JP5600780B1 - Steel plate winding method for columnar structures - Google Patents

Abstract

An object of the present invention is to provide a seismic reinforcement by winding a steel plate around a columnar structure even when the periphery is narrow.
A steel plate block 31 is brought to a working height at which a worker performs a winding operation when a steel plate connection body 3 in which steel plate blocks 31 are connected in a circumferential direction is connected in multiple stages around a columnar structure. Then, the first-stage steel plate connection body 3 formed in the first-stage formation step and the first-stage steel plate connection body 3 formed in the first-stage formation process are formed by joining the steel plate blocks 31 in the circumferential direction to form an annular shape. The steel plate block 31 is newly carried to the work height released by raising, and the steel plate block 31 is joined in the circumferential direction to form a second-stage steel plate coupling body 3 to form an annular shape. A second stage forming step of joining the upper end of the connection body 3 to the lower end of the first stage steel plate connection body 31.
[Selection] Figure 19

Description

  The present invention relates to a method for winding up a steel sheet of a columnar structure in which a steel sheet is wound around a columnar structure such as a pier of a bridge in a railway, a road, or the like and is seismically reinforced.

  2. Description of the Related Art Conventionally, as an earthquake countermeasure for columnar structures such as bridge piers in railways and roads, a method has been proposed in which a steel plate is wound around the columnar structure and seismic strengthened. In this method, the columnar structure is reinforced by forming a so-called rolled steel plate by surrounding it with a steel plate (see, for example, Patent Document 1).

  In the conventional method of winding a steel plate of a columnar structure, a steel plate is wound up sequentially from the lower stage around the columnar structure 9 as shown in FIG. Actually, the steel plate connectors 100 in which the steel plate blocks 92 are connected in the circumferential direction are sequentially stacked from the foundation of the columnar structure 9. These operations use a heavy machine 91 such as a crane truck and the like, and the work is performed while the steel plate block 92 is suspended through a hook 94 by this heavy machine. It is set as the structure which divided | segmented the cyclic | annular steel plate coupling body 100 connected with the circumferential direction, and it can mutually join by welding etc. FIG.

  In the joining work of the steel plate blocks at the ground level, the worker performs the steel plate block 92 suspended by the heavy machinery 91 on the ground 93. However, when stacking the steel plate connectors 100 above the ground, the scaffold 96 is installed on the ground 93 as shown in FIG. Then, the steel plate block 92 is lifted to the height of the scaffold 96 by the heavy machine 91, and the worker climbs the scaffold 96 to perform the work, and joins the steel plate block 92 to the lower steel plate connector 100 by welding.

  Further, when the steel plate connector 100 is further stacked at the upper end, the scaffold 96 is further assembled to the upper stage as shown in FIG. 26 (a), and the steel plate block 92 is lifted by the heavy machine 91, and this is moved to the lower steel sheet. Joined to the connector 100. These constructions are repeated until reaching the top level.

  Finally, as shown in FIG. 26 (b), after assembling the steel plate block 92 positioned at the uppermost stage, the steel plate connector 100 is firmly fixed to the columnar structure 9 with post-installed anchor bolts. The gap between the steel plate connector 100 and the columnar structure 9 is filled with a filler such as mortar (not shown).

JP-A-9-184303

  In the conventional construction method described above, it is essential to assemble a scaffold 96 around the columnar structure 9 when actually performing construction. In addition to this, it is necessary to carry out the construction by bringing the heavy machinery 91 close to the columnar structure 9.

  However, when there are obstacles such as buildings around the columnar structure 9, the work space around the columnar structure 9 becomes narrow, and a scaffold 96 is installed around the columnar structure 9. In addition, it becomes difficult to operate the heavy equipment 91 close to the columnar structure 9.

  Furthermore, conventionally, the steel plate coupling body 100 is often constituted by a steel plate block 92 divided into two parts, and in particular, the cross-sectional L-shaped shape of the steel plate coupling body 100 having a rectangular cross section, which is divided at diagonal points with each other, or long. It is often composed of a U-shaped cross section divided at the center of the side. Such a large steel plate block 92 has a problem that it is difficult to carry the steel plate block 92 into the installation position particularly when the periphery of the columnar structure is narrow.

  Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to make it possible to reinforce earthquake resistance by winding a steel plate around a columnar structure even when the periphery is narrow. It is providing the steel plate winding method of a columnar structure.

The method of winding a steel sheet of a columnar structure according to claim 1 is a method for winding a steel sheet of a columnar structure in which a steel plate connection body in which steel plate blocks are connected in a circumferential direction is connected to the periphery of the columnar structure in multiple stages. A first-stage forming step of bringing the steel plate block into a working height at which a worker performs a winding operation and joining the steel plate block in the circumferential direction to form an annular first-stage steel plate connection; newly the steel sheet blocks the first stage of the steel coupling body formed in stage forming process has been the working height freed by raising the hanging device mounted to the upper end of the columnar structure, the 1 A second-stage steel plate connection body that is carried while being suspended at the lower end of a small chain block other than the above-described suspension device attached to the stage steel plate connection body and joined in the circumferential direction to form an annular shape. Forming the second stage In the second-stage forming step of joining the upper end of the plate connection body to the lower side of the first-stage steel plate connection body, and the third-stage steel plate connection body and the subsequent steps, The steel plate block is newly suspended at the lower end of the small chain block attached to the steel plate coupling body located immediately above the work height released by being lifted by the lifting device, and the steel plate The block is joined in the circumferential direction to form an annular steel plate connector, and the upper end of the block is further joined to the lower end of the upper steel plate connector.

  The method for winding a steel sheet of a columnar structure according to claim 2 is the invention according to claim 1, further comprising a filling step of filling a filler into a gap between the steel plate connector joined vertically and the columnar structure. It is characterized by having.

  A steel sheet winding method for a columnar structure according to a third aspect of the present invention is characterized in that the steel sheet block is carried into the work height with reference to the ground or the vicinity of the ground.

  A columnar structure according to a fourth aspect is characterized in that a steel plate connection body is wound around the columnar structure by the method for winding a steel sheet according to any one of the first to third aspects.

  According to the steel sheet winding method for a columnar structure to which the present invention having the above-described configuration is applied, the first-stage steel plate connector formed in the upper stage is raised. Thereby, the steel plate block is newly carried in at the opened work height, and the steel plate block is joined in the circumferential direction to form a second-stage steel plate connection body. And the lower end of the 1st stage steel plate coupling body in the upper stage and the upper end of the 2nd stage steel plate coupling body are joined. Then, the working height is newly set to form the third and subsequent steel plate assemblies formed by raising the joined first steel plate connector and the second steel plate connector. Open and repeat these operations.

  For this reason, according to the present invention, it is possible for the worker to always perform the winding work of the steel sheet at the same work height, and it is possible to improve the work efficiency. In the present invention in which joining work can always be performed at the same work height, there is no need to separately install a scaffold around the columnar structure for joining the steel plate connectors. In addition to this, in the present invention, it is not necessary to carry out construction by bringing the heavy machinery close to the columnar structure. For this reason, when the building is located around the columnar structure, the work space around the columnar structure is narrowed. However, in the present invention, only the suspension device is installed even in such a case. Construction is possible even if the work space is narrow if space can be secured.

