JP6885641B1 - Underfloor reinforcement structure and underfloor reinforcement structure reinforcement method - Google Patents

Underfloor reinforcement structure and underfloor reinforcement structure reinforcement method Download PDF

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JP6885641B1
JP6885641B1 JP2020171089A JP2020171089A JP6885641B1 JP 6885641 B1 JP6885641 B1 JP 6885641B1 JP 2020171089 A JP2020171089 A JP 2020171089A JP 2020171089 A JP2020171089 A JP 2020171089A JP 6885641 B1 JP6885641 B1 JP 6885641B1
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政広 阿部
政広 阿部
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株式会社阿部技建
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Abstract

【課題】空洞部周囲の地盤を空洞部や周囲の地盤と比較して強固に形成でき再沈下を防止でき、空洞部の充填部を地盤と一体化させることで空洞部と地盤との間に水が溜まる可能性を低減することができる床下補強構造を提供する。【解決手段】床下補強構造１００は、コンクリート床１０とその下方の地盤２０との間に形成された空洞部に充填された樹脂が発泡して形成された弾性を有する発泡樹脂部３５と、前記樹脂が地盤２０の表面から発泡樹脂部３５より含水比が低い状態で１ｃｍ以上浸透し、発泡樹脂部３５より高い圧縮強さを有する樹脂浸透地盤２５とを有する。【選択図】図６PROBLEM TO BE SOLVED: To form a stronger ground around a cavity as compared with the cavity and the surrounding ground and prevent re-sink, and to integrate a filling portion of the cavity with the ground, between the cavity and the ground. Provide an underfloor reinforcement structure that can reduce the possibility of water accumulation. An underfloor reinforcing structure 100 includes an elastic foamed resin portion 35 formed by foaming a resin filled in a cavity formed between a concrete floor 10 and a ground 20 below the concrete floor 10. The resin permeates from the surface of the ground 20 in a state where the water content ratio is lower than that of the foamed resin portion 35 by 1 cm or more, and has a resin permeated ground 25 having a compressive strength higher than that of the foamed resin portion 35. [Selection diagram] Fig. 6

Description

本発明は、床下補強構造及び床下補強構造の補強工法に関する。 The present invention relates to an underfloor reinforcing structure and a method for reinforcing an underfloor reinforcing structure.

工場、倉庫又は店舗等の建築構造物や、道路、公園又は空港等の土木建築物を構築する際に、床面又は路面の補強のために地盤の表面にコンクリート床面を敷設して強化することがある。こうしたコンクリート床面は、下の地盤が沈下することによって、コンクリート床面と地盤との間に空洞部が発生する場合がある。こうした空洞部を補修する方法として、所定の高さにまで上昇させたい修復必要箇所の下方の地盤の内部に、フロンガスを発生しない膨張性樹脂を注入し、これを膨張させて、修復必要箇所の基礎構造体を所定の高さにまで上昇させることを特徴とするものが提案されている（特許文献１）。 When constructing building structures such as factories, warehouses or stores, or civil engineering buildings such as roads, parks or airports, concrete floors are laid on the surface of the ground to reinforce the floors or roads. Sometimes. In such a concrete floor surface, a cavity may be generated between the concrete floor surface and the ground due to the subsidence of the underlying ground. As a method of repairing such a cavity, an expandable resin that does not generate chlorofluorocarbons is injected into the ground below the repair-required part that needs to be raised to a predetermined height, and this is expanded to expand the repair-required part. A method has been proposed in which the basic structure is raised to a predetermined height (Patent Document 1).

しかしながら、かかる補修方法は、あくまで、空洞部内のみを樹脂で充填するものであるため、さらなる地盤の沈下による空洞部の拡張を防止することができず、また、空洞部と樹脂との間に水が発生し、地盤の弱体化、害虫発生や悪臭の発生といった汚染を防止することができないという問題があった。さらに、上述した補修方法は、空隙や地盤の内部で膨張し基礎構造体の修復必要箇所に加わる荷重よりも上回る膨張によって反力が発生する樹脂を使用する必要があるが、このような硬度が高い樹脂を使用すると、補修後のコンクリート床面の上で発生する機械による振動や車両の通過による振動に対する衝撃吸収性が低くなり、コンクリート床面を損傷させやすくなるという問題点もあった。 However, since such a repair method only fills the inside of the cavity with resin, it is not possible to prevent the cavity from expanding due to further subsidence of the ground, and water is provided between the cavity and the resin. There was a problem that pollution such as weakening of the ground, generation of pests and generation of foul odors could not be prevented. Furthermore, the above-mentioned repair method requires the use of a resin that expands inside the voids and the ground and generates a reaction force due to expansion exceeding the load applied to the repair-required part of the foundation structure. When a high resin is used, there is a problem that the shock absorption against the vibration generated by the machine on the concrete floor surface after the repair and the vibration caused by the passage of the vehicle is lowered, and the concrete floor surface is easily damaged.

