JPH1077795A - Early dismantling method of formwork timbering - Google Patents

Early dismantling method of formwork timbering

Info

Publication number
JPH1077795A
JPH1077795A JP8251015A JP25101596A JPH1077795A JP H1077795 A JPH1077795 A JP H1077795A JP 8251015 A JP8251015 A JP 8251015A JP 25101596 A JP25101596 A JP 25101596A JP H1077795 A JPH1077795 A JP H1077795A
Authority
JP
Japan
Prior art keywords
concrete
curing
mortar
timbering
formwork
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.)
Pending
Application number
JP8251015A
Other languages
Japanese (ja)
Inventor
Kuniaki Kataoka
邦昭 片岡
Katsumi Koto
克己 古東
Yukio Yoshitomi
幸雄 吉富
Masanobu Sakamoto
全布 坂本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taisei Corp
Original Assignee
Taisei Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Taisei Corp filed Critical Taisei Corp
Priority to JP8251015A priority Critical patent/JPH1077795A/en
Publication of JPH1077795A publication Critical patent/JPH1077795A/en
Pending legal-status Critical Current

Links

Landscapes

  • Lining And Supports For Tunnels (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

PROBLEM TO BE SOLVED: To dismantle timbering within a specified curing time by holding curing temperature and curing humidity over specified %, when a half PC slab is used as a formwork so as to place concrete, mortar, or the like. SOLUTION: When existing concrete 1 of a road tunnel is superannuated, a PC slab 2 is provided as a formwork inside it through a fixed space, and the position is insured by a timbering 3. Heat insulating sheets 4 are provided on both end parts, heating humidifiers 5 are provided therein, concrete or mortar 6 is placed between the existing concrete 1 and the half PC slab 2, and by holding curing temperature over 40 deg. and curing humidity over 80%, early- strength is revealed within the curing time of six hours so as to enable the timbering 3 to be dismantled in an early stage. The half PC slab 2 is unnecessary to be dismantled, and it functions as the structural member of concrete or mortar 6 as it is. Consequently, the timbering 3 can be dismantled in an early stage, without using hardening accelerator, super high early-strength cement, or the like.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、コンクリート、モ
ルタルで構造物を施工し、あるいは製品を製作する場合
の、型枠支保工の早期解体方法に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an early dismantling method of a formwork support when a structure is constructed with concrete or mortar or a product is manufactured.

【0002】[0002]

【従来の技術】コンクリート、モルタルで構造物を施工
し、あるいはコンクリート製品などを製作する場合に型
枠を支持している支保工をいかに早期に解体できるかと
いうことは経済性からも重要な問題である。特に現在使
用中のトンネルのコンクリートを覆工する工事のように
1日の施工時間が数時間に制限されているような場合に
はきわめて重要である。そのためにはコンクリートなど
の強度を早期に発現すればよいが、その方法としてコン
クリートの養生温度を上げて養生時間を短縮する方法、
早強剤や急硬剤を使用する方法、超早強セメントを使用
する方法などが知られている。
2. Description of the Related Art When constructing a structure with concrete or mortar or manufacturing a concrete product, it is an important problem from the economic point of view how quickly a support supporting a formwork can be dismantled. It is. This is extremely important especially in the case where the construction time per day is limited to several hours, such as construction work for lining concrete in a tunnel currently in use. For that purpose, it is only necessary to express the strength of concrete etc. early, but as a method of raising the curing temperature of concrete, shortening the curing time,
A method using an early-strength agent or a hardening agent, a method using an ultra-high-strength cement, and the like are known.

【0003】[0003]

【本発明が解決しようとする課題】しかし従来の養生温
度を上げる方法は、コンクリートやモルタルの圧縮強度
と養生温度との関係が解明されていなかった。したがっ
て最適な条件は明確ではなかった。一方、早強剤、急硬
財、超早強セメントを使用する方法は品質管理が難し
く、コンクリートの表面にひび割れが発生する確率が大
きく、材料価格がきわめて高価になるなどの問題があ
る。
However, in the conventional method of raising the curing temperature, the relationship between the compressive strength of concrete or mortar and the curing temperature has not been clarified. Therefore, the optimal conditions were not clear. On the other hand, the method of using the early-strength agent, quick-hardened material, and ultra-high-strength cement has problems in that quality control is difficult, cracks are likely to occur on the concrete surface, and the material price is extremely high.

【0004】本発明は上記したような従来の問題を解決
するためになされたもので、コンクリートやモルタルの
圧縮強度と養生温度と時間との関係、およびその時の湿
度との関係を解明したことによって、最適な条件のもと
で型枠支保工を早期に解体できる方法を提供することを
目的とする。
The present invention has been made to solve the above-mentioned conventional problems, and has been made by elucidating the relationship between the compressive strength of concrete or mortar, the curing temperature and time, and the relationship between humidity and the humidity at that time. It is another object of the present invention to provide a method capable of dismantling a form support work at an early stage under optimum conditions.

