JPH06322980A - Form for concrete for column, and construction thereof - Google Patents

Abstract

PURPOSE:To easily ensure accuracy for a form and to facilitate erection and dismantlement of the form by a method wherein stiffening frames are arranged to the sides of the form, and the frames are connected with fixing pins, according to the dimensions of a column in frame structure. CONSTITUTION:A plurality of metal fittings 3 fixed to a foundation concrete floor 1 determine installation positions for the lower ends of vertical stiffeners 5. The vertical stiffeners 5 and horizontal stiffeners 15 stiffen the sides of a steel form 4 in its lengthwise and breadthwise directions. Connecting pins 20 are inserted, according to the dimensions of the form 4, into position adjusting holes 15a provided to both ends of adjoining horizontal stiffeners 15 that are overlapped each other, and the adjoining horizontal stiffeners 15 are connected together. The stiffeners 15 are formed in specified dimensions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork apparatus for columns of reinforced concrete and steel reinforced concrete structures for construction and civil engineering structures, and a method for constructing the same.

[0002]

2. Description of the Related Art A conventional formwork apparatus processes plywood, which is a formwork surface material, on site, and when constructing a formwork, a large number of temporary materials such as tightening metal fittings such as separators and stiffening materials for stiffening. Was using. Therefore, there has been a problem that assembly and disassembly work are very complicated and complicated. As measures for solving such a problem, for example, a plywood frame is formed into a panel, or a large conical seat is used as a stiffening material as disclosed in Japanese Patent Laid-Open No. 53-120818. It has been devised to reduce the use of the and improve work efficiency.

[0003]

However, in any of the above inventions, in order to prevent deformation of the mold due to concrete pouring pressure and other external forces, the inside of the mold in which the reinforcing bars are assembled is generally The work of passing the separator was left. In addition, when restraining the face material with a thick material for stiffening,
Tightening work must be done carefully in order to prevent deformation of the formwork when placing concrete due to insufficient tightening and deformation of the formwork due to overtightening, but there is no clear standard for tightening, so the worker's sense It was difficult to keep the precision of the formwork constant all the time because it had to rely on In addition, since skilled workers tend to decrease in the future, some measures have been awaited.

Further, as a rational measure for the formwork assembling work, a method of forming a formwork surface material in a cylindrical body and building it up has been devised as one of the most effective methods. Since a separator cannot be passed through when constructing a frame, it is necessary to secure the dimensional accuracy of the formwork during concrete placement by constraining the face material with a thickening material for stiffening. However, in this case, since there is no separator, it is difficult to position the thick end material, and there is a problem that the dimensional accuracy is lowered due to insufficient tightening or over tightening.

The present invention has been made in order to solve the above problems, and it is possible to obtain the precision of the mold extremely easily without using a separator, and to maintain this precision, and to assemble it. -The purpose is to obtain a concrete formwork device for columns that can be easily disassembled and a method for constructing it.

[0006]

A concrete formwork apparatus for pillars according to the present invention is a rectangular cylindrical formwork that is erected at a predetermined position on a foundation concrete floor, and is arranged at each corner of the formwork, A plurality of foundation fittings fixed on the foundation concrete floor, each standing on the outside of each side of the formwork,
A longitudinal stiffener having a lower end attached to each of the base metal fittings and a plurality of notches recessed from the mold side at a plurality of longitudinal positions, and notches of the longitudinal stiffener Both ends are fitted to the part, the both ends extend outward from the width of each surface of the mold, and lateral stiffening members having position adjusting holes at predetermined positions on both ends in the longitudinal direction, The lateral stiffening member is provided with a connecting pin that penetrates the position adjusting hole at each of the overlapping corner portions to join the lateral stiffening member.

