JPH04237714A - Concrete reinforcing steel member - Google Patents
Concrete reinforcing steel memberInfo
- Publication number
- JPH04237714A JPH04237714A JP1602191A JP1602191A JPH04237714A JP H04237714 A JPH04237714 A JP H04237714A JP 1602191 A JP1602191 A JP 1602191A JP 1602191 A JP1602191 A JP 1602191A JP H04237714 A JPH04237714 A JP H04237714A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- box
- reinforcing bars
- joints
- steel sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910001294 Reinforcing steel Inorganic materials 0.000 title description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 93
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 73
- 239000010959 steel Substances 0.000 claims abstract description 73
- 239000000463 material Substances 0.000 claims description 25
- 230000035515 penetration Effects 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 6
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 10
- 238000009412 basement excavation Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 3
- 238000009435 building construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、土木、建築分野に用い
られるコンクリート用鉄筋材に関し、特に泥水固化方法
によって構築されるコンクリート構造物構築に適し、な
かでも連続地中壁に適したコンクリート用鉄筋材に係る
。[Industrial Field of Application] The present invention relates to reinforcing steel for concrete used in the civil engineering and construction fields, and is particularly suitable for constructing concrete structures constructed by the muddy water solidification method, and in particular for concrete suitable for continuous underground walls. Related to reinforcing bars.
【0002】0002
【従来の技術】周知のとおり、通常コンクリート構造物
に用いられる鉄筋材は、コンクリート用棒鋼を組み上げ
て網状もしくは籠形に形成したものが採用されており、
特に近時土木、建築分野における連続地中壁に代表され
るような大形のコンクリート構造物を築造する際には、
特開昭64−90314号公報に記載されているように
、あらかじめ所定の地盤に掘削した掘削溝の泥水(安定
液)中に、所望の形態に組み上げた籠形鉄筋を建て込み
泥水を固化するほか、モルタルやコンクリートをトレミ
ー管で挿入する手段が採用されている。[Prior Art] As is well known, the reinforcing bars used in concrete structures are usually made of concrete steel bars assembled into a net or cage shape.
Especially when constructing large concrete structures such as continuous underground walls in the recent civil engineering and architectural fields,
As described in Japanese Unexamined Patent Publication No. 64-90314, cage-shaped reinforcing bars assembled into a desired shape are erected in muddy water (stabilizing liquid) in an excavation trench previously excavated in a predetermined ground to solidify the muddy water. Another method used is to insert mortar or concrete using tremie pipes.
【0003】ところで、前記籠形鉄筋のうち大形のもの
を製作するには、広大な作業場と熟練した多数の技能者
が必要であり、さらに建て込みに際して、変形や歪を避
けるため大形の重機を用いて慎重な作業を行わなければ
ならないので,作業期間が長くなり、建設コストが高く
なるという課題があつた。そこで、本発明者は複数の鋼
矢板を継手嵌合し単位ブロックとした鉄筋材を製造し、
泥水掘削孔に前記単位ブロック鉄筋材を建て込む改善さ
れた手段を開発した。By the way, manufacturing large-sized cage-shaped reinforcing bars requires a vast workshop and a large number of skilled technicians, and furthermore, in order to avoid deformation and distortion during erection, large-sized cage reinforcing bars are manufactured. Since the work had to be carried out carefully using heavy machinery, there were problems in that the work period was long and construction costs were high. Therefore, the present inventor manufactured a reinforcing bar material by fitting a plurality of steel sheet piles into a unit block,
An improved means of erecting the unit block reinforcing bars in muddy boreholes has been developed.
【0004】0004
【発明が解決しようとする課題】さて、前述の連続地中
壁に代表される大形のコンクリート構造物は、近来ます
ます巨大化し、建て込み深度が50mから100mに近
いものが要求されるようになり、そこで構造的に丈夫で
、建て込みが容易であり、止水性に富み、かつ、価格の
安い鉄筋材に対する要望が非常に高くなった。しかしな
がら、前述のような棒鋼を用いた籠形鉄筋は深度が50
m以上に達する場合特に機械的強度の確保が困難になる
ほか、製造コストおよび建て込み費用が非常に高くなり
、また単に鋼矢板を継手嵌合しつつ連結固着して鉄筋材
を構成する場合は、深度が深くなるほど接続や継手嵌合
および姿勢保持が困難になり施工作業費が嵩むという課
題がある。[Problem to be Solved by the Invention] Large concrete structures, such as the continuous underground walls mentioned above, have recently become larger and larger, and are required to have a built-in depth of 50 m to nearly 100 m. As a result, there has been an extremely high demand for reinforcing bars that are structurally strong, easy to install, highly watertight, and inexpensive. However, cage reinforcing bars using steel bars as mentioned above have a depth of 50 mm.
If the thickness exceeds m, it becomes difficult to ensure mechanical strength, and manufacturing and erection costs become extremely high.Also, when constructing reinforcing bars by simply connecting and fixing steel sheet piles with joints, However, the problem is that the deeper the depth, the more difficult it becomes to connect, fit joints, and maintain the posture, which increases construction work costs.
