JP7785424B2 - Waterproof sheet seam welding management device and management method - Google Patents

Description

The present invention relates to a construction management device and method for waterproofing sheets installed in structures to be waterproofed, such as tunnels, and in particular to a device and method for managing the welding of seams between adjacent waterproofing sheets.

For example, in mountain tunnels, waterproofing work consisting of multiple waterproof sheets is applied to the back of the lining. Each waterproof sheet is stretched with its longitudinal direction aligned with the circumferential direction of the upper arch of the tunnel and its transverse direction aligned with the tunnel axis. Multiple waterproof sheets are lined up in the tunnel axis direction. The joints between the opposing ends of adjacent waterproof sheets are welded together using a welding machine (see Patent Document 1, etc.).
The reference temperature (target temperature) for welding is set in advance before construction. The reference temperature is set according to the outside air temperature, for example, about 360°C in summer and about 380°C in winter. The setting is done manually by the worker.

Japanese Patent Application Laid-Open No. 2016-113801 Japanese Patent Application Laid-Open No. 2021-096101

Poor welding can occur when processing waterproofing sheet seams. Possible causes include human error, such as improper welding machine placement or incorrect temperature settings, as well as malfunctions of the welding machine, such as the actual welding temperature (output temperature) not reaching the standard temperature. However, since the welding temperature of a welding machine is generally considered to be controlled to the standard temperature, and actual welding temperature data is not available, it is unclear whether poor construction is due to malfunction of the welding machine. Furthermore, checking for poor welding requires visual inspection of the entire length of the seam and pressure leak tests, which is cumbersome.
In view of the above circumstances, the present invention aims to make it possible to verify whether poor welding at the seams of a waterproof sheet is caused by a malfunction of the welding machine, and to make it easy to identify the location of the poor welding caused by the malfunction.

In order to solve the above problems, the present invention provides a waterproof sheet welding management device that manages the welding state of the seams of a waterproof sheet stretched over a waterproof structure by a welding machine, and
an output acquisition unit that acquires output information over time, including a welding temperature of the welding machine while the welding machine is moving along the seam;
a storage unit that stores the output information;
and a creation unit that creates display data representing the welding temperature at each position corresponding value of the seam of the waterproof sheet from the stored output information.
This makes it possible to verify the relationship between the welding machine output and the welding condition by checking the displayed data, making it easier to find areas of poor welding caused by welding temperature.

Each of the position-corresponding values may be an elapsed time from the start of welding. Preferably, the creating unit creates display data showing the welding temperature versus the elapsed time.
Normally, the welding machine moves along the seam at a constant speed during welding. Therefore, the elapsed time from the start of welding is roughly proportional to the distance the welding machine has moved since the start of welding, and can serve as information indicating the position of the welding machine. Therefore, the welding temperature at each position along the seam can be confirmed from the display data showing the welding temperature versus the elapsed time.

It is preferable that the welding management device further includes a position estimation unit that estimates the position of the welding machine at the time of acquisition from the length from the welding start position to the welding end position of the seam, the time from the welding start position to the welding end position, and the elapsed time from the welding start position to the output information acquisition position.
It is preferable that the creating unit creates the display data using the estimated positions as the position corresponding values, thereby making it possible to directly display the relationship between each position of the seam and the welding temperature.
The length of the seam from the welding start position to the welding end position is known or measurable. The time from the welding start position to the welding end position is acquired by the output acquisition unit as part of the output information. The ratio of the distance traveled by the welder from the welding start position to the length from the welding start position to the welding end position at the time of acquisition is equal to the ratio of the elapsed time from the welding start position to the time of acquisition to the time from the welding start to the welding end position. Therefore, the distance traveled by the welder at the time of acquisition, and therefore the position of the welder at the time of acquisition, can be calculated from the length from the welding start position to the welding end position, the time from the welding start to the welding end position, and the elapsed time from the welding start to the time of acquisition. This provides display data of the welding temperature at each position of the seam.

the output acquisition unit includes a temperature acquisition unit that acquires the welding temperature and a speed acquisition unit that acquires speed information of the welding machine,
a position estimation unit that estimates a position of the welding machine at the time of acquiring the output information from the speed information,
It is preferable that the creation unit creates the display data using the estimated positions as the position correspondence values.
For example, the position of the welding machine at a certain time (the distance traveled from the welding start position) can be determined from the product of the speed information and the elapsed time from the start of welding, or from the time integral of the speed information.

It is preferable that the welding management device further includes an outside air thermometer that measures the outside air temperature, and a temperature setting means that automatically sets the reference welding temperature for the welding machine based on the measurement value of the outside air thermometer. This avoids human input errors in the reference welding temperature according to the outside air temperature.

It is preferable that the welding management device further includes an alarm means for issuing an alarm when the temperature difference between the welding reference temperature in the welding machine and the welding temperature exceeds a predetermined value. This can alert workers during welding operations to the possibility of welding defects caused by the welding machine.

The method of the present invention is a method for managing the welding state of a seam of a waterproof sheet stretched over a waterproof structure by a welding machine, comprising the steps of:
welding the seam with the welding machine while moving the welding machine along the seam;
a step of acquiring output information including a welding temperature of the welding machine over time during the welding;
storing the output information in a storage unit;
and a step of creating display data representing the welding temperature at each position corresponding value of the seam of the waterproof sheet from the stored output information.
The display data allows verification of the relationship between the output of the welding machine and the state of work, and allows management of the quality of the welding work.

It is preferable that each of the position correspondence values is an elapsed time from the start of welding, and that the creating step creates display data that indicates the welding temperature relative to the elapsed time.
The position of the welding machine can be estimated from the elapsed time, and the welding temperature at each position of the seam can be confirmed from the display data showing the welding temperature versus the elapsed time.

a position of the welding machine at the time of acquisition is estimated from a length from a welding start position to a welding end position of the seam, a time from the welding start position to the welding end position, and an elapsed time from the welding start position to the acquisition of the output information;
It is preferable to create the display data using the estimated positions as the position correspondence values.
This provides display data of the welding temperature at each position of the joint, making it easier to verify the relationship between welding defects and welding temperatures.

acquiring speed information of the welding machine as the output information, and estimating the position of the welding machine at the time of acquiring the output information from the speed information;
It is preferable to create the display data using the estimated position as each of the position correspondence values, thereby enabling the position of the welder to be accurately estimated even if the speed of the welder fluctuates.

It is preferable to correct the estimated position based on the calculated travel distance of the welding machine from the start to the end of welding, which is based on the speed information, and the actual distance from the welding start position to the welding end position. This makes it possible to correct errors in the speed information and improve the accuracy of position estimation.

This invention makes it possible to verify whether poor welding at the seams of a waterproof sheet is caused by the actual welding temperature of the welding machine not reaching the reference temperature. Furthermore, it is possible to easily identify the location of the poor welding caused by such malfunction.

FIG. 1 is a perspective view of a tunnel showing the implementation of a waterproof sheet seam welding method using a waterproof sheet seam welding system including a waterproof sheet seam welding management device according to a first embodiment of the present invention. FIG. 2 is a circuit diagram showing a schematic configuration of the waterproof sheet seam welding management system. FIG. 3 is a graph showing an example of display data on the display unit of the management device. FIG. 4 is a graph showing an example of display data according to the second embodiment of the present invention. FIG. 5 is a graph showing an example of display data according to the third embodiment of the present invention. FIG. 6 is a circuit diagram showing a schematic configuration of a waterproof sheet seam welding system including a waterproof sheet seam welding management device according to a fourth embodiment of the present invention. FIG. 7 is a circuit diagram showing a schematic configuration of a waterproof sheet seam welding system including a waterproof sheet seam welding management device according to a fifth embodiment of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First Embodiment (FIGS. 1 to 3)
As shown in Figure 1, in a mountain tunnel 1, a waterproofing work consisting of multiple waterproof sheets 2 is installed between a primary lining 1a and a secondary lining 1b. Each waterproof sheet 2 is stretched with its longitudinal direction aligned with the circumferential direction of the upper half arch of the tunnel 1 and its lateral direction aligned with the tunnel axis. The multiple waterproof sheets 2 are arranged in the tunnel axis direction. The joints 2c between the opposing ends of two adjacent waterproof sheets 2 are welded.

As shown in Figure 1, the welding is performed by a waterproof sheet seam welding system 3. As shown in Figure 2, the waterproof sheet seam welding system 3 includes a welding machine 10 and a waterproof sheet seam welding management device 30. The welding machine 10 includes a welding operation unit 11 and a welding control circuit 20.

As shown in Figure 2, the welding operation unit 11 has a pair of opposing rollers 12 and a heater 13. The pair of rollers 12 pinch and overlap the ends of two waterproof sheets 2 to be welded. Each roller 12 is connected to a motor 14 via a torque transmission mechanism (not shown). Driven by the motor 14, the pair of rollers 12 are driven to rotate synchronously with each other and in opposite directions. This moves the welding machine 10 in the extension direction of the seam 2c along the circumferential direction of the tunnel. The movement speed correlates with the output rotation speed of the motor 14.

A heater 13 is provided immediately in front of (to the right in FIG. 2) the roller 12 in the direction of movement of the welding machine 10 (the direction of the outline arrow in FIG. 2).
The heater 13 may be disposed downstream of the roller 12 .

The heater 13 has a built-in thermocouple 15 (welding thermometer). (In Figure 2, for convenience of illustration, the thermocouple 15 is placed on the outside of the heater 13.) The thermocouple 15 detects the welding temperature caused by the heater 13.

As shown in FIG. 2 , a welding control circuit 20 is connected to the welding operation unit 11. The welding control circuit 20 includes a temperature adjustment unit 21, a speed control unit 22, a heater drive unit 23, and a motor drive unit 24. The input terminal of the temperature adjustment unit 21 is connected to the detection temperature feedback line 15c of the thermocouple 15. The temperature adjustment unit 21 is provided with a temperature setting unit 25. The temperature setting unit 25 sets a reference temperature (target temperature) for welding by the heater 13. The temperature setting unit 25 is configured with a touch panel monitor, but may also be configured with a dial, temperature increase/decrease button, or other knob. The heater drive unit 23 is connected to one of the output terminals of the temperature adjustment unit 21. The heater drive unit 23 is provided as an annex to the heater 13 and turns the heater 13 on and off or increases/decreases its output.
The temperature adjusting unit 21 operates the heater driving unit 23 based on the temperature detected by the thermocouple 15, thereby performing feedback control so that the output temperature (welding temperature) of the heater 13 becomes the reference temperature.

The speed control unit 22 is provided with a speed setting unit 26. The speed setting unit 26 sets the rotation speed of the roller 12 and, therefore, the movement speed of the welding machine 10. The speed setting unit 26 is configured as a dial, but may also be configured as other knobs such as speed increase/decrease buttons or a touch panel monitor.

A motor driving unit 24 is connected to the output terminal of the speed control unit 22. The speed control unit 22 controls the motor driving unit 24 so that the motor output corresponds to the speed set by the speed setting unit 26.
The motor driving unit 24 is provided as an attachment to the motor 14 and drives the motor 14 under the control of the speed control unit 22 .

As shown in Figure 2, a waterproof sheet seam welding management device 30 is connected to the welding machine 10. The waterproof sheet seam welding management device 30 includes a management unit 39 and a processing unit 40. The management unit 39 includes a CPU 31, a power supply circuit 32, a signal conversion unit 33, a memory unit 35, an alarm buzzer 37, and a communication unit 36.

The temperature signal conversion unit 33 is connected to one of the output terminals of the temperature adjustment unit 21.

The signal conversion unit 33 is connected to the CPU 31. The CPU 31 performs predetermined processing to manage the welding condition of the seam 2c of the waterproof sheet 2 based on a predetermined program. The memory unit 35 and alarm buzzer 37 are connected to the CPU 31. The memory unit 35 stores the program, setting data, etc.

Furthermore, the computer 40 is connected wirelessly or via a wire to the CPU 31 via the communication unit 36. The communication unit 36 may include a public communication network such as the Internet. The computer 40 is configured as a smartphone, but is not limited to this and may also be configured as a tablet, laptop, desktop computer, cloud computing, etc. The computer 40 includes a CPU 41, a memory unit 45, and a display 46 (display unit).

The welding condition of the seam 2c of the waterproof sheet 2 is managed by the management device 30 as follows.
<Welding process>
During welding, the heater 13 of the welding machine 10 is operated and the pair of rollers 12 are rotated synchronously. As a result, the ends of the two waterproof sheets 2 that make up the seam 2c to be welded are heated and then introduced between the pair of rollers 12 and welded. At the same time, as shown by the white arc arrow in Figure 1, the welding machine 10 is moved at a set speed along the circumferential direction of the tunnel arch from one end 2p to the other end 2q of the seam 2c.

<Output information acquisition process>
During the welding process, the output temperature (welding temperature) of the heater 13 is detected continuously or at short intervals by the thermocouple 15. The detection signal of the welding temperature is used for feedback control by the temperature adjustment unit 21 and is output from the temperature adjustment unit 21 to the management device 30. In the management device 30, the detection signal is converted into digital form by the signal conversion unit 33 and input to the CPU 31 as welding temperature information. The CPU 31 stores the received welding temperature information together with the time of reception in the memory unit 35. The welding temperature and time information constitute the output information of the welding machine 10. The CPU 31 functions as a temperature acquisition unit that acquires the welding temperature over time, and also functions as an output acquisition unit that acquires output information over time.

<Memory process>
The output information of the welding machine 10 over time is stored in the memory unit 35 .
Furthermore, the output information is transmitted to the computer 40 via the communication unit 36 and stored in the storage unit 45 as well.

<Monitoring process>
At the same time, the CPU 31 monitors the temperature difference between the acquired welding temperature and a reference welding temperature, which is set and input in advance and stored in the storage unit 35.
When the temperature difference exceeds a certain level, the CPU 31 outputs an alarm command to the alarm buzzer 37, which issues an alarm. This notifies the worker performing the welding operation of a welding abnormality, such as a poor welding caused by the welding machine 10, and urges the worker to take action.
As an alarm means, a light emitter such as a patrol lamp may be used instead of or in addition to the alarm buzzer 37 .

Each time a new waterproof sheet 2 is added in the tunnel axis direction, the joint 2c is welded, and output information from the welding machine 10 is acquired for each joint 2c, which is then stored in memory units 35 and 45. The output information for a given joint 2c may be distinguished from multiple joints 2c spaced apart in the tunnel axis direction based on data on the distance from the tunnel entrance. The output information for a given joint 2c may also be distinguished based on the number of the joint 2c counting from the entrance.

<Creation process>
During or after the welding process, the CPU 41 of the computer 40 reads the output information of the specific seam 2c stored in the memory unit 45 in response to a display command from the manager or worker. Then, display data 47 indicating the welding temperature at each position corresponding value of the specific seam 2c is created from the output information and displayed on the display 46. The CPU 41 constitutes a creation unit that creates the display data 47.
As shown in FIG. 3 , the display data 47 is a graph with the horizontal axis representing the elapsed time from the start of welding and the vertical axis representing the welding temperature. The elapsed time from the start of welding corresponds to each position in the extension direction of the specific seam 2c. That is, during the welding process, the welding machine 10 moves along the seam 2c at a substantially constant speed set by the speed setting unit 26. Therefore, the elapsed time from the start of welding is substantially proportional to the distance _L10 ( FIG. 1 ) traveled by the welding machine from the start of welding, and can serve as information indicating where the welding machine 10 was located on the seam 2c when the output information was acquired. That is, the starting point p on the horizontal axis of the display data 47 corresponds to the welding start position 2p ( FIG. 1 ) of the seam 2c. The midpoint on the horizontal axis of the display data 47 corresponds to the midpoint in the extension direction of the seam 2c. The end point q on the horizontal axis of the display data 47 corresponds to the welding end position 2q ( FIG. 1 ) of the seam 2c. The horizontal axis may represent the time at which the output information was acquired. The time itself can be said to essentially represent the elapsed time from the start of welding.

<Verification process>
The manager or worker can check the welding temperature at each position of the seam 2c from the display data 47 on the display 46. Furthermore, by comparing the display data 47 with the actual welding defects of the seam 2c, it can be verified whether the welding defects are caused by a malfunction of the welding machine 10.

As shown in the graph in Figure 3, the welding temperature (output of the welding machine 10) is usually approximately the same as the reference temperature. If there is an abnormality point a on the graph where the welding temperature deviates significantly from the reference temperature, there is a possibility of poor construction, such as poor welding caused by the welding machine 10, at the position on the seam 2c corresponding to the horizontal axis coordinate ta of the abnormality point a. Therefore, by focusing inspection on the corresponding position, it becomes easier to find poor construction, and the welding status can be managed more efficiently.

Next, another embodiment of the present invention will be described. In the following embodiments, the same components as those already described will be denoted by the same reference numerals in the drawings and the description thereof will be omitted.
Second Embodiment (FIG. 4)
As shown in FIG. 4, in the second embodiment, the horizontal axis of the display data 47B is set to the distance (estimated position) from the welding start position.
In the process of creating the display data 47B, the CPU 41 (see FIG. 2) reads the output information of the specified seam 2c and estimates the position on the seam 2c where the output information was acquired. Specifically, the CPU 41 calculates the distance _L10 from the welding start position 2p to the point where each piece of output information was acquired according to the following equation (1):
L ₁₀ = (L _2c /t _2c )×t ₁₀ (1)
Distance _L10 is a positional correspondence value that indicates a position on the joint 2c. _L2c is the total length _L2c of the joint 2c, i.e., the length from the welding start position 2p to the welding end position 2q. The total length _L2c of the joint 2c is equal to the circumferential length of the tunnel arch, is known, and is stored in advance in the memory unit 45. If it is not known, it is measured in advance and stored in the memory unit 45. _t2c is the time from the start of welding to the end of welding. _t10 is the elapsed time from the start of welding to the acquisition of each welding temperature information.

The CPU 41 creates and displays display data 47B using the distance _L10 obtained by the calculation of equation (1) as the horizontal axis scale. This allows the manager or worker to easily determine which position on the seam 2c the graphed welding temperature data corresponds to. If there is an abnormality point b in the welding temperature on the graph, the horizontal axis coordinate Lb of the abnormality point b can be read to easily determine which position on the seam 2c the abnormality point b corresponds to.

Third Embodiment (FIG. 5)
5, in the third embodiment, the horizontal axis of the display data 47C has two scales. One scale indicates the elapsed time from the start of welding, and the other scale indicates the distance from the welding start position. The elapsed time and the distance are position-corresponding values that indicate the position on the seam 2c.

<Fourth embodiment (FIG. 6)>
As shown in Figure 6, in the waterproof sheet seam welding system 3B according to the fourth embodiment, a control signal converter 34 is provided in the management unit 39 of the waterproof sheet seam welding management device 30. The control signal line from the speed control unit 22 to the motor drive unit 24 branches off and is connected to the control signal converter 34. The control signal converter 34 is connected to the CPU 31.

<Welding speed acquisition process>
When welding the seam 2c, in addition to welding temperature information, speed information of the welding machine 10 is acquired over time as output information.
That is, a control signal is output from speed control unit 22 to motor drive unit 24, which drives motor 14, causing roller 12 to rotate and welding machine 10 to move along seam 2c. At the same time, the control signal from speed control unit 22 is also output to management device 30. In management device 30, the control signal is converted into a digital signal by signal converter 34 and then input to CPU 31. This control signal corresponds to the output of motor 14 and, by extension, the rotational speed of roller 12, and corresponds to real-time speed information of welding machine 20. At this time, CPU 31 functions as a speed acquisition unit that acquires speed information of welding machine 20.

<Position estimation process>
Furthermore, the CPU 31 estimates the position of the welding machine 10 on the joint 2c at each temperature detection time (when output information is acquired) from the acquired speed information of the welding machine 10. That is, the product of the speed information and the elapsed time from the start of welding, or the time integral of the speed information, determines the position information of the welding machine 10 at a certain time t, i.e., the travel distance _L10 of the welding machine 10 from the welding start position. At this time, the CPU 31 functions as a position estimation unit. The welding temperature at each position of the seam 2c is determined by combining the welding temperature information over time and the position information.
The speed set by the speed setting unit 26 may be used as speed information, and the position _L10 of the welding machine 10 may be estimated from the product of the set speed and the elapsed time from the start of welding.

<Correction process>
Preferably, the position information _L10 at each temperature detection time is corrected based on the calculated travel distance L10q of the welder 10 from the welding start position to the welding end position and the actual length _L2c of the seam _2c from the welding start position to the welding end position. Specifically, a correction coefficient α = ( _L2c / _L10q ) is calculated from the calculated travel distance _L10q to the welding end position and the actual length _L2c of the seam 2c. The position information _L10 is multiplied by the correction coefficient α to obtain corrected position information L' ₁₀ = α· _L10 . This corrects errors in the speed measurement of the welder 10 and, in turn, errors in position estimation, thereby improving accuracy. The corrected position information L' ₁₀ is a position-corresponding value that represents a position on the seam 2c.

<Memory process>
The output information and position information of the welding machine 10 over time are stored in the memory unit 35 .
Furthermore, the output information and position information are transmitted to the computer 40 via the communication unit 36 and stored in the storage unit 45 as well.

<Creation process>
During or after the welding operation, the CPU 41 of the computer 40 reads the welding temperature information and position information for a specific seam 2c stored in the memory unit 45 in response to a display command from an administrator or the like, creates display data showing the welding temperature at each position on the seam 2c, and displays it on the display 46. This display data is, for example, a graph similar to that shown in Figure 4, but by taking into account the speed information of the welding machine 10 and making further corrections, highly accurate display data can be obtained. Even if the speed of the welding machine 10 fluctuates, the position of the welding machine 10 can be accurately determined, and the welding temperature at each position on the seam 2c can be accurately displayed.

Fifth Embodiment (FIG. 7)
As shown in Figure 7, a waterproof sheet seam welding system 3C according to the fifth embodiment of the present invention is provided with an outdoor air thermometer 50. The outdoor air temperature is measured by the outdoor air thermometer 50. The measured outdoor air temperature information is converted into digital data by a signal converter 33 and input to a CPU 31. The CPU 31 determines the reference temperature for welding based on the measured outdoor air temperature. For example, when the outdoor air temperature is a temperature equivalent to summer, the reference temperature for welding is set to approximately 360°C. When the outdoor air temperature is a temperature equivalent to winter, the reference temperature for welding is set to 380°C.

Furthermore, the CPU 31 issues a command to the temperature setting unit 25 via the signal conversion unit 33, automatically setting the reference temperature in the temperature setting unit 25. This prevents human input errors in the welding reference temperature.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.
For example, the structure to be waterproofed is not limited to a tunnel, but may also be the bottom of a reservoir, the surface of an industrial waste disposal site, or the like.
The speed information may be acquired as the rotation speed of the roller 12. A rotation speed sensor for the roller 12 may be provided as the speed information acquisition unit.
A speed sensor may be provided in the welding machine 10, and a detection signal from the speed sensor may be used as the speed information.

The present invention can be applied, for example, to waterproofing work in mountain tunnels.

1. Tunnels (structures to be waterproofed)
1a Primary lining 1b Secondary lining 2 Waterproof sheet 2c Joint 3, 3B to 3C Waterproof sheet welding system 10 Welding machine 11 Welding operation unit 12 Roller 13 Heater 14 Motor 15 Thermocouple (welding thermometer)
20 Welding control circuit 21 Temperature adjustment unit 22 Speed control unit 23 Heater driving unit 24 Motor driving unit 25 Temperature setting unit 26 Speed setting unit 30 Welding management device 31 CPU
32 Power supply circuit 33 Temperature signal conversion unit 34 Speed control signal conversion unit 35 Memory unit 36 Communication unit 37 Alarm buzzer 39 Management unit 40 Computer (processing unit)
41 CPU
45 Memory unit 46 Display unit 47 Display data 50 Outside air thermometer

Claims (11)

A device for managing the welding state of the seams of a waterproof sheet stretched over a waterproof structure by a welding machine,
an output acquisition unit that acquires output information over time, including a heater temperature detected by a welding thermometer built into a heater of the welding machine while the welding machine is moving along the seam and welding the seam , from a temperature adjustment unit that performs feedback control to keep the heater at a reference temperature ;
a storage unit that stores the output information;
A waterproof sheet seam welding management device characterized by comprising: a creation unit that creates display data representing the temperature of the heater at each position in the extension direction of the waterproof sheet seam and each position corresponding value from the stored output information. Each of the positional correspondence values is an elapsed time from the start of welding,
2. The waterproof sheet joint welding management device according to claim 1, wherein the creation unit creates display data that indicates the temperature of the heater relative to the elapsed time. a position estimation unit that estimates the position of the welding machine at the time of the welding from the length from the welding start position to the welding end position of the seam, the time from the welding start position to the welding end position, and the elapsed time from the welding start position to the welding end position,
2. The waterproof sheet joint welding management device according to claim 1, wherein the creation unit creates the display data using the estimated positions as the position correspondence values. the output acquisition unit includes a temperature acquisition unit that acquires a temperature of the heater and a speed acquisition unit that acquires speed information of the welding machine,
a position estimation unit that estimates a position of the welding machine at the time of acquiring the output information from the speed information;
Further preparation,
2. The waterproof sheet joint welding management device according to claim 1, wherein the creation unit creates the display data using the estimated positions as the position correspondence values. An outside air thermometer to measure the outside temperature,
a temperature setting means for automatically setting the reference temperature for welding in the welding machine based on the measurement value of the outside air thermometer;
The welding management device according to any one of claims 1 to 4, further comprising: The welding management device according to any one of claims 1 to 5, further comprising an alarm means for issuing an alarm when a temperature difference between the reference temperature for welding in the welding machine and the temperature of the heater becomes equal to or greater than a predetermined value. A method for managing the welding state of a waterproof sheet joint that is stretched over a waterproofing target structure using a welding machine, comprising:
welding the seam with the welding machine while moving the welding machine along the seam;
a step of acquiring output information including a heater temperature detected by a welding thermometer built into the heater of the welding machine during the welding over time from a temperature adjusting unit that performs feedback control to keep the heater at a reference temperature ;
storing the output information in a storage unit;
and creating display data representing the temperature of the heater at each position in the extension direction of the waterproof sheet seam and each corresponding position value from the stored output information. Each of the positional correspondence values is an elapsed time from the start of welding,
8. The waterproof sheet joint welding management method according to claim 7, wherein the creating step creates display data showing the temperature of the heater versus the elapsed time. a position of the welding machine at the time of acquisition is estimated from a length from a welding start position to a welding end position of the seam, a time from the welding start position to the welding end position, and an elapsed time from the welding start position to the acquisition of the output information;
8. The waterproof sheet joint welding management method according to claim 7, wherein the display data is created using the estimated positions as the position corresponding values. acquiring speed information of the welding machine as the output information, and estimating the position of the welding machine at the time of acquiring the output information from the speed information;
8. The waterproof sheet joint welding management method according to claim 7, wherein the display data is created using the estimated positions as the position corresponding values. A waterproof sheet seam welding management method as described in claim 10, characterized in that the estimated position is corrected based on a calculated value of the travel distance from the start of welding to the end of welding based on the speed information of the welding machine and the actual distance from the welding start position to the welding end position.