JP2775330B2 - How to rebuild buildings using steel columns - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION The invention of this application relates to a method of rebuilding a building using a steel column, particularly an auxiliary independent foundation that uses an existing independent foundation and is installed slightly apart from the existing independent foundation. The law relates to the renovation of buildings using steel columns.

2. Description of the Related Art A building using a steel column, for example, a building 1 long in the girder direction such as an arcade as shown in FIG. 10 to FIG.
Is independently foundation 2A with the first base column constructed at intervals L ₁
And the distance between the independent foundation 2A of the first foundation row and
At a L _2, the second base column is formed by an independent basis 2B constructed at the interval L _1, steel columns 4A, 4B the first and second respective independent basis 2A of base column, 2B of Built on top and fixed,
Each steel column 4 built on independent foundations in the first and second foundation rows
Girder beams 5A and 5B are attached to A and 4B, and girder beams 5A and 5
A beam 6 is bridged with a gap L ₃ in the girder direction between
A skeleton of the building 1 is formed, and a roof, a cover, and the like are attached to the skeleton to build the building. When rebuilding this long building 1 in the girder direction, the existing independent foundations 2A and 2B are removed, a new foundation is built there, and a new steel column is built on the foundation.

Problems to be Solved by the Invention According to the conventional renovation method, when rebuilding a building larger than an existing building on an existing independent foundation,
Although the vertical force acting on the foundation can be made smaller than that of existing buildings by reducing the weight of finishing materials, etc., for example, if the floor height is increased, the horizontal force acting on the building during an earthquake or strong wind will be reduced. As the number of falls increases, the overturning moment for overturning the independent foundation increases, and the existing independent foundation alone cannot cope with the overturning moment. Therefore, the existing foundation has been removed and a large independent foundation has been established. However,
Removing the existing independent foundation is a laborious and time-consuming task, and constructing a new large independent foundation requires a lot of effort and resources.

The problem to be solved by the present invention is to provide a method of remodeling a building using a steel column without the above-mentioned disadvantages,
In other words, use an existing independent foundation to eliminate its removal work, and use a steel column that can minimize the labor and materials by providing a new auxiliary independent foundation slightly away from the existing independent foundation An object of the present invention is to provide a method for remodeling a building.

Means for Solving the Problems The invention of this application employs the following configuration as means for solving the above problems.

The structure of the present invention is based on a method of rebuilding a building constructed using steel columns built on an independent foundation, by removing members on the ground such as steel columns and newly adding an auxiliary independent foundation slightly apart from the existing independent foundation. As a new steel column of the building after installation and renovation, use a steel column with a steel base connecting beam almost perpendicular to the longitudinal direction at the bottom of the steel column, and place the new steel column on the existing independent foundation Building, the lower part of the steel column is fixed to the existing independent foundation, and the receiving part near the free end of the steel foundation connecting beam is fixed to the auxiliary independent foundation, and the new steel column is a rebuilt building such as a beam There is a method of rebuilding a building that uses steel columns to attach the members.

For existing independent foundations after removal of ground members such as steel columns, for example, drill holes at two or more predetermined positions using a drill or other drilling machine, insert a metal rod into this hole, The metal rod is fixed to the independent foundation using an adhesive, a mortar, or the like so that the threaded bar on the metal rod projects from the upper surface of the independent foundation. The lower portion of the new steel column can be fixed to the existing independent foundation using the screw bar.

The auxiliary independent foundation, which is provided slightly apart from the independent foundation, in a preferred embodiment comprises a precast reinforced concrete foundation block, but can also be constructed from cast-in-place reinforced concrete. Increasing the distance L ₄ between the center of the independent foundation and the center of the auxiliary independent foundation, it is possible to cope with a large horizontal force by a small auxiliary independent basis.

As a new steel column, a steel foundation tether is provided at the lower part of the steel column at a right angle to the longitudinal direction of the steel column, and fixed to the lower part of the steel column and the receiving part near the free end of the steel foundation tether. Use one with some means. For the steel column, for example, an H-section steel, a square steel, a round steel, or the like is used.

