JPS5830988B2 - How to reinforce existing reinforced concrete floor slabs - Google Patents
How to reinforce existing reinforced concrete floor slabsInfo
- Publication number
- JPS5830988B2 JPS5830988B2 JP54029085A JP2908579A JPS5830988B2 JP S5830988 B2 JPS5830988 B2 JP S5830988B2 JP 54029085 A JP54029085 A JP 54029085A JP 2908579 A JP2908579 A JP 2908579A JP S5830988 B2 JPS5830988 B2 JP S5830988B2
- Authority
- JP
- Japan
- Prior art keywords
- slab
- deck plate
- reinforced concrete
- mortar
- lifting
- 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.)
- Expired
Links
Landscapes
- Working Measures On Existing Buildindgs (AREA)
Description
【発明の詳細な説明】
この発明は鉄筋コンクリートの老化現象などによって、
強度上の障害を生じた既存床スラブの補強方法に関する
。[Detailed Description of the Invention] This invention is based on the aging phenomenon of reinforced concrete.
This paper relates to a method for reinforcing existing floor slabs that have suffered from strength problems.
一般的なコンクリートは、打設後にその含有水分が蒸発
するなどの理由によって次第に収縮する経年変化があり
、この収縮作用によって表面に亀裂が生じたり、衝撃や
過荷重が原因となって大たわみやきれつが生じたりする
現象がある。General concrete gradually shrinks over time after it is poured due to reasons such as evaporation of the water contained in it, and this shrinkage can cause cracks on the surface and large deflections due to impact or overload. There is a phenomenon where cracks occur.
既存の鉄筋コンクリート床スラブの場合は、周囲が支持
されたいわゆる吊り構造をなしており、亀裂やたわみな
どの老化現象が生じてくると、中央部分などが破壊して
抜けてしまうなどの事故が発生する虞れがある。In the case of existing reinforced concrete floor slabs, they have a so-called suspended structure with support around the periphery, and when aging phenomena such as cracks and sag occur, accidents such as the central part breaking and falling out can occur. There is a possibility that
この発明は上記事情に鑑みてなされたもので、その目的
とするところは、スラブの下面または上下面を一様に補
強し得て強度回復が容易であり、スラブの形状に制約が
少なく規格化された材料の組み合わせで施工し得てコス
トメリットがあり、工期も短かくし得る方法を提供する
ことにある。This invention was made in view of the above circumstances, and its purpose is to uniformly reinforce the lower surface or upper and lower surfaces of the slab so that strength recovery is easy, and there are fewer restrictions on the shape of the slab and it can be standardized. The object of the present invention is to provide a method that can be constructed using a combination of materials that have a cost advantage and can shorten the construction period.
以下、この発明を図面に示す一実施例に基いて詳細に説
明する。Hereinafter, this invention will be explained in detail based on an embodiment shown in the drawings.
第１図はこの発明を適用した施工例の床断面図、第２図
は工程順に示した説明図であり、図中符号１で示すもの
は既存の補強対象スラブ、２は既存の仕上モルタル層、
３は既存のはりである。Fig. 1 is a floor cross-sectional view of a construction example to which the present invention is applied, and Fig. 2 is an explanatory diagram showing the order of the steps. ,
3 is an existing beam.
この補強対象スラブ１は、上述のように亀裂またはたわ
みなどが生じて、補強を必要とする程度に剛性や耐力が
低下し老化しているものとすれば、その程度に応じて次
の手段により補強がなされる。Assuming that the slab 1 to be reinforced has cracked or bent as described above and has deteriorated in rigidity and yield strength to the extent that it requires reinforcement, the slab 1 to be reinforced can be Reinforcement is provided.
第２図ａに示すように、補強対象スラブ１（以下単にス
ラブ１という）の下階の床４上に、スラブ１の下面形状
と同一平面形状のデツキプレート５を敷き並べ、このデ
ツキプレート５の上にワイヤメツジュロなどを載置する
。As shown in FIG. 2a, deck plates 5 having the same planar shape as the lower surface of the slab 1 are laid out on the floor 4 of the lower floor of the slab 1 to be reinforced (hereinafter simply referred to as slab 1). Place a piece of wire, etc. on top of it.
