JP2021139113A - Hexagonal segment manufacturing formwork - Google Patents

Abstract

To provide a hexagonal segment manufacturing formwork capable of continuing to form a high-quality hexagonal segment by accurately retracting an end plate portion when removing the mold even when used repeatedly many times.SOLUTION: A pair of end plate portions 14 are respectively disposed so as to advance and retract in a direction approaching and separating from each other via an end plate advancing and retracting mechanism 20 supported and provided by a base portion 30. The end plate advancing and retracting mechanism 20 includes: a retracting guide portion 23 including a slide guide shaft 21 provided by linearly extending in the advancing and retracting direction of the end plate portion 14 in a state where one end portion is fixed to a bottom plate portion 11 and another end portion is fixed to the base portion 30, and a bearing 22 provided so as to slide-move along the slide guide 21 in a state fixed to the end plate portion 14; and an advancing and retracting operation portion 25 that advances and retracts the pair of the end plate portions 14.SELECTED DRAWING: Figure 6

Description

The present invention relates to a form for manufacturing a hexagonal segment, and in particular, for forming a hexagonal segment having a face side axial joint surface and a wellhead side axial joint surface and a pair of V-shaped circumferential joint surfaces. Regarding formwork for manufacturing hexagonal segments.

As a method of constructing various tunnels in urban areas and plains, a shield method using a shield excavator is widely adopted. In the shield method, the face of the tip of the shield excavator is pressed by mud, muddy water, pressure, etc. while excavating the ground with a cutter, and the tunnel is connected behind the shield excavator in the axial and circumferential directions. By sequentially assembling the segments, a lining body covering the inner peripheral surface of the tunnel is formed, and the shield jack is pressed against the front end of the assembled lining body to obtain a reaction force and reach from the starting shaft. It is a construction method in which a tunnel is constructed underground toward the shaft.

In recent years, from the viewpoint of improving the efficiency of construction, the segment constituting the lining body covering the inner peripheral surface of the tunnel is provided with a hexagonal planar shape instead of the commonly used segment having a rectangular planar shape. A shield tunneling method using hexagonal segments may be adopted (see, for example, Patent Document 1 and Patent Document 2). The hexagonal segments are arranged in a V shape so as to connect the axial joint surfaces on the face side and the axial joint surfaces on the wellhead side arranged in parallel and the ends on both sides of these axial joint surfaces. It is provided with a pair of V-shaped circumferential joint surfaces including an oblique joint surface on the face side and an oblique joint surface on the wellhead side (see FIG. 1). The hexagonal segment is a hexagon that is attached to the face-side axial joint surface and the face-side diagonal joint surface of the hexagonal segment that is assembled prior to the rear side of the tunnel in the excavation direction, and subsequently to the front side of the tunnel in the excavation direction. While superimposing the wellhead side axial joint surface and the wellhead side diagonal joint surface of the segments, the equileg trapezoidal part, which is the half part of the front side of the tunnel in the excavation direction, is alternately projected in each hexagonal segment. However, they are arranged in a honeycomb shape in the axial direction and the circumferential direction of the tunnel and are sequentially assembled (see, for example, Patent Documents 3 and 4).

In the shield method using hexagonal segments, the shield jack is pressed against the axial joint surface on the face side of the equilateral pedestal-shaped part that protrudes alternately in the hexagonal segments, and the shield excavator is dug while taking the reaction force. At the same time, in parallel with this, the work of assembling the subsequent hexagonal segment can be performed in the region between the adjacent equilateral trapezoidal portions to which the shield jack is pressed (for example, Patent Document 3, FIG. (Refer to 4), as in the shield method using a segment having a rectangular flat shape, the hexagonal segment is assembled without interrupting the process of digging the shield excavator for each ring and assembling the segment. However, by continuously excavating the shield excavator, it becomes possible to efficiently carry out the shield construction.

Furthermore, in the shield method using hexagonal segments, the connection between adjacent hexagonal segments is performed by the axial joint surface on the face side, the axial joint surface on the wellhead side, the diagonal joint surface on the face side, and the diagonal joint on the wellhead side. A segment having a rectangular planar shape because it is carried out using connecting bolts that are attached through the joint surfaces of the surfaces (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). It is possible to prevent unevenness due to a bolt box or the like for fastening connecting bolts, which appears on the inner peripheral surface of the lining body due to the hexagonal segment, from being formed on the inner peripheral surface of the lining body due to the hexagonal segment. become. Further, since this makes it possible to keep the inner peripheral surface of the lining body in a smooth state, it is preferable to further perform a secondary lining inside the lining body made of hexagonal segments having an anticorrosion layer on the inner side surface. There is no need to construct, and the inner peripheral surface of the lining body made of hexagonal segments is used as it is as the inner peripheral surface of the tunnel. It will be possible to effectively utilize it as a tunnel for a reservoir for storage.

Such hexagonal segments are preferably concrete segments formed using a patent, and in particular, a face-side axial joint surface, a wellhead-side axial joint surface, and a pair of V-shapes that are joined to each other. Since it is necessary to form the joint surface in the circumferential direction with high accuracy, a mold for manufacturing a hexagonal segment for this purpose has been developed (see, for example, Patent Document 4).