The fixation of the lower part of the steel column to the existing independent foundation and the fixation of the receiving part of the steel foundation tether and the auxiliary independent foundation is, in a preferred embodiment, a penetration of the lower part (for example the base) of the steel column. Holes, screw rods of existing independent foundations, nuts, through holes of receiving parts, screw rods of auxiliary independent foundations, nuts, etc., so that a part of them is exposed to existing independent foundations and auxiliary independent foundations. It is also possible to embed an iron member and fix the lower portion of the steel column or the receiving portion of the steel frame connecting beam to an exposed portion of the iron member by appropriate fixing means such as welding.

The auxiliary independent foundation will be installed inside or outside the rebuilt building. The location is determined according to the purpose of the building, the conditions around the existing independent foundation, and the like.

When the upper surface of the steel frame connecting beam of the new steel column is disposed below the inner floor surface or the outer ground surface of the reconstructed building, the steel frame connecting beam does not interfere.

Although the present invention will be described as a method of rebuilding a building using a steel column, the idea of using an auxiliary independent foundation and a steel foundation connecting beam can also be applied to a case where a building is newly constructed using a steel column. . In the case of new construction, the existing independent foundation becomes the main independent foundation.

The remodeling method of the present invention is to provide a new auxiliary independent foundation slightly apart from the existing independent foundation, fix the lower part of the new steel column to the existing independent foundation, and close to the free end of the steel foundation connecting beam. Since the receiving part is fixed to the auxiliary independent foundation, the height of the building after renovation is increased, the horizontal force acting on the building during an earthquake or strong wind increases, and the overturning moment acting on the independent foundation increases However, since the overturning moment is received not only by the existing independent foundation but also by the auxiliary independent foundation via the steel frame connecting beam, a large horizontal force can be handled only by newly installing a small auxiliary independent foundation.

Embodiment 1 The first embodiment is shown in FIGS. 1 to 5, and is an example in which the renovation method of the present invention is applied to an arcade (that is, a building that is long in the direction of the girder) and the renovation is performed without changing the distance between pillars. is there.

The difference between the refurbished arcade 10 and the unrenovated arcade 1 shown in FIGS. 8 to 10 is that the arcade is tall (or the weight of the upper part of the arcade or the area where the wind hits is large). It is.

Remove the roof, covering, etc. of the arcade 1 before renovation, remove the beams 6, beams 5A and 5B, remove the steel columns 4A and 4B, etc., and expose the upper surfaces of the existing independent foundations 2A and 2B. Foundation 2
A mortar is struck on the upper surfaces of A and 2B to make the upper surfaces horizontal.

Next, using a drill or other drilling machine, the existing independent foundation 2A
Holes 12a are vertically formed at two or more predetermined positions. This hole 12a
Then, after injecting an adhesive 12b such as epoxy resin, insert a metal rod 12c such as a bolt having a screw portion 12c ₁ at an upper part,
As threaded rod portion 12c ₁ is so as to protrude from the upper surface of the independent basic 2A, to fix the metal bar 12c independently underlying 2A. For Independence foundation 2B, to protrude from the upper surface in a similar manner providing the threaded rod portion 12c _1.

Excavate the ground inside the arcade slightly away from the existing independent foundations 2A and 2B and provide auxiliary independent foundations 13A and 13B.

The auxiliary independent foundations 13A and 13B are formed as follows. A crushed stone is placed at the bottom of the excavated hole, the ground is compacted, and a precast reinforced concrete foundation block 13a is placed on the compacted ground. The discarded concrete is struck on the compacted ground, a reinforcing bar is placed on the discarded concrete, the perimeter of the reinforcing bar is surrounded by a form plate, and a screw bar is provided at an upper end at two or more predetermined positions of the reinforcing bar. after fixing the iron bar there is a part 13c _1, and Da設concrete into the formwork, the auxiliary independent foundation 13A, may be formed to 13B.

