JP2019044552A - Original position building column method and original position building column structure - Google Patents

Abstract

To provide an original position building column method and an original position building column structure which eliminate need of securing a new land and a removal work of a foundation part when an existing column is replaced with a new column, and can reduce a construction time and a construction cost.SOLUTION: An original position building column method and an original position building column structure: cut and remove the upper part of an existing column; remain a foundation part including a setting part of the existing column at an original position; erect an anchor bolt on the upper surface of the foundation part; fix a new column having a column portion corresponding to the upper part of the existing column, a base plate on the lower part of the column portion and a core column part extending below the base plate in the internal center part below the column portion to the foundation part in a state where the core column part is inserted into the setting part and the base plate is adjusted to a predetermined attitude through the anchor bolt; and inject, fill and cure shrinkage-compensating mortar between the upper surface of the foundation part and the base plate and between the outer peripheral surface of the core column part and the inner peripheral surface of the setting part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a former position building column construction method and a former position building column structure in which a foundation portion of an existing column is reused to construct a new column when the existing column is to be rebuilt from the existing column.

  Until now, when rebuilding an existing pillar (such as a steel pipe pillar) such as a disaster prevention radio pillar or a signal pillar due to aging or the like, secure a site in the vicinity of the existing pillar and build a new pillar there Was. In such a construction method, the existing columns had to be removed, and a great deal of labor and cost occurred, such as removal of existing columns, removal of concrete foundations, and industrial waste disposal.

  As a prior art, the construction method of the pile using the existing pile is disclosed by patent document 1, for example. The method disclosed in Patent Document 1 places a new steel pipe pile so as to cover an existing pile used for an old building or a building, etc., and high strength is provided in the gap between the steel pipe pile inner surface and the existing pile outer surface. It is a method of filling mortar and fixing them integrally to construct a new pile. It is a construction method that reuses the existing pile as it is, but it is difficult to develop this construction method to rebuild the existing column into a new one because it is a construction method related to the construction of only the pile part.

  Further, for example, Patent Documents 2 and 3 disclose a joint structure and a construction method of a steel pipe column and a steel pipe pile in the case of using a steel pipe pile in the connection of a column and a pile of a building. Structures and methods are disclosed that are easy to adjust. However, it is also difficult for these structures and methods to be developed to rebuild existing pillars of new pole structures into new ones.

Japanese Patent Application Laid-Open No. 7-11636 Patent No. 3843896 Patent No. 3838165 gazette

  Therefore, the object of the present invention is to provide a new source position where the construction time and the cost can be reduced without the need for securing a new site and removing the foundation part when rebuilding an existing pole structure into a new pillar. It is to provide a building column construction method and a former position building column structure.

In order to solve the above-mentioned subject, former position building pillar construction method concerning the present invention,
The existing column is cut at a position above the ground surface to remove the upper part of the existing column, and the foundation including the penetration of the existing column into the ground is left in the original position,
A plurality of anchor bolts are erected on the upper surface of the base portion located around the rooting portion,
It has a column part corresponding to the upper part of the existing column, has a base plate around the lower part of the column part, is fixed to the lower part of the column part at the inner central part of the lower part of the column part and extends below the base plate The base portion in a state where the core post portion is inserted into the rooting portion and the base plate is adjusted to a predetermined posture via the plurality of anchor bolts, with a new post having a core post portion extending. Fixed against
A non-shrink mortar is injected and filled between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the rooting portion, and then cured.
It consists of a construction method characterized by That is, the upper structure of the existing column (a portion above the GL (ground line, ground surface)) is cut off at the site to be removed, and the base portion of the existing column is reused to construct a new column. It is a pillar construction method.

