JPS58112991A - Method of mounting strut to foundation in spherical tank - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of attaching a column supporting a spherical tank body to a foundation.

This kind of spherical tank has been getting larger in recent years due to social needs, and in line with this, its safety has increased! The level of importance is also higher than that of non-rich people.

In particular, sufficient seismic strength must be ensured in the event of an earthquake.

As shown in Fig. 1, in a spherical tank, the main body 1 is supported by a plurality of columns 2 extending vertically downward from its outer peripheral surface, and the columns 2 are fixed to a concrete foundation 3 installed on the installation surface. Installed.

In the support structure of such a spherical tank, when an earthquake occurs, a large horizontal shearing force acts on the joints between the pillars 2 and the concs IJ-) and 4[3. In order to withstand this shearing force, a conventional concrete foundation 3 was constructed as shown in Figure 2.
The pace plate 5, which was welded to the lower end of the support column 2, was fixed to the concrete foundation 3 using foundation bolts (anchor bolts) 4 embedded in the tank, but as the tank became larger, the shear force increased considerably. Therefore, it is not possible to obtain sufficient strength with conventional foundation bolts.

Therefore, the above-mentioned strength problem is solved by embedding the shear plate 6 attached to the pace plate 5 in the concrete base #3.

The following two methods are known for attaching columns to concrete foundations to which conventional shear plates are attached.

The first method is to first embed two foundation bolts 4 in the busy concrete foundation 3 as shown in Figure 3, and then adjust the level error from the installation surface of the foundation to the top surface of the concrete foundation 3 as shown in Figure 4. For this purpose, an appropriate number of adjusting plates (liners) 7 are placed one on top of the other. Next, as shown in FIG. 5, a pace plate 5 is welded and fixed to the lower end surface of the column 2, and a shear 7'lay 6 is welded and fixed to the pace plate 5, and the base plate 5 is placed on the concrete foundation 3. 5. The lower end surface of the base bolt 4 is brought into contact with and supported by the upper end surface of the adjustment plate T, and the upper end of the base bolt 4 is inserted into the base bolt hole 5a formed in the pace plate 5.
The pillar 2 is fixed to the concrete foundation 3 by inserting the nut 4A into the end of the foundation bolt 4 protruding from the bolt hole 5a and tightening it.

After assembling the struts 2 to the concrete foundation 3 as described above, the tank body 1 as shown in FIG. 1 is manufactured.

After this, as shown in FIG.
A grout 9 is constructed with mortar in the gap between the lower surface and the upper surface of the concrete foundation 3, and a shear plate 6, a part of the foundation bolt 4,
? Concrete foundation 3 with a structure that embeds J4 fairing plate T
Completely fixedly attach the support column 2 to the support column 2.

The above-mentioned grouting can be performed before the tank body 1 is filled with water, after the tank body 1 is filled with water, or after water is poured into the tank body 1. However, the above-mentioned method of attaching the struts according to FIGS. 3 to 6 has the following drawbacks.

(1) The amount of grout is very thick and cannot maintain the strength of the foundation against shearing force.

(2) The amount of adjustment plates is large (there are safety and accuracy problems when assembling the tank body to the support before grouting).

Next, in the second method, as shown in FIG. 7, foundation bolts 4 are embedded in the concrete foundation 3, and grooves 8 for embedding the shear grates 6 are formed on the upper surface of the concrete foundation 3. Next, as in the first method, an appropriate number of adjustment plates 7 are stacked and placed as shown in FIG. Assemble on concrete foundation 3. At this time, the shear plate 6 is inserted into the embedding groove 8.

After assembling the tank body 1 on the support 2, as shown in FIG. 10, grouting is performed between the lower surface of the support 2 and the upper surface of the concrete foundation 3 (9), and the support 2 is completely fixed and attached on the concrete foundation 3.

The strut mounting method shown in FIGS. 7 to 10 described above has the following drawbacks.

(1) During grouting, it is difficult to completely inject mortar because the groove for embedding the shear plate is small.

(2) When grouting is performed during or after filling with water, the load of the tank body will be applied to the concrete foundation 3 only by the adjusting plate portion of approximately 50 x 100 [j], which may result in damage to the concrete foundation. I end up.

Therefore, in view of the above-mentioned conventional circumstances, the present invention abolishes the conventional pillar mounting method and instead embeds a shear plate when embedding the foundation bolts in the foundation. To provide a method for attaching a support to a foundation in a spherical tank, which eliminates all of the above-mentioned conventional drawbacks by assembling a pace plate to a shear plate and then assembling a support to the pace plate.

The following description will be made based on FIGS. 11 to 15, which are simple examples of the present invention.

First, in Fig. 11, the appropriate number of concrete foundations 13 (
In this embodiment, two foundation bolts 14 are embedded, and at the same time, an appropriate number (four in this embodiment) of anchor holes 16 are embedded, and the upper ends of each are made to protrude from the upper surface of the concrete foundation 13. Next, as shown in Fig. 12, on the top surface of the concrete foundation 13.

In order to adjust the level error from the installation surface of the foundation, an appropriate number of adjustment plates 17 are placed one on top of the other.

Then, a base plate 15 as shown in FIG. 13 is prepared.

As shown in the figure, this base grate 15 has a foundation bolt hole 15A through which the foundation bolt 14 can be inserted.

A shear plate mounting hole I into which the shear plate 16 can be inserted when the foundation bolt 14 is inserted into the bolt hole 15A.
This base plate 15 is placed on the concrete foundation 13 as shown in FIG.
#The lower end surface of the base plate 15 is brought into contact with and supported by the upper end surface of the adjustment plate 11, and the upper end portion of the foundation bolt 14 is inserted into the bolt hole 15A, and the upper end portion of the shear plate 16 is inserted into the shear plate mounting hole ISB.