The hexagonal segment manufacturing formwork described in Patent Document 4 has a bottom plate portion and a pair of side plates forming both side portions of the hexagonal segment, which are erected so as to form a concrete placing space on the bottom plate portion. It is provided with a portion and a pair of end plate portions forming both ends of the hexagonal segment, and the pair of end plate portions includes an end plate slide shaft, a slide roller pin, a lower plate, a guide rail, a pedestal, and a guide roller. It is provided so as to be movable in a direction away from each of the formed hexagonal segments by an opening / closing means including an opening / closing bolt or the like.

That is, the end plate portion is formed on the lower plate along the guide roller attached to the pedestal by rotating the opening / closing bolt while the moving direction is guided by the end plate slide shaft and the advancing / retreating guide portion by the slide roller pin. By sliding the guide rail provided on the lower surface, the lower plate can be moved with respect to the pedestal and retracted in a direction away from the hexagonal segment (see FIG. 5). This prevents cracks and chips from occurring in the hexagonal segment during demolding, especially at the joint angle portion between the bottom plate portion and the end plate portion.

Japanese Patent No. 2596666 Japanese Unexamined Patent Publication No. 9-273395 Japanese Patent No. 3253870 Japanese Patent No. 3481769

However, in the conventional hexagonal segment manufacturing form described above, the advancing / retreating guide portion that guides the moving direction of the end plate portion is the lower portion of the end plate portion 50 in the region below the bottom plate 52a, as shown in FIG. The overhanging portion 51a of the srad shaft 51 fixed to the bottom plate 52a toward the bottom plate 52a is arranged so as to be sandwiched between the upper and lower slide roller pins 53a and 53b supported by the support bracket 52b of the bottom plate portion 52. The overhanging portion 51a of the sandwiched srad shaft 51 slides between the upper and lower slide roller pins 53a and 53b so that the advancing / retreating direction of the end plate portion 50 can be guided. Therefore, when the hexagonal segment manufacturing formwork is repeatedly used, the overhanging portion 51a of the srad shaft 51 overhangs in a cantilever shape with a considerable length, which causes eccentricity or eccentric load due to fatigue. The slide roller pins 53a and 53b, which are slidably moved, are likely to be laterally shaken (serpentine) or rattled, whereby the end plate portion 50 is accurately retracted and formed in a predetermined direction. It may be difficult to keep a stable distance from the hexagonal segment.

Further, particularly in recent years, it has been requested to construct a large shield tunnel having a large inner diameter using a hexagonal segment, and the area and thickness of each hexagonal segment tend to increase, and the hexagonal segment used is used. The number of square segments has also become enormous, and the number of times the hexagonal segment manufacturing mold has been used repeatedly has also increased. For this reason, even when the hexagonal segment manufacturing formwork is repeatedly used many times, the end plate portion is accurately retracted in a predetermined direction at the time of demolding in a more stable state, and the quality is good. It is desired to develop a technique that enables the formation of hexagonal segments.

The present invention continues to form a good quality hexagonal segment by allowing the end plate to be retracted in a predetermined direction with high accuracy and in a more stable state even when used many times repeatedly. It is an object of the present invention to provide a formwork for manufacturing a hexagonal segment that can be used.

In the present invention, the face side oblique joint surface and the wellhead side axial joint surface are arranged in a V shape so as to connect the end portions on both sides of the pair of axial joint surfaces. In the hexagonal segment manufacturing mold for forming a hexagonal segment having a pair of V-shaped circumferential joint surfaces composed of a joint surface and an oblique joint surface on the wellhead side by pouring concrete and hardening the six. A bottom plate portion having a curved shape portion along the inner peripheral surface of the square segment, and a curved shape portion along the face side axial joint surface arranged upright on both side edge portions of the bottom plate portion. The V. It is configured to include a pair of end plate portions having a V-shaped portion along a joint surface in the circumferential direction, and a base portion that integrally supports the bottom plate portion, the side plate portion, and the end plate portion from below. The face side plate portion and the wellhead side plate portion are arranged so as to be able to advance and retreat in directions approaching and separating from each other via a side plate advancing / retreating mechanism provided supported by the base portion. The pair of end plate portions are arranged so as to be able to advance and retreat in the directions of approaching and separating from the bottom plate portion via an end plate advancing / retreating mechanism provided supported by the base portion. The end plate advancing / retreating mechanism is provided so as to extend linearly in the advancing / retreating direction of the end plate portion in a state where one end is fixed to the bottom plate portion and the other end is fixed to the base portion. An advance / retreat operation consisting of a slide guide shaft and a bearing provided so as to be slidable along the slide guide shaft while being fixed to the end plate portion, and an advance / retreat operation for advancing / retreating the pair of end plate portions. The above object is achieved by providing a mold for manufacturing a hexagonal segment, which is composed of a part and the like.

In the hexagonal segment manufacturing formwork of the present invention, the advancing / retreating operation portion of the end plate advancing / retreating mechanism is provided in a lower portion of the top of the V-shaped portion in the end plate portion, and the end plate is provided. The advance / retreat guide portions of the advance / retreat mechanism are arranged symmetrically on both sides of the advance / retreat operation portion, and are provided at lower portions of the hypotenuse portions on both sides of the V-shaped portion in the end plate portion. Is preferable.