特開２００６−１４４２６９号公報Japanese Unexamined Patent Publication No. 2006-144269

そこで、本発明は、上述した問題点を解決するためになされたものであり、床下コンクリート内の空間に樹脂を注入して発泡樹脂で補強した際に、空洞部周囲の地盤を空洞部や周囲の地盤と比較して強固に形成でき再沈下を防止でき、空洞部の充填部を地盤と一体化させることで空洞部と地盤との間に水が溜まる可能性を低減することができる床下補強構造及び床下補強構造の補強工法を提供することを目的とする。 Therefore, the present invention has been made to solve the above-mentioned problems, and when resin is injected into the space in the underfloor concrete and reinforced with foamed resin, the ground around the cavity is formed in the cavity and its surroundings. Underfloor reinforcement that can be formed more firmly than the ground and can prevent re-sinking, and can reduce the possibility of water collecting between the cavity and the ground by integrating the filling part of the cavity with the ground. An object of the present invention is to provide a method for reinforcing a structure and an underfloor reinforcing structure.

本発明は、上述の目的を達成するために以下の手段を採った。
本発明にかかる床下補強構造は、
コンクリート床とその下方の地盤との間に形成された空洞部に充填された樹脂が発泡して形成された弾性を有する厚さ１．５ｃｍ以下の発泡樹脂部と、
前記樹脂が前記地盤の表面から１０ｃｍ以上浸透し、前記発泡樹脂部より高い圧縮強さを有する樹脂浸透地盤と、
を有することを特徴とする。 The present invention has taken the following measures to achieve the above object.
The underfloor reinforcement structure according to the present invention is
An elastic foamed resin portion with a thickness of 1.5 cm or less formed by foaming a resin filled in a cavity formed between a concrete floor and the ground below it, and a foamed resin portion having a thickness of 1.5 cm or less.
A resin-penetrated ground in which the resin permeates 10 cm or more from the surface of the ground and has a higher compressive strength than the foamed resin portion.
It is characterized by having.

本発明にかかる床下補強構造は、コンクリート床と地盤との間に形成された空洞に発泡した後に弾性を有するように硬化した発泡樹脂部と、含水比が低い状態で地盤に浸透し空洞部よりも発泡率が低い状態で、地盤に接着しつつ硬化された樹脂浸透地盤と、で形成される。そのため、発泡樹脂部の上に配置されるコンクリート床は、コンクリート床の振動を効果的に吸収可能であるとともに、発泡樹脂部と樹脂浸透地盤が樹脂で一体に形成されるため、発泡樹脂部と樹脂浸透地盤の境界に水が溜まることを防止することができる。そのため、地盤の弱体化、害虫発生や悪臭の発生といった汚染を防止することができる。また、１０ｃｍ以上地盤内に浸透されているため、床下を補強した後に、再沈下が発生する可能性を低減することができる。 The underfloor reinforcing structure according to the present invention includes a foamed resin portion that has been foamed into a cavity formed between a concrete floor and the ground and then hardened to have elasticity, and a foamed resin portion that has penetrated into the ground with a low water content and penetrates from the cavity. Is also formed of a resin-penetrated ground that is hardened while adhering to the ground in a state where the foaming rate is low. Therefore, the concrete floor arranged on the foamed resin portion can effectively absorb the vibration of the concrete floor, and the foamed resin portion and the resin permeation ground are integrally formed of the resin. It is possible to prevent water from accumulating at the boundary of the resin-penetrated ground. Therefore, it is possible to prevent pollution such as weakening of the ground, generation of pests and generation of foul odors. In addition, since it has penetrated into the ground by 10 cm or more, it is possible to reduce the possibility of re-sinking after reinforcing the underfloor.

また、本発明にかかる床下補強構造において、前記コンクリート床のひび割れ又はクラックに対して底面側から浸透された発泡樹脂を有することを特徴とするものであってもよい。 Further, the underfloor reinforcing structure according to the present invention may be characterized by having a foamed resin permeated from the bottom surface side against cracks or cracks in the concrete floor.