【0005】[0005]

【課題を解決するための手段】上記のような目的を達成
するために本発明者らは種々の実験を行った。その結
果、圧縮強度は養生温度と時間の積の関係にあることを
解明した。この原理を利用したものが本件発明であっ
て、養生温度を40℃以上、養生湿度を80%以上、養
生時間を6時間以内に設定して型枠支保工を短時間で解
体する、型枠支保工の早期解体方法を特徴としたもので
ある。
The present inventors have conducted various experiments in order to achieve the above object. As a result, it was clarified that the compressive strength is related to the product of curing temperature and time. The present invention is based on this principle, and sets a curing temperature of 40 ° C. or more, a curing humidity of 80% or more, and a curing time of 6 hours or less, and dismantles a form support in a short time. It features a method of early dismantling of the shoring.

【0006】<イ>圧縮強度と養生温度の関係。 本件発明の発明者らは種々の実験を行った。その結果、
圧縮強度は養生温度と時間の積の関係にあることを解明
した。その関係を示すと、図1の通りである。すなわ
ち、養生温度を40℃とした場合、3時間半では強度は
発現していないが、5時間で18kgf/cm2 、5時間
45分で30kgf/cm2 を得ることができた。
<A> Relationship between compressive strength and curing temperature The inventors of the present invention conducted various experiments. as a result,
It was found that the compressive strength is related to the product of curing temperature and time. FIG. 1 shows the relationship. That is, when the curing temperature was 40 ° C., but is not expressed intensity at 3.5 hours, it was possible to obtain a 30 kgf / cm 2 for 5 hours at 18 kgf / cm 2, 5 hours and 45 minutes.

【0007】養生温度が30℃の場合では5時間でも強
度は発現せず、20℃では6時間でもまだ強度は発現し
ていない。しかもこれらの強度の上昇する勾配は大きく
相違している。すなわち、養生温度40℃とした場合は
急勾配であり、20℃ではきわめて緩やかである。この
ような結果から、本件発明者らは養生温度が40℃以上
で6時間以内が好ましいという結論に達した。
When the curing temperature is 30 ° C., the strength does not develop even after 5 hours, and when the curing temperature is 20 ° C., the strength has not yet developed even after 6 hours. Moreover, the gradients at which these intensities increase are greatly different. That is, when the curing temperature is 40 ° C., the gradient is steep, and at 20 ° C., it is extremely gentle. From these results, the present inventors have concluded that the curing temperature is preferably 40 ° C. or higher and within 6 hours.

【0008】<ロ>養生湿度とひび割れ発生確率の関
係。 本件発明者らはさらに養生湿度とひび割れの発生確率の
関係について慎重に検討した。その結果を示すと図2の
通りである。すなわち養生湿度が60%まではひび割れ
発生確率は100%であるが、養生湿度を上昇させると
急激にひび割れ発生確率が低下することが分かった。養
生湿度70%で発生確率は60%に、さらに養生湿度を
80%とするとひび割れ確率は0%程度まで低下してい
る。以上の結果から、本件発明者らは養生湿度80%以
上を維持することが好ましいという結論に達した。
<B> Relationship between curing humidity and crack generation probability. The present inventors have further carefully studied the relationship between the curing humidity and the probability of occurrence of cracks. FIG. 2 shows the results. That is, it was found that the crack occurrence probability was 100% when the curing humidity was up to 60%, but the crack occurrence probability sharply decreased when the curing humidity was increased. When the curing humidity is 70%, the probability of occurrence is 60%, and when the curing humidity is 80%, the crack probability is reduced to about 0%. From the above results, the present inventors have reached the conclusion that it is preferable to maintain the curing humidity at 80% or more.

【0009】[0009]

【本発明の実施の態様】以下図面を参照しながら本発明
の型枠支保工の早期解体方法をトンネルの覆工に使用し
た実施例について説明する。
Embodiments of the present invention will be described below with reference to the accompanying drawings, in which an embodiment in which the method for early demolition of a form support according to the present invention is used for tunnel lining.

