Removal and connection methods

Abstract

To provide a removal method for efficiently removing vertical member parts in a state of a crane not sufficiently usable, and a connection method of efficiently connecting the vertical member parts.SOLUTION: A removal method comprises: a temporary connection step of temporarily connecting the lower end of an upper end H-steel 5P of an H-steel column 1 to the upper end of a lower H-steel 5Q continued to the lower part of the upper end H-steel 5P with a hinge member 9; a connection releasing step of releasing the connection of the upper end H-steel 5P with the lower H-steel 5Q except at the hinge member 9; a rotation step of rotating the upper end H-steel 5P around the hinge member 9; and a temporary connection releasing step of, after supporting the rotated upper end H-steel 5P by a carriage 27, releasing the temporary connection of the upper end H-steel 5P with the lower H-steel 5Q by the hinge member 9.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a removal method and a connection method. [Background technology]

[0002] A conventional technique in this field is the pile construction method described in Patent Document 1. This pile construction method includes a step of installing a core material of a pile in a hole excavated using a pile driver, in which divided core parts are sunk into the hole while adding more to the upper ends. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Public Disclosure No. 58-63241 Summary of the Invention [Problem to be solved by the invention]

[0004] When removing vertical members such as piles, for example, the vertical members are repeatedly pulled up and the aboveground portions protruding above ground are separated and removed. However, there are cases where cranes cannot be fully used at the work site due to reasons such as the inability of cranes to enter the work site or overhead restrictions. In such cases, for example, the portions to be removed must be divided into small pieces that can be handled by hand, which is inefficient. Similarly, when constructing vertical members, if cranes cannot be fully used, the vertical members to be added must be divided into small pieces, which is inefficient.

[0005] An object of the present invention is to provide a removal method for efficiently removing portions of vertical members in a situation where a crane cannot be fully used, and a connection method for efficiently connecting portions of vertical members. [Means for solving the problem]

[0006] The gist of the present invention is as follows.

[0007] [1] A removal method for removing a first part that forms part of a vertical member, comprising: a temporary connecting step of attaching a temporary connecting member that temporarily connects the lower end of the first part to the upper end of a second part that is connected below the first part; a disconnecting step of disconnecting the connection between the first part and the second part other than by the temporary connecting member; a rotating step of rotating the first part around the temporary connecting member; and a temporary disconnecting step of releasing the temporary connection between the first part and the second part by the temporary connecting member after the rotated first part is supported by a support means other than the temporary connecting member.

[0008] [2] The removal method described in [1], wherein the first part is the upper end of the vertical member, and in the rotation process, the rotated first part is laid sideways on a trolley serving as the support means prepared to the side of the second part, and in the temporary connection release process, the temporary connection is released while the first part is supported sideways on the trolley.

[0009] [3] The removal method described in [2] further includes a transporting step of transporting the cart on which the first part is placed in a horizontal position from the side of the second part after the temporary connection releasing step.

[0010] [4] A removal method described in any one of [1] to [3], further comprising an inclined support part installation process for installing an inclined support part for supporting the first part in an inclined state during rotation before the rotation process, wherein the inclined support part has a tension support part that can be extended and contracted to connect a predetermined support base point located away from the temporary connecting member in the opposite direction to the rotation direction of the first part and a part of the first part.

[0011] [5] The removal method described in any one of [1] to [4], wherein the temporary connecting member is a hinge member having a hinge portion that serves as a rotation center of the first part.

[0012] [6] A connecting method for connecting a first part that is part of a vertical member so that it is continuous above a second part of the vertical member, comprising: a carrying-in process for carrying a cart on which the first part is placed sideways to the side of the second part; a temporary connecting process for attaching a temporary connecting member that temporarily connects one end of the first part to the upper end of the second part; a rotating process for rotating the first part around the temporary connecting member and positioning the first part so that it is continuous above the second part; and a connecting process for connecting the first part and the second part at a point other than the temporary connecting member. [Effects of the Invention]

[0013] According to the present invention, it is possible to provide a removal method for efficiently removing parts of vertical members in a situation where a crane cannot be fully used, and a connection method for efficiently connecting parts of vertical members. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a cross-sectional view showing an example of a site including an H-shaped steel pillar to which the removal method of the first embodiment is applied. FIG. [Figure 2] 10(a) and 10(b) are cross-sectional views sequentially showing the state of the H-shaped steel pillar in the removal method of the first embodiment. [Figure 3] 3(a) and 3(b) are cross-sectional views showing the state of the H-shaped steel pillar in the removal method of the first embodiment in sequence following FIG. 2. [Figure 4] FIG. 10 is a cross-sectional view showing an example of a site including intermediate piles to which the removal method of the second embodiment is applied. [Figure 5] 10(a) and 10(b) are enlarged front views sequentially showing the state of the upper part of the intermediate pile in the removal method of the second embodiment. [Figure 6] 6(a) and 6(b) are enlarged front views showing the state of the upper part of the intermediate pile in the removal method of the second embodiment, following FIG. 5, in order. [Figure 7] 7(a) and 7(b) are front views showing the states of the intermediate piles in the removal method of the second embodiment in sequence, following FIG. 6. [Figure 8] 10(a) and 10(b) are front views sequentially showing the state of intermediate piles in other removal methods for comparison. [Figure 9] 10(a) and 10(b) are cross-sectional views sequentially showing the state of an H-shaped steel pillar in the connecting method of the third embodiment. [Figure 10] 10(a) and 10(b) are cross-sectional views showing the state of the H-shaped steel pillar in the connecting method of the third embodiment in sequence, following FIG. 9. [Figure 11] 10A and 10B are cross-sectional views showing the state of the H-shaped steel pillar in the removal method of the third embodiment. [Figure 12] FIG. 10 is an enlarged front view showing a temporary connection portion according to a modified example. [Figure 13] 10(a) to 10(c) are front views showing modified examples. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the removal method according to the present invention will be described in detail with reference to the drawings.

