetermined position in a factory, and the support plate 1 is
A small plate for height adjustment may be welded on site 6.

As shown in FIG. 3, a joint steel pipe 19 as a sheath pipe formed by projecting a bracket 18 with an outer diaphragm.
Is mounted on a support plate 16 and fitted to the column / beam joint 15 of the ready-made column 13. The joined steel pipe 19 has a diameter slightly larger than the ready-made column 13, and can secure the gap 21 when fitted to the column / beam joint 15 of the ready-made column 13. Also,
The outer diaphragm-equipped bracket 18 has the same cross-sectional shape as the steel beam 22, and includes upper and lower flanges and a web.

On the support plate 16, a joining steel pipe 19 is provided.
In order to place the bracket 1 with the outer diaphragm, the joint 1 is adjusted so that the jointed steel pipe 19 is positioned at the regular position of the steel beam 22 with respect to the ready-made column 13.
8, the steel beams 22 on the second floor are joined together with a joining plate 24 attached thereto.

As shown in FIG. 5, a grout 23 such as mortar or concrete is applied to a gap 21 between the ready-made column 13 and the joining steel pipe 19 to integrate the ready-made column 13 and the joining steel pipe 19. Thus, the upper and lower flanges 22 of the steel beam 22
The tensile stress of a is the bracket 18 with the outer diaphragm.
Is transmitted to the column / beam joint through

The filling of the gap 23 between the ready-made column 13 and the joining steel pipe 19 with the grout 23 can be performed before the steel beam 22 is joined to the bracket 18 with the outer diaphragm.

As shown in FIG. 6, the second-floor deck plate 2
5 and work on the foundation 26 and the upper floor at the same time. The joint of steel beams on the roof floor (R floor) is made of steel pipe 1
Perform in another direction not depending on 9.

[0026]

As described above, the construction method of the present invention can reduce the cost of a pillar by using a pile as a pillar.
In addition, pillars and piles can be built at the same time, and the construction period can be shortened by the construction period of the foundation, and construction errors can be easily adjusted, making it possible to build a multi-story building. Things.

[Brief description of the drawings]

FIG. 1 is a side view of a first step showing one embodiment of a construction method according to the present invention.

FIG. 2 is a side view of a second step showing one embodiment of the construction method of the present invention.

FIG. 3 is a side view of a third step showing one embodiment of the construction method of the present invention.

FIG. 4 is a side view of a fourth step showing one embodiment of the construction method of the present invention.

FIG. 5 is a side view of a fifth step showing one embodiment of the construction method of the present invention.

FIG. 6 is a side view of a sixth step showing one embodiment of the construction method of the present invention.

FIG. 7 is a longitudinal sectional side view of a main part showing one embodiment of the construction method of the present invention.

FIG. 8 is a plan view of a main part showing one embodiment of the construction method of the present invention.

FIG. 9 is a perspective view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Site 2 ... Building structure 3 ... Ground 3a ... Support layer 3b ... Surface layer 4 ... Drilling hole 5 ... Cement milk 6 ... Piles 7 ... Pillar 8 ... Ground improvement part 9 ... Soil concrete 10 ... Girder 11 ... Folded roof 12 ... Ready-made piles 13 ... Ready-made columns 14 ... Joints 15 ... Column-beam joints 16 ... Support plates 17 ... Stiffeners 18 ... Brackets with outer diaphragms 19 ... Joined steel pipes 20 ... Steel pipes 21 ... Clearances 22 ... Steel beams 22 a ... Flanges 23 ... Grouts 24 ... joining plate 25 ... deck plate 26 ... foundation

Claims (3)

[Claims] 1. A pillar is directly joined to a pile and erected, and a joint steel pipe as a sheath tube is fitted to a joint between a pillar and a beam of the pillar, and a steel beam is joined to the joint steel pipe to form a gap between the joint steel pipe and the pillar. Construction method characterized by grouting. 2. The construction method according to claim 1, wherein a support plate is provided on the column, and the joined steel pipe is placed on the support plate and fitted to the column / beam joint of the column. 3. The construction method according to claim 1, wherein the jointed steel pipe has a bracket with an outer diaphragm protruding therefrom, and the ends of the steel beams are connected via the bracket with the outer diaphragm.