JP2014080836A - Vertical accuracy management method of under-ground piled column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical accuracy management method of an under-ground piled column capable of sufficiently managing vertical accuracy when the under-ground piled column is built in a pile hole in the case that the under-ground piled column is not cylindrical or even in the case that the under-ground piled column is long.SOLUTION: A vertical accuracy management method of an under-ground piled column includes: a step of installing a cylindrical measurement pipe 14 on an outer surface of the under-ground piled column 1 so as to be approximately parallel to a column core of the under-ground piled column 1 and installing a target plate 15 on an end side of the measurement pipe 14 on ground; a step of inserting the under-ground piled column 1 into a pile hole 2 with the measurement pipe 14 and supporting an upper end part of the under-ground piled column 1 by a frame 11 for the under-ground piled column installed on ground; a step of installing a laser plummet instrument 17 right above the measurement pipe 14 on ground and radiating laser light vertically below through the measurement pipe 14 by the laser plummet instrument 17; and a step of measuring deviation of the under-ground piled column 1 by sighting a point of the laser light on the target plate 15 and correcting plumbing of the under-ground piled column 1 based on the measured deviation.

Description

  The present invention relates to a vertical accuracy management method for a structural pillar. More specifically, the present invention relates to a vertical accuracy management method for a built-up column when a built-up column is built into a pile hole excavated in the ground.

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, for example, a pile hole is excavated in the ground, a reinforcing steel basket is inserted into the pile hole, and pile concrete is placed. Is integrated into the 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.

By the way, since the above-mentioned structural pillar constitutes an underground frame, it is necessary to ensure accuracy when the structural pillar is built. Therefore, it is conceivable to measure the inclination of the structural pillar and correct the construction of the structural pillar based on the measurement result. For example, the following three methods of measuring the inclination of the structural pillar can be used. A method has been proposed.
First, for a tubular column such as a CFT column, a target is installed at the lower end inside the column and the target is collimated by a vertical instrument installed directly above the column (for example, a patent) Reference 1).
Second, a positioning tube is provided on the outer surface of the stem column, and a float is provided on the positioning tube. The position of the float in the positioning tube is detected by an ultrasonic sensor, and the vertical accuracy of the structural pillar is measured (see Patent Document 2).
Third, a tube is provided on the outer surface of the stem column, a weight is suspended in the tube, and a target and a television camera are installed at the lower end of the tube. And the deviation | shift amount of a target and a weight is measured with a television camera (refer patent document 3).

JP 2011-21392A Japanese Patent Laid-Open No. 6-129777 Japanese Patent Laid-Open No. 7-3825

However, in the first method, since the internal space of the construction pillar is used, it is not possible to adopt a construction pillar that is not cylindrical, such as a precast concrete structure or a cross-shaped cross section (cross H).
In addition, it is required that the inclination of the structural pillar is within 1/1000. However, in the second and third methods, since the weight and the floating are swayed, only an inclination of about 1/500 is measured. could not. Therefore, there is a problem that the vertical accuracy cannot be sufficiently managed, for example, for a long structure column of 40 m or longer.

  The present invention provides a vertical accuracy management method for a structural column that can manage the vertical accuracy with high accuracy when the structural column is built into a pile hole even when the structural column is not cylindrical or when the structural column is long. The purpose is to provide.

  The vertical accuracy management method for a structural pillar according to claim 1 is used when a structural pillar (for example, a later-described structural pillar 1) is installed in a pile hole (for example, a later-described pile hole 2) excavated in the ground. , A vertical accuracy management method for managing the vertical accuracy of the true pillar, on the ground, a cylindrical measuring tube (for example, so as to be substantially parallel to the pillar core of the true pillar on the outside of the true pillar) And a step (for example, step S1 to be described later) of providing a target plate (for example, a target plate 15 to be described later) on the distal end side of the measurement tube, A step of inserting the measuring tube into the pile hole and supporting the upper end portion of the built-up column by a built-up column stand provided on the ground (for example, step S2 described later), and a laser directly on the measuring tube on the ground An irradiation apparatus (for example, a laser vertical device 17 described later) is provided, and the laser irradiation apparatus More collimating a step (for example, steps S4 and S6 described later) irradiating laser light vertically downward through the measuring tube and a point (for example, point 153 described later) by the laser beam on the target plate, A step (for example, Steps S7 and S8 described later) of measuring the displacement of the structural pillar and correcting the construction of the structural pillar based on the measured displacement.

According to this invention, the point by the laser beam on the target plate is collimated, the deviation of the true pillar is measured, and the construction of the true pillar is corrected based on the measured deviation. Therefore, it is possible to manage the vertical accuracy even for non-cylindrical structural pillars such as precast concrete structures and cross-shaped cross sections (cross H).
In addition, since the vertical accuracy of the structural pillar was measured using a laser irradiation device, the swing of the point becomes smaller and the measurement accuracy can be improved compared to the conventional case of using a weight or float. The vertical accuracy can be managed with high accuracy even for a long column having a total length of 40 m or more.

  According to a second aspect of the present invention, there is provided a method for controlling the vertical accuracy of a prism, wherein a light source (for example, a backlight 152 described later) is provided in the vicinity of the target plate.

If the length of the measuring tube is increased, the amount of light entering the measuring tube is reduced, and the target plate may not be visible from the upper end of the measuring tube.
Therefore, according to the present invention, since the light source is provided in the vicinity of the target plate, the target plate becomes bright, so that the target plate can be reliably recognized.

  The vertical accuracy management method for a structural pillar according to claim 3 is a vertical accuracy management method for managing the vertical accuracy of the structural pillar when the structural pillar is built in a pile hole excavated in the ground, On the ground, a step of providing a measurement tube on the outside of the true column so as to be substantially parallel to the column core of the true column, and further providing a target plate on the tip side of the measurement tube, and the true column Is inserted into the pile hole together with the measuring tube, and the upper end of the built-up column is supported by a built-up column mount provided on the ground, and an optical vertical device is vertically mounted on the ground directly above the measuring tube. Aligning the target plate through the vertical device and measuring the misalignment of the structural pillar, and correcting the construction of the structural pillar based on the measured displacement And a process.

  According to the present invention, there is an effect similar to that of the first aspect.

  According to the present invention, the point of the laser beam on the target plate is collimated, the deviation of the true pillar is measured, and the construction of the true pillar is corrected based on the measured deviation. Therefore, it is possible to manage the vertical accuracy even for non-cylindrical structural pillars such as precast concrete structures and cross-shaped cross sections (cross H). In addition, since the vertical accuracy of the structural pillar was measured using a laser irradiation device, the swing of the point becomes smaller and the measurement accuracy can be improved compared to the conventional case of using a weight or float. The vertical accuracy can be managed with high accuracy even for a long column having a total length of 40 m or more.

It is a side view of a construction pillar to which the vertical accuracy management method concerning one embodiment of the present invention was applied. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a top view of the target board of the vertical accuracy management method concerning the embodiment. 3 is a flowchart of a vertical accuracy management method according to the embodiment.

[First Embodiment]
FIG. 1 is a side view of a structural pillar to which a vertical accuracy management method for the structural pillar according to an embodiment of the present invention is applied. 2 is a cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line BB in FIG.
The structural pillar 1 has a rectangular cross section and is used for the reverse driving method, and is inserted into a pile hole 2 excavated in the ground. A stand pipe 3 is driven into the upper portion of the pile hole 2, and a reinforcing steel cage (not shown) is arranged at the bottom of the pile hole 2, and concrete is cast into the cast-in-place pile 4. The lower end of the true pillar 1 is inserted into the cast-in-place pile 4.

The vertical accuracy of the true pillar 1 is managed by the vertical accuracy management system 10.
The vertical accuracy management system 10 is provided on the ground and supports the upper end of the structural pillar 1 via a Yatco 12 and measures the position of the upper end of the structural pillar 1 provided on the ground. A three-dimensional measuring device 13, a cylindrical measuring tube 14 provided outside the stem 1 and extending along the column core, a target plate 15 provided on the lower end side inside the measuring tube 14, and the ground A measurement stand 16 provided on the laser stand, a laser vertical device 17 as a laser irradiation device provided at a position immediately above the measurement tube 14 of the measurement stand 16, and a CCD camera as an imaging device attached to the laser vertical device 17. 18, an inclinometer 19 provided on the upper outer peripheral surface of the structural pillar 1, and four underwater jacks 20 provided on the lower outer peripheral surface of the structural pillar 1.

The true pillar column 11 can adjust the upper end of the true pillar 1 in the X, Y, and Z directions, and can rotate the true pillar 1 around the pillar core of the true pillar as a rotation axis.
The three-dimensional measuring device 13 is a transit, a level, a total station, or the like, and measures the position in the three-dimensional space of the upper end of the stem 1 based on the position of the reference point.
The measurement tube 14 has a cylindrical shape, and for example, a galvanized steel tube (white gas tube), a square pipe, a round pipe, or the like is used.

FIG. 4 is a plan view of the target plate 15.
The target plate 15 is an acrylic plate, for example, and is provided so as to close the lower end surface of the measurement tube. On the upper surface of the target plate 15, straight lines indicating the X direction and the Y direction are drawn. The intersection of these straight lines is the center point 151 on the target plate 15 and is separated from the column core of the structural pillar 1 by a predetermined dimension d.
A battery-type backlight 152 as a light source is provided on the lower surface of the target plate 15.

The laser vertical unit 17 irradiates laser light downward in the vertical direction. The laser light emitted from the laser vertical device 17 reaches the target plate 15 through the inside of the measuring tube 14 and becomes a point 153 on the target plate 15 (see FIG. 4).
The CCD camera 18 is connected to a monitor (not shown), images the irradiation direction of the laser beam of the laser vertical device 17 and displays it on the monitor.

The inclinometer 19 measures the inclination of the true pillar 1.
The underwater jack 20 is extendable and is installed between the outer surface of the stem pillar 1 and the inner wall surface of the pile hole 2. By extending and contracting the underwater jack 20, the distance from the inner wall surface of the pile hole 2 at the lower part of the stem column 1 can be adjusted, and the inclination of the stem column 1 can be adjusted.

  Next, the procedure for managing the vertical accuracy of the structural pillar 1 will be described with reference to the flowchart of FIG.

In step S1, the true pillar 1 is grounded. That is, the structural pillar 1 is assembled on the ground by connecting the structural members of the structural pillar 1. At this time, the measuring tube 14 is attached to the outside of the true pillar 1 substantially in parallel with the pillar core of the true pillar 1.
Further, a target plate 15 is attached to the distal end side of the measuring tube 14 and adjusted so that the distance from the pillar core of the built-up column to the center point 151 of the target becomes a predetermined dimension d.

  In step S 2, the built-up column base 11 is installed in the pile hole 2, the Yatco 12 is attached to the built-up column 1, and the built-up column 1 is inserted into the pile hole 2 together with the measuring tube 14 to a predetermined depth.

  In step S <b> 3, the upper end of the true pillar 1 is temporarily fixed to the true pillar base 11. At this time, the position of the upper end portion of the true pillar 1 is measured by the three-dimensional measuring device 13, and the true pillar base 11 is operated based on the measurement result, so that the upper end portion of the true pillar 1 is set to a predetermined position. I will keep it.

  In step S4, the measurement mount 16 is installed in the pile hole 2. A laser vertical unit 17 and a CCD camera 18 are attached to the measurement base 16. Here, the posture of the laser vertical device 17 is adjusted, and the irradiation direction of the laser light is set downward in the vertical direction.

  In step S5, the inclination of the true pillar 1 is measured by the inclinometer 19, and the inclination of the true pillar 1 is corrected to some extent based on the measurement result. This is because if the inclination of the true pillar 1 is large, the target plate 15 is removed from the laser beam irradiation direction of the laser vertical device 17 and the inclination of the true pillar 1 cannot be measured.

  In step S <b> 6, laser beam is irradiated toward the target plate 15 by the laser vertical device 17. Then, the laser light emitted from the laser vertical device passes through the inside of the measurement tube 14 to the target plate 15 and irradiates the point 153 on the target plate 15.

  In step S7, the inclination of the true pillar 1 is measured with high accuracy. That is, the backlight 152 is turned on to brighten the target plate 15, and in this state, the CCD camera 18 collimates and shoots the target plate 15 and displays it on the monitor. And the deviation | shift amount of the center point 151 of the target board 15 and the point 153 irradiated with the laser beam is measured.

Since the center point 151 of the target plate 15 is a position away from the column core by a predetermined dimension d, if the point 153 coincides with the center point 151, the column core of the construction column 1 is in a vertical state.
For example, when the point 153 is positioned on the target plate 15 in the positive direction of the X axis, the column core of the structural pillar 1 is tilted in the positive direction of the X axis (that is, the column base of the structural pillar is It is tilted in the negative direction of the X axis).

In step S8, the inclination of the column 1 is adjusted by using an erection adjusting jig such as the underwater jack 20 in a direction in which the amount of deviation between the center point 151 of the target plate 15 and the point 153 irradiated with the laser beam is reduced. The verticality of the true pillar 1 is secured by correcting.
At this time, if necessary, the position of the upper end of the true pillar 1 is measured by the three-dimensional measuring device 13 on the ground to adjust the position and posture of the entire true pillar 1.
Thereafter, the position of the frame pillar 1 is held with an underwater jack 20 or the like.

