JPH0784762B2 - Steel column base fixing method - Google Patents

Description

The present invention relates to a method for fixing a steel column base to a column foundation.

[Prior Art and its Problems] The conventional method of fixing a steel column base is as shown in FIG.
There were (A) root winding method, (B) embedding method, and (C) exposed type method.

In the (A) root winding method, the footing, part of the rising part of the column base and the underground beam are first placed, the strength of the concrete is confirmed, then the steel column is erected, and after the main tightening, the root This is a method of placing rolled concrete.

In addition, the (B) embedding method is a method in which after confirming the concrete strength of the footing, the steel frame columns are erected, and after final tightening, the underground beams are constructed.

Further, in the above (C) exposed type construction method, first, an anchor frame for fixing the column base is installed, and after confirming the concrete strength, the steel frame column is erected, the strain is corrected, and the anchor bolt is tightened. This is the construction method.

However, the above-mentioned (A) root wrapping method is not preferable in terms of design, since the root wrapping portion is exposed, and concrete must be post-applied to the root wrapping portion, which causes a problem that the construction period becomes longer. is there.

Further, in the (B) embedding method, since the steel frame is erected in the state where the column base is cut off, the feet are bad and it is not preferable for safety, and there is a case where the erection gantry is required.
It is difficult to cut the underground beam, formwork, and reinforcing bar work after constructing the steel frame, and since it is built with the column base cut off, a heavy machine with a large working radius is required, After construction, steel erection is performed before rising the column base and before constructing the underground beam, so there is a risk that steel frame production may not be in time, and if the installation of heavy erection equipment is near the root, Yamadome steel is required. There is a problem.

Further, the above-mentioned (C) exposed method has a problem that the diameter of the anchor bolt is large and the anchor frame requires cost and labor.

[Object of the Invention] The present invention has been made in order to solve the problems of the above-mentioned conventional method. The object of the present invention is to form a box punch hole reliably and accurately, and further, to make a basket type. Not only can you set the exact mounting position of the base plate when setting the frame, but you can also set the anchor bolts at the same time, providing a steel column pedestal fixing method that can improve work accuracy and efficiency To do.

[Structure of the Invention] The method of fixing a steel column base of the present invention is a method of constructing a basket formwork in which four corners and upper and lower frames are assembled in a box form and a net formwork is stretched around the box form. After setting the upper pillar foundation position and adjusting the level of the upper frame of the basket formwork, concrete of the underground girder is placed and a box punch hole is formed by the basket formwork, and after hardening of the concrete , Inserting the column base of the steel column into the box removal hole, and fixing the base plate of the steel column to the anchor bolt attached to the upper frame,
It is characterized in that the space between the column base of the steel column and the hole in the box is filled with concrete to fix the steel column to the underground beam.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is waste concrete, 2 is split stone 2
In addition, the cage form 3 for removing the box is installed at the pillar foundation position above it.

As is clear from FIG. 2, the basket form 3 has four corner angles 3a and upper and lower angles 3b, 3c assembled in a box shape.
Vertical and horizontal reinforcing members 3d are arranged between them, and a net form 3e is stretched around and around the reinforcing members 3d. Above reinforcement 3d
Is to prevent clogging during concrete pouring, and depending on the size of the cage form 3, rebars of various thicknesses, FB,
An angle material or the like is appropriately selected and used. Net type 3e above
May be rib lath, punching metal, expanded metal, or the like. The upper angle frame 3b serves as a base plate receiver for the steel frame pillar when it is built, and has a mounting hole 3b 'for mounting an anchor bolt for building. Further, the upper angle 3b substitutes for the level mortar when constructing the steel frame.
As shown in an enlarged view in FIG. 2A, an adjusting bolt 3f for level adjustment is attached to the lower end of the basket formwork 3. In addition, a vibration-proof material 3g is attached to the basket form 3.

When the basket form 3 is set, next, as shown in FIG. 3, the base reinforcement 4 is arranged below the basket form 3 and the foundation standing columnar reinforcement 5 is arranged on the side. When the pillar is a side pillar or a corner pillar, it is advisable to insert a horizontal anchor bar or the like to increase the degree of fixing the pillar base. The base muscle 4 is a cage form 3
You may arrange the bar before setting. Subsequently, the anchor bolt 6 is attached to the hole 3b ′ formed in the upper angle 3b of the basket form 3, and the reinforcing bar 7 for the underground beam and the column hoop bar 8 are arranged to form the foundation column and The formwork of the underground beam is assembled, and concrete C is placed as shown in FIG. In this case, the precast concrete C is partially extruded from the mesh of the net formwork 3e of the basket formwork 3 and can be integrated with the postcasting concrete described later. In addition, if necessary, the cage form 3 may be subjected to an entrapment prevention process (not shown) by a pier or the like.

After the precast concrete C is hardened, the form of the foundation pillar mold and the underground beam is disassembled and backfilling is performed. It should be noted that, until the steel column is built, as shown in FIG. 5, the upper opening portion of the box removing portion formed by the basket formwork 3 is covered with a suitable curing lid 9 such as a veneer plate or an iron plate. Make sure that work and safety are protected so that dirt and dust do not enter.

