Segment assembly apparatus and segment assembly method

Abstract

The present invention provides a segment assembly apparatus and segment assembly method that eliminate the need for the installation and removal of internal scaffolding. [Solution] In the segment assembly apparatus SA according to the present invention, the inner scaffolding 6 is configured to be movable along the rail 3 via a pair of drive wheels, namely the first drive wheel 41 and the second drive wheel 42. By moving the inner scaffolding 6 along the rail 3 according to the circumferential position of each segment 11 to be assembled, the installation and removal of the inner scaffolding 6 when assembling each segment 11 can be omitted.

Description

【Technical Field】 【0001】 The present invention relates to a segment assembling device and a segment assembling method used for assembling steel segments constituting a split-assembled earth retaining wall (caisson). 【Background Art】 【0002】 As a conventional means for assembling steel segments, for example, those described in Patent Document 1 below are known. 【0003】 In the steel segment pressing method, the assembling work of steel rings and the excavation work are performed alternately. Therefore, in the conventional means for assembling steel segments, after the excavation is completed, an inner scaffold is installed to perform the assembling work of the steel segments, and after the assembling of the steel segments, the inner scaffold is removed and the excavation work is performed again repeatedly, and a split-assembled earth retaining wall (caisson) composed of stacking a plurality of steel rings is press-fitted and sunk. 【Prior Art Documents】 【Patent Documents】 【0004】 【Patent Document 1】 Japanese Unexamined Patent Application Publication No. 2023-130553 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0005】 However, in the conventional means for assembling steel segments, it was necessary to replace the inner scaffold as the steel rings were stacked. Therefore, there was still room for improvement in that the work related to the installation and removal of the inner scaffold was a burden. 【0006】 In particular, the inner scaffold was divided into disk-shaped planar scaffolds having approximately the same shape as the inner diameter of the steel segment into sizes that could be transported. Therefore, as the inner diameter of the segment increased, the outer diameter of the inner scaffold increased, resulting in an increase in the perimeter of the inner scaffold and an increase in the unit time required for the installation work of the inner scaffold. 【0007】 This invention was devised in view of the aforementioned technical problems, and aims to provide a segment assembly device and segment assembly method that can eliminate the need for the installation and removal of internal scaffolding. [Means for solving the problem] 【0008】 One embodiment of the present invention is a segment assembly device installed in a segment press-in device, which constructs a submerged structure by arranging segments suspended by a lifting machine in parallel in the circumferential direction on an annular first ring body formed by connecting a plurality of arc-shaped segments in the circumferential direction, and connecting the segments to each other to assemble an annular second ring body, and is characterized by comprising: a rail erected along the inner circumference of the press-in girder of the segment press-in device; at least a pair of drive wheels that are driven and controlled by a motor and move on the rail; a pair of support columns connected to the pair of drive wheels and suspended from the rail via the pair of drive wheels; and an inner scaffold that is suspended from the pair of support columns and extends along the circumferential direction of the rail and is generally arc-shaped. 【0009】 Thus, in this invention, the inner scaffolding is configured to be movable along rails via a pair of drive wheels. Therefore, when assembling segments, the inner scaffolding can be moved along rails, eliminating the need to set up and remove the inner scaffolding during segment assembly. 【0010】 Furthermore, in another embodiment of the segment assembly apparatus, it is desirable that the pair of support columns are positioned at both ends of the inner scaffolding in the circumferential direction, and that both ends of the inner scaffolding in the circumferential direction are suspended and supported by the rail via the pair of drive wheels. 【0011】 In this configuration, both circumferential ends of the inner scaffold are suspended and supported by rails via a pair of drive wheels, and the inner scaffold is supported by rails over its widest span. This allows the inner scaffold to be moved or supported more stably relative to the rails. 【0012】 Furthermore, in yet another embodiment of the segment assembly apparatus, it is desirable to include guide wheels provided between the pair of drive wheels in the circumferential direction and rolling on the rails in accordance with the pair of drive wheels. 【0013】 In this configuration, in addition to a pair of drive wheels, guide wheels are provided to assist the movement of the inner scaffolding on the rails, and the inner scaffolding is configured to be movable on the rails via the pair of drive wheels and guide wheels. In this way, the movement of the inner scaffolding on the rails is assisted by the guide wheels, which suppresses the horizontal (radial) movement (sway) of the inner scaffolding. 【0014】 Furthermore, in yet another embodiment of the segment assembly apparatus, it is desirable to provide a fixing means that can fix the inner scaffold to the first ring body when the pair of drive wheels are stopped. 【0015】 In this configuration, the inner scaffolding can be fixed to the first ring body by the fixing means while the drive wheels are stopped. That is, by fixing the inner scaffolding to the first ring body while the drive wheels are stopped, the inner scaffolding can be held stably when a worker performs segment connection work on the inner scaffolding, and the segment assembly work can be carried out more efficiently. 【0016】 Furthermore, in yet another embodiment of the segment assembly apparatus, it is desirable that the fixing means mechanically connects the inner scaffolding and the first ring body. 