JP7621901B2 - Installation accuracy assessment method - Google Patents

Description

The present invention relates to a technology for an installation accuracy determination method that determines the installation accuracy of a jig that supports a measurement unit having a laser range finder.

Technology for pumping concrete into steel pipes for CFT structures has been publicly known. For example, see Patent Document 1.

Patent document 1 describes a method of filling the internal space of a steel pipe by using a pump truck to inject concrete into a concrete injection port at the bottom of the steel pipe.

In the method described in the above-mentioned Patent Document 1, a laser beam emitted from a laser range finder is used to measure the distance to the top of the concrete filled inside the steel pipe at a specified measurement level. This makes it possible to confirm the filling height (pressing level) of the concrete.

The measurement unit having the above-mentioned laser range finder is supported so as to be located inside the steel pipe on the measurement floor by a jig that is inserted through the concrete injection port of the steel pipe.

When installing such a jig, there is a possibility that the jig may not be installed correctly, for example, if the direction of the laser range finder relative to the top edge of the concrete is misaligned. If the jig is not installed correctly, the accuracy of the measurement results of the concrete filling height will also be low. Therefore, it is desirable to improve the accuracy of determining whether the jig has been installed correctly.

JP 2020-118013 A

The present invention was made in consideration of the above situation, and the problem it aims to solve is to provide an installation accuracy determination method that can improve the accuracy of determining whether the jig that supports the measurement unit is installed correctly.

The problem that the present invention aims to solve is as described above, and the means for solving this problem will be explained next.

That is, in claim 1, the method for determining the installation accuracy of a jig supporting a measuring unit having a laser range finder that measures the distance from above the concrete pressed into a steel pipe for a CFT structure to the top of the concrete when the measuring unit is installed includes an installation step of installing the jig at a predetermined position, an insertion step of inserting a target member that receives laser light irradiated from the laser range finder into the steel pipe through an insertion hole that is formed below the predetermined position and above the lowest end of the internal space of the steel pipe and penetrates the side of the steel pipe, a first distance measurement step of measuring a first distance, which is the distance in the height direction from the laser range finder to the target member, by the laser range finder, a second distance measurement step of measuring a second distance, which is the distance in the height direction from the laser range finder to the lowest end of the internal space of the steel pipe, by the laser range finder, and a determination step of determining whether the jig has been correctly installed by comparing a value obtained by subtracting the first distance from the second distance with the height dimension from the lowest end of the internal space of the steel pipe to the insertion hole.

In claim 2, the insertion hole is a filling confirmation hole for visually checking whether concrete has been filled to the planned filling height, or a steam vent hole for venting steam from the internal space of the steel pipe.

In claim 3, the target member is formed to extend in one direction and includes an irradiated portion that receives the laser light irradiated from the laser range finder, and a fixed portion that fixes the irradiated portion to the steel pipe, and the fixed portion is formed to be perpendicular to the extension direction of the irradiated portion and includes an abutment surface that can abut against the outer surface of the steel pipe.

In claim 4, the fixed portion is made of a magnetic material.

In claim 5, the irradiated portion is formed so that its area in plan view can be expanded when inserted into the steel pipe.

The effects of the present invention are as follows:

In claim 1, it is possible to improve the accuracy of determining whether the jig supporting the measurement unit is correctly installed.

In claim 2, it is not necessary to form a new hole for inserting the target member.

In claim 3, the abutment surface of the fixed part is abutted against the steel pipe, so that the horizontality of the extension direction of the irradiated part can be maintained.

In claim 4, the target member can be easily fixed to the steel pipe.

In claim 5, the reliability of irradiating the irradiated part with laser light from the laser range finder can be improved without increasing the size of the insertion hole.

A cross-sectional view showing a concrete-filled steel pipe column with the top floor fixture installed. FIG. 4 is a block diagram showing the configuration of a measurement unit. A cross-sectional view showing a concrete-filled steel pipe column with an intermediate floor fixture installed. FIG. 11 is a flowchart showing a method for determining installation accuracy. A cross-sectional view showing a distance measurement method using a laser range finder supported by an intermediate floor jig. FIG. 4 is a perspective view showing a state in which a target member is fixed to a steel pipe. A cross-sectional view showing a distance measurement method using a laser range finder supported by a top floor jig. FIG. 11 is a cross-sectional view showing a method for measuring distance after concrete is filled. FIG. 11 is a perspective view showing a state in which a target member used in the installation accuracy determination method according to the second embodiment is fixed to a steel pipe. 13A is a plan view showing a first state of a target member used in a placement accuracy determination method according to a third embodiment, and FIG. 13B is a plan view showing the target member in a second state.

