JP2018003559A - Column-beam frame repairing method and repaired column-beam frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column-beam frame repairing method that enables adjustment of a stress state of an existing beam, and a repaired column-beam frame.SOLUTION: A column-beam frame repairing method includes the steps of: removing an existing column (column 12) within an existing column-beam frame 10; constructing an auxiliary beam 24 within the column-beam frame 10; installing a jack member 32 between an undersurface of an existing beam (beam 14) of the column-beam frame 10 and the auxiliary beam 24; and jacking up the existing beam by the jack member 32.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a column beam frame repair method and a repaired column beam frame.

  Patent Literature 1 below discloses a method for reinforcing a column beam frame when removing an intermediate column that supports the beam of the column beam frame. In this reinforcing method, the intermediate column is removed leaving the top portion of the beam, and the top portion is sandwiched between a pair of arch members supported by the accessory column. As a result, the load received by the beam is transmitted from the top of the intermediate column to the accessory column via the arch member, thereby suppressing the deformation of the beam.

JP 2010-37746 A

  However, even if the load received by the beam is received by the arch member, it is difficult to adjust the stress state of the beam because the arch member is only placed under the beam, and it is difficult to suppress the deformation of the beam.

  Moreover, it is difficult to store such an arch member in a ceiling space with a small vertical height. For this reason, it is necessary to expose the arch member without providing the ceiling space, or to increase the height of the ceiling space. In other words, the method for reinforcing a column beam structure in Patent Document 1 has a large restriction for suppressing the deformation of the beam.

  In view of the above facts, an object of the present invention is to provide a column beam frame repair method and a repaired column beam frame that can adjust the stress state of an existing beam.

  The method of repairing a column beam frame according to claim 1 includes a step of removing an existing column in an existing column beam frame, a step of constructing an auxiliary beam in the column beam frame, and a lower surface of the existing beam of the column beam frame And a step of installing a jack member between the auxiliary beam and a step of jacking up the existing beam with the jack member.

  According to the column beam frame repairing method of the first aspect, the existing beam can be jacked up with the jack member as the auxiliary beam receiving base. For this reason, even if the existing column is removed, the stress state of the existing beam can be adjusted by jacking up the existing beam, and the state before the removal can be restored.

  The column beam frame repair method according to claim 2 includes a step of installing a load transmission member between the lower surface of the existing beam and the auxiliary beam after jacking up the existing beam.

  According to the column beam frame renovation method of the second aspect, the load received by the jack member can be stored in the load transmission member. For this reason, a jack member can be removed and diverted.

  In the column beam frame repair method according to a third aspect of the present invention, two auxiliary beams are extended along a side surface of the existing beam, and the jack member is installed on a connecting beam connecting the auxiliary beams.

  According to the column beam frame repairing method of the third aspect, two auxiliary beams are installed along the side surface of the existing beam. For this reason, compared with the case where an auxiliary beam is arrange | positioned under the existing beam, the space under a beam can be made high. Moreover, the member dimension per auxiliary beam can be reduced.

  The repaired column beam frame of claim 4 is provided between an existing column beam frame, an auxiliary beam provided in the column beam frame, a lower surface of the existing beam of the column beam frame, and the auxiliary beam, And a lifting member fixed in a state where the existing beam is lifted.

  According to the modified column beam frame of the fourth aspect, the existing beam can be lifted by the lifting member as a support beam. Thereby, the stress state of the existing beam can be adjusted, and the deformation of the beam accompanying an increase in the load load and the deformation of the beam when the column is removed can be suppressed.

  According to the column beam frame repair method and the modified column beam frame according to the present invention, the stress state of the existing beam can be adjusted.

