JPH0215712B2 - - Google Patents

Description

[Detailed Description of the Invention] Since it is difficult in construction to finish the concrete surface in contact with the base plate of a steel column, which is the standard for constructing a steel column, at once to be horizontal and smooth, conventionally, the position of the concrete top surface was The method used is to pour concrete down about 25mm to 50mm, sufficiently roughen the top surface of the foundation concrete, and then apply mortar to a specified height to make the top surface level and smooth. This is generally called base mortar, and there are two methods for doing so: (1) full-surface coating and (2) backfill center coating. In other words, (1) the full-surface coating finishing method involves applying mortar over the entire surface of the poured foundation concrete as shown in Figure 11, finishing the surface of the mortar to be horizontal and smooth, and then applying the mortar to the base plate of the steel column. A method of fitting the through holes to the anchor bolts, placing the base plate on the mortar plate, and tightening and fixing the base plate on the mortar plate using the nuts screwed into the screws of the anchor bolts.

(2) As shown in Fig. 12, in the post-filling center coating method, a circular mortar mange (commonly known as a mortar mange) is placed at an appropriate height on top of the poured foundation concrete, and the base plate of the steel column is filled through the base plate. After fitting the holes to the anchor bolts and placing the base plate on top of the mortar grooves, rebuild the steel column using the mortar grooves as a fulcrum, and screw the anchor bolts into the screws. Tighten the nuts to the base plate and fix the base plate to the anchor bolts.
After that, although not shown, mortar is packed into the space between the base plate A and the foundation concrete below the periphery.

It is.

By the way, in the method (1) above, when a steel column is erected, it is difficult to re-erect it, so high precision is required for horizontal and smooth finishing of the upper surface of the mortar. Therefore, sufficient construction management is required, but it is nearly impossible to finish the top surfaces of all mortar roofs at the same level. On the other hand, in method (2) above, the lower part of the periphery of the base plate of the steel column is not finished with mortar and is open, so it is convenient that the steel column can be easily rebuilt. .
However, because the mortar part is small and unstable,
When a steel column is being reerected, the load of the steel column is concentrated at the end of the mortar ridge, and the end of the mortar ridge collapses due to the load, causing the mortar ridge to break. There is a risk of the steel column falling over.

As mentioned above, mortar is mainly used for the base of steel columns because mortar has high compressive strength, is easy to handle, and can be constructed at low cost. However, both of the conventional methods (1) and (2) above have the disadvantage that the work to achieve the most important level requires a large amount of effort and that the work is dependent on the skill of the worker.

Therefore, in the present invention, a horizontal plate is installed horizontally on the foundation concrete, and on the horizontal plate,
Place a level ring made by screwing together two rings, rotate one ring of the level ring to easily adjust the level of the top position of the level ring, and after adjusting the level, place the ring inside the level ring. The above-mentioned drawbacks of the base mortar are improved by filling mortar, leveling the top surface of the mortar so that it matches the top of the level ring, and placing the base plate of the steel column on top of the level ring. The present invention relates to a method for leveling the base plate of a steel column and its leveling hardware.

To explain the structure of one embodiment of the present invention shown in FIGS. 1 to 10, a is a leveling ring of a leveling hardware, which is composed of a male threaded ring 1 and a female threaded ring 2 made by threading a steel pipe. , the male threaded ring 1 is screwed into the female threaded ring 2, and the upper edge of the male threaded ring 1 is provided with a flange 3 and made thick to prevent it from breaking due to the load of the steel column, and a level ring a is formed. Configure. Reference numeral 4 denotes a horizontal plate, in which a U-shaped cut is made on both sides of a horizontal rectangular iron plate with the open part facing inward, and the part inside the cut is bent upward from the inner end of the cut to install a support piece 5. The horizontal plate 4 is manufactured by fitting the lower ends of the level rings a into the supporting pieces 5 on both sides, and by drilling several mortar holes 6 in the center of the iron plate.

