JP3790310B2 - Construction method of the building by the prior construction of steel frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction technique for a building with a steel frame construction.
[0002]
[Prior art]
Conventionally, construction of steel frames and reinforced concrete buildings has been performed in the following processes.
(1) Create cast-in-place concrete piles at predetermined intervals in the ground along the planned construction area of foundations and underground beams (hereinafter simply referred to as foundations).
(2) Excavate the ground in the planned construction area of the foundation, and assemble the formwork and rebar in the root cut.
(3) Install the required number of anchor bolts for the construction of steel columns at positions corresponding to the cast-in-place concrete piles in the formwork.
(4) Build a foundation by placing concrete in the formwork.
(5) After the concrete foundation has hardened after a certain curing period, backfill the surrounding area with excavated soil and roll it.
(6) A steel column is installed at a predetermined position on the foundation via the anchor bolt and the base plate, and a steel beam is installed on the steel column.
(7) Conduct concrete construction and finishing work.
[0003]
[Problems to be solved by the invention]
In the above prior art, the following problems are pointed out.
(a) After the construction of the concrete pile, the construction period of the steel frame can be extended only after the foundation is constructed and the foundation concrete is sufficiently cured and hardened.
(b) Since the construction work of the steel frame is performed by heavy machinery on the ground where the root excavation part was backfilled after the foundation was constructed, that is, the ground that was disturbed by backfilling, in order to ensure the safety of the work It is necessary to fully roll the backfill ground around the foundation.
[0004]
The present invention has been made under the circumstances as described above, and the technical problem is that the construction period can be shortened by making it possible to perform the steel frame construction work prior to the foundation construction. And to work safely.
[0005]
[Means for Solving the Problems]
The technical problem described above can be effectively solved by the present invention. That construction method of a building prior erection of steel according to the present invention comprises a steel material to the place concrete pile is first to ground during construction region for the foundation in the process of reclamation to place concrete pile at predetermined intervals The temporary pillar is buried in a state protruding to a predetermined height above the ground. Cut and align the top of the temporary column so that it is at a certain height above the ground, and weld the discarded plate. This discard plate is integrated with the foundation concrete described later and serves as a joint portion with the steel column. Here, the “foundation” includes an underground beam.
[0006]
Next, a steel column is built on the discard plate at the top of the temporary column, and the discard plate and the steel column are coupled. As a result, the steel column is erected on each cast-in-place concrete pile via the temporary column, that is, the steel frame is built prior to this without waiting for the foundation construction and its curing period.
[0007]
After the construction of the steel frame is completed, the ground in the planned construction area of the foundation is excavated, and a foundation integrated with the top of the cast-in-place concrete pile is constructed in this excavation part. In this construction process, the entire temporary column is embedded in the concrete of the foundation, whereby the lower end portion of the steel column is integrated with the foundation via the discard plate and the temporary column. In parallel with this foundation construction work, groundwork will be carried out on the ground .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a building construction method according to a steel frame preceding construction according to the present invention will be described with reference to FIGS. 1 to 5.
[0009]
According to the construction method of the present embodiment, first, cast-in-place concrete piles 2 are created at predetermined intervals in the ground 1 along the planned construction area of the foundation, as shown in the cross-sectional perspective view of the main part in FIG. This cast-in-place concrete pile 2 is constructed corresponding to the steel column post-installation position, which will be described later, and as a construction method thereof, for example, a steel pipe is driven into the ground and concrete is poured into the steel pipe. A method of pulling out or a method of pouring concrete into the hole after previously drilling the ground is adopted.
[0010]
In the process of creating the cast-in-place concrete pile 2, the temporary column 3 made of a steel frame material such as H-shaped steel is embedded in the concrete at the upper end so as to protrude to a predetermined height on the ground. Therefore, the temporary pillar 3 is integrated with the cast-in-place concrete pile 2 that hardens with time. The top end 3a of the temporary pillar 3 is cut and aligned so as to have a certain height, and as shown in the cross-sectional perspective view of the main part of FIG. 2, a substantially square shaped discard plate 31 made of a steel plate is placed on the top end 3a. Place and weld in a horizontal overhang. The discard plate 31 has a required number of bolt insertion holes 31a.
[0011]
When the cast-in-place concrete pile 2 is hardened and the temporary column 3 is firmly fixed, as shown in the elevation view of FIG. 3, the steel column made of H-shaped steel or the like is disposed on the discard plate 31 at the top end of the temporary column 3. 4 is built. A base plate 41 similar to the discard plate 31 is welded to the lower end of the steel column 4 in advance, and the bolt 6 (see FIG. 5) is inserted into both bolt insertion holes that are aligned with each other. ) And a nut (not shown) screwed to the steel column 4, the steel column 4 is coupled to the temporary column 3, and is securely held by the cast-in-place concrete pile 2 via the temporary column 3. Further, a steel beam 5 on each floor is installed between the steel columns 4 and 4 built in this way.
