JPH11303384A - Concrete form and work execution method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete form lightweight, easily built up and improving work efficiency, and its work execution method. SOLUTION: A concrete form comprises lightweight channel steel 2a, 2b arranged on a base 1 facing at a specified space; styrene foam panels 4, 4 of specified size with the lower end parts fitted facing into the channels of the lightweight channel steel 2a, 2b; lightweight channel steel 2b, 2b fitted to the upper ends of the facing styrene foam panels 4, 4; and fasteners for holding the facing space of the facing styrene foam panels 4, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete formwork and a method for constructing the formwork, and more particularly, to a concrete formwork made of a combination of a styrofoam panel and a lightweight grooved steel so that it is lightweight, easy to assemble and work. The present invention relates to a novel structure and a construction method of a concrete formwork capable of shortening the construction time.

[0002]

2. Description of the Related Art In concrete buildings and the like, as a form used for pouring ready-mixed concrete into a predetermined shape and curing it, a wooden form is conventionally used. Plastic versions are also available. This concrete formwork must be made in accordance with the design of the building or the like to be constructed, and it is inherently impossible to use a ready-made size one for general use except for a universal design part. Therefore, concrete formwork is produced and cut out of wood such as plate materials in accordance with design dimensions at a construction site or the like. The formwork after the concrete molding was dismantled and reusable ones were repaired, and non-reusable ones were disposed of as waste materials.

[0003]

However, all of the conventional molds are heavy, and need to be transported, processed, assembled,
Dismantling takes labor and time. In addition, the construction work is complicated and troublesome, such as the mutual arrangement of the formwork and the installation of the reinforcing metal fittings at the time of the formwork construction. In addition, there is a disadvantage that the damage to the formwork due to freezing and drying due to a temperature change during curing after concrete casting must be repaired or managed.

In view of the above circumstances, the present invention provides a novel concrete formwork that is lightweight, easy to assemble and work, and improves work efficiency, and a method of working the same.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a concrete form in which a part of or the entire outer peripheral portion of a styrofoam panel is fitted with lightweight grooved steel, and a lower end of a rectangular styrofoam panel. Concrete formwork whose lower and upper ends are fitted with lightweight channel steel, and one or both of the lower and upper ends and both ends of a rectangular styrofoam panel are fitted with lightweight channel steel. Is provided as a basis. A lightweight grooved steel faced at a predetermined interval on the base; a styrofoam panel of a predetermined size in which the lower end face is fitted in the groove of the lightweight grooved steel; and an upper end of the facing styrofoam panel Provided is a concrete formwork comprising a lightweight channel steel fitted into a portion and a fastener for maintaining a facing distance between the facing polystyrene panels. Furthermore, the structure which consists of the width stop bolt and nut inserted between the Styrofoam panels which the fastener faces, the structure which consists of the width stop fitting which fastened the upper end face of the Styrofoam panel which the fastener faces, the both ends of the Styrofoam panel One or both are fitted with lightweight grooved steel, the lightweight grooved steel is configured such that one or both of the left and right ends of the groove are opened outward, and the Styrofoam panel has a density of 25 kg / providing a structure m is ³ or more.

[0006] As a construction method, a lightweight grooved steel is fixed to face the base at a predetermined interval, and a styrofoam panel is fitted in the groove of the lightweight grooved steel to stand upright, and the upper end of the facing styrofoam panel is erected. Is provided on the basis of a concrete formwork construction method of fitting with a lightweight channel steel. Further, a method of fitting one or both of the both end portions of the facing Styrofoam panel with lightweight grooved steel, a method of inserting a locking bolt between the facing Styrofoam panels and tightening them, and an upper end face of the facing Styrofoam panel. Method of fastening with width stopper, density 25 kg as Styrofoam panel
/ M ³ or more.

