Construction method

Abstract

To provide a technology that enables effective use of a permanent equipment foundation to install a tower crane before constructing a building foundation body, and uses the tower crane to efficiently construct a building foundation body, in a construction method for constructing a building in which an equipment foundation is provided inside the building foundation body when viewed in plan using the tower crane installed on a tower crane foundation.SOLUTION: A construction method includes: a dual-purpose foundation advance construction process of constructing a dual-purpose foundation 3 made by modifying specifications of an equipment foundation 2 so that it can also be used as a foundation for a tower crane prior to the construction of a main building foundation; a tower crane installation process of installing a tower crane in a state where it is supported by the constructed dual-purpose foundation 3; a subsequent construction process of the installed tower crane is used to construct the building foundation body; and an equipment installation process of installing equipment on the dual-purpose foundation from which the tower crane has been removed.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a construction method, and more particularly to a construction method for constructing a building using a tower crane installed on a foundation for a tower crane.

Background Art

[0002] As a construction method for constructing a building, a tower crane installed on a temporary foundation for a tower crane constructed within a construction site is used to transport construction materials such as precast concrete members, steel members, and reinforcing bars to the construction location while constructing the building (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above construction method, since the foundation for the tower crane is temporary, the temporary construction materials (such as concrete) for constructing the temporary foundation for the tower crane increase, and there is a problem that the construction work and removal work of the temporary foundation for the tower crane take extra time and effort.

[0005] Also, in the above construction method, it is desirable to construct the temporary foundation for the tower crane prior to the construction of the building foundation body so that the tower crane can be used, for example, from the time of constructing the building foundation body such as a reinforced concrete structure or a steel structure installed on the ground. In this regard, if the construction site cannot secure an installation space for a temporary tower crane foundation outside the construction area, a temporary tower crane foundation must be installed within the construction area. At this time, if the building to be constructed is a building equipped with an equipment foundation on the inner side of the building foundation main body in plan view, it is conceivable to construct a temporary tower crane foundation using the installation space of the equipment foundation on the inner side of the construction location of the building foundation main body. However, in this case, for example, inconveniences such as interference between the temporary piles provided for the temporary tower crane foundation and the settlement suppression piles provided for the equipment foundation may occur, which may affect the temporary design plan.

[0006] In view of this situation, the main problem of the present invention is to provide a construction method for constructing a building equipped with an equipment foundation on the inner side of the building foundation main body in plan view using a tower crane installed on a tower crane foundation, effectively utilizing the main equipment foundation to install the tower crane before constructing the building foundation main body, and providing a technology that can efficiently construct the building foundation main body using the tower crane.

Means for Solving the Problems

[0007] The first characteristic configuration of the present invention is a construction method for constructing a building equipped with an equipment foundation on the inner side of the building foundation main body in plan view using a tower crane installed on a tower crane foundation, a combined foundation pre-construction step of constructing a combined foundation in which the equipment foundation is redesigned to be combined with the tower crane foundation prior to the construction of the building foundation main body; a tower crane installation step of installing a tower crane in a state of being supported by the constructed combined foundation; a subsequent construction step of constructing the building foundation main body using the installed tower crane; and an equipment installation step of installing equipment on the combined foundation from which the tower crane has been removed.

[0008] According to this configuration, by performing the combined foundation prior construction process and the tower crane installation process, before constructing the building foundation main body, a combined foundation is constructed in which the equipment foundation is redesigned to be usable as the tower crane foundation. Thus, the installed tower crane can be installed in a state supported by the combined foundation without causing inconveniences such as interference between the temporary piles provided for the temporary tower crane foundation and the settlement suppression piles provided for the equipment foundation. Moreover, since the combined foundation is also used as the foundation for the tower crane, no removal work is required, and waste of labor and time can be reduced. Then, by performing the subsequent building process, the building foundation main body can be constructed using the installed tower crane. Furthermore, by performing the equipment installation process, the equipment can be appropriately installed on the combined foundation from which the tower crane has been removed. Therefore, the equipment foundation of this facility can be effectively utilized to construct a combined foundation, and the tower crane can be pre-installed using the combined foundation before constructing the building foundation main body, and the building foundation main body can be efficiently constructed using the tower crane.

