JP4032391B2 - Shaft structure - Google Patents

Description

    The present invention relates to a shaft structure mainly used for a start shaft or a reaching shaft of a propulsion method.

    In the propulsion method, arc-shaped liner plates or arc-shaped and linear liner plates are connected in the circumferential and vertical directions to form a shaft inner wall, and a start shaft and a reaching shaft that are earthed by the shaft inner wall are constructed. Then, the excavator is excavated from the starting shaft to the reaching shaft, and a continuous tunnel is constructed between the starting shaft and the reaching shaft.

    This start shaft is used to carry in equipment such as shield excavators and building materials such as propulsion pipes, assembling and installing equipment, etc. Removal work is performed, and therefore it is necessary to secure a sufficient area for carrying-in assembly work, removal work, and the like in the start shaft and the reaching shaft.

    However, the size of the opening formed in the upper part of the shaft is often restricted in consideration of the road conditions (road width, etc.) at the construction site or the environment to neighboring houses.

    Therefore, the top of the shaft that opens to the ground is formed as small as possible, and the shaft main body that secures sufficient space for work is provided, with an inclined portion disposed obliquely between the top of the shaft and the shaft main body. A vertical shaft structure is provided (see, for example, Patent Document 1).

The inclined portion of the shaft structure is formed in a tapered cylindrical shape by connecting fan-shaped liner plates in the vertical and horizontal directions, and connects the shaft upper portion and the shaft main body portion having different diameters.
JP 2003-3782 A

    However, as described above, in the structure in which the inclined portion is formed in a tapered cylinder shape with a fan-shaped liner plate, the inclined portion may not withstand the earth pressure applied from above, and there is a risk of insufficient strength.

    In addition, since the inclined wall is overhanged, that is, the upper wall is overhanging, there is a problem that it is difficult to install the ladder and carry in / out the equipment. .

    In view of the above-described problems of the prior art, an object of the present invention is to provide a shaft structure in which an inclined portion has sufficient strength and a ladder or the like can be easily installed.

In order to solve the conventional problems as described above and achieve the intended object, the invention according to claim 1 is to provide an arc-shaped liner plate or an arc-shaped and linear liner plate in the circumferential direction and the vertical direction. In the shaft structure constructed by connecting and constructing the shaft inner wall and retaining the earth by the shaft inner wall,
The inner shaft of the shaft is configured with a shaft plate for the upper portion of the shaft, and the upper portion of the shaft having the same horizontal cross-sectional shape up and down ,
A vertical shaft main body configured with a main body liner plate having a larger radius of curvature and / or straight line length than the upper liner plate, and having the same horizontal cross-sectional shape up and down ,
It is interposed between the shaft upper part and the shaft main body part, and is composed of one or more stages of an inclined part liner in the form of a ring, and is inclined with different curvature radii and / or straight part lengths for each stage. An inclined portion formed in a stepped shape with the lower side sequentially enlarged using a portion liner plate, and decentered so that one side portion of the inclined portion liner of each step is positioned on a vertical straight line; With
The shaft upper part is arranged so as to be biased to one side in the horizontal direction of the shaft main body part, and one side part of the inclined part and the one side part of the shaft main part and one side part of the shaft main body part are located on a vertical straight line. It is in the configuration.

    In addition to the configuration of claim 1, the inclined portion liner plate is provided with step flanges on the inner edge of the upper end and the outer edge of the lower end, respectively, and the liner plate for the inclined portion having different curvature radii connected vertically. The step flange projecting from the outer edge of one lower end and the step flange projecting from the inner edge of the other upper end are overlapped and connected.

    In addition to the configuration of claim 2, the invention according to claim 3 is provided with a plurality of reinforcing plates in which the inclined portion liner plate is raised at a predetermined interval from a surface opposite to the joint surface of the step flange. A plate is provided.