Further, in the hexagonal segment manufacturing formwork of the present invention, the slide guide shaft of the advancing / retreating guide portion is a cylindrical or cylindrical shaft member, and the bearing is a cylindrical rolling bearing. It is preferable to have.

According to the hexagonal segment manufacturing mold of the present invention, even when the mold is used repeatedly many times, the end plate portion can be retracted in a predetermined direction with high accuracy and in a more stable state at the time of demolding, so that the quality can be improved. Can continue to form good hexagonal segments.

It is a top view of the hexagonal segment manufacturing formwork which concerns on one preferred embodiment of this invention. FIG. 1 is a side view of the hexagonal segment manufacturing formwork according to a preferred embodiment of the present invention as viewed from the X direction. FIG. 1 is an end view of a hexagonal segment manufacturing formwork according to a preferred embodiment of the present invention as viewed from the Y direction. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 3 for explaining the configuration of the end plate advancing / retreating mechanism. It is sectional drawing along BB of FIG. 4 explaining the structure of the advancing / retreating operation part of the end plate advancing / retreating mechanism. FIG. 5 is a cross-sectional view taken along the line CC of FIG. 4 for explaining the configuration of the advancing / retreating guide portion of the end plate advancing / retreating mechanism. The configuration of the hexagonal segment formed by using the hexagonal segment manufacturing formwork according to the preferred embodiment of the present invention will be described. FIG. (C) is a side view of (a) viewed from the E direction, and (d) is a circumferential end view of (a) viewed from the F direction. It is sectional drawing explaining the structure of the advance / retreat guide part of the conventional end plate advance / retreat mechanism.

The hexagonal segment manufacturing formwork 10 according to a preferred embodiment of the present invention shown in FIGS. 1 to 3 has a plurality of hexagonal segments as hexagonal segments 40 (see FIGS. 7A to 7D). By connecting 40 in the axial direction (digging direction) and the circumferential direction of the tunnel and assembling them in a honeycomb shape, a lining body covering the inner peripheral surface of the shield tunnel for a reservoir for temporarily storing rainwater is preferably configured. It is used as a formwork for forming hexagonal segments made of concrete. The shield tunnel for the reservoir is, for example, a large circular tunnel having an inner diameter of about 5000 mm, and the individual hexagonal segments 40 forming the lining covering the inner peripheral surface of the tunnel are also in the tunnel axial direction. The width of the tunnel is about 1000 mm, the length in the circumferential direction of the tunnel is about 3000 mm, and the thickness is about 300 mm, which is a large size, and a large number of hexagonal segments 40 are used. The hexagonal segment manufacturing formwork 10 of the present embodiment accurately stabilizes a hexagonal segment having good quality even when it is repeatedly used many times to form such a large number of hexagonal segments 40. It has a function that enables it to continue to form in the state of being formed.

The hexagonal segment manufacturing formwork 10 of the present embodiment has the face side axial joint surface 41 and the wellhead side axial joint surface 42, and the end portions on both sides of the pair of the axial joint surfaces 41 and 42. A hexagonal segment 40 ((FIG. 7)) including a pair of V-shaped circumferential joint surfaces 45 including a face side diagonal joint surface 43 and a wellhead side diagonal joint surface 44, which are arranged in a V shape so as to be connected to each other. (See (a) to (d))) is a formwork for manufacturing a segment for forming by pouring concrete and hardening it, and as shown in FIGS. 1 to 3, among the hexagonal segments 40. Along the face side axial joint surface 41 of the hexagonal segment 40, which is arranged upright on the side edge portions on both sides of the bottom plate portion 11 having a curved shape portion 11a along the peripheral surface and the bottom plate portion 11, respectively. The face side plate portion 12 having the curved shape portion 12a, the wellhead side side plate portion 13 having the curved shape portion 13a along the wellhead side axial joint surface 42, and the bottom plate portion 11 are erected on both side edge portions, respectively. A pair of end plate portions 14 having a V-shaped portion 14a along a V-shaped circumferential joint surface 45, and these bottom plate portions 11, side plate portions 12, 13 and end plate portions 14 are arranged downward. It is configured to include a base portion 30 that is integrally supported from the above. The face side plate portion 12 and the wellhead side plate portion 13 can advance and retreat in the directions of approaching and separating from each other via the side plate advancing / retreating mechanism 32 provided supported by the base portion 30 (see FIGS. 2 and 3). As shown in FIGS. 4 to 6, the pair of end plate portions 14 are arranged with respect to the bottom plate portion 11 via the end plate advancing / retreating mechanism 20 provided supported by the base portion 30. They are arranged so that they can move forward and backward in the directions of approaching and separating. The end plate advancing / retreating mechanism 20 is provided so as to extend linearly in the advancing / retreating direction of the end plate portion 14 in a state where one end is fixed to the bottom plate 11 and the other end is fixed to the base 30. A pair of an advance / retreat guide portion 23 (see FIG. 6) including a slide guide shaft 21 and a bearing 22 provided so as to be slidable along the slide guide shaft 21 while being fixed to the end plate portion 14. It is configured to include an advancing / retreating operation unit 25 (see FIG. 5) for advancing / retreating the end plate portion 14.