[0009] The second characteristic configuration of the present invention is that the equipment foundation has an equipment foundation main body installed on the ground, The specification change from the equipment foundation to the combined foundation includes a change to increase the mass of the equipment foundation main body.

[0010] According to this configuration, when changing the specification from the equipment foundation to the combined foundation, by increasing the mass of the equipment foundation main body, it is possible to improve the bearing capacity against the pulling force generated by the lifting weight of the tower crane due to the increase in the mass, and it is also possible to suitably take measures against the vibration of the equipment due to the increase in the mass.

[0011] The third characteristic configuration of the present invention is that the equipment foundation has an equipment foundation main body installed on the ground and settlement suppression piles buried in the ground to suppress the settlement of the equipment foundation main body. The specification change from the equipment foundation to the combined foundation includes adding reinforcing bars against the pulling force at the joint between the equipment foundation body and the head of the settlement suppression pile.

[0012] According to this configuration, when changing the specification from the equipment foundation to the combined foundation, by adding reinforcing bars against the pulling force at the joint between the equipment foundation body and the head of the settlement suppression pile, it is possible to prevent the joint from being damaged by the pulling force generated by the lifting weight of the tower crane on the settlement suppression pile, and to make the settlement suppression pile also bear the pulling force generated by the lifting weight of the tower crane, thereby improving the bearing capacity against the pulling force.

[0013] The fourth characteristic configuration of the present invention is that the specification change from the equipment foundation to the combined foundation includes a change to increase the pulling resistance of the settlement suppression pile.

[0014] According to this configuration, when changing the specification from the equipment foundation to the combined foundation, by increasing the pulling resistance of the settlement suppression pile of the equipment foundation, the bearing capacity against the pulling force generated by the lifting weight of the tower crane can be further improved.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0016] Embodiments of the building method of the present invention will be described with reference to the drawings. First, with reference to FIGS. 1 to 3, the foundation part Bk of the building B constructed by this building method will be described.

[0017] As shown in FIG. 1, the foundation part Bk of this building B is provided with a building foundation 1 that supports the upper building part Bb (see FIG. 7) and an equipment foundation 2 that supports the equipment F (see FIG. 7) installed on the upper side. Further, a combined foundation 3 (the hatched part in FIG. 1) is provided, which is a specification change that can also be used as a tower crane foundation for supporting the tower crane TC (see FIG. 5) for the equipment foundation 2 that supports the equipment F installed on the upper side.

[0018] As shown in FIG. 1, the building foundation 1 is arranged in a grid pattern in plan view. The equipment foundation 2 is arranged in a rectangular space formed inside the grid-shaped building foundation 1. The equipment foundation 2 is arranged in all of the rectangular spaces formed inside the grid-shaped building foundation 1, but some of the equipment foundations 2 are specification-changed and constructed as a combined foundation 3 that also serves as a tower crane foundation. In this embodiment, for example, three equipment foundations 2 shown by hatching in FIG. 1 are specification-changed to the combined foundation 3.

[0019] As shown in FIGS. 1 and 7, the building foundation 1 is provided with a building foundation main body 11 made of reinforced concrete installed on the ground G (see FIG. 2) and piles 12 buried in the ground G below the building foundation main body 11. The building foundation main body 11 has footings 11A arranged with column intervals in the arrangement direction of the columns P (see FIG. 7) constituting the building part Bb (the vertical and horizontal directions in FIG. 1), and a large number of foundation beams 11B arranged in a grid pattern across adjacent footings 11A. The piles 12 are arranged below each footing 11A of the building foundation main body 11 and support the load of the upper building part Bb.

