JP2024001345A - Management method of concrete spray thickness and management system of concrete spray thickness - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a management method of a concrete spray thickness and a management system of the concrete spray thickness improving efficiency of spray operations of a concrete material on an excavation surface.

SOLUTION: A management method of a concrete spray thickness for managing a thickness of a concrete material sprayed on a face plane F of a tunnel T includes: a target setup process of setting a target spray thickness of the concrete material sprayed on the face plane F; a reference distance measurement process of measuring a reference distance to the face plane F on which the concrete material has not yet been sprayed; a surface distance measurement process of measuring a surface distance to a sprayed surface of the face plane F sprayed with the concrete material; a difference calculation process of calculating a difference between the measured reference distance and the measured surface distance; and an information display process of displaying specific information on the sprayed surface in accordance with a result acquired through comparing the calculated difference to the target spray thickness.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

Application for application of Article 30, Paragraph 2 of the Patent Act Meeting name: 2019 Japan Society of Civil Engineers National Conference in Shikoku, date: September 5, 2020 Publication name: 2019 Japan Society of Civil Engineers National Conference in Shikoku 74th Annual Academic Conference Lecture Summary Collection VI-733, Publisher: Japan Society of Civil Engineers, Publication Date: August 1, 2020 Publication Address: https://confit. atlas. jp/guide/event/jsce2019/top (2019 Japan Society of Civil Engineers National Conference in Shikoku homepage), Publication date: August 2020

The present invention relates to a concrete spray thickness management method and a concrete spray thickness management system for managing the thickness of concrete material sprayed onto an excavated surface.

The NATM construction method, which is mainly used for constructing mountain tunnels, consists of repeating the blasting process, scraping process, primary concrete spraying process, shoring erection process, and secondary concrete spraying process at predetermined distances to form the tunnel in the axial direction. We will continue to build.

In the process after the shoring erection process, workers may work near the tunnel face. Since there is a risk of the face surface spalling, in order to increase the safety of work near the face surface, in the primary concrete spraying process, the face surface is stabilized by spraying concrete material onto the face surface (patented). Reference 1).

Japanese Patent Application Publication No. 2000-283756

In the method disclosed in Patent Document 1, the spraying thickness is calculated based on the shape data of the wall surface before concrete material is sprayed and the shape data of the wall surface after concrete material is sprayed, and the sprayed thickness is The coating thickness is displayed on the monitor. Therefore, in order to set the spraying thickness at each part of the excavated surface to the target thickness, the worker performing the spraying work needs to proceed with the work while checking the spraying thickness displayed on the monitor. However, it is difficult for workers who perform spraying work while looking at the sprayed surface to sequentially check the spraying thickness of each part by looking at a relatively small monitor, and each time they check the spraying thickness, they have to If this is interrupted, work efficiency will decrease.

An object of the present invention is to improve the efficiency of a spraying operation for spraying concrete material onto an excavated surface.

The present invention is a concrete spraying thickness control method for managing the thickness of concrete material sprayed onto an excavated surface of a tunnel, and includes a target setting step of setting a target sprayed thickness of concrete material to be sprayed onto the excavated surface. a reference distance measuring step of measuring a reference distance to the excavated surface to which concrete material has not been sprayed; and a surface distance measurement step to measure the surface distance to the sprayed surface of the excavated surface to which concrete material has been sprayed. a difference calculation step of calculating a difference between the measured reference distance and the surface distance; and a step of calculating a difference between the measured reference distance and the surface distance, and applying predetermined information to the sprayed surface according to a result of comparing the calculated difference and the target sprayed thickness. and an information display step of displaying the information.

The present invention also provides a concrete spraying thickness management system for managing the thickness of concrete material sprayed onto an excavated surface of a tunnel, comprising: a distance detector capable of measuring the distance to the excavated surface; A display device capable of displaying predetermined information on the sprayed surface of the excavated surface being sprayed; and a control device that controls the display device based on a detected value of the distance detector, the control device , a target spraying thickness of concrete material to be sprayed on the excavated surface is set, a reference distance to the excavated surface on which concrete material is not sprayed is measured by the distance detector, and a target spraying thickness is set for the concrete material to be sprayed on the excavated surface, and a reference distance to the excavated surface on which concrete material is not sprayed is measured by the distance detector; A surface distance of the excavated surface to the sprayed surface is measured by the distance detector, a difference between the measured reference distance and the surface distance is calculated, and the calculated difference is compared with the target sprayed thickness. According to the result, the display device displays predetermined information on the spraying surface.

