WO2024150279A1 - 地中埋設型構造物の補強方法 - Google Patents

地中埋設型構造物の補強方法 Download PDF

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Publication number
WO2024150279A1
WO2024150279A1 PCT/JP2023/000334 JP2023000334W WO2024150279A1 WO 2024150279 A1 WO2024150279 A1 WO 2024150279A1 JP 2023000334 W JP2023000334 W JP 2023000334W WO 2024150279 A1 WO2024150279 A1 WO 2024150279A1
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WIPO (PCT)
Prior art keywords
buried structure
underground buried
reinforcing
underground
partition
Prior art date
Application number
PCT/JP2023/000334
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English (en)
French (fr)
Japanese (ja)
Inventor
琢也 石川
潤一郎 玉松
亮 田中
安弘 松本
Original Assignee
日本電信電話株式会社
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 日本電信電話株式会社 filed Critical 日本電信電話株式会社
Priority to JP2024569697A priority Critical patent/JPWO2024150279A1/ja
Priority to PCT/JP2023/000334 priority patent/WO2024150279A1/ja
Publication of WO2024150279A1 publication Critical patent/WO2024150279A1/ja

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    • 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
    • E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them

Definitions

  • This disclosure relates to a method for reinforcing an underground structure.
  • underground structures such as handholes that house cables, equipment, etc. and are buried in the ground. Buried underground structures are subject to vehicle wheel loads, earth pressure, water pressure, etc. These loads cause the underground structures to deteriorate over time, for example to deform.
  • Non-Patent Document 1 describes a method of reinforcing the inner surface of a handhole by attaching an aramid fiber sheet to the surface.
  • the present disclosure therefore aims to provide a method for reinforcing buried underground structures without affecting their contents.
  • a method for reinforcing an underground buried structure is a method for reinforcing an underground buried structure buried in the ground, and includes the steps of excavating the ground located near a side of the underground buried structure, providing a partition covering at least a portion of the side of the underground buried structure such that a space is formed between the side and the partition, and pouring a fluid solidification material into the space and allowing it to harden.
  • the method of reinforcing an underground buried structure disclosed herein allows the buried underground structure to be reinforced without affecting its contents.
  • FIG. 1 is a cross-sectional view showing a structure after reinforcement of an underground buried structure reinforced by a reinforcing method according to an embodiment of the present disclosure.
  • 1 is a cross-sectional view showing a state after a removal step of a reinforcement method according to an embodiment of the present disclosure.
  • 1 is a cross-sectional view of a reinforcement method according to an embodiment of the present disclosure, showing a state after an excavation step.
  • FIG. 1 is a cross-sectional view of a reinforcement method according to an embodiment of the present disclosure, showing a state after an installation step.
  • FIG. 2 is a cross-sectional view of a reinforcement method according to an embodiment of the present disclosure after a curing step.
  • FIG. 2C is a cross-sectional view showing a state after a partition different from that shown in FIG. 2C has been installed in an installation step of a reinforcement method according to one embodiment of the present disclosure.
  • 1 is a flowchart illustrating an example of a reinforcement method according to an embodiment of the present disclosure.
  • (Reinforced underground structure) 1 is a cross-sectional view of a reinforced underground buried structure 120.
  • the reinforced underground buried structure 120 may be formed by applying a reinforcing method according to an embodiment of the present disclosure to the underground buried structure 20.
  • the reinforced underground buried structure 120 is buried in the ground 1000.
  • a superstructure 110 including a lid 111 may be attached to the underground buried structure 20.
  • the upper structure 110 may include a lid 111, a receiving frame 112, a neck ring 113, and an adapter 114.
  • the lid 111 may be rectangular when viewed from above when attached to the reinforced underground buried structure 120.
  • the lid 111 may be circular or have another shape when viewed from above when attached to the reinforced underground buried structure 120.
  • the lid 111 may be exposed to the ground surface.
  • the lid 111 may be made of iron.
  • the receiving frame 112 may be shaped to receive the lid 111.
  • the receiving frame 112 may include a rectangular ring-shaped receiving portion 112r that receives the lid 111.
  • the receiving frame 112 may be made of iron.
  • the neck ring 113 may be a rectangular ring when viewed from above.
  • the upper structure 110 may have one or more neck rings 113.
  • the upper structure 110 may not have a neck ring 113.
  • the number of neck rings 113 may be determined according to the installation environment. Specifically, in a configuration in which the reinforced underground buried structure 120 is buried deeply, the number of neck rings 113 may be increased.
  • the neck ring 113 may be connected to the upper surface of the reinforcing wall 123 by anchor bolts.
  • the neck ring 113 may be made of concrete.
  • the adapter 114 may be a rectangular ring when viewed from above.
  • the adapter 114 may have a side surface 114s and a bottom surface 114b.
  • the side surface 114s may be connected to a side surface of the receiving frame 112 by an anchor bolt.
  • the bottom surface 114b may be connected to an upper surface of the neck ring by an anchor bolt.
  • the adapter 114 may be made of iron.
  • the lid 111 and the adapter 114 may be integrated.
  • the underground buried structure 20 may be a hollow rectangular parallelepiped.
  • the underground buried structure 20 may include a side wall 21 and a lower deck 22. Alternatively to these configurations, the underground buried structure 20 may be cylindrical.