[0020] As shown in FIGS. 1 and 2, the equipment foundation 2 is formed in a number of rectangular spaces surrounded by the foundation beams 11B on the inner side of the building foundation body 11 in plan view. The equipment foundation 2 is provided with a reinforced concrete equipment foundation body 21 installed on the ground G, and a plurality of (four in the illustrated example) settlement suppression piles 22 buried in the ground G below the equipment foundation body 21 to suppress the settlement of the equipment foundation body 21. The equipment foundation body 21 is configured in a rectangular parallelepiped shape with a planar shape corresponding to the rectangular space. In addition, as shown in FIG. 2, a vibration transmission prevention layer 4 made of polystyrene foam or the like is interposed between the equipment foundation body 21 and the foundation beam 11B. This vibration transmission prevention layer 4 prevents the vibration caused by the operation of the equipment F supported on the upper surface of the equipment foundation body 21 from being transmitted to the building foundation 1.

[0021] As shown by the hatching in FIG. 1 and in FIG. 3, the combined foundation 3 is formed in a plurality of rectangular spaces surrounded by the foundation beams 11B on the inner side of the building foundation body 11 in plan view, and is dispersedly arranged at a plurality of locations in the building area in plan view.

[0022] The combined foundation 3 is provided with a reinforced concrete combined foundation body 31 having a larger mass than the equipment foundation body 21 as a specification change from the equipment foundation 2. For example, when comparing FIGS. 2 and 3, the combined foundation body 31 shown in FIG. 3 has the same planar shape (the area in plan view) as the equipment foundation body 21 shown in FIG. 2, and the thickness dimension T3 is larger than the thickness dimension T2 of the equipment foundation body 21, so that the mass is larger than that of the equipment foundation body 21. By making the mass of the combined foundation body 31 larger than that of the equipment foundation body 21 in this way, it is possible to improve the bearing capacity against the pulling force generated by the hoisting of the tower crane TC (see FIG. 5) due to the increase in the mass, and it is also possible to suitably take vibration countermeasures for the equipment F (see FIG. 7) due to the increase in the mass.

[0023] In addition, the combined foundation 3 is provided with a combined pile 32 shown in FIG. 3 with a larger pull-out resistance than the settlement suppression pile 22 shown in FIG. 2 as a specification change from the equipment foundation 2. For example, the combined pile 32 is made to have a pile length (e.g., 40 m) longer than that of the settlement suppression pile 22 (e.g., 10 m). Also, although not shown in the drawings, the settlement suppression pile 22 is assumed not to have a root fixing portion (not shown in the drawings) formed of cement or the like at the lower end of the pile, whereas the combined pile 32 is assumed to have a root fixing portion (not shown in the drawings). By these specification changes, the pull-out resistance of the combined pile 32 is made larger than that of the settlement suppression pile 22.

[0024] Furthermore, as a specification change from the equipment foundation 2 to the combined foundation 3, as shown in FIG. 2, at the joint portion between the pile head 22A of the settlement suppression pile 22 and the equipment foundation main body 21, no reinforcing bars are arranged. On the other hand, as shown in FIG. 3, at the joint portion between the pile head 32A of the combined pile 32 and the combined foundation main body 31, pile head reinforcing bars 32a and circumferential pile reinforcing bars 32b are arranged as reinforcing bars. For example, a plurality of pile head reinforcing bars 32a are arranged in a state of extending upward from the outer peripheral portion of the pile head 32A, and a plurality of circumferential pile reinforcing bars 32b are arranged in a state of surrounding the periphery of the pile head 32A. By adding the reinforcing bars 32a and 32b to the joint portion between the pile head 32A of the combined pile 32 and the combined foundation main body 31 in this way, it is possible to suppress the joint portion from being damaged by the pull-out force generated by the lifting weight of the tower crane TC.