Further, the method for constructing a concrete formwork apparatus for a pillar according to the present invention comprises a step of fixing a base metal fitting to each corner of the formwork at a position where the formwork is to be erected on the basic concrete floor, and a step of fixing the base metal fitting. Formwork installation process of installing a rectangular cylindrical formwork at the planned standing position, and two columnar vertical stiffeners with notches formed at multiple vertical positions separated by a predetermined distance, In the cut portion of each longitudinal stiffener, both ends thereof extend outward from the width of each surface of the mold, and both end portions in the longitudinal direction have position adjusting holes in the lateral direction. A stiffening frame forming step of forming a stiffening frame by installing stiffening materials, and a plurality of stiffening frames formed in the stiffening frame forming step are provided on the outer surface of the mold in each longitudinal stiffening direction. A stiffening frame that is installed by attaching the lower end of the material to the base metal fittings. Step, and connecting the lateral stiffeners by inserting the connecting pin through the position adjusting holes at both ends of the lateral stiffeners of each stiffening frame installed by the stiffening frame installation step And a lateral stiffener joining step.

[0008]

[Operation] A plurality of foundation fittings fixed on the foundation concrete floor determine the installation position of the lower end of the longitudinal stiffener. The vertical stiffeners and the lateral stiffeners stiffen the side surfaces of the formwork from the vertical and horizontal directions. By connecting the connecting laterally stiffening materials according to the size of the form into the position adjusting holes provided at both ends of the laterally stiffening materials next to each other that overlap, Set to the specified dimensions.

[0009]

1 is a front view of a pillar formwork apparatus according to the present invention,
FIG. 2 is a plan view of FIG. In the figure, 1 is a foundation concrete floor on which concrete columns are placed, and 3 is a foundation metal fitting that is fixed to the foundation concrete floor 1 and that installs legs of a stiffening frame, which will be described later, at predetermined positions. As shown in FIG. 3, the base metal fitting 3 has a shape in which standing pieces 3b and 3c are bent and formed on two adjacent sides of a rectangular steel plate 3a. As shown in FIG. 4, when the steel plate formwork to be described later is arranged, the base metal fitting 3 comes to four corners of the bottom face of the steel plate formwork, and each standing piece comes on an extension line of each side of the bottom face of the pillar formwork. Are arranged as follows. Reference numeral 4 denotes a steel form frame having a rectangular cross section placed on the foundation concrete floor 1, and the steel form frame 4 is formed by bending a steel plate into a cylindrical body. The installation position of the steel mold 4 is arranged so that each corner of the steel mold 4 and each corner of the base metal fitting face each other as shown in FIG.

Reference numeral 5 is a vertical stiffening member formed of a rectangular steel pipe. The vertical stiffening member 5 is a cut for inserting a lateral stiffening member, which will be described later, at a predetermined position in the vertical direction as shown in FIG. Embedded part 5a
Are provided in plural. Reference numeral 7 denotes a leg fixing metal fitting attached to one surface of the lower end portion of the vertical stiffening member 5, and the leg fixing metal fixture 7 is manufactured by pressing a steel plate. As shown in FIG. 7, the leg fixing metal fittings 7 are fixed pieces 7
The fixing piece 7a is screwed to the vertical stiffener 5. Locking piece 7b and longitudinal stiffener 5
There is provided a gap between and at which the upright pieces 3b and 3c of the base metal fitting 3 can be fitted. The longitudinal stiffening member 5 is installed by engaging the locking piece 7b and the upright piece 3b of the base metal fitting 3 with the notch 5a facing the steel form 4 side.

Reference numeral 15 denotes a lateral stiffening member made of flat steel or the like. The lateral stiffening member 15 has a plurality of position adjusting holes 15a at predetermined positions at both ends thereof as shown in FIG. A scale corresponding to the column to be constructed is provided near the position adjusting hole 15a. Further, as shown in FIG. 9, the lateral stiffening member 15 is fitted into the notch 5a of the vertical stiffening member 5, and both ends thereof extend a predetermined length outward from the steel form frame 4. . At this time, as shown in FIG. 10, one side surface of the lateral stiffening member 15 abuts on the inner side of the cut portion of the vertical stiffening member, and the other side surface is flush with the side surface of the vertical stiffening member. Has become. As a result, one side surface of the lateral stiffening material 15 and one side surface of the vertical stiffening material can come into contact with the side surface of the steel form 4. 20
Is a fixing pin that is inserted through the position adjusting holes of the transverse stiffening member 15 which are orthogonal to each other. The fixing pin is formed by overlapping the position adjusting holes corresponding to the column size of the lateral stiffening member 15 as shown in FIG. Be sure to insert it in both holes.

