JP4571904B2 - Seismic reinforcement method using concrete blocks - Google Patents

Description

  The present invention relates to a seismic reinforcement method using a concrete block as seismic reinforcement for an existing building.

  Conventionally, as a method of seismically reinforcing an existing building, for example, as shown in FIG. 16, a reinforcing bar 12 is assembled and fixed to a column 4 or a beam 5 with an anchor bar 10 or a spiral bar 11 to cast concrete. There are known a construction method that reinforces and a construction method in which a wall is constructed by stacking blocks while being integrated with an adhesive in a surface surrounded by a column beam and a floor (see Patent Document 1). In addition, a reinforcing method is known in which a number of blocks made of iron short rectangular cylinders are stacked to construct a load-bearing wall, thereby improving the ease of construction and reducing the weight increase (see Patent Document 2).

Japanese Patent Laid-Open No. 10-292639 Japanese Patent Application Laid-Open No. 11-071907

However, in the conventional seismic reinforcement method by assembling concrete blocks or iron blocks, for example, in the assembling of blocks with adhesives, skill is required for variations in adhesive strength due to the construction of adhesives and handling of adhesives. Moreover, since all the blocks are bonded, the cost is increased.
On the other hand, in an iron block, since a bolt and a nut are used for joining of a square block, it takes time and effort. In addition, because the block at a specific location is filled with fillers such as mortar and concrete in the interior space, labor and cost increase, and an opaque wall is created by building the block, and the view between the rooms is poor and ventilation In addition to being inferior to daylighting, the interior is felt narrow for residents and users due to fine partitioning, and a feeling of blockage is felt.
The seismic reinforcement method using a concrete block according to the present invention has been proposed in order to solve such problems.

The gist for solving the above-mentioned problems of the seismic reinforcement method using the fiber-reinforced concrete block according to the present invention is to achieve a rectangular housing and a desired thickness provided diagonally in the internal space of the housing. A concrete block having a desired width composed of diagonal members and arcuate corners at the four corners of the frame, and a beam / column joint block in which a cotter protruding from the beam or column is inserted and a grout recess is provided. A pillar / floor joint block that is laid on a pillar or floor and has a through-hole penetrating vertically for grout injection and cotter insertion . In other words, the circular space portion or the semicircular space portion is assembled by interposing a cylindrical joining pin.
In addition, the concrete block is arranged in any one of a V shape, a double X shape, and an inverted V shape so as to correspond to the transmission of seismic force, and a rectangular frame and slant are placed in the other space. This includes disposing a simple unit block having only a frame without any material.

  According to the seismic reinforcement method using the fiber-reinforced concrete block of the present invention, a rectangular housing, a diagonal member having a desired thickness diagonally provided in the internal space of the housing, and arc-shaped corners at the four corners of the housing. The construction period is shortened, and there is no need for a large construction space. Earthquake-proof reinforcement work can be done.

  Thus, large-scale work such as attaching a formwork to a concrete block, disassembling it, and filling it with a pump car such as mortar as in the conventional method is not necessary in the present invention, and noise, vibration and dust There is no occurrence. Therefore, it is possible to perform seismic reinforcement work with peace of mind in hospitals, medical facilities, department stores, office buildings and the like that particularly dislike noise, vibration, and dust.

Even when the existing frame is SRC (steel reinforced concrete structure) and the reinforcing bar anchor cannot be placed, this reinforcement method is possible because only the concrete blocks are assembled.
Furthermore, since the concrete space has a through hole in the internal space except for the diagonal material portion, ventilation and daylighting are possible and the design is excellent.

Between the pillar or beam and the concrete block to be built, a joint block with a recess for inserting a cotter protruding from the pillar or beam is disposed, so that integration with an existing building is easy It becomes.
Since the concrete block is a high-strength fiber-reinforced concrete block, a sufficient reinforcing effect can be obtained in terms of strength.

  In the seismic reinforcement method using a concrete block according to the present invention, a concrete block (referred to as a unit block) 1 is first prepared. As shown in FIGS. 1A and 1B, the concrete block 1 includes a rectangular housing 1a, a diagonal material 1b having a desired thickness provided diagonally in the internal space of the housing 1a, As shown to 1 (C), it consists of the arc-shaped corner | angular part 1c of the four corners of the said housing 1a.

