JP3684196B2 - Floor slab structural material - Google Patents

Floor slab structural material Download PDF

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Publication number
JP3684196B2
JP3684196B2 JP2001401309A JP2001401309A JP3684196B2 JP 3684196 B2 JP3684196 B2 JP 3684196B2 JP 2001401309 A JP2001401309 A JP 2001401309A JP 2001401309 A JP2001401309 A JP 2001401309A JP 3684196 B2 JP3684196 B2 JP 3684196B2
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Japan
Prior art keywords
lattice
chord
supporting
parallel
self
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Expired - Fee Related
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JP2001401309A
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Japanese (ja)
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JP2003193607A (en
Inventor
太郎 河西
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太郎 河西
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Description

【0001】
【発明が属する技術分野】
この発明は、コンクリート床版の構築に使用する型枠と自立型トラスよりなる構造材に関し、特に、自立型トラスの端部固定部材の構造に関する。
【0002】
【従来の技術】
従来のコンクリート床版の構築においては、図2の正面図(a)および側面図(b)に示すように、1本の上弦筋11と2本の下弦筋12を三角状に配置し、波状に屈曲させたラチス筋13の上側折曲部15を上弦筋11に溶接し、ラチス筋13の下部を下弦筋12に溶接して自立型トラス1を形成したのち、このラチス筋13の下側折曲部16をデッキプレート、キーストンプレート、リブプレートなどの平行な複数の溝型を形成した鉄板2に溶接して構造材を作り、この構造材を横梁3の間に架け渡して、鉄板2を捨て型枠としてコンクリートを打設する施工法が実施されている。
【0003】
この施工法によると、自立型トラス1によって打設されたコンクリートの仮設的な荷重を支持することができるので、型枠となる鉄板2を下側から保持する保持部材が不要であり、したがって、コンクリート打設後の型枠解体作業が不要になる。そして、コンクリートの硬化後には、自立型トラス1が鉄筋コンクリートの主筋の役目を果たすものである。
【0004】
【発明が解決しようとする課題】
施工に際して構造材を横梁3に架け渡すと、図2に示すように、鉄板2の端部を横梁3の上に載置することになるので、横梁3で自立型トラス1を直接支持させるために、上弦筋11および下弦筋12の端部を突出させ、2本の下弦筋12の突出部に水平方向に第1の鉄筋21を溶接し、上弦筋11の端部と第1の鉄筋21の中央部との間に垂直方向に第2の鉄筋22を溶接して端部固定部材20を形成する。この第2の鉄筋22の下端部は、横梁3に載置される鉄板2の上面に突き合わせるか、横梁3の形状に合わせて、図2の側面図(c)に示すように、クランク状に曲げられている。
【0005】
このような構造材を使用して、コンクリートを打設すると、構造材の自重および打設されたコンクリートの仮設的な重量を端部固定部材20を介して自立型トラス1により横梁3で支持することができる。
【0006】
しかし、垂直な第2の鉄筋22に作用する荷重により、突出した上弦筋11に曲げモーメントが作用し、下弦筋12には水平な第1の鉄筋21を介して荷重を支持することになり、しかも、垂直な1本の第2の鉄筋22によって、端部の全荷重を支持することになる。
【0007】
そこで、この発明は、このような構造材における自立型トラス1の端部固定部材20が具備する課題を解決し、端部固定部材20の剛性を高くし、荷重を分散させるために考えられたものである。
【0008】
【課題を解決するための手段】
この発明の床版の構造材は、1本の上弦筋11と2本の下弦筋12を三角状に配置し、波状に屈曲させた2本のラチス筋13の上側屈曲部15を上弦筋11に溶接し、各ラチス筋13の下部に下弦筋12をそれぞれ溶接して自立型トラスを1形成し、この自立型トラス1の端部における外下向きに開く斜めの端部ラチス筋13に対して、支持用鉄筋14を平行に添設して下端部 17 を上弦筋および下弦筋と平行に曲げ、この支持用鉄筋14を上弦筋11および下弦筋12に溶接して端部固定部材10を形成し、ラチス筋13の下側屈曲部を平行な複数の溝型を形成した鉄板に溶接したものである。
【0009】
また、自立型トラスの端部におけるラチス筋13の略1ピッチ分に対して、支持用鉄筋14a、14bを平行に添設して、上弦筋11および下弦筋12と交差する部分を溶接して端部固定部材を形成してもよいのである。
【0010】
【発明の実施の形態】
(第1の実施形態)
図1の正面図(a)および側面図(b)に示すように、1本の上弦筋11と2本の下弦筋12を三角状に配置し、波形に屈曲させた2本のラチス筋13の各上側屈曲部15で上弦筋11を挟むように溶接し、各ラチス筋13の下部に下弦筋12をそれぞれ溶接して自立型トラス1を構成する。
【0011】
この自立型トラス1の端部において、外下向きに開く斜めのラチス筋 13 で終端させ、この端部ラチス筋13に対して、それぞれ支持用鉄筋14を添設し、この支持用鉄筋14を上弦筋11および下弦筋12に溶接する。
【0012】
そして、端部ラチス筋13に添設された2本の支持用鉄筋14の下端部17を、横梁3に載置される鉄板2の上面に沿うように上弦筋および下弦筋と平行に曲げるか、図1(c)に示すように、横梁3の形状に合わせてクランク状に曲げて端部固定部材10を形成する。
【0013】
このように構成された自立型トラス1をデッキプレート、キーストンプレート、リブプレートなどの平行な複数の溝型を形成した鉄板2の上に載置し、2本のラチス筋13の各下側屈曲部16を鉄板2に溶接して床版の構造材を作る。
【0014】
そして、この構造材を横梁3の間に架け渡し、鉄板2を捨て型枠としてコンクリートを打設して床スラブを構築するのである。
【0015】
(第2の実施形態)
以上で説明した第1の実施形態においては、自立型トラス1の端部において、外下向きに開く斜めの端部ラチス筋13に対して、支持用鉄筋14を添設し、この支持用鉄筋14を上弦筋11および下弦筋12に溶接しているが、第2の実施形態においては、図1の側面図(d)に示すように、自立型トラス1の端部におけるラチス筋13の略1ピッチ分に沿わせるように、支持用鉄筋14a、14bを添設して、上弦筋11および下弦筋12と交差する部分を溶接して端部固定部材を形成し、ラチス筋13の各下側屈曲部16を鉄板2に溶接して床版の構造材を構成する。
【0016】
このように、端部ラチス筋13の略1ピッチ分に沿わせるように、支持用鉄筋14a、14bを添設することにより、構造材を横梁3の間に架け渡してコンクリートを打設したとき、横梁3の上において作用する剪断応力に耐えることができる。
【0017】
【発明の効果】
以上で説明した実施の形態に基づく説明から明らかなように、この発明の床版の構造材によると、端部固定部材10の剛性が高く、構造材の自立型トラス1を横梁3で支持する際に、端部ラチス筋13に溶接された2本の支持用鉄筋14、14aによって荷重を支持するので、横梁3上において荷重を分散させることができる。
【図面の簡単な説明】
【図1】この発明の床版の構造材を示す正面図(a)および側面図(b)〜(d)、
【図2】従来の床版の構造材を示す正面図(a)および側面図(b)(c)である。
【符号の説明】
1 自立型トラス
2 溝型を形成した鉄板
3 横梁
10 固定部材
11 上弦筋
12 下弦筋
13 ラチス筋
14、14a 支持用鉄筋
15 上側屈曲部
16 下側屈曲部
17、17a 支持用鉄筋の下端部
[0001]
[Technical field to which the invention belongs]
