JP-7854907-B2 - Earth retaining panels, earth retaining structures, and construction methods for earth retaining structures

JP7854907B2JP 7854907 B2JP7854907 B2JP 7854907B2JP-7854907-B2

Inventors

松岡馨
原翔悟
若山崇大

Assignees

ＪＦＥ建材株式会社

Dates

Publication Date: 20260507
Application Date: 20220916

Claims (9)

A retaining wall panel used to construct a retaining wall structure in an excavated hole formed by excavating the ground, A skin plate facing the wall surface of the aforementioned borehole, A pair of flat main girders are provided at one of the opposing ends of the skin plate, A pair of joint plates provided at the other opposing end of the skin plate, A retaining wall panel comprising: a skin plate, a main girder, and a joint plate, the skin plate, a vertical beam provided inside the enclosure, and having a plane to which bracing can be joined; and a vertical beam having a plane to which bracing can be joined.
The earth retaining panel according to claim 1, further comprising a shape-retaining member provided between a pair of main girders to maintain the shape of the main girders.
The earth retaining panel according to claim 1 or 2, further comprising a main girder reinforcing member provided between the main girder and the longitudinal beam to reinforce the main girder.
The earth retaining panel according to claim 1 or 2, wherein the vertical beam has a web and a first flange provided at one end of the web, to which the bracing can be joined.
The earth retaining panel according to claim 4, wherein the longitudinal beam further comprises a second flange provided at the other end of the web and positioned opposite the skin plate.
A retaining wall structure constructed by installing retaining wall panels in an excavated hole formed by excavating the ground, A structure formed by arranging a plurality of earth-retaining panels in a ring along the wall surface of the excavation hole comprises a first earth-retaining structure constructed in at least one stage in the direction of the hole axis, The earth retaining panel comprises a skin plate facing the wall surface of the excavation hole, a pair of main girders provided at one opposing end of the skin plate, and a pair of joint plates provided at the other opposing end of the skin plate. Of the multiple earth retaining panels, at least some of the earth retaining panels have longitudinal beams that are provided inside the area enclosed by the skin plate, the main girder, and the joint plate, and have a plane to which bracing can be joined. The aforementioned vertical beams are arranged facing each other in the circumferential direction of the excavation hole, and the opposing vertical beams are connected to each other by the bracing, forming an earth retaining structure.
The structure formed by arranging a plurality of corrugated steel plates in a ring along the wall surface of the aforementioned borehole further comprises a second earth retaining structure constructed in at least one stage in the direction of the borehole axis. The retaining wall structure according to claim 6, wherein the first retaining wall structure is constructed below the second retaining wall structure.
The corrugated steel plate is configured such that its corrugated cross-section is sine-curve-shaped, or bent to form a corrugated shape, according to claim 7, for the earth-retaining structure.
A method for constructing an earth retaining structure as described in any one of claims 6 to 8, When arranging a plurality of earth retaining panels sequentially along the wall surface of the excavation hole, the plurality of earth retaining panels are arranged and joined such that the vertical beams are continuous along the hole axis direction of the excavation hole and the vertical beams face each other in the circumferential direction of the excavation hole. A method for constructing an earth retaining structure, wherein the longitudinal beams facing each other in the circumferential direction of the excavated hole are connected by the bracing.

Description

This invention relates to earth-retaining panels, earth-retaining structures, and methods for constructing earth-retaining structures. Conventionally, as disclosed in, for example, Patent Document 1, earth retention structures are known that are constructed by assembling corrugated steel plates in vertical boreholes formed by excavating the ground. These earth retention structures are constructed by stacking structures formed by arranging multiple corrugated steel plates in a ring shape along the wall surface of the borehole in the direction of the borehole axis. As the depth of the excavation hole increases, the earth pressure from the surrounding ground increases, and corrugated steel plates alone may not provide sufficient rigidity. Furthermore, regardless of depth, the earth pressure may be high depending on soil conditions. Additionally, as the depth increases in the axial direction of the hole, the weight of the upper annular structure acts on the lower annular structure. Therefore, in earth retaining structures, at deeper depths, H-shaped steel reinforcement rings are inserted between adjacent corrugated steel plates to increase rigidity. Furthermore, in earth-retaining structures, there is a risk of the corrugated steel plates bending due to the earth pressure in the excavation hole. Therefore, vertical beams extending in the direction of the hole axis are placed at intervals along the circumferential direction of the excavation hole on the inner side of the corrugated steel plates, and opposing vertical beams are connected with bracing to increase the strength against earth pressure. Japanese Patent Publication No. 2020-066845 This is a schematic front view showing an earth retaining structure according to an embodiment.This is a plan view showing the first earth retaining structure of an earth retaining structure according to an embodiment.This is a plan view showing the second earth retaining structure of the earth retaining structure according to the embodiment.This is a perspective view showing an example of a retaining wall panel used in a retaining wall structure according to an embodiment.Figures (A) to (D) are plan views showing various shapes of earth retaining panels used in the earth retaining structure according to the embodiment.This is a perspective view showing a retaining wall panel according to an embodiment.(A) to (D) are explanatory diagrams showing earth-retaining panels according to the embodiment.This is a schematic explanatory diagram showing the state in which the earth retaining panel according to the embodiment is arranged in the axial direction of the excavation hole.This is a schematic explanatory diagram showing the state in which bracing is installed in the first earth retaining structure of the earth retaining structure according to the embodiment.(A) and (B) are explanatory diagrams showing an example of corrugated steel plate used in an earth retaining structure according to the embodiment.This is a cross-sectional view enlarged from the line XI-XI shown in Figure 10(A).This is an enlarged view of section XII in Figure 1.This is a schematic explanatory diagram showing the state in which longitudinal beams and bracing are installed in the second earth retaining structure of the earth retaining structure according to the embodiment.This is a cross-sectional view showing different forms of corrugated steel sheet according to the embodiment.This is a schematic explanatory diagram showing an example of a construction method for an earth retaining structure according to an embodiment. The embodiments of the present invention will be described below with reference to the drawings. In each drawing, identical or corresponding parts are denoted by the same reference numerals, and their descriptions are omitted or simplified as appropriate. Furthermore, the shape, size, and arrangement of the components shown in each drawing can be modified as appropriate within the scope of the present invention. In addition, terms indicating direction (e.g., up, down, left, and right) are used as appropriate to facilitate understanding, but these notations are for explanatory convenience and do not limit the arrangement, direction, and orientation of the devices, instruments, or parts. Embodiment. Figure 1 is a schematic front view showing the earth retaining structure 100 according to the embodiment. Figure 2 is a plan view showing the first earth retaining structure 101 of the earth retaining structure 100 according to the embodiment. Figure 3 is a plan view showing the second earth retaining structure 102 of the earth retaining structure 100 according to the embodiment. As shown in Figures 1 to 3, the earth retaining structure 100 according to this embodiment is a vertical shaft constructed in a rectangular shape in plan view by installing earth retaining panels 1 and 2 and corrugated steel plates 4 in a vertical excavation hole 300 formed by excavating the ground. Specifically, the earth