  The size of the unit block 1 is, for example, 400 × 400 mm in length and width and 160 mm in width. The thickness of the diagonal member 1b is 30 mm, and the frame member 1a of the casing is 20 mm. The concrete block 1 is a high-strength fiber reinforced concrete block.

  Next, as shown in FIGS. 2 (A) and 2 (B), a cotter protruding from the column or beam is inserted by being arranged between the column or beam and the unit block 1 to be assembled. A joint block 2 provided with a concave portion is prepared. For example, when the joining block 2 is for a pillar or laid on the floor, as shown in FIG. 2A, the joining block 2a has a through-hole 2c penetrating vertically for grout injection. As shown in FIG. 2 (B), the beam or column is a beam joint block 2b having a grout recess 2d. Moreover, the height h of this joining block 2 prepares several patterns, such as 120,180,240,300 (mm), for example, considering the height and grout allowance of the existing housing.

  The unit block 1 has the same width as the unit block 1 and is 160 mm. Furthermore, this joining block 2 is also a high strength fiber reinforced concrete block. The corner 2b is the same as the corner 1c.

  As shown in FIGS. 3 to 4, when the unit block 1 is assembled, the unit block 1 adjacent to either the top, bottom, left, or right of the unit block 1 has a central circular space or semicircular space. A real and cylindrical joining pin 3 is interposed. This joining pin 3 is a metal or high-strength fiber reinforced concrete block, the length is 160 mm in accordance with the width of the unit block 1, and its diameter is just equal to the circular space formed by the corner 1 c. It is a size that fits. The joining pin 3 is joined to the unit block 1 with an adhesive.

  In order to fix the joining blocks 2a and 2b, there is a steel pipe cotter 6 protruding from the pillar 4, the beam 5 and the floor 7 into the space as shown in FIG. As a result, the unit block 1 and the joining block 2 are joined to the existing frame (column 4, beam 5, floor 7).

  The seismic reinforcement method according to the present invention will be described using the unit block 1 and the joining block 2. First, as shown in FIG. 4, the necessary steel pipe cotters 6 are installed on the columns 4 and beams 5 and the floor 7 of the existing frame.

  Next, as shown in FIG. 5 to FIG. 6, a level mortar 13 is laid on the floor 7, and the joining block 2 a is installed in the horizontal direction while being bonded with an adhesive. And as shown in FIG. 7, grout mortar 14 is inject | poured from the through-hole 2c of the said joint block 2a. In addition, in the assembly of the joint blocks 2a and 2b and the unit block 1, the concrete blocks may be joined to each other by an adhesive or may not be used.

  Then, as shown in FIG. 8, the joining block 2b is placed as an adjustment block along the spacer 15 from the left end, and is fixed on the joining block 2a laid on the floor 7 while being fixed with an adhesive. Next, the unit blocks 1 are assembled along the construction direction in the figure. The joining pin 3 is joined to the adjacent unit block 1 with the adhesive at the corner 1c.

  Next, when the construction of the unit block 1 comes to the right end, the joining block 2a as the adjustment block is fitted into the steel pipe cotter 6 first. After the rightmost unit block 1 is inserted, the joining block 2a is moved to the left and pressed. By repeating this, as shown in FIG.

  As shown in FIG. 9, in the uppermost stage, on the left side, a joining block 2b as an adjustment block is arranged in advance on the steel pipe cotter 6 of the beam 5, the unit block 1 is inserted, and then the joining block 2b Drop. These are fixed with an adhesive. The preceding arrangement of the joining block 2b and the arrangement of the unit block 1 are repeated along the construction direction.

  As shown in FIG. 10, when the construction of the unit block 1 comes to the right end, the joining block 2a is preceded by the steel pipe cotter 6 of the column 4, and then the joining block 2b is arranged on the steel pipe cotter 6 of the beam 5. Then, the unit block 1 is inserted. Then, the joining block 2a is pressed leftward to drop the joining block 2b.

  Next, as shown in FIG. 11, side molds 16 are provided in the vertical direction at both left and right ends. Then, the grout mortar 14 is press-fitted from the bottom to the uppermost stage into the adjustment margin and the recesses and through holes of the joining blocks 2a and 2b.

