JP2005307512A - Building and construction method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building and a construction method of the building, dispensing with reinforcement of a foundation part to be defense against the occurrence of an earthquake to thereby reduce the cost. <P>SOLUTION: This building 1 includes: a foundation pile 11 buried in the ground 10; a pile main reinforcement 12 buried in the foundation pile 11 and disposed with the upper end thereof flush with the top face 13 of the foundation pile 11 or lower than the top face 13; a reinforcing bar 14 disposed within a predetermined range in the central part of the top face 13 of the foundation pillar 11and projected from the top face 13 of the foundation pile 13; a spacer 15 placed on the top face 13 of the foundation pile 13 and decreased in thickness by predetermined compressive force; a foundation part 17 provided at a space from the foundation pile 11 on the upper side of the spacer 15, in which the projecting part 16 of the reinforcing bar 14 is buried; and a skeleton body 18 provided on the foundation part 17. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a building and a building construction method, and more particularly to a building and a building construction method suitable for constructing a new building on the site of a building removed by demolition or the like. About.

  Previously, when a building was dismantled and another building was built on the site, the existing foundation pile that had fixed the dismantled building was reused as the foundation pile for the newly constructed building There are things to do. This is because the cost for removing the foundation pile is high, and if it can be reused, the cost will be reduced as compared to newly installing the foundation pile.

  In this case, conventionally, as shown in FIG. 6, a construction in which a pile head (upper end) 50 a of an existing foundation pile 50 and a portion 51 a protruding from the upper surface of the foundation pile 50 of the pile main reinforcement 51 are newly constructed. It was buried in the foundation 52 of the object. In addition, the code | symbol 53 in FIG. 6 is a ground, 54 is the frame main body of a building.

  However, in the conventional method, when a horizontal force acts on the foundation pile 50 when an earthquake occurs, a bending moment is generated in the pile head 50a, and this bending moment is transmitted via the pile head 50a and the pile main reinforcement 51 of the foundation pile 50. It is transmitted to the base portion 52 in the size as it is.

  Then, since a relatively large stress acts on the foundation portion 52 in accordance with the bending moment generated in the foundation pile 50, the foundation portion 52 is reinforced according to the stress in order to prevent the foundation portion 52 from being damaged. There was a need to do.

  Thus, in order to reinforce the foundation 52 so as to withstand an earthquake, a large number of reinforcing members are required, and a large number of work steps are required to perform the mounting work, resulting in a significant cost. There was a problem of being up.

  Furthermore, conventionally, since the upper end portion 51a of the existing pile 51 is embedded in the foundation structure 52, the shear strength of the foundation pile 50 can only bear the same weight as the previous structure, and is larger than the previous structure. There was a problem that things could not be built.

  Such a problem occurs not only when reusing an existing foundation pile but also when a foundation pile is newly constructed and a building is constructed thereon.

  The present invention has been made in view of such problems, and it is not necessary to reinforce the foundation in preparation for the occurrence of an earthquake, which can reduce the cost and is larger than before in the site of the removed building. It is an object to provide a building capable of building a building and a method for building the building.

The present invention employs the following means in order to solve the above problems. That is, the present invention relates to a foundation pile embedded in the ground, a pile main bar embedded in the foundation pile, the upper end of which is the same as or below the upper surface of the foundation pile, and the foundation pile. It is disposed within a predetermined range at the center of the upper surface of the steel bar, and the reinforcing bar protrudes from the upper surface of the foundation pile, and is placed on the upper surface of the foundation pile, and its thickness is reduced by a predetermined compressive force. It is provided with a spacer, a base part provided separately from the base part on the upper side of the spacer and having a protruding portion of the reinforcing bar embedded therein, and a frame body provided in the shape of a base part. .

  In the present invention, the foundation pile and the foundation portion are separated, and the foundation pile and the foundation portion are coupled by a reinforcing bar provided in the center of the upper surface of the foundation pile. When, the reinforcing bar is plasticized with a smaller moment than the conventional one, and the moment generated in the foundation pile and the foundation portion is also reduced.

  Reinforcing bars are gathered and arranged in a relatively narrow area in the center of the upper surface of the foundation pile, so that the bending moment generated in the foundation pile can be transmitted through the reinforcing bars by appropriately setting the reinforcing bar range and reinforcing bar strength. The bending moment transmitted to the foundation can be set as appropriate.