Next, the method for constructing the formwork will be described below. 1. Installation of base metal fittings and steel plate formwork Marking the pillar position on the foundation concrete floor 1 with the outside diameter of the pillar (Fig. 12), and nailing the base metal fitting 3 to the foundation concrete floor 1 according to the marked reference line. Strike (Fig. 4). At this time, the tops of the base metal fittings 3 on the standing piece side are opposed to the four corners of the pillar, and the standing pieces are arranged on the extension lines of the bottom of the pillar. The steel plate form formed on the cylinder is laid and installed in line with the reference line marked by a crane (Fig. 5).

2. Formation and Installation of Stiffening Frame Next, the two vertical stiffening members 5 are stood upright at a distance equal to the width of the form surface for stiffening, and the notch 5 of each vertical stiffening member 5 is formed.
The lateral stiffener 15 is fitted into a to form the stiffening frame shown in FIG. The remaining three stiffening frames are formed in the same manner. After that, the leg fixing fittings 7 are attached to the lower ends of the respective longitudinal stiffening members 5. After forming the other three stiffening frames, the standing pieces 3b of the base metal fitting 3 are inserted into the gaps between the locking pieces 7b of the leg fixing fittings 7 and the side surfaces of the vertical stiffening member 5, and the standing pieces 3b Using the piece 3b as a guide, the vertical stiffening member 5 is slid into the steel plate form 4 side (FIG. 14), and the stiffening frame is brought into contact with the side surface of the steel plate form 4 (FIG. 15). Similarly, the other three stiffening frames are installed. If you do this,
Positioning of the stiffening frame can be performed very easily and accurately.

3. Connection of stiffening frames After setting all stiffening frames, finely adjust the position of the lateral stiffening member 15 that constitutes the stiffening frame, and fix the fixing pin 20 in the position adjusting hole 15a corresponding to the column size. The stiffening frames adjacent to each other are inserted and connected to each other, and thereby the steel plate form 4 is constrained (FIG. 11). When the strength and rigidity of the lateral stiffening member 15 are insufficient, the vertical stiffening member 31 formed of a square steel pipe or the like is provided between the longitudinal stiffening members 5 as shown in FIG. One side is brought into contact with the lateral stiffener 15 and restrained by the wire 33 to be attached. In FIG. 16, reference numeral 35 is a hook provided on the back surface of each longitudinal stiffener 5, and the wire 33 is hung on this hook 35. FIG. 17 shows AA of FIG.
FIG. 6 is a cross-sectional view showing an attached state of the vertical stiffening member 31. When the wire rope is rotated in the circumferential direction and tightened in this manner, the restraining force of the stiffening material becomes the same on all surfaces, and large bending deformation of the form due to variations in the tightening force can be prevented. In this way, after assembling the stiffening frame, the number of stiffening materials corresponding to the required strength can be added, which facilitates manual construction.

4. Dismantling Dismantling is performed by pulling out the fixing pin 20 and sequentially removing each stiffening frame. Since there are no parts to be buried in concrete like separators, there are almost 10 parts for stiffening.
0% reuse is possible and economical. Further, even when additional stiffening is performed, only the work of removing the wire 33 is added, and the dismantling work can be performed extremely easily. In addition, although an example in which the thin steel plate is used as the discarding formwork is shown in the present embodiment, even when the formwork is not used as the discarding formwork, this construction method can be applied. Since it is not fastened to the pillar body, it can be disassembled more easily than usual.

The leg fixing metal fitting 7 attached to the lower end portion of the vertical stiffening member 5 is formed by using a corrugated metal fitting 40 as shown in FIG. 18, and the height of the leg can be adjusted by a bolt 41. Good.