【0017】 In this configuration, the inner scaffold and the first ring body are mechanically connected by a mechanical fixing means, such as a chain block. This makes it possible to suppress horizontal (radial) movement (swaying) of the inner scaffold when the drive wheels are stopped. As a result, when a worker performs segment connection work on the inner scaffold, the inner scaffold is stably held by the first ring body, allowing the segment assembly work to be carried out more efficiently. 【0018】 Furthermore, in yet another embodiment of the segment assembly apparatus, it is preferable that the fixing means is provided on the side of the inner scaffolding so as to protrude toward the segment side and comprises a roller that rolls on the inner circumferential surface of the first ring body, and an electromagnet embedded inside the roller. 【0019】 In this configuration, when the drive wheels rotate, the rollers roll on the inner surface of the segment, allowing the inner scaffolding to move smoothly. When the drive wheels stop, the magnetic force of the electromagnets embedded in the rollers can fix the inner scaffolding to the segment. That is, when the drive wheels are driven, the rollers rotate, releasing the fixing state of the inner scaffolding by the electromagnets. Conversely, when the drive wheels stop, the magnetic force generated by the electromagnets automatically fixes the inner scaffolding to the segment as the rollers stop. This eliminates the need to fix the inner scaffolding when the drive wheels stop and release it when the drive wheels start moving, thereby reducing the workload associated with moving the inner scaffolding. 【0020】 Furthermore, because electromagnets are embedded inside the rollers, the magnetic force of the electromagnets can be applied even when the rollers are rotating, making it possible to roll the rollers without them separating from the inner surface of the segments. As a result, not only when the inner scaffolding is stopped, but also when it is moving in the circumferential direction, radial movement of the inner scaffolding, especially movement away from the segments, can be suppressed, ensuring stable movement of the inner scaffolding. 【0021】 As yet another aspect of the segment assembling device, the segment has a peripheral wall provided on the outer peripheral side, and a plurality of horizontal ribs provided so as to project to the inner peripheral side of the peripheral wall, being parallel and spaced apart from each other at a predetermined interval in the vertical direction of the peripheral wall and extending along the circumferential direction of the peripheral wall, and a plurality of vertical ribs provided so as to project to the inner peripheral side of the peripheral wall, being parallel and spaced apart from each other at a predetermined interval in the circumferential direction of the peripheral wall and extending along the vertical direction of the peripheral wall to connect the horizontal ribs to each other. It is desirable that the roller rolls along the inner end face of the horizontal rib. 【0022】 In such an aspect, the roller is configured to roll along the horizontal rib. In other words, the width of the roller is set to a relatively small width corresponding to the horizontal rib. Thereby, the fixing means can be miniaturized and the manufacturing cost of the device can be reduced. 【0023】 As yet another aspect of the segment assembling device, the roller is formed in a cylindrical shape having an axial length longer than the vertical width of the horizontal rib, the electromagnet has an axial length longer than the roller, and includes an iron core accommodated in the inner peripheral side of the roller, a coil wound around the outer peripheral side of the iron core, and a blocking ring that covers the outer peripheral side of the coil to constitute a part of the roller and forms magnetic poles at both axial ends by blocking the magnetic field of the coil when the coil is energized. It is desirable that the roller has such components. 【0024】 In such an aspect, since the roller is set to have an axial length relatively long with respect to the width in the extending direction of the horizontal rib, stable rolling of the roller on the inner peripheral side of the segment can be ensured by the wide roller. 【0025】 Furthermore, since the roller is formed wide, it is not necessary to align the mounting position of the roller with the height position of the horizontal rib of the segment, and the versatility of the segment assembling device can be improved. 【0026】 Also, a part of the roller facing the segment is constituted by a blocking ring capable of blocking the magnetic field lines of the coil. Therefore, by means of the blocking ring, it becomes possible to amplify the magnetic force (adsorption force) of the electromagnet when the coil is energized. Thereby, the relative movement of the roller with respect to the segment is firmly restricted, and the holding force of the inner scaffold can be improved. 【0027】 Also, as one aspect of a segment assembly method for constructing the immersed structure by assembling the segment using the segment assembly device, a first step of assembling the first ring body, a second step of performing excavation work after the first step, and a third step of assembling the second ring body by arranging a plurality of the segments on the first ring body after the second step are preferably provided. 【0028】 Also, as another aspect of the segment assembly method, in the second step, when excavating directly below the inner scaffold, after driving the motor to move the inner scaffold in the circumferential direction, the excavation is performed, and in the second step, when excavating other than directly below the inner scaffold, it is desirable to perform the excavation while maintaining the position of the inner scaffold. 【0029】 In such an aspect, when performing the excavation work, when excavating directly below the inner scaffold, the excavation is performed after moving the inner scaffold to a circumferential position that does not interfere with the excavation work, while when excavating other than directly below the inner scaffold, the excavation is performed while maintaining the position of the inner scaffold. Thereby, when performing the excavation work, the excavation work can be appropriately performed without removing the inner scaffold. 