The present invention relates to a structural material including a formwork used for construction of a concrete slab and a self-supporting truss, and more particularly to a structure of an end fixing member of the self-supporting truss.
[0002]
[Prior art]
In the construction of a conventional concrete slab, as shown in a front view (a) and a side view (b) of FIG. 2, one upper chord 11 and two lower chords 12 are arranged in a triangular shape, and are wavy. After welding the upper bent portion 15 of the lattice 13 bent to the upper chord 11 and welding the lower part of the lattice 13 to the lower chord 12 to form the self-supporting truss 1, the lower side of the lattice 13 The bent portion 16 is welded to an iron plate 2 formed with a plurality of parallel grooves such as a deck plate, a keystone plate, and a rib plate to make a structural material. The structural material is bridged between the cross beams 3 and the iron plate 2 A construction method has been implemented in which concrete is cast as a formwork.
[0003]
According to this construction method, since a temporary load of concrete placed by the self-supporting truss 1 can be supported, a holding member for holding the iron plate 2 as a formwork from the lower side is unnecessary. No need to dismantle formwork after placing concrete. And after hardening of concrete, the self-supporting truss 1 plays the role of the main reinforcement of reinforced concrete.
[0004]
[Problems to be solved by the invention]
When the structural material is crossed over the cross beam 3 during construction, the end of the iron plate 2 is placed on the cross beam 3 as shown in FIG. 2, so that the self-supporting truss 1 is directly supported by the cross beam 3. The ends of the upper chord 11 and the lower chord 12 are protruded, and the first reinforcing bars 21 are welded to the protruding portions of the two lower chords 12 in the horizontal direction. The end reinforcing member 20 is formed by welding the second rebar 22 in the vertical direction between the center portion of the end portion fixing member 20. The lower end portion of the second reinforcing bar 22 is abutted against the upper surface of the iron plate 2 placed on the cross beam 3 or, as shown in the side view (c) of FIG. Is bent.
[0005]
When concrete is placed using such a structural material, the weight of the structural material and the temporary weight of the placed concrete are supported by the transverse beam 3 by the self-supporting truss 1 via the end fixing member 20. be able to.
[0006]
However, due to the load acting on the vertical second reinforcing bar 22, a bending moment acts on the protruding upper chord 11 and the lower chord 12 supports the load via the horizontal first reinforcing bar 21, In addition, the entire load at the end is supported by one vertical second reinforcing bar 22.
[0007]
Therefore, the present invention was conceived to solve the problems of the end fixing member 20 of the self-supporting truss 1 in such a structural material, to increase the rigidity of the end fixing member 20 and to distribute the load. Is.
[0008]
[Means for Solving the Problems]
The structural material of the floor slab of this invention has one upper chord muscle 11 and two lower chord muscles 12 arranged in a triangular shape, and the upper bent portion 15 of the two lattice muscles 13 bent in a wave shape is the upper chord muscle 11. To the lower part of each lattice 13 to form a self-supporting truss 1 and against the diagonal end lattice 13 that opens outward at the end of the self-supporting truss 1 The supporting bar 14 is attached in parallel, the lower end 17 is bent in parallel with the upper chord and the lower chord, and the supporting bar 14 is welded to the upper chord 11 and the lower chord 12 to form the end fixing member 10. The lower bent portion of the lattice 13 is welded to an iron plate having a plurality of parallel groove shapes.
[0009]