[0016] (First embodiment) FIG. 1 is a cross-sectional view showing an example of an H-beam steel pillar 1 to which the removal method of this embodiment is applied. In the following description, the vertical direction is referred to as the Z direction, the left-right direction in FIG. 1 as the X direction, and the depth direction in FIG. 1 as the Y direction. The H-beam steel pillar 1 is used as a support for a railroad track protection fence that separates a work yard from a railway track area. Although detailed illustration is omitted, in FIG. 1, the left side of the H-beam steel pillar 1 is the work yard, and the right side of the H-beam steel pillar 1 is the railway track area. A plurality of H-beam steel pillars 1 are arranged at a predetermined pitch in the Y direction along the boundary between the work yard and the railway track area. For example, single pipes (not shown) are strung between the H-beam steel pillars 1 in the Y direction, and a net (not shown) is stretched between the H-beam steel pillars 1 and the single pipes to construct a railroad track protection fence.

[0017] As shown in FIG. 1 , the H-steel pillar 1 is buried vertically in the ground G, and the upper end of the H-steel pillar 1 protrudes above ground by, for example, about 2.5 m. The H-steel pillar 1 is constructed by connecting a plurality of H-steel beams 5, each about 2 m long, in the longitudinal direction via splice plates 7. The uppermost connection portion 3 between the H-steel beams 5 is located above ground, and at this connection portion 3, the uppermost H-steel beam 5 of the H-steel pillar 1 (hereinafter referred to as the "upper end H-steel beam 5P") is connected to the portion below it.

[0018] The H-beam 5 has a web 5a perpendicular to the Y direction, a flange 5b facing the work yard, and a flange 5c facing the track area. Hereinafter, of the splice plates 7, those that vertically connect the webs 5a of the H-beam 5 to each other will be referred to as "splice plate 7a," those that vertically connect the flanges 5b of the H-beam 5 to each other will be referred to as "splice plate 7b," and those that vertically connect the flanges 5c of the H-beam 5 to each other will be referred to as "splice plate 7c." Note that to avoid cluttering the drawings, illustrations of bolts and the like that fasten the splice plates 7 are omitted.

[0019] The removal method of this embodiment is a method for removing a railway guardrail fence by first separating and removing the upper H-beam 5P (first portion) of the H-beam pillar 1 from the portion below it (second portion) after the single pipe and net have been removed. There is an overhead restriction at the work site for this removal work, and specifically, an obstacle 2 exists directly above the upper H-beam 5P. Because this overhead restriction prevents the use of a crane at the work site, the removal method of this embodiment is adopted as a method that barely requires the use of a crane. The removal method of this embodiment includes a temporary connection process, an inclined support section installation process, a connection release process, a rotation process, a temporary connection release process, and a carrying-out process, which are described below.

[0020] [Temporary connection process] First, in the temporary connection step, the lower end of the upper H-shaped steel 5P is temporarily connected to the upper end of the H-shaped steel 5 immediately below it (hereinafter referred to as the "lower H-shaped steel 5Q"). Specifically, as shown in FIG. 2(a), a hinge member 9 (temporary connection member) is attached so as to straddle the two flanges 5b, 5b of the connecting portion 3. In this embodiment, since the splice plate 7b interferes with the attachment of the hinge member 9, the splice plate 7b is removed and the hinge member 9 is attached. The hinge member 9 is attached to the two flanges 5b, 5b using metal fittings such as clamps. Alternatively, the hinge member 9 may be bolted to the flanges 5b, 5b using the bolt holes for the splice plate 7b.

[0021] The hinge member 9 has a steel plate portion 9p fixed to the flange 5b of the upper H-shaped steel beam 5P, a steel plate portion 9q fixed to the flange 5b of the lower H-shaped steel beam 5Q, and a hinge portion 11 that hinges together the steel plate portions 9p, 9q. The hinge portion 11 has a hinge axis extending in the Y direction. This hinge member 9 forms a temporary connection portion 10 that temporarily connects the upper H-shaped steel beam 5P and the lower H-shaped steel beam 5Q. In this temporary connection portion 10, the upper H-shaped steel beam 5P is temporarily connected to the lower H-shaped steel beam 5Q so that it can rotate around the hinge portion 11. However, at the time of this temporary connection process, the rotation of the upper H-shaped steel beam 5P is prevented by the presence of splice plates 7a and 7c.

