JP3453895B2 - How to install anchor bolts on large steel frames - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor bolt installation method for a large steel frame.

[0002]

2. Description of the Related Art Generally, in a nuclear facility as shown in FIG. 11, a large steel frame 2 having a device 1 such as an air-cooled heat exchanger is required to have high seismic resistance against earthquakes and the like. I am trying to install it on top. In addition, in the figure, 4 is a main pillar that constitutes the large steel frame 2,
Reference numeral 5 is a main beam arranged between the main columns 4.

When mounting such a large steel frame 2 on a reinforced concrete structure 3, an anchor bolt is required to fix the large steel frame 2 to the reinforced concrete structure 3, and the anchor bolt is installed. A method that has been conventionally adopted in the above will be described with reference to FIGS.

First, a formwork (not shown) is placed in a hole excavated in the ground, and as shown in FIGS. 12 and 13, a floor 6 and a wall 7 provided on the upper surface of the floor 6 are driven to form a reinforced concrete structure. The building 3 is constructed, and a plurality of supporting works 8 adjusted to substantially the same height as the walls 7 are arranged on the floor 6 of the reinforced concrete structure 3, and the end portions in the circumferential direction on the supporting works 8 are the walls. A bottom formwork 9 for a horizontal flat plate-shaped ceiling slab that contacts the inner surface of 7 is arranged.

After arranging the bottom mold 9, the upper surface of the wall 7 and the upper surface of the bottom mold 9 shown in FIG.
As shown in (1), a vertical member 10 made of steel is erected and fixed by welding to an attachment metal 11 which is embedded in the upper surface of the wall 7 of the reinforced concrete structure 3 in advance or an attachment structure 11 on the formwork 9.

Further, as shown in FIG. 16, lower end streaks 12a are arranged at a lower position of the vertical member 10 at a required pitch, and after the reinforcing work is completed, the vertical member 10 is beamed to the beams 13a, 13b, 1.
Reinforced by 3c, 13d and brace 14, vertical member 10
The upper end streak 12b is arranged at a required pitch above the position.

When the work of arranging the upper end bar 12b is completed, the anchor bolt insertion hole 1 formed in the beam 13d described above.
An anchor bolt 17 extending in the vertical direction is inserted through 7b, and a retaining template 19 is fixed to a lower end of the anchor bolt 17 by a nut 20 so as to connect two adjacent anchor bolts 17, and then the retaining template 19 is retained. The template 19 for welding is fixed to the beam 13c by welding, and the anchor bolt 17 is inserted into the anchor bolt fixing hole 17a of the angle member 15 and fixed by the nut 18, and the two adjacent ends of the vertical member 10 are fixed. The angle member 15 is arranged so as to connect the vertical members 10 to each other to form the box-shaped embedded metal member 16 as a whole. Then, Figure 1
As shown in FIG. 6, the side form 22 for the ceiling slab 21 is installed on the outer periphery of the reinforced concrete structure 3 so that the embedded metal fitting 16 is substantially housed therein.

When the above work is completed, ready-mixed concrete of a required thickness is projected into the spaces in the bottom mold 9 and the side molds 22 so that the upper part of the vertical member 10 of the embedded metal 16 and the upper part of the anchor bolt 17 project. When the ready-mixed concrete has been hardened, the support 8 is removed, the forms 9 and 22 are removed, and the ceiling slab 21 is formed (see FIG. 18). After forming the ceiling slab 21, the angle member 15 of the embedded metal piece 16 is removed.

Further, as shown in FIG. 19, the reinforcing bars 23 are arranged in a required direction at a required pitch on a portion of the upper surface of the ceiling slab 21 where the upper portion of the anchor bolt 17 is projected, so that the reinforcing bar 2
After arranging the plane rectangular form frame 24 so as to surround 3 and the anchor bolt 17, the concrete concrete of a required thickness is poured into the form frame 24 so that the upper end of the anchor bolt 17 is projected. Once cured, the form 2
4 is removed to form the base 25.

