JP2011038381A - Reconstruction method for existing building - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reconstruction method for an existing building, which removes a middle column which reduces the number of cables or tension force, facilitates work, and can also be applied to a girder of a large span. <P>SOLUTION: A block 13 to be supported which is supported by a cable 17 is provided in a position lower than the connection of the middle column 3 with the upper beam 5, and tight-installation blocks 16 used for tightly installing the cable 17 are each provided in the position of a pair of outer peripheral columns 2 higher than the block 13 to be supported. Then the cable 17 is constructed between the pair of the tight-installation blocks 16 so that it can pass through the block 13 to be supported. After that, the cable 17 is retained by the tight-installation blocks 16 in a tension state, and the block 13 to be supported is supported by the cable 17. The part of the middle column 3 which is lower than the block 13 to be supported is removed in a state where the block 13 to be supported is supported. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for remodeling an existing building, and more specifically, includes an intermediate column and a pair of outer columns arranged at positions sandwiching the intermediate column in plan view and connected to the intermediate column by beams. The present invention relates to a remodeling method for removing an intermediate pillar in an existing building.

  Large buildings such as factories, warehouses, and office buildings are often constructed in a rigid frame structure with heavy steel structures or reinforced concrete structures. Heavy steel structures and reinforced concrete structures are characterized by high construction costs and long service life compared to wooden structures and lightweight steel structures. However, in recent years, the usage of buildings has been changed according to changes in the surrounding environment, and even if the same usage is used, the equipment and products housed in the building can become larger due to technological advances, etc. There is a growing need to renovate buildings that can provide large spaces by removing existing floors, beams and intermediate columns.

  However, in a ramen-structured building, the beams that support the roof and floor are supported not only by the outer pillars arranged on the outer periphery of the building but also by the intermediate pillars arranged inside the building. The middle pillar cannot be removed. Therefore, as a remodeling method to remove the intermediate column of the existing building, after installing the seismic reinforcement of the outer frame or the seismic isolation device, with the large beam supported by the temporary support in the vicinity of the intermediate column to be removed, Cut the intermediate pillar at its head and remove it, disassemble the joints at both ends of the girder and put it in a simple support state, install a cable on the girder and introduce post tension, and then both ends of the girder An invention has been proposed in which a dismantled part is restored to a rigid joint state with respect to the outer frame (see Patent Document 1). According to this invention, it is possible to reduce the bending stress of the large beam and the bending stress of the outer peripheral column by the post tension by the cable.

Japanese Patent No. 3878900

  However, in the remodeling method described in Patent Document 1, the cable fixing member and the cable direction changing member are arranged so that the cable is positioned above the large beam at both ends of the large beam and positioned below the large beam at the longitudinal center of the large beam. Because the cable is installed on the side surface of the cable, the cable cannot be raised more than the beam of the large beam, and the cable tension required for the bending stress reduction amount of the large beam is large. Therefore, when the number of cables increases and the cross-sectional dimensions of the cables increase, the number of spans is large, and when the required amount of bending stress reduction for large beams is large, cables are installed on the sides of the large beams. It may not be possible to remove all the intermediate pillars alone. Furthermore, since it is necessary to apply a large tension force to the cable, the tension tool for tensioning the cable is also increased in size, making it difficult to handle and poor workability.

  The present invention has been made in view of such a background, and reduces the number of cables or tension, can be easily operated, and removes an intermediate column applicable to a large span large beam. The purpose is to provide.

  In order to solve the above problems, the first invention is arranged at a position sandwiching the intermediate column (3) and the intermediate column (3) in plan view, and is connected to the intermediate column (3) by a beam (5), respectively. In the existing building (1) having a pair of outer pillars (2), it is a modification method for removing the intermediate pillar (3), which is lower than the joint with the beam (5) in the intermediate pillar (3) A step of providing a supported means (13) to be supported by the cable (17), and a tensioning of the cable (17) at a position higher than the supported means (13) in the pair of outer columns (2) Respectively, a step of laying a cable (17) between the pair of tensioning means (16, 21) so as to pass through the supported means (13), and a tensioning means Hold the cable (17) in tension in (16, 21) A step of supporting the supported means (13) by the cable (17), and a state where the supported means (13) is supported by the cable (17) below the supported means (13) of the intermediate column (3). And removing the side portion.