(A) is the top view which showed the repaired column beam frame concerning 1st Embodiment of this invention, (B) is the BB sectional drawing of (A). It is an elevation view which shows the column beam frame repair method which concerns on 1st Embodiment of this invention, (A) shows the state which installed the support under the beam, (B) shows the state which removed the existing column (C) has shown the state which installed the auxiliary frame over the removal part of the existing pillar. (A) is an elevational view showing a state in which a jack member is installed between an existing beam and an auxiliary beam in the column beam frame repairing method according to the first embodiment of the present invention, and (B) is (A) It is a BB line sectional view of). (A) is an elevational view showing a state in which a concrete member is installed between an existing beam and an auxiliary beam in the column beam frame repair method according to the first embodiment of the present invention, and (B) is (A) It is a BB line sectional view of). (A) is a method for repairing a column beam frame and a modified column beam frame according to the first embodiment of the present invention, in which stud bolts are respectively joined to an existing column and an auxiliary column, and concrete is provided between the existing column and the auxiliary column. FIG. 5B is an elevation view showing a state where the existing column and the auxiliary column are bolted together. (A) is a top view which shows the example which comprised the auxiliary | assistant structure in the cross in the column beam structure repair method and repaired column beam structure which concern on 1st Embodiment of this invention, (B) does not remove the existing pillar. FIG. 6C is a plan view showing an example in which an auxiliary frame is used, and FIG. 8C is an elevational view showing an example in which auxiliary columns are omitted and only auxiliary beams are used. (A) is the top view which showed the repaired column beam frame concerning 2nd Embodiment of this invention, (B) is the BB sectional drawing of (A). (A) is the plane enlarged view which shows the state which mounted the jack member between the existing beam and the connecting beam in the column beam frame repair method which concerns on 2nd Embodiment of this invention, (B) is (A) It is a BB line sectional view of).

[First Embodiment]
(Column beam structure)
As shown in FIGS. 1A and 1B, a column beam frame 10 to which the column beam frame repair method according to the first embodiment is applied includes a column 12 and a beam 14 spanned over the column 12. I have. 1B is a cross-sectional view taken along line BB shown in FIG. 1A, and FIG. 1A is a cross-sectional view taken along line AA shown in FIG. 1B.

  FIGS. 1A and 1B show a state after the column beam frame 10 has been repaired. As will be described in detail later, the column 12 is removed from the column beam frame 10 at the time of refurbishment (removal part 12E). However, it arrange | positions so that it may straddle the removal part 12E. Further, in the removal portion 12E, a concrete block 34 as a load transmission member that transmits the load received by the beam 14 to the auxiliary frame 20 between the lower surface of the beam 14 and the upper surface of the auxiliary beam 24 (see FIG. 1B). Is provided. In addition, the removal part 12E points out the whole part of the space where the pillar 12 existed before removal.

  1A and 1B, the pillars 12 are arranged at regular intervals, but the embodiment of the present invention is not limited to this, and the intervals may vary. Moreover, the removal part 12E is not restricted to arrangement | positioning as shown to FIG. 1 (A) and (B), For example, the adjacent pillar 12 may be removed and the removal part 12E may be arrange | positioned over multiple spans. Further, the auxiliary frame 20 is drawn along the X direction and the Y direction in FIG. 1A for easy understanding of the configuration, but along the X direction and the Y direction in any direction. Can be arranged.

  The column beam frame 10 is a frame on the lowest floor of a building having an underground floor, and the upper surface 16A of the foundation beam 16 that supports the column beam frame 10 is formed at a lower position than a groundwater level (not shown). Since the removal part 12E which removed the pillar 12 cannot press the foundation beam 16 strongly from the upper part to the downward | lower direction, compared with the part where the pillar 12 is not removed, the force which resists the water pressure P received upward from groundwater is weak. For this reason, the underground anchor 18 for resisting the hydraulic pressure P is driven toward the ground from the removal part 12E or the foundation beam 16 around the removal part 12E.

  If the groundwater level is lower than the upper surface 16A of the foundation beam 16, or if the water pressure P does not pose a problem in the structure of the building, the underground anchor 18 need not be provided. Further, the column beam frame 10 to which the column beam frame repair method is applied is not limited to the lowest floor of the building, and may be an arbitrary floor.

(Column beam frame repair method)
In order to perform the repair for removing the column 12 in the column beam frame 10, first, the lower surface 14A of the beam 14 supported by the column 12 to be removed and the upper surface of the foundation beam 16 are shown in FIG. A supporting work 90 as a temporary pillar is installed between 16A and the beam 14 is supported.