【Effects of the Invention】 【0030】 According to the present invention, the internal scaffolding is configured to be movable along rails via a pair of drive wheels. Therefore, when assembling segments, the internal scaffolding can be moved along rails according to the circumferential position of the segment, thereby eliminating the need to set up and remove the internal scaffolding during segment assembly. This reduces the time required for pressing in the segments, and consequently shortens the construction period. [Brief explanation of the drawing] 【0031】 [Figure 1] This is an enlarged perspective view of the main part of the segment assembly apparatus according to the present invention, viewed from diagonally above. [Figure 2] This is a plan view of the segment assembly apparatus according to the present invention. [Figure 3] Figure 1 shows a magnified view of the area near the drive wheel, illustrating the main components of the segment assembly device. [Figure 4] This is a cross-sectional view along line AA in Figure 3. [Figure 5] Figure 3 is a cross-sectional view along line BB. [Figure 6] This is an enlarged view of the main part of a segment assembly device, showing an enlarged view of the area near the roller in Figure 1, illustrating the first embodiment of the present invention. [Figure 7] This is an enlarged perspective view of the main part of a segment assembly device showing a modified example of the first embodiment of the present invention. [Figure 8] This diagram illustrates a segment assembly method according to the present invention, showing a configuration in which an excavation is performed at a location separated from the internal scaffolding. [Figure 9] This diagram illustrates a segment assembly method according to the present invention, and shows an aspect of excavating a position that overlaps with the internal scaffolding. [Figure 10] This is an enlarged perspective view of the main part of a segment assembly apparatus according to a second embodiment of the present invention. [Figure 11] Figure 10 is a partial cross-sectional view of the roller. [Modes for carrying out the invention] 【0032】 The following describes in detail, with reference to the drawings, each embodiment of the segment assembly apparatus and segment assembly method according to the present invention. In the following embodiments, the present invention is applied to the press-in and sinking of a caisson structure as a retaining wall for sinking, which is assembled from well-known RC segments. In the following description, the direction perpendicular to the press-in direction of the caisson structure 1 is referred to as the "radial direction," and the direction around the press-in direction of the caisson structure 1 is referred to as the "circumferential direction." 【0033】 [First Embodiment] Figures 1 to 6 show a segment assembly apparatus SA according to the first embodiment of the present invention, Figure 7 shows a modified example of the roller 84 according to the first embodiment of the present invention, and Figures 8 to 9 show a segment assembly method using the segment assembly apparatus SA according to this embodiment. For convenience, the following will be explained in separate sections: segment assembly apparatus, segment assembly method, and the effects of this embodiment. 【0034】 (Segment assembly machine) As shown in Figures 1 and 2, the open caisson method involves pressing and sinking a caisson structure 1, which is a cylindrical, segmented and assembled earth retaining wall, into a shaft drilled in the ground. The caisson structure 1 is formed by connecting multiple arc-shaped segments 11, which are equally divided in the circumferential direction, in both horizontal and vertical directions. The caisson structure 1 is assembled by stacking vertically arranged, roughly cylindrical ring bodies 10, each formed by connecting segments 11 in the circumferential direction, on a cutting ring (not shown) installed at the bottom of the pit. 【0035】 Here, each segment 11 constituting the ring body 10 is integrally formed with a peripheral wall 12 provided on the outer circumference, a pair of main girders, a segment upper wall 13 and a segment bottom wall 14, provided projecting inward from the upper and lower ends of the peripheral wall 12, respectively, a third main girder, a transverse rib 15, provided in the vertical intermediate portion between the segment upper wall 13 and the segment bottom wall 14 so as to project inward from the peripheral wall 12 and extending along the circumferential direction of the peripheral wall 12, and multiple longitudinal ribs 16 arranged in the circumferential direction of the peripheral wall 12 so as to project inward from the peripheral wall 12 and extending vertically to connect the segment upper wall 13 and the transverse rib 15, and the segment bottom wall 14 and the transverse rib 15, respectively. 【0036】 In this embodiment, the segment 11 is a three-girder segment having three main girders consisting of a segment upper wall 13, a segment bottom wall 14, and a transverse rib 15. However, in addition to the three-girder segment 11 described above, a two-girder segment composed of a pair of upper and lower main girders consisting of a segment upper wall 13 and a segment bottom wall 14 may also be a segment to which the present invention can be applied. 【0037】 The segments 11 are then fastened together using joint members (not shown) and bolts and nuts (not shown). The connection (fastening) of each of these segments 11 is performed manually by workers who are on the inner scaffolding 6 of the segment assembly device SA installed on the press-fit girder 2. That is, each time a ring body 10 is assembled, the caisson structure 1 is pressed in by the height of that ring body 10, and the connection of each segment 11 is performed by workers on the inner scaffolding 6, which is maintained at a predetermined vertical height. 