It is a figure which shows the columnar structure used as the object of the steel plate winding method to which this invention is applied. It is a flowchart of the steel plate winding method of the columnar structure to which the present invention is applied. It is a figure for demonstrating the structure of the suspension apparatus attached in the upper end vicinity of a columnar structure. It is a figure for demonstrating the winding method of the steel plate in the underground part of a columnar structure. It is another figure for demonstrating the winding method of the steel plate in the underground part of a columnar structure. It is a perspective view of the steel plate coupling object for winding up a columnar structure in a ground part. It is a top view of the steel plate coupling body for winding up a columnar structure in a ground part. (A) is a figure which shows the steel plate block of a cross-section L shape in case a steel plate coupling body is rectangular shape, (a) shows the flat steel plate block in the case where a steel plate coupling body is rectangular shape. FIG. It is a figure which shows the example which performs temporary assembly by welding the mutually adjacent steel plate block. It is a figure which shows the example which repeatedly performs carrying-in and temporary fixing of a steel plate block. It is a figure for demonstrating the case where steel plate blocks are joined by welding. It is a figure which shows the example which welds easily by making it incline about the edge part of a steel plate block. It is a figure for demonstrating in detail the construction method of a 2nd step formation process. It is a perspective view for demonstrating in detail the construction method of a 2nd step | paragraph formation process. It is another perspective view for demonstrating in detail the construction method of a 2nd step formation process. It is a figure for demonstrating in detail the construction method of a 2nd step formation process. It is a figure which shows the example which joins the 1st-stage steel plate coupling body and the 2nd-stage steel plate coupling body. It is a figure which shows the example which welds the 1st-stage steel plate coupling body and the 2nd-stage steel plate coupling body. It is another figure for demonstrating in detail the construction method of a 2nd step | paragraph formation process. It is a figure for demonstrating a 2nd step formation process and a mortar filling process. It is a figure for demonstrating the example which temporarily fixes a steel plate block using a post-construction anchor bolt with respect to a columnar structure. It is a perspective view for demonstrating the example which temporarily fixes a steel plate block with respect to a columnar structure using a post-construction anchor bolt. It is a figure which shows the example which arrange | positions a volt | bolt separately as a protrusion made to protrude toward a columnar structure from a steel plate block. It is a figure which shows the example which provides the steel plate coupling body diameter-reduced toward the upper side corresponding to the columnar structure by which diameter reduction was carried out. It is a figure for demonstrating the steel plate winding method of the columnar structure in the past. It is a figure for demonstrating the problem of the steel plate winding method of the columnar structure in the past.

  Hereinafter, as an embodiment of the present invention, a steel sheet winding method for a columnar structure will be described in detail with reference to the drawings.

  The method for winding a steel plate of a columnar structure to which the present invention is applied is a method in which a steel plate is wound around an existing columnar structure 1 as shown in FIG. This columnar structure 1 constitutes a pier of a bridge in a railway or a road. The columnar structure 1 is configured to have a rectangular cross section, but is not limited to this, and can correspond to any cross sectional shape including a circular cross section. A base portion 1 a of the columnar structure 1 is embedded in the ground 2. In the present invention, at least a portion above the ground 2 (hereinafter referred to as a ground portion) of such a columnar structure 1 is reinforced by winding a steel plate, but a portion below the ground 2 ( Hereinafter, a steel plate may be wound up for the underground portion).

  A building 10 such as a house has already been built around the columnar structure 1. For this reason, when the space | interval formed between the columnar structure 1 and the building 10 is narrow, the work space W for performing the winding work of a steel plate will inevitably become narrow, and a crane car etc. It becomes difficult to perform the winding work by bringing the heavy machinery in close proximity. In the steel sheet winding method to which the present invention is applied, even if such a work space W is narrow, winding of the steel sheet on the columnar structure 1 can be realized.

  FIG. 2 shows a flowchart of a method for winding a steel plate of a columnar structure to which the present invention is applied. First, in step S10, the suspension device 12 is attached in the vicinity of the upper end of the columnar structure 1 as shown in FIG. The suspension device 12 is composed of, for example, an electric chain block or the like, and a hook 12a for engaging a suspension target is provided at the lower end thereof. When the suspension device 12 is actually attached, a bracket 11 for supporting the suspension device 12 is attached to the columnar structure 1. The bracket 11 is joined so that the column abutting body 13 and the suspension fixing body 14 are L-shaped with each other. The column abutting body 13 is abutted against the surface of the columnar structure 1 and an anchor bolt is used. Then, the columnar structure 1 is fixed. The upper end portion of the suspension device 12 is attached to the suspension fixing body 14, and the suspension device 12 is supported so as to be suspended by the suspension device. For this reason, the suspension device 12 suspended by the bracket 11 requires only a small space around the columnar structure 1. For this reason, even if the working space W is narrow, the hanging device 12 can be installed without any problem.

  Next, it transfers to step S11 and winds up a steel plate about an underground part. The winding of the steel plate in the underground portion may be performed based on any conventional method. In step S11, for example, the steel sheet may be wound up by the method described below.

  As shown in FIG. 4A, the press-fitting device 21 is attached to the columnar structure 1. Next, as shown in FIG. 4B, below the press-fitting device 21, a steel plate connector 3 in which steel plate blocks described later are connected in the circumferential direction is attached to the columnar structure 1. Next, as shown in FIG. 4C, the steel plate connector 3 is press-fitted into the ground 2 using a press-fitting device 21. The press-fitting device 21 has an arm part 22 configured to be extendable in the vertical direction, and can be press-fitted by extending the steel plate connector 3 in a downward direction while abutting the lower end of the arm part 22. Has been. The steel plate connector 3 is pushed down via the arm portion 22, and press-fitting is performed while excavating with a water jet cutter or the like as necessary. At this time, it is assumed that press fitting is performed to such an extent that the upper end of the steel plate connector 3 protrudes slightly from the ground.

