JP3848997B2 - BASE MEMBER FOR INSTALLING STEEL, MANUFACTURING METHOD THEREOF, AND METHOD FOR INSTALLING STEEL USING BASE MEMBER FOR STEEL INSTALLATION - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a base member for installing a steel frame used when installing a steel frame on basic concrete, a manufacturing method thereof, and a method of installing a steel frame using the base member for installing a steel frame.
[0002]
[Prior art]
Conventionally, when attaching a steel frame used for a building to foundation concrete, a mortar is formed on the foundation concrete, and the steel frame is installed on the mortar. This is because the mortar strengthens the bond between the steel frame and the foundation concrete.
[0003]
In the concrete foundation, a plurality of anchor bolts (usually four) are embedded at positions designed in advance. A mortar is formed at a position inside the anchor bolts, and a steel base is placed on the mortar. The mounted steel frame is fixed to an anchor bolt at its base.
Aside from the above, a method of filling mortar after placing a steel frame is disclosed in, for example, Japanese Patent Application Laid-Open No. 2001-59226, “Level Setter for Foundation Concrete and Column Installation Method for Foundation Concrete”. According to the present invention, a level setter fixed to an anchor bolt is prepared, and then the upper surface of the foundation concrete is driven up to the level of the level setter, and the steel frame is adjusted so that the steel frame becomes a predetermined height on the basis of this level setter. And then filling the space between the foundation concrete and the steel frame with mortar.
[0004]
[Problems to be solved by the invention]
A common problem in the above-described prior art is the poor accuracy of the flatness of the mortar surface. The above cited example uses a level setter to solve this problem, so that the steel frame can be accurately set to a certain reference height, but instead, a new member called a level setter is not required. Don't be.
[0005]
On the other hand, when a mortar is formed on basic concrete and a steel frame is installed thereon without using such a level setter, the mortar is mainly formed manually as described above. It does not necessarily meet the desired requirements. For this reason, the mortar surface must be flattened when there is a possibility of greatly affecting the assembly accuracy of the steel frame.
[0006]
Furthermore, in any of the above conventional examples, in the case of rain, mortar cannot be filled between the basic concrete and the steel frame, and mortar with poor flatness cannot be processed, and the work period is long. In some cases, it may be difficult to reduce costs by increasing the length.
[0007]
Therefore, an object of the present invention is to provide a steel frame installation base member that can solve the above-mentioned problems and can perform the installation of a steel frame with high accuracy, a manufacturing method thereof, and a steel frame installation method using the steel frame installation base.
[0008]
Furthermore, an object of the present invention is to provide a steel installation base member that is relatively low-cost and less susceptible to the weather without prolonging the construction period for steel installation, a manufacturing method thereof, and a steel frame using the steel installation base It is to provide an installation method.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the steel frame installation base member of the present invention is a support formed on basic concrete (preferably mortar, but may also be a non-shrinkable material). A non-shrinkable substance used between a steel frame placed on a support and molded into a predetermined shape.
[0010]
Preferably, the non-shrinkable material is a cement-based non-shrink grout material. Preferably, the first main surface of the base member is in contact with the steel frame, the second main surface opposite to the first main surface is in contact with the support, and the second main surface is roughened. May be.
[0011]
Preferably, the base member has a cylindrical shape, and the first main surface is formed with at least one center line passing through substantially the center thereof, and the center line is used for positioning the base member.
[0012]
Preferably, the center line is a groove formed in the first main surface, and the two center lines are perpendicular to each other. Preferably, the base member can include a wire mesh inside.
[0013]
The method for producing a base member for installing a steel frame of the present invention is to prepare a non-shrinkable substance, liquefy the substance, fill it into a stainless steel container, and then solidify it. The surface of the base member that contacts the steel frame is formed by the bottom surface of the container. Further, a linear protrusion may be formed on the bottom of the stainless steel container, and a center line may be formed on the surface of the base member by the protrusion.
[0014]
Furthermore, in the steel frame installation method of the present invention, a support (preferably a mortar, but may be a material of a non-shrinkable material) on foundation concrete on which a plurality of anchor bolts are arranged. The non-shrinkable base member formed and formed in advance on the support is placed, the steel frame is placed on the base member, and the base of the steel frame is fixed to the anchor bolt.
[0015]
Preferably, the method includes positioning the non-shrinkable base member with respect to the plurality of anchor bolts.
