JP5068117B2

JP5068117B2 - Laying structure and laying method for underground objects

Info

Publication number: JP5068117B2
Application number: JP2007210053A
Authority: JP
Inventors: 淳舩越; 隆弘蒲; 二朗土田; 治郎中村; 満円谷; 裕士原田
Original assignee: Kubota Corp
Current assignee: Kubota Corp
Priority date: 2007-08-10
Filing date: 2007-08-10
Publication date: 2012-11-07
Anticipated expiration: 2027-08-10
Also published as: JP2009041738A

Description

本発明は、地中に埋設された情報通信管路、配電線、ガス配管等、各種配管,構造物等の埋設物を、道路工事等の路面切断作業における切断事故から保護するための地中埋設物の敷設構造および敷設方法に関する。 The present invention provides an underground communication system for protecting buried objects such as various pipes and structures, such as information communication pipelines, distribution lines, gas pipes, etc., buried in the ground from a cutting accident in road cutting work such as road works. The present invention relates to a laying structure and a laying method for buried objects.

情報通信管路、配電線、ガス配管等の各種配管,構造物を地中に埋設する場合、他の配管・ダクト等と交差するところなどでは、路面近くに埋設せざるを得ない場合がある。
道路工事等の路版切断作業は、ダイヤモンドブレード等を搭載したコンクリートカッターを作業者が操作し、切込みを入れたり移動させたりすることにより行われる。このため上記のように浅層埋設物のある場合の路版切断作業では、誤って埋設物を切断してしまうことがある。そこで浅層埋設においては、埋設物を切断事故から防ぐ切断防護部材(以下単に「防護部材」と称することもある)として、鋼板等を路版層と埋設物との間に設置することが行われている。 When embedding various pipes and structures such as information communication pipelines, distribution lines, and gas pipes in the ground, it may be necessary to bury them near the road surface when crossing other pipes or ducts. .
Road plate cutting work such as road construction is performed by an operator operating a concrete cutter equipped with a diamond blade or the like to make a cut or move it. For this reason, in the road plate cutting operation in the case where there is a shallow buried object as described above, the buried object may be cut by mistake. Therefore, in shallow burial, a steel plate or the like must be installed between the road plate layer and the buried object as a cutting protection member (hereinafter also referred to simply as a “protective member”) that prevents the buried object from being cut. It has been broken.

しかし、鋼板等の金属板は、ダイヤモンドカッター等に対する切断抵抗性に乏しく、埋設物を切断事故から保護する効果は低い。このため埋設物の防護部材及び防護構造の改良として、次のような提案がなされている。
(a)耐火耐熱性キャスタブル材に硬い骨材(セラミックス等)を配合し分散させて防護部材(40)とする。図20に示すように、ケーブル等の埋設物(41)を埋め込んだ土層(42)の上面に凹溝(43)を形成し、これに骨材を含むキャスタブル材を充填し、養生・固化させて防護部材(40)を形成するか、または予め所定形状に成形・固化した防護部材(40)を凹溝(43)にはめ込んだうえ、コンクリート又はアスファルトで表層(44)を施す。防護部材(40)に含まれる骨材が、カッターに対する切断抵抗となり、埋設物の切断事故防止に奏効する（特許文献１）。 However, a metal plate such as a steel plate has poor cutting resistance against a diamond cutter or the like, and has a low effect of protecting an embedded object from a cutting accident. For this reason, the following proposals have been made as improvements to the protective member and protective structure for buried objects.
(a) A hard aggregate (ceramics, etc.) is blended and dispersed in a fire and heat resistant castable material to form a protective member (40). As shown in FIG. 20, a concave groove (43) is formed on the upper surface of the soil layer (42) in which the buried object (41) such as a cable is embedded, and this is filled with a castable material including aggregate, and then cured and solidified. Then, the protective member (40) is formed, or the protective member (40) previously molded and solidified into a predetermined shape is fitted into the concave groove (43), and the surface layer (44) is applied with concrete or asphalt. Aggregate contained in the protective member (40) serves as a cutting resistance against the cutter, and is effective in preventing an accidental cutting of an embedded object (Patent Document 1).

(b)高硬度鋼の表面をカッター機能劣化材で被覆して防護部材(50)とし、これを、図21に示すように下部地中(53)の埋設物(54)と路面部(55)との間に配設する。防護部材(50)の高硬度鋼(51)は耐摩耗鋼等であり、その表面を被覆するカッター機能劣化材(52)は低硬度鋼(例えば軟鋼) 等である。ダイヤモンドブレードのカッターが、防護部材(50)を切断しようとすると、低硬度鋼(52)の鉄分が刃先のダイヤモンド砥粒に付着すると共に切断の摩擦熱でダイヤモンド砥粒と鉄分との化学反応によりカッターの切断機能が劣化し、高硬度鋼(51)を切断できなくなり、埋設物の切断事故が防止される(特許文献２)。
(c)一対の鋼板を上下に重ねて防護部材(60)とする。これを、図22に示すように下土砂層(63)に埋め込まれた埋設物(64)の上に配置し、上土砂層(65)及び舗装層(66)で覆う。防護部材(60)の下側の鋼板(61)は普通鋼、上側の鋼板(62)は耐摩耗鋼板であるのが好ましい。カッターが防護部材(60)に接触すると、鋼板(61)(62)が振動し、切断負荷の急激な増加、切断速度の低下、カッターの作動停止等の異常が生じるので、切断作業を中断し地中の状態を確認することにより埋設物の切断事故を防止できる(特許文献３)。 (b) The surface of the high-hardness steel is covered with a cutter function deterioration material to form a protective member (50), which is, as shown in FIG. 21, an embedded object (54) and a road surface portion (55) in the lower ground (53). ). The high hardness steel (51) of the protective member (50) is wear resistant steel or the like, and the cutter function deterioration material (52) covering the surface thereof is low hardness steel (for example, mild steel) or the like. When the cutter of the diamond blade tries to cut the protective member (50), the iron content of the low-hardness steel (52) adheres to the diamond abrasive grains of the cutting edge and due to the chemical reaction between the diamond abrasive grains and the iron content by the frictional heat of cutting. The cutting function of the cutter is deteriorated, and the high hardness steel (51) cannot be cut, so that an accident of cutting an embedded object is prevented (Patent Document 2).
(c) A pair of steel plates are stacked one above the other to form a protective member (60). As shown in FIG. 22, this is arranged on the buried object (64) embedded in the lower soil layer (63) and covered with the upper soil layer (65) and the pavement layer (66). The lower steel plate (61) of the protective member (60) is preferably plain steel, and the upper steel plate (62) is preferably a wear-resistant steel plate. When the cutter comes into contact with the protective member (60), the steel plates (61) and (62) vibrate, causing abnormalities such as a sharp increase in the cutting load, a decrease in the cutting speed, and the stoppage of the cutter. By confirming the underground state, it is possible to prevent an accident of cutting the buried object (Patent Document 3).

(d) 硼化チタンを主成分とするセラミックスの焼結体を防護部材(70)とする。図23に示すように、コンクリート(71)で固定された埋設物(72)の直上に防護部材(70)を載置し、コンクリート(71)で固定したうえ、砂、砂利等を敷き詰めて表面(73)を舗装する。硼化チタンセラミックスは強度が大きく、カッターによる埋設物の切断事故を防止することができる(特許文献４)。
(e)セラミックス(バナジウム化合物,チタン炭化物等を含むTiB₂基セラミックス)のタイル状焼結体を防護部材(80)とし、図24に示すように、コンクリートブロック(81)内のコンクリート(82)に包囲固定された埋設物(83)の上に、該防護部材(80)を配置し鋼板(84)を被せててアスファルト(85)等で被覆する。防護部材(80)は高硬度材であり、ダイヤモンドブレードカッターが切断しようとしても、ブレード刃面の消耗が大きく、切断することができないため、埋設物(83)の切断事故が防止される(特許文献５)。 (d) A ceramic sintered body mainly composed of titanium boride is used as the protective member (70). As shown in Fig. 23, the protective member (70) is placed directly on the buried object (72) fixed with concrete (71), fixed with concrete (71), and then spread with sand, gravel, etc. Pave (73). Titanium boride ceramics have high strength and can prevent an accidental cutting of an embedded object by a cutter (Patent Document 4).
(e) Tile-shaped sintered body of ceramics (TiB _2- based ceramics containing vanadium compound, titanium carbide, etc.) is used as a protective member (80), and concrete (82) in a concrete block (81) as shown in FIG. The protective member (80) is placed on the buried object (83) fixed and surrounded by a steel plate (84) and covered with asphalt (85) or the like. The protective member (80) is a high-hardness material, and even if the diamond blade cutter tries to cut, the blade blade surface is consumed so much that it cannot be cut. Reference 5).

(f)一定の研削抵抗値(Fn/Fns≧0.9)を有するセラミックス焼結体を防護部材(90)とし、これを図25に示すように、埋設物(91)が埋め込まれたコンクリート(92)の上部に、位置ずれしないようにコンクリート(92)に一体的に固定し、鉄板(93)を被せたうえ、アスファルト層等の路面部(94)を形成する。防護部材(90)は切断抵抗性が著しく高く、ダイヤモンドブレードの刃面の急速に劣化させることにより、埋設物の切断事故が防止される(特許文献６)。
特開２００２−３２５３４５公報特開平１０−００９４８０公報特開２００１−２０８２４２公報特開平０６−２０９５１６公報特開平０６−１７２０４２公報特開２００５−２８２７５３公報 (f) A ceramic sintered body having a constant grinding resistance value (Fn / Fns ≧ 0.9) is used as a protective member (90), and as shown in FIG. 25, concrete (92) with embedded objects (91) embedded therein (92) ) Is integrally fixed to the concrete (92) so as not to be displaced and covered with an iron plate (93), and a road surface portion (94) such as an asphalt layer is formed. The protective member (90) has extremely high cutting resistance, and the blade blade surface of the diamond blade is rapidly deteriorated, thereby preventing an accidental cutting of the buried object (Patent Document 6).
JP 2002-325345 A JP 10-009480 A JP 2001-208242 A Japanese Patent Laid-Open No. 06-209516 Japanese Patent Application Laid-Open No. 06-172042 JP 2005-282755 A

前記特許文献１のキャスタブル材による防護構造は施工の自由度が大きい点で有利であるが、キャスタブル材に混在する骨材の分散形態によっては、カッターが骨材と交差せずにキャスタブル層だけを貫通して防護部材(40)を切断することもあり、その場合は骨材分散効果としての切断抵抗が得られず、信頼性に乏しい。 Although the protective structure by the castable material of the said patent document 1 is advantageous at the point with a large freedom degree of construction, depending on the dispersion form of the aggregate mixed in a castable material, a cutter does not cross | intersect an aggregate but only a castable layer. In some cases, the protective member (40) may be cut through, and in that case, the cutting resistance as an aggregate dispersion effect cannot be obtained, and the reliability is poor.

