JPS6010063A - Construction of underground stair beam material - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は、地下階の梁材を構真柱に架設する地下階梁材
の架ね工法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for constructing underground floor beams on structural pillars.

従来、地下階の構築工法の１つとして逆打ち工法がある
。Conventionally, there is a reverse construction method as one of the construction methods for underground floors.

この工法は、建物の地上部と地下部とを平行して構築で
きる利点があるが、反面法のような欠点があった。This construction method has the advantage of being able to construct the above-ground and underground parts of a building in parallel, but it has the disadvantages of the lateral construction method.

（イ）　１階床を構築した後、地下階の構築作業はほぼ
密閉された地下作業となるため、作業性は悪く、特に地
下階を８ＲＣ造とした場合、地下階の鉄骨梁材は、１階
床の仮設開口部を通じてクレーン等で吊シ降ろし、横引
ｎ作業を行った後、所定の構真柱に固着しなければなら
ず、しかも地下階のスラブ、梁。柱の斧１築作業は煩雑
とならざるを得なかった。(b) After constructing the first floor, the construction work for the basement floor will be done underground in a nearly sealed area, so work efficiency is poor.Especially if the basement floor is made of 8RC construction, the steel beam materials for the basement floor will be After being lowered and lowered by a crane or the like through a temporary opening in the first floor, and then pulled horizontally, it must be fixed to the designated structural pillars, and also the slabs and beams on the basement floor. Building one pillar ax had to be complicated.

（ロ）階高のほぼ半分の位置（梁材よシｌ　Ａ４から１
、．５　Ｍの下部）に打継ぎ部ができるため１その部分
には流し込み部を有する複舵な型枠を必要とし、しかも
止水処理のために、熊収縮モルタルを注入しておシ、多
くの手間と時間を費やしていた。(b) Position approximately half of the floor height (beam material A4 to 1
,．． 5) Since a joint is formed at the bottom of the M, a double-rudder formwork with a pouring part is required for that part, and in order to stop the water, shrinkage mortar is injected, and a lot of work is required. It was a waste of time and effort.

このようなことから、従来の地下階の構築作業は工期の
短縮、工費の低減に大きな障害となっていた。For these reasons, conventional underground floor construction work has been a major obstacle to shortening the construction period and reducing construction costs.

本発明の目的は、地下階梁材を従来の逆打ち工法よりも
格段に簡単かつ能率的に架構でき、また地下階全体の柘
築工期の短縮化、工費の低減企図るとともに、施工階ス
ラブの上ＦＪと直上階スラブの下端との間を一度にコン
クリート打設することが可能な地下＠梁材の架構工法を
提供することにある。The purpose of the present invention is to make it possible to construct basement floor beams much more easily and efficiently than the conventional reverse construction method, to shorten the construction period for the entire basement floor, to reduce construction costs, and to To provide an underground @beam construction method that allows concrete to be placed between the upper FJ and the lower end of the floor slab immediately above at one time.

不発明は、梁材を下降案内するガイドレールが設けられ
た４ｂ真柱を用い、先ずこれを地中孔内に立設し、相対
向する内構真柱の地上突出部間に２階梁拐を架構固着し
て、内構真柱を所定の間隔に保持し、所要深さだけ掘削
作業を行りた後、全地下階の梁材及び１階梁材を、地上
において順次、下階のものよシ上記ガイドレールに沿っ
て下降させ、両構真柱間に固着すルコトなく順次段差的
に吊持又は仮固定する。The invention is to use a 4b main pillar provided with a guide rail to guide the beam downward, and first install this in an underground hole, and then install a second floor beam between the above-ground protruding parts of the opposing internal structure main pillars. After fixing the roof to the frame and maintaining the internal pillars at specified intervals, and excavating to the required depth, the beams of all the basement floors and the first floor beams were sequentially removed from the lower floor above ground. It is then lowered along the guide rail and suspended or temporarily fixed in stages without sticking between the two structural pillars.

