Injection nozzle unit and injection management system

Abstract

To simplify pipe connector connection work at a construction site when filling a cavity formed in the natural ground behind a concrete structure with a foaming injection material.SOLUTION: In order to fill a cavity 4 behind a concrete structure 1 with a foaming injection material 5, an injection nozzle unit 30 is prepared. An A-liquid pipe part 33 and a B-liquid pipe part 34 are branched from an air introduction port 31 of the injection nozzle unit 30. An A-liquid introduction port 35 is provided in the middle part of the A-liquid pipe part 33, and a B-liquid introduction port 36 is provided in the middle part of the B-liquid pipe part 34. Downstream ends of the A-liquid pipe part 33 and the B-liquid pipe part 34 are connected to each other at a confluence part 40. A discharge nozzle 41 is extended from the confluence part 40. A digital pressure gauge 50 is provided on the A-liquid pipe part 33, the B-liquid pipe part 34, or the discharge nozzle 41.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an injection nozzle unit and injection management system that inject a two-component foamable injection material into the ground, and in particular to an injection nozzle unit and injection management system that are suitable for backfilling injection material into cavities behind tunnel linings. [Background technology]

[0002] Cavities may form in the ground behind the tunnel lining. If a cavity is found during tunnel maintenance inspection, it is repaired by backfilling the cavity with grout. For example, a two-part foaming grout consisting of liquid A and liquid B is used as the grout. Generally, polyol is used as liquid A, and polyisocyanate is used as liquid B.

[0003] The injection system for the foamable injection material has a compressed air pipe from an air compressor branched into two via a three-way branch connector, one branch air pipe merges with a liquid A pipe via a merging connector, and the other branch air pipe merges with a liquid B pipe via another merging connector. Furthermore, the liquid A pipe and the liquid B pipe merge, and an injection nozzle extends from there. Liquid A and liquid B are mixed with compressed air and then discharged from the injection nozzle while being mixed and stirred together. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4909444 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional injection system, there were five connections that had to be made at the construction site: three connections at the three-way branch connector of the compressed air pipe and two merging connectors. This made the connection work time-consuming. Furthermore, for example, when connecting one of the two branch air pipes extending from the three-way branch connector to the A liquid merging connector, the movable range of the B liquid merging connector was limited by the length of the one branch air pipe, making it difficult to connect the B liquid merging connector to the other branch air pipe.

[0006] Furthermore, whether or not the backfill material had been filled into the cavity behind the tunnel lining was confirmed using a pressure gauge installed in the injection system, but this required workers to set up scaffolding inside the tunnel and visually check, which was not only cumbersome but also made work management difficult. In view of the above circumstances, the present invention aims to reduce the complexity of connector connection at the construction site when filling a two-component foaming injection material into a cavity formed in the ground behind a concrete structure such as a tunnel lining. The second objective is to simplify the management of the work status to determine whether the backfill material has been filled into the cavity. [Means for solving the problem]

[0007] In order to solve the first problem, the injection nozzle unit according to the present invention is an injection nozzle unit for filling a foamable injection material consisting of a liquid A mainly composed of a polyol and a liquid B mainly composed of a polyisocyanate into a cavity formed in the natural ground behind a concrete structure, an air introduction port connected to the tip of the air supply pipe; a liquid A pipe section and a liquid B pipe section branched from the air introduction port; a liquid A introduction port provided in an intermediate portion of the liquid A pipe portion and connected to a liquid A supply pipe; a liquid B introduction port provided in an intermediate portion of the liquid B pipe portion and connected to a liquid B supply pipe; a confluence portion where downstream ends of the liquid A pipe portion and the liquid B pipe portion are connected to each other; a discharge nozzle extending from the confluence; a pressure gauge provided in the A liquid pipe section, the B liquid pipe section, or the discharge nozzle; It is equipped with:

[0008] Preferably, the pressure gauge is a digital pressure gauge capable of outputting detected pressure information via a wired or wireless connection.

[0009] In order to solve the second problem, the infusion management system according to the present invention comprises: the injection nozzle unit; a receiving unit that receives pressure information from the digital pressure gauge of the injection nozzle unit; a storage unit that stores the received pressure information; a display unit that displays the pressure information; The present invention is characterized by the following. [Effects of the Invention]

[0010] According to the present invention, when a foam injection material is filled into a cavity formed in the natural ground behind a concrete structure, the complexity of connecting connectors at the construction site can be reduced. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is an explanatory diagram showing the backfilling work on the rear surface of a tunnel lining using a repair system including an injection management system according to one embodiment of the present invention. [Figure 2] FIG. 2 is a side view of the injection nozzle unit in the injection management system. [Figure 3] FIG. 3 is a block diagram showing a schematic configuration of the injection management system. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a concrete structure repair system 10. The concrete structure to be repaired in this embodiment is a New Austrian Tunneling Method (NATM) tunnel 1. A cavity 4 has been formed in the natural ground 2 behind the lining 3 of the NATM tunnel 1. The repair system 10 backfills the cavity 4 with a foamable injection material 5. The foamable injection material 5 is composed of a liquid A whose main component is polyol and a liquid B whose main component is polyisocyanate.