特許文献２の防護構造は、カッター機能劣化材(52)をブレード刃面に付着させダイヤモンド砥粒の化学的な変質劣化により切断機能を低下させるようにしているが、実際の路版切断作業は十分な水冷を施しながら湿式切断するのが通例であり、摩擦熱の発生も低く抑えられることから、ブレードの切断機能の劣化もそれだけ緩やかになり、高馬力・高性能なコンクリートカッター等に対する保護策として十分満足し得るものとはいい難い。
特許文献３の防護構造についても、十分な水冷が施される通常の湿式切断作業においては防護部材(60)（鋼板61,62）の切断抵抗はごく低いため、鋼板(61,62)がカッターの接触で振動しても、それによって切断速度の急速な低下やカッター動作の停止を生じさせることは困難であり、また砕石等に接触して生じる振動との区別も不明瞭であり、防護部材として十分信頼し得るものとはいい難い。 The protective structure of Patent Document 2 is such that the cutter function deterioration material (52) is attached to the blade blade surface and the cutting function is lowered due to the chemical deterioration of the diamond abrasive grains. It is customary to perform wet cutting with sufficient water cooling, and since the generation of frictional heat can be kept low, the blade cutting function is also gradually degraded, and a protective measure against high horsepower and high performance concrete cutters, etc. It is hard to say that you can be satisfied enough.
Regarding the protective structure of Patent Document 3, the steel member (61, 62) is a cutter because the cutting resistance of the protective member (60) (steel plates 61, 62) is very low in a normal wet cutting operation in which sufficient water cooling is performed. It is difficult to cause a rapid decrease in the cutting speed and stop of the cutter operation even if it vibrates due to the contact with the contact, and it is also unclear how to distinguish the vibration from contact with crushed stones. It's hard to say that you can trust enough.

特許文献４〜６に記載された防護構造は、セラミックスに特有の難切断性を利用するものである。セラミックスは、金属材料に比し著しく高硬質であり、ダイヤモンドブレードが接触すると、ダイヤモンド砥粒の脱落と激しい発熱によりその切断機能を急速に劣化させる。路版切断作業を模擬したダイヤモンドブレードによる切断試験においても卓抜した切断抵抗性が観察され、従って埋設物の防護部材として優れた効果を奏するはずである。しかし、実際の路版切断作業では、必ずしもそうではなく、セラミックス材料が有する本来の切断抵抗性に基づく防護機能を十分に発揮させることができない。 The protective structures described in Patent Documents 4 to 6 utilize difficult cutting properties unique to ceramics. Ceramics are extremely hard compared to metallic materials, and when the diamond blade comes into contact, the cutting function is rapidly deteriorated due to falling off of diamond abrasive grains and intense heat generation. In cutting tests with a diamond blade simulating road plate cutting work, outstanding cutting resistance is observed, and therefore, it should have an excellent effect as a protective member for buried objects. However, in actual road cutting work, this is not necessarily the case, and the protective function based on the original cutting resistance of the ceramic material cannot be sufficiently exhibited.

近年、切断機の大馬力化、ダイヤモンドブレードの技術進歩等により、切断能力が大きく向上し、高速度・重切断が可能となり、これに伴い地中埋設物の切断事故に対する防護部材の切断防止機能の一層の向上強化が要請されている。
本発明者らは上記に鑑み、高硬質材であるセラミックスの難切断性を利用して防護部材の切断防止機能を強化すべく鋭意検討を重ねた。本発明者らの詳細な考察によれば、セラミックス板を用いた従来の防護部材が、予期したほどの切断防止効果を奏し得ないのは、以下のようにセラミックスが脆性材料であることに起因している。 In recent years, cutting capacity has been greatly improved due to the increased horsepower of cutting machines and the technological advancement of diamond blades, etc., enabling high speed and heavy cutting. There is a demand for further improvement and strengthening.
In view of the above, the inventors of the present invention have made extensive studies to reinforce the function of preventing the protective member from being cut using the hard-to-cut properties of ceramics, which are highly hard materials. According to the detailed consideration of the present inventors, the conventional protective member using a ceramic plate cannot achieve the expected cutting prevention effect because the ceramic is a brittle material as follows. is doing.

防護部材として埋設されたセラミックス板に、ダイヤモンドブレード等の切断刃が近接し、切断刃の強い振動（コンクリートや砕石等の難切断材の切断で増幅される）や切断機の操作上の衝撃等によって急激にクラックが生じ破断した状態になると、セラミックス板の切断抵抗性が著しく損なわれ、切断刃の移動（見掛け上の切断）が生じ易くなる。そのような切断態様（以下これを「破壊切断」と称する）では、切断刃の切断機能の急速な劣化（刃面のダイヤモンド砥粒の脱落及び激しい発熱等による）は殆ど期待することができない。この破壊切断の現象は、高速・重切断条件において生じ易く、またブレーカやバックホー等を用いた道路工事に伴う強い機械衝撃が重畳されることにより更に顕著となる。セラミックス板の卓抜した切断抵抗性を十分に発揮させ、切断防止機能を高めるには、破壊切断を排し、クラック等に影響されない状態での切断（以下これを「静的切断」と称する）が確保されなければならない。 Cutting blades such as diamond blades are close to the ceramic plate embedded as a protective member, strong vibrations of the cutting blades (amplified by cutting difficult-to-cut materials such as concrete and crushed stone), impacts on the operation of the cutting machine, etc. When a crack is suddenly generated due to the above, the cutting resistance of the ceramic plate is significantly impaired, and the movement of the cutting blade (apparent cutting) is likely to occur. In such a cutting mode (hereinafter referred to as “destructive cutting”), it is almost impossible to expect a rapid deterioration of the cutting function of the cutting blade (due to dropping of diamond abrasive grains on the blade surface and intense heat generation). This phenomenon of breaking and cutting is likely to occur under high speed and heavy cutting conditions, and becomes more prominent due to the superposition of strong mechanical impacts accompanying road construction using breakers, backhoes, and the like. In order to fully exhibit the outstanding cutting resistance of the ceramic plate and enhance the anti-cutting function, it is necessary to eliminate destructive cutting and to perform cutting in a state not affected by cracks (hereinafter referred to as “static cutting”). Must be secured.

本発明者らは更に検討を重ねた結果、セラミックス板を金属板と組み合わせコンクリート等の自硬性充填材層に密着させた一体的な固定構造を形成することにより、セラミックス板の静的な切断が確保されセラミックス板の卓抜した切断抵抗性を十分に発揮させると共に、両者の相乗効果として切断刃の切断機能の急速な劣化を助長せしめ、ダイヤモンドブレード等による高速・重切断条件の路面切断作業において、埋設物に対する切断防護部材としての信頼性を高めることができるとの知見を得た。本発明はこの知見に基づいてなされたものである。 As a result of further investigations, the inventors of the present invention have made it possible to statically cut the ceramic plate by forming an integrated fixing structure in which the ceramic plate is combined with a metal plate and adhered to a self-hardening filler layer such as concrete. In addition to fully exhibiting the outstanding cutting resistance of the secured ceramic plate, the synergistic effect of both promotes the rapid deterioration of the cutting function of the cutting blade. The knowledge that it was possible to improve the reliability as a cutting protection member for buried objects was obtained. The present invention has been made based on this finding.

本発明に係る地中埋設物の敷設構造（請求項１）は、
自硬性充填材層に包囲されて溝内に固定された埋設物の上側に、路版切断作業時の切断事故から該埋設物を保護するための切断防護部材を配設したうえ、路版層で被覆してなる地中埋設物の敷設構造において、
前記切断防護部材は、自硬性充填材層に配置されたセラミックス板と、該セラミックス板を覆うように該セラミックス板に接触載置された金属板とからなり、前記切断防護部材は、前記金属板の板厚方向の少なくとも一部及び前記セラミックス板が自硬性充填材層の表層内に該セラミックス板の板厚を超える深さに埋入されて、前記金属板の前記セラミックス板に接触している領域を除く下面が自硬性充填材層に密着している状態で固定され、前記セラミックス板の上面とその上面に接触している前記金属板の下面とのそれぞれは、表面粗さが、Ｒａ:１.５μｍ以下およびＲｙ:10μｍ以下、反り(C)が２ｍｍ以下である
ことを特徴としている。 The laying structure for underground objects according to the present invention (Claim 1)
On the upper side of the buried object surrounded by the self-hardening filler layer and fixed in the groove, a cutting protection member for protecting the buried object from a cutting accident at the time of the road plate cutting work is disposed, and the road plate layer In the laying structure of underground objects covered with
The cutting protection member includes a ceramic plate disposed in a self-hardening filler layer and a metal plate placed in contact with the ceramic plate so as to cover the ceramic plate, and the cutting protection member includes the metal plate. At least part of the plate thickness direction and the ceramic plate are embedded in the surface layer of the self-hardening filler layer at a depth exceeding the plate thickness of the ceramic plate and are in contact with the ceramic plate of the metal plate The lower surface excluding the region is fixed in close contact with the self-hardening filler layer, and each of the upper surface of the ceramic plate and the lower surface of the metal plate in contact with the upper surface has a surface roughness of Ra: It is characterized by 1.5 μm or less, Ry: 10 μm or less, and warpage (C) of 2 mm or less .

本発明に係る地中埋設物の第１の敷設方法（請求項５）は、
埋設物を配置した溝内に自硬性充填材を打設して埋設物を包囲する自硬性充填材層を形成し、該埋設物を路版切断作業時の切断事故から保護するための切断防護部材を配設したうえ、路版層で被覆する地中埋設物の敷設方法において、
前記切断防護部材は、自硬性充填材層に配置されたセラミックス板と、該セラミックス板を覆うように該セラミックス板に接触載置された金属板とからなり、前記セラミックス板の上面とその上面に接触している前記金属板の下面とのそれぞれは、表面粗さが、Ｒａ:１.５μｍ以下およびＲｙ:10μｍ以下、反り(C)が２ｍｍ以下であり、埋設物を包囲している自硬性充填材層の上面に、前記切断防護部材を固定するための自硬性充填材を打設して新たな自硬性充填材層を形成したうえ、該自硬性充填材層の表層が未凝固流動状態を保持している間に、前記セラミックス板を該自硬性充填材層の上に配置すると共に該セラミックス板を覆うように前記金属板を該セラミックス板に接触載置したうえ、前記金属板の板厚方向の少なくとも一部及び前記セラミックス板を自硬性充填材層の表層内に該セラミックス板の板厚を超える深さに埋入して、前記金属板の前記セラミックス板に接触している領域を除く下面が自硬性充填材層に密着している状態で該自硬性充填材層を硬化させる
ことを特徴としている。 The first laying method for underground objects according to the present invention (Claim 5 ) is as follows.
Cutting protection to protect the buried object from cutting accidents during road slab cutting by forming a self-hardening filler layer in the groove where the buried object is placed to form a self-hardening filler layer surrounding the buried object. In the method of laying underground objects to be covered with road plate layers after arranging the members,
The cutting protection member includes a ceramic plate disposed on a self-hardening filler layer and a metal plate placed in contact with the ceramic plate so as to cover the ceramic plate, and the upper surface of the ceramic plate and the upper surface thereof Each of the lower surfaces of the metal plates that are in contact with each other has a surface roughness of Ra: 1.5 μm or less and Ry: 10 μm or less, and a warp (C) of 2 mm or less. A new self-hardening filler layer is formed by placing a self-hardening filler for fixing the cutting protection member on the upper surface of the filler layer, and the surface layer of the self-hardening filler layer is in an unsolidified flow state. While holding the ceramic plate, the ceramic plate is placed on the self-hardening filler layer and the metal plate is placed on the ceramic plate so as to cover the ceramic plate. thickness direction of at least a portion and said La mix plate is embedded to a depth greater than the thickness of the ceramic plate in the surface layer of self-hardening filler material layer, the lower surface excluding the area in contact with the ceramic plate of the metal plate is self-hardening filler The self-hardening filler layer is cured while being in close contact with the layer.

