Reinforcement methods for underground structures

Abstract

The present invention is a reinforcement method for an underground embedded structure 20 embedded in the ground 1000, the method including: an excavating step for excavating the ground 1000 in the vicinity of a side section of the underground embedded structure 20; an installing step for installing a partition 114 that covers at least a portion of the side section of the underground embedded structure 20 so that a space is formed between the side section and a partition 124; and a step for curing by causing a flowable solidification material to flow into the space.

Description

Technical Field

[0006] , , ,

[0001] The present disclosure relates to a method for reinforcing buried structures.

Background Art

[0007] A method for reinforcing an underground structure according to one embodiment is a method for reinforcing an underground structure buried in the ground, and includes the steps of: excavating the ground located near the side of the underground structure; providing a partition that covers at least a part of the side of the underground structure such that a space is formed between the side and the partition; and pouring a fluid solidifying material into the space and hardening it. [Effects of the Invention]

[0008] According to the method for reinforcing underground structures described herein, buried underground structures can be reinforced without affecting their contents. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view showing the structure after reinforcement of an underground buried structure reinforced by a reinforcement method according to one embodiment of the present disclosure. [Figure 2A] This is a cross-sectional view showing the state after the removal step of a reinforcement method according to one embodiment of the present disclosure. [Figure 2B] This is a cross-sectional view showing the state after the excavation step of a reinforcement method according to one embodiment of the present disclosure. [Figure 2C] This is a cross-sectional view showing the state after the installation step of a reinforcement method according to one embodiment of the present disclosure. [Figure 2D] This is a cross-sectional view showing the state after the hardening step of a reinforcement method according to one embodiment of the present disclosure. [Figure 2E] This is a cross-sectional view showing the state after a different partition than the one shown in Figure 2C has been installed in the installation step of a reinforcement method according to one embodiment of the present disclosure. [Figure 3] This flowchart shows an example of a reinforcement method according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0010] A method for reinforcing an underground structure according to one embodiment of this disclosure will be described below with reference to the drawings.

[0011] (Underground structure after reinforcement) Figure 1 is a cross-sectional view of a reinforced underground structure 120. The reinforced underground structure 120 may be formed by applying a reinforcement method according to one embodiment of the present disclosure to an underground structure 20. The reinforced underground structure 120 is buried in the ground 1000. An upper structure 110 including a cover 111 may be attached to the underground structure 20.

[0012] The superstructure 110 may include a lid 111, a receiving frame 112, a neck ring 113, and an adapter 114.

[0013] The cover 111 may be rectangular when viewed from above while attached to the reinforced underground structure 120. The cover 111 may be circular or have other shapes when viewed from above while attached to the reinforced underground structure 120. The cover 111 may be exposed on the ground surface. The cover 111 may be made of iron.

[0014] 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.

[0015] The neck ring 113 may be rectangular when viewed from above. The superstructure 110 may have one or more neck rings 113. The superstructure 110 does not have to have neck rings 113. The number of neck rings 113 may be determined by the installation environment. Specifically, in configurations where the reinforced underground structure 120 is buried to a deep depth, the number of neck rings 113 may increase. 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.

[0016] The adapter 114 may be in the shape of 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 the side surface of the receiving frame 112 by an anchor bolt. The bottom surface 114b may be connected to the 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.

[0017] The underground buried structure 20 may be in the shape of a hollow rectangular parallelepiped. The underground buried structure 20 may include a side wall 21 and a bottom slab 22. Instead of these configurations, the underground buried structure 20 may be cylindrical. The underground buried structure 20 may have an opening 20о at the upper part. Cables and the like may pass through the inside of the underground buried structure 20. The side wall 21 may have an opening. Cables and the like 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.

[0018] The underground buried structure 20 may be made of unreinforced concrete. In this configuration, the influence of the aging deterioration of the underground buried structure 20 becomes large, and the reinforcement effect by the reinforcement wall 123 and the partition 124 described later may be higher.

[0019] The side wall 21 and the bottom slab 22 may be flat plates. The upper surface of the side wall 21 and the bottom surface of the upper structure 110 (for example, the neck ring 113) may be adhered by an anchor bolt or the like. The total thickness of the side wall 21 and the bottom slab 22 is, for example, 10 cm. The height h of the side wall 21 may be, for example, 60 cm to 185 cm.

[0020] The reinforced underground buried structure 120 further includes a reinforcement wall 123 and a partition 124.

[0021] The reinforcing wall 123 can improve the strength of the reinforced underground structure 120. The reinforcing wall 123 may be rectangular in shape. The reinforcing wall 123 may be fixed to the underground structure 20. Specifically, the surface of the reinforcing wall 123 facing the underground structure 20 may be bonded to the side wall 21 of the underground structure 20. The superstructure 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 top surface of the reinforcing wall 123 with anchor bolts or the like.

[0022] 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 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 a hardened solidifying material. The reinforcing wall 123 may be made of a solidifying material such as concrete or mortar. The reinforcing wall 123 may be made of a high-strength or rapid-hardening material.

[0023] The partition 124 may include a side wall 124s and a bottom wall 124b. The side wall 124s and the bottom wall 124b may be bonded together with an adhesive to form a single unit. 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.

[0024] The side wall 124s may extend parallel to the side wall 21 of the underground structure 20. The height of the side wall 124s may be equal to the height of the side wall 21.

[0025] The bottom wall 124b may extend perpendicularly to the side wall 21 of the underground structure 20. The bottom wall 124b may be rectangular ring-shaped when viewed from above. In other words, an opening may be formed in the bottom wall 124b. The lower floor slab 22 may be located in this opening.

[0026] Another example of a partition may consist only of side walls 124s. In other words, the partition may be rectangular in shape. This configuration is effective, for example, when the ground 1000 is clayey and impermeable to the solidifying agent.

[0027] The superstructure 110 may rest on the reinforcing wall 123 and the partition 124. The superstructure 110 does not have to rest on the side wall 21. The superstructure 110 may rest only on the reinforcing wall 123. The superstructure 110 may be fixed only on the reinforcing wall 123.

[0028] (Reinforcement method) Hereinafter, a reinforcement method according to one embodiment of this disclosure will be described with reference to Figures 1, 2A to 2E, and 3. Figure 3 is a flowchart of the reinforcement method according to one embodiment of this disclosure.

[0029] Referring to Figure 2A, in step S10 (see Figure 3), the superstructure 110 (see Figure 1) is removed from the underground structure 20. If the upper surface of the side wall 21 of the underground structure 20 and the bottom surface of the superstructure 110 are fixed with anchor bolts, the superstructure 110 may be removed after the upper surface of the side wall 21 and the bottom surface of the superstructure 110 have been separated. More specifically, the superstructure 110 may be removed after the upper surface of the side wall 21 and the neck ring 113 have been separated. Referring to Figure 1, the receiving frame 112 and the neck ring 113 may be separated before or after the separation of the upper surface of the side wall 21 and the neck ring 113.

[0030] During or before step S10, the ground 1000 surrounding the superstructure 110 may be removed. Removing the ground 1000 may facilitate the separation or removal of the underground structure 20 from the bottom surface of the superstructure 110, and may also shorten the time required for step S20, which will be described later.

[0031] Referring to Figure 2B, in step S20 (see Figure 3), the ground 1000 located near the side (outer perimeter) of the underground structure 20 is excavated. If the underground structure 20 is a hollow rectangular parallelepiped, the ground 1000 outside the four side walls 21 of the underground structure 20 may be excavated with an excavation width w perpendicular to the side walls 21 and to an excavation depth (depth from the surface of the ground 1000) d. Alternatively, only the ground 1000 outside three or fewer side walls 21 of the underground structure 20 may be excavated.

[0032] 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, a ground 1000 with a width w that allows for the installation of the reinforcing wall 123 and the partition 124 may be excavated.

[0033] The excavation depth d may be equal to the depth of the bottom surface of the underground structure 20. In other words, the ground 1000 may be excavated up to the bottom of the underground structure 20 (to the same depth as the bottom surface of the lower slab 22). Specifically, the excavation depth d may be between 60 cm and 185 cm.

[0034] Referring to Figure 2C, in step S30 (see Figure 3), a partition 124 is installed to cover at least a portion of the side (side wall 21) of the underground structure 20, such 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 structure 20. The partition 124 may be installed on the outside of the underground structure 20. For example, the partition 124 may be installed so that the lower floor slab 22 of the underground structure 20 is located in the opening formed in the bottom wall 124b of the partition 124.

[0035] After the partition 124 is installed, a space 125 is formed between the side of the underground 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 rod or the like.

[0036] The partition 124 may be formed before step S10. In another example, in 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 (each cylindrical) side walls 124s may be bonded together via the adhesive to form the partition 124.

[0037] Referring to Figure 2D, in step S40 (see Figure 3), a fluid solidifying agent is poured into the space 125 (see Figure 2C) between the side (side wall 21) of the underground structure 20 and the partition 124 to harden. If the underground structure 20 is rectangular, the solidifying agent may flow over each of the four side walls 21 of the underground structure 20.

[0038] The hardened solidifying material forms the reinforcing wall 123. After the fluid solidifying material flows into the space between the side wall 21 and the partition 124 of the underground buried structure 20, it may be cured for a predetermined curing period. The solidifying material may harden during the curing period. The curing period may be 30 minutes to 1 hour. If the solidifying material is rapid-hardening mortar, the curing period may be shortened.

[0039] Referring to Figure 1, the superstructure 110 may be attached in step S50 (see Figure 3). The superstructure 110 may be attached on top of the reinforcing wall 123, and this configuration reduces the load on the underground structure 20. Therefore, the durability of the reinforced underground structure 120 may be further improved. In addition, the safety of the reinforced underground structure 120 may be improved. The superstructure 110 may be attached to the underground structure 20.

[0040] In step S50, more specifically, the neck ring 113 may be installed on the upper surface of the reinforcing wall 123. Next, anchor bolts may be inserted through the neck ring 113 and the reinforcing wall 123 to connect the neck ring 113 and the reinforcing wall 123. After that, the adapter 114 may be installed on the upper surface of the neck ring 113. Next, anchor bolts may be inserted through the adapter 114 and the neck ring 113 to connect the adapter 114 and the neck ring 113. After that, the receiving frame 112 may be installed inside the adapter 114. Next, anchor bolts may be inserted through the adapter 114 to connect the receiving frame 112 and the adapter 114. After that, the lid 111 may be placed on top of the receiving frame 112.

[0041] During or after step S50, the ground 1000 may be refilled on the side of the superstructure 110.

[0042] A partition of a different shape from partition 124 may be installed. For example, in step S30, a partition 224 including an inclined side wall 224s and a bottom wall 224b, as shown in Figure 2E, may be installed. An acute angle θ is formed between the inclined side wall 224s and the bottom wall 224b. θ may be, for example, 60° to 85°. Partition 224 may be molded by a mold before step S10. After partition 224 covering at least a portion of the side of the underground structure 20 is installed, the width wn between the upper end of partition 224 and the side wall 21 of the underground structure 20 may be 2 to 3 cm. During or after step S50, the ground 1000 may be refilled around partition 224 and the side of the superstructure 110.

[0043] Generally, the pressure from the ground 1000 increases with depth. When a partition 224 including an inclined side wall 224s is installed, after step S40 of this embodiment is completed, a reinforcing wall is formed between the side of the underground buried structure 20 and the partition 224, tapering upwards. In other words, the width of the reinforcing wall increases with depth. Therefore, the amount of hardening material to be cured can be reduced while ensuring durability against the pressure applied from the ground 1000. In addition, the curing period can be shortened.

[0044] The following additional information is disclosed regarding the embodiments described above.

[0045] (Additional note 1) A method for reinforcing underground structures buried in the ground, An excavation step for excavating the ground located near the side of the aforementioned underground buried structure, Installation step: Install a partition that covers at least a portion of the side of the underground structure such that a space is formed between the side and the partition. A curing step in which a fluid solidifying agent is poured into the aforementioned space and hardened, A method for reinforcing underground structures, including [the specified method]. (Additional note 2) The superstructure is attached to the underground structure which is buried in the ground. A removal step for removing the superstructure from the underground buried structure, Mounting steps for attaching the superstructure, A method for reinforcing underground structures as described in Appendix 1, further including the above. (Additional note 3) The method for reinforcing an underground structure as described in Appendix 2, wherein in the installation step, the superstructure is installed on top of the hardened solidifying material. (Additional note 4) A method for reinforcing an underground structure as described in Appendix 2 or 3, wherein in the installation step, the superstructure is fixed to the hardened solidifying material. (Additional note 5) The partition includes a bottom wall and side walls, A method for reinforcing an underground structure according to any one of the appendices 1 to 4, wherein the size of the cross section obtained by cutting the side wall with a plane parallel to the bottom wall decreases as the cross section moves away from the bottom wall.

[0046] Although the embodiments described above are representative examples, it will be apparent to those skilled in the art that many modifications and substitutions are possible within the spirit and scope of this disclosure. Therefore, the present invention should not be construed as being limited by the embodiments described above, and various modifications or changes are possible without departing from the claims. [Explanation of Symbols]

[0047] 110 Superstructure 111 Lid 112 slots 112r receiving part 113 Neck ring 114 Adapter 114b Bottom 114s side 20 Underground structures 20о opening 21 Side wall 22 Lower floor version 120 Reinforced underground structures 123 Reinforced wall 124 dividers 124b Bottom wall 124s side wall 125 Space 224 dividers 224b Bottom wall 224s sloped side wall 1000 ground d. Drilling depth h Height of the side wall of the underground structure h' Height of the reinforcing wall t Thickness of the reinforcing wall t' Thickness of the side wall of the partition w Excavation width wn Width between the top of the partition and the side wall of the underground structure θ angle

Claims

1. A method for reinforcing underground structures buried in the ground, An excavation step for excavating the ground located near the side of the aforementioned underground buried structure, Installation step: Install a partition that covers at least a portion of the side of the underground structure such that a space is formed between the side and the partition. A curing step in which a fluid solidifying agent is poured into the aforementioned space and hardened, A method for reinforcing underground structures, including [the specified method].

2. The superstructure is attached to the underground structure which is buried in the ground. A removal step for removing the superstructure from the underground buried structure, Mounting steps for attaching the superstructure, A method for reinforcing an underground structure according to claim 1, further comprising:

3. The method for reinforcing an underground structure according to claim 2, wherein in the installation step, the superstructure is installed on top of the hardened solidifying material.

4. The method for reinforcing an underground structure according to claim 2 or 3, wherein in the installation step, the superstructure is fixed to the hardened solidifying material.

5. The partition includes a bottom wall and side walls, The method for reinforcing an underground structure according to claim 1 or 2, wherein the size of the cross-section obtained by cutting the side wall with a plane parallel to the bottom wall decreases as the cross-section moves away from the bottom wall.

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