  In the former position building column construction method according to the present invention, the foundation portion including the penetration portion of the existing column is left as it is, and the plurality of anchor bolts are erected on the upper surface of the foundation portion. The new column to be rebuilt has a column portion corresponding to the upper portion of the existing column, has a base plate around the lower portion of the column portion, and at the lower central portion of the lower portion of the column portion It is made a structure having a core pillar which is fixed and extends to the lower side than the base plate, and the new pillar is inserted into the penetration part of the existing pillar of the foundation where the core pillar is left, It is adjusted to be in a predetermined posture (for example, a posture in which the base plate becomes horizontal or a posture in which the new column becomes vertical) through the anchor bolt of (1), and is fixed to the base portion in that state. In the steps so far, the foundation part of the existing pillar is reused and the new pillar is fixed to the foundation part in a target posture (reconstruction posture). From this state, in the present invention, non-shrink mortar is injected, filled, and filled between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the penetration portion. Shrink mortar is cured. Through this non-shrink mortar, the lower part of the new pillar which has been adjusted to the target posture is firmly and completely fixed to the foundation of the existing pillar left at the original position. Thus, in the former position building column construction method according to the present invention, by reusing the foundation portion of the existing column as compared with the conventional building column construction method in which a reclamation site is newly secured in the vicinity of the existing column. This will eliminate the need for securing new land and removing foundations, and will enable significant reductions in construction time and cost.

  In the former position building column construction method according to the present invention, the form of the column is not particularly limited, and the existing column has a base portion including the penetration portion, and as the new column, an anchor bolt is provided at the lower portion thereof. What is necessary is that it has a base plate that can be adjusted to a predetermined posture via a center pole portion that can be inserted into the remaining rooting portion. In particular, when the existing column and the new column are made of steel pipe, it is easy to implement the former position building column construction method according to the present invention.

  Moreover, as a base part of the existing pillar left in the original position, it is preferable that it is what is made from concrete root winding. By having the concrete root winding, the anchor bolt can be easily set up on the top surface of the concrete root winding as the top surface of the base portion.

  As an anchor bolt, it is preferable to use a resin system post-construction anchor from the viewpoint of ease of installation, strength after installation, and the like. In addition, this resin system post-construction anchor is generally used also by the name of "chemical anchor (registered trademark)".

  When the base plate provided at the lower part of the new column is adjusted to a predetermined posture through a plurality of anchor bolts, it is preferable to adjust to a predetermined posture through a nut screwed to the anchor bolt. That is, while inserting each anchor bolt into the base plate, screwing the upper and lower nuts so as to sandwich the base plate and tightening the nuts, the base plate for the plurality of anchor bolts and, consequently, the new pillar is targeted It can be adjusted and fixed to the posture of.

  Further, in the former position building column construction method according to the present invention, after being sand-packed to the predetermined height in the rooting section in the rooting section of the foundation section of the existing column left at the original position, Preferably, the center pillar portion is inserted into the rooting portion. In this way, the height of the bottom surface in the rooting section is determined to be approximately a predetermined height by sand filling, so when inserting the core column section of the new column into the rooting section, the height of the core column section inserted. The lower end can be substantially landed on the bottom surface in the penetration portion, whereby at least a part of the weight of the new pillar can be received at the bottom surface in the penetration portion. Then, since the weight of the new column is reduced, the fine adjustment of the posture of the new column before fixing, for example, the fine adjustment of the posture of the base plate through the above-mentioned anchor bolt is possible. Adjustment becomes easy.

  Moreover, in the former position building column construction method which concerns on this invention, when inject | pouring the said non-shrinkage mortar, it is preferable to install a formwork around the upper surface of a base part, and a base plate. By installing the formwork, it is possible to prevent the non-shrinkage mortar from protruding or flowing out from between the upper surface of the base portion and the base plate to the outside, and it is possible to precisely inject and fill the non-shrinkage mortar to the desired site Become. In addition, non-shrink mortar is also called grout material, and as the name of non-shrinkage, it is a high strength material that does not shrink like general mortar, and it is very useful as a finish material for construction including anti-seismic reinforcement work It is an excellent material for

In the former position building column structure according to the present invention, the existing column cut and removed at a position above the ground surface in a state where the foundation portion including the penetration portion of the existing column into the ground is left at the former position. Have a new column replaced for the top,
The new pillar has a base plate around its lower portion, and has a core post fixed to the lower portion at an inner central portion of the lower portion and extending below the base plate,
With respect to the base portion, the new pillar is adjusted to a predetermined posture via a plurality of anchor bolts provided on the upper surface of the base portion where the base plate is located around the rooting portion. Fixed and
A non-shrinkage mortar is filled and cured between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the rooting portion. .

  Also in the former position building column structure according to the present invention, various preferable structures similar to those described in the former position building column method according to the present invention described above can be adopted.

