JP2022105500A - Semi-circular head type high-strength bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of bolt tightening work for a wide variety of structures in the complicated work environment of construction sites, aiming at automation and paperless of quality control.

SOLUTION: A semi-circular head type high-strength bolt tightened by a tightening tool in construction work comprises a bolt body without pintail, and a semi-circular head sandwiched by jigs. The head comprises a pair of jig sandwiching parts, which are parallel cut surfaces formed by the cut process.

SELECTED DRAWING: Figure 8

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a semi-circular head type high-strength bolt.

Recently, there is concern that the number of young workers working at construction sites will decrease due to the declining population and declining birthrate and aging population. Therefore, it is desired to improve the conventional construction method and management method in order to compensate for the decrease in the number of workers.
As an example of such improvement, for example, in bridge-related construction, in order to improve productivity, a bridge main girder connection structure that can be efficiently constructed with a small number of bolts has been proposed (for example, Patent Document 1). reference).

Japanese Unexamined Patent Publication No. 2011-174289

The main girder connection structure disclosed in Patent Document 1 does not require tightening work of high-strength bolts at the flange portion of the girder, but still requires tightening work of a large amount of high-strength bolts at the web portion. There are a considerable number of high-strength bolts used when it comes to large bridges.

There are two types of high-strength bolts, general high-strength hexagon bolts (see Fig. 8 (a)) and Torcia-type high-strength bolts (high-strength TC bolts) (see Fig. 8 (b)). Torcia type high-strength bolts are mainly used for steel frame and bridge related works. Here, FIG. 8A is a cross-sectional view when a high-strength hexagon bolt is tightened via a connecting plate CP at a joint portion where I-shaped bridge girders BGs are mated with each other, and is a sectional view thereof (b). ) Is a cross-sectional view when a Torsia type high-strength bolt is tightened via a connecting plate CP at a joint portion where I-type bridge girders BGs are joined to each other.

Torcia type high-strength bolts have the following merits.
(1) Since the bearing area of the bolt head is large, it is not necessary to set a washer on the bolt side, which saves time and effort.
(2) The pin tail receives a reaction force when tightened by the nut runner, and it is possible to prevent co-rotation during final tightening.
(3) By cutting the pin tail, it is possible to confirm that the pin tail has been forgotten to be tightened and that a predetermined axial force has been introduced.
(4) From the bolt tightening inspection procedure, there is no need for sampling inspection of the tightened part, and it can be simplified only by visual inspection.

On the other hand, the Torcia type high-strength bolt has the following disadvantages.
(1) It takes time and effort to collect the pintail and dispose of the scrap after cutting the pintail.
(2) The pintail cut surface (bolt side) has an acute angle, and a smooth sander treatment is required to prevent on-site paint peeling.
(3) Pintails can be recycled, but they are an environmental burden factor.
(4) When used as a rust-preventive bolt / plated bolt, it takes time and effort to repair and paint the pintail cut part, and it is rarely used.
(5) Defects are overlooked by judging the completion of tightening (visual judgment) by cutting the pin tail. Alternatively, it takes more time and cost to strengthen the check system so as not to overlook the defect. As the above-mentioned problems, for example, there is a problem that the nut runner is erroneously determined to have reached the appropriate torque due to an increase in the friction coefficient due to insufficient lubricating oil or poor meshing of the nuts.

Therefore, we will develop a semi-circular head type high-strength bolt (hereinafter referred to as an improved high-strength bolt) excluding the pintail as an improved type bolt that eliminates the above-mentioned disadvantages of the Torcia type high-strength bolt.
This improved high-strength bolt has the following merits.
(1) By omitting the pintail, the trouble of collecting the pintail and disposing of scrap at a high place can be saved.
(2) The semi-circular head shape reduces the number of washers by one, eliminating post-processing of the pintail cut portion and improving work efficiency.
(3) Among the high-strength hexagon bolts, Torcia-type high-strength bolts, and improved high-strength bolts, the manufacturing unit price of the improved high-strength bolt is the cheapest.
(4) Bolt tightening work can be simplified and automation (semi-automation) can be easily realized.
(5) It can be used as a rust preventive bolt / plated bolt in the same way as a high-strength hexagon bolt.

On the other hand, the improved high-strength bolt has the same disadvantages as the high-strength hexagon bolt. Specifically, it has the following demerits.
(1) It is necessary to confirm that it has been turned together and that it has been forgotten to be tightened.
(2) Extraction torque inspection (10% of the tightening completed part) after tightening work is required, and it takes time and effort to prepare documents for inspection results.

The annual quantity of bolts used in construction and civil engineering structures is enormous, and the advantages of using improved high-strength bolts are enormous, but it is necessary to take measures against the disadvantages.

The present invention has been made in view of such problems, and has improved the efficiency of bolt tightening work for a wide variety of structures in a complicated work environment at a construction site, and has made quality control automated and paperless. The purpose is to plan.

In order to solve the above problems, the invention according to claim 1 is
A semi-circular head type high-strength bolt that is tightened by a tightening tool in construction work.
Bolt body without pintail and
Equipped with a semi-circular head that is sandwiched by jigs,
The head is characterized by including a pair of jig sandwiching portions which are parallel cut surfaces formed by a cutting process.

According to the present invention, it is possible to improve the efficiency of bolt tightening work for a wide variety of structures in a complicated work environment at a construction site, and to automate and paperless quality control.

It is a schematic block diagram of the bolt tightening management system of this embodiment. It is a block diagram which shows the functional structure of a controller. It is a figure which shows the content example of the work history table. It is a flowchart which shows the work procedure at the time of performing a bolt tightening work. It is a figure which shows a scene of bolt tightening work. It is a figure which shows the arrangement relationship of a controller and a wireless nut runner when tightening a bolt inside a box girder, (a) is a figure which looked at the box girder from the side, (b) is the figure | box girder It is a sectional view of. It is a construction schematic of a high-rise building steel frame constructed across a railroad track on which a railroad vehicle runs, and is a diagram showing the arrangement relationship between a controller 1 and a wireless nut runner 2 when tightening bolts at the time of construction. Is. (A) is a cross-sectional view when high-strength hexagon bolts are tightened via a connecting plate at the joint where I-type bridge girders are mated together, and (b) is a cross-sectional view where I-type bridge girders are mated together. It is sectional drawing when the Torsia type high-strength bolt is tightened through the connecting plate in the joint part. It is a side view which shows the modification of the guide mechanism. It is a top view of the guide mechanism shown in FIG. It is sectional drawing of the guide mechanism shown in FIG. It is a top view which shows the other modification of the guide mechanism. It is a side view of the guide mechanism shown in FIG. It is a side view which shows the other modification of the guide mechanism. It is a top view of the guide mechanism shown in FIG. It is a figure which shows an example of the bolt tightening error display screen. It is a figure which shows another example of the bolt tightening error display screen. It is a figure which shows the other modification of the guide mechanism. It is a figure which shows the other structural example in the bending type rotary arm. It is a figure which shows the other modification of the guide mechanism. It is a figure which shows the other modification of the guide mechanism. It is a figure which shows the other modification of the guide mechanism. It is a figure which shows the other modification of the guide mechanism.

Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

<Configuration of bolt tightening management system 100>
First, the configuration of the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of the bolt tightening management system 100 of the present embodiment. In the following, the bolt tightening management system 100 of the present embodiment is, for example, a main girder such as an I girder (plate girder) or a box girder (box girder) constituting a large bridge having a total length of several hundred meters. The explanation will be given assuming that it is used for bolt tightening work at the connecting part of.
The type of the bridge girder is not limited to the above-mentioned I girder and box girder, and may be a bridge girder of other forms such as a T girder having a T-shaped cross section.
Further, the bolt tightening management system 100 of the present embodiment can be utilized even when assembling a high-rise building steel frame or constructing a relatively large-scale building, and can exert its effect.

As shown in FIG. 1, the bolt tightening management system 100 includes a controller 1, a nut runner 2, a bar code reader 3, a tablet terminal 4, and a server device 5.

The controller 1 is a computer that controls the bolt tightening management system 100. The controller 1 is arranged at a work site where bolt tightening work is performed. The details of the controller 1 will be described later.

The nut runner 2 is a tool (tightening tool) for tightening bolts. The nut runner 2 is connected to the controller 1 so that information and communication can be performed, and it is possible to perform bolt tightening work based on the tightening conditions set by the controller 1. Further, the nut runner 2 can switch the rotation direction to either a right rotation direction (clockwise) or a left rotation direction (counterclockwise).
The nut runner 2 is supposed to be used at a construction site as described above, and it is preferable to provide a waterproof cover and a curing cover for damage or the like suitable for the construction site.

Further, the nut runner 2 has a notification means, and when the bolt tightening work is performed, if the set tightening conditions are not satisfied, the nut runner 2 notifies that the tightening conditions are not satisfied. It is possible to do.

Specifically, the head portion of the nut runner 2 is provided with a green lamp, a yellow lamp, and a red lamp (all not shown), and when tightening work is performed on each bolt. When the tightening torque is within the allowable range of the preset target torque, the green lamp is turned on and a predetermined chime sound is output. On the other hand, if the tightening torque is less than the allowable range of the target torque, the yellow lamp is turned on and a predetermined beep sound is output, and if the tightening torque exceeds the allowable range of the target torque, the red lamp is turned on. At the same time, a beep sound different from the above beep sound is output.

As shown in FIG. 5, for example, the bar code reader 3 tightens bolts arranged at addresses such as “J-1-1”, “J-1-2”, and “J-1-3”. It is a device for reading the barcode BC attached to the right side of the bolt group when starting the work. The barcode reader 3 is connected to the controller 1 by a wireless LAN, and transmits the read barcode BC code information to the controller 1. Note that FIG. 5 is a diagram showing a scene of bolt tightening work at the connecting portion of the I girder.

The tablet terminal 4 is a terminal device used by a work manager at a work site where bolt tightening work is performed. The tablet terminal 4 is connected to the controller 1 by a wireless LAN, and by accepting an operation by the work manager to the operation unit of the terminal 4, various instruction inputs corresponding to the operation are input to the controller 1. It is possible to do it. Further, in the tablet terminal 4, the work history (work result) is acquired from the work history table 121 (described later) stored in the storage unit 12 of the controller 1 and displayed on the display unit (not shown) of the terminal 4. Is possible.

The server device 5 is connected to the controller 1 via a communication network N so as to be capable of information communication, and is a device for managing data received from the controller 1 (for example, data in the work history table 121 (described later)). be. The server device 5 is arranged at a place (for example, an office) different from the work site where the controller 1 is arranged.

The communication network N is assumed to be the Internet, for example, but may be another network such as a LAN (Local Area Network).

<Configuration of controller 1>
Next, the functional configuration of the controller 1 will be described with reference to FIG. FIG. 2 is a block diagram showing a functional configuration of the controller 1.

As shown in FIG. 2, the controller 1 includes a control unit 11, a storage unit 12, an operation unit 13, a display unit 14, a communication unit 15, a timekeeping unit 16, and a bus 17. Each part of the controller 1 is connected via the bus 17.

The control unit 11 includes a CPU (Central Processing Unit) that executes various programs stored in the storage unit 12 to perform predetermined operations and control each unit, and a memory that serves as a work area during program execution. (Both are not shown). The control unit 11 executes various processes in cooperation with the program stored in the storage unit 12.

The storage unit 12 includes a storage device such as an HDD (Hard Disk Drive) and an SSD (Solid State Drive) capable of writing and reading data, and stores various programs and files including data. As the data stored in the storage unit 12, for example, there is a work history table 121.

FIG. 3 is a diagram showing an example of the contents of the work history table 121.
The work history table 121 is a table for recording the work history when the bolt tightening work is performed, and is updated every time the bolt tightening work is performed.
The work history table 121 is based on the work date and time data in a state in which the address, work date and time, batch count, state, status information, tightening program, target torque, final torque, and final angle data are associated with each other. It is stored in descending order, that is, in the order of newest work date and time.

The operation unit 13 is provided with various function keys, receives press input of each key by the user, and outputs the operation information to the control unit 11. Further, the operation unit 13 has a touch panel or the like in which transparent electrodes are arranged in a grid pattern so as to cover the surface of the display unit 14, detects a position pressed by a finger, a stylus, or the like, and uses the position information as operation information. Output to the control unit 11.

The display unit 14 is composed of an LCD (Liquid Crystal Display) or the like, and performs various displays on the screen according to a display control signal from the control unit 11.

The communication unit 15 communicates with the nut runner 2, the barcode reader 3, and the tablet terminal 4 connected to the LAN. Further, the communication unit 15 wirelessly connects to the communication network N and communicates with an external device (for example, a server device 5 or the like) connected to the communication network N.

The timekeeping unit 16 has a timekeeping circuit (RTC: Real Time Clock), and the current time and time is timed by this timekeeping circuit and output to the control unit 11.

<< Operation of bolt tightening management system 100 >>
Next, the work procedure for tightening the improved high-strength bolt (semi-circular head high-strength bolt) will be described.
Here, the improved high-strength bolt is a bolt that is an improved version of the Torcia-type high-strength bolt, and has a semi-circular head high-strength bolt having a bolt body without a pintail and a semi-circular head. It is a bolt. The head of this improved high-strength bolt is cut as necessary at the ends facing each other across the axis of the bolt (cut the position about 2 to 3 mm inside from the end of the head). A pair of jig sandwiching portions are provided so that the head can be easily pinched by a jig (for example, a spanner) by removing the bow-shaped region in a plan view. This jig sandwiching portion is provided for the purpose of preventing the nut or washer from rotating together when tightening the improved high-strength bolt.

First, before explaining the work procedure, the structure to be the target of the tightening work will be described.
As shown in FIG. 5, the structure to be tightened is a connecting structure in which I-type bridge girders BG composed of a web and upper and lower flanges are connected to each other, and the I-type bridge girder BG is connected to each other. The improved high-strength bolts are tightened via the connecting plate CP at the joints where they are mated with each other.

FIG. 4 is a flowchart showing a work procedure when tightening the improved high-strength bolt.
As shown in FIG. 4, first, as a preliminary preparation, the address of each place (bolt group tightening target area) where the improved high-strength bolt tightening work is performed based on the construction drawings of the target construction work. The setting is made, and a barcode BC in which the tightening conditions corresponding to each set address are coded is created (step S1). Here, the tightening conditions are, for example, a target torque, a tightening angle, a number of tightening bolts, and the like when tightening the improved high-strength bolt.

Subsequently, as a preliminary preparation, each barcode BC created in step S1 is pasted to the corresponding address (step S2). This completes the preparations. FIG. 5 shows a state in which the barcode BC corresponding to each address is attached to each address of “J-1-1”, “J-1-2”, and “J-1-3”. As shown in FIG. 5, the address corresponding to the vicinity (for example, the right side) of the pasted barcode BC may be described.

Next, when the improved high-strength bolt is tightened (finally tightened) by the nut runner 2, the worker uses the barcode reader 3 to perform the tightening work at the address (for example, J-1-1 (Fig.)). Read the barcode BC corresponding to 5)) (step S3). As a result, the code information of the barcode BC is transmitted from the barcode reader 3 to the controller 1, and the tightening conditions for performing the tightening work in the controller 1 based on the code information of the barcode BC are set. Become. Further, at this time, the tablet terminal 4 is made to read a bar code (not shown) in which the worker ID assigned to the worker is coded to recognize the worker, and then the worker is operated. Information on the work conditions (for example, work date and time, work location (including bolt tightening order), worker name, etc.) input based on the information is transmitted from the tablet terminal 4 to the controller 1. As a result, in the controller 1, information on the working condition is set in association with the tightening condition, and the information can be confirmed. As a result, in the bolt group at each address, each improved high-strength bolt can be identified by assigning a number to each improved high-strength bolt. Therefore, for example, an error occurs regarding final tightening. If so, the location of the corresponding improved high-strength bolt will be easier to understand.

Each improved high-strength bolt is first tightened before the tightening work (final tightening) by the nut runner 2. This primary tightening is performed using a commonly used electric impact. When the primary tightening is performed, the automatic marking socket is attached to the electric impact and the tip of the bolt is colored to save the trouble of manually marking as in the past and prevent forgetting to tighten the primary tightening. do.

Next, after performing calibration in advance, the nut runner 2 performs tightening work (final tightening) on each improved high-strength bolt of the bolt group arranged at the target address (step S4). .. At this time, the work history is sequentially stored in the work history table 121. Here, the nut runner 2 is slidably held in the vertical direction and the horizontal direction by the guide mechanism 6 (see FIG. 5). More specifically, the guide mechanism 6 is detachably fixed to the flange of the bridge girder. Furthermore, the first rail that is long in the vertical direction, the second rail that is long in the horizontal direction that can move vertically along the first rail, and the second rail that is provided in the second rail and moves horizontally along the second rail. It has a possible holding portion, and the nut runner 2 is held by this holding portion. As a result, when the tightening work is performed on each bolt, the nut runner 2 can be appropriately moved by using the guide mechanism 6, so that the burden of the tightening work can be reduced. There is.
The guide mechanism 6 is not limited to the above configuration. For example, the guide mechanism 6 has a fixed portion that can be detachably fixed to the bridge girder, a link mechanism that extends from the fixed portion, and the link mechanism. It may be an arm type guide mechanism having a holding portion provided at the tip and holding the nut runner 2.

Further, when the final tightening is performed, the tablet terminal 4 is made to read the barcode BC corresponding to the address where the final tightening is performed, so that the work history at the address is read from the work history table 121 of the controller 1. It can be acquired and displayed on the display unit (not shown) of the terminal 4. As a result, the work manager or the worker can immediately check the work history at each address at the work site. In other words, it is possible to check whether or not the tightening has been forgotten by rotating together during the final tightening work.

When the final tightening is performed, the nut runner 2 is equipped with an automatic marking socket and the tip of the bolt is colored (colored with a color different from the marking color at the time of the primary tightening) to tighten the final tightening. Prevent forgetting. Further, when the final tightening is performed, if the target torque value and the tightening angle do not fall within the allowable range due to factors such as co-rotation, the lamp provided on the head portion of the nut runner 2 as described above. An error message is displayed and an error sound is output from the speaker.

Next, the controller 1 transmits the work history stored in the work history table 121 to the server device 5 via the communication unit 15 and saves the work history (step S5).

As described above, the bolt tightening management system 100 of the present embodiment includes a nut runner (tightening tool) 2 that tightens bolts based on preset tightening conditions, and a barcode (tightening tool) that encodes the tightening conditions. Code information) A barcode reader (reading device) 3 for reading BC and a controller 1 for setting tightening conditions are provided, and the barcode BC is the address of each bolt group having the same tightening conditions (tightening target). The controller 1 sets the tightening conditions corresponding to the bar code BC read by the bar code reader 3, and the work result of the bolt tightening work is displayed on the work history table 121. Record.
Therefore, according to the bolt tightening management system 100, when the tightening work of the bolt group at each address is started, the bar code BC provided corresponding to the address is read by the bar code reader 3. Since the tightening conditions are set by the controller 1, the tightening conditions can be smoothly set even in a complicated work environment at a construction site. In addition, by recording the work result of the bolt tightening work in the work history table 121, it is possible to confirm that the bolts have been rotated together or forgotten to be tightened during the tightening work, and that the work result is certified in quality control. You will be able to save it as a book. As a result, it is possible to improve the efficiency of bolt tightening work in a complicated work environment at a construction site, and to automate quality control and make it paperless.

Further, the bolt tightening management system 100 of the present embodiment includes a guide mechanism 6 that guides the movement of the nut runner 2 in a predetermined direction.
Therefore, according to the bolt tightening management system 100, when the tightening work is performed on each bolt, the nut runner 2 can be appropriately moved by using the guide mechanism 6, so that the burden of the tightening work is borne. Can be mitigated.

Further, according to the bolt tightening management system 100 of the present embodiment, the improved high-strength bolt is targeted for the tightening work, but since the work result is stored in the work history table 121, the tightening work is completed. It is possible to save the trouble of performing a sampling inspection later. In addition, since the work results can be managed by numerical values such as torque value and rotation angle, the work results can be effectively used as inspection materials during construction, completion inspection, confirmation material such as aging deterioration, and the like. Further, when the tightening work is performed on each of the improved high-strength bolts, it is not necessary to collect the pintail portion or repair and paint the pintail cut portion, so that the burden of the tightening work can be reduced.

Further, the bolt tightening management system 100 of the present embodiment causes the controller 1 to transmit the work history recorded in the work history table 121 to the server device 5 via the communication unit 15. The data related to the work history is stored in the storage unit of the server device 5.
Therefore, according to the bolt tightening management system 100, the work result in the bolt tightening work can be confirmed from a place other than the work site (for example, an office). Then, the data related to the work history stored in the server device 5 can be searched from a place other than the work site (for example, an office) through an external information communication terminal including the tablet terminal 4. In other words, since the work history contains various data such as the street address and work date and time, it is possible to search for each type of data or to search for the position of the bolt where the tightening error occurred. ..

Although the present invention has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment and can be changed without departing from the gist thereof.

For example, in the above embodiment, the nut runner 2 is connected to the controller 1 by wire (see FIG. 1), but may be connected by a wireless LAN, for example. A plurality of (for example, five) wireless nut runners 2 connected to the controller 1 by this wireless LAN can be used at the same time.
6 (a) and 6 (b) are views showing the arrangement relationship between the controller 1 and the wireless nut runner 2 when the bolts are tightened outside or inside the box girder. FIG. 6A is a side view of the box girder, and FIG. 6B is a cross-sectional view of the box girder.
As shown in FIGS. 6 (a) and 6 (b), when the bolts are tightened outside (ceiling) or inside the box girder, they are wirelessly connected via a wireless LAN router and a wireless antenna. By wirelessly connecting the nut runner 2 and the controller 1 located outside the box girder, the tightening work can be performed without worrying about the wiring, so that the work efficiency can be improved. Further, since a plurality of wireless nut runners 2 can be used at the same time, work efficiency can be further improved. In addition, information transmission and work instructions can be performed in real time between the wireless nut runner 2 and the controller 1. Further, the box girder is often provided with a manhole, and in such a case, by arranging a wireless antenna near the manhole, information transmission and work instructions between the wireless nut runner 2 and the controller 1 are performed. Can be made smoother.

Further, the bolt tightening management system 100 using the wireless nut runner 2 can be utilized even when assembling a high-rise building steel frame.
FIG. 7 is a construction schematic diagram of a high-rise building steel frame constructed so as to straddle a railroad track on which a railroad vehicle travels, and includes a controller 1 and a wireless nut runner 2 for tightening bolts at the time of construction. It is a figure which shows the arrangement relation of.

As shown in FIG. 7, when the bolt tightening work is performed at the time of assembling the high-rise steel frame, for example, a wireless antenna is placed on the floor where the worker performs the tightening work, and the wireless antenna is used. Information is transmitted and work instructions are given between the wireless nut runner 2 and the controller 1 located on the ground. In addition, when tightening bolts when assembling a large truss steel frame that is bridged between high-rise steel frames, for example, a controller 1 and a wireless LAN router are placed on the top floor of the high-rise steel frame, and a worker tightens them. By arranging a wireless antenna in the vicinity of the work, information transmission and work instructions are performed between the wireless nut runner 2 and the controller 1. In this way, when assembling a high-rise building steel frame, by wirelessly connecting the wireless nut runner 2 and the controller 1, the tightening work can be performed without worrying about the wiring, so that the work efficiency is improved. Improvement is planned. Further, since a plurality of wireless nut runners 2 can be used at the same time, work efficiency can be further improved. In addition, information transmission and work instructions can be performed in real time between the wireless nut runner 2 and the controller 1.

Further, in the above embodiment, the barcode BC is used as the code information in which the tightening conditions are coded, but for example, a QR code (registered trademark) may be used as the code information.

Further, in the above embodiment, the work procedure for performing the tightening work for the improved high-strength bolt has been described, but for example, the high-strength hexagon bolt may be targeted.

Further, in the above embodiment, the tablet terminal 4 is equipped with a bar code reading function capable of reading the bar code BC, and by reading the bar code BC by the tablet terminal 4, the work at the address corresponding to the bar code BC is performed. The history (work result) may be acquired from the controller 1 and the work history may be displayed on the display unit (not shown). Further, by reading the barcode BC with the tablet terminal 4, a predetermined work instruction regarding the tightening work at the address corresponding to the barcode BC is given to the controller 1 based on the operation to the operation unit of the terminal 4. You may be able to do it.

The bolt tightening management system is also used in other industries (for example, the automobile industry), but in the other industries, in the so-called line production method, the structure flows to the worker by a belt conveyor or the like. It is intended for sites where work is performed. On the other hand, when constructing a huge structure such as a high-rise building steel frame or a bridge at a construction site, it is difficult to construct because it requires work at a high place and is easily affected by weather conditions due to outdoor work. Bolt tightening management systems used in other industries cannot be easily applied. In addition, if the construction location of high-rise building steel frames, bridges, etc. is on rivers, seas, mountains, urban areas (especially locations that straddle railway tracks), the construction difficulty becomes even higher, and the above-mentioned bolt tightening management system Is becoming more and more difficult to apply. Furthermore, at construction sites, the work ratio related to high-strength bolts is large, the connection between members is an important part of the structure, and quality control under various construction conditions is strictly required. Bolt tightening management system cannot be easily applied.

[Modification example]
The embodiment to which the present invention is applicable is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention. Hereinafter, a modified example will be described. The following modifications may be combined as much as possible. Further, in each of the following modifications, the elements common to the above-described embodiment are designated by a common reference numeral, and the description thereof will be omitted or simplified.

[Modification 1]
Tightening work of various bolts and nuts such as improved high-strength bolts and high-strength hexagon bolts mentioned in the above-described embodiment is performed by the nut runner 2, but the nut runner 2 is heavy and the power cable and the like are also used. Not only is it inconvenient to carry because it is connected, but there is also the problem that if the tightening work continues in an unreasonable position, the burden on the worker's body will be great. Therefore, it has been required to reduce the burden on the body of the worker performing the tightening work.

As shown in FIGS. 9 to 11, the structure to be tightened in this modification is a connecting structure in which the I-shaped bridge girder BG composed of the web 20 and the upper and lower flanges 21 is connected to each other. ing. In the connecting structure in this modification, bolts and nuts are tightened via connecting plates (hereinafter, a plurality of splicing plates 22, 23, 24) at the joint portion where the lengthwise ends of the bridge girder BG are joined to each other. Work is being done.

Of the plurality of splicing plates 22, 23, 24, the first splicing plate 22 is arranged so as to straddle between both side surfaces of the web 20 of the bridge girder BG connected to each other.
The second splicing plate 23 is arranged so as to straddle between the upper surfaces of the upper flange 21 of the bridge girder BG connected to each other and between the lower surfaces of the lower flange 21.
The third splicing plate 24 is arranged so as to straddle between the lower surfaces of the upper flange 21 of the bridge girder BG connected to each other and between the upper surfaces of the lower flange 21.

Each of the splicing plates 22, 23, 24 is a rectangular plate-shaped steel plate, and each of the splicing plates 22, 23, 24 is formed with a plurality of through holes through which the shaft portion of the bolt is passed.
The plurality of through holes are arranged vertically and horizontally in a grid pattern along the sides of the splicing plates 22, 23, and 24. In addition, the intervals in the vertical direction (basically pointing in the vertical direction and may be in the vertical direction depending on the angle of the connecting structure) between these plurality of through holes are also in the horizontal direction (basically the length of the bridge girder BG). It points in the direction along the vertical direction, and may be in the horizontal direction depending on the angle of the connecting structure).
Therefore, a plurality of bolts (bolt groups) and nuts through which the shaft portion is passed through the plurality of through holes are also arranged in a grid pattern at equal intervals in the vertical and horizontal directions.

In this modification, the nut runner 2 that tightens the bolts and nuts has a guide mechanism 30 in the vertical direction (which may be vertical depending on the angle of the connecting structure) and the lateral direction (basically, the bridge girder). It points in a direction along the length direction of the BG, and may be in the horizontal direction depending on the angle of the connecting structure) and is held so as to be slidable.
That is, the guide mechanism 30 of this modification is a guide device 30 that holds the nut runner 2 and guides its vertical and lateral movements, and includes the first guide frame 31 and the second guide frame 32. , A holding portion 33, an urging portion 34, and a positioning portion 35.

First, the first guide frame 31 is installed so as to be bridged between the upper and lower flanges 21 of the bridge girder BG, and has a pair of frame members 31a, a slide portion 31b, and a fixing portion 31c.
The pair of frame members 31a are guide rails, and are arranged at intervals in the lateral direction from each other.
The slide portion 31b is configured to be slidable along the length direction of the pair of frame members 31a while holding the pair of frame members 31a.
The fixing portion 31c is provided at the upper end portion and the lower end portion of the pair of frame members 31a, and is fixed to the upper and lower flanges 21 of the bridge girder BG. The fixing portion 31c has a bracket protruding from the pair of frame members 31a toward the bridge girder BG, and a fixing plate integrally provided on the lower surface of the tip of the bracket, and the fixing plate is attached to the upper and lower flanges 21 of the bridge girder BG. It is fixed. The fixing method is a method of firmly sandwiching the fixing plate and the upper and lower flanges 21 with a clamp, a method of providing an electric magnet on the fixing plate and firmly fixing the fixing plate to the upper and lower flanges 21 by magnetic force, a fixing plate and the upper and lower flanges. A method of forming through holes for passing fixing bolts on both sides of the flange 21 and firmly connecting the fixing plate and the upper and lower flanges 21 with fixing bolts and nuts can be mentioned. Other methods are adopted as appropriate.
That is, the first guide frame 31 is detachably provided with respect to the bridge girder BG.

Subsequently, the second guide frame 32 is attached to the slide portion 31b of the first guide frame 31, and has an attachment portion 32a, a first arm 32b, and a second arm 32c.
The attachment portion 32a is a portion attached to the slide portion 31b of the first guide frame 31, and slides along with the slide portion 31b along the length direction of the pair of frame members 31a.
The first arm 32b and the second arm 32c are used as a set and are configured to be expandable and contractible. That is, a state in which the second arm 32c located on the tip end portion (nut runner 2) side is inserted into the inside of the first arm 32b formed in a cylindrical shape located on the base end portion (mounting portion 32a) side. The second arm 32c can move forward and backward along the length direction (the length direction of the first arm 32b) with respect to the first arm 32b.
Further, the mounting portion 32a is formed in a cylindrical shape, and the first arm 32b is inserted therein. The first arm 32b is also in a state where it can move forward and backward along the length direction (the length direction of the mounting portion 32a) with respect to the mounting portion 32a. As a result, the lateral movement distance of the nut runner 2 can be extended, and the nut runner 2 can be brought closer to the first guide frame 31 to perform the tightening work.

Subsequently, the holding portion 33 is integrally provided at the tip end portion of the second guide frame 32 (second arm 32c), and the nut runner 2 is moved closer to the nut and the bolt side and separated from the nut and the bolt. It is formed to be long in the direction of making it (hereinafter, the direction of proximity and separation).
Further, the holding portion 33 is formed in a substantially C-shaped cross section, and the opened portion is arranged so as to face the nut runner 2 side. Then, the held portion 2a of the nut runner 2 is held in a state where it can be slidably moved along the proximity separation direction by both edge portions of the holding portion 33 facing the opened portion.
The held portion 2a is attached to the main body portion of the nut runner 2 so as to be able to rotate 180 degrees around the axis of the main body portion along the proximity separation direction. That is, the handle portion of the nut runner 2 can rotate from vertically above to vertically downward in the state shown in FIG. This makes it easier to match the wrench socket at the tip of the nut runner 2 with the nut.

Subsequently, the urging portion 34 is provided at the upper end portion of the pair of frame members 31a in the first guide frame 31. Then, such an urging portion 34 applies an urging force acting on the slide portion 31b in the direction toward the upper end portion of the pair of frame members 31a (the direction opposite to the direction of gravity). This urging force is set so that the nut runner 2 and the second guide frame 32 are pushed back in the direction opposite to the direction of gravity, balanced, or slightly moved in the direction of gravity.
More specifically, the urging portion 34 in this modification uses a take-up type constant load spring. The constant load spring includes a winding portion (drum) attached to the pair of frame members 31a and a metal strip wound around the winding portion, and the strip is pulled out from the winding portion. Then, the obi body has an urging force to return to its original state. By this urging force, the slide portion 31b is urged in the direction toward the upper end portion of the pair of frame members 31a. That is, the slide portion 31b moved downward along the pair of frame members 31a is moved upward by the urging force of the urging portion 34 and returned to the original position, or is easily moved upward. ..
At the tip of the band in the urging portion 34, a plate-shaped connecting portion 34a connected to the slide portion 31b is provided. Although the connecting portion 34a in this modification is connected to the slide portion 31b of the first guide frame 31, it may be connected to the mounting portion 32a of the second guide frame 32.
When the guide mechanism 30 is provided with such an urging portion 34, the nut runner 2, which is a heavy object, always moves upward by the urging force of the urging portion 34 and tries to return to the original position. , It is possible to reduce the burden on the worker who tightens the bolts and nuts.

Subsequently, the positioning unit 35 positions the nut runner 2 in the vertical direction and the lateral direction, and a cross laser marker (cross laser pointer) is adopted in this modification.
In the cross laser marker, a device main body that irradiates a cross-shaped laser beam 35a is provided at the end of the holding portion 33 on the bridge girder BG side. The central intersection of the cross-shaped laser beam 35a is a position where the wrench socket of the nut runner 2 moves close to the nut and bolt to be tightened. Therefore, the cross-shaped laser beam 35a is visually aligned with the nuts and bolts located adjacent to each other in the vertical and lateral directions (cross direction) of the nuts and bolts to be tightened, or through holes. The position of the wrench socket of the nut runner 2 can be matched with the positions of the nuts and bolts to be tightened. After the positioning is completed in this way, the nut runner 2 is moved close to the nut and bolt side to be tightened to perform the tightening work. Further, if necessary, the main body portion of the nut runner 2 is rotated with respect to the held portion 2a to match the wrench socket at the tip of the nut runner 2 with the nut.
When the nut runner 2 is positioned using the positioning portion 35 in this way, the time for tightening work can be shortened, so that the time for moving the heavy nut runner 2 can also be shortened, and the bolts and nuts can be tightened. It is possible to reduce the burden on the worker who performs the work.
Although the laser beam 35a has a cross shape, it may be T-shaped (three directions) or L-shaped (two directions).
Further, although the positioning portion 35 in this modification employs a cross laser marker, the present invention is not limited to this, and a sighting device attached to the main body portion of the nut runner 2 and provided so as not to rotate may be adopted. .. This aiming device also aims at the nuts and bolts located adjacent to each other in the vertical and lateral directions (cross direction) of the nuts and bolts to be tightened, or by aiming (for example, a slit extending in the crossing direction). , The position of the wrench socket of the nut runner 2 can be matched with the positions of the nuts and bolts to be tightened.
Further, by installing a tracking type laser marker, the order of tightening work may be specified in advance, and the tightening work may be performed by the nut runner 2 while tracking the order.

The guide mechanism 30 in this modification can move the nut runner 2 held by the holding portion 33 in the vertical direction and along the length direction of the bridge girder BG. As a result, the tightening work of the bolts and nuts provided on the first splicing plate 22 on the side surface of the web 20 can be performed while being guided by the guide mechanism 30.
If the drive unit is applied to the slide unit 31b and the arms 32b and 32c so that the first guide frame 31 and the second guide frame 32 can be automatically controlled, the movement of the nut runner 2 is entrusted to the drive unit. Therefore, the burden on the worker can be further reduced. In addition to this, the guide mechanism 30 itself may be made to be able to be transported by automatic or manual transportation means.

According to the present modification as described above, the nut runner 2 can be easily moved vertically and laterally according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, so that the nut tightening work can be performed. It is possible to reduce the burden on the worker who performs the work.
Further, since the guide mechanism 30 is detachable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.

In the guide mechanism 30 of this modification, the held portion 2a is attached to the main body portion of the nut runner 2 so as to be able to rotate 180 degrees around the axis of the main body portion along the proximity separation direction. However, in addition to this, a second rotation mechanism capable of rotating 180 degrees in the vertical direction may be provided. Although it depends on the length of the holding portion 33 (the length in the web 20 direction), by providing the second rotation mechanism, the bolts and nuts are tightened on the lower surface of the upper flange 21 and the upper surface of the lower flange 21. It is also possible to do.

[Modification 2]
In this modification, the nut runner 2 for tightening the bolts and nuts has a guide mechanism 40 provided on the upper surface side of the bridge girder BG in the vertical direction (direction along the length direction of the bridge girder BG) and the lateral direction (bridge girder BG). It is held so that it can be slidably moved in the width direction of the flange 21).
That is, the guide mechanism 40 of this modification is a guide device 40 that holds the nut runner 2 and guides the movement in the vertical direction and the horizontal direction, and is a fixed mast 41, a bending type rotary arm 42, and a holding portion. A 43, an urging unit 44, and a positioning unit 45 are provided.
The guide mechanism 40 in this modification is provided on the upper surface side of the bridge girder BG, but is not limited to this, and may be provided on the lower surface side (described later) or on the side surface side. May be (described later).

First, the fixed mast 41 is installed on the upper surface of the upper flange 21 of the bridge girder BG, and has a mast main body 41a and a fixed portion 41b.
The mast body 41a is formed in a columnar shape.
The fixing portion 41b is a plate-shaped body integrally provided at the lower end portion of the mast main body 41a, and is fixed to the upper flange 21 in the bridge girder BG. The fixing method includes a method of firmly sandwiching the fixing portion 41b and the upper flange 21 with a clamp, a method of providing an electromagnet in the fixing portion 41b and firmly fixing the fixing portion 41b to the upper flange 21 by magnetic force, and a fixing portion 41b. A method of forming through holes for passing fixing bolts in both the upper flange 21 and the upper flange 21 and firmly connecting the fixing portion 41b and the upper flange 21 with fixing bolts and nuts can be mentioned. Alternatively, other methods are appropriately adopted. Instead of forming the fixing portion 41b into a plate-like body, the fixing portion 41b itself may be configured by a clamp.
That is, the fixed mast 41 is detachably provided with respect to the bridge girder BG.

Subsequently, the bending type rotary arm 42 is an arm whose base end portion is rotatably provided around the axis of the fixed mast 41 with respect to the fixed mast 41, and the rotation holding portion 42a, the first arm 42b, and the like. It has a second arm 42c and a support brace 42d.
The rotation holding portion 42a is located at the base end portion of the bending type rotating arm 42, is a portion for holding the upper end portion of the fixed mast 41, and is rotatable around the axis of the fixed mast 41.
The first arm 42b and the second arm 42c are used as a set and are configured to be rotatable at the connecting portion between the first arm 42b and the second arm 42c. That is, the base end portion of the first arm 42b is integrally provided with the rotation holding portion 42a, and the second arm 42c is rotatably connected to the tip end portion. The base end portion of the second arm 42c is rotatably connected to the first arm 42b, and a holding portion 43 (nut runner 2) is provided at the tip end portion. As a result, the first arm 42b and the second arm 42c, which are rotatably connected to each other, are configured as one arm whose central portion bends in a dogleg shape. That is, in the bending type rotary arm 42, the nut runner 2 is rotated in a range in which the first arm 42b (rotation holding portion 42a) rotates around the axis of the fixed mast 41 and the second arm 42c rotates with respect to the first arm 42b. You can move it within the range you want.

Subsequently, the holding portion 43 is integrally provided at the tip end portion of the bending type rotary arm 42 (second arm 42c), and the nut runner 2 is moved closer to the nut and the bolt side and separated from the nut and the bolt. It is formed long in the direction of making it (proximity separation direction: vertical direction).
The holding portion 43 is formed in a substantially C-shaped cross section, and the opened portion is arranged so as to face the nut runner 2 side. Then, the held portion 2a of the nut runner 2 is held in a state where it can be slidably moved along the proximity separation direction by both edge portions of the holding portion 43 facing the opened portion.
The held portion 2a is attached to the main body portion of the nut runner 2 so as to be able to rotate 180 degrees around the axis of the main body portion along the proximity separation direction.

Subsequently, the urging portion 44 is provided at the upper end portion of the holding portion 43. Then, such an urging portion 34 applies an urging force acting on the held portion 2a of the nut runner 2 in a direction toward the upper end portion of the holding portion 43 (direction opposite to the direction of gravity). This urging force is set so that the nut runner 2 is pushed back in the direction opposite to the direction of gravity, balanced, or slightly moved in the direction of gravity.
A take-up type constant load spring is used for the urging portion 44 in this modification, and the connecting portion 44a provided at the tip of the metal strip is connected to the held portion 2a of the nut runner 2. Has been done.
When the guide mechanism 40 is provided with such an urging portion 44, the nut runner 2, which is a heavy object, always moves upward by the urging force of the urging portion 44 and tries to return to the original position. , It is possible to reduce the burden on the worker who tightens the bolts and nuts.

Subsequently, the positioning unit 45 positions the positions of the nut runner 2 in the vertical direction and the lateral direction, and a cross laser marker (cross laser pointer) is adopted in this modification.
In the cross laser marker, a device main body that irradiates a cross-shaped laser beam 45a is provided at the bridge girder BG side end portion (lower end portion) of the holding portion 43. The positioning method is the same as that of the positioning unit 35 described above.
When the nut runner 2 is positioned using the positioning portion 45 in this way, the time for tightening work can be shortened, so that the time for moving the heavy nut runner 2 can also be shortened, and the bolts and nuts can be tightened. It is possible to reduce the burden on the worker who performs the work.

The guide mechanism 40 in this modification can move the nut runner 2 held by the holding portion 43 along the upper surface of the upper flange 21 of the bridge girder BG. As a result, the tightening work of the bolts and nuts provided on the second splicing plate 23 on the upper surface of the upper flange 21 can be performed while being guided by the guide mechanism 40.
The nut runner 2 is equipped with a reaction force fitting 2b that is in contact with adjacent bolts or nuts, and the reaction force fitting 2b is brought into contact with the adjacent bolts or nuts to improve the tightening force of the nut runner 2. May be good.

According to this modification as described above, the nut runner 2 can be easily moved in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, so that the nut tightening work can be performed. It is possible to reduce the burden on the worker who performs the work. Further, since the bending type rotary arm 42 is adopted and the fixed mast 41 is operated around the rotation center, the nut runner 2 can be quickly moved by a slight rotation operation by the worker even in a narrow work space. ..
Further, since the guide mechanism 40 is removable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.

Although the guide mechanism 40 in this modification is provided on the upper surface side of the bridge girder BG, it may be provided on the lower surface side. When the guide mechanism 40 is provided on the lower surface side of the bridge girder BG, the urging portion 44 may be a constant load spring, or another urging such as a coil spring for urging the nut runner 2 upward. It may be a means. The mounting position of the urging portion 44 may also be changed as appropriate. That is, when the guide mechanism 40 is provided on the lower surface side of the bridge girder BG, it is necessary to perform the tightening work by the nut runner 2 upward, so that the guide mechanism 40 is urged to a position where it is easy to support when performing the upward tightening work. A portion 44 is provided.
When the guide mechanism 40 in this modification is provided on the side surface side of the bridge girder BG, the first guide frame 31 and the urging portion 34 are used instead of the fixed mast 41 and the urging portion 44. You may.
Further, the guide mechanism 40 in this modification may be provided on the lower surface side of the upper flange 21 or the upper surface side of the lower flange 21.

[Modification 3]
In this modification, the nut runner 2 that tightens the bolts and nuts slides in the vertical direction (direction along the length direction of the bridge girder BG) and lateral direction (width direction of the bridge girder BG / flange 21) by the guide mechanism 50. It is held movable.
That is, the guide mechanism 50 of this modification is a guide device 50 that holds the nut runner 2 and guides the movement in the vertical direction and the horizontal direction, and includes the first guide frame 51, the second guide frame 52, and the like. It includes a holding unit 53, an urging unit 54, a positioning unit 55, and a distance measuring unit 56.
The guide mechanism 50 in this modification is provided on the upper surface side of the bridge girder BG, but is not limited to this, and may be provided on the lower surface side.

First, the first guide frame 51 is installed so as to be bridged between one side edge and the other side edge of the upper flange 21 of the bridge girder BG, and the pair of frame members 51a, the slide portion 51b, and the pair of fixings are fixed. It has legs 51c and.
The pair of frame members 51a are guide rails, and are arranged at intervals in the vertical direction (direction along the length direction of the bridge girder BG) from each other.
The slide portion 51b is configured to be slidable along the length direction of the pair of frame members 51a while holding the pair of frame members 51a.
The pair of fixed legs 51c are provided at one end and the other end of the pair of frame members 51a, and are fixed to the upper flange 21 of the bridge girder BG. The lower end of the pair of fixed legs 51c is fixed to one side edge and the other side edge of the upper flange 21, and the lengthwise side end of the pair of frame members 51a is attached to the upper end. The lower end of the fixed leg 51c can be fixed by firmly sandwiching the lower end and the upper flange 21 with a clamp, or by providing an electromagnet at the lower end of the fixed leg 51c and using magnetic force to attach the lower end of the fixed leg 51c to the upper flange 21. A method of firmly fixing, a through hole for passing a fixing bolt is formed in both the lower end of the fixing leg 51c and the upper flange 21, and the lower end of the fixing leg 51c and the upper flange 21 are firmly fixed with the fixing bolt and the nut. One method or the other method is appropriately adopted.
That is, the first guide frame 51 is detachably provided with respect to the bridge girder BG.

Subsequently, the second guide frame 52 is attached to the slide portion 51b of the first guide frame 51, and has an attachment portion 52a, a first arm 52b, and a second arm 52c.
The attachment portion 52a is a portion attached to the slide portion 51b of the first guide frame 51, and slides along with the slide portion 51b along the length direction of the pair of frame members 51a.
The first arm 52b and the second arm 52c are used as a set and are configured to be expandable, and the second arm 52c can advance and retreat with respect to the first arm 52b along the length direction of the first arm 52b. It is in a state of being.
Further, the mounting portion 52a is formed in a cylindrical shape, and the first arm 52b is inserted therein, and the first arm 52b is also in a state where it can move forward and backward along the length direction of the mounting portion 32a. .. As a result, the lateral movement distance of the nut runner 2 can be extended, and the nut runner 2 can be brought closer to the first guide frame 51 to perform the tightening work.

Subsequently, the holding portion 53 is integrally provided at the tip end portion of the second guide frame 52 (second arm 52c), and the nut runner 2 is moved closer to the nut and the bolt side and separated from the nut and the bolt. It is formed to be long in the direction of making it (hereinafter, the direction of proximity and separation).
The holding portion 53 is formed in a substantially C-shaped cross section, and the opened portion is arranged so as to face the nut runner 2 side. Then, the held portion 2a of the nut runner 2 is held in a state where it can be slidably moved along the proximity separation direction by both edge portions of the holding portion 53 facing the opened portion.
The held portion 2a is attached to the main body portion of the nut runner 2 so as to be able to rotate 180 degrees around the axis of the main body portion along the proximity separation direction.

Subsequently, the urging portion 54 is provided at the upper end portion of the holding portion 53. Then, such an urging portion 54 applies an urging force acting on the held portion 2a of the nut runner 2 in a direction toward the upper end portion of the holding portion 53 (direction opposite to the direction of gravity). This urging force is set so that the nut runner 2 is pushed back in the direction opposite to the direction of gravity, balanced, or slightly moved in the direction of gravity.
A take-up type constant load spring is used for the urging portion 54 in this modification, and the connecting portion 54a provided at the tip of the metal strip is connected to the held portion 2a of the nut runner 2. Has been done.
When the guide mechanism 50 is provided with such an urging portion 54, the nut runner 2, which is a heavy object, always moves upward by the urging force of the urging portion 54 and tries to return to the original position. , It is possible to reduce the burden on the worker who tightens the bolts and nuts.

Subsequently, the positioning unit 55 positions the nut runner 2 in the vertical direction and the lateral direction, and a cross laser marker (cross laser pointer) is adopted in this modification.
In the cross laser marker, a device main body that irradiates the cross-shaped laser beam 55a is provided at the bridge girder BG side end portion (lower end portion) of the holding portion 53. The positioning method is the same as that of the positioning unit 35 described above.
When the nut runner 2 is positioned using the positioning portion 55 in this way, the time for tightening work can be shortened, so that the time for moving the heavy nut runner 2 can also be shortened, and the bolts and nuts can be tightened. It is possible to reduce the burden on the worker who performs the work.

Subsequently, the distance measuring unit 56 (also referred to as a distance measuring sensor or a distance measuring meter) is attached to the side surface of the mounting portion 52a of the second guide frame 52, and the moving distance of the mounting portion 52a in the vertical direction and the horizontal direction is determined. Can be measured. The distance measuring method is not particularly limited to optical type, radio wave type, ultrasonic type, mechanical type, etc., and a simple measure or roller type distance measuring meter may be adopted.
More specifically, in this modification, a distance measuring sensor that employs any of optical, radio wave, and ultrasonic distance measuring methods is adopted, and the main body portion provided in the mounting portion 52a is adopted. Further, the reflecting plate 56a for reflecting the transmitted wave (projection) emitted from the main body is provided. The ranging unit 56 in this modification is configured to emit transmitted waves (flooding) in both the vertical direction and the horizontal direction, and two reflectors 56a are used for the vertical direction and the horizontal direction. There is.
In addition, as a configuration that emits transmitted waves (flooding) in both the vertical and horizontal directions, a function that can simultaneously emit transmitted waves (flooding) in both the vertical and horizontal directions and simultaneously receive and process reflected waves. It is also possible to adopt a device having a function of separately performing transmission / reception for the vertical direction and transmission / reception for the horizontal direction and processing them separately.
When the distance measuring unit 56 is provided in this way, the position of the nut runner 2 in the vertical direction and the horizontal direction can be constantly measured. As a result, the tablet terminal 4 can monitor at which position the bolts and nuts have been tightened.
When the bolts and nuts are arranged in a grid pattern, it is easy to manage the data of the positions of the bolts and nuts by using the distance measuring unit 56. For example, the distance measuring unit 56 determines how much the nut runner 2 moves in the vertical and horizontal directions from the bolts and nuts at the four corners of the grid and the bolts and nuts at the joint positions. It turns out easily. That is, by first inputting the data of the positions of the bolts and nuts as the reference, the data can be easily managed, and further, the association with the moving distance of the nut runner 2 can be easily performed, and the data can be easily converted.

The position where the tightening work of the bolt and the nut is completed can be monitored by using, for example, the above-mentioned ranging unit 56 or by taking a picture with a camera. Further, in the case of the distance measuring unit 56, data processing can be performed in the order in which the distances are measured as they are in the order in which the tightening work is performed. However, when an error occurs in tightening, the position where the error occurs cannot be specified on the display screen of the tablet terminal 4 or the like. Therefore, it is required to be able to identify the position where the error has occurred on the display screen of the tablet terminal 4 or the like.
In this modification, for example, as shown in FIGS. 16 and 17, the tightening error occurrence position is displayed so that the position can be specified on the display screen of the tablet terminal 4 or the like.

When specifying the position where the tightening error occurs by taking a picture with a camera, for example, the wrench socket of the nut runner 2 with a marking function is adopted, and the bolt or nut at the position where the error occurs is marked to make a tightening error. Make it possible to identify the location of occurrence.
FIG. 16 shows an example of a display screen 4a of a tablet terminal 4 or the like when the order in which tightening operations are performed and the position where a tightening error occurs are monitored by camera photography. On the display screen 4a, the intersection of the grids is the position of the bolt and the nut (through hole), and the position marked with a circle is the position where the tightening work is performed. The numbers diagonally above indicate the order of tightening work. The position marked with a black circle among the circles is the position where the error occurs. That is, in the example shown in FIG. 16, an error occurs at the 8th and 13th tightening operations.
The example shown in FIG. 16 can also be applied to the case where the above-mentioned ranging unit 56 is used.

Further, FIG. 17 shows an example of a display screen 4b of a tablet terminal 4 or the like when a number is assigned in advance. On the display screen 4b, the positions of bolts and nuts (through holes) are numbered in advance, and only the position where the error occurs is monitored, so that the position where the error occurs can be easily located on the display screen of the tablet terminal 4 or the like. I am trying to identify it. In order to detect that an error has occurred, a signal emitted when the above-mentioned notification means (notifying that the tightening condition is not satisfied) in the nut runner 2 is operated may be transmitted to the controller 1. On the display screen 4b of the tablet terminal 4 or the like, the received signal at the time of operation of the notification means and the position information (order) of the nut runner 2 may be linked and managed and displayed. The numbers given in advance may be in the order in which the bolts and nuts are tightened. In the example shown in FIG. 17, an error occurs at the position where the tightening work is performed at the 45th and 63rd positions.
The example shown in FIG. 17 can be applied not only when the above-mentioned ranging unit 56 is used, but also when a camera image is taken and a marking socket is used.
For error detection, the worker may confirm the notification by the notification means of the nut runner 2 and allow the worker to transmit the error information from the communication terminal owned by the worker to the controller 1 or the tablet terminal 4. ..

The guide mechanism 50 in this modification can move the nut runner 2 held by the holding portion 53 along the upper surface of the upper flange 21 of the bridge girder BG. As a result, the tightening work of the bolts and nuts provided on the second splicing plate 23 on the upper surface of the upper flange 21 can be performed while being guided by the guide mechanism 50.

According to this modification as described above, the nut runner 2 can be easily moved in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, so that the nut tightening work can be performed. It is possible to reduce the burden on the worker who performs the work.
Further, since the guide mechanism 50 is detachable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.

Although the guide mechanism 50 in this modification is provided on the upper surface side of the bridge girder BG, it may be provided on the lower surface side. When the guide mechanism 50 is provided on the lower surface side of the bridge girder BG, the urging portion 54 may be a constant load spring, or another urging such as a coil spring for urging the nut runner 2 upward. It may be a means. The mounting position of the urging portion 54 may also be changed as appropriate. That is, when the guide mechanism 50 is provided on the lower surface side of the bridge girder BG, it is necessary to perform the tightening work by the nut runner 2 upward, so that the urging portion is in a position where it is easy to support when performing the upward tightening work. 54 is provided.

[Modification 4]
As shown in FIGS. 18A and 18B, the nut runner 2 for tightening the bolts and nuts in this modification is provided in the vertical direction (bridge girder BG) by the guide mechanism 60 provided on the upper surface side of the bridge girder BG. It is held so that it can be slidably moved in the lateral direction (the width direction of the bridge girder BG) and the lateral direction (the direction along the length direction of the bridge girder BG).
In this modification, the bridge girder BG is a box girder, and the brace material 25 is provided vertically and horizontally between a plurality of bridge girder BGs arranged at intervals from each other. .. Each brace material 25 is fixed to the gusset plate 26 fixed to the bridge girder BG with bolts and nuts, and the tightening work of the bolts and nuts is performed by the nut runner 2 slidably held by the guide mechanism 60. Will be done. Further, it is needless to say that the bolts and nuts are tightened by the nut runner 2 when the bridge girders BGs are connected to each other in the length direction as in the above-described embodiment and each modification.

The guide mechanism 60 of this modification is a guide device 60 that holds the nut runner 2 and guides the movement in the vertical direction and the horizontal direction, and includes a movable mast 61, a bending type rotating arm 62, a rope 63, and the like. It is provided with an urging unit 64. Although not shown, it is assumed that the held portion 2a of the nut runner 2 is provided with the above-mentioned positioning portion (cross laser marker).

The movable mast 61 has a mast main body 61a, a traveling portion 61b, a rail 61c, and a plurality of receiving beams 61d.
The mast body 61a is formed in a columnar shape.
The traveling portion 61b, the rail 61c, and the plurality of receiving beams 61d function as a movable mechanism for moving the mast body 61a in the vertical direction and the horizontal direction.
That is, the plurality of receiving beams 61d are arranged on the upper surface of one of the bridge girders BG at intervals and in a direction orthogonal to the length direction of the bridge girder BG. These plurality of receiving beams 61d are detachably attached to the bridge girder BG by, for example, a fastener such as Bullman. Therefore, the positions of the plurality of receiving beams 61d can be easily moved. In this modification, the plurality of receiving beams 61d (and thus the guide mechanism 60) are provided on the upper surface of one bridge girder BG, but may be provided on the upper surface of the other bridge girder BG. It may be provided on the upper surface of both bridge girders BG, respectively.
The rail 61c is bridged between the plurality of receiving beams 61d, and is detachably attached to the plurality of receiving beams 61d by, for example, a fastener such as a Bullman. Therefore, the position of the rail 61c can be easily moved, and the mast body 61a can be arranged on one side edge of the bridge girder BG, or the mast body 61a can be arranged on the other side edge of the bridge girder BG.
The traveling portion 61b is integrally provided at the lower end portion of the mast main body 61a, is formed in a cylindrical shape, and the rail 61c is passed through the inside of the cylinder. As a result, the traveling portion 61b (that is, the mast main body 61a) can move along the length direction of the rail 61c and within the range of the distance between the plurality of receiving beams 61d. Although not shown, the traveling unit 61b may have an electric traveling roller in contact with the rail 61c, in which case remote control can be performed by a controller.

The bending type rotary arm 62 is an arm whose base end portion is rotatably provided around the axis of the movable mast 61 with respect to the movable mast 61, and is a rotation holding portion 62a, a first arm 62b, and a second arm. It has 62c and.
The rotation holding portion 62a is located at the base end portion of the bending type rotating arm 62, is a portion that holds the upper end portion of the movable mast 61, and can rotate 360 degrees around the axis of the movable mast 61. Further, the rotation holding portion 62a is movable along the length direction of the mast main body 61a in the movable mast 61. Such an operation of the rotation holding portion 62a may be performed by an electric operation using a controller (not shown), or may be performed by a manual operation.
The first arm 62b and the second arm 62c are used as a set and are configured to be horizontally rotatable at the connecting portion between the first arm 62b and the second arm 62c. That is, the base end portion of the first arm 62b is integrally provided with the rotation holding portion 62a, and the second arm 62c is rotatably connected to the tip end portion. The base end portion of the second arm 62c is rotatably connected to the first arm 62b, and a turning sheave 62d for guiding the rope 63 is provided on the upper surface of the tip end portion. The first arm 62b and the second arm 62c, which are rotatably connected to each other, are configured as one arm whose central portion bends in a dogleg shape. That is, the bending type rotary arm 62 rotates the nut runner 2 in a range in which the first arm 62b (rotation holding portion 62a) rotates around the axis of the movable mast 61 and the second arm 62c rotates with respect to the first arm 62b. You can move it within the range you want.
The first arm 62b and the second arm 62c are rotatably connected by a guided rotation shaft 62e. The upper end of the guided rotary shaft 62e is a guide portion through which the rope 63 can be passed.

The base end portion of the rope 63 is connected to a holding portion 64a provided at the tip end portion of the urging portion 64, and the tip end portion is attached to the held portion 2a of the nut runner 2. That is, the nut runner 2 is held by the holding portion 64a of the urging portion 64 through the rope 63. Further, since the rope 63 has a high degree of freedom with respect to the holding portion 64a of the urging portion 64, it is easy to move the nut runner 2.
For the rope 63, for example, a nylon-coated wire is used.

The urging portion 64 is provided on the upper surface of the base end portion of the first arm 62b. Such an urging portion 64 passes through the rope 63 in a direction toward the base end portion of the first arm 62b with respect to the held portion 2a of the nut runner 2 (gravity for the nut runner 2 located at the lower end portion of the rope 63). Gives an urging force that acts in the direction opposite to the direction). This urging force is set so that the nut runner 2 is returned in the direction opposite to the direction of gravity, balanced, or slightly moved in the direction of gravity.
A take-up type constant load spring is used for the urging portion 64 in this modification, and the base end portion of the rope 63 is connected to the holding portion 64a at the tip end portion of the strip-shaped spring.
When the guide mechanism 60 is provided with such an urging portion 64, the nut runner 2 which is a heavy object always moves upward by the urging force of the urging portion 64 and tries to return to the original position. , It is possible to reduce the burden on the worker who tightens the bolts and nuts.

The guide mechanism 60 in this modification can freely move the nut runner 2 held by the urging portion 64 and suspended by the rope 63 within the reach of the rope 63. As a result, the bolt and nut tightening work on the splicing plate when connecting the bridge girder BGs in the length direction and the bolt and nut tightening work when connecting each brace material 25 and the gusset plate 26 can be performed. , It can be performed while guiding by the guide mechanism 60.
The nut runner 2 may be equipped with a reaction force fitting that is in contact with adjacent bolts or nuts, and the reaction force fitting may be brought into contact with the adjacent bolts or nuts to improve the tightening force of the nut runner 2. ..

According to this modification as described above, not only is it easy to move the nut runner 2 in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, but also the bridge girder BG. Since the nut runner 2 can be easily moved according to the positions of the nuts and bolts around the nut, the burden on the worker who performs the nut tightening work can be reduced. Further, since the bending type rotary arm 62 is adopted and is operated around the movable mast 61, the nut runner 2 can be quickly moved by a slight rotation operation by an operator even in a narrow work space.
Further, since the guide mechanism 60 is removable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.

In this modification, the length of the first arm 62b is about 1.3 m, and the length of the second arm 62c is about 1.0 m. The band-shaped spring of the urging portion 64, which is a constant load spring, has an operating distance of about 1.2 m. A length adjusting device (for example, a small chain block) capable of adjusting the length of the rope 63 may be provided at the tip end portion of the rope 63 connected to the urging portion 64. The dimensional settings of the first arm 62b, the second arm 62c, and the urging unit 64 are not limited to the above numerical values, and may be appropriately changed without departing from the spirit of the present invention. Work efficiency can be improved by lengthening the working distance.

The bending rotary arm 620 shown in FIG. 19 is another configuration example of the bending rotary arm 62 described above. In this modified example, the bending rotary arm 62 is replaced with the bending rotary arm 62 shown in FIG. An arm 620 can be used.
In the bending type rotary arm 620 of FIG. 19, the second arm 622 is connected to the first arm 621 so as to be expandable and contractible. More specifically, the first arm 621 is formed in a cylindrical shape, and the second arm 622 is inserted into the cylinder of the first arm 621 and expands and contracts along the length direction of the first arm 621. .. Along with this, the length (operating distance) of the strip-shaped spring in the urging portion 64 is also set long, which can contribute to the improvement of work efficiency.
Further, the second arm 622 has a first portion 622a on the side inserted into the cylinder of the first arm 621 and a second portion 622b on the tip end side, and the first portion 622a and the second portion 622a. It is configured to be horizontally rotatable at the connecting portion of the portion 622b. That is, the base end portion of the first portion 622a is inserted into the cylinder of the first arm 621, and the second portion 622b is rotatably connected to the tip end portion. The base end portion of the second portion 622b is rotatably connected to the first portion 622a, and a turning sheave 62d for guiding the rope 63 is provided on the upper surface of the tip portion. The first portion 622a and the second portion 622b, which are rotatably connected to each other, are configured as one arm (second arm 622) whose central portion bends in a dogleg shape. The first portion 622a and the second portion 622b are rotatably connected by a guided rotation shaft 62e. The upper end of the guided rotary shaft 62e is a guide portion through which the rope 63 can be passed.
According to such a bending type rotary arm 620, the second arm 621 expands and contracts with respect to the first arm 621 and is configured to be horizontally rotatable, which contributes to the expansion of a flat work range. be able to.

[Modification 5]
As shown in FIGS. 20 (a) and 20 (b), the nut runner 2 for tightening the bolts and nuts in this modification is provided in the vertical direction (bridge girder BG) by the guide mechanism 70 provided on the upper surface side of the bridge girder BG. It is held so that it can be slidably moved in the lateral direction (the width direction of the bridge girder BG) and the lateral direction (the direction along the length direction of the bridge girder BG).
In this modification, the bridge girder BG is a box girder, and the brace material 25 is provided vertically and horizontally between a plurality of bridge girder BGs arranged at intervals from each other. .. Each brace material 25 is fixed to the gusset plate 26 fixed to the bridge girder BG with bolts and nuts, and the tightening work of the bolts and nuts is performed by the nut runner 2 slidably held by the guide mechanism 60. Will be done. Further, it is needless to say that the bolts and nuts are tightened by the nut runner 2 when the bridge girders BGs are connected to each other in the length direction as in the above-described embodiment and each modification.

The guide mechanism 70 of this modification is a guide device 70 that holds the nut runner 2 and guides the movement in the vertical direction and the horizontal direction, and is a movable mast 71, a rotating arm 72, a rope 73, and an urging. A unit 74 is provided. Although not shown, it is assumed that the held portion 2a of the nut runner 2 is provided with the above-mentioned positioning portion (cross laser marker).

The movable mast 71 has a mast main body 71a, a traveling portion 71b, a rail 71c, and a plurality of receiving beams 71d.
The mast body 71a is formed in a columnar shape.
The traveling portion 71b, the rail 71c, and the plurality of receiving beams 71d function as a movable mechanism for moving the mast body 71a in the vertical direction and the horizontal direction.
That is, the plurality of receiving beams 71d are bridged between the upper surface of one bridge girder BG and the upper surface of the other bridge girder BG, and are arranged at intervals from each other. These plurality of receiving beams 71d are detachably attached to both bridge girders BG by, for example, a fastener such as Bullman. Therefore, the positions of the plurality of receiving beams 71d can be easily moved.
The rail 71c is bridged between the plurality of receiving beams 71d, and is detachably attached to the plurality of receiving beams 71d by, for example, a fastener such as a Bullman. Therefore, the position of the rail 71c can be easily moved (traverse), and the mast main body 71a can be arranged on one bridge girder BG side or the mast main body 71a can be arranged on the other bridge girder BG side. That is, the movable range of the movable mast 71 is set wide.
The traveling portion 71b is integrally provided at the lower end portion of the mast main body 71a, is formed in a cylindrical shape, and the rail 71c is passed through the inside of the cylinder. As a result, the traveling portion 71b (that is, the mast main body 71a) can move along the length direction of the rail 71c and within the range of the distance between the plurality of receiving beams 71d. Although not shown, the traveling unit 71b may have an electric traveling roller in contact with the rail 71c, in which case remote control can be performed by the controller.

The rotary arm 72 is an arm whose base end portion is rotatably provided around the axis of the movable mast 71 with respect to the movable mast 71, and has a rotation holding portion 72a and an arm main body 72b.
The rotation holding portion 72a is located at the base end portion of the rotating arm 72 (arm body 72b) and is a portion that holds the upper end portion of the movable mast 71, and can rotate 360 degrees around the axis of the movable mast 71. .. Further, the rotation holding portion 72a is movable along the length direction of the mast main body 71a in the movable mast 71. Such an operation of the rotation holding portion 72a may be performed by an electric operation using a controller (not shown), or may be performed by a manual operation.
The arm body 72b is provided with a base end portion integrally provided with the rotation holding portion 72a, and a turning sheave 72d for guiding the rope 73 is provided on the upper surface of the tip end portion.
The rotary arm 62 can move the nut runner 2 within a range in which the arm body 72b (rotation holding portion 72a) rotates around the axis of the movable mast 71.

The base end portion of the rope 73 is connected to the holding portion 74a provided at the tip end portion of the urging portion 74, and the tip end portion is attached to the held portion 2a of the nut runner 2. That is, the nut runner 2 is held by the holding portion 74a of the urging portion 74 through the rope 73. Further, since the rope 73 has a high degree of freedom with respect to the holding portion 74a of the urging portion 74, the nut runner 2 can be easily moved.
For the rope 73, for example, a nylon-coated wire is used.

The urging portion 74 is provided on the upper surface of the base end portion of the arm main body 72b. Such an urging portion 74 passes through the rope 73 in a direction toward the base end portion of the first arm 72b with respect to the held portion 2a of the nut runner 2 (gravity for the nut runner 2 located at the lower end portion of the rope 73). Gives an urging force that acts in the direction opposite to the direction). This urging force is set so that the nut runner 2 is returned in the direction opposite to the direction of gravity, balanced, or slightly moved in the direction of gravity.
A take-up type constant load spring is used for the urging portion 74 in this modification, and the base end portion of the rope 73 is connected to the holding portion 74a at the tip end portion of the strip-shaped spring.
When the guide mechanism 70 is provided with such an urging portion 74, the nut runner 2, which is a heavy object, always moves upward by the urging force of the urging portion 74 and tries to return to the original position. , It is possible to reduce the burden on the worker who tightens the bolts and nuts.

The guide mechanism 70 in this modification can freely move the nut runner 2 held by the urging portion 74 and suspended by the rope 73 within the reach of the rope 73. As a result, the bolt and nut tightening work on the splicing plate when connecting the bridge girder BGs in the length direction and the bolt and nut tightening work when connecting each brace material 25 and the gusset plate 26 can be performed. , It can be performed while guiding by the guide mechanism 70.
The nut runner 2 may be equipped with a reaction force fitting that is in contact with adjacent bolts or nuts, and the reaction force fitting may be brought into contact with the adjacent bolts or nuts to improve the tightening force of the nut runner 2. ..

According to this modification as described above, not only is it easy to move the nut runner 2 in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, but also the bridge girder BG. Since the nut runner 2 can be easily moved according to the positions of the nuts and bolts around the nut, the burden on the worker who performs the nut tightening work can be reduced. Further, since the rotary arm 72 is adopted and the movable mast 71 is operated as the center, the nut runner 2 can be quickly moved by a slight rotation operation by the worker even in a narrow work space.
Further, since the guide mechanism 70 is removable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.
Further, the rotary arm 72 of this modification is not a type that has a first arm and a second arm as a set and bends, but is composed of one arm main body 72b, so that it has a simple configuration. , It is advantageous in terms of cost and operability. In other words, the working range is limited compared to the type that has the first arm and the second arm as a set and bends, but in this modification, the movable range of the movable mast 71 is set wider. Therefore, it is possible to supplement the working range of the rotary arm 72.

By extending the length of the arm body 72b to about 1.8 m and extending the expansion / contraction amount of the band-shaped spring in the urging portion 74 to 1.6 m, there is an effect of increasing the vertical movement amount of the nut runner 2.
Further, instead of the above-mentioned rotating arm 72, the bending type rotating arm 62 shown in FIG. 18 or the bending type rotating arm 620 shown in FIG. 19 may be used.

[Modification 6]
As shown in FIGS. 21 (a) and 21 (b), the nut runner 2 for tightening the bolts and nuts in this modification is provided in the vertical direction (bridge girder BG) by the guide mechanism 80 provided on the upper surface side of the bridge girder BG. It is held so that it can be slidably moved in the lateral direction (the width direction of the bridge girder BG) and the lateral direction (the direction along the length direction of the bridge girder BG).
In this modification, the bridge girder BG is a box girder, and the brace material 25 is provided vertically and horizontally between a plurality of bridge girder BGs arranged at intervals from each other. .. Each brace material 25 is fixed to the gusset plate 26 fixed to the bridge girder BG with bolts and nuts, and the tightening work of the bolts and nuts is performed by the nut runner 2 slidably held by the guide mechanism 80. Will be done. Further, it is needless to say that the bolts and nuts are tightened by the nut runner 2 when the bridge girders BGs are connected to each other in the length direction as in the above-described embodiment and each modification.

The guide mechanism 80 of this modification is a guide device 80 that holds the nut runner 2 and guides the movement in the vertical direction and the horizontal direction, and is a movable mast 81, a rotary arm 82, a rope 83, and an urging. A unit 84, a moving wire 85, and a communication unit 86 are provided. Although not shown, it is assumed that the held portion 2a of the nut runner 2 is provided with the above-mentioned positioning portion (cross laser marker).

First, the moving wire 85 is provided at a position above the upper surface of the bridge girder BG so as to be stretched along the length direction of the bridge girder BG. More specifically, a plurality of wire holding portions 85a are arranged above both bridge girders BG at intervals in the length direction of both bridge girders BG, and move between these plurality of wire holding portions 85a. Wire 85 is hung. In this modification, the two moving wires 85 are arranged in a positional relationship that fits between one bridge girder BG and the other bridge girder BG in a plan view, but one bridge girder BG and the other bridge girder BG are arranged. It may be arranged outside the bridge girder BG.
It is assumed that the plurality of wire holding portions 85a are installed on scaffolding, guard fences, etc. (not shown), and are not installed on the bridge girder BG. Further, the space between the plurality of wire holding portions 85a is a short span of 10 to 15 m, which makes it difficult to bend.
The distance between the moving wires 85 can be appropriately changed according to the site conditions.

The movable mast 81 has a mast main body 81a, a traveling portion 81b, and a moving frame 81c, and is movable along the moving wire 85.
The mast body 81a is formed in a columnar shape and extends from the upper side to the lower side.
The traveling portion 81b and the moving frame 81c function as a movable mechanism for moving the mast body 81a in the vertical direction and the horizontal direction.
That is, the moving frame 81c is formed at both ends in the length direction of the plurality of first frame members 81d bridged between one moving wire 85 and the other moving wire 85, and the plurality of first frame members 81d. A plurality of second frame materials 81e integrally provided on the lower surface side are provided. The plurality of second frame members 81e are arranged so as to be bridged between the plurality of first frame members 81d and to sandwich the moving wire 85 in between. That is, the plurality of second frame materials 81e function as a guide and a steady rest when the moving frame 81c moves along the moving wire 85. The moving frame 81c shall be moved manually, and may be temporarily fixed by a wire clip or the like during the tightening work by the nut runner 2.
The traveling portion 81b is integrally provided at the upper end portion of the mast main body 81a, and includes traveling rollers traveling on a plurality of first frame members 81d in the moving frame 81c. As a result, the traveling portion 81b (that is, the mast main body 81a) can move along the length direction of the plurality of first frame members 81d. Although not shown, the traveling roller in the traveling unit 81b may be manually operated or may be remotely controlled by a controller.

The telescopic rotary arm 82 is an arm whose base end portion is rotatably provided around the axis of the movable mast 81 with respect to the movable mast 81, and is a rotation holding portion 82a, a first arm 82b, and a second arm. It has 82c and.
The rotation holding portion 82a is located at the base end portion of the telescopic rotary arm 82 and is a portion for holding the upper end portion of the movable mast 81, and can rotate 360 degrees around the axis of the movable mast 81. Further, the rotation holding portion 82a is movable along the length direction of the mast main body 81a in the movable mast 81. Such an operation of the rotation holding portion 82a may be performed by an electric operation using a controller (not shown), or may be performed by a manual operation.
The first arm 82b and the second arm 82c are used as a set, and the second arm 82c is stretchably connected to the first arm 82b. More specifically, the first arm 82b is formed in a cylindrical shape, and the second arm 82c is inserted into the cylinder of the first arm 82b and expands and contracts along the length direction of the first arm 82b. .. That is, the base end portion of the first arm 82b is integrally provided with the rotation holding portion 82a, and the second arm 82c is stretchably connected to the tip end portion. The base end portion of the second arm 82c is stretchably connected to the first arm 82b, and a turning sheave 82d for guiding the rope 83 is provided on the upper surface of the tip end portion.

The base end portion of the rope 83 is connected to the holding portion 84a provided at the tip end portion of the urging portion 84, and the tip end portion is attached to the held portion 2a of the nut runner 2. That is, the nut runner 2 is held by the holding portion 84a of the urging portion 84 through the rope 83. Further, since the rope 83 has a high degree of freedom with respect to the holding portion 84a of the urging portion 84, it is easy to move the nut runner 2.
For the rope 83, for example, a nylon-coated wire is used.

The urging portion 84 is provided on the upper surface of the base end portion of the first arm 82b. Such an urging portion 84 passes through the rope 83 in a direction toward the base end portion of the first arm 82b with respect to the held portion 2a of the nut runner 2 (gravity for the nut runner 2 located at the lower end portion of the rope 83). Gives an urging force that acts in the direction opposite to the direction). This urging force is set so that the nut runner 2 is returned in the direction opposite to the direction of gravity, balanced, or slightly moved in the direction of gravity.
A take-up type constant load spring is used for the urging portion 84 in this modification, and the base end portion of the rope 83 is connected to the holding portion 84a at the tip end portion of the strip-shaped spring.
When the guide mechanism 80 is provided with such an urging portion 84, the nut runner 2, which is a heavy object, always moves upward by the urging force of the urging portion 84 and tries to return to the original position. , It is possible to reduce the burden on the worker who tightens the bolts and nuts.

The communication unit 86 is a communication module, which is provided in the traveling unit 81b and operates by receiving a signal from an external controller, or receives data from the nut runner 2 and transmits the data to the server device 5. can do.

The guide mechanism 80 in this modification can freely move the nut runner 2 held by the urging portion 84 and suspended by the rope 83 within the reach of the rope 83. As a result, the bolt and nut tightening work on the splicing plate when connecting the bridge girder BGs in the length direction and the bolt and nut tightening work when connecting each brace material 25 and the gusset plate 26 can be performed. , It can be performed while guiding with the guide mechanism 80.
The nut runner 2 may be equipped with a reaction force fitting that is in contact with adjacent bolts or nuts, and the reaction force fitting may be brought into contact with the adjacent bolts or nuts to improve the tightening force of the nut runner 2. ..

According to this modification as described above, not only is it easy to move the nut runner 2 in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, but also the bridge girder BG. Since the nut runner 2 can be easily moved according to the positions of the nuts and bolts around the nut, the burden on the worker who performs the nut tightening work can be reduced. Further, since the telescopic rotary arm 82 is adopted and is operated around the movable mast 81, the nut runner 2 can be quickly moved by a slight rotation operation by the worker even in a narrow work space.
Further, since the guide mechanism 80 is detachable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period. Further, since the guide mechanism 80 of this modification does not need to be installed on the bridge girder BG itself, it is possible to reduce or simplify the equipment for the guide mechanism 80.
Further, the installation interval between the plurality of moving wires 85 and the installation interval between the plurality of wire holding portions 85a (the length of the moving wires 85) can be flexibly adjusted according to the bridge type and the cross-sectional dimension, so that the guide can be used. The mechanism 80 can be easily installed.

[Modification 7]
As shown in FIGS. 22 (a) and 22 (b), the nut runner 2 for tightening the bolts and nuts in this modification is inside the joint portion where the end portions of the bridge girder BG in the length direction are joined to each other. It is held so as to be slidable in the vertical direction (direction along the length direction of the bridge girder BG) and the horizontal direction (width direction of the bridge girder BG) by the provided guide mechanism 90.
In this modification, the bridge girder BG is a box girder, and inside the bridge girder BG, a plurality of ribs 27 arranged along the length direction of the bridge girder BG are integrally formed on the top surface and the bottom surface. There is. Then, by connecting the rib 27 in one bridge girder BG in the length direction and the rib 27 in the other bridge girder BG in the length direction, the bridge girders BG can be connected to each other. The ribs 27 can be connected to each other by tightening the bolts and nuts via the connecting plate CP straddling both side surfaces of the ribs 27.

The guide mechanism 90 of this modification holds the nut runner 2 and moves in the vertical and horizontal directions when the bolt and the nut are tightened by the nut runner 2 inside the bridge girder BG which is a box girder. The guide device 90 is provided with a movable support frame 91 and a bending type rotary arm 92. Although not shown, it is assumed that the held portion 2a of the nut runner 2 is provided with the above-mentioned positioning portion (cross laser marker).
In FIG. 22, the nut runner 2 is shown roughly.

The movable support frame 91 includes an upper support beam 91a, a lower support beam 91b, a vertical connection frame 91c, and a slide frame 91d.
The upper support beam 91a and the lower support beam 91b are provided so as to be bridged between the left and right side walls of the bridge girder BG, which is a box girder, and are arranged at intervals in the vertical direction. The upper and lower connecting frames 91c are bridged between both ends of the upper support beam 91a and the lower support beam 91b in the length direction to connect the upper support beam 91a and the lower support beam 91b.
The slide frame 91d is bridged between the upper support beam 91a and the lower support beam 91b, and is provided on the upper support beam 91a and the lower support beam 91b via the slider 91a. As a result, the slide frame 91d can slide and move along the length direction of the upper support beam 91a and the lower support beam 91b. In this modification, two slide frames 91d are provided with a space between the left and right sides, and a bending type rotary arm 92 is held between the two slide frames 91d.

The bending type rotary arm 92 includes a cylindrical first arm 92a held between two slide frames 91d, a second arm 92b telescopically connected to the first arm 92a, and the second arm. It has a third arm 92c, which is rotatably connected to the tip of the 92b. The nut runner 2 is held by the tip end portion 92d of the third arm 92c.
The first arm 92a is provided between the two slide frames 91d via a slider (not shown), and is slidable with respect to the two slide frames 91d. Further, the first arm 92a is arranged along the length direction of the bridge girder BG. The first arm 92a can slide and move along the length direction of the two slide frames 91d and along the length direction of the bridge girder BG.
The second arm 92b is inserted into the cylinder of the first arm 92a formed in a cylindrical shape, and expands and contracts along the length direction of the first arm 92a.
The third arm 92c is configured to be vertically rotatable at the connecting portion with the second arm 92b. That is, the base end portion of the second arm 92b is inserted into the cylinder of the first arm 92a, and the third arm 92c is rotatably connected to the tip end portion. The base end portion of the third arm 92c is rotatably connected to the second arm 92b, and the nut runner 2 is provided on the side surface of the tip end portion 92d. The tip portion 92d of the third arm 92c is configured to be rotatable with respect to the base end portion side of the third arm 92c so that the nut runner 2 can swing.
According to such a bending type rotary arm 92, the first arm 92a slides and moves with respect to the slide frame 91d, the second arm 92b expands and contracts with respect to the first arm 92a, and the third arm 92c becomes the second arm. Since it is configured to be vertically rotatable with respect to 92b and the tip portion 92d of the third arm 92c rotates, it can contribute to the expansion of the working range.

The guide mechanism 90 in this modification can freely move the nut runner 2 within the reach of the bending type rotary arm 92. As a result, the bolt and nut tightening work in the connecting plate CP when the bridge girders BGs are connected in the length direction and the other bolt and nut tightening work can be performed while being guided by the guide mechanism 90. ..
The nut runner 2 may be equipped with a reaction force fitting that is in contact with adjacent bolts or nuts, and the reaction force fitting may be brought into contact with the adjacent bolts or nuts to improve the tightening force of the nut runner 2. ..

According to this modification as described above, not only is it easy to move the nut runner 2 in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, but also the bridge girder BG. Since the nut runner 2 can be easily moved according to the positions of the nuts and bolts around the nut, the burden on the worker who performs the nut tightening work can be reduced. Further, since the bending type rotary arm 92 having a high degree of freedom in the work range is adopted, the nut runner 2 can be quickly moved by a slight rotation operation by the worker even in a narrow work space.
Further, since the guide mechanism 90 is removable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.

[Modification 8]
As shown in FIGS. 23 (a) and 23 (b), the nut runner 2 for tightening the bolts and nuts in this modification is the outer peripheral surface of the joint portion where the end portions of the bridge girder BG in the length direction are joined to each other. The guide mechanism 100 is provided so as to be slidable in the vertical direction (direction along the length direction of the bridge girder BG) and the horizontal direction (width direction of the bridge girder BG).
In this modification, the bridge girder BG is, for example, a box girder having a small cross section constituting the truss girder, and the connecting plate CP is provided on each of the four surfaces (upper surface, lower surface, left and right side surfaces) on the outer peripheral surface of the joint portion. It is provided. The end portions of the bridge girder BG in the length direction can be connected to each other by tightening the bolts and nuts via the connecting plate CP straddling the outer peripheral surface of the joint portion.

The guide mechanism 100 of this modification holds the nut runner 2 and moves in the vertical and horizontal directions when the bolt and the nut are tightened by the nut runner 2 inside the bridge girder BG which is a box girder. The guide device 100 is provided with a support frame 101 and a telescopic arm 102. Although not shown, it is assumed that the held portion 2a of the nut runner 2 is provided with the above-mentioned positioning portion (cross laser marker).
In FIG. 23, the nut runner 2 is shown roughly.

The support frame 101 has an upper support beam 101a, a lower support beam 101b, and a guide rail 101c.
The upper support beam 101a and the lower support beam 101b are arranged so as to be orthogonal to the length direction of the bridge girder BG and to sandwich the bridge girder BG from above and below. It is fastened. Further, both ends of the upper support beam 101a and the lower support beam 101b in the length direction project outward from the left and right side surfaces of the bridge girder BG.
The guide rail 101c is formed in a rectangular frame shape by two rail materials extending vertically and two rail materials extending left and right, and is arranged so as to surround the periphery of the bridge girder BG. Further, the guide rail 101c is connected to both ends of the upper support beam 101a and the lower support beam 101b in the length direction.
The support frame 101 is arranged at a position separated from the joint portion, and the telescopic arm 102 extends from the position toward the joint portion.

The telescopic arm 102 is provided for each of the four rail materials in the guide rail 101c formed in the shape of a rectangular frame, and each telescopic arm 102 slides and moves along the length direction of each rail material. It is possible.
Such a telescopic arm 102 has a cylindrical first arm 102a and a second arm 102b that is stretchably connected to the first arm 102a. The nut runner 2 is held by the tip of the second arm 102c.
The first arm 102a is provided on the rail material of the guide rail 101c via a slider (not shown). Further, the first arm 102a is arranged along the length direction of the bridge girder BG.
The second arm 102b is inserted into the cylinder of the first arm 102a formed in a cylindrical shape, and expands and contracts along the length direction of the first arm 102a. A nut runner 2 is attached to the side surface of the bridge girder BG at the tip of the second arm 102b. The nut runner 2 may be capable of advancing and retreating with respect to the connecting plate CP. Further, the tip end portion of the second arm 102b may be configured to be rotatable with respect to the base end portion side of the second arm 102b so that the nut runner 2 can swing.
According to such a telescopic arm 102, the first arm 102a slides and moves along the guide rail 101c, and the second arm 102b expands and contracts with respect to the first arm 102a, which contributes to the expansion of the working range. Can be done.

The guide mechanism 100 in this modification can freely move the nut runner 2 within the reach of the telescopic arm 102. As a result, the bolt and nut tightening work in the connecting plate CP when the bridge girders BGs are connected in the length direction and the other bolt and nut tightening work can be performed while being guided by the guide mechanism 100. ..
The nut runner 2 may be equipped with a reaction force fitting that is in contact with adjacent bolts or nuts, and the reaction force fitting may be brought into contact with the adjacent bolts or nuts to improve the tightening force of the nut runner 2. ..

According to this modification as described above, not only is it easy to move the nut runner 2 in the vertical and horizontal directions according to the positions of the nuts and bolts (or through holes) arranged in a grid pattern, but also the bridge girder BG. Since the nut runner 2 can be easily moved according to the positions of the nuts and bolts around the nut, the burden on the worker who performs the nut tightening work can be reduced.
Further, since the guide rail 101c arranged so as to surround the circumference of the bridge girder BG is adopted, the nut runner 2 is evenly moved over the outer peripheral surface of the joint portion where the lengthwise end portions of the bridge girder BG are mated with each other. be able to.
Further, since the guide mechanism 90 is removable from the bridge girder BG, it can be immediately carried to the next work place and moved, which can contribute to shortening the overall construction period.

Although the guide rail 101c in this modification is formed in a rectangular frame shape, the guide rail 101c is not limited to this, and may be formed in an annular shape, for example. In this case, since the nut runner 2 can be moved in the circumferential direction, the number of nut runners 2 used can be reduced as much as possible.

100 Bolt tightening management system 1 Controller 11 Control unit 12 Storage unit 121 Work history table 13 Operation unit 14 Display unit 15 Communication unit 16 Timekeeping unit 2 Nut runner 3 Bar code reader 4 Tablet terminal 5 Server device 6 Guide mechanism BC Bar code

Claims (1)

A semi-circular head type high-strength bolt that is tightened by a tightening tool in construction work.
Bolt body without pintail and
Equipped with a semi-circular head that is sandwiched by jigs,
The head is a semi-circular head type high-strength bolt characterized by having a pair of jig sandwiching portions which are parallel cut surfaces formed by a cutting process.

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