JPH0718253B2 - Setting method and setting device for anchor bolts for steel columns - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an anchor bolt setting method and a setting device used for building a steel column at a predetermined position on a foundation concrete in the construction work of a steel structure building.

(Prior Art) First, a general structure of foundation concrete and a set state of anchor bolts will be described with reference to FIGS. 11 and 12. First
In the bottom of the excavated hole in Fig. 11, a stone 8 was laid and a discarded concrete 1 with a thickness of about 50 mm was placed.
Foundation concrete is placed on it. The basic concrete is composed of a square lower base concrete portion 13 and a square columnar concrete portion 14 having a smaller area. A manju 19 for adjusting degree is provided. In the base concrete, the lower base reinforcement 2, the L-shaped upright column main reinforcement 5, the beam reinforcement 7 for the underground beam of FIG. 12 and the like are embedded, and, for example, four anchor bolts 9 are embedded. There is. The column main bar 5 and the beam bar 7 are bound by a hoop bar 6.

A base plate 18 having an anchor bolt insertion hole is integrally provided at the lower end portion of the steel column 17, and the base plate 18 is placed on the manju 19 at the time of erection and is fixed to the upper portion of the anchor bolt 9 while being horizontally adjusted.

It is necessary to set and fix the anchor bolts 9 at accurate positions with respect to the pillar cores C1 and C2 for determining the pillar positions in the beam-to-beam direction H6 and girder row direction K before placing the concrete foundation. is there.

As an anchor bolt setting method, conventionally, there are a method of setting after the reinforcement and the formwork are installed and a method of setting before the reinforcement and the formwork.

First, the former set method after rebar arrangement will be described.

(A) Before rebar arrangement, marks (posterior ink) of each pillar core C1 and C2 are made on the upper surface of the discarded concrete 1 by a black system.

(B) Next, the base reinforcement 2, the column main reinforcement 5, and the beam reinforcement 7 are laid out, and the concrete formwork 11, 12 is assembled.

(C) Base plate on top of pillar formwork 12 as shown in FIG.
A template (gauge) 21 having the same shape as that of 18 is arranged, and the template 21 is positioned according to the ground ink of the pillar core on the discarded concrete by lowering it and fixed to the template 12.

(D) Then, the anchor bolt 9 is suspended in a predetermined hole 22 of the template 21, and the lower end portion of the anchor bolt 9 is fixed by welding to the column main bar or the like.

However, such a construction method has the following problems.

(A) Since the anchor bolt 9 is placed after the reinforcement,
As shown in the figure, the column main bars 5 and the beam bars 7 become an obstacle, and it takes time to construct the anchor bolt 9 at a predetermined position.

In particular, when it becomes impossible to place the beam 7 at a predetermined position by hitting the beam bar 7, it is necessary to heat the anchor bolt 9 and bend it to a predetermined position after pouring the concrete, that is, so-called re-mounting. However, this reworking work cannot be actually performed because the strength of the anchor bolt is reduced.

(B) The ground ink of the pillar core C1 and the pillar core C2 is attached to the upper surface of the discarded concrete 1, and the template 21 is installed by lowering it to the upper position accordingly, so the ground ink on the discarded concrete 1 is confirmed. Since it is difficult and the swinging of the lowering swings, it takes a lot of time to perform the centering work of the column, and the setting position of the anchor bolt 9 tends to be inaccurate.

(C) Since the surface of the abandoned concrete 1 has many irregularities and obstacles and the like are often projected, it is troublesome to accurately hit the pole stick ground ink on the upper surface thereof. Further, rain, groundwater, etc. are likely to collect on the upper surface of the discarded concrete 1, which may cause the ground ink to disappear.

Next, the latter set-up method before rebar arrangement will be described with reference to FIG. Before rebar arrangement, the ground ink of each pillar core C1 and C2 is attached on the discarded concrete 1 by the ink thread, and the frame base 26 is fixed on the discarded concrete 1 by the nail 25 or the like.
Template (gauge) 21 with anchor bolt 9 attached on top
Is arranged, and the template 21 is positioned in accordance with the pillar core mark on the discarded concrete 1 by the lowering 28.

However, even in this method, since ground ink is attached as a pillar core mark to the upper surface of the discarded concrete 1, the same problems as those described in (b) to (d) above occur.

(Object of the Invention) It is an object of the present invention to provide a setting method and a setting device of an anchor bolt for a steel column, which can set the anchor bolt in a predetermined position easily and accurately.

(Technical Means for Achieving the Purpose) In order to achieve the above-mentioned object, the present invention is to fix vertical piles in four corners of each column installation place before bar arrangement in a range wider than the cross section of the column form, and to carry the girder. A pair of primary transfer members facing each other in the direction of the beam or the direction between the beams are fixed to the upper part of the vertical pile at the same horizontal level, and the primary transfer member is connected to the primary transfer member. Mark the primary column core extending in the direction
The pair of secondary transfer members are laid over and fixed on the primary transfer member in a cross beam shape, and the secondary transfer member is marked with a secondary pillar core extending in a direction perpendicular to the primary pillar core. An upper surface template is fixed on the secondary transfer member with the pillar core as each center in the beam direction and column direction, and a plurality of anchor bolts are suspended on the upper surface template, and the lower end portions of the anchor bolts are fixed by steadying. I am trying.