  As described above, according to the former-position column method and the former-position column structure according to the present invention, a new column is constructed as compared with the conventional column method in which a reclamation site is newly secured near the existing column. It is possible to effectively reuse the foundation of the existing pillars without the need for securing the land for use. Industrial waste treatment such as concrete does not occur because the foundation part is reused. In addition, since a new site for rebuilding is unnecessary and the foundation part of the existing columns can be reused, construction time and cost can be significantly reduced. In addition, early restoration of facilities, including building columns and surrounding facilities, will be possible.

It is a fragmentary perspective view showing in order each step of former position building pillar construction method concerning one embodiment of the present invention. It is a fragmentary perspective view which shows in order each step following the step of FIG. It is a partial longitudinal cross-sectional view (A) and a partial top view (B) of the original position building pillar structure concerning one embodiment of the completed this invention.

Hereinafter, embodiments of the former-position column construction method and the former-position column structure according to the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 show in order each step of the former position building column construction method which concerns on one Embodiment of this invention. In FIG. 1, the state before rebuilding of the penetration type existing pillar to be rebuilt as step (1) is shown, 1 indicates an existing pillar, and 2 includes a concrete root winding 3 The base part of the existing pillar 1 is shown. First, in step (2), the existing column 1 is cut at a position above the ground surface (in the illustrated example, at a position immediately above the concrete root wrap 3 of the base 2), and the upper portion 1a of the existing column 1 Is removed, and the foundation portion 2 including the penetration portion 1b of the existing pillar 1 into the ground and the concrete root winding 3 is left at the original position. For cutting the existing column 1, an appropriate cutting means may be used.

  Subsequently, in the present embodiment, in step (3), sand filling is performed from above in the rooting portion 1b to a predetermined height position in the rooting portion 1b. For example, mountain sand is used as the sand 4 to be packed. It is preferable that the predetermined height position in the rooting portion 1b to be sand-packed is a height position substantially coincident with the lower end position of the core post inserted in the rooting portion 1b described later.

  Subsequently, in the present embodiment, in the step (4), a plurality of anchor bolts 5 are provided on the upper surface of the foundation portion 2 located around the rooting portion 1b (in the present embodiment, on the upper surface of the concrete root winding 3). It is set up. As the anchor bolt 5, it is preferable to use a resin-based post-construction anchor from the viewpoint of ease of installation, strength after installation, etc. As a resin-based post-construction anchor, use "chemical anchor (registered trademark)" it can.

  Subsequently, in the present embodiment, in step (5), the level adjusting nut 6 is attached to each erected anchor bolt 5. At this stage, in order to adjust the position (level) of each nut 6, using a dummy flat plate (not shown) having each anchor bolt 5 insertion hole, all anchor bolts 5 are inserted through the flat plate and the flat plate Adjust the screw position of each nut 6 to each anchor bolt 5 so that the flat plate becomes horizontal using a spirit level etc. in a state of being temporarily placed on each nut 6, and remove the flat plate after adjustment Is preferred. Alternatively, it is possible to adjust the level of each nut 6 so that the base plate becomes horizontal, with the upper nut provided in the next step (6), at the stage of step (6) described next. As described above, it is easier to adjust the level of each nut 6 first by using a dummy flat plate, and it is adjusted with the upper nut provided in the next step (6) to finalize the attitude of the base plate It is preferable to make the final fine adjustment that is performed as needed.