[0025] The combined foundation 3 is configured to be capable of serving as both an equipment foundation 2 that supports the equipment F installed on the upper side and a tower crane foundation that supports the tower crane TC by including the specification changes from the equipment foundation 2 as described above.

[0026] Next, this building method will be described with reference to FIGS. 4 to 7. This building method includes a "pile installation process and combined foundation pre-construction process (see FIG. 4)" that is performed prior to the construction of the building foundation main body 11, a "tower crane installation process (see FIG. 5)", a "subsequent construction process (see FIG. 6)", and an "equipment installation process (FIG. 7)", and is a method of performing these processes in order. Hereinafter, the details of each process will be described.

[0027] (Pile installation process and combined foundation pre-construction process) As shown in FIGS. 4(A) and 4(B), in the pile installation process and the combined foundation pre-construction process, prior to the construction of the building foundation body 11, piles 12 of the building foundation 1, settlement suppression piles 22 of the equipment foundation 2, and combined piles 32 of a plurality of combined foundations 3, which are a modified version of some of the equipment foundations 2 dispersed in plan view, are embedded in the ground G. Note that in FIG. 4(B), the piles 12, settlement suppression piles 22, and combined piles 32 are omitted.

[0028] Then, at the installation locations of the combined piles 32 of each combined foundation 3 (the construction locations of the combined foundation body 31), steel bars, pile head reinforcement bars 32a, pile circumference reinforcement bars 32b, etc. of the combined foundation body 31 are arranged, and concrete is placed to construct the combined foundation body 31. In this way, prior to the construction of the building foundation body 11, the piles 12 of the building foundation 1, the settlement suppression piles 22 of the equipment foundation 2, and the combined foundations 3 are constructed.

[0029] (Tower Crane Installation Process) As shown in FIG. 5, in the tower crane installation process that is carried out after the pile installation process and the combined foundation pre-construction process, tower cranes TC are installed on the upper surfaces of the combined foundation bodies 31 in a state of being supported by a plurality of combined foundations 3.

[0030] (Subsequent Building Process) As shown in FIG. 6(A), in the subsequent building process that is carried out after the tower crane installation process, the building foundation body 11 is constructed using the installed tower crane TC. For example, when the building foundation body 11 is made of in-situ concrete, steel bars are arranged at the construction locations of the footing 11A and the foundation beam 11B, necessary formwork is installed, and then concrete is placed in a state where a vibration transmission prevention layer 4 is attached to the outer peripheral surface of the combined foundation body 31. Also, for example, when the building foundation body 11 is made of precast concrete, precast concrete members are arranged at the construction locations of the footing 11A and the foundation beam 11B with a vibration transmission prevention layer 4 interposed between the outer peripheral surface of the combined foundation body 31, and these members are joined. At this time, by using the tower crane TC to transport reinforcing bars, formwork, precast concrete members, etc., the building foundation main body 11 can be efficiently constructed.

[0031] Furthermore, as shown in Fig. 6(B), the equipment foundation main body 21 is constructed in the rectangular space surrounded by the foundation beam 11B of the building foundation main body 11. For example, with a vibration transmission prevention layer 4 attached to the portions located around the rectangular space in the building foundation main body 11, the equipment foundation main body 21 is constructed by arranging reinforcing bars in the rectangular space and placing concrete. Also at this time, by using the tower crane TC to transport the reinforcing bars, etc., the equipment foundation main body 21 can be efficiently constructed. Note that the construction order of the building foundation main body 11 and the equipment foundation main body 21 can be changed according to various circumstances such as the conditions at the construction site. Also, in the subsequent building construction process, the building part Bb (refer to the virtual line in Fig. 7) is constructed on the building foundation main body 11 using the tower crane TC. Then, when the use of the tower crane TC is completed, the tower crane TC is removed.