この時、骨材を敷並べておいてもよい。At this time, aggregate may be laid out.
一方、上記スラブ１に上下に貫通する複数個の吊上孔７
、固定孔８、注入孔９などをそれぞれ形成する。On the other hand, a plurality of lifting holes 7 vertically penetrate through the slab 1.
, a fixing hole 8, an injection hole 9, etc. are formed respectively.
これらの各社８，８，９は、予め形成しておいても、必
要性が生じた都度形成してもよい。These companies 8, 8, and 9 may be formed in advance or may be formed each time the need arises.
また、上記スラブ１の吊上孔７の近傍に適宜のウィンチ
１０などを設け、ワイヤ１１を吊上孔７に挿通させて下
階に垂らし、上記デツキプレート５を仮受は材１２を介
して吊り上げる。In addition, a suitable winch 10 or the like is provided near the lifting hole 7 of the slab 1, and a wire 11 is inserted through the lifting hole 7 and hangs down to the lower floor, and the deck plate 5 is temporarily supported through the material 12. lift.
この仮受け材１２は枠状などとして予めデツキプレート
５の下側に配置しておいてもよい。This temporary support material 12 may be arranged in advance under the deck plate 5 in the form of a frame or the like.
デツキプレート５などがスラブ１の下側の所定位置（即
ち補強層の厚さにより調整される）に達したら、適当な
ピッチで形成されたスラブ１の固定孔８から、あるいは
デッキプレート５下面からコンクリートドリルなどで、
デツキプレート５に孔をあけ、上記モルタル層２、スラ
ブ１、デツキプレート５を貫通して設けられた一連の孔
に通し、ボルト１３を挿入し、この通しボルト１３によ
りスラブ１にデツキプレート５を仮固定する。When the deck plate 5 etc. reaches a predetermined position on the underside of the slab 1 (that is, adjusted by the thickness of the reinforcing layer), it is inserted through the fixing holes 8 of the slab 1 formed at an appropriate pitch or from the underside of the deck plate 5. Concrete drill etc.
Holes are made in the deck plate 5, and bolts 13 are inserted through the series of holes provided through the mortar layer 2, the slab 1, and the deck plate 5, and the deck plate 5 is attached to the slab 1 using the through bolts 13. Temporarily fix.
通しボルト１３の数は太さなどによって異なるが、例え
ばφ１６ボルトで２〜３本／ｄとする。The number of through bolts 13 varies depending on the thickness, etc., but for example, 2 to 3 φ16 bolts/d.
さらにデツキプレート５の周縁部は、アングル材などを
介してホールインアンカ１５などにより上記はり３の側
面に取り付けられる（第１図、第２図す参照）。Further, the peripheral edge of the deck plate 5 is attached to the side surface of the beam 3 using a hole-in anchor 15 or the like via an angle member or the like (see FIGS. 1 and 2).
次いで、上記スラブ１の注入孔９から膨張性のモルタル
１６を、スラブ１の下面と上記デツキプレート５の上面
との間の空隙部１７に注入し固化させる（第２図Ｃ参照
）。Next, expandable mortar 16 is injected into the gap 17 between the bottom surface of the slab 1 and the top surface of the deck plate 5 through the injection hole 9 of the slab 1 and solidified (see FIG. 2C).
このモルタル１６の注入の際の空気抜きは、上記固定孔
８と通しボルト１３との間の隙間より行われ、また、こ
の際にスラブ１の下面の吸水性が問題となる場合は、予
め適宜プライマー処理を施しておけばよい。When pouring the mortar 16, air is vented through the gap between the fixing hole 8 and the through bolt 13. If the water absorption of the lower surface of the slab 1 is a problem at this time, use an appropriate primer in advance. All you have to do is process it.
また、スラブ１の亀裂が著しい場合は、その程度に応じ
てエポキシ樹脂を注入し、亀裂部分の補強が行われる。Further, if the slab 1 has significant cracks, epoxy resin is injected depending on the degree of cracking to reinforce the cracked portion.