次いで、掘削作業が進行した場所より、全地下階の梁材
及び１階梁材を同じくガイドレールに沿って下降させ、
構真柱間に固着することなく吊持又は仮固定して１階梁
狗を両横真柱にＩＮＪ着した後、上記と同様に、掘削作
業の進行とともに梁材の下降、梁材の吊持又は仮固定を
そ〃り返し、全地下階の梁材を上階のものより順次内構
真柱に固着し、最終的に地下階全体の躯体を構築する。Next, from the location where the excavation work has progressed, all the beams on the basement floor and the beams on the first floor are lowered along the same guide rail,
After installing the 1st floor beam dog on both horizontal pillars by suspending or temporarily fixing it between the structural pillars, as the excavation work progresses, lower the beam and suspend the beam. By reversing the holding or temporary fixing, the beams of all the basement floors are fixed to the interior pillars in sequence, starting with those of the upper floors, and finally the frame of the entire basement floor is constructed.

以下に本発明の一実施例を図面を参照して詳細に説明す
る。An embodiment of the present invention will be described in detail below with reference to the drawings.

第１図に示すように、不実施例は、山止め壁。As shown in FIG. 1, the non-embodiment is a retaining wall.

材１が土圧に耐えうる強度を有し、自立でさる場合、又
はアースアン刀−工法をｌｆηじ山止め支持材（特に切
梁）が不要な場合全想定した例で、次の（１）〜（４）
の順序で構真柱全立設するとともに２＠梁材を架構する
。If the material 1 has the strength to withstand earth pressure and is self-supporting, or if the earth anchor construction method does not require support materials (especially struts), the following (1) ~(4)
In this order, all the pillars of the structure will be erected and the beams will be constructed.

（１）、所定位置に掘削された所定深さの孔２・・・内
に所定長さの構真柱３を挿入して地上において仮固定治
具４によって仮固定し、この状態で各孔２内にコンクリ
ート５を打設して各構真柱３の下端部を固定する。(1) Insert a structural pillar 3 of a predetermined length into a hole 2 of a predetermined depth excavated at a predetermined location, temporarily fix it on the ground with a temporary fixing jig 4, and in this state, each hole Concrete 5 is placed inside the structure 2 to fix the lower end of each structural pillar 3.

なお、構真柱３として、本例では、第５図に示すように
角パイプ状柱材を用いているが、丸パイプ状柱材や十字
状柱材などを用いてもよい。In this example, a square pipe-shaped pillar material is used as the structural pillar 3, as shown in FIG. 5, but a round pipe-shaped pillar material, a cross-shaped pillar material, etc. may also be used.

構真柱３の各側面には、そのほぼ全長にそれぞれ２本の
ガイドレール６．６が平行に突設されている。On each side of the structure pillar 3, two guide rails 6.6 are provided extending in parallel over almost the entire length thereof.

（２）、相対向する両措真柱３，３の地上突出部間に、
第１．５．６図に示すように１対の２階梁材７，７を平
行に架構固着する。(2) Between the above-ground protruding parts of the two facing pillars 3 and 3,
As shown in Figure 1.5.6, a pair of second floor beams 7, 7 are fixed to the frame in parallel.

なお、このとさ、ガイドレール６．６の上端部に切欠部
ｅ、１．　ｅ、／を形成し、この切欠部６′。In addition, there is a notch e at the upper end of the guide rail 6.6. e, / is formed, and this notch 6'.

６′において２階梁材７，７の端縁を構真柱３の側面に
溶接して、両２階梁材７，７０間隔（内方寸法）をガイ
ドレール６．６の間隔とほぼ等しくしておくのが望まし
い。At 6', the edges of the second-story beams 7, 7 are welded to the side surfaces of the structural pillars 3, and the spacing (inner dimension) between the two second-story beams 7, 70 is approximately equal to the spacing between the guide rails 6.6. It is desirable to keep it.

また、２階梁材７，７をこのように構真柱３゜３に固着
することは、機能性（特に梁材の滑合作業時の容易性と
安全性確保のためのスラブ型枠兼用鋼製床板の設置）を
よくするためで、２階梁材には、みそ形鋼を用いるのが
最も望ましいが、■形鋼、Ｈ形鋼、Ｌ形鋼などの他の形
ｇ１であってもよい。In addition, fixing the second floor beams 7, 7 to the structural pillars 3゜3 in this way has functionality (in particular, it can be used as a slab formwork to ensure ease and safety when sliding the beams together). This is to improve the installation of steel floor plates), and it is most desirable to use miso section steel for the second floor beam material, but other shapes such as ■ section steel, H section steel, L section steel etc. Good too.

（３）、仮固定治具４・・・を取シ外す。(3) Remove the temporary fixing jig 4...

