Ground improvement material injection system

Abstract

This invention provides a ground improvement material injection system that converts injection information into image data and projects it onto the wall surface of the already excavated section of the tunnel, allowing workers located near the injection pipe opening to check the progress of the injection process, facilitating the transition to the next process and improving work efficiency. [Solution] This injection system 1 comprises an injection machine 7 for injecting a ground improvement material into a long steel pipe 4, and a projector 8 connected to the injection machine 7, which projects the injection information from the injection machine 7 as image data onto the wall surface S of the already excavated section of the tunnel 2. The injection information preferably includes at least one of the amount of ground improvement material injected and the injection pressure.

Description

Technical Field

[0001] The present invention relates to a method for reinforcing the face ground during tunnel excavation.

Background Art

[0002] When excavating a tunnel, so-called long steel pipe forepiling is known, in which long steel pipes are driven into the face ground in front of the periphery of the tunnel, and a ground improvement material is injected from within these long steel pipes to improve the ground. For example, in the method shown in Patent Document 1, a plurality of steel pipes of about 3 m are connected to form long steel pipes of about 10 to 20 m, and a plurality of these long steel pipes are driven into the outer periphery of the tunnel. After driving the long steel pipes, a ground improvement material is injected into each long steel pipe. For this injection into the long steel pipe, a bundle of a plurality of injection pipes having different lengths in the longitudinal direction is used, and it is common to divide the inside of the steel pipe into three to five steps for injection (see, for example, FIG. 6).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the injection process of the ground reinforcement material, when the injection of each step is completed or when the injection is stopped due to a pressure increase, it is necessary to detach the adapter at the injection pipe mouth. However, the signal indicating the end of injection was given orally from the operator operating the injector to the operator located at the injection pipe mouth. That is, there is a problem that the operator located at the injection pipe mouth cannot directly confirm the end of injection. Even when a buzzer or a lamp is provided on the injector, it is difficult to confirm reliably because of the noise at the work site and the possibility that the injector may be in a blind spot of heavy machinery.

[0005] The present invention has been made in view of the above problems, and aims to provide a ground improvement material injection system that converts injection information into image data and projects it onto the wall surface of the already excavated section of the tunnel, thereby allowing workers located at the injection pipe opening to check the progress of the injection process, facilitating the transition to the next process and improving work efficiency. [Means for solving the problem]

[0006] The present invention is as follows: 1. A ground improvement material injection system used in a construction method in which multiple long steel pipes are driven into the unexcavated ground of a tunnel, and ground improvement material is injected through the inside of the long steel pipes and into cracks in the surrounding ground by discharge holes provided on the outer circumference of the long steel pipes to reinforce the ground, An injection machine for injecting ground improvement material into the aforementioned long steel pipe, A ground improvement material injection system characterized by comprising a projector connected to the injection machine, which projects the injection information from the injection machine as image data onto the wall surface of the already excavated section of the tunnel. 2. The injection system for ground improvement materials according to 1. above, characterized in that the injection information includes at least one of the amount of ground improvement material to be injected and the injection pressure. 3. The injection machine comprises a flow meter for measuring the flow rate of the ground improvement material, an integration unit for accumulating the injection amount based on the flow rate measured by the flow meter and the injection time, and a conversion unit for converting the accumulated injection amount into image data. The ground improvement material injection system according to 1. above, characterized in that the projector projects the converted image data. 4. The injection machine comprises a pressure gauge for measuring the injection pressure of the ground improvement material, and a conversion unit for converting the injection pressure measured by the pressure gauge into image data. The ground improvement material injection system according to 1. above, characterized in that the projector projects the converted image data. [Effects of the Invention]

[0007] According to the present invention, the progress of the injection process is projected as image data onto the wall surface of the already excavated section of the tunnel. This allows all workers to check the progress of the injection process from any position during the work, making it easier to determine when the injection is complete and thus improving work efficiency. [Brief explanation of the drawing]

