JP-7854799-B2 - Composite segments and earth retaining structures

JP7854799B2JP 7854799 B2JP7854799 B2JP 7854799B2JP-7854799-B2

Inventors

長岡省吾
松岡馨
山本竜也
西山桂樹

Assignees

ＪＦＥ建材株式会社

Dates

Publication Date: 20260507
Application Date: 20211222

Claims (5)

A composite segment that is connected in multiple ways in the circumferential and axial directions of the earth retaining structure to construct the earth retaining structure, Steel shell and, The steel shell is filled with concrete, The aforementioned steel shell is A pair of main girders spaced apart in the axial direction, A skin plate joined to the outer periphery of the main girder, A pair of joint plates joined to both ends in the circumferential direction of the main girder, Within the steel shell, a pair of protruding plates extend circumferentially and protrude from each of the pair of main girders into the concrete, It has, Within the aforementioned concrete, The main reinforcement extending in the circumferential direction, The aforementioned axially extending force distribution reinforcement is provided, Arranged on the inner circumference side, the distribution reinforcement, or the inner reinforcement including the main reinforcement and the distribution reinforcement, Arranged on the outer periphery, the outer reinforcement includes the main reinforcement, or the main reinforcement and the distribution reinforcement, A connecting bar that connects the inner reinforcing bar and the outer reinforcing bar, It has, The pair of protruding plates are, They are arranged spaced apart from each other in the axial direction and are formed in a plate shape extending in the circumferential direction, Multiple through-holes are formed along the circumferential direction. It is provided between the inner reinforcement and the outer reinforcement in the radial direction of the earth retaining structure, It is in contact with the aforementioned inner reinforcement and is connected to the aforementioned inner reinforcement, The aforementioned internal reinforcement is, The inner reinforcement has connecting bars that connect the main reinforcement or distribution reinforcement that constitutes the inner reinforcement to the protruding plate, The aforementioned connecting reinforcement is, Both ends are bent, one end is hooked onto the main reinforcement or distribution reinforcement that constitutes the inner reinforcement, and the other end is inserted through the hole in the protruding plate. The pair of protruding plates are, A composite segment connected to the aforementioned connecting reinforcement.
The aforementioned steel shell is The composite segment according to claim 1, having a shape-retaining member joined between a pair of main girders.
The pair of protruding plates are, The composite segment according to claim 1 or 2, which is connected to the distribution reinforcement included in the inner reinforcement.
The distribution reinforcement that constitutes the inner reinforcement has bent ends. The composite segment according to claim 3 , wherein the tips of both ends of the force distribution muscle are inserted into the holes.
A retaining structure formed by combining a plurality of composite segments according to any one of claims 1 to 4 in the circumferential and axial directions.

Description

This invention relates to composite segments and earth-retaining structures used as earth-retaining structures for tunnels and the like. Conventionally, the Urban Ring Method (registered trademark) is known as a press-in method for constructing vertical underground structures. The Urban Ring Method involves assembling earth-retaining panels into a ring-shaped structure at the installation site, and then press-injecting the ring-shaped structure into the ground using a press-in device. After the ring-shaped structure is pressed into the ground, the inside of the ring-shaped structure is excavated and the soil removed, and a new ring-shaped structure is added on top. This process is repeated until a predetermined depth is reached, thereby constructing underground structures such as shafts. Another tunnel construction method is the shield tunneling method. The shield tunneling method involves using a tunneling machine installed in a shaft. After excavating a certain length, a segment ring is constructed at the rear of the machine. This ring is then assembled into a ring shape using, for example, arc-shaped composite segments. This ring is then sequentially extended to form a cylindrical lining, thus constructing the shield tunnel. The composite segments used in shafts or tunnels as described above are formed by filling a steel shell, which has a main girder forming the axial end face of the earth retaining structure, a joint plate forming the circumferential end face, and a skin plate forming the outer periphery, with a filler material such as concrete and allowing it to harden (see, for example, Patent Document 1). Japanese Patent Publication No. 2009-074291 This is a conceptual diagram of an earth retaining structure according to Embodiment 1.This is a conceptual diagram of the segment ring according to Embodiment 1, viewed in the direction AD of the hole axis.This is a perspective view of an example of a composite segment according to Embodiment 1, viewed from the inner circumference side.This is a perspective view of an example of a composite segment according to Embodiment 1, seen from the outer periphery.This is a perspective view showing an example of the internal structure of a synthetic segment according to Embodiment 1.This is a side view showing an example of the internal structure of a synthetic segment according to Embodiment 1.This is a schematic cross-sectional view showing an example of the internal structure of a synthetic segment according to Embodiment 1.This is a schematic cross-sectional view showing an example of the internal structure of a first modified example of the synthetic segment according to Embodiment 1.This is a perspective view showing an example of the internal structure of a synthetic segment according to Embodiment 2.This is a schematic cross-sectional view showing an example of the internal structure of a composite segment according to Embodiment 2.This is a schematic cross-sectional view showing an example of the internal structure of a first modified example of the composite segment according to Embodiment 2.This is a schematic cross-sectional view showing an example of the internal structure of a second modified example of the composite segment according to Embodiment 2.This is a schematic cross-sectional view showing an example of the internal structure of a third modified example of the composite segment according to Embodiment 2. The composite segment according to the embodiment will be described below with reference to the drawings. Note that in the following drawings, including Figure 1, the relative dimensions and shapes of the constituent members may differ from those of the actual components. Furthermore, in the following drawings, components with the same reference numerals are identical or equivalent, and this is consistent throughout the entire specification. In addition, terms indicating direction (e.g., up, down, left, right, front, back, front, and back) will be used as appropriate for ease of understanding; however, these notations are for explanatory convenience and do not limit the arrangement, direction, and orientation of the device, instrument, or component. Embodiment 1. [Earth retaining structure 200] Figure 1 is a conceptual diagram of an earth retaining structure 200 according to Embodiment 1. In Figure 1, the hole axis direction AD represents the axial direction of the earth retaining structure 200, the circumferential direction CD represents the circumferential direction of the earth retaining structure 200, and the radial direction RD represents the radial direction of the earth retaining structure 200, with the Y1 side representing the inner circumference of the earth retaining structure 200 and the Y2 side representing the outer circumference of the earth retaining structure 200. The earth retaining structure 200 is used as an earth retaining wall, for example, in the lining of a tunnel, and is installed on the wall surface of an excavation