  Further, when a bending moment in the opposite direction is applied to the foundation pile and the foundation, rotation occurs between the foundation pile and the foundation, and the spacer is compressed by this rotation.

  Here, the spacer is preferably formed of an elastic member such as rubber or a plastic deformation member such as foamed resin. The thickness of the spacer is determined in consideration of the rotation angle determined by design.

  In addition, the above-mentioned spacer is a material whose thickness hardly changes even when compressed by the resultant force of the vertical force at the time of earthquake of the foundation and the main body of the frame and the moment generated in the foundation pile and the foundation, such as a steel plate or the like. Concrete or the like can also be used. In this case, it is not necessary to lay the front surface of the upper surface of the foundation pile, and the size of the spacer can be adjusted according to the required moment.

  Moreover, it is desirable to provide the restraining member which restrains the outer peripheral surface of a foundation pile in the upper end part of the said foundation pile. In this case, even if a relatively large tensile force or horizontal force acts on the reinforcing bar, it is possible to prevent the pile head from being split and broken. Examples of the restraining member include metal plates such as steel plates, reinforcing fibers such as carbon fibers and aramid fibers, and steel pipes. The metal plate and the reinforcing fiber are wound around the outer peripheral surface of the foundation pile, and the steel pipe is installed at the upper end portion of the foundation pile, and a gap is eliminated with a grout or the like.

  Moreover, it is preferable to provide a fixing member at at least one end of the reinforcing bar. In this case, since the reinforcing force of the reinforcing bars is increased, the length of the reinforcing bars can be shortened compared to the case where no fixing member is provided.

  Moreover, this invention is the construction method of a building which has a foundation pile, the pile main reinforcement provided in the said foundation pile, and the foundation part fixed to the said foundation pile, The upper end of the said pile principal reinforcement is made into the said foundation pile. A plurality of reinforcing bars are provided separately from the pile main bars within a predetermined range of the central part on the upper surface of the pile main bars, and the reinforcing bars protrude from the upper surface of the foundation pile. A spacer whose thickness is reduced by a predetermined compressive force is placed on the upper surface of the foundation pile, and the foundation portion of the building is provided on the spacer separately from the foundation pile, and the protruding portion of the reinforcing bar Is embedded in the foundation.

  Here, when constructing a new building on the site of another building removed by dismantling, etc., the existing foundation pile left on the site of the removed building is used and this foundation is used. The part which protrudes from the upper surface of the said foundation pile among the said pile main reinforcement provided in the pile is removed.

  In this case, since the existing foundation pile is reused, the amount of industrial waste can be reduced.

  In this case, the upper end of the foundation pile can be removed. Thereby, it can be made the same level as the bottom face of the foundation part of the building from which the bottom face of the foundation part has been removed, and further the gap between the foundation pile and the foundation part can be separated and the spacer can be arranged between them.

  As described above, according to the present invention, the bending moment transmitted from the foundation pile to the foundation portion when an earthquake occurs is reduced by bringing the reinforcing bar to the center pile center, and the hardness and size of the spacer are further adjusted. Therefore, the bending moment transmitted to the base portion can be adjusted. Therefore, by appropriately setting the specifications of the reinforcing bar and the spacer, the bending moment generated in the base portion can be adjusted and can be greatly reduced.

  As a result, the foundation can be prevented from being damaged in the event of an earthquake without reinforcing the foundation. Therefore, it is possible to reduce the cost of reinforcing materials for reinforcing the foundation and the work man-hours for installing it. Is possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
(First embodiment)
As shown in FIG. 1, a building 1 according to the present invention includes a foundation pile 11 embedded in the ground 10, a plurality of pile main bars 12 embedded in the foundation pile 11, and an upper surface 13 of the foundation pile 11. And a plurality of reinforcing bars 14 protruding upward from the upper surface 13 of the foundation pile 11.

  In addition, the building 1 is placed on the upper surface 13 of the foundation pile 11 and is provided separately from the foundation pile 11 on the upper side of the spacer 15 with a spacer 15 whose thickness is reduced by a predetermined compressive force. And a base portion 17 in which the protruding portion 16 of the reinforcing bar 14 is embedded, and a housing body 18 provided on the base portion 17.