かかる構成を採用することによって、発泡樹脂部と、樹脂浸透地盤と、コンクリート床が樹脂で一体化されるので、より強い床下補強構造とすることができる。 By adopting such a configuration, the foamed resin portion, the resin infiltrated ground, and the concrete floor are integrated with the resin, so that a stronger underfloor reinforcing structure can be obtained.

また、本発明にかかる床下補強構造において、前記発泡樹脂部は、圧縮強さが４５０ｋＮ／ｍ２以上であり、前記樹脂浸透地盤は６００ｋＮ／ｍ２以上であり、かつ前記樹脂浸透地盤は、前記発泡樹脂部よりも圧縮強さが高いことを特徴とするものであってもよい。 Further, in the underfloor reinforcing structure according to the present invention, the foamed resin portion, compressive strength is at 450kN / m 2 or more, the resin penetrates the ground is at 600 kN / m 2 or more, and the resin permeation ground, the It may be characterized in that the compressive strength is higher than that of the foamed resin portion.

発泡樹脂部よりも樹脂浸透地盤の圧縮強さを強くしておくことで、床下補強構造に強い圧縮強さが加わった場合にも樹脂浸透地盤が先に破損することを防止することができ、コンクリート床に大きな損傷が発生することを防止することができる。 By making the compressive strength of the resin infiltrated ground stronger than that of the foamed resin part, it is possible to prevent the resin infiltrated ground from being damaged first even when a strong compressive strength is applied to the underfloor reinforcing structure. It is possible to prevent major damage to the concrete floor.

さらに、本発明にかかる床下補強構造において、前記樹脂は、ウレタンプレポリマーと、ポリメチレンポリフェニルポリイソシアネートと、フタル酸ジ−ｎ−ブチルとを含む主剤と、ジメチルアルキルアミンを含む触媒とからなることを特徴とするものであってもよい。 Further, in the underfloor reinforcing structure according to the present invention, the resin comprises a urethane prepolymer, a main agent containing polymethylenepolyphenylpolyisocyanate, di-n-butyl phthalate, and a catalyst containing dimethylalkylamine. It may be characterized in that.

上述した床下補強構造を形成するに際して、この樹脂を使用することによって好適に形成することができる。 When forming the above-mentioned underfloor reinforcing structure, it can be suitably formed by using this resin.

さらに、本発明は、前述した床下補強構造の補強工法をも提供する。
本発明にかかる床下補強構造の補強工法は、
（１）コンクリート床とその下方の地盤との間に空洞部が形成された部位のコンクリート床に０．５ｃｍ〜１．０ｃｍの貫通孔を穿設する穿設工程
（２）空洞部に水を注入し、地盤内に水を浸透させる水浸透工程
（３）穿設された貫通孔に綿を詰める綿詰工程
（４）詰められた綿に樹脂を注入するノズルを貫通させ、樹脂を注入する注入工程
（５）樹脂が地盤内に浸透し樹脂浸透地盤を形成するとともに、空洞部で膨張させ発泡樹脂部を形成させるため養生させる養生工程
（６）貫通孔をコンクリートで塞ぐ閉塞工程
を含むことを特徴とする床下補強構造の補強工法。 Further, the present invention also provides the above-mentioned reinforcement method for the underfloor reinforcing structure.
The reinforcement method of the underfloor reinforcement structure according to the present invention is
(1) Drilling process of drilling a through hole of 0.5 cm to 1.0 cm in the concrete floor of the part where the cavity is formed between the concrete floor and the ground below it (2) Water is poured into the cavity. Water permeation process of injecting and infiltrating water into the ground (3) Cotton filling process of filling the drilled through holes with cotton (4) Injecting resin into the stuffed cotton Penetrate the nozzle and inject the resin Injection step (5) A curing step in which the resin permeates into the ground to form a resin-permeated ground and is cured to expand in the cavity to form a foamed resin part (6) Include a closing step of closing the through hole with concrete. Reinforcement method of underfloor reinforcement structure characterized by.

かかる床下補強構造の補強工法によれば、上述した効果を有する床下補強構造を好適に作製することができる。 According to the underfloor reinforcement structure reinforcement method, an underfloor reinforcement structure having the above-mentioned effects can be suitably produced.