Further, supporting rebars 14a and 14b are attached in parallel to approximately one pitch of the lattice 13 at the end of the self-supporting truss, and the portions intersecting with the upper and lower chords 11 and 12 are welded. An end fixing member may be formed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
As shown in the front view (a) and the side view (b) of FIG. 1, two lattice muscles 13 are arranged such that one upper chord muscle 11 and two lower chord muscles 12 are arranged in a triangular shape and bent into a waveform. Each of the upper bent portions 15 is welded so that the upper chord 11 is sandwiched, and the lower chord 12 is welded to the lower portion of each lattice 13 to constitute the self-supporting truss 1.
[0011]
The end of the self-supporting truss 1 is terminated by an oblique lattice 13 that opens outward, and a supporting rebar 14 is attached to the end lattice 13. Weld to muscle 11 and lower chord muscle 12.
[0012]
Then, the lower end 17 of the two supporting reinforcing bars 14 attached to the end lattice 13 is bent in parallel with the upper and lower chords so as to be along the upper surface of the steel plate 2 placed on the transverse beam 3. As shown in FIG. 1 (c), the end fixing member 10 is formed by bending in a crank shape in accordance with the shape of the cross beam 3.
[0013]
The self-supporting truss 1 configured in this way is placed on an iron plate 2 having a plurality of parallel groove shapes such as a deck plate, a keystone plate, and a rib plate, and each lower flexion of the two lattice muscles 13 is bent. The part 16 is welded to the iron plate 2 to make a structural material for the floor slab.
[0014]
And this structural material is bridged between the cross beams 3, and the floor slab is constructed by placing concrete with the iron plate 2 being discarded as a formwork.
[0015]
(Second Embodiment)
In the first embodiment described above, the supporting reinforcing bar 14 is attached to the oblique end lattice 13 that opens outward at the end of the self-supporting truss 1. Are welded to the upper chord 11 and the lower chord 12, in the second embodiment, as shown in the side view (d) of FIG. 1, approximately 1 of the lattice 13 at the end of the self-supporting truss 1. Supporting reinforcing bars 14a and 14b are provided so as to be along the pitch, and end fixing members are formed by welding the portions intersecting the upper chord 11 and the lower chord 12 to each lower side of the lattice 13 The bent portion 16 is welded to the iron plate 2 to constitute the structural material of the floor slab.
[0016]
In this way, when supporting steel bars 14a and 14b are installed so as to be along approximately one pitch of the end lattice 13 so that the structural material is bridged between the cross beams 3 and concrete is placed. It can withstand the shear stress acting on the cross beam 3.
[0017]
【The invention's effect】
As is clear from the description based on the embodiment described above, according to the structural material of the floor slab of the present invention, the end fixing member 10 has high rigidity, and the self-supporting truss 1 of the structural material is supported by the cross beam 3. At this time, since the load is supported by the two supporting reinforcing bars 14 and 14a welded to the end lattice 13, the load can be dispersed on the cross beam 3.
[Brief description of the drawings]
FIG. 1 is a front view (a) and side views (b) to (d) showing a structural material of a floor slab according to the present invention;
FIG. 2 is a front view (a) and side views (b) and (c) showing a structural material of a conventional floor slab.
[Explanation of symbols]
1 self-supporting truss 2 iron plate with groove shape 3 transverse beam
10 Fixing member
11 First quarter muscle
12 Lower chord
13 Lattice muscle
14, 14a Supporting rebar
15 Upper bend
16 Lower bend
17, 17a Lower end of supporting bar