[0013] As shown in FIG. 1, repair system 10 includes injection machine 13, compressor 14 (compressed air source), injection nozzle unit 30, and injection management device 60. Injector 13 includes control panel 13a, liquid A pressure pump 13p, and liquid B pressure pump 13q. Liquid A supply tank 11 is connected to liquid A pressure pump 13p, and liquid B supply tank 12 is connected to liquid B pressure pump 13q. Liquid A supply pipe 21 extends from liquid A pressure pump 13p to injection nozzle unit 30. One-touch female connector 21c is provided at the tip of liquid A supply pipe 21. Liquid B supply pipe 22 extends from liquid B pressure pump 13q to injection nozzle unit 30. One-touch female connector 22c is provided at the tip of liquid B supply pipe 22.

[0014] As shown in Figure 1, an air supply pipe 24 extends from the compressor 14 to the injection nozzle unit 30. A one-touch female connector 24c is provided at the tip of the air supply pipe 24. Preferably, the supply tanks 11, 12, the injection machine 13, and the compressor 14 are mounted on a work vehicle 15.

[0015] As shown in Figure 2, the injection nozzle unit 30 includes an air introduction port 31, a liquid A pipe section 33, a liquid B pipe section 34, and a discharge nozzle 41. The air introduction port 31 includes a one-touch male connector 31c. The male connector 31c can be connected to the female connector 24c at the tip of the air supply pipe 24 with a single touch. That is, by inserting the male connector 31c straight into the female connector 24c, the connectors 31c and 24c are connected in a locked state and the female connector 24c is opened. By operating to release the lock on the female connector 24c, the connectors 31c and 24c can be separated from each other and the female connector 24c is closed.

[0016] A liquid A pipe section 33 and a liquid B pipe section 34 branch off from the air introduction port 31. The liquid A pipe section 33 and the liquid B pipe section 34 extend parallel to each other.

[0017] The liquid A pipe section 33 is provided with an open / close valve 33v, a liquid A introduction port 35, and a digital pressure gauge 50, in this order from the air introduction port 31 side. The liquid A introduction port 35 is provided in an intermediate section of the liquid A pipe section 33. The liquid A supply pipe 21 is connected to the liquid A introduction port 35. The liquid A introduction port 35 includes a one-touch male connector 35c. The male connector 35c can be connected to the female connector 21c at the tip of the liquid A supply pipe 21 with a single touch. That is, by inserting the male connector 35c straight into the female connector 21c, the connectors 35c, 21c are connected in a locked state and the female connector 21c is opened. By operating to release the lock on the female connector 21c, the connectors 35c, 21c can be separated from each other and the female connector 21c is closed.

[0018] A digital pressure gauge 50 is provided in the liquid A pipe section 33 downstream of the liquid A introduction port 35 (towards the confluence section 40). The digital pressure gauge 50 includes a piezoelectric conversion element 51 and an output section 52. The piezoelectric conversion element 51 generates an electric signal corresponding to the fluid pressure. The piezoelectric conversion element 51 may include a pressure sensing element such as a diaphragm. The pressure sensing element may be distorted or deformed in response to the fluid pressure, and an electric signal corresponding to the amount of deformation may be generated. The output section 52 outputs the generated electric signal. The output section 52 may include an electric signal amplifier or signal converter. One end of an output line 53 is connected to the output section 52.

[0019] The liquid B pipe section 34 is provided with an open / close valve 34v and a liquid B introduction port 36 in this order from the air introduction port 31 side. The liquid B introduction port 36 is provided in the middle of the liquid B pipe section 34. The liquid B introduction port 36 is connected to the liquid B supply pipe 22. The liquid B introduction port 36 includes a one-touch male connector 36c. The male connector 36c can be connected with the female connector 22c at the tip of the liquid B supply pipe 22 with one touch. That is, by inserting the male connector 36c straight into the female connector 22c, the connectors 36c, 22c are connected in a locked state and the female connector 22c is opened. By operating to release the lock on the female connector 22c, the connectors 36c, 22c can be separated from each other and the female connector 22c is closed.

[0020] The downstream ends of the liquid A pipe section 33 and the liquid B pipe section 34 are connected to each other to form the confluence section 40. The portion of the liquid A pipe section 33 near its downstream end is bent at a right angle and connected to the confluence section 40. A discharge nozzle 41 extends from the confluence 40. The discharge nozzle 41 is aligned with the liquid B pipe 34.