  Here, the outer column includes not only the outer column arranged on the outer periphery of the building but also the intermediate column adjacent to the intermediate column to be removed in a building having two or more intermediate columns in one row, It means a column adjacent to the outer peripheral side of the intermediate column to be removed. Further, the beam is not limited to the uppermost one that supports the roof or the roof slab, but includes those that support the slabs on the intermediate floor or the uppermost floor. And the existing building is not limited to a one-story one-storied house, but also includes multi-story buildings with multiple levels, and the number of intermediate pillars to be removed is not limited to one per row, but one level of intermediate pillars. It is not limited to. Further, supporting the supported means is not limited to the form of supporting the total load including the load applied to the supported means and the own weight, and includes a form of supporting a part thereof.

  According to the present invention, since the supported means is provided at a position lower than the joint portion of the intermediate column with the beam, and the extending means is provided at a position higher than the supported means at the pair of outer columns, the pair of extending means The rise of the cable stretched between them can be increased. Therefore, the tension of the cable with respect to the amount of bending stress reduction of the beam is reduced, and the number of cables can be reduced or the cross-sectional dimension of the cable can be reduced. In addition, since the existing intermediate pillar is used as a bundle leaving its upper part, it is not necessary to separately prepare a bundle member having a large size and firmly fix it to the beam. Also, since the tension of the cable against the bending stress reduction amount of the beam can be reduced by changing the position where the supported means is provided, the number of spans is large, and the required bending stress reduction amount of the large beam is reduced. Even if it is large, it is possible to remove all the intermediate pillars with a relatively small tension. In addition, since the tension force applied to the cable is small, it can be constructed with a small tension tool, and the workability is also good.

  The second invention is a method of remodeling an existing building (1) according to the first invention, wherein a load bypass means (temporary support frame 14, temporary support) is provided at a place where the supported means (13) is installed in the intermediate column (3). A step of providing the piece 18), a step of bypassing the transmission load transmitted to the supported portion (13) installation site in the load bypassing means (14, 18), and a bypass of the transmission load in the load bypassing means (14, 18) Cutting the intermediate column (3) in the vicinity of the lower end of the supported means (13) while the load is bypassed or while the load bypassing means (14, 18) is bypassed. It further has before the step which supports a support means (13), It is characterized by the above-mentioned.

  According to this invention, the load borne by the intermediate pillar to be removed is bypassed by the load bypass means so as not to pass through the supported member installation site, and the intermediate pillar to be removed is cut in a safe state where no load is applied. Can do. Also, by confirming the transmission load of the load bypassing means while tensioning the cable, the support load by the load bypassing means can be gradually transferred to the cable, and the desired bearing force is applied to the cable before removing the intermediate column. Can be demonstrated. Therefore, the safety of the remodeling work is improved.

  Moreover, 3rd invention is a remodeling method of the existing building (1) which concerns on 1st or 2nd invention, and is provided with tension means (21) rather than the junction part with the beam (5) in an outer pillar (2). It is provided at a high position.

  As described above, the farther the installation position of the supported means is from the joint with the beam, the more the cable rises and the bending stress of the beam can be reduced. The lower the ceiling is, the lower the minimum ceiling height is. According to this invention, instead of lowering the installation position of the supported means, conversely, the tensioning means is moved to a position higher than the joint portion with the beam to ensure the rise of the cable, and the space formed below The minimum ceiling height can be increased for effective use of the space.

  The fourth invention is a method of remodeling an existing building (1) according to any one of the first to third inventions, wherein the existing building (1) is a multi-layer building having a plurality of beams (4, 5). Before the supported means (13) is supported by the cable (17), the pair of outer pillars (2) of the beam (4) joined at a position lower than the supported means (13) in the intermediate pillar (3) ) And a step of removing the edge-cut beam (4) with respect to the pair of outer pillars (2) after the cable (17) supports the supported means (13). It is characterized by that.

