JP3695824B2 - Construction method by reverse driving method in underground construction - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method using a reverse driving method in underground construction, and more specifically to a column reinforcement arrangement method.
[0002]
[Prior art]
Conventionally, in the construction of column reinforcement in underground construction, after excavating to a position below the beam where column reinforcement is possible as shown in FIG. 4 (a), the bottom of the excavation is shown in FIG. 4 (b). The column reinforcement b is pressed and arranged by the scaffold a disposed above, and a beam and a slab form c as shown in FIG. 4 (c) are assembled, and the beam as shown in FIG. 4 (d) is assembled. The concrete of slab d is laid.
[0003]
Further, as shown in FIG. 4 (e), the lower part of the beam and the slab d is excavated, and the concrete of the column f is placed when the work floor d 'is completed by repeating the above process. (See Fig. 4 (f))
[0004]
[Problems to be solved by the invention]
However, according to the above-mentioned conventional method, in the reinforcement of column reinforcement, (b) the reinforcement of the column reinforcement is carried out to the lower beam, so that the excavation is carried out to a position about 1 m below the lower part. The amount of earthwork is large and requires a lot of work. (B) Since the welding joint is under the beam and the excavation is performed to the bottom of the beam in the reinforcement of the column reinforcement, the scaffolding is performed and the work is performed at a high place on the scaffolding, and the scaffold is assembled and disassembled. Perform the process.
[0005]
The present invention has been proposed in view of the above-described problems of the prior art, and the object of the present invention is to provide a construction method by a reverse driving method in underground construction in which temporary work is reduced and workability is greatly improved. There is in point to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the construction method by the reverse driving method in the underground work according to the present invention , a temporary support column is erected at the position for constructing the pillar of the construction object, and the beam of the lower floor part to be constructed is constructed. It was drilled to a lower position, the formwork beam slab of the lower floor portion Kenkomi, at a position corresponding to the pillar muscle to be reinforcement in the mold, by arranging a pipe provided with a hoop pillar Build a beam slab fixed to the temporary support by placing a beam slab concrete in the formwork to secure a through- hole of the line, insert a column bar into the pipe, and the inserted column The upper end of the bar 5 is pressed against the lower end of the column bar hanging from the upper floor, and grout is injected into the pipe to integrate the column bar with the beam slab.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described with reference to the most preferred embodiments of the present invention shown in the drawings.
As shown in FIG. 1 (a), after the temporary support column 2 is erected at the position for constructing the pillar of the construction object, excavation is performed to the position where the retaining frame 1 under the beam on the lower floor to be constructed is assembled. At this time, construction of the column of the lower floor is not yet performed . Next, the form of the beam slab 4 on the lower floor is built, and the band 8 is provided at the position surrounding the temporary support 2 in the form ( the position corresponding to the column reinforcement to be arranged ). The winding pipe 3 is disposed to secure a through hole for the column reinforcement, and the concrete of the beam slab 4 is placed in the formwork to construct the beam slab 4 fixed to the temporary support column 2 . (See Fig. 1 (b))
Then after further completing the excavation process of the lower floor portion of the lower, as shown in FIG. 1 (c), the winding pipe of the lower floor portion already mentioned above have completed pouring of the concrete beam slab (slab existing floor) 3 through interpolation the Hashirasuji 5 defined by pillars muscle through-holes by the upper end of the pillar muscle 5 and its inserted and pressed against the lower end of the pillar muscle 5 which depends from upstairs the slab existing floor. This is the pillar muscle 5 of said slab existing floor, comprising the was wine de single pipe reinforcement is passed into the third state (see FIG. 1 (d) and (e)). Then, by injecting grout 6 in the same column muscle through hole filling the gap between the pillars muscle 5 and the pipe 3 in the winding pipe 3 (FIG. 1 (f), and FIG. 2, see FIG. 3), which As a result, the column 5 is integrated with the beam slab 4.
In the figure, 8 is a band, and w is a pressure contact portion of the column 5.
[0008]
【The invention's effect】
According to the present invention, as described above, a temporary support column is erected at a position for constructing a pillar of the construction object, and is excavated to a position below the beam on the lower floor portion to be constructed, and a beam slab pattern on the lower floor portion is constructed. A frame is installed, and a pipe with a bar is provided at a position corresponding to the column reinforcement to be arranged in the formwork to secure a through- hole for the column reinforcement, and a beam slab in the formwork. A beam slab fixed to the temporary support column is constructed by placing the concrete of the column, a column reinforcement is inserted into the pipe, and the upper end of the inserted column reinforcement is suspended from the upper floor. of pressure contact with the lower end, by Rukoto the pillar muscle by injecting grout into the pipe turn into integral with the beam slab, construction of pillars muscle becomes a work on the slab of this set which construction has been completed, the pillars muscle of pressure also may be working on the same slab on the order of one meter pillars muscle pressing position in the general method , Such as scaffolding is not needed in the conventional method, workability is significantly improved.
[0009]
For excavation work, drilling is performed up to the position where the stop frame under the beam can be constructed, the beam stop frame can be directly received by the excavation surface, beam support work is not required, and the excavation earth work amount is further reduced. Improves.
[0010]
[Brief description of the drawings]
FIGS. 1A, 1B, 1C, and 1E are longitudinal sectional views showing work steps of a construction method using a reverse driving method in underground construction according to the present invention.
FIG. 2 is an enlarged plan view showing details of column reinforcement.
3 is a longitudinal sectional view of FIG.
4 (a), (b), (c), (d), (e), and (f) are vertical cross-sectional views showing work steps of a conventional method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stop frame 2 Temporary support | pillar 3 Winding pipe 4 Beam slab 5 Column reinforcement 6 Grout 7 Formwork 8 Band reinforcement w Column contact pressure part

Claims (1)

In the construction method using the reverse driving method in underground construction , a temporary support column is erected at the position where the pillar of the building is to be constructed, drilled to the position below the beam of the lower floor to be constructed, and the beam slab of the lower floor is A formwork is installed, and a pipe with a band is installed at a position corresponding to the column reinforcement to be arranged in the formwork to secure a through hole for the column reinforcement. A beam slab that is fixed to the temporary column by constructing slab concrete, a column is inserted into the pipe, and the upper end of the inserted column is suspended from the upper floor. A construction method by a reverse driving method in underground construction , wherein the bottom of the bar is pressed against the bottom of the bar and a grout is injected into the pipe to integrate the column bar with the beam slab.

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