JP2001329700A - Temporary jointing method for column during building demolition in jack system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temporary joint method for a column during jack system which is capable of improving the safety of demolition work, of easily corresponding with the column to be jointed, of reducing construction cost. SOLUTION: Angles 6 are installed with anchor bolts 5 on four surfaces of a foundation column 3. Next, at the upper portion of the angles 6, a pair of channel-shaped jointing steel members 4 are jointed with bolts 8 so as to form a steel pipe column, and the joint member 4 is arranged by straddling the vicinity of the column 2 and the foundation column 3. An opening at the lower portion of a pair of jointing steel member 4 which becomes a form of steel pipe column is closed at the upper surface of the angle 6, and an opening at its upper part is covered with a form 9. Within this closed space, mortar grout 12 is filled from a grunt filling hole 11 at the lower portion of the joint steel member 4 and hardened. After hardening of the grout, when the jointing steel member 4 jointed by the bolts is removed, the space between the bottom end of the column 2 and the foundation column 3 is connected with the mortar grout 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling a multi-story building, and more particularly to a method for temporarily joining columns when dismantling a building.

[0002]

2. Description of the Related Art In the dismantling of a multi-storey building, one or several floors are usually dismantled from the top floor. Also,
For dismantling, for example, pillars and slabs were demolished with a large breaker, and concrete blocks and steel frames at this time were dropped downstairs, and finally carried out from the first floor.

[0003]

However, in the case of the above dismantling method, heavy equipment such as a large breaker must be lifted and lifted on the upper floor by a lifting crane. It is also necessary to reinforce the floor slab for the large breaker to work on.

[0004] In addition, an opening for lowering concrete blocks, steel frames, and the like when demolished by a large breaker is required, and there is a danger associated with the work at this time.

[0005] Furthermore, due to the problem of dust and noise, it was necessary to cover the entire building with a curing sheet.

As a method for solving such a problem, there is a disassembly method described in JP-A-10-95594. In this dismantling method, the jack system is used to support the first floor of the building and the dismantling work is started from the first floor, so there is no need to drop concrete blocks or steel frames from the upper floor, and the safety of dismantling work Can be improved. In addition, the work involved in lifting heavy equipment, reinforcing floor slabs and installing curing sheets throughout the building can be omitted.
As a result, the construction period can be shortened.

In the above dismantling method, columns and ceiling beams on the first floor are dismantled, jack-down is performed, and the lowered floor is dismantled. It is necessary to temporarily connect the pillars of the lowered floor and the foundation pillars.

Japanese Patent Application Laid-Open No. H10-95594 does not specifically disclose a method of temporarily joining columns at the time of disassembly, but in this temporary joining, the columns have sufficient strength from the viewpoint of safety of dismantling work. We can join each other, the construction cost is low,
In addition, a highly versatile method capable of coping with various column structures is desired.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for temporarily joining pillars at the time of dismantling a building using a jack system, which improves the safety of dismantling work, is easy to cope with pillars to be joined, and has a low construction cost. It is in.

[0010]

According to the present invention, there is provided a jack system for pushing up a building frame with a hydraulic jack on a first floor to support the weight of a building on two or more floors. After dismantling, shrink the jack and lower the whole building, temporarily join the pillars of the second floor and the foundation pillars, dismantle the floor that was lowered to the first floor after temporary joining, In the method of dismantling a multi-story building by sequentially repeating, the temporary joining is performed by integrally assembling two U-shaped joint steel members from both sides of a lowered floor column and a foundation column into a steel pipe column, The upper and lower openings of a pair of jointed steel materials in the form of steel pipe columns are closed, and the mortar grout is filled into the closed space and hardened. Pillar temporary connection It is a method.

In such a method, the vertical load of the building at the time of temporary joining of columns is given by the compressive strength of the mortar grout, and the tensile force of the diversion moment can be dealt with by the adhesive force of the mortar grout. The columns are joined together with sufficient strength from the viewpoint of the properties.

[0012] The two joining steel materials can sufficiently surround both the column and the foundation column, and are preferably removed after grout hardening and diverted at the time of temporary joining of the column in the next dismantling operation. In this way, it is possible to cope with all the pillars on the upper floor which are extended lines of the foundation pillars, and it can be used for every rotation, so that the construction cost is reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

Before describing an embodiment of the method for temporarily joining columns according to the present invention, a procedure for disassembling a multi-story building to which this method is applied will be described.

According to the example shown in FIG. 1, first, a floor slab on the second floor of a multi-story building is demolished, and a plurality of jack systems 1 are installed on the first floor as shown in FIG. The hydraulic jack provided on the system pushes up the third floor beam to support the weight of the building above the second floor. At this time, the jack system is arranged so that the building weight is equally applied to each jack. Next, as shown in FIG. 1 (b), the outer and inner walls of the first floor were demolished to expose exposed pillars,
Demolish the first-floor and second-floor floor beams. Then, FIG.
Shrink the jack as shown in (c) and lower the entire building to the demolished first floor.

In such a state, as shown in FIG. 1 (d), the base pillar 3 and the pillar 2 which was the second floor before on the extension line are connected with the later-described joining steel material 4. Make a temporary connection in the same way. Thereafter, the jack system was removed, the floor slab on the second floor was demolished again, and a plurality of jack systems 1 were installed on the first floor as shown in FIG. 1 (e). To support the weight of the building above the second floor. By sequentially repeating the steps described above, the multi-story building is dismantled from the first floor.

However, in FIG. 1, only the framework of the illustrated multi-story building is shown in order to make the above description easy to understand.