[0008] The present invention will be further described in the following detailed description with reference to the drawings, which refer to several drawings, with reference to non-limiting examples of typical embodiments of the present invention, although similar reference numerals indicate similar components in several of the drawings. [Figure 1] This is a front view of the injection system for ground improvement material according to the embodiment. [Figure 2] This is a block diagram of the injection system. [Figure 3] This is an explanatory diagram of the operation of the injection system. (a) shows the projection image before the start of injection, (b) shows the projection image during injection, (c) shows the projection image when a predetermined step reaches the set injection amount, and (d) shows the projection image when all steps have reached the set injection amount. [Figure 4] This is an explanatory diagram of the operation of the injection system. (a) shows a projection image before the start of injection, (b) shows a projection image during injection, and (c) shows a projection image when a predetermined step reaches the upper pressure limit. [Figure 5] This is an explanatory diagram for illustrating the ground reinforcement method according to the embodiment, where (a) shows a cross-section substantially perpendicular to the tunnel axis direction, and (b) shows a longitudinal section along the tunnel axis direction. [Figure 6] This is an explanatory diagram for describing ground reinforcement methods. [Figure 7] This is an explanatory diagram of other forms of projection images. [Modes for carrying out the invention]

[0009] The matters presented herein are illustrative and illustrative to illustrate embodiments of the present invention, and are intended to provide what is considered to be the most effective and readily understandable explanation of the principles and conceptual features of the present invention. In this regard, it is not intended to show structural details of the present invention beyond what is necessary for a fundamental understanding of the invention, and the description, in conjunction with the drawings, will make it clear to those skilled in the art how some forms of the present invention are actually embodied.

[0010] The present invention will be specifically described below with reference to embodiments using the drawings.

[0011] The ground improvement material injection system 1 of this embodiment is used as a pre-ground reinforcement method during tunnel excavation. In this method, multiple long steel pipes 4 are driven into the unexcavated ground 3 of the tunnel 2 (see Figure 5), multiple injection pipes 5 of different lengths are inserted into the long steel pipes 4 to divide the inside of the long steel pipes 4 into multiple (three in the figure) steps (regions) 6a to 6c (see Figure 6), and ground improvement material is injected from each injection pipe 5 into each step 6a to 6c using an injection machine 7, and the ground improvement material is allowed to penetrate into cracks in the surrounding ground through discharge holes (not shown) provided on the outer circumference of the long steel pipes 4 to reinforce the ground.

[0012] In this embodiment, examples of ground improvement materials include two-component mixed curing type urethane-based ground improvement materials and silica resin-based ground improvement materials consisting of liquid A (main agent) and liquid B (hardener). However, inorganic ground improvement materials (e.g., cement-based, water glass-based, etc.) may be used instead of urethane-based ground improvement materials.

[0013] As shown in Figures 1 and 2, this injection system 1 includes an injection machine 7 for injecting ground improvement material into a long steel pipe 4, and a projector 8 connected to the injection machine 7 that projects the injection information from the injection machine 7 as image data onto the wall surface S of the already excavated section of the tunnel 2 (specifically, the sprayed concrete surface: see Figure 5). The injection machine 7 consists of a pump unit 11 for pumping the ground improvement material and a control unit 12 to which the pump unit 11 is connected.

[0014] The pump unit 11 has a plurality of pairs (three pairs in Fig. 1) of injection pumps 14A and 14B for pumping and mixing two types of liquid A and liquid B for each injection pipe 5. The injection pump 14A for liquid A is connected to a tank 15A into which liquid A is charged, and the injection pump 14B for liquid B is connected to a tank 15B into which liquid B is charged. A flow meter 17 for measuring the flow rate of the ground improvement material and a pressure gauge 18 for measuring the injection pressure of the ground improvement material are provided in the flow path on the downstream side of the discharge ports of the injection pumps 14A and 14B.

[0015] The control unit 12 includes a management screen 21 for displaying the injection amount and injection pressure during injection, a control panel 22 for starting / stopping and adjusting the flow rate of each pump 14A, 14B, and an input unit 23 such as a touch panel for inputting the set values of the injection amount and injection pressure prior to injection. Further, the control unit 12 includes an integration unit 24 for integrating the injection amount based on the flow rate measured by the flow meter 17 and the injection time, and a conversion unit 25 for converting the integrated injection amount and the injection pressure measured by the pressure gauge 18 into image data. Specifically, the conversion unit 25 converts the actual injection amount and injection pressure into respective image data according to the set values of the injection amount and injection pressure input by the input unit 23. Furthermore, the conversion by the conversion unit 25 into image data may be performed constantly during injection or intermittently.