7 is the poured foundation concrete, 8 is the anchor bolt buried in the foundation concrete 7, 9
is a nut screwed into the thread of anchor bolt 8, 1
0 is mortar placed on foundation concrete 7, 1
1 is mortar filled in level ring a, 12
13 is the base plate of the steel column, and 13 is the base mortar made using the full coating finishing method.

Next, I will explain how to level it up.

(i) As shown in FIG. 6, place an appropriate amount of mortar 10 on the foundation concrete 7 at approximately the center position inside several anchor bolts 8.

(ii) Next, as shown in FIG. 7, the horizontal plate 4 is placed on the mortar 10, and a spirit level or the like is placed on the horizontal plate 4 to horizontally install the horizontal plate 4.

At this time, the mortar 10 enters and solidifies into several mortar holes 6 of the horizontal plate 4, and the horizontal plate 4 is fixed on the foundation concrete 7.

(iii) Next, as shown in FIG.
After placing it upright, rotate the male threaded ring 1 located above it to one side or the other as appropriate, raise or lower the male threaded ring 1 by screwing it with the female threaded ring 2, and expand and contract the level ring a, If the level of the top end of the level ring a is adjusted and the top end is placed at a predetermined position, the top end becomes horizontal at a predetermined height.

At this time, due to the contact between the support pieces 5 on both sides of the horizontal plate 4 and the lower end of the level ring a, the level ring a does not move or its female thread ring 2 rotates together, preventing the level ring a from rotating idly. By rotating the ring 1, the level adjustment operation of the top position of the level ring a can be easily performed.

(iv) Next, as shown in Figure 9, level ring a
Fill the inside with mortar 11, and the mortar 11
Level the top surface with a trowel and align it with the top of level ring a.

At that time, the mortars 10 and 11 are connected to each other through the mortar through holes 6 of the horizontal plate 4.

(1) Postfill center coating method.

In the backfill center coating method, the above (iv)
After completing the construction process, as shown in FIG.
is placed on the level ring a and the mortar 11, and then the steel column is reerected using the level ring a as a fulcrum, and the nut 9 screwed into the thread of the anchor bolt 8 is tightened to the base plate 12 to remove the base plate 1.
2 to the anchor bolts 8, and then, although not shown, mortar is filled in the space between the base plate 12 and the foundation concrete 7 below the periphery, completing the erection of the steel frame column.

(2) In the entire surface painting method, after the step (iv) above, as shown in Figure 10, the base plate 1 is
A base mortar 13 is prepared according to the size of the base mortar 13 whose upper surface is made horizontal and smooth by matching the top end of the level ring a with mortar. After that, the anchor bolts 8 are fitted into the through holes of the base plate 12 of the steel column, and the base plate 12 is placed on the base mortar 13.
Nut 9 screwed into the thread of anchor bolt 8
By tightening and fixing the base plate 12 onto the base mortar 13, the erection of the steel column is completed.

Note that the flange 3 of the male threaded ring 1 of the level ring a does not necessarily need to be provided.

The level ring a works in the same way even if it is used upside down.

A concave groove for rotating operation in the radial direction may be provided at the top or bottom end of the level ring a, or both ends thereof, or an insertion hole for a rotation control rod may be provided at the top or bottom end of the level ring a, or at both upper and lower ends. ,
Alternatively, if a protrusion for rotational operation is installed, the operating rod can be engaged with the groove or inserted into the insertion hole to operate the male threaded ring 1 or the female threaded ring 2.
The level adjustment operation of the top end position of the level ring a can be easily performed by rotating the male threaded ring 1 or the female threaded ring 2 by rotating the protrusion or pushing the protrusion by hand.

Instead of the screws on the male threaded ring 1 and the female threaded ring 2 of the level ring a, several protrusions that are inclined with respect to the axis are installed at appropriate intervals on the opposing surfaces of both rings, and these protrusions are connected to each other. , or 1
One ring is provided with several guide slots that are inclined with respect to the axis, and several protrusions installed on the other ring are fitted into the guide slots. by rotating it towards one side or the other.
Even if the level ring is configured such that one of the rings rises or falls in parallel, the same effect as described above will occur.

