JP2016121450A - Measuring jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring jig which: is used for measuring bolt installation positions in construction work to fix a member to a plurality of bolts protruded from a wall surface; and can improve work efficiency by shortening a construction period.SOLUTION: In a repair method of a bridge 100 which has a bridge pier or a bridge abutment made of concrete, a bridge girder is supported by a steel support member 200 installed on the bridge pier or the bridge abutment through a plurality of anchor bolts 150 fixed thereto. The repair method enables positions of the anchor bolts 150 to be accurately measured in a short period of time by measuring the positions of measurement jigs 10 attached to tips of the anchor bolts 150. Also, because the measurement jigs 10 are vertically attached to the anchor bolts 150, the repair method enables axial directions of the anchor bolts 150 to be measured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a jig used to measure the position of a screw portion protruding from a wall surface, and more specifically, the anchor bolt tip position and bolt shaft protruding from a bridge pier used when attaching a member to a substructure for repairing or reinforcing a bridge. The present invention relates to a measuring jig used for measuring a direction.

  In recent years, awareness of the importance of infrastructure is increasing due to the occurrence of the earthquake disaster, and the need to inspect and repair civil engineering structures is increasing. In particular, methods for repairing or reinforcing bridges are being sought in equipment maintenance required due to aging. The bridge is composed of an upper structure and a lower structure, and the upper structure is supported on the lower structure by a member called a support installed therebetween. For this reason, when repairing or reinforcing a support, it is necessary to temporarily support the upper structure using a steel support member or the like supported by anchor bolts installed on the pier.

  Patent Document 1 discloses a technique related to a method for repairing an existing bridge support device. This is a method for repairing an existing bridge support device that supports the upper structure via a steel support. The horizontal force support function is eliminated by removing the protrusion of the steel support, and the support for the vertical force is used. To. And as a new horizontal force support bearing, there is a certain gap on the side of the steel box frame that is the upper structure, and a reaction force wall is built in the lower structure, and the side of the reaction force wall and the steel box A cushioning material in which mounting plates are arranged on both side surfaces of the elastic body is arranged vertically in a gap formed between the frame and one mounting plate is fixed to the side surface of the reaction force wall, and the other Fix the mounting plate to the steel box frame. By such a procedure, it is possible to provide a construction method capable of repairing an existing bridge support device without jacking up the superstructure.

JP 2000-8323 A

  However, when repairing a bridge using the technique described in Patent Document 1, a space where a new horizontal force support bearing can be arranged is required. Moreover, since the structure uses the existing bearing, it is difficult to use it for the purpose of exchanging the bearing itself. As described above, in recent years, as a part of the reinforcement work for aging bridges, there are an increasing number of cases in which bridge supports are exchanged, and it is necessary to cope with this.

  When exchanging the bearing, as described above, when removing the bearing, the steel support member is attached to the pier, and the bearing is removed while receiving the girder on the upper surface of the steel support member. However, it is desirable that the anchor bolts used for attaching the steel support members be installed avoiding the reinforcement of the pier from the viewpoint of construction efficiency and maintaining the strength of the pier. For this reason, it is necessary to install the anchor bolt while avoiding the reinforcement of the pier at the site, and to make a hole corresponding to the position of the anchor bolt in the steel support member. For this reason, it takes time to design the steel support member after the operator measures the position of the anchor bolt, and the construction period is long. In addition, since the measurement was performed by the worker, the measurement accuracy was affected by the skill of the worker.

  In addition, the anchor bolt that protrudes from the pier may be inclined, and the anchor bolt cannot be inserted into the steel support member simply by measuring the tip position of the protruding anchor bolt and manufacturing the steel support member. Cases may occur. Therefore, when manufacturing the steel support member, it is necessary to measure the anchor bolt position on the front surface of the pier in consideration of the inclination of the anchor bolt, and to manufacture the steel support member including both.

  Accordingly, an object of the present invention is to provide a measuring jig that can efficiently measure the position of an anchor bolt protruding from a bridge pier when repairing or reinforcing a bridge, and contributes to shortening the construction period and improving measurement accuracy. To do.

  In order to achieve the above object, a measuring jig according to an aspect of the present invention has the following characteristics.

(1) In a measurement jig used for investigating the position and inclination of anchor bolts provided on the pier or the abutment when repairing and reinforcing a bridge having a pier or abutment using concrete, A female screw part for attaching to a tip of an anchor bolt provided on the abutment or the abutment used, an orthogonal plane orthogonal to the axis of the anchor bolt, and a marker plate having a center detection mark, The marker plate is installed on the orthogonal plane.

  According to the aspect described in (1) above, it is possible to attach a measurement jig to the tip of the anchor bolt, measure the position of the hole provided in the steel support member, and facilitate the manufacture of the steel support member. . As a result, the construction period for repairing the bridge can be shortened. This is because anchor bolts are placed on the piers or abutments used for the bridge, and a jig for measurement is attached to the tip of the anchor bolt and the position is photographed. This is because it is possible to acquire the position of the tip of the bolt, so that the working time can be greatly reduced as compared with the case where the worker has manually measured the tip of the anchor bolt so far.

  The measuring jig is attached to the tip of the anchor bolt and is photographed using photographing means such as a camera. By processing the image obtained as a result, the relative position of the anchor bolt can be determined. This is because a center position detection mark capable of detecting the center position is provided at the tip of the measuring jig. The center position detection mark indicates not only the center of the measurement jig but also the position of the tip of the anchor bolt to which the measurement jig is attached, so that the position of the insertion hole provided in the steel support member can be specified. Is possible. Moreover, the inclination of an anchor bolt can be obtained because the marker plate is installed in the orthogonal plane. This is because the inclination can be determined by detecting the deformation of the shape of the center position detection mark.

  Therefore, it is possible to obtain an appropriate anchor bolt position. The position of the anchor bolt is necessary for the design of the steel support member as shown in the problem, and using this measuring jig contributes to shortening the design and manufacturing period of the steel support member. The construction period required for repair and reinforcement can be shortened.

(2) In the measurement jig according to (1), it is preferable that the marker plate is provided with an identification mark. This includes identification marks that can be individually identified, thereby enabling individual identification of each measurement jig. Therefore, when photographing by the photographing means, it is possible to join images even if all the measuring jigs do not fit within one frame. That is, the overall relative position of the anchor bolt can be confirmed.

  Moreover, in order to achieve the said objective, the bridge repair method by 1 aspect of this invention has the following characteristics.

(3) In repairing a bridge having a pier or abutment using concrete, a plurality of anchor bolts are installed on the pier or the abutment, a steel support member is attached using the anchor bolt, and the steel support member In the bridge repair method performed by supporting the bridge girder, a measuring jig having a female screw part and a marker plate is attached to the tip of the anchor bolt, and the surface of the bridge pier or the abutment is photographed using a photographing means. Photographed so that a plurality of the measuring jigs are photographed, measured the position of the anchor bolt using the photographed digital data, the steel support member attached to the pier or the abutment, the position of the anchor bolt Reflectingly, a through hole through which the anchor bolt passes is provided.

  Moreover, in order to achieve the said objective, the reinforcement method of the bridge by another aspect of this invention has the following characteristics.

(4) A method of reinforcing a bridge in which a plurality of anchor bolts are installed on a pier or abutment using concrete provided for a bridge, a steel support member is attached using the anchor bolt, and a bridge girder is supported by the steel support member. In this case, a measuring jig having a female screw part and a marker plate is attached to the tip of the anchor bolt, and the surface of the abutment or the abutment is photographed using a photographing means so that a plurality of the measuring jigs are photographed. Then, using the photographed digital data, the position of the anchor bolt is measured, and a steel support member attached to the pier or the abutment reflects the position of the anchor bolt to pass through the anchor bolt. It is characterized by providing.

  In order to achieve the above object, a method for manufacturing a steel support member according to another aspect of the present invention has the following characteristics.

(5) In repairing or reinforcing a bridge having a pier or abutment using concrete, a plurality of anchor bolts are installed on the pier or the abutment, and the bridge girder is supported by attaching using the anchor bolts. In the manufacturing method of the support member, a measuring jig having a female screw part and a marker plate is attached to the tip of the anchor bolt, and the measuring jig is attached to the surface of the abutment or the abutment using a photographing means. A plurality of photographs are taken, and the position of the anchor bolt is measured using the photographed digital data, and the position of the anchor bolt is reflected on the steel support member attached to the pier or the abutment. It is characterized by providing a through-hole through which.

It is a perspective view of the jig for measurement of a 1st embodiment. It is sectional drawing of the jig | tool for measurement of 1st Embodiment. It is a perspective view which shows the structure of a bridge of 1st Embodiment. It is a perspective view of a mode that an anchor bolt was embedded in a beam part of a 1st embodiment. It is a perspective view of a mode that a jig for measurement is arranged on an anchor bolt of a 1st embodiment. It is a model side view regarding anchor position shift amount correction of a 1st embodiment. The perspective view of the steel support member of 1st Embodiment is shown. It is a perspective view of the jig for measurement of a 2nd embodiment. It is a perspective view of a mode that the jig for measurement was arranged on the anchor bolt of a 2nd embodiment.

  First, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a measurement jig 10 according to the first embodiment. FIG. 2 shows a cross-sectional view of the measurement jig 10. The measurement jig 10 includes a main body 11 and a marker plate 15. The main body 11 is a cylindrical body made of aluminum, and a center line 11e is provided on the surface 11a in a cross shape by scribing. An internal thread portion 11c of M36 is provided on the inner surface of the main body portion 11 from the back surface 11b side. As shown in FIG. 2, the female screw portion 11 c is provided halfway along the main body portion 11, and has a blind hole structure in which a stepped portion 11 d that protrudes inward is formed.

  The marker plate 15 is a black plate formed in a square shape, and a white frame 16 is drawn on a black background 15a on the surface thereof. Position markers 16 a provided at one corner of the white frame 16 and identification markers 17 provided in the white frame 16 are provided. The identification marker 17 is formed by arranging a plurality of identification patterns 17a painted in a plurality of white squares on a plane, and enables the marker plate 15 to be identified based on the relative position to the position marker 16a. As shown in FIG. 2, a reference line 15b is provided at the center of each of the four sides around the marker plate 15, and the surface 11a of the main body 11 is aligned with the reference line 15b and the center line 11e. By attaching the identification marker 17 to the measurement jig 10, the measurement jig 10 is formed. At this time, the center of the white frame 16 becomes the center of the marker plate 15. That is, the white frame 16 also has a center position detection function.

  FIG. 3 is a perspective view showing the structure of the bridge 100. The bridge 100 is used for a railway bridge, and in FIG. 3, tracks and floor slabs are omitted. In addition, a cut model is shown for convenience of explanation. A bridge 100 shown in FIG. 3 includes a beam portion 111 provided in a column portion 110 of a pier, a main girder 121 disposed on the beam portion 111, a horizontal girder 122 connecting the main girders 121, a main girder 121 and a beam portion. The structure is provided with a support 125 that is disposed between 111 and fixed to each other. Note that the structure shown in FIG. 3 is an example of a configuration adopted for the bridge 100, and thus does not prevent the invention from being applied to other configurations.

  In performing the earthquake-proofing work and the reinforcement work for the bridge 100, the work for exchanging the support 125 is performed in the following procedure. The procedure will be briefly described.

  FIG. 4 is a perspective view showing how the anchor bolt 150 is installed in the beam portion 111. The anchor bolt 150 is held by the beam portion 111 so that the male screw portion 150 a protrudes from the surface of the beam portion 111. The beam portion 111 is made of reinforced concrete, and the reinforcing bars are arranged vertically and horizontally inside. For this reason, arrangement | positioning of the anchor bolt 150 becomes arrangement | positioning avoiding a reinforcing bar. Holes are provided in the concrete, anchor bolts 150 are installed, and fixed using a curable resin or the like. This is shown in the state of FIG.

  Thereafter, in order to measure the position of the anchor bolt 150, the measuring jig 10 is attached to the tip of the anchor bolt 150. The measurement jig 10 can be arranged by screwing the female screw portion 11 c of the measurement jig 10 and the male screw portion 150 a of the anchor bolt 150. Since the measuring jig 10 has a stepped hole 11d as shown in FIG. 2 and has a blind hole structure, if the measuring jig 10 is screwed to a predetermined position, it can be screwed further. I can't.

  FIG. 5 is a perspective view showing a state where the measurement jig 10 is arranged and photographed. FIG. 5 shows a state in which the measurement jig 10 is arranged. In addition to the measurement jig 10, a plurality of marker plates 15 are arranged. A scale 50 provided with a marker plate 15 is disposed. In this state, the digital data is acquired by photographing the surface of the beam portion 111 with a digital camera corresponding to the photographing means so that a plurality of the measuring jigs 10 are captured. After acquiring the digital data, the digital data is analyzed to calculate a three-dimensional coordinate value, and the position of the anchor bolt 150 is acquired from the three-dimensional coordinate value.

  Imaging with a digital camera needs to be performed with a resolution that allows the identification marker 17 of the marker plate 15 to be identified. This is because the marker plate 15 provided at the tip of the anchor bolt 150 is used for individual identification of the measurement jig 10. On the other hand, since the anchor bolt 150 is installed over a wide range on the side surface of the beam portion 111, it is difficult to take a picture so that all the anchor bolts 150 are captured with a resolution that allows the identification marker 17 of the marker plate 15 to be identified. is there. For this reason, the range in which the anchor bolt 150 is installed is divided into several areas, and shooting is performed so that the areas overlap.

  Then, after photographing the beam portion 111 to obtain digital data, a coupling process is performed by software to obtain coupled data. When the data are combined, the measurement jig 10 is identified by the identification marker 17 and is photographed so that the areas where the photographing is divided overlap, so that seamless data can be obtained. This is because the same identification marker 17 may be combined so as to overlap. The coupling data thus obtained is analyzed, and the position of the anchor bolt 150 is calculated.

  FIG. 6 shows a schematic side view relating to the shift amount correction. In FIG. 6, the anchor bolt 150 is installed obliquely with respect to the surface of the beam portion 111. In order to make it easy to understand, the slope is enlarged, but the root center C1 of the root portion of the anchor bolt 150 and the virtual center C2 when the center of the marker plate 15 is projected onto the beam portion 111 are offset by C. Only the position will change. Such a situation can be assumed as long as the marker plate 15 indicates the center position of the measuring jig 10 attached to the tip of the anchor bolt 150. In particular, this situation may occur in the field depending on the skill of the worker.

  Since the steel support member 200 described later is fixed in contact with the surface of the beam portion 111, the position of the root center C1 is a problem. Therefore, when analyzing the coupling data and calculating the position of the anchor bolt 150, the normal vector direction of the marker plate 15 is compared with the plane that can be grasped by the marker plate 15 provided on the surface of the beam portion 111, The root center C1 is detected. Thus, the position of the anchor bolt 150 can be obtained accurately. In addition, since processing using software such as a coupling and analysis method uses an existing technique such as a digital camera three-dimensional measurement system, description thereof is omitted.

  FIG. 7 shows a perspective view of the steel support member 200. The steel support member 200 is formed by welding a rib 201 or the like to a base plate 202. A top plate 203 that supports the main beam 121 is also provided. Such a steel support member 200 is formed by providing through holes 205 in the base plate 202 and welding the ribs 201 and the top plate 203 based on data obtained by measuring the position of the anchor bolt 150. The steel support member 200 is manufactured at the factory and then transported to the site. The steel support member 200 is disposed on the side surface of the beam portion 111 so that the anchor bolt 150 penetrates the through hole 205, and the nut 160 Conclude with. Thus, the steel support member 200 is installed on the beam portion 111.

  The steel support member 200 is adjusted so that the main girder 121 can be supported by the top plate 203 after being fixed to the beam portion 111. In this way, the main girder 121 is supported by the steel support member 200. That is, the main girder 121 is fixed to the beam portion 111 by the steel support member 200. In this state, the support 125 of the bridge 100 can be exchanged. In this way, the bridge 100 can be repaired.

  When reinforcing the bridge 100, the main girder 121 is fixed to the beam portion 111 by the steel support member 200. Thereafter, whether or not the support 125 is replaced, the steel support member 200 can be used as a reinforcing member by keeping the steel support member 200 fixed as a part of the bridge 100. In addition, it is possible to make it the state which can exhibit the function of the support 125 by providing a sliding surface between the steel support members 200 and the main beam 121. By using the steel support member 200 to reinforce the bridge 100 as described above, the load applied to the bridge 100 can be dispersedly supported.

  Since the measurement jig used for repairing or reinforcing the bridge of the first embodiment has the above-described configuration, the following operations and effects are achieved.

  First, it is possible to improve the efficiency of repair or reinforcement of a bridge by repairing or reinforcing the bridge using a measurement jig used for repairing or reinforcing the bridge of the first embodiment. This is a female screw for attaching to the tip of an anchor bolt 150 provided on a bridge pier used for the bridge 100 or an abutment in the measuring jig 10 used for repair or reinforcement of the bridge 100 when repairing or reinforcing the bridge 100. This is realized by using a measurement jig 10 including a portion 11c and a marker plate 15 having a position marker 16a corresponding to a center detection mark.

  When repairing the bridge 100 having concrete piers or abutments, a plurality of anchor bolts 150 are installed on the piers or abutments, and the steel support members 200 are attached using the anchor bolts 150. In the repair method of the bridge 100 performed by supporting the bridge girder, the bridge 100 is repaired or reinforced using such a measuring jig 10. That is, the measuring jig 10 having the female screw portion 11c and the marker plate 15 is attached to the tip of the anchor bolt 150, and the surface of the pier or the abutment is photographed so that a plurality of measuring jigs 10 are photographed. The position of the anchor bolt 150 is measured using the digital data photographed by using the through hole 205 through which the anchor bolt 150 passes through the steel support member 200 attached to the pier or the abutment, reflecting the position of the anchor bolt 150. Is provided.

  The bridge 100 is held by the steel support member 200 as described above, so that the support 125 can be replaced. And since the manufacturing time of the steel support member 200 can be shortened and the reworking of the steel support member 200 at the site can be reduced, the overall process can be shortened. This is because the anchor bolt 150 is installed on the beam portion 111 of the bridge 100 and the steel support member 200 must be manufactured in accordance with this. The position of the anchor bolt 150 installed on the beam portion 111 is measured. This is because it can be acquired in a short time by using the jig 10.

  As described above, the anchor bolt 150 is installed avoiding the position of the reinforcing bar arranged inside the beam portion 111, and a hole for manually installing the anchor bolt 150 is formed and the anchor bolt 150 is installed. After that, there is a problem that the angle slightly changes at the stage of fixing with resin. That is, there are many cases where the anchor bolt 150 cannot be arranged as designed. Therefore, it is necessary to adjust the through hole 205 vacated in the base plate 202 of the steel support member 200 according to the position of the anchor bolt 150 provided in the beam portion 111. In addition, when the position of the anchor bolt 150 is measured manually, the accuracy of the measurement result depends on the skill of the worker.

  On the other hand, due to such circumstances, it is difficult to previously provide the through hole 205 at an appropriate position in the base plate 202 of the steel support member 200. Further, the position of the rib 201 may interfere depending on the position of the anchor bolt 150. For this reason, after measuring the position of the anchor bolt 150, it must be reflected in the design of the steel support member 200. Manufacturing the steel support member 200 in accordance with the position of the anchor bolt 150 is a factor that lengthens the work period necessary for repairing the bridge 100.

  However, the position of the anchor bolt 150 can be accurately measured in a short time by placing the measuring jig 10 at the tip of the anchor bolt 150 and capturing the position of the anchor bolt 150 by photographing with a digital camera. . Based on this data, a through hole 205 is provided in the base plate 202 of the steel support member 200. By doing so, the positional deviation between the anchor bolt 150 and the through hole 205 can be suppressed. As a result, when the steel support member 200 is attached to the beam portion 111, it is possible to eliminate the need for correction work of the steel support member 200 in the field, and it is possible to shorten the construction period for repairing the bridge 100. Become.

  Further, the through hole 205 has a hole of about φ39 with respect to the anchor bolt 150 of M36, for example. This is because the aim is to evenly distribute the load of the steel support member 200. However, the positional accuracy of the through hole 205 is therefore required. For this reason, it is necessary to accurately determine the position of the anchor bolt 150. This is due to the following reason. For example, when an enlarged hole of φ41 is made as the through hole 205 with respect to the anchor bolt 150 of M36, alignment of the through hole 205 is facilitated, and the positional accuracy of the anchor bolt 150 is allowed to be somewhat low. However, in that case, the load dispersion effect of the steel support member 200 is reduced, and a case where an excessive load is concentrated on some anchor bolts 150 is assumed.

  In some cases, an impact load is expected to be applied to the steel support member 200 provided on the bridge 100. If the load is concentrated on a specific anchor bolt 150, the anchor bolt 150 may be broken. And when some anchor bolts 150 are damaged, there exists a possibility that the performance of the steel support members 200 cannot be exhibited. In order to avoid such a situation, it is desirable that the through hole 205 is designed to be as small as possible with respect to the diameter of the anchor bolt 150. And according to the repair method of the bridge 100 of 1st Embodiment, since the position of the through-hole 205 becomes settled correctly, it can anticipate further improving the dispersion effect of the load which the steel support members 200 receive. In addition, the labor for measuring the position of the anchor bolt 150 is reduced, and the labor for repairing the steel support member 200 in the field is also reduced.

  Further, the marker plate 15 is provided with a position marker 16a corresponding to a center detection mark for detecting the center thereof, and an identification marker 17 corresponding to an identification mark that can be distinguished from each other, whereby the position marker 16a. And the number of marker plates 15 to be arranged can be reduced as compared with the case where the identification markers 17 are separately provided.

  Next, a second embodiment of the present invention will be described. The measurement jig 20 used for the repair or reinforcement of the bridge according to the second embodiment is substantially the same as the configuration of the measurement jig 10 used for the repair or reinforcement of the bridge according to the first embodiment. Will be described below.

  FIG. 8 is a perspective view of the measurement jig 20 of the second embodiment. FIG. 9 is a perspective view showing a state where the measurement jig 20 is arranged and photographed. The measuring jig 20 has a configuration in which a marker plate 22 is provided on a hexagonal nut 21 of M36. The marker plate 22 is provided with a center detection mark 23 at a circular center position so that the center position of the anchor bolt 150 can be determined in a state where the measuring jig 20 is screwed to the anchor bolt 150. The measuring jig 20 is screwed into an anchor bolt 150 installed on the side surface of the beam portion 111 shown in FIG. An identification marker 25 is arranged between the anchor bolts 150. In the identification marker 25, a plurality of white circles are arranged on a black plate, and an individual can be identified by an arrangement pattern of white circles.

  Further, the scale 50 is arranged as in the first embodiment, and the position detection mark 27 is arranged on the scale 50. The position detection mark 27 is basically formed according to the same rule as the identification marker 25. FIG. 9 shows this state, and by taking a picture in this state, the position of the anchor bolt 150 can be measured as in the first embodiment. In this way, similar to the first embodiment, the method for repairing the bridge 100 according to the second embodiment also facilitates preparation for manufacturing the steel support member 200 and contributes to shortening the work period required for repairing the bridge 100. be able to.

  Note that the difference between the first embodiment and the second embodiment is the difference between the measurement jig 10 and the measurement jig 20, but since the shape of the measurement jig 20 is simple, the manufacture is easy. There are advantages such as a certain point and the fact that the center detection mark 23 of the measuring jig 20 has a simple shape and is resistant to dirt on the spot. In addition, since the center detection mark 23 and the marker plate 22 can be made a large pattern, an effect of using a digital camera with low resolution or reducing the number of shots can be expected. On the other hand, since there is a tendency to require more identification markers 25 than in the case of the first embodiment, there is a demerit that the preparation effort before photographing increases. For this reason, it should be appropriately selected according to the site.

  As described above, the embodiment of the bridge repair method and the bridge repair jig according to the present invention has been described, but the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. Is possible. For example, the pattern of the marker plate 15 and the identification marker 25 is not limited to the illustrated form, but can be applied as long as it is a form that allows individual identification. Moreover, it does not prevent changing the shape and structure of the main body 11 and the hexagon nut 21.

  Further, the measuring jig 10 and the measuring jig 20 are provided with a female thread portion of M36, but it is only necessary to be able to engage with the anchor bolt 150. For example, different screw dimensions and different standards are used. It does not prevent you from taking things to use. In addition, the materials of the measurement jig 10 and the measurement jig 20 do not prevent the use of materials other than aluminum, such as steel or resin.

DESCRIPTION OF SYMBOLS 10 Measurement jig | tool 11 Main-body part 11c Female thread part 11d Step part 15 Marker plate 16 White frame 16a Position marker 17 Identification marker 50 Scale 100 Bridge 110 Column part 111 Beam part 121 Main girder 122 Cross girder 125 Bearing 150 Anchor bolt 150a Male thread 160 Nut 200 Steel support member

Claims (2)

When repairing and reinforcing a bridge having a pier or abutment using concrete, the measuring jig used for investigating the position and inclination of the anchor bolt provided on the pier or the abutment,
A female screw portion for attaching to the tip of an anchor bolt provided on the pier or the abutment used for the bridge;
An orthogonal plane orthogonal to the axis of the anchor bolt;
A marker plate having a center detection mark,
The marker plate is installed on the orthogonal plane;
A measuring jig characterized by The measurement jig according to claim 1,
Providing the marker plate with an identification mark;
A measuring jig characterized by

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