  According to the present invention, when removing a beam (or a beam and a floor) located below a beam reinforced with a cable as well as an intermediate pillar in a multi-layer building having a plurality of layers with a beam or a floor together with the beam, When the cable supports the supported means, stress is generated in the outer column due to the tension, and stress is also generated in the joint between the lower beam and the outer column and the lower beam. In addition to the need to calculate the stress, it is necessary to cut the lower beam in a dangerous state where stress has occurred, but before supporting the supported means on the cable, the lower beam and the outer column By cutting the edge, the lower beam can be cut in a safe state in which such stress does not occur. Therefore, the safety of the beam removal work can be ensured, the stress calculation is simplified, and the construction plan is easy. Also, by removing the lower beams (or beams and floors), not only can the space of large floors be provided, but the load on the existing building itself is reduced, so the earthquake resistance is improved or the outer pillars are reinforced. When necessary, the scale of reinforcement can be reduced.

  As described above, according to the present invention, it is possible to provide a method for remodeling an existing building that reduces the number of cables or tension, can be easily operated, and removes an intermediate column that can be applied to a large span large beam. .

Schematic sectional view before remodeling of an existing building according to the first embodiment Schematic sectional view after remodeling of an existing building according to the first embodiment Explanatory drawing which shows the remodeling procedure of the existing building which concerns on 1st Embodiment Explanatory drawing which shows the remodeling procedure of the existing building which concerns on 1st Embodiment Explanatory drawing which shows the remodeling procedure of the existing building which concerns on 2nd Embodiment Explanatory drawing which shows the remodeling procedure of the existing building which concerns on 2nd Embodiment Schematic sectional view of an existing building according to the third embodiment The principal part top view of the existing building which concerns on 3rd Embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<< First Embodiment >>
As shown in FIG. 1, the existing building 1 before remodeling according to the first embodiment is a steel-framed two-story factory, and a pair of outer peripheral columns 2 disposed on the outer periphery of the building, between the outer peripheral columns 2 and the like. Two intermediate pillars 3 arranged at intervals and in a row, an intermediate beam 4 connecting the pillars 2 and 3 horizontally and linearly at the intermediate height position, and the upper ends of the pillars 2 and 3 in plan view And the upper beam 5 connected in a straight line. The existing building 1 is constructed on a horizontal ground G, the two outer pillars 2 and the two intermediate pillars 3 have the same ground length, and the ground length of the outer pillar 2 is the ground length of the intermediate pillar 3. Somewhat shorter than that. Therefore, the upper beam 5 extends horizontally at a portion where the intermediate columns 3 are connected to each other, but extends at a downward slope toward the outer peripheral column 2 at a portion where the intermediate columns 3 and the outer peripheral column 2 are connected. is doing. A slab 6 (see FIG. 3) is constructed on the intermediate beam 4, a roof (not shown) is installed on the upper beam 5, and an outer wall (not shown) along the outer periphery of the existing building 1 is provided on the outer column 2. ) Is connected.

  As shown in FIG. 2, in the existing building 1 after remodeling, the intermediate beam 4 supporting the slab 6 (see FIG. 3) on the second floor is removed and the two intermediate pillars 3 (see FIG. 1) are removed. Thus, one large space defined by the outer peripheral column 2 (and an outer wall (not shown) connected thereto) and the upper beam 5 (and a roof (not shown) connected thereto) is formed. Although the details will be described later, the two intermediate pillars 3 each have a joint portion to which the upper beam 5 is joined and an extension portion (hereinafter collectively referred to as a head portion 3a) extending below the joint portion. Has been. A supported block 13 to be supported by the cable 17 is attached to the lowermost part of each head 3a, and a tension block 16 for tensioning the cable 17 is attached to the uppermost part of each outer peripheral column 2. The cable 17 spanned between the two stretched blocks 16 supports the supported block 13.

  Next, a method for remodeling the existing building 1 according to the present embodiment will be described with reference to FIGS. 3 and 4. First, as shown in FIG. 3A, the temporary column 11 is built in the vicinity of the outer peripheral column 2 on the ground G to support the intermediate beam 4. Specifically, the temporary column 11 supports the vicinity of the cut portion outside the building of the intermediate beam 4 to be removed.

