JP2023008648A - building construction method - Google Patents

Abstract

To provide a building construction method which lowers a position of a jack mounted on an inverted support and can improve verticality of the inverted column built in a pile hole.SOLUTION: A building construction method for constructing a building by an inverted construction method includes the steps of: inserting an inverted support 1 having a stud mounting planned part 3 on the upper side of an embedded part 2 into a pile hole 31; supporting the inverted support 1 on a trestle 34 installed in a foundation 30 and a jack 20 mounted on the stud mounting planned part 3 in a vertical attitude; placing concrete 38 in the pile hole 31, and fixing the inverted support 1 to a concrete hole; excavating the ground 30, and then mounting a plurality of studs 50 on the stud mounting planned part 3 from which the jack 20 has been removed; and placing the concrete and forming a horizontal member 39 where the plurality of studs 50 are buried.SELECTED DRAWING: Figure 4

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a building construction method for constructing a building by an inverse construction method.

A reverse construction method is known as a construction method for constructing a building having a ground portion and an underground portion. In the reversed construction method, before excavating the ground to construct the underground structure, the ground is excavated by erecting reversed pillars to support the above-ground part of the building in the pile holes provided in the ground. While constructing the underground structure, such as forming a pressure-resistant board, it is possible to construct the above-ground part on the upside-down pillars in parallel. As a result, the construction period of the building can be shortened compared to the method of proceeding with the construction of the above-ground part after completing the construction of the underground part.

In such a reverse-casting method, the reverse-casting post is fixed to the cast-in-place concrete pile at the embedded portion by pouring concrete into the pile hole after being inserted into the pile hole (first-in method). Alternatively, after concrete is poured into the pile hole, it is inserted into the concrete and fixed to the cast-in-place concrete pile at the embedded portion (post-installation method).

Conventionally, in order to support the upside-down post in a vertical position in the pile hole until the concrete pile hardens, a pantograph-type jack is attached to the side of the upside-down post, and the upside-down post is inserted into the pile hole. A technique is known in which a post is supported in a vertical position at two points, a mount placed on the ground and a jack in contact with the wall surface of a pile hole (see, for example, Patent Document 1).

In addition, conventionally, a plurality of studs are arranged side by side at intervals in the vertical and horizontal directions on the side surface of the upper part of the embedded part of the upside-down post, and the upside-down post is inserted into the pile hole and fixed to the concrete pile. After that, when pouring concrete into the bottom of the ground excavated to the upper end of the concrete pile to form a pressure-resistant board, the studs are buried in the pressure-resistant board so that the reverse-strike support and the pressure-resistant board are integrated. is known (see Patent Document 2, for example).

JP 2014-218862 A JP 2013-256793 A

If the upside-down pillars are fixed to the concrete piles at an angle to the vertical direction, it will greatly affect the connection with the beams and the construction of the above-ground parts. Therefore, it is required to support the upside-down strut in a vertical position with high accuracy. In order to accurately support the upside-down support in a vertical position with the support frame and jack, it is effective to attach the jack to the lower part of the upside-down support as much as possible to widen the space between the support base and the jack in the vertical direction. is.

However, in the above-described prior art, since a plurality of studs for integrating the reverse-struck strut with the pressure plate are pre-attached at the factory to the upper portion of the embedded part of the reverse-stretched strut, the jack is attached to the reverse-stretched strut. There was a problem that it was necessary to install the jack above the part where the stud was attached, and the jack could not be installed by lowering it to the position directly above the insertion part of the reverse hammering strut.

The present invention has been made in view of the above problems, and its object is to lower the position of the jack attached to the reverse-strike strut to increase the verticality of the reverse-strike strut built into the pile hole. It is to provide an object construction method.