次いで、上記モルタル１６が完全に固化し、所要の強度
発生後に通しボルト１３を締め直しくこの際に必要に応
じてプレストレスを加えてもよいＤ上記ウィンチ１０に
よりワイヤ１１を緩めて、上記仮受は材１２およびワイ
ヤ１１を撤去する。Next, after the mortar 16 has completely solidified and the required strength has been generated, the through bolts 13 may be tightened again, and at this time, prestress may be applied if necessary.D The wire 11 is loosened by the winch 10, and the wire 11 The material 12 and wire 11 are removed from the receiver.
次いで、上記仕上モルタル層２の各社７，８゜９などの
駄目づめ仕上げをして一連の作業が完了する（第２図Ｃ
参照）。Next, the finishing mortar layer 2 is filled with holes 7, 8, 9, etc., and the series of operations is completed (Fig. 2 C).
reference).
なお、この際にモノリシック仕上床である場合は、通し
ボルト１３の定着位置をコンクリート内へ下げてボルト
１３の頭などが隠れるようにするとよい。At this time, if the floor is a monolithic finished floor, it is preferable to lower the anchoring position of the through bolt 13 into the concrete so that the head of the bolt 13 is hidden.
一方、第３図は、スラブ１が亀裂、たわみなどにより変
形し、仕上モルタル層２の上面も、鎖線で示すように凹
みが生じている場合の施工例を示すものであり、スラブ
１の下側空隙に注入されるモルタル１６の厚みは、スラ
ブ１の変形程度に対応してデツキプレート５の下面が水
平状となるよつ昏こ雨上され、力）つ１士上七ルクル１
曽Ｚ（／、Ｊよにツ１ヤメッシュ６を介して適宜モルタ
ルが打設され、水平状の床面２′が形成されるものであ
る。On the other hand, Fig. 3 shows a construction example in which the slab 1 is deformed due to cracks, bending, etc., and the upper surface of the finishing mortar layer 2 is also dented as shown by the chain line. The thickness of the mortar 16 injected into the side gap is adjusted so that the lower surface of the deck plate 5 becomes horizontal, corresponding to the degree of deformation of the slab 1.
Mortar is placed as appropriate through the glossy mesh 6 to form a horizontal floor surface 2'.
この場合、通しボルト１３は、予め長めにセットしてお
いて、両モルタルの硬化後に締め直すものとする。In this case, the through bolts 13 are set longer in advance and retightened after both mortars have hardened.
なお、この発明の補強方法についてさらに詳述すると、
この発明はスラブ１の下面または上下面を一様に補強す
るもので、スラブ１周辺のはり３に荷重を支持させるも
のではなく、はり３に取り付けられるアングル材１４に
、デツキプレート５などの「かた」を吸収させ、かつモ
ルタル１６の漏洩を防止させるものである。In addition, to explain in more detail the reinforcing method of this invention,
This invention uniformly reinforces the lower surface or upper and lower surfaces of the slab 1, and does not require the beams 3 around the slab 1 to support the load. This prevents the mortar 16 from leaking.
そして、この補強方法で施工することによって、当初の
スラブ１などの全体厚さが補強層だけ増加し、かつ重量
も増加するが、通常の場合、はり３近傍のスラブ１の剪
断耐力には余裕があり、かつ全面一様な分布とすること
によって剛性が均一となり既存の配筋に応力負担を掛け
ることは稀である。By using this reinforcing method, the overall thickness of the original slab 1 etc. increases by the amount of the reinforcing layer, and the weight also increases, but in normal cases, the shear strength of the slab 1 near the beam 3 has some margin. By having a uniform distribution over the entire surface, the stiffness is uniform, and it is rare that stress is applied to the existing reinforcement.
ただし、ホテル、事務所などの床などで、床の強度が当
初から弱く設定されている場合は、自重増に対応した床
の積載荷重低減を考慮する必要がある。However, if the strength of the floor is set to be low from the beginning, such as in hotels, offices, etc., it is necessary to consider reducing the carrying load of the floor to accommodate the increased dead weight.
