Ground improvement material injection system

Abstract

This invention provides a ground improvement injection system that can automatically calculate the amount of ground improvement material used and the number of cans of ground improvement material deposited into the tank. [Solution] In the ground improvement material injection system, in the preliminary ground reinforcement method, the amount of ground improvement material in tanks 4A and 4B is calculated by measuring the height of the liquid level of the ground improvement material introduced into the injection machine 1 that injects the ground improvement material in the form of electronic data, the amount of ground improvement material in tanks 4A and 4B is stored as Q1 and Q2 when the injection starts and when the injection is finished, and the number of cans R of ground improvement material introduced into tanks 4A and 4B is calculated from the total amount P of ground improvement material injected.

Description

Technical Field

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

Background Art

[0002] When excavating a tunnel, so-called long steel pipe fore-piling is known, in which long steel pipes are driven into the ground ahead around the tunnel, and a ground improvement material is injected from inside 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 around the outer periphery of the tunnel. After driving the long steel pipes, the ground improvement material is injected into each long steel pipe. The ground improvement material injected into the long steel pipe penetrates into the voids and cracks in the ground around the long steel pipe through a plurality of discharge holes provided on the outer periphery of the long steel pipe and solidifies, thereby reinforcing the ground. As this ground improvement material, urethane-based ground improvement materials are widely used in terms of the improvement effect and workability. In many of these urethane-based ground improvement materials, two liquids are mixed and used, and the injection machine for the urethane-based ground improvement material is attached with two tanks for supplying the urethane-based ground improvement material.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the method of injecting a ground improvement material into the ground as in the prior art, the injection amount for each steel pipe, the total injection amount of the ground improvement material injected into all the steel pipes, the amount of the ground improvement material in the tank before the start of injection and after the completion of injection of all the steel pipes, and the number of cans of the ground improvement material put into the tank are described in the injection daily report, and the usage amount of the ground improvement material is calculated by the following calculation formula. Amount of ground improvement material used = Weight of ground improvement material in the tank before injection + (Number of cans of ground improvement material injected × amount in each can) - Weight of ground improvement material in the tank after injection is complete The number of cans of ground improvement material poured into the tank was counted visually, and the amount of ground improvement material used was manually calculated and recorded in the injection daily report, which was time-consuming and labor-intensive.

[0005] This invention has been made in view of the above-mentioned problems, and aims to provide a ground improvement material injection system that can automatically calculate the amount of ground improvement material used and the number of cans of ground improvement material put into the tank. [Means for solving the problem]

[0006] The present invention is as follows: 1. A ground improvement material injection system for 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, characterized in that the amount of ground improvement material in the tank supplied with the ground improvement material to an injection machine is calculated by measuring the height of the liquid level of the ground improvement material introduced into the tank in the form of electronic data, the amount of ground improvement material at the start and end of injection is stored, and the number of cans of ground improvement material introduced into the tank is calculated from the total amount of ground improvement material injected. 2. The ground improvement material injection system according to 1. above, comprising: a measuring unit that measures the height of the liquid level of the ground improvement material introduced into the tank in the form of electronic data; a first calculation unit that calculates the amount of ground improvement material in the tank based on the liquid level; a storage unit that stores the amount of ground improvement material when injection is started and when injection is finished; and a second calculation unit that calculates the number of cans of ground improvement material introduced into the tank from the total amount of ground improvement material injected. 3. The ground improvement material injection system according to 2. above, characterized in that it includes an entry section for recording the amount of ground improvement material stored in the memory unit and the number of cans of ground improvement material calculated by the second calculation unit in the injection daily report. [Effects of the Invention]