The building construction method of the present invention is a building construction method for constructing a building by an upside-down construction method, in which an upside-down support having a stud mounting portion above an embedded portion is placed in a pile hole provided in the ground. In the step of inserting into the ground, and the jack mounted on the stud mounting portion and in contact with the wall surface of the pile hole, the reverse driven support inserted into the pile hole is in a vertical position A step of supporting, a step of casting concrete into the pile hole to fix the reverse-cast post to the concrete pile at the embedded portion, and after excavating the ground, attaching the stud with the jack removed. The method is characterized by comprising a step of attaching a plurality of studs to a planned portion and a step of placing concrete to form a horizontal member in which the plurality of studs are embedded.

Advantageous Effects of Invention According to the present invention, it is possible to provide a building construction method capable of lowering the position of a jack attached to an inverted strut and increasing the verticality of an inverted strut erected in a pile hole.

FIG. 2 is a front view of a state in which jacks and jacks of reverse-strike struts used in a building construction method according to an embodiment of the present invention are attached; It is a figure which shows the detail of a jack. (a) is a diagram showing a pile hole provided in the ground, and (b) is a diagram showing a state in which a reinforcing bar is built into the pile hole shown in (a) of the figure. (a) is a diagram showing a state in which the upside-down post shown in FIG. 1 is inserted into a pile hole, and (b) is a diagram showing a state in which concrete is placed in the pile hole into which the upside-down post is inserted. be. After excavating the ground to the upper end position of the concrete pile, it is a figure which shows the state which attached several studs to the stud attachment planned part from which the jack was removed. It is a figure which shows the state which poured concrete to the bottom part of the ground even above the stud installation schedule part, and formed the pressure-resistant board|substrate.

Hereinafter, a building construction method according to an embodiment of the present invention will be described in detail with reference to the drawings.

A reverse-strike support 1 shown in FIG. 1 is erected in a pile hole provided in the ground in a building construction method according to an embodiment of the present invention.

The upside-down strut 1 is formed in a straight columnar shape with a predetermined length from a steel pipe with a rectangular cross section. The inside of the counterstrike support 1 is hollow. An embedded part 2 is formed in the lower part from the lower end of the reversed strut 1 to a predetermined height. The embedded portion 2 is a portion of the reverse-cast support 1 that is inserted into concrete placed in a pile hole and fixed to a concrete pile in which the concrete has hardened.

The reverse-strike strut 1 has a stud mounting portion 3 on the upper side of the embedded portion 2. - 特許庁In the present embodiment, a part from the upper end of the embedded part 2 of the reversed strut 1 to a predetermined height serves as a stud attachment planned part 3 . The stud attachment portion 3 is a portion to which a stud is attached for integrating the reverse-strike support 1 with horizontal members such as beams, slabs, pressure-resistant plates, etc., which constitute the underground portion of the building. In the building construction method of the present embodiment, the stud is not yet attached to the side surface of the stud mounting portion 3 of the reverse driven support 1 when the reverse driven support 1 is inserted into the pile hole. The stud mounting portion 3 may have, for example, a mounting hole 3a for inserting a stud, but may have no mounting hole 3a.

The inverted strut 1 is not limited to a configuration in which the entirety from the upper end to the lower end is formed of a steel pipe with a rectangular cross section. The shape or configuration can be changed as appropriate, such as a configuration that

When inserting the reversed strut 1 into the pile hole, a yattko (temporary pile) 10 may be attached to the upper end of the reversed strut 1. - 特許庁The jack 10 is, for example, formed in a straight and hollow columnar shape of a predetermined length from a steel pipe with a rectangular cross section having the same dimensions as the inverted strut 1, and is equipped with a pair of hanging hooks 11 at the upper end and a pair of hanging hooks 11 at the side. A configuration in which a plurality of fall-prevention blade-like stoppers 12 are fixed can be used.