  Furthermore, as shown in FIG. 12, the under beam formwork 17 is provided, and the grout mortar 14 is press-fitted therein. Thereby, the grout mortar 14 is filled in the space in the upper left and right corners, the adjustment allowance, and the recess 2d of the joining block 2b.

  As shown in FIG. 13, the existing building is seismically reinforced by the unit block 1, the joining blocks 2a and 2b, and the joining pin 3, so that the reinforcement strength is sufficient and the ventilation is good and the lighting is effective. Is an excellent reinforcement method.

  In this reinforcement work, since the unit blocks 1 are assembled and then the high-strength grout is simply poured with a simple facility, construction in a narrow work space is possible. Therefore, it is possible to minimize the movement and curing of equipment and household goods for the reinforcement work. In addition, since the reinforcement work can be easily performed while using the existing building, the working time is reduced, and the construction period is shortened to about 2/3 compared with the conventional method of reinforced concrete seismic wall, improving safety. .

  The strength of the unit block 1 is, for example, as shown in FIG. 14, when the frame size is 400 mm, the diagonal plate thickness is 40 mm, and the frame plate thickness is 20 mm with respect to the K-brace strength curve a. Is the intensity curve b, the diagonal plate thickness 60 mm, and the frame plate thickness 30 mm. With such strength, for example, when viewed at a deformation angle of 1/250, it can be seen that the unit block 1 has a yield strength equal to or greater than that of the K-type brace.

  Further, in the method of stacking concrete blocks, as shown in FIG. 15, as a basic type, the unit blocks 1 are stacked vertically and horizontally as shown in FIG. As shown in FIG. 15 (B), the unit block 1 is arranged in a V-shape in order to save waste in consideration of the transmission of force during an earthquake, as shown in FIG. 15 (C). In addition, as shown in FIG. 15 (D), a double X-type assembly is also proposed. In the other empty space, a simple unit block 8 having only a frame body without diagonal materials is formed. By doing in this way, while reducing the cost as a manufacturing cost of a concrete block, sufficient earthquake resistance is also ensured.

It is the front view, side view (B), and partial enlarged view (C) of the concrete block (unit block) 1 in this invention. It is a front view of the joining block 2 in the same invention. It is explanatory drawing of the reinforcement construction method by the unit block 1 which concerns on this invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing explaining the reinforcement construction method by the unit block 1 which concerns on the same invention. It is explanatory drawing of the reinforcement construction method by the concrete block which concerns on the same invention. FIG. 6 is a comparative curve diagram of load and deformation indicating the strength of the unit block 1. It is explanatory drawing (A) which shows the assembly of the unit block 1, and explanatory drawing (B), (C), (D) which shows another Example. FIG. 10 is an explanatory diagram showing an example of a seismic reinforcement method according to a conventional example, in which a wall is constructed with reinforcing bars 12;

Explanation of symbols

1 concrete block (unit block),
1a frame,
1b Diagonal material,
1c corner,
2 joint blocks,
2a Bonding block for floor,
2b Joint block for beams,
2c through hole,
2d recess,
3 Junction pins,
4 pillars,
5 Beam,
6 Steel pipe cotter,
7 floors,
8 Simple unit block,
10 anchor muscles,
11 Spiral muscles,
12 Rebar,
13 floor mortar,
14 grout mortar,
15 spacer,
16 side formwork,
17 Under beam formwork.

Claims (2)

A rectangular block, a diagonal material having a desired thickness provided diagonally in the internal space of the frame, and a concrete block having a desired width comprising arcuate corners at the four corners of the frame;
A cotter protruding from the beam or column is inserted, and a joint block for the beam and column provided with a recess for grout,
With a pillar / floor joint block that has a through-hole penetrating up and down for grout injection and cotter insertion, which is laid on a pillar or floor,
Stacking with a cylindrical joint pin interposed in a circular space part or semicircular space part at the corner by a concrete block adjacent to either the top, bottom, left or right;
Seismic reinforcement method using concrete blocks. The concrete block is arranged in any one of V shape, double X shape and inverted V shape to correspond to the transmission of seismic force, and there is no rectangular frame and diagonal in the other space Arranging simple unit blocks with only frames,
The earthquake-proof reinforcement method by the concrete block of Claim 1 characterized by these.

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