JP5923400B2 - How to assemble true pillar - Google Patents

Description

  The present invention relates to a structure pillar assembly method. Specifically, the present invention relates to a method for assembling a structural pillar that is inserted into a cast-in-place pile and supports a ground floor when a building is constructed by a reverse driving method.

Conventionally, in order to shorten the construction period, there is a case where a building is constructed by a reverse driving method.
In this case, pile concrete is placed by excavating a pile hole in the ground. At this time, a structural pillar is inserted into the pile concrete, and the lower end portion of the structural pillar is integrated with the cast-in-place pile. Then, while excavating the ground, the basement floor is constructed in order downward, and at the same time, the ground floor steel frame is connected to the upper end portion of the structural pillar, and the ground floor is constructed in order upward.
As a result, the construction of the underground floor and the construction of the ground floor can be carried out simultaneously, so that the construction period can be shortened.

  Here, when the depth of the underground frame is deep, the true pillar becomes long, but it is difficult to lay it horizontally on the ground and lift it with a crane. Therefore, it has been proposed to divide the structural pillar into an upper part and a lower part and to join the structural pillar with the upper part and the lower part of the construction pillar.

The first method is a structure in which the upper and lower parts of the structural pillar are joined with a base plate. When inserting the structural pillar into the pile hole, first insert the lower part of the divided structural pillar into the pile hole. In this state, the pile concrete in the pile hole is hardened to construct a pile in which the lower part of the structural pillar is fixed (see Patent Document 1).
Next, the ground is excavated until the lower part of the true pillar is exposed, and then the upper base plate of the true pillar is bolted to the lower base plate of the true pillar. At this time, since the bolt is inserted into the loose hole of the base plate, it is possible to adjust the tilt of the upper part of the true pillar to the lower part of the true pillar.

  In the second method, a hole is formed by excavation, and the upper part and the lower part of the construction pillar are joined inside the hole. At this time, a plurality of inclinometers are attached to the stem and the erection is adjusted based on the value of the inclinometer.

Japanese Patent No. 3890666

However, in the first method, the lower part of the true pillar is inserted into the excavated pile hole, but it is difficult to correct the fall of the lower part of the true pillar.
In addition, in order to connect the upper part of the structural pillar to the lower part of the structural pillar, it is necessary to excavate to some extent, and there is a problem that the start of the construction on the ground floor is delayed even if the backlash method is adopted. It was.
On the other hand, in the second method, it is difficult to collect the inclinometer, which may increase the construction cost.

  It is an object of the present invention to provide a method for assembling a structural pillar that can be assembled quickly and accurately at a low cost when a structural pillar is assembled by joining a plurality of column members. .

The method for assembling the true pillar according to claim 1 (for example, the true post assembling method 1 to be described later) includes two pillar members (for example, to be described later) constituting the true pillar (for example, the true pillar 2 to be described later). The column members 10) are joined to each other to form a vertical hole (for example, a vertical hole 20 described later) by excavating the ground, and the two column members are erected in the vertical hole. In the state, from the step of temporarily joining up and down by a plurality of jacks provided on the side surface of the joint portion between the two column members (for example, step S4 described later) and the column core at the lower column member A step of stretching a steel wire (for example, piano wires 13 and 15 described later) from a position separated from a predetermined dimension (for example, a predetermined dimension d described later) to a position separated by a predetermined dimension from the column core of the upper column member ( For example, step S5), which will be described later, and the contact between the two temporarily joined column members. In Part vicinity, so that the steel wire through a position apart a predetermined distance from the pole core, wherein the plurality of jacks to adjust the distance between the junction of the two column members, said lower column member And a step (for example, step S6 described later) for correcting the fall of the upper column member with respect to the above.

  According to this invention, the steel wire is stretched, and the fall of the upper column member with respect to the lower column member is adjusted so that the distance from the steel wire to the column core matches the predetermined dimension. Therefore, since the straightness of the structural pillar can be accurately measured with a simple measurement method, the structural pillar can be assembled quickly and accurately at low cost.

  In addition, when the column members are assembled in a laid state, a large work yard is required, and a large heavy machine is required to build the assembled column. However, according to the present invention, the structural pillar is assembled in a vertical state formed in the ground in a state of being built up. Therefore, a large work yard is not required, and the column members need only be lifted one by one with a crane, so that a large heavy machine is also unnecessary.