  Next, as shown in FIG. 5A, the second and subsequent stages from the bottom are similarly pressed into the ground 2 by pressing down the steel plate connector 3 with the press-fitting device 21. The press-fitting device 21 has an arm part 22 configured to be extendable in the vertical direction, and can be press-fitted by extending the steel plate connector 3 in a downward direction while abutting the lower end of the arm part 22. Has been. At this time, the steel plate connectors 3 adjacent to each other in the vertical direction are in contact with each other.

  Next, as shown in FIG. 5B, after all the press-fitting of the steel plate connector 3 in the underground portion is completed, the press-fitting device 21 is disassembled. At this stage, the clearance formed between the columnar structure 1 and the steel plate connector 3 is cleaned using a water jet to remove residues such as earth and sand. Actually, the internal cleaning routine may be confirmed using a camera or the like. Then, the steel plate connector 3 is integrated with the columnar structure 1 by filling the columnar structure 1 and the steel plate connector 3 with a filler such as concrete, non-separable non-shrink mortar, or adhesive. Fixed. The filler herein may be any material as long as it can be cured with time.

  In addition, winding of the steel plate in an underground part is not limited to the above-mentioned method. It is not limited to the case where the steel plate connector 3 is press-fitted in each step, and may be press-fitted in a plurality of steps. In addition to press-fitting, the ground 2 around the columnar structure 1 may be excavated in advance, and the steel plate coupling body 3 may be suspended by the suspension device 12 to perform the arrangement. The winding of the steel plate in the underground portion is not limited to these, and any known method may be adopted. Thus, after finishing winding of the steel plate in an underground part, the steel plate is wound about an above-ground part.

  FIG. 6 is a perspective view of a steel plate connector 3 for winding up the columnar structure 1 on the ground portion, and FIG. 7 is a plan view thereof.

  The steel plate connector 3 is configured by connecting steel plate blocks 31 in the circumferential direction. The structure of the steel plate block 31 is, for example, a steel plate having a L-shaped cross section as shown in FIG. 8A or a flat plate shape as shown in FIG. It consists of a steel plate. The surface of the steel plate block 31 may be plated or painted. However, at least the vicinity of the outer periphery of the steel plate block 31 may not be plated or painted because of the welded relationship. Further, the upper and lower end surfaces and the left and right end surfaces of the steel plate block 31 may be inclined slightly outward.

  In the present invention, such a steel plate connector 3 is continuously provided in a plurality of stages in the ground portion. A large number of holes 32 are regularly formed on the surface of the steel plate block 31. Each of the holes 32 is constituted by a through hole, and a certain hole 32 is constituted by a size into which a bolt or the like can be inserted, and the certain hole 32 is constituted by a size by which the hook 12a can be engaged.

  6 and 7, such a steel plate block 31 is joined in the circumferential direction to form one annular steel plate connector 3. The number of divisions and the division form of the steel plate blocks 31 may be anything. In the following example, a case where the steel plate blocks 31 are constituted by the steel plate blocks 31-1 to 31-6 will be described as an example.

  The steel plate blocks 31-1, 31-2, 31-5, 31-6 are all configured with an L-shaped cross section. For this reason, all the steel plate blocks 31-1, 31-2, 31-5, and 31-6 have a bent portion that is bent in a perpendicular direction. On the other hand, the steel plate blocks 31-3 and 31-4 are both flat. Incidentally, in the following description, as shown in FIG. 7, the case where the building 10 is closer to each other on the side where the steel plate blocks 31-3 and 31-4 are formed is taken as an example. The steel plate blocks 31-1 to 31-6 are fixed so as to have a predetermined interval H with respect to the columnar structure 1.

  When actually mounting such steel plate blocks 31-1 to 31-6 to the columnar structure 1, first, the process proceeds to the first stage forming step in step S 12. The meaning of the first level indicates the first level from the top, that is, the uppermost level. In the present invention, the uppermost steel plate coupling body 3 from the top is formed first, and then the lower steel plate coupling body 3 is joined one by one.