The male threaded ring 1 and the female threaded ring 2 of the level ring a may be made of other metals, hard synthetic resins, or the like instead of the steel pipes described above.

In the present invention, the base plate of the steel column is leveled as described above, so by using the horizontal plate, the spirit level etc. can be surely placed on the horizontal plate, so it is not only easy to level the horizontal plate, but also The plate can be quickly and accurately installed horizontally, and the top end of the level ring placed on the horizontal plate is also ensured to be horizontal.

Furthermore, if a level ring is placed on a horizontal plate and one of the rings is rotated in one direction or the other, the ring will rise or fall and the top of the level ring will lower, so that the erection position of all steel columns can be adjusted. The tops of all level rings can be properly aligned on the same horizontal plane by appropriately operating the level rings in the table to adjust the level of their top positions, making this operation extremely easy, quick and easy. Not only can all steel columns be erected at the same height by smoothly and finely adjusting the level, but the horizontal plate only needs to be level, and the level ring can only adjust the height, making it possible to adjust the levelness and height. Since they are separated, they are easy to operate and can be adjusted reliably.

Furthermore, since the horizontal plate and level ring are partial, centering can be done easily and safely. Anyone can easily level the edges, and even an amateur can align the top surface of the mortar with the top of the level ring to make it level and smooth. The level ring firmly supports the base plate of the steel column, and the mortar corner does not collapse or the mortar part breaks due to the load of the steel column, unlike conventional mortar bundling. It is possible to prevent steel columns from falling over, safely and securely rebuild steel columns, and to precisely erect all steel columns vertically at a constant height.

On the other hand, in the case of the entire surface coating method, after adjusting the level at the top of the level ring and filling it with mortar in the same way as above, the size of the base plate of the steel column is determined based on the top of the level ring. When the top surface of the base mortar is leveled and smoothed by matching the top of the level ring with mortar, the top surface of the base mortar at the erection position of all steel columns will be properly aligned and level on the same horizontal plane. Since it can be formed, if the base plate of the steel column is then placed on the base mortar and installed, all the steel columns can be erected vertically at a certain height, and therefore, it becomes the standard for erecting the steel column. This has the effect of making it easier to apply the base mortar.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view of a leveling ring of a leveling hardware according to one embodiment of the present invention used for leveling a base plate of a steel column, Fig. 2 is a plan view of the same, and Fig. 3 is a front sectional view of a horizontal plate. , Fig. 4 is a plan view, Fig. 5 is an exploded slope view of the same leveling hardware, Figs. Figure 7 shows the state with the mortar placed, Figure 7 shows the state with the horizontal plate installed, Figure 8 shows the state with the level ring placed on the horizontal plate, and Figure 9 shows the inside after adjusting the level at the top of the level ring. Fig. 10 shows a state in which a base mortar is prepared using the mortar. 1st
1 and 12 are front cross-sectional views for explaining conventional leveling work, FIG. 11 shows the state in the entire surface coating finishing method, and FIG. 12 shows the state in the backfilling center coating method, respectively. a... Level ring, 1, 2... Ring, 4...
...Horizontal plate, 7...Foundation concrete, 1
0,11...Mortar, 12...Base plate.

Claims (1)

[Claims] 1. Mortar is placed on the foundation concrete, a horizontal plate is installed horizontally, and a level ring consisting of two rings screwed together is placed on the horizontal plate, one of which is placed vertically. After adjusting the level of the top position by rotating the ring appropriately and expanding and contracting the level ring, fill the level ring with mortar and level the top surface of the mortar so that it matches the top of the level ring. A method for leveling a base plate of a steel column, characterized in that the base plate of the steel column is leveled and the base plate of the steel column is placed on the leveling ring. 2. A horizontal plate with support pieces installed on both sides and a mortar hole in the center, and installed horizontally on the foundation concrete, and two rings fitted with screws to form a horizontal plate on both sides of the horizontal plate. Fit the lower end to the support piece and place it upright on the horizontal plate,
The hardware for leveling a base plate of a steel frame column is characterized by comprising a leveling ring on the top end of which the base plate of the steel frame column is placed.