【0038】 The segment assembly device SA comprises a rail 3 installed along the inner circumference of a press-fit girder 2, a first drive wheel 41 and a second drive wheel 42 which are at least one pair of drive wheels driven and controlled by a motor 40 and movable on the rail 3, a first support column 51 and a second support column 52 which are connected to the first drive wheel 41 and the second drive wheel 42 and supported in a suspended state on the rail 3 via the first drive wheel 41 and the second drive wheel 42, and an inner scaffold 6 which is suspended from the first support column 51 and the second support column 52 and extends along the circumferential direction of the rail 3 and is generally arc-shaped. 【0039】 The rail 3 consists of a plurality of support members 31 arranged at equal intervals in the circumferential direction on the inner circumference of the ring-shaped press-fit girder 2, and a rail body 32 supported below each of the support members 31 and continuous in an annular shape along the circumferential direction of the press-fit girder 2 on the inner circumference of the press-fit girder 2. The rail body 32 is made of a well-known I-beam with an I-shaped cross-section, and is integrally formed with an upper wall 33 and a bottom wall 34 that face each other vertically, and an intermediate wall 35 provided between the upper wall 33 and the bottom wall 34, connecting them at a radial intermediate position between the upper wall 33 and the bottom wall 34. 【0040】 As shown in Figures 1 and 3, the first drive wheel 41 and the second drive wheel 42 are composed of a pair of wheels, a drive wheel 43 and a driven wheel 44, which are supported by a pair of frames, the first and second frames 401 and 402, respectively, whose lower ends 400 are connected so as to straddle the bottom wall 34 of the rail 3 in the radial direction. The drive wheel 43 is connected to a motor 40 provided at the side end of the first frame 401 and is driven and controlled by the motor 40. The driven wheel 44 is positioned radially opposite to the drive wheel 43, with the intermediate wall 35 of the rail 3 in between, and follows the rolling of the drive wheel 43 driven by the motor 40. In other words, when the first drive wheel 41 and the second drive wheel 42 are driven, the inner scaffolding 6 can move in the circumferential direction along the rail 3. Note that the symbol SW shown in Figure 3 is a controller that drives and controls the motor 40. 【0041】 Furthermore, in this embodiment, guide wheels 7 are provided in the circumferential intermediate portion between the first drive wheel 41 and the second drive wheel 42, as shown in Figures 1 and 4, which roll along the bottom wall 34 of the rail 3 in conjunction with the rolling of the first drive wheel 41 and the second drive wheel 42. These guide wheels 7 are each supported by a pair of wheels 71 and 72 that can roll, supported by first and second frames 701 and 702, which are a pair of frames whose lower ends are connected by a connecting portion 700 so as to straddle the bottom wall 34 of the rail 3 radially. The connecting portion 700 of the first and second frames 701 and 702 is connected to a beam member 50, which will be described later. In other words, the guide wheels 7 that roll along the rail 3 assist the circumferential movement of the inner scaffolding 6 by the first drive wheel 41 and the second drive wheel 42, thereby realizing smooth and stable movement of the inner scaffolding 6. In this embodiment, Figure 1 illustrates a configuration in which two guide wheels 7 are arranged between the first drive wheel 41 and the second drive wheel 42 in the circumferential direction. However, the number of guide wheels 7 can be arbitrarily changed depending on the circumferential distance between the first drive wheel 41 and the second drive wheel 42, whether it be one or multiple. 【0042】 As shown in Figure 1, the first support column 51 and the second support column 52 are vertically extending support columns, with one end (upper end) of each connected to the lower part of the connecting portion 700 of the first drive wheel 41 and the second drive wheel 42, and the other end (lower end) connected to the circumferential ends of the inner scaffolding 6, which will be described later as the first scaffolding end 61 and the second scaffolding end 62. The upper ends of the first support column 51 and the second support column 52 are connected by a beam member 50 that extends in a generally arc shape in the circumferential direction. In this embodiment, the first support column 51 and the second support column 52 are shown as examples of being connected to the circumferential ends of the inner scaffolding 6 (the first scaffolding end 61 and the second scaffolding end 62 described later), but the first support column 51 and the second support column 52 may also be connected to the intermediate part of the inner scaffolding 6 excluding the circumferential ends, for example, and can be connected to any position depending on the arrangement of the first drive wheel 41 and the second drive wheel 42. 【0043】 As shown in Figures 1 and 2, the inner scaffolding 6 is formed in the shape of an arc-shaped plate extending circumferentially on the inner circumference side of the segment 11. It is integrally formed with a beam-shaped base 63 provided in a straight line to connect the first support column 51 and the second support column 52, and an arc-shaped scaffolding body 64 that extends horizontally radially outward (towards the segment 11) from the base 63, with one side corresponding to the so-called chord being supported by the base 63. 【0044】 Furthermore, a rolling mechanism 8 is provided at both circumferential ends of the inner scaffolding 6, which rolls along the transverse ribs 15 of the annularly configured first ring body 101. The rolling mechanism 8 comprises a pair of upper and lower first support members 81 and second support members 82 supported by a roller support portion 80 extending vertically downward from the inner scaffolding 6, a cylindrical shaft member 83 extending vertically and connecting the tips of the first support member 81 and the second support member 82, and a cylindrical roller 84, which is a rolling element, rotatably supported by the shaft member 83. In other words, the rolling mechanism 8 rolls along the end faces of the transverse ribs 15 of the first ring body 101 as the inner scaffolding 6 moves circumferentially, thereby restricting the movement (swing) of the inner scaffolding 6 in the direction approaching the first ring body 101 (see arrow D1 in Figure 2) while enabling smooth circumferential movement of the inner scaffolding 6. 