  Next, as shown in (B), the outer peripheral column 2 is reinforced with an appropriate reinforcing member 12, and a supported block 13 is attached to the lowermost portion of the head 3a for each intermediate column 3 to be removed. The reinforcing member 12 may have any form as long as the outer peripheral column 2 can support the supporting load that is increased by removing the intermediate column 3. In addition, although illustration is abbreviate | omitted, in this embodiment, after removing a part of slab 6, the reinforcement member 12 is between the foundation of the outer periphery column 2, the intermediate beam 4, and the intermediate beam 4 and the upper beam 5. Reinforcing columns made of I-shaped steel are installed at two locations in between, and these reinforcing columns are joined to the outer peripheral column 2, the intermediate beam 4 and the upper beam 5, respectively, and a connecting plate is provided between the flanges of the intermediate beam 4 made of I-shaped steel. The flanges of the upper and lower reinforcing columns are connected by welding. On the other hand, the supported block 13 is composed of a pair of steel members sandwiching the intermediate pillar 3 made of H-shaped steel, and each member inserts or receives the cable 17 such as a through hole having a circular cross section or a groove opening downward. A load receiving portion that receives an upward load by the cable 17 is provided, and is frictionally joined to the intermediate column 3 by a through bolt.

  Next, as shown in (C), the edge of the intermediate beam 4 with the outer peripheral column 2 is cut, that is, the intermediate beam 4 is cut along the surface of the reinforcing member 12 on the inner side of the building, It divides | segments into the edge part which became a part of outer periphery pillar 2. FIG. In addition, a hydraulic jack 15 as a support load variable means is incorporated on the slab 6 supported by the intermediate beam 4 and a temporary support base 14 for temporarily supporting the supported block 13 is installed. To increase the support load and transmit the load to the support block 13 installation site in the intermediate column 3, that is, the load on the upper beam 5 and the roof supported by the intermediate column 3, and the head 3a of the intermediate column 3 The load of the supported block 13 is supported. The temporary support base 14 bypasses the load transmitted to the support block 13 installation site of the intermediate column 3 without transmitting it to the lower end of the head 3a to be cut later, so that the intermediate beam 4, that is, the supported block 13 is bypassed. It is transmitted to the beam immediately below. Most of the detoured load is transmitted again to the original intermediate column 3 via the intermediate beam 4.

  And as shown in FIG.4 (D), the extending | stretching block 16 for extending the cable 17 is joined to the outer side of the upper end part building of both the outer periphery pillars 2, respectively. The tension block 16 is installed at a position higher than the supported block 13. Thereafter, the cable 17 is bridged between the two stretched blocks 16 so as to pass through the load receiving portion of the supported block 13. In the present embodiment, two cables 17 are installed corresponding to the supported block 13, but it goes without saying that the number is not limited to two. Then, a tensile force is applied to the cable 17 using an appropriate tension tool such as a post tension jack. At this time, the tensile force of the cable 17 is gradually increased until the value becomes substantially zero while confirming the supporting load with a hydraulic gauge provided in the hydraulic jack 15 as means for measuring the load supported by the temporary support base 14. go. Then, the cable 17 is held by the tension block 16 in a state where the support load by the temporary support base 14 becomes substantially zero, that is, in a state where the total load transmitted to the supported block 13 is supported by the cable 17. The cable 17 can be held by the tension block 16 easily and reliably by using a wedge-shaped fixing tool or the like.

  Next, as shown in (E), the intermediate column 3 is cut along the lower end of the head 3 a, that is, the lower end surface of the supported block 13. In this state, since the stress (particularly the compressive stress due to the vertical load) at the cutting portion of the intermediate column 3 is substantially zero, the cutting operation can be performed safely. After the intermediate pillar 3 is cut and divided into the head 3a and the other lower part, the second floor portion of the intermediate pillar 3 is removed and the temporary support base 14 is removed.

  Finally, the slab 6 on the second floor, the intermediate beam 4, the first floor portion of the intermediate pillar 3 and the temporary pillar 11 are removed, and the modification for removing the intermediate beam 4 and the two intermediate pillars 3 on the second floor is completed. .

  Thus, by providing the supported block 13 at the lower end of the head 3a, the tensioning block 16 is arranged at a higher position than the supported block 13, and the rise of the cable 17 can be increased. The bending stress of the upper beam 5 can be greatly reduced with a relatively small tensile force.