Further, in the present embodiment, the slide guide shaft 21 of the advance / retreat guide portion 23 is preferably a cylindrical or cylindrical shaft member, and the bearing 22 is preferably a cylindrical rolling bearing (FIG. 6). 6).

In the present embodiment, the hexagonal segment 40 formed by using the hexagonal segment manufacturing formwork 10 has face-side axial joint surfaces arranged in parallel as shown in FIGS. 7 (a) to 7 (d). The diagonal joint surface 43 on the face side and the diagonal joint surface on the wellhead side are arranged in a V shape so as to connect the 41 and the axial joint surface 42 on the wellhead side and the ends on both sides of these axial joint surfaces 41 and 42, respectively. It is a segment made of reinforced concrete having a hexagonal planar shape and having a pair of V-shaped circumferential joint surfaces 45 composed of joint surfaces 44. The hexagonal segment 40 has a shape in which the cross section in the direction along the face side axial joint surface 41 and the wellhead side axial joint surface 42 is curved in an arc shape (see FIGS. 7 (b) and 7 (c)). ). In the hexagonal segment 40, the angle θ between the face side diagonal joint surface 43 and the wellhead side diagonal joint surface 44 on each V-shaped circumferential joint surface 45 is 120 ° (FIG. 7 (a)). )reference). As a result, the plurality of hexagonal segments 40 are placed at the wellheads of the hexagonal segments 40 that are subsequently installed on the face side diagonal joint surface 43 and the face side axial joint surface 41 of the hexagonal segment 40 that are installed in advance. The side diagonal joint surface 44 and the wellhead side axial joint surface 42 can be arranged in a honeycomb shape in the axial direction and the circumferential direction in a state of being sequentially overlapped without a gap.

Further, in the present embodiment, the hexagonal segment 40 has a face side axial joint surface 41, a wellhead side axial joint surface 42, a face side diagonal joint surface 43, and a wellhead side diagonal joint surface 44. As shown in (d), the outer seal groove 46a for attaching the sealing material is continuously formed over the entire circumference at a distance from the outer peripheral surface, and is spaced from the inner peripheral surface. The inner seal groove 46b for attaching the seal material is continuously formed over the entire circumference.

Further, in the present embodiment, the hexagonal segment 40 has the face side axial joint surface 41, the wellhead side axial joint surface 42, the face side diagonal joint surface 43, and the wellhead side diagonal joint surface 44 on the inner peripheral surface side of the tunnel. A notch portion 46c for attaching the caulking material is continuously formed along the edge portion of the entire circumference.

In the present embodiment, the hexagonal segment 40 is, for example, similar to the hexagonal segment (hexagonal segment) described in Japanese Patent No. 3253870, from the side regions on both sides of the axial joint surface 41 on the face side to the wellhead side. An oblique bolt insertion hole 47a is provided so as to extend and penetrate in parallel with the diagonal joint surface 43 on the face side toward the central portion of the oblique joint surface 44. At the end of each diagonal bolt insertion hole 47a on the face side axial joint surface 41 side, a fastening recess 47b for fastening the head of the connecting bolt member (not shown) is provided, and the opening surface is provided in the face side axial direction. It is formed by opening the joint surface 41. A positioning recess 47c is provided in a portion of the face-side axial joint surface 41 on the face-side diagonal joint surface 43 side of each fastening recess 47b. The axial joint surface 42 on the wellhead side of the hexagonal segment 40 is provided with a convex portion 47d for positioning at a position corresponding to the concave portion 47c for positioning in the side regions on both sides.

Further, in the present embodiment, the pair of face-side diagonal joint surfaces 43 of the hexagonal segments 40 are provided with female screw holes 48a at their central portions. The female screw hole 48a is formed when the diagonal joint surface 43 on the face side of the hexagonal segment 40 installed in advance is superposed on the diagonal joint surface 44 on the wellhead side of the hexagonal segment 40 to be installed subsequently. The bolt insertion hole 47a provided in the hexagonal segment 40 is linearly communicated with the end opening 47e on the opposite side of the fastening recess 47b.

Further, in the present embodiment, similarly to the hexagonal segment (hexagonal segment) described in, for example, Japanese Patent No. 3253870, the face side diagonal joint surface 43 and the wellhead side diagonal joint surface 44 of the hexagonal segment 40 are preceded. Positioning for guiding the subsequent hexagonal segment 40 to be accurately positioned at the space between each pair of equipedular trapezoidal portions adjacent to each other in the circumferential direction by the hexagonal segment 40 installed in the above direction. A guide convex portion 49a and a guide concave portion 49b for each are provided.

Furthermore, in the present embodiment, the hexagonal segment 40 is provided with a gripping hole 49c in the central portion of the inner side surface so that the hexagonal segment 40 can be gripped by an assembly Elector device (not shown). In addition, a pair of lifting insert fittings 49d that enable the hexagonal segment 40 to be lifted are provided in the side regions on both sides of the wellhead side axial joint surface 42.