【0005】本発明の目的は、機械的強度が高く、製作
にあたり熟練した技能の必要が無く、継手加工費が低廉
で、さらに建て込みが容易で、モルタルやコンクリート
の充填が円滑な鉄筋材を提供することにある。[0005] The object of the present invention is to provide a reinforcing bar material that has high mechanical strength, does not require skilled skills to manufacture, has low joint processing costs, is easy to install, and can be filled with mortar or concrete smoothly. It is about providing.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
本発明のコンクリ−ト用鉄筋材は、箱型鋼矢板複数個を
継手嵌合連結固着してなる鉄筋材であって、かつ下端根
入部が無継手に形成されているものである。箱型鋼矢板
は有孔ウエブのものを使用することができる。また、箱
型鋼矢板を縦方向に連結して使用することができる。[Means for Solving the Problems] In order to achieve the above object, the reinforcing bar material for concrete of the present invention is a reinforcing bar material made by fitting together and fixing a plurality of box-shaped steel sheet piles, and which has a lower end rooting portion. is formed without joints. The box-shaped steel sheet pile can be made of perforated web. Moreover, box-shaped steel sheet piles can be connected vertically and used.
【0007】[0007]
【作用】本発明のコンクリート用鉄筋材は、箱型鋼矢板
複数個を継手嵌合連結固着することを要件としてなる鉄
筋材であり、機械的強度が高く、組み立ては継手嵌合と
溶接固着もしくは継目板接続で済むため熟練作業が不必
要であり、かつ下端根入部が無継手に形成されているの
で、継手加工費が低廉で済み経済性が高い。また、コン
クリート用鉄筋材の素材として有孔ウエブ箱型鋼矢板を
用い該有孔ウエブ箱型鋼矢板複数個を継手嵌合連結固着
する場合は、前述のように機械的強度が大きいことと組
み立てが容易なことに加えて、ウエブが有孔であるため
コンクリートの充填が極めて円滑で、かつ下端根入部を
無継手に形成した場合は継手加工費が低廉で済み経済性
に有利である。[Operation] The reinforcing bar material for concrete of the present invention is a reinforcing bar material that requires multiple box-shaped steel sheet piles to be connected and fixed by fitting together with joints, and has high mechanical strength, and can be assembled by fitting together joints and fixing by welding or joints. Since the plate connection is sufficient, no skilled work is required, and since the lower end penetration part is formed without a joint, the joint processing cost is low, making it highly economical. In addition, when perforated web box-type steel sheet piles are used as the material for concrete reinforcing bars and multiple perforated web box-type steel sheet piles are connected and fixed with joints, they have high mechanical strength and are easy to assemble, as described above. In addition, since the web has holes, filling with concrete is extremely smooth, and if the lower end penetration part is formed without a joint, the joint processing cost is low, which is advantageous in economic efficiency.
【0008】つぎに、単位箱型鋼矢板複数個を継手嵌合
連結固着してなる単位鉄筋材を、さらに複数個縦連結し
てなる複合連結鉄筋材であって、かつ下端根入部が無継
手に形成されているコンクリート用鉄筋材の場合は、機
械的強度が極めて高く、50m以上の建て込みが必要な
鉄筋として充分に堅固で、寸法要求に対する裕度が大き
く、どのような巨大な鉄筋材の要求にも、性能を落とす
ことなく対応することが可能で、さらに組み立ては前述
の鉄筋材と同様に継手嵌合と溶接固着もしくは継目板接
続で済むため熟練作業が不必要である。さらに下端根入
部が無継手に形成されているので、継手加工費が低廉で
済み経済性が高い。[0008] Next, there is a composite connected reinforcing bar made by vertically connecting a plurality of unit reinforcing bars formed by connecting and fixing a plurality of unit box-shaped steel sheet piles with joints, and in which the lower end rooting part is without a joint. In the case of concrete reinforcing bars that have been formed, they have extremely high mechanical strength, are strong enough to be used as reinforcing bars that need to be built over 50 meters long, and have a large tolerance for dimensional requirements, and can be used for any gigantic reinforcing bars. It is possible to meet various demands without compromising performance, and as with the above-mentioned reinforcing bars, assembly can be accomplished by fitting joints and fixing by welding or connecting joint plates, so no skilled work is required. Furthermore, since the lower end penetration part is formed without a joint, the joint processing cost is low, making it highly economical.
【0009】さらに、単位有孔ウエブ箱型鋼矢板複数個
を継手嵌合連結固着してなる単位鉄筋材を、さらに複数
個縦連結してなる複合連結鉄筋材であって、かつ下端根
入部が無継手に形成されているコンクリート用鉄筋材を
用いる場合は、同様に機械的強度が極めて高く、大深度
の建て込みが必要な鉄筋として充分に堅固であり、寸法
要求に対する裕度が大きく、巨大な鉄筋材の要求にも、
性能を落とすことなく経済的に対応することが可能で、
さらに組み立ては前述の鉄筋材と同様に継手嵌合と溶接
固着もしくは継目板接続で済むため熟練作業が不必要で
あり、さらにウエブが有孔であるためモルタルやコンク
リートの充填が極めて円滑で、鋼材重量も少なくて済む
ほか、さらに下端根入部が無継手に形成されているので
、継手加工費が割安で済み非常に経済性に富む。[0009] Furthermore, there is a composite connected reinforcing bar formed by vertically connecting a plurality of unit reinforcing bars formed by connecting and fixing a plurality of unit perforated web box-type steel sheet piles with joints, and which has no lower end rooting part. When using concrete reinforcing bars formed in joints, they similarly have extremely high mechanical strength and are strong enough to be used as reinforcing bars that need to be built at great depths. In response to requests for reinforcing bars,
It is possible to respond economically without reducing performance,
Furthermore, as with the above-mentioned reinforcing bars, assembly can be done by fitting joints and fixing by welding or connecting joint plates, so no skilled work is required.Furthermore, since the web is perforated, filling with mortar or concrete is extremely smooth, and steel Not only does it weigh less, but since the lower end penetration part is formed without a joint, the joint processing cost is low, making it extremely economical.
