Gas energy underwater rock breaking construction method

Abstract

The invention discloses a gas energy underwater rock breaking construction method, and belongs to the technical field of underwater rock breaking. The method comprises the steps that 1, a drilling ship is used for drilling and positioning at a construction site, and a plurality of holes are machined; 2, a pipe sleeve is placed in each hole drilled in the step 1; 3, a fracturing pipe is installed in the pipe sleeve; step 4, plugging the hole in which the fracturing pipe is mounted by using an underwater plugging device; and 5, the rock breaking network is connected, and the fracturing pipe is stimulated to complete rock breaking. The carbon dioxide gas rock breaking fracturing pipe solves the problem that a carbon dioxide gas rock breaking fracturing pipe in the prior art has the risk of early explosion, cracks generated on underwater rock are large, the rock breaking effect is good, and the fracturing pipe can be rapidly and properly placed and plugged in deep water.

Description

Technical Field

[0001] The invention relates to a gas energy underwater rock breaking construction method, belonging to the technical field of underwater rock breaking. Background Art

[0002] With the rapid development of water transport, the number of special underwater projects within close range of sensitive buildings (structures) has gradually increased. The protection of marine ecological fish is also very important. In areas where explosives are prohibited, underwater rock breaking construction mostly uses hydraulic hammer mechanical rock breaking and heavy hammer impact rock breaking methods. Compared with explosives blasting, the construction efficiency is very low and the construction cost is very high. How to safely, efficiently and economically break rocks within close range of sensitive buildings (structures) while maintaining their safety has become a difficult problem.

[0003] The existing technology applies carbon dioxide rock breaking technology underwater, by storing carbon dioxide in liquid form in a fracturing tube, then installing it in a borehole, and finally gasifying the liquid carbon dioxide through instant heating of the excitation tube, and the volume expands instantly to do work, breaking the rock. Through the application practice of multiple projects, the liquid carbon dioxide phase change expansion rock breaking construction has the remarkable characteristics of no open flame, small vibration and low pollution, enriching the technical methods of underwater building (structure) protection, environmentally friendly rock breaking, controlling the hazards of water hammer waves and seismic waves, and having a major technical breakthrough, but in the process of use, it was found that it has the following defects: 1. The carbon dioxide gas rock breaking and fracturing pipe uses a thin-walled seamless steel pipe with a thickness of 2-5 mm. Since it is used underwater, liquid carbon dioxide is pre-filled in the fracturing pipe, which poses a risk of premature explosion and a safety hazard to construction operators; 2. In the carbon dioxide gas rock-breaking and fracturing tube, the heating tube that instantly changes the phase of liquid carbon dioxide into liquid carbon dioxide uses controlled chemicals such as potassium perchlorate, which are strictly explosive substances and are not used in practice. 3. In the actual use of carbon dioxide gas for underwater rock breaking, the cracks produced by carbon dioxide on the underwater rocks are too small, and the rock breaking effect is poor, which makes it impossible for the underwater excavator to remove slag, affecting the rock breaking speed; 4. In the actual use of carbon dioxide gas underwater rock breaking, in shallow water areas, the sealing of fracture holes can be done with quick-drying solidifying agents, but below 10 meters underwater, due to water pressure, the placement and sealing of fracture pipes is the biggest problem faced.

[0004] Therefore, it is urgent to propose a gas energy underwater rock breaking construction method to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of premature explosion of the existing carbon dioxide gas rock-breaking fracturing pipe, the small cracks produced by carbon dioxide on underwater rocks, the poor rock-breaking effect, and the placement and plugging of fracturing pipes in deep water. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] The technical solution of the present invention: A gas energy underwater rock breaking construction method, comprising: Step 1: Use a drilling ship to drill holes at the construction site and process multiple holes; Step 2, placing a pipe sleeve in each hole drilled in step 1; Step 3, installing the fracturing pipe in the pipe sleeve; Step 4, using an underwater plugger to plug the hole where the fracture-causing pipe is installed; Step 5: Connect the rock breaking network and activate the fracturing pipe to complete the rock breaking.