In the present embodiment, the hexagonal segment 40 having the above-described configuration can be formed by pouring concrete into the hexagonal segment manufacturing formwork 10 shown in FIGS. 1 to 3 and hardening the concrete. The hexagonal segment manufacturing formwork 10 stands on a bottom plate portion 11 having a bottom plate 11a which is a curved portion along the inner peripheral surface of the hexagonal segment 40 and on both side edges of the bottom plate portion 11 by the bottom plate 11a. A curved shape along the face side side plate portion 12 having a side plate 12a which is a curved shape portion along the face side axial joint surface 41 of the hexagonal segment 40 and a curved shape along the wellhead side axial joint surface 42. A V-shaped shape along the V-shaped circumferential joint surface 45, which is arranged upright on both side edge portions of the bottom plate portion 11a of the bottom plate portion 11 and the wellhead side side plate portion 13 having the side plate 13a which is a portion. A pair of end plate portions 14 having a V-shaped end plate 14a which is a portion, and a base portion 30 that integrally supports the bottom plate portions 11, side plate portions 12, 13 and the end plate portions 14 from below. It is configured to include.

The bottom plate portion 11 is formed by a plurality of steel columns 31 (see FIG. 2) in which a bottom plate 11a made of a steel plate curved in an arc shape along the inner peripheral surface of the hexagonal segment 40 is erected from the base portion 30. , It is configured by fixing it while supporting it from below. Similar to the hexagonal segment manufacturing formwork described in Japanese Patent No. 3481769, the steel support column 31 has a plurality of shaft insertion members 33 (see FIG. 1) constituting the side plate advancing / retreating mechanism 32 of the bottom plate 11a. It is fixed in a state of being extended in the width direction. The plurality of shaft insertion members 33 were fixed to the face side plate portion 12 and the wellhead side plate portion 13 at positions corresponding to these shaft insertion members 33 in a state of extending in the width direction of the bottom plate 11a. By inserting and supporting the side plate portion slide shaft 34 (see FIG. 1) constituting the side plate advancing / retreating mechanism 32 so as to be able to advance / retreat, the side plate 12a of the face side side plate portion 12 and the side plate 13a of the wellhead side side plate portion 13 can be inserted into the bottom plate. It can be separated from the side edge portion of the 11a or brought into contact with the side edge portion of the bottom plate 11a.

Further, as shown in FIG. 6, the bottom edge portion of the bottom plate 11a constituting the bottom plate portion 11 protrudes downward from the lower surface side in a state of extending in parallel with the end plate 14a. A fixed rib plate 11b is attached to which one end of the slide guide shaft 21 of the advance / retreat guide portion 23, which will be described later, is fixed. The fixed rib plate 11b is reinforced by the reinforcing rib plate 11c fixed to the bottom plate 11a via welding or the like, and is firmly attached to the lower part of the bottom plate 11a via welding or the like. Further, as shown in FIGS. 1 and 3, a gripping hole insert member 11d for forming a gripping hole 49c in the central portion of the inner side surface of the hexagonal segment 40 stands in the central portion on the upper surface side of the bottom plate 11a. It is installed in the installed state.

The face side plate portion 12 and the wellhead side plate portion 13 include an inner surface that curves in an arc shape as a curved portion along the face side axial joint surface 41 and the wellhead side axial joint surface 42 of the hexagonal segment 40. Including the side plate 12a on the face side and the side plate 13a on the wellhead side, and the face side support wall portion 12b and the wellhead side support wall portion 13b extending below these side plates as a unit and continuously to the lower region of the bottom plate 11a. It is configured. The side plates 12a on the face side and the side plates 13a on the wellhead side are integrally joined so as to project vertically outward from the upper edge portion and the end edge portions on both sides, and the outer peripheral reinforcing plates 12c and 13c in the shape of a strip plate. Is fixed via welding or the like, and is integrally joined to the outer surfaces of the side plate 12a on the face side and the side plate 13a on the wellhead side, and the radial reinforcing plates 12d and 13d (see FIG. 2) are welded or the like. It is fixed via. As a result, the side plate 12a on the face side and the side plate 13a on the wellhead side are firmly reinforced.

Further, in the present embodiment, a pair of convex sockets 12e for forming a positioning recess 47c on the face side axial joint surface 41 of the hexagonal segment 40 on the inner surface of the side plate 12a of the face side side plate portion 12. Is attached (see FIG. 1). A pair of concave plugs 13f for forming a convex portion 47d for positioning is attached to the inner side surface of the side plate 13a of the wellhead side side plate portion 13 on the wellhead side axial joint surface 42 of the hexagonal segment 40.

The side plate portion 12b and the wellhead side support wall portion 13b form a side plate advancing / retreating mechanism 32 similar to the side plate advancing / retreating mechanism of the hexagonal segment manufacturing formwork described in Japanese Patent No. 3481769. The slide shaft 34 (see FIG. 1) is integrally joined. By inserting and supporting the side plate portion slide shaft 34 through the shaft insertion member 33 (see FIG. 1) fixed to the steel support column 31 erected from the base portion 30 that supports the bottom plate 11a of the bottom plate portion 11. By operating the known advancing / retreating operation unit 35 (see FIGS. 1 and 3), the side plate 12a on the face side integrated with the support wall portion 12b on the face side and the support wall portion 13b on the wellhead side became integrated. The side plates 13a on the wellhead side can be moved in the directions of approaching and separating from each other so as to be able to move forward and backward.

