JP4251490B2

JP4251490B2 - Repair method for porous concrete sound absorbing panel

Info

Publication number: JP4251490B2
Application number: JP2004102693A
Authority: JP
Inventors: 純植松; 憲樹松尾; 政司伊地知
Original assignee: クリオン株式会社
Priority date: 2004-03-31
Filing date: 2004-03-31
Publication date: 2009-04-08
Anticipated expiration: 2024-03-31
Also published as: JP2005290668A

Description

本発明は、老朽化により強度が低下した多孔質コンクリート吸音パネルを復元させる多孔質コンクリート吸音パネルの補修方法に関するものである。 The present invention relates to a method for repairing a porous concrete sound-absorbing panel that restores the porous concrete sound-absorbing panel whose strength has decreased due to aging.

一般にコンクリートは、外部からの二酸化炭素・酸性雨等の侵入による中性化や塩化ナトリウムとの反応により、母材自身が劣化して強度が低下したり母材の膨張収縮により内部に微細な亀裂が発生する。
さらに、劣化したコンクリート表面に発生した亀裂から内部へ水分が侵入すると、内部で水が凍結膨張することにより亀裂を拡大させることもある。
そこで、劣化したコンクリートを補修するとともに、その強度を復元させる方法がいろいろと提案されている。
具体的には、劣化したＡＬＣパネルの復元工法として特許文献１、およびコンクリート構造物のクラック・目地等の補修方法として特許文献２が知られている。 In general, concrete is neutralized by the intrusion of carbon dioxide, acid rain, etc. from the outside, and reacts with sodium chloride, so that the base metal itself deteriorates and the strength decreases, or the internal cracks are minute due to expansion and contraction of the base material. Will occur.
Furthermore, when moisture enters the inside from a crack generated on the deteriorated concrete surface, the water may freeze and expand inside, thereby expanding the crack.
Therefore, various methods have been proposed for repairing deteriorated concrete and restoring its strength.
Specifically, Patent Document 1 is known as a method for restoring a deteriorated ALC panel, and Patent Document 2 is known as a repair method for cracks and joints in a concrete structure.

特開昭６４−３９４７１号公報JP-A-64-39471 特開平２−３８７００号公報特許文献１には、老朽化したＡＬＣパネルの劣化表層部に形成したＵ溝内に無機質硬化材を浸透させた後、そのＵ溝をＡＬＣ専用モルタルで埋め戻す方法が記載されている。また、特許文献２には、コンクリート構造物の表面に発生したクラックに沿って溝を切削形成し、その溝内にセメント、エポキシモルタルまたは弾性シーリング材等の充填材を充填する補修方法が記載されている。JP-A-2-38700 discloses a method in which an inorganic hardening material is infiltrated into a U groove formed in a deteriorated surface layer portion of an aging ALC panel, and then the U groove is filled with mortar dedicated to ALC. Are listed. Patent Document 2 describes a repair method in which a groove is cut and formed along a crack generated on the surface of a concrete structure, and a filler such as cement, epoxy mortar, or an elastic sealing material is filled in the groove. ing.

このコンクリートの劣化は、吸音機能を持たせるために多数の連続気孔を内在させた多孔質コンクリート吸音パネルにおいても同様に発生する場合があり、そのコンクリート表面の復元や補修が試みられている。 This deterioration of the concrete may occur in the same way even in a porous concrete sound absorbing panel having a large number of continuous pores in order to provide a sound absorbing function, and attempts have been made to restore and repair the concrete surface.

しかし、多数の連続気孔を内在させた多孔質コンクリート吸音パネル（以下、吸音パネルという。）に、上記文献に記載された方法を単に適用しても、次の問題点がある。
文献１による方法では、無機質硬化材の多量塗布あるいは偏り塗布により、連続気孔の表面にある無数の開口部が塗膜により閉鎖されて吸音性能が著しく低下したり、強度が十分に復元されない部位ができてしまう。
すなわち、独立気泡が内在したＡＬＣパネル（密度４５０〜５５０）に比べて、多数の連続気孔を内在させた吸音パネルでは、その密度が３６０〜４５０と小さく脆弱であるとともに無機質硬化材（強化剤）の浸透性が非常に高くなるため、適量の無機質硬化材（強化剤）を適所に浸透させる必要がある。 However, even if the method described in the above document is simply applied to a porous concrete sound absorbing panel (hereinafter referred to as a sound absorbing panel) having a large number of continuous pores, the following problems arise.
In the method according to Document 1, due to the large-scale application or uneven application of an inorganic curing material, innumerable openings on the surface of the continuous pores are closed by the coating film, so that the sound absorption performance is remarkably lowered or the strength is not sufficiently restored. I can do it.
That is, compared with the ALC panel (density 450 to 550) containing closed cells, the sound absorbing panel containing many continuous pores has a small density of 360 to 450 and is brittle and an inorganic hardening material (strengthening agent). Therefore, it is necessary to allow an appropriate amount of an inorganic curing material (strengthening agent) to permeate in place.

また、文献２による方法は、表面から亀裂部に充填材を充填して接合させることにより、亀裂を補修してさらなる亀裂の拡大を防ぐことができる。しかし、この充填材は接着を目的として使用されるとともに、コンクリート内部にまで浸透しないためコンクリート強度の復元はできない。 Moreover, the method by literature 2 can repair a crack and prevent the expansion of a further crack by filling a crack part from the surface and making it join. However, this filler is used for adhesion and does not penetrate into the concrete, so the concrete strength cannot be restored.

さらに、吸音パネルの場合、多数の連続気孔を有して内部に水が浸透し易いとともに、吸音性能を発揮させるためにはその連続気孔を埋めることができない。そのため、パネル内部への水の侵入および浸透を防ぐ目的でパネル表層部に通常５ｍｍ〜１５ｍｍ厚の撥水層が設けられる。しかし、この撥水層自身は水の侵入がないため劣化しないが、後述するように吸音パネル内部の強度劣化を促進させる結果となってしまう。 Further, in the case of a sound absorbing panel, it has a large number of continuous pores and water easily penetrates into the interior, and the continuous pores cannot be filled in order to exhibit sound absorbing performance. Therefore, a water repellent layer having a thickness of usually 5 mm to 15 mm is provided on the panel surface layer for the purpose of preventing water from entering and penetrating into the panel. However, the water repellent layer itself does not deteriorate because there is no water intrusion, but as a result, the strength deterioration inside the sound absorbing panel is promoted as will be described later.

先に示したコンクリートの劣化はコンクリート中の水分に大きく起因しており、パネル内部に多量の水が浸入または滞留しないようにすることで劣化を抑制することができる。しかし、撥水剤の経年劣化や、振動などの外的要因により撥水層に亀裂が生じた場合、吸音パネル内部に雨水が浸入したり、また、二酸化炭素・酸性雨等の浸入によるコンクリートの中性化や塩化ナトリウムとの反応などにより、撥水層下のコンクリートが膨張・収縮して微細亀裂を生じさせて吸音パネルの強度を劣化させる。
この時、浸入した水がすぐに移動して排出されれば劣化は軽微で済み、かつ強度低下を引き起こすことは少ない。しかし、図１２のように、内部に一旦浸入した水は撥水層によって吸音パネル表面から排水され難くいため、水が長期間内部に滞留するようになり劣化が進行し易くなる。
また、浸入した水は重力に従って連続気孔を通過して吸音パネル下方へ容易に移動して下降していくため、パネル上方に比べてパネル下方部分の内部劣化が著しくなる。 The deterioration of the concrete described above is largely attributed to moisture in the concrete, and the deterioration can be suppressed by preventing a large amount of water from entering or staying inside the panel. However, when the water-repellent layer cracks due to aging deterioration of the water-repellent agent or external factors such as vibration, rainwater infiltrates inside the sound-absorbing panel, or the concrete due to infiltration of carbon dioxide, acid rain, etc. Due to neutralization and reaction with sodium chloride, the concrete under the water-repellent layer expands and contracts, causing microcracks and degrading the strength of the sound absorbing panel.
At this time, if the infiltrated water immediately moves and is discharged, the deterioration is slight and the strength is hardly lowered. However, as shown in FIG. 12, the water that has once entered the interior is difficult to be drained from the surface of the sound absorbing panel by the water repellent layer, so that the water stays in the interior for a long period of time and the deterioration is likely to proceed.
Further, the infiltrated water passes through the continuous pores according to gravity and easily moves and descends below the sound absorbing panel, so that the internal deterioration of the lower portion of the panel becomes significant compared to the upper portion of the panel.