【0010】<イ>ハーフPC版型枠の使用。 実施例は使用中の道路トンネルの既設のコンクリート1
が老朽化した場合に、その内側に新たなコンクリート覆
工を施して補強する場合の例に関するものである。その
ために老朽化した既設コンクリート1の内側に、一定の
間隔を介してハーフPC版2の型枠を設置する。ハーフ
PC版2は、工場生産したプレキャスト版であり、その
内側には多数本の鉄筋を突設した状態で製造してあり、
鉄筋コンクリート部材および型枠兼コンクリートの表面
仕上げ材として使用し、解体する必要はない。その厚さ
は一般に50〜150mmであり、どのサイズのものを
使用できるが、100mm以下のものが望ましい。この
ハーフPC版2の型枠によって新たなトンネルの内側面
が形成される。したがってハーフPC版2がコンクリー
トの圧力、打設の衝撃で移動しないように内側に設置し
た支保工3によってその位置を確保する。
<A> Use of half-PC formwork. In the embodiment, the existing concrete 1 of the used road tunnel is used.
The present invention relates to an example of a case in which a new concrete lining is provided to reinforce it when it is deteriorated. For this purpose, the half-PC version 2 formwork is installed at regular intervals inside the aged existing concrete 1. The half PC version 2 is a factory-produced precast version, and is manufactured with a large number of reinforcing bars protruding inside,
Used as a reinforced concrete member and a formwork / surface finish for concrete, there is no need to dismantle. The thickness is generally 50 to 150 mm, and any size can be used, but preferably 100 mm or less. The inner surface of a new tunnel is formed by the mold of the half PC version 2. Therefore, the half PC plate 2 is secured by the support 3 installed inside so as not to move due to the pressure of the concrete and the impact of the casting.

【0011】<ロ>保温、加湿。 既設のコンクリート1の層の内側にはハーフPC版2の
型枠を設置するから、その両端のみが開放状態となって
いる。そこで両端には断熱シート4を設置し、さらに内
部に加熱加湿器5を設置する。したがってハーフPC版
2と既設のコンクリート1層の内部の養生温度、および
湿度は自由に調整することができる。
<B> Heat retention and humidification. Since the half PC plate 2 formwork is installed inside the existing concrete 1 layer, only both ends are open. Therefore, a heat insulating sheet 4 is provided at both ends, and a heating humidifier 5 is further provided inside. Therefore, the curing temperature and humidity inside the half PC plate 2 and the existing one layer of concrete can be freely adjusted.

【0012】<ハ>コンクリートの打設。 既設のコンクリート1と、ハーフPC版2との間の空間
にコンクリート、あるいはモルタル6を打設する。その
場合に、前記した実験の結果の通り、次のような状況を
設定する。 養生温度:40℃以上。 養生湿度:80%以上。 養生時間:6時間以内。
<C> Casting concrete. Concrete or mortar 6 is poured into the space between the existing concrete 1 and the half PC plate 2. In that case, the following situation is set according to the result of the experiment described above. Curing temperature: 40 ° C or higher. Curing humidity: 80% or more. Curing time: within 6 hours.

【0013】<ニ>支保工3の解体。 前記した実験の通り、養生温度および養生湿度の適切な
設定によって、6時間以内の初期強度を発現することが
できる。したがってその時間の経過の直後には、支保工
3を解体することができる。支保工3を解体しても、ハ
ーフPC版2は解体する必要はなく、そのまま新たなコ
ンクリートあるいはモルタル6の構造部材として機能す
る。支保工3を解体すればその内側を交通に供すること
もできるし、あるいは早期に転用して次の工区での組み
立てに使用することができる。
<D> Disassembly of the shoring 3. As described above, by setting the curing temperature and the curing humidity appropriately, the initial strength within 6 hours can be developed. Therefore, immediately after the elapse of the time, the shoring 3 can be dismantled. Even if the support 3 is dismantled, the half PC plate 2 does not need to be dismantled and functions as a new concrete or mortar 6 structural member as it is. If the shoring 3 is dismantled, the inside of the shoring 3 can be used for traffic, or it can be diverted early and used for assembly in the next construction section.

【0014】[0014]