  Subsequently, in the present embodiment, in step (6) shown in FIG. 2, a new pillar 10 is installed (built up) on the foundation portion 2 of the existing pillar including the above-mentioned rooting portion 1 b. The new column 10 has a column portion 10a corresponding to the upper portion 1a of the existing column, has a horizontally extending base plate 11 around the lower portion of the column portion 10a, and an inner central portion of the lower portion of the column portion 10a In the lower part of the column portion 10a, there is provided a core column portion 13 fixed to the lower portion of the column portion 10a via an annular support 12 (shown in the next step (7)). The base plate 11 is integrated with the column portion 10a in a state of being reinforced by a plurality of ribs 14 provided around the column portion 10a. The core pillar portion 13 of the new pillar 10 is inserted into the penetration portion 1b, and the plurality of anchor bolts 5 are inserted into the plurality of bolt insertion holes 15 provided in the base plate 11, and the level is adjusted first. The base plate 11 is locked at the position of each nut 6. If the level of the respective nuts 6 is previously adjusted to be horizontal, the base plate 11 is also locked in the horizontal attitude. The nuts 16 are screwed into and tightened on the anchor bolts 5 projected onto the base plate 11, and the base plate 11 is fixed in a predetermined horizontal posture by the nuts 6 and 16. Since each anchor bolt 5 is fixed to the base portion 2, the base plate 11 is fixed to the base portion 2 in a predetermined horizontal posture via the anchor bolt 5. It is preferable to use a double nut or a special locking nut for the nut 16 in order to secure the tightening and fixing strength by the nut 16 and to prevent the loosening. Further, at this stage, it is also possible to finely adjust the screwing positions of the nuts 6 and the nuts 16 with respect to the anchor bolts 5 to further improve the accuracy of the levelness of the base plate 11. Further, since the base plate 11 and the column portion 10a of the new column 10 are substantially integrated, for example, while observing the vertical degree of the column portion 10a of the new column 10, the screwing position of each nut 6 and each nut 16 It is also possible to make a fine adjustment of In any case, in this step (6), the pillar position and posture of the new pillar 10 with respect to the original position of the foundation part 2 of the existing pillar are determined. The position of the lower end of the core pillar 13 inserted into the rooting portion 1b and the position of the upper surface of the sand 4 packed in the rooting portion 1b do not necessarily coincide, but they are substantially coincident with each other. By setting it, it is possible to avoid unnecessary excess of non-shrink mortar to be poured and filled, and it is also possible to take part of the weight of the new pillar 10 on the upper surface of the sand 4 Therefore, fine adjustment of the posture of the new column 10 is facilitated.

  Subsequently, in the present embodiment, in step (7), the mold 17 for injection and filling of the non-shrinkage mortar performed in the subsequent step (8) is between the upper surface of the base portion 2 and the base plate 11. It is installed around. By installing the formwork 17, it is possible to prevent the non-shrinkage mortar from protruding or flowing out from between the upper surface of the base portion 2 and the base plate 11, and injecting and filling the non-shrinkage mortar to the desired site with high accuracy. Becomes possible.

  Subsequently, in step (8), the non-shrinkage mortar 20 is inserted between the upper surface of the base portion 2 and the base plate 11 through the injection hole 18 opened in the base plate 11 and using a suitable injector with injection tube 19. It is injected and filled between and between the outer peripheral surface of the core post 13 and the inner peripheral surface of the penetration portion 1b. The non-shrink mortar 20 filled with a predetermined amount at a predetermined site is cured for an appropriate period in step (9). If the formwork 17 is removed after curing, as shown in step (10), the construction of the new pillar is completed at the former position of the existing pillar.

  The original position building post structure according to the completed embodiment is shown in FIG. As exemplified in the above embodiment, in the former-position pillar method and former-position pillar structure according to the present invention, as compared with the conventional pillar method in which a site for rebuilding is newly secured in the vicinity of the existing pillars. It is possible to effectively reuse the foundations of existing pillars without having to secure a site for new construction pillars. Moreover, in order to reuse the foundation part of the existing pillar, the industrial waste disposal of concrete etc. by removal of the foundation part of the existing pillar does not occur. In addition, since a new rebuilding site is unnecessary and the foundation part of the existing pillar can be reused, it becomes unnecessary to secure the site and construction of the foundation part, and it becomes possible to significantly reduce the construction time and cost. In addition, the reduction of construction time enables early restoration of facilities, including building columns and surrounding facilities.

  The forms shown in FIGS. 1 to 3 are exemplifications as one embodiment of the present invention, and the forms conforming to the illustrated forms are also included in the scope of the present invention without departing from the configuration defined in the present invention. .

  The present invention can be applied to rebuilding of all existing pillars to new pillars, and in particular, it is suitable for rebuilding steel pipe pillars such as disaster prevention wireless pillars and signal pillars, for which rebuilding is required because of deterioration or the like. is there.