かくして、相対向する構真柱３，３の上端部は、２階梁
材７，７によって一定の間隔に保持されるもので、次に
第２図に示すように、地中梁材８、地下２階梁材９、地
下１階梁材１ｏ及び１階梁材１１を画描真柱３，３間に
位甑させ、１階梁材１１を次の（４）〜（７）の順次で
内構真柱３゜３に固着する。In this way, the upper ends of the structural pillars 3, 3 facing each other are held at a constant distance by the second floor beams 7, 7, and then, as shown in FIG. Place the beam material 9 on the second basement floor, the beam material 1o on the first basement floor, and the beam material 11 on the first floor between the drawing pillars 3 and 3, and place the beam material 11 on the first floor in the following order (4) to (7). It is fixed to the inner structure pillar 3゜3.

（４）、掘削作業を開始し、所定の深さまで掘削された
場所よシ、先ず地中梁材８の両端を、地上においてクレ
ーン１２等で吊持しながら、両２．１４真柱３．３のガ
イドレール６゜６に上端よシ清介させ、これらガイドレ
ール６．６に沿って下ＩＩ。(4) Start the excavation work, and at the place excavated to a predetermined depth, first, while suspending both ends of the underground beam material 8 on the ground with a crane 12 or the like, both 2.14 straight pillars 3. Pass the upper end through the guide rails 6.6 of 3, and lower II along these guide rails 6.6.

させて第６図に示すように１対の２階梁材７１７間を通
過させる。同様に、地下２階梁材９、地下１階梁材１０
．１階梁材１１を順次通過させ、これら４本の梁材８〜
１１を例えばチェーンブロック１３・・・のチェーン１
３′・・・によって２階梁材７の下方にすだれ状に吊持
しておく。Then, as shown in FIG. 6, it passes between a pair of second-story beam members 717. Similarly, the second basement floor beam material 9 and the first basement floor beam material 10
．． The first floor beams 11 are sequentially passed through, and these four beams 8~
For example, chain 1 of chain block 13...
3'... is suspended below the second floor beam 7 in the form of a blind.

（０）、掘削作業がさらに進行した後、最上部のチェー
ンブロック１３．１３を操作して１　階梁材１１をガイ
ドレール６．６に沿って所定の架構位置まで下降させる
。地下の梁材８〜１ｏは、１階梁材１１の下降にともな
−同じくガイドレール６．６に沿りて同時に下降する。(0) After the excavation work has further progressed, the uppermost chain block 13.13 is operated to lower the first floor beam 11 along the guide rail 6.6 to a predetermined frame position. The underground beams 8 to 1o simultaneously descend along the guide rails 6.6 as the first floor beams 11 descend.

（６）、、地中梁材８の両端部を仮受は治具１４，１４
によって面構真柱３，３の中途に仮固定する。(6), jigs 14, 14 are used to temporarily hold both ends of the underground beam material 8.
Temporarily fix it in the middle of the face structure true pillars 3, 3.

すなわち、第７回に示すように、仮受は治具１４をボル
ト１５を用いてガイドレール６．６に取り付けるととも
に、この仮受は治具１４上に地中梁桐８を乗載してボル
ト１６によって仮受ケ泊具１４に仮固定する。That is, as shown in Part 7, the temporary support is made by attaching the jig 14 to the guide rail 6.6 using bolts 15, and by mounting the underground beam paulownia 8 on the jig 14. It is temporarily fixed to the temporary support fixture 14 with bolts 16.

なお、地中梁材８を面構真柱３．３の中途に仮固定して
おくのは、上記のように既に架構固着した２階梁材７．
７と相俟って、架構中の画描真柱３，３相互の動きを拘
束し、面構真柱３゜３の中途部分での捩れやそシを防止
するためである。Note that the underground beams 8 are temporarily fixed in the middle of the face structure pillars 3.3 because the second floor beams 7.3 are already fixed to the frame as described above.
Together with 7, this is to restrain the mutual movement of the drawing true pillars 3, 3 in the frame, and to prevent twisting or deflection at the midway portion of the face structural true pillars 3°3.