【0010】0010
【実施例】以下本発明を実施例について、図面に従って
説明する。図1は本発明にかかるコンクリート用鉄筋材
1の概略斜視図で、該コンクリート用鉄筋材1は、有孔
ウエブI形鋼2に双腕継手3を溶接してなる単位箱型鋼
矢板4を6個継手嵌合連結固着し、単位鉄筋材として構
成している例を示すが、後に詳述するように前記コンク
リート用鉄筋材1の下端根入部5は無継手に形成されて
いる。つまり、換言すると下端根入部5の有孔ウエブI
形鋼2には双腕継手3を溶接せず、該有孔ウエブI形鋼
2の最下端部6には必要に応じて固着される間隔保定帯
板7が横設固着されている。また、単位箱型鋼矢板4相
互の連結固着は、本実施例では単位箱型鋼矢板4相互を
継手嵌合したのち、継手部を溶接する手段が採用されて
おり、符号8は溶接部を示す。さらに、連結固着は前記
溶接のほか継手部にコッターを嵌入する手段やフランジ
に穿孔した孔に有孔継目板を当接し一方向締めボルトを
用いて締結する手段および連結梁材を横設溶接するなど
の締結手段を採用することも可能であり、本発明におい
て単位箱型鋼矢板の継手嵌合連結固着とは前述の意味に
おいて用いる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. FIG. 1 is a schematic perspective view of a reinforcing bar material 1 for concrete according to the present invention. Although an example is shown in which individual joints are fitted, connected, and fixed to form a unit reinforcing bar, the lower end insertion portion 5 of the concrete reinforcing bar 1 is formed without a joint, as will be described in detail later. In other words, the perforated web I of the lower end insertion part 5
A double-arm joint 3 is not welded to the section steel 2, and a spacing band plate 7 is horizontally fixed to the lowermost end 6 of the perforated web I section 2, which is fixed as required. In addition, in this embodiment, the unit box-shaped steel sheet piles 4 are connected and fixed to each other by fitting the unit box-shaped steel sheet piles 4 together and then welding the joint part, and reference numeral 8 indicates the welded part. Furthermore, in addition to the above-mentioned welding, the connection can be fixed by means of fitting a cotter into the joint, means of abutting a perforated joint plate against a hole drilled in the flange and fastening it using a one-way tightening bolt, and horizontal welding of the connection beam material. It is also possible to employ fastening means such as the following, and in the present invention, the term "fitting, connecting and fixing joints of unit box-shaped steel sheet piles" is used in the above-mentioned meaning.
【0011】つぎに、図2は本発明の他の実施例にかか
るコンクリート用鉄筋材9の概略斜視図で、該コンクリ
ート用鉄筋材9は、有孔ウエブ角鋼管10に双腕継手1
1を溶接してなる単位箱型鋼矢板12を6個継手嵌合連
結固着し、単位鉄筋材として構成している例を示す。該
コンクリート用鉄筋材9も前記コンクリート用鉄筋材1
と同様に下端根入部13は無継手に形成されており、さ
らに該有孔ウエブ角鋼管10の下端部13には間隔保定
機能を備えた横設棒鋼14と構造強度を高める機能を備
えたトラス棒鋼材15が溶接固着されている。本発明に
かかるコンクリート用鉄筋材1および9は、前述のよう
に構造的に頑丈であり、しかも単位ブロックに形成され
ているので、図3に示すように前記コンクリート用鉄筋
材9をクレーンを用いて掘削孔16中に形態的な変形や
歪を懸念することなく一挙に建て込むことが出来るため
作業を安全にかつ極めて能率的に実施できる。また、主
要構成部材であるIまたはH形鋼もしくは角鋼管に本実
施例のように有孔ウエブを備えたものを使用する場合は
、無孔ウエブのものに比し泥水攪拌効率が良好で、コン
クリートやモルタルの回り込みも良く、打設能率が優れ
、充填密度も良好である。Next, FIG. 2 is a schematic perspective view of a reinforcing bar material 9 for concrete according to another embodiment of the present invention.
An example is shown in which six unit box-shaped steel sheet piles 12 made by welding 1 are connected and fixed through joints and configured as unit reinforcing bars. The reinforcing bar material 9 for concrete is also the reinforcing bar material 1 for concrete.