  In step S12, the steel plate block 31 is first carried in. The steel plate block 31 may be carried in by hanging the steel plate block 31 with the suspension device 12.

  Next, as shown in FIG. 9, in addition to the steel plate block 31-3, the steel plate block 31-4 is similarly arranged with respect to the columnar structure 1. At this stage, temporary assembly is performed by welding the steel plate block 31-3 and the steel plate block 31-4 adjacent to each other. In this temporary assembly, the welded portions 201 are formed in a dotted manner at the boundary between the steel plate block 31-3 and the steel plate block 31-4, thereby temporarily connecting each other. Similarly, as shown in FIG. 10, the remaining steel plate blocks 31 are repeatedly carried in and temporarily assembled sequentially. In this temporary assembly process, each steel plate block 31 constituting the first stage is held in a state of being suspended by the suspension device 12. As a result, the steel plate block 31 is temporarily assembled so as to enclose the columnar structure 1 in the first stage.

  Incidentally, in this temporary assembly stage, it is possible to finely adjust the position between the steel plate blocks 31. When the positions between the steel plate blocks 31 are adjusted with each other, for example, a chain block (not shown) is installed between adjacent steel plate blocks 31, and a tensile force is introduced through the chain of the installed chain blocks. You may do it.

  Next, as shown in FIG. 11, the steel plate blocks 31 are finally welded together. In this main welding, welding is performed linearly so as to fill the boundary between the steel plate blocks 31 by welding. As a result, as shown in FIG. 11, linear welds 59 are formed between the steel plate blocks 31 between the steel plate blocks 31, thereby making it possible to firmly fix each other.

  At this time, it is possible to easily form the welded portion 59 by performing so-called groove processing, in which the left and right ends of the steel plate block 31 are inclined as shown in FIG. Further, at this time, stable formation of the welded portion 59 can be realized by applying the steel piece 60 between the adjacent steel plate blocks 31 from the back side. When performing such groove processing, a steel piece 60 is attached in advance to any one of the steel plate blocks 31 from the back side, and the other steel plate book 31 is abutted and fixed to each other while being guided by the steel piece 60. It will be.

  In this manner, by joining the steel plate blocks 31 constituting the first stage to each other, it is possible to form the steel plate connector 3-1 configured in an annular shape with respect to the first stage. Hereinafter, the steel plate connector 3 having an n cross section from above is expressed as a steel plate connector 3-n.

  Next, the process proceeds from the first stage forming process in step S12 to the second stage forming process in step S13.

  When the process proceeds to the second stage forming step, first, as shown in FIG. 13A, the steel plate connector 3-1 is raised. As a result, the work height corresponding to the height at which the worker actually performs the work is released. The work height here is assumed to be a height based on the height from the feet of the worker who normally performs work on the ground 90, but is not limited to this. If the worker works on the work table installed on the ground 90, the work height based on that is set. Further, when the worker's feet are below the ground 90, the work height is set based on that.

  It should be noted that the working height is most effective based on the ground or near the ground. As will be described later, in the present invention, even in a narrow space where the scaffolding cannot be installed, there is an advantage that the steel sheet can be rolled up. This is because the winding can be performed without installation.

  After the work height is released in this way, as shown in FIG. 13B, the steel plate block 31 of the steel plate connector 3-1 constituting the second stage is carried in at the work height. An operator performs the joining operation | work of the steel plate block 31 carried in in work height. Incidentally, in carrying in the steel plate blocks 31 in the second and subsequent stages, a small chain block 41 other than the suspension device 12 is used. As shown in FIG. 14, the small chain block 41 is attached to a steel plate block 31 (in this example, any one of the steel plate blocks 31 constituting the first-stage steel plate connection body 3-1) at the upper stage. Yes. A hook 44 is provided at the lower end of the chain 43 in the small chain block 41, and the front end of the hook 44 is directly engaged with the hole 32 or is engaged with an anchor bolt 121 protruding from the hole 32. Thus, the steel plate block 31-3 can be suspended by the small chain block 41.