[0007] According to the present invention, the amount of ground improvement material in the tank is automatically calculated by measuring the liquid level of the ground improvement material in the tank in the form of electronic data. Furthermore, the amount of ground improvement material used and the number of cans of ground improvement material put into the tank are automatically calculated from the amount of ground improvement material in the tank and the total amount of ground improvement material injected into all steel pipes, thus eliminating the need for conventional visual inspection and manual calculation work. Furthermore, by automatically recording the amount of ground improvement material used and the number of cans of ground improvement material poured into the tank in the injection report, the effort of transcribing this information into a conventional injection report can be eliminated. [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 schematic diagram of an injection machine that constitutes the injection system for ground improvement material according to the embodiment. [Figure 2] This is a schematic diagram of the injection machine's tank. [Figure 3] This is a block diagram of the control unit for the injection machine. [Figure 4] This is an explanatory diagram illustrating the injection daily report according to the embodiment. [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. [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 of this embodiment is used in a pre-ground reinforcement method during tunnel excavation. As shown in Figure 5, the pre-ground reinforcement method involves driving multiple long steel pipes 32 into the unexcavated ground of the tunnel 31, and reinforcing the ground by allowing the ground improvement material to penetrate into cracks in the surrounding ground through discharge holes (not shown) provided on the outer circumference of the long steel pipes 32 via the inside of the long steel pipes 32.

[0012] In the preliminary ground reinforcement method, ground improvement material is supplied from tanks 4A and 4B to injection machine 1, which injects the ground improvement material into steel pipes 32. Urethane-based ground improvement material is widely used due to its improvement effect and ease of construction. In this case, two types of liquids A and B are mixed and injected into the ground while foaming, and the ground around the tunnel is improved as it hardens. However, inorganic ground improvement material (e.g., cement-based, water glass-based, etc.) may be used instead of urethane-based ground improvement material. For construction management purposes, injection numbers are assigned to the multiple steel pipes 32 in the order of their arrangement along the arch section.

[0013] As shown in Figure 1, this injection system includes an injection machine 1 for injecting ground improvement material into a steel pipe 32. The injection machine 1 consists of a pump unit 2 for pumping the ground improvement material, a control unit 3 to which the pump unit 2 is connected, and tanks 4A and 4B for supplying ground improvement material to the pump unit 2.

[0014] The pump unit 2 has multiple pairs of injection pumps 5A and 5B (three pairs in Figure 1) to pump and mix two types of liquids A and B for each steel pipe 32. Tank 4A into which liquid A is injected is connected to the supply port of injection pump 5A for liquid A, and tank 4B into which liquid B is injected is connected to the supply port of injection pump 5B for liquid B. In addition, a flow meter 17 (see Figure 3) for measuring the amount of ground improvement material injected is provided in the flow path downstream from the discharge ports of injection pumps 5A and 5B and is connected to the control unit 3. However, the means of measuring the amount of ground improvement material injected is not limited to the flow meter 17, and the time integral of the injection flow velocity set in the control panel 8 or the discharge flow rate per revolution and the number of revolutions of injection pumps 5A and 5B can be used.

[0015] Laser sensors are installed at the top of tanks 4A and 4B as sensors 15 to measure the distance to the liquid surface of the ground improvement material 35 (see Figure 2), and are connected to the control unit 3. However, the sensor 15 for measuring the liquid surface height of the ground improvement material 35 is not limited to laser sensors; any known technology that can measure the liquid surface height as data that can be processed for calculations, such as a float-based level sensor, can be used. In addition, during the predetermined injection of the ground improvement material, the ground improvement material is added to tanks 4A and 4B in 18-liter cans at appropriate timings before they become empty.

[0016] The control unit 3 includes a management screen 7 that displays the injection volume and injection pressure during injection, and a control panel 8 that starts, stops, and adjusts the flow rate of each pump 5A and 5B. The control panel 8 is equipped with a measuring switch 11 for measuring the distance to the liquid surface and a memory switch 12 for storing the measured distance. Furthermore, the control unit 3 includes an input unit 9, such as a touch panel, for inputting the set values ​​for the injection volume and injection pressure prior to injection.

[0017] As shown in Fig. 3, the control unit 3 includes a first measurement unit 21 that measures the height of the liquid level of the ground improvement material poured into the tanks 4A and 4B in the form of electronic data, a first calculation unit 22 that calculates the amount of the ground improvement material in the tanks 4A and 4B based on the height of the liquid level, a storage unit 23 that stores the amounts Q1 and Q2 of the ground improvement material at the start and end of injection, a second measurement unit 24 that measures the injection amount of the ground improvement material for each steel pipe 32, and a second calculation unit 25 that calculates the number of empty cans (the number of empty cans) R of the ground improvement material poured into the tanks 4A and 4B from the total injection amount P of the ground improvement material injected into all the steel pipes 32 (see Fig. 4). The second calculation unit 25 calculates the usage amount S of the ground improvement material from the amounts Q1 and Q2 of the ground improvement material stored in the storage unit 23 and the number of cans R or the total injection amount P of the ground improvement material. Further, the control unit 3 includes an entry unit 26 that enters the amounts Q1 and Q2 of the ground improvement material stored in the storage unit 23, the number of cans R of the ground improvement material calculated by the second calculation unit 25, the usage amount S, etc. into the injection daily report 27.

