A method for underwater blasting through clay layer

Abstract

The present application relates to the technical field of underwater blasting construction, and proposes a method for underwater blasting through a clay layer. When drilling a blasthole, the present application first uses a geological drill to coring the clay layer in the casing, and then uses a down-the-hole drill to drill the blasthole on the reef, thereby reducing the situation of poor slag discharge or even drill jamming when the down-the-hole drill drills the clay layer in the casing, and the present application has the effect of improving the efficiency of underwater blasting construction.

Description

Technical Field

[0001] The present application relates to the technical field of underwater blasting construction, and in particular to a method for underwater blasting through a clay layer. Background Art

[0002] At present, when carrying out underwater reef blasting construction, it is usually necessary to first drill blast holes on the reef using a down-the-hole drill on a blasting ship, then fill the blast holes with explosives, and then detonate the explosives to achieve underwater reef blasting construction.

[0003] As the upper part of underwater reefs is usually covered with a thick clay layer, in order to reduce the clay from the clay layer flowing into the blasthole after the DTH drill is lifted, during the drilling construction, it is necessary to insert the casing into the clay layer before drilling the blasthole. The end of the casing close to the clay layer needs to be processed into a flower tube shape (with several discharge holes on the outer periphery of the casing) to facilitate the exhaust and slag discharge of the DTH drill.

[0004] During actual drilling construction, the down-the-hole drill needs to first drill out the clay layer in the casing before drilling blastholes on the reef; when the down-the-hole drill drill drills the clay layer, the drilled debris (mainly clay with poor fluidity) is usually blown out of the discharge hole of the casing by high-pressure gas from the bottom of the down-the-hole drill rod. Since the clay itself has extremely poor fluidity, most of the clay is easy to adhere to the inner periphery of the casing and easily block the discharge holes on the outer periphery of the casing, resulting in difficulty in subsequent slag discharge by the down-the-hole drill and even prone to drill jamming, which seriously affects the subsequent drilling of blastholes on the reef by the down-the-hole drill and affects the overall construction progress of underwater blasting. Summary of the invention

[0005] In order to make underwater reef blasting construction simpler and more convenient, the present application provides a method for underwater blasting through a clay layer.

[0006] The present application provides a method for underwater blasting through a clay layer, which adopts the following technical solution:

[0007] A method for underwater blasting through a clay layer comprises the following steps:

[0008] S1: Processing of blasting charge: prefabricate the connecting pipe, tie several explosive rolls on the connecting pipe, and bury the detonator in the explosive rolls;

[0009] S2: construct a cantilever construction platform on one side of the reef blasting vessel, on which a down-the-hole drill and a geological drill are installed, and a coring drill rod is installed at the output end of the geological drill;

[0010] S3: Move the reef blasting boat to the designated location and fix the position;

[0011] S4: Insert the casing until it passes through the clay layer and abuts against the reef;

[0012] S5: coring the clay layer in the casing by means of a geological drill;

[0013] S6: Drilling blastholes on the reef at the bottom of the casing by a down-the-hole drill;

[0014] S7: Blast hole charging: insert blasting charge into the blast hole;

[0015] S8: pulling the casing out of the clay layer;

[0016] S9: repeating steps S3 to S8 until the drilling and charging of the remaining blastholes are completed;

[0017] S10: Connect the detonator wire to the initiator;

[0018] S11: Detonating the blasting charge through the detonator.

[0019] The cantilever construction platform is slidably connected to a support plate, and the cantilever construction platform is also provided with a driving component for driving the support plate to slide along the extension direction of the cantilever construction platform. The geological drill rig and the down-the-hole drill rig are installed on the support plate and are evenly distributed along the extension direction of the support plate; the support plate is provided with a main through hole for the coring drill rod of the geological drill rig to pass through and a secondary through hole for the down-the-hole drill rod of the down-the-hole drill rig to pass through.

[0020] By adopting the above technical scheme, when the present application performs underwater construction blasting, after the casing is driven into the clay layer, the driving assembly is used to drive the support plate to slide until the coring drill rod of the geological drill rig is opposite to the top of the casing, and the coring drill bit of the geological drill rig is used to coring the clay layer in the casing to achieve rapid removal of the clay layer in the casing; then the driving assembly is used to drive the support plate to slide until the down-the-hole drill rod of the down-the-hole drill rig is opposite to the top section of the casing, and the down-the-hole drill rig is used to drill blast holes on the reef; compared with the traditional method of drilling clay layers and reefs with down-the-hole drill rigs, this method is conducive to reducing the situation where the clay drilled out by the down-the-hole drill rig blocks the discharge holes on the outer periphery of the casing when drilling the clay layer, and is conducive to reducing the situation where the down-the-hole drill rig has poor slag discharge or even drill jamming, which is convenient for the rapid drilling of underwater reef blast holes and is conducive to improving the overall efficiency of underwater reef blasting construction.