さらに、本発明にかかる床下補強構造の補強工法において、前記注入工程は、１．５ｋｇｆ／ｃｍ２以上の圧力で注入することを特徴とするものであってもよい。かかる構成を採用することによって、発泡樹脂部と、樹脂浸透地盤と、コンクリート床を樹脂で一体化した補強構造とすることができる。 Further, in the method for reinforcing the underfloor reinforcing structure according to the present invention, the injection step may be characterized in that injection is performed at a pressure of 1.5 kgf / cm 2 or more. By adopting such a configuration, it is possible to form a reinforced structure in which the foamed resin portion, the resin infiltrated ground, and the concrete floor are integrated with resin.

本発明にかかる床下補強構造によれば、床下コンクリート内の空間に樹脂を注入して発泡樹脂で補強した際に、空洞部周囲の地盤を空洞部や周囲の地盤と比較して強固に形成でき再沈下を防止でき、空洞部の充填部を地盤と一体化させることで空洞部と地盤との間に水が溜まる可能性を低減することができる床下補強構造を提供することができる。また、かかる床下補強構造の補強工法をも提供する。 According to the underfloor reinforcement structure according to the present invention, when resin is injected into the space inside the underfloor concrete and reinforced with foamed resin, the ground around the cavity can be formed more firmly than the cavity and the surrounding ground. It is possible to provide an underfloor reinforcing structure capable of preventing re-sinking and reducing the possibility of water accumulation between the cavity and the ground by integrating the filling portion of the cavity with the ground. It also provides a reinforcement method for such an underfloor reinforcement structure.

図１は、実施形態にかかる床下補強構造１００の補強工法を示すフローチャートである。FIG. 1 is a flowchart showing a reinforcing method of the underfloor reinforcing structure 100 according to the embodiment. 図２は、実施形態にかかる床下補強構造１００の補強工法の１工程を示す模式図である。FIG. 2 is a schematic view showing one step of the reinforcement method of the underfloor reinforcement structure 100 according to the embodiment. 図３は、実施形態にかかる床下補強構造１００の補強工法の１工程を示す模式図である。FIG. 3 is a schematic view showing one step of the reinforcement method of the underfloor reinforcement structure 100 according to the embodiment. 図４は、実施形態にかかる床下補強構造１００の補強工法の１工程を示す模式図である。FIG. 4 is a schematic view showing one step of the reinforcement method of the underfloor reinforcement structure 100 according to the embodiment. 図５は、実施形態にかかる床下補強構造１００の補強工法の１工程を示す模式図である。FIG. 5 is a schematic view showing one step of the reinforcement method of the underfloor reinforcement structure 100 according to the embodiment. 図６は、実施形態にかかる床下補強構造１００の補強工法の１工程を示す模式図であり、完成した床下補強構造１００をも示す。FIG. 6 is a schematic view showing one step of the reinforcement method of the underfloor reinforcement structure 100 according to the embodiment, and also shows the completed underfloor reinforcement structure 100.

次に、本発明にかかる床下補強構造１００及び床下補強構造１００の補強工法について、図を参照しつつ詳細に説明する。なお、以下に説明する実施の形態及び図面は、本発明の実施形態の一部を例示するものであり、これらの構成に限定する目的に使用されるものではなく、本発明の要旨を逸脱しない範囲において適宜変更することができる。 Next, the underfloor reinforcement structure 100 and the reinforcement method for the underfloor reinforcement structure 100 according to the present invention will be described in detail with reference to the drawings. The embodiments and drawings described below exemplify a part of the embodiments of the present invention, are not used for the purpose of limiting to these configurations, and do not deviate from the gist of the present invention. It can be changed as appropriate within the range.