[0007] Preferably: the fracturing tube includes an outer tube, a seamless steel tube, a liquid filling tube, an exhaust pipe, a laser ignition receiving wire and a laser ignition device, the seamless steel tube is sleeved inside the outer tube, and a vacuum layer is formed between the outer tube and the seamless steel tube, the liquid filling tube extends from the outside of the outer tube into the seamless steel tube, an exhaust pipe connected to the outside is arranged on the top of the seamless steel tube, one end of the laser ignition receiving wire is placed outside the outer tube, and the other end is placed inside the seamless steel tube, and the laser ignition receiving wire placed inside the seamless steel tube is connected to the laser ignition device.

[0008] Preferably, the seamless steel pipe is filled with oxygen-nitrogen liquid, and the oxygen-nitrogen liquid is excited by a combustion-supporting medium and a laser ignition device.

[0009] Preferably: the underwater occluder comprises an expansion material, an occluder outer membrane, a connecting ring and a one-way pressure valve, the expansion material is wrapped with the occluder outer membrane, a one-way pressure valve is installed at the closing part of the occluder outer membrane, and a connecting ring is installed on the one-way pressure valve.

[0010] Preferably: the underwater plugger is placed at the hole opening, water is injected into the outer membrane of the plugger through a one-way pressure valve, the swelling material swells when it meets water, squeezing the outer membrane of the plugger so that it is pressed tightly against the hole opening, thereby plugging the fracture tube in the hole.

[0011] Preferably, the laser ignition receiving line passes through a hole through a connecting ring and is connected to a rock breaking network.

[0012] The present invention has the following beneficial effects: 1. The gas-powered underwater rock-breaking construction method of the present invention solves the risk of premature explosion of the carbon dioxide gas rock-breaking fracturing pipe in the prior art, produces large cracks in underwater rocks, has a good rock-breaking effect, and can be quickly and properly placed and sealed in deep water.

[0013] 2. The fracturing tube of the present invention adopts a double-layer design, which is heavier than a simple seamless steel tube. It is more suitable for use in deep water when used underwater, and it is safe and portable. At the same time, the oxygen-nitrogen liquid filled inside can effectively improve the expansion and reactivity of the liquid. Liquid oxygen helps to improve the injection speed and pressure of the gas-liquid mixture, thereby forming deeper and wider cracks during the fracturing process. At the same time, the addition of liquid nitrogen helps to control the change of pressure, making the crack generation process more stable, avoiding operation failures caused by excessively high or low pressure, promoting effective cracking of the formation, and thus maintaining a safer operating environment when oxygen and nitrogen are used in combination; 3. The underwater plugging device of the present invention can solve the problem of underwater deep water plugging and also reduce the energy loss of gas energy rock breaking. It has a simple structure, ingenious design, convenient disassembly and assembly, and firm assembly, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the structure of the fracture tube; Figure 2 It is a schematic diagram of the structure of the underwater plugger; Figure 3 The invention discloses a flow chart of a gas-powered underwater rock breaking construction method.

[0015] In the figure: 1-outer tube, 2-seamless steel tube, 3-liquid filling tube, 4-exhaust pipe, 5-laser ignition receiving line, 6-laser ignition device, 7-vacuum layer, 8-expansion material, 9-outer membrane of occluder, 10-connecting ring, 11-one-way pressure valve. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0017] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection (i.e., non-detachable connection) includes but is not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but is not limited to conventional detachable methods such as threaded connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can always be found in the existing connection methods to achieve the function. Those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and hinge connection is selected for detachable connection.