[0016]
According to the present invention, since the base member for installing the steel frame is previously molded from a non-shrinkable substance, the surface accuracy of the base member can be improved by several steps compared to the conventional manual operation. Furthermore, even in the case of rain or the like, if a base member molded in advance is used, it is not necessary to perform mortar filling or flattening, so that the construction period is not prolonged.
[0017]
Furthermore, by roughening the second main surface of the base member, it is possible to improve the biting between the base member and the mortar, and at the same time, the poor flatness of the mortar surface can be absorbed to some extent by the base member. Is possible.
[0018]
Furthermore, by providing a center line on the first main surface of the base member, the base member can be positioned at an appropriate position with reference to a predetermined position of an anchor bolt or the like.
[0019]
Furthermore, it is possible to improve the strength of the base member by providing a wire mesh in the base member.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below. In the present embodiment, a precast base (hereinafter referred to as a PC base) is used as a steel frame installation base member. In the PC base, a cement-based non-shrinkable grout material is used as a non-shrinkable cement material. The grout material is preferably, for example, U-grout (trade name) manufactured by Ube Industries, Ltd. Other than this, for example, Non Shrink (trade name) manufactured by ABC Corporation, Asano Five Star Grout 100 (trade name) manufactured by Asano Co., Ltd. Denkatascon (trade name) manufactured by Denki Kagaku Kogyo Co., Ltd. There are Preodax (trade name) manufactured by Onoda, and these can also be used. In general, the characteristics of a grout material are that it contains a calcium oxide-based expansion material, so there is almost no shrinkage during drying, and it has high strength, high adhesion, and high fluidity.
[0021]
FIG. 1 is a perspective view showing a stainless steel container for producing a PC base. The container 1 provides a cylindrical inner space, and its inner wall surface is configured to be flat with high accuracy. An inverted V-shaped projection 2 is formed on the bottom surface of the container 1 so as to be orthogonal to the cross, so that a groove-shaped center line can be formed on the surface of the PC base.
[0022]
Prior to the introduction of the grout material, it is desirable to perform a cleaning process so that there is no deposit such as dust in the container 1. This is because the inner wall surface of the container, particularly the bottom surface, forms a flat surface of the PC base. Moreover, it is preferable to apply a release material to the inner wall of the container 1. This is so that the molded grout material can be easily taken out from the container.
[0023]
When the above pretreatment is completed, a specified amount of water is liquefied while gradually adding a grout material prepared in advance into the container 1, and agitation is appropriately started. The grout material dries and solidifies after a certain time. For this reason, before the grout material is solidified, the exposed surface of the container 1 is roughened into a lattice shape using a comb member.
[0024]
Alternatively, a metal mesh may be loaded into the container 1 and filled with a grout material. By adding a wire mesh, the grout material is molded very firmly and the strength of the PC base can be improved. When the PC base is transported to the steel frame installation site or when the PC base is loaded, it is effective to have high strength.
[0025]
FIG. 2 is a plan view of the molded PC base, and FIG. 3 is a side view thereof. A V-shaped groove corresponding to the protrusion 2 of the container 1 is formed on one surface of the PC base 3. The V-shaped groove functions as a positioning center line 4 when the PC base is installed. The upper surface of the PC base is a surface formed in contact with the lower surface of the container 1, and the flatness thereof is extremely high. This is because the grout material has high adhesiveness and high fluidity so that it can be in very good contact with the lower surface of the container 1, and since there is almost no shrinkage after drying, the PC base according to the inner diameter of the container 1 is used. Can be molded.
[0026]
The PC base 3 according to the present embodiment has a diameter of 300 millimeters and a thickness of 15 millimeters. However, the present inventor considered that the PC has a diameter in the range of 50 millimeters to 450 millimeters and a thickness in the range of 13 millimeters to 18 millimeters. The base has been manufactured and confirmed to be applicable to the installation of steel frames in these ranges. Of course, it goes without saying that the present invention can be applied on a PC base exceeding these ranges.