[0022] [Slope support installation process] After the temporary connection process, the inclined support member 12 is installed in the inclined support member installation process. The inclined support member is intended to support the upper H-beam 5P in an inclined state during rotation in the rotation process described below. Specifically, as shown in FIG. 2(b), a support base member 13 extending in the X direction toward the track area is attached to the upper end of the flange 5c of the lower H-beam 5Q. In this embodiment, since the splice plate 7c interferes with the installation of the support base member 13, the splice plate 7c is removed and the support base member 13 is installed. The support base member 13 is attached to the flange 5c of the lower H-beam 5Q using metal fittings such as clamps. Alternatively, the support base member 13 may be bolted to the flange 5c using the bolt holes for the splice plate 7c.

[0023] The support base member 13 is composed of, for example, a steel plate 13a extending along substantially the entire Y-direction width of the flange 5c, and a steel plate 13b extending in the X-direction from the center of the steel plate 13a in the Y-direction, and is T-shaped in plan view. A wire connection portion 15 (support base point) for connecting a wire is formed on the tip side of the steel plate 13b. Furthermore, another wire connection portion 17 is formed on the flange 5c of the upper H-shaped steel 5P at a position relatively close to the upper end of the upper H-shaped steel 5P. These wire connection portions 15, 17 are composed of an appropriate combination of metal fittings such as clamps and shackles.

[0024] Furthermore, an extendable tension support unit 19 is attached to connect the wire connection unit 15 and the wire connection unit 17. The tension support unit 19 has a connecting wire unit 21, which is a rope connecting the wire connection units 15 and 17. The tension support unit 19 also has a telescopic operation device 23 attached midway along the connecting wire unit 21. The telescopic operation device 23 is a device that pulls in and feeds the wire of the connecting wire unit 21 by, for example, manually operating a lever, and is capable of extending or shortening the length of the tension support unit 19 stretched between the wire connection units 15 and 17. In other words, although the wire of the connecting wire unit 21 itself is hardly extendable, the combination of the connecting wire unit 21 and the telescopic operation device 23 forms the tension support unit 19, which appears to extend or shorten. The telescopic operation device 23 may be, for example, a device with a power-boosting mechanism using gears and pulleys, such as a lever block (registered trademark). The wire of the connecting wire unit 21 may also be replaced with a chain, or a combination of a wire and a chain may be used. The above-described support base member 13, wire connection portion 17, and tension support portion 19 constitute the inclined support portion 12.

[0025] [Uncoupling process] After the inclined support part installation process, in the connection release process, the connection between the upper H-shaped steel 5P and the lower H-shaped steel 5Q is released except at the temporary connection part 10. Specifically, the splice plate 7a that connected the webs 5a of the upper H-shaped steel 5P and the lower H-shaped steel 5Q is removed. As a result, as shown in Figure 2(b), the upper H-shaped steel 5P is supported only by the hinge member 9 at the temporary connection part 10 and the tension support part 19 at the inclined support part 12.

[0026] [Rotation process] After the above-mentioned disconnection process, in the rotation process, the upper H-beam 5P is rotated around the temporary coupling portion 10. Specifically, as shown in FIG. 2(b), a cart 27 is first prepared on the side of the lower H-beam 5Q on the work yard side. Then, as shown in FIG. 3(a), the upper H-beam 5P is rotated around the hinge portion 11 of the hinge member 9 so as to tilt it toward the work yard side. During this rotation, the inclined upper H-beam 5P is tensioned and supported by the tension support portion 19 of the inclined support portion 12. Then, the worker manually operates the lever of the extension / retraction operating device 23, gradually extending the tension support portion 19, and the upper H-beam 5P slowly rotates toward the work yard side. Finally, as shown in FIG. 3(b), the upper H-beam 5P is rotated approximately 90° and laid sideways onto the cart 27.

[0027] [Temporary connection release process] In the temporary connection releasing step, after the upper H-shaped steel 5P has been supported by the bogie 27 in the above-mentioned rotation step, the temporary connection between the upper H-shaped steel 5P and the lower H-shaped steel 5Q by the hinge members 9 is released. Specifically, as shown in FIG. 3(b), the hinge members 9 are removed from the upper H-shaped steel 5P and the lower H-shaped steel 5Q which are in a sideways position. In addition, the tension support members 19 of the inclined support members 12 are removed from the upper H-shaped steel 5P. In addition, the support base members 13 of the inclined support members 12 are also appropriately removed from the lower H-shaped steel 5Q.

[0028] [Export process] After the temporary connection release process, in the removal process, the trolley 27 carrying the upper H-beam 5P placed on its side leaves its position next to the lower H-beam 5Q, and the upper H-beam 5P is removed from the work site together with the trolley 27.