（７）。１階梁材１１を所定の架構位置に位に灰めして
その両端を面構真柱３，３に溶接する。このとき、第８
図に示すように１階梁材１１のフランジ部分１１ａの両
側面とガイドレール６．６の内面とを溶接した後、構真
柱３の側面と１階梁材１１のフランジ部分１１ａの端［
ｆＩｊ及びウェブ部分１１ｂの端面とを溶接すれば、溶
接歪みによる構真柱３の捩れやそり１ｃ袷力低減するこ
とができる。(7). The first floor beam material 11 is laid down at a predetermined frame position and its both ends are welded to the face structure pillars 3, 3. At this time, the 8th
As shown in the figure, after welding both side surfaces of the flange portion 11a of the first floor beam material 11 and the inner surface of the guide rail 6.6,
By welding fIj and the end face of the web portion 11b, it is possible to reduce the twisting of the structural pillar 3 and the bending force of the warp 1c due to welding distortion.

なお、梁材８〜１１の挿入が終了した場ハ１よシ、２階
スラブコンクリ−ト１７を打設すれば、地上階の基準作
業床とすることができるので、地上階、地下階の・各動
線が分離でき、かつ地上階の構築作業を安全に行うこと
ができる。しかも、２階スラブ面での面剛性が向上でき
るため、オ、′６真柱３の最上部位置での保持をよ）正
確１強固なものとすることができる。In addition, if the insertion of beams 8 to 11 is completed, if the second floor slab concrete 17 is poured, it can be used as the standard working floor for the ground floor, so it is possible to・Each flow line can be separated, and construction work on the ground floor can be carried out safely. In addition, since the surface rigidity of the second floor slab surface can be improved, it is possible to accurately and firmly hold the true pillar 3 at the top position.

上記の通り１階梁材１１ｆｔ、架構固着した後、第３図
に示すように、１階梁材１１上に所定のスラブ用型枠（
−例として鋼製床板を想定した）を設置して１階スラブ
コンクリート１８を打設し、さらに掘削した後、梁材８
〜１０を下降させ、地中梁材８を上記と同様に仮固定し
て地下１階梁材１０を両檜真柱３，３に溶接する０次に
、地下１階梁材１０上に所定のスラブ用型枠を股装置し
て地下１階スラブコンクリート１９を打設する０地下２
階梁拐９については上記と同様の作業をｂつ。After the 11 ft. of first floor beams are fixed to the frame as described above, as shown in Fig. 3, the prescribed slab formwork (
- As an example, a steel floor plate is assumed), the first floor slab concrete 18 is poured, and after further excavation, the beam material 8
~ 10 is lowered, the underground beam material 8 is temporarily fixed in the same manner as above, and the first basement floor beam material 10 is welded to both cypress pillars 3, 3. Place slab concrete 19 for basement 1st floor using slab formwork.0 Basement 2
For the floor 9, perform the same work as above.

なお、スラブ用型枠を設値した後、スラブ用鉄筋を配置
し、コンクリートを打設すれば作業床（スラブ）が形成
できるため、スラブ用型枠と同時に梁用型枠及び性用型
枠を設置し、しかも支保工の下部は掘削面であった従来
の逆打ち工法に比べて、型枠組立作業は単純化さｒＬ１
工期の短縮が図れる。In addition, after setting the formwork for the slab, placing the reinforcing bars for the slab and pouring concrete can form the working floor (slab). The formwork assembly work is simplified compared to the conventional reverse casting method, in which the lower part of the shoring is an excavated surface.
Construction period can be shortened.

上記の通りスラブコンクリートを打設し、Ｐ）［定のコ
ンクリート強度に達したならば、２９４１Ｍ１に示すよ
うに、柱２０．梁２１．耐力壁２２の型枠を組み立て・
直上階のスラブのＦ９ｒ足位ｆｆｆｉに設けた貫通孔よ
シコンクリートを流し込み、札。Concrete slabs are poured as described above, and when the concrete strength reaches a certain level (P) [, as shown in 2941M1, column 20. Beam 21. Assemble the formwork for the load-bearing wall 22.
Pour the concrete into the through hole made at the F9r foot level fffi of the slab on the floor directly above, and install the sign.

梁、耐力壁のコンクリートを打設する０最下階では、地
中梁材８を面構真柱３，３に溶接した後、耐圧盤２３の
コンクリートを打設する。次に、柱２０．耐力壁２２．
梁２１．スラブ２４のコンクリートを打設する。Concrete is poured for the beams and load-bearing walls.0 On the lowest floor, after the underground beam material 8 is welded to the face structure pillars 3, 3, concrete for the pressure platen 23 is poured. Next, pillar 20. Load-bearing wall 22.
Beam 21. Pour concrete for slab 24.

