JP7418822B2 - Building limit confirmation jig - Google Patents

Description

The present invention relates to a construction limit confirmation jig for checking whether a structure is installed within the construction limits of a railway or roadway.

In order to avoid hindrance to the running of vehicles such as trains and automobiles, building limits are defined as dimensional limits that define the spatial range in which structures such as telephone poles, signals, and trees are not allowed to be installed on railways and roads. is stipulated by law.

As the building limits for roadways, for example, as shown in FIG. 13, those prescribed in Figure 1 (1) of Article 12 of the Road Structure Ordinance are known. This diagram shows the building limits for roads that connect to the roadway and have shoulders, tunnels that do not have sidewalks or bicycle paths, or bridges or elevated roads that are 50 meters or more in length. . In addition, H in FIG. 13 has shown the height of the building limit, a and e are the widths of the road shoulders connected to the roadway, and b is a value obtained by subtracting a predetermined value from H.

On the other hand, as a method to confirm the building limits, for structures that are likely to interfere with the building limits, measure the distance from the road surface and the wall of the structure using an aerial work vehicle and a tape measure or laser distance meter. However, a commonly known method is to incorporate this into the drawings and determine the limit failure. In addition, in recent years, the cross section of the measurement area is sometimes scanned using a laser measuring device to confirm the presence or absence of building limit obstructions.

However, all of the above-mentioned methods require a process of confirmation after surveying, and are not easy to use because it is not possible to ascertain at a glance on site whether or not the building limits are being met.

Therefore, a building limit confirmation jig has been proposed that allows building limits to be intuitively determined on-site. As a conventional building limit confirmation jig, for example, as shown in a building limit confirmation jig 10 in FIG. 14, there is one in which a plurality of metal frames are assembled on site.

Road Structure Ordinance, Article 12, Figure 1 (1)

However, conventional building limit confirmation jigs have a large number of parts and require a lot of effort to assemble, and their installation requires equipment such as a unique crane and a lot of manpower.

In addition, conventional building limit confirmation jigs can basically only measure one type of building limit, and when measuring a different type of building limit, it is necessary to separately replace a frame with a different size. Yes, it lacks versatility.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a highly versatile building limit confirmation system that is easy to assemble and install, and can confirm more types of building limits. The goal is to provide jigs.

The construction limit confirmation jig according to the present invention is characterized by comprising a first horizontal beam member, a second horizontal beam member, a longitudinally expandable column member, an elastic belt member, and a base member,
The first horizontal beam member is provided at an upper end portion of the support member, and extends substantially perpendicularly to the longitudinal direction of the support member;
On the lower side of the first horizontal beam member, the second horizontal beam member intersects at a substantially right angle to the longitudinal direction of the support member, and the second horizontal beam member is arranged such that the distance between the second horizontal beam member and the first horizontal beam member can be changed. It is set in
The elastic belt member is provided from one end of the first horizontal beam member to one end of the second horizontal beam member on the same side as the one end of the first horizontal beam member,
The second horizontal beam member is configured to be able to change the length from one end of the second horizontal beam member to the connecting portion of the support column member,
The base member supporting the column member is provided at the lower end portion of the column member.

The building limit confirmation jig according to the present invention has fewer parts than conventional building limit confirmation jigs and has a simple configuration, so it does not require much effort or manpower to assemble, and can be assembled by a small number of workers. can be installed. Further, since the support member is expandable and retractable, the jig itself can be made compact by shortening the support member. Furthermore, in addition to being able to change the height of the jig by adjusting the length of the support member, the length from one end of the second horizontal beam member to the connection part of the support member, and the length of the first horizontal beam member can be changed by adjusting the length of the support member. By changing the distance between the member and the second horizontal beam member, the hypotenuse angle and length of the elastic belt member can be changed. Therefore, it is possible to deal with various building limits, and it is possible to reproduce these building limits so that they can be understood at a glance.

The construction limit confirmation jig according to the present invention preferably includes an attitude maintenance mechanism for maintaining the column member vertically, and an attitude confirmation mechanism for confirming that the column member is vertical. .

According to this configuration, since it is possible to hold the support member in a vertical position and further confirm that the support member is vertical, it is possible to more accurately reproduce the building limits.
be able to.

The building limit confirmation jig according to the present invention preferably includes an angle adjustment mechanism that adjusts the base angle of the base member.

According to this configuration, it is possible to change the base angle of the base member according to the road slope, and it is possible to comply with various construction limits.

In the building limit confirmation jig according to the present invention, the distance from a reference point provided at a predetermined height to the first horizontal beam member, and the distance from the reference point to one end of the second horizontal beam member are determined. It is preferable to include a distance measuring mechanism for measuring the distance.

According to this configuration, it is possible to calculate the accurate height and width of the building limit confirmation jig according to the present invention, and it is possible to confirm whether the building limits can be accurately reproduced.

In the building limit confirmation jig according to the present invention, it is preferable that the distance measuring mechanism is configured to be able to also measure the distance from the reference point to the object.

According to this configuration, since it is possible to derive the "distance dimension" between the building limit confirmation jig (building limit) according to the present invention and the object, for example, a worker can use a ladder etc. to confirm the building limit. There is no need to check the distance between the jig (construction limit) and the object.

FIG. 1 is a schematic configuration diagram when the construction limit confirmation jig according to the present invention is applied to a tunnel. 1 is a schematic configuration diagram of a building limit confirmation jig according to the present invention. It is a top view (a) and a side view (b) of the height limit display plate of a 1st horizontal beam member. They are a cross-sectional view (a) and a vertical cross-sectional view (b) of a connection portion between square pipes of a support member. It is a top view (a) and a side view (b) of the connection member of a 2nd horizontal beam member. It is a top view (a) and a side view (b) of the width limit display plate of a 2nd horizontal beam member. It is a side view of a base member. FIG. 7 is a side view showing how the belt length and hypotenuse angle of the elastic belt member are changed by adjusting the horizontal and/or vertical position of the second horizontal beam member. FIG. 7 is a side view showing how the belt length and hypotenuse angle of the elastic belt member are changed by adjusting the horizontal and/or vertical position of the second horizontal beam member. FIG. 7 is a side view showing how the belt length and hypotenuse angle of the elastic belt member are changed by adjusting the horizontal and/or vertical position of the second horizontal beam member. FIG. 7 is a side view showing how the belt length and hypotenuse angle of the elastic belt member are changed by adjusting the horizontal and/or vertical position of the second horizontal beam member. FIG. 2 is a flowchart showing a method for assembling and installing a building limit confirmation jig according to the present invention. It is a diagram showing the building limits stipulated in Figure 1 (1) of Article 12 of the Road Structure Ordinance. FIG. 2 is a side view showing a conventional construction limit confirmation jig.

[Embodiment]
Embodiments of the building limit confirmation jig according to the present invention will be described with reference to the drawings.
(Building limit confirmation jig)
As shown in FIGS. 1 and 2, the building limit confirmation jig 1 in this embodiment includes a first horizontal beam member 2, a second horizontal beam member 4, a column member 3, an elastic belt member 5, and a base member 6. Be prepared.

The base end portion of the first horizontal beam member 2 is fixed to the distal end portion of the first square pipe 30 of the column member 3, and is supported so as to be substantially perpendicular to the longitudinal direction of the column member 3. Further, a height limit display plate 20 is fixed to the tip of the first horizontal beam member 2 with bolts.

The constituent material of the first horizontal beam member 2 is not particularly limited, but in order to ensure strength and reduce weight, it is preferably composed of a square pipe made of aluminum alloy or the like.

As shown in FIG. 3, the height limit display plate 20 is composed of a horizontally long flat plate member. The upper end surface of the height limit display plate 20 is located at a higher position than the first horizontal beam member 2 and is substantially parallel to the first horizontal beam member 2.

Further, a convex portion 21 is provided on the upper end surface of the outer end portion of the height limit display plate 20 in the lateral direction. The convex portion 21 is configured so that an elastic belt member 5, which will be described later, is hooked thereon. Further, a first laser irradiated portion 22 is provided on the upper end surface of the inner end portion of the height limit display plate 20 in the lateral direction. The first laser irradiated portion 22 is configured to be irradiated with laser light from a laser measurement unit 7, which will be described later, under predetermined conditions.

The constituent material of the height limit display plate 20 is not particularly limited, but if the elastic belt member 5 to be described later is fixed by a magnet, it should be made of steel, such as hot-rolled steel plate (SPHC). is desirable.

The support member 3 in this embodiment includes a first square pipe 30, a second square pipe 31, a third square pipe 32, and a fourth square pipe 33, each having a different outer diameter. becomes larger.

In addition, each of the first square pipe 30, the second square pipe 31, the third square pipe 32, and the fourth square pipe 33 has a plurality of through holes A for inserting L-shaped insertion pins P. They are provided at predetermined intervals along the longitudinal direction.

The strut member 3 in this embodiment is a so-called sliding telescopic strut, and is configured to be extendable and retractable in the longitudinal direction. That is, the third square pipe 32 can be stored in the fourth square pipe 33, the second square pipe 31 can be stored in the third square pipe 32, and the first square pipe 31 can be stored in the second square pipe 31. A square pipe 30 can be accommodated, and the length of the support member 3 can be adjusted by adjusting the amount by which each of the first to third square pipes 30, 31, and 32 are pulled out.

As shown in FIG. 4, at the connecting portion between the square pipes, two insertion pins P are inserted into the through holes A so as to cross each other in a plan view. This fixes the respective positions of the square pipes. Note that although FIG. 4 illustrates the connecting portion between the third square pipe 32 and the fourth square pipe 33, the same applies to the connecting portions between other square pipes. Further, in order to fill the gaps between the square pipes and to prevent the insertion pin P from wobbling, a dry bush may be used in the through hole A.

The constituent material of the strut member 3 is not particularly limited, but is preferably made of aluminum alloy or the like in order to ensure strength and reduce weight.

As shown in FIGS. 2 and 5, the second horizontal beam member 4 is supported below the first horizontal beam member 2 via a connecting member 43 so as to be substantially perpendicular to the longitudinal direction of the column member 3. ing.

As shown in FIG. 5, the second horizontal beam member 4 is provided with a plurality of through holes A for inserting L-shaped insertion pins P at predetermined intervals along the longitudinal direction.

The connecting member 43 is formed of a rectangular tube, and is fixed to the tip of the second pipe 31 of the support member 3 so as to be substantially perpendicular to the longitudinal direction of the support member 3 . The connecting member 43 is also provided with a plurality of through holes A into which L-shaped insertion pins P are inserted.

As shown in FIGS. 8 to 11, the second horizontal beam member 4 is configured so that it can be slid and fixed laterally via a connecting member 43.

When changing the horizontal position of the second horizontal beam member 4, remove the insertion pin P that fixes the second horizontal beam member 4 from the connecting member 43, and then move the second horizontal beam member 4 laterally. Slide it into place. Then, the insertion pin P is again inserted into the through hole A of the connecting member 43 so as to cross the connecting member 43 and the second horizontal beam member 4, and the position of the second horizontal beam member 4 is fixed.

Regarding the distance between the first horizontal beam member 2 and the second horizontal beam member 4, as shown in FIGS. 8 to 11, in the support member 3, the distance between the first square pipe 30 and the second square pipe 31 is It can be freely changed by adjusting the withdrawal amount.

The constituent material of the second horizontal beam member 4 and the connecting member 43 is not particularly limited, but in order to ensure strength and reduce weight, it is preferable that they be composed of square pipes made of aluminum alloy, etc. .

As shown in FIGS. 2 and 6, a width limit display plate 40 is fixed to the tip of the second horizontal beam member 4 with bolts. Further, as shown in FIGS. 2 and 5, a pulley 42 for receiving a tension rope 8, which will be described later, is provided at the rear end portion of the second horizontal beam member 4.

As shown in FIG. 6, the width limit display plate 40 is composed of a vertically long flat plate member. The outer end surface of the width limit display plate 40 is substantially parallel to the support member 3. A second laser irradiated portion 41 is provided on the upper end surface of the outer end portion of the width limit display plate 40 in the lateral direction to be irradiated with a laser beam from a laser measurement unit 7, which will be described later. The second laser irradiated portion 41 in this embodiment is configured to be able to hang an elastic belt member 5, which will be described later.

The constituent material of the width limit display plate 40 is not particularly limited, but if the elastic belt member 5 described below is fixed by a magnet, it may be made of steel, such as hot rolled steel plate (SPHC). desirable.

As shown in FIG. 2, the elastic belt member 5 is provided so as to extend from the height limit display plate 20 of the first horizontal beam member 2 to the width limit display plate 40 of the second horizontal beam member 4.

As shown in FIGS. 3 and 5, the main body 50 of the elastic belt member 5 in this embodiment is fixed to the width limit display plate 40, and the tip portion of the belt 51 is fixed to the height limit display plate 20. ing.

As shown in FIGS. 8 to 11, the elastic belt member 5 has a belt 51 that can be expanded and contracted, and the belt 51 can be expanded or contracted according to the distance between the height limit display plate 20 and the width limit display plate 40. The length of 51 can be changed.

Although the elastic belt member 5 applicable to the present invention is not particularly limited, for example, a magnetic reel-back type nylon belt is desirable. According to the reel-back type nylon belt, the main body 50 is attached to the width limit display plate 40 by magnet attraction, and the tip portion of the belt 51 is attached to the height limit display plate 20 by magnet attraction. can do. Since it is attached using a magnet, the length and angle of the oblique side of the belt 51 can be easily adjusted according to the various shapes of the building limits.

As shown in FIG. 7, a base member 6 that supports the strut member 3 is provided at the lower end portion of the strut member 3. The base member 6 in this embodiment includes a support arm 60, a turnbuckle 61, a fulcrum pin 63, a grounding arm 64, and a laser measurement unit 7.

A lower end portion of the support arm portion 60 is connected to an end portion of the grounding arm portion 64 via a fulcrum pin 63, and the support arm portion 60 and the grounding arm portion 64 can pivot around the fulcrum pin 63. The support arm section 60 and the ground arm section 64 are held at a predetermined angle by a turnbuckle 61 provided across the tip of the support arm and the ground arm section 64.

The angle between the grounding arm section 64 and the support arm section 60 (base angle) can be adjusted by rotating the nut 62 of the turnbuckle 61. Note that a known turnbuckle may be used as the turnbuckle 61.

The support arm portion 60 in this embodiment is composed of a square pipe 30, and the lower end portion of the support member 3 is fitted into the support arm portion 60 of the base member 6, so that the support arm portion 3 is supported by the base member 6. Supported.

At least the support arm section 60 and the ground arm section 64 constituting the base member 6 are desirably made of steel, but are not limited thereto.

The laser measurement unit 7 includes a pedestal member 70, a laser surveying device 71, and a tilt table 72 with a miter gearbox. A pedestal member 70 having an L-shaped cross section is fixed to the side surface of the support arm section 60 at a predetermined distance from the lower end of the support arm section 60. A tilting table 72 is provided on the base member 70, and a laser surveying instrument 71 is installed on the tilting table 72. The laser surveying instrument 71 is attached to a tilting table 72 so that its installation angle can be changed and adjusted.

As shown in FIG. 3, a first ring-shaped member 34 is provided on the side surface of the upper end of the support member 3 opposite to the first horizontal beam member 2 side. As shown in FIG. 7, a second ring-shaped member 65 is provided at the end of the grounding arm portion 64 on the opposite side from the fulcrum pin 63. Note that as the first ring-shaped member 34 and the second ring-shaped member 65, for example, known eye bolts can be used.

As shown in FIGS. 3 and 7, the first ring-shaped member 34 and the second ring-shaped member 65 are configured so that the tension rope 8 can be tied thereto.

(Posture maintenance mechanism)
The building limit confirmation jig 1 of this embodiment is provided with a posture maintenance mechanism for maintaining the support column 3 vertically. The posture maintaining mechanism includes a first ring-shaped member 34, a second ring-shaped member 65, and a tension rope 8.

According to the attitude maintenance mechanism, when the support member 3 is tilted toward the width limit display plate 40 and is bent and is not in a vertical attitude, one end of the support member 3 is tied to the first ring-shaped member 34. By pulling the tension rope 8 to correct the deflection of the strut member 3, and by tying the other end of the tension rope 8 to the second ring-shaped member 65, the strut member 3 can be maintained in a vertical position.

(Attitude confirmation mechanism)
The building limit confirmation jig 1 of this embodiment is provided with an attitude confirmation mechanism for confirming that the support member 3 is vertical. The posture confirmation mechanism includes a laser measurement unit 7 and a first laser irradiated portion 22 of the height limit display plate 20.

When the support member 3 is in the vertical position, the first laser irradiated portion 22 of the height limit display plate 20 is configured to be located directly above the laser surveying instrument 71 in the laser measurement unit 7.

Therefore, when checking whether the support member 3 is perpendicular to the ground, for example, a laser is emitted vertically upward from the laser surveying device 71 of the laser measurement unit 7, and the laser is used to display the height limit. If it hits the first laser irradiated portion 22 of the plate 20, it can be confirmed that the support member 3 is vertical.

(Angle adjustment mechanism)
The construction limit confirmation jig 1 of this embodiment is provided with an angle adjustment mechanism for adjusting the base angle of the base member 6. The angle adjustment mechanism includes a support arm section 60, a turnbuckle 61, a fulcrum pin 63, and a ground arm section 64.

As described above, the angle between the grounding arm section 64 and the support arm section 60 (base angle) can be adjusted by rotating the nut 62 of the turnbuckle 61. Therefore, it is possible to change the base angle according to the road slope, and it is possible to comply with various construction limits. That is, depending on the construction limit, the height may be measured "perpendicular to the ground" or "perpendicular to the road slope", and the base angle of the base member 6 can be adjusted. By doing so, it is possible to deal with any of these cases.

(Distance measurement mechanism)
The building limit confirmation jig 1 of this embodiment includes distance measurement that measures the distance from the reference point on the support member 3 to the first horizontal beam member 2, and the distance from the reference point to one end of the second horizontal beam member. A mechanism is provided. The distance measuring mechanism includes a laser measurement unit 7, a first laser irradiated portion 22 of the height limit display plate 20, and a second laser irradiated portion 41 of the width limit display plate 40.

As shown in FIG. 2, in the distance measuring mechanism, the laser measuring device 71 of the laser measuring unit 7 is used as a reference point, and the laser measuring device 71 irradiates the first laser irradiated portion 22 of the height limit display plate 20 with a laser beam. and measure the straight line distance h. Further, a laser beam is irradiated from the laser surveying device 71 to the second laser irradiated portion 41 of the width limit display plate 40, and the straight line distance L thereof is measured.

Here, by setting the installation height of the laser surveying device 71 to h1 and setting the inclination angle of the laser surveying device 71 to θ, the height H1 and the width of the upper end surface of the height limit display plate 20 are calculated using the following calculation formula. The height H2 to the upper end surface of the limit display plate 40 and the distance W from the straight line extending from the laser surveying device 71 to the first laser irradiated portion 22 to the outer end surface of the width limit display plate 40 can be calculated.
H1=h+h1
H2=h1+(L×cosθ)
W=L×sinθ

In addition, according to the distance measuring mechanism in this embodiment, the laser surveying device 71 of the laser measuring unit 7 is used as a reference point, and the straight distance from the laser surveying device 71 to the object (for example, tunnel T, etc.) and the laser surveying device 71 are measured. The horizontal/vertical distance from the laser surveying instrument 71 (reference point) to the target object can be calculated by measuring the inclination angle and performing calculations using trigonometric functions. As a result, it is possible to derive the "distance dimension" between the building limit confirmation jig 1 (building limit AL) according to the present embodiment and the target object, so that, for example, a worker can climb up a ladder or the like and check the building limit confirmation jig 1 (building limit AL). There is no need to check the distance between the confirmation jig 1 (construction limit AL) and the object.

(Method of assembly and installation)
Next, a method of assembling and installing the building limit confirmation jig 1 according to this embodiment will be explained based on FIG. 12.

First, as shown in #01, by rotating the nut 62 of the turnbuckle 61 in the base member 6, the base angle is adjusted to the slope angle of the roadway R to be installed. At this time, use a level or the like to confirm that the mounting surface of the pedestal member 70 is horizontal. A tilt table 72 and a laser surveying instrument 71, which will be described later, are attached to the attachment surface.

As shown in #02, the vertical distance between the upper end surface of the height limit display plate 20 and the upper end surface of the width limit display plate 40 is set so that it corresponds to the length b of the building limit AL (see FIG. 13). After adjusting the amount of the first square pipe 30 pulled out from the second square pipe 31, the two insertion pins P are inserted into the through hole A to connect the first horizontal beam member 2 and the second horizontal beam member 4. fix the distance.

As shown in #03, the horizontal distance between the outer end surface of the height limit display plate 20 and the outer end surface of the width limit display plate 40 is made to correspond to the length a of the building limit (see FIG. 13). After adjusting the length of the second horizontal beam member 4 on the width limit display plate 40 side by sliding the second horizontal beam member 4 in the lateral direction, insert the insertion pin P into the through hole A. The lateral position of the second horizontal beam member 4 is fixed.

As shown in #04, the elastic belt member 5 is attached so as to extend from the height limit display plate 20 of the first horizontal beam member 2 to the width limit display plate 40 of the second horizontal beam member 4. In this embodiment, a magnetic reel-back type nylon belt is used as the elastic belt member 5. In addition, in order to prevent interference with the laser irradiated from the laser surveying device 71, the main body 50 of the reel-back type nylon belt is attached with a magnet to the back side of the width limit display plate 40 (the side where the second horizontal beam member 4 is attached). Let it absorb. Further, the tip end portion of the belt 51 of the reel-back type nylon belt is also attracted to the back side of the height limit display plate 20 (the side to which the first horizontal beam member 2 is attached) using a magnet.

At this time, as shown in FIGS. 3(b) and 6(b), the convex portion 21 of the height limit display plate 20 and the second laser irradiated portion 41 of the width limit display plate 40 have The belt 51 of the elastic belt member 5 is hooked.

As shown in #05, the building limit confirmation jig 1 is installed at a predetermined starting location in accordance with the building limit AL to be confirmed. At this time, according to the construction limit confirmation jig 1 according to the present embodiment, it can be installed by a small number of workers.

As shown in #06, the length of the support member 3 is adjusted so that the height of the upper end surface of the height limit display plate 20 corresponds to the height of H of the building limit AL (see FIG. 13), The length of the support member 3 is fixed by inserting the insertion pin P into the through hole A.

As shown in #07, the tilting table 72 and laser surveying instrument 71 of the laser measurement unit 7 are mounted on the pedestal member 70. Note that the pedestal member 70 is attached to the support arm portion 60 of the base member 6 at a predetermined height.

As shown in #08, the inclination angle of the laser surveying device 71 of the laser measurement unit 7 is set to 90 degrees, and the laser surveying device 71 is activated. At this time, the pillar member 3 is tilted toward the width limit display plate 40, for example, and is bent and is not in a vertical posture, and the laser beam hits the first laser irradiated portion 22 of the height limit display plate 20. If not, by pulling the tension rope 8 whose one end is tied to the first ring-shaped member 34 (see FIG. 3), the laser beam can be applied to the first laser irradiated part 22 of the height limit display plate 20. to correct the deflection of the support member 3. Then, by tying the other end of the tension rope 8 to the second ring-shaped member 65 (see FIG. 7), the strut member 3 is held in a vertical position.

As described above, by assembling and installing the building limit confirmation jig 1 according to the present invention, for example, as shown in FIG. 1, when the building limit confirmation jig 1 is used on a road R in a tunnel T, It is possible to check at a glance whether the structure of Tunnel T complies with the building limits.

The building limit confirmation jig 1 according to the present invention has fewer parts than the conventional building limit confirmation jig 10 (see FIG. 14) and has a simple configuration, so it does not require much effort or manpower to assemble. It can be installed by a small number of workers. Moreover, since the support member 3 is expandable and retractable, the jig itself can be made compact by shortening it. Furthermore, in addition to being able to change the height of the jig by adjusting the length of the support member 1, the support member 3 can be connected from one end of the second horizontal beam member 4 (width limit display plate 40). By changing the length up to the section 43 and the distance between the first horizontal beam member 2 and the second horizontal beam member 4, the oblique side angle and length of the elastic belt member 5 can be changed as shown in FIGS. 8 to 11. can be changed. Therefore, it is possible to deal with various building limits AL, and it is possible to reproduce these building limits AL so that they can be understood at a glance.

(Other embodiments)
1. The second horizontal beam member is not limited to the configuration in which it is slid in the horizontal direction as described in the above embodiment, and the second horizontal beam member is connected to the support member from at least one end (width limit display plate) of the second horizontal beam member. It is sufficient that the length up to the connecting portion (connecting member) of the connecting member can be changed.
2. The second horizontal beam member is not limited to the above-described configuration in which it is fixed to the second square pipe of the support member, but may be configured so that it can be moved and fixed over the entire longitudinal direction of the support member. Also good.

The building limit confirmation jig according to the present invention can be particularly suitably used in the technical field for confirming building limits on railways and roadways.

1 Building limit confirmation jig 10 Conventional building limit confirmation jig 2 First horizontal beam member 20 Height limit display plate 21 Convex portion 22 First laser irradiated area 3 Support member 30 First square pipe 31 Second square pipe 32 Third square pipe 33 Fourth square pipe 34 First ring-shaped member 4 Second horizontal beam member 40 Width limit display plate 41 Second laser irradiated part 42 Pulley 43 Connection member (connection part)
5 Elastic belt member 50 Main body 51 Belt 6 Base member 60 Support arm portion 61 Turnbuckle 62 Nut 63 Fulcrum pin 64 Ground arm portion 65 Second ring-shaped member 7 Laser measuring unit 70 Pedestal member 71 Laser surveying instrument 72 Inclined table 8 Tension rope P Insertion pin A Through hole T Tunnel R Roadway AL Construction limit

Claims (5)

A first horizontal beam member, a second horizontal beam member, a longitudinally expandable support member, an elastic belt member, and a base member,
The first horizontal beam member is provided at an upper end portion of the support member, and extends substantially perpendicularly to the longitudinal direction of the support member;
On the lower side of the first horizontal beam member, the second horizontal beam member intersects at a substantially right angle to the longitudinal direction of the support member, and the second horizontal beam member is arranged such that the distance between the second horizontal beam member and the first horizontal beam member can be changed. It is set in
The elastic belt member is provided from one end of the first horizontal beam member to one end of the second horizontal beam member on the same side as the one end of the first horizontal beam member,
The second horizontal beam member is configured to be able to change the length from one end of the second horizontal beam member to the connecting portion of the support column member,
A building limit confirmation jig, wherein the base member supporting the support member is provided at a lower end portion of the support member. The building limit confirmation jig according to claim 1, comprising an attitude maintenance mechanism for maintaining the column member vertically, and an attitude confirmation mechanism for confirming that the column member is vertical. The building limit confirmation jig according to claim 1 or 2, further comprising an angle adjustment mechanism that adjusts the base angle of the base member. Claims 1 to 3 further comprising a distance measuring mechanism that measures a distance from a reference point provided at a predetermined height to the first horizontal beam member, and a distance from the reference point to one end of the second horizontal beam member. Building limit confirmation jig as described in any one of the above. 5. The building limit confirmation jig according to claim 4, wherein the distance measuring mechanism is configured to be able to also measure the distance from the reference point to the object.

Images