After the foundation table 25 is formed, the main pillars 4 of the large steel frame 2 suspended by a crane or the like (not shown) are lowered, and as shown in FIG. 20, the anchor bolts protruding from the upper surface of the foundation table 25. 17 is inserted into the fixing hole 2a formed in the base plate 2b of the main pillar 4 of the large steel frame 2, the main pillar 4 is placed on the foundation table 25, and the nut 26 screwed to the anchor bolt 17 is inserted. The anchor bolts 17 and the main pillars 4 are fastened to each other to establish the main pillars 4 on the foundation table 25, and then the main beams 5 are arranged between the main pillars 4 to construct the large-scale steel frame structure 2. .

[0011]

However, although the portion of the reinforced concrete structure 3 which becomes the ceiling slab 21 is supported by the support work 8 via the bottom form 9 during concrete pouring, the concrete is not supported. When placing, the concrete may bend downward due to its own weight (Fig. 20).
Medium, the state indicated by the chain double-dashed line C), in which case the embedded hardware 16
Embedded hardware 16 installed on the bottom mold 9
The anchor bolts 17 fixed to the embedded metal fitting 16 are tilted to tilt integrally with the ceiling slab 21, and in this state, the anchor bolts 17 are attached to the main pillars 4 of the large steel frame structure 2.
If the bolts are fixed, it becomes difficult to attach the main beam 5 formed in advance to the size between the main columns 4 of the large steel frame 2 in a factory.

Since the anchor bolts 17 for fixing the main pillars 4 are fixed to the embedded metal article 16, it is necessary to arrange the embedded metal articles 16 by the number of the main pillars 4,
Therefore, a large number of embedded hardware 16 are required, and since the embedded hardware 16 is assembled locally, the assembly work is troublesome and the construction period of the large steel frame 2 is prolonged.

[0013] The present invention has been made in view of the circumstances described above, concrete
Anchor bolt accompanying bending of the ceiling slab by placing the toe
It is an object of the present invention to provide an anchor bolt installation method for a large-scale steel frame structure, which can prevent the inclination of the large-scale steel frame structure and reliably and quickly construct a large-scale steel frame structure.

[0014]

The first means of the anchor bolt installation method for a large-scale steel frame structure of the present invention is a plurality of box girder sill embeddings embedded on the wall of a reinforced concrete structure so that the upper part thereof projects. Stand the box girder upright on the upper surface,
Arranged with planes fit a plurality of templates each having an anchor bolt fixing holes on each main pillar standing設地point of large steel frames
Each anchor with shaped lattice-like box girder, pre SL and fixed by placing on each box girder posts, inserting the plurality of anchor bolts extending vertically in the anchor bolt fixing hole formed in the template The bolt is hung and fixed to the template by a nut, and in the formwork arranged in a box shape so as to surround the box girder support pillar and the anchor bolt, ready-mixed concrete for forming a ceiling slab is poured and the anchor bolt's It embeds the bottom in the ready-mixed concrete, anchor
The main pillar of a large steel frame can be fixed to the bolt installation position.
A foundation stand is formed and the concrete ceiling
The inclination of the anchor bolt due to the bending of the lab depends on the box girder.
Mainly used for large steel frames because it is prevented by rigidity.
Beams are pre-formed between the main columns to secure a large steel frame as a foundation
Can be placed in .

The second means of the present invention is that a box girder support is erected on the upper surface of a plurality of box girder support embeddings embedded in the wall of a reinforced concrete structure so that the upper part thereof projects, and anchor bolts are fixed. Plane shape with multiple templates with holes for each main column of large steel frame
The template with Jo is a grid box girder, pre SL and fixed by placing on each box girder posts, inserting the plurality of anchor bolts extending vertically in the anchor bolt fixing hole formed in the template The anchor bolt is inserted through the anchor bolt supporting hole formed in the fixing member of the anchor bolt guide attached below the anchor bolt, and each anchor bolt is hung and fixed by the nut with the template, and the box girder strut and the anchor bolt are fixed. a mold frame arranged in a box shape so as to surround, by injecting fresh concrete to form the ceiling slab embeds the lower part of the anchor bolt into the fresh concrete, the arrangement position of the anchor bolt, large steel frames
Form the basis platform that can secure the main pillars of the structure, the concrete
Anchor bolt accompanying bending of the ceiling slab by placing the toe
The inclination of the box girder is prevented by the rigidity of the box girder.
The main beam of the large steel frame is pre-formed between the main columns
The frame structure can be reliably placed on the foundation .