【0045】 Here, the axial width L of the roller 84 constituting the rolling mechanism 8 is not necessarily limited to the width dimension corresponding to the vertical width W of the transverse rib 15 of the segment 11, as shown in Figure 6, for example. In other words, the axial width L of the roller 84 may be set to a vertical width W that is sufficiently larger than the transverse rib 15 of the segment 11, as shown in the modified example in Figure 7, for example. By setting the axial width L of the roller 84 to be relatively large relative to the vertical width W of the transverse rib 15 of the segment 11, as in this modified example, it is not necessary to strictly match the height position of the roller 84 with the height position of the transverse rib 15 of the segment 11, thereby increasing the versatility of the segment assembly device SA. 【0046】 Furthermore, the rollers 84 constituting the rolling mechanism 8 are not necessarily limited to rolling along the lateral ribs 15. In other words, the rolling mechanism 8 may be mounted vertically above the inner scaffolding 6, for example, on the first and second support columns 51 and 52, and configured to roll along the segment upper wall 13. Thus, the rolling surface of the rollers 84 can be changed, for example, according to the number of main girders of the segment 11, and the lateral ribs 15 or segment upper wall 13 can be selected according to the mounting position of the rollers 84. 【0047】 Furthermore, in this embodiment, when connecting the segments 11, the inner scaffolding 6 is fixed to the first ring body 101 via a fixing means MR, such as a well-known chain block, which is capable of mechanically fixing the inner scaffolding 6 to the first ring body 101. In other words, in this embodiment, when connecting the segments 11, the fixing means MR can restrict the movement (swing) of the inner scaffolding 6 in the direction away from the first ring body 101 (see arrow D2 in Figure 2). 【0048】 (Segment assembly method) The following describes the method for assembling a segment (segment 11) using the segment assembly device SA, based on Figures 1, 2, 8, and 9. 【0049】 First, the segments 11 are connected in the circumferential direction to form the first ring body, which is an annular first ring body 101 (first step). Next, the ground is excavated by the height of this first ring body 101 using a well-known clamshell CS (second step). After that, the caisson body 1 is pressed into the ground by the height of the first ring body 101. 【0050】 Next, for example, at the circumferential position shown in Figures 1 and 2, the inner scaffolding 6 is connected and fixed to the first segment 101a constituting the first ring body 101 via the fixing means MR. Then, the first segment 102a constituting the second ring body 102 is suspended by a lifting machine (not shown) and placed on top of the first segment 101a of the first ring body 101. Then, the first segment 102a of the placed second ring body 102 is connected to the segment 101a of the first ring body 101 located below it. 【0051】 Next, in order to assemble the second segment 102b of the second ring body 102 which is circumferentially adjacent to the first segment 102a, the fixing means MR is removed and the inner scaffolding 6 is moved circumferentially along the rail 3 by the unit circumferential length of the first segment 102a. After that, the inner scaffolding 6 is connected and fixed to the second segment 101b of the first ring body 101 via the fixing means MR, and then the second segment 102b of the second ring body 102 is connected to the second segment 101b of the first ring body 101, and the second segment 102b of the second ring body 102 is connected to the first segment 102a of the second ring body 102. 【0052】 In this way, the second ring body 102 is formed on top of the first ring body 101 by repeating the process of connecting each segment 102a, 102b, ... that constitutes the second ring body 102 (third step). Then, returning to the second step, the ground is excavated by the height of the second ring body 102 using a well-known clamshell CS. After that, the caisson body 1 is pressed into the ground by the height of the second ring body 102. 【0053】 In the second step, for example as shown in Figure 8, if the horizontal position of the excavation site by the clamshell CS is separated from the inner scaffolding 6, the excavation is performed by the clamshell CS without moving the inner scaffolding 6, while maintaining the circumferential position of the inner scaffolding 6. On the other hand, if the horizontal position of the excavation site by the clamshell CS coincides with the inner scaffolding 6, for example as shown in Figure 9, the inner scaffolding 6 can be moved (retracted) in the circumferential direction before the excavation is performed by the clamshell CS. 【0054】 (Effects of this embodiment) The characteristic effects and advantages of the segment assembly apparatus SA and segment assembly method according to this embodiment will be described in detail below. 【0055】 According to this embodiment, the inner scaffolding 6 is configured to be movable along the rail 3 via a pair of drive wheels, namely the first drive wheel 41 and the second drive wheel 42. Therefore, by moving the inner scaffolding 6 along the rail 3 according to the circumferential position of the segment 11 to be assembled, it becomes possible to omit the installation and removal of the inner scaffolding 6 when assembling the segment 11. This shortens the time required for the press-fitting work of the caisson structure 1, which is made up of multiple segments 11 connected together, and consequently shortens the construction period. 【0056】 Furthermore, in this embodiment, both circumferential ends of the inner scaffolding 6 are suspended and supported by the rail 3 via a pair of drive wheels, the first drive wheel 41 and the second drive wheel 42, so that the inner scaffolding 6 is supported by the rail 3 over the widest span. This allows the inner scaffolding 6 to be moved or supported more stably relative to the rail 3. 