When using the precast foundation block 13a as the auxiliary independent foundations 13A and 13B, the screw rod portion 13c ₁ is used as the foundation block 13a.
When protruding from the top of the
Use the one buried 13c in the basic block, or in the predetermined two or more positions of the precast basic block 13a,
Drill a hole using a drill or other drilling machine, and inject an adhesive such as epoxy resin into the hole.
c Insert a metal rod 13c such as a bolt with ₁ into the screw rod 13c
Use a fixed one so that ₁ protrudes from the upper surface of the base block 13a.

Steel columns 14A building 10 after renovation, 14B is constituted by a steel pillar 14a and the H-shaped steel foundation tie beam 14b of rectangular steel, length H ₂ of steel pillars bodies of steel columns before renovation length It is longer than H _1. The steel rectangular base 14c is fixed by welding to the lower end surface 14a ₁ of the steel pillar 14a. Pass the fixed rod 12c through the predetermined position of the base 14c 2
Previously drilled holes 14c ₁ above. One end face 14b ₁ of the steel base connecting beam 14b is connected to the inner side face 14a ₂ of the lower part of the steel column 14a.
Welded and fixed. The H-shaped steel of the steel foundation connecting crossbeams 14b, the width of the flange 14b ₂ is to use substantially equal to the length of one side of the square steel steel pillar 14a, the steel foundation tie beam 14b of the flange 14b ₂ below The base and the base 14c are flush with each other. Receiving part 1 of auxiliary independent foundation of steel frame connecting beam 14b
4b ₃ is the lower flange 14b ₂ near the free end of the beam 14b
It consists of. The receiving unit 14 a predetermined position of the _third flange is passed through the threaded rod portion 13c ₁ 2 or more a through hole 14b _4. In addition,
The configuration of the steel column 14B is the same as that of the steel column 14A.

On each of the existing independent foundations 2A and 2B, build the steel columns 14A and 14B on each of the existing independent foundations 2A and 2B, and receive
4b ₃ is placed on the upper surface of the auxiliary independent foundation, and the through hole 14c _{1 of the} base 14c is provided.
Threaded rod portion 12c of the fixed metal rod 12c to the existing independent foundation ₁
Through the through hole 14b ₄ of the receiving part 14b ₃
13A, through the threaded rod portion 13c ₁ of 13B. And the screw rod portion
Screw nuts 12d and 13d into 12c ₁ and 13c ₁ to make each steel column 14
A and 14B are fixed to the existing independent and auxiliary independent foundations. Girder beams 15A and 15B are attached to the upper part of each steel column 14A and 14B, and beams are spaced between beams 15A and 15B in the girder direction.
Over 16 bridges, 10 arcade skeletons are formed, roofs and covers are attached to this skeleton, and existing independent foundations 2A, 2B,
The auxiliary independent foundations 13A, 13B and the steel foundation connecting beam 14b are backfilled to the same level as the ground surface 18 outside the arcade 10, and the floor 17 of the arcade 10 is flattened to complete the arcade 10. .

As shown in Fig. 3, during an earthquake or strong wind, arcade
The horizontal forces P ₁ and P ₂ acting on 10 are increased and the existing independent foundation
Even when the overturning moments M ₁ and M ₂ acting on 2A and 2B are large, the overturning moments M ₁ and M ₂ are not only received by the reaction forces Q ₁ and Q ₂ acting on the bottom surface of the existing independent foundation, but also , through the steel foundation connecting crossbeams 14b, auxiliary independent foundation 13A, because receive any reaction force R _1, R ₂ which act on the bottom surface of the 13B, a small auxiliary independent basis
A large horizontal force can be accommodated only by newly installing 13A and 13B.

The second embodiment is shown in FIGS. 6 to 9, in which the rebuilding method of the present invention is applied to a one-story factory that is long in the girder direction, and the factory is taller than the old factory without changing the column spacing. Here is an example of remodeling.