[0018] Specific implementation method 1: Combination Figure 1-Figure 3 The present embodiment is described as follows. A gas energy underwater rock breaking construction method of the present embodiment comprises: Step 1: Use a drilling ship to drill holes at the construction site and process multiple holes; Step 2, placing a pipe sleeve in each hole drilled in step 1; Step 3, installing the fracturing pipe in the pipe sleeve; Step 4, using an underwater plugger to plug the hole where the fracture-causing pipe is installed; Step 5: Install the filled fracturing tube to the bottom of the hole, and reserve the excitation foot line to the outside of the hole. When plugging the hole, pay attention to the protection of the excitation foot line to avoid damaging or breaking the foot line; Step 6, connect the excitation foot lines, preferably using a series network to form a rock breaking network; Step 7: After the rock breaking network is connected, use the ohmmeter to test the resistance of the entire rock breaking network again. If the test result deviates greatly from the design result, find out the cause and solve it in time to ensure that the rock breaking network is unobstructed and the resistance value is normal; Step 8, determine the warning range and conduct warning. The warning range should be determined according to the water depth. When the water depth exceeds 4m, the warning range should be no less than 30m; when the water depth is between 2 and 4m, the warning range should be no less than 60m; when the water depth is less than 2m, the warning range should be no less than 100m.

[0019] Step 9: After the warning is completed, rock breaking should be initiated in time.

[0020] The fracturing tube includes an outer tube 1, a seamless steel tube 2, a liquid filling tube 3, an exhaust pipe 4, a laser ignition receiving wire 5 and a laser ignition device 6. The seamless steel tube 2 is installed inside the outer tube 1, and a vacuum layer 7 is formed between the outer tube 1 and the seamless steel tube 2. The liquid filling tube 3 extends from the outside of the outer tube 1 into the seamless steel tube 2. An exhaust pipe 4 connected to the outside is arranged on the top of the seamless steel tube 2. One end of the laser ignition receiving wire 5 is placed outside the outer tube 1, and the other end is placed inside the seamless steel tube 2. The laser ignition receiving wire 5 placed inside the seamless steel tube 2 is connected to the laser ignition receiving wire 5. The exhaust pipe 4 is mainly used for gasified gas discharge and is a disposable hose.

[0021] The seamless steel pipe 2 is filled with oxygen-nitrogen liquid, which is excited by a combustion-supporting medium and a laser ignition device 6. The liquid oxygen in the oxygen-nitrogen liquid is a very strong oxidant. When it comes into contact with most non-metallic organic materials and liquid oxygen, it can form a flammable or explosive system, and is highly sensitive to open flames, static electricity, impact, etc. The liquid nitrogen in the oxygen-nitrogen liquid is a stable inert gas that does not support combustion. The addition of liquid nitrogen can reduce the sensitivity of the mixture system.

[0022] The fracturing tube adopts a double-layer design, and the vacuum layer 7 adopts a vacuum design. It is heavier than a simple seamless steel tube 2. When used underwater, it is more suitable for use in deep water, and it is safe and portable. The outer tube 1 adopts heat-insulating and non-conductive materials, and the seamless steel tube 2 adopts a seamless steel tube. Oxygen and nitrogen liquid is filled in the seamless steel tube 2, and it is excited by using a combustion-supporting medium and a laser ignition device 6. A large amount of heat is generated instantly to change the phase of liquid oxygen and nitrogen, expand the volume, and crack the rock. The additional liquid filling tube 3 can solve the problem of directly filling the seamless steel tube 2 with liquid, avoiding the risk of gas explosion at any time. Secondly, the outer tube 1 can ensure that the oxygen and nitrogen liquid in the seamless steel tube 2 continues to be low temperature. Thirdly, the combustion-supporting medium and the laser ignition device 6 are used, and there are no chemical control items, which can be popularized and promoted for use.

[0023] The underwater plugger includes an expansion material 8, an occluder outer membrane 9, a connecting ring 10 and a one-way pressure valve 11. The expansion material 8 is wrapped with the occluder outer membrane 9, and the one-way pressure valve 11 is installed at the closing part of the occluder outer membrane 9, and the connecting ring 10 is installed on the one-way pressure valve 11.

[0024] The underwater plugger is placed at the hole opening, and the outer diameter of the plugger outer membrane 9 is smaller than the diameter of the hole opening. When the fracture tube reaches a predetermined depth, the one-way pressure valve 11 of the plugger is triggered, and water is injected into the outer membrane 9 of the plugger through the one-way pressure valve 11. The expansion material 8 expands when it meets water, and the expansion rate is 2-3 times, squeezing the outer membrane 9 of the plugger so that it is squeezed tightly against the hole opening, thereby plugging the fracture tube in the hole.