本発明に係る地中埋設物の第２の敷設方法（請求項６）は、
既設の地中埋設物を被覆する路版層を除去して、該埋設物を包囲している自硬性充填材層の上面を露出させ、路版切断作業時の切断事故から該埋設物を保護するための切断防護部材を配設したうえ、路版層で被覆する地中埋設物の敷設方法において、
前記切断防護部材は、自硬性充填材層に配置されたセラミックス板と、該セラミックス板を覆うように該セラミックス板に接触載置された金属板とからなり、前記セラミックス板の上面とその上面に接触している前記金属板の下面とのそれぞれは、表面粗さが、Ｒａ:１.５μｍ以下およびＲｙ:10μｍ以下、反り(C)が２ｍｍ以下であり、埋設物を包囲している自硬性充填材層の上面に、前記切断防護部材を固定するための自硬性充填材を打設して新たな自硬性充填材層を形成したうえ、該自硬性充填材層の表層が未凝固流動状態を保持している間に、前記セラミックス板を該自硬性充填材層の上に配置すると共に該セラミックス板を覆うように前記金属板を該セラミックス板に接触載置したうえ、前記金属板の板厚方向の少なくとも一部及び前記セラミックス板を自硬性充填材層の表層内に該セラミックス板の板厚を超える深さに埋入して、前記金属板の前記セラミックス板に接触している領域を除く下面が自硬性充填材層に密着している状態で該自硬性充填材層を硬化させる
ことを特徴としている。 The second laying method for underground objects according to the present invention (Claim 6 ) is as follows.
The road plate layer covering the existing underground object is removed, the upper surface of the self-hardening filler layer surrounding the embedded object is exposed, and the buried object is protected from cutting accidents during road plate cutting work. In the laying method of underground objects to be covered with a road plate layer, after providing a cutting protection member for
The cutting protection member includes a ceramic plate disposed on a self-hardening filler layer and a metal plate placed in contact with the ceramic plate so as to cover the ceramic plate, and the upper surface of the ceramic plate and the upper surface thereof Each of the lower surfaces of the metal plates that are in contact with each other has a surface roughness of Ra: 1.5 μm or less and Ry: 10 μm or less, and a warp (C) of 2 mm or less. A new self-hardening filler layer is formed by placing a self-hardening filler for fixing the cutting protection member on the upper surface of the filler layer, and the surface layer of the self-hardening filler layer is in an unsolidified flow state. While holding the ceramic plate, the ceramic plate is placed on the self-hardening filler layer and the metal plate is placed on the ceramic plate so as to cover the ceramic plate. thickness direction of at least a portion and said La mix plate is embedded to a depth greater than the thickness of the ceramic plate in the surface layer of self-hardening filler material layer, the lower surface excluding the area in contact with the ceramic plate of the metal plate is self-hardening filler The self-hardening filler layer is cured while being in close contact with the layer.

ダイヤモンドブレード等の切断刃に対するセラミックス板の卓抜した切断抵抗性(ダイヤモンド砥粒の脱落・激しい発熱によるブレード刃面の急激な変質劣化現象)を十分に発現させるには、前述したようにセラミックス板の破壊切断(破断状態における見掛けの切断)を排し、切断刃等による振動や衝撃が作用してもセラミックスにクラックが生じることなく、静的な切断が確保されることを要する。
本発明は、その手段として、セラミックス板とこれを覆う金属板とからなる切断防護部材を、自硬性充填材層の表層内に、セラミックス板の板厚を超える深さに埋入させて自硬性充填材層に固定させている。この防護部材(セラミックス板＋金属板)の固定構造の効果として、路版切断作業時のダイヤモンドブレード等の切断刃の振動や衝撃等を金属板に効果的に吸収させ、セラミックス板の静的切断を確保することができる。これにより、セラミックス板の卓抜した切断抵抗性を十分に発揮させ、ダイヤモンドブレード等の切断速度を急激に低下（例えば3.5mm/秒以下に減速）させることを可能にしている。
この切断防護部材による切断速度・切断負荷の急激な変化やカッターの作動停止等の異常状態の発生によって、直ちに切断作業者に地中構造の変化(地中埋設物の存在等)を察知させると共に、切断刃が埋設物に達する前に切断機を停止させることが容易になり、埋設物切断事故の防止効果が高められる。 In order to fully develop the outstanding cutting resistance of the ceramic plate against the cutting blade such as a diamond blade (sudden deterioration of the blade blade surface due to dropping of diamond abrasive grains or intense heat generation), as described above, Destructive cutting (apparent cutting in a broken state) is eliminated, and it is necessary to ensure static cutting without causing cracks in ceramics even when vibrations or impacts are applied by a cutting blade or the like.
In the present invention, as a means, a cutting protection member comprising a ceramic plate and a metal plate covering the ceramic plate is embedded in the surface layer of the self-hardening filler layer to a depth exceeding the plate thickness of the ceramic plate. It is fixed to the filler layer. As an effect of this protective member (ceramic plate + metal plate) fixing structure, the vibration and impact of the cutting blades such as diamond blades during road plate cutting work are effectively absorbed by the metal plate, and the ceramic plate is statically cut. Can be secured. As a result, the cutting resistance of the ceramic plate is fully exhibited, and the cutting speed of the diamond blade or the like can be rapidly reduced (for example, reduced to 3.5 mm / second or less).
As a result of sudden changes in the cutting speed and cutting load by this cutting protection member and the occurrence of abnormal conditions such as cutter stoppage, the cutting operator immediately notices changes in the underground structure (such as the presence of underground objects). It becomes easy to stop the cutting machine before the cutting blade reaches the buried object, and the effect of preventing the buried object cutting accident is enhanced.

セラミックス板は、それ自身ではブレードの振動衝撃等によるクラックが生じ易いため本来の切断抵抗性を十分に発揮させることができず、他方金属板は比較的軟質でダイヤモンドブレード等に対する切断抵抗性に乏しい材料である。このため各々単独では防護部材として有効に機能させることができないが、本発明によれば、自硬性充填材層に対するセラミックス板と金属板の一体的な固定構造の効果として高度の切断防護機能が発現される。前記特許文献５及び６に記載された防護構造は、セラミックス板と金属板とを使用する点で本発明と共通しているが、セラミックス板と金属板の一体的な固定構造の示唆はなく、本発明の前記作用効果はこれら特許文献の発明では奏し得ない独自のものである。
なお、セラミックスは、金属 (例えば耐摩耗性鋼等)に比べ、著しく高硬質であるので、セラミックス板を金属板と組み合わせた本発明の防護部材は、前記特許文献２及び３のように複数種の金属板を重ね合わせた防護部材と異なって、水冷が施される通常の湿式切断においても、ダイヤモンドブレード等に対する高い切断抵抗性を失わず、卓抜した切断防止機能が安定に保持される。 Ceramic plates themselves are prone to cracking due to blade vibration shocks, etc., so that the original cutting resistance cannot be fully exerted. On the other hand, metal plates are relatively soft and have poor cutting resistance against diamond blades and the like. Material. For this reason, each can not function effectively as a protective member alone, but according to the present invention, a high degree of cutting protection function is manifested as an effect of the integrated fixing structure of the ceramic plate and the metal plate to the self-hardening filler layer. Is done. The protective structures described in Patent Documents 5 and 6 are common to the present invention in that a ceramic plate and a metal plate are used, but there is no suggestion of an integrated fixing structure of the ceramic plate and the metal plate, The operational effects of the present invention are unique that cannot be achieved by the inventions of these patent documents.
Since ceramics are extremely harder than metals (for example, wear-resistant steel), the protective member of the present invention in which a ceramic plate is combined with a metal plate has a plurality of types as in Patent Documents 2 and 3. Unlike the protective member in which the metal plates are stacked, even in a normal wet cutting in which water cooling is performed, a high cutting resistance against a diamond blade or the like is not lost, and the outstanding cutting preventing function is stably maintained.

更に、金属板として鉄系金属板（鉄板,鋼板,鋳鉄板等）を適用する場合は、セラミックス板の静的切断に必要な前記緩衝効果と併せて、ブレード刃面のダイヤモンド砥粒の化学的変化により切断機能の低下を促進する効果が重畳される。これは鉄系金属板がダイヤモンドブレードで切断される際に、ダイヤモンド砥粒の炭素(Ｃ)が金属板の鉄(Ｆｅ)中に拡散し、砥粒の変質劣化（C＋Fe→Fe₃C）が生起することによる。この化学反応はブレード刃面が高温に熱せられることにより急速に進行する。破壊切断の場合と異なって、静的な切断においては、セラミックス板の切断に伴う激しい摩擦熱の発生でブレード刃面が高温に熱せられ、かつ刃面に溶着した金属分でダイヤモンド砥粒が被覆されること等の効果として、上記化学反応によるダイヤモンド砥粒の変質劣化およびそれに伴う砥粒の破砕、脱落等が顕著化し、結果としてブレードの切断機能の劣化(切断速度の急速な低下)がいっそう促進される。 Furthermore, when iron-based metal plates (iron plate, steel plate, cast iron plate, etc.) are used as the metal plate, the diamond abrasive grains on the blade blade surface are chemically treated together with the buffering effect required for static cutting of ceramic plates. The effect of promoting the reduction of the cutting function is superimposed by the change. This is because when the iron-based metal plate is cut with a diamond blade, the carbon (C) of the diamond abrasive grains diffuses into the iron (Fe) of the metal plate, and the deterioration of the abrasive grains (C + Fe → Fe ₃ C) occurs. By happening. This chemical reaction proceeds rapidly when the blade blade surface is heated to a high temperature. Unlike the case of destructive cutting, in static cutting, the blade blade surface is heated to a high temperature due to the generation of intense frictional heat accompanying the cutting of the ceramic plate, and the diamond abrasive grains are covered with the metal deposited on the blade surface. As an effect, the deterioration of the diamond abrasive grains due to the above chemical reaction and the accompanying breakage, dropout, etc. of the abrasive grains become prominent, resulting in further deterioration of the blade cutting function (rapid decrease in cutting speed). Promoted.