（実施形態）
まず、はじめに本発明にかかる床下補強構造１００の補強工法について説明する。図１は、本発明にかかる工程のフローチャートである。本発明にかかる床下補強構造１００の補強工法は、主として、コンクリート床１０とその下方の地盤２０との間に空洞部３０が形成された部位のコンクリート床１０に０．５ｃｍ〜１．０ｃｍの貫通孔４０を穿設する穿設工程（Ｓ１）、空洞部に水を注入する水浸透工程（Ｓ２）、穿設された貫通孔４０に綿５０を詰める綿詰工程（Ｓ３）、詰められた綿５０に樹脂７０を注入するノズル７５を貫通させ、樹脂７０を注入する注入工程（Ｓ４）、樹脂７０が地盤２０内に浸透し樹脂浸透地盤２５を形成するとともに、空洞部３０で膨張して発泡樹脂部３５を形成させるため養生させる養生工程（Ｓ５）、貫通孔４０をコンクリート１５で塞ぐ閉塞工程（Ｓ６）、を含む。以下、各工程について詳細に説明する。 (Embodiment)
First, a reinforcing method for the underfloor reinforcing structure 100 according to the present invention will be described. FIG. 1 is a flowchart of a process according to the present invention. The reinforcement method of the underfloor reinforcing structure 100 according to the present invention mainly penetrates the concrete floor 10 at a portion where the cavity 30 is formed between the concrete floor 10 and the ground 20 below the concrete floor 10 by 0.5 cm to 1.0 cm. A piercing step (S1) for piercing the hole 40, a water permeation step (S2) for injecting water into the cavity, a cotton filling step (S3) for filling the pierced through hole 40 with cotton 50, and stuffed cotton. In the injection step (S4) in which the resin 70 is injected through the nozzle 75 for injecting the resin 70 into the 50, the resin 70 permeates into the ground 20 to form the resin-penetrated ground 25, and expands and foams in the cavity 30. It includes a curing step (S5) of curing to form the resin portion 35, and a closing step (S6) of closing the through hole 40 with concrete 15. Hereinafter, each step will be described in detail.

（１）穿設工程（Ｓ１）
穿設工程（Ｓ１）は、図２に示すように、コンクリート床１０とその下方の地盤２０との間に空洞部３０が形成されている部位に、樹脂７０を注入するために、空洞部３０と連通する貫通孔４０（図３参照）をコンクリート床１０に穿設する工程である。貫通孔４０は、ドリル等８０によって開けられる。貫通孔４０の直径は、０．５ｃｍ〜１．０ｃｍ程度である。 (1) Drilling process (S1)
In the drilling step (S1), as shown in FIG. 2, in order to inject the resin 70 into the portion where the cavity 30 is formed between the concrete floor 10 and the ground 20 below the concrete floor 10, the cavity 30 is formed. This is a step of drilling a through hole 40 (see FIG. 3) communicating with the concrete floor 10 in the concrete floor 10. The through hole 40 is opened by a drill or the like 80. The diameter of the through hole 40 is about 0.5 cm to 1.0 cm.

（２）水浸透工程（Ｓ２）
水浸透工程は、空洞部３０の周囲の地盤２０に水を浸透させる工程である。水を地盤に浸透させることによって、水と親和性の高い樹脂の地盤内への浸透を促進させるとともに、地盤２０内で発泡促進させるためである。水を浸透させるには、ノズルで注入しても良いし、空洞部３０内で噴霧してもよい。水は、１ｍ２あたり、１００ｍｌ以上注入することが好ましい。
（３）綿詰工程（Ｓ３）
綿詰工程（Ｓ３）は、図３に示すように、穿設工程（Ｓ１）で開けた貫通孔４０に綿５０を詰める工程である。綿５０を詰める理由は、後述する注入工程（Ｓ４）で樹脂７０を注入するノズル７５（図４参照）を、挿入する際に、貫通孔４０に詰めてあるのが綿５０であるといわばノズル７５を無理やり押し広げて綿を通過させて、空洞部３０にノズル７５の先端を設置しやすいこと、及び樹脂７０が充填された後、綿５０で樹脂７０が貫通孔４０から溢れ出るのを防止するとともに、適度な圧力が加わることによって樹脂７０を地盤２０内に浸透させることができるからである。 (2) Water infiltration step (S2)
The water infiltration step is a step of infiltrating water into the ground 20 around the cavity 30. This is because the permeation of water into the ground promotes the permeation of the resin having a high affinity with water into the ground and the foaming in the ground 20. In order to allow water to permeate, it may be injected with a nozzle or sprayed in the cavity 30. It is preferable to inject 100 ml or more of water per 1 m 2.
(3) Cotton filling process (S3)
As shown in FIG. 3, the cotton filling step (S3) is a step of filling the through hole 40 opened in the drilling step (S1) with the cotton 50. The reason for packing the cotton 50 is that when the nozzle 75 (see FIG. 4) for injecting the resin 70 in the injection step (S4) described later is inserted, the cotton 50 is packed in the through hole 40. The tip of the nozzle 75 can be easily installed in the cavity 30 by forcibly spreading the 75 and letting the cotton pass through, and the cotton 50 prevents the resin 70 from overflowing from the through hole 40 after being filled with the resin 70. This is because the resin 70 can be permeated into the ground 20 by applying an appropriate pressure.