As shown in FIGS. 1 and 3, the pair of end plate portions 14 arranged at the edge portions on both sides of the bottom plate portion 11 in the longitudinal direction are respectively provided on the V-shaped circumferential joint surface 45 of the hexagonal segment 40. An end plate 14a having a V-shaped bent inner surface as a V-shaped portion along the line, and an end plate support wall portion 14b extending below the end plate 14a and extending to a lower region of the bottom plate 11a. Is configured to include. The end plate 14a is integrally joined to the upper edge portion and the end edge portions on both sides so as to project vertically outward in the advancing / retreating direction, and the strip-shaped outer peripheral reinforcing plate 14c is welded or the like. Along with being fixed, the vertical reinforcing plate 14d (see FIG. 3) is integrally joined to the outer surface of the end plate 14a, and is fixed via welding or the like.

Further, in the present embodiment, on the inner surface of the end plate 14a of the end plate portion 14, a guide convex portion 49a for positioning is provided on each of the face side diagonal joint surface 43 and the wellhead side diagonal joint surface 44 of the hexagonal segment 40. And the hypotenuse convex socket 14h and the hypotenuse concave plug 14i for forming the guide recess 49b are attached (see FIG. 1).

Further, in the present embodiment, the end plate support wall portion 14b of the end plate portion 14 is arranged at the top of the V-shape as shown in FIGS. 3 and 4, and is an advancing / retreating operation portion of the end plate advancing / retreating mechanism 20. The advancing / retreating bolts 25a and the like forming the 25 are attached, and the bearings 22 and the like which are arranged at the center of each of the pair of V-shaped hypotenuses and form the advancing / retreating guide portion 23 of the end plate advancing / retreating mechanism 20 are attached. It is attached. That is, in the present embodiment, the advancing / retreating operation portion 25 of the end plate advancing / retreating mechanism 20 is preferably provided in the end plate portion 14 below the top portion of the end plate 14a forming the V-shaped portion. The advance / retreat guide portions 23 of the advance / retreat mechanism 20 are preferably arranged symmetrically in pairs on both sides of the advance / retreat operation portion 25, and preferably on both sides of the end plate 14a forming the V-shaped portion in the end plate portion 14. It is provided in each lower part of the hypotenuse.

As shown in FIGS. 4 and 5, the advancing / retreating operation unit 25 of the end plate advancing / retreating mechanism 20 is the same as the advancing / retreating operation unit of the end plate portion of the hexagonal segment manufacturing formwork described in Japanese Patent No. 34817769. It has the configuration of. The advancing / retreating operation portion 25 is provided on the lower surface of the lower plate 14j of the end plate supporting wall portion 14b by winding or loosening the advancing / retreating bolt 25a attached to the end plate supporting wall portion 14b of the end plate portion 14. By moving the guide rail 25b through the guide roller 25d by the rotation of the guide roller 25d supported by the pedestal 25c provided on the base 30, the pair of end plate portions 14 are moved with respect to the bottom plate portion 11. It is possible to move forward and backward in the directions of approaching and separating (see the alternate long and short dash line in FIG. 5).

Then, in the present embodiment, as shown in FIGS. 4 and 6, one end of the advancing / retreating guide portion 23 of the end plate advancing / retreating mechanism 20 is fixed to the fixed rib plate 11b of the bottom plate portion 11 by welding or the like, and the other It is configured to include a slide guide shaft 21 whose end portion is fixed to a support bracket 36 attached to a base portion 30 by welding or the like, and a bearing 22 fixed to an end plate support wall portion 14b of the end plate portion 14. ing.

The slide guide shaft 21 is preferably a cylindrical or cylindrical metal shaft member, one end of which is fixed to the fixed rib plate 11b and the other end of which is fixed to the support bracket 36. , Advancing and retreating the end plate portion 14, preferably extending linearly in the advancing and retreating direction along the length direction of the hexagonal segment 40 perpendicular to the V-shaped circumferential joint surface 45 of the hexagonal segment 40 to be formed. It will be firmly attached in the installed state. That is, as described above, the fixed rib plate 11b is firmly fixed to the bottom plate 11a of the bottom plate portion 11 which is supported and fixed to the base portion 30 via the steel support column 31 by welding or the like, and is supported. Since the bracket 36 is also firmly fixed to the base portion 30 via welding or the like, the slide guide shaft 21 whose both ends are firmly fixed to these members extends linearly in the advancing / retreating direction. It is possible to hold the welded state firmly and stably.

The bearing 22 is a component that receives a load from a mating component that rotates or reciprocates and is supported by a shaft or the like, and preferably a rolling bearing such as a ball bearing such as a ball bearing can be used. More specifically, it is preferable to use a linear bush that can be used in combination with a cylindrical shaft to form a linear motion system capable of infinite linear motion.