In the building construction method of the present embodiment, a jack 20 is attached to the side surface of the stud mounting portion 3 of the reverse driven support 1 to be inserted into the pile hole. In the present embodiment, jacks 20 are attached to four side surfaces of the inverted strut 1 having a rectangular cross section. In addition, in FIG. 1, only three jacks 20 are shown for convenience. The jack 20 may be attached to the side surface of the stud mounting portion 3 of the reverse-strike support 1 before inserting the reverse-strike support 1 into the pile hole, and after inserting the reverse-strike support 1 into the pile hole, the front reverse-strike The inside of the pile hole may be lowered along the strut 1 to be mounted on the side surface of the stud mounting portion 3 .

In the building construction method according to the present embodiment, when inserting the reversed strut 1 into the pile hole, the stud is not attached to the stud mounting scheduled portion 3, so the stud mounting scheduled portion 3 of the reversed strut 1 A jack 20 can be attached to the side. It is preferable that the jack 20 is mounted as low as possible on the side surface of the stud mounting portion 3 of the reversed strut 1 .

As the jack 20, for example, as shown in FIG. A pantograph type having a link mechanism 24 to which a pressing plate 23 is rotatably connected to one end can be used. In this case, the jack 20 is fixed to the side surface of the stud attachment portion 3 of the reverse-strike strut 1 on the base plate 21 . One of the links of the jack 20 is driven by the drive rod 22a of the hydraulic cylinder 22, so that the link mechanism 24 extends and contracts in the horizontal direction. Control of the operation of jack 20 can be done remotely from outside the pile hole.

Next, a procedure for constructing a building by the reverse construction method using the building construction method according to the present embodiment will be described.

First, as shown in FIG. 3( a ), a drilling device such as a drill is used to dig a predetermined depth at the planned erection position of the reversed strut 1 on the ground 30 of the construction site where the building is constructed by the reversed construction method. excavate the pile hole 31 of . In the illustrated case, the shape of the pile hole is a cylinder whose diameter increases only at the bottom, but the shape can be changed as appropriate. Next, as shown in FIG. 3( b ), a reinforcing bar 32 is erected at a predetermined position on the bottom side of the pile hole 31 .

Next, as shown in FIG. 4( a ), the inverted strut 1 having the Yatco 10 attached to the upper end and four jacks 20 attached to the stud mounting portion 3 was connected to the hanging hook 11 of the Yatco 10 . It is suspended by a crane (not shown) using a wire 33 and inserted into the pile hole 31 from the lower end side. At this time, a pedestal 34 is installed above the opening of the pile hole 31 , and guide rollers 35 provided on the pedestal 34 guide the reverse driven support 1 and the yattco 10 and insert them into the pile hole 31 in a vertical posture.

When the reversed strut 1 is inserted to a position where the lower end thereof reaches a predetermined depth in the pile hole 31, the stopper 12 is supported by the frame 34, and the reversed strut 1 is held at that position. The vertical position of the reverse-strike strut 1 is adjusted by a journal jack 36 provided on a frame 34. - 特許庁In this way, the reverse driven strut 1 is supported by the frame 34 via the jack 10 in a state of being inserted into the pile hole 31 to a predetermined depth.

Next, the four pantograph-type jacks 20 are opened to bring the pressing plate 23 into contact with the wall surface of the pile hole 31 . As a result, the upside-down post 1 is supported in a vertical position at two vertically separated positions, the mount 34 installed on the ground 30 and the jack 20 having the pressing plate 23 in contact with the wall surface of the pile hole 31 . Further, by adjusting the degree of opening of the four pantograph-type jacks 20 and the position of the guide roller 35, the verticality of the reverse-strike strut 1 is appropriately adjusted to be within a predetermined range. The verticality of the reverse-strike support 1 can be measured using an inclinometer (not shown) attached to the outer peripheral surface of the reverse-strike support 1 .

