JP3289163B2 - How to build underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground construction in which slabs are supported by a temporary support member and slabs are constructed sequentially from an upper floor, and concrete columns are sequentially constructed from a lower floor after the completion of the construction. The present invention relates to a method for constructing a structure, and more particularly to a method for constructing an underground structure characterized in that pillars can be constructed easily and reliably.

[0002]

2. Description of the Related Art In a method of constructing an underground structure in which a slab is supported by a temporary support member and a slab is sequentially constructed from an upper floor, and after completion of the construction, concrete columns are sequentially constructed from a lower floor. This pillar was constructed between the upper and lower slabs of the already constructed pillar, and the concrete was cast on this pillar near the upper slab.

[0003]

Therefore, the construction of this pillar has the following problems. 1. Since the concrete placing work is performed on the upper part of the pillar, a work scaffold is required for each pillar, and it takes time to move between the pillars. 2. Since the concrete placement position of the column is close to the upper slab, the working posture is poor, and the working efficiency is significantly reduced. 3. If the column reinforcements and hoop reinforcements buried in the columns are densely arranged, it is difficult to insert the concrete casting hose, and there is a problem in securing the quality. 4. Since compaction of the concrete to be cast on the pillar has to be performed from the outside of the formwork, it is difficult to cast a dense concrete. The concrete of this column is constructed at a predetermined interval from the upper layer slab, and non-shrink mortar is cast in the gap. There were problems such as problems with work efficiency and quality assurance.

[0004]

According to the present invention, a slab is constructed from an upper floor to a lower floor sequentially while supporting the slab by a temporary support member provided at a column position, and after the construction is completed, the slab is sequentially constructed from a lower floor to an upper layer. A method of constructing an underground structure on a floor, in which a pillar made of concrete including a temporary support member is constructed, wherein a space is provided in the temporary support member over a slab thickness,
Performs concreting of the columnar from the space, in the method for constructing underground structures, characterized in that build a column sequentially upper floor from the lower floor, across the slab thickness vibrator
-An insertion hole is formed in the column joint section of the slab,
This is a method for constructing an underground structure, characterized in that concrete compaction is performed by taring .

[0005]

According to the present invention, a slab is sequentially constructed from an upper floor to a lower floor while the slab is supported by a temporary support member provided at a column position, and after the construction is completed, the slab is sequentially moved from the lower floor to the upper floor sequentially. A method of constructing an underground structure for constructing a pillar made of concrete including: a space extending over the thickness of the slab in the temporary support member, and concrete casting of the pillar from the space, Since the pillars will be built on the upper floors in order from the beginning, when constructing the pillars, there is no need for a work scaffold for concrete casting, improving work efficiency,
Regardless of the hoop streak, insert a concrete casting hose to ensure concrete quality. And also, the present invention forms a vibrator insertion hole across the slab thickness a pillar joining the cross-section of the slab, Runode performed to compaction of the concrete ten <br/> fraction, a high dense solid concrete quality obtain.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a construction procedure of an underground structure according to the present invention. In the construction of the underground structure 1, first, the foundation pile 2 is constructed by the cast-in-place pile method conventionally performed from the ground. The foundation pile 2 is appropriately selected such as an expanded pile, a Venoto pile, and a reverse pile. Next, the temporary supporting member 3 is fixed and fixed to the foundation pile 2 at a pillar position to be constructed later. The temporary support member 3 is made of a steel material or the like, and its shape is selected from a combination of an H-shaped steel, a C-shaped steel, an I-shaped steel, and a C-shaped steel. Next, root cutting is performed to a predetermined depth, and the uppermost slab 4 is constructed. Slab 4 is supported on temporary support member 3 has already been built. Thereafter, when the root is cut again and the root is cut to a predetermined position, the next lower slab 4 is constructed.