[0029] This completes the removal of the top H-beam 5P. After the top H-beam 5P has been removed, the remaining H-beam pillar 1 is pulled up approximately 2 m from the pile hole (not shown) using a jack or the like. Then, by exposing the next connecting portion 3 approximately 0.5 m above the pile hole, the remaining top H-beam 5 can be removed again using the removal method of this embodiment. By repeating this process of pulling up the remaining H-beam pillar 1 and removing the top H-beam 5 using the removal method of this embodiment, the entire H-beam pillar 1 can finally be removed.

[0030] According to the removal method of this embodiment as described above, it is possible to separate and remove the upper H-steel 5P of the H-steel pillar 1 at a work site where cranes cannot be fully used. Then, by repeating the process of lifting up the remaining H-steel pillar 1 and removing the uppermost H-steel 5 by the removal method of this embodiment, it is possible to finally remove the entire H-steel pillar 1.

[0031] (Second embodiment) A removal method according to a second embodiment of the present invention will be described. Components described in this embodiment that are the same as or equivalent to those in the first embodiment are designated by the same reference numerals in the drawings, and redundant description will be omitted. FIG. 4 is a cross-sectional view showing an example of a work site to which the removal method according to this embodiment is applied. In the following description, the vertical direction is the Z direction, the left-right direction in FIG. 4 is the X direction, and the depth direction in FIG. 4 is the Y direction. At this work site, an underground space is formed by a retaining wall 41, a base slab 42, a lining plate 43, a lining girder 45, and intermediate piles 47, and a skeleton 49 is constructed within this underground space. The intermediate piles 47, made of H-shaped steel, remain embedded in the skeleton 49, penetrating its top and bottom walls.

[0032] After the skeleton 49 is completed, the remaining intermediate piles 47, as described above, have their respective removal target portions 51 (portions extending from the floor to the ceiling inside the skeleton 49) removed from inside the skeleton 49. As described above, the intermediate piles 47 are made of H-beam steel. Therefore, the removal target portions 51 have a web 51a perpendicular to the Y direction, a flange 51b located on the left side in FIG. 4, and a flange 51c located on the right side in FIG. 4 (see FIG. 5(a)). In the removal method of this embodiment, the removal target portion 51 of the intermediate pile 47 is first removed from the portion closest to the ceiling 49p of the skeleton 49 (hereinafter referred to as the "top portion 51P"). The removed top portion 51P has a length of, for example, approximately 2 m. The removal method of this embodiment includes the following steps: an upper-end cutting process, a temporary connecting process, an inclined support installation process, a disconnecting process, a rotating process, a temporary connecting disconnecting process, and a carrying-out process.

[0033] [Top end cutting process] 5(a), in the upper end cutting step, the portion to be removed 51 is cut and separated into upper and lower parts at a cutting point 50 immediately adjacent to the upper end of the portion to be removed 51. The upper end of the portion to be removed 51 corresponds to the position where the ceiling 49p of the body 49 intersects with the intermediate pile 47. This cutting point 50 corresponds to the upper end of the uppermost part 51P. As a method for cutting the portion to be removed 51, for example, thermal cutting such as gas cutting is adopted.

[0034] [Temporary connection process] After the upper-end cutting process, in the temporary connecting process, the lower end of the uppermost part 51P to be removed is temporarily connected to the upper end of the lower part of the portion 51 to be removed (hereinafter referred to as the "lower part 51Q") immediately below it. At the time of this temporary connecting process, the uppermost part 51P and the lower part 51Q are continuous as a single H-beam. Specifically, in this temporary connecting process, as shown in FIG. 5(a), the hinge member 9 is attached to the flange 51b so as to straddle the position (hereinafter referred to as the "planned boundary position 52") that is planned to be the boundary between the uppermost part 51P and the lower part 51Q. The planned boundary position 52 is set, for example, at a position approximately 2 m below the ceiling 49p. The hinge axis of the hinge portion 11 of the attached hinge member 9 is oriented in the Y direction, and the hinge portion 11 is located at the same height as the planned boundary position 52.

[0035] [Slope support installation process] After the temporary connection step, as shown in FIG. 5(b), the inclined support portion 12 is installed in the inclined support portion installation step. As described in the first embodiment, the inclined support portion 12 is configured by the support base member 13, the wire connection portion 17, and the tensile support portion 19. The support base member 13 is attached to the flange 51c at a position slightly below the planned boundary position 52 and extends in the X direction. The wire connection portion 17 is attached to the flange 51c at a position above the planned boundary position 52 and relatively close to the ceiling 49p. The tensile support portion 19 connects the wire connection portion 17 to the wire connection portion 15 of the support base member 13.

[0036] [Uncoupling process] After the inclined support portion installation step, the connection between the uppermost portion 51P and the lower portion 51Q is released except for the hinge member 9 in the connection release step. Specifically, the portion to be removed 51 is cut at the planned boundary position 52, and the uppermost portion 51P is separated from the lower portion 51Q. This cutting method may be the same as that in the upper end cutting step described above. As shown in FIG. 5(b), the uppermost portion 51P is now supported only by the hinge member 9 in the temporary connecting portion 10 and the tensile support portion 19 in the inclined support portion 12.