Therefore, according to the present invention, since the concrete formwork in which the styrofoam panel and the lightweight grooved steel are combined is used, the weight is reduced and the burden of labor is reduced.
Since the on-site processing work can be greatly reduced, the formwork assembling / disassembling work becomes easy. That is, the present invention is characterized in that a concrete form is constituted by a combination of a styrofoam panel (a panel made of styrofoam resin) and a lightweight channel steel, and a high-density hard styrofoam panel described later is used as the styrofoam panel. Thereby, while maintaining the strength as a concrete formwork, lightness, easiness of processing, recyclability, heat insulation, and water resistance can be realized.
In addition, by fitting a lightweight grooved steel to a part or the whole of the outer peripheral portion of the Styrofoam panel, necessary strength as a concrete formwork, ease of handling, ease of construction, and reliability are realized.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, a pair of lightweight channel steels 2a, 2a are fixed at a predetermined width along a reference line drawn on a base 1 such as a concrete floor or the ground which has already been constructed. The lightweight channel steel 2a is a member having a U-shaped cross section, and is lightweight, thin, and has shape retention. The groove, which is the opening of the lightweight channel steel 2a, is turned upward, and the bottom of the groove width is fixed to the base 1 by a fixing member 3 such as a screw. In addition, as shown in FIG. 4, one or both of the left and right ends of the lightweight channel steel 2a may be opened obliquely outward to form the guide portion 12.

[0009] The lightweight channel steel 2a,
The Styrofoam panel 4 is fitted into the groove 2a. In the work of fitting the Styrofoam panel 4 into the lightweight channel steels 2a, 2a, the lower end of the Styrofoam panel 4 is not inserted vertically into the grooves of the lightweight channel steels 2a, 2a.
It can be inserted slightly obliquely along the guide portion 12 described above.

The styrene foam panel 4 has a density of 25.
It is appropriate to use one of kg / m ³ or more. In Examples described later, the density was 63.1 kg / m ³ and the compressive strength was 3.5.
Those having physical properties of 9 kgf / cm ² , bending strength of 72.8 kgf / cm ² and water absorption of 0.24 g / 100 cm ² were used. The Styrofoam panel 4 of this embodiment is a high-density rigid panel known as a Styrofoam tatami floor in place of the conventional straw tatami floor. Further, one or more reinforcing members 14 (see FIG. 4) such as a polystyrene net or a mesh wire mesh may be used for reinforcement in the styrofoam panel 4. Further, the strength of the styrofoam panel 4 can be imparted by the lightweight channel steel 2a or the lightweight channel steels 2b and 2c described later.

Next, the styrofoam panels 4 facing each other
As fasteners for maintaining the facing distance of 4, a through-hole 5, 5 is formed in one surface of the styrofoam panels 4, 4 facing each other substantially in parallel with the base 1, and a washer 6 is provided in the through-hole 5, 5. The fixing bolt 7 is inserted and fastened with a hexagon nut 8. Thus, even when concrete is cast, the distance D between the Styrofoam panels 4 can be kept constant. As shown in FIG. 4, the width-stopping bolt 7 may be a width-stopping bolt 13 having the same structure as the conventional one. Also, the width fixing bolts 7 may be attached as described above by piercing the through holes 5 and 5 by overlapping the Styrofoam panels 4 and 4 before fitting them into the lightweight channel steels 2a and 2a.

Further, lightweight channel steels 2c, 2c having a U-shaped cross section similar to the lightweight channel steels 2a, 2a are fitted to one or both of the two end portions of the styrene foam panels 4, 4 to form a reinforcing material. The lightweight channel steels 2c, 2c may be merely fitted to the side ends of the styrofoam panels 4, 4, but it is desirable to fix them to the styrofoam panel 4 with screws or the like. At this time, in order to connect the Styrofoam panels 4, 4 in the left-right direction, it is desirable to fit the lightweight channel steels 2c, 2c so as not to protrude from the side ends of the Styrofoam panels 4, 4. Further, when a gap is formed between the side end portions of the styrofoam panel 4 that is connected to each other, the gap can be closed with an appropriate caulking material. Furthermore,
As the lightweight channel steels 2c, 2c, lightweight channel steels having an H-shaped cross section can be used. In this case, the Styrofoam panels 4 can be continuously provided in the left-right direction by the lightweight channel steels having an H-shaped cross section. Further, when the styrofoam panel 4 is to be overlaid on the styrofoam panel 4, the lightweight channel steel 2 can be used.
As b, a lightweight channel steel having an H-shaped cross section can be used.

Next, lightweight channel steels 2b, 2b having the same U-shaped cross section as the lightweight channel steel 2a are fitted in the longitudinal direction at the upper end portions of the styrofoam panels 4, 4 arranged opposite to each other, and the styrofoam to be further opposed to each other. As a fastener for maintaining the facing distance between the panels 4 and 4, the width stopper 10 is bridged at a predetermined interval between the lightweight grooved steels 2b and 2b, and the width stopper 10 is fixed to a fixing member 11, such as a screw. At 11, they are connected to the lightweight channel steels 2 b, 2 b and the styrofoam panels 4, 4. Therefore,
The Styrofoam panels 4 and 4 are integrated with a certain interval D and installed vertically with the base 1 while maintaining strength. This completes the formwork installation operation.