The difference between the factory 20 after the renovation and the arcade of the first embodiment shown in FIGS. 1 to 5 is that:
A and 23B are provided outside the factory, the steel columns 24a of the new steel columns 24A and 24B are made of H-shaped steel, and the H-shaped steel frame base connecting beam 24b is formed on the outer surface 24a ₂ of the lower outer flange. The other is that the end 24b ₁ is fixed, and (b) the roof is formed by bridging the triangular truss beam 24 between the steel columns 24A and 24B. If it is the same as the example, the description is omitted.

Effect of the Invention The remodeling method of the present invention is to provide a new auxiliary independent foundation a little apart from the existing independent foundation, fix the lower part of the new steel column to the existing independent foundation, and receive the steel foundation connecting beam of the new steel column. Since the part is fixed to the auxiliary independent foundation, the height of the building after renovation becomes large, the horizontal force acting on the building at the time of earthquake or strong wind increases, and the overturning moment acting on the independent foundation Even if becomes large, the overturning moment is received not only by the existing independent foundation but also by the auxiliary independent foundation via the steel foundation connecting beam, so it is possible to cope with a large horizontal force only by newly installing a small auxiliary independent foundation. Can and is very economical.

The existing independent foundation and auxiliary independent foundation threaded rods are protruded, through holes are provided in the lower part of the steel column and the receiving part of the steel foundation connecting beam, and new steel columns are connected to the existing independent foundation and nuts using nuts. Fixing to the auxiliary independent foundation facilitates the fixing work and improves the implementability. Further, according to the present invention, since the auxiliary independent foundation can be made small, a precast foundation block can be used, and the foundation work can be made dry.

[Brief description of the drawings]

1 to 5 show a first embodiment. FIG. 1 is a plan view of an arcade body, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a view of FIG. FIG. 4 is an enlarged side view of the main part of FIG. 3, and FIG. 5 is a plan view of the main part of FIG. 4 taken along the line II-II. 6 to 9 show a second embodiment.
6 is a side view of the skeleton of the factory shown in FIG. 7 taken along the line III-III, FIG. 7 is a plan view of FIG. 6, and FIG.
Figure is an enlarged side view of the main part of Fig. 6, Fig. 9 is a plan view of Fig. 8 taken along the line IV-IV, and Figs. Indicate the
FIG. 10 is a plan view, FIG. 11 is a front view of FIG. 10, and FIG.
FIG. 12 is a side view of FIG. 10 taken along the line VV. In the figure, 1 is an arcade, 2A and 2B are existing independent foundations,
4A and 4B are steel columns, 10 is a refurbished arcade, 20 is a rebuilt factory, 12a is a hole drilled in an existing independent foundation, 12b is an adhesive, 12c is a metal rod, 12c ₁ is a threaded rod, 13A , 13B, 23A and 23B are auxiliary independent foundations, 13c and 23c are metal rods, 13c ₁
And 23c ₁ are threaded rods, 14A, 14B, 24A and 24B are new steel columns, 14a and 24a are steel columns, 14b and 24b are steel base connecting beams, 14c and 24c are bases, 14c ₁ are through holes, 14b Numerals ₃ and 24b ₃ are receiving portions, and numerals 14b ₄ and 24b ₄ are through holes.

Claims (8)