[0016]

In the first and second means of the present invention, the anchor bolts are suspended and supported by the box girders supported by the box girder struts through the template to pour concrete, and the plan shape is since lattice box girder comprises a rigid,
Box girder even if by pouring the concrete sagged ceiling slab under its own weight is not be modified, resulting in ceiling scan
Even if the lab is deformed, the inclination of the anchor bolt is prevented.
Also, box girder struts have good only provided at locations to support the box girder
Therefore , the number of installations can be significantly reduced compared to the number of main columns of a large steel frame , and as a result, the work of assembling the box girder columns can be completed in a short period of time.
And can shorten the construction period of large steel frame
It In addition, the anchor bolts are made up of box girders and ceiling slabs.
Since it does not incline due to flexure, the size between the main columns of a large steel frame
Even if the main beam is formed in accordance with the
Placed on the foundation and, as a result, the main beam is securely placed between the main columns.
You can

Further, in the second means of the present invention, since the anchor bolt can be inserted and supported in the anchor bolt supporting hole of the fixing member provided at the lower end of the vertical member of the anchor bolt guide, the anchor bolt can be supported. Will be supported at the upper and lower two points of the template attached to the box girder and the fixing member attached to the anchor bolt guide, so that the inclination of each anchor bolt can be prevented more reliably.

[0018]

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

1 to 10 show an embodiment of an anchor bolt installation method for a large-scale steel frame structure according to the present invention. The same parts as those shown in FIGS. 12 to 20 are designated by the same reference numerals. And detailed description thereof will be omitted.

As shown in FIG. 1, when the floor 6 (see FIG. 12) of the reinforced concrete structure 3 and the wall 7 integral with the floor 6 are constructed, a plurality of upper parts of the portion which will become the wall 7 after the concrete is placed. 2 (the position shown by B in FIG. 2 and not interfering with the main pillar 4 standing point A of the large-scale steel frame 2), the box girder strut embedded hardware 28 is disposed, and the box girder strut embed The wall 7 is formed by pouring concrete so that the upper end of the metal fitting 28 projects upward.

Thus, in this embodiment, first, a plurality of supporting works 8 adjusted to substantially the same height as the walls 7 are arranged on the floor 6 of the reinforced concrete structure 3, and the supporting works 8 are surrounded by the circumference. After arranging the bottom formwork 9 for the horizontal flat plate-like ceiling slab 21 whose end in the direction contacts the inner surface of the wall 7 (FIG. 12,
(See FIG. 13), steel anchor frame legs 29 are erected on the upper surface of the embedded metal article for box girder 28.

Further, as shown in FIG. 3, the lower end streak 30a
And each of the anchor frame legs 29 is reinforced by the beam 31 and the brace 32 while arranging the upper end reinforcements 30b at a required pitch, and two adjacent anchor frame legs 29 are connected to the upper ends of the anchor frame legs 29. The angle member 33 is attached so that the anchor frame leg 29, the beam 31, the brace 32, and the angle member 3 are attached.
3 forms a box-shaped box girder support 34.

Further, as shown in FIGS. 4 and 5, the main girder 35 made of I-shaped steel is arranged so that the flange 35a is oriented horizontally and the web 35b is oriented vertically. Bracket made of I-shaped steel extending in a direction orthogonal to
Is welded to the bracket 36, and a reinforcing girder 37 made of I-type steel is fastened to the bracket 36 with a gusset plate 38 and bolts 39 to form a box girder 40 having a grid-like planar shape in advance in a size that can be transported in a factory.