  Further, as in the above embodiment, when two intermediate pillars 3 are removed and the upper beam 5 for three spans is set to one span, it may not be possible with a conventional prestressing technique. By adjusting the length of the head 3a (the length of the bundle), it is possible to increase the support force by the cable 17 even with the same tensile force. Therefore, according to the present invention, a modification method for removing the intermediate column 3 is possible. The scope of application is greatly expanded.

  Further, the support load borne by the intermediate pillar 3 to be removed is temporarily supported by the temporary support base 14, the tensile force of the cable 17 is gradually increased, and the support load is transferred from the temporary support base 14 to the cable 17. By confirming the supporting load with a hydraulic gauge, the cable 17 can exert the desired supporting force, and the intermediate column 3 can be safely removed with no vertical load applied to the lower portion of the intermediate column 3 to be removed. Can be cut off. Therefore, the removal work of the intermediate pillar 3 can be performed safely. In the present embodiment, the intermediate column 3 is first cut at the lower end of the head 3a. However, the intermediate column 3 may be cut at any position on the lower part of the intermediate column 3 to be removed.

  And in the said embodiment which also removes the intermediate beam 4 which supports the 2nd floor slab 6, when the supported block 13 is supported by the cable 17, the stress is also generated in the outer peripheral column 2 due to the change in the stress. Since stress is also generated at the joint between the intermediate beam 4 and the outer peripheral column 2 and the intermediate beam 4, complicated stress calculation is required. Before the cable 17 supports the supported block 13, the intermediate beam 4 and the outer periphery By cutting the edge with the column 2, the intermediate beam 4 can be cut in a safe state without such stress. Therefore, the removal work of the intermediate beam 4 can be performed safely, the stress calculation is simplified, and the construction plan is easy.

<< Second Embodiment >>
Next, a second embodiment according to the present invention will be described with reference to FIGS. The procedures shown in FIGS. 5A and 6F are the same as the procedures referring to FIGS. 3A and 4F of the first embodiment, and thus the description thereof is omitted. The detailed description which overlaps is also abbreviate | omitted and the same code | symbol is attached | subjected to the member same as 1st Embodiment.

  In this embodiment, as shown in FIG. 5 (B), the outer peripheral column 2 is reinforced with an appropriate reinforcing member 12, and the head 3a and the lower removal site are separated from each intermediate column 3 to be removed. The temporary support piece 18 is attached so as to straddle the boundary up and down. The temporary support piece 18 of the present embodiment is a pair of steel materials exhibiting a substantially U-shape, and the vertical dimension is made as small as possible within a range that does not hinder the attachment of the supported block 13, and its upper end portion. And a lower end part is welded to the intermediate | middle pillar 3. FIG. And the temporary support piece 18 fulfill | performs the load detouring function which detours the load of the intermediate pillar 3 received by the upper end part, and transmits to the intermediate pillar 3 again by a lower end part so that it may mention later.

  Thereafter, as shown in (C), the edge of the intermediate beam 4 with the outer peripheral column 2 is cut. Further, the intermediate column 3 is cut at the lower end portion of the head portion 3a, and the supported block 13 is attached to the lowermost portion of the head portion 3a. When cutting the intermediate column 3, the temporary support piece 18 does not bypass the load of the intermediate column 3, and compressive stress due to the load of the upper beam 5 or the like is generated in the cut portion. Since the vertical dimension is small, the compressive strain accompanying the load application is very small. Therefore, as the cutting work of the intermediate column 3 proceeds, a load that transmits the intermediate column 3 is gradually applied to the temporary support piece 18, and all the loads of the intermediate column 3 are applied to the temporary support piece 18 when the cutting of the intermediate column 3 is completed. All the transmission load is transmitted from the lower end portion of the temporary support piece 18 to the intermediate column 3 again. That is, the work of cutting the intermediate pillar 3 is the work of bypassing the transmission load to the temporary support piece 18.