Similarly, the lower end penetration part 13 is formed without a joint, and furthermore, the lower end part 13 of the perforated web rectangular steel pipe 10 is equipped with a horizontal steel bar 14 having a spacing function and a truss having a function of increasing structural strength. A steel bar 15 is fixed by welding. The reinforcing bars 1 and 9 for concrete according to the present invention are structurally strong as described above and are formed into unit blocks, so as shown in FIG. Since the construction can be carried out at once in the excavated hole 16 without worrying about morphological deformation or distortion, the work can be carried out safely and extremely efficiently. In addition, when using I- or H-shaped steel or square steel pipes, which are the main structural members, with perforated webs as in this example, muddy water agitation efficiency is better than those with non-perforated webs. Good circulation of concrete and mortar, excellent placement efficiency, and good packing density.
【0012】つぎに、本発明に用いる主要部材の箱形鋼
矢板を実施例に従って詳細に説明する。図4は、I形鋼
17のフランジ18a〜18dに直線形鋼矢板の半截体
からなる継手19a〜19dを溶接してなる箱形鋼矢板
20の平面図で、図5は角鋼管21のブランジ22a、
22bに直線形鋼矢板の半截体からなる継手23a〜2
3dを溶接してなる箱形鋼矢板24の平面図である。ま
た、図6は前記箱形鋼矢板20を5個用い継手嵌合連結
固着して構成したコンクリート用鉄筋材25の概略平面
図である。本発明では、前記箱形鋼矢板20や箱形鋼矢
板24を用いるほか、角鋼管のフランジに棒鋼雄継手と
鋼管雌継手を溶着してなる周知の箱形鋼矢板などを利用
することが可能であるが、前記箱形鋼矢板20、24は
特に全強継手であるため構造的な強度が高く止水性も優
れているので、高い経済効果が期待出来る。さらに、図
7は継手の総てに鋼管雌継手26a〜26dを有する箱
形鋼矢板27で、コンクリート用鉄筋材相互の接続に利
用する。即ち図8に示すようにコンクリ−ト用鉄筋材2
5aを建て込み、そのあと後続のコンクリ−ト用鉄筋材
25bの建て込みにあたり前記箱形鋼矢板27を用いる
と継手の嵌合裕度が大きいので建て込みの寸法誤差の吸
収が容易になり、工事能率が非常に向上する。Next, a box-shaped steel sheet pile, which is a main member used in the present invention, will be explained in detail according to an embodiment. FIG. 4 is a plan view of a box-shaped steel sheet pile 20 formed by welding joints 19a to 19d made of half-cut straight steel sheet piles to the flanges 18a to 18d of the I-beam 17, and FIG. 22a,
22b is a joint 23a to 2 made of a half-cut straight steel sheet pile.
It is a top view of box-shaped steel sheet pile 24 formed by welding 3d. Moreover, FIG. 6 is a schematic plan view of a reinforcing bar material 25 for concrete constructed by using five box-shaped steel sheet piles 20 and connecting and fixing them with joints. In the present invention, in addition to using the box-shaped steel sheet pile 20 and the box-shaped steel sheet pile 24, it is also possible to use the well-known box-shaped steel sheet pile made by welding a male steel bar joint and a female steel pipe joint to the flange of a square steel pipe. However, since the box-shaped steel sheet piles 20 and 24 are all-strong joints, they have high structural strength and excellent water-stopping properties, so high economic effects can be expected. Furthermore, FIG. 7 shows a box-shaped steel sheet pile 27 having steel pipe female joints 26a to 26d in all of its joints, and is used for mutually connecting reinforcing bars for concrete. That is, as shown in FIG.
5a, and then use the box-shaped steel sheet piles 27 when erecting the subsequent concrete reinforcing bars 25b. Since the fit tolerance of the joint is large, it becomes easy to absorb dimensional errors in the erecting. Construction efficiency will be greatly improved.