A template 42 having anchor bolt fixing holes 41 (4 pieces per sheet) is formed on the lower surface of the box girder 40, and the main pillar 4 standing point A of the large steel frame 2 (see FIG. 2). ), And each box girder 40 transported to the site is placed on the upper surface of the box girder post 34 and fixed to the box girder post 34 with the box girder fixing bolts 43 as shown in FIG. To do.

Further, a substantially horizontal plate having a vertical member 44 extending downward and a lower end of the vertical member 44 at a substantially central position on the lower surface of the template 42 and having an anchor bolt supporting hole 45 as shown in FIG. An anchor bolt guide 47 composed of a fixed member 46 is attached, and the anchor bolt 17 extending vertically is inserted into the anchor bolt fixing hole 41 of the template 42 and the anchor bolt supporting hole 45 of the fixing member 46, The anchor bolt 1
7 Template 4 by nut 48 screwed on the upper end side
The anchor bolt 17 is suspended and fixed to the template 42 by sandwiching the anchor bolt 1 from above and below.
As shown in FIG. 8, a retaining template 19 is attached to the lower end of 7 through the supporting hole 19a, and the anchor bolt 17
The anchor bolt 17 and the retaining template 19 are sandwiched and fixed from above and below by the nut 20 screwed to the lower end.

After the fixing work of the anchor bolts 17 is completed, the side formwork 22 for the ceiling slab 21 is arranged on the outer periphery of the reinforced concrete structure 3 so as to surround the box girder post 34, and the bottom formwork 9 and the side formwork. The raw concrete of a required thickness is poured so that the lower part of the anchor bolt 17 is embedded in the box-shaped space formed by 22, and after the raw concrete has hardened, the support 8 is removed and the formwork 9 and 22 are removed. Remove to form the ceiling slab 21.

After the ceiling slab 21 is formed, as shown in FIG. 9, the reinforcing bars 23 are arranged at the positions where the anchor bolts 17 are arranged at a required pitch, and a planar rectangular form 24 is arranged to form the form 24. A concrete concrete having a required thickness is poured into the inside so that the upper end of the anchor bolt 17 protrudes, and when the concrete is hardened, the form 24 is removed to remove the base 25.
To form.

After that, the box girder fixing bolt 43 for fixing the box girder support 34 and the box girder 40 and the nut 48 for fixing the anchor bolt 17 and the template 42 are removed, and the base 25 is removed. The vertical frame 44 of the anchor bolt guide 47 protruding from the upper surface is cut to remove the box girder 40, and the anchor frame leg 29 of the box girder post 34 protruding from the upper surface of the ceiling slab 21 is cut and cut. Remove leg 29.

Then, the main column 4 of the large steel frame 2 suspended by a crane (not shown) is lowered, and the anchor bolt 17 is inserted into the fixing hole 2a formed in the base plate 2b of the main column 4 to insert the main column. 4 is installed on the base 25 through the base plate 2b, and then the anchor bolt 17
The nut 26 on the portion of the base plate 2b protruding above.
The main pillar 4 is fixed to the foundation table 25 by screwing, and the main beam 5 is arranged between the main pillars 4 erected on the foundation table 25, and the large steel frame structure is provided on the reinforced concrete structure 3. Build 2.

Therefore, in this embodiment, the box girder 40 has a rigidity higher than that of the reinforcing bar 12 even when the portion which becomes the ceiling slab 21 is bent by its own weight during concrete pouring. Since the anchor bolts 17 fixed to the box girder 40 via the template 42 do not incline due to the bending of the ceiling slab 21, the main pillars 4 of the large-scale steel frame 2 are preliminarily set in the factory. Even if the main beam 5 is formed according to the size of the space, the main beam 5 can be reliably arranged between the main columns 4.