[0021] Preferably, a limiting hole for the casing to pass through is opened at the cantilever end of the cantilever construction platform, and the limiting hole, the main through hole and the auxiliary through hole are axially parallel.

[0022] By adopting the above technical solution and setting the limiting holes, when installing the casing, the casing is inserted into the limiting holes and then driven into the clay layer, so that the casing can be limited by the limiting holes, so that the casing is not easily offset during the subsequent construction process.

[0023] Preferably, the driving assembly includes a reaction seat for fixing the fixed end of the cantilever construction platform, the reaction seat is equipped with an oil cylinder, and the piston rod of the oil cylinder is connected to one end of the support plate facing the reaction seat.

[0024] By adopting the above technical solution, by driving the piston rod of the oil cylinder to extend and retract, the support plate can slide back and forth along the extension direction of the cantilever construction platform, so that the support plate can drive the down-the-hole drill rod of the down-the-hole drill or the coring drill rod of the geological drill to face the casing, which is convenient for the subsequent drilling and construction of the blasthole.

[0025] Preferably, a protective tube is coaxially sleeved on the outer circumference of the connecting tube, and the protective tube and the connecting tube are detachably connected via a main connecting assembly;

[0026] After step S1 is completed, the explosive roll and the connecting pipe are inserted into the protection pipe together, and the protection pipe and the connecting pipe are connected through the main connecting assembly;

[0027] In step S6, the protection tube, the connecting tube and the explosive roll are inserted into the blast hole together;

[0028] In step S7, the following steps are also included: removing the main connection assembly between the protection tube and the connection tube, and removing the protection tube from the blast hole.

[0029] By adopting the above technical solution, the protective tube is set up, so that the explosive roll can be wrapped and protected by the protective tube. When installing the blasting charge column in the blast hole, it is helpful to reduce the friction between the explosive roll and the rough inner wall of the blast hole, which may cause the explosive roll to be damaged and leak. By setting the main connection component, the connecting tube and the explosive roll are inserted into the protective tube, and the protective tube and the connecting tube are connected by the main connection component to realize the installation of the connecting tube and the explosive roll in the protective tube, so that the protective tube can be driven by the connecting tube and the explosive roll to be inserted into the blast hole together to realize the filling of the blast hole; then the main connection component is untied, the protective tube is separated from the connecting tube, and then the protective tube is removed from the blast hole, so as to facilitate the turnover of the protective tube.

[0030] Preferably, the main connection assembly includes a connection bolt threadedly penetrated through the top end of the protection tube, and the top end of the connection tube is provided with a through hole for the connection bolt to penetrate through.

[0031] By adopting the above technical solution, after the connecting pipe and the explosive roll are inserted into the protective pipe, the connecting pipe is moved so that the through hole is opposite to the connecting bolt, and the connecting bolt is rotated to make the connecting bolt pass into the through hole, the connecting pipe and the explosive roll can be coaxially mounted in the protective pipe, and the connecting screw is rotated to make the connecting screw disengage from the through hole, so that the protective pipe and the connecting pipe can be separated, which is convenient for removing the protective pipe from the blast hole.

[0032] Preferably, the top section of the connecting tube is coaxially sleeved with a winding wheel, and one end of the detonator's wire away from the explosive roll is wound around the winding wheel. The connecting tube is also provided with a clamping portion for limiting the downward sliding of the winding.

[0033] By adopting the above technical solution, through the setting of the winding wheel, the detonator wire can be wound and collected on the winding wheel, which is convenient for the storage and arrangement of the wire. Through the setting of the clamping part, the winding wheel is restricted from moving downward, so that the winding wheel and the wire can always be located at the top of the connecting tube, thereby facilitating the subsequent connection of the wire with the detonator.

[0034] Preferably, a secondary connection assembly is further provided between the casing and the protection tube, the secondary connection assembly comprising a plurality of main ear plates fixed at the top end of the protection tube, the main ear plates being connected to a connecting rope, a safety buckle being provided at one end of the connecting rope away from the main ear plate, the secondary connection assembly further comprising a plurality of secondary ear plates fixed at the top end of the casing, the plurality of main ear plates corresponding to the plurality of secondary ear plates one by one.

[0035] By adopting the above technical solution, before removing the casing, the end of the safety buckle away from the main ear plate is buckled on the auxiliary ear plate to achieve the connection between the casing and the protective tube. When the casing is subsequently pulled out of the clay layer, the protective tube can be taken out together, making the disassembly and assembly of the casing and the protective tube simpler and more convenient.

[0036] Preferably, the clamping portion includes a clamping bolt threadedly connected to the connecting pipe, and the bottom end of the winding wheel abuts against the clamping bolt.