(57) [Claims] (1) In a method of rebuilding a building constructed using a steel column built on an independent foundation, a ground member such as a steel column is removed, and an auxiliary independent foundation is newly provided slightly apart from the existing independent foundation. The new steel column is to be built on an existing independent foundation, using a steel column with a steel foundation connecting beam approximately perpendicular to the longitudinal direction at the bottom of the steel column as the new steel column of the rebuilt building The lower part of the steel column is fixed to the existing independent foundation, and the receiving part near the free end of the steel foundation connecting beam is fixed to the auxiliary independent foundation. A method of rebuilding a building using steel columns, characterized by attaching a pillar. 2. A method for rebuilding a building constructed using a steel column built on an independent foundation, removing a ground member such as a steel column and placing a drill or the like at two or more predetermined positions on an existing independent foundation. Drill a hole using a drilling machine, insert a metal rod into this hole, and fix the metal rod to the independent foundation with an adhesive so that the threaded bar at the top protrudes from the upper surface of the independent foundation. A new auxiliary independent foundation is provided slightly apart from the foundation, and a threaded rod is projected at two or more predetermined positions as this auxiliary independent foundation, and two or more through holes are drilled at predetermined positions as new steel columns. The fixed base is fixed to the lower end of the steel frame, and one end of the steel frame connecting beam is fixed to the lower portion of the steel frame substantially at right angles to the longitudinal direction thereof. Using a new steel column with the existing independent foundation, Built on top, the through hole of the foundation of the new steel column passes through the threaded bar of the existing independent foundation, the through hole of the receiving part of the steel foundation connecting beam of the new steel column passes through the threaded bar of the auxiliary independent foundation, and Screw the nut into the threaded rod, fix the lower end of the steel column of the new steel column to the existing independent foundation, fix the receiving part of the steel foundation connecting beam to the auxiliary independent foundation, and attach the beam to the new steel column. A method for rebuilding a building using a steel column, comprising attaching a member of the building after the rebuilding. 3. The method for rebuilding a building using a steel column according to claim 1, wherein the auxiliary independent foundation is provided inside the building after the rebuilding. 4. The method for rebuilding a building using a steel column according to claim 1, wherein the auxiliary independent foundation is provided outside the building after the rebuilding. 5. The structure according to claim 1, wherein an upper surface of the steel frame connecting beam of the new steel column is located lower than an inner floor surface or an outer ground surface of the reconstructed building. A method of remodeling a building using a steel column as described in one item. 6. A steel base connecting beam is provided at a lower portion of the steel column substantially at right angles to a longitudinal direction of the steel column, and is fixed to a lower portion of the steel column and a receiving portion near a free end of the steel base connecting beam. A steel column comprising a part of 7. In a building constructed using a steel column built on an independent foundation, an auxiliary independent foundation is provided slightly apart from the main independent foundation, and a longitudinal direction is provided below the steel column as a steel column of the building. A steel column with a steel foundation tether that is approximately perpendicular to is used, and the steel column is built on the main independent foundation,
The lower part of the steel column is fixed to the main independent foundation, the receiving part near the free end of the steel foundation connecting beam is fixed to the auxiliary independent foundation, and the structural members such as beams are attached to the steel column. A building using steel columns, characterized by the following. 8. A first foundation row is formed by constructing main independent foundations at predetermined intervals, and a second foundation row spaced from each main independent foundation of the first foundation row. A row is formed by building the main independent foundations at predetermined intervals, a steel column is erected on each main independent foundation of the first and second foundation rows, and an independent one of the first and second foundation rows is formed. A girder beam is attached to each steel column built on the foundation, between the girder beams or the first beam.
Alternatively, in a long building in the girder direction in which a beam is bridged at intervals in the girder direction between the steel columns built on the independent foundations of the second foundation row and the frame of the building is formed, Metal rods are provided at two or more predetermined positions of the main independent foundations of the second base row so that their threaded rods protrude from the upper surface of each main independent foundation; An auxiliary independent foundation is provided slightly apart from the foundation, and a metal rod is provided at two or more predetermined positions of the auxiliary independent foundation so that its screw rod portion protrudes from the upper surface of the auxiliary independent foundation. The lower part of the body is provided with two or more through holes, and the lower part of the steel column is provided with a steel base connecting beam substantially at right angles to the longitudinal direction thereof.
The ones with the above through holes are used, steel columns are built on each main independent foundation, the screw rod part of the main independent foundation is passed through the lower hole of the steel column, and the steel column foundation of the steel column is connected The threaded rod of the auxiliary independent foundation is passed through the through hole of the beam receiving part, a nut is screwed into each threaded rod part, the lower part of the steel column is fixed to the main independent foundation, and the receiving part of the steel foundation connecting beam is A building using a steel column, wherein the building is fixed to an auxiliary independent foundation, and a member such as a beam is attached to the steel column.