The anchor bolts 17 are the template 42 attached to the box girder 40 and the anchor bolt guides 4.
Since it is supported at two points above and below the fixing member 46 attached to 7, the inclination of each anchor bolt 17 can be prevented more reliably.

Furthermore, since the number of box girder struts 34 need only be arranged on the reinforced concrete structure 3 to support the box girders 40, the number can be greatly reduced compared to the number of main columns 4 of the large-scale steel frame structure 2. The work of assembling the box girder support 34 is performed in a short time, and the construction period of the large-scale steel frame structure 2 is shortened.

In the embodiment of the present invention, the case of assembling the box girder column 34 on site while performing the reinforcement work for the ceiling slab 21 has been described.
4 may be preassembled in a factory or the like, then transported to the site and arranged, and then the bar arranging work for the ceiling slab 21 may be performed. In addition, various modifications are made within the scope not departing from the gist of the present invention. Of course you can get it.

[0034]

According to the first and second aspects of the present invention, the anchor bolt is supported by the box girder support.
The box girder is hung and supported through the template
In addition to placing REIT, box girders with a grid-like plan
Since it has rigidity, the ceiling is made of cast concrete.
Even if the slab bends under its own weight, the box girder will not deform.
Even if the ceiling slab is deformed as a result, the anchor bolt
Tilt can be prevented. Also, the box girder supports the box girder.
Since it only needs to be installed in a place to hold, it is the main
Compared to the number of columns, the number of installations can be greatly reduced, and as a result, the front
The assembly work of the box girder column is carried out in a short time, and the large steel frame structure is
The construction period can be shortened. Furthermore, anchor bolt
The box girder does not tilt due to the bending of the ceiling slab.
, The main beam is formed according to the dimension between the main columns of the large steel frame
Even if you do, place a large steel frame on the foundation and
In addition, the main beam can be reliably arranged between the main columns. Further, in the invention of claim 2, since the anchor bolt can be inserted and supported in the anchor bolt supporting hole of the fixing member provided at the lower end of the vertical member of the anchor bolt guide, the anchor bolt can be supported. Since the template attached to the girder and the fixing member attached to the anchor bolt guide are supported at two points above and below, the inclination of each of the anchor bolts can be more reliably prevented, and various excellent effects can be obtained. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a state in which anchor frame legs are erected on an embedded metal article for a box girder strut in an anchor bolt installation method for a large steel frame structure of the present invention.

FIG. 2 is a partial plan view showing an example of a box girder used in the anchor bolt installation method for the large-scale steel frame structure of the present invention.

FIG. 3 is a vertical cross-sectional side view showing a state in which a box girder column and a reinforcing bar for a ceiling slab are arranged in an anchor bolt installation method for a large steel frame structure of the present invention.

FIG. 4 is a partial cross-sectional plan view of the template mounting portion of the box girder of FIG.

5 is a view taken in the direction of the arrows VV in FIG.

FIG. 6 is a vertical cross-sectional side view showing a state in which a box girder to which an anchor bolt is fixed is arranged on a box girder support in the anchor bolt installation method for a large-scale steel frame structure of the present invention.

FIG. 7 is an enlarged arrow view in the VII-VII direction of FIG.

FIG. 8 is an enlarged view in the direction of arrows VIII-VIII in FIG.

FIG. 9 is a vertical cross-sectional side view showing a state in which a base is formed on a ceiling slab in the anchor bolt installation method for a large steel frame structure of the present invention.

FIG. 10 is a vertical cross-sectional side view showing a state in which a main column is erected after installing the anchor bolt in the method for installing the anchor bolt of the large-scale steel frame structure of the present invention.

FIG. 11 is a vertical cross-sectional side view showing an example in which a large-scale steel frame structure is installed on a reinforced concrete structure.

FIG. 12 is a vertical cross-sectional side view showing a construction state of floors and walls of a reinforced concrete structure.

13 is a view taken in the direction of arrow XIII-XIII in FIG.

FIG. 14 is a plan view showing an arrangement position of main columns of a conventional large-scale steel frame structure.