[0037] [Rotation process] After the above-described disconnection step, in the rotation step, the uppermost part 51P is rotated around the temporary coupling part 10. Specifically, as shown in FIG. 6(a), as in the first embodiment, the rotating uppermost part 51P is supported by the inclined support part 12, and the lever of the telescopic operating device 23 is operated to slowly rotate the uppermost part 51P to the left in FIG. 6(a) around the hinge part 11 of the hinge member 9. Finally, as shown in FIG. 6(b), the uppermost part 51P rotates approximately 180°, and the uppermost part 51P hangs down to the side of the lower part 51Q via the hinge member 9. In addition, the tension support part 19 of the inclined support part 12 is removed from the uppermost part 51P. In addition, the support base member 13 of the inclined support part 12 is also appropriately removed from the lower part 51Q.

[0038] [Temporary connection release process] In the temporary connection releasing step, after the top part 51P is supported by support means other than the hinge members 9, the temporary connection between the top part 51P and the lower part 51Q by the hinge members 9 is released. Specifically, as shown in FIG. 7(a), a mobile crane 55 is introduced into the frame 49 as the support means. Here, since there is a gap between the top part 51P and the ceiling 49p that is approximately the length of the top part 51P, it is possible to insert the boom 55a of the crane 55 above this top part 51P. Then, the wire of the crane 55 is sling-hooked to the upper end of the top part 51P, and after the weight of the top part 51P is supported by the crane 55 (support means), the hinge members 9 are removed from the top part 51P and the lower part 51Q. The top part 51P is now suspended from the crane 55.

[0039] [Export process] After the temporary connection releasing step, in the carrying-out step, as shown in FIG. 7(b), the top part 51P is lowered by the crane 55 and appropriately carried out from the work site.

[0040] This completes the removal of the uppermost portion 51P. After the uppermost portion 51P has been removed as described above, the boom 55a of the crane 55 can be inserted into the space between the remaining portion to be removed 51 and the ceiling 49p. Therefore, by repeating the process of cutting the upper end of the portion to be removed 51 and hoisting and lowering the upper end by the crane 55, the entire portion to be removed 51 can finally be removed.

[0041] Next, the effects of the removal method of this embodiment as described above will be explained. According to the removal method of this embodiment, even when a crane cannot be used sufficiently due to the overhead restriction imposed by the ceiling 49p, the uppermost portion 51P of the removal target portion 51 of the intermediate pile 47 can be separated and removed.

[0042] For comparison, FIG. 8 shows another removal method different from the removal method of this embodiment. In this removal method, as shown in FIG. 8(a), a wire from a crane 55 is sling-hooked onto a position of part 51 to be removed at a height where slinging is possible (for example, a position about 2 m below ceiling 49p). The slinging position is indicated by reference numeral 57 in the figure. Part 51 to be removed is then cut at cutting point 50 closest to ceiling 49p, and then cut at cutting point 52 below the slinging position (for example, a position about 4 m below ceiling 49p), and an uppermost portion 51P is excised. The excised uppermost portion 51P is suspended from crane 55, and is then lowered by crane 55 and carried out of the work site.

[0043] In the removal method of FIG. 8 , the boom 55a of the crane 55 cannot be inserted vertically above the top part 51P to be removed, so the slinging position 57 must be set at a position offset from vertically below the tip of the boom 55a of the crane 55. Furthermore, the slinging position 57 cannot be set at the top end of the top part 51P. As a result, as shown in FIG. 8( b), immediately after the top part 51P is cut from the intermediate pile 47 by cutting the cutting portions 50 and 52, the top part 51P suspended at the slinging position 57 may move suddenly, which increases the burden of safety measures for the work. In contrast, in the removal method of this embodiment, the top part 51P is supported by the hinge members 9 and the inclined support members 12 attached in advance, so sudden movement of the top part 51P immediately after it is cut is prevented. Furthermore, after the top part 51P has rotated approximately 180°, as shown in Figure 7(a), the boom 55a of the crane 55 can be inserted directly above the top part 51P, making it possible to sling the upper end of the top part 51P at a position vertically below the tip of the boom 55a. Therefore, in the temporary connection release step, even immediately after the hinge member 9 is detached, the top part 51P is suspended stably and sudden movement of the top part 51P is unlikely to occur.

[0044] (Third embodiment) A connecting method according to a third embodiment of the present invention will be described. The connecting method of this embodiment is a method for connecting the upper H-beam 5P so that it is continuous above the lower H-beam 5Q in construction work to install the H-beam steel column 1 according to the first embodiment under the same headroom restriction as in the first embodiment. Before the connecting method of this embodiment is carried out, as shown in FIG. 9(a), the lower H-beam 5Q is inserted into a pile hole (not shown) formed in the ground G, and, for example, about 0.5 m of the upper end of the lower H-beam 5Q protrudes upward from the pile hole. The connecting method of this embodiment is generally carried out in the reverse order of the removal method of the first embodiment, and includes a carrying-in process, a temporary connecting process, an inclined support part installation process, a rotation process, a connecting process, and a temporary connecting release process, which will be described below.