[0032] (Equipment installation process) As shown in Fig. 7, in the equipment installation process that is carried out after removing the tower crane TC, the equipment F is installed on the upper surface of the equipment foundation main body 21 of the equipment foundation 2 and on the upper surface of the combined foundation main body 31 of the combined foundation 3 from which the tower crane TC has been removed, respectively.

[0033] As described above, this building method performs the "pile installation process · combined foundation pre-construction process", "tower crane installation process", "subsequent building process", and "equipment installation process" in sequence, thereby effectively utilizing the equipment foundation 2 of this facility to pre-install the tower crane TC before constructing the building foundation main body 11, and using the tower crane TC to efficiently construct the building foundation main body 11, the equipment foundation main body 21, and the building part Bb.

[0034] 〔Alternative embodiment〕 Another embodiment of the present invention will be described. Note that the configurations of the embodiments described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0035] (1) In the above embodiment, the case where the building foundation 1, the equipment foundation 2, and the combined foundation 3 are each provided with the pile 12, the settlement suppression pile 22, and the combined pile 32 was shown as an example. However, when the bearing capacity can be ensured only by each of the building foundation main body 11, the equipment foundation main body 21, and the combined foundation main body 31, etc., the pile 12, the settlement suppression pile 22, and the combined pile 32 can be omitted.

[0036] (2) In the above embodiment, the case where the specification change from the equipment foundation 2 to the combined foundation 3 includes three changes, i.e., the change of increasing the mass of the equipment foundation main body 21, the change of adding a reinforcing bar against the pulling force at the joint between the equipment foundation main body 21 and the pile head portion 22A of the settlement suppression pile 22, and the change of increasing the pulling resistance of the settlement suppression pile 22, was shown as an example. Instead of this, any one or two of these three changes may not be included. For example, it may be only the change of increasing the mass of the equipment foundation main body 21, or only the change of adding a reinforcing bar against the pulling force at the joint between the equipment foundation main body 21 and the pile head portion 22A of the settlement suppression pile 22, or only the change of increasing the pulling resistance of the settlement suppression pile 22. Also, other changes may be included.

[0037] (3) In the above embodiment, the case where the building foundation main body 11 has a structure having a footing 11A and a foundation beam 11B was shown as an example. However, for example, it may have a structure having a foundation slab (pressure-resistant slab), etc.

Explanation of Reference Numerals

[0038] 1 Building foundation 2 Equipment foundation 3 Combined foundation 11 Building foundation main body 21 Equipment foundation main body 22 Settlement suppression pile 22A Pile head portion 32A Pile head portion 32a Pile head reinforcement (reinforcement bar) 32b Pile circumference reinforcement (reinforcement bar) B Building F Equipment G Ground TC Tower crane

Claims

1. A building construction method in which a building having an equipment foundation provided on the inner side of a building foundation main body in plan view is constructed using a tower crane installed on a tower crane foundation, comprising: a combined foundation pre-construction step of constructing a combined foundation in which the equipment foundation is redesigned to be usable as the tower crane foundation prior to the construction of the building foundation main body; a tower crane installation step of installing a tower crane in a state of being supported by the constructed combined foundation; a subsequent construction step of constructing the building foundation main body using the installed tower crane; and an equipment installation step of installing equipment on the combined foundation from which the tower crane has been removed.

2. The equipment foundation has an equipment foundation main body installed on the ground, The building construction method according to claim 1, wherein the specification change from the equipment foundation to the combined foundation includes a change to increase the mass of the equipment foundation main body.

3. The equipment foundation has an equipment foundation main body installed on the ground and a settlement suppression pile buried in the ground to suppress the settlement of the equipment foundation main body, The building construction method according to claim 1 or 2, wherein the specification change from the equipment foundation to the combined foundation includes a change to add a reinforcing bar against the pulling force at the joint between the equipment foundation main body and the pile head of the settlement suppression pile.

4. The building construction method according to claim 3, wherein the specification change from the equipment foundation to the combined foundation includes a change to increase the pulling resistance of the settlement suppression pile.

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