【0057】 Furthermore, in this embodiment, in addition to the pair of drive wheels, the first drive wheel 41 and the second drive wheel 42, guide wheels 7 are provided to assist the movement of the inner scaffolding 6 on the rail 3, and the inner scaffolding 6 is configured to move on the rail 3 via the first drive wheel 41, the second drive wheel 42 and the guide wheels 7. In this way, the movement of the inner scaffolding 6 on the rail 3 is assisted by the guide wheels 7, which makes it possible to suppress the horizontal (radial) movement (sway) of the inner scaffolding 6. 【0058】 Furthermore, in this embodiment, the inner scaffolding 6 can be fixed to the first ring body 101 by the fixing means MR when the first drive wheel 41 and the second drive wheel 42 are stopped. That is, by fixing the inner scaffolding 6 to the first ring body 101 when the first drive wheel 41 and the second drive wheel 42 are stopped, the inner scaffolding 6 can be held stably when a worker performs the segment connection work on the inner scaffolding 6, and the assembly work of the segment 11 can be carried out more efficiently. 【0059】 In particular, in this embodiment, the inner scaffolding 6 and the first ring body 101 are configured to be mechanically connected by a mechanical fixing means MR, such as a chain block. This makes it possible to suppress horizontal (radial) movement (swaying) of the inner scaffolding 6 when the first drive wheel 41 and the second drive wheel 42 are stopped. As a result, when a worker performs segment 11 connection work on the inner scaffolding 6, the inner scaffolding 6 is stably held by the first ring body 101, and the segment 11 assembly work can be carried out more efficiently. 【0060】 Furthermore, in this embodiment, the inner scaffolding 6 is configured to roll on the transverse ribs 15 of the first ring body 101 via a rolling mechanism 8 (roller 84). In this way, by causing the rolling mechanism 8 (roller 84) to roll on the end faces of the transverse ribs 15 of the first ring body 101 as the inner scaffolding 6 moves in the circumferential direction, it is possible to achieve smooth circumferential movement of the inner scaffolding 6 while restricting its movement (swing) in the direction approaching the first ring body 101 (see arrow D1 in Figure 2). 【0061】 Furthermore, in this embodiment, when excavating, if the excavation is to be performed directly beneath the inner scaffolding 6, the inner scaffolding 6 is moved to a circumferential position that does not interfere with the excavation work before excavation is performed. On the other hand, if the excavation is to be performed anywhere other than directly beneath the inner scaffolding 6, the position of the inner scaffolding 6 is maintained while excavation is performed. This makes it possible to perform excavation work appropriately without removing the inner scaffolding 6. 【0062】 [Second Embodiment] Figures 10 and 11 show a second embodiment of the segment assembly apparatus according to the present invention, in which the configuration of the roller 84 in the first embodiment is modified. The basic configuration other than these modifications is the same as in the first embodiment. Therefore, components identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted. 【0063】 Figure 10 shows an enlarged perspective view of the main part of the segment assembly apparatus SA according to the second embodiment of the present invention. Figure 11 shows a cross-sectional view of the rolling mechanism 8 cut along the CC line in Figure 10. 【0064】 As shown in Figures 10 and 11, for example, the segment assembly apparatus SA according to this embodiment is configured such that the roller 84 of the rolling mechanism 8 according to the first embodiment is an electromagnetic roller 9 having an electromagnet built inside. That is, the rolling mechanism 8 according to this embodiment includes a support portion 85 connected to a first support member 81 and a second support member 82 to support the electromagnetic roller 9, a pair of first bearing portions 861 and second bearing portions 862 provided in pairs above and below the support portion 85, and an electromagnetic roller 9 rotatably supported by the first bearing portion 861 and the second bearing portion 862. 【0065】 The support portion 85 is integrally formed so that its vertical cross-section is generally U-shaped, and includes a connecting base portion 850 connected to the first support member 81 and the second support member 82, and a pair of first support portions 851 and second support portions 852 provided at the upper and lower ends of the connecting base portion 850, respectively, to support the first bearing portion 861 and the second bearing portion 862. The connecting base portion 850 is fitted onto the first support member 81 and the second support member 82 via cylindrical first connecting portions 853 and second connecting portions 854, which are provided in pairs vertically on the back surface (the side opposite to the first support portion 851 and the second support portion 852). 【0066】 The electromagnetic roller 9 includes an electromagnet 90 that generates a magnetic force when energized, and a cylindrical roller body 91 that is rotatably supported by a first bearing portion 861 and a second bearing portion 862 and houses the electromagnet 90 inside. Similar to the roller 84 according to the first embodiment, this electromagnetic roller 9 is provided so as to be able to roll on the end face of the transverse rib 15 of the first ring body 101. 【0067】 The electromagnet 90 includes a rotating shaft 92 which is an iron core rotatably supported in a first bearing section 861 and a second bearing section 862, a coil 93 which is spirally wound around the outer circumference of the rotating shaft 92, and a blocking ring 94 which is fitted onto the axial middle portion of the coil 93 and acts as a yoke to block the magnetic force generated on the outer circumference of the coil 93. 【0068】 The rotating shaft 92 is formed in a cylindrical shape from an iron-based metal material, and its upper and lower ends are rotatably supported by the first bearing portion 861 and the second bearing portion 862. The rotating shaft 92 is connected to the roller body 91 via a pair of first reinforcing members 971 and second reinforcing members 972, which are fitted onto the rotating shaft 92 and rotate integrally with it. The axial position of the rotating shaft 92 and the roller body 91 is fixed via a pair of fixing brackets 98, which are screwed to the pair of first reinforcing members 971 and second reinforcing members 972, respectively. 