【0013】つぎに、本発明にかかるコンクリート用鉄
筋材の下端根入部を無継手とする理由について詳細に説
明する。図9は、ビル建設において連続地中壁を構築す
るための地盤掘削状況を示す概略断面図であり、図9に
おいて28〜35はそれぞれ性状を異にする地層を示す
。周知のように連続地中壁を構築するには泥水掘削手段
により掘削孔36a、36bを堀り、コンクリート用鉄
筋材25c、25dを該掘削孔36a、36bに建て込
み、泥水固化を行ったのち土壌掘削を行い囲壁空間37
を構築し、ついで、底版コンクリート38を打設し側壁
施工を行うが、該側壁施工は説明を省略する。さて、前
記掘削孔36a、36bの掘削は、易透水性地層29、
31を貫きその先端39が難透水性もしくは不透水性の
支持地層35に達するまで実施する。この場合、従来の
技術では、大深度の連続地中壁に対する施工経験が薄い
ため、前記コンクリート用鉄筋材25c、25dについ
て、全長H即ち図9において(h1 +h2 =H)に
継手を取り付けたものが必須の要件として採用されてき
た。しかしながら、本発明者らの研究では特に大深度連
続地中壁用の鉄筋材として下端根入部について継手み不
必要で、下端根入部は主として垂直荷重を負担するのみ
で良いことが確認され、さらに下端根入部は泥水固化、
もしくはモルタルやコンクリート打設によって充分な耐
荷重性を有することが判った。つまり、図9においてコ
ンクリート用鉄筋材25c、25dの止水性は地表40
から前記底版コンクリート38の底部41までの深さh
1 相当分まで必要であり、底部41から掘削孔36a
、36bの先端39までの深さh2 相当分については
必要性が無いことが判った。即ち、従来懸念されていた
ように掘削によって地下水位が下がり易透水性地層29
、31から滲出した地下水が易透水性では無いが可透水
性の地層32、33、34から底部コンクリート38の
下部に集まり構築に不都合な湧水などを生ずる恐れはな
く、下端根入部の泥水固化やコンクリート打設によって
築造された連続地中壁下部はそのような地下水滲出を充
分阻止できることが判明した。本発明ではコンクリート
用鉄筋材25c、25dの前記深さh2相当分を下端根
入部と定義する。さて前記下端根入部については前述の
とおり施工条件つまり予定工事深度、地盤種別、止水条
件によつて絶対長さが相違し、一義的には定められず、
その都度の設計が必要であるが、本発明者らの研究では
下端根入部深さh2 は全長Hの10〜35%程度で有
る場合が多い。[0013] Next, the reason why the lower end penetration part of the reinforcing bar for concrete according to the present invention is made without a joint will be explained in detail. FIG. 9 is a schematic cross-sectional view showing the state of ground excavation for constructing a continuous underground wall in building construction, and in FIG. 9, 28 to 35 indicate strata having different properties. As is well known, in order to construct a continuous underground wall, drilling holes 36a and 36b are dug using muddy water drilling means, concrete reinforcing bars 25c and 25d are built into the drilling holes 36a and 36b, and the muddy water is solidified. Soil excavation was carried out to enclose wall space 37.
Then, the bottom slab concrete 38 is poured and the side walls are constructed, but the explanation of the side wall construction will be omitted. Now, the drilling of the boreholes 36a and 36b is carried out in the easily permeable stratum 29,
31 until the tip 39 reaches the supporting stratum 35 which is hardly permeable or impervious to water. In this case, since the conventional technology has little experience in constructing continuous underground walls at great depths, the joints are attached to the total length H of the concrete reinforcing bars 25c and 25d, that is, (h1 + h2 = H) in Fig. 9. has been adopted as an essential requirement. However, the research conducted by the present inventors has confirmed that joints are not necessary for the lower end of the reinforcing bar for deep continuous underground walls, and that the lower end of the reinforcing bar only needs to bear the vertical load. The bottom root root is solidified with muddy water.
Alternatively, it has been found that it has sufficient load bearing capacity when placed in mortar or concrete. In other words, in Fig. 9, the water-stopping properties of concrete reinforcing bars 25c and 25d are 40
Depth h from to the bottom 41 of the bottom slab concrete 38
1. The drilling hole 36a is required from the bottom 41.
, 36b to the tip 39 was found to be unnecessary. In other words, as was previously feared, excavation will lower the groundwater level and cause the formation of easily permeable strata29.
, 31 is not easily permeable, but it is not easily permeable, but there is no risk that the groundwater will gather at the lower part of the bottom concrete 38 from the permeable strata 32, 33, and 34 and cause spring water that is inconvenient for the construction, and the muddy water at the lower end rooting part will solidify. It has been found that the lower part of a continuous underground wall constructed by pouring concrete or pouring concrete can sufficiently prevent such seepage of groundwater. In the present invention, the portion equivalent to the depth h2 of the concrete reinforcing bars 25c and 25d is defined as the lower end penetration portion. As for the lower end penetration, as mentioned above, the absolute length differs depending on the construction conditions, that is, the planned construction depth, ground type, and water stoppage conditions, and cannot be determined unambiguously.
Although a design is required for each case, in research conducted by the present inventors, the lower end penetration depth h2 is often about 10 to 35% of the total length H.
【0014】本発明者は、コンクリート用鉄筋材建て込
みにあたり前記下端根入部の継手を無くし素材重量の減
少と継手加工費を軽減することにより、該コンクリート
用鉄筋材のコストを3〜8%低減することに成功した。
さて、前述のように50〜100mに達するような大深
度の連続地中壁を構築する場合、コンクリート用鉄筋材
も対応可能な長さのものが要求されるが現在の生産技術
手段では、構成部材としてのI形鋼やH形鋼および角鋼
管の長さに制限がある。そこで、大深度の連続地中壁用
鉄筋材に適した長尺のコンクリ−ト用鉄筋材42、43
を製作するには、図10、図11に示すように、単位有
孔ウエブ箱形鋼矢板複数個を継手嵌合連結固着してなる
単位鉄筋材44a、44bおよび45a、45bを縦連
結して製作するが、製作にあたっては、あらかじめ下端
が無継手の単位鉄筋材46、47を用い、全体として下
端根入部が無継手の長尺コンクリート用鉄筋材42、4
3を形成せしめることはいうまでも無い。前記長尺コン
クリート用鉄筋材42、43は単位有孔ウエブ箱形鋼矢
板を横方向および縦方向の二元方向に複合連結構成する
ものであり、従って本発明では前記長尺コンクリート用
鉄筋材42、43を以下複合連結鉄筋材という。また、
実施例では説明を省略したが、前記単位有孔ウエブ箱形
鋼矢板に代えて、無孔ウエブの箱形鋼矢板複数個を継手
嵌合連結固着してなる単位鉄筋材を、さらに複数個縦連
結して複合連結鉄筋材即ち長尺コンクリート用鉄筋材を
製作した例では、ウエブ加工費が無いため価格的には有
利であるが、コンクリート打設に際しトレミー管を用い
ての繰り返し打設作業が多くなるため、コンクリート打
設作業効率では前述のとおり有孔ウエブのものに比し若
干作業能率がひくい。[0014] The present inventor has reduced the cost of reinforcing bars for concrete by 3 to 8% by eliminating the joint at the lower end penetration part to reduce the weight of the material and the cost of processing the joints. succeeded in doing so. Now, as mentioned above, when constructing a continuous underground wall with a depth of 50 to 100 meters, concrete reinforcing bars must be long enough to handle the length, but current production technology means that There are limits to the length of I-beams, H-beams, and square steel pipes as members. Therefore, long concrete reinforcing bars 42 and 43 are suitable for continuous underground walls at great depths.