DESCRIPTION OF SYMBOLS 1 existing column 1a upper part 1b of existing column 1 penetration part of existing column 2 foundation part 3 concrete root winding 4 sand 5 anchor bolt 6 nut 10 new column 10a column part 11 of new column corresponding to upper part of existing column 11 base plate 12 support Body 13 core post 14 rib 15 bolt insertion hole 16 nut 17 form 18 injection hole 19 injection tube 20 non-shrink mortar

In order to solve the above-mentioned subject, former position building pillar construction method concerning the present invention,
The existing column is cut at a position above the ground surface to remove the upper part of the existing column, and the foundation including the penetration of the existing column into the ground is left in the original position,
A plurality of anchor bolts are erected on the upper surface of the base portion located around the rooting portion,
It has a column portion corresponding to the upper portion of the existing column, and has a base plate integrated with the lower portion of the column portion around the lower portion of the column portion, and is provided in the inner central portion of the lower portion of the column portion the new column having a core pillar portion extending to below the secured to and the base plate at the bottom of the post portion, with the core bar portion is inserted into the embedment portion, said base plate via the plurality of anchor bolts Fixed to the base portion in a state where it is adjusted and fixed to a predetermined posture,
A non-shrink mortar is injected and filled between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the rooting portion, and then cured.
It consists of a construction method characterized by That is, the upper structure of the existing column (a portion above the GL (ground line, ground surface)) is cut off at the site to be removed, and the base portion of the existing column is reused to construct a new column. It is a pillar construction method.

In the former position building column structure according to the present invention, the existing column cut and removed at a position above the ground surface in a state where the foundation portion including the penetration portion of the existing column into the ground is left at the former position. Have a new column replaced for the top,
The new column has a base plate which is integral with the lower portion in its lower periphery, is secured to the lower portion and is mounted within the central portion of the lower and having a core pillar portion extending to below the base plate Yes,
The base portion in a state where the new pillar is adjusted and fixed to a predetermined posture via a plurality of anchor bolts provided on the upper surface of the base portion where the base plate is located around the rooting portion Fixed against
A non-shrinkage mortar is filled and cured between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the rooting portion. .

Claims (8)

The existing column is cut at a position above the ground surface to remove the upper part of the existing column, and the foundation including the penetration of the existing column into the ground is left in the original position,
A plurality of anchor bolts are erected on the upper surface of the base portion located around the rooting portion,
It has a column part corresponding to the upper part of the existing column, has a base plate around the lower part of the column part, is fixed to the lower part of the column part at the inner central part of the lower part of the column part and extends below the base plate The base portion in a state where the core post portion is inserted into the penetration portion and the base plate is adjusted to a predetermined posture via the plurality of anchor bolts, with the new post having the core post portion extending. Fixed against
A non-shrink mortar is injected and filled between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the rooting portion, and then cured.
Former position building column construction method characterized by   The former position building column construction method according to claim 1, wherein the existing column and the new column are made of steel pipes.   The former position building column construction method according to claim 1 or 2, wherein the foundation portion includes a concrete root winding.   The former position building pillar construction method according to any one of claims 1 to 3, wherein a resin-based post-construction anchor is used as the anchor bolt.   The original position building column construction method according to any one of claims 1 to 4, wherein the base plate is adjusted to a predetermined posture via a nut screwed to the anchor bolt.   The former position building column construction method according to any one of claims 1 to 5, wherein the core post portion is inserted into the rooting portion after sand filling to the predetermined height in the rooting portion in the rooting portion.   The former position building post construction method according to any one of claims 1 to 6, wherein a mold is installed around the upper surface of the base portion and the base plate when the non-shrinkage mortar is poured. With the new column replaced to the upper part of the existing column which was cut and removed in the position above the ground surface in the state where the foundation part including the penetration part to the underground of the existing column is left at the original position ,
The new pillar has a base plate around its lower portion, and has a core post fixed to the lower portion at an inner central portion of the lower portion and extending below the base plate,
With respect to the base portion, the new pillar is adjusted to a predetermined posture via a plurality of anchor bolts provided on the upper surface of the base portion where the base plate is located around the rooting portion. Fixed and
Non-shrinkage mortar is filled and cured between the upper surface of the base portion and the base plate and between the outer peripheral surface of the core post and the inner peripheral surface of the rooting portion. Column structure.

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