Therefore, when the concrete is removed after the concrete is poured and solidified between the styrofoam panels 4 and 4 and a certain curing period has elapsed, the fixing member 11 is removed and the width stopper 10 is removed. Hex nut 8 is removed, width fixing bolt 7 is removed, and lightweight channel steel 2b is provided at the upper end.
Is removed from the base 1 together with the lightweight styrofoam panel 4 together with the lightweight channel steel 2a or individually.

[0015]

[Specifications]

Styrofoam panels 145 sheets x 2 (145 sheets of 60 cm width and 145 sheets of 40 cm width) 42 sheets of Styrofoam cut products (60 x 90 x 16 cm)
T in the packed material) [construction] quantity extension 343m ² ~370m ² (pillar foundation 70m ^2, ground beams 13
1m ² , Building foundation 87m ² , 55m ² ) [Construction order] 1st pillar base, 2nd underground beam, 3rd building foundation, 4th
Next entrance / soil [Construction method] a. A lightweight grooved steel 2a having a predetermined RC thickness and a width of 2 cm is fixed in parallel to the base by RC screws as a fixing member 3 in a length of 30 cm.
Keep at intervals. B. The Styrofoam panel 4 is inserted into the lightweight channel steel 2a and stands upright, and the lightweight channel steel 2b is fitted into the upper surface of the Styrofoam panel 4 as well. C. The lightweight channel steel 2b at the upper part of the styrofoam panel 4 is adjusted to a predetermined inner width, and a wooden board having a width of about 10 cm as the width stopper 10 is arranged at regular intervals in parallel with metal screws as the fixing member 11 at a pitch of 40 to 50 cm. Fasten and fix. D. A crosspiece (3 × 6 cm square wood = flap angle) is applied to the center of the sides of the styrofoam panels 4 and 4 facing each other, and a small hole as a through hole 5 is formed together with the panels on both sides, and 40 to 50 cm.
A metal bolt as a width fixing bolt 7 is inserted while maintaining a predetermined inner width at a pitch, and the metal bolt is tightened using a hexagon nut 8 and a washer 6. E. Reinforce the key points of the assembled formwork with support materials. [Assembly days] 6 days in total (2 days for installation of lightweight grooved steel, 4 days for assembly) [Assembly personnel] 28 people in total (4 people for light weight grooved steel, 24 assembly) (Breakdown: 12 full-scale workers, temporary workers) [Construction cost] About 947,500 yen (Styrofoam panel and filling material 4)
15,000 yen, lightweight channel steel, 78,000 yen, reinforced wood 34,000 yen,
Wage 420 thousand yen)

<< 2. Regarding the construction status of the above construction >> a. Although the assembly was carried out according to the conventional construction method, it was light in weight, so that the carrying and assembling labor was remarkably reduced, the working time was shortened, and the material was soft, so that on-site processing was extremely easy. Although 16 temporary workers were engaged in assembling, the difficulty was low, so there was no problem. b. The formwork used for the foundation base and underground beams to be buried underground was covered without removing part of the formwork, eliminating the need for dismantling work and shortening the work time. c. One day after placing the RC, the work of removing the formwork of a part of the underground beam was performed, but it was easily detached, no damage or deformation was observed, and the adhesion of the cement agent was slight. d. The loose pieces were used again for the foundation of the building, but they were sufficient. After dismantling the ones for the building foundation, an inspection confirmed that most could be used again. Therefore, it is considered that the Styrofoam panel can be used as a mold frame of 3 degrees or more.

<< 3. Comparison with wooden formwork >> Formwork cost, incidental materials, and wages are determined by the contractor's estimate.
When calculated as 70 m ² × ＠ 4000 / m ² , about 1,4
It is 80,000 yen. As for workability, the assembly days are 28 days in total, and the assembly staff is 32 people.

[0018]

According to the present invention described above, the use of the styrofoam panel reduces the weight of the formwork.
It is excellent in heat retention and suitable for concrete curing.In addition, by using styrofoam panels of a predetermined size, it can be used repeatedly without cutting and other processing.Furthermore, by using lightweight grooved steel, the styrofoam panels are nailed on the base. It is easy to fix and disassemble without fixing, etc., thus simplifying the processing, assembling construction and dismantling work of the formwork, reducing the burden of labor, shortening the construction period, and cost Was saved.

