JP2662705B2 - Construction method of underground structure that enables early restoration of aboveground part - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a construction method that enables an early restoration of a ground portion directly above an underground structure when the underground structure is constructed. is there.

[Related Art] Conventionally, when a structure such as a parking lot or a substation is constructed underground, construction by a reverse winding method is frequently used.

This reverse winding method is a method of constructing a skeletal frame from the ground to the ground, which not only complicates the work but also lengthens the construction period, requires a large number of cutting beams and supports, and requires a top plate. Even after slab construction, there are many openings required to carry out the excavated soil inside and to put materials into the inside, and the fault that the above-ground part cannot be restored unless the underground structure is completed. there were.

[Problems to be Solved by the Invention] According to the above-mentioned conventional underground structure construction method, when the occupation period of the above-ground part is limited, the structure is particularly placed under the premises in a public facility such as a park, a school or a road. However, there was a problem in that the restoration of the above-ground part was delayed when constructing the above.

The present invention has been made in order to solve such a conventional problem, and has a technical problem to provide a construction method capable of promptly restoring the above-ground portion when constructing an underground structure. Things.

[Means for Solving the Problems] As means for solving this technical problem, the present invention is to construct a continuous underground wall underground, and to form an internal excavated soil at an upper end surrounded by the continuous underground wall. A top plate slab is cast, leaving an opening for unloading and material input, and the upper surface of the top plate slab is buried before or in parallel with excavation and construction of the continuous underground wall. The gist is that.

[Operation] After constructing a continuous underground wall in the basement, the top plate slab is cast at the upper end, leaving an opening for internal excavated soil removal and material input. Before or in parallel with the construction of the object, the aboveground part can be backfilled and restored early.

EXAMPLES Hereinafter, the present invention will be described in detail in the order of steps with reference to the illustrated examples.

FIG. 1 shows the primary excavation work, in which the ground part 1 is dug down to a position P which is the upper surface of the top slab.

FIG. 2 shows the construction of a foundation pillar, in which a continuous underground wall 2 is constructed in the underground part of the primary excavation so as to be closed in a circular cross section, and a foundation pillar 3 is erected at a predetermined location.

FIG. 3 shows the construction of the top slab, in which the top slab 4 is cast and integrated on the upper end of the continuous underground wall 2 after the foundation pillar is built. At this time, an opening 5 for carrying out the excavated soil and carrying in the construction material is provided. This opening 5 is
Since the forward winding method can be adopted, the number can be reduced as compared with the reverse winding method, and it is provided at one or a plurality of positions according to the construction area.

FIG. 4 shows the backfilling / restoration work of the above-ground portion. After the top slab 4 is cured, the backing is left with the opening 5 left behind.
The ground unit 1 'is restored.

FIG. 5 shows the internal excavation work. As shown in FIG. 4, after the above-ground portion 1 'is restored or in parallel with the restoration, the inside surrounded by the continuous underground wall 2 is sequentially positioned from the bottom to the bottom position Q. Dig into it. During the digging, a steel material or a steel beam 6 for preventing buckling is attached to the foundation pillar 3.

In this excavation work, since the continuous underground wall 2 has a circular cross section, the bending moment is smaller than that of the underground wall having a rectangular cross section, and cutting beams and supports are not required, which is economical. At the same time, the construction period can be shortened.

FIG. 6 shows the construction of the skeleton of the structure. In this case, a forward winding construction method in which the skeleton is constructed in order from the bottom can be adopted. Further, the side wall 8 does not require a beam required by the reverse winding method.

FIG. 7 shows a state in which the skeleton 9 is completed in the underground part. After that, interior materials and finishing work are carried out by carrying in materials using the opening 5, and the structure is completed in due course.

In the above embodiment, the continuous underground wall has a circular cross section. However, the present invention is not limited to this, and the present invention can be applied to a continuous underground wall having a rectangular or oval or oblong cross section. It is possible to

[Effects of the Invention] As described above, according to the construction method of the present invention, after constructing the continuous underground wall, the top plate slab is cast at the upper end thereof, so that the inside excavation and the construction of the structure can be performed. Prior to or in parallel with these, the top surface of the top plate slab was backfilled, allowing the ground part to be restored at an early stage, especially when constructing underground structures at sites where the occupation period is limited. It is valid. In addition, in the case of the present invention, since the forward winding method is possible, the construction can be performed efficiently and the construction period can be shortened. If it is constructed in a cross section, an excellent effect such as no need for a beam on the wall of the skeleton can be obtained.

[Brief description of the drawings]

The drawings show the construction method according to the present invention in the order of steps.
Figure shows primary excavation work, Figure 2 shows foundation pillar work, Figure 3 shows top slab construction work, Figure 4 shows backfilling and restoration work, Figure 5 shows internal excavation work, and Figure 6 shows skeleton construction work. FIG. 7 is an explanatory view showing a completed skeleton. DESCRIPTION OF SYMBOLS 1 ... Above ground part 2 ... Continuous underground wall 3 ... Foundation column 4 ... Top plate slab 5 ... Opening 6 ... Steel material or steel beam for buckling prevention 7 ... Slab bottom plate 8 …… side wall 9 …… framework

Claims (1)

(57) [Claims] 1. A continuous underground wall is constructed underground, and a top plate slab is cast at an upper end surrounded by the continuous underground wall, leaving an opening for carrying out internal excavated soil and inputting materials. A method of constructing an underground structure capable of recovering the ground portion at an early stage, wherein the upper surface of the top slab is backfilled prior to or in parallel with excavating and constructing the inside of the continuous underground wall.