以上、詳述したようにこの発明は、鉄筋コンクノートの
老化現象などによって強度上の障害が既存床スラブに生
じた場合、スラブの下面または上下面を一様に補強して
強度回復をさせるものであるから、補強対象スラブの形
状に制限されることがなく、規格化された既成品のデツ
キプレート、ワイヤメツシュなどを組み合わせて使用で
き、モルタル注入時の仮枠の作用と耐力補強とをデツキ
プレートで兼ねさせ、デツキプレートなどを通しボルト
で支持させることができ、スラブ下面を粗加工したり、
亀裂、割れなどの部分にエポキシ樹脂を注入するなどの
作業を最小限にしてモルタルを注入し得てコスト上のメ
リットが大きく、また、作業空間が少なくてよく、部材
の吊り上げ作業が容易であり、スラブなどの破損による
破片の落下を防止できるなどの効果がある。As detailed above, this invention is a method for uniformly reinforcing the lower surface or upper and lower surfaces of the slab to restore strength when a strength problem occurs in the existing floor slab due to the aging phenomenon of reinforced concrete slabs. Therefore, it is not limited by the shape of the slab to be reinforced, and can be used in combination with standardized ready-made deck plates, wire mesh, etc., and the effect of the temporary frame and load-bearing reinforcement during mortar injection can be combined with the deck plate. It can also be used to support a deck plate etc. with bolts through it, and can be used for rough machining of the bottom surface of the slab.
It is possible to inject mortar with minimal work such as injecting epoxy resin into cracks and cracks, which has a great cost advantage.It also requires less work space and makes it easier to lift parts. This has the effect of preventing debris from falling due to damage to slabs, etc.
図面はこの発明を適用した実施例を示すもので、第１図
は要部の縦断面図、第２図ａ −ｄは施工手順の説明図
、第３図は変形が著しい補強対象スラブの施工を説明す
る要部の縦断面図である。
１・・・・・・補強対象スラブ、５・・・・・・デツキ
プレート、６・・・・・・ワイヤメツシュ ７・・・・
・・吊上孔、８・・・・・・固定孔、９・・・・・・注
入孔、１１・・・・・・ワイヤ、１３・・・・・・通し
ボルト、
１６・・・・・・モルタル、
１７・・・・・・空隙部。The drawings show an embodiment to which the present invention is applied. Fig. 1 is a longitudinal cross-sectional view of the main part, Fig. 2 a - d is an explanatory diagram of the construction procedure, and Fig. 3 shows the construction of a significantly deformed slab to be reinforced. FIG. 1...Slab to be reinforced, 5...Deck plate, 6...Wire mesh 7...
...Hoisting hole, 8...Fixing hole, 9...Injection hole, 11...Wire, 13...Through bolt, 16... ...Mortar, 17...Void.
Claims (1)
注入孔を形成し、上記スラブの下方にワイヤメツシュを
載置したデツキプレートを配置し、次いで上記吊上孔に
通したワイヤにより上記デツキプレートを吊り上げて、
上記スラブの下側に配置するとともに、上記デツキプレ
ートを上記固定孔に挿入した通しボルトで上記スラブに
仮固定し、次いで上記スラブ、デツキプレート間の空隙
部に上記注入孔よりモルタルを注入し、このモルタル固
化後に上記吊上ワイヤを外しかつ上記通しボルトで上記
スラブに上記デツキプレートを固定することを特徴とす
る既存鉄筋コンクリート床スラブの補強方法。1 Lifting holes and fixing holes that penetrate vertically through the slab to be reinforced,
forming an injection hole, arranging a deck plate with a wire mesh placed below the slab, then lifting the deck plate with a wire passed through the lifting hole,
Placed on the lower side of the slab, the deck plate is temporarily fixed to the slab with a through bolt inserted into the fixing hole, and then mortar is injected into the gap between the slab and the deck plate through the injection hole, A method for reinforcing an existing reinforced concrete floor slab, which comprises removing the lifting wire after the mortar hardens and fixing the deck plate to the slab using the through bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54029085A JPS5830988B2 (en) | 1979-03-13 | 1979-03-13 | How to reinforce existing reinforced concrete floor slabs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54029085A JPS5830988B2 (en) | 1979-03-13 | 1979-03-13 | How to reinforce existing reinforced concrete floor slabs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55122970A JPS55122970A (en) | 1980-09-22 |
| JPS5830988B2 true JPS5830988B2 (en) | 1983-07-02 |
Family
