JP2019039221A - Jack-up method - Google Patents

Abstract

To reduce the time and effort of temporarily installing support members.SOLUTION: A jack-up method is provided in which a temporary support column 40 is attached to the existing column 20 erected on a lower structure 12 to support an upper structure 30, the upper structure 30 is jacked-up by a jack 42 provided on the temporary support column 40, the upper structure 30 is jacked up by the jacks 42 in a state where the existing column 20 is separated from the lower structure 12 and the existing column 20 and the temporary support column 40 are connected so as to be relatively displaceable in the vertical direction by a connection band 50.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a jack-up method.

  A seismic isolation method is known in which existing structures are separated into a lower structure and an upper structure, and the upper structure is jacked up, and a seismic isolation device is installed between the lower structure and the upper structure. (For example, refer to Patent Documents 1 to 3).

JP 2005-26469 A JP 2001-032533 A JP 2001-193289 A

  By the way, it is conceivable to provide a jack on the temporary support column.

  However, when a jack is provided on the temporary support column, a support member for suppressing the collapse of the temporary support column is required. This temporary work of the support member takes time.

  The present invention has been made in consideration of the above-mentioned facts, and an object of the present invention is to reduce the labor of temporary work of a support member.

  The jack-up method according to claim 1, wherein a temporary support is provided on an existing pillar that stands on the lower structure and supports the upper structure, and the upper structure is attached by a jack provided on the temporary support. A jack-up method for jacking up, wherein the existing column is separated from the lower structure, and the existing column and the temporary column are connected to each other in a vertically displaceable manner by a connecting member. Jack up the upper structure.

  According to the jackup method of the first aspect, the temporary support column is connected to the existing column by the connecting member, and is supported by the existing column through the connecting member. That is, the existing pillar functions as a support member that suppresses the falling of the temporary support column. Thereby, the number of the support members which suppress the fall of the temporary support column is reduced. Therefore, it is possible to reduce the trouble of temporary work of the support member.

  Further, the existing pillar is separated from the lower structure. Thereby, when the upper structure is jacked up by the jack, the existing pillar rises integrally with the upper structure. Therefore, the damage etc. of the existing pillar are suppressed.

  Moreover, a connection member connects the existing pillar and the temporary support | pillar so that relative displacement is possible to an up-down direction. Thereby, when the upper structure is jacked up by the jack, the connecting member does not hinder the rise of the existing pillar. Therefore, damage to the connecting member is suppressed.

  The jack-up method according to claim 2 is the jack-up method according to claim 1, wherein the connecting member is fixed to the temporary column and is slidably connected to the existing column in the vertical direction. The upper structure is jacked up by the jack while sliding the existing column upward with respect to the connecting member.

  According to the jack-up method of the second aspect, the connecting member is fixed to the temporary support column and is connected to the existing column so as to be slidable in the vertical direction. In this state, when the upper structure is jacked up by the jack, the existing pillar slides upward with respect to the connecting member. Thereby, the breakage of the connecting member is suppressed.

  A jackup method according to a third aspect is the jackup method according to the second aspect, wherein a sliding member is provided on a surface of the connecting member facing the existing column.

  According to the jack-up method of the third aspect, the sliding member is provided on the surface of the connecting member that faces the existing column. Thereby, when the upper structure is jacked up by the jack, the existing column is easily slid upward with respect to the connecting member. Therefore, the upper structure can be easily jacked up by the jack.

  As described above, according to the jackup method according to the present invention, it is possible to reduce the labor of temporary work of the support member.

It is an elevational view showing a structure to which the jackup method according to an embodiment is applied. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 2 is an elevation view showing a state where the upper structure shown in FIG. 1 is jacked up. It is an elevation view which shows the state which joined the lower end part of the existing pillar shown by FIG. 4 to the lower structure. It is an elevation view which shows the structure to which the modification of the jackup method which concerns on one Embodiment is applied. It is an elevation view which shows the structure to which the modification of the jackup method which concerns on one Embodiment is applied.

  Hereinafter, a jack-up method according to an embodiment will be described with reference to the drawings.