    The shaft structure according to the present invention is configured such that an inner wall of a shaft is constructed by connecting arc-shaped liner plates or arc-shaped and linear liner plates in the circumferential direction and the vertical direction, and earthed by the shaft inner wall. In the shaft structure, the shaft inner wall includes a shaft upper portion configured with a liner plate for a shaft upper portion, and a shaft main body portion configured with a main body liner plate having a radius of curvature and / or a linear portion length larger than that of the upper liner plate. And an inclined portion that is interposed between the shaft upper portion and the shaft main body portion, and is formed in a step shape by using an inclined portion liner plate having a different curvature radius and / or linear portion length for each step or a plurality of steps. By providing, the intensity | strength of an inclination part improves and sufficient earth pressure proof stress can be obtained.

Further, the shaft upper portion, the inclined portion, and the shaft main body portion are arranged so as to be biased to one side in the horizontal direction, and the vertical work is continued in the same vertical plane across the shaft upper portion, the inclined portion, and the shaft main body portion . Equipped with an upright wall , that is, offset to one side in the horizontal direction of the vertical shaft main body, and one side of the inclined portion and the upper side of the vertical shaft and one side of the vertical shaft main body are on a vertical straight line Even if it is the structure which has an inclined part, the part which a wall surface does not overhang is obtained, and operations, such as installation of a ladder and carrying in / out of an equipment, can be performed suitably.

    The inclined portion liner plate is provided with step flanges at the upper inner edge and the lower outer edge, respectively, and the step flange projecting from one lower outer edge and the other upper inner edge of the inclined liner plate having different curvature radii connected vertically. By overlapping and connecting the stepped flanges, the strength of the inclined portion can be increased and the difference in outer radius between the liner plates for the vertically inclined portion formed by different curvature radii etc. The gap can be closed.

The inclined portion liner plate is provided with a plurality of reinforcing plates raised at a predetermined interval from the surface opposite to the joint surface of the step flange, thereby suitably increasing the strength of the inclined portion. it can.

    Next, the shaft structure according to the present invention will be described with reference to FIGS.

    1 and 2 are cross-sectional views schematically showing a shaft using the shaft structure according to the present invention.

    This shaft is excavated in the vertical direction, and a liner plate is connected to the inner surface of the excavation shaft 1 in the circumferential direction and sequentially connected in the downward direction. It is designed to keep the earth.

    As shown in FIGS. 3 and 4, the shaft inner wall 2 includes a shaft upper portion 3 opened to the ground, a shaft main body portion 4 having an outer shape larger than the shaft upper portion 3, and the shaft upper portion 3 and the shaft main body portion 4. It is comprised with the inclination part 5 which interposes and connects the shaft upper part 3 and shaft main-body part 4 from which an external shape differs.

Further, the shaft inner wall 2 is arranged with the shaft upper portion 3, the inclined portion 5 and the shaft main body portion 4 being biased to one side (the back side) in the horizontal direction, and straddling the shaft upper portion 3, the inclined portion 5 and the shaft main body portion 4. A work plane portion 6 that is continuous in a vertical plane is provided.

    The shaft upper part 3 is formed in a cylindrical shape with a small cross section having an outer shape as small as possible by connecting a plurality of types of liner plate 7, 7... For the shaft upper part in the circumferential direction and the vertical direction. It is formed to a position (position of 2 to 3 m deep from the ground surface).

    As the liner plate 7 for the shaft upper part, an arcuate one (C type), a straight one (straight type), and one in which an arcuate part and a straight part are integrally formed (J type) are used. In addition, each type (C type, straight type, J type) vertical shaft liner plates 7, 7,... Are combined and assembled in a staggered arrangement to form a cylinder.

    As shown in FIG. 5, the vertical shaft liner plate 7 includes a steel plate (corrugated plate) 8 having a corrugated cross section and an axially joined plate integrally attached to the upper and lower edges of the corrugated plate 8 by welding or the like. 9a and 9b, and circumferential joining plates 10a and 10b integrally attached to both circumferential edges of the corrugated plate 8 by welding or the like, and the circumferential joining plates 10a and 10b are both axial joining plates 9a and 9b. Axial joining plates 9 a and 9 b and circumferential joining plates 10 a and 10 b are formed in a frame shape surrounding the corrugated plate 8.