【0069】 The coil 93 is formed by uniformly winding an electric wire (for example, copper wire) around the outer circumference of the rotating shaft 92. Power is supplied to the coil 93 from a well-known brush 96 located at the upper end of the first support portion 851, via a well-known slip ring 95 that is rotatably mounted integrally with the rotating shaft 92 at the upper end of the rotating shaft 92. The slip ring 95 and the brush 96 are covered with, for example, a box-shaped cover 99, which protects them from water, dust, and the like. 【0070】 The shielding ring 94 is formed in an annular shape from a magnetic metal material such as iron, and functions as a yoke for the electromagnet 90. Together with the first roller component 911 and the second roller component 912, which will be described later, it constitutes the roller body 91. In other words, when the coil 93 is energized, the shielding ring 94 forms N and S magnetic poles at both ends in the axial direction, amplifying the magnetic force (attractive force) of the electromagnet 90. The shielding ring 94 is positioned in the axial direction opposite to the transverse rib 15 of the segment 11, making it possible to effectively apply the amplified magnetic force to the segment 11. 【0071】 The roller body 91 is formed in a hollow cylindrical shape with an internal housing space by a pair of upper and lower first roller components 911 and second roller components 912 that are divided in the axial middle portion, and a blocking ring 94 interposed between the first roller component 911 and the second roller component 912. Furthermore, the roller body 91 is set to have an axial length that is greater than or equal to the end face width of the transverse rib 15 of the first ring body 101, similar to the roller 84 according to the first embodiment. 【0072】 As described above, in this embodiment, when connecting the segments 11, the magnetic force generated between the axial ends of the shut-off ring 94 when the coil 93 is energized causes the segments 11 to be attracted to the electromagnetic roller 9, thereby fixing the inner scaffolding 6 to the segments 11. As a result, during the segment connection work of the segments 11, the electromagnetic roller 9 restricts the movement (swing) of the inner scaffolding 6 in the direction approaching the segments 11 (see arrow D1 in Figure 2), and also restricts the movement (swing) of the inner scaffolding 6 in the direction away from the segments 11 (see arrow D2 in Figure 2). 【0073】 (Effects of this embodiment) As described above, in this embodiment, the rolling mechanism 8 of the segment assembly device SA is composed of electromagnetic rollers 9. Therefore, when the first drive wheel 41 and the second drive wheel 42 are rotating, the electromagnetic rollers 9 roll over the transverse ribs 15 of the segment 11, allowing the inner scaffolding 6 to move smoothly. At the same time, when the first drive wheel 41 and the second drive wheel 42 are stopped, the magnetic force of the electromagnets 90 embedded in the electromagnetic rollers 9 can fix the inner scaffolding 6 to the segment 11. 【0074】 With this configuration, in this embodiment, when the first drive wheel 41 and the second drive wheel 42 are driven, the electromagnetic roller 9 rotates and the fixing state of the inner scaffolding 6 by the electromagnet 90 is released. Conversely, when the first drive wheel 41 and the second drive wheel 42 stop, the inner scaffolding 6 is automatically fixed to the segment 11 by the magnetic force of the electromagnet 90 as the electromagnetic roller 9 stops. This eliminates the need to fix the inner scaffolding 6 in conjunction with the stopping of the first drive wheel 41 and the second drive wheel 42, and to release the fixing of the inner scaffolding 6 in conjunction with the driving of the first drive wheel 41 and the second drive wheel 42, thereby reducing the workload associated with the movement of the inner scaffolding 6. 【0075】 Furthermore, because the electromagnet 90 is embedded inside the electromagnetic roller 9, the magnetic force of the electromagnet 90 can be applied even when the electromagnetic roller 9 is rotating. This makes it possible to roll the electromagnetic roller 9 along the transverse rib 15 of the segment 11 without separating the electromagnetic roller 9 from the transverse rib 15. As a result, not only when the inner scaffolding 6 is stopped, but also when the inner scaffolding 6 is moving in the circumferential direction, radial movement of the inner scaffolding 6, especially movement toward the side away from the segment 11 (see arrow D2 in Figure 2), can be suppressed, and stable movement of the inner scaffolding 6 can be ensured. 【0076】 Furthermore, in this embodiment, the axial width of the roller body 91 of the electromagnetic roller 9 is formed to be wider than the vertical width of the transverse rib 15 of the segment 11. Therefore, the wider roller body 91 ensures stable rolling of the roller body 91 on the transverse rib 15 of the segment 11, and it is not necessary to align the mounting position of the electromagnetic roller 9 with the height position of the transverse rib 15 of the segment 11, thereby improving the versatility of the segment assembly device SA. 【0077】 In addition to the wide configuration described above, the axial width of the roller body 91 of the electromagnetic roller 9 may be set to a relatively small width corresponding to the transverse ribs 15 of the segment 11. In this case, the electromagnetic roller 9 can be miniaturized, and the manufacturing cost of the segment assembly device SA can be reduced. 【0078】 Furthermore, in this embodiment, a portion of the roller body 91 of the electromagnetic roller 9 facing the transverse rib 15 of the segment 11 is composed of a blocking ring 94 that blocks the magnetic field lines of the coil 93. Therefore, the blocking ring 94 makes it possible to amplify the magnetic force (attractive force) of the electromagnet 90 when the coil 93 is energized. As a result, the relative movement of the electromagnetic roller 9 with respect to the segment 11 is firmly restricted, and the holding force of the inner scaffolding 6 can be improved. 