ID=12266502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54029085A Expired JPS5830988B2 (en) | 1979-03-13 | 1979-03-13 | How to reinforce existing reinforced concrete floor slabs |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5830988B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60263360A (en) * | 1984-06-11 | 1985-12-26 | Akai Electric Co Ltd | Magnetic video recording and reproducing device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012229534A (en) * | 2011-04-25 | 2012-11-22 | Railway Technical Research Institute | Construction method and structure for reinforcing viaduct slab using channel steel and deck plate |
| JP2012229533A (en) * | 2011-04-25 | 2012-11-22 | Railway Technical Research Institute | Construction method and structure for reinforcing viaduct slab using h-shaped steel and deck plate |
| JP5958907B2 (en) * | 2012-10-22 | 2016-08-02 | 西日本高速道路株式会社 | Partial restoration method for existing concrete slabs |
| EP3279408A1 (en) * | 2016-08-05 | 2018-02-07 | Sicurtecto S.r.l. | Method for the reinforcement of ribbed floors with a division slab made of cast concrete and floor thus reinforced |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52109720A (en) * | 1976-03-10 | 1977-09-14 | Shiyoobondo Kk | Method of reinforcing reinforced concrete floor board |
-
1979
- 1979-03-13 JP JP54029085A patent/JPS5830988B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52109720A (en) * | 1976-03-10 | 1977-09-14 | Shiyoobondo Kk | Method of reinforcing reinforced concrete floor board |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60263360A (en) * | 1984-06-11 | 1985-12-26 | Akai Electric Co Ltd | Magnetic video recording and reproducing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55122970A (en) | 1980-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2724261A (en) | Precast column attaching means | |
| CN108005387B (en) | Synchronous construction method for cast-in-place main body of assembled wallboard and short-limb shear wall | |
| US2360285A (en) | Arched construction and method for erecting same | |
| KR100635137B1 (en) | Bridge slab construction method and lattice bar deck-shaped precast concrete plate applied therein | |
| CN105256995B (en) | A kind of shear wall structure movement joint inner side template bracing means and construction method | |
| KR20060041078A (en) | Continuous steel bridge having precast concrete slab and construction method thereof | |
| JPS5830988B2 (en) | How to reinforce existing reinforced concrete floor slabs | |
| CN109610338B (en) | Construction method for preventing slurry leakage at bottom opening of tower column of suspension bridge | |
| JPS6282147A (en) | Novel prestressed synthetic beam and its construction | |
| CN212388856U (en) | Cast-in-place clear water concrete batter post structure of prestressing force | |
| JP2812178B2 (en) | Bridge pier construction method by self-elevating formwork method | |
| JPH06228915A (en) | Strut of elevated bridge, etc., and construction method thereof | |
| JPH11158813A (en) | Concrete pier constructing method | |
| JPH0426483Y2 (en) | ||
| JP2020186516A (en) | Method of constructing bridge railing | |
| KR102585728B1 (en) | Prestressed precast module with integrated girder and column and construction method using the same | |
| JPH02311639A (en) | Construction of composite floor | |
| JPS60181452A (en) | Construction of floor panel | |
| JP3008040B2 (en) | Large span composite slab erection method | |
| JP3171676B2 (en) | Construction method of cast-in-place concrete horizontal member | |
| JPS62170641A (en) | Concrete slab | |
| JPH0754049B2 (en) | Method of manufacturing precast PC structure | |
| JPS63118206A (en) | Manufacture of pc block by production at site | |
| JPH08333835A (en) | Base plate for concrete slab having deformed steel material as truss bar | |
| JPS626061B2 (en) |