JP2016102298A - Building raising structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a decrease in strength of a column, which is caused by raising a building.SOLUTION: A building raising structure includes: a retainer member that is arranged on a side surface of a steel column provided in a building; a rod-like member that passes through a through-hole provided in the side surface to frictionally join the retainer member to the side surface; and a jack that raises the building by jacking up the retainer member and lifting the column.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a building raising structure that raises a building with a jack.

  As a conventional method for dealing with the uneven settlement of a building, there is a method in which a pillar is lifted by attaching a load receiving beam to a pillar that has been depressed in the building, and the building is partially raised to repair it.

  For example, in Patent Document 1, by lifting up both ends of a load receiving beam disposed through an opening formed in a web of an H-shaped steel column, the H-shaped steel column is lifted to raise the building. A method is disclosed.

  However, in this method, since an opening hole having a size enough to penetrate the load receiving beam is formed in the web of the H-shaped steel column, there is a concern that the strength may be reduced due to a cross-sectional defect of the H-shaped steel column.

JP 2014-40749 A

  This invention considers the fact concerned, and makes it a subject to reduce the strength fall of the pillar which arises in order to raise a building.

  The invention of the first aspect includes a receiving member disposed on a side surface of a steel column provided in a building, and a rod-shaped member that is penetrated by a through hole provided in the side surface and frictionally joins the receiving member to the side surface. And a jack that raises the building by jacking up the receiving member and lifting the pillar.

  In the first aspect of the invention, since the receiving member is joined to the column by the rod-shaped member, in order to attach the receiving member to the column, a small-diameter through hole through which the rod-shaped member passes may be provided on the side surface of the column. Therefore, the cross-sectional defect | deletion of a pillar can be made small and the strength reduction of a pillar can be reduced. That is, it is possible to reduce a decrease in the strength of the pillar that occurs to raise the building.

  Further, since the main processing applied to the column for attaching the receiving member is only the formation of the through hole, it is possible to reduce the time and effort of the processing applied to the column for attaching the receiving member.

  According to the second aspect of the invention, in the building raising structure of the first aspect, at least one of the side surface and the contact surface of the receiving member is subjected to a surface treatment for increasing the friction coefficient of the contact surface.

  In the second aspect of the invention, at least one of the side surface of the column and the contact surface of the receiving member is subjected to a surface treatment for increasing the friction coefficient of the contact surface, thereby increasing the frictional resistance (slip resistance) of the contact surface. The bonding strength between the column and the receiving member can be increased.

  In addition, by applying a surface treatment that increases the friction coefficient of the contact surface to at least one of the side surface of the column and the contact surface of the receiving member, the bonding strength between the column and the receiving member can be increased. Can be reduced. Thereby, since the number of the through-holes which a rod-shaped member penetrates can be reduced, the effort of the process given to a pillar in order to attach a receiving member to a pillar can be reduced, and the strength reduction of a pillar can be reduced more.

  According to a third aspect of the invention, in the building raising structure of the first or second aspect, the column is made of H-section steel, and the receiving member is joined to the web surface of the H-section steel.

  In the third aspect of the invention, by joining the receiving member to the web surface of the column, it is not necessary to provide a through hole in the flange that has a large effect on the strength of the column, so that a decrease in the strength of the column can be further reduced. .

  Since this invention set it as the said structure, the strength fall of the column produced in order to raise a building can be reduced.

It is a perspective view which shows the building raising structure which concerns on embodiment of this invention. It is a front view which shows the building raising structure which concerns on embodiment of this invention. It is an AA arrow line view of FIG. It is a front view which shows the condition where the pillar is lifted by the jackup which concerns on embodiment of this invention. It is a front view which shows the condition where the lower end part of the pillar lifted by the jackup which concerns on embodiment of this invention was fixed to the footing. It is a top view which shows the variation of the building raising structure which concerns on embodiment of this invention. It is a front view which shows the variation of the flange provided in the receiving beam which concerns on embodiment of this invention. It is a front view which shows the variation of the flange provided in the receiving beam which concerns on embodiment of this invention. It is a top view which shows the variation of the building raising structure which concerns on embodiment of this invention. It is a front view which shows the brace member which concerns on embodiment of this invention. It is a front view which shows the inner wall which concerns on embodiment of this invention.