In the following explanation, the forward/backward, left/right, and up/down directions will be defined based on the arrows in the diagram.

The installation accuracy determination method according to one embodiment of the present invention determines the installation accuracy of a jig 10 that supports a measurement unit 1. The measurement unit 1 measures the injection speed of concrete 8 injected into a steel pipe 7 that constitutes a pillar of a building with a CFT structure (concrete filled steel pipe structure).

Below, we will first use Figures 1, 3, and 4 to explain the structure of a column (hereinafter referred to as a "concrete-filled steel pipe column 6") in a CFT-structure building.

As shown in FIG. 1, the concrete-filled steel pipe column 6 is formed by filling the internal space of the steel pipe 7 with concrete 8. Hereinafter, the bottom (lowest end) of the concrete-filled steel pipe column 6 is referred to as the column bottom 6a. The steel pipe 7 is a rectangular tubular member made of steel (iron). The steel pipe 7 may also be cylindrical. The steel pipe 7 is formed across each floor of the building. The steel pipe 7 has an insertion hole 7a and a diaphragm 7b.

The insertion hole 7a is a hole formed so as to penetrate the side surface (one side surface) of the steel pipe 7 in the front-rear direction. Concrete 8 is pressed into the internal space of the steel pipe 7 through the insertion hole 7a. The insertion hole 7a is provided at a position corresponding to at least the ground floor Fa of the building. In addition, the insertion hole 7a is provided at a position corresponding to a predetermined intermediate floor Fn as necessary (see FIG. 9).

The side of the steel pipe 7 is provided with a filling confirmation hole 7e that allows visual confirmation of whether the concrete 8 has been filled up to the planned pouring height. The filling confirmation hole 7e is formed below the laser range finder 4 (measurement unit 1) so as to penetrate the side of the steel pipe 7 in the front-to-rear direction.

In addition, the side of the steel pipe 7 is provided with a specified steam vent hole 7f for venting steam from the internal space of the steel pipe 7. A plurality of steam vent holes (e.g., for each floor) are provided at specified intervals along the vertical direction. Note that the number and positions of the steam vent holes 7f can be arbitrary and are not limited to those shown in the figure.

The diaphragm 7b is a horizontal reinforcement that transmits the stress of the beam (not shown) to the concrete-filled steel pipe column 6. A plurality of diaphragms 7b are provided at predetermined intervals along the vertical direction of the steel pipe 7 so as to correspond to the positions of the beams on each floor of the building. The diaphragm 7b is in the shape of a plate arranged with its thickness direction facing the vertical direction. The diaphragm 7b is rectangular in plan view. Note that the plan view shape of the diaphragm 7b is not limited to a rectangular shape and can be any shape. The diaphragm 7b has a casting hole 7c and an air hole 7d.

The casting hole 7c shown in FIG. 4 is a hole provided to allow concrete 8 to pass through the internal space of the steel pipe 7. The casting hole 7c is provided so as to penetrate the thickness direction of the diaphragm 7b. The casting hole 7c is provided in the center part of the diaphragm 7b in a plan view. The inner diameter dimension of the casting hole 7c is appropriately set from the viewpoint of strength and suitable filling with the concrete 8.

Air hole 7d is a hole for releasing air from the internal space of steel pipe 7. Air hole 7d is provided so as to penetrate diaphragm 7b in the thickness direction. Air hole 7d is provided at the four corners of diaphragm 7b in a plan view. The inner diameter of air hole 7d is formed to be smaller than the inner diameter of casting hole 7c.

Next, we will explain the construction method for the concrete-filled steel pipe column 6 using Figure 1.

First, concrete 8 is pumped from a pump truck to the ground floor Fa of the building and injected into the internal space of the steel pipe 7 through an insertion hole 7a provided on the ground floor Fa of the steel pipe 7. This fills the internal space of the steel pipe 7 with concrete 8, pushing the top end 8a of the concrete 8 upward from below.

The concrete 8 pressed into the internal space of the steel pipe 7 is pressed into the upper floor through the pouring hole 7c of the diaphragm 7b. When the concrete 8 is filled up to the upper end of the steel pipe 7, the pressing of the concrete 8 is stopped. The concrete 8 filled in this way solidifies to form a concrete-filled steel pipe column 6. In the above example, the concrete 8 is pressed into the ground floor Fa, but this is not limited to the above example, and the concrete 8 can also be pressed into the upper floor Fn through the insertion hole 7a provided therein.

Next, the measurement unit 1 will be described using Figures 1 and 2.