（４）注入工程（Ｓ４）
注入工程（Ｓ４）は、図４に示すように、樹脂７０を注入するノズル７５を空洞部３０内に挿入し、樹脂７０を注入する工程である。このときに、貫通孔４０には綿５０が詰めてあるので、綿５０をいわば無理やり押し広げつつノズル７５を挿入する。樹脂７０は、空洞部３０内の水に反応して膨張するので、空洞部３０に水が少ない場合には、任意に水を貫通孔４０から同時に注入する。樹脂７０が充填した状態からさらに注入することによって、図５に示すように、綿５０によって樹脂７０が貫通孔４０から溢れ出ることなく圧力が高くなって、地盤２０内に樹脂７０が浸透していくことになる。樹脂は、発泡前の状態で、１ｃｍの深さの空洞部３０の場合１ｍ２あたり２ｋｇ以上注入するとよい。 (4) Injection step (S4)
As shown in FIG. 4, the injection step (S4) is a step of inserting the nozzle 75 for injecting the resin 70 into the cavity 30 and injecting the resin 70. At this time, since the through hole 40 is filled with cotton 50, the nozzle 75 is inserted while forcibly expanding the cotton 50, so to speak. Since the resin 70 expands in response to water in the cavity 30, when there is little water in the cavity 30, water is arbitrarily injected through the through holes 40 at the same time. By further injecting the resin 70 from the filled state, as shown in FIG. 5, the cotton 50 increases the pressure without the resin 70 overflowing from the through hole 40, and the resin 70 permeates into the ground 20. Will go. In the case of the cavity 30 having a depth of 1 cm, the resin may be injected in an amount of 2 kg or more per 1 m 2 in the state before foaming.

なお、ここで使用される樹脂７０としては、発泡が開始する前に地盤２０内に浸透可能であって、空洞部３０内では十分に発泡し、発泡した後に弾性を有するものが使用される。例えば、ウレタンプレポリマーと、ポリメチレンポリフェニルポリイソシアネートと、フタル酸ジ−ｎ−ブチルとを含む主剤と、ジメチルアルキルアミンを含む触媒とからなる樹脂を使用することができる。主剤と触媒は、１８ｋｇに対して０．４５ｋｇの割合で混合するとよい。かかる樹脂は、水と反応して発泡するものの、水がない状態ではほとんど発泡することはない。そのため、空洞部３０においては、十分に発泡して弾性を有する発泡樹脂部３５を形成し、一方で、本樹脂は、地盤２０内に水を予め浸透させた後に浸透させることで、樹脂が地盤内に速やかに浸透しつつ、発泡が促進され、地盤２０内に少なくとも１０ｃｍ以上浸透可能である。地盤２０内では含水比が低い状態で発泡時に発生する二酸化炭素を地盤２０外に排出し、空洞部では約３０倍に発泡し、弾性が高い発泡樹脂となるとともに、発泡が抑制された樹脂が地盤２０に浸透した樹脂浸透地盤２５が形成される。そのため、発泡樹脂部３５は、樹脂浸透地盤２５に対して圧縮強さが低く、かつ弾性が高くなる。なお、本発明で形成される発泡樹脂部３５は、厚さが１．５ｃｍ以下、より好ましくは１ｃｍ以下である。すなわち、補修に付される空洞部の深さが１．５ｃｍ以下であることが必要である。これより深いと、樹脂７０に圧力が加わりづらく地盤２０に浸透しなくなる上、樹脂７０の弾性によりコンクリート床１０を確実に支持することが難しくなるからである。さらに、樹脂は、コンクリート床のひび割れ又はクラックに対して底面側から浸透し、発泡樹脂部と、樹脂浸透地盤と、コンクリート床を樹脂で一体化した補強構造とすることができる。 As the resin 70 used here, a resin that can penetrate into the ground 20 before the start of foaming, sufficiently foams in the cavity 30, and has elasticity after foaming is used. For example, a resin composed of a urethane prepolymer, a main agent containing polymethylene polyphenyl polyisocyanate, di-n-butyl phthalate, and a catalyst containing dimethylalkylamine can be used. The main agent and the catalyst may be mixed at a ratio of 0.45 kg to 18 kg. Although such a resin reacts with water and foams, it hardly foams in the absence of water. Therefore, in the hollow portion 30, the foamed resin portion 35 is sufficiently foamed to form an elastic foamed resin portion 35, while in this resin, water is permeated into the ground 20 in advance and then permeated to allow the resin to permeate the ground. Foaming is promoted while rapidly penetrating into the ground, and at least 10 cm or more can penetrate into the ground 20. Carbon dioxide generated during foaming in the ground 20 with a low water content is discharged to the outside of the ground 20, and foams about 30 times in the cavity, resulting in a highly elastic foamed resin and a resin in which foaming is suppressed. A resin-penetrated ground 25 that has penetrated into the ground 20 is formed. Therefore, the foamed resin portion 35 has a low compressive strength and a high elasticity with respect to the resin infiltrated ground 25. The foamed resin portion 35 formed in the present invention has a thickness of 1.5 cm or less, more preferably 1 cm or less. That is, it is necessary that the depth of the cavity to be repaired is 1.5 cm or less. If it is deeper than this, it is difficult for pressure to be applied to the resin 70 and it does not penetrate into the ground 20, and it becomes difficult to reliably support the concrete floor 10 due to the elasticity of the resin 70. Further, the resin permeates the cracks or cracks of the concrete floor from the bottom surface side, and the foamed resin portion, the resin permeated ground, and the concrete floor can be integrated with the resin to form a reinforcing structure.