Next, the details of the slab column joint 5 will be described with reference to FIG. In the present embodiment, H is used as the temporary support material 3.
Uses a shape steel. A concrete stopper 6 made of expanded metal, mesh wire mesh, steel plate, or the like having a predetermined slab thickness is fixed between both flange ends of the H-shaped steel, and a space 7 is provided. Concrete of the pillar 11 to be cast is poured. In addition, a stud 3 ' is provided upright on the flange surface of the temporary support member 3 which is in contact with concrete within a range of a predetermined slab thickness. stud
3 ' secures the concrete between the slab 4 and the temporary support 3 more securely. Instead of the stud 3 ′ , a reinforcing bar, a plate, or the like may be joined to the temporary support member 3. So
The slab column joint 5 has a vibrator insertion hole 9
Are provided over the slab thickness, and concrete compaction can be performed reliably. The arrangement and shape of the vibrator insertion hole 9 are appropriately selected.

Next, a method of constructing a pillar will be described with reference to FIG. The root is cut to a predetermined depth, and the lowermost slab 4
To build. (A) Next, root cutting is performed to a predetermined final root cutting depth. After that, the pressure plate 8 is constructed,
Rebar construction such as column reinforcement, hoop reinforcement (not shown)
Next, the column formwork 10 is erected at a predetermined position of the column 11.
The column form 10 has an upper portion formed with a predetermined interval from an upper layer slab. The concrete placement of the pillar 11 is carried out from the upper slab 4 of the pillar 11 already constructed.
This is performed by inserting a concrete casting hose into the space 7. Similarly, since the compacting operation of the concrete is performed from the vibrator insertion hole 9 formed in the upper layer slab 4, the construction of the pillar 10 is performed easily and reliably.
(B) Then, in the gap between the upper slab 4 and the pillar 11,
The non-shrink mortar 12 is easily and reliably cast from the upper slab 4 in the same manner as the concrete casting of the column 11. Thereafter, the upper pillars 11 are sequentially constructed by the same procedure. (C)

[0009]

According to the method of constructing an underground structure according to the present invention, the slabs are successively constructed from the upper floor to the lower floor while being supported by the temporary support members provided at the positions of the pillars. When constructing a pillar made of concrete including the temporary support member on the upper floor, a space is provided in the temporary support member over the slab thickness, and concrete is cast from the space to the pillar, Since the pillars are constructed sequentially from the lower floor to the upper floor, concrete can be cast from the upper slab of the pillar to be built, eliminating the need for concrete placing work near the upper slab of the pillar. In addition, the need for a work scaffold for placing concrete is eliminated, and it is not necessary to move the work scaffold for each pillar, and work can be performed in a good working posture, so that concrete can be cast easily and reliably. In addition, since a space extending over the thickness of the slab is provided in the temporary support member, concrete can be poured without hindrance regardless of the presence of the column bar and the hoop bar, and the quality can be ensured. Further, in the method of constructing an underground structure according to the present invention, the vibrator insertion hole is formed in the column joint section of the slab in the slab thickness, so that the vibrator hooking is performed in the same manner as the concrete placing operation. Since it can be performed from the slab of the upper layer of the column, it is possible to easily and surely obtain dense concrete of high quality.

[Brief description of the drawings]

Fig. 1 Construction procedure diagram for underground structures

FIG. 2 is a detailed view of a slab column joint.

Fig. 3 Pillar construction procedure diagram

[Explanation of symbols]

1: Underground structure 2: Foundation pile 3: Temporary support 3 ': Stud 4: Slab 5: Slab column joint 6: Concrete stop 7: Space 8: Pressure plate 9: Vibrator insertion hole 10: Column form 11: Pillar 12: Non-shrink mortar

Claims (1)

(57) [Claims] 1. A concrete structure including a temporary support member from a lower floor to an upper floor sequentially from an upper floor while the slab is being supported by a temporary support member provided at a pillar position, and the construction is completed sequentially from an upper floor to a lower floor. A method for constructing an underground structure, comprising constructing a column consisting of: a space extending over the thickness of the slab in the temporary support member, concrete casting of the column from the space, and sequentially from the lower floor to the upper floor. in the process the construction of underground structures rather than building a pillar, Baibure across the slab thickness
Hole in the cross section of the slab
Work for concrete compaction
And a method for constructing an underground structure.