The measurement unit 1 is capable of acquiring information about the concrete 8 pressed into the internal space of the steel pipe 7. The measurement unit 1 includes a lighting unit 2, a camera unit 3, and a laser range finder 4.

The lighting unit 2 shown in FIG. 2 illuminates the internal space of the steel pipe 7. The lighting unit 2 has a designated light-emitting element such as a light-emitting diode.

The camera unit 3 captures an image of the internal space of the steel pipe 7. The camera unit 3 has a specified lens unit (not shown).

The laser range finder 4 is capable of measuring the distance from above the concrete 8 pressed into the internal space of the steel pipe 7 to the top edge 8a of the concrete 8. The laser range finder 4 has a specified laser light emitting unit (not shown). As shown in FIG. 1, the laser range finder 4 is aimed at the top edge 8a of the concrete 8 located below and emits a laser light, and measures the distance to the top edge 8a of the concrete 8 by measuring the time it takes for the laser light to be reflected by the top edge 8a of the concrete 8 and return.

The lighting unit 2, camera unit 3 and laser rangefinder 4 are housed inside the case unit (not shown).

The image information from the camera unit 3 and the measurement results from the laser range finder 4 are output to the control unit 290 shown in FIG. 1. The control unit 290 includes a calculation device such as a CPU (Central Processing Unit), and a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The control unit 290 can calculate the injection speed of the concrete 8 in the internal space of the steel pipe 7 using the measurement results from the laser range finder 4.

The injection speed of the concrete 8 and the image information of the camera unit 3 are displayed on a specified monitor. This allows the worker injecting the concrete 8 to control the injection of the concrete 8 while checking the injection speed of the concrete 8 and the state of the internal space of the steel pipe 7.

Next, we will explain the jig 10 used in the installation accuracy determination method according to one embodiment of the present invention.

The jig 10 supports the measurement unit 1 above the top end 8a of the concrete 8 pressed into the internal space of the steel pipe 7. As the jig 10, a top floor jig 100 and an intermediate floor jig 200 are used.

The top floor jig 100 shown in FIG. 1 supports the measurement unit 1 above the upper end of the steel pipe 7. As shown in FIG. 1, the top floor jig 100 is installed on the top floor Fr (rooftop) of the building where the upper end of the steel pipe 7 is located. This allows the measurement unit 1 to be installed on the steel pipe 7.

The intermediate floor jig 200 shown in Figures 3 and 4 supports the measurement unit 1 at an intermediate floor Fn of a building. As shown in Figures 3 and 4, the intermediate floor jig 200 is installed in the vertical middle part of the steel pipe 7. The intermediate floor jig 200 is equipped with a front fixing means 260 and a rear fixing means 270.

The front fixing means 260 shown in FIG. 4 fixes the intermediate floor jig 200 to the inner surface (inner surface at the back) of the steel pipe 7 facing backward. The front fixing means 260 is provided at the front end of the intermediate floor jig 200. As shown in FIG. 4, the front fixing means 260 is fixed to a portion of the inner surface facing backward of the steel pipe 7 that overlaps with the insertion hole 7a in a front view. The front fixing means 260 is capable of switching between generating and not generating magnetic force.

The rear fixing means 270 fixes the intermediate floor jig 200 to the outer surface (the outer surface on the near side) of the steel pipe 7 facing rearward. The rear fixing means 270 is provided at the rear of the intermediate floor jig 200. A pair of rear fixing means 270 are provided on the left and right. The rear fixing means 270 can be switched between generating and not generating magnetic force.

The intermediate floor jig 200 formed as described above is installed, for example, on the intermediate floor Fn as follows:

First, at the intermediate floor Fn, the intermediate floor jig 200 is inserted into the insertion hole 7a of the steel pipe 7 with the measurement unit 1 fixed thereto. Here, the vertical dimension of the measurement unit 1 is larger than the inner diameter dimension of the insertion hole 7a. Therefore, when inserting the intermediate floor jig 200 and the measurement unit 1 into the insertion hole 7a, the measurement unit 1 is appropriately tilted to an extent that it can be inserted into the insertion hole 7a.

Next, with the measurement unit 1 and the front portion of the mid-floor jig 200 positioned in the internal space of the steel pipe 7, the mid-floor jig 200 is moved forward, and the front fixing means 260 is brought into contact with the inner surface facing rearward of the steel pipe 7, while the rear fixing means 270 is brought into contact with the outer surface facing rearward of the steel pipe 7. At this time, the angles of the measurement unit 1 and the mid-floor jig 200 are appropriately adjusted so that they are approximately horizontal.