[0045] [Delivery process] 9(a), in the carrying-in process, a carriage 27 on which the upper H-shaped steel beam 5P is placed is carried in beside the lower H-shaped steel beam 5Q. At this time, the upper H-shaped steel beam 5P is placed on the carriage 27 with its flange 5c facing upward.

[0046] [Temporary connection process] After the above-mentioned carrying-in process, in the temporary connection process, one end of the upper H-shaped steel 5P on the carriage 27 and the upper end of the lower H-shaped steel 5Q are temporarily connected by the hinge member 9. Here, as shown in Figure 9(b), the position of the carriage 27 is adjusted to adjust the position of the upper H-shaped steel 5P, and then the steel plate portion 9p of the hinge member 9 is fixed to the flange 5b of the upper H-shaped steel 5P, and the steel plate portion 9q of the hinge member 9 is fixed to the flange 5b of the lower H-shaped steel 5Q.

[0047] [Slope support installation process] After the temporary connection step, in the inclined support part installation step, the inclined support part 12 is installed. Specifically, as shown in FIG. 10(a), as in the first embodiment, a support base member 13 that protrudes in the X direction toward the track area is attached to the upper end of the flange 5c of the lower H-shaped steel 5Q. Furthermore, a wire connection part 17 is formed on the flange 5c of the upper H-shaped steel 5P at a position on the upper H-shaped steel 5P that is relatively far from the hinge member 9. Furthermore, a tensile support part 19 is attached so as to connect this wire connection part 17 to the wire connection part 15 of the support base member 13.

[0048] [Rotation process] After the inclined support part installation process, in the rotation process, the upper H-beam 5P is rotated around the hinge member 9, and the upper H-beam 5P is positioned above the lower H-beam 5Q so as to be continuous with it. Specifically, as shown in FIG. 10(b), while the rotating upper H-beam 5P is supported by the inclined support part 12, an operator manually operates the lever of the telescopic operating device 23. The lever operation gradually shortens the tension support part 19, and the tension support part 19 slowly pulls the wire connection part 17 to the right in FIG. 10(b). As a result, the upper H-beam 5P slowly rotates upright around the hinge part 11 of the hinge member 9. Finally, as shown in FIG. 11(a), the upper H-beam 5P rotates approximately 90°, and the upper H-beam 5P is positioned above the lower H-beam 5Q so as to be continuous with it.

[0049] [Connection process] After the pivoting step, in the connecting step, the upper H-shaped steel 5P and the lower H-shaped steel 5Q are connected at locations other than the temporary connecting portion 10 formed by the hinge member 9. Specifically, as shown in FIG. 11(a), a splice plate 7a is attached that connects the web 5a of the upper H-shaped steel 5P to the web 5a of the lower H-shaped steel 5Q. Furthermore, the support base member 13 of the inclined support portion 12 is removed from the flange 5c of the lower H-shaped steel 5Q, and a splice plate 7c is attached that connects the flange 5c of the upper H-shaped steel 5P to the flange 5c of the lower H-shaped steel 5Q. Furthermore, the wire connection portion 17 and the tension support portion 19 of the inclined support portion 12 are also removed from the upper H-shaped steel 5P.

[0050] [Temporary connection release process] After the above connecting step, in the temporary connection releasing step, as shown in Figure 11(b), the hinge members 9 are removed and the temporary connection between the upper H-shaped steel 5P and the lower H-shaped steel 5Q is released. Then, splice plates 7b are attached in place of the hinge members 9, connecting the flanges 5b of the upper H-shaped steel 5P and the flanges 5b of the lower H-shaped steel 5Q. This completes the permanent connection between the upper H-shaped steel 5P and the lower H-shaped steel 5Q using the splice plates 7a, 7b, and 7c, completing the connection of the upper H-shaped steel 5P.

[0051] After the upper-end H-steel 5P has been connected in this manner, the H-steel pillar 1 including the upper-end H-steel 5P is inserted downward into the pile hole while being supported by a jack or the like, so that the upper end of the H-steel pillar 1 protrudes upward, for example, by about 0.5 m. Thereafter, by using the connecting method of this embodiment, other H-steel pillars 5 can be connected so as to be connected further upward to this H-steel pillar 1. By repeating this process of inserting H-steel pillars 1 into pile holes and connecting H-steel pillars 5 using the connecting method of this embodiment, it is possible to finally install an H-steel pillar 1 of the required length in the ground G.

[0052] The connecting method of this embodiment, as described above, allows the upper end H-steel 5P of the H-steel column 1 to be connected at a work site where cranes are not fully available. If the H-steel column 1 were to be installed in the ground G by repeatedly hoisting the H-steel 5 with a crane and connecting it to the top of the H-steel column 1, a space for inserting the crane's boom would need to be left between the obstacle 2 ( FIG. 1 ) and the H-steel 5, forcing the H-steel 5 suspended below the space to be short. This would require multiple connections of short H-steel 5, resulting in poor efficiency. In contrast, the connecting method of this embodiment allows a relatively long H-steel 5 to be connected to the upper end of the H-steel column 1 within a range that does not interfere with the obstacle 2, thereby reducing the number of times the H-steel 5 is connected, resulting in improved efficiency. The connecting method of this embodiment is not limited to the installation of columns such as the H-steel column 1, but can also be similarly applied to, for example, the installation of core materials for cast-in-place piles.

[0053] The present invention can be implemented in various forms, including the above-described embodiment, with various modifications and improvements based on the knowledge of those skilled in the art. It is also possible to configure modified examples by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be used in appropriate combination.

[0054] For example, in the first embodiment, the temporary connecting member that temporarily connects the upper H-shaped steel 5P and the lower H-shaped steel 5Q is not limited to the hinge member 9. Various members can be used as long as they temporarily connect the upper H-shaped steel 5P to the lower H-shaped steel 5Q in a rotatable manner. As an example, a connecting member 29 as shown in FIG. 12 may be used instead of the hinge member 9. FIG. 12 is an enlarged front view of a temporary connecting portion 10 according to a modified example. In the temporary connecting portion 10 of this modified example, a through hole 31 is provided at the lower end of the flange 5b of the upper H-shaped steel 5P, penetrating the flange 5b in the thickness direction (X direction). A similar through hole 33 is also provided at the upper end of the flange 5b of the lower H-shaped steel 5Q. The connecting member 29 is an annular member, and the flange 5b of the upper H-shaped steel 5P and the flange 5b of the lower H-shaped steel 5Q are temporarily connected by inserting the connecting member 29 into the through hole 31 and the through hole 33. The connecting member 29 may be formed of, for example, a cable tie, wire, or clamp material. Furthermore, bolt holes for the splice plate 7b may be utilized as the through holes 31, 33. Furthermore, the connecting member 29 is not limited to being annular, and may be a C-shaped member as long as it can guide the rotating upper H-shaped steel 5P. By providing multiple sets of such through holes 31, 33 and connecting member 29 in the Y direction (the depth direction of the paper in FIG. 12), the upper H-shaped steel 5P is temporarily connected to the lower H-shaped steel 5Q so that it can rotate. Similarly, the hinge member 9 in the second and third embodiments can also be changed to the above-described connecting member 29.

[0055] Furthermore, for example, in the temporary connection releasing step ( FIG. 3( b), etc.) in the first embodiment, to facilitate the removal of the hinge member 9, it is preferable that the force acting on the hinge member 9 due to the weight of the upper H-shaped steel 5P be small. That is, in the temporary connection releasing step, it is preferable that almost the entire weight of the upper H-shaped steel 5P be supported by the carriage 27. For this reason, in the rotation step ( FIGS. 3( a), 3( b), etc.), it is preferable that the upper H-shaped steel 5P be placed on the carriage 27 in a state rotated exactly 90°. To achieve this state, as shown in FIG. 13( a), a platform 27a for adjusting the height of a mounting surface 28 on which the upper H-shaped steel 5P is placed may be installed on the carriage 27. In this case, the dimensions of the platform 27a are adjusted in advance so that the height of the mounting surface 28 (the upper surface of the platform 27a) is the same as the height of the hinge portion 11 of the hinge member 9. Furthermore, a jack capable of raising and lowering the placement surface 28 with the upper-end H-beam 5P placed thereon may be installed in place of the platform 27a. For the same reason, a similar platform 27a or jack may also be installed on the carriage 27 in the third embodiment.

[0056] Furthermore, in the temporary connection release step in the first embodiment (FIG. 3(b), etc.), the hinge member 9 is removed after the upper H-shaped steel 5P is rotated and supported by the carriage 27, but this is not limited to this. After the upper H-shaped steel 5P is rotated and laid on its side, if there is a gap between the upper H-shaped steel 5P and the obstacle 2 large enough to allow the boom of a mobile crane to be inserted, the laid upper H-shaped steel 5P may be supported by a crane instead of being supported by the carriage 27. Then, the hinge member 9 may be removed while the upper H-shaped steel 5P is supported by the crane (support means), and then the upper H-shaped steel 5P, separated from the lower H-shaped steel 5Q, may be placed on the carriage 27 by operating the crane.

[0057] Furthermore, in the inclined support member 12 of the first embodiment (e.g., FIG. 3(a)), the wire connection portion 15 of the support base member 13 may be positioned even higher so that the tensile force of the tensile support portion 19 can be efficiently applied to the rotating upper H-shaped steel beam 5P. For example, the wire connection portion 15 is preferably positioned higher than the wire connection portion 17 when the upper H-shaped steel beam 5P is rotated 90°. As a specific example, as shown in FIG. 13(b), the tip of the support base member 13 may be bent upward into an L-shape, and the wire connection portion 15 may be positioned near the upper end of the bent portion. Alternatively, as shown in FIG. 13(c), the wire connection portion 15 may be provided on a structure 61 other than the lower H-shaped steel beam 5Q. Similarly, in the second and third embodiments, an L-shaped support base member 13 as shown in FIG. 13(b) may be employed, and the wire connection portion 15 may be provided on a structure 61 other than the lower H-shaped steel beam 5Q or the lower portion 51Q. Furthermore, the other structure 61 (FIG. 13(c)) in the second embodiment may be the retaining wall 41 (FIG. 4) or the skeleton 49 (FIG. 4). Furthermore, in the first to third embodiments, the wire connection portion 15 may be sequentially switched to a position where the tensile force of the tension support portion 19 acts efficiently, depending on the posture of the upper end H-beam 5P or the uppermost portion 51P during rotation.

