Liquid oxygen phase change fracturing device for tunneling

Abstract

The utility model discloses a liquid oxygen phase change fracturing device for tunneling. The liquid oxygen phase change fracturing device comprises a liquid supply device, an auxiliary device, a plurality of rock breaking pipes and an ignition device. The rock breaking pipes are placed in the drill holes correspondingly and used for liquid oxygen phase change fracturing. A liquid oxygen filling pump of the liquid supply device conveys liquid oxygen in a liquid oxygen tank into each rock breaking pipe through a flow divider; the auxiliary device is used for fixing each part of the liquid supply device at a required position, so that the injection stability is ensured; an electric ignition exciter of the ignition device controls a plurality of resistance wire ignition heads to generate electric sparks at the same time, liquid oxygen and combustible materials in the rock breaking pipe are subjected to a combustion reaction for phase change expansion fracturing, and finally a plurality of drill holes are fractured at the same time. On the premise of being small in size and convenient to install, the rock breaking efficiency can be effectively improved, and therefore the working efficiency of tunneling is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel rock crushing, in particular to a liquid oxygen phase change fracturing device used for tunnel excavation. Background Art

[0002] Currently, gas expansion fracturing technologies widely used in engineering rock crushing include carbon dioxide phase-change fracturing and liquid oxygen phase-change fracturing. Their basic principle is to generate high pressure through the rapid expansion of gas, which acts on the rock mass in a short period of time, causing it to fracture and crack. Carbon dioxide phase-change fracturing has been successfully applied in confined spaces such as coal mines and gas-rich tunnels, as well as in open-air environments. While this technology offers broad application prospects, it suffers from high rock-breaking costs and long construction times, limiting its scope of application. Liquid oxygen fracturing, on the other hand, utilizes the combustion reaction of liquid oxygen with combustibles to produce high-temperature, high-pressure carbon dioxide gas, which in turn expands the surrounding medium, producing work and fracturing the rock. While this technology offers safety and efficiency, existing liquid oxygen phase-change fracturing equipment lacks the flexibility to fracture multiple boreholes and cannot adjust the required fracturing force for each borehole, resulting in low rock-breaking efficiency and reduced tunneling efficiency. While some injection equipment can deliver liquid oxygen to multiple boreholes simultaneously, its bulk and cumbersome layout make it inconvenient for practical use.

[0003] Therefore, how to provide a device that is compact and easy to install while also effectively improving rock breaking efficiency and thus ensuring tunnel excavation efficiency is the research direction required by the present invention. Utility Model Content

[0004] In response to the problems existing in the above-mentioned prior art, the utility model provides a liquid oxygen phase change fracturing device for tunnel excavation, which is compact and easy to install, and can effectively improve the rock breaking efficiency, thereby ensuring the working efficiency of tunnel excavation.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a liquid oxygen phase change fracturing device for tunnel excavation, comprising a liquid supply device, an auxiliary device, a plurality of rock breaking tubes and an ignition device;

[0006] Multiple rock breaking pipes are placed in different boreholes for liquid oxygen phase change fracturing;

[0007] The liquid supply device includes a liquid oxygen tank, a liquid oxygen filling pump and a diverter. The diverter is provided with a liquid inlet and multiple liquid outlets, and the multiple liquid outlets are all connected to the liquid inlet; the multiple liquid outlets of the diverter are connected to the respective rock breaking pipes one by one through oxygen supply pipes; the liquid oxygen tank is connected to the liquid inlet of the diverter through the liquid oxygen filling pump and the liquid supply pipeline, and the liquid oxygen in the liquid oxygen tank is transported to the respective rock breaking pipes through the diverter by the liquid oxygen filling pump; each liquid outlet of the diverter is provided with a flow proportional valve for independently controlling the opening of each liquid outlet;

[0008] The auxiliary device includes an explosion-proof transport vehicle, a tripod, a bent hook steel bar, and a steel drill. The explosion-proof transport vehicle is used to transport the liquid oxygen tank and the liquid oxygen filling pump; the tripod is used to support the liquid supply pipeline; the steel drill is fixed to the tunnel section around the drill hole, and the bent hook steel bar is connected to the steel drill and the diverter through hooks at both ends, so that the diverter can be installed around the desired fracturing drill hole;

[0009] The ignition device includes multiple resistance wire ignition heads, wires and an electric ignition activator. Each resistance wire ignition head is located inside a rock breaking tube. One end of the wire is connected to the resistance wire ignition head, and the other end extends out of the rock breaking tube and is connected to the electric ignition activator. The electric ignition activator controls the multiple resistance wire ignition heads to generate electric sparks simultaneously. Liquid oxygen and combustible materials in the rock breaking tube undergo a combustion reaction to cause phase change, expansion and cracking, thereby simultaneously cracking multiple boreholes.