  The small chain block 41 is provided at a plurality of locations around the columnar structure 1. An operator grips the steel plate block 31-3 suspended through such a small chain block 41 and conveys it in the direction of the arrow in the figure. On the way, the steel plate block 31-3 is moved to another small chain block 41 and the conveyance is continued. Thereby, the steel plate block 31-3 can realize conveyance even when the work space is narrow. In particular, since the steel plate block 31-3 is formed in a flat plate shape, it can be carried in relatively easily even when the periphery of the columnar structure 1 is narrow.

  As shown in FIG. 15, the steel plate blocks 31-3 and 31-4 are sequentially carried in and temporarily assembled through the welded portion 201 formed in a dot shape in the same manner as described above.

  Similarly, as shown in FIG. 16, the remaining steel plate blocks 31 are repeatedly carried in and provisionally assembled sequentially. As a result, the steel plate block 31 is temporarily assembled so as to enclose the columnar structure 1 in the second stage. As a result, the steel plate block 31 constituting the steel plate connector 3-2 in the second stage is formed below the steel plate connector 3-1.

  In addition, when performing the carrying-in operation | work and temporary assembly operation | work of the steel plate coupling body 3-2 mentioned above, about this, the steel plate coupling body 3-1 in an upper stage is hold | maintained in the state hung with the suspension apparatus 12. FIG. .

  Next, as shown in FIG. 17, the steel plate connector 3-1 and the steel plate connector 3-2 are joined. Before and after the joining, the steel plate connector 3-2 is in a state where the steel plate blocks 31 are finally welded to each other in the same manner as the steel plate connector 3-1. In joining the steel plate connector 3-1 and the steel plate connector 3-2, the steel plate connector 3-1 is pushed down to the steel plate connector 3-2. Specifically, the suspension device 12 is used, and thereby the suspended steel plate connection body 3-1 is pushed down and connected to the lower steel plate connection body 3-2. And the steel plate block 31 which comprises the steel plate coupling body 3-1, and the steel plate block 31 which comprises the steel plate coupling body 3-2 are temporarily assembled mutually. This temporary assembly may be so-called spot welding.

  In addition, when this steel plate coupling body 3-1 and the steel plate coupling body 3-2 are joined together, the steel plate coupling body 3-2 may be pushed up and joined to the steel plate coupling body 3-1. . You may make it utilize the small chain block 41 mentioned above for pushing up upward of this steel plate coupling body 3-2.

  Next, the steel plate blocks 31 are temporarily assembled together between the steel plate blocks 31-2. In this temporary assembly, you may make it implement | achieve by welding the boundary between the steel plate blocks 31 which comprise the steel plate coupling body 3-2 to dot shape.

  Next, as shown in FIG. 18, the steel plate block 31 constituting the steel plate connector 3-1 and the steel plate block 31 constituting the steel plate connector 3-2 are main-welded to each other. Even in such a case, welding is performed linearly so as to fill the boundary between the steel plate connector 3-1 and the steel plate connector 3-2 by welding. As a result, a weld 59 is formed between the steel plate blocks 31.

  Similarly, the welded portion 59 can be easily formed by performing groove processing on the upper and lower ends of the steel plate block 31 as well.

  In addition, after finishing these processes, since the 1st-stage steel plate coupling body 3-1 and the 2nd-stage steel plate coupling body 3-2 are firmly attached to each other, they are lifted and integrated together. Pulling down can be performed freely.

  In this way, by joining the steel plate blocks 31 constituting the second stage to each other, it is possible to form the steel plate connector 3-2 configured in an annular shape with respect to the second stage. After completing a series of operations in step S13, the process proceeds to step S14, and construction of the third and subsequent stages of the steel plate connector 3 is performed. Incidentally, the specific procedure of step S14 is the same as that of step S13.

  Fig.19 (a) has shown about the case where construction of the steel plate coupling body 3-3 in a 3rd step is performed. Since the steel plate linking body 3-1 and the steel plate linking body 3-2 are firmly fixed to each other, the working height at which the worker works similarly by lifting them with the lifting device 12 in a state where they are coupled to each other. Will be released.

  After the work height is thus released, the steel plate block 31 of the steel plate connector 3-3 constituting the third stage is carried in at the work height. An operator performs the joining operation | work of the steel plate block 31 carried in in work height. As a result, the steel plate connector 3-3 is similarly joined and completed, and this is joined to the steel plate connector 3-2 on the upper stage. As a result, the steel plate connectors 3-1 to 3-3 can be integrally connected.