  According to the present invention, the fall of the upper column member with respect to the lower column member is adjusted so that the steel wire is stretched and the distance from the steel wire to the column core is adjusted to a predetermined dimension. Therefore, since the straightness of the structural pillar can be accurately measured with a simple measurement method, the structural pillar can be assembled quickly and accurately at low cost.

It is a side view of a construction pillar assembled by a construction pillar assembly method according to an embodiment of the present invention. 3 is a flowchart of a method for assembling a structural pillar according to the embodiment. It is a figure for demonstrating the procedure which assembles a construction pillar by the construction pillar assembly method which concerns on the said embodiment. It is a figure for demonstrating the procedure which assembles a true pillar by the method of assembling a true pillar concerning the modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a structural pillar 2 assembled by a structural pillar assembling method 1 according to an embodiment of the present invention.
The structural pillar 2 is, for example, a steel pipe having a rectangular cross section, and is configured by connecting three pillar members 10 vertically.

  The column member 10 has four side surfaces 10A, 10B, 10C, and 10D that are substantially orthogonal to each other.

  Further, the side surfaces 10A and 10B adjacent to the upper and lower ends of the column member 10 are provided with steel wire holding portions 11 each holding a piano wire 13 as a steel wire and made of an angle material. When the piano wire is held by the steel wire holding portion 11, the distance from the column core of the column member 10 to the piano wire is a predetermined dimension d.

  Further, on the side surfaces 10 </ b> A and 10 </ b> C that are back to back on the top of the column member 10, a supported portion 12 that is supported by a support device 30 described later is provided.

Next, the procedure for assembling the structural pillar 2 will be described with reference to the flowchart of FIG.
In step S1, the vertical hole 20 is formed by excavating the ground as shown in FIG.

In step S <b> 2, as shown in FIG. 3A, a support device 30 for supporting the column member 10 is installed in the vertical hole 20.
The support device 30 is installed at the upper end edge of the vertical hole 20 to support the supported portion 12 of the column member 10 and move up and down, for example, two vertical jacks 31, and installed at the upper end edge of the vertical hole 20. For example, four upper horizontal jacks 32 disposed to face the upper side surfaces 10A to 10D of the member 10 and, for example, four disposed to the inside of the vertical hole 20 and opposed to the lower side surfaces 10A to 10D of the column member 10. A lower horizontal jack 33.

  In step S3, as shown in FIG. 3A, the column member 10 is inserted into the vertical hole 20 in a state of being lifted and built up by a crane, and the supported portion 12 of the column member 10 is supported by the vertical jack 31 of the support device 30. Support. Thereby, the upper part of the column member 10 is exposed to the ground. At this time, it is not necessary to strictly manage the vertical accuracy of the column member 10.

In step S4, as shown in FIG. 3A, in a state where the column member 10 is lifted and built up by a crane, the column member 10 is placed on the column member 10 already inserted into the vertical hole 20, and the tilt adjustment device 40 is installed. The column members 10 are temporarily joined to each other.
The fall adjustment device 40 is a jack provided with a total of four sets, one on each of the side surfaces 10A to 10D of the upper and lower column members 10. For example, the fall adjustment device 40 provided at the joint portion of the side surface 10A adjusts the distance between the joint portions of the column member 10 on the side surface 10A side.

  In step S5, as shown to Fig.3 (a), in each side surface 10A, 10B, the steel wire holding part 11 of the upper side of the pillar member 10 of the upper side from the lower steel wire holding part 11 of the lower side column member 10 is shown. Until then, stretch the piano wire 13. In FIG. 3A, the piano wire 13 is shown only on the side surface 10A for easy understanding. As a result, the piano wire 13 extends from a position separated from the column core on the lower side of the lower column member 10 by a predetermined dimension d to a position separated from the column core on the upper side of the upper column member 10 by a predetermined dimension d. Will be stretched.

  Next, the distance from the column core to the piano wire 13 is measured using a scale 14 that is a measuring instrument in the middle portion between the two column members 10, that is, in the vicinity of the joint portion between the column members 10. Specifically, since the dimensions from the column core to the side surfaces 10A and 10B of the column member 10 are known in advance, the distance from the side surfaces 10A and 10B of the column member 10 to the piano wire 13 is measured with the scale 14, and the column core is measured. The distance from the column core to the piano wire 13 is obtained by adding to the dimensions of the column member 10 to the side surfaces 10A and 10B.