[0017]

According to the present invention, a stiffening frame is formed by the vertical stiffening material and the lateral stiffening material standardized as described above, and the stiffening frame is installed on the side surface of the mold. Since each stiffening frame is connected with a fixing pin according to the size of the pillar to be constructed, it is possible to obtain the precision of the formwork very easily without using a separator and maintain this precision. Also, it is easy to assemble and disassemble.

Further, since the vertical stiffening member is provided with a plurality of notches in advance and the transverse stiffening member is installed over the notches, the stiffening member can be positioned in the height direction. It is unnecessary and has good workability.

[Brief description of drawings]

FIG. 1 is a front view of a pillar frame device according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a perspective view of a base metal fitting.

FIG. 4 is an explanatory view illustrating the arrangement of base metal fittings.

FIG. 5 is an explanatory diagram for explaining the arrangement of the steel form.

FIG. 6 is a perspective view of a longitudinal stiffener.

FIG. 7 is a perspective view of a leg fixing bracket.

FIG. 8 is a perspective view of a lateral stiffener.

FIG. 9 is an explanatory diagram illustrating a method of attaching a lateral stiffening member.

FIG. 10 is an explanatory diagram illustrating a mounting state when a lateral stiffening member is mounted on a vertical stiffening member.

FIG. 11 is an explanatory diagram illustrating a method of connecting the lateral stiffening members.

FIG. 12 is an explanatory diagram for explaining the marking out state of the reference line.

FIG. 13 is a front view of a stiffening frame.

FIG. 14 is an explanatory diagram illustrating a method of attaching the stiffening frame to the base metal fitting.

FIG. 15 is an explanatory diagram illustrating a mounting state in which the stiffening frame is mounted on the base metal fitting.

FIG. 16 is an explanatory diagram illustrating a state in which a vertical stiffening material is added.

17 is a cross-sectional view taken along the line AA of FIG.

FIG. 18 is a perspective view of another embodiment of the leg fixing bracket.

[Explanation of symbols]

 1 Foundation concrete floor 3 Foundation metal fittings 4 Steel plate formwork 5 Longitudinal stiffening material 5a Cut part 7 Leg fixing metal fittings 15 Lateral stiffening material

Claims (2)

[Claims] 1. A rectangular cylindrical formwork erected at a predetermined position on a foundation concrete floor, a plurality of foundation fittings arranged at respective corners of the formwork and fixed on the foundation concrete floor, A column-shaped vertical column that is erected on the outside of each side surface of the mold, has its lower end attached to each of the base metal fittings, and has a plurality of notches recessed from the mold side at a plurality of vertical positions. The direction stiffening material and both ends are fitted into the notch of the longitudinal stiffening material, and the both ends extend outward from the width of each surface of the mold,
A lateral stiffening member having position adjusting holes at predetermined positions on both ends in the longitudinal direction, and the lateral stiffening members are joined by penetrating the position adjusting holes at respective overlapping corners of the lateral stiffening member. A concrete formwork device for a pillar, comprising: 2. A base metal fixture fixing step of fixing base metal fixtures to corner portions of the formwork erected position on the foundation concrete floor, and a rectangular tubular formwork is installed at the formwork erected position. Forming step and two columnar vertical stiffeners having notches formed at a plurality of longitudinal points are provided side by side for a predetermined period, and the vertical stiffeners are provided with the notches. Both ends extend outward from the width of each surface of the mold, and lateral stiffening members having position adjusting holes are installed at predetermined positions on both ends in the longitudinal direction to form a stiffening frame. A stiffening frame forming step, and a plurality of stiffening frames formed in the stiffening frame forming step are installed on the outer surface of the mold by attaching the lower ends of the longitudinal stiffening members to the base metal fittings. The stiffening frame installation process and the stiffening frame installation process A lateral stiffener joining step of joining the lateral stiffeners by inserting a connecting pin through the position adjusting holes at both overlapping ends of the lateral stiffeners of the stiffening frame. A method for constructing concrete formwork for pillars.