[0021] As shown in FIG. 3, an output line 53 from the pressure gauge 50 extends to an infusion management device 60. Injection management device 60 is configured by a portable computer such as a laptop, tablet, or smartphone, but is not limited to these and may also be a desktop computer, a server computer, cloud computing, etc. Injection management system 9 includes a CPU 61, a receiving unit 62, a memory unit 63, and a display unit 64 (monitor).

[0022] The CPU 61 executes an injection management program. The receiving unit 62 is connected to the output line 53 and receives pressure information from the digital pressure gauge 50. The receiving unit 62 may include a signal conversion unit. The storage unit 63 stores the received pressure information. The pressure information and the like are displayed on the display unit 64. Preferably, by selecting a menu, it is possible to display the received real-time pressure information, or to edit and display the pressure information accumulated in the storage unit 63. The pressure information may be displayed numerically or in a diagram such as a graph. The injection nozzle unit 30 including the pressure gauge 50 and the injection management device 60 constitute an injection management system 9.

[0023] The repair system 10 is used as follows. As shown in FIG. 1, when a cavity 4 is found during maintenance and inspection of a tunnel 1, a hole 3c is drilled in the tunnel lining 3 so as to connect to the cavity 4.

[0024] The air supply pipe 24, the liquid A supply pipe 21, and the liquid B supply pipe 22 are connected to the injection nozzle unit 30 of the repair system 10. That is, as shown in FIG. 2, the one-touch female connector 24c at the tip of the air supply pipe 24 is connected to the one-touch male connector 31c of the air inlet port 31 of the injection nozzle unit 30, the one-touch female connector 21c at the tip of the liquid A supply pipe 21 is connected to the one-touch male connector 35c of the liquid A inlet port 35, and the one-touch female connector 22c at the tip of the liquid B supply pipe 22 is connected to the one-touch male connector 36c of the liquid B inlet port 36. These connectors are connected by a simple insertion operation, which simplifies the connection process and reduces the likelihood of connection failure. Furthermore, because only three one-touch connections are required, the connection process can be completed in a short time.

[0025] The injection nozzle unit 30 itself is an integrated unit, and does not require assembly at the construction site. Therefore, for example, when one of the two pipe sections 33, 34 is connected to the discharge nozzle 41, problems such as difficulty in connecting the other pipe section to the discharge nozzle 41 do not occur.

[0026] After the above-described injection preparation work, as shown in Figure 1, discharge nozzle 41 is inserted into hole 3c so as to face cavity 4. Then, on-off valves 33v and 34v are opened, and compressed air is introduced from air supply pipe 24 into air inlet port 31 of injection nozzle unit 30 by operating compressor 14, and liquid A and liquid B are introduced from supply pipes 21 and 22 into inlet ports 35 and 36, respectively, by operating pressure pumps 13p and 13q.

[0027] The compressed air is divided from an air inlet port 31 into a liquid A pipe section 33 and a liquid B pipe section 34. Liquid A is joined to the compressed air flowing through the liquid A pipe section 33 at an inlet port 35. Liquid B is joined to the compressed air flowing through the liquid B pipe section 34 at an inlet port 36. Furthermore, the air containing liquid A and the air containing liquid B are joined at a joining section 40. As a result, the liquids A and B are mixed and stirred in the discharge nozzle 41 and injected into the cavity 4 from the tip of the discharge nozzle 41 . Then, a foaming reaction occurs between liquids A and B in cavity 4, producing foamable injection material 5. The expansion ratio is preferably 6 times or more, more preferably 6 to 50 times, and even more preferably about 20 times. The foamable injection material 5 is filled into cavity 4.

[0028] During the injection process, the internal pressure of the liquid A pipe section 33 is detected by the pressure gauge 50. Consequently, the injection pressure of the foamable injection material 5 in the cavity 4 is detected. The detection signal from the pressure gauge 50 is received by the receiving unit 62 of the injection management device 60 via the output line 53, and is displayed in real time on the display unit 64 as the current value of the injection pressure (pressure information), and is also stored in the memory unit 63 as data on the change in the injection pressure over time (pressure information).

[0029] The worker or work manager can monitor the injection pressure in real time using the value displayed on the display unit 64 and determine whether the foamable injection material 5 has been filled into the cavity 4. There is no need to directly monitor the pressure gauge 50. Therefore, there is no need to set up scaffolding inside the tunnel 1 just for pressure monitoring. The injection nozzle unit 30 including the pressure gauge 50 serves as an injection pressure sensing probe in the injection management system 9 .

[0030] When the injection pressure display value on display unit 64 exceeds a predetermined value, it can be determined that filling of foamable injection material 5 is complete. Then, open / close valves 33v and 34v are closed, injection nozzle unit 30 is pulled out from hole 3c, and pumps 13p and 13q and compressor 14 are stopped. Thereafter, the hole 3c is sealed. In this way, repairs can be made to the rear of the tunnel.