10 and 11, unit reinforcing bars 44a, 44b and 45a, 45b, which are made by fitting together and fixing a plurality of unit perforated web box-shaped steel sheet piles, are vertically connected. However, in manufacturing, unit reinforcing bars 46 and 47 whose lower ends have no joints are used in advance, and as a whole long concrete reinforcing bars 42 and 4 whose lower ends have no joints are constructed.
Needless to say, 3 is formed. The reinforcing bars 42 and 43 for long concrete are composed of unit perforated web box-shaped steel sheet piles connected in two directions, horizontal and vertical. Therefore, in the present invention, the reinforcing bars 42 and 43 for long concrete are , 43 are hereinafter referred to as composite connected reinforcing bars. Also,
Although the explanation was omitted in the example, instead of the unit perforated web box-shaped steel sheet piles, a plurality of unit reinforcing bars made by connecting and fixing a plurality of non-perforated web box-shaped steel sheet piles with joints were further added vertically. In the example of connecting composite connected reinforcing bars, that is, producing long concrete reinforcing bars, it is advantageous in terms of price because there is no web processing cost, but it requires repeated pouring work using tremie pipes when concrete is poured. As mentioned above, the concrete placement efficiency is slightly lower than that of perforated webs.
【0015】つぎに、本発明にかかるコンクリート用鉄
筋材は、前にも述べたように、なるべく一体物として長
尺のものを製作し使用するのが経済効果が高いが、現場
作業の制約条件つまり重量や寸法に制限がある場合には
作業現地において単位鉄筋材を逐次接続する必要が生じ
る。図12は、単位鉄筋材を逐次接続しつつ長尺コンク
リート用鉄筋材を建て込む状況を示す概略図で、超大形
クレーン48を用いて、長尺コンクリート用鉄筋材42
を建て込むにあたり、掘削孔49の上部地盤上に、長尺
コンクリート用鉄筋材42を掴み放し自在に掴持する装
置50を設け、該長尺コンクリート用鉄筋材42を一時
的に掴持するとともに建て込み位置を正確に保定して単
位鉄筋材の接続作業を実施する。また、長尺コンクリー
ト用鉄筋材42構成のため単位鉄筋材を逐次接続するに
あたり、図13、図14の部分概略断面図に示すように
、突合せ溶接51のほかフランジに穿設した孔に有孔継
目板52を当接し一方向締めボルト53を用いて締結す
る手段を採用すると接続作業を迅速に実施できる。図1
3、図14は、構成部材にハニカムH形鋼54を用いた
例であり、ウエブに貫通孔55を設ける手段として、H
形鋼ウエブに穿孔する手段より経済的で本発明のコンク
リート用鉄筋材に適している。[0015] Next, as mentioned above, it is economically effective to manufacture and use the reinforcing bars for concrete as long as possible in one piece, but there are constraints on site work. In other words, if there are restrictions on weight or dimensions, it will be necessary to connect unit reinforcing bars one after another at the work site. FIG. 12 is a schematic diagram showing the situation in which the reinforcing bars for long concrete are erected while sequentially connecting the unit reinforcing bars.
When constructing the concrete, a device 50 is installed on the ground above the excavation hole 49 to grip and release the long concrete reinforcing bars 42, and temporarily grip and hold the long concrete reinforcing bars 42. Connecting unit reinforcing bars is carried out while accurately maintaining the erection position. In addition, when sequentially connecting the unit reinforcing bars for the structure of the long concrete reinforcing bars 42, as shown in the partial schematic cross-sectional views of FIGS. By employing a means of abutting the joint plates 52 and fastening them using one-way tightening bolts 53, the connection work can be carried out quickly. Figure 1
3. FIG. 14 is an example in which a honeycomb H-shaped steel 54 is used as a component, and as a means for providing a through hole 55 in the web,
This method is more economical than the method of drilling holes in a section steel web, and is suitable for the reinforcing steel for concrete of the present invention.
【0016】[0016]
【発明の効果】本発明のコンクリート用鉄筋材は、主要
構成部材として箱形鋼矢板を用い、該箱形鋼矢板を継手
嵌合連結固着して構成するので、機械的強度が高く、製
作にあたり熟練した技能の必要が無く、また、下端根入
部が無継手であるため継手加工費が低廉で、極めて経済
的に製作ができる。さらに、単位ブロック体であるため
建て込みが容易で、形態的な変形や歪みが生じないため
熟練技能者の必要性が無く、作業能率が非常に良く、結
果としてコンクリート構造体建設費を大幅に低下させる
ことができる。さらに、単位鉄筋材を縦連結し長尺箱形
鋼矢板とした場合は、従来の鉄筋籠に比し、機械的強度
が高く、さらに建て込みが容易で、加えて単位有孔ウエ
ブ箱形鋼矢板を用いて製作した鉄筋材の場合は、モルタ
ルやコンクリートの充填が円滑で、品質的に信頼性の高
いコンクリート構造体が得られるなどの効果があり、特
に大深度のコンクリート構造体建設に適した鉄筋材とし
て実用効果は極めて大きい。[Effects of the Invention] The reinforcing steel for concrete of the present invention uses box-shaped steel sheet piles as the main component, and is constructed by connecting and fixing the box-shaped steel sheet piles with joints, so it has high mechanical strength and is easy to manufacture. There is no need for skilled skills, and since there is no joint at the lower end, the joint processing cost is low, making it extremely economical to manufacture. Furthermore, since it is a unit block structure, it is easy to build, and since there is no morphological deformation or distortion, there is no need for skilled technicians, and work efficiency is very high, resulting in a significant reduction in concrete structure construction costs. can be lowered. Furthermore, when unit reinforcing bars are connected vertically to form long box-shaped steel sheet piles, they have higher mechanical strength and are easier to erect than conventional reinforcing bar cages. In the case of reinforcing bars made using sheet piles, filling with mortar and concrete is smooth and a concrete structure with high reliability can be obtained, making it particularly suitable for constructing deep concrete structures. Its practical effects as a reinforcing bar material are extremely large.
【図1】本発明にかかるコンクリート用鉄筋材の概略斜
視図である。FIG. 1 is a schematic perspective view of a reinforcing steel material for concrete according to the present invention.
【図2】本発明にかかるコンクリート用鉄筋材の他の概
略斜視図である。FIG. 2 is another schematic perspective view of the reinforcing steel for concrete according to the present invention.
【図3】コンクリート用鉄筋材の建て込み状況を示す概
略平面図である。FIG. 3 is a schematic plan view showing how concrete reinforcing bars are installed.
【図4】構成部材の箱形鋼矢板の概略平面図である。FIG. 4 is a schematic plan view of a box-shaped steel sheet pile as a component.
【図5】構成部材の箱形鋼矢板の他の概略平面図である
。FIG. 5 is another schematic plan view of a box-shaped steel sheet pile as a component.
【図6】コンクリート用鉄筋材の概略平面図である。FIG. 6 is a schematic plan view of reinforcing steel for concrete.
【図7】継手の総てに鋼管雌継手を有する箱形鋼矢板の
概略平面図である。FIG. 7 is a schematic plan view of a box-shaped steel sheet pile having female steel pipe joints in all of its joints.
【図8】コンクリート用鉄筋材の建て込み状況を示す概
略説明図である。FIG. 8 is a schematic explanatory diagram showing the installation status of concrete reinforcing bars.
【図9】ビル建設において連続地中壁を構築するための
地盤掘削状況を示す概略断面図である。FIG. 9 is a schematic cross-sectional view showing the state of ground excavation for constructing a continuous underground wall in building construction.
【図10】本発明にかかる長尺のコンクリート用鉄筋材
の概略説明図である。FIG. 10 is a schematic explanatory diagram of a long reinforcing bar material for concrete according to the present invention.
【図11】本発明にかかる長尺のコンクリート用鉄筋材
の他の概略説明図である。FIG. 11 is another schematic explanatory diagram of the elongated reinforcing bar material for concrete according to the present invention.
【図12】コンクリート用鉄筋材の建て込み状況説明図
である。FIG. 12 is an explanatory diagram of the installation situation of reinforcing steel for concrete.
【図13】単位鉄筋材の接続状態を示す部分概略説明図
である。FIG. 13 is a partial schematic explanatory diagram showing a connection state of unit reinforcing bars.
【図14】単位鉄筋材の接続状態を示す他の部分概略説
明図である。FIG. 14 is another partial schematic explanatory diagram showing the connection state of unit reinforcing bars.