    The axial joining plates 9a and 9b are formed in a circular arc shape, a straight line shape, or a combined shape of a circular arc and a straight line (J shape) according to the shape of each die (C type, straight type, J type) with a flat plate. Has been.

    Further, a plurality of bolt insertion holes 11, 11... Are formed at predetermined intervals on the axial direction joining plates 9a, 9b, and the axial directions of the bolt insertion holes 11, 11 are aligned to face each other in the vertical direction. By joining the joining plates 9b and 9a, passing the bolts 12 through the bolt insertion holes 11 and tightening the bolts, the liner plates 7 and 7 for the upper shaft are joined in the vertical direction.

    The circumferential joining plates 10a and 10b are formed in a rectangular flat plate shape, and bolt insertion holes 13, 13... Are formed at predetermined intervals, and the circumferential joining plates of the adjacent vertical shaft upper liner plates 7 and 7 are formed. By aligning the positions of the bolt insertion holes 13 with 10a and 10b, passing the bolts 14 through the bolt insertion holes 13, and tightening the bolts, the liner plates 7 and 7 for the upper shaft are joined in the circumferential direction. Yes.

    The shaft main body 4 is formed in a cylindrical shape with an oval cross-section having a larger outer shape than the shaft upper portion 3 by connecting a plurality of types of liner main body liner plates 15, 15.

    The shaft body liner plate 15 includes an arcuate shape having a predetermined radius of curvature (C type), a linear shape having a predetermined linear length (straight type), and an arcuate portion and a straight portion. Are formed integrally (J type), and each type (C type, straight type, J type) shaft body liner plates 15, 15 ... are combined and assembled into a staggered arrangement. To be formed.

    The shaft body liner plate 15 is configured in substantially the same manner as the shaft upper liner plate 7 shown in FIG. 5, and has a radius of curvature and a linear portion length larger than that of the shaft upper liner plate 7. The formed steel plate (corrugated sheet) 8, the axial direction joining plates 9 a and 9 b that are integrally attached to the upper and lower edges of the corrugated sheet 8 by welding or the like, and the circumferential edges of the corrugated sheet 8 are respectively integrated by welding or the like. The circumferential joining plates 10a and 10b are attached to the end portions of the two axial joining plates 9a and 9b, and the axial joining plates 9a and 9b and the circumferential direction. The joining plates 10 a and 10 b are formed in a frame shape surrounding the corrugated plate 8.

    The inclined portion 5 is formed on the lower side by assembling the inclined portion liner plates 16, 16... Having different radii of curvature and straight line lengths for each step or a plurality of steps in ascending order of curvature radius and straight portion length. It is designed to be spread in steps.

    Further, the inclined portion 5 is arranged by inclining the inclined portion liners 17a to 17g formed by the inclined portion liner plates 16, 16,... The upper surface of the step is narrowly formed at both ends of the flat surface portion.

    The inclined portion liner plate 16 uses an arc-shaped one (C type), a straight one (straight type), and one in which an arc-shaped portion and a straight portion are integrally formed (J type), Annular inclined portion liners 17a to 17g are formed by combining the inclined portion liner plates 16, 16,... Of the respective types (C type, straight type, J type) in the circumferential direction.

    In addition, the curvature radius and linear part length of each liner 17a-17g for inclination parts differ for every step, and the curvature radius and linear part length of the liner 17a for inclination part of inclination part top stage are the curvature radius of the shaft upper part 3 In addition, the curvature radius and the straight portion length of the slope portion liner 17g at the bottom of the slope portion are formed to be the same as the curvature radius and the straight portion length of the shaft main body portion 4.