[0016] Note that the processing of the processing units 21 to 25 by the control unit 12 may be realized by either hardware or software. Preferably, it can be configured with a microcontroller (microcomputer) including a CPU, a storage device (such as ROM, RAM), an input / output circuit, etc., and peripheral circuits such as an input / output interface.

[0017] The projector 8 projects the image data sent from the control unit 12 onto the wall surface S of the excavated portion of the tunnel 2 (see FIGS. 3 and 4). Specifically, the projector 8 projects the image data of the plurality of steps 6a to 6c onto separate wall surfaces S partitioned by the support 34 (specifically, the arch-shaped steel support 34). However, the image data of the plurality of steps may be projected onto the same wall surface S partitioned by the support 34. The wall surface S onto which the image data is projected may be the tunnel ceiling, but since facilities such as lighting and ventilation are often installed on the ceiling, it is preferably the side wall surface. As the projector 8, a CRT projector, a liquid crystal projector, a DLP projector, etc. can be used. The installation location of the projector 8 is not particularly limited as long as an image can be projected at a position where the wall surface S is visible, and it may be installed on the injector 7 or at a location away from the injector 7. Further, the projector 8 and the injector 7 (specifically, the control unit 12) are connected by wire such as a cable. However, the projector 8 and the injector 7 may be wirelessly connected if they have a communication function.

[0018] Next, the operation and effect of the in-situ improvement material injection system 1 having the above configuration will be described. First, the long steel pipe 4 is driven into the outer periphery of the tunnel 2 by a known method (see FIG. 5), and a plurality of injection pipes 5 having different lengths are inserted and fixed into the long steel pipe 4 (see FIG. 6). Next, an injection hose 32 connected to the pump unit 11 of the injector 7 is connected to the adapter 31 at the mouth of the plurality of injection pipes 5. In FIG. 6, the reference numeral "41" indicates a packer, and the reference numeral "42" indicates a rubber check valve.

[0019] When construction management is performed using the injection amount as an indicator, the set injection amounts for each step 6a to 6c are input to the control unit 12. The conversion unit 25 of the control unit 12 converts each input set injection amount into image data for each step 6a to 6c and sends it to the projector 8, which projects it onto the side wall surface S of the already excavated section of the tunnel 2 as projected images 37a to 37c (see Figure 3(a)). Next, when injection is started by the injection machine 7, the accumulating unit 24 of the control unit 12 calculates the injection amount based on the flow rate measured by the flow meter 17 connected to the pump unit 11 and the injection time, and the conversion unit 25 of the control unit 12 sequentially erases blocks (regions) of projected image data as the injection amount increases (see Figure 3(b)). After that, as the injection amount increases, all image data blocks corresponding to the step that reached the set injection amount are erased, and it is confirmed that injection has ended at that step (see Figure 3(c)). Furthermore, when all image data blocks for steps 6a to 6c of the long steel pipe 4 are cleared, it is confirmed that the injection of the long steel pipe 4 has been completed (see Figure 3(d)).

[0020] In this embodiment, an example is provided in which erasable image data is projected, which decreases the area corresponding to the set injection amount as the injection amount (cumulative value) increases. This allows the operator to intuitively confirm the end of the injection. However, it is also possible to project cumulative image data, which increases the area corresponding to the injection amount (cumulative value) as the injection amount (cumulative value) increases.

[0021] On the other hand, when construction management is performed using injection pressure as an indicator, the upper limit pressure (set injection pressure) for each step 6a to 6c is input to the control unit 12. The conversion unit 25 of the control unit 12 converts each input upper limit pressure into image data for each step 6a to 6c and sends it to the projector 8, which projects it onto the side wall S of the already excavated section of the tunnel 2 as projected images 38a to 38c (see Figure 4(a)). Next, when injection is started by the injection machine 7, the conversion unit 25 of the control unit 12 sequentially partially colors the area within the frame of the projected image data in accordance with the increase in injection pressure measured by the pressure gauge 18 connected to the pump unit 11 (see Figure 4(b)). Subsequently, as the injection pressure increases, the area within the frame of the image data corresponding to the step where the upper limit pressure was reached is completely colored, and it is confirmed that injection has been completed in step 6b (see Figure 4(c)).

[0022] In this embodiment, an example is provided in which stacked image data is projected, increasing the area corresponding to the injection pressure (measured value) as the injection pressure (measured value) increases. This allows the operator to intuitively confirm the end of the injection. However, it is also possible to project erased image data, decreasing the area corresponding to the set injection pressure as the injection pressure (measured value) increases.