1 コンクリート用鉄筋材
2 有孔ウエブI形鋼
3 双腕継手
4 単位箱形鋼矢板
5 下端根入部
6 最下端部
7 間隔保定帯板
8 溶接部
9 コンクリート用鉄筋材
10 有孔ウエブ角鋼管
11 双腕継手
12 単位箱形鋼矢板
13 下端部
14 横設棒鋼
15 トラス棒鋼材
16 掘削孔
17 I形鋼
18a〜18d フランジ
19a〜19d 継手
20 箱形鋼矢板
21 角鋼管
22a、22b フランジ
23a〜23d 継手
24 箱形鋼矢板
25、25c、25d コンクリート用鉄筋材26a
〜26d 鋼管雌継手
27 箱形鋼矢板
28〜35 地層
36a、36b 掘削孔
37 囲壁空間
38 底版コンクリート
39 先端
40 地表
41 底部
42、43 コンクリート用鉄筋材
44a、44b 単位鉄筋材
45a、45b 単位鉄筋材
46、47 単位鉄筋材
48 超大形クレーン
49 掘削孔
50 掴持装置
51 突合せ溶接
52 有孔継目板
53 一方向締めボルト
54 ハニカムH形鋼
55 貫通孔1 Reinforcement material for concrete 2 Perforated web I-shaped steel 3 Double-arm joint 4 Unit box-shaped steel sheet pile 5 Lower end penetration part 6 Bottom end part 7 Spacing retaining strip 8 Welded part 9 Reinforcement material for concrete 10 Perforated web square steel pipe 11 Double-arm joint 12 Unit box-shaped steel sheet pile 13 Lower end 14 Horizontal steel bar 15 Truss steel bar 16 Drill hole 17 I-beam 18a-18d Flanges 19a-19d Joint 20 Box-shaped steel sheet pile 21 Square steel pipes 22a, 22b Flanges 23a-23d Joint 24 Box-shaped steel sheet piles 25, 25c, 25d Reinforcing bars for concrete 26a
~26d Female steel pipe joint 27 Box-shaped steel sheet piles 28-35 Geological strata 36a, 36b Excavation hole 37 Surrounding wall space 38 Bottom slab concrete 39 Tip 40 Ground surface 41 Bottom 42, 43 Concrete reinforcing bars 44a, 44b Unit reinforcing bars 45a, 45b Unit reinforcing bars 46, 47 Unit reinforcing bars 48 Super-large crane 49 Excavation hole 50 Gripping device 51 Butt welding 52 Perforated joint plate 53 One-way tightening bolt 54 Honeycomb H-shaped steel 55 Through hole
Claims (4)
してなる鉄筋材であって、かつ下端根入部が無継手に形
成されているコンクリート用鉄筋材。1. A reinforcing bar material for concrete, which is made up of a plurality of box-shaped steel sheet piles connected and fixed by fitting together with a joint, and whose lower end penetration portion is formed without a joint.
合連結固着してなる鉄筋材であって、かつ下端根入部が
無継手に形成されているコンクリート用鉄筋材。2. A reinforcing bar material for concrete, which is made by connecting and fixing a plurality of perforated web box-type steel sheet piles with joints, and in which the lower end rooting part is formed without a joint.
固着してなる単位鉄筋材を、さらに複数個縦連結してな
る複合連結鉄筋材であって、かつ下端根入部が無継手に
形成されているコンクリート用鉄筋材。[Claim 3] A composite connected reinforcing bar material made by longitudinally connecting a plurality of unit reinforcing bars formed by connecting and fixing a plurality of unit box-shaped steel sheet piles with joints, and in which the lower end penetration part is formed without a joint. Reinforcement material for concrete.
手嵌合連結固着してなる単位鉄筋材を、さらに複数個縦
連結してなる複合連結鉄筋材であって、かつ下端根入部
が無継手に形成されているコンクリート用鉄筋材。[Claim 4] A composite connected reinforcing bar material formed by vertically connecting a plurality of unit reinforcing bars formed by connecting and fixing a plurality of unit perforated web box-type steel sheet piles with joints, and having no lower end rooting part. Concrete reinforcing bars formed in joints.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1602191A JP2852566B2 (en) | 1991-01-14 | 1991-01-14 | Reinforcing bars for concrete |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1602191A JP2852566B2 (en) | 1991-01-14 | 1991-01-14 | Reinforcing bars for concrete |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH04237714A true JPH04237714A (en) | 1992-08-26 |
JP2852566B2 JP2852566B2 (en) | 1999-02-03 |
Family
ID=11904916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1602191A Expired - Fee Related JP2852566B2 (en) | 1991-01-14 | 1991-01-14 | Reinforcing bars for concrete |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2852566B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014114541A (en) * | 2012-12-06 | 2014-06-26 | Takenaka Komuten Co Ltd | Method for forming underground continuous wall |
CN104631434A (en) * | 2015-01-13 | 2015-05-20 | 金天德 | Box-shaped steel plate meshing continuous wall |
CN104631433A (en) * | 2015-01-13 | 2015-05-20 | 金天德 | Box-shaped steel plate meshing continuous wall structure system and construction technology |
CN104631435A (en) * | 2015-01-13 | 2015-05-20 | 金天德 | Meshing structure for box-shaped steel plate meshing continuous wall |
-
1991
- 1991-01-14 JP JP1602191A patent/JP2852566B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014114541A (en) * | 2012-12-06 | 2014-06-26 | Takenaka Komuten Co Ltd | Method for forming underground continuous wall |
CN104631434A (en) * | 2015-01-13 | 2015-05-20 | 金天德 | Box-shaped steel plate meshing continuous wall |
CN104631433A (en) * | 2015-01-13 | 2015-05-20 | 金天德 | Box-shaped steel plate meshing continuous wall structure system and construction technology |
CN104631435A (en) * | 2015-01-13 | 2015-05-20 | 金天德 | Meshing structure for box-shaped steel plate meshing continuous wall |
Also Published As
Publication number | Publication date |
---|---|
JP2852566B2 (en) | 1999-02-03 |
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