    As shown in FIG. 7, the inclined portion liner plate 16 includes a corrugated plate 18 made of a corrugated steel plate, and axial joining plates 19 a and 19 b attached integrally to the upper and lower edges of the corrugated plate 18 by welding or the like. The circumferential direction joining plates 20a and 20b are integrally attached to both end edges in the circumferential direction of the corrugated plate 18 by welding or the like, and the circumferential joining plates 20a and 20b are between the end portions of the two axial joining plates 19a and 19b. Axial joining plates 19 a and 19 b and circumferential joining plates 20 a and 20 b are formed in a frame shape surrounding the corrugated plate 18.

    The circumferential joining plates 20a, 20b are formed in a rectangular flat plate shape, and bolt insertion holes 21, 21,... Are formed at predetermined intervals, and the circumferential joining plates 20a of the adjacent inclined portion liner plates 16, 16 are formed. , 20b are aligned with the positions of the bolt insertion holes 21 and 21, and the bolts 22 are passed through the bolt insertion holes 21 and tightened so that the inclined portion liner plates 16 and 16 are joined in the circumferential direction. It has become.

    The axial joining plates 19a and 19b are formed in an arc shape, a straight shape, or a combination of an arc and a straight line according to the shape of each mold (C type, straight type, J type). Step flanges 23a and 23b are integrated with the inner edge of 19a and the outer edge of the lower axial joining plate 19b, respectively.

    That is, the inclined portion liner plate 16 is integrally provided with step flanges 23a and 23b that protrude from the upper end inner edge and the lower end outer edge.

    The step flanges 23 a and 23 b are formed in conformity with the shape of the upper surface of each step portion, and are not provided in the portion constituting the work plane portion 6. In addition, the overlapping portions of the step flanges 23a and 23b of the inclined portion liner plate 16 connected in the vertical direction are formed in the same shape.

    A plurality of bolt insertion holes 24, 24... Are formed at predetermined intervals in the circumferential direction on the inner edge of the axial joining plate 19a, the outer edge of the axial joining plate 19b, and the inner edge of the upper step flange 23a. A plurality of installation bolts 25, 25... Project downward from the outer edge of the lower step flange 23 b at a predetermined interval in the circumferential direction.

    The inclined portion liner plate 16 constituting the inclined portion liner 17a at the uppermost portion of the inclined portion having the same curvature radius and straight portion length as the shaft upper portion 3 is not provided with the upper step flange 23a. The position of the bolt insertion hole 11 of each upper liner plate 7 that constitutes the lowermost stage of this is aligned with the bolt insertion hole 24 formed in the axial direction bonding plate 19a of the inclined portion liner plate 16, and the axial direction bonding plate 9b, By aligning 19a and fastening with bolts, the vertical shaft upper liner plate 7 and the inclined portion liner plate 16 are joined in the vertical direction, and the vertical shaft upper portion 3 and the inclined portion 5 are connected.

    Similarly, the slope part liner plate 16 constituting the slope part liner 17g at the bottom part of the slope part having the same curvature radius and straight line length as the shaft main body part is not provided with the lower step flange 23b. The position of the bolt insertion hole 24 of each inclined portion liner plate 16 constituting the lowermost inclined portion liner 17g is set to the position of the bolt insertion hole 11 formed in the axial joining plate 9a of the main body liner plate 15. In addition, the axial joining plates 19b and 9a are abutted, and bolts are passed through the bolt insertion holes 11 and 24 and tightened, whereby the inclined portion liner plate 16 and the main body liner plate 15 are joined in the vertical direction. The part 5 and the shaft main body part 4 are connected.

    The surface opposite to the joint surface of the step flanges 23a and 23b is set up at a predetermined interval so as to be perpendicular to the outer peripheral surface or inner peripheral surface of the step flanges 23a and 23b and the liner plate 16. A plurality of reinforcing plates 26, 26... Are integrally formed, and the back surface portion of the reinforcing plate 26 is fixed to the top portion (valley portion) of the corrugated plate 18 by welding or the like.

