JPH0457590U - - Google Patents

Info

Publication number

JPH0457590U

JPH0457590U JP9890490U JP9890490U JPH0457590U JP H0457590 U JPH0457590 U JP H0457590U JP 9890490 U JP9890490 U JP 9890490U JP 9890490 U JP9890490 U JP 9890490U JP H0457590 U JPH0457590 U JP H0457590U

Authority

JP

Japan

Prior art keywords

concrete layer

layer

pipe

main body

concrete

Prior art date

1990-09-19

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.)

Granted

Links

• Espacenet
• Global Dossier
• Discuss

• 230000037431 insertion Effects 0.000 claims description 4
• 238000003780 insertion Methods 0.000 claims description 4
• 239000010410 layer Substances 0.000 claims 16
• 230000003014 reinforcing effect Effects 0.000 claims 3
• 230000002093 peripheral effect Effects 0.000 claims 2
• 239000011247 coating layer Substances 0.000 claims 1
• 238000010586 diagram Methods 0.000 description 2
• 238000009434 installation Methods 0.000 description 1
• 230000002787 reinforcement Effects 0.000 description 1