一方、吸音パネルは脆弱であるため、一旦形成された微細な内部亀裂は振動などによりさらに大きな亀裂へと短期間で発展し易い。このため、吸音パネルの耐用年数を向上させるために、この微細な亀裂（幅０．１ｍｍ以下）が発生した段階で吸音パネル内部の母材強度を復元させておくことが重要となる。
さらに、表層部に撥水層が形成された吸音パネルは、溝を単に形成して強化剤を塗布してもその溝が撥水層より下層へ達していないと、強化剤が内部へ浸透しないという問題があった。
そこで、本発明の目的は上記問題点を解決して、吸音性能を低下させないで、吸音パネル内部の母材の強度を復元させる多孔質コンクリート吸音パネルの補修方法を提供することにある。 On the other hand, since the sound-absorbing panel is fragile, a fine internal crack once formed easily develops into a larger crack in a short period due to vibration or the like. For this reason, in order to improve the service life of the sound-absorbing panel, it is important to restore the strength of the base material inside the sound-absorbing panel when this fine crack (width 0.1 mm or less) occurs.
Furthermore, in a sound-absorbing panel having a water-repellent layer formed on the surface layer portion, even if a groove is simply formed and a reinforcing agent is applied, the reinforcing agent does not penetrate into the interior unless the groove reaches the lower layer than the water-repellent layer. There was a problem.
Accordingly, an object of the present invention is to provide a method for repairing a porous concrete sound absorbing panel that solves the above problems and restores the strength of the base material inside the sound absorbing panel without deteriorating the sound absorbing performance.

前記課題を解決するために、
本発明は、直径０．３〜２ｍｍの気孔が直径０．１〜１ｍｍの連通孔により連結して形成される連続気孔の総容積がパネル全体積の３０％以上を占めているとともに、所定厚さの撥水層がパネル表層に形成されている多孔質コンクリート吸音パネルの内部補修方法において、
この多孔質コンクリート吸音パネルの音源側表面に前記撥水層を通過させた注入凹部を所定間隔離間させて穿設し、その音源側表面３６００ｃｍ²当たりにその有効成分が１０〜１００ｇとなるように浸透性水系強化剤を前記注入凹部に分散させて注入する補修方法とした。
さらに、以下の要件を好ましい条件とした。
１）多孔質コンクリート吸音パネルは水平面に立設された吸音壁を形成しており、パネル中央より上側半分に注入する浸透性水系強化剤の注入量（Ａ）と、下側半分に注入する浸透性水系強化剤の注入量（Ｂ）とが、Ｂ／（Ａ＋Ｂ）≧０．８とする。
２）注入凹部はその開口部形状が直径５ｍｍ〜５０ｍｍの円形であり、かつその深さは１５ｍｍ〜４０ｍｍとする。
３）浸透性水性強化剤は、ケイ酸アルカリ水溶液とする。
４）ケイ酸アルカリ水溶液は、ケイ酸リチウム水溶液とする。
５）浸透性水系強化剤を注入凹部に分散させて注入した後に、注入凹部をパネル受音側表面へ貫通させる。
６）浸透性水系強化剤を注入凹部に分散させて注入した後に、注入凹部のパネル音源側表面の開口部を充填材により閉塞する。 In order to solve the above problem,
In the present invention, the total volume of continuous pores formed by connecting pores having a diameter of 0.3 to 2 mm by communication holes having a diameter of 0.1 to 1 mm occupies 30% or more of the total panel volume, and has a predetermined thickness. In the internal repair method of the porous concrete sound-absorbing panel in which the water-repellent layer is formed on the panel surface layer,
Injecting recesses through which the water-repellent layer has passed are formed on the sound source side surface of the porous concrete sound absorbing panel so as to be spaced apart by a predetermined distance so that the active ingredient is 10 to 100 g per 3600 cm ^{2 of} the sound source side surface. A repairing method in which a permeable water-based reinforcing agent is dispersed in the injection recess and injected.
Furthermore, the following requirements were set as preferable conditions.
1) The porous concrete sound absorbing panel forms a sound absorbing wall erected on the horizontal plane. The amount of penetrating water-based reinforcing agent (A) injected into the upper half from the center of the panel and the penetration injected into the lower half. The injection amount (B) of the water-based reinforcing agent is B / (A + B) ≧ 0.8.
2) The injection recess has a circular shape with a diameter of 5 mm to 50 mm and a depth of 15 mm to 40 mm.
3) The permeable aqueous strengthening agent is an alkali silicate aqueous solution.
4) The alkaline silicate aqueous solution is a lithium silicate aqueous solution.
5) After the permeable water-based reinforcing agent is dispersed and injected in the injection recess, the injection recess is penetrated to the panel sound receiving side surface.
6) After the permeable water-based reinforcing agent is dispersed and injected into the injection recess, the opening on the panel sound source side surface of the injection recess is closed with a filler.

本発明によれば、雨水等の浸透性が非常に高いとともに内部亀裂が拡大し易い吸音パネルであっても、適量の強化剤を適所に浸透させることにより吸音パネルの吸音率を低下させることがなく、その耐用年数を延ばすことが可能となる。 According to the present invention, it is possible to reduce the sound absorption rate of a sound absorbing panel by penetrating an appropriate amount of a reinforcing agent at an appropriate position even if the sound absorbing panel has extremely high permeability such as rainwater and internal cracks are likely to expand. It is possible to extend the useful life.