[0010] Furthermore, valves are installed on the pipeline between the liquid oxygen tank and the liquid oxygen filling pump and on the liquid supply pipeline to control the on-off of the pipeline.

[0011] Furthermore, a switching valve is included, through which the liquid supply pipeline can be connected to multiple diverters at the same time. This allows liquid oxygen to be injected into multiple different borehole groups at the same time, further improving the fracturing efficiency.

[0012] Furthermore, the liquid oxygen tank is a horizontal liquid oxygen tank made of stainless steel; the liquid oxygen filling pump is a high-pressure low-temperature liquid pump; and the liquid supply pipeline is a braided tube made of stainless steel.

[0013] Furthermore, the oxygen supply tube is made of aluminum alloy; the resistance wire ignition head is made of tungsten wire; and the electric ignition exciter is a high-energy pulse initiator.

[0014] Furthermore, the hook steel bar and the steel chisel are both made of threaded steel bars.

[0015] Furthermore, one end of the steel drill is inserted obliquely into the tunnel section, and the insertion depth is more than 1 / 2 of the total length of the steel drill, so as to ensure the connection stability between the steel drill and the tunnel section.

[0016] Compared with the prior art, the present invention adopts a combination of a liquid supply device, an auxiliary device, multiple rock-breaking tubes, and an ignition device. Through the cooperation of the liquid supply device and the multiple rock-breaking tubes, liquid oxygen can be injected into multiple boreholes simultaneously. The liquid oxygen flow rate required for each borehole can be adjusted according to the different areas and the range of cracking required for each borehole during the simultaneous injection. Finally, after the simultaneous injection is completed, the amount of liquid oxygen injected into different boreholes corresponds to the required amount. During the injection process, the auxiliary device is used to maintain the stability of the entire injection process. Finally, the ignition device is used to simultaneously cause liquid oxygen phase change cracking in each borehole, thereby achieving different cracking effects for each borehole in the same area, and different areas can also achieve corresponding single-part cracking effects, and can be carried out simultaneously, thereby improving rock-breaking efficiency and ensuring the efficiency of tunnel excavation. In addition, the present invention can also carry out rock-breaking in different areas in sequence. By arranging it multiple times on the tunnel excavation face as needed, the number of rock-breaking times can be adjusted according to engineering requirements. The number of boreholes in the rock-breaking area can be adjusted to meet the required tunnel excavation requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall layout of the utility model;

[0018] Figure 2 This is a schematic diagram of the layout of the drilling and rock breaking pipes of the utility model;

[0019] Figure 3 This is a schematic diagram of the utility model using a transfer valve for layout;

[0020] Figure 4 It is a structural diagram of the bent hook steel bar in the utility model;

[0021] Figure 5 It is a structural diagram of the steel drill in the utility model.

[0022] In the figure: 1-liquid oxygen tank, 2-liquid oxygen filling pump, 3-explosion-proof transport vehicle, 4-tripod, 5-transfer valve, 6-liquid supply pipeline, 7-diverter, 8-oxygen supply pipe, 9-rock breaking pipe, 10-bent hook steel bar, 11-steel drill, 12-drill hole, 13-resistance wire ignition head, 14-lead wire, 15-electric ignition exciter. DETAILED DESCRIPTION

[0023] The utility model will be further described below.

[0024] like Figure 1 As shown, the utility model includes a liquid supply device, an auxiliary device, a plurality of rock breaking tubes 9 and an ignition device;

[0025] The plurality of rock breaking pipes 9 are respectively placed in different boreholes 12 for liquid oxygen phase change fracturing;

[0026] The liquid supply device includes a liquid oxygen tank 1, a liquid oxygen filling pump 2 and a diverter 7. The diverter 7 is provided with a liquid inlet and multiple liquid outlets, and the multiple liquid outlets are all connected to the liquid inlet; the multiple liquid outlets of the diverter 7 are respectively connected to the respective rock breaking pipes 9 through the oxygen supply pipe 8; the liquid oxygen tank 1 is connected to the liquid inlet of the diverter 7 through the liquid oxygen filling pump 2 and the liquid supply pipeline 6, and the liquid oxygen in the liquid oxygen tank 1 is transported to the respective rock breaking pipes 9 through the diverter 7 through the liquid oxygen filling pump 2; each liquid outlet of the diverter 7 is provided with a flow proportional valve for independently controlling the opening of each liquid outlet; valves are installed on the pipeline between the liquid oxygen tank 1 and the liquid oxygen filling pump 2 and the liquid supply pipeline 6 for controlling the on-off of the pipeline.