Here, in the building construction method according to the present embodiment, when inserting the upside-down support 1 into the pile hole 31 provided in the ground 30, the upper stud mounting portion of the embedded portion 2 of the upside-down support 1 3, since the jack 20 is attached without attaching the stud, the stud is attached in advance, so that the jack can be attached only above the part of the reverse-strike strut where the stud is attached. Compared to the conventional method, the jack 20 can be attached to a lower part of the counterstrike support 1. - 特許庁Therefore, the space between the pedestal 34 and the jack 20 in the vertical direction is made wider than that of the conventional one, and the pedestal pillar 1 can be supported in a vertical position with higher accuracy by the pedestal 34 and the jack 20.例文帳に追加

In addition, in the building construction method according to the present embodiment, the Yatsuko 10 is attached to the upper end of the reverse-strike support 1, and the reverse-strike support 1 inserted into the pile hole 31 is supported by the pedestal 34 via the Yatsuko 10. Therefore, the position of the support point on the upper side of the pedestal 34 of the reverse-struck strut 1 can be arranged on the upper side. Therefore, the space between the mount 34 and the jack 20 in the vertical direction is made wider than when the yattco 10 is not used, and the mount 34 and the jack 20 support the reverse-strike strut 1 in a vertical posture with higher accuracy. be able to.

Next, as shown in FIG. 4( b ), the tremie pipe 37 is erected in the pile hole 31 while the reverse-strike support 1 is supported in the vertical position by the mount 34 and the jack 20 , and the pile hole 31 is passed through the tremie pipe 37 . Concrete 38 is placed in the interior of the slab from the bottom to the height of the upper end of the embedding part 2. - 特許庁When the concrete 38 is placed inside the pile hole 31 , the embedded part 2 of the reinforcing bar 32 and the reversed support 1 is buried inside the concrete 38 . When the concrete 38 placed inside the pile hole 31 hardens, the reverse-cast pillar 1 is fixed to the hardened concrete 38, that is, the cast-in-place concrete pile in which the reinforcing bars 32 are embedded in the embedded portion 2. In this way, the upside-down post 1 is fixed to the concrete pile at the embedded portion 2 .

If necessary, a predetermined number of upside down struts 1 required for the building are fixed to concrete piles of a predetermined number of pile holes 31 provided in the ground 30 in the same procedure.

When all the reversed pillars 1 are fixed to the concrete (concrete piles) 38 of the pile holes 31, the jacks 10 and the four jacks 20 are removed, and after the pile holes 31 are backfilled, as shown in FIG. While proceeding with the work of constructing the ground part 40 of the building supported by the hammered pillars 1, the embedded part 2 of the reversed pillars 1 is set so that the ground 30 has the necessary width for constructing the underground part. Excavate up to the upper end of the concrete pile to be fixed.

Next, a plurality of studs 50 are attached to the stud attachment portion 3 exposed outside by excavation of the ground 30 and from which the jack 20 has been removed. The plurality of studs 50 are, for example, arranged side by side with predetermined intervals in the vertical and horizontal directions. Only one stud 50 is labeled in FIG. 5 for convenience. Each stud 50 is attached so as to project from the side surface of the counterstrike support 1 with its head portion facing outward. The plurality of studs 50 may be fixed to the stud mounting portion 3 by, for example, screwing into mounting holes 3a provided in the stud mounting portion 3, or may be fixed to the stud mounting portion 3 by welding or the like. may

Next, as shown in FIG. 6, concrete is cast from a tremie pipe 37 to the bottom of the ground 30 to form a horizontal member 39 such as a beam, a slab, or a pressure-resistant board that constitutes the underground portion 41 of the building. Form. FIG. 6 shows a case where a pressure-resistant board is formed as a horizontal member 39 on the bottom of the ground 30 . At this time, since the plurality of studs 50 attached to the surface of the stud attachment portion 3 of the reversed strut 1 are positioned inside the concrete, when the horizontal member 39 hardens, the studs 50 are embedded in the horizontal member 39 and reversed. The driving post 1 and the horizontal member 39 are integrated. After the horizontal members 39 have been formed, work proceeds to construct the subterranean portion 41 of the building.