切断防護部材を構成するセラミックス板と金属板のそれぞれの板厚は比較的薄くてよく、このため切断防護部材の嵩張りを抑えることができ、浅層埋設[防護部材を被覆する路版層(9)の形成に必要な高さ方向の制約が大きい]に対する適用も容易である。
また、埋設物の切断事故防止に対する信頼性が高められることにより、防護部材の配置面域(溝の幅方向サイズ)をそれだけ小さくすることができる。 The thickness of each of the ceramic plate and the metal plate constituting the cutting protection member may be relatively thin, so that the bulk of the cutting protection member can be suppressed, and the embedding of the shallow layer [road plate layer covering the protection member ( 9) is very easy to apply.
In addition, since the reliability for preventing a cut accident of the embedded object is enhanced, the arrangement surface area (the width direction size of the groove) of the protective member can be reduced accordingly.

図１及び図２は本発明の地中埋設物の敷設構造(請求項１)の例を示している（図１：溝幅方向断面、図２:図１のY-Y矢視断面）。
埋設物(４)は、地面を掘削して形成された溝(１)内の所定位置に、自硬性充填材層(５)に包囲されて固定され、自硬性充填材層(５)の表層に切断防護部材(６)が配置されたうえ、路版層(９)で被覆されている。防護部材(６)は、セラミックス板(７)とこれを覆うように重ねられた金属板(８)とからなる。
この例における切断防護部材(６)は、セラミックス板(７)を溝(１)内の自硬性充填材層(５)の左右両側に並列配置し、これに金属板(８)を溝幅方向に架け渡した形態を有している。金属板(８)は、一方のセラミックス板(７₁)の外側縁から他方のセラミックス板(７₂)の外側縁に到る幅方向長さを有し、その両端域は、左右のセラミックス板(７₁,７₂)の上面に接触載置されている。 1 and 2 show an example of the underground construction structure of the present invention (Claim 1) (FIG. 1: cross section in the groove width direction, FIG. 2: cross section taken along arrow YY in FIG. 1).
The buried object (4) is surrounded and fixed by a self-hardening filler layer (5) at a predetermined position in a groove (1) formed by excavating the ground, and the surface layer of the self-hardening filler layer (5). A cutting protection member (6) is disposed on the cover and is covered with a road plate layer (9). The protective member (6) includes a ceramic plate (7) and a metal plate (8) stacked to cover the ceramic plate.
In this example, the cutting protection member (6) has the ceramic plate (7) arranged in parallel on both the left and right sides of the self-hardening filler layer (5) in the groove (1), and the metal plate (8) is placed in the groove width direction. It has a form that spans over. The metal plate (8) has a length in the width direction from the outer edge of _one ceramic plate (7 ₁ ) to the outer edge of the other ceramic plate (7 ₂ ). It is placed in contact with the upper surface of (7 ₁ , 7 ₂ ).

切断防護部材(６)は、自硬性充填材層(５)の表層内に、セラミックス板(７)(71,72)の板厚を超える深さに埋入されている。より好ましくは、金属板(８)の板厚の少なくとも一部を含めて自硬性充填材層(５)の表層内に埋入する。これにより切断防護部材(６)の固定構造がより安定化される。
また、金属板(８)の両端域［左右のセラミックス板(71,72)に接触載置されている］を除く面域(中間面域)の下面は、自硬性充填材層(５)に密着している。この切断防護部材(６)の埋入形態の効果として、防護部材(６)を構成するセラミックス板(７)と金属板(８)の自硬性充填材層(５)に対する一体的な密着固定状態が確保される。 The cutting protection member (6) is embedded in the surface layer of the self-hardening filler layer (5) to a depth exceeding the plate thickness of the ceramic plates (7) (71, 72). More preferably, the metal plate (8) is embedded in the surface layer of the self-hardening filler layer (5) including at least a part of the plate thickness. Thereby, the fixing structure of the cutting protection member (6) is further stabilized.
In addition, the lower surface of the surface area (intermediate surface area) excluding both end areas of the metal plate (8) [in contact with the left and right ceramic plates (71, 72)] is formed on the self-hardening filler layer (5). It is in close contact. As an effect of the embedding form of the cutting protection member (6), the ceramic plate (7) and the metal plate (8) constituting the protection member (6) are integrally adhered and fixed to the self-hardening filler layer (5). Is secured.

上記図示の例において、切防護部材(６)のセラミックス板(７)を、溝の左右両側にのみ配置して金属板(８)を架け渡した構成としているのは、路版切断作業では、溝(１)を横切る向き(直交ないし斜交方向)に切断刃を進入させる作業形態が通常であることから、溝の両側において、切断速度の急激な変化と地中構造の異常を作業者に気付かせれば、防護部材としての役目を果たすことができるからである。すなわちセラミックス板(７)は必ずしも溝(１)の幅方向全体に亘って配置しなくてよい。 In the illustrated example, the ceramic plate (7) of the cut protection member (6) is arranged only on the left and right sides of the groove and the metal plate (8) is bridged. Since the work form is usually in which the cutting blade is moved in a direction (orthogonal or oblique) across the groove (1), abrupt changes in the cutting speed and abnormal underground structure are detected on both sides of the groove. This is because if it is noticed, it can serve as a protective member. That is, the ceramic plate (7) does not necessarily have to be arranged over the entire width direction of the groove (1).

図３及び図４は本発明に係る敷設構造の他の例を示している（図３：溝幅方向断面、図４:図３のY-Y矢視断面）。
切断防護部材(６)は、溝内(１)内の自硬性充填材層(５)の左右両側に並列配置されたセラミックス板(７₁,７₂)とこれに架け渡された金属板(８)とからなると共に、自硬性充填材層(５)の表層内に、セラミックス板の板厚を超える深さに埋入され、金属板(８)の中間面域(セラミックス板７₁,７₂に載置された両端を除く面域)は自硬性充填材層(８)に密着している。この構成は前記（図１,図２）の敷設構造と同じであるが、左右のセラミックス板(７₁,７₂)の上面と金属板(８)の両端域の下面との間に自硬性充填材層(８)を介在させている点において、前記のそれと相違している。
従ってこの例における切断防護部材(６)は、セラミックス板(７)と金属板(８)とが互いの重ね合わせ面に介在する自硬性充填材を介して密着した状態で自硬性充填材層(５)の表層内に一体的に固定されている。 3 and 4 show another example of the laying structure according to the present invention (FIG. 3: cross section in the groove width direction, FIG. 4: cross section taken along arrow YY in FIG. 3).
The cutting protection member (6) includes ceramic plates (7 ₁ , 7 ₂ ) arranged in parallel on the left and right sides of the self-hardening filler layer (5) in the groove (1) and a metal plate ( 8) and embedded in the surface layer of the self-hardening filler layer (5) to a depth exceeding the thickness of the ceramic plate, and the intermediate surface area of the metal plate (8) (ceramic plates 7 ₁ , 7 _{The surface area} excluding both ends placed on ₂ ) is in close contact with the self-hardening filler layer (8). This configuration is the same as the laying structure described above (FIGS. 1 and 2), but is self-hardening between the upper surfaces of the left and right ceramic plates (7 ₁ , 7 ₂ ) and the lower surfaces of both end regions of the metal plate (8). This is different from that described above in that a filler layer (8) is interposed.
Therefore, the cutting protection member (6) in this example has a self-hardening filler layer (7) in a state where the ceramic plate (7) and the metal plate (8) are in close contact with each other via the self-hardening filler interposed between the overlapping surfaces. It is integrally fixed in the surface layer of 5).

上記図１〜図４の敷設構造において、防護部材(６)のセラミックス板(７)と金属板(８)とは、互いの外側端面が略一致した状態に組み合わされている。これと異なる形態、例えば図１１のようにその端縁部がセラミックス板(７)より外側に突出している場合、それによる不都合をきたすことはないが、そのような長尺サイズの金属板を使用する実益はなく、他方、図１２に示すように、セラミックス板(７)の外側端部が金属板(８)より外側に露出するような場合は、セラミックス板(７)に切断刃の振動・衝撃等による破損が生じ易く防護部材としての機能が低下することになるので避けるべきである。 In the laying structure shown in FIGS. 1 to 4, the ceramic plate (7) and the metal plate (8) of the protective member (6) are combined in a state in which the outer end faces of each other are substantially coincident. In a different form, for example, as shown in FIG. 11, when the end edge protrudes outside the ceramic plate (7), there is no inconvenience, but such a long metal plate is used. On the other hand, as shown in FIG. 12, when the outer end portion of the ceramic plate (7) is exposed to the outside of the metal plate (8), the ceramic plate (7) is subjected to vibration / cutting of the cutting blade. Since damage due to impact or the like is likely to occur, the function as a protective member is deteriorated and should be avoided.

切断防護部材(６)を構成するセラミックス板(７)と金属板(８)は、図２及び図４に示すように、溝方向(紙面に垂直方向)に沿って隣り合うセラミックス板(７)(７)同士、金属板(８)(８)同士のそれぞれを相互に密着させた状態で配列すると共に、図１３のように、セラミックス板同士の継目(7f)の位置と、金属板同士の継ぎ目(8f)の位置とが一致しないように配列する。 As shown in FIGS. 2 and 4, the ceramic plate (7) and the metal plate (8) constituting the cutting protection member (6) are adjacent to each other along the groove direction (perpendicular to the paper surface) (7). (7) The metal plates (8) and (8) are arranged in close contact with each other, and as shown in FIG. 13, the position of the joint (7f) between the ceramic plates and the metal plates Arrange so that the position of the seam (8f) does not match.

切断防護部材(６)のセラミックス板(７)(７₁,７₂)は、自硬性充填材層(５)の表層内に埋入されているので、セラミックス板(７₁,７₂)のそれぞれの内側の端面に、自硬性充填材層(５) の段差(セラミックス板7の板厚に相当する段差)が形成されている。この段差は、防護部材(６)の側面にコンクリートカッターが押付けられた際に、セラミックス板(７₁,７₂)の位置ずれに対する抵抗となり、切断防護機能の安定保持に奏効する。この埋入形態は、後述のように、溝内に打設された自硬性充填材層の表層が未硬化流動状態を保持している間に、セラミックス板(７₁,７₂)を配置し、その自重及び必要に応じてその上面から下向きに加えられる荷重の作用で、セラミックス板(７₁, ７₂)を所要の深さまで表層内に沈降させることにより形成される。 Since the ceramic plates (7) (7 ₁ , 7 ₂ ) of the cutting protection member (6) are embedded in the surface layer of the self-hardening filler layer (5), the ceramic plates (7 ₁ , 7 ₂ ) A step (a step corresponding to the thickness of the ceramic plate 7) of the self-hardening filler layer (5) is formed on each inner end face. When the concrete cutter is pressed against the side surface of the protective member (6), this step becomes a resistance against displacement of the ceramic plates (7 ₁ , 7 ₂ ), and is effective in stably maintaining the cutting protection function. As will be described later, this embedding mode is such that the ceramic plates (7 ₁ , 7 ₂ ) are arranged while the surface layer of the self-hardening filler layer placed in the groove is kept in an uncured fluid state. The ceramic plate (7 ₁ , 7 ₂ ) is submerged in the surface layer to a required depth by the action of its own weight and, if necessary, a load applied downward from its upper surface.