Then, as shown in FIG. 6, steel pillars are placed in the cage form 3.
Insert the column base of 10 and tighten the base plate 10a to the anchor bolt 6 to correct the steel frame and then fully tighten.

Finally, as shown in FIG. 7, the space C between the column base and the cage form 3 is filled with concrete C ′ around the column base to fix the steel column 10. Before placing concrete C ', inspect the box removal area and clean the sand, trees, and other harmful substances.

When the steel frame is a box column, as shown in FIG. 8, a hole 11a for concrete pouring is provided above the column base of the box column 11, and a concrete filling hole is also provided at the lower end. Leave 11b open.

In the above embodiment, the case of the steel frame structure was described, but in the case of the steel frame reinforced concrete structure, it is preferable to use the cage form 12 as shown in FIG. As is clear from FIG. 9A, the basket form 12 has column main bars 13 arranged inside the net form 12a and hoop lines 14 arranged outside. The column main bar 13 and the hoop bar 14 also function as vertical and horizontal reinforcing members for the basket form 12, respectively.

The column main bar 11 is inserted into the upper and lower angles 12b and 12c, and is threaded at the lower end and fixed by tightening with a nut. Therefore, the main pillar bars 13 are arranged in a precise position.
The net form 12a may be stretched outside the hoop muscles 14 and the corner angles 12d.

According to the method of the present invention, when there is no underground, since it is possible to construct a steel column after backfilling the column foundation and the underground beam, there is no need to construct a scaffold, and there is no need to construct a column. The heavy equipment can be freely carried into the premises, and in particular, as shown in FIG. 10, since the slab can be constructed before the steel column is installed, there is an advantage that the steel column can be installed as a scaffolding for the slab. Yes, the construction cost and construction period are greatly reduced. Also,
When there is underground, the reverse construction method can be used together as shown in the figure.

[Advantages of the Invention] (1) Since the net formwork is securely and stably held by the corner frame, it is possible to reliably and accurately form the box punching hole, and if necessary, the corner frame is provided on the corner frame. However, there is an advantage that a reinforcing material for preventing entrapment can be attached.

(2) Since the base plate of the steel frame column is supported by the level-adjusted upper frame, and at the same time, it is fixed to the anchor bolts protruding from the upper frame, so that the correct mounting position of the base plate can be set when setting the cage form. Not only can it be set, but the anchor bolt can also be set at the same time, improving the accuracy and efficiency of the work.

[Brief description of drawings]

Fig. 1 is a diagram showing the basket formwork set on the waste container,
2 is a perspective view showing an embodiment of a basket formwork, FIG. 2A is a partially enlarged view thereof, FIG. 3 is a view showing various bar arrangement states, and FIG. 4 is a view showing a concrete precasting state, FIG. 5 is an explanatory view showing a curing lid of the box-extracting part, FIG. 6 is a view showing an installed state of a column base of a steel column, and FIG. 7 is a view showing a built-up fixed state of the steel column, FIG. 8 is a view showing a built-in state of a box column, FIG. 9 is a perspective view of a cage frame for steel-framed reinforced concrete, FIG. 9A is a horizontal sectional view thereof, and FIG. 10 is an explanatory view of the effect of the present invention method.
FIG. 11 is an explanatory view showing a conventional column fixing method. 1 ... Waste concrete, 2 ... Splitting, 3 ... Basket formwork,
3a …… Corner angle, 3b, 3c …… Upper and lower angles, 3
b ′ …… Mounting hole, 3e …… Net formwork, 3d …… Reinforcement material, 3
f …… Adjust bolt, 3g …… Vibration prevention material, 4 …… Base reinforcement, 5 …… Foundation upright column reinforcement, 6 …… Anchor bolt, 7 …… Underground beam reinforcement, 8 …… Column hoop reinforcement, 9 …… Curing lid, 10 …… Steel column, 10a …… Base plate, 11 ……
Box pillar, 11a …… Concrete pouring hole, 11b ……
Filling hole, 12 …… basket form, 12a …… net form, 12b, 12c…
... angle, 12d ... corner angle, 13 ... column main bar, 14 ... hoop bar, C, C '... concrete.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Honda 5-2-33 Nagatsuda, Midori-ku, Yokohama-shi, Kanagawa (56) References JP-A-59-192145 (JP, A) SAIKAI 59-6105 (JP) , U) Japanese Patent Sho 61-4458 (JP, B2)

Claims (1)

[Claims] 1. A basket formwork, which is constructed by assembling four corners and upper and lower frames into a box-shape and surrounding them with a net formwork, is installed at a column foundation position on waste concrete, and
After adjusting the level of the upper frame of the basket formwork, concrete of underground girder is cast to form a box punching hole by the basket formwork, and after hardening of the concrete, a column of a steel column in the box punching hole. Insert the legs and fix the base plate of the steel column to the anchor bolt attached to the upper frame, fix the steel column to the underground beam by filling the gap between the column base of the steel column and the box hole with concrete. The method of fixing the steel column base, which is characterized by