以下、本発明の実施形態を図１〜図１１に基づいて説明する。なお、符号は従来例と同一のものはその符号を付した。また、図１〜８に示すように、本発明における吸音パネル１が水平面に立設された状態での補修方法に基づいて説明する。
本発明は、直径０．３〜２ｍｍの気孔２が直径０．１〜１ｍｍの連通孔４により連結して形成される連続気孔３（図１０参照）の総容積がパネル全体積の３０％以上を占めているとともに、所定厚さの撥水層５がパネル表層に形成（図１参照）されている多孔質コンクリート吸音パネル１の内部補修方法である。
ここでいう連続気孔３とは、吸音パネル１の任意切断面において気孔２が連通孔４により数珠状に３つ以上連通しているものをいう。
具体的には、図１１に示すような連続気孔３がある。
すなわち、３ａ：３つの気孔断面が連通孔４により連続している、３ｂ：気孔断面は1つであるが、その奥に２つ以上の気孔が連通孔４により連通している。３ｃ：気孔断面は２つであるが、その奥に１つ以上の気孔が連通している、３ｄ：気孔断面が３つ以上連通しているとともにその奥に別の気孔が連通している。
さらに、これ以外にも気孔３が３つ以上連通している形態は多数考えられるため、この図示には限定されない。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. In addition, the code | symbol attached | subjected the code | symbol same as a prior art example. Moreover, as shown in FIGS. 1-8, it demonstrates based on the repair method in the state in which the sound-absorbing panel 1 in this invention was standingly arranged in the horizontal surface.
In the present invention, the total volume of continuous pores 3 (see FIG. 10) formed by connecting pores 2 having a diameter of 0.3 to 2 mm by communication holes 4 having a diameter of 0.1 to 1 mm is 30% or more of the total panel volume. And a water repellent layer 5 having a predetermined thickness is formed on the surface of the panel (see FIG. 1).
Here, the continuous pores 3 are those in which three or more pores 2 communicate with each other in a bead shape through the communication holes 4 on the arbitrarily cut surface of the sound absorbing panel 1.
Specifically, there are continuous pores 3 as shown in FIG.
That is, 3a: three pore cross sections are continuous by the communication holes 4, 3b: one pore cross section, but two or more pores are communicated by the communication holes 4 at the back. 3c: Although there are two pore cross sections, one or more pores communicate with the back thereof. 3d: Three or more pore cross sections communicate with each other and another pore communicates therewith.
In addition, many other forms in which three or more pores 3 communicate with each other are conceivable, and the present invention is not limited to this illustration.

そして、本発明の補修の方法は、吸音パネル１の音源側表面にシリコーン系撥水剤等の塗布により形成された撥水層５を通過する深さまで注入凹部６を所定間隔離間させて穿設した後に、その注入凹部６に浸透性水性強化剤７を分散させて注入する。
このとき、注入凹部６は撥水層５を通過する深さまで穿孔することが必要である。撥水層５を通過する深さまで注入凹部６が穿孔されていると、注入された浸透性水性強化剤７が撥水層５より下の吸音パネル１の内部へ容易に浸透していくようになる。
この注入凹部６の深さは、通常の撥水剤により形成される撥水層５の厚みを超える（音源側表面から）１５ｍｍ以上が好ましく、また、吸音パネル全体に浸透性水性強化剤７が均等に分散されるためにパネル厚さから１０ｍｍ以上差し引いた値（受音側表面から内部へ１０ｍｍ以上）までとすることが好ましい。
また、注入凹部６同士の離間距離は、次に述べる注入凹部６に注入する浸透性水性強化剤７の注入量と関連して設定される。
すなわち、吸音パネル１の音源側表面３６００ｃｍ²（単位面積１０）当たりに浸透性水系強化剤７の有効成分が１０〜１００ｇとなるように注入凹部６に分散させて注入する必要がある。 In the repair method of the present invention, the injection recess 6 is formed on the sound source side surface of the sound absorbing panel 1 at a predetermined interval to a depth that passes through the water repellent layer 5 formed by application of a silicone water repellent or the like. After that, the permeable aqueous reinforcing agent 7 is dispersed and injected into the injection recess 6.
At this time, the injection recess 6 needs to be drilled to a depth that passes through the water-repellent layer 5. When the injection recess 6 is perforated to a depth that passes through the water repellent layer 5, the injected permeable aqueous reinforcing agent 7 can easily penetrate into the sound absorbing panel 1 below the water repellent layer 5. Become.
The depth of the injection recess 6 is preferably 15 mm or more (from the sound source side surface) exceeding the thickness of the water repellent layer 5 formed by a normal water repellent, and the permeable aqueous reinforcing agent 7 is disposed on the entire sound absorbing panel. In order to uniformly disperse, it is preferable that the panel thickness is a value obtained by subtracting 10 mm or more (10 mm or more from the sound receiving side surface to the inside).
The distance between the injection recesses 6 is set in relation to the injection amount of the permeable aqueous reinforcing agent 7 to be injected into the injection recess 6 described below.
That is, it is necessary to disperse and inject into the injection recess 6 so that the active ingredient of the permeable water-based reinforcing agent 7 is 10 to 100 g per 3600 cm ² (unit area 10) of the sound source side surface of the sound absorbing panel 1.

例えば、図２に示すように、吸音パネル１の音源側表面を単位面積１０（３６００ｃｍ^２）以下の四角形（一点鎖線で囲まれた部分）で６分割する。そして、単位面積１０（３６００ｃｍ^２）当たりに注入される浸透性水系強化剤７の有効成分が１０〜１００ｇとなるように、その単位面積１０の領域内に１つ以上の注入凹部６を穿設する。図２では、単位面積１０の中央に注入凹部６を１つ設けて浸透性水性強化剤７の必要量を重点的に注入したが、単位面積１０内に複数個の注入凹部６を設けて浸透性水性強化剤７をそれぞれに分散させて注入することも可能である。このとき、単位面積１０当たりに２〜４個の注入凹部６を設けると、浸透性水性強化剤７を吸音パネル全体に分散・浸透させることができて好ましい。また、作業効率面から注入凹部６を２個とすることが望ましい。また、図３では、吸音パネル１の上側半分の単位面積１０にはその上方に注入凹部６を１つ設けて浸透性水性強化剤７の必要量を重点的に注入し、また、下側半分の単位面積１０にはその下方に注入凹部６を１つ設けて浸透性水性強化剤７の必要量を重点的に注入した。 For example, as shown in FIG. 2, the sound source side surface of the sound absorbing panel 1 is divided into six rectangles (portions surrounded by a one-dot chain line) having a unit area of 10 (3600 cm ² ) or less. And one or more injection | pouring recessed parts 6 are drilled in the area | region of the unit area 10 so that the active ingredient of the permeable water type | system | group reinforcement | strengthening agent 7 inject | poured per unit area 10 (3600cm < ² >) may be 10-100g. To do. In FIG. 2, one injection recess 6 is provided in the center of the unit area 10 to inject the necessary amount of the permeable aqueous reinforcing agent 7, but a plurality of injection recesses 6 are provided in the unit area 10 to infiltrate. It is also possible to inject the water-based aqueous strengthening agent 7 in a dispersed manner. At this time, it is preferable to provide 2 to 4 injection recesses 6 per unit area 10 because the permeable aqueous reinforcing agent 7 can be dispersed and permeated throughout the sound absorbing panel. Further, it is desirable that the number of the injection recesses 6 is two from the viewpoint of work efficiency. Further, in FIG. 3, the upper half unit area 10 of the sound-absorbing panel 1 focuses injecting the required amount of penetration aqueous reinforcing agent 7 is provided one note enter recesses 6 in its upper and lower A half of the unit area 10 was provided with one injection recess 6 below it, and the required amount of the permeable water-based reinforcing agent 7 was mainly injected.

一辺が６０ｃｍの正方形で囲まれた領域を単位面積１０（３６００ｃｍ²）とし、その領域内に注入される浸透性水系強化剤７の有効成分を１０〜１００ｇとすることにより浸透性水系強化剤７の量の管理が容易であるとともに作業性も良い。浸透性水系強化剤７の有効成分を１０ｇ以上とすることにより十分なパネル強度の復元が可能となり、また１００ｇ以下とすることにより吸音性能を低下させることなくパネル強度を復元させる。 A region surrounded by a square having a side of 60 cm is a unit area 10 (3600 cm ² ), and the active ingredient of the permeable water-based reinforcing agent 7 injected into the region is 10 to 100 g. Is easy to manage and good workability. By making the active ingredient of the permeable water-based reinforcing agent 7 10 g or more, sufficient panel strength can be restored, and by making it 100 g or less, the panel strength is restored without deteriorating the sound absorption performance.