図５は、切断防護部材(６)の全体を自硬性充填材層(５)の表層内に埋入させた例を示している。このように金属板(８)の上面が自硬性充填材層(５)で被覆されるように切断防護部材(６)を埋入させた場合は、セラミックス板(７)と金属板(８)の自硬性充填材層(５)に対する一体的な固定構造がより一層強化される。図は、セラミックス板(７₁,７₂)と金属板(８)との重ね合せ面を接触させた形態(重ね合せ面間に自硬性充填材が介在しない)を示しているが、重ね合せ面間に自硬性充填材を介在させた形態(図３,図４)においても同様である。 FIG. 5 shows an example in which the entire cutting protection member (6) is embedded in the surface layer of the self-hardening filler layer (5). When the cutting protection member (6) is embedded in such a manner that the upper surface of the metal plate (8) is covered with the self-hardening filler layer (5), the ceramic plate (7) and the metal plate (8) are embedded. The integral fixing structure to the self-hardening filler layer (5) is further strengthened. The figure shows a form in which the overlapping surfaces of the ceramic plates (7 ₁ , 7 ₂ ) and the metal plate (8) are in contact (no self-hardening filler is interposed between the overlapping surfaces). The same applies to the configuration (FIGS. 3 and 4) in which a self-hardening filler is interposed between the surfaces.

切断防護部材(６)を構成する一方の部材であるセラミックス板(７)は、酸化物(例えばアルミナ,ジルコニア)系、窒化物(例えば窒化珪素)系、硼化物(例えば硼化チタン)系等の板状焼結体が適宜使用される。好適な例として前記特許文献６(特開平2005-282753号公報)に開示された、研削抵抗比Ｆn/Ｆnsが0.9以上の高い切断抵抗性を有する焼結体が挙げられる。 The ceramic plate (7) which is one member constituting the cutting protection member (6) is an oxide (eg, alumina, zirconia) type, nitride (eg, silicon nitride) type, boride (eg, titanium boride) type, etc. The plate-like sintered body is appropriately used. A preferred example is a sintered body having a high cutting resistance having a grinding resistance ratio Fn / Fns of 0.9 or more, which is disclosed in Patent Document 6 (Japanese Patent Laid-Open No. 2005-282753).

切断防護部材(６)のもう一方の部材である金属板(８)は、鉄系又は非鉄系の金属板が適宜使用され、鉄系金属板の例として鉄板,鋼板,鋳鉄板,鋳鋼板等、非鉄系金属板の例としてニッケル板等がそれぞれ挙げられる。特に、鉄系金属板をセラミックス板と組み合わせた防護部材(６)は、ダイヤモンドブレードカッターの切断作用に対し、鉄系金属板とダイヤモンド砥粒との反応(Fe-C炭化物の生成反応)によるダイヤモンド砥粒の変質劣化を生じさせ、砥粒の摩滅、破砕、脱落等を助長しブレードの切断機能の劣化(切断速度の急速な低下)を促進させることができる。 The metal plate (8), which is the other member of the cutting protection member (6), is suitably an iron-based or non-ferrous metal plate. Examples of iron-based metal plates include iron plates, steel plates, cast iron plates, cast steel plates, etc. Examples of non-ferrous metal plates include nickel plates. In particular, the protective member (6) in which an iron-based metal plate is combined with a ceramic plate is diamond produced by the reaction between the iron-based metal plate and diamond abrasive grains (the formation reaction of Fe-C carbide) against the cutting action of the diamond blade cutter. It is possible to cause deterioration of the abrasive grains, promote abrasion, crushing, and dropping off of the abrasive grains, and promote deterioration of the cutting function of the blade (rapid decrease in cutting speed).

自硬性充填材は、代表的にはコンクリート又はコンクリートモルタルであり、そのほか地中埋設物の埋設構造の材料として必要な強度、化学的安定性等を有すると共に、コンクリートやコンクリートモルタルと同じようにセラミックス板及び金属板との密着性を備えたものが適宜使用される。 The self-hardening filler is typically concrete or concrete mortar, and also has the necessary strength and chemical stability as materials for the buried structure of underground objects, as well as ceramics like concrete and concrete mortar. What provided the adhesiveness with a board and a metal plate is used suitably.

次に、本発明の埋設物の敷設施工について説明する。
図６，図７は、本発明の切断防護部材を配置して地中埋設構造を形成する敷設方法（請求項５）の実施例を示している。まず、図６のように地面を掘削して形成した溝(１)内に埋設物(４) を配置すると共に型枠(２)を設け、型枠(２)内に自硬性充填材(例えば生コンクリート)(５_R)を打設する。型枠(２)内に打設した自硬性充填材（５_R）の表層部が未硬化の流動状態( 例えばスランプ値：約10) を保持している間に、セラミックス板(７₁,７₂)を、溝幅方向に離隔させて表層の左右両側に並列配置する。そのセラミックス板(７₁,７₂)に金属板(５)を架け渡しセラミックス板(７₁,７₂)を覆うように接触載置して切断防護部材(６)を構成し、セラミックス板(７₁,７₂)の板厚を超える深さに埋入させる。その埋入は、切断防護部材(６)の自重により、必要に応じ金属板(８)の上から適宜荷重を加えることにより行われる。 Next, the construction of the buried object according to the present invention will be described.
6, FIG. 7 shows an embodiment of a laying how (claim 5) by placing the cutting protection member of the present invention to form the underground construction. First, as shown in FIG. 6, an embedded object (4) is placed in a groove (1) formed by excavating the ground, and a mold (2) is provided, and a self-hardening filler (for example, Place ready-mixed concrete (5 _R ). While the surface layer portion of the self-hardening filler (5 _R ) placed in the mold (2) holds an uncured fluid state (for example, slump value: about 10), the ceramic plate (7 ₁ , 7 ₂ ) are arranged in parallel on the left and right sides of the surface layer, separated in the groove width direction. Constitute the ceramic plate (7 _1, 7 ₂₎ in the metal plate (5) a bridged passing ceramic plate (7 _1, 7 ₂₎ contact placed so as to cover the to cut protective member (6), a ceramic plate ( It is embedded to a depth exceeding the plate thickness of 7 ₁ , 7 ₂ ). The embedding is performed by appropriately applying a load from above the metal plate (8) as necessary by the weight of the cutting protection member (6).

図７は、このように切断防護部材(６)を自硬性充填材層(５_R)の表層に埋め込んだ状態を示している。金属板(８)の左右両端域の下面はセラミックス板(７₁,７₂)の上面に接触し、中間域(左右のセラミックス板と重なり合った部分を除く面域)の下面は自硬性充填材層(５_R)に密着している。この埋め込み状態のもとに自硬性充填材層(５_R)を硬化させ、型枠(２)の外側の残余の溝空間(11)に土砂を埋め戻したうえ、溝の表面を路版層(９)で被覆することにより前記図１(及び図２)の敷設構造を完成する。 FIG. 7 shows a state in which the cutting protection member (6) is embedded in the surface layer of the self-hardening filler layer (5 _R ). The lower surface of the left and right end regions of the metal plate (8) is in contact with the upper surface of the ceramic plate (7 ₁ , 7 ₂ ), and the lower surface of the intermediate region (excluding the portion overlapping the left and right ceramic plates) is a self-hardening filler. Adhering closely to the layer (5 _R ). Under this embedding condition, the self-hardening filler layer (5 _R ) is cured, and the remaining groove space (11) outside the formwork (2) is backfilled with earth and sand. By covering with (9), the laying structure of FIG. 1 (and FIG. 2) is completed.

前記図７の敷設構造では、金属板(８)の左右両端域の下面をセラミックス板(７₁,７₂)の上面に接触させているが、これと異なって図８のように、セラミックス板(７₁,７₂)を、その上面が未硬化流動状態の自硬性充填材で被覆されるように未硬化流動状態の表層内に埋入させて金属板(８)を重ね合わせ、その状態で自硬性充填材層(５_R)を硬化させれば、前記図３(及び図４)に示したように、セラミックス板(７₁,７₂)の上面と金属板(８)の左右両端域の下面とが自硬性充填材を介在して密着した敷設構造が形成される。 In the laying structure of FIG. 7, the lower surfaces of the left and right end regions of the metal plate (8) are in contact with the upper surfaces of the ceramic plates (7 ₁ , 7 ₂ ), but unlike this, as shown in FIG. (7 ₁ , 7 ₂ ) is embedded in an uncured fluidized surface layer so that its upper surface is covered with an uncured fluidized self-hardening filler, and the metal plate (8) is superposed, If the self-hardening filler layer (5 _R ) is cured by the above, as shown in FIG. 3 (and FIG. 4), the upper surface of the ceramic plate (7 ₁ , 7 ₂ ) and the left and right ends of the metal plate (8) A laying structure in which the lower surface of the region is in close contact with the self-hardening filler is formed.

図９及び図１０は、既設の埋設構造物に、本発明の切断防護部材(６)を適用する施工方法(請求項６)の実施例を示している。
まず、図９のように路版層(９)を掘り起して地中の自硬性充填材層(５)の上面を露出させる。露出した自硬性充填材層(５)の上面を、必要に応じ削って平坦化し、その上面部に型枠(２)を配置して自硬性充填材(生コンクリート等)を打設し、適当な層厚(例えば２０〜４０ｍｍ)の自硬性充填材層(５_R)を形成する。打設した自硬性充填材層(５_R)の表層部が未硬化流動状態(例えばスランプ値：約10)を保持している間に、セラミックス板(７₁,７₂)を溝幅方向の左右両側に配置する。 9 and 10, the existing buried structures, shows an embodiment of a construction method of applying a cutting protection member of the present invention (6) (claim 6).
First, as shown in FIG. 9, the road plate layer (9) is dug up to expose the upper surface of the self-hardening filler layer (5) in the ground. The exposed upper surface of the self-hardening filler layer (5) is cut and flattened as necessary, and a mold (2) is placed on the upper surface portion and a self-hardening filler (such as ready-mixed concrete) is placed, A self-hardening filler layer (5 _R ) having a sufficient layer thickness (for example, 20 to 40 mm) is formed. While the surface layer portion of the cast self-hardening filler layer (5 _R ) holds an uncured fluid state (for example, slump value: about 10), the ceramic plates (7 ₁ , 7 ₂ ) are moved in the groove width direction. Place on the left and right sides.

上記セラミックス板(７₁,７₂)に金属板(８)を接触載置して溝幅方向に架け渡すことにより切断防護部材(６)を構成する。この切断防護部材(６)を、セラミックス板(７₁,７₂)の板厚を超える深さに埋入させる(図１０)。この埋入形態は、図６及び図７を参照して説明した前記施工要領と同じように、切断防護部材(６)の自重及び必要に応じ金属板8の上から加えられる荷重の作用により形成される。その埋入状態のもとに、自硬性充填材層(５_R)を硬化させると共に、型枠(２)の外側の残余の溝空間(11)を土砂で埋め戻したうえ、溝の表面を路版層(９)で被覆して前記図１の敷設構造を形成する。 A cutting protection member (6) is constructed by placing the metal plate (8) in contact with the ceramic plates (7 ₁ , 7 ₂ ) and spanning them in the groove width direction. This cutting protection member (6) is embedded to a depth exceeding the thickness of the ceramic plates (7 ₁ , 7 ₂ ) (FIG. 10). This embedding form is formed by the action of the weight of the cutting protection member (6) and the load applied from above the metal plate 8 as necessary, as in the construction procedure described with reference to FIGS. Is done. Under the embedded condition, the self-hardening filler layer (5 _R ) is hardened and the remaining groove space (11) outside the formwork (2) is backfilled with earth and sand, and then the surface of the groove is removed. The laying structure of FIG. 1 is formed by covering with a road plate layer (9).