[0018] Note that the processing of the various processing units 21 to 26 by the control unit 3 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 a ROM and a RAM), an input / output circuit, etc. as the center, and peripheral circuits such as an input / output interface.

[0019] Next, the operation and effect of the ground improvement material injection system with the above configuration will be described. Before starting the injection of the ground improvement material, turn on the measurement switch 11 of the control panel 8 of the injector 1, and measure the height of the liquid level of the ground improvement material in the two tanks 4A and 4B with the sensor 15. The measured data is sent to the first calculation unit 22. The first calculation unit 22 calculates the volume of each ground improvement material in each tank 4A and 4B, and further calculates the weight by multiplying the specific gravity of each ground improvement material. The calculated weights of each ground improvement material are displayed on the management screen 7 of the control unit 3. Next, turn on the storage switch 12 of the control panel 8, and store the weights of each ground improvement material displayed on the management screen 7 in the storage unit 23. The numerical value measured before this injection start is called the remaining amount Q1 before injection. Note that the timing for calculating and storing the remaining amount Q1 before injection is not particularly limited as long as it is before the injection start.

[0020] After memorizing the residual quantity Q1 before injection and then starting the predetermined injection of the ground improvement material, the second measurement unit 24 measures the injection quantity of the ground improvement material into each steel pipe 32. Then, when the predetermined injection of the ground improvement material is completed, the measurement switch 11 on the control panel 8 of the injector 1 is turned on again, and the height of the liquid surface of the ground improvement material in the two tanks 4A and 4B is measured by the sensor 15. The measured data is sent to the first calculation unit 22. The first calculation unit 22 calculates the volume of the ground improvement material in each of the tanks 4A and 4B, and further calculates the weight by multiplying the specific gravity of each ground improvement material. The calculated weights of the ground improvement materials are displayed on the management screen 7. Next, the storage switch 12 on the control panel 8 is turned on, and the weights of the ground improvement materials displayed on the management screen 7 are stored in the storage unit 23. The numerical values measured after the end of this injection are called the residual quantity Q2 after injection. Note that the timing for calculating and memorizing the residual quantity Q1 before injection is not particularly limited as long as it is after the end of injection.

[0021] The storage unit 23 stores both the residual quantity Q1 before injection and the residual quantity Q2 after injection. By pressing the total button 13 (see FIG. 1) on the control panel 8 of the injector 1, the second measurement unit 24 calculates the total injection quantity P obtained by summing the injection quantities for each injection location (i.e., the steel pipe 32) and sends it to the second calculation unit 25. The second calculation unit 25 calculates the number of cans R by dividing the total injection quantity P of the ground improvement material by the can entry (for example, 18 kg, 20 kg, etc.). At the same time, the second calculation unit 25 calculates the usage quantity S of the ground improvement material from the residual quantity Q1 before injection, the residual quantity Q2 after injection, the calculated number of cans R, or the total injection quantity P stored in the storage unit 23 according to the following formula (1) or (2). (1) Usage quantity S = Residual quantity Q1 before injection + (Number of cans R × Can entry) - Residual quantity Q2 after injection (2) Usage quantity S = Residual quantity Q1 before injection + Total injection quantity P - Residual quantity Q2 after injection Note that the usage quantity S of the ground improvement material includes, for example, the discarded quantity for confirming the presence or absence of clogging in the normal injection hose, and is a value larger than the total injection quantity P of the ground improvement material.

