JPS5811228A - Formation of lower mold for manhole steel cover - Google Patents

Formation of lower mold for manhole steel cover

Info

Publication number
JPS5811228A
JPS5811228A JP56106659A JP10665981A JPS5811228A JP S5811228 A JPS5811228 A JP S5811228A JP 56106659 A JP56106659 A JP 56106659A JP 10665981 A JP10665981 A JP 10665981A JP S5811228 A JPS5811228 A JP S5811228A
Authority
JP
Japan
Prior art keywords
steel cover
lower mold
manhole
steel
uppermost surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56106659A
Other languages
Japanese (ja)
Inventor
Kiyoshi Goto
清 後藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HOKUSEI CHUTETSU SEISAKUSHO GOUSHI
Original Assignee
HOKUSEI CHUTETSU SEISAKUSHO GOUSHI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HOKUSEI CHUTETSU SEISAKUSHO GOUSHI filed Critical HOKUSEI CHUTETSU SEISAKUSHO GOUSHI
Priority to JP56106659A priority Critical patent/JPS5811228A/en
Publication of JPS5811228A publication Critical patent/JPS5811228A/en
Pending legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
    • E02D29/14—Covers for manholes or the like; Frames for covers

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

PURPOSE:To raise the wear resistance of a manhole steel cover by a method in which a paint containing tellurium is coated on the lowest bottom of a lower mold for molding the uppermost surface of a steel cover and then molten steel is cast into the lower mold with the intention of raising the hardness of the uppermost surface part. CONSTITUTION:In manufacturing a steel cover for manhole, a paint TZ containing tellurium is coated on the lowest bottom 2 of a lower mold Pd formed in such a way that the multi-circular pattern M of a steel cover TB is positioned to be the uppermost surface. Then, said lower mold Pd is joined with an upper mold Pu and molten steel is cast into the molds to obtain a desired steel cover TB. Thus, only the pattern M on the surface of the steel cover TB thus molded is made harder by the hardening action of tellurium, and therefore, a manhole steel cover having excellent wear resistance withstanding the running of large- size vehicles can be manufactured.

Description

【発明の詳細な説明】 この発明はマンホール鉄蓋のための下型成型方法に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a lower mold for a manhole iron cover.

近ごろ、交通量の増大に加え大型車両の出現につづいて
、路上のマンホール鉄蓋の表面の摩滅することも激しく
なって来た。Recently, with the increase in traffic volume and the appearance of large vehicles, the surface of manhole covers on roads has become increasingly worn.

本発明の目的は上記の課題に対処するための発明にかか
わり、前述鉄蓋の表面の最上面、たとえば、凸状の模様
や記号の上面（これは鋳造用の下型でいえば鋳造面の最
底面に該当する部位である。）を鋳造と同時に表面硬化
の処理を行い、もつなわち、テ／ｌ／７１／による鉄管
表１ｉ処理による硬化性を利用したマンホール鉄蓋のた
めの下型成型方法を提供するものである。The object of the present invention is to solve the above-mentioned problems, and the top surface of the iron lid, for example, the top surface of the convex pattern or symbol (this is the casting surface of the lower die for casting). (This is the part corresponding to the bottom surface) is subjected to surface hardening treatment at the same time as casting, in other words, a lower mold for a manhole iron cover that utilizes the hardening properties of iron pipe Table 1i treatment according to Te/l/71/. The present invention provides a molding method.

次に１本発明方法の一実施例を示す図面を説明すると、
Ｐａは＃通用の上ＩＪおよびＰｄは同じく下型である。Next, a drawing showing an embodiment of the method of the present invention will be explained.
Pa is # common upper IJ and Pd is also lower type.

そして、下型Ｐｄにおいて、１はその鋳造面であって、
本例では多重円環状の模様Ｍの表面が最底面２として位
置している。次ｃ１この最底面２の部位にはテ５ｐｔｖ
Ｔｅを含む塗剤ＴＺが塗布される。それからは、従来の
ように上型Ｐａを重合してから、鋳造が行われる。この
ようにして鋳造された鉄！ＴＢでは完成後において、そ
の模様Ｍのみが表面硬化されるため、その耐摩性は特に
すぐれ、鉄蓋ＴＨの耐用度に著しい効果が発揮されるこ
とになる。In the lower mold Pd, 1 is its casting surface,
In this example, the surface of the multiple annular pattern M is positioned as the bottom surface 2. Next c1 This bottom 2 part has Te5ptv
A paint TZ containing Te is applied. Thereafter, the upper mold Pa is polymerized in the conventional manner, and then casting is performed. Iron cast in this way! In TB, only the pattern M is surface hardened after completion, so its wear resistance is particularly excellent, and a remarkable effect is exerted on the durability of the iron lid TH.

本発明方法は特許請求の範囲に記載された方法を要旨と
するもので、上記した効果を有し、その結果物である鉄
蓋を耐摩性にすぐれたものとしうるため、本発明方法は
鋳造業界の分野の一つに寄与するところ大きい発明であ
る。The method of the present invention is based on the method described in the claims, and has the above-mentioned effects, and the resulting iron lid can be made to have excellent wear resistance. This is a major invention that contributes to one field of industry.

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

１１１１図は本発明方法による下型を主体とする側断面
図、第２図は鉄蓋の一つを示す平面図である。 ＴｏはＴｌｋ／ＩＬ’、Ｐｕは上型、Ｐｄは下型、１は
模様Ｍをもつ鋳造面および２はその最底面である。 第１図 第２図Fig. 1111 is a side sectional view mainly showing the lower mold according to the method of the present invention, and Fig. 2 is a plan view showing one of the iron lids. To is Tlk/IL', Pu is the upper mold, Pd is the lower mold, 1 is the casting surface with the pattern M, and 2 is the bottom surface thereof. Figure 1 Figure 2

Claims (1)

【特許請求の範囲】 鋳造用の下型の鋳造面１のうち、最底面２０面上にはデ
ル、４／Ｔ・を含む塗剤ＴＺを塗布してから。 この下型Ｐｄと上［１ｊＰｍにてマンホール鉄蓋を鋳造
することを特徴とするマーホール鉄蓋のための下型成型
方法。[Claims] After coating the bottom 20 of the casting surfaces 1 of the lower die for casting, a paint TZ containing Del, 4/T. A method for forming a lower mold for a manhole iron cover, characterized in that the lower mold Pd and the upper mold [1jPm] are used to cast the manhole iron cover.
JP56106659A 1981-07-07 1981-07-07 Formation of lower mold for manhole steel cover Pending JPS5811228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56106659A JPS5811228A (en) 1981-07-07 1981-07-07 Formation of lower mold for manhole steel cover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56106659A JPS5811228A (en) 1981-07-07 1981-07-07 Formation of lower mold for manhole steel cover

Publications (1)

Publication Number Publication Date
JPS5811228A true JPS5811228A (en) 1983-01-22

Family

ID=14439215

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56106659A Pending JPS5811228A (en) 1981-07-07 1981-07-07 Formation of lower mold for manhole steel cover

Country Status (1)

Country Link
JP (1) JPS5811228A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03131281A (en) * 1989-10-17 1991-06-04 Nippon Dry Chem Co Ltd Disaster preventing equipment of road tunnel
US11891825B2 (en) * 2018-10-02 2024-02-06 Independence Materials Group, Llc Apparatus for supporting overhead structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03131281A (en) * 1989-10-17 1991-06-04 Nippon Dry Chem Co Ltd Disaster preventing equipment of road tunnel
US11891825B2 (en) * 2018-10-02 2024-02-06 Independence Materials Group, Llc Apparatus for supporting overhead structure

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