上記図１０の敷設構造では、金属板(８)の左右両端域の下面をセラミックス板(７₁,７₂)の上面に接触させているが、これと異なってセラミックス板(７₁,７₂)を、その上面が未硬化流動状態の自硬性充填材で被覆されるように未硬化流動状態の表層内に埋入させて金属板(８)を重ね合わせ、その状態で自硬性充填材層(５_R)を硬化させれば、前記図３(及び図４)に示したように、セラミックス板(７₁,７₂)の上面と金属板(８)の左右両端域の下面とが自硬性充填材を介在して密着した敷設構造を形成することができる。 In the laying structure of FIG. 10, the lower surfaces of the left and right end regions of the metal plate (8) are brought into contact with the upper surface of the ceramic plate (7 ₁ , 7 ₂ ), but unlike the ceramic plate (7 ₁ , 7 _2). ) Is embedded in the surface layer of the uncured fluidized state so that the upper surface is coated with the uncured fluidized state of the self-hardening filler, and the metal plate (8) is overlaid, and in that state the self-hardening filler layer If (5 _R ) is cured, as shown in FIG. 3 (and FIG. 4), the upper surface of the ceramic plates (7 ₁ , 7 ₂ ) and the lower surfaces of the left and right end regions of the metal plate (8) A laying structure can be formed in close contact with a hard filler.

なお、前記図5のように、防護部材(６)を自硬性充填材層(５)に埋没させた設置形態(金属板8の上面を含む全体を自硬性充填材層5の表層内に埋入させている)を形成するには、上記図６〜図１０の施工において、防護部材(６)の上から加えられる荷重を調整し又は金属板(８)の上面に未硬化流動状態の自硬性充填材を適宜追加投与して防護部材(６)を、その全厚を超える深さに埋入させたうえ、自硬性充填材層(５_R)を硬化させるようにすればよい。 As shown in FIG. 5, the protective member (6) is embedded in the self-hardening filler layer (5) (the entire surface including the upper surface of the metal plate 8 is embedded in the surface layer of the self-hardening filler layer 5). 6 to 10 above, the load applied from above the protective member (6) is adjusted or the metal plate (8) is self-adapted in an uncured fluid state. A protective filler (6) may be embedded to a depth exceeding the total thickness by appropriately adding a hard filler, and the self-hardening filler layer (5 _R ) may be cured.

次に、切断防護部材(６)のセラミックス板(７)と金属板(８)の形状・サイズ等の具体例について図１４,図１５等を参照して説明する。以下の説明において、
Ｌ₀：埋設物4の外側端部とセラミックス板7の外側縁との間の水平離隔距離、
Ｌ₄：埋設物4の大きさ(溝幅方向)、
Ｌ₇：セラミックス板7の板幅(溝幅方向長さ) 、
Ｌ₈：金属板8の板幅(溝幅方向長さ)、
Ｌ_8M：金属板5の中間域(セラミックス板7の上面に重なる両端域を除く面域)の溝幅方向長さ、である。
複数の埋設物(4,4,4…)が溝幅方向に並列配置されている場合(図14)における埋設物の外側端縁とは、最外側の埋設物の外側端縁であり、埋設物の大きさ(L₄)とは一端側の埋設物の外側端縁から他端側の埋設物の外側端縁に到る水平差渡し長さである。 Next, specific examples of the shape and size of the ceramic plate (7) and the metal plate (8) of the cutting protection member (6) will be described with reference to FIGS. In the following description:
L ₀ : horizontal separation distance between the outer edge of the buried object 4 and the outer edge of the ceramic plate 7,
L ₄ : Size of buried object 4 (groove width direction),
L ₇ : plate width of the ceramic plate 7 (length in the groove width direction),
L ₈ : Plate width of the metal plate 8 (length in the groove width direction),
L _8M : the length in the groove width direction of the intermediate region of the metal plate 5 (the surface region excluding both end regions overlapping the upper surface of the ceramic plate 7).
When multiple buried objects (4, 4, 4 ...) are arranged in parallel in the groove width direction (Fig. 14), the outer edge of the buried object is the outer edge of the outermost buried object. The size (L ₄ ) of the object is a horizontal passing length from the outer edge of the embedded object on one end side to the outer edge of the embedded object on the other end side.

埋設物に対する切断防護効果の点から、セラミックス板(７)の埋設物(４)からの離隔距離(Ｌ₀)および板幅(Ｌ₇)を大きくするのが有利なことは明らかであるが、それに伴い溝(１)の掘削幅の拡大等が必要となり施工コストが増大する。本発明では、切断防護部材(６)の優れた切断抵抗性の効果として、離間距離(Ｌ₀)を約45〜60ｍｍ、セラミックス板の板幅(Ｌ₇)も約50〜100ｍｍの比較的小さなサイズとすることができる。 From the viewpoint of the effect of cutting protection against the buried object, it is clear that it is advantageous to increase the distance (L ₀ ) and the plate width (L ₇ ) of the ceramic plate (7) from the buried object (4). Accordingly, it is necessary to increase the excavation width of the groove (1), and the construction cost increases. In the present invention, as an effect of excellent cutting resistance of the cutting protection member (6), the separation distance (L ₀ ) is about 45 to 60 mm, and the plate width (L ₇ ) of the ceramic plate is also about 50 to 100 mm. Can be size.

本発明は、セラミックス板(７)と金属板(８)とを一体的に自硬性充填材層(５)の表層に固定させた効果として切断防護部材(６)の切断抵抗性を高めている。前記図１(及び図２)のようにセラミックス板(７₁,７₂)の上面に金属板(８)の両端域の下面を接触させた構成の場合は、両者の重ね合せ面の密着性を増し一体的な固定効果を高めるために、セラミックス板の上面(S7_A)と金属板の両端域の下面(S_8E)は、それぞれの表面粗さ(JIS B0601)Ｒａ:1.5μｍ以下、Ｒｙ:10μｍ以下、JIS A5209「陶磁器質タイル」の「反りの測定」の規定による値(以下「反り(C)」)２ｍｍ以下、の平坦性を有するのが好ましい。
また金属板(８)の中間面域(S_8M)が自硬性充填材層(５)の表層面に接触していることは自硬性充填材層(５)に対する切断防護部材(６)の一体的な固定構造を安定化するのに有利であり、該中間面域の板幅(L_8M)と両端域(セラミックス板に接触した面域)の板幅(L_8E)との比(Ｌ_8M/Ｌ₇)は約1〜20であるのが好ましい。 The present invention improves the cutting resistance of the cutting protection member (6) as an effect of fixing the ceramic plate (7) and the metal plate (8) integrally to the surface layer of the self-hardening filler layer (5). . As shown in FIG. 1 (and FIG. 2), in the case where the lower surface of both end regions of the metal plate (8) is in contact with the upper surface of the ceramic plate (7 ₁ , 7 ₂ ), the adhesion of the overlapping surfaces of the two In order to increase the integral fixing effect, the upper surface (S7 _A ) of the ceramic plate and the lower surface (S _8E ) of both end regions of the metal plate have respective surface roughnesses (JIS B0601) Ra: 1.5 μm or less, Ry : It is preferable to have a flatness of 10 μm or less and JIS A5209 “Ceramic Ceramic Tile” defined by the “measurement of warpage” (hereinafter “warp (C)”) of 2 mm or less.
Further, the fact that the intermediate surface area (S _8M ) of the metal plate (8) is in contact with the surface layer surface of the self-hardening filler layer (5) means that the cutting protection member (6) is integrated with the self-hardening filler layer (5). It is advantageous to stabilize a typical fixing structure, and the ratio (L _8M ) between the plate width (L _8M ) of the intermediate surface area and the plate width (L _8E ) of both end areas (surface area in contact with the ceramic plate) / L ₇ ) is preferably about 1-20.

他方、図３(及び図４)における切断防護部材(６)は、セラミックス板(７₁,７₂)の上面(S_7A)と金属板(８)の両側下面(S_8E)との重ね合せ面間に自硬性充填材を介在させた構成であるので、前記したセラミックス板(7)と金属板(８)の平坦性は必要としないが、自硬性充填材の介在層厚ｔ_I(図16)を過度に厚くすると、セラミックス板(７)と金属板(８)との組み合せ効果が弱められるので、該層厚は約0.5〜2.5ｍｍであるのが望ましい。 On the other hand, the cutting protection member (6) in FIG. 3 (and FIG. 4) is an overlay of the upper surface (S _7A ) of the ceramic plates (7 ₁ , 7 ₂ ) and the lower surfaces (S _8E ) of both sides of the metal plate (8). Since the self-hardening filler is interposed between the surfaces, the flatness of the ceramic plate (7) and the metal plate (8) is not required, but the intervening layer thickness t _I of the self-hardening filler (see FIG. If 16) is excessively thick, the combined effect of the ceramic plate (7) and the metal plate (8) is weakened, so the layer thickness is preferably about 0.5 to 2.5 mm.

図１(及び図２)、図３(及び図４)の各敷設構造において、セラミックス板(７)及び金属板(８)の自硬性充填材層(６)との接触面積を大きくすることは、ラミックス板(７)と金属板(８)との一体性を高めるのに有利である。接触面積の増加は、表面粗さを大きくすることにより得られる。この観点から、図１(及び図２)の防護部材(６)では、セラミックス板の下面(S_7B)と端面(S_7C)、および金属板(８)の中間域の下面(S_8M)（図15参照）の表面粗さを大きくし、他方図３(及び図４)の防護部材(６)では、セラミックス板の上下両面(S_7A)(S_7B),端面(S_7C)、及び金属板(８)の下面全域(S₈)（図15参照）の表面粗さを大きくするのがよい。その表面粗さは、例えばＲy：４μｍ以上、Ｒａ：0.5μｍ以上である。 In each laying structure of FIG. 1 (and FIG. 2) and FIG. 3 (and FIG. 4), it is possible to increase the contact area between the ceramic plate (7) and the metal plate (8) with the self-hardening filler layer (6). It is advantageous for enhancing the integrity of the lamix plate (7) and the metal plate (8). The increase in the contact area can be obtained by increasing the surface roughness. From this point of view, in the protective member (6) of FIG. 1 (and FIG. 2), the lower surface (S _7B ) and end surface (S _7C ) of the ceramic plate, and the lower surface (S _8M ) of the intermediate region of the metal plate (8) ( 15)), while the protective member 6 in FIG. 3 (and FIG. 4), the upper and lower surfaces (S _7A ) (S _7B ), end surface (S _7C ), and metal of the ceramic plate It is preferable to increase the surface roughness of the entire lower surface (S ₈ ) (see FIG. 15) of the plate (8). The surface roughness is, for example, Ry: 4 μm or more and Ra: 0.5 μm or more.