According to this embodiment, there are the following effects.
(1) The point 153 by the laser beam on the target plate 15 is collimated, the displacement of the structural pillar 1 is measured, and the construction of the structural pillar 1 is corrected based on the measured displacement. Therefore, it is possible to manage the vertical accuracy even for non-cylindrical structural pillars such as precast concrete structures and cross-shaped cross sections (cross H).
In addition, since the vertical accuracy of the structural pillar 1 is measured using the laser vertical device 17, the swing of the point is reduced and the measurement accuracy can be improved as compared with the case of using a conventional weight or float. Therefore, the vertical accuracy can be managed with high accuracy even for a long structural column having a total length of 40 m or more.

  (2) Since the backlight 152 is provided in the vicinity of the target plate 15, the target plate 15 becomes bright, so that the target plate 15 can be visually recognized with certainty.

(3) Since the measuring tube 14 has a cylindrical shape, the measuring tube 14 is hollow and can be removed relatively easily.
(4) If the measuring tube 14 is made to have a length close to the total length of the stem 1, the verticality of the entire stem 1 can be measured, and the vertical accuracy of the stem 1 can be further improved.

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 the present embodiment, the structural pillar 1 is assembled on the ground (ground assembly). However, the structural pillar is not limited to this, and the structural pillar may be assembled in the pile hole. It suffices if the measuring tube can be fixed substantially parallel to the core.

  Further, in the present embodiment, the target plate 15 is visually recognized by photographing the target plate 15 with the CCD camera 18. However, the present invention is not limited thereto, and the target plate 15 may be visually recognized from directly above the measurement tube 14. Then, a camera may be provided on the back surface of the target plate 15 so that the target plate 15 can be photographed from the back side.

  In the present embodiment, the present invention is applied to the prismatic column 1 having a rectangular cross section. However, the present invention is not limited to this. The present invention can also be applied to a shape pillar having a shape.

  Moreover, in this embodiment, the so-called post-post structure construction method in which the post-construction column is built after the pile concrete is cast is adopted. However, the present invention is not limited to this, and the pile concrete is placed after the post-construction column is built. It can also be applied to the so-called structural pillar pre-setting method.

  In the present embodiment, the target plate 15 is collimated using the laser vertical device 17 and the CCD camera 18, but the present invention is not limited to this, and an optical vertical device equipped with a telescope is used to target the target plate 15. The plate may be collimated.

  Moreover, in this embodiment, the measurement stand 16 was provided in the pile hole 2, and the laser vertical device 17 was attached to this measurement stand 16, but not only this but a vertical device has the function to hold | maintain perpendicularity automatically. In some cases, a vertical instrument may be attached to the stem 1 or Yatco 12.

DESCRIPTION OF SYMBOLS 1 ... Construction pillar 2 ... Pile hole 3 ... Stand pipe 4 ... Cast-in-place pile 10 ... Vertical accuracy control system 11 ... Construction pillar pillar 12 ... Yatco 13 ... Three-dimensional measuring device 14 ... Measuring tube 15 ... Target plate 16 ... Measurement Base 17 ... Laser vertical device (laser irradiation device)
18 ... CCD camera 19 ... Inclinometer 20 ... Underwater jack 151 ... Center point 152 ... Back light (light source)
153 ... Point

Claims (3)

A vertical accuracy management method for managing the vertical accuracy of a structural pillar when building the structural column in a pile hole excavated in the ground,
On the ground, providing a measurement tube on the outside of the true column so as to be substantially parallel to the column core of the true column, and further providing a target plate on the tip side of the measurement tube;
Inserting the true pillar into the pile hole together with the measuring tube, and supporting the upper end of the true pillar by a true pillar mount provided on the ground;
Providing a laser irradiation device directly above the measurement tube on the ground, and irradiating the laser beam vertically downward through the measurement tube with the laser irradiation device;
Collimating the point by the laser beam on the target plate, measuring the displacement of the structural pillar, and correcting the construction of the structural pillar based on the measured displacement. A vertical accuracy control method for the structural column.   The method of claim 1, wherein a light source is provided in the vicinity of the target plate. A vertical accuracy management method for managing the vertical accuracy of a structural pillar when building the structural column in a pile hole excavated in the ground,
On the ground, providing a measurement tube on the outside of the true column so as to be substantially parallel to the column core of the true column, and further providing a target plate on the tip side of the measurement tube;
Inserting the true pillar into the pile hole together with the measuring tube, and supporting the upper end of the true pillar by a true pillar mount provided on the ground;
On the ground, a step of providing an optical vertical device directly above the measurement tube in a vertically downward direction;
Collimating the target plate through the vertical instrument, measuring the displacement of the structural pillar, and correcting the construction of the structural pillar based on the measured displacement, How to control the vertical accuracy of the structural pillar.

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