In the present embodiment, the bearing 22 is inserted into, for example, the end plate support wall portion 14b of the end plate portion 14 in a state where the slide guide shaft 21 which is a cylindrical shaft having both ends fixed is inserted inside the outer cylinder portion 22a. By fixing the outer cylinder portion 22a to the support plate 14f of the provided support pedestal 14e by welding or the like, the outer cylinder portion 22a is firmly fixed to the end plate support wall portion 14b as a unit. As a result, the end plate portion 14 is guided by the slide guide shaft 21 via the bearing 22 and is preferably formed in the hexagonal segment 40 in the advancing / retreating direction perpendicular to the V-shaped circumferential joint surface 45. It is possible to move back and forth accurately and smoothly along the length direction of the square segment 40.

Further, in the present embodiment, a slide roller 38 supported by the roller support bracket 37 is attached to a portion of the base portion 30 directly below the end plate portion 14 adjacent to the support bracket 36 (see FIG. 6). A slide rail 14g provided on the lower end surface of the end plate support wall portion 14b of the end plate portion 14 comes into contact with the slide roller 38, and the end plate portion 14 can be slid along the slide roller 38. It has become like. As a result, the end plate portion 14 is in a more stable state along the length direction of the hexagonal segment 40 in the advancing / retreating direction perpendicular to the V-shaped circumferential joint surface 45 of the hexagonal segment 40 preferably formed. It becomes possible to move forward and backward smoothly.

In order to form the hexagonal segment 40 by using the hexagonal segment manufacturing formwork 10 of the present embodiment having the above-described configuration, the end plate portion 14 is formed by the end plate advancing / retreating mechanism 20 and the side plate advancing / retreating mechanism 32 described above. By advancing and retreating the plate 14a and the side plates 12a and 13a of the side plate portions 12 and 13, these are brought into contact with each other in a state of being erected on both side edge portions and both side edge portions of the bottom plate 11a of the bottom plate portion 11. , A casting space for pouring concrete is formed above the bottom plate 11a. Further, reinforcing bars are appropriately arranged in the formed casting space, and as shown in FIG. 1, for example, the reinforcing bars and block members are supported to support the hexagonal segment 40 with diagonal bolt insertion holes 47a. A sheath tube 26 for forming the female screw hole 48a, a female screw anchor 27 for forming the female screw hole 48a, and a lifting insert metal fitting 49d capable of lifting the hexagonal segment 40 are installed. After that, concrete is poured into the casting space above the bottom plate 11a, and the outer peripheral surface of the cast concrete is troweled along the arcuate curved surface.

When the cast concrete is hardened and a predetermined curing period has elapsed, the end plate 14a of the end plate 14 and the side plates 12a and 13a of the side plates 12 and 13 are used by the end plate advancing / retreating mechanism 20 and the side plate advancing / retreating mechanism 32 described above. Is demolded by advancing and retreating, retracting from the hardened concrete and separating it. As a result, the formed hexagonal segment 40 can be easily taken out from the hexagonal segment manufacturing form 10.

According to the hexagonal segment manufacturing formwork 10 of the present embodiment having the above-described configuration, the end plate portion is more accurately and more stable in a predetermined direction at the time of demolding even when it is repeatedly used many times. It allows the state to recede, allowing it to continue to form good quality hexagonal segments.

That is, according to the present embodiment, one end of the advancing / retreating guide portion 23 of the end plate advancing / retreating mechanism 20 for advancing / retreating the pair of end plate portions 14 in the directions of approaching and separating from the bottom plate portion 11 is at the bottom plate portion 11. In a state where the other end is fixed to the base portion 30 while being fixed, the slide guide shaft 21 is provided so as to extend linearly in the advancing / retreating direction of the end plate portion 14 and is fixed to the end plate portion 14. In this state, it is composed of a bearing 22 provided so as to be slidable along the slide guide shaft 21.

As a result, according to the present embodiment, by guiding the advancing / retreating guide unit 23 at the time of demolding, each end plate portion 14 is guided by the advancing / retreating operation unit 25 along the length direction of the hexagonal segment 40 to be formed. Preferably, the hexagonal segment 40 can be retracted linearly and accurately in the advancing / retreating direction perpendicular to the V-shaped circumferential joint surface 45. Therefore, for example, the bottom plate 11a and the end plate 14 of the bottom plate portion 11 It is possible to effectively avoid cracks and chips easily occurring at the time of demolding at the joint angle portion with the end plate 14a of the hexagonal segment 40, and in particular, the V-shaped circumferential joint surface 45 of the hexagonal segment 40. Even when the guide convex portion 49a and the guide concave portion 49b for positioning are formed on the diagonal joint surface 43 on the face side and the diagonal joint surface 44 on the wellhead side, cracks or chips occur in these uneven portions at the time of demolding. It becomes possible to effectively avoid the tendency.

