JP3396000B2 - Anchor construction method and anchor device - 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 construction method used for a column base fixing device for fixing a steel column of a building to a concrete foundation, and an anchor device used for the construction method.

[0002]

2. Description of the Related Art When anchor bolts are embedded in foundation concrete in the work of fixing steel column bases, it is practically extremely difficult to accurately embed the anchor bolts at the marking position of the steel column. For this reason, in the actual construction work, it is necessary to bend the bolt portion protruding from the basic concrete in accordance with the bolt hole formed in the base plate on the column base side, which is so-called remodeling. Therefore, in order to omit this troublesome work of repairing the table,
The bottom of the anchor plate is divided into two parts, the anchor bolt consisting of a conventional one, with the anchor plate sandwiched between it and the part of the anchor rod that is embedded in the concrete, and the part of the tightening bolt that projects above the basic concrete. There is widely used a construction method in which an anchor device in which an anchor rod is welded is embedded in a foundation concrete, and then a bolt is welded to an accurate marking position on the upper surface of the anchor plate (Japanese Patent Laid-Open No. 50- 78107
Issue).

FIG. 7 shows a concrete example using the conventional construction method. In the figure, 1 is an anchor plate, and this anchor plate 1 and the anchor plate 1
An anchor rod 2 is welded to the lower surface of the anchor plate 2, and a tightening bolt 3 is welded to the upper surface of the anchor plate 1 to form an anchor device. Anchor rod 2
Is the anchor plate 1 beforehand at the factory or the site.
It is welded to the lower surface of the steel plate, and in this state, it is fixed to the installation position of a steel frame column on waste concrete (not shown), and it is buried at a predetermined position by placing the foundation concrete 4. However, as described above, in the actual construction work, it is difficult to accurately match the embedding position of the anchor rod 2 with the bolt insertion hole 7 of the base plate 6 welded to the lower portion of the steel column 5 by the above work. In many cases, there is a gap. Therefore, at the stage where the bolt 3 is welded to the upper surface of the anchor plate 1 and erected, the accurate positioning is performed again from the marking position of the steel column 5, and the welding position of each bolt 3 is indexed accordingly. . After the bolts 3 are welded, the level mortar 8 having a predetermined height is formed at a predetermined position on the foundation concrete 4 through the opening formed in the anchor plate 1, and the bolts 3 are placed on the level mortar 8. The steel frame pillar 5 is placed while being inserted into the bolt insertion hole 7 of the base plate 6, and is tightened and fixed by the nut 9. Thereafter, the gap between the base plate 6 and the anchor plate 1 is filled with grout material or the like, and the work of fixing the column base of the steel column 5 is completed. As described above, according to this construction method, when the bolt 3 is welded to the anchor plate 1, it can be readjusted to an accurate marking position, so that the eccentricity of the anchor rod 2 is different from that of the welding position of the bolt 3. Absorbed by adjustment.

[0004]

However, in the above-mentioned prior art, when welding the bolt to the anchor plate, a method for directly and visually confirming the eccentricity with the anchor rod welded to the lower surface is particularly required. Since it was not taken, it was difficult to accurately recognize the eccentricity of the welding position of the anchor rod and the bolt to proceed with the work. For this reason, in practice, the amount of eccentricity may become larger than expected, and there is a drawback that a problem occurs in strength due to a problem in transmission of the tensile resistance force. The present invention has been made in view of the circumstances of the conventional art as described above, and an object thereof is to, when welding a bolt to an anchor plate, a welding position of an anchor rod welded to a lower surface thereof. There is a measure to check the amount of eccentricity at a glance, thereby solving the problem of the tensile strength of the anchor device.

[0005]

According to the present invention, a mark indicating the amount of eccentricity of an anchor rod welded to the lower surface of the anchor plate from the welding position is previously attached to the upper surface of the anchor plate, and the bolt is welded. At that time, the welding is performed after confirming that the eccentric amount between the bolt and the anchor rod is within an allowable range based on the mark. As the mark, a concentric circle mark indicating the eccentric amount from the welding position of the anchor rod and a circular mark indicating the allowable eccentric amount are attached.

[0006]

As described above, when there is a gap between the anchor rod welded to the lower surface of the anchor plate and the bolt welded to the upper surface of the anchor plate, the tensile force acting on the bolt and the tensile resistance force generated on the anchor rod. Since eccentricity occurs between the and, when the amount of eccentricity exceeds a certain level, a problem in tensile strength as the anchor device occurs. According to the present invention, when the bolt is welded to the anchor plate, whether the eccentric amount from the welding position of the anchor rod and the eccentric amount are within the allowable range based on the mark provided on the upper surface of the anchor plate. After confirming at a glance,
Welding can be done.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The anchor device in the present invention is composed of an anchor plate 1, an anchor rod 2 welded to the lower surface of the anchor plate 1, and a tightening bolt 3 welded to the upper surface of the anchor plate 1, There is basically no difference from the conventional one shown in FIG. As a concrete welding means, a so-called sap (SA) which is a combination of a stud welding method and a latent arc welding method is used.
P) Welding method or the like is used. Also, the anchor rod 2
For example, a deformed steel bar is used. 1 and 2 show an embodiment of an anchor device according to the present invention.
1 is a plan view and FIG. 2 is a front view. As shown in FIG. 1, in this anchor device, the anchor plate 1
Is characterized in that four marks 10 are attached to the upper surface of each of the anchor rods 2 corresponding to the welding positions of the anchor rods 2 welded to the lower surface thereof. The mark 10 includes a cross-shaped mark 11 and a plurality of concentric circular marks 12. The intersection of the cross-shaped marks 11 indicates the axial center position of the anchor rod 2. Further, the circular marks 12 are concentrically drawn with a total of six circular marks from the innermost circular mark 12a to the outermost circular mark 12f at predetermined intervals, for example, about 5 mm. It is configured as a line scale so that the amount of eccentricity from the axial center position of the anchor rod 2 can be immediately determined at a glance. Further, the maximum eccentricity allowed at the same time may be displayed by the outermost circular mark 12f. In the figure, 1
Reference numeral 3 denotes a circular opening. Through this opening 13, the leveling mortar 8 is formed on the foundation concrete 4 at a predetermined height as shown in FIG.

3 to 6 show a specific example of a marker for attaching the mark 10 and its usage.
FIG. 3 is a plan view of the marker, and FIG. 4 is a front view thereof. As shown, the marker 14 is composed of a disc portion 15 and a handle portion 16. A conical tip 17 for positioning is provided in the center of the disc portion 15, and a cross slit 18 and an arc slit 19 are formed around the conical tip 17. The arcuate slit 19 is
With the conical tip 17 at the center, the radius of the innermost slit 19a is set to, for example, about 15 mm, and further, 6 circles are concentrically formed at regular intervals of about 5 mm. . Also, the outermost slit 19f
Is set to a circular size indicating the maximum allowable eccentricity. The conical tip 17 is a conical tip made of hardened steel or the like, and may be in a state of being fitted into a hole formed in the central portion of the disc portion 15 as shown in a partially enlarged view of FIG. It is fixed by attachment.

Therefore, when the mark 10 is provided on the anchor plate 1 using the present marker 14, the marker 14 is placed at the welding position of the corresponding anchor rod 2 on the anchor plate 1, as shown in FIG. They are placed together, and the paint is sprayed from above using a paint spray cylinder 20 or the like. As a result, the cross-shaped mark 11 and the circular mark 12 are provided at predetermined positions on the surface of the anchor plate 1 through the cross-shaped slit 18 and the arc-shaped slit 19.
The mark 10 consisting of is added. By sequentially repeating this for each anchor rod 2,
Each mark 10 will be drawn as shown in FIG.

Next, the work procedure of this construction method will be described. First, punching work of the welding position of each anchor rod 2 to the anchor plate 1 is performed. In this work, a pattern showing the welding position of each anchor rod 2 is placed with the lower surface of the anchor plate 1 facing up, the pattern pattern is aligned with the left, right, front and back of the anchor plate 1, and a punch is used to make a recess at each welding position. Is formed by forming. After that, a rust or the like is removed by applying a sander or the like around the recess formed by punching, that is, the welding position, and the anchor rod 2 is welded to each welding position. After this welding, the welding position of each anchor rod 2 is measured and punched at each corresponding position on the upper surface of the anchor plate 1. Thereafter, using the marker 14, the conical tip 17 is sequentially fitted into each recess by punching and positioned, and as described above, the paint spray cylinder 2
Repeat the spraying work using 0 or the like. As described above, as a result, each mark 10 is drawn as shown in FIG. In the above work procedure, after the anchor rod 2 is welded, the punching on the upper surface side of the anchor plate 1 is actually performed, but the pattern paper itself is used to punch the corresponding position of the anchor rod 2. May be. The work up to this point is usually performed in a factory.

Next, the anchor plate 1 having the anchor rods 2 welded to the lower surface, which has been carried into the site, is fixed to the installation position of each steel frame column 5 on a waste concrete (not shown), and then the foundation concrete 4 is poured. . As a result, each anchor rod 2 is embedded at a predetermined position in the foundation concrete. Then, the welding operation of the tightening bolt 3 is started. First, the bolts 3 are marked on the anchor plate 1 and punched. In this case, based on the circular mark 12, the degree of eccentricity of each punching position from the welding position of the anchor rod 2 and the amount of eccentricity can be determined at a glance. As a result, if the eccentricity is within the allowable range, the following bolts 3 will be welded. If it is outside the allowable range of eccentricity, that is, the outermost circular mark 12
If a recess due to punching is located outside f,
It is assumed that there is a problem with the position where the anchor rod 2 is buried, and a corrective measure will be taken to deal with it.

When it is confirmed that the marking position of each bolt 3 is within the allowable eccentricity range with respect to the welding position of each corresponding anchor rod 2, a sander or the like is put around the punching position to rust or the like. Then, the bolt 3 is welded. Thereafter, as shown in FIG. 7, the level mortar 8 having a predetermined height is provided at a predetermined position on the foundation concrete 4.
Is formed, on which the steel columns 5 are placed while inserting the respective bolts 3 into the bolt insertion holes 7 of the base plate 6,
It is the same as in the conventional case that the work of fixing the column base of the steel column 5 is completed by tightening and fixing with the nut 9 and then filling the gap between the base plate 6 and the anchor plate 1 with grout material or the like.

In the above description of the embodiment, as an example of the mark 10, the mark is a cross mark 1.
Although the case where the mark is composed of one and six circular marks 12 has been described, a mark set such as a mark composed of only the circular mark or a mark using only the outermost circular mark indicating the maximum allowable eccentricity as the circular mark. Various modifications are possible in terms of matching and number. Further, as a marking method, not only a method of spraying a paint but also a method of irradiating a laser beam, affixing a mark sticker, or using a stamp may be used. Further, the conical tip 17
Instead of this, a hole may be formed in that portion, and the recess may be formed by punching through the hole, that is, the punch hole may be checked while performing positioning.

[0014]

According to the present invention, when the bolt is welded to the anchor plate with a simple structure, the amount of eccentricity from the welding position of the anchor rod and whether or not the amount of eccentricity is within the allowable range can be determined at a glance. be able to. Therefore, the problem of the tensile strength of the anchor device caused by the eccentricity between the anchor rod and the tightening bolt can be uniformly set within a certain allowable range.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a plan view showing a marker.

FIG. 4 is a front view of the marker.

5 is a partially enlarged view of FIG.

FIG. 6 is a diagram showing a usage state of a marker.

FIG. 7 is a vertical cross-sectional view showing a conventional construction state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Anchor plate, 2 ... Anchor rod, 3 ... Tightening bolts, 4 ... Foundation concrete, 5 ... Steel column, 6
... base plate, 7 ... bolt insertion hole, 8 ... level mortar, 9 ... nut, 10 ... mark, 11 ... cross mark, 12 ... circular mark, 13 ... opening, 14 ... marker, 15 ... disk part, 16 ... Handle part, 17 ... Conical tip, 18 ... Cross slit, 19 ... Arc slit, 2
0 ... Paint spray cylinder

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-49850 (JP, A) Japanese Patent Publication No. 50-13575 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02D 27/00

Claims (3)

(57) [Claims] 1. An anchor plate is welded to a lower surface of an anchor plate, embedded in a predetermined position of basic concrete, and then a bolt for tightening is welded to a marking position on an upper surface of the anchor plate to thereby weld the anchor. In the anchor construction method that absorbs the deviation between the embedding position of the rod and the marking position of the bolt, a mark indicating the amount of eccentricity from the welding position of the anchor rod is previously attached to the upper surface of the anchor plate, and the bolt is attached. When welding, the anchor construction method is characterized in that, based on the mark, it is confirmed that the amount of eccentricity between the bolt and the anchor rod is within an allowable range, and then welding is performed. 2. An anchor plate having an appropriate number of anchor rods welded to its lower surface is provided with a concentric mark indicating the eccentricity from the welding position on the upper surface of the anchor plate. Characterized anchor device. 3. A circular mark indicating an allowable amount of eccentricity around the welding position of the anchor rod is attached to the upper surface of an anchor plate having an appropriate number of anchor rods welded to the lower surface. Anchor device.