Claims (2)

1本の上弦筋と2本の下弦筋を三角状に配置し、波状に屈曲させた2本のラチス筋の上側屈曲部を上記上弦筋に溶接し、各ラチス筋の下部に上記下弦筋をそれぞれ溶接して自立型トラスを形成し、該自立型トラスの端部における外下向きに開く斜めの端部ラチス筋に対して、支持用鉄筋を平行に添設して下端部を上弦筋および下弦筋と平行に曲げ、該支持用鉄筋を上記上弦筋および上記下弦筋に溶接して端部固定部材を形成し、上記ラチス筋の下側屈曲部を平行な複数の溝型を形成した鉄板に溶接したことを特徴とする床版の構造材。Arrange one upper chord and two lower chords in a triangular shape, weld the upper bent portion of the two lattices bent in a wave shape to the upper chord, and place the lower chord in the lower part of each lattice. A self-supporting truss is formed by welding to each other, and a supporting rebar is attached in parallel to the oblique end lattice that opens outward at the end of the self-supporting truss, and the lower end is connected to the upper and lower chords. Bend parallel to the muscle, weld the supporting reinforcing bar to the upper chord and lower chord to form an end fixing member, and form a plurality of parallel groove types on the lower bent portion of the lattice Floor slab structural material characterized by welding. 1本の上弦筋と2本の下弦筋を三角状に配置し、波状に屈曲させた2本のラチス筋の上側屈曲部を上記上弦筋に溶接し、各ラチス筋の下部に上記下弦筋をそれぞれ溶接して自立型トラスを形成し、該自立型トラスの端部における外下向きに開く斜めの端部ラチス筋の略1ピッチ分に対して、支持用鉄筋を平行に添設して下端部を上弦筋および下弦筋と平行に曲げ、上弦筋および下弦筋と交差する部分を溶接して端部固定部材を形成し、上記ラチス筋の下側屈曲部を平行な複数の溝型を形成した鉄板に溶接したことを特徴とする床版の構造材。Arrange one upper chord and two lower chords in a triangular shape, weld the upper bent portion of the two lattices bent in a wave shape to the upper chord, and place the lower chord in the lower part of each lattice. each welding to form a self-supporting truss, the free-standing relative to substantially one pitch of the oblique end lattice muscle that opens out downwards at the ends of the truss, the lower end portion and additionally provided in parallel to the supporting rebar Was bent in parallel with the upper and lower chords, the portions intersecting with the upper and lower chords were welded to form an end fixing member, and the lower bent portion of the lattice was formed into a plurality of parallel grooves A structural material for floor slabs that is welded to an iron plate.
JP2001401309A 2001-12-28 2001-12-28 Floor slab structural material Expired - Fee Related JP3684196B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
JP2001401309A JP3684196B2 (en) 2001-12-28 2001-12-28 Floor slab structural material

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JP3684196B2 true JP3684196B2 (en) 2005-08-17

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