As described above, in the building construction method according to the present embodiment, the jack 20 is attached to the stud mounting portion 3 above the embedded portion 2 of the reverse-strike support 1 without attaching a stud, and the reverse-strike support 1 is is supported in a vertical position in the pile hole 31 provided in the ground 30, so that the stud is attached in advance, so that the jack can be attached only above the part where the stud of the reverse-strike strut is attached. The jack 20 can be mounted on the lower portion of the reverse-strike support 1 compared to the conventional method in which it is impossible to do so. As a result, according to the building construction method according to the present embodiment, the space between the pedestal 34 and the jack 20 in the vertical direction is made wider than in the conventional one, and the upside-down pillar 1 can be further moved by the pedestal 34 and the jack 20. It can be supported in a vertical position with good accuracy.

Further, in the building construction method according to the present embodiment, after concrete 38 is poured into the pile hole 31 to fix the reverse-cast support 1 to the concrete pile at the embedded portion 2, the ground 30 is extended to the upper end position of the concrete pile. After excavating and removing the jack 20 from the stud mounting scheduled portion 3 of the reverse driven strut 1, a plurality of studs 50 are attached to the stud mounting scheduled portion 3, so that the reverse driven strut with pre-mounted studs is attached to the pile hole. As in the prior art in which it is inserted, the studs 50 are embedded in the horizontal member 39 formed by pouring concrete into the bottom of the ground 30, and the reverse-strike support 1 and the horizontal member 39 can be integrated. .

Furthermore, in the building construction method according to the present embodiment, after fixing the upside-down support 1 to the concrete pile, when excavating the ground 30 to the upper end position of the concrete pile, the stud attachment planned portion 3 of the upside-down support 1 Since the stud 50 is not attached to the stud 50, the ground in the vicinity of the reverse-strike support 1 can be easily excavated by heavy machinery or the like without damaging the stud. In addition, before the stud 50 is attached to the stud mounting portion 3 of the reversed strut 1, by performing pile head processing for processing the excess embankment of the concrete pile, the pile head processing can be easily performed without damaging the stud. can.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, as the jack 20 to be mounted on the stud mounting portion 3 of the reversed strut 1, a pantograph type jack as shown in FIG. Jacks 20 of other constructions may be used as long as they are mounted and capable of supporting the reverse driven struts 1 inside the pile holes 31 so as to be able to adjust their horizontal positions.

Further, in the above-described embodiment, after the reverse-cast support 1 is inserted into the pile hole 31, the concrete 38 is poured into the pile hole 31 (first-in method). After installation and before the concrete 38 hardens, the reverse-strike support 1 may be inserted into the pile hole 31 (post-insertion construction method).

1 reversed strut 2 embedded portion 3 stud mounting portion 3a mounting hole 10 jack 11 hanging hook 12 stopper 20 jack 21 base plate 22 hydraulic cylinder 22a drive rod 23 pressing plate 30 ground 31 pile hole 32 reinforcing bar 33 wire 34 pedestal 35 Guide roller 36 Journal jack 37 Tremy pipe 38 Concrete 39 Horizontal member 40 Ground part 41 Underground part

Claims (1)

A building construction method for constructing a building by a reverse construction method,
A step of inserting a reverse-strike support having a stud mounting portion on the upper side of the embedded portion into a pile hole provided in the ground;
A step of supporting the reverse-strike support inserted into the pile hole in a vertical posture in the mount installed on the ground and the jack attached to the stud mounting portion and in contact with the wall surface of the pile hole;
A step of casting concrete into the pile hole and fixing the counter-strike support to the concrete pile at the embedded portion;
After excavating the ground, attaching a plurality of studs to the stud attachment portion from which the jack has been removed;
and C. placing concrete to form horizontal members in which the plurality of studs are embedded.

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