Further, according to the present embodiment, in the advancing / retreating guide portion 23 formed by the slide guide shaft 21 and the bearing 22, both ends of the slide guide shaft 21 formed of a cylindrical or cylindrical shaft member are fixed ribs of the bottom plate portion 11. It is fixed to the plate 11b and the support bracket 36 of the base portion 30, respectively, and extends linearly and accurately in the advancing / retreating direction of the end plate portion 14 to be firmly attached, and is preferably a rolling bearing near. The bearing 22 by the bush is firmly attached to the support frame 14e provided on the end plate support wall portion 14b of the end plate portion 14 so that the bearing 22 can slide and move in a stable state along the slide guide shaft 21. Therefore, as in the conventional advancing / retreating guide portion (see FIG. 8) that slides the overhanging portion of the slad shaft in the shape of a cantilever between the upper and lower slide roller pins, the mold is repeatedly used. By effectively avoiding lateral movement (serking) and rattling due to eccentricity and eccentric load due to fatigue, it is possible to maintain an accurate and stable state for a long period of time. By advancing and retreating the end plate portion 14, it becomes possible to continuously form a hexagonal segment having good quality many times.

Further, according to the present embodiment, the advancing / retreating operation unit 25 of the end plate advancing / retreating mechanism 20 is provided in the lower portion of the top of the V-shaped portion by the end plate 14a, and the advancing / retreating guide unit 23 is the advancing / retreating operation unit 25. Since a pair of symmetrically arranged ends plates 14a are provided on both sides of the V-shaped portion below the hypotenuse portion on both sides of the end plate 14a, the end plate 14a which is the V-shaped portion is more well-balanced. By making it possible to retract and advancing and retreating the end plate portion 14 in a more accurate and stable state, it becomes possible to continue forming a hexagonal segment of good quality.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, the advancing / retreating operation portion of the end plate advancing / retreating mechanism does not necessarily have to be provided in the lower portion of the top of the V-shaped portion of the end plate portion, and the advancing / retreating guide portion of the end plate advancing / retreating mechanism is arranged symmetrically. It is not always necessary to provide a pair.

10 Hexagonal segment manufacturing formwork 11 Bottom plate 11a Bottom plate (curved shape)
11b Fixed rib plate 12 Face side plate portion 12a Side plate (curved shape portion)
12b Face side support wall part 13 Wellhead side side plate part 13a Side plate (curved shape part)
13b Wellhead side support wall 14 End plate 14a End plate (V-shaped part)
14b End plate support wall 14e Support stand 20 End plate advance / retreat mechanism 21 Slide guide shaft 22 Bearing 22a Outer cylinder 23 Advance / retreat guide 25 Advance / retreat operation 25a Advance / retreat bolt 30 Base 32 Side plate advance / retreat mechanism 33 Shaft insertion member 34 Side plate Slide shaft 35 Advance / retreat operation part 36 Support bracket 40 Hexagonal segment 41 Face side axial joint surface 42 Wellhead side axial joint surface 43 Face side diagonal joint surface 44 Wellhead side diagonal joint surface 45 V-shaped circumferential joint surface

Claims (3)

Face side diagonal joint surface and wellhead side diagonal joint surface and wellhead side diagonal joint surface and wellhead side are arranged in a V shape so as to connect the face side axial joint surface and wellhead side axial joint surface and the ends on both sides of these pair of axial joint surfaces, respectively. In a hexagonal segment manufacturing formwork for forming a hexagonal segment having a pair of V-shaped circumferential joint surfaces composed of side diagonal joint surfaces by pouring concrete and hardening it.
A bottom plate portion having a curved shape portion along the inner peripheral surface of the hexagonal segment and a curvature along the face side axial joint surface which are erected and arranged on both side edge portions of the bottom plate portion. The face side plate portion having a shaped portion, the wellhead side plate portion having a curved shape portion along the axial joint surface on the wellhead side, and the edge portions on both sides of the bottom plate portion were erected and arranged. Includes a pair of end plate portions having a V-shaped portion along the V-shaped circumferential joint surface, and a base portion that integrally supports the bottom plate portion, side plate portions, and end plate portions from below. It is composed and
The face side plate portion and the wellhead side plate portion are arranged so as to be able to advance and retreat in directions approaching and separating from each other via a side plate advancing / retreating mechanism supported by the base portion, and the pair. The end plate portion is arranged so as to be able to advance and retreat in the directions of approaching and separating from the bottom plate portion via an end plate advancing / retreating mechanism provided supported by the base portion.
The end plate advancing / retreating mechanism is provided so as to extend linearly in the advancing / retreating direction of the end plate portion in a state where one end is fixed to the bottom plate portion and the other end is fixed to the base portion. The advancing / retreating guide portion including the slide guide shaft and the bearing provided so as to be slidable along the slide guide shaft while being fixed to the end plate portion, and the advancing / retreating portion for advancing / retreating the pair of end plate portions. A mold for manufacturing hexagonal segments that includes an operation unit. The advancing / retreating operation portion of the end plate advancing / retreating mechanism is provided in a lower portion of the top of the V-shaped portion of the end plate portion, and the advancing / retreating guide portion of the end plate advancing / retreating mechanism has the advancing / retreating operation portion. The hexagonal segment manufacturing form according to claim 1, wherein a pair of symmetrically arranged formwork is provided on both sides of the end plate portion below the hypotenuse portions on both sides of the V-shaped portion. The hexagonal segment manufacturing according to claim 1 or 2, wherein the slide guide shaft of the advance / retreat guide portion is a cylindrical or cylindrical shaft member, and the bearing is a cylindrical rolling bearing. Formwork.

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