  Embodiments of the present invention will be described with reference to the drawings. First, the building raising structure which concerns on embodiment of this invention is demonstrated.

  In the perspective view of FIG. 1 and the front view of FIG. 2, a building raising structure 14 provided on the sinking pillar 12 of the building 10 is provided to partially lift and repair the existing building 10 that has been sinking. It is shown.

  The building raising structure 14 is configured by attaching receiving members 16A and 16B to the pillar 12 and setting jacks 18A and 18B so as to support the receiving members 16A and 16B.

  1 and 2 show a state before the receiving members 16A and 16B are jacked up by the jacks 18A and 18B. The building raising structure 14 includes receiving members 16A and 16B, a high-strength bolt 20 as a rod-shaped member, a nut 22, and jacks 18A and 18B.

  The column 12 is a steel member made of an H-shaped steel having a web 38 and flanges 40 and 42, and is supported on a reinforced concrete footing 26 which is an independent footing foundation installed on the ground 24. An anchor member 32 is embedded in the footing 26 so that the male screw portion 30 protrudes upward from a steel base plate 28 provided on the upper surface of the footing 26. Then, the male screw portion 30 is passed through a through-hole formed in the steel joining plate 34 provided at the lower end portion of the column 12, and an anchor nut 36 is screwed into the male screw portion 30 to be joined to the base plate 28. By joining the plate 34, the lower end of the column 12 is fixed to the footing 26.

  As shown in FIG. 2 and FIG. 3 which is an AA arrow view of FIG. 2, the receiving members 16A and 16B are provided on the receiving beams 44A and 44B made of H-shaped steel and the ends of the receiving beams 44A and 44B. Steel flanges 46A, 46B provided, and the joint surfaces of the flanges 46A, 46B are opposed to the left and right web surfaces of the web 38 of the column 12, respectively. It is arranged on the side surface of the pillar 12 so as to overhang.

  The receiving members 16A and 16B have a plurality of through holes as bolt holes formed in the web 38 of the column 12 in a state where the web 38 of the column 12 is sandwiched from the left and right by the flanges 46A and 46B of the receiving members 16A and 16B. 48 and nuts 22 are screwed into and tightened into high-strength bolts 20 that are penetrated into a plurality of through holes 50A and 50B as bolt holes formed in flanges 46A and 46B. By being pressed against the surface of the web 38, it is friction bonded to the side surface of the column 12. That is, the receiving members 16 </ b> A and 16 </ b> B are joined to the side surface of the column 12 by the high-strength bolts 20 that penetrate the through holes 48 provided on the side surface of the column 12.

  The receiving members 16A and 16B are supported by jacks 18A and 18B installed on the footing 26, respectively. The building 10 is partially raised by jacking up the receiving members 16A, 16B with the jacks 18A, 18B and lifting the pillars 12 up.

  Next, an example of a method for repairing the partially depressed building 10 by partially raising the building 10 by using the building raising structure 14 will be described with reference to the front views of FIGS. 2, 4, and 5. Here, in order to repair the building 10 that has sunk, the building 10 is partially raised by lifting the sunk pillars 12.

  First, as shown in FIG. 2, a plurality of through holes 48 are formed in advance in the web 38 of the pillar 12 that is lifted by the jacks 18 </ b> A and 18 </ b> B in order to repair the building 10 that has been sunk. The through-hole 48 may be formed in the column 12 anytime, and may be formed in the column 12 anywhere before the receiving members 16 </ b> A and 16 </ b> B are attached to the column 12. For example, the through hole 48 may be formed in the pillar 12 immediately before attaching the receiving members 16A and 16B to the pillar 12, or the building 10 is formed by the pillar 12 formed in the factory and having the through hole 48 formed therein. The through-hole 48 may be formed in the column 12 at the construction stage of the building 10 such as building.