セラミックス板(７)及び金属板(８)の板厚について、セラミックス板(７)は、切断抵抗部材料として約５ｍｍ以上の板厚を有するのが好ましい。板厚の増加により切断抵抗性は高くなるが、約10ｍｍ程度までの板厚で十分である。一方金属板(８)は、路版作業のブレーカ及びバックホー等による機械的な衝撃やダイヤモンドブレード等による振動・衝撃を吸収緩和し、セラミックス板(７)の保護効果を十分なものとするために約５ｍｍ以上の板厚が好ましい。板厚の増加により効果は増すが、約30ｍｍを超える厚さとする実益はなく、５〜20ｍｍ程度で十分である。なお、セラミックス板(７)及び金属板(８)の平面サイズを例示すれば、セラミックス板(７)は、幅40〜75ｍｍ、長さ80〜110ｍｍ、金属板(８)は、幅300〜500ｍｍ、長さ500〜1000ｍｍである。 Regarding the plate thickness of the ceramic plate (7) and the metal plate (8), the ceramic plate (7) preferably has a plate thickness of about 5 mm or more as a cutting resistance material. Although the cutting resistance increases as the plate thickness increases, a plate thickness of up to about 10 mm is sufficient. On the other hand, the metal plate (8) absorbs and relaxes mechanical shocks caused by road breaker breakers and backhoes, and vibrations / impacts caused by diamond blades, etc., so that the protective effect of the ceramic plate (7) is sufficient. A plate thickness of about 5 mm or more is preferred. Although the effect is increased by increasing the plate thickness, there is no actual benefit of having a thickness exceeding about 30 mm, and about 5 to 20 mm is sufficient. In addition, if the plane size of the ceramic plate (7) and the metal plate (8) is illustrated, the ceramic plate (7) has a width of 40 to 75 mm, a length of 80 to 110 mm, and the metal plate (8) has a width of 300 to 500 mm. The length is 500 to 1000 mm.

本発明の切断防護部材(６)は卓抜した切断抵抗性を有するので、埋設物(４)に対して近接配置することができ、全厚さ(セラミックス板7と金属板8の合計板厚)も薄く設計することができるので、浅層埋設構造への適用が容易である。例えば、埋設深さ(埋設物の頂端部から路版層の上面までの鉛直方向離間幅Ｈ₁,図14参照)が約200ｍｍの浅層埋設において、セラミックス板(７)の板厚を10ｍｍ、金属板(８)の板厚を20ｍｍとした場合、切断防護部材(６)の全厚は30ｍｍで済み、切断防護部材(６)と埋設物頂端部との鉛直方向の離隔幅(Ｈ₂)(図14)を約30ｍｍ程度とすれば、路版層 (アスファルト,コンクリート等の層)(９)の形成に必要なスペース(高さ方向サイズ)も十分に確保することができる。 Since the cutting protection member (6) of the present invention has outstanding cutting resistance, it can be placed close to the embedded object (4), and the total thickness (total thickness of the ceramic plate 7 and the metal plate 8). Since it can be designed to be thin, it can be easily applied to a shallow buried structure. For example, in the embedding depth (the vertical separation width H ₁ from the top end of the buried object to the upper surface of the road plate layer, see FIG. 14), the thickness of the ceramic plate (7) is 10 mm, When the thickness of the metal plate (8) is 20 mm, the total thickness of the cutting protection member (6) may be 30 mm, and the vertical separation width (H ₂ ) between the cutting protection member (6) and the top end of the embedded object If (Fig. 14) is about 30 mm, the space (height direction size) necessary to form the road slab layer (layer of asphalt, concrete, etc.) (9) can be sufficiently secured.

[1]防護部材
(1.1)セラミックス板
(ａ)二硼化チタン系セラミックス板
化学組成：TiB₂-3%Ni-1%WC-9%Cr₃C₂
焼結条件：1860℃×1Hr(雰囲気:Ar、0.1MPa)
サイズ：100×100×^t７（mm）
(ｂ)炭化けい素系セラミックス板
化学組成：SiC-0.5%B₄C-0.5%C
焼結条件：2000℃×１Hr(雰囲気:Ａｒ,0.1MPa)
サイズ：100×100×^t７（mm）
(ｃ)窒化けい素系セラミックス板
化学組成：Si₃N₄-5%MgAl₂O₃-5%ZrO₂-(2.5Mol%Y₂O₃含有)
焼結条件：1750℃×1Hr(雰囲気:N₂,1MPa)
サイズ：100×100×^t７（mm） [1] Protective members
(1.1) Ceramic plate
(a) Titanium diboride ceramic plate Chemical composition: TiB ₂ -3% Ni-1% WC-9% Cr ₃ C ₂
Sintering conditions: 1860 ° C x 1Hr (atmosphere: Ar, 0.1 MPa)
Size: 100 x 100 x ^t 7 (mm)
(b) Silicon carbide ceramic plate Chemical composition: SiC-0.5% B ₄ C-0.5% C
Sintering conditions: 2000 ° C x 1 hr (atmosphere: Ar, 0.1 MPa)
Size: 100 x 100 x ^t 7 (mm)
(c) Silicon nitride ceramic plate Chemical composition: Si ₃ N ₄ -5% MgAl ₂ O ₃ -5% ZrO _2- (containing 2.5Mol% Y ₂ O ₃ )
Sintering conditions: 1750 ° C x 1 hr (atmosphere: N ₂ , 1 MPa)
Size: 100 x 100 x ^t 7 (mm)

(1.2)金属板
鋼板(JIS G3101 SS400普通鋼鋼板,サイズ700×500×^t16,mm) (1.2) Metal plate Steel plate (JIS G3101 SS400 plain steel plate, size 700 × 500 × ^t 16, mm)

[2]防護部材の敷設形態及び切断試験条件
(2.1)埋設物の敷設
図17に示すように、埋設物(４)(管径50cmの鋼管)を溝(１)内に配置し、自硬性充填材(生コンクリート)(５_R)を打設したうえ、未硬化流動状態の表層の左右両側にセラミックス板(７₁,７₂)を配置すると共に金属板(８)を重ねて切断防護部材(６)を形成し、自硬性充填材層の硬化後、路版層(アスファルト層,厚さ50cm)(９)で被覆する。
H₂(図14参照)…40mm
L₀(図14参照)…50mm [2] Installation style of protective member and cutting test conditions
(2.1) Laying the buried object As shown in Fig. 17, the buried object (4) (steel pipe with a pipe diameter of 50 cm) is placed in the groove (1), and self-hardening filler (green concrete) (5 _R ) is struck. In addition, ceramic plates (7 ₁ , 7 ₂ ) are arranged on both the left and right sides of the uncured fluidized surface layer, and the metal plate (8) is stacked to form the cutting protection member (6), and the self-hardening filler layer After curing, a road plate layer (asphalt layer, thickness 50 cm) (9) is coated.
H ₂ (See Fig. 14)… 40mm
L ₀ (See Fig. 14)… 50mm

(2.2)切断試験条件
[切断機]ロビンNDC2型EY160（1600cc,35HP）[富士重工(株)製]
ブレード：SDC400N75B/200D×15T
ブレード回転速度：1600/rpm（通常切断時の回転数）
[切断操作]ブレードが防護部材に対し一定の深さから入るように、手前から直角に切断を開始した後、ブレードを水平方向(横方向)に走査させる。切断操作はブレード回転数が一定となるように調整しながら行い、切断完了またはブレード劣化によるエンジン停止もしくは乗り上げまでとする。 (2.2) Cutting test conditions
[Cutting machine] Robin NDC2 type EY160 (1600cc, 35HP) [Fuji Heavy Industries, Ltd.]
Blade: SDC400N75B / 200D × 15T
Blade rotation speed: 1600 / rpm (rotation speed during normal cutting)
[Cutting operation] After cutting at a right angle from the front so that the blade enters the protective member from a certain depth, the blade is scanned in the horizontal direction (lateral direction). The cutting operation is performed while adjusting the blade rotation speed to be constant until the cutting is completed or the engine stops or rides on due to blade deterioration.

［3］切削抵抗性及び防護性能の評価
表１に防護部材の構成、表２に試験結果をそれぞれ示す。
表１中、「部材総厚Ｔ₆」は切断防護部材のセラミックス板(７)と金属板(８)の合計板厚（セラミックス板7と金属板8との間に自硬性充填材が層状に介在している場合は、その介在層厚ｔ_Iを加えた値=ｔ₇＋ｔ₈＋ｔ_I）であり、「埋入深さD₆」はセラミックス板(７)の下面からコンクリート層(５)の最上面までの鉛直方向距離である(図18,図19)。
「切断速度」は、セラミックス板の溝幅方向長さ/切断所要時間の比[但し切断途中でブレードの乗り上げ・エンジン停止となった場合は、その位置までの切断長さと切断時間の比]である。 [3] Evaluation of cutting resistance and protection performance Table 1 shows the configuration of protection members, and Table 2 shows the test results.
In Table 1, “total member thickness T ₆ ” is the total thickness of the ceramic plate (7) and the metal plate (8) of the cutting protection member (the self-hardening filler is layered between the ceramic plate 7 and the metal plate 8). When intervening, the value obtained by adding the intervening layer thickness t _I = t ₇ + t ₈ + t _I ), and the “embedding depth D ₆ ” is the concrete layer (5) from the lower surface of the ceramic plate (7). Is the vertical distance to the top surface of (Fig. 18, Fig. 19).
“Cutting speed” is the ratio of the length of the ceramic plate in the groove width direction / the time required for cutting [however, if the blade is run or the engine is stopped during cutting, the ratio of the cutting length to the position and the cutting time] is there.

表２中、「ダイヤモンド砥粒の毀損率(%)」は、切断試験後のダイヤモンドブレード刃面を約20倍に拡大して観察し、一定面積における砥粒の状態を、下記のａ〜ｃに分類したうえ、砥粒の全個数(a+b+c)に対するｂ及びｃの合計砥粒個数(b+c)の割合[=(b+c)/(a+b+c) ×100]として算定した値である。
ａ…完全状態(損傷なし)、ｂ…破砕・摩滅状態、ｃ…脱落状態 In Table 2, “Diamond abrasive grain damage rate (%)” is observed by enlarging the diamond blade edge surface after the cutting test by about 20 times, and the state of the abrasive grains in a certain area is expressed by the following ac The ratio of the total number of abrasive grains (b + c) of b and c to the total number of abrasive grains (a + b + c) [= (b + c) / (a + b + c) × 100 ] Is the value calculated as
a ... complete state (no damage), b ... crushed and worn state, c ... dropped state

上記実施例(表1,表2)に示したように、発明例のものは、切断防護部材を構成するセラミックス板と金属板の一体的な固定構造の効果として、ブレード刃面を急速に劣化させ、切断速度を短時間で激減させることを可能にしている。この卓抜した切断抵抗性により、埋設物の切断事故に対する防護機能の信頼性が高められる。 As shown in the above examples (Tables 1 and 2), the invention example rapidly deteriorates the blade blade surface as an effect of the integrated fixing structure of the ceramic plate and the metal plate constituting the cutting protection member. The cutting speed can be drastically reduced in a short time. This outstanding cutting resistance enhances the reliability of the protective function against cutting accidents of buried objects.