  Then, as shown in FIG. 6D, the extension block 16 is joined to the outside of the upper end building of both outer peripheral pillars 2, and the cable 17 is extended to pass through the load receiving part of the supported block 13. It is bridged between the blocks 16. Then, a tension force is applied to the cable 17 using an appropriate tension tool, and the cable 17 is supported on the tensioning block 16 in a state where the total load transmitted to the supported block 13 installation site in the intermediate pillar 3 is supported by the cable 17. Hold. As a means for measuring the transmission load after welding the temporary support piece 18 to the intermediate column 3 in order to determine whether or not the entire load of the intermediate column 3 bypassing the temporary support piece 18 is supported by the cable 17. May be provided in the vertical portion of the temporary support piece 18 to confirm that the amount of distortion before cutting the intermediate column 3 is reached.

  Thereafter, as shown in (E), the temporary support piece 18 is removed, and finally, as shown in (F), the second floor portion of the intermediate pillar 3 is removed and the slab 6 on the second floor, the intermediate beam 4, The remodeling of removing the first floor portion of the intermediate pillar 3 and the temporary pillar 11 and removing the intermediate beam 4 and the two intermediate pillars 3 of the second floor portion is completed.

  In addition, in this embodiment, although the temporary support piece 18 is comprised only with steel materials, you may provide a hydraulic jack similarly to 1st Embodiment in the intermediate part extended perpendicularly | vertically at the time of installation.

<< Third Embodiment >>
Next, a third embodiment according to the present invention will be described with reference to FIGS. In addition, description about the procedure which overlaps with 1st Embodiment is abbreviate | omitted, and only a different point from 1st Embodiment is demonstrated. The same members as those in the first embodiment are denoted by the same reference numerals.

  The present embodiment is different from the first embodiment in the installation position and shape of the tension block 21. The tension block 16 of the first embodiment is installed at the upper end portion of the outer peripheral column 2, that is, at the joint portion with the upper beam 5 in the outer peripheral column 2. This is because, since the tensile load of the cable 17 acts on the outer peripheral column 2, if the tension block 16 is installed at a position away from the joint with the upper beam 5, the tensile force of the cable 17 causes a large bending moment on the outer peripheral column. Because it acts as. On the other hand, from the viewpoint of increasing the rise of the cable 17, it is desirable that the tension block 16 be provided at a position as high as possible. Therefore, in the first embodiment, in order to prevent bending stress from acting on the outer peripheral column 2 and to ensure the rise of the cable 17, it is necessary to lengthen the head 3a of the intermediate column 3 (make the bundle larger). .

  Therefore, in this embodiment, the extending block 21 is provided at a position higher than the joint portion of the outer peripheral column 2 with the upper beam 5. Thereby, the head 3a of the intermediate column 3 can be shortened (the bundle is reduced), or the bending stress reduction amount of the beam with respect to the cable pulling force can be increased. The extending block 21 provided so as to extend above the outer peripheral column 2 has a long shape in the extending direction of the cable 17 so as to withstand the tensile force of the cable 17 and extends from the outer peripheral column 2. The part that transmits the load is transmitted to the upper beam 5.

  In addition, as shown in FIG. 8, the two cables 17 arranged so as to sandwich the intermediate pillar 3 extend in parallel between the intermediate pillars 3, and are flat between the intermediate pillar 3 and the outer peripheral pillar 2. It extends so as to open toward the outer peripheral column 2 in view. Thereby, the two cables 17 not only reduce the bending stress in the vertical direction with respect to the upper beam 5 but also suppress the deflection in the horizontal direction.

  This is the end of the description of specific embodiments, but the present invention is not limited to these embodiments. For example, in the above-described embodiment, the present invention is applied to an existing building having two floors. However, the present invention can also be applied to an existing building having one or three floors. In addition, when the existing building is more than 3 stories and all intermediate beams and slabs above the 2nd floor are removed, and the intermediate pillars are also removed on all floors, the following removal method may be adopted. . That is, for each beam (upper beam 5 and intermediate beam 4) from which the intermediate column 3 is removed, the supported block 13 and the extending block 16 or 21 are provided and the cable 17 is installed. Then, the temporary support base 14 or the temporary support piece 18 is provided to support the intermediate column 3, and the portion below the supported block 13 in the intermediate column 3 is removed in a state where the supported block 13 is supported by the cable 17. Repeat the work from the upper floor to the lower floor. In this way, by removing the intermediate pillars in order from the upper floor, the load bypass means can be used as the temporary support base 14 for transmitting the load to the intermediate beam 4 directly below the supported block 13 shown in the first embodiment, or The intermediate beam above the second floor has a simple configuration such as a temporary support piece 18 that transmits a load to a portion below the portion where the supported block 13 is provided in the intermediate pillar 3 shown in the second embodiment. 4 and all of the slabs 6 and the intermediate pillar 3 over the entire floor can be removed. Further, in an existing building having a plurality of layers of beams, it is possible to remove the beams every other layer, or to remove the beams by every two layers.