  Next, the pillar 12 is removed as shown in FIG. At this time, in order to make it easy to jack up the beam 14 with a jack member 32 to be described later, it is preferable that the column 12 is flatly suspended up to the lower surface of the beam 14.

  Next, as shown in FIG. 2C, the auxiliary frame 20 is installed along the beam 14 orthogonal to the beam 14 on which the support work 90 is installed. At this time, the auxiliary column 22 of the auxiliary frame 20 is erected from the upper surface 16 </ b> A of the foundation beam 16, and is arranged with a gap on the side of the column 12 of the column beam frame 10. The auxiliary beam 24 supported by the auxiliary column 22 is extended below the beam 14 of the column beam frame 10 with a gap. Thereby, the auxiliary beam 24 is arrange | positioned so that it may straddle the removal part 12E which removed the pillar 12 as shown to FIG. 1 (A). In addition, although the auxiliary column 22 and the auxiliary beam 24 are both formed of H-shaped steel, a square steel pipe, CT-shaped steel, a channel material, or the like may be used.

  Next, as shown in FIG. 3A, the jack member 32 is installed between the lower surface 14A of the beam 14 and the upper surface 24A of the auxiliary beam 24 in the removal portion 12E. As shown in FIG. 3B, which is a cross-sectional view taken along the line BB shown in FIG. 3A, the jack member 32 has a central portion of the removal portion 12E, that is, the removed column 12 (FIG. 2A). ))) At the position where the axial center line CL passes.

  Next, the beam 14 is jacked up by the jack member 32, the load received by the support 90 (see FIG. 2) from the beam 14 is changed to the jack member 32, and the support 90 is removed. When the beam 14 is jacked up by the jack member 32, the stress state of the beam 14 becomes the stress state before the column 12 is removed. The load received by the jack member 32 is transmitted to the auxiliary column 22 via the auxiliary beam 24. As the jack member 32, various structures such as a screw-type jack, a hydraulic jack, and an air jack can be used as long as the beam 14 can be jacked up.

  Next, as shown in FIGS. 4A and 4B, the concrete block 34 is installed between the lower surface 14A of the beam 14 and the upper surface 24A of the auxiliary beam 24 in the removal portion 12E. The concrete block 34 may be formed in advance in a predetermined size, or in a state where the beam 14 is jacked up by the jack member 32, a formwork is assembled around the jack member 32, and the lower surface 14A of the beam 14 is assembled. It may be formed by filling concrete between the upper surface 24A of the auxiliary beam 24 and hardening it. The concrete block 34 is preferably made of high-strength concrete in order to transmit the load received by the beam 14 to the auxiliary frame 20. Further, in place of the concrete block 34, non-shrink mortar, steel material, or the like can be used.

  Next, the jack member 32 is jacked down, the load that the jack member 32 receives from the beam 14 is changed from the jack member 32 to the concrete block 34, and the jack member 32 is removed. The repaired column beam frame is formed by the above process.

(Action / Effect)
According to the column beam frame repair method and the repaired column beam frame according to the first embodiment, the existing beam 14 can be jacked up by the jack member 32 using the auxiliary beam 24 as a pedestal. For this reason, even if the existing column 12 is removed, the stress state of the beam 14 can be adjusted and returned to the state before the column 12 is removed by jacking up the beam 14.

  That is, when the column 12 is removed, the beam 14 sinks (bends) due to the load on the upper floor in the removal portion 12E, but sinks by jacking up the beam 14 with the jack member 32 placed on the auxiliary beam 24. You can push back.

  Furthermore, even if the load capacity on the upper floor increases more than before due to a change in use, etc., when the building is renovated, if the force to push back the beam 14 is increased by jacking up, the load capacity can be increased. it can.

  For this reason, even if the existing pillar 12 is removed, the structural burden applied to the beam 14 supported by the removed pillar 12 can be reduced. Thereby, as shown to FIG. 1 (A), the columnless space V wider than before repair can be formed. Moreover, the pillar-free space V can be further widened by removing the pillars 12 adjacent to each other and providing the auxiliary frame 20 for each removed part.