[0027]
FIG. 4 is a cross-sectional view of the main part when constructing a steel frame using the PC base according to the present embodiment, and FIG. 5 is a plan view of FIG. Four anchor bolts 6 are embedded in the foundation concrete 5 corresponding to the place where the steel frame is to be installed. Next, the mortar is placed so that the mortar 7 is positioned substantially at the center of each anchor bolt 6. The height of the mortar 7 is set to a thickness of about 35 to 55 millimeters in consideration of the height of the PC base 3 to be placed thereon. In this state, the surface of the mortar 7 is uneven and does not necessarily have good flatness. In the present embodiment, the mortar 7 is used as a support for supporting the PC base, but the mortar is not necessarily limited. For example, the support may be formed using a non-shrinkable cement material.
[0028]
Next, the PC base 3 molded by the method of FIGS. 1 and 2 is placed on the mortar 7. Since the lower surface of the PC base 3 is roughened to increase its surface area, the adhesiveness with the upper surface of the mortar 7 is improved. At the same time, the roughness of the top surface of the mortar 7 is also absorbed by the coarseness of the PC base 3. On the other hand, the upper surface of the PC base 3 is finished to a surface having a very flat accuracy.
[0029]
Along with the placement of the PC base 3, the PC base 3 is positioned, that is, centered, using the center line 4 formed on the upper surface thereof. This is performed, for example, by adjusting so that the center line 4 comes to the center of the adjacent anchor bolt 6. If the PC base is not placed at an appropriate position on the mortar 7, extreme stress is concentrated on the PC base when the steel frame is installed, which may cause damage to the PC base or mortar and assembly accuracy of the steel frame. .
[0030]
Here, an example in which positioning is performed using anchor bolts has been described, but other than this, for example, the center line may be aligned with a cross-shaped ink which is provided in advance around the mortar 7.
[0031]
When the attachment of the PC base 3 is completed, the steel frame 8 is installed on the PC base as shown in FIG. The base portion 9 of the steel frame 8 is wider than the column portion, and a hole through which the anchor bolt 6 passes is formed. The anchor bolt 6 passing through the base 9 is fastened to the nut 10.
[0032]
Since the base portion 9 of the steel frame 8 is installed on the PC base 3 having a very high degree of flatness, the accuracy of the steel frame 8 is very high, which is very important for the steel frame forming the framework of the building. .
[0033]
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and various modifications and changes can be made within the scope of the present invention described in the claims. It can be changed.
[0034]
【The invention's effect】
As is clear from the above detailed description, according to the present invention, since the base member disposed between the steel frame and the mortar is molded in advance, the flatness of the surface of the base member can be accurately formed. Assembling accuracy of the steel frame placed thereon can also be improved. Also, even in the case of rain, the base member is molded in advance, so it can be placed on the mortar to perform the steel frame installation work, thereby shortening the construction period and consequently In addition, a reduction in construction costs can be expected.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a stainless steel container for producing a PC base.
FIG. 2 is a plan view of a molded PC base.
FIG. 3 is a side view of FIG. 2;
FIG. 4 is a cross-sectional view of a main part when a steel frame is installed using the PC base of the present embodiment.
FIG. 5 is a plan view of FIG. 4;
FIG. 6 is a cross-sectional view of a main part showing a state where a steel frame is installed on the PC base of the present embodiment.
[Explanation of symbols]
1: container 2: protrusion 3: PC base 4: center line 5: foundation concrete 6: anchor bolt 7: mortar 8: steel frame 9: base 10: nut

Claims (6)

A support is formed on the foundation concrete on which a plurality of anchor bolts are arranged, a base member is placed on the support, a steel frame is placed on the base member, and the base of the steel frame is attached to the anchor bolt Including the step of fixing,
  Between the steel frame and the foundation concrete, the base member and the support are interposed inside the plurality of anchor bolts,
  The base member is formed by molding a cement-based non-shrinkable grout material into a predetermined shape, and a first main surface of the base member is in contact with the steel frame and is opposed to the first main surface. The second main surface is in contact with the support, and the second main surface is roughened. Installation of steel according to claim 1 including the step of positioning the base member to the plurality of anchor bolts. The base member has a cylindrical shape, and at least one center line passing through a substantially center thereof is formed on the first main surface, and the center line is used for positioning the base member. The installation method of the steel frame of Claim 1 or 2 . The steel frame installation method according to claim 3 , wherein there are two center lines and are orthogonal to each other. The steel frame installation method according to any one of claims 1 to 4 , wherein the base member includes a wire net therein. 6. The method for installing a steel frame according to claim 1 , wherein the support is mortar or a non-shrink material.

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