[0058] In the first embodiment, the decoupling step involves removing the splice plate 7a connecting the upper H-shaped steel 5P and the lower H-shaped steel 5Q to decouple the upper H-shaped steel 5P and the lower H-shaped steel 5Q. Alternatively, the decoupling step may involve separating and decoupling the upper H-shaped steel 5P and the lower H-shaped steel 5Q by thermal cutting or the like. In the second embodiment, the decoupling step involves separating and decoupling the uppermost section 51P and the lower section 51Q by thermal cutting or the like. Alternatively, the decoupling step may involve removing the splice plate connecting the uppermost section 51P and the lower section 51Q to decouple the uppermost section 51P and the lower section 51Q. Furthermore, in the first embodiment, the upper H-shaped steel 5P may be rotated toward the track area (the right side in FIG. 1, etc.). In this case, a trolley prepared on the track may be used instead of the bogie 27. The present invention is not limited to supports such as H-shaped steel posts and intermediate piles of a track guardrail, but may be applicable to various vertical members. [Explanation of symbols]

[0059] 1...H-steel support (vertical member), 5P...upper H-steel (first part), 5Q...lower H-steel (second part), 9...hinge member (temporary connecting member), 11...hinge section, 10...temporary connecting section, 12...inclined support section, 15...wire connection section (support base point), 17...wire connection section, 19...tensile support section, 27...cart (support means), 29...connecting member, 47...intermediate pile (vertical member), 51P...top section (first part), 51Q...lower section (second part).

Claims

1. A removal method for removing a first portion that forms a part of a vertical member, comprising: a temporary connecting step of attaching a temporary connecting member that temporarily connects a lower end of the first portion and an upper end of a second portion that is continuous below the first portion; a disconnecting step of disconnecting the first portion and the second portion other than at the temporary connecting member; a rotating step of rotating the first portion around the temporary connecting member; a temporary connection releasing step of releasing the temporary connection between the first part and the second part by the temporary connecting member after the rotated first part is supported by a supporting means other than the temporary connecting member; Equipped with the temporary connecting member has a plate-shaped first fixing portion fixed to the first portion, a plate-shaped second fixing portion fixed to the second portion, and a hinge portion that hinges the first fixing portion and the second fixing portion and serves as a rotation center of the first portion in the rotation step, the first fixing portion, the second fixing portion, and the hinge portion are located along a surface of the vertical member on a side in a rotation direction of the first portion in the rotation process, The hinge portion is disposed at the same height as the boundary between the first portion and the second portion. Removal method.

2. the first portion is an upper end of the vertical member; In the rotating step, the rotated first portion is laid down on a carriage as the support means provided at a side of the second portion, The removal method according to claim 1 , wherein in the temporary coupling releasing step, the temporary coupling is released in a state in which the first portion is supported on the carriage in a sideways position.

3. The removal method according to claim 2 , further comprising, after the temporary coupling releasing step, a carrying-out step of carrying out the carriage on which the first portion is placed in the sideways position from a side of the second portion.

4. a tilt support part setting step of setting a tilt support part for supporting the first part in an inclined state during rotation before the rotating step, The inclined support portion is A predetermined support base point located away from the temporary connecting member in the opposite direction to the rotation direction of the first part and a part of the first part are connected to each other. A removal method according to any one of claims 1 to 3, which has an expandable tension support part that connects the first part to a predetermined support base point located away from the temporary connecting member in the opposite direction to the rotation direction of the first part.

5. A connecting method for connecting a first portion that is a part of a vertical member so as to be continuous above a second portion of the vertical member, comprising: a carrying-in process of carrying a cart on which the first portion is placed sideways to the side of the second portion; a temporary connecting step of attaching a temporary connecting member that temporarily connects one end of the first portion and an upper end of the second portion; a rotating step of rotating the first portion around the temporary connecting member and arranging the first portion so as to be continuous with the second portion above; a connecting step of connecting the first portion and the second portion other than the temporary connecting member; Equipped with the temporary connecting member has a plate-shaped first fixing portion fixed to the first portion, a plate-shaped second fixing portion fixed to the second portion, and a hinge portion that hinges the first fixing portion and the second fixing portion and serves as a rotation center of the first portion in the rotation step, the first fixing portion, the second fixing portion, and the hinge portion are located along a surface of the vertical member opposite to a surface on a side in a rotation direction of the first portion in the rotation step, The hinge portion is disposed at the same height as the boundary between the first portion and the second portion. Connection method.

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