[0027] The auxiliary device includes an explosion-proof transport vehicle 3, a tripod 4, a bent hook steel bar 10 and a steel drill 11. The explosion-proof transport vehicle 3 is used to transport the liquid oxygen tank 1 and the liquid oxygen filling pump 2; the tripod 4 is used to support the liquid supply pipeline 6; the steel drill 11 is fixed to the tunnel section around the borehole 12, and the bent hook steel bar 10 is connected to the steel drill 11 and the diverter 7 through hooks at both ends, so that the diverter 7 is installed around the desired fracturing borehole 12;

[0028] The ignition device includes multiple resistance wire ignition heads 13, wires 14 and an electric ignition exciter 15. Each resistance wire ignition head 13 is located inside a rock breaking tube 9. One end of the wire 14 is connected to the resistance wire ignition head 13, and the other end extends out of the rock breaking tube 9 and is connected to the electric ignition exciter 15. The electric ignition exciter 15 controls the multiple resistance wire ignition heads 13 to generate electric sparks at the same time. Liquid oxygen and combustibles in the rock breaking tube 9 undergo a combustion reaction to cause phase change expansion and cracking, thereby causing multiple boreholes to be cracked simultaneously.

[0029] The liquid oxygen tank 1 is a horizontal liquid oxygen tank made of stainless steel; the liquid oxygen filling pump 2 is a high-pressure low-temperature liquid pump; the liquid supply pipeline 6 is a braided stainless steel tube. The oxygen supply pipe 8 is made of aluminum alloy; the resistance wire ignition head 13 is made of tungsten wire; the electric ignition exciter 15 is a high-energy pulse initiator. Figure 4 and 5 As shown, the hook steel bar 10 and the steel chisel 11 are both made of threaded steel bars.

[0030] As an improvement of the present invention, a switching valve 5 (i.e., a multi-channel connector with a control valve) is further included, through which the liquid supply line 6 can be connected to multiple diverters 7 at the same time. Figure 3 As shown, this makes it possible to inject liquid oxygen into multiple different borehole groups simultaneously, further improving the fracturing efficiency.

[0031] As another improvement of the present invention, one end of the steel drill 11 is inserted obliquely into the tunnel section, and the insertion depth is more than 1 / 2 of the total length of the steel drill 11. This can ensure the connection stability between the steel drill 11 and the tunnel section.

[0032] The above-mentioned liquid oxygen tank 1, liquid oxygen filling pump 2, diverter 7, explosion-proof transport vehicle 3, tripod 4, transfer valve 5, rock breaking pipe 9, bent hook steel bar 10, steel drill 11, resistance wire ignition head 13 and electric ignition exciter 15 are all existing components and can be purchased on the market. The utility model only utilizes their functions.