  In the present embodiment, the jack member 32 can be removed by changing the load that the jack member 32 receives from the beam 14 from the jack member 32 to the concrete block 34. For this reason, the jack member 32 can be diverted to arbitrary uses.

  In addition, although the concrete block 34 is an example of the lifting member in this invention, the structure of a lifting member is not restricted to this.

  For example, the jack member 32 is not necessarily removed. When the jack member 32 is not removed, the load received from the beam 14 can be transmitted to the auxiliary beam 24 via the jack member 32, so that the concrete block 34 need not be installed. If the concrete block 34 is not installed, the construction labor is reduced. In this case, the jack member 32 is a lifting member.

  Alternatively, concrete may be cast on the periphery of the jack member 32 and the jack member 32 may be embedded in the concrete. By embedding the jack member 32 in the concrete, the beam 14 can be supported by the concrete even if the jack member 32 is broken. Alternatively, the beam 14 can be supported by the jack member 32 even when the concrete is destroyed. For this reason, the function which supports the beam 14 can be made redundant. Both the jack member 32 and the concrete serve as lifting members.

  Moreover, the jack member 32 is installed in the removal part 12E of the pillar 12 in this embodiment. When the column 12 is removed, the place where the deformation of the beam 14 becomes the largest is the removal portion 12E. By using the jack member 32 in the removal portion 12E, the beam 14 can be jacked up efficiently. .

  In addition, the jack member 32 can also be installed in parts other than the removal part 12E. For example, a plurality of jack members 32A shown by a two-dot chain line in FIG. 4B may be installed around the removal portion 12E. If a plurality of jack members are installed, the load from the beam 14 borne by one jack member can be reduced. For this reason, a jack member can be reduced in size. Moreover, the concrete block 34 installed in the removal part 12E can be largely formed by installing the jack member 32A around the removal part 12E and not installing it in the removal part 12E. For this reason, since the load per unit volume which the concrete block 34 bears is reduced, the intensity | strength of concrete can be made small.

  In the present embodiment, the auxiliary pillars 22 of the auxiliary frame 20 are arranged with a gap on the side of the columns 12 of the column beam frame 10. Thereby, the auxiliary pillar 22 and the auxiliary beam 24 are combined in advance to form the gate-type auxiliary frame 20, and this can be easily arranged by sliding it inside the existing column beam frame 10.

  As shown in FIG. 5A, the gap between the auxiliary column 22 and the column 12 may be filled with concrete. In this case, for example, the stud bolt 36 is welded to the side surface of the auxiliary column 22 on the column 12 side, and the stud bolt 36 is embedded also on the side surface of the column 12 on the auxiliary column 22 side, thereby acting on the auxiliary column 22 via concrete. The axial force and bending force to be transmitted can be transmitted to the column 12.

  Further, as shown in FIG. 5B, the auxiliary column 22 is brought close to the column 12 and the flange 22F of the auxiliary column 22 formed of H-shaped steel is fixed to the side surface of the column 12 with a bolt 38. May be. Even with such a configuration, the axial force and the bending force acting on the auxiliary column 22 can be transmitted to the column 12.

  In order to fix the stud bolt 36 and the bolt 38 to the pillar 12 in FIGS. 5A and 5B, for example, a post-construction anchor (not shown) may be embedded.

  In the present embodiment, the auxiliary frame 20 is a gate-type frame made up of auxiliary columns 22 and auxiliary beams 24. That is, the auxiliary frame 20 has a shape along the gate-shaped column beam frame 10 formed by the existing columns 12 and beams 14. For this reason, compared with the case where an arch member etc. are used for an auxiliary frame, the space for installing an auxiliary frame can be decreased, for example. Therefore, the plan impact on the renovated building can be reduced.