[0023] As described above, the ground improvement material injection system 1 of this embodiment includes an injection machine 7 for injecting ground improvement material into a long steel pipe 4, and a projector 8 connected to the injection machine 7, which projects the injection information from the injection machine 7 as image data onto the wall surface S of the already excavated section of the tunnel 2. As a result, the progress of the injection process is projected as image data onto the wall surface S of the already excavated section of the tunnel 2, so that all workers can check the progress of the injection process from any position during work (especially the position of the injection pipe 5 opening), making it easier to know when the injection is finished and thus improving work efficiency.

[0024] In this embodiment, the injection machine 7 includes a flow meter 17 for measuring the flow rate of the ground improvement material, a pressure gauge 18 for measuring the injection pressure of the ground improvement material, an accumulating unit 24 for accumulating the injection amount based on the flow rate measured by the flow meter 17 and the injection time, and a conversion unit 25 for converting the accumulated injection amount and the injection pressure measured by the pressure gauge 18 into image data. The projector 8 projects the converted image data. This allows for simultaneous construction management using the injection amount as an indicator and construction management using the injection pressure as an indicator, and enables more accurate confirmation of the completion of injection. In this case, it is preferable to project the image data of the injection amount (i.e., projected images 37a to 37c) and the image data of the injection pressure (i.e., projected images 38a to 38c) side by side (see Figure 7). In particular, by making one of the image data of the injection amount and the image data of the injection pressure an erase type and the other an accumulation type, the two can be easily distinguished.

[0025] Furthermore, in this embodiment, the projector 8 projects the image data from multiple steps 6a to 6c onto each wall surface S partitioned by the shoring 34. This makes it easy to identify and confirm the completion of each step 6a to 6c injection.

[0026] Furthermore, the present invention is not limited to the above embodiments, and various modified embodiments can be made within the scope of the present invention depending on the purpose and application. That is, in the above embodiment, an injection system 1 is exemplified in which the accumulated injection amount and the injection pressure measured by the pressure gauge 18 are converted into image data and each image data is projected onto the wall surface S of the already excavated section of the tunnel 2. However, the invention is not limited to this, and an injection system 1 may be made in which only one of the injection amount or injection pressure is converted into image data and that image data is projected onto the wall surface S of the already excavated section of the tunnel 2. In this form as well, all workers can check the progress of the injection process from any position during work, and the completion of injection becomes easier to understand, thus improving work efficiency.

[0027] The present invention is not limited to the embodiments detailed above, and various modifications or changes are possible within the scope of the claims of the present invention. [Industrial applicability]

[0028] This invention is widely used as a technology related to the injection of ground improvement materials in pre-ground reinforcement methods during tunnel excavation. [Explanation of Symbols]

[0029] 1; Injection system for ground improvement materials 2; Tunnel 3; Unexcavated natural ground 4; Long steel pipes 7; Injection machine 8; Projection machine 17; Flow meter 18; Pressure gauge 24; Summarizing unit 25; Conversion unit

Claims

1. A ground improvement material injection system used in a construction method in which multiple long steel pipes are driven into the unexcavated ground of a tunnel, and ground improvement material is injected through the inside of the long steel pipes and into cracks in the surrounding ground by discharge holes provided on the outer circumference of the long steel pipes to reinforce the ground, An injection machine for injecting ground improvement material into the aforementioned long steel pipe, A ground improvement material injection system characterized by comprising a projector connected to the injection machine, which projects the injection information from the injection machine as image data onto the wall surface of the already excavated section of the tunnel.

2. The injection system for ground improvement material according to claim 1, characterized in that the injection information includes at least one of the amount of ground improvement material to be injected and the injection pressure.

3. The injection machine comprises a flow meter for measuring the flow rate of the ground improvement material, an integration unit for accumulating the injection amount based on the flow rate measured by the flow meter and the injection time, and a conversion unit for converting the accumulated injection amount into image data. The ground improvement material injection system according to claim 1, characterized in that the projector projects the converted image data.

4. The injection machine comprises a pressure gauge for measuring the injection pressure of the ground improvement material, and a conversion unit for converting the injection pressure measured by the pressure gauge into image data. The ground improvement material injection system according to claim 1, characterized in that the projector projects the converted image data.

Images