  Next, each of the above configurations will be described. The foundation pile 11 is formed of reinforced concrete. The foundation pile 11 can be newly established or can be reused by partially processing an existing foundation pile that has fixed a building removed by dismantling or the like as will be described later.

  The pile main reinforcement 12 is arranged on the outer peripheral side of the foundation pile 11. Moreover, the upper end of each pile main reinforcement 12 is substantially coincident with the upper surface 13 of the foundation pile 11. In addition, you may arrange | position the upper end of the pile main reinforcement 12 below the upper surface 13 of the foundation pile 11. FIG.

  A hole 27 having a predetermined depth is provided at the center of the upper surface 13 of the foundation pile 11. A plurality of reinforcing bars 14 are inserted in the hole 27 in a state of being relatively close to each other. In the case of a new pile, the hole 27 is not provided, and the reinforcing bar 14 can be installed together with the pile main reinforcement in advance.

  That is, the plurality of reinforcing bars 14 are arranged in a range narrower than the range in which the plurality of pile main reinforcing bars 12 are arranged on the upper surface 13 of the foundation pile.

  The hole 27 is filled with an inorganic or organic adhesive 19. Thereby, the reinforcing bar 14 is fixed. It can also be filled with concrete or mortar.

  The spacer 15 is formed in a flat plate shape from a material whose thickness decreases when a predetermined compressive force is applied as described above, for example, an elastically deformable member such as rubber or a plastically deformable member such as foamed resin. By changing the hardness of this spacer, the bending moment of the pile head during an earthquake can be changed.

The spacer 15 is a base portion 1 of the building 1 in a normal state where no earthquake occurs.
7 and the main body 18 are affected by their own weight, the concrete 28a is filled between the rebars 14 and 14, so the thickness of the spacer 15 does not decrease. When the vertical force at the time of earthquake of the base part 17 and the frame main body 18 and the bending moment which generate | occur | produces in the base part 15 act, it sets so that the thickness may reduce.

  The concrete 28a is cast with a concrete having the same strength or higher than that of the foundation portion 17. This part is structurally reinforced concrete.

  In addition, a steel pipe 20 that is a restraining member is fitted into the upper end portion of the foundation pile 11 in order to restrain the concrete 28. Instead of the steel pipe 20, a material having a high tensile strength such as a reinforcing fiber such as a steel plate, carbon fiber, or aramid fiber can be wound around the outer peripheral surface of the base portion 11. It is necessary to eliminate the gap between the foundation pile 11 and the steel pipe 20 or the steel plate by filling mortar or the like.

  The foundation 17 is reinforced concrete and is completely separated from the foundation pile 11. And the foundation part 17 and the foundation pile 11 are couple | bonded only by the some reinforcing bar 14. FIG.

  Next, the operation of the building 1 will be described. Now, when an earthquake occurs and a horizontal force F acts on the upper side of the foundation pile 11, a bending moment is generated at the upper end of the foundation pile 11. This bending moment is transmitted to the base portion 17 through the reinforcing bar 14 and the like.

  On the other hand, the plurality of reinforcing bars 14 are arranged close to each other, so that the tensile strength of the entire reinforcing bar 14 is large, and a part of the reinforcing bar 14 generated when an earthquake occurs is used as a tension, and a part of the concrete 28a and a part of the spacer 15 are provided. Is set so as to be deformed by a bending moment as a couple to be compressed.

  As a result, when a bending moment determined by the hardness of the reinforcing bar 14 and the spacer 15 of the foundation pile 11 is transmitted to the foundation portion 17 via the reinforcing bar 14, the foundation pile depends on the hardness and size of the reinforcing bar 14 and the spacer 15. The bending moment can be adjusted at a portion between 11 and the base portion 17.

  Thus, in the building 1 of the present invention, the bending moment transmitted from the foundation pile 11 to the foundation portion 17 at the time of the earthquake can be arbitrarily adjusted by setting the hardness and size of the reinforcing bar 14 and the spacer 15. Thereby, the stress which generate | occur | produces in the base part 17 can be reduced.

  Here, the specifications such as the material, strength, and dimensions of the reinforcing bar 14 and the spacer 15 are appropriately set in consideration of the shape, weight, expected earthquake magnitude, and the like of the building 1. And the stress which generate | occur | produces in the foundation part 17 corresponding to the bending moment transmitted to the foundation part 17 from the foundation pile 11 at the time of an earthquake occurrence is set so that it may reduce to such an extent that the foundation part 17 is not damaged.