  Next, as shown in FIG. 2, the joint surfaces of the flanges 46A and 46B of the receiving members 16A and 16B are opposed to the left and right web surfaces of the web 38 of the column 12, respectively, and project from the web 38 of the column 12 to the left and right. The receiving members 16 </ b> A and 16 </ b> B are disposed on the side surface of the column 12.

  Next, as shown in FIG. 2, high strength is applied to the plurality of through holes 50A, 50B formed in the flanges 46A, 46B of the receiving members 16A, 16B and the plurality of through holes 48 formed in the web 38 of the column 12. After the bolt 20 is passed through, the nut 22 is screwed into the high-strength bolt 20 and tightened, and the joining surfaces of the flanges 46A and 46B are pressed against the web surface of the column 12, whereby the receiving members 16A and 16B are rubbed against the side surface of the column 12 Join.

  Next, as shown in FIG. 2, jacks 18A and 18B are installed on the footing 26, and the receiving members 16A and 16B are supported by the jacks 18A and 18B, respectively.

  Next, as shown in FIG. 4, the anchor nut 36 that fixes the column 12 to the footing 26 is loosened and removed.

  Next, as shown in FIG. 4, the jacks 18 </ b> A and 18 </ b> B are operated to jack up the receiving members 16 </ b> A and 16 </ b> B, and the pillar 12 is lifted to partially raise the building 10.

  Next, as shown in FIG. 5, the gap S (see FIG. 4) between the base plate 28 and the joining plate 34 formed by lifting the column 12 is closed with a mortar, a spacer member, or the like. FIG. 5 shows an example in which the gap S is closed by two steel plates 52 as spacer members.

  Next, as shown in FIG. 5, the anchor nut 36 is screwed into the male screw portion 30 of the anchor member 32, and the jacks 18 </ b> A and 18 </ b> B are gradually returned (shrinked) while tightening the anchor nut 36, thereby joining to the base plate 28. The plate 34 is joined, and the lower end portion of the column 12 is fixed to the footing 26. And after fixation of the lower end part of the pillar 12 to the footing 26 is completed, the jacks 18A and 18B are removed, and the receiving members 16A and 16B are removed from the pillar 12.

  Next, the operation and effect of the building raising structure according to the embodiment of the present invention will be described.

  In the building raising structure 14 of the present embodiment, as shown in FIG. 2, the receiving members 16 </ b> A and 16 </ b> B are joined to the column 12 by the high-strength bolts 20 as rod-shaped members, so that the receiving members 16 </ b> A and 16 </ b> B are attached to the column 12. In addition, a through hole 48 having a small diameter through which the high-strength bolt 20 passes may be provided on the side surface of the column 12 (an opening hole having a size sufficient to penetrate the receiving members 16A and 16B needs to be formed in the column 12). Absent). Therefore, the cross-sectional defect | deletion of the pillar 12 can be made small and the strength reduction of the pillar 12 can be reduced. That is, it is possible to reduce the strength reduction of the pillar 12 that occurs to raise the building 10.

  Further, since the main processing applied to the pillar 12 for attaching the receiving members 16A and 16B is only the formation of the through hole 48, the labor of the processing applied to the pillar 12 for attaching the receiving members 16A and 16B can be reduced. it can.

  Furthermore, the receiving members 16 </ b> A and 16 </ b> B can be attached to the pillar 12 when the building 10 is raised. Therefore, when building the building 10, it is not necessary to provide the receiving members 16 </ b> A and 16 </ b> B on the pillar 12 in advance, so that the initial cost in building the building 10 can be reduced.

  Further, in the building raising structure 14 of the present embodiment, as shown in FIG. 2, by joining the receiving members 16 </ b> A and 16 </ b> B to the web surface of the column 12, the flanges 40 and 42 have a great influence on the strength of the column 12. Since it is not necessary to provide a through hole, the strength reduction of the pillar 12 can be further reduced.

  Furthermore, in the building raising structure 14 of the present embodiment, by placing the receiving members 16A and 16B on the left and right sides of the pillar 12, the bending moment generated on the joint surface between the pillar 12 and the receiving members 16A and 16B is suppressed, Since the receiving members 16A and 16B can be jacked up with a good balance between the left and right, the pillar 12 can be lifted smoothly.