  Similarly, as shown in FIG. 19 (b), when the fourth-stage steel plate connection body 3-4 is to be constructed, the suspension devices are integrally connected to the steel plate connection bodies 3-1 to 3-3. Similarly, the working height at which the worker performs the work is released by lifting it up by 12. And the joining operation | work of the steel plate block 31 of the steel plate coupling body 3-4 is performed in this open work height. As a result, the steel plate connector 3-4 is similarly joined and completed, and this is joined to the upper steel plate connector 3-3. As a result, the steel plate connectors 3-1 to 3-4 can be integrally connected.

  These steps are repeatedly executed, and finally, as shown in FIG. 20A, the assembly of the steel plate linking body 3 constituting the lowermost stage in the ground part is performed at the above-described working height. FIG. 20 shows an example in which the steel plate connector 3-6 is at the lowest level, and the steel plate connector 3-6 is joined to the upper end of the steel plate connector 3 wound up in the underground portion. And the steel plate coupling bodies 3-1 to 3-5 located above the steel plate coupling bodies 3-6 are lowered by the suspension device 12. Next, the upper end of the structure 3-6 and the lower end of the steel plate connector 3-5 are joined to each other.

  Thus, when joining of all the steel plate coupling bodies 3 is completed, it transfers to step S15.

  When the process proceeds to step S <b> 15, the steel plate block 31 is temporarily fixed to the columnar structure 1. The temporary fixing may be performed by fixing anchor bolts 45 in the holes 42 formed in the columnar structure 1 as shown in FIGS. In such a case, an anchor bolt 45 is inserted into the hole 42 and the hole 32 in accordance with the hole 32 formed in the steel plate block 31 and the hole 42 formed in the columnar structure 1, and this is inserted through the washer 47. The nut 46 is screwed and fixed. At this time, by setting the hole 42 as a female screw, it is possible to screw and fix the male screw formed at the tip of the anchor bolt 45. Accordingly, by rotating the nut 46 and the anchor bolt 45, it is possible to freely perform not only attachment but also removal. In this manner, the steel plate block 31 can be temporarily fixed to the columnar structure 1 in a detachable manner.

  Moreover, in addition to this, as shown in FIG. 23, the steel plate block 31 may be further provided with a bolt 51 as a protruding body protruding from the steel plate block 31 toward the columnar structure 1. The bolt 51 can be inserted into the hole 32 in the steel plate block 31. At this time, in the hole 32, the nut 52 is welded in advance to the side of the steel plate block 31 facing the columnar structure 1, so that the bolt 51 can be screwed to the nut 52 to fix it. The tip of the bolt 51 is in contact with the columnar structure 1. And it becomes possible to control the space | interval H between the columnar structure 1 and the steel plate block 31 by rotating such a volt | bolt 51 between the nuts 52. FIG.

  Next, the process proceeds to step S16, and a filler 86 is filled in the gap between the steel plate connector 3 and the columnar structure 1 as shown in FIG. The filler 86 may be any material that hardens over time, such as concrete, non-shrink mortar, adhesive, and the like. When the filled filler 86 is cured, the steel plate connector 3 and the columnar structure 1 are integrated with no gap through the filler 86. In order to fill the filler 86, injection may be performed from the uppermost stage via a hose (not shown) or the like. In such a case, a scaffold 88 for setting the hose (not shown) between the steel plate connector 3 and the columnar structure 1 may be provided around the columnar structure 1.

  Thus, according to the steel sheet winding method of the columnar structure to which the present invention is applied, the steel plate connector 3 formed in the upper stage is raised. Thereby, the steel plate block 31 is newly carried in at the opened work height, and the steel plate block 31 is joined in the circumferential direction to form the lower steel plate connection body 3 having an annular shape. And the lower end of the steel plate coupling body 3 in an upper stage and the upper end of the steel plate coupling body 3 in a lower stage are joined. Then, the working height is newly opened to form the newly formed steel plate connector 3 by raising the joined upper steel plate connector 3 and the lower steel plate connector 3.