  Thereby, since it is not necessary to reinforce the foundation portion 17 in preparation for the occurrence of an earthquake, it is possible to reduce the number of reinforcing materials and the number of mounting work steps, thereby enabling a significant cost reduction.

  Moreover, since the concrete 28 of the upper end part of the foundation pile 11 is restrained by the steel pipe 20, the structure 1 of this invention WHEREIN: When comparatively big tensile force and horizontal force act on the reinforcing bar 14, the foundation pile 11 It is possible to prevent the concrete 28 from being split and broken.

  Furthermore, since the building 1 of the present invention does not embed the upper end portion of the foundation pile 11 in the foundation portion 17, the shearing force acting on the foundation pile 11 when an earthquake occurs is similar to the conventional method. It becomes smaller than the case where it is embedded in the base part 17.

  Therefore, when the building 1 of the present invention is newly constructed on the site of the building removed by dismantling or the like, the shear strength of the foundation pile 11 has a margin, so the weight is larger and larger than the previous building. A large-scale building 1 can be constructed.

  In addition, instead of rubber or foamed resin, the spacer 15 has a resultant force of a vertical force of the base portion 17 and the housing body 18 due to an earthquake and a bending moment generated in the base portion 17 when the earthquake occurs. However, a material whose thickness hardly changes, such as a steel plate, can be used.

  In this case, the distance between the point of action of the tensile force and the point of action of the compressive force increases, and the bending moment also increases. Such adjustment is possible by using a steel plate or the like for the spacer 15. Even in this case, the bending moment can be set to half or less as compared with the conventional method.

  Moreover, when using the foundation pile 11 from which a pile diameter differs, adjusting the hardness and magnitude | size of the reinforcing bar 14 and the spacer 15 makes these foundation piles 11 the pile which can bear the same bending moment. it can.

(Second Embodiment)
FIG. 2 shows a reinforcing bar 21 according to a second embodiment of the present invention. The reinforcing bars 21 are provided with fixing members 22 such as nuts at upper and lower ends. Thereby, since the fixing force with the reinforcing bar 21, the foundation pile 11, and the foundation part 17 increases, the length of the reinforcing bar 21 can be shortened. Note that the fixing member 22 may be provided only on one of the upper end portion and the lower end portion of the reinforcing bar 21.

(Third embodiment)
3 to 5 show a building construction method according to a third embodiment of the present invention. Here, the case where another structure is newly built using the existing foundation pile which fixed this building in the site of the building removed by dismantling etc. is demonstrated. In addition, the same code | symbol is attached | subjected to the part similar to FIG. 1, and the detailed description is abbreviate | omitted.

  Here, first, as shown in FIG. 3, the upper end part 11a of the existing foundation pile 11 and the part 12a which protrudes upwards from the upper surface 23 of the foundation pile 11 among the pile main reinforcement 12 are removed.

  In this example, the upper surface 13 of the foundation pile 11 after removing the upper end portion 11a is made lower by the amount of the spacer 15 (see FIG. 1) than the bottom surface 25 of the foundation portion 24 of the removed building.

  Next, as shown in FIG. 4, a hole 27 having an appropriate diameter and depth is provided at the center of the upper surface 13 of the foundation pile 11. Further, the steel pipe 20 is fitted into the upper end portion of the foundation pile 11 and the gap is filled with grout or the like.

  Next, as shown in FIG. 5, the plurality of reinforcing bars 14 are inserted into the hole 27 in a state of approaching each other, and the adhesive 19 (see FIG. 1) is filled into the hole 27 to fix the reinforcing bar 14. Instead of the adhesive 19, concrete, mortar, or the like can be filled.

  Thus, while removing the upper end part 11a of the existing foundation pile 11, and providing the reinforcing bar 14 and the spacer 15 in the foundation pile 11, as shown in FIG. In this state, the foundation 1 and the main body 18 are provided to complete the construction of the building 1.

According to the present invention, when another building 1 is newly constructed on the site of the building removed by dismantling or the like, the existing foundation pile 11 that has fixed the previous building can be reused. In addition, it is possible to save the trouble of removing the existing foundation pile 11, thereby shortening the construction period and reducing the cost. In addition, the amount of industrial waste can be reduced.