After checking that the horizontality and level of the base plate 15 are appropriate in the arrangement state of the pace plate 15, the upper end of the shear plate 16 and the inner circumference of the shear plate mounting hole 15B of the base plate 15 are The base plate 15 is fixed to the concrete foundation 13 by welding 20 to fix them together, and by screwing and tightening nuts 14A into the protruding ends of the bolt holes 15A of the foundation bolts 14, as shown in FIG.

Thereafter, as shown in FIG. 15, the lower end surface of the column 12 is abutted and supported on the upper surface of the base plate 15, and the lower end of the column 12 is fixedly attached to the upper surface of the base plate 15 by welding 21.

After the pillars 12 are assembled to the concrete foundation 13 as described above, the tank body 1 as shown in FIG. 1 is assembled.

Then, as shown in FIG. 15, grout 19 similar to the conventional method is applied to the gap between the lower surface of the pace plate 15 and the upper surface of the concrete foundation 13, and a part of the shear plate 16 and the foundation bolts 14 are applied to the grouted area. A part of the shaft and the adjusting plate 17 are embedded in the concrete foundation 13, and the support pillar 12 is completely fixed and attached to the concrete foundation 13 with the pillar 12 supported.

According to the strut mounting method described above, there are the following advantages.

(1) Since the shear plate 16 is not attached to the support column 12 and a part of the shear plate 16 is embedded in the concrete foundation 13 in advance, the portion where the shear plate 16 is embedded in the grouting area can be reduced. In other words, since there are only a few grouted parts, the strength against the shear force of the foundation due to the concrete foundation 13 and the grouted parts can be maintained at a certain level.

In addition, the gap between the bottom surface of the base plate 15 and the top surface of the concrete foundation 13 is small, and the number of adjusting plates 17 interposed in this gap is small, which improves safety and accuracy when assembling the tank body before grouting. No problems occur.

(2) When performing grouting, conventionally it was difficult to inject mortar into the small embedding groove 8 of the shear plate 6, but since the shear plate 16 is configured to be embedded in the concrete foundation 13 in advance, According to this method, the trench for embedding is not required, and there is no difficulty in pouring mortar.

(3) When grouting is performed during or after filling the tank body 1 with water, conventionally, the load of the tank body 1 is applied to the concrete foundation 3 only by the adjusting plate 70, thereby preventing the concrete foundation 3 from being damaged. However, according to this method, the base plate 15 is welded and fixed to the shear plate 16 embedded in the concrete foundation 13, so the load of the tank body 1 is also applied to the concrete foundation 13 by the pace plate 15. Therefore, there is no risk that the concrete foundation 13 will be damaged.

In the above embodiment, as shown in FIG.
/ 16 Although the upper end m and the inner peripheral part of the shear grate mounting hole 15B of the base plate 15 are fixed by welding, the present invention is not limited to this, and when the shear grate 16 and the pace plate 15 are welded and identified, the pace plate 15
Shear plate 16 may protrude from the mounting hole 15B. In this case, when the lower end surface of the support column 12 is welded and fixed to the upper surface of the base plate 15 later, the protruding end portion of the shear plate 16 that gets in the way can be removed.

Further, the support column 12 attached to the base plate 15 is attached to the first
It is not necessary that the strut be a completed strut as shown in the figure; it is a good idea to attach only the lower end of the strut and then complete the strut one by one.

One advantage of the above explanation is that according to the method of attaching a support to the foundation of a spherical tank according to the present invention, when embedding the foundation bolts in the foundation, the shear plate is also embedded. By assembling the support columns to the base plate, it is possible to reduce the amount of grout to be applied between the base plate and the foundation, and to reduce the amount of foundation level error adjustment plates interposed between the base plate and the foundation. It is possible to improve the strength against the shear force of the tank body, and also to improve the safety and accuracy in assembling the tank body to the support column. In addition, grout can be completely injected between the pace grate and the foundation, and when performing grouting, the load of the tank body can be applied to the foundation at the shear plate, so there is no damage to the foundation. There are advantages such as being able to prevent damage, and the use of a strut mounting method using shear plates makes it possible to achieve the purpose of earthquake resistance that accompanies the increase in the size of spherical tanks.

[Brief Description of the Drawings] Fig. 1 is a front view showing the structure of a spherical tank that is the subject of the present invention, Fig. 2 is an fWT side view showing a general column mounting structure using a shear grate, and Fig. 3 - Figures 10 are diagrams showing the steps of the conventional pillar installation method, respectively, and Figures 3 and 4 (B
), Figure 5, Figure 6, Figure 7 (B), Figure 8 (B),
Figures 9 and 10 are longitudinal sectional views, respectively, and Figures 4, 7, and 8 are plan views. 11, 12, 14, and 15 are diagrams showing the steps of the strut installation method of the present invention, respectively. 1... Spherical tank body 12... Support 13... Concrete foundation 14... Foundation bolt 15... Base plate 16... Shear plate patent applicant Niigata Iron Works Co., Ltd. Agent Patent attorney Sasa Tomiji Shima 8th figure (A) 11th [Hagi (A) 12th figure (A) ・-14,. :+7'Σ13 (A) 151・<F

Claims (1)

[Claims] When attaching a column supporting the spherical tank body to a foundation installed on an installation surface, after embedding a foundation bolt and a shear plate in the upper end of the foundation, an insertion hole for the foundation bolt and an insertion hole for the shear plate are provided. A method for attaching a support to a foundation in a spherical tank, characterized in that a pace plate is assembled to the upper end of the foundation and fixed by welding to the shear plate, and the support support is attached to the upper surface of the pace plate by welding.