  In step S6, the measured value of the scale 14 is compared with the predetermined dimension d so that the measured value of the scale 14 becomes the predetermined dimension d, that is, the piano wire 13 is a column in the middle part of the two column members 10. The tilt adjustment device 40 is driven so as to pass the position away from the core by a predetermined dimension d to adjust the tilt with respect to the lower column member 10 of the upper column member 10.

  For example, as shown in FIG. 3A, when the measured value is larger than the predetermined dimension d, the upper column member 10 falls to the side surface 10 </ b> A side where the piano wire 13 is stretched with respect to the lower column member 10. Yes. Therefore, the tilt adjustment device 40 provided on the side surface 10A is driven to erect the upper column member 10 on the side surface 10C side.

On the other hand, when the measured value is smaller than the predetermined dimension d, the upper column member 10 is tilted to the side surface 10C opposite to the side surface 10A where the piano wire 13 is stretched with respect to the lower column member 10. Therefore, the tilt adjustment device 40 provided on the side surface 10C is driven to erect the upper column member 10 on the side surface 10A side.
As described above, by adjusting the tilt of the upper column member 10 on the side surfaces 10A and 10B, the tilt is adjusted in the X direction and the Y direction orthogonal to each other in the horizontal plane.

  In step S <b> 7, it is determined whether or not the joining of all the column members 10 has been completed, and when this determination is Yes, the assembly of the structural pillar 2 is completed. On the other hand, in the case of No, the process proceeds to step S8.

  On the other hand, in step S <b> 8, the joined two column members 10 are slid downward, and the supported portion 12 of the upper column member 10 is supported by the vertical jack 31 of the support device 30. Thereafter, the process returns to step S4, and steps S4 to S6 are repeated as shown in FIG.

According to this embodiment, there are the following effects.
(1) The piano wire 13 is stretched, and the fall of the upper column member 10 with respect to the lower column member 10 is adjusted so that the distance from the piano wire 13 to the column core matches the predetermined dimension d. Therefore, since the linearity of the structural pillar 2 can be accurately measured by a simple measurement method, the structural pillar 2 can be assembled quickly and accurately at low cost.

  (2) In the vertical hole 20 formed in the ground, the structural pillar 2 was assembled in a state of being built up. Therefore, a large work yard is not required, and the column members 10 need only be lifted one by one with a crane, so that large heavy machinery is also unnecessary.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

For example, in this embodiment, the piano wire 13 is stretched only on the side surface 10A. However, the present invention is not limited to this, and the piano wire 15 may be stretched also on the side surface 10C opposite to the side surface 10A as shown in FIG. .
In this case, in step S5, the distance from the column core to the piano wire 15 is measured using the scale 16 that is a measuring instrument in the middle portion between the two column members 10, that is, in the vicinity of the joint portion between the column members 10. In step S6, the measured value of the scale 14 is compared with the measured value of the scale 16, and the tilt adjustment device 40 is driven so that the measured value of the scale 14 becomes equal to the measured value of the scale 16. The fall with respect to the column member 10 on the lower side of the column member 10 is adjusted.

d ... predetermined dimensions 1 ... construction pillar assembly method 2 ... construction pillar 10 ... column members 10A, 10B, 10C, 10D ... side face 11 ... steel wire holding part 12 ... supported parts 13, 15 ... piano wire 14,16 ... Scale 20 ... Vertical hole 30 ... Support device 31 ... Vertical jack 32 ... Upper horizontal jack 33 ... Lower horizontal jack 40 ... Tilt adjustment device

Claims (1)

A construction pillar assembly method for joining two pillar members constituting a construction pillar,
A vertical hole is formed by excavating the ground, and the two column members are built up and down in the vertical hole, and are vertically moved by a plurality of jacks provided on the side surface of the joint portion between the two column members. A temporary joining step;
From the position separated from the column core in the lower column member by a predetermined distance to the position separated from the column core in the upper column member by a predetermined dimension,
In the vicinity of the joint portion between the two column members that are temporarily joined, the plurality of jacks between the joint portions of the two column members so that the steel wire passes through a position that is a predetermined distance away from the column core . Adjusting the distance, and correcting the fall of the upper column member with respect to the lower column member.

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