    As shown in FIG. 8, the connecting portions of the inclined portion liners 17 a to 17 g having different curvature radii and linear portion lengths, that is, the structure of the stepped portion of the inclined portion 5, the positions of the installation bolts 25, 25. , 24... And the positions of the bolt insertion holes 24, 24 are matched, the stepped flanges 23 a, 23 b are abutted and joined by bolting. In the figure, reference numeral 27 denotes a bolt for connecting the axial joining plates.

    At this time, by fixing the installation bolt 25 downwardly and projectingly to the lower step flange 23b of the inclined portion liner plates 16, 16, the bolt can be tightened from the inside of the shaft, and easily Tightening work can be performed.

    In addition, the gaps formed in the upper surface of the stepped portion formed by the inclined portion liners 17a to 17g having different radii of curvature and straight line lengths for each step are steps formed in accordance with the shape of the upper surface of the stepped portion. It is closed by the flanges 23a and 23b.

    In the above-described embodiment, the example in which the shaft structure according to the present invention is applied to a cross-section type shaft has been described, but the present invention can also be applied to a shaft having a circular cross section and other types of shafts.

It is sectional drawing which shows the outline of the shaft using the shaft structure which concerns on this invention. It is an AA line sectional view same as the above. It is a top view which shows the outline | summary of the shaft inner wall in FIG. It is a front view same as the above. (A) is a top view which shows an example of a liner upper part (for main-body part) liner plate, (b) is the same front view, (c) is the BB sectional drawing. It is sectional drawing which shows the joining state between liner plates. (A) is a top view which shows an example of the liner plate for inclination parts, (b) is the same front view, (c) is the CC sectional view taken on the line. It is a partial expanded sectional view which shows the level | step-difference part of the inclination part in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Excavation shaft 2 Vertical shaft inner wall 3 Vertical shaft upper part 4 Vertical shaft main part 5 Inclined part 6 Work plane part 7 Vertical shaft liner plate 8 Corrugated sheet 9 Axial joining plate 10 Circumferential joining plate 11 Bolt insertion hole 12 Bolt 13 Bolt insertion hole 14 Bolt 15 Body liner plate 16 Inclined portion liner plate 17 Inclined portion liner 18 Corrugated plate 19 Axial joining plate 20 Circumferential joining plate 21 Bolt insertion hole 22 Bolt 23 Step flange 24 Bolt insertion hole 25 Installation bolt 26 Reinforcing plate 27 bolt

Claims (3)

In the shaft structure constructed by connecting the arc-shaped liner plate or the arc-shaped and linear liner plates in the circumferential direction and the vertical direction to construct the shaft inner wall, and retaining the earth by the shaft inner wall,
The inner shaft of the shaft is configured with a shaft plate for the upper portion of the shaft, and the upper portion of the shaft having the same horizontal cross-sectional shape up and down ,
A vertical shaft main body configured with a main body liner plate having a larger radius of curvature and / or straight line length than the upper liner plate, and having the same horizontal cross-sectional shape up and down ,
It is interposed between the shaft upper part and the shaft main body part, and is composed of one or more stages of an inclined part liner in the form of a ring, and is inclined with different curvature radii and / or straight part lengths for each stage. An inclined portion formed in a stepped shape with the lower side sequentially enlarged using a portion liner plate, and decentered so that one side portion of the inclined portion liner of each step is positioned on a vertical straight line; With
The shaft upper part is arranged so as to be biased to one side in the horizontal direction of the shaft main body part, and one side part of the inclined part and the one side part of the shaft main part and one side part of the shaft main body part are located on a vertical straight line. A vertical shaft structure characterized by the above structure.     The inclined portion liner plate is provided with step flanges at the upper inner edge and lower outer edge, respectively, and the step flange projecting from one lower outer edge and the other upper inner edge of the inclined liner plate having different curvature radii connected vertically. The shaft structure according to claim 1, wherein the stepped flange is overlapped and joined.     3. The shaft structure according to claim 2, wherein the inclined portion liner plate includes a plurality of reinforcing plates raised at a predetermined interval from a surface opposite to the joint surface of the step flange.

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