他方、比較例No.11〜18は、セラミックス板と金属板の組み合わせ効果として、No.17,18(セラミックス板単体構造)及びNo.19(金属板単体構造)に比べ改良された切断抵抗性を有しているが、No.11〜14(防護部材埋入深さD₆不足)は、切断刃の接触に伴う金属板の位置ずれのために静的切断状態を安定保持することができず、結果として刃面の損傷及び切断速度の変化は軽微であり、切断抵抗性の改良効果は少ない。特にNo.11、No.13では金属板の位置ずれのため、セラミックス板との組合せ効果としての切断抵抗性を評価することができなかった。なおNo.15(介在層厚ｔ_I過大)は、セラミックス板と金属板との組合わせ効果が活かされず、切断抵抗性の改善効果は少ない。またNo.16(セラミックス板の板厚不足)及びNo.17,18(ラミックス板の表面粗さ・反り低劣)においても、静的切断状態の安定性が悪く、切断抵抗性の改善効果は低いレベルに留まっている。 On the other hand, Comparative Examples No. 11 to 18 have improved cutting resistance compared to No. 17 and 18 (ceramic plate single-piece structure) and No. 19 (metal plate single-piece structure) as a combination effect of the ceramic plate and metal plate. has the, Nanba11～14 (protective member buried Nyufuka of D ₆ deficiency) is a static disconnected state for the displacement of the metal plate due to the contact of the cutting blade can be stably held As a result, the damage to the blade surface and the change in the cutting speed are slight, and the effect of improving the cutting resistance is small. In particular, in No. 11 and No. 13, the cutting resistance as a combination effect with the ceramic plate could not be evaluated due to the displacement of the metal plate. Note No.15 (intermediate layer thickness t _I excessive) is combined effect of the ceramic plate and the metal plate is not utilized, the effect of improving the cut resistance is small. In No.16 (insufficient thickness of ceramic plate) and No.17,18 (surface roughness and warpage of ramix plate), the stability of static cutting state is poor and the effect of improving cutting resistance is Remains at a low level.

本発明によれば、切断防護部材の卓抜した切断抵抗性により、埋設構造物に進入する切断刃の切断機能を急激に劣化させることができ、切断負荷・切断速度の急激な変化、カッターの作動停止等によって、地中構造の変化(地中埋設物の存在等)を直ちに作業者に察知させ、地中埋設物を切断事故から保護することができる。
本発明の切断防護部材は、薄厚・狭幅サイズに設計して埋設物に近接配置することができる。これにより、溝幅を小さくすることができ、溝の掘削作業の軽減、自硬性充填材量(溝内の打設量)の節減等、埋設施工コストの大幅な低減効果が得られる。また、切断防護部材が薄厚サイズに設計されることにより、浅層埋設構造物への適用が容易になる。 According to the present invention, due to the outstanding cutting resistance of the cutting protection member, the cutting function of the cutting blade entering the embedded structure can be rapidly deteriorated, the change in cutting load and cutting speed is abrupt, the operation of the cutter By stopping, etc., changes in the underground structure (existence of underground objects, etc.) can be immediately detected by workers, and the underground objects can be protected from cutting accidents.
The cutting protection member according to the present invention can be designed in a thin and narrow size and can be placed close to an embedded object. As a result, the groove width can be reduced, and the effect of significantly reducing the burial cost can be obtained, such as reducing the excavation work of the groove and reducing the amount of self-hardening filler (the amount of placement in the groove). In addition, since the cutting protection member is designed to have a thin size, application to a shallow buried structure is facilitated.

本発明の地中埋設物防護構造の例を示す断面説明図である。It is sectional explanatory drawing which shows the example of the underground buried object protection structure of this invention. 図１のY-Y矢視断面図である。It is a YY arrow sectional view of FIG. 本発明の地中埋設物防護構造の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the underground buried object protection structure of this invention. 図３のY-Y矢視断面図である。FIG. 4 is a cross-sectional view taken along line YY in FIG. 3. 本発明の埋設物防護構造の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the buried object protection structure of this invention. 本発明の地中埋設物の敷設施工の説明図である。It is explanatory drawing of the laying construction of the underground thing of this invention. 本発明の地中埋設物の敷設施工の説明図である。It is explanatory drawing of the laying construction of the underground thing of this invention. 本発明の地中埋設物の敷設施工の説明図である。It is explanatory drawing of the laying construction of the underground thing of this invention. 本発明の地中埋設物の敷設施工の説明図である。It is explanatory drawing of the laying construction of the underground thing of this invention. 本発明の地中埋設物の敷設施工の説明図である。It is explanatory drawing of the laying construction of the underground thing of this invention. 防護部材のセラミックス板と金属板の外側端部を示す説明図である。It is explanatory drawing which shows the outer side edge part of the ceramic plate and metal plate of a protection member. 防護部材のセラミックス板と金属板の外側端部を示す説明図である。It is explanatory drawing which shows the outer side edge part of the ceramic plate and metal plate of a protection member. 防護部材のセラミックス板と金属板の重ね合わせ形態を示す図である。It is a figure which shows the lamination | stacking form of the ceramic plate and metal plate of a protection member. 防護部材の配置態様説明図である。It is explanatory drawing of the arrangement | positioning aspect of a protection member. 防護部材を構成するセラミックス板及び金属板の表面域説明図である。It is surface area explanatory drawing of the ceramic plate and metal plate which comprise a protection member. 防護部材の埋設形態の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the embedding form of a protection member. 実施例における切断抵抗性評価試験の説明図である。It is explanatory drawing of the cutting resistance evaluation test in an Example. 実施例における防護部材の埋設形態の説明図であるIt is explanatory drawing of the embedding form of the protection member in an Example. 実施例における防護部材の埋設形態の説明図である。It is explanatory drawing of the embedding form of the protection member in an Example. 従来の埋設物防護部材及び防護構造の例を示す断面説明図である。It is sectional explanatory drawing which shows the example of the conventional buried object protection member and protection structure. 従来の埋設物防護部材及び防護構造の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the conventional buried object protection member and protection structure. 従来の埋設物防護部材及び防護構造の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the conventional buried object protection member and protection structure. 従来の埋設物防護部材及び防護構造の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the conventional buried object protection member and protection structure. 従来の他の埋設物防護部材及び防護構造の他の例を示す断面説明図である。It is a section explanatory view showing other examples of other conventional buried object protection members and protection structures. 従来の埋設物防護部材及び防護構造の他の例を示す断面説明図である。It is sectional explanatory drawing which shows the other example of the conventional buried object protection member and protection structure.

Explanation of symbols

１：溝
11：溝の余空間
２：型枠
４：埋設物
５：自硬性充填材層(硬化層)
５_R：未硬化流動状態の自硬性充填材層
６：防護部材
7(71,72)：セラミックス板
８：金属板
９：路版層
１０：土層 1: Groove
11: Extra space in groove 2: Formwork 4: Embedded object 5: Self-hardening filler layer (hardened layer)
5 _R : self-curing filler layer in an uncured fluid state 6: protective member
7 (71, 72): Ceramic plate 8: Metal plate 9: Road plate layer 10: Soil layer

Claims

On the upper side of the buried object surrounded by the self-hardening filler layer and fixed in the groove, a cutting protection member for protecting the buried object from a cutting accident at the time of the road plate cutting work is disposed, and the road plate layer In the laying structure of underground objects covered with
The cutting protection member comprises a ceramic plate disposed on the self-hardening filler layer, and a metal plate placed in contact with the ceramic plate so as to cover the ceramic plate ,
The cutting protection member includes at least part of the metal plate in the plate thickness direction and the ceramic plate embedded in a surface layer of the self-hardening filler layer at a depth exceeding the plate thickness of the ceramic plate, The lower surface excluding the region in contact with the ceramic plate is fixed in a state of being in close contact with the self-hardening filler layer ,
Each of the upper surface of the ceramic plate and the lower surface of the metal plate in contact with the upper surface has a surface roughness of Ra: 1.5 μm or less and Ry: 10 μm or less, and a warp (C) of 2 mm or less. A structure for laying underground objects.

2. The underground laying structure according to claim 1, wherein the ceramic plates are disposed on both sides of the groove in the width direction and are disposed on the self-hardening filler layer.

3. The underground laying structure according to claim 1, wherein the ceramic plate is made of a titanium diboride ceramic, and the metal plate is made of an iron-based metal.

The underground laying structure according to any one of claims 1 to 3 , wherein the self-hardening filler is concrete or concrete mortar.

Cutting protection to protect the buried object from cutting accidents during road slab cutting by forming a self-hardening filler layer in the groove where the buried object is placed to form a self-hardening filler layer surrounding the buried object. In the method of laying underground objects to be covered with road plate layers after arranging the members,
The cutting protection member comprises a ceramic plate disposed on the self-hardening filler layer, and a metal plate placed in contact with the ceramic plate so as to cover the ceramic plate ,
Each of the upper surface of the ceramic plate and the lower surface of the metal plate in contact with the upper surface has a surface roughness of Ra: 1.5 μm or less and Ry: 10 μm or less, and a warp (C) of 2 mm or less.
While the surface layer of the self-hardening filler layer placed in the groove maintains an unsolidified flow state, the ceramic plate is disposed on the self-hardening filler layer and covers the ceramic plate. The metal plate is placed in contact with the ceramic plate, and at least part of the metal plate in the plate thickness direction and the ceramic plate are placed in the surface layer of the self-hardening filler layer to a depth exceeding the plate thickness of the ceramic plate. Underground, wherein the self-hardening filler layer is cured in a state where the lower surface of the metal plate except the region in contact with the ceramic plate is in close contact with the self-hardening filler layer How to lay buried objects.

The road plate layer covering the existing underground object is removed, the upper surface of the self-hardening filler layer surrounding the embedded object is exposed, and the buried object is protected from cutting accidents during road plate cutting work. In the laying method of underground objects to be covered with a road plate layer, after providing a cutting protection member for
The cutting protection member comprises a ceramic plate disposed on the self-hardening filler layer, and a metal plate placed in contact with the ceramic plate so as to cover the ceramic plate ,
Each of the upper surface of the ceramic plate and the lower surface of the metal plate in contact with the upper surface has a surface roughness of Ra: 1.5 μm or less and Ry: 10 μm or less, and a warp (C) of 2 mm or less.
A new self-hardening filler layer is formed by placing a self-hardening filler for fixing the cutting protection member on the upper surface of the self-hardening filler layer surrounding the buried object. While the surface layer of the material layer is kept in an unsolidified flow state, the ceramic plate is placed on the self-hardening filler layer and the metal plate is placed on the ceramic plate so as to cover the ceramic plate. In addition , at least part of the metal plate in the plate thickness direction and the ceramic plate are embedded in the surface layer of the self-hardening filler layer to a depth exceeding the plate thickness of the ceramic plate, A method for laying an underground object, wherein the self-hardening filler layer is cured in a state in which a lower surface excluding a region in contact with the ceramic plate is in close contact with the self-hardening filler layer.