【本発明の効果】本発明の型枠支保工3の早期解体方法
は以上説明したように、コンクリートなどの圧縮強度が
養生温度と時間の積の関係にあること、およびその時の
湿度との関係を解明した結果、発明されたものである。
一方、既設のトンネルの覆工コンクリートの補強は、活
線において施工される場合がほとんどである。そのため
に施工時間は深夜の8時間程度に制限されることが多
い。このような場合に使用するコンクリートとして、養
生温度、湿度を上記の条件に設定することによって以下
のような効果が得られる。 <イ>施工方法が画一的で作業が容易である。 <ロ>二次製品を使用しているので、表面にひび割れが
発生しない。 <ハ>既設の覆工コンクリートとハーフPC版は、鉄筋
コンクリート部材となり一体化する。 <ニ>急硬剤、超早強セメントを使用しないのできわめ
て経済的である。 <ホ>養生温度、湿度を上げる機器は、特別なものでは
なく市販品をそのまま利用できるから経済的である。 <ヘ>トンネルの覆工のみならずあらゆるコンクリート
構造物、コンクリート、モルタル製品の製造工程におい
て、早期の支保工の解体が可能となり、その経済効果は
きわめて大きい。
As described above, the method for early dismantling of the formwork support 3 of the present invention has a relation that the compressive strength of concrete or the like is a product of the curing temperature and the time, and the relationship between the humidity and the humidity at that time. As a result of elucidating the above, the present invention was invented.
On the other hand, the reinforcement of the lining concrete of the existing tunnel is almost always carried out on livelines. Therefore, the construction time is often limited to about eight hours at midnight. The following effects can be obtained by setting the curing temperature and humidity to the above conditions as the concrete used in such a case. <a> The construction method is uniform and the work is easy. <B> Since a secondary product is used, no crack is generated on the surface. <C> The existing lining concrete and half PC version will be integrated into a reinforced concrete member. <D> It is very economical because it does not use a hardener or ultra-high strength cement. <E> The equipment for raising the curing temperature and humidity is economical because it is not special and a commercially available product can be used as it is. <F> In the process of manufacturing not only tunnel lining but also all concrete structures, concrete and mortar products, it is possible to dismantle the support at an early stage, and the economic effect is extremely large.

【図面の簡単な説明】[Brief description of the drawings]

【図1】養生時間と養生温度によって得られる圧縮強度
の関係を示す図。
FIG. 1 is a diagram showing a relationship between a curing time and a compressive strength obtained by a curing temperature.

【図2】養生湿度とひび割れ発生確率の関係を示す図。FIG. 2 is a diagram showing a relationship between a curing humidity and a crack generation probability.

【図3】型枠支保工3の早期解体方法の実施例の説明
図。
FIG. 3 is an explanatory view of an embodiment of an early dismantling method of the formwork support 3;

【図4】その一部断面図。FIG. 4 is a partial sectional view thereof.

【図5】その斜視図。FIG. 5 is a perspective view thereof.

フロントページの続き (72)発明者 坂本 全布 東京都新宿区西新宿一丁目25番1号 大成 建設株式会社内Continuing on the front page (72) Inventor Zenbu, 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】ハーフPC版を型枠として使用し、その空
間にコンクリート、あるいはモルタルを打設する工法で
あって、 養生温度:40℃以上、養生湿度:80%以上、の条件
でコンクリート、モルタルを打設し、 養生時間6時間以内に、ハーフPC版を支持する支保工
を解体できる、 型枠支保工の早期解体方法
1. A construction method in which a half PC plate is used as a formwork and concrete or mortar is poured into the space, wherein the curing temperature is 40 ° C. or more, and the curing humidity is 80% or more. Early dismantling method of formwork support that can dismantle support that supports half PC plate within 6 hours of curing time by placing mortar
【請求項2】トンネルを構成する既設のコンクリート
と、 その内側に設置したハーフPC版との空間にコンクリー
ト、あるいはモルタルを打設する工法であって、 養生温度:40℃以上、養生湿度:80%以上、の条件
でコンクリート、モルタルを打設し、 養生時間6時間以内に、ハーフPC版を支持する支保工
を解体できる、 型枠支保工の早期解体方法
2. A method of casting concrete or mortar in a space between an existing concrete forming a tunnel and a half PC plate installed inside the tunnel, wherein a curing temperature: 40 ° C. or more, and a curing humidity: 80 %, Concrete and mortar are poured under the condition of more than 5%, and the supporting method that supports the half PC plate can be dismantled within 6 hours of curing time.
JP8251015A 1996-09-02 1996-09-02 Early dismantling method of formwork timbering Pending JPH1077795A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8251015A JPH1077795A (en) 1996-09-02 1996-09-02 Early dismantling method of formwork timbering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8251015A JPH1077795A (en) 1996-09-02 1996-09-02 Early dismantling method of formwork timbering

Publications (1)

Publication Number Publication Date
JPH1077795A true JPH1077795A (en) 1998-03-24

Family

ID=17216372

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8251015A Pending JPH1077795A (en) 1996-09-02 1996-09-02 Early dismantling method of formwork timbering

Country Status (1)

Country Link
JP (1) JPH1077795A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104712345A (en) * 2015-01-31 2015-06-17 夏玉军 Tunnel lining concrete heat preserving and maintaining construction device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104712345A (en) * 2015-01-31 2015-06-17 夏玉军 Tunnel lining concrete heat preserving and maintaining construction device
CN106246209A (en) * 2015-01-31 2016-12-21 夏玉军 A kind of tunnel inner lining concrete insulated curing constructing device and construction method thereof

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