(Existing structure)
First, the structure of the existing structure 10 to which the jackup method according to the present embodiment is applied will be described.

  As shown in FIG. 1, the existing structure 10 includes a lower structure 12, an existing pillar 20, and an upper structure 30. The lower structure 12 is, for example, a slab such as a basic slab or a soil slab. An existing pillar 20 is erected on the lower structure 12. Note that the lower structure 12 is not limited to a slab, and may be a beam, a column, a foundation, or the like.

  The existing column 20 is formed of a square steel pipe. A base plate 22 is provided at the lower end of the existing pillar 20. The base plate 22 is fixed to the upper end portion of the existing anchor member 24 protruding upward from the upper surface of the lower structure 12 by a nut 26. Thereby, the existing pillar 20 is joined to the lower structure 12.

  The upper end of the existing column 20 is joined (rigidly joined) to the upper structure 30. The upper structure 30 is supported by the existing pillar 20. Although not shown, the upper structure 30 is supported by a plurality of existing pillars 20.

  The upper structure 30 is, for example, a housing on the upper floor of the existing pillar 20 or a crossing corridor that connects two buildings (not shown). The upper structure 30 is provided on the existing pillar 20. The upper structure 30 and the lower structure 12 are arranged to face each other in the vertical direction. A space 14 is formed between the upper structure 30 and the lower structure 12.

  Next, the structure of the temporary support column 40 and the pair of connecting bands 50 used for jacking up the upper structure 30 will be described.

(Temporary column)
The temporary support column 40 is temporarily attached to the existing pillar 20 when the upper structure 30 is jacked up. The temporary support column 40 includes a lower column portion 40L and an upper column portion 40U. The lower column portion 40L and the upper column portion 40U are formed of a square steel pipe. The lower column portion 40L is longer than the upper column portion 40U. A jack 42 is provided between the lower column portion 40L and the upper column portion 40U.

  The jack 42 is, for example, a hydraulic jack, and is provided on the upper portion of the existing pillar 20. Further, the jack 42 is disposed between the lower column portion 40L and the upper column portion 40U with the expansion / contraction direction as the vertical direction. The jack 42 takes up a reaction force on the lower column part 40L and the lower structure 12, and pushes the upper structure 30 upward.

(Linked band)
The temporary support column 40 is connected to the existing pillar 20 by a pair of upper and lower connection bands 50. The pair of connecting bands 50 are arranged at an interval in the vertical direction. One end side of each connecting band 50 is fixed to the lower column portion 40L of the temporary support column 40, and extends from the lower column portion 40L to the existing column 20 side. In other words, each connecting band 50 is supported in a cantilevered manner on the lower column portion 40L.

  On the other end side of each connecting band 50, a slide connecting portion 50A is provided. 50 A of slide connection parts are connected with the existing pillar 20 so that a slide to an up-down direction is possible. By the pair of connection bands 50, the temporary support column 40 and the existing column 20 are connected so as to be relatively displaceable in the vertical direction.

  Specifically, as shown in FIG. 2, the connecting band 50 includes a band main body 52, a pair of brackets 54, and a partition member 56. The band main body 52 is formed by joining a plurality of L-shaped steels, for example. Moreover, the closed cross-sectional shape of the band main body 52 is made into the U-shape (U-shape) by which the temporary support | pillar 40 side was opened.

  Both ends of the band main body 52 on the temporary support column 40 side are fixed to the temporary support column 40 via a pair of brackets 54. The pair of brackets 54 are, for example, angles, and are fixed to the band body 52 and the temporary support column 40 by welding or the like. The band main body 52 may be detachably fixed to the temporary support column 40 with, for example, a bolt or the like.

  The band main body 52 has a pair of both-side restraint portions 52S and a rear restraint portion 52R. As shown in FIGS. 2 and 3, the pair of both-side restraint portions 52 </ b> S face each other in an orthogonal direction (arrow Y direction) orthogonal to the facing direction (arrow X direction) between the existing column 20 and the temporary support column 40. Are arranged.

  The pair of both side restraint portions 52S is formed in a wall shape. In addition, the pair of both-side restraint portions 52 </ b> S are disposed on both sides in the orthogonal direction with respect to the existing column 20, and face the side surfaces of the existing column 20. The pair of both side restraint portions 52 </ b> S restrains (limits) the movement of the temporary support column 40 in the orthogonal direction with respect to the existing pillar 20. Moreover, the rear side restraint part 52R is spanned by the edge part by the side of the existing pillar 20 of a pair of both side restraint part 52S.

  As shown in FIG. 2, the rear restraint portion 52 </ b> R is formed in a wall shape. Moreover, the rear side restraint part 52R is arrange | positioned on the opposite side to the temporary support | pillar 40 with respect to the existing pillar 20, and connects the edge part by the side of the existing pillar 20 of a pair of both-sides restraint part 52S. The rear restraint portion 52R faces the partition member 56 with the existing column 20 interposed therebetween.

  The partition member 56 is formed of L-shaped steel, and is disposed on the temporary column 40 side with respect to the existing column 20. Further, both end portions of the partition member 56 are detachably joined to the pair of both side restraint portions 52S by bolts 58 and nuts 59. A pair of both side restraint portions 52S are connected by the partition member 56. Moreover, the partition member 56 has the front side restraint part 56F. Note that the partition member 56 may be joined to the pair of both-side restraint portions 52S by welding or the like.

  The front restraint portion 56F is formed in a wall shape. The front side restraint portion 56F and the rear side restraint portion 52R are arranged to face each other in the facing direction (arrow X direction) of the existing column 20 and the temporary support column 40. Further, the front side restraint portion 56F and the rear side restraint portion 52R are disposed on both sides of the existing column 20 in the facing direction of the existing column 20 and the temporary support column 40, and face the side surfaces of the existing column 20. The movement in the facing direction of the temporary column 40 with respect to the existing column 20 is restricted (restricted) by the rear side restriction portion 52R and the front side restriction portion 56F.

  Further, the rear side restraint portion 52R, the front side restraint portion 56F, and the pair of both side restraint portions 52S form a cylindrical slide coupling portion 50A that surrounds the existing column 20. The slide connecting portion 50 </ b> A is slidable in the vertical direction along the existing pillar 20. The connection band 50 is an example of a connection member.

(Sliding material)
A sliding material 60 is provided on the surface of the connection band 50 facing the existing pillar 20. Specifically, the sliding material 60 is provided on the surface of each of the pair of both side restraint portions 52S, the rear side restraint portion 52R, and the front side restraint portion 56F facing the side surfaces of the existing pillars 20, respectively. As the sliding material 60, for example, a low friction material such as an insulating sheet, a stainless plate, or a paint is used.

  In addition, the sliding material 60 can be provided in at least one of a pair of both-side restraint part 52S, the rear side restraint part 52R, and the front side restraint part 56F. Further, the sliding material 60 can be omitted as appropriate.

(Jack-up method)
Next, the jackup method according to the present embodiment will be described.

  The existing structure 10 is positioned below a predetermined position due to settlement such as an earthquake. In the present embodiment, the upper structure 30 is jacked up by the jack 42 in order to return the upper structure 30 to a predetermined position before sinking. This jack-up method includes a temporary support column installation step, an existing column separation step, a jack-up step, and an existing column joining step.

(Temporary strut installation process)
First, the temporary support | pillar installation process is demonstrated. In the temporary support column installation step, the temporary support column 40 is provided alongside the existing column 20. Specifically, the temporary support column 40 is erected on the lower structure 12. Next, the jack 42 is operated, the upper end portion of the upper column portion 40U of the temporary support column 40 is brought into contact with the lower surface of the upper structure 30, and the temporary support column 40 is self-supported between the lower structure 12 and the upper structure 30. .

  Next, the existing pillar 20 and the temporary support column 40 are connected by the pair of connecting bands 50 so as to be relatively displaceable in the vertical direction. Specifically, first, the existing pillar 20 is inserted into the band main body 52 of the connecting band 50, and the band main body 52 is disposed around the existing pillar 20.

  In this state, the end of the band main body 52 on the temporary support column 40 side is fixed to the temporary support column 40 via a pair of brackets 54 by welding or the like. Moreover, the partition member 56 is arrange | positioned inside the band main body 52, and the both ends of the partition member 56 are joined to a pair of both-side restraint part 52S with the volt | bolt 58 and the nut 59, respectively. As a result, the band main body 52 and the partition member 56 form a slide connection portion 50 </ b> A that surrounds the existing pillar 20.

(Existing pillar separation process)
Next, the existing column separation process will be described. In the existing column separation step, the existing column 20 is separated from the lower structure 12. Specifically, as shown in FIG. 1, the nut 26 is removed from the existing anchor member 24 for the base plate 22. Thereby, joining with the lower structure 12 and the existing pillar 20 is cancelled | released.

  In addition, you may perform the existing pillar isolation | separation process before and after a temporary support | pillar installation process, or in parallel with a temporary support | pillar installation process.

(Jack-up process)
Next, the jackup process will be described. In the jack-up process, the jack 42 provided on the temporary support column 40 is operated to extend the jack 42. As a result, as shown in FIG. 4, the upper structure 30 is pushed up by the jack 42 and the upper column portion 40 </ b> U, and the upper structure 30 is raised with respect to the lower structure 12. The upper structure 30 is raised to a predetermined position by the jack 42.

  At this time, the existing column 20 rises integrally with the upper structure 30 and slides upward with respect to the slide coupling portion 50 </ b> A of the pair of coupling bands 50. As a result, a gap is formed between the base plate 22 of the existing pillar 20 and the lower structure 12.

(Existing column joining process)
Next, the existing column joining process will be described. In the existing column joining step, the existing column 20 is joined to the lower structure 12 as shown in FIG. Specifically, the extension anchor member 29 is connected to the existing anchor member 24 via the connector 28, and the extension anchor member 29 is passed through a through hole (not shown) formed in the base plate 22. In this state, the base plate 22 is fixed to the existing anchor member 24 by tightening the nut 26 to the upper end portion of the extension anchor member 29.

  Next, concrete 16 is placed between the base plate 22 of the existing pillar 20 and the upper surface of the lower structure 12. Thereby, the existing pillar 20 and the lower structure 12 are joined, and the upper structure 30 is supported by the existing pillar 20.

  Thereafter, the temporary support column 40 and the pair of connecting bands 50 are removed.

(Function)
Next, the operation of this embodiment will be described.

  According to the jack-up method according to the present embodiment, the temporary support column 40 is connected to the existing column 20 by the pair of connection bands 50 and is supported by the existing column 20 through the pair of connection bands 50. That is, the existing pillar 20 functions as a support member that suppresses the collapse of the temporary support column 40. Thereby, the support member which suppresses the fall of the temporary support | pillar 40 becomes unnecessary. Therefore, it is possible to reduce the trouble of temporary work of the support member.

  Further, the existing pillar 20 is separated from the lower structure 12 in the existing pillar separation step. Thereby, when the upper structure 30 is jacked up by the jack 42, the existing pillar 20 rises integrally with the upper structure 30. Therefore, the damage etc. of the existing pillar 20 are suppressed.

  Further, one end side of the connection band 50 is fixed to the temporary support column 40. On the other hand, the other end side of the connection band 50 can be displaced relative to the existing pillar 20 in the vertical direction via the slide connection portion 50A. Therefore, when the upper structure 30 is jacked up by the jack 42, the existing pillar 20 slides upward with respect to the pair of connection bands 50. That is, the pair of connecting bands 50 does not hinder the rise of the existing pillar 20. Therefore, damage to the pair of connecting bands 50 is suppressed.

  Further, a sliding material 60 is provided on a surface of the pair of connecting bands 50 facing the existing pillar 20. Thereby, when the upper structure 30 is jacked up by the jack 42, the existing pillar 20 is easily slid upward with respect to the connection band 50. Therefore, the upper structure 30 can be easily jacked up by the jack 42.

(Modification)
Next, a modification of the above embodiment will be described.

  In the said embodiment, although the connection band 50 is fixed to the temporary support | pillar 40, the said embodiment is not restricted to this. For example, as in the modification shown in FIG. 6, the connection band 50 may be fixed to the existing pillar 20. In this case, the slide connection portion 50A of the connection band 50 is connected to the temporary support column 40 so as to be relatively displaceable in the vertical direction.

  Moreover, it is also possible to fix one connection band 50 to the temporary support column 40 and fix the other connection band 50 to the existing column 20 among the pair of connection bands 50. Further, the existing pillar 20 and the temporary support column 40 can be connected by at least one connecting band 50. Further, the connecting member is not limited to the connecting band 50, and the configuration thereof can be changed as appropriate.

  Moreover, in the said embodiment, although the one temporary support | pillar 40 is attached to the existing pillar 20, the said embodiment is not restricted to this. The existing column 20 may be provided with a plurality of temporary columns. For example, in the modification shown in FIG. 7, a pair of temporary columns 40 are provided on both sides of the existing column 20.

  The pair of temporary columns 40 and the existing columns 20 are connected via a pair of upper and lower connection bands 70. Both end portions 70A of each connection band 70 are fixed to a pair of temporary columns 40, respectively. Further, a slide connecting portion 70B is provided at an intermediate portion of each connecting band 70, and this slide connecting portion 70B is connected to the existing column 20 so as to be relatively displaceable in the vertical direction. Thereby, the effect similar to the said embodiment can be acquired.

  Moreover, in the said embodiment, although the jack 42 is provided in the upper part of the temporary support | pillar 40, the said embodiment is not restricted to this. The arrangement of the jack 42 with respect to the temporary support column 40 can be changed as appropriate, and the jack may be provided, for example, under the temporary support column.

  Moreover, in the said embodiment, although the jack 42 is provided between the upper side pillar part 40U and the lower side pillar part 40L, the said embodiment is not restricted to this. For example, the temporary support column may be formed by a single column member, and a jack may be provided at the upper end portion or the lower end portion of the column member.

  Moreover, in the said embodiment, although the temporary support | pillar 40 is not supported by the support member different from the existing pillar 20, the temporary support | pillar 40 may be supported by the support member. In this case, the number of support members can be reduced compared to the case where the temporary support column 40 and the existing column 20 are not connected by the connection band 50.

  Moreover, in the said embodiment, the existing pillar 20 was isolate | separated from the lower structure 12 by cancel | disconnecting the base plate 22 and the existing anchor member 24 of the existing pillar 20, However, The said embodiment is not restricted to this. For example, the existing column may be cut at the column base. In this case, the cutting part of the existing pillar may be joined via a backing plate or the like after jacking up, or may be joined via root winding concrete.

  Moreover, in the said embodiment, although the existing pillar 20 and the temporary support | pillar 40 are formed with a square steel pipe, the said embodiment is not restricted to this. The existing column and the temporary column may be formed of, for example, an H-shaped steel, a C-shaped steel, a round shape, or the like.

  Further, the existing column 20 is not limited to a steel structure, and may be a reinforced concrete structure, a steel reinforced concrete structure, or the like. In addition, the shape of a connection member can be suitably changed according to the shape of the existing pillar or temporary support | pillar.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

12 Lower structure 20 Existing pillar 30 Upper structure 40 Temporary support 42 Jack 50 Connection band (connection member)
70 Connection band (connection member)

Claims (3)

A jack-up method in which a temporary support is provided on an existing column that stands on the lower structure and supports the upper structure, and the upper structure is jacked up by a jack provided on the temporary support,
The existing pillar is separated from the lower structure, and the upper structure is jacked up by the jack in a state where the existing pillar and the temporary support pillar are connected to each other in a vertically movable manner by a connecting member.
Jack up method. The connecting member is fixed to the temporary support column and connected to the existing column so as to be slidable in the vertical direction,
Jacking up the upper structure with the jack while sliding the existing pillar upward relative to the connecting member;
The jackup method according to claim 1. A sliding material is provided on the surface of the connecting member facing the existing pillar,
The jack-up method according to claim 2.