  The embodiment of the present invention has been described above.

  In the present embodiment, as shown in FIG. 1, an example in which a column 12 made of H-shaped steel is used as a column to be lifted by jacks 18 </ b> A and 18 </ b> B in order to raise the building 10. It may be made of a steel column, and may be made of a shape steel such as a square steel pipe or a C-shaped steel.

  The plan view of FIG. 6 shows an example of a building raising structure 80 in which receiving members 16A and 16B are attached to a column 12 made of a square steel pipe. Bolts 54 as rod-like members are attached to a plurality of through holes 50A, 50B formed in the flanges 46A, 46B of the receiving members 16A, 16B and a pair of through holes 84A, 84B respectively provided on the left and right side surfaces of the column 12. By passing the bolts 54 through the columns 12 and screwing and tightening the nuts 56 to the bolts 54, the flanges 46A and 46B of the receiving members 16A and 16B are frictionally joined to the side surfaces of the columns 12. 16B is joined to the side surface of the column 12.

  Further, in the present embodiment, as shown in FIG. 2, the example in which the receiving members 16 </ b> A and 16 </ b> B are arranged and attached to the left and right of the column 12 has been shown, but the receiving members are arranged and attached to both the left and right of the column 12. Alternatively, it may be arranged and attached to the left or right side of the pillar 12. If the receiving member is arranged and attached to one of the left and right sides of the column 12, it is possible to reduce the trouble of attaching the receiving member and the time of installing the jack.

  Furthermore, in this embodiment, as shown in FIG. 2, the receiving members 16A and 16B are frictionally joined to the column 12 by pressing the joining surfaces of the flanges 46A and 46B of the receiving members 16A and 16B against the web surface of the column 12. However, the flanges 46A and 46B may have other configurations as long as the through holes 48 that allow the high-strength bolts 20 to pass therethrough are formed and can be frictionally bonded to the web surface of the column 12. Good. For example, as shown in the front view of FIG. 7, the joining surfaces of steel flanges 62A and 62B provided between the upper flanges 58A and 58B ends of the receiving beams 44A and 44B and the lower flanges 60A and 60B ends. Is pressed against the web surface of the column 12 so that the receiving members 16A and 16B may be frictionally joined to the side surface of the column 12, or, for example, as shown in the front view of FIG. 8, the receiving beams 44A and 44B. By pressing the joining surfaces of the flanges 64A and 64B provided on the upper surface of the upper flanges 58A and 58B and the lower surfaces of the lower flanges 60A and 60B against the web surface of the column 12, the receiving members 16A and 16B are Friction bonding may be performed on the side surface of the column 12.

  Moreover, in this embodiment, as shown in FIG. 2, although the example which joined receiving member 16A, 16B to the web 38 surface of the pillar 12 was shown, like the building raising structure 82 shown in the top view of FIG. The receiving members 16 </ b> A and 16 </ b> B may be joined to the flange surfaces of the flanges 40 and 42 of the column 12. If the receiving members 16A and 16B are joined to the flange surface of the column 12, the pushing force of the jacks 18A and 18B can be reliably transmitted from the members 16A and 16B to the column 12.

  Furthermore, in this embodiment, as shown in FIG. 2, the rod-shaped member which joins receiving member 16A, 16B to the side surface of the pillar 12 was shown as the high strength bolt 20, However, A rod-shaped member is receiving member 16A, 16B. Is a rod-like member that resists the shearing force generated on the contact surface where the side surface of the column 12 and the bonding surfaces of the flanges 46A and 46B of the receiving members 16A and 16B are in contact with each other. As long as the joint surfaces of the flanges 46 </ b> A and 46 </ b> B can be pressed against the side surfaces of the flanges 46, 46. For example, the rod-shaped member may be a PC steel rod.