[0033] Before fracturing, multiple boreholes 12 are constructed on the tunnel section to form a borehole group. Figure 3 As shown, after completion, the borehole group is divided into multiple fracturing areas, each area includes multiple boreholes 12, and then a diverter 7 is arranged in each area, and a rock breaking pipe 9 is placed in each borehole 12, and then each liquid outlet of the diverter 9 in each area is respectively connected to the rock breaking pipe 9 in each borehole 12 in the respective area through the oxygen supply pipe 8; each diverter 7 is installed around the corresponding area through the bending hook steel bar 10 and the steel drill 11. Finally, the explosion-proof transport vehicle 3 is controlled to stop at the appropriate position with the tunnel section, and the other components are connected; according to the required fracturing range of each fracturing area and each borehole 12 in each area, the opening of each flow proportional valve on each diverter 7 is adjusted accordingly, and then the liquid oxygen filling pump 2 is started to fill the liquid oxygen in the liquid oxygen tank 1. The liquid oxygen is simultaneously transported to each rock breaking pipe 9 through the diverter 7. Since the opening degrees of each flow proportional valve are different, the flow rate of liquid oxygen entering each borehole 12 is different when it is simultaneously input. After the required liquid oxygen injection amount is reached, each flow proportional valve is closed, and the liquid supply pipeline 6 and the switching valve 5 are disconnected from each diverter 7. The explosion-proof transport vehicle 3 is started and moved away from the tunnel section. At this time, the electric ignition exciter 15 is started to control the multiple resistance wire ignition heads 13 to generate electric sparks simultaneously. The liquid oxygen and the combustibles in the rock breaking pipe 9 undergo a combustion reaction, undergoing phase change expansion and fracturing, so that multiple boreholes 12 are fractured simultaneously. Moreover, since the amount of liquid oxygen in each borehole 12 is different, the fracturing situation can be matched to the required requirements, ultimately achieving the required fracturing effect in different areas and effectively improving the rock breaking efficiency.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A liquid oxygen phase change fracturing device for tunnel excavation, characterized in that: It includes a fluid supply device, auxiliary devices, multiple rock breaking tubes and an ignition device; Multiple rock breaking pipes are placed in different boreholes for liquid oxygen phase change fracturing; The liquid supply device includes a liquid oxygen tank, a liquid oxygen filling pump and a diverter. The diverter is provided with a liquid inlet and multiple liquid outlets, and the multiple liquid outlets are all connected to the liquid inlet; the multiple liquid outlets of the diverter are connected to the respective rock breaking pipes one by one through oxygen supply pipes; the liquid oxygen tank is connected to the liquid inlet of the diverter through the liquid oxygen filling pump and the liquid supply pipeline, and the liquid oxygen in the liquid oxygen tank is transported to the respective rock breaking pipes through the diverter by the liquid oxygen filling pump; each liquid outlet of the diverter is provided with a flow proportional valve for independently controlling the opening of each liquid outlet; The auxiliary device includes an explosion-proof transport vehicle, a tripod, a bent hook steel bar, and a steel drill. The explosion-proof transport vehicle is used to transport the liquid oxygen tank and the liquid oxygen filling pump; the tripod is used to support the liquid supply pipeline; the steel drill is fixed to the tunnel section around the drill hole, and the bent hook steel bar is connected to the steel drill and the diverter through hooks at both ends, so that the diverter can be installed around the desired fracturing drill hole; The ignition device includes multiple resistance wire ignition heads, wires and an electric ignition activator. Each resistance wire ignition head is located inside a rock breaking tube. One end of the wire is connected to the resistance wire ignition head, and the other end extends out of the rock breaking tube and is connected to the electric ignition activator. The electric ignition activator controls the multiple resistance wire ignition heads to generate electric sparks simultaneously. Liquid oxygen and combustible materials in the rock breaking tube undergo a combustion reaction to cause phase change, expansion and cracking, thereby simultaneously cracking multiple boreholes.

2. The liquid oxygen phase change fracturing device for tunnel excavation according to claim 1, characterized in that: Valves are installed on the pipeline between the liquid oxygen tank and the liquid oxygen filling pump and on the liquid supply pipeline to control the on and off of the pipeline.

3. The liquid oxygen phase change fracturing device for tunnel excavation according to claim 1, characterized in that: It also includes a transfer valve, through which the liquid supply pipeline can be connected to multiple diverters at the same time.

4. The liquid oxygen phase change fracturing device for tunnel excavation according to claim 1, characterized in that: The liquid oxygen tank is a horizontal liquid oxygen tank made of stainless steel; the liquid oxygen filling pump is a high-pressure low-temperature liquid pump; and the liquid supply pipeline is a braided tube made of stainless steel.

5. The liquid oxygen phase change fracturing device for tunnel excavation according to claim 1, characterized in that: The oxygen supply tube is made of aluminum alloy; the resistance wire ignition head is made of tungsten wire; and the electric ignition exciter is a high-energy pulse initiator.

6. The liquid oxygen phase change fracturing device for tunnel excavation according to claim 1, characterized in that: The hook steel bar and the steel chisel are both made of threaded steel bars.

7. The liquid oxygen phase change fracturing device for tunnel excavation according to claim 1, characterized in that: One end of the steel drill is obliquely inserted into the tunnel section, and the insertion depth is more than 1 / 2 of the total length of the steel drill.

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