Next, a method of joining columns at the time of dismantling the above-mentioned multi-story building will be described. FIG. 2 is a view best illustrating an embodiment of the column joining method according to the present invention, and FIG.
2 is a sectional view taken along the line II ′, and FIG. 4 is a sectional view taken along the line II-II ′ of FIG.

In carrying out the column joining shown in FIGS. 2 to 4, two U-shaped joining steel members 4 are prepared. 2
When the two joining steel materials 4 are bolted to each other with the concave portions facing each other, the joint steel materials 4 have a form like a steel pipe column, and in this state, both the column 2 and the foundation column 3 can be sufficiently surrounded.
The shape of the joining steel material 4 may be any shape as long as it becomes a steel pipe column when the two joining steel materials are assembled together.
Whatever shape, such as a shape and a V shape, is suitable for the shape of the pillar to be attached.

In order to dispose such a joining steel material 4 over the periphery of the lower end of the column 2 and the upper end of the foundation column 3, first, anchor bolts 5 are driven into four surfaces of the foundation column 3, and The angle 6 is attached to the anchor bolt 5 using an anchor bolt 5.
Next, at the upper part of the angle 6, a pair of joining steel materials 4 are joined to each other with bolts 8 from both sides of the foundation pillar 3 so as to form a steel pipe pillar. The lower opening of the pair of joint steel members 4 in the form of steel pipe columns is closed by the upper surface of the angle 6, and the upper opening is closed by using the mold 9 as a lid.

In this way, a closed space is formed around the lower end of the column 2 and the upper end of the foundation column 3 by the pair of joining steel members 4, the angle 6, and the formwork 9. In this space, the joining steel member 4 The mortar grout 12 is filled from the grout filling hole 11 provided at the lower part. At this time, since the air vent portion 10 is provided above the joining steel material 4, grout can be easily and quickly filled in the space. Further, by arranging the gasket 7 at the joint interface between the joint steel materials 4 to eliminate the gap, it is possible to prevent the grout from leaking at the time of filling.

After the filled mortar grout 12 is hardened, the bolted steel material 4 is removed, and the space between the lower end of the column 2 and the foundation column 3 is reduced.
To be connected. In addition, the removed joint steel material 4 is diverted at the time of column temporary joining in the next dismantling work. That is,
The joint steel material 4 is removed and diverted every time.

After the above-described steps, the building is dismantled by the jack system as described above.

[0024]

As described above, according to the present invention,
When dismantling a multi-story building using a jack system that pushes up the building frame with hydraulic jacks, after dismantling the first floor, jack down and lower the upper floor, then dismantle the lowered floor. In doing so, it is necessary to temporarily join the pillars of the lowered floor and the foundation columns, but this temporary joining is performed by bolting two U-shaped joint steel members from both sides of the pillars of the lowered floor and the foundation columns It can be implemented by assembling into a form like a steel pipe column, closing the upper and lower openings of the form of this steel column, filling the closed space with mortar grout, and curing.

Since the pillars are joined with the mortar grout as described above, if the joint steel is manufactured based on the cross-sectional dimensions of the base pillars, all the pillars on the upper floor can be accommodated. As a result, a single building When disassembling, it is possible to construct with two or three kinds of joining steel materials.

Further, the vertical load of the building at the time of temporary joining of the columns is:
The compressive strength of the mortar grout is provided, and the tensile force of the diversion moment can be handled by the adhesive force of the mortar grout.

The joining steel material can be diverted, so that the construction cost is low.

The joining steel material is made of reinforced concrete (RC
), Steel frame reinforced concrete structure (SRC structure), and steel frame structure (S structure).

[Brief description of the drawings]

FIG. 1 is a view for explaining a dismantling procedure of a multi-story building to which a method for temporarily joining columns according to the present invention is applied.

FIG. 2 is a diagram showing an embodiment of a method of joining columns when disassembling a multi-story building according to the present invention.

FIG. 3 is a sectional view taken along the line I-I ′ of FIG. 2;

FIG. 4 is a sectional view taken along line II-II ′ of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Jack system 2 Pillar 3 Foundation pillar 4 Joining steel material 5 Anchor bolt 6 Angle 7 Gasket 8 Bolt 9 Formwork 10 Air vent part 11 Grout filling hole 12 Mortar grout

Continued on the front page (72) Inventor Akira Yamakawa 2-35 Yatacho, Shinjuku-ku, Tokyo Dainippon Civil Engineering Co., Ltd. (72) Inventor Hiroshi Tanaka 2-35 Yatamachi, Shinjuku-ku Tokyo ) Inventor Eiichi Nakajima 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Iron Construction Construction Co., Ltd. (72) Inventor Tadataka Ueshima 2-5-3 Misaki-cho, Chiyoda-ku Tokyo Reference) 2E176 AA01 DD61

Claims (2)

[Claims] 1. A jack system that pushes up a building frame with a hydraulic jack is installed on the first floor to support the weight of the building on the second floor or more, and after the first floor is dismantled, the jack is shrunk to lower the entire building. Temporarily joined the pillars of the second floor and the foundation pillars, and after the temporary joining, dismantled the floor lowered to the first floor,
In the method of dismantling a multi-story building by sequentially repeating this work, the temporary joining is performed by removing two columns from both sides of the pillar of the lowered floor and the foundation pillar.
The two U-shaped joint steel members are assembled together in the form of a steel tube column, the upper and lower openings of a pair of joint steel members in the form of steel tube columns are closed, and mortar grout is filled into this closed space. A method of temporarily joining columns at the time of building demolition using a jack system, which is performed by curing. 2. The method according to claim 1, wherein the two joining steel materials sufficiently surround both the column and the foundation column, are removed after grout hardening, and are diverted at the time of temporary joining of the column in the next dismantling operation. A method of temporarily joining columns at the time of building demolition using the jack system described in the above.