That is, by using a styrofoam panel as a concrete form, the weight can be significantly reduced as compared with a conventional form made of wood or the like, the handling is easy, and a desired shape can be obtained on site. Can be cut. Specifically, it is easy to remove the form after the concrete is solidified, and the adhesion of concrete to the form is small. It can be reused repeatedly. It is also possible to cover the soil without removing the formwork. Easy to carry, reduced assembling labor, reduced working time, and easy on-site processing.

Further, by using a styrofoam panel having a density of 25 kg / m ³ or more, it is possible to realize the strength required for a formwork and to withstand the pressure of concrete. Furthermore, by reinforcing the styrofoam with lightweight grooved steel, the construction of the formwork is facilitated, and the styrofoam panel is reinforced to enable the strength required for the formwork to be used repeatedly, thereby improving handling. Can be.

According to the construction method of the present invention, since the styrofoam panel can be placed on a lightweight channel steel having a U-shaped cross section, the work can be carried out. , Work effort can be reduced.

Therefore, according to the present invention, the concrete formwork is constituted by the combination of the styrofoam panel and the lightweight channel steel, thereby maintaining the strength of the concrete formwork while maintaining the lightness, ease of processing, recyclability, and the like.
Heat insulation and water resistance can be realized. In addition, by fitting the lightweight grooved steel to a part or the whole of the outer peripheral portion of the Styrofoam panel, it is possible to realize the necessary strength, handleability, ease of construction, and reliability required for the concrete formwork.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2a, 2b, 2c ... Lightweight grooved steel 3 ... Fixing member 4 ... Styrofoam panel 5 ... Through hole 6 ... Washer 7, 13 ... Width fixing bolt 8 ... Hex nut 10 ... Width fixing tool 11 ... Fixing member 12 ... Guide part 14: Reinforcing material

Claims (14)

[Claims] 1. A concrete formwork wherein a part or all of an outer peripheral portion of a Styrofoam panel is fitted with lightweight grooved steel. 2. A concrete formwork wherein a lower end and an upper end of a rectangular styrofoam panel are fitted with lightweight channel steel. 3. A concrete formwork wherein one or both of a lower end, an upper end, and both side ends of a rectangular Styrofoam panel are fitted with lightweight channel steel. 4. A light-weight grooved steel faced at a predetermined interval on a base, a styrofoam panel of a predetermined size fitted into a groove of the light-weight grooved steel face and fitted with a lower end, and the facing styrofoam foam A concrete formwork comprising: a lightweight channel steel fitted to an upper end portion of a panel; and a fastener for maintaining a facing distance between the facing Styrofoam panels. 5. The concrete formwork according to claim 4, wherein the fastener comprises a width-locking bolt and a nut inserted between styrofoam panels facing each other. 6. The concrete formwork according to claim 4, wherein the concrete formwork comprises a width-stop fitting to which an upper end surface of the Styrofoam panel facing the fastener is fastened. 7. One or both ends of a styrofoam panel are fitted with lightweight channel steel.
The concrete formwork described. 8. The concrete according to claim 1, 2, 3, 4, 5, 6, or 7, wherein one or both of the left and right ends of the groove is opened outward. Formwork. 9. The styrofoam panel has a density of 25 kg /
Claim 1,2,3,4,5,6 m is ³ or more,
The concrete formwork according to 7 or 8. 10. A lightweight grooved steel is fixed to the base at a predetermined interval, and a styrofoam panel is fitted and erected in the groove of the lightweight grooved steel, and the upper end of the facing styrofoam panel is lightweight grooved. A concrete formwork construction method characterized by fitting with a mold steel. 11. A light-weight grooved steel is used to fit one or both of the opposite ends of the styrofoam panel facing each other.
The described concrete formwork construction method. 12. The method for constructing a concrete formwork according to claim 10, wherein a fastening bolt is inserted between said facing polystyrene foam panels to tighten them. 13. The method for constructing a concrete formwork according to claim 10, 11 or 12, wherein an upper end surface of the facing polystyrene foam panel is fastened with a clasp. 14. A styrofoam panel having a density of 25.
10. The method of claim 10, 11, or 1 wherein the weight is at least kg / m ^3.
14. The method for constructing a concrete formwork according to 2 or 13.