（５）養生工程（Ｓ５）
養生工程（Ｓ５）は、注入した樹脂７０が地盤２０内に浸透し樹脂浸透地盤２５を形成するとともに、空洞部３０で膨張させ発泡樹脂部３５を形成させる工程である。注入後、概ね３０分程度放置する。これにより、発泡樹脂部３５は膨張し、弾性を有し、圧縮強さが４５０ｋＮ／ｍ２以上に形成され、地盤２０には少なくとも１ｃｍ以上浸透し、樹脂浸透地盤２５は６００ｋＮ／ｍ２以上の圧縮強さに形成される。 (5) Curing process (S5)
The curing step (S5) is a step in which the injected resin 70 permeates into the ground 20 to form the resin-permeated ground 25 and expands in the cavity 30 to form the foamed resin portion 35. After injection, leave it for about 30 minutes. As a result, the foamed resin portion 35 expands and has elasticity, is formed with a compressive strength of 450 kN / m 2 or more, penetrates into the ground 20 by at least 1 cm or more, and the resin-penetrated ground 25 has 600 kN / m 2 or more. Formed to compressive strength.

（６）閉塞工程（Ｓ６）
閉塞工程（Ｓ６）は、図６に示すように、養生が終了した後に、貫通孔４０をコンクリート１５で閉塞する工程である。貫通孔４０は、詰められた綿５０に樹脂７０が浸透し硬化しているので、その上からコンクリート１５を注入し、貫通孔４０を塞ぐ。この際に、本発明では、コンクリート１５にクラックやひびがある場合、表面に樹脂７０が吹き出ていることがあるので、その場合には、スクレイパーで削り取る。 (6) Closing step (S6)
As shown in FIG. 6, the closing step (S6) is a step of closing the through hole 40 with the concrete 15 after the curing is completed. Since the resin 70 has penetrated into the stuffed cotton 50 and hardened in the through hole 40, concrete 15 is injected from above the through hole 40 to close the through hole 40. At this time, in the present invention, if the concrete 15 has cracks or cracks, the resin 70 may be blown out on the surface. In that case, scrape off with a scraper.

こうして作製された床下補強構造１００は、図６に示すように、補強前から存在するコンクリート床１０、沈下した地盤２０、空洞部３０に充填された発泡樹脂部３５及び地盤２０の一部に浸透した樹脂浸透地盤２５で構成される。このような構成を有する床下補強構造１００は、地盤２０内に樹脂７０が浸透して空洞部３０の周囲の地盤２０が硬化されている樹脂浸透地盤２５を形成するので、さらに地盤２０が沈下することを低減することができる。また樹脂７０が空洞部３０の発泡樹脂部３５と一体化されているので、空洞部３０の発泡樹脂部３５と地盤２０との境界に水が発生することが防止される。そのため、地盤２０の弱体化、害虫発生や悪臭の発生といった汚染を防止することができる。さらに発泡樹脂部３５は弾性を有しているので、床上に配置される機械や車両等の通過等によって発生する振動を吸収することができるので、コンクリート床１０の寿命を伸ばすことができる。 As shown in FIG. 6, the underfloor reinforcing structure 100 thus produced permeates the concrete floor 10 existing before the reinforcement, the subsided ground 20, the foamed resin portion 35 filled in the cavity 30, and a part of the ground 20. It is composed of the resin-penetrated ground 25. The underfloor reinforcing structure 100 having such a configuration forms a resin-penetrated ground 25 in which the resin 70 permeates into the ground 20 and the ground 20 around the cavity 30 is hardened, so that the ground 20 further sinks. That can be reduced. Further, since the resin 70 is integrated with the foamed resin portion 35 of the cavity portion 30, it is possible to prevent water from being generated at the boundary between the foamed resin portion 35 of the cavity portion 30 and the ground 20. Therefore, it is possible to prevent pollution such as weakening of the ground 20 and generation of pests and foul odors. Further, since the foamed resin portion 35 has elasticity, it is possible to absorb the vibration generated by the passage of a machine, a vehicle, or the like arranged on the floor, so that the life of the concrete floor 10 can be extended.