[0022] In the recording unit 26, the remaining amounts Q1 before injection and Q2 after injection of tanks 4A and 4B, which are stored in the memory unit 23, along with the calculated total injection amount P, number of cans R, and amount used S of the ground improvement material, are entered into the injection daily report 27 (see Figure 4). The injection daily report (i.e., image data) 27, which contains the total injection amount P, remaining amount Q1 before injection, remaining amount Q2 after injection, number of cans R, and amount used S of the ground improvement material, is used via wired or wireless communication or a recording medium such as a USB memory.

[0023] Based on the above, according to the ground improvement material injection system or injection method of this embodiment, in a construction method in which a plurality of long steel pipes 32 are driven into the unexcavated ground of the tunnel 31, and ground improvement material is injected through the inside of the long steel pipes 32 and into cracks in the surrounding ground from discharge holes provided on the outer circumference of the long steel pipes 32 to reinforce the ground, the amount of ground improvement material in tanks 4A and 4B is calculated by measuring the height of the liquid level of the ground improvement material introduced into tanks 4A and 4B that supply the ground improvement material to the injection machine 1 that injects the ground improvement material, in the form of electronic data, the amount of ground improvement material in tanks 4A and 4B is calculated, the amount of ground improvement material Q1 and Q2 at the start and end of injection is stored, and the number of cans R of ground improvement material introduced into tanks 4A and 4B is calculated from the total amount P of ground improvement material injected. By measuring the liquid level of the ground improvement material in tanks 4A and 4B, which supply the ground improvement material, in electronic data format, the amounts of ground improvement material Q1 and Q2 in tanks 4A and 4B are automatically calculated. Furthermore, the amount of ground improvement material used S and the number of cans R of ground improvement material put into tanks 4A and 4B are automatically calculated from the amounts of ground improvement material Q1 and Q2 in tanks 4A and 4B and the total amount P of ground improvement material injected into all steel pipes 32. This eliminates the need for conventional visual inspection and manual calculation. Furthermore, by automatically recording the amount of ground improvement material used S and the number of cans R of ground improvement material poured into tanks 4A and 4B in the injection daily report 27, the effort of transcribing this information into the conventional injection daily report can be eliminated.

[0024] 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 embodiments, the total amount of soil improvement material P injected is calculated after calculating the remaining amount Q2 in tanks 4A and 4B after injection, but the invention is not limited to this, and for example, a form in which the remaining amount Q2 in tanks 4A and 4B after injection is calculated after calculating the total amount of soil improvement material P may be adopted.

[0025] Furthermore, while the above embodiment illustrates an injection system in which each processing unit 21 to 26 is provided in the control unit 3 of the injection machine 1, an injection system may also be adopted in which each processing unit 21 to 26 is provided in a terminal (for example, a mobile terminal such as a smartphone, or a personal computer) that can be connected to the control unit 3 of the injection machine 1.

[0026] 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]

[0027] 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]

[0028] 1; Injector 4A, 4B; Tank 21; 1st measurement section (measurement section) 22; 1st calculation section 23;Storage unit 25;Second calculation unit 26; Entry Section 27; Injection Daily Report 31; Tunnel 32; Steel pipe P; Total amount of ground improvement material injected Q1; Remaining amount in the tank before injection (amount of ground improvement material) Q2; Amount remaining in the tank after injection (amount of ground improvement material) R; Number of cans of ground improvement material added to the tank S; Amount of ground improvement material used

Claims

1. A ground improvement material injection system for 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, characterized in that the amount of ground improvement material in the tank supplied with the ground improvement material to an injection machine is calculated by measuring the height of the liquid level of the ground improvement material introduced into the tank in the form of electronic data, the amount of ground improvement material at the start and end of injection is stored, and the number of cans of ground improvement material introduced into the tank is calculated from the total amount of ground improvement material injected.

2. The ground improvement material injection system according to claim 1, comprising: a measuring unit that measures the height of the liquid level of the ground improvement material introduced into the tank in the form of electronic data; a first calculation unit that calculates the amount of ground improvement material in the tank based on the liquid level; a storage unit that stores the amount of ground improvement material when injection is started and when injection is finished; and a second calculation unit that calculates the number of cans of ground improvement material introduced into the tank from the total amount of ground improvement material injected.

3. The ground improvement material injection system according to claim 2, further comprising an entry section for recording the amount of ground improvement material stored in the memory section and the number of cans of ground improvement material calculated by the second calculation section in the injection daily report.

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