[0037] By adopting the above technical solution, after the clamping bolt is screwed into the connecting tube, the winding wheel is inserted into the connecting tube until the winding wheel abuts against the clamping screw, and the clamping bolt can be used to limit the winding wheel from moving downward.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. By installing a driving platform on one side of the reef blasting ship, the driving platform is provided with a geological drill and a down-the-hole drill. When drilling blastholes, the geological drill is first used to coring the clay layer in the casing through the coring drill rod, and then the down-the-hole drill is used to drill blastholes on the reef at the bottom of the casing. This is conducive to reducing the situation where clay adheres to the inner wall of the casing and blocks the discharge hole of the casing when the down-the-hole drill is drilling the clay layer, which is convenient for the subsequent down-the-hole drill to open blastholes on the reef, which is conducive to improving the efficiency of opening blastholes.

[0040] 2. After tying the explosive roll to the connecting tube, the support rod together with the explosive roll is placed in the protective tube and the protective tube and the connecting tube are connected through the main connecting assembly. The protective tube is used to wrap and protect the explosive roll and the wire of the detonator; this helps to reduce the friction between the inner wall of the blast hole of the explosive roll and cause leakage of explosives when the connecting tube and the explosive roll pass through the casing and are placed in the casing.

[0041] 3. A secondary connection assembly is provided between the protection tube and the casing, and the secondary connection assembly includes a plurality of main ear plates fixed at the top end of the protection tube and a plurality of secondary ear plates fixed at the top end of the casing, the main ear plates are connected with connecting ropes and the connecting ropes are connected with safety buckles, before the subsequent removal of the casing, after removing the main connection assembly, the safety buckle is buckled to the corresponding secondary ear plate, so that the protection tube can be taken out together when the casing is pulled out, which is convenient for the disassembly and assembly of the protection tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram used to illustrate the connection relationship between the connecting pipe, explosive coil and protective pipe.

[0043] Figure 2 yes Figure 1 Enlarged schematic diagram of part A in the middle.

[0044] Figure 3 It is a schematic diagram of the state of the casing when it is installed in an embodiment of the present application.

[0045] Figure 4 yes Figure 3 Enlarged schematic diagram of part B in the middle.

[0046] Figure 5 It is a schematic diagram of the embodiment of the present application for illustrating the state of loading an explosive column into a blast hole.

[0047] Figure 6 yes Figure 5 Enlarged schematic diagram of part C in the middle.

[0048] Description of reference numerals:

[0049] 1. Connecting pipe; 10. Perforation; 11. Explosive coil; 111. Wire; 12. Protective tube; 13. Winding wheel; 14. Clamping bolt; 15. Connecting bolt; 2. Reef blasting vessel; 21. Cantilever construction platform; 211. Limiting hole; 22. Support plate; 221. Main through hole; 222. Auxiliary through hole; 23. Geological drilling rig; 231. Coring drill rod; 24. Down-the-hole drilling rig; 25. Driving assembly; 251. Reaction seat; 252. Cylinder; 3. Reef; 30. Blast hole; 31. Clay layer; 4. Casing; 41. Slag discharge hole; 5. Auxiliary connecting assembly; 51. Main ear plate; 52. Connecting rope; 53. Safety buckle; 54. Auxiliary ear plate. DETAILED DESCRIPTION

[0050] The following is combined with Figure 1-6 This application is described in further detail.

[0051] The present application embodiment discloses a method for underwater blasting through a clay layer, referring to Figure 1 and Figure 2 , including the following steps:

[0052] S1: Processing of blasting charge: prefabricate a connecting pipe 1, tie a number of explosive rolls 11 on the connecting pipe 1, and bury detonators in the explosive rolls 11; in this embodiment, the explosive rolls 11 are No. 2 rock emulsion explosives. After the detonators are buried in the explosive rolls 11, they are repeatedly wrapped with adhesive tape to prevent the detonators from falling off from the explosives. The sealing plugs of the detonators are sealed with butter to prevent water seepage.

[0053] A protective tube 12 is coaxially arranged on the outer periphery of the connecting tube 1, and a main connecting assembly is arranged between the connecting tube 1 and the protective tube 12. The main connecting assembly includes a connecting bolt 15 threadedly penetrated through the top end of the protective tube 12, the connecting bolt 15 is axially perpendicular to the axis of the protective tube 12, one end of the connecting bolt 15 extends into the inner cavity of the protective tube 12, and a through hole 10 for the connecting bolt 15 to penetrate is opened on the outer periphery of the top section of the connecting tube 1.

[0054] After step S1 is completed, the connecting pipe 1 and the explosive roll 11 tied to the connecting pipe 1 are inserted into the protective tube 12 together, and the connecting pipe 1 is moved so that the through hole 10 is opposite to the end of the connecting bolt 15, and the connecting bolt 15 is rotated so that the connecting bolt 15 is inserted into the through hole 10, so as to realize the connection between the protective tube 12 and the connecting pipe 1 through the main connecting assembly.

[0055] A winding wheel 13 is coaxially sleeved on the top of the connecting tube 1. A clamping piece for limiting the downward sliding of the winding wheel 13 is also provