JP-7856517-B2 - Shaft construction apparatus and shaft construction method

Inventors

• 森山 智明
• 鈴木 健
• 藤本 雄充
• 大野 啓介
• 山本 剛史
• 竹田 茂嗣
• 岩瀬 隆
• 湊 憲二
• 磯上 武章
• 磯上 章太
• 大高 範寛

Assignees

• 東日本旅客鉄道株式会社
• 鉄建建設株式会社
• 株式会社忠武建基
• 日鉄建材株式会社

Dates

Publication Date

20260511

Application Date

20220726

Claims (9)

1. A shaft construction device that constructs a shaft underground by assembling annular liner plates in the vertical direction, A cylindrical cutting edge extending downwards, having an inner dimension larger than the outer dimension of the liner plate, A drilling section for drilling the bottom of the hole inside the cutting edge, An extension/retraction mechanism that uses the existing assembled liner plate as a reaction force to press the cutting edge downward, A shaft construction device comprising an inner cylindrical portion, which is positioned inside the cutting edge and has an inner dimension larger than the outer dimension of the liner plate, and is fixed to the telescopic mechanism so as to be movable relative to the cutting edge.
2. The telescopic mechanism comprises a telescopic main body that extends and retracts in the height direction, and a contact portion provided at the tip of the telescopic main body that abuts against the lower end of the assembled liner plate. The aforementioned retractable body is fixed to the blade opening, The shaft construction apparatus according to claim 1, wherein the inner cylindrical portion is fixed to the contact portion.
3. The shaft construction apparatus according to claim 1, wherein the outer circumferential surface of the inner cylindrical portion is configured to face at least the upper part of the inner circumferential surface of the cutting edge.
4. The shaft construction device according to claim 1, wherein the upper end of the inner cylindrical portion abuts against or is close to the backfill material filled between the outer surface of the assembled liner plate one level above the lowest level and the hole wall.
5. The shaft construction apparatus according to claim 1, wherein the length in the height direction of the inner cylindrical portion is longer than the length in the height direction of one of the liner plates.
6. The shaft construction apparatus according to claim 1, wherein a plurality of the extension and retraction mechanisms are provided at predetermined intervals in the circumferential direction of the cutting edge.
7. The shaft construction apparatus according to claim 1, wherein a work platform supported by the cutting edge is provided below the inner cylindrical portion.
8. The shaft construction device according to claim 1, wherein a blocking member is detachably provided to block the space between the lower end of the existing assembled liner plate and the hole wall.
9. A method for constructing a shaft underground by assembling annular liner plates in the vertical direction, The drilling process involves a drilling section excavating the bottom of a hole inside a cylindrical cutting edge that extends downward and has an internal dimension larger than the external dimension of the liner plate, An extension process in which the extension mechanism uses the existing assembled liner plate as a reaction force to press the cutting edge downwards and lower the cutting edge, With the cutting edge lowered by at least one step of the liner plate, the assembly process of attaching the liner plate to the lower end of the lowest assembled liner plate is repeated. In the extension process, A method for constructing a shaft, wherein an inner cylindrical portion, which is positioned inside the cutting edge and has an inner dimension larger than the outer dimension of the liner plate, is fixed to the telescopic mechanism so as to be movable relative to the cutting edge, and protrudes upward from the upper end of the cutting edge as the cutting edge descends.

Description

This invention relates to a shaft construction device and a shaft construction method for constructing a shaft by assembling annular liner plates in the ground in the vertical direction. For example, there is the deep foundation method, which involves constructing a shaft by assembling ring-shaped liner plates vertically underground. Specifically, this method involves excavating the bottom of a hole and protecting the excavated hole wall with an annular liner plate, repeating this process until a predetermined depth is reached to construct a shaft. The method described in Patent Document 1 is one such method. In this Patent Document 1, the drilling device for excavating the bottom of the hole is positioned below an annular liner plate assembled in the height direction, and the support reaction force for the drilling device is secured by pressing the support device that supports the drilling device against the hole wall. Furthermore, in Patent Document 1, once the excavation to the depth corresponding to one ring is completed, a work platform positioned above the excavation device is lowered by a support device, and a worker on the work platform assembles a new liner plate onto the lowest liner plate. This process is repeated until a predetermined depth is reached, thereby constructing a shaft of that predetermined depth. By the way, in deep foundation construction, if excavation of the borehole bottom is obstructed by obstacles such as rocks, it is necessary to interrupt the excavation and remove the obstacles. In this case, interrupting the excavation of the borehole bottom may result in a portion of the excavated borehole wall not being protected by the liner plate. For example, in the case of Patent Document 1, if excavation of the borehole bottom is interrupted to remove an obstruction, the borehole wall will be exposed between the existing assembled liner plate and the support device, and the obstruction at the borehole bottom will be removed in this state. In this case, according to Patent Document 1, there was a risk that soil and sand would flow into the borehole if the borehole wall collapsed due to unintended vibrations or other factors. Japanese Patent Application Publication No. 9-165990 A schematic cross-sectional perspective view of a mechanical deep foundation construction method.A schematic cross-sectional view of the mechanical deep foundation construction method in the direction of arrow A-A in Figure 1.A bottom view showing the bottom of the excavation unit.An explanatory diagram showing an enlarged cross-sectional view of the backfill area.A schematic diagram showing the configuration of the control unit.A flowchart illustrating the process of the mechanical deep foundation construction method.A flowchart illustrating the process of the mechanical deep foundation construction method.An explanatory diagram showing a schematic cross-section of the mechanical deep foundation construction method.An explanatory diagram showing a schematic cross-section of the mechanical deep foundation construction method.An explanatory diagram showing a schematic cross-section of the mechanical deep foundation construction method.An explanatory diagram showing a schematic cross-section of the mechanical deep foundation construction method.An explanatory diagram showing a schematic cross-section of the mechanical deep foundation construction method.An explanatory diagram showing a schematic cross-section of the mechanical deep foundation construction method. One embodiment of a mechanical deep foundation construction method using an excavation unit 50 will be described below with reference to the drawings. Figure 1 shows a schematic cross-sectional perspective view of the mechanical deep foundation construction method, Figure 2 shows a schematic cross-sectional view of the mechanical deep foundation construction method, Figure 3 shows a bottom view of the excavation unit 50, Figure 4 shows an explanatory diagram of an enlarged cross-sectional view of the backfill area, and Figure 5 shows a schematic configuration diagram of the control unit 60. Furthermore, Figure 4(a) shows an enlarged cross-sectional view of the state in which the blocking member 58 is attached to the lowest ring 20A, and Figure 4(b) shows an enlarged cross-sectional view of the state in which the backfill material 30 is filled between the lowest ring 20A and the hole wall 11a. Furthermore, the upper part of Figure 1 is considered to be above the excavation unit 50, and the lower part of Figure 1 is considered to be below the excavation unit 50. Furthermore, in Figure 1, for clarity, the front side of the liner plate 20 is shown in a transparent state, and the backfill material 30 is omitted from the illustration. Additionally, in Figure 1, the front side of the cutting edge 51 and inner cylindrical section 57 of the excavation unit 50 are shown in a transparent state, and the work platform 54 is shown with a dashed line. First, as shown in