柱、梁、耐力壁のコンクリート打設は、いずれも直上階
スラブに設けられた貫通孔よりコンクリートを流し込む
ことによって１１うので、コンクリート打設作業は極め
て簡単かつ安全であシ、シかも施工階スラブの上端から
直上Ｃ々スラブの下端の間に紘打継ぎ部がないため、止
水処理作業は非常に簡単である。Concrete pouring for columns, beams, and load-bearing walls is done by pouring concrete through through holes provided in the slab of the floor directly above, so concrete pouring work is extremely simple and safe. Since there is no joint between the upper end of the slab and the lower end of the C-slab directly above it, the water stop treatment work is very simple.

なお、上述した実施例は、構真柱３の各側面に設けた２
本のガイドレール１６．１６間に、梁材８〜１１の端部
な滑合させ、下降させる場合を想定したが、第９図に示
すように構真柱３の各側面に１本のガイドレール１６を
設けた場合には、梁材８〜１１の端部にスリット２５を
設け、このスリット２５をガイドレール１６に滑合させ
て梁材を下降させる。なお、この場合、梁材を構真柱３
に同着するには、第１０図に示すように梁材のウェブ部
１１ｂとガイドレール１６とを、連結板２６．２６によ
って挾持するとともにボルト接合し、梁ｔ、！’　８〜
１１のフランジ薄口」の端面と構真柱３の側面とを溶接
する。In addition, in the above-mentioned embodiment, two
It was assumed that the ends of the beams 8 to 11 were slid together and lowered between the main guide rails 16 and 16, but as shown in Fig. 9, one guide was installed on each side of the structural pillar 3. When the rails 16 are provided, slits 25 are provided at the ends of the beams 8 to 11, and the slits 25 are slid onto the guide rails 16 to lower the beams. In addition, in this case, the beam material is the structure pillar 3
To attach the beam t, !, the web portion 11b of the beam and the guide rail 16 are sandwiched between the connecting plates 26, 26 and bolted together as shown in FIG. 10, and the beam t,! '8～
The end face of the thin flange 11 and the side surface of the structural pillar 3 are welded.

本発明の効果を以下に列記する。The effects of the present invention are listed below.

■、　１階梁材及び全地下階の梁拐を面構真柱のガイド
レールに沿って下降させ、上階の梁材よシ順次、面構真
柱に架構［回着するので、梁側の架構作業は簡単かつ能
率的に行える。■. Lower the beams on the first floor and all the basement floors along the guide rails of the main pillars of the face structure, and sequentially move the beams from the upper floor to the main pillars of the face structure. The construction work can be done easily and efficiently.

■、梁梁側面構真柱に架構ｒｉ！ｉｆ着してその上にス
ラブ用型枠を設置し、スラブ用コンクリートを打設した
後、梁や柱の横築作業を行うｌこめ、スラブ用型枠と同
時に梁月型枠及び柱ｆｌｌ　截Ｖ’ｓ’を設置していた
従来の逆打ち工法に比べて、作業安全性は格段に優れ、
しめ１も鉄筋や型４へ？の組立て作業は通常の地上階で
の作業とｔｌ　Ｇｆ同様に簡単であシ、工期の短縮力・
図ｔＬる。■, Frame ri on the beam side structure true pillar! After the slab formwork is installed and the slab concrete is poured, horizontal construction work for beams and columns is carried out.The beam and column formwork and pillars are cut at the same time as the slab formwork. Compared to the conventional reverse construction method, which installed V's', work safety is much better,
Shime 1 also goes to rebar or type 4? The assembly work is as easy as normal ground floor work and tlGf, and it has the ability to shorten the construction period.
Figure tL.

■８　施工階スラブの上端と直上階スラブ゛の下ｙＩＭ
との間を一度にコンクリート打設できるのて、その間に
打継ぎ部はなく、またコンクリート打設作業は、スラブ
上面から行えるため、４Ｊ。■8 Upper end of construction floor slab and bottom yIM of floor slab directly above
Since concrete can be placed between the slab and the slab at once, there is no joint in between, and concrete can be poured from the top of the slab, so it is 4J.