  In the present embodiment, the gate-shaped auxiliary frame 20 is disposed in the removal portion 12E, but the embodiment of the present invention is not limited to this. For example, as shown in FIG. 6A, a planar cross-shaped auxiliary frame 26 may be disposed along the beam 14 in the X direction and the Y direction with the removal portion 12E as the center. In the auxiliary frame 26, four auxiliary columns 26A are installed along the existing columns 12, and auxiliary beams 26B are bridged between auxiliary columns 26A adjacent to each other in the Y direction, and are supplemented from auxiliary columns 26A adjacent to each other in the X direction. An auxiliary beam 26C is bridged over the center of the beam 26B.

  Thereby, the auxiliary frame 26 can transmit the load received from the beam 14 to the four auxiliary columns 26A via the auxiliary beams 26B and 26C. Therefore, the auxiliary frame 26 can secure a ceiling height by reducing the member cross section compared to the auxiliary frame 20 (see FIG. 1).

  Further, in this embodiment, the column 12 is removed and the auxiliary frame 20 is arranged. However, the embodiment of the present invention is not limited to this, and the auxiliary frame 20 can be used even when the column 12 is not removed. . In the case where the auxiliary frame 20 is used in this way, for example, as shown in FIG. 6B, the span between the adjacent columns 12 is extended between the columns 12 in a portion where the span is longer than the other portions. The case where the bending of the beam 15 is suppressed is mentioned. At this time, for example, the central portion of the beam 15 is jacked up. As a result, even if a larger load is applied to a portion where the column span is longer than that of the other portion, a problem in structural strength hardly occurs. For this reason, a building can be renovated to an application (for example, a pool etc.) where a large area is required and a large load is applied.

  Moreover, in this embodiment, although the auxiliary | assistant frame 20 formed from the auxiliary pillar 22 and the auxiliary beam 24 is used, embodiment of this invention is not restricted to this. For example, as shown in FIG. 6C, the auxiliary beam 28 in which the auxiliary column is omitted and the end surface is fixed to the side surface of the column 12 may be used. That is, it does not have to function as a cradle for the jack member 32 for jacking up the beam 14 and be destroyed when the beam 14 is jacked up within an assumed stress range. By using a mechanism such as the auxiliary beam 28 that does not include an auxiliary column, necessary members can be reduced.

  Each of the modified examples shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C also has the same configuration in the column beam frame repair method and the repaired column beam frame according to the second embodiment shown below. Can be applied.

[Second Embodiment]
(Column beam structure)
As shown in FIGS. 7A and 7B, in the column beam frame repair method and the repaired column beam frame according to the second embodiment, the auxiliary frame 40 including the auxiliary column 42 and the auxiliary beam 44 is provided. Two sets are extended along the side surface of the beam 14. 7B is a cross-sectional view taken along the line BB shown in FIG. 7A, and FIG. 7A is a cross-sectional view taken along the line AA shown in FIG. 7B.

  Although the auxiliary frame 20 in the first embodiment is disposed across the removal portion 12E of the pillar 12, the auxiliary frame 40 in the second embodiment is disposed on both sides of the removal portion 12E, and the planar position is the same. I have not done it.

  As shown in FIG. 7A, the auxiliary pillars 42 are installed facing two opposing surfaces of the existing pillars 12, and as shown in FIG. A bracket 42A for joining 44 is welded. Note that the two opposing surfaces in the column 12 are two surfaces along the extending direction of the auxiliary frame 40 (X direction in FIG. 7A).

  As shown in FIG. 7B, the auxiliary beam 44 is a deformed beam whose both ends are joined to the bracket 42A of the auxiliary column 42 and whose center is deformed into a concave shape. More specifically, the auxiliary beam 44 has one end joined to the bracket 42A and joined to the upper step portion 44A extending along the side surface of the beam 14 and the other end of the upper step portion 44A via the intermediate member 44C. And a lower step portion 44B.

  The upper step portion 44A is formed of H-shaped steel, and the lower surface of the lower flange 44AH is formed so as to have the same height as the lower surface of the beam 14. The lower step portion 44B is also formed of H-shaped steel, and the upper flange 44BH is formed below the lower surface of the beam 14.