注入凹部６は、図２に示すように、開口部が円形の円筒凹部であっても長尺な溝状凹部であっても良い。穴開け・注入の施工性および浸透性水性強化剤７の注入後の分散効率から、注入凹部６はその開口部が直径５ｍｍ〜５０ｍｍの円形であり、かつその深さは１５ｍｍ〜４０ｍｍであると好ましい。 As shown in FIG. 2, the injection recess 6 may be a cylindrical recess having a circular opening or a long groove recess. From the workability of drilling / injection and the dispersion efficiency after injection of the osmotic aqueous reinforcing agent 7, the injection recess 6 has a circular shape with a diameter of 5 to 50 mm and a depth of 15 to 40 mm. preferable.

浸透性水性強化剤７の有効成分とは、水分を除いた強化剤としての有効となる成分である。
浸透性水性強化剤７として、アクリル樹脂、スチレンアクリル樹脂などの水系アクリル樹脂や水系ケイ酸アルカリが採用できる。
これらの浸透性水性強化剤７の有効成分とは、水分を除いた樹脂成分またはケイ酸アルカリ成分であり、単位面積１０（３６００ｃｍ²）当たりに１０〜１００ｇ注入すると、吸音パネル１の強度が復元するとともに吸音性能の低下も生じない。
注入された浸透性水性強化剤７は、図４に示すように、コンクリート内部組織に拡散して浸透することにより、微細亀裂に充填されて組織を再結合させたり、コンクリート中の遊離石灰（Ｃａ（ＯＨ）₂）や不定形シリカ（ＳｉＯ_n）と反応して、水隙や空隙内で緻密化した疎水性無機化合物を形成させたりして、吸音パネル１の強度を復元させる。
図４は吸音パネル１が立設された状態であるため、それぞれの注入凹部６に注入された浸透性水性強化剤７はパネル内部に拡散するとともに下方に浸透していく。 The active ingredient of the osmotic aqueous reinforcing agent 7 is an effective component as a reinforcing agent excluding moisture.
As the permeable aqueous reinforcing agent 7, an aqueous acrylic resin such as an acrylic resin or a styrene acrylic resin or an aqueous alkali silicate can be used.
The active ingredient of these permeable aqueous reinforcing agents 7 is a resin component or an alkali silicate component excluding moisture, and when 10 to 100 g is injected per unit area 10 (3600 cm ² ), the strength of the sound absorbing panel 1 is restored. In addition, the sound absorption performance is not degraded.
As shown in FIG. 4, the injected permeable aqueous reinforcing agent 7 diffuses and penetrates into the internal structure of the concrete, thereby filling the fine cracks to recombine the structure, or free lime (Ca in the concrete) The strength of the sound-absorbing panel 1 is restored by reacting with (OH) ₂ ) or amorphous silica (SiO _n ) to form a hydrophobic inorganic compound densified in the water gap or void.
Since FIG. 4 shows the state in which the sound absorbing panel 1 is erected, the permeable aqueous reinforcing agent 7 injected into each injection recess 6 diffuses into the panel and penetrates downward.

水系ケイ酸アルカリの浸透性水性強化剤７は、酸性雨や二酸化炭酸ガスにより中性化したコンクリートをアルカリ性に回復させる効果もある。これにより、吸音パネル１の強度を復元できるとともに、埋設補強筋の錆の発生も防止する効果を発揮する。
さらに、ケイ酸リチウムはその金属イオンが十分に小さいため、吸音性能を発揮する気孔をその塗膜で全く閉鎖しないとともに、より緻密な亀裂にまで浸透して疎水性無機化合物（ＣａＳｉＯ₃）を生成して吸音パネル１の強度を十分に復元させるとともに、ＣａＳｉＯ₃が組織を被覆して耐水性を向上させる。
また、浸透性水性強化剤７の粘度が１２０ｃｐ以下であると、コンクリート組織に浸透し易いため好ましく、１０ｃｐ以下であるとより細部の微細亀裂まで十分に浸透するため望ましい。 The water-based alkali silicate permeable aqueous reinforcing agent 7 also has an effect of restoring the concrete neutralized by acid rain or carbon dioxide gas to alkalinity. Thereby, while the intensity | strength of the sound-absorbing panel 1 can be restored | restored, the effect which prevents generation | occurrence | production of the rust of a buried reinforcing bar is exhibited.
In addition, since the metal ions of lithium silicate are sufficiently small, the pores that exhibit sound absorption performance are not closed at all by the coating film, and penetrate into even finer cracks to form a hydrophobic inorganic compound (CaSiO ₃ ). Thus, the strength of the sound-absorbing panel 1 is sufficiently restored, and the CaSiO ₃ covers the structure to improve the water resistance.
Moreover, since it is easy to osmose | permeate a concrete structure as the viscosity of the permeable aqueous | water-based toughening agent 7 is 120 cp or less, it is desirable in order to fully infiltrate to a fine crack of a detail more than 10 cp.

図５に示すように、浸透性水系強化剤７を注入した後に注入凹部６をパネル受音側表面
（図中右側）へ貫通させると、上記補修後の吸音パネル１に雨水等が再度浸透しても、その水が滞留することがなく容易に排水されるためコンクリート内部の劣化の進行を遅らせることができるようになる。このとき、パネル受音側表面は雨水がパネル表面に直接かからない状態であることが望ましい。
立設する吸音パネル１の場合、図５に示すように、パネル下方の注入凹部６ａを貫通させることにより、吸音パネル１に全体に浸透した水を効率よく排水することができる。 As shown in FIG. 5, when the permeable water-based reinforcing agent 7 is injected and the injection recess 6 is penetrated to the panel sound-receiving side surface (right side in the figure), rainwater or the like permeates the sound-absorbing panel 1 after repair again. However, since the water is easily drained without stagnation, the progress of deterioration inside the concrete can be delayed. At this time, it is desirable that the panel sound receiving surface is in a state in which rainwater does not directly reach the panel surface.
In the case of the sound-absorbing panel 1 standing upright, as shown in FIG. 5, water penetrating the sound-absorbing panel 1 as a whole can be efficiently drained by passing through the injection recess 6 a below the panel.

また、図６に示すように、浸透性水系強化剤７を注入凹部６に分散させて注入した後に、注入凹部６のパネル音源側表面の開口部を充填材８により閉塞させると、吸音パネル１の表面が平滑となり見栄えが良いとともに、吸音パネルの音源側からの雨水の浸入を防ぐことができる。
立設する吸音パネル１の下方で貫通させた注入凹部６ａにおいては、前記効果が得られるほかに、受音側表面の開口部が閉塞されていないため排水機能が維持できて好ましい。
充填剤８としては、コンクリートモルタル、またはシリコーン系などのシーリング材が使用でき、施工性、耐水性の面から補修用に調合された速乾性のモルタルが好ましい。また、ゴム栓などにより注入凹部６を塞ぐ方法も考えられる。
なお、充填材の充填後はその表面に撥水剤を塗布しておくと良い。 Further, as shown in FIG. 6, when the permeable water-based reinforcing agent 7 is dispersed and injected into the injection recess 6, and then the opening on the panel sound source side surface of the injection recess 6 is closed with the filler 8, the sound absorbing panel 1. The surface of the panel is smooth and looks good, and rainwater can be prevented from entering from the sound source side of the sound absorbing panel.
The injection recess 6a penetrated below the standing sound absorbing panel 1 is preferable because the above effect can be obtained and the drainage function can be maintained because the opening on the sound receiving side surface is not closed.
As the filler 8, a concrete mortar or a sealing material such as silicone can be used, and a quick-drying mortar prepared for repair is preferable in terms of workability and water resistance. A method of closing the injection recess 6 with a rubber stopper or the like is also conceivable.
In addition, it is good to apply a water repellent to the surface after filling the filler.