(Embodiment) FIGS. 3 to 10 sequentially show the process of installing the setting device according to the setting method according to the present invention, and FIGS. 1 and 2 show the state when the setting of the anchor bolt is completed. The setting method will be described with reference to the drawings.

(A) In FIG. 3 and FIG. 4, 4 of each column installation location
Drive four vertical piles 30 made of angle material into the corners, and cast waste concrete to secure it securely. Vertical pile 30 in this case
Is about 300 mm, for example, and concrete is discarded 1
Has a thick wall (100 mm or more) around the vertical pile 30.

Each vertical pile 30 is arranged within the range of the base concrete part 13, but in order to easily install the pillar formwork and the beam formwork later, from the forming range of the pillar form concrete part 14 to the beam direction H and the girder row. It is separated by a constant distance D (for example, 200 mm or more) in the direction K.

After fixing the vertical piles 30 as described above, a level ink L is attached to each vertical pile 30 at a height corresponding to the position of the bottom surface of the base plate.

(B) In FIG. 5 and FIG. 6, a pair of transfer members 31 made of an angle member are arranged so as to face each other at intervals in the column direction K, and are made to have the same height by the level ink L, respectively. Align horizontally and weld to vertical pile 30. That is, the respective primary transfer members 31 face each other in the column direction K at intervals and are set horizontally and at the same height.

Next, the primary pillar core C1 for setting the beam interval for determining the pillar position in the beam-to-beam direction H is measured by transit, and the primary transfer core 31 is marked with the primary pillar core mark G1. At this time, the marks G1 are simultaneously attached to the primary transfer members 31 at all the column installation positions arranged in the column row direction K.

(C) In FIGS. 7 and 8, 1 made of square pipe material is used.
The pair of secondary transfer members 32 are laid across in parallel to each other on the primary transfer member 31, and are positioned symmetrically with a predetermined interval W in the beam direction H with the primary pillar core C1 as the center (symmetry plane). Weld to the primary transfer member 31. The predetermined distance W is a dimension corresponding to the width of the upper surface template 35 in the inter-beam direction H, which will be described later.

Next, a secondary column core C2 for setting column columns for determining the column position in the column direction K is measured by a transit, and a secondary column core mark G2 is attached to the secondary transfer member 32. At this time, the marks G2 are simultaneously attached to the secondary transfer members 32 at all the column installation locations arranged in the beam direction H.

(D) In FIGS. 9 and 10, the upper surface template 35 mounted on the secondary transfer member 32 is formed in the same shape as the base plate (18 in FIG. 11) at the lower end of the steel column, and its surface For example, each positioning center line having a width in the beam direction and a width in the girder direction is provided in a cross shape, and four anchor bolt insertion holes 36 are formed at accurate positions with respect to the center line. Further, a steamed bun hole 37 is formed in the center.

The upper surface template 35 having such a shape is placed on the secondary transfer member 32,
The center line of the width between beams of the upper surface template 21 is aligned with the primary pillar core C1 by the mark G1, the center line of the width direction of the column is aligned with the secondary pillar core C2 by the mark G2, and the upper surface mold 35 is the secondary transfer member. 32
Weld to.

(E) In FIGS. 1 and 2, the upper end of the anchor bolt 40 is inserted through each insertion hole 36 of the upper template 35, and the upper nut 41 is inserted.
The anchor bolt 40 is suspended to a predetermined size.

When the suspension of the anchor bolt 40 is completed, the fixing plate 42 and the lower surface template 43 having the same shape as the upper surface template 35 are fixed to the lower end portion of the anchor bolt by the nut 49. The lower template 43 is provided with a steel rod 45 for steadying, and the anchor bolt 40 is steady by fixing the steel bar 45 to the vertical pile 30 by welding or the like. This completes the setting of the anchor bolt 40.

(F) After the anchor bolts 40 are set in the predetermined positions as described above, the reinforcing bars as shown in FIGS. 11 and 12, that is, the base bars 2, the column main bars 5, the beam bars 7, and the hoop bars 6 are arranged. The base concrete part formwork 11, the column formwork 12, the underground beam formwork 12a, etc. are assembled, the concrete is placed, the basic concrete is made, and the manjuu 19 is provided.

Then remove the formwork 11 and 12 and put the second around the foundation concrete.
Backfill to height E in the figure. At this time, the upper end of the foundation concrete is exposed on the ground.

(G) After backfilling, the pillar cores C1 and C2 are attached to the upper end surface of the basic concrete by black ink using the marks G1 and G2 on the transfer members 31 and 32.