  As shown in FIGS. 8A and 8B, the two auxiliary beams 44 extending across the beam 14 are connected by a connecting beam 50 straddling the removal portion 12E. That is, the lower step portions 44 </ b> B are connected by the connecting beam 50. 8B is a cross-sectional view taken along the line BB shown in FIG. 8A, and FIG. 8A is a cross-sectional view taken along the line AA shown in FIG. 8B.

  Further, in the removal portion 12E, a concrete block 34 is provided between the lower surface of the beam 14 and the upper surface of the connecting beam 50 as a load transmission member that transmits the load received by the beam 14 to the auxiliary frame 40 via the connecting beam 50. It has been.

(Column beam frame repair method)
The column beam frame repair method according to the second embodiment is similar to the column beam frame repair method according to the first embodiment. First, as shown in FIGS. After that, the pillar 12 is removed. Thereafter, as shown in FIGS. 7A and 7B, the auxiliary frame 40 is installed along both side surfaces of the beam 14, and the two sets of auxiliary frames 40 are connected by the beam 50.

  Thereafter, as shown in FIGS. 8A and 8B, the jack member 32 is installed on the upper surface of the connecting beam 50, the beam 14 is jacked up, and the concrete block 34 is installed.

  As described above, in the second embodiment, the auxiliary frame 40 is disposed on both sides of the removal portion 12E along the side surface of the beam 14, and the removal portion 12E does not coincide with the planar position. For this reason, the auxiliary frame 40 can also be installed before the pillar 12 is removed or before the support 90 is installed.

(Action / Effect)
In the column beam frame repair method and the repaired column beam frame according to the second embodiment, as shown in FIG. Are formed. For this reason, even if the auxiliary frame 40 is installed in the column beam frame 10, it is possible to suppress the space under the beam from being lowered. As a result, even when the equipment pipe 92 or the like is arranged directly below the beam 14, the auxiliary beam 44 can be installed without interfering with the equipment pipe 92. Or it can suppress that ceiling height becomes low.

  Moreover, in the column beam frame repair method and the repaired column beam frame according to the second embodiment, two auxiliary beams 44 are installed for one removal portion 12E, and four auxiliary columns 42 are installed. For this reason, the burden load per each of the auxiliary beam 44 and the auxiliary column 42 can be reduced, and the member dimensions can be reduced. For this reason, since the weight per member can be made small, conveyance efficiency and construction efficiency can be made high.

  Moreover, in the column beam frame repair method and the repaired column beam frame according to the second embodiment, as described above, the auxiliary frame 40 and the removal portion 12E do not coincide with each other in a planar position. For this reason, the timing which installs the auxiliary frame 40 can be determined arbitrarily. Therefore, the flexibility of the construction plan is high.

  As described above, in the repair of the column beam frame 10, any one of the column beam frame repair method and the modified column beam frame of the first embodiment and the second embodiment can be used. Moreover, when there are a plurality of removal parts 12E, the first embodiment and the second embodiment can be appropriately selected and used for each removal part 12E. Further, these column beam frame repair methods and the modified column beam frame can be used to reinforce the column beam frame 10 when a new building is constructed.

10 Column-beam frame 12 Column (existing column)
24, 26B, 28, 44 Auxiliary beam 32 Jack member (lifting member)
34 Concrete block (load transmission member, lifting member)
50 Connecting beams

Claims (4)

Removing the existing pillars in the existing pillar beam structure;
Building an auxiliary beam in the column beam frame;
Installing a jack member between the lower surface of the existing beam of the column beam frame and the auxiliary beam;
Jacking up the existing beam with the jack member;
Column beam frame repair method with After jacking up the existing beam,
The column beam frame repair method according to claim 1, further comprising a step of installing a load transmission member between a lower surface of the existing beam and the auxiliary beam.   3. The column beam frame repair method according to claim 1, wherein two of the auxiliary beams are extended along a side surface of the existing beam, and the jack member is installed on a connecting beam connecting the auxiliary beams. 4. . An existing column beam structure,
Auxiliary beams provided in the column beam frame,
A lifting member provided between the lower surface of the existing beam of the column beam frame and the auxiliary beam and fixed in a state where the existing beam is lifted;
Refurbished pillar beam frame.