[0012]
Heavy machinery is used for the construction work of the steel frame such as the construction of the steel column 4 and the construction of the steel beam 5 as described above. This steel construction method is performed by a temporary pillar 3 provided in the cast-in-place concrete pile 2 to be described later. Since it is performed prior to the construction of the foundation 7 with excavation, the heavy machinery can safely travel on the unexcavated raw ground 1 (the ground where the connective structure of soil particles is not disturbed).
[0013]
Next, as shown in the elevation view of FIG. 4 and the cross-sectional perspective view of the main part of FIG. 5, the ground 1 in the planned construction area of the foundation including the periphery of the temporary column 3 is excavated, and the cast-in-place concrete pile 2 The root cutting part 11 where the top end part is exposed is formed, and the foundation 7 is constructed along the root cutting part 11. The foundation 7 is constructed by a known method in which a formwork is assembled along the root cutting part 11 and a concrete is placed after a necessary reinforcing bar is disposed therein. The formwork is assembled so as to surround the top end portion of the cast-in-place concrete pile 2 and the temporary pillar 3 and the discard plate 31 protruding from the top end portion. The pillar 3 and the discard plate 31 are embedded in the foundation 7 constructed by placing the concrete in the formwork, and are integrated with the concrete (foundation 7) that is cured and cured over time.
[0014]
On the other hand, after the construction work of the steel column 4 and the steel beam 5, through the steps such as formwork assembly, bar arrangement and concrete placement to the steel frame, the upper-level frame 8 is sequentially constructed as shown in FIG. However, these operations can be continued immediately after completion of the steel frame construction without waiting for the completion of the construction of the foundation 7. This is because the steel column 4 is already firmly supported and fixed to the underground cast-in-place concrete pile 2 via the temporary column 3 before the foundation 7 is constructed. Therefore, the construction of the frame 8 on the upper floor can be performed in parallel with the construction of the foundation 7 and the construction period is shortened.
[0015]
The foundation 7 develops a supporting force against the load of the frame 8 along with the hardening of the concrete. Moreover, after the concrete of the foundation 7 is hardened, the surrounding root cutting portion 11 is backfilled, but since the steel frame construction has already been completed, it is assumed that heavy machinery for the steel frame construction will travel. There is no need to roll back the ground.
[0016]
In addition, this invention is not limitedly interpreted by embodiment of illustration. For example, in the above embodiment, the temporary column 3 is integrated with the cast-in-place concrete pile 2, and then the top end 3a is trimmed at a certain height and the discard plate 31 is welded. It can also be welded.
[0017]
【The invention's effect】
According to the construction method of the building by the prior construction of the steel frame concerning the present invention, the following effects are realized.
(1) Since the steel frame is constructed prior to foundation construction, and subsequent frame construction can be carried out without waiting for completion of foundation construction, the construction period is significantly shortened.
(2) Since the construction of the steel frame is performed on the original ground undisturbed by excavation prior to the root excavation for the foundation construction, the safety of the work is improved.
(3) There is no need to roll the backfill ground after the foundation construction assuming heavy machinery used for steel construction.
[Brief description of the drawings]
FIG. 1 shows an essential part of a construction method according to an embodiment of the present invention showing a state in which a temporary column protrudes to a predetermined height on the ground cast-in-place concrete pile in the process of creating the cast-in-place concrete pile in the ground. It is a cross-sectional perspective view.
FIG. 2 is a cross-sectional perspective view of a main part showing a state in which a discard plate is welded to the top end of the temporary column in the embodiment.
FIG. 3 is an elevational view showing a process for constructing a steel frame on a discard plate at the top end of the temporary column in the embodiment.
FIG. 4 is an elevational view showing a state where a foundation is constructed on a cast-in-place concrete pile by excavating the ground and excavating a temporary column in the foundation in the embodiment.
FIG. 5 is a cross-sectional perspective view of a main part showing a state in which a foundation is constructed on a cast-in-place concrete pile by root excavation of the ground and a temporary column is embedded in the foundation in the embodiment.
[Explanation of symbols]
1 Ground 11 Root cutting part (Root cutting excavation part)
2 Cast-in-place concrete pile 3 Temporary column 31 Discard plate 4 Steel column 7 Foundation

Claims (1)

A cast-in-place concrete pile is created at predetermined intervals in the ground of the planned construction area of the foundation, and a temporary column made of steel frame is embedded in the cast-in-place concrete pile in a state of projecting to a predetermined height above the ground. From
A steel column is built on the discard plate at the top of the temporary column, and this discard plate and the steel column are combined .
Thereafter, the ground of the construction planned area of the base and roots cut excavated this root cutting an embedded state the whole of the provisional pillar to build the heavens end and the foundation of the integral with the concrete in the foundation of the cast-in-place concrete piles in the drilling portion In parallel with this foundation construction work, the construction method of the building by the preceding construction of the steel frame, characterized in that construction of the ground frame is performed .

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