【0079】 The present invention is not limited to the configurations exemplified in each of the above embodiments, and can be freely modified according to the specifications of the target application, etc., without departing from the spirit of the present invention. 【0080】 In particular, the mounting positions of the rollers 84 and electromagnetic rollers 9 that constitute the rolling mechanism 8 can be arbitrarily changed according to the specifications of the segment 11, such as the number of main girders of the segment 11, and can be set to the optimal position in accordance with the transverse ribs 15 of the segment 11 that constitute the rolling surface. [Explanation of symbols] 【0081】 1... Caisson structure 101... The first ring body 102...Second Ring Body 11...Segment 2…Press-fit girders 3... Rails 40…motor 41…First drive wheel (a pair of drive wheels) 42…Second drive wheel (a pair of drive wheels) 51…First support (a pair of support pillars) 52…Second support post (a pair of support posts) 6…Interior scaffolding 7...Guiding wheel 8…Rolling mechanism 84...Laura 9…Electromagnetic roller (fixing mechanism) 90... Electromagnet 91... Roller body (roller) 92... Rotating shaft (iron core) 93... Coil 94... Blocking ring MR…Fixing means SA... Segment Assembly Equipment

Claims

[Claim 1] A segment assembly device installed in a segment press-in device, which constructs a submerged structure by arranging segments suspended by a lifting machine in parallel in the circumferential direction on an annular first ring body formed by connecting multiple arc-shaped segments in the circumferential direction, and by connecting the segments to each other to assemble an annular second ring body, A rail is installed along the inner circumference of the press-fitting girder of the segment press-fitting device, A motor drives and controls the movement of at least one pair of drive wheels along the rail, A pair of support columns connected to the pair of drive wheels and suspended from the rail via the pair of drive wheels, An inner scaffolding, which is suspended from the pair of support columns and extends along the circumferential direction of the rail, is generally arc-shaped and A segment assembly apparatus characterized by being equipped with the following features. [Claim 2] A segment assembly apparatus according to claim 1, The pair of support columns are positioned at both ends of the inner scaffold in the circumferential direction, The circumferential ends of the inner scaffold are suspended and supported from the rail via the pair of drive wheels. A segment assembly apparatus characterized by the following: [Claim 3] A segment assembly apparatus according to claim 2, The system includes guide wheels provided between the circumferential directions of the pair of drive wheels, which roll along the rails in accordance with the pair of drive wheels, A segment assembly apparatus characterized by the following: [Claim 4] A segment assembly apparatus according to claim 1, The first ring body is equipped with a fixing means capable of fixing the inner scaffold when the pair of drive wheels are stopped. A segment assembly apparatus characterized by the following: [Claim 5] A segment assembly apparatus according to claim 4, The fixing means mechanically connects the inner scaffolding and the first ring body. A segment assembly apparatus characterized by the following: [Claim 6] A segment assembly apparatus according to claim 4, The aforementioned fixing means is A roller is provided on the side of the inner scaffolding so as to protrude toward the segment side, and rolls on the inner circumferential surface of the first ring body, An electromagnet embedded inside the roller, A segment assembly apparatus characterized by being equipped with the following features. [Claim 7] A segment assembly apparatus according to claim 6, The aforementioned segment is A peripheral wall provided on the outer perimeter, Multiple transverse ribs are provided so as to protrude from the inner circumference of the peripheral wall, spaced parallel to each other at predetermined intervals in the vertical direction of the peripheral wall, and extending along the circumferential direction of the peripheral wall, Multiple longitudinal ribs are provided so as to protrude from the inner circumference of the peripheral wall, spaced parallel to each other at predetermined intervals in the circumferential direction of the peripheral wall, and extending along the vertical direction of the peripheral wall to connect the transverse ribs, It has, The roller rolls along the inner end face of the transverse rib, A segment assembly apparatus characterized by the following: [Claim 8] A segment assembly apparatus according to claim 7, The roller is formed in a cylindrical shape having an axial length longer than the vertical width of the transverse rib, The aforementioned electromagnet is An iron core having a longer axial length than the roller and housed on the inner circumference side of the roller, The coil wound around the outer circumference of the aforementioned iron core, A shielding ring is placed over the outer circumference of the coil and constitutes a part of the roller, and when the coil is energized, it blocks the magnetic field of the coil, forming magnetic poles at both ends in the axial direction. Having, A segment assembly apparatus characterized by the following: [Claim 9] A segment assembly method for constructing the submerged structure by assembling the segments using the segment assembly apparatus described in any one of claims 1 to 8, The first step of assembling the first ring body, After the first step described above, a second step is performed in which excavation work is carried out, A third step is to assemble the second ring body by arranging a plurality of segments on the first ring body, A segment assembly method characterized by comprising the following features. [Claim 10] A segment assembly method according to claim 9, In the second step, when excavating directly beneath the inner scaffolding, the motor is driven to move the inner scaffolding in the circumferential direction, and then the excavation is performed. In the second step, when excavating an area other than directly beneath the inner scaffolding, the excavation is performed while maintaining the position of the inner scaffolding. A segment assembly method characterized by the following.

Images