Reinforcement method and reinforcement structure of a manhole

Patent metadata

Field	Value
Publication number	US-12077929-B2
Application number	US-201917047641-A
Country	US
Kind code	B2
Filing date	Mar 26, 2019
Priority date	Apr 16, 2018
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

Provided are a reinforcing method and a reinforcing structure for a manhole having a neck part in a position shifted from the middle part of an upper slab which allow the buried manhole to be reinforced sufficiently against stress inflicted thereon while reducing the operation and material costs involved in the reinforcement. The manhole reinforcing method according to the invention is a method for reinforcing a manhole including a rectangular trunk part having an upper slab, a sidewall, and a lower slab and a neck part provided in a position shifted from a middle part of the upper slab of the trunk part, the method includes providing a strip-shaped reinforcing member of reinforced fiber at the upper slab and the lower slab while refraining from providing the strip-shaped reinforcing member at the sidewall, and fixing an upper part of the sidewall and the upper slab and a lower part of the sidewall and the lower slab each by a reinforcing member at the middle part of the sidewall in the longitudinal direction of the trunk part.

First claim

The invention claimed is:

1. A reinforcement member of a structure buried underground for reinforcing the structure, the reinforcement member comprising:
a rectangular trunk,
wherein the rectangular trunk includes an upper slab, a sidewall, and a lower slab,
wherein the upper slab and the lower slab except the side wall include a plurality of strip-shaped reinforcing members using a reinforced fiber,
wherein a first set of reinforcing members fixes an upper part of the sidewall and the upper slab in a middle part of the sidewall in a longitudinal direction of the rectangular trunk, and
wherein a second set of the reinforcing members fixes a lower part of the sidewall and the lower slab in the middle part of the sidewall in the longitudinal direction of the rectangular trunk; and

a neck, wherein the neck is in a position shifted from a middle part of the upper slab of the rectangular trunk.

2. The reinforcement member of claim 1 , wherein a first area occupied by the first set of the strip-shaped reinforcing members on the upper slab is smaller than a second area occupied by the second set of the strip-shaped reinforcing member on the lower slab.

3. The reinforcement member of claim 1 , wherein the neck has a center position shifted toward one of end sides from a middle position of the rectangular trunk in the longitudinal direction, and
wherein a first area occupied by the first set of the strip-shaped reinforcing members on the upper slab on the other of the end sides from the middle section of the rectangular trunk is greater than a second area occupied by the first set of the strip-shaped reinforcing members on the one side of the end sides.

4. The reinforcement member of claim 1 , wherein the first set of the strip-shaped reinforcing members is in an in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

5. The reinforcement member of claim 2 , wherein the first set of the strip-shaped reinforcing members is in an in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

6. The reinforcement member of claim 3 , wherein the first set of the strip-shaped reinforcing members is in an in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

7. The reinforcement member of claim 2 , wherein the structure is based at least on a resin material, and wherein the second set of the strip-shaped reinforcing members on the lower slab provides as a body against a stress from the outside to the inside of the lower slab.

8. A method for reinforcing a structure buried underground, the method comprising:
fixing, using a first set of reinforcing members, an upper part of a sidewall and a upper slab in a middle part of the sidewall in a longitudinal direction of a rectangular trunk, wherein the structure includes the rectangular trunk and a neck, the rectangular trunk includes the upper slab, the side wall, and the lower slab, and the neck is in a position shifted from a middle part of the upper slab of the rectangular trunk;
fixing, using a second set of the reinforcing members, a lower part of the sidewall and the lower slab in the middle part of the sidewall in the longitudinal direction of the rectangular trunk; and
placing strip-shaped reinforcing members using reinforced fiber on the upper slab and the lower slab except the side wall.

9. The method of claim 8 , wherein a first area occupied by the first set of the strip-shaped reinforcing members on the upper slab is smaller than a second area occupied by the second set of the strip-shaped reinforcing member on the lower slab.

10. The method of claim 8 , wherein the neck has a center position shifted toward one of end sides from a middle position of the rectangular trunk in the longitudinal direction, and
wherein a first area occupied by the first set of the strip-shaped reinforcing members on the upper slab on the other of the end sides from the middle section of the rectangular trunk is greater than a second area occupied by the first set of the strip-shaped reinforcing members on the one side of the end sides.

11. The method of claim 8 , wherein the first set of the strip-shaped reinforcing members is in an in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

12. The method of claim 9 , wherein the first set of the strip-shaped reinforcing members is in an in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

13. The method of claim 10 , wherein the first set of the strip-shaped reinforcing members is in an in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

14. The method of claim 9 , wherein the structure is based at least on a resin material, and wherein the second set of the strip-shaped reinforcing members on the lower slab provides as a body against a stress from the outside to the inside of the lower slab.

15. A system of a reinforced structure buried underground, the system comprising:
a rectangular trunk,
wherein the rectangular trunk includes an upper slab, a sidewall, and a lower slab,
wherein the upper slab and the lower slab except the side wall include a plurality of strip-shaped reinforcing members using a reinforced fiber,
wherein a first set of reinforcing members fixes an upper part of the sidewall and the upper slab in a middle part of the sidewall in a longitudinal direction of the rectangular trunk, and
wherein a second set of the reinforcing members fixes a lower part of the sidewall and the lower slab in the middle part of the sidewall in the longitudinal direction of the rectangular trunk; and

a neck, wherein the neck is in a position shifted from a middle part of the upper slab of the rectangular trunk.

16. The system of claim 15 , wherein a first area occupied by the first set of the strip-shaped reinforcing members on the upper slab is smaller than a second area occupied by the second set of the strip-shaped reinforcing member on the lower slab.

17. The system of claim 15 , wherein the neck has a center position shifted toward one of end sides from a middle position of the rectangular trunk in the longitudinal direction, and
wherein a first area occupied by the first set of the strip-shaped reinforcing members on the upper slab on the other of the end sides from the middle section of the rectangular trunk is greater than a second area occupied by the first set of the strip-shaped reinforcing members on the one side of the end sides.

18. The system of claim 15 , wherein the first set of the strip-shaped reinforcing members is in the in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

19. The system of claim 16 , wherein the first set of the strip-shaped reinforcing members is in the in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

20. The system of claim 17 , wherein the first set of the strip-shaped reinforcing members is in the in-plane direction of the upper slab and in a direction orthogonal to the longitudinal direction of the rectangular trunk.

Assignees

• Nippon Telegraph & Telephone

Inventors

• Fujimoto Norihiro
• Nagai Tomoyasu
• Tsuda Shunsuke
• Sugiura Takashi

Classifications

• E02D2200/1642

  made from multiple elements · CPC title

• E02D29/12

  Manhole shafts; Other inspection or access chambers; Accessories therefor (for underground tanks B65D90/10; for sewerage E03F5/02 {; climbing irons or ladders E06C9/00}) · CPC title

• E02D29/121 Primary

  characterised by the connection between shaft elements, e.g. of rings forming said shaft · CPC title