また、吸音パネル１が水平面に立設された状態であると、図１２および図４に示すように、浸透した雨水が滞留して劣化が進み易いパネル下方に、浸透性水性強化剤７も同様に重点的に浸透していく。
そして、吸音パネル１の中央より上側半分に注入する浸透性水系強化剤７の注入量（Ａ）と、下側半分に注入する浸透性水系強化剤７の注入量（Ｂ）とが、Ｂ／（Ａ＋Ｂ）≧０．８となるように分散させて浸透性水系強化剤７を注入すると、劣化が進行したパネル下側に浸透性水系強化剤７が重点的に注入されて浸透・拡散されるため、少ない浸透性水系強化剤７であっても有効に効率よくパネル強度が復元される。 Further, when the sound absorbing panel 1 is in a standing state on a horizontal plane, as shown in FIG. 12 and FIG. Will focus on.
Then, the injection amount (A) of the permeable aqueous reinforcing agent 7 injected into the upper half from the center of the sound absorbing panel 1 and the injection amount (B) of the permeable aqueous reinforcing agent 7 injected into the lower half are B / When the osmotic aqueous strengthening agent 7 is injected so as to be dispersed so that (A + B) ≧ 0.8, the osmotic aqueous reinforcing agent 7 is mainly injected and penetrated / diffused under the panel where the deterioration has progressed. Therefore, even with a small amount of permeable water-based reinforcing agent 7, panel strength can be restored effectively and efficiently.

以下、本発明の実施例および比較例を説明する。
ケイ酸質原料として珪石粉末５１重量％、石灰質原料として早強セメント４７重量％、石膏２重量％からなる固形分１００重量％を主原料とし、これに対してＡＬＣの水蒸気養生処理前の半硬化物５重量％と水７８重量％、発泡剤として金属アルミニウム粉末０．１２重量％、そして増粘剤としてメチルセルロース０．４重量％、界面活性剤としてポリオキシエチレンアルキルエーテル硫酸トリエタノールアミン０．５重量％を添加して均一に混合攪拌して原料スラリーを生成する。
そして、各吸音パネルに埋設されるメタルラスが９０枚配設された型枠内（長さ６ｍ、幅１．５ｍ、高さ０．７ｍ）に前記原料スラリーを注入して発泡・半硬化状態となるまで養生し、その半硬化体を各吸音パネル（長さ：１８００ｍｍ、幅：６００ｍｍ、厚さ：５０ｍｍ、枚数：９０枚）の大きさにピアノ線で切断する。
さらに、この半硬化体を温度１８０℃、圧力１０気圧で４時間水蒸気養生することにより、直径０．３〜２ｍｍの気孔が直径０．１〜１ｍｍの連通孔により連結して形成される連続気孔の総容積がパネル全体の３０％以上を占める多孔質コンクリート吸音パネルが得られる。 Examples of the present invention and comparative examples will be described below.
The main raw material consists of 51% by weight of silica powder as a siliceous material, 47% by weight of early strength cement as a calcareous raw material, and 100% by weight of solids consisting of 2% by weight of gypsum. 5% by weight of product and 78% by weight of water, 0.12% by weight of metal aluminum powder as a foaming agent, 0.4% by weight of methylcellulose as a thickening agent, 0.5% triethanolamine sulfate as polyoxyethylene alkyl ether sulfate A weight percent is added and mixed and stirred uniformly to produce a raw slurry.
Then, the raw material slurry is injected into a mold (length 6 m, width 1.5 m, height 0.7 m) in which 90 metal laths embedded in each sound absorbing panel are disposed, and a foamed / semi-cured state is obtained. The semi-cured body is cut to a size of each sound absorbing panel (length: 1800 mm, width: 600 mm, thickness: 50 mm, number of sheets: 90) with a piano wire.
Further, the semi-cured body is steam-cured at a temperature of 180 ° C. and a pressure of 10 atm for 4 hours, whereby continuous pores formed by connecting pores having a diameter of 0.3 to 2 mm with communication holes having a diameter of 0.1 to 1 mm. A porous concrete sound-absorbing panel having a total volume of 30% or more of the entire panel is obtained.

この得られた吸音パネルの全表面（６面）にシラン系の撥水剤を２００ｇ／ｍ²噴霧し、パネル表層部に７〜１０ｍｍ厚の撥水層を形成させた。
そして、これらの吸音パネルの音源側となる表面に撥水層５を貫く傷を形成し、長辺小口面を床面として吸音パネルを立設させるとともに雨水が内部に侵入する状態で屋外に２年間曝露させた。そして、パネル内部のブリネル硬度が０．１５Ｎ／ｍｍ²となって劣化した吸音パネルを用いて、次に示す実施例および比較例を行った。
実施例１〜３および比較例１〜４に示す各条件で浸透性水性強化剤７を吸音パネル内部に注入して、その浸透性水性強化剤７の吸音パネル内部への浸透性、吸音パネルの強度、吸音パネルの垂直入射吸音率を下記方法により計測・評価して、その結果を表１に示した。 A silane-based water repellent was sprayed at 200 g / m ^{2 on} the entire surface (six sides) of the obtained sound absorbing panel to form a 7 to 10 mm thick water repellent layer on the panel surface.
Then, a scratch penetrating the water repellent layer 5 is formed on the sound source side surface of these sound absorbing panels, the sound absorbing panel is erected with the long side edge surface as the floor surface, and rainwater enters the outside 2 Exposed for a year. Then, the following examples and comparative examples were carried out using the sound-absorbing panel deteriorated with the Brinell hardness inside the panel being 0.15 N / mm ² .
In each of the conditions shown in Examples 1 to 3 and Comparative Examples 1 to 4, the permeable aqueous reinforcing agent 7 was injected into the sound absorbing panel, and the permeable aqueous reinforcing agent 7 penetrated into the sound absorbing panel. The strength and the normal incident sound absorption coefficient of the sound absorbing panel were measured and evaluated by the following methods, and the results are shown in Table 1.

（浸透性の評価方法）
各実施例および比較例において、赤色の染料で予め着色した浸透性水性強化剤７を注入凹部６に注入して３日間静置させたのち、吸音パネルの下方小口面から上方へ１００ｍｍおよび２００ｍｍの２つの位置で長手方向にパネルを水平切断し、その切断面における着色状況によって浸透性水性強化剤７が十分に浸透しているか否かを評価した。
すなわち、２つの切断面において、ともに撥水層断面以外が全て赤色に着色されていれば〇、着色されていない部分が一部でもあれば×とした。 (Permeability evaluation method)
In each of the examples and comparative examples, the permeable aqueous reinforcing agent 7 pre-colored with a red dye was injected into the injection recess 6 and allowed to stand for 3 days, and then 100 mm and 200 mm upward from the lower edge of the sound absorbing panel. The panel was horizontally cut in the longitudinal direction at two positions, and it was evaluated whether or not the permeable aqueous reinforcing agent 7 was sufficiently permeated depending on the coloration state on the cut surface.
That is, in the two cut surfaces, both of the sections other than the cross-section of the water-repellent layer were colored red, and ◯ was marked if there were some uncolored portions.