  Moreover, in the said embodiment, although this invention was applied to the existing building which has two intermediate pillars in one cross section, naturally it is applicable also to the existing building which has one or more intermediate pillars. In the case of an existing building having a plurality of intermediate pillars in one section, it is possible to remove all the intermediate pillars. However, only a few of them are removed, for example, one of the two. A form in which only one book is removed or a form in which the other four are removed while leaving one in the center is also possible. In this case, the intermediate column adjacent to the intermediate column to be removed corresponds to the outer column in the present invention. Furthermore, although the said embodiment demonstrated the cross section of the existing building regarding the method of removing an intermediate pillar, when the intermediate pillar 3 has two or more rows, what is necessary is just to work in the said procedure with respect to each row. Moreover, although the said embodiment is a form which stretches a cable only to 1 direction, it is also possible to stretch a cable to 2 directions orthogonal.

  In the above embodiment, the temporary support base 14 or 18 is installed as a load bypassing means, and the intermediate pillar 3 is cut after the load of the intermediate pillar 3 is bypassed. The intermediate column 3 may be cut after supporting the intermediate column and sufficiently reducing the load transmitted below the supported block 13. Also in this case, the residual stress of the cut portion may be estimated by installing a strain gauge at a position below the position where the supported block 13 is provided in the intermediate column 3.

  Moreover, in the said embodiment, although this invention was applied to the existing building of the steel structure which has a ramen structure, it is applicable also to the existing building of a reinforced concrete structure or a steel frame reinforced concrete structure. In addition to these changes, the specific shapes of the supported means and the tensioning means can be appropriately changed as long as they do not depart from the spirit of the present invention.

1 Existing building 2 Perimeter column (outside column)
3 Intermediate column 3a Head 4 Intermediate beam 5 Upper beam 6 Slab 11 Temporary column 12 Reinforcement member 13 Supported block 14 Temporary support frame (load bypass means)
15 Hydraulic jack 16 Tension block 17 Cable 18 Temporary support piece (load bypass means)
21 Tension Block G Ground

Claims (4)

In an existing building having an intermediate pillar and a pair of outer pillars arranged at positions sandwiching the intermediate pillar in plan view and connected to the intermediate pillar by beams, respectively, a modification method for removing the intermediate pillar,
Providing a supported means to be supported by a cable at a position lower than the joint with the beam in the intermediate column;
Providing a tensioning means for tensioning a cable at a position higher than the supported means in the pair of outer pillars;
Laying a cable between the pair of stretching means so as to pass through the supported means;
Causing the tensioning means to hold the cable in a tension state, and allowing the cable to support the supported means;
A method of remodeling an existing building, comprising a step of removing a portion of the intermediate pillar below the supported means in a state where the supported means is supported by the cable. Providing a load bypass means at the supported means installation site in the intermediate column;
Diverting the load to be transmitted to the supported means installation site to the load bypass means;
Cutting the intermediate column in the vicinity of the lower end of the supported means while the load bypassing means bypasses the transmission load, or while the load bypassing means bypasses the transmission load;
The method for remodeling an existing building according to claim 1, further comprising a step of supporting the supported means on the cable.   The method for remodeling an existing building according to claim 1, wherein the extension means is provided at a position higher than a joint portion of the outer column with the beam. The existing building is a multi-layered building having a plurality of layers of beams,
Before supporting the supported means on the cable, cutting the edge of the beam that joins the intermediate pillar at a position lower than the supported means with respect to the pair of outer pillars;
The method further comprises a step of removing a beam having a cut edge with respect to the pair of outer pillars after the supported means is supported by the cable. Remodeling method of existing building as described in section.

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