FIG. 15 is a vertical cross-sectional side view showing a state in which a vertical member is arranged in a conventional anchor bolt installation method for a large-scale steel frame structure.

FIG. 16 is a vertical cross-sectional side view showing an arrangement state of an embedded metal object to which an anchor bolt is fixed in a conventional method of installing an anchor bolt for a large steel frame.

FIG. 17 is an enlarged perspective view showing an upper portion of the embedded metal article shown in FIG. 16.

FIG. 18 is a vertical cross-sectional side view showing a state in which a ceiling slab is formed on a reinforced concrete wall in a conventional anchor bolt installation method for a large-scale steel frame structure.

FIG. 19 is a vertical cross-sectional side view showing a state in which a foundation pedestal is formed on a ceiling slab in the conventional anchor bolt installation method for a large-scale steel frame structure.

FIG. 20 is a vertical cross-sectional side view showing a state in which a main column is erected on a foundation table in a conventional anchor bolt installation method for a large steel frame.

[Explanation of symbols]

2 Large steel frames 3 reinforced concrete structures 4 primary posts 5 main beam 7 wall 9 a bottom mold 17 the anchor bolt 21 the ceiling slab (slabs) 22 side forms 25 underlying base 28 box girder embedded hardware 34 box girder struts 40 boxes upright Girder 41 Anchor bolt fixing hole 42 Template 43 Bolt (box girder fixing bolt) 45 Anchor bolt supporting hole 46 Fixing member 47 Anchor bolt guide 48 Nut A Main pillar standing point

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04B 1/41 502 E02D 27/00

Claims (2)

(57) [Claims] 1. A box girder support is erected on the upper surface of a plurality of box girder support embedded in the wall of a reinforced concrete structure so that the upper part protrudes, and a plurality of templates having anchor bolt fixing holes are large-sized. Box girders having a grid-like planar shape arranged in accordance with the main pillar standing points of the steel frame are placed and fixed on each of the box girder columns, and anchor bolt fixing holes formed in the template A plurality of anchor bolts extending in the up-down direction, and each anchor bolt is hung and fixed to the template by a nut, and the ceiling slab is placed in a box-shaped form surrounding the box girder column and anchor bolts. injecting mixed concrete to form a embeds the lower part of the anchor bolt into the fresh concrete, the arrangement position of the anchor bolt, large iron
Forming a foundation table that can fix the main columns of the frame structure, and flexing the ceiling slab by the concrete casting
Anchor bolt tilt is prevented by the rigidity of the box girder
By doing so, the main beam of the large steel frame is
An anchor bolt installation method for a large-scale steel frame, which is characterized in that the large-scale steel frame can be securely placed on the foundation table . 2. A box girder support is erected on the upper surface of a plurality of metal fittings for box girder support embedded in the wall of a reinforced concrete structure so that the upper part protrudes, and a plurality of templates with anchor bolt fixing holes are large-sized. Box girders having a grid-like planar shape arranged in accordance with the main pillar standing points of the steel frame are placed and fixed on each of the box girder columns, and anchor bolt fixing holes formed in the template A plurality of vertically extending anchor bolts, and the anchor bolts are inserted through the anchor bolt supporting holes formed in the fixing member of the anchor bolt guide attached below the template, and each anchor bolt is attached to the template by a nut. A concrete block for forming a ceiling slab, which is suspended and fixed in a box and is placed in a box-shaped form surrounding the box girder support and anchor bolts. By injecting the REIT embeds the lower portion of the anchor bolt in the ready-mixed concrete, anchor bolts
A base that can fix the main pillar of a large steel frame to the installation position
A table is formed, and it accompanies the bending of the ceiling slab due to the placement of the concrete.
Anchor bolt tilt is prevented by the rigidity of the box girder
By being previously the main beam of large steel frames between primary post
An anchor bolt installation method for a large-scale steel frame, which is characterized in that the large-scale steel frame can be securely placed on the foundation table .