  Further, in the present embodiment, as shown in FIG. 2, the receiving members 16 </ b> A and 16 </ b> B are pressed against the web surface of the column 12 by pressing the joining surfaces of the flanges 46 </ b> A and 46 </ b> B of the receiving members 16 </ b> A and 16 </ b> B. Although the example which carries out friction welding was shown, when the web surface (side surface) of the column 12 and the contact surface of receiving member 16A, 16B (when the side surface of the column 12 and receiving member 16A, 16B are friction-bonded by the high strength volt | bolt 20). A surface treatment for increasing the friction coefficient of the contact surface may be performed on at least one of the side surface of the pillar 12 to be pressed and the friction surface between the joint surfaces of the flanges 46A and 46B. Here, increasing the friction coefficient of the contact surface means that the friction coefficient of the contact surface after the surface treatment is made larger than the friction coefficient of the contact surface before the surface treatment. For example, red rust generation treatment, shot blasting treatment, aluminum spraying, adhesive coating and the like can be mentioned.

  If it does in this way, the frictional resistance (slip resistance) of a contact surface can be enlarged, and the joining strength of the pillar 12 and receiving member 16A, 16B can be raised. For example, in the case of surface treatment by aluminum spraying, the friction coefficient of the contact surface can be increased to about 0.45 or more and 0.7 or less.

  Further, the surface of the pillar 12 and the contact surface of the receiving members 16A and 16B are subjected to a surface treatment for increasing the friction coefficient of the contact surface, thereby joining the pillar 12 and the receiving members 16A and 16B. Since the strength can be increased, the number of high-strength bolts 20 can be reduced. Thereby, since the number of the through holes 48 through which the high-strength bolts 20 are penetrated can be reduced, the labor of the column 12 for attaching the receiving members 16A and 16B to the column 12 can be reduced, and the strength of the column 12 can be reduced. Reduction can be further reduced.

  Furthermore, in this embodiment, although the example which lifts the pillar 12 supported on the footing 26 used as an independent footing foundation with the jacks 18A and 18B was shown, the building raising structure 14 of this embodiment has other types of foundations and You may apply, when lifting the pillar supported on various support parts, such as the ground.

  Moreover, when the column 12 lifted by the building raising structure 14 of the present embodiment is reinforced by the brace member, it is preferable to use a brace member whose axial length can be adjusted. If it does in this way, it can be made to correspond to the length of the brace member which changes with lifting of pillar 12 by building raising structure 14.

  For example, as shown in the front view of FIG. 10, length adjustment mechanisms 66A and 66B are provided, and the pillars 12 are formed by brace members 68A and 68B whose lengths in the axial direction can be adjusted by the length adjustment mechanisms 66A and 66B. If reinforced, the brace member 68A is shortened by the length adjusting mechanism 66A (arrow 72) and the length is adjusted when the left pillar 12 is lifted by the building raising structure 14 (not shown) (arrow 70). By lengthening the brace member 68B by the mechanism 66B (arrow 74), it is possible to correspond to the lengths of the brace members 68A and 68B that change as the column 12 is lifted.

  Furthermore, when an inner wall such as an inner wall or a partition wall facing the outer wall is provided on the soil between the buildings 10 raised by the building raising structure 14 of the present embodiment, as shown in the front view of FIG. In addition, it is preferable that the inner wall 76 is provided so as to stand on the dirt 78 so as not to contact the pillars 12 and beams (not shown) lifted by the building raising structure 14. In this way, when the pillar 12 is lifted by the building raising structure 14, the inner wall 76 can be prevented from being deformed or damaged.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10 Building 12 Column 14, 80, 82 Building raising structure 16A, 16B Receiving member 18A, 18B Jack 20 High strength bolt (bar-shaped member)
38 Web 48, 84A, 84B Through hole 54 Bolt (bar-shaped member)

Claims (3)

A receiving member disposed on the side of a steel pillar provided in the building;
A rod-shaped member that is penetrated through a through-hole provided in the side surface and frictionally joins the receiving member to the side surface;
A jack that raises the building by jacking up the receiving member and lifting the pillar;
Building raising structure with.   The building raising structure according to claim 1, wherein at least one of the side surface and the contact surface of the receiving member is subjected to a surface treatment for increasing a friction coefficient of the contact surface.   The building raising structure according to claim 1 or 2, wherein the column is made of H-shaped steel, and the receiving member is joined to a web surface of the H-shaped steel.