  For this reason, according to the present invention, it is possible for the worker to always perform the winding work of the steel sheet at the same work height, and it is possible to improve the work efficiency. Further, in the present invention in which the joining work can always be performed at the same work height, there is no need to separately install a scaffold around the columnar structure 1 for joining the steel plate connectors 3. In addition to this, in the present invention, it is not necessary to carry out construction by bringing the heavy machinery close to the columnar structure. For this reason, when the building is located around the columnar structure 1, the work space around the columnar structure 1 is narrowed. Even if the work space is narrow, it is possible to construct it if only the space for installation is secured.

  In addition, it is needless to say that the seismic reinforcement as an earthquake countermeasure can be realized by winding the steel plate connector 3 around the columnar structure 1.

  In addition, in embodiment mentioned above, the case where the columnar structure 1 was comprised with the same diameter from the upper end to the lower end to the last was demonstrated. However, it is needless to say that the present invention can be similarly applied when the columnar structure 1 has a shape whose diameter is reduced upward. In such a case, as shown in FIG. 24, for example, a steel plate connector 3-6 that is reduced in diameter toward the upper side may be provided in correspondence with the reduced diameter columnar structure 1. . Actually, winding is performed by connecting steel plate blocks according to the reduced diameter shape of the steel plate connector 3-6 in the circumferential direction.

  Thereby, it is also possible to reduce the diameter of the steel plate connector 3 in accordance with the reduced columnar structure 1. Thus, the material cost can be reduced by reducing the filling amount of the filler 86 to be used.

  Of course, according to the present invention, the present invention can be similarly applied even when the work space is not narrow. Even at a construction site where a sufficient work space can be secured, by applying the present invention, the worker can always work at a work height, there is no need to build a scaffold, and construction efficiency can be improved. It becomes possible.

  In the present invention, the case where the underground part (steps S10 and S11) is first constructed and then the ground part (after step S12) is described as an example. However, the present invention is not limited to this. Instead, the ground part may be constructed first, and then the underground part may be constructed.

DESCRIPTION OF SYMBOLS 1 Columnar structure 2 Ground 3 Steel plate coupling body 10 Building 11 Bracket 12 Lifting device 12a Hook 13 Column contact body 14 Suspension fixing body 21 Press fitting device 22 Arm part 31 Steel plate block 32 Hole 41 Small chain block 42 Hole part 43 Chain 44 Hook 45 Anchor bolt 46 Nut 47 Washer 51 Bolt 52 Nut 59 Welded portion 60 Steel piece 86 Filler 88 Scaffold 90 Ground 91 Heavy machine 92 Steel plate block 93 Ground 94 Hook 96 Scaffold 100 Steel plate connector 201 Welded portion

Claims (4)

In the steel sheet winding method of the columnar structure in which the steel sheet connected body in which the steel plate blocks are connected in the circumferential direction is connected to the periphery of the columnar structure in multiple stages,
A first stage forming step of carrying in the steel plate block to a working height at which an operator performs the winding work, and joining the steel plate block in the circumferential direction to form an annular first stage steel plate connection;
The steel plate block is newly added to the work height released by lifting the first-stage steel plate connection formed in the first-stage formation step by a lifting device attached to the upper end of the columnar structure . The second-stage steel plate connection that is carried while being hung to the lower end of the other small chain block other than the suspension device attached to the first-stage steel plate connection body and is annularly formed by joining the steel plate blocks in the circumferential direction. Forming a body and joining the upper end of the second-stage steel plate connection body to the lower side of the first-stage steel plate connection body;
In the third and subsequent stages of the steel plate connection body, the steel plate block is newly moved to the step immediately above the work height released by raising the upper steel plate connection body joined together vertically by the suspension device. Carrying in while hanging to the lower end of the small chain block attached to a certain steel plate connection body, joining the steel plate block in the circumferential direction to form an annular steel plate connection body, the upper end of the upper steel plate connection body A method of winding a steel sheet of a columnar structure, characterized by repeatedly performing further joining to the lower end of the steel sheet. The steel sheet winding method for a columnar structure according to claim 1, further comprising a filling step of filling a filler into a gap between the steel plate connector and the columnar structure joined together above and below. The method of winding a steel sheet of a columnar structure according to claim 1 or 2, wherein the steel sheet block is carried into the work height with respect to the ground or the vicinity of the ground.   A columnar structure, wherein the steel plate assembly is wound around by the method of winding a steel plate of the columnar structure according to any one of claims 1 to 3.

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