[0031] The pressure information stored in the memory unit 63 can be displayed as a graph or table showing the change in injection pressure over time, or the final injection pressure can be extracted and displayed, making it possible to use it for creating work reports such as daily reports and for work management. This eliminates the need for workers to record or take photos of the pressure readings on the pressure gauge itself during injection work, eliminating recording errors and omissions, and improving the reliability of work management.

[0032] 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 repair target in the embodiment was a NATM tunnel, but the present invention is not limited to this and can be applied to repair various concrete structures such as dams, retaining walls, shield tunnels, tunnels, conduits, and waterways by filling cavities formed in the ground behind them with injection material. The digital pressure gauge 50 may be provided in the liquid B pipe section 34 (preferably the section between the liquid B introduction port 36 and the confluence section 40) or in the discharge nozzle 41. Output unit 52 of digital pressure gauge 50 may have a wireless function for wirelessly outputting the detected pressure value. Digital pressure gauge 50 and receiving unit 62 of injection management device 60 may be wirelessly connected. When the injection management system 9 is not constructed by combining the injection nozzle unit 30 and the injection management device 60, the pressure gauge may be an analog pressure gauge. The one-touch connector at the tip of the air supply tube 24 may be male, and the one-touch connector at the air introduction port 31 may be female. The one-touch connector at the tip of the liquid A supply pipe 21 may be male, and the one-touch connector of the liquid A introduction port 35 may be female. The one-touch connector at the tip of the B liquid supply pipe 22 may be male, and the one-touch connector of the B liquid introduction port 36 may be female. [Industrial Applicability]

[0033] The invention is applicable, for example, to repair cavities behind tunnel linings. [Explanation of symbols]

[0034] 1 NATM tunnel (concrete structure) 2. Ground 3 Lining 3c hole 4 cavities 5. Foam injection material 9 Infusion Management System 10 Repair System 11 A liquid supply tank 12 B liquid supply tank 13 Injection machine 13p A liquid pressure pump 13q B liquid pressure pump 14 Compressor (air compressor) 21 A liquid supply pipe 22 B liquid supply pipe 24 Air supply pipe 30 Injection nozzle unit 31 Air intake port 33 A liquid pipe section 34 B liquid pipe section 35 Inlet port for A liquid 36 B liquid introduction port 40 Junction 41 Discharge nozzle 50 Digital pressure gauge (pressure gauge) 51 Piezoelectric transducer 53 Output line 60 Injection control device (PC) 61 CPU 62 Receiving unit 63 Memory section 64 Display section

Claims

1. An injection nozzle unit for filling a foaming injection material consisting of a liquid A mainly composed of a polyol and a liquid B mainly composed of a polyisocyanate into a cavity formed in the ground behind a concrete structure, an air introduction port connected to the tip of the air supply pipe; a liquid A pipe section and a liquid B pipe section branched from the air introduction port; a liquid A introduction port provided in an intermediate portion of the liquid A pipe portion and connected to a liquid A supply pipe; a liquid B introduction port provided in an intermediate portion of the liquid B pipe portion and connected to a liquid B supply pipe; a confluence portion where downstream ends of the liquid A pipe portion and the liquid B pipe portion are connected to each other; a discharge nozzle extending from the confluence; a pressure gauge provided in the A liquid pipe section, the B liquid pipe section, or the discharge nozzle; wherein the A liquid supply pipe and the A liquid introduction port can be connected in one touch by a female connector provided on one of the A liquid supply pipe and the A liquid introduction port and a male connector provided on the other of the A liquid supply pipe and the A liquid introduction port, the B liquid supply pipe and the B liquid introduction port can be connected with one touch by a female connector provided on one of the B liquid supply pipe and the B liquid introduction port and a male connector provided on the other of the B liquid supply pipe and the B liquid introduction port, the air supply pipe and the air introduction port can be connected with one touch by a female connector provided on one of the air supply pipe and the air introduction port and a male connector provided on the other of the air supply pipe and the air introduction port, The injection nozzle unit is characterized in that the one-touch connection is a connection method in which the male connector is inserted straight into the female connector, preventing the male and female connectors from coming loose and connecting them, and the female connector is opened, and the female connector is separated from the male connector by releasing the lock, thereby closing the female connector.

2. 2. The injection nozzle unit according to claim 1, wherein the pressure gauge is a digital pressure gauge capable of outputting detected pressure information via wire or wirelessly.

3. The injection nozzle unit according to claim 2; a receiving unit that receives pressure information from the digital pressure gauge of the injection nozzle unit; a storage unit that stores the received pressure information; a display unit that displays the pressure information; An infusion management system comprising:

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