[0025] The expansion material 8 is made of a polyurethane material, which is a special polyurethane elastomer that can expand when in contact with moisture. The product itself and the product after reacting with groundwater are environmentally friendly and non-toxic.

[0026] The laser ignition receiving line 5 passes through the hole through the connecting ring 10 and is connected to the rock breaking network.

[0027] The underwater plugger can solve the problem of underwater deepwater plugging and reduce the energy loss of gas energy rock breaking. The existing technology uses liquid grouting to plug. First, grouting needs to wait for the slurry to solidify. Secondly, the slurry wraps the fracturing tube. When the gas energy phase changes, part of the energy is used to destroy the wrapped slurry, causing energy loss. At the same time, the underwater plugger uses a connecting ring 10 to connect the fracturing tubes in each hole through a rock breaking network.

[0028] It should be noted that in the above embodiments, as long as the technical solutions are not contradictory, they can be arranged and combined, and those skilled in the art can exhaust all possibilities based on the mathematical knowledge of arrangement and combination. Therefore, the present invention will no longer describe the technical solutions after arrangement and combination one by one, but it should be understood that the technical solutions after arrangement and combination have been disclosed by the present invention.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas energy underwater rock breaking construction method, characterized in that: include: Step 1: Use a drilling ship to drill holes at the construction site and process multiple holes; Step 2, placing a pipe sleeve in each hole drilled in step 1; Step 3, installing the fracturing pipe in the pipe sleeve; Step 4, using an underwater plugger to plug the hole where the fracture-causing pipe is installed; Step 5, install the filled fracturing tube to the bottom of the hole, and reserve the excitation foot line to the outside of the hole; Step 6, connect the excitation foot lines to form a rock breaking network; Step 7: After the rock breaking network is connected, use the ohmmeter to test the resistance of the entire rock breaking network again to ensure that the rock breaking network is unobstructed and the resistance value is normal; Step 8, determine the alert range and conduct alert; Step 9: After the alert is completed, activate rock breaking.

2. A gas energy underwater rock breaking construction method according to claim 1, characterized in that: The fracturing tube comprises an outer tube (1), a seamless steel tube (2), a liquid filling tube (3), an exhaust pipe (4), a laser ignition receiving wire (5) and a laser ignition device (6); the seamless steel tube (2) is sleeved inside the outer tube (1), and a vacuum layer (7) is formed between the outer tube (1) and the seamless steel tube (2); the liquid filling tube (3) extends from the outer side of the outer tube (1) into the seamless steel tube (2); an exhaust pipe (4) connected to the outside is arranged on the top of the seamless steel tube (2); one end of the laser ignition receiving wire (5) is arranged outside the outer tube (1), and the other end is arranged inside the seamless steel tube (2); and the laser ignition receiving wire (5) arranged inside the seamless steel tube (2) is connected to the laser ignition device (6).

3. A gas energy underwater rock breaking construction method according to claim 2, characterized in that: The seamless steel pipe (2) is filled with oxygen-nitrogen liquid, and the oxygen-nitrogen liquid is excited by using a combustion-supporting medium and a laser ignition device (6).

4. The method for underwater rock breaking using gas energy according to claim 3, characterized in that: The underwater occluder comprises an expansion material (8), an occluder outer membrane (9), a connecting ring (10) and a one-way pressure valve (11); the occluder outer membrane (9) is wrapped around the outside of the expansion material (8); a one-way pressure valve (11) is installed at the closing portion of the occluder outer membrane (9); and the connecting ring (10) is installed on the one-way pressure valve (11).

5. The method for underwater rock breaking using gas energy according to claim 4, characterized in that: The underwater plugging device is placed at the hole opening, and water is injected into the outer membrane (9) of the plugging device through a one-way pressure valve (11). The swelling material (8) swells when it encounters water, and squeezes the outer membrane (9) of the plugging device so that it is pressed tightly against the hole opening, thereby plugging the fracture tube in the hole.

6. A gas energy underwater rock breaking construction method according to claim 5, characterized in that: The laser ignition receiving line (5) passes through the hole through the connecting ring (10) and is connected to the rock breaking network.

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