(H) Upper surface mold plate 35 of FIG. 2, primary and secondary transfer members 31, 32
Is removed from the vertical pile 30 by gas cutting or the like, and at the time of erection, the lower end base plate 18 of the steel column 17 as shown in FIG. 11 is fastened to the upper end portion of the anchor bolt 40. At this time, the pillar steel frames 16 can be attached more accurately by using the marks of the pillar cores C1 and C2 marked on the surface of the basic concrete.

(Another embodiment) (1) In the illustrated embodiment, the primary transfer member 31 is arranged at right angles to the column direction, and the secondary transfer member 32 is arranged at right angles to the beam-to-beam direction. Secondary passing member at right angles to the direction
32 may be arranged at right angles to the column direction.

(2) The number of anchor bolts is not limited to four, and any number can be set according to the required strength.

(3) Primary transfer part 31, secondary transfer member 32 and upper surface template 35
May be fixed with bolts.

(Effects of the Invention) According to the present invention as described above: (1) Anchor bolts 40 before the reinforcement of the column main bars 5, beam bars 7, etc.
Since the setting is performed, the anchor bolt 40 can be easily and accurately set in a predetermined position and posture without being hindered by the respective reinforcing bars and without being bent or inclined.

(2) The marks G1 and G2 of the column cores C1 and C2 for positioning in the beam-to-beam direction H and girder row direction K are placed on the top of the vertical pile 30 instead of attaching the ground ink to the concrete as in the conventional method. Since it is attached to the transfer members 31 and 32 fixed to the above, it is easy to see the mark from above and it is easy to accurately mark it. Moreover, it is possible to easily and accurately perform centering of each pillar portion at the same time by the transit without using the lowering.

(3) Since the marks G1 and G2 of the pillar cores C1 and C2 are attached to the transfer members 31 and 32 fixed to the upper portion of the vertical pile 30, the steel pillars 18 are centered more than when mounted on the discarded concrete. It can be performed at almost the same height as the height, eliminating misalignment.

(4) Since the marks G1 and G2 of the pillar cores C1 and C2 are attached to the transfer members 31 and 32 fixed to the upper part of the vertical pile 30, as compared with the case where they are attached to abandoned concrete, scales, tapes, etc. can be used after reinforcement. The work to check the position of the anchor bolt is easy.

(5) Since the marks G1 and G2 of each pillar core C1 and C2 are attached to the transfer members 31 and 32 fixed to the upper part of the vertical pile 30, the marks will not disappear due to rain or groundwater, and even after backfilling. Since the mark can be stored, the pillar core can be easily and accurately marked on the upper surface of the foundation concrete.

(4) Since it is not necessary for the worker to lower or use a level on site, it is not necessary for the work to be skilled, and centering errors and the like on site are reduced, and the work is simple and accurate.

[Brief description of drawings]

FIG. 1 is a plan view of a setting device in a state where anchor bolts have been set according to the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3, FIG. 5, FIG. 7, FIG. The plan view which shows the process of the set construction method by this invention in order, FIG.
FIGS. 6, 8 and 10 are FIGS. 3, 5 and 5, respectively.
7 and 9 are front views, FIG. 11 is a vertical cross-sectional view of general foundation concrete, FIG. 12 is a XII-XII cross-sectional view of FIG. 11, and FIGS. 13 and 14 show conventional construction methods. FIG. 15 is a cross-sectional view when the anchor bolt is set, and FIG. 15 is a front view showing another conventional method. 30 …… Vertical pile, 31 …… Primary transfer member, 32 …… 2
Next-passing member, 35 ... Top template, 40 ... Anchor bolt,
43 …… Bottom template, 45 …… Steel bar

Claims (2)

[Claims] 1. A pair of vertical piles are fixed at four corners of each column installation place before the bar arrangement in a range wider than the cross section of the column form, and face each other in the girder direction or the beam direction with a space. 1
The secondary transfer member is fixed horizontally and at the same height on the upper part of the vertical pile, and the primary transfer member is marked with a primary pillar core extending in a direction intersecting with the primary transfer member. 1 transfer member
It is laid in the shape of a cross girder on the next passing member and fixed, the secondary passing member is marked with a secondary pillar core extending in the direction perpendicular to the primary pillar core, and the both pillar cores are arranged in the beam direction and girder direction. As a center of each of the above, for fixing the upper surface template on the secondary transfer member, suspending a plurality of anchor bolts on the upper surface template, and fixing the lower end portion of the anchor bolt to the steady rest, Anchor bolt setting method. 2. Vertical piles fixed to four corners of each place where columns are installed in a range larger than the cross section of the pillar formwork, and fixed vertically to the vertical piles at the same height and in the girder direction or beam direction. A pair of primary transfer members facing each other with a space between them and having a primary pillar core, and secondary pillars fixed to the primary transfer member in a cross beam shape in a direction perpendicular to the primary pillar core. A pair of secondary bridging members to which a core is attached, and an upper surface template for suspending anchor bolts fixed on the secondary bridging member with the pillar cores as the centers in the beam direction and column direction. An anchor bolt setting device for steel columns, which is characterized in that