  • the underground buried structure 20 may have an opening 20 Kab at the top. Cables, etc. may pass through the interior of the underground buried structure 20.
  • the side wall 21 may have an opening. Cables, etc. may pass through the opening.
  • the underground buried structure 20 may be a handhole.
  • the underground buried structure 20 is buried in the ground 1000.
  • the underground buried structure 20 may be made of unreinforced concrete. In this configuration, the underground buried structure 20 is more susceptible to deterioration over time, and the reinforcing effect of the reinforcing walls 123 and partitions 124 described below may be greater.
  • the side walls 21 and the lower deck 22 may be flat.
  • the upper surface of the side walls 21 and the bottom surface of the upper structure 110 e.g., the neck ring 113
  • the sum of the thickness t of the side walls 21 and the thickness of the lower deck 22 is, for example, 10 cm.
  • the height h of the side walls 21 may be, for example, 60 cm to 185 cm.
  • the reinforced underground structure 120 further includes a reinforcing wall 123 and a partition 124.
  • the reinforcing wall 123 can improve the strength of the reinforced underground buried structure 120.
  • the reinforcing wall 123 may be in the shape of a square tube.
  • the reinforcing wall 123 may be fixed to the underground buried structure 20. Specifically, the surface of the reinforcing wall 123 facing the underground buried structure 20 may be bonded to the side wall 21 of the underground buried structure 20.
  • the upper structure 110 may be fixed on top of the reinforcing wall 123. Specifically, the bottom surface of the neck ring 113 may be connected to the upper surface of the reinforcing wall 123 by an anchor bolt or the like.
  • the thickness t of the reinforcing wall 123 is, for example, 9 cm.
  • the thickness t may be determined according to the required strength of the reinforced underground buried structure 120.
  • the sum of the height h' of the reinforcing wall 123 and the thickness of the bottom wall 124b of the partition 124 may be equal to the height h of the side wall 21.
  • the height h' may be, for example, 55 cm to 180 cm.
  • the reinforcing wall 123 may be made of a hardened solidifying material.
  • the reinforcing wall 123 may be made of a solidifying material such as concrete, mortar, etc.
  • the reinforcing wall 123 may be made of a high-strength or early-strength material.
  • the partition 124 may have a side wall 124s and a bottom wall 124b.
  • the side wall 124s and the bottom wall 124b may be integrated by being bonded with an adhesive. If the side wall 124s and the bottom wall 124b are made of resin, the adhesion between the side wall 124s and the bottom wall 124b may be improved.
  • the partition 124 may be made of concrete or the like.
  • the side wall 124s may extend parallel to the side wall 21 of the underground buried structure 20.
  • the height of the side wall 124s may be equal to the height of the side wall 21.
  • the bottom wall 124b may extend perpendicularly to the side wall 21 of the underground buried structure 20.
  • the bottom wall 124b may be in the shape of a rectangular ring when viewed from above. In other words, an opening may be formed in the bottom wall 124b.
  • the lower deck 22 may be located in the opening.
  • partition may have only side walls 124s.
  • the partition may be rectangular tubular. This configuration is effective, for example, when the ground 1000 is clayey, which makes it difficult for the solidification material to pass through.
  • the upper structure 110 may rest on the reinforcing wall 123 and the partition 124.
  • the upper structure 110 does not have to rest on the side wall 21.
  • the upper structure 110 may rest only on the reinforcing wall 123.
  • the upper structure 110 may be fixed only on the reinforcing wall 123.
  • FIG. 1 is a flow chart showing the reinforcing method according to an embodiment of the present disclosure.
  • step S10 the superstructure 110 (see FIG. 1) is removed from the underground buried structure 20.
  • the upper surface of the sidewall 21 of the underground buried structure 20 and the bottom surface of the superstructure 110 are fixed with anchor bolts, the upper surface of the sidewall 21 and the bottom surface of the superstructure 110 may be separated, and then the superstructure 110 may be removed. More specifically, the upper surface of the sidewall 21 and the neck ring 113 may be separated, and then the superstructure 110 may be removed.
  • the receiving frame 112 and the neck ring 113 may be separated before or after the upper surface of the sidewall 21 and the neck ring 113 are separated.
  • step S10 the ground 1000 around the superstructure 110 may be removed. Removing the ground 1000 may facilitate separation or removal of the underground buried structure 20 and the bottom surface of the superstructure 110, and may shorten the time required for step S20, which will be described later.
  • step S20 the ground 1000 located near the side (outer periphery) of the underground-buried structure 20 is excavated.
  • the underground-buried structure 20 is a hollow rectangular parallelepiped
  • the ground 1000 outside the four side walls 21 of the underground-buried structure 20 may be excavated to an excavation depth (depth from the surface of the ground 1000) d with an excavation width w perpendicular to the side walls 21. Only the ground 1000 outside three or fewer side walls 21 of the underground-buried structure 20 may be excavated.
  • the excavation width w may be equal to the sum of the thickness t of the reinforcing wall 123 and the thickness t' of the side wall 124s of the partition 124, which will be installed later. Specifically, the excavation width w may be 10 cm. In other words, the ground 1000 may be excavated to a width w that allows the installation of the reinforcing wall 123 and the partition 124.
  • the excavation depth d may be equal to the depth of the bottom surface of the underground buried structure 20.
  • the ground 1000 may be excavated up to the bottom of the underground buried structure 20 (up to the same depth as the bottom surface of the lower deck 22).
  • the excavation depth d may be 60 cm to 185 cm.
  • a partition 124 that covers at least a portion of the side (side wall 21) of the underground buried structure 20 is installed so that a space is formed between the side and the partition 124. More specifically, the partition 124 may be installed so that the depth of the bottom surface of the partition 124 is equal to the depth of the bottom surface of the underground buried structure 20.
  • the partition 124 may be installed outside the underground buried structure 20. For example, the partition 124 may be installed so that the lower deck 22 of the underground buried structure 20 is positioned in an opening formed in the bottom wall 124b of the partition 124.
  • a space 125 is formed between the side of the underground buried structure 20 and the partition 124. Gravel may be laid at the bottom of the space 125. The bottom of the space 125 may be compacted with a stick or the like.
  • the partition 124 may be formed before step S10.
  • step S30 only the bottom wall 124b, which is not connected to the side walls 124s, may be placed at the bottom of the excavated area. Then, adhesive may be applied to the periphery of the upper surface of the bottom wall 124b, and the (cylindrical) side walls 124s may be bonded to the adhesive to form the partition 124.
  • step S40 in step S40 (see FIG. 3), a fluid solidification material is poured into the space 125 (see FIG. 2C) between the side (side wall 21) of the underground buried structure 20 and the partition 124, and hardened. If the underground buried structure 20 is a rectangular parallelepiped, the solidification material may flow onto each of the four side walls 21 of the underground buried structure 20.
  • the hardened solidification material forms the reinforcing wall 123.
  • the fluid solidification material flows into the space between the side wall 21 of the underground buried structure 20 and the partition 124, it may be cured for a predetermined curing period.
  • the curing may harden the solidification material.
  • the curing period may be 30 minutes to 1 hour. If the solidification material is high-early-strength mortar, the curing period may be shortened.
  • the superstructure 110 may be attached.
  • the superstructure 110 may be attached on top of the reinforcing wall 123, and this configuration reduces the load applied to the underground buried structure 20. Therefore, the durability of the reinforced underground buried structure 120 may be further improved. In addition, the safety of the reinforced underground buried structure 120 may be improved.
  • the superstructure 110 may be attached to the underground buried structure 20.
  • the neck ring 113 may be installed on the upper surface of the reinforcing wall 123.
  • an anchor bolt may be inserted into the neck ring 113 and the reinforcing wall 123 to connect the neck ring 113 and the reinforcing wall 123.
  • the adapter 114 may be installed on the upper surface of the neck ring 113.
  • an anchor bolt may be inserted into the adapter 114 and the neck ring 113 to connect the adapter 114 and the neck ring 113.
  • the receiving frame 112 may be installed inside the adapter 114.
  • an anchor bolt may be inserted into the receiving frame 112 and the adapter 114 to connect the receiving frame 112 and the adapter 114.
  • the lid 111 may be placed on top of the receiving frame 112.
  • the ground 1000 may be refilled on the side of the superstructure 110.
  • a partition having a different shape from the partition 124 may be installed.
  • a partition 224 including an inclined side wall 224s and a bottom wall 224b as shown in FIG. 2E may be installed.
  • An acute angle ⁇ is formed between the inclined side wall 224s and the bottom wall 224b.
  • ⁇ may be, for example, 60° to 85°.
  • the partition 224 may be shaped by a mold before step S10. After the partition 224 covering at least a part of the side of the underground buried structure 20 is installed, the width wn between the upper end of the partition 224 and the side wall 21 of the underground buried structure 20 may be 2 to 3 cm.
  • the ground 1000 may be refilled at the side of the partition 224 and the upper structure 110.
  • the pressure from the ground 1000 increases with depth.
  • a partition 224 including an inclined side wall 224s is installed, after step S40 of this embodiment is completed, a reinforcing wall that tapers upward is formed between the side of the underground buried structure 20 and the partition 224.
  • the width of the reinforcing wall increases with depth. Therefore, the amount of solidifying material to be hardened can be reduced while ensuring durability against pressure applied from the ground 1000. Also, the curing period can be shortened.
  • a method for reinforcing an underground structure buried in the ground comprising the steps of: An excavation step of excavating the ground located near a side of the underground buried structure; an installation step of installing a partition covering at least a part of a side of the underground buried structure such that a space is formed between the side and the partition; a hardening step of pouring a fluid solidification material into the space and hardening the material;
  • a method for reinforcing an underground buried structure comprising: (Additional Note 2) a superstructure is attached to the underground buried structure buried in the ground, a removal step of removing the superstructure from the underground buried structure; an attachment step of attaching the superstructure;
  • (Additional Note 4) 4. The method for reinforcing an underground buried structure according to claim 2 or 3, wherein in the mounting step, a superstructure is fixed to the hardened solidification material.
  • the partition includes a bottom wall and a side wall; A method for reinforcing an underground buried structure according to any one of claims 1 to 4, wherein the size of a cross section of the side wall cut by a plane parallel to the bottom wall becomes smaller as the cross section moves away from the bottom wall.

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  • 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)
PCT/JP2023/000334 2023-01-10 2023-01-10 地中埋設型構造物の補強方法 WO2024150279A1 (ja)

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JP2024569697A JPWO2024150279A1 (enrdf_load_stackoverflow) 2023-01-10 2023-01-10
PCT/JP2023/000334 WO2024150279A1 (ja) 2023-01-10 2023-01-10 地中埋設型構造物の補強方法

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62151788A (ja) * 1985-12-26 1987-07-06 株式会社竹中工務店 原子力建屋における埋込部外壁の土圧軽減方法
JP2006138091A (ja) * 2004-11-11 2006-06-01 Elf:Kk タンク類埋設工法
JP2016108815A (ja) * 2014-12-05 2016-06-20 株式会社ダイフレックス 防水構造および防水工法
JP2017096063A (ja) * 2015-11-27 2017-06-01 鹿島建設株式会社 山留掘削工法及び躯体構築方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62151788A (ja) * 1985-12-26 1987-07-06 株式会社竹中工務店 原子力建屋における埋込部外壁の土圧軽減方法
JP2006138091A (ja) * 2004-11-11 2006-06-01 Elf:Kk タンク類埋設工法
JP2016108815A (ja) * 2014-12-05 2016-06-20 株式会社ダイフレックス 防水構造および防水工法
JP2017096063A (ja) * 2015-11-27 2017-06-01 鹿島建設株式会社 山留掘削工法及び躯体構築方法

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