本発明は、空洞部が形成されたコンクリート床下の補修工事として産業上利用することができる。 The present invention can be industrially used as repair work under a concrete floor in which a cavity is formed.

１０…コンクリート床、１５…コンクリート、２０…地盤、２５…樹脂浸透地盤、３０…空洞部、３５…発泡樹脂部、４０…貫通孔、５０…綿、７０…樹脂、７５…ノズル、８０…ドリル等、１００…床下補強構造 10 ... concrete floor, 15 ... concrete, 20 ... ground, 25 ... resin infiltrated ground, 30 ... cavity, 35 ... foamed resin, 40 ... through hole, 50 ... cotton, 70 ... resin, 75 ... nozzle, 80 ... drill Etc., 100 ... Underfloor reinforcement structure

Claims (1)

コンクリート床とその下方の地盤との間に形成された空洞部に充填された樹脂が発泡して形成された弾性を有する厚さ１．５ｃｍ以下の発泡樹脂部と、
前記樹脂が前記地盤の表面から１０ｃｍ以上浸透し、前記発泡樹脂部より高い圧縮強さを有する樹脂浸透地盤と、を有する床下補強構造を作製するための補強工法において、
（１）コンクリート床とその下方の地盤との間に空洞部が形成された部位のコンクリー
ト床に０．５ｃｍ〜１．０ｃｍの貫通孔を穿設する穿設工程
（２）空洞部に水を注入し、地盤内に水を浸透させる水浸透工程
（３）穿設された貫通孔に綿を詰める綿詰工程
（４）詰められた綿にウレタンプレポリマーと、ポリメチレンポリフェニルポリイソシアネートと、フタル酸ジ−ｎ−ブチルとを含む主剤と、ジメチルアルキルアミンを含む触媒とからなる樹脂を注入するノズルを貫通させ、１．５ｋｇｆ／ｃｍ ２ 以上の圧力で樹脂を注入する注入工程
（５）樹脂が地盤内に浸透し樹脂浸透地盤を形成するとともに、空洞部で膨張させ発泡
樹脂部を形成させるため養生させる養生工程
（６）貫通孔をコンクリートで塞ぐ閉塞工程
を含むことを特徴とする床下補強構造の補強工法。 An elastic foamed resin portion with a thickness of 1.5 cm or less formed by foaming a resin filled in a cavity formed between a concrete floor and the ground below it, and a foamed resin portion having a thickness of 1.5 cm or less.
In a reinforcing method for producing an underfloor reinforcing structure having a resin-penetrated ground in which the resin permeates 10 cm or more from the surface of the ground and has a higher compressive strength than the foamed resin portion.
(1) Concrete where a cavity is formed between the concrete floor and the ground below it.
Drilling process to drill a through hole of 0.5 cm to 1.0 cm in the floor
(2) Water infiltration process in which water is injected into the cavity and the water is infiltrated into the ground.
(3) Cotton filling process of filling the drilled through holes with cotton
(4) Penetrate a nozzle for injecting a resin composed of a urethane prepolymer, a polymethylene polyphenyl polyisocyanate, a main agent containing di-n-butyl phthalate, and a catalyst containing dimethylalkylamine into stuffed cotton. Injecting step of injecting resin at a pressure of 1.5 kgf / cm 2 or more
(5) The resin permeates into the ground to form a resin-permeated ground, and at the same time, expands and foams in the cavity.
Curing process to cure to form the resin part
(6) Closing process of closing the through hole with concrete
Reinforcement method of underfloor reinforcement structure characterized by including.
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