Next, by appropriately operating the front fixing means 260 and the rear fixing means 270, the intermediate floor jig 200 is supported at three points on the steel pipe 7. This allows the measurement unit 1 to be installed on the steel pipe 7.

Here, if the jigs 10 (the top floor jig 100 and the intermediate floor jig 200) are not installed correctly, the direction of the laser range finder 4 may be shifted, and the laser light may not be irradiated to the top edge 8a of the concrete 8. In particular, since the intermediate floor jig 200 is installed inside the steel pipe 7, it is difficult to visually check whether the intermediate floor jig 200 is installed correctly. For this reason, in the past, in order to check whether the intermediate floor jig 200 is installed correctly, the distance to the column bottom 6a was measured by the laser range finder 4, and if this measured distance (the distance to the column bottom 6a) was approximately the same as the height of the insertion hole 7a through which the laser range finder 4 is inserted, it was determined that the intermediate floor jig 200 was installed correctly.

However, if the insertion hole 7a through which the intermediate floor jig 200 is inserted is large compared to the insertion portion of the intermediate floor jig 200, the installation position (installation height) of the intermediate floor jig 200 will vary depending on the worker. In addition, the height of the insertion hole 7a through which the intermediate floor jig 200 is inserted does not necessarily match the height of the light receiving part of the laser range finder 4. For this reason, it is difficult to obtain an accurate value for the height of the light receiving part of the laser range finder 4, and the above-mentioned method cannot be said to be able to accurately determine whether the intermediate floor jig 200 has been installed correctly.

In this embodiment, when installing the measurement unit 1 on the steel pipe 7 via the intermediate floor jig 200, the installation accuracy of the intermediate floor jig 200 is improved by using the installation accuracy determination method shown in FIG. 5. The installation accuracy determination method shown in FIG. 5 (hereinafter, sometimes simply referred to as the "determination method") will be described below.

First, in step S11, the intermediate floor jig 200 is installed. In this step, the worker installs the intermediate floor jig 200, which supports the measurement unit 1, on the steel pipe 7 at the intermediate floor Fn using the method described above.

Next, in step S12, the target member 30 is inserted. The target member 30 is described below.

The target member 30 shown in Figures 6 and 7 is a member that is the target of the laser light irradiated from the laser rangefinder 4. The target member 30 has an irradiated portion 31 and a fixed portion 32.

The irradiated portion 31 shown in FIG. 7 is a portion that receives the laser light emitted from the laser range finder 4. The irradiated portion 31 is formed of a cylindrical rebar that is long in the front-rear direction. The diameter of the irradiated portion 31 is slightly smaller than the filling confirmation hole 7e through which the irradiated portion 31 is inserted.

The fixing portion 32 is a portion that fixes the irradiated portion 31 to the steel pipe 7. The fixing portion 32 is in the form of a plate arranged with its thickness direction facing the front-rear direction. When viewed from the rear, the fixing portion 32 is in the form of a rectangle whose width is greater than the diameter of the filling confirmation hole 7e. The fixing portion 32 is formed from a magnetic steel plate. The fixing portion 32 is fixed to the lower portion of the irradiated portion 31 by welding or the like so that its longitudinal direction is perpendicular to the longitudinal direction of the irradiated portion 31. The fixing portion 32 is fixed to the midpoint between the front and rear of the irradiated portion 31. The fixing portion 32 has an abutment surface 32a.

The contact surface 32a is the surface of the plate surface of the fixed portion 32 that faces forward and is capable of contacting the outer surface of the steel pipe 7. The contact surface 32a is formed so as to be perpendicular to the extension direction of the irradiated portion 31.

In the target member 30 configured in this manner, the front part of the irradiated part 31 is inserted into the filling confirmation hole 7e of the steel pipe 7 until the abutment surface 32a of the fixing part 32 abuts against the outer surface facing the rear (the outer surface on the near side) of the steel pipe 7. In this way, the fixing part 32 is fixed to the outer surface of the steel pipe 7 by the magnetic force of the fixing part 32.

As a result, the target member 30 is fixed so that the front end (part of the front side) of the irradiated portion 31 is located in the center of the internal space of the steel pipe 7 in a plan view. In other words, the front end of the irradiated portion 31 is positioned so that it can receive the laser light irradiated from the laser range finder 4. In addition, since the abutment surface 32a is formed so as to be perpendicular to the extension direction of the irradiated portion 31, the extension direction of the irradiated portion 31 can be made horizontal by abutting the abutment surface 32a against the outer surface of the steel pipe 7. In addition, since the fixing portion 32 is magnetic, the target member 30 can be easily fixed to the steel pipe 7 (by one person) simply by inserting the irradiated portion 31 through the filling confirmation hole 7e and abutting the abutment surface 32a against the outer surface of the steel pipe 7.

Next, in step S13, the distance L1 to the target member 30 is measured. Specifically, the laser range finder 4 irradiates the target member 30 located below with laser light, and measures the time it takes for the laser light to be reflected by the target member 30 and return, thereby measuring the distance L1 (see FIG. 6) from the laser range finder 4 to the target member 30.

Next, in step S14, the distance L2 to the bottom of the column 6a is measured. Specifically, the worker first removes the target member 30 from the filling confirmation hole 7e. The laser range finder 4 then irradiates the bottom of the column 6a located below with laser light, and measures the time it takes for the laser light to reflect off the bottom of the column 6a and return, thereby measuring the distance L2 (see FIG. 6) from the laser range finder 4 to the bottom of the column 6a.

Next, in step S15, it is determined whether distance L2 - distance L1 is approximately the same height as the insertion position of the target member 30 (distance L2 - distance L1 is approximately the same height as the insertion position of the target member 30). Specifically, it is determined whether the value obtained by subtracting distance L1 (distance to the target member 30) measured in step S13 from distance L2 (distance to the column bottom 6a) measured in step S14 is approximately the same as the height dimension h (design value) of the filling confirmation hole 7e into which the target member 30 is inserted. Here, the height dimension h of the filling confirmation hole 7e may be the vertical distance from the column bottom 6a to the top end of the filling confirmation hole 7e, or the vertical distance from the column bottom 6a to the center of the filling confirmation hole 7e. However, in consideration of the accuracy of the measurement results, it is preferable to adopt the vertical distance from the column bottom 6a to the top end of the filling confirmation hole 7e. However, considering the difference between the diameter of the filling confirmation hole 7e and the outer diameter of the irradiated portion 31 of the target member 30, in order to obtain more accurate measurement results, it is preferable to use the value obtained by adding the diameter of the irradiated portion 31 of the target member 30 to the vertical distance from the column bottom 6a to the lower end of the filling confirmation hole 7e as the height dimension h of the filling confirmation hole 7e. In this step, if the difference between the value obtained by subtracting the distance L1 from the distance L2 and the height dimension h of the filling confirmation hole 7e is equal to or less than a predetermined threshold value, it is determined that the distance L2 - distance L1 is ≒ the insertion position of the target member 30. On the other hand, if the difference between the value obtained by subtracting the distance L1 from the distance L2 and the height dimension h of the filling confirmation hole 7e exceeds the predetermined threshold value, it is determined that the distance L2 - distance L1 is not ≒ the insertion position of the target member 30.

If it is determined that distance L2 - distance L1 is approximately the insertion position of the target member 30 ("YES" in step S15), the process proceeds to step S16. On the other hand, if it is determined that distance L2 - distance L1 is not approximately the insertion position of the target member 30 ("NO" in step S15), the process proceeds to step S17.

In step S16, it is determined that the intermediate floor jig 200 installed in step S11 is correctly installed. Then, the installation method shown in FIG. 5 is terminated.

On the other hand, in step S17, it is determined that the intermediate floor jig 200 has not been installed correctly. Therefore, the worker reinstalls the intermediate floor jig 200. Then, the process returns to step S12.

In this way, the installation of the intermediate floor jig 200 is redone until step S15 is YES.

As described above, if distance L2-distance L1 does not match height dimension h (NO in step S15), the jig 200 for intermediate floors may not be installed correctly. Specifically, the orientation of the laser range finder 4 may be incorrect (the direction of direction is oblique), and the laser light may be irradiated to a location other than the column base 6a (such as the diaphragm 7b). Alternatively, the jig 200 for intermediate floors may be installed in a hole other than the insertion hole 7a where it should be installed. Therefore, by installing the jig 200 for intermediate floors so that distance L2-distance L1 and height dimension h are approximately the same (YES in step S15), the jig 200 for intermediate floors can be installed correctly so that the distance to the top edge 8a of the concrete 8 to be filled can be accurately measured.

In addition, to determine whether the intermediate floor jig 200 is installed correctly, the accuracy of the determination can be improved by comparing the value obtained by subtracting the distance L1 to the target member 30 from the distance L2 to the column base 6a with the height dimension h of the filling confirmation hole 7e into which the target member 30 is inserted.

Specifically, the height dimension h of the filling confirmation hole 7e into which the target member 30 is inserted can be determined from the design value. The irradiated portion 31 of the target member 30 can be kept horizontal by the fixing portion 32. Therefore, the height of the irradiated portion 31 (the portion that receives the laser light) and the height dimension h of the filling confirmation hole 7e can be considered to be roughly the same.

In this way, in step S15, the judgment is made based on the height dimension h of the filling confirmation hole 7e, which allows a relatively accurate value for the height of the irradiated portion 31 (the portion receiving the laser light). Therefore, there is no need to take into account variations in the installation height of the intermediate floor jig 200 or the difference between the height of the insertion hole 7a and the height of the light receiving portion of the laser rangefinder 4, and it is possible to accurately judge whether the intermediate floor jig 200 (laser rangefinder 4) has been installed correctly.

In this way, by using the laser range finder 4 or the like, it is possible to improve the measurement accuracy of the installation height of the intermediate floor jig 200. This improvement in installation accuracy also improves the accuracy of monitoring the injection speed of the concrete 8 and the image information of the camera unit 3 when the concrete 8 is filled. This allows for more accurate construction management when filling the concrete 8, and allows accurate results to be recorded in the construction report. And even if the planned filling height of the concrete 8 differs from the actual height, it is possible to check in advance and consider countermeasures.

The determination method shown in FIG. 5 is used for installing the intermediate floor jig 200, but it can also be used for installing the top floor jig 100. That is, as shown in FIG. 8, a similar method can be used for the top floor jig 100 to accurately determine whether the intermediate floor jig 200 (laser rangefinder 4) has been correctly installed. This will be explained in detail below.

First, in step S11, the top floor jig 100 is installed on the top floor Fr (rooftop) of the building. Next, in step S12, the target member 30 is inserted into any hole (e.g., steam vent hole 7f) provided in the steel pipe 7. The steam vent hole 7f is provided below the measurement unit 1. Then, the distance L1 to the target member 30 and the distance L2 to the column base 6a are measured (steps S13, 14), and the value obtained by subtracting distance L1 from distance L2 is compared with the height dimension h (design value) of the steam vent hole 7f into which the target member 30 is inserted, thereby enabling an accurate determination of whether the top floor jig 100 has been installed correctly.

As described above, the installation accuracy determination method according to this embodiment includes the following steps:
An installation accuracy method for determining the installation accuracy of a jig 10 (an intermediate floor jig 200 or a top floor jig 100) supporting a measurement unit 1 having a laser distance meter 4 that measures the distance from above concrete 8 pressed into a steel pipe 7 for a CFT structure to a top end 8a of the concrete 8, comprising:
An installation step (step S11) of installing the jig 10 at a predetermined position;
An insertion step (step S12) of inserting a target member 30 that receives laser light irradiated from the laser rangefinder 4 into the steel pipe 7 through an insertion hole (filling confirmation hole 7e or steam vent hole 7f) formed below the predetermined position and above the column bottom 6a of the steel pipe 7 and penetrating the side surface of the steel pipe 7;
a first distance measurement step (step S13) of measuring a first distance L1, which is a distance in a height direction from the laser rangefinder 4 to the target member 30, by the laser rangefinder 4;
A second distance measurement step (step S14) of measuring a second distance L2, which is a distance in a height direction from the laser distance meter 4 to the column bottom 6a of the steel pipe 7, by the laser distance meter 4;
A determination step (step S15) of determining whether or not the jig 10 is correctly installed by comparing a value obtained by subtracting the first distance L1 from the second distance L2 with a height dimension h from the column bottom 6a of the steel pipe 7 to the insertion hole;
It is equipped with the following.

By configuring it in this way, it is possible to improve the accuracy of determining whether the jig 10 (intermediate floor jig 200 or top floor jig 100) that supports the measurement unit 1 has been installed correctly.

The insertion hole is,
These are a filling confirmation hole 7e for visually checking whether the concrete 8 has been filled up to the planned pouring height, and a steam vent hole 7f for releasing steam from the internal space of the steel pipe 7.

By configuring it in this way, it is possible to eliminate the need to form a new hole for inserting the target member 30.

In addition, the target member 30 is
an irradiated portion 31 formed to extend in one direction and receiving the laser light irradiated from the measurement unit 1;
A fixing portion 32 that fixes the irradiated portion 31 to the steel pipe 7;
Equipped with
The fixing portion 32 is
It is formed perpendicular to the extension direction of the irradiated portion 31 and has a contact surface 32 a that can come into contact with the outer surface of the steel pipe 7 .

By configuring it in this way, the abutment surface 32a of the fixing part 32 can be abutted against the steel pipe 7, thereby keeping the extension direction of the irradiated part 31 horizontal.

In addition, the fixing portion 32 is
It is made of a magnetic material.

By configuring it in this way, the target member 30 can be easily fixed to the steel pipe 7.

Although an embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

For example, in this embodiment, the installation of the jig 10 using the determination method shown in FIG. 5 is described on the assumption that the steel pipe 7 is not filled with concrete 8 at all, but since the filling of concrete 8 may be performed after a period of time (across days), the jig 10 may be installed again with the steel pipe 7 filled with concrete 8 to a certain extent. In this case, in step 14 shown in FIG. 5, the determination is made using the distance L3 (see FIG. 9) to the top end 8a of the filled concrete 8 instead of the distance L2 to the column bottom 6a. That is, in step 14, the distance to the bottom end (column bottom 6a or top end 8a of the concrete 8) of the internal space of the steel pipe 7 is used regardless of whether or not the filled concrete 8 is present. Then, in the case where the concrete 8 is filled to a certain extent in the steel pipe 7, in step S15, the value obtained by subtracting the distance L1 from the distance L3 is compared with the value obtained by subtracting the filling height H of the concrete 8 from the height dimension h of the filling confirmation hole 7e into which the target member 30 is inserted, to determine whether the jig 10 is correctly installed. The filling height H of the concrete 8 is the value measured the previous time the concrete 8 was filled.

The target member 30 may be provided on the floor where the jig 10 is installed, or on a floor below the floor where the jig 10 is installed.

In addition, in this embodiment, the distance L1 to the target member 30 (step S13) is measured, followed by the distance L2 to the column base 6a (step S14), but the measurement order is not limited to this, and the distance L2 may be measured first, followed by the distance L1.

The shape of the target member 30 is not limited to that of this embodiment. Below, we will use Figure 10 to explain the target member 40 used in the determination method according to the second embodiment of the present invention.

The target member 40 used in the determination method according to the second embodiment differs from the target member 30 used in the determination method according to the first embodiment in that it has an irradiated portion 41 instead of the irradiated portion 31. Therefore, in the following, the same components as those in the first embodiment are given the same reference numerals and will not be described.

The irradiated portion 41 is a portion that receives the laser light irradiated from the laser rangefinder 4. The irradiated portion 41 is formed from a steel plate that is long in the front-rear direction. The irradiated portion 41 is arranged with the plate surface facing up-down. The irradiated portion 41 is inserted into the filling confirmation hole 7g that is formed in a slit shape. Below the irradiated portion 41, the fixing portion 32 is fixed by welding or the like at the midpoint of the front-rear part of the irradiated portion 41.

By forming the irradiated portion 41 in this manner, the portion that receives the laser light irradiated from the laser rangefinder 4 can be made flat, making it easier for the laser light to strike it.

Below, the target member 50 used in the determination method according to the third embodiment of the present invention will be described with reference to FIG. 11.

The target member 50 used in the determination method according to the third embodiment differs from the target member 30 used in the determination method according to the first embodiment in that it has an irradiated portion 60 instead of an irradiated portion 31. Therefore, in the following, the same components as those in the first embodiment are denoted by the same reference numerals and will not be described.

The irradiated portion 60 is a portion that receives the laser light irradiated from the laser rangefinder 4. The irradiated portion 60 includes a first member 61, a second member 62, a third member 63, a fourth member 64, and a fifth member 65.

The first member 61 is a part that supports the second member 62, which will be described later. The first member 61 is formed of a member that is long in the front-rear direction. The first member 61 is arranged with its plate surface facing the up-down direction. The first member 61 is inserted into the filling confirmation hole 7e, similar to the irradiated portion 31 of the target member 30 used in the first embodiment (see FIG. 7). Below the first member 61, a fixing portion 32 is fixed by welding or the like at the midpoint of the front-rear portion of the first member 61.

The second member 62 is formed of a member that is long in the front-rear direction. The second member 62 is formed so that its longitudinal length is shorter than the longitudinal length of the first member 61. The second member 62 is provided so as to be slidable in the front-rear direction on the upper surface of the first member 61.

The third member 63 is formed of a member that is long in the front-rear direction. The third member 63 is supported rotatably around a pivot shaft 63a relative to the front end of the second member 62. A pair of third members 63 are provided on the left and right.

The fourth member 64 is formed of a member that is long in the front-rear direction. The fourth member 64 is supported to be rotatable around a pivot shaft 64a relative to the front end of the third member 63. The fourth member 64 is also supported to be rotatable around a pivot shaft 64b relative to the front end of the first member 61. A pair of fourth members 64 are provided on the left and right.

The fifth member 65 is formed in the area surrounded by the third member 63 and the fourth member 64. The fifth member 65 has a relatively high reflectance to laser light and is formed from a material that is stretchable.

The irradiated portion 60 thus configured is formed so that its shape can be switched between a state in which the portion surrounded by the third member 63 and the fourth member 64 is closed (first state shown in FIG. 11(a)) and a state in which the portion surrounded by the third member 63 and the fourth member 64 is open (second state shown in FIG. 11(b)).

The method for arranging the target member 50 is described below.

First, with the irradiated portion 60 in the first state (see FIG. 11(a)), the target member 50 is inserted into the filling confirmation hole 7e (see FIG. 7) from the fourth member 64 side.

Next, with the third member 63, the fourth member 64, and the fifth member 65 inserted inside the steel pipe 7, the second member 62 is slid forward relative to the first member 61. Then, since the front end of the fourth member 64 is supported by the first member 61 via the pivot shaft 64b, the front end of the third member 63 and the rear end of the fourth member 64 rotate so as to spread outward to the left and right.

Specifically, the third member 63 on the right side rotates clockwise around the axis of the pivot shaft 63a in a plan view (see FIG. 11(b)). The third member 63 on the left side rotates counterclockwise around the axis of the pivot shaft 63a in a plan view. The fourth member 64 on the right side rotates counterclockwise around the axis of the pivot shaft 64b in a plan view. The fourth member 64 on the left side rotates clockwise around the axis of the pivot shaft 64b in a plan view.

As a result, the third member 63 and the fourth member 64 expand into a diamond shape in a plan view, and the shape of the irradiated portion 60 becomes the second state. As a result, the fifth member 65 is exposed in the area surrounded by the third member 63 and the fourth member 64, and the fifth member 65 becomes able to receive the laser light irradiated from the laser range finder 4. In this way, the area of the irradiated portion 60 of the target member 50 can be expanded in a plan view while inserted into the steel pipe 7, so that the reliability of the irradiation of the laser light from the laser range finder 4 to the irradiated portion 60 can be improved without increasing the size (diameter) of the filling confirmation hole 7e.

As described above, the irradiated portion 60 is
It is formed so that when inserted into the steel pipe 7, its area in a plan view can be expanded.

By configuring it in this way, it is possible to improve the reliability of irradiating the laser light from the laser rangefinder 4 to the irradiated portion 60 without increasing the size of the filling confirmation hole 7e (insertion hole).

REFERENCE SIGNS LIST 1 Measurement unit 4 Laser distance meter 7 Steel pipe 7e, 7g Filling confirmation hole 7f Steam vent hole 8 Concrete 8a Top end 30, 40, 50 Target member 31, 41, 60 Irradiated portion 32 Fixed portion 32a Contact surface 100 Jig for top floor 200 Jig for intermediate floor

Claims (5)

A method for determining the installation accuracy of a jig supporting a measuring unit having a laser range finder that measures the distance from the top of concrete pressed into a steel pipe for a CFT structure to the top edge of the concrete, comprising:
An installation step of installing the jig at a predetermined position;
an insertion step of inserting a target member into the steel pipe through an insertion hole formed below the predetermined position and above the lowest end of the internal space of the steel pipe and penetrating a side surface of the steel pipe, the target member receiving the laser light irradiated from the laser rangefinder;
a first distance measuring step of measuring a first distance, which is a distance in a height direction from the laser range finder to the target member, by the laser range finder;
A second distance measuring step of measuring a second distance, which is a height direction distance from the laser distance meter to the bottom end of the internal space of the steel pipe, by the laser distance meter;
A determination step of determining whether or not the jig is correctly installed by comparing a value obtained by subtracting the first distance from the second distance with a height dimension from the lowermost end of the internal space of the steel pipe to the insertion hole;
An installation accuracy determination method comprising: The insertion hole is
A filling confirmation hole for visually checking whether concrete has been filled to the planned filling height, or a steam vent hole for venting steam in the internal space of the steel pipe.
The installation accuracy determination method according to claim 1 . The target member is
an irradiated portion that is formed to extend in one direction and receives a laser beam irradiated from the laser rangefinder;
A fixed part that fixes the irradiated part to the steel pipe;
Equipped with
The fixed portion is
The contact surface is formed perpendicular to the extension direction of the irradiated portion and is capable of contacting the outer surface of the steel pipe.
The installation accuracy determination method according to claim 1 or 2. The fixed portion is
The magnetic material is used.
The installation accuracy determination method according to claim 3 . The irradiated portion is
When inserted into the steel pipe, the area in a plan view can be expanded.
The installation accuracy determination method according to claim 3 or 4.

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