めで安全である。しかも、スラブｅこ設けられた貫通孔
から俸状バイブレータが挿入でさるため、再振動限界範
囲内においてコンクリートに振動を与えれば、壁上端部
とヌラフ′下ｙｉ１４部との間に生じる隙間（乾燥収縮
によるもの）を極力小さくすることかでさ、密実なコン
クリートを形成することかできる。Happy and safe. Moreover, since the barrel-shaped vibrator is inserted through the through hole provided in the slab, if the concrete is vibrated within the re-vibration limit range, a gap (dry By minimizing shrinkage (due to shrinkage), it is possible to form dense concrete.

【図面の簡単な説明】[Brief explanation of the drawing]

第１〜４図は本発明の一実施例の架構１１ｉＬ４　Ｊシ
を示す説明図、第５．６図は構真柱と２階梁材の関係を
示す斜視図及び一部切欠き側面図、第７図は地中梁材の
仮固定状態を示す斜視図、第８図は１階梁材の固着状態
を示す水平断面図、第９．１０図は他の例を示し、第９
図はガイドレールと梁材の関係を示す水平断面図、第１
０図は楽劇の固着状態を示す水平断面図である０１６・
・・ガイドレール、３・・・構真柱、２・・・孔、７・
・・２階梁材、８・・・地中梁拐、９・・・地下２階梁
材、ｌＯ・・・地下１階梁材、１１・・・１諧梁材。 特許出願人　株式会社間　粗 代理人　弁理士　原　１）　信　市 第５図 オフ図 ３７１− ′Ａ７９図 第１０図1 to 4 are explanatory diagrams showing a frame 11iL4J according to an embodiment of the present invention, and FIG. 5.6 is a perspective view and a partially cutaway side view showing the relationship between the structure pillar and the second floor beam material, Fig. 7 is a perspective view showing the temporarily fixed state of underground beams, Fig. 8 is a horizontal sectional view showing the fixed state of first floor beams, Figs. 9 and 10 show other examples, and Fig. 9
The figure is a horizontal sectional view showing the relationship between the guide rail and the beam material.
Figure 0 is a horizontal sectional view showing the fixed state of the musical drama.
・・Guide rail, 3・・Structure pillar, 2・・Hole, 7・
... Beam material for the second floor, 8... Beam material for the underground 9. Beam material for the second basement floor, lO... Beam material for the first basement floor, 11... Beam material for the first floor. Patent Applicant Maza Co., Ltd. General Agent Patent Attorney Hara 1) Shin City Figure 5 Off Figure 371-'A79 Figure 10

Claims (1)

【特許請求の範囲】[Claims] ミ　ガイドレールが設けられた構真柱を地中孔内に立設
し、相対向する両横真柱の地上突出部に２階梁材を架構
固着し、両横真柱の間の地盤の掘削作業が進行した後、
全地下階の梁材及び１階梁桐を、順次、下階のものよυ
上記ガイドレールに滑合させるとともにそれに沿って下
降させ、両朽真柱間に固着することなく順次段差的に吊
持又は一部梁材の仮固定を行い、さらに掘削作業の進行
とともに、全地下階の梁材及び１階梁材を同じくガイド
レールに沿って下降させ、両ａ真柱間に固着することな
く吊持又は一部梁材の仮固定を行った後、滴定架４！Ｔ
位置に達した１階梁材を両横真柱に架構固着し、以下順
次、掘削作業、梁拐の下降、梁材の吊持又は一部梁材の
仮固定を繰り返し行うとともに、上階の梁材から順に所
定架構位置に固着することを％徴とする地下階梁材の架
構工法０(iii) A structural pillar equipped with a guide rail is erected in the underground hole, and second-story beams are fixed to the above-ground protruding parts of both opposing horizontal pillars, and the ground between the two horizontal pillars is fixed. After the excavation work progresses,
The beams on all the basement floors and the paulownia beams on the first floor were sequentially removed from those on the lower floors.
The beams are slid onto the guide rails and lowered along them, and the beams are suspended step by step without sticking between the two pillars, or some of the beams are temporarily fixed, and as the excavation work progresses, the entire underground After lowering the floor beams and the first floor beams along the guide rails, suspending them or temporarily fixing some of the beams between the two straight pillars, the titration rack 4! T
The beams on the first floor that have reached the position are fixed to the frame on both horizontal pillars, and then excavation work, lowering of the beams, suspension of the beams, and temporary fixing of some beams are repeated. Frame construction method for underground floor beam materials 0, which is characterized by fixing the beam materials in the specified frame positions in order