  In the above embodiment, the case where the building 1 is constructed using the existing foundation pile 11 left in the site of the removed building has been described. However, the present invention newly provides the foundation pile 11. This can also be applied when building 1 is constructed.

  In this case, the height of the foundation pile 11 can be arbitrarily set, and the pile main bar 12 can be prevented from protruding from the foundation pile 11, so that the upper end of the foundation pile and the foundation pile are used as in the case of using an existing foundation pile. The work which removes the pile main bar which protrudes from a foundation pile becomes unnecessary. Moreover, the reinforcing bar 14 can be previously prepared in the foundation pile 11.

It is sectional drawing which shows the foundation pile and foundation part of the building of 1st Embodiment which concern on this invention. It is sectional drawing which shows the reinforcing bar provided in the foundation pile of 2nd Embodiment which concerns on this invention. It is a figure which shows the construction method of the building of 3rd Embodiment which concerns on this invention, and is sectional drawing which shows the method of removing the upper end part of the existing foundation pile, and the protrusion part of a pile main reinforcement. It is a figure which shows the construction method of the building of 3rd Embodiment which concerns on this invention, and is sectional drawing which shows the method of providing a spacer and a reinforcing bar in a foundation pile. It is a figure which shows the construction method of the building of 3rd Embodiment which concerns on this invention, and is A arrow line view of FIG. It is sectional drawing which shows the foundation pile and foundation part of the building which concern on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building 10 Ground 11 Foundation pile 11a Upper end of foundation pile 12 Pile main reinforcement 12a Protrusion part of pile main reinforcement 13 Upper surface of foundation pile 14 Reinforcement 15 Spacer 16 Reinforcement protrusion 17 Foundation part 18 Body body 19 Adhesive 20 Steel pipe (restraint Element)
DESCRIPTION OF SYMBOLS 21 Reinforcing bar 22 Fixing metal fitting 23 Top surface 24 Foundation part 25 Bottom surface of foundation part 27 Hole 28, 28a Concrete 50 Foundation pile 50a Pile head 51 Pile main reinforcement 52 Foundation part 53 Ground

Claims (8)

Foundation piles buried in the ground,
Pile main bars that are embedded in the foundation pile and whose upper end portion is the same as or located below the upper surface of the foundation pile,
Reinforcing bars that are arranged within a predetermined range at the center of the upper surface of the foundation pile and project from the upper surface of the foundation pile,
A spacer which is placed on the upper surface of the foundation pile and whose thickness decreases with a predetermined compressive force;
A building comprising: a foundation portion provided separately from the foundation pile above the spacer and having a protruding portion of the reinforcing bar embedded therein.   The building according to claim 1, wherein the spacer is an elastic deformation member or a plastic deformation member.   The building according to claim 1 or 2, wherein a restraining member for restraining an outer peripheral surface of the foundation pile is provided at an upper end portion of the foundation pile.   The building according to claim 3, wherein the restraining member is a plate-like member or a tubular member, and the plate-like member or the tubular member is a metal or a reinforcing fiber such as carbon fiber or aramid fiber. .   The building according to claim 1, wherein a fixing member is provided at at least one end of the reinforcing bar. In a construction method of a building having a foundation pile buried in the ground, a pile main bar provided in the foundation pile, and a foundation portion fixed to the foundation pile,
The upper end of the pile main bar is arranged on the same or lower side of the upper surface of the foundation pile,
In the center of the upper surface of the pile main bar, a plurality of reinforcing bars are provided separately from the pile main bar, and the reinforcing bar protrudes from the upper surface of the foundation pile,
Place a spacer whose thickness is reduced by a predetermined compressive force on the upper surface of the foundation pile,
The foundation of the building is provided separately from the foundation pile on the spacer,
A method for constructing a building, characterized in that a protruding portion of the reinforcing bar is embedded in the foundation. The building is built on the site of another removed building,
The foundation pile is an existing foundation pile left on the site of the other building,
The method of constructing a building according to claim 6, wherein a portion of the pile main reinforcement protruding from the upper surface of the foundation pile is removed.   The building construction method according to claim 7, wherein the spacer is placed on an upper surface of the foundation pile after the upper end portion of the foundation pile is removed.

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