（強度の評価方法）
各実施例および比較例において、浸透性水性強化剤７を注入凹部６に注入して３日間静置させたのち、吸音パネルの音源側表面から１５ｍｍの厚み（撥水層部分）を切り落とす。そして、床面側から上方へ２００ｍｍの位置から試験体（６個：パネル長手方向の７等分点）を抽出して、ＪＩＳ Z ２２４３に準じてブリネル硬度を測定した。
具体的には、インストロン社製の圧縮試験機を用いて、直径１６ｍｍの球圧子を加圧速度０．２ｍｍ／ｍｉｎ、最大荷重２００Ｎで試験体を加圧し、各試験体に残った圧痕直径よりブリネル硬度を測定してそれらの平均値とした。そして、浸透性水性強化剤７が注入されていない状態の劣化した吸音パネル（０．１５Ｎ／ｍｍ²）に比べて、ブリネル硬度が０．３０Ｎ／ｍｍ²以上となり強度が２倍以上となった吸音パネルを〇、それ以下のものは×とした。 (Strength evaluation method)
In each of the examples and comparative examples, the permeable aqueous reinforcing agent 7 was injected into the injection recess 6 and allowed to stand for 3 days, and then a 15 mm thickness (water repellent layer portion) was cut off from the sound source side surface of the sound absorbing panel. Then, specimens (six pieces: seven equally divided points in the longitudinal direction of the panel) were extracted from the position of 200 mm upward from the floor side, and the Brinell hardness was measured according to JIS Z 2243.
Specifically, using a compression testing machine manufactured by Instron, a ball indenter with a diameter of 16 mm was pressed at a pressing speed of 0.2 mm / min and a maximum load of 200 N, and the indentation diameter remaining on each test body. The Brinell hardness was measured to obtain an average value thereof. The Brinell hardness was 0.30 N / mm ² or more and the strength was more than doubled compared to the deteriorated sound absorbing panel (0.15 N / mm ² ) in the state where the permeable water reinforcing agent 7 was not injected. Sound absorbing panels were marked with ◯, and those with less than that were marked with ×.

（吸音率の測定方法）
各実施例および比較例において、浸透性水性強化剤７を注入凹部６に注入して３日間静置させたのち、下方小口面から上方へ２００ｍｍの中央部から直径１００ｍｍの円筒形の試験体を抜き取り、ＪＩＳＡ１４０５に準じて垂直入射吸音率を測定した。そして、その試験体の垂直入射吸音率が８００Ｈｚで０．７以上かつ１０００Ｈｚで０．６以上の吸音パネルをと〇、それ以下は×とした。 (Measurement method of sound absorption coefficient)
In each of the examples and comparative examples, the osmotic aqueous reinforcing agent 7 was injected into the injection recess 6 and allowed to stand for 3 days, and then a cylindrical test body having a diameter of 100 mm was formed from the center of 200 mm upward from the lower fore edge surface. The sample was extracted and the normal incident sound absorption coefficient was measured according to JIS A 1405. A sound absorption panel having a normal incident sound absorption coefficient of 0.7 or more at 800 Hz and 0.6 or more at 1000 Hz was marked with ◯, and less than that.

［実施例１］
長辺小口面を床面として立設させた吸音パネル（長さ１８００ｍｍ、幅６００ｍｍ、厚さ５０ｍｍ）の図７に示す表面位置（パネル上端から１５０ｍｍで両側端から２２５ｍｍまたは注入凹部の間隔が４５０ｍｍとなる位置）に、電動ドリルを用いて注入孔６（直径１５ｍｍ、深さ３０ｍｍ）を４個穿孔し、有効成分１２０ｇのスチレンアクリル樹脂系強化剤（製品名：ニカゾールＲＸ−３００２、日本カーバイド工業社製）を水で１２００ｇに希釈した浸透性水性強化剤７を各注入孔６へ均等に３００ｇ（有効成分１５ｇ）ずつ注入して３日間静置した。
その評価結果は表１に示すように、浸透性水性強化剤７が吸音パネル内部に十分に浸透していたとともにパネル強度も十分に復元した。なお、吸音率について若干の低下が見られたが、吸音性能として損傷のない数値であった。 [Example 1]
The surface position shown in FIG. 7 of the sound-absorbing panel (length 1800 mm, width 600 mm, thickness 50 mm) standing upright with the small edge of the long side as the floor surface (150 mm from the upper end of the panel and 225 mm from both ends, or the spacing between the injection recesses is 450 mm) 4) Injection holes 6 (diameter 15 mm, depth 30 mm) are drilled at a position where the styrene-acrylic resin is strengthened (product name: Nicazole RX-3002, Nippon Carbide Industries). An osmotic aqueous reinforcing agent 7 diluted with water to 1200 g was injected into each injection hole 6 in an amount of 300 g (15 g of active ingredient) and allowed to stand for 3 days.
As shown in Table 1, the results of the evaluation showed that the permeable aqueous reinforcing agent 7 was sufficiently penetrated into the sound absorbing panel and the panel strength was sufficiently restored. In addition, although a slight fall was seen about the sound absorption rate, it was a numerical value with no damage as sound absorption performance.

[実施例２]
実施例１と同様に、図７に示す位置に４個穿孔した吸音パネルの各注入孔６（直径１５ｍｍ、深さ３０ｍｍ）に、有効成分１２０ｇのケイ酸リチウム系強化剤（製品名：ＲＦ−１００、太平洋マテリアル社製）を水で１２００ｇに希釈した浸透性水性強化剤７を均等に３００ｇ（有効成分３０ｇ）ずつ注入して３日間静置した。その評価結果は表１に示すように、浸透性水性強化剤７が吸音パネル内部に十分に浸透していたとともにパネル強度も十分に復元した。また、吸音率についても十分な結果が得られた。 [Example 2]
In the same manner as in Example 1, each of the injection holes 6 (diameter 15 mm, depth 30 mm) of the sound absorbing panel 4 perforated at the position shown in FIG. 100, and allowed to stand Pacific Ocean material Co., Ltd.) was injected by equally permeable water toughener 7 diluted to 1200g with water 300 g (active ingredient 30 g) 3 days. As shown in Table 1, the results of the evaluation showed that the permeable aqueous reinforcing agent 7 was sufficiently penetrated into the sound absorbing panel and the panel strength was sufficiently restored. Moreover, sufficient results were obtained for the sound absorption coefficient.

［実施例３］
長辺小口面を床面として立設させた吸音パネル（長さ１８００ｍｍ、幅６００ｍｍ、厚さ５０ｍｍ）の図８に示す表面位置（パネル上端または下端から１５０ｍｍで両側端から２２５ｍｍまたは注入凹部の間隔が４５０ｍｍとなる位置）に、電動ドリルを用いて注入孔６（直径１５ｍｍ、深さ３０ｍｍ）を上方下方ともに各４個穿孔する。
そして、有効成分６０ｇのケイ酸リチウム系強化剤（製品名：ＲＦ−１００、太平洋マテリアル社製）を水で１２００ｇに希釈した浸透性水性強化剤７を各注入孔６に（上方は各穴に４０ｇ（有効成分２ｇ）ずつ、下方の各穴に２６０ｇ（有効成分１３ｇ）ずつそれぞれ均等に注入する。
これにより、上方の４個の注入孔６にはそれぞれ有効成分２ｇずつ注入して、吸音パネル１の中央より上側半分に注入する浸透性水系強化剤７の有効成分の注入量（Ａ）を８ｇとし、下方の４個の注入孔６にはそれぞれ有効成分１３ｇずつ注入して下側半分に注入する浸透性水系強化剤７の有効成分の注入量（Ｂ）を５２ｇとなる。
すなわち、Ｂ／（Ａ＋Ｂ）＝０．８６≧０．８となって浸透性水系強化剤７が分散させて注入される。
その評価結果は表１に示すように、上側位置（上端から下方へ２００ｍｍ）および下側位置（下端から上方へ２００ｍｍ）のブルネル硬度は、それぞれ０．３４Ｎ／ｍｍ²および０．３７Ｎ／ｍｍ²以なった。このように、浸透性水性強化剤７が吸音パネル内部に十分に浸透していたとともにパネル強度も十分に復元した。
また、吸音率についても十分な結果が得られた。さらに、浸透性水性強化剤７が吸音パネル内部、特に下方へ適切かつ効率的に浸透されていた。 [Example 3]
The surface position shown in FIG. 8 of the sound absorption panel (length 1800 mm, width 600 mm, thickness 50 mm) standing on the floor with the long edge as the floor surface (150 mm from the top or bottom of the panel, 225 mm from both ends, or the spacing between the injection recesses) 4 holes each in the upper and lower directions using an electric drill at a position where the diameter becomes 450 mm.
Then, an osmotic aqueous reinforcing agent 7 obtained by diluting 60 g of an active ingredient lithium silicate-based reinforcing agent (product name: RF-100, manufactured by Taiheiyo Materials Co., Ltd.) to 1200 g with water is provided in each injection hole 6 (the upper part is in each hole). Inject 40 g (2 g of active ingredient) equally into each lower hole by 260 g (13 g of active ingredient).
In this way, 2 g of active ingredient is injected into each of the upper four injection holes 6 and the injection amount (A) of the active ingredient of the permeable water-based reinforcing agent 7 injected into the upper half from the center of the sound absorbing panel 1 is 8 g. The injection amount (B) of the active ingredient of the osmotic water-based reinforcing agent 7 injected into the lower four injection holes 6 by 13 g each and then injected into the lower half is 52 g.
That is, B / (A + B) = 0.86 ≧ 0.8 and the permeable water-based reinforcing agent 7 is dispersed and injected.
The evaluation results are as shown in Table 1, Brunel hardness of the upper position and the lower position (the upper end downwardly to 200mm from) (200mm from the bottom upwards), respectively 0.34 N / mm ² and 0.37 N / mm ² That's it. Thus, the permeable water-based reinforcing agent 7 was sufficiently penetrated into the sound absorbing panel and the panel strength was sufficiently restored.
Moreover, sufficient results were obtained for the sound absorption coefficient. Further, the permeable aqueous reinforcing agent 7 was appropriately and efficiently permeated into the sound absorbing panel, particularly downward.

［比較例１］
実施例１と同様に立設させた吸音パネルの図７に示す表面位置に、電動ドリルを用いて注入孔６（直径１５ｍｍ、深さ５ｍｍ）を４個穿孔した。
そして、有効成分１２０ｇのケイ酸リチウム系強化剤を水で１２００ｇに希釈した浸透性水性強化剤７を各注入孔６へ均等に注入しようとした。しかし、注入孔６の深さが十分ではなく撥水層５を通過していないため、浸透性水性強化剤７は吸音パネル内部にほとんど浸透しなかった。そのため、ブルネル硬度は０．１６Ｎ／ｍｍ²となり強度改善は得られなかった。 [Comparative Example 1]
Four injection holes 6 (diameter 15 mm, depth 5 mm) were drilled at the surface position shown in FIG. 7 of the sound absorbing panel erected in the same manner as in Example 1 using an electric drill.
Then, an osmotic aqueous reinforcing agent 7 obtained by diluting 120 g of an active ingredient lithium silicate-based reinforcing agent to 1200 g with water was tried to be uniformly injected into each injection hole 6. However, since the depth of the injection hole 6 was not sufficient and did not pass through the water-repellent layer 5, the permeable water-based reinforcing agent 7 hardly penetrated into the sound absorbing panel. Therefore, the Brunel hardness was 0.16 N / mm ² and no improvement in strength was obtained.

［比較例２］
実施例１と同様に立設させた吸音パネルの図９に示す表面位置（パネル上端から１５０ｍｍで両側端から２２５ｍｍおよび４５０ｍｍとなる位置）に、電動ドリルを用いて注入孔６（直径１５ｍｍ、深さ３０ｍｍ）を４個穿孔した。
そして、有効成分１２０ｇのケイ酸リチウム系強化剤を水で１２００ｇに希釈し
た浸透性水性強化剤７を各注入孔６へ３００ｇ（有効成分３０ｇ）ずつ均等に注入して３日間静置した。
しかし、表１に示すように、吸音パネルの長手方向中央部は下方小口面から上方へ２００ｍｍの位置であっても、吸音パネル内部に浸透性水性強化剤７が半分程度しか浸透していなかった。そのため、ブルネル硬度は平均０．２４Ｎ／ｍｍ²であったとともに０．１６Ｎ／ｍｍ²の部位もあり、パネル内部の部位によってブリネル硬度に著しく差があり強度改善はほとんど得られなかった。 [Comparative Example 2]
In the surface position shown in FIG. 9 of the sound absorbing panel erected in the same manner as in Example 1 (positions that are 150 mm from the upper end of the panel and 225 mm and 450 mm from both ends), an injection drill 6 is used (diameter 15 mm, depth). 4 holes) were drilled.
Then, 300 g (effective ingredient 30 g) of osmotic aqueous reinforcing agent 7 obtained by diluting 120 g of active ingredient lithium silicate type reinforcing agent to 1200 g with water was evenly injected into each injection hole 6 and allowed to stand for 3 days.
However, as shown in Table 1, even though the central portion in the longitudinal direction of the sound absorbing panel is located at a position of 200 mm upward from the lower facet, only about half of the permeable water reinforcing agent 7 penetrated into the sound absorbing panel. . Therefore, Brunel hardness was 0.24 N / mm ² on average and there was also a site of 0.16 N / mm ² , and the Brinell hardness was significantly different depending on the site inside the panel, and strength improvement was hardly obtained.

［比較例３］
実施例１と同様に立設させた吸音パネルの図７に示す表面位置に、電動ドリルを用いて注入孔６（直径１５ｍｍ、深さ３０ｍｍ）を４個穿孔した。
そして、有効成分１２ｇのスチレンアクリル樹脂系強化剤を水で１２００ｇに希釈した浸透性水性強化剤７を各注入孔６へ３００ｇ（有効成分３ｇ）ずつ均等に注入した。
しかし、表１に示すように、音源側表面３６００ｃｍ²当たりの浸透性水性強化剤７の有効成分が４ｇとなり、その結果、浸透性水性強化剤７の浸透性および吸音率は十分に得られたが、ブルネル硬度が０．２２Ｎ／ｍｍ²と低く強度改善はほとんど得られなかった。 [Comparative Example 3]
Four injection holes 6 (diameter 15 mm, depth 30 mm) were drilled at the surface position shown in FIG. 7 of the sound absorbing panel erected in the same manner as in Example 1 using an electric drill.
Then, 300 g (effective ingredient 3 g) of each of the permeable aqueous reinforcing agents 7 obtained by diluting the effective ingredient 12 g of the styrene acrylic resin-based reinforcing agent to 1200 g with water was uniformly injected into each injection hole 6.
However, as shown in Table 1, the effective component of the permeable aqueous reinforcing agent 7 per 3600 cm ^{2 of} the sound source side surface was 4 g. As a result, the permeability and sound absorption rate of the permeable aqueous reinforcing agent 7 were sufficiently obtained. However, the Brunel hardness was as low as 0.22 N / mm ² and almost no improvement in strength was obtained.

［比較例４］
実施例１と同様に立設させた吸音パネルの図７に示す表面位置に、電動ドリルを用いて注入孔６（直径１５ｍｍ、深さ３０ｍｍ）を４個穿孔した。
そして、有効成分４４０ｇのスチレンアクリル樹脂系強化剤を水で１２００ｇに希釈した浸透性水性強化剤７を各注入孔６へ３００ｇ（有効成分１１０ｇ）ずつ均等に注入した。
しかし、表１に示すように、音源側表面３６００ｃｍ²当たりの浸透性水性強化剤７の有効成分が１４６ｇとなったことにより、ブルネル硬度０．７５Ｎ／ｍｍ²と強度の改善がみられたが、浸透状況にムラがあり試験体によりそのバラツキが大きく、また連続気孔表面における開口部が浸透性水系強化剤により閉鎖されて吸音性能が大きく低下していた。 [Comparative Example 4]
Four injection holes 6 (diameter 15 mm, depth 30 mm) were drilled at the surface position shown in FIG. 7 of the sound absorbing panel erected in the same manner as in Example 1 using an electric drill.
Then, permeable aqueous reinforcing agent 7 obtained by diluting 440 g of active ingredient styrene acrylic resin-based reinforcing agent to 1200 g with water was uniformly injected into each injection hole 6 by 300 g (active ingredient 110 g).
However, as shown in Table 1, the effective component of the permeable aqueous reinforcing agent 7 per 3600 cm ^{2 of} the sound source side surface was 146 g, so that the strength was improved with Brunel hardness of 0.75 N / mm ^2. In addition, there was unevenness in the permeation state, and the variation was large depending on the test specimen, and the opening on the surface of the continuous pores was closed by the permeable water-based reinforcing agent, and the sound absorption performance was greatly deteriorated.

本発明によれば、老朽化した多孔質コンクリート吸音パネルの吸音率を維持させた状態で、その強度を復元させることができる。
また、水平面に立設された吸音壁に本発明を適用すれば、少量の強化剤であっても適切にかつ効率的に浸透性多孔質コンクリート吸音パネルの強度を復元させることができる。 According to the present invention, the strength can be restored while maintaining the sound absorption rate of the aged porous concrete sound absorption panel.
Moreover, if the present invention is applied to a sound absorbing wall erected on a horizontal plane, the strength of the permeable porous concrete sound absorbing panel can be restored appropriately and efficiently even with a small amount of reinforcing agent.

本発明における吸音パネル表面に注入凹部が形成された実施例を示す吸音パネルの断面説明図。Cross-sectional view of a sound absorbing panel of an embodiment the injection recess sound absorbing panel surface is formed in the present invention. 吸音パネル表面に注入凹部が形成された実施形態を示す斜視図。The perspective view which shows embodiment by which the injection | pouring recessed part was formed in the sound absorption panel surface. 吸音パネル表面に注入凹部が形成された他の実施形態を示す斜視図。The perspective view which shows other embodiment by which the injection | pouring recessed part was formed in the sound absorption panel surface. 注入凹部から注入された強化剤がパネル内部に分散して浸透している状態を示す吸音パネルの断面説明図。Sectional view of the sound absorbing panel showing a state in which reinforcing agent injected from the injection recess is penetrated dispersed therein panel. パネル下方の注入凹部をパネル受音側へ貫通させた状態を示す断面説明図。 Cross-sectional explanatory drawing which shows the state which penetrated the injection | pouring recessed part below the panel to the panel sound-receiving side. 注入凹部のパネル音源側表面の開口部を閉塞させた状態を示す断面説明図。Cross-sectional explanatory drawing which shows the state which obstruct | occluded the opening part of the panel sound source side surface of an injection | pouring recessed part. 本発明の実施例１、２において吸音パネル表面に注入凹部が形成された状態を示すパネル正面図。Panel front view showing a state in which the injection recess is made form the acoustical panel surface in Examples 1 and 2 of the present invention. 本発明の実施例３において吸音パネル表面に注入凹部が形成された状態を示すパネル正面図。The panel front view which shows the state by which the injection | pouring recessed part was formed in the sound absorption panel surface in Example 3 of this invention. 本発明の比較例２において吸音パネル表面に注入凹部が形成された状態を示すパネル正面図。The panel front view which shows the state by which the injection | pouring recessed part was formed in the sound absorption panel surface in the comparative example 2 of this invention. 吸音パネルの任意断面における連続気孔を示すイメージ図。The image figure which shows the continuous pore in the arbitrary cross sections of a sound absorption panel. 連続気孔の具体例を示す説明図。Explanatory drawing which shows the specific example of a continuous pore. 吸音パネル下方部分に雨水が滞留している状態を示すイメージ図。The image figure which shows the state in which rain water has accumulated in the sound absorption panel lower part.

Explanation of symbols

１吸音パネル
２気孔
３３ａ、３ｂ、３ｃ、３ｄ連続気孔
４連通孔
５撥水層
６注入凹部（注入孔）
６ａパネル下方の注入凹部
７強化剤
８充填材
９水分（雨水）
１０単位面積（３６００ｍｍ²）
DESCRIPTION OF SYMBOLS 1 Sound absorption panel 2 Pore 3 3a, 3b, 3c, 3d Continuous pore 4 Communication hole 5 Water-repellent layer 6 Injection recessed part (injection hole)
6a Injection recess 7 below panel Reinforcing agent 8 Filling material 9 Moisture (rain)
10 Unit area (3600mm ² )

Claims

The total volume of continuous pores formed by connecting pores having a diameter of 0.3 to 2 mm with communication holes having a diameter of 0.1 to 1 mm occupies 30% or more of the total panel volume, and water repellent having a predetermined thickness In the internal repair method of the porous concrete sound absorption panel in which the layer is formed on the panel surface layer,
An injection recess through which the water repellent layer has passed is formed on the sound source side surface of the porous concrete sound absorbing panel so as to be spaced apart by a predetermined distance so that the active ingredient is 10 to 100 g per 3600 cm ^{2 of} the sound source side surface. A method for repairing a porous concrete sound-absorbing panel, wherein a permeable water-based reinforcing agent is dispersed and injected into the injection recess.

The method for repairing a porous concrete sound absorbing panel according to claim 1, wherein the opening of the injection recess is a circle having a diameter of 5 mm to 50 mm and the depth is 15 mm to 40 mm.

The method for repairing a porous concrete sound-absorbing panel according to claim 1, wherein the permeable aqueous reinforcing agent is an aqueous alkali silicate solution.

The method for repairing a porous concrete sound absorbing panel according to claim 3, wherein the alkali silicate aqueous solution is a lithium silicate aqueous solution.

The method for repairing a porous concrete sound absorbing panel according to any one of claims 1 to 4, wherein after the permeable water-based reinforcing agent is dispersed and injected into the injection recess, the injection recess is penetrated to the panel sound-receiving side surface.

The porous concrete sound-absorbing panel according to any one of claims 1 to 5, wherein after the permeable water-based reinforcing agent is dispersed and injected into the injection recess, the opening on the panel sound source side surface of the injection recess is closed with a filler. Repair method.

The porous concrete sound absorbing panel forms a sound absorbing wall erected on the horizontal plane. The amount of permeable water reinforcing agent (A) injected into the upper half from the center of the panel and the permeable water system injected into the lower half. The method for repairing a porous concrete sound-absorbing panel according to claim 1, wherein the injection amount (B) of the reinforcing agent is B / (A + B) ≧ 0.8.