According to the present invention, it is possible to improve the efficiency of spraying work for spraying concrete material onto an excavated surface.

1 is a schematic view of a concrete material spraying operation to which a concrete spraying thickness management system according to an embodiment of the present invention is applied, viewed from the side of a tunnel. It is a figure which shows the face surface of the tunnel during spraying work. FIG. 1 is a block diagram of a control device of a concrete spray thickness management system according to an embodiment of the present invention. It is a flowchart which shows processing by a control device.

EMBODIMENT OF THE INVENTION Hereinafter, with reference to drawings, the concrete spraying thickness management method and concrete spraying thickness management system 100 which concern on embodiment of this invention are demonstrated. Here, a concrete spraying thickness management method and a concrete spraying thickness management system 100 for managing the thickness of concrete material sprayed onto an excavated surface in the NATM construction method will be described with reference to FIGS. 1 to 4.

In the NATM construction method, the tunnel T is constructed along the axial direction by repeating a blasting process, a sloughing process, a primary concrete spraying process, a shoring installation process, and a secondary concrete spraying process every 1 to 2 m, for example.

In the steps after the shoring erection step, workers may work near the face F, which is the excavation surface of the tunnel T. Since there is a risk of the face F peeling off, in order to increase the safety of work near the face F, concrete material is not applied to the face F in the primary concrete spraying process, which is a pre-process of the shoring erection process. The face F is stabilized by spraying.

Specifically, as shown in FIG. 1, a concrete structure is formed by spraying unhardened concrete material onto the face surface F using a spraying machine 20 and hardening the sprayed concrete material. By generating this on the surface of the face F, the face F is stabilized. Mortar may be used as the concrete material. Further, when spraying the concrete material, an quick-setting agent is added in order to accelerate the hardening of the concrete sprayed onto the face surface F.

The spraying machine 20 is a spraying device that sprays concrete material from a nozzle 21, and includes a cart 22, a concrete pump 23 as a pumping means for pumping the concrete material to the nozzle 21, and an addition means for adding an quick-setting agent to the concrete material. and a nozzle drive unit 30 that moves the nozzle 21 in a state facing the face F of the tunnel T. The spraying machine 20 can spray the concrete material onto the entire face F by spraying the concrete material while moving the nozzle 21 using the nozzle drive unit 30.

The trolley 22 is self-propelled and can move within the tunnel T. When spraying concrete material onto the face F, the front part of the cart 22 on which the nozzle drive unit 30 is provided is directed toward the face F, and after moving to a place a predetermined distance away from the face F. , a jack (not shown) is extended to ensure that the truck 22 is stopped.

The concrete pump 23 is provided on the truck 22 together with a hopper 25 for storing concrete material. The hopper 25 is mounted on the rear part of the truck 22, and concrete material is charged into the hopper 25 from the mixer truck M. The concrete pump 23 sucks concrete material from the hopper 25 and pumps it to the nozzle 21 through piping (not shown). The pumped concrete material is mixed with high pressure air and injected from the nozzle 21.

The quick setting agent pump 24 is provided on the cart 22 similarly to the concrete pump 23. The quick-setting agent pump 24 is connected to the nozzle 21 through a pipe (not shown), and supplies the quick-setting agent in a quick-setting agent tank (not shown) to the nozzle 21 . The quick setting agent supplied to the nozzle 21 is added to the concrete material inside the nozzle 21, and is injected from the nozzle 21 together with the concrete material.

The nozzle drive unit 30 includes a boom 31 that is swingably and extendably provided at the front of the truck 22, and an arm 32 that is swingably and extendably provided at the tip of the boom 31. Since the nozzle 21 is attached to the tip of the arm 32, by swinging and extending/contracting the boom 31 and the arm 32, the nozzle 21 can be opened with the injection port provided at the tip of the nozzle 21 facing the face F. It is possible to move the position to any desired position. Therefore, the concrete material can be sprayed onto the entire face F through the nozzle 21. The operation of the nozzle drive unit 30, that is, the adjustment of the position of the nozzle 21 with respect to the face surface F, is performed by an operator via the controller 27 that can communicate with a control unit (not shown) that controls the drive of the nozzle drive unit 30.

When spraying concrete material onto the face F using the spray machine 20 configured as described above, the operator checks the thickness of the concrete material sprayed onto the face F while looking at the surface of the face F onto which the concrete material has been sprayed. The controller 27 is operated, and the position of the nozzle 21, the pressure of the concrete material to be sprayed, etc. are adjusted as appropriate so that the spray thickness reaches a preset target spray thickness over the entire area.

Here, the face surface F becomes more stable as the sprayed thickness of the concrete material increases, so it is desirable to make the sprayed thickness of the concrete material as thick as possible. On the other hand, if the spraying thickness of the concrete material is made thicker than necessary, the concrete material will be wasted and the working time will increase, resulting in an increase in the construction cost of the tunnel T. For this reason, it is preferable that the spraying operation of spraying the concrete material onto the face surface F is completed when the spraying thickness exceeds the target spraying thickness. However, it is difficult for workers to sequentially check the spray thickness over the entire area of the face F, and even if they check the spray thickness at multiple arbitrary locations, they have to stop the work each time. This will reduce work efficiency.

Further, if there are cracks in some parts of the face F, there is a high risk of peeling off, so it is necessary to increase the spray thickness in this part. However, it is difficult to successively check whether the spray thickness of a specific part is sufficient, and if work is interrupted every time the spray thickness of this part is checked, work efficiency will decrease. I will do it.

In order to solve such problems, in this embodiment, a concrete spraying thickness management system 100 (hereinafter referred to as "management system 100") is used to manage the thickness of concrete material sprayed onto the face F, which is the excavation surface. It is provided in the spray machine 20 having the above configuration.

Next, the management system 100 will be described with reference to FIGS. 1 to 4. FIG. 2 is a diagram showing the face F as seen from the spray machine 20, FIG. 3 is a block diagram of a control device 50, which will be described later, and FIG. 4 is a flowchart showing processing by the control device 50.

As shown in FIG. 1, the management system 100 includes a distance sensor (distance detector) 41 that is attached to the truck 22 and is capable of measuring the distance to the face F, and a distance sensor (distance detector) 41 that is attached to the truck 22 and can measure the distance to the face F to which concrete material is sprayed. It includes a display device 42 that can display predetermined information on the sprayed surface of F, and a control device 50 that controls the display device 42 based on the detected value of the distance sensor 41.

The distance sensor 41 is a laser displacement meter using a laser beam, and can measure the distance to the face F before the concrete material is sprayed, and can also measure the spraying thickness by spraying the concrete material. It is possible to measure in real time the distance to the spraying surface of the face F, where the thickness gradually increases. The distance measured by the distance sensor 41 is input to the control device 50.

Specifically, the distance sensor 41 measures the distance between the cart 22 and a measurement point 45 on the face F, indicated by reference numeral 45 in FIG. 2 . A measurement point 45 on the face F where the distance is measured by the distance sensor 41 is always displayed as a point in red, for example, by a laser beam irradiated from the distance sensor 41. Therefore, the operator can grasp which part is being measured by the distance sensor 41.

The display device 42 is a laser display device using laser light, and is capable of displaying predetermined information 46 on the spraying surface of the working face F onto which concrete material is sprayed. As shown in FIG. 2, the predetermined information 46 includes, for example, figures 46a such as dots and circles, and characters 46b such as numbers and alphabets, which are displayed in colors such as red, blue, and green. The predetermined information 46 displayed on the spraying surface by the display device 42 is changed at any time by commands from the control device 50. Note that the predetermined information 46 has a size and color that can be sufficiently recognized by the operator.

The distance sensor 41 and the display device 42 are integrated as an irradiation unit 40 and are arranged on the side, top, or front of the trolley 22. The irradiation unit 40 is arranged corresponding to each of the spray areas F1 to F4 obtained by dividing the face F, as shown in FIG. That is, for example, when the face surface F is divided into four spray areas F1 to F4 as shown in FIG. 2, four irradiation units 40 are installed on the truck 22. In addition, the face surface F may be divided into five or more spray regions, may be divided into three or less spray regions, or does not need to be divided into a plurality of spray regions. Further, the line dividing the face F may extend in the horizontal direction and the vertical direction, for example, as shown by the dashed line in FIG. 2, or it may extend only in either the horizontal direction or the vertical direction. or may extend in any direction.

One distance sensor 41 and one display device 42 are arranged in each irradiation unit 40. Therefore, as shown in FIG. 2, one measurement point 45 and one predetermined information 46 are displayed in each of the spray areas F1 to F4.

The control device 50 includes a CPU (Central Processing Unit) that performs arithmetic processing, a ROM (Read-Only Memory) that stores control programs, etc. executed by the CPU, and a RAM (Random Access Memory) that stores the calculation results of the CPU. ) and a microcomputer including. The control device 50 may be composed of a single microcomputer or a plurality of microcomputers.

As shown in FIG. 3, the control device 50 includes a target setting unit 51 that sets a target spray thickness of concrete material to be sprayed onto the face F, and a distance to the face F on which concrete material is not sprayed. A storage unit 52 that stores the reference distance, a difference calculation unit 53 that calculates the difference between the reference distance stored in the storage unit 52 and the current distance to the face face F, and a target spraying unit 51 that calculates the difference between the reference distance and the current distance to the face F. a comparison section 54 that compares the thickness with the difference calculated by the difference calculation section 53; a display instruction section 55 that instructs the display device 42 to display predetermined information based on the comparison result of the comparison section 54; has. Note that the target setting section 51, the storage section 52, the difference calculation section 53, the comparison section 54, and the display instruction section 55 perform a virtual function of the control device 50 that controls the display device 42 based on the detected value of the distance sensor 41. It is expressed as a unit.

The target setting unit 51 sets target spray thicknesses for each of the spray areas F1 to F4 based on the possibility that flaking will occur in each of the spray areas F1 to F4. Specifically, the likelihood of flaking occurring in each of the spray areas F1 to F4 is determined based on the presence or absence of cracks, etc., and, for example, the target spray thickness for an area that has multiple cracks and is determined to be prone to flaking is determined. , set it to a larger value than other areas. Note that the target spray thickness for each of the spray areas F1 to F4 may be input by the operator via an input terminal (not shown).

The storage unit 52 is a part that stores the distance detected by the distance sensor 41, and mainly stores the distance measured by the distance sensor 41 provided in each of the spraying areas F1 to F4 before concrete material is sprayed. is stored as a reference distance for each spray area F1 to F4.

The difference calculation unit 53 calculates the difference between the reference distance stored in the storage unit 52 and the distance currently measured by the distance sensor 41 that measured this reference distance, and in particular calculates the difference between the reference distance stored in the storage unit 52 and the distance currently measured by the distance sensor 41 that measured this reference distance. The difference continues to be calculated from the start of concrete material spraying until the spraying work is completed. The difference calculated by the difference calculating section 53 in this way corresponds to the current spray thickness at the measurement point 45 of each spray area F1 to F4, and the calculated difference is sent to the comparison section 54.

The comparison unit 54 compares the difference calculated by the difference calculation unit 53, that is, the current spray thickness of each spray area F1 to F4, and the target spray thickness of each spray area F1 to F4 set in the target setting unit 51, This is the part that compares the current spray thickness and determines whether or not the current spray thickness exceeds the target spray thickness. The determination result in the comparison section 54 is sent to the display instruction section 55.

The display instruction section 55 instructs the display device 42 provided in each of the spraying regions F1 to F4 to display predetermined information on the spraying surface of each of the spraying regions F1 to F4 based on the determination result of the comparison section 54. For example, as shown in Figure 2, the spraying surface in the spraying areas F2 and F4, where the current spraying thickness does not exceed the target spraying thickness, indicates that the spraying thickness is still insufficient. The display device 42 of each spraying region F2, F4 is instructed to display a red circle as a sign indicating that the spraying area is present. On the other hand, on the spraying surface of the spraying areas F1 and F3 where the current spraying thickness exceeds the target spraying thickness, a blue character string "OK" is displayed as a sign indicating that the spraying thickness is sufficient. The display device 42 of each spray area F1, F3 is instructed to be displayed.

As mentioned above, in the spraying areas F1 to F4, the measurement points 45 are always displayed in red by the laser beam irradiated from the distance sensor 41, which indicates that the spraying thickness is insufficient. If the information is displayed in red, there is a risk that it will be mistaken for the measurement point 45. In order to prevent such misidentification, the information is displayed in a circle that is sufficiently larger than the measurement point 45, in a different color than the measurement point 45, or in a string of letters or in a shape other than a circle. It is preferable.

Signs indicating information are not limited to the above-mentioned shapes and character strings; for example, a sign indicating information that the spray thickness is sufficient may be a blue circle instead of the character string "OK". or a green circle may also be used. In addition to the above two types of information signs, for example, a yellow circle may be added to indicate that the spray thickness is almost reaching the target spray thickness, or A graphic or the like whose color gradually changes from warm to cool as the thickness approaches the target spraying thickness may be used.

Next, the operation of the management system 100 will be explained with reference to the flow shown in FIG.

First, in step S10 (target setting step), in a state where the concrete material has not yet been sprayed on the face surface F, the target spraying thickness for each of the spraying areas F1 to F4 is set by the target setting unit 51, respectively. Note that the target spray thicknesses of the spray areas F1 to F4 may not be set to different thicknesses, but may be set to the same predetermined thickness, for example.

When it is detected that the trolley 22 of the spraying machine 20 is in a stopped state and is ready for spraying work, the process proceeds to step S11 (reference distance measurement step), where a reference distance is measured. Specifically, distance sensors 41 provided for each of the spraying regions F1 to F4 measure the distance between the cart 22 and a measurement point 45 on the spraying regions F1 to F4 where concrete material is not sprayed. .

The distance measured in this way is stored in the storage unit 52 as a reference distance. Note that the measurement of the reference distance in step S11 may be performed by the operator operating a measurement start button (not shown).

When the measurement of the reference distances in all spray areas F1 to F4 is completed, the process proceeds to step S12 (surface distance measurement step), and the distance sensor 41 that has measured the reference distance starts measuring the surface distance from the cart 22 to the spray surface. be done. The measurement in step S12 may be started at the same time as the measurement of the reference distance in step S11 is completed, or may be started after it is detected that the concrete material spraying operation has started. Note that the start of the spraying work can be detected, for example, by the operator operating the controller 27 or by detecting the injection pressure at the nozzle 21.

In the subsequent step S13 (difference calculation step), the difference calculation unit 53 calculates the difference between the surface distance measured in step S12 from the cart 22 to the spraying surface on which concrete material is sprayed and the reference distance measured in step S11. Calculated by

When the difference, that is, the current spray thickness is calculated in step S13, in the following step S14 (comparison step), the difference calculated in step S13 and the target spray thickness set in step S10 are compared. This is performed in the comparison section 54.

If it is determined in step S14 that the difference exceeds the target spray thickness, the process proceeds to step S15, and if it is determined in step S14 that the difference does not exceed the target spray thickness, the process proceeds to step S16. Note that the comparison between the difference and the target spray thickness in step S14 is performed for each spray region F1 to F4.

In step S15 (information display step), the display device 42 receives an instruction from the display instruction section 55 to display predetermined information on the spray surfaces of the spray regions F1 to F4. In step S15, since the current spray thickness already exceeds the target spray thickness, a blue character string "OK" (46b) is displayed on the spray surface as an indicator indicating that the spray thickness is sufficient. Is displayed.

On the other hand, in step S16 (information display step), similarly to step S15, the display device 42 receiving instructions from the display instruction section 55 displays predetermined information on the spraying surfaces of the spraying areas F1 to F4. . In step S16, since the current spray thickness has not yet reached the target spray thickness, a red circle (46a) is displayed on the spray surface as an indicator indicating information that the spray thickness is insufficient.

Incidentally, since step S13 and step S14 are performed for each spraying region F1 to F4, information display in step S15 and step S16 is also performed for each spraying region F1 to F4. Therefore, for example, as shown in FIG. 2, information that the spraying thickness is sufficient is displayed on the spraying surfaces of the first spraying area F1 and the third spraying area F3 where the spraying thickness is sufficient. Information that the spray thickness is insufficient will be displayed on the spray surfaces of the second spray region F2 and the fourth spray region F4 where the thickness is still insufficient.

In this way, signs indicating information such as whether the spraying thickness is sufficient or insufficient are displayed on the spraying surface of each spraying area F1 to F4, so that spraying work can be performed while looking at the spraying surface. The operator can easily recognize the state of the spray thickness on the face surface F, such as which areas the spray thickness is sufficient and which areas the spray thickness is insufficient.

If the spraying thickness is insufficient, the spraying operation is normally continued, so if the process proceeds to step S16, the process returns to step S13 and the difference is calculated again. In other words, the information displayed in step S16 will continue to be displayed until the spray thickness becomes sufficient.

On the other hand, if the spraying thickness is sufficient, there is a possibility that the spraying work will be completed, so if the process advances to step S15, the process advances to step S17, where it is determined whether the spraying work has ended or not. Ru.

Even if information indicating that the spray thickness is sufficient is displayed on the spray surface in step S15, the operator may not notice it because visibility is relatively poor during the spray work. Furthermore, even if the spraying thickness in any of the spraying areas F1 to F4 exceeds the target spraying thickness, the spraying thickness is still insufficient in the other spraying areas F1 to F4, and it is necessary to continue the spraying operation. Sometimes there is. In such a case, it is necessary to continue to show information that the spraying thickness is sufficient, so if it is determined in step S17 that the spraying work has not been completed, the process returns to step S15. The information created will continue to be displayed.

On the other hand, if it is determined in step S17 that the spraying work has been completed, it is no longer necessary to display information on the spraying surface, that is, the spraying thickness exceeds the target spraying thickness in all spraying areas F1 to F4. In this state, the process proceeds to step S18, where the display device 42 ends the display of information, the distance sensor 41 ends measurement, and all the irradiation units 40 become inactive.

Note that the end of the spraying work can be detected, for example, when the controller 27 is not operated by the operator for a predetermined period of time or more, or when the injection pressure is no longer detected at the nozzle 21. Alternatively, it may be determined that the spraying work has ended when the operator operates a work end button or a measurement end button (not shown).

Through the series of steps described above, the spraying work of concrete material onto the face surface F by the spraying machine 20 to which the management system 100 is applied is completed.

According to the above embodiment, the following effects are achieved.

In the concrete spraying thickness management method and concrete spraying thickness management system 100, a sign indicating information such as whether the spraying thickness is sufficient or insufficient is displayed on the spraying surface of each of the spraying areas F1 to F4. For this reason, even if the operator performs spraying work while looking at the spraying surface of the face F, it is difficult to determine which areas of the face F have sufficient spray thickness and which areas have insufficient spray thickness. It is possible to easily recognize the condition of the sprayed thickness of F. In this way, the efficiency of the spraying operation can be improved by allowing the operator to grasp the spraying thickness without interrupting the spraying operation.

Further, in the concrete spraying thickness management method and the concrete spraying thickness management system 100, the operator can easily recognize which of the spraying regions F1 to F4 has a sufficient spraying thickness. This prevents unnecessary spraying of concrete material in areas where the spraying thickness is sufficient. As a result, the spraying work time can be shortened and the construction cost of the tunnel T can be reduced.

Further, in the concrete spraying thickness management method and the concrete spraying thickness management system 100, a sign indicating information such as whether the spraying thickness is sufficient or insufficient is displayed on the spraying surface of each spraying area F1 to F4. . Therefore, even if the target spray thickness is different for each spray area F1 to F4, the operator can check whether the spray thickness in a specific area has reached the target spray thickness without interrupting the work. This can be easily determined, and as a result, the efficiency of spraying work can be improved.

Furthermore, in the concrete spraying thickness management system 100, a distance sensor 41 and a display device 42 are provided on the cart 22 of the spraying machine 20. By attaching the distance sensor 41 and the display device 42 in advance to the cart 22 of the spraying machine 20 that sprays concrete material onto the face F, it is possible to easily install and fix the distance sensor 41 and the display device 42 separately. No longer needed. As a result, the efficiency of spraying work can be further improved.

Although the embodiments of the present invention have been described above, the above embodiments merely show a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. do not have.

In the embodiment described above, the excavated surface on which concrete material is sprayed and information is displayed on the sprayed surface is the face surface F. The excavated surface on which information is displayed on the blasting surface is not limited to the face F, but may be, for example, the inner wall surface RS of the ground exposed together with the face F in the blasting process (see Figure 1), or the Any wall surface may be used as long as it is a wall surface onto which concrete material is sprayed for reasons such as fear.

Furthermore, in the embodiment described above, two pieces of information are displayed on the spray surface: information that the spray thickness is insufficient and information that the spray thickness is sufficient. Alternatively, only one of the information may be displayed on the spraying surface.

Further, in the embodiment described above, one distance sensor 41 and one display device 42 are arranged in the irradiation unit 40. Instead, in cases where the geology within the spraying area is complex or the area of the spraying area is large, a plurality of distance sensors 41 may be arranged in one irradiation unit 40 in order to improve distance measurement accuracy. You may.

In this case, a plurality of measurement points 45 are displayed in each of the spray areas F1 to F4 according to the number of distance sensors 41, and the distances measured by the plurality of distance sensors 41 are stored in the storage unit 52, respectively. . In this case, in step S14, the difference between the current distance and the reference distance is compared with the target spray thickness for each distance sensor 41, and if all the differences exceed the target spray thickness, the process advances to step S15, If there is a difference that does not exceed the target spraying thickness at any time, the process proceeds to step S16.

100... Concrete spraying thickness management system 20... Spraying machine (spraying device)
21... Nozzle 22... Trolley 41... Distance sensor (distance detector)
42... Display device 46... Predetermined information 46a... Graphic (predetermined information)
46b...Character (predetermined information)
50...Control device F...Face (excavation surface)
F1...first spray area (spray area)
F2...Second spray area (spray area)
F3...Third spray area (spray area)
F4...4th spray area (spray area)
T...Tunnel

Claims (6)

A concrete spraying thickness control method for controlling the thickness of concrete material sprayed on an excavated surface of a tunnel, the method comprising:
a target setting step of setting a target spraying thickness of concrete material to be sprayed on the excavation surface;
a reference distance measuring step of measuring a reference distance to the excavation surface on which concrete material is not sprayed;
a surface distance measuring step of measuring the surface distance to the sprayed surface of the excavated surface on which concrete material is sprayed;
a difference calculation step of calculating a difference between the measured reference distance and the surface distance;
an information display step of displaying predetermined information on the spraying surface according to a result of comparing the calculated difference and the target spraying thickness;
Concrete spray thickness control method. In the information display step, when the calculated difference exceeds the target spraying thickness, displaying the predetermined information on the spraying surface.
The concrete spraying thickness control method according to claim 1. The excavation surface is divided in advance into a plurality of spraying areas,
In the reference distance measuring step, the reference distance is measured for each spray area,
In the surface distance measuring step, the surface distance is measured for each spray area,
In the information display step, displaying the predetermined information for each spraying area;
The concrete spraying thickness control method according to claim 1 or 2. A concrete spraying thickness management system for managing the thickness of concrete material sprayed on an excavated surface of a tunnel, the system comprising:
a distance detector capable of measuring the distance to the excavation surface;
a display device capable of displaying predetermined information on the sprayed surface of the excavated surface onto which concrete material is sprayed;
a control device that controls the display device based on the detected value of the distance detector,
The control device sets a target spraying thickness of concrete material to be sprayed onto the excavated surface, measures a reference distance to the excavated surface on which concrete material is not sprayed using the distance detector, and measures whether the concrete material is sprayed on the excavated surface. The surface distance of the excavated surface being sprayed to the spraying surface is measured by the distance detector, the difference between the measured reference distance and the surface distance is calculated, and the calculated difference and the target spraying are displaying predetermined information on the spraying surface by the display device according to the result of comparing the thickness;
Concrete spray thickness control system. The distance detector is provided on a truck of a spraying device that sprays concrete material from a nozzle onto the excavation surface.
The concrete spray thickness management system according to claim 4. The excavation surface is divided in advance into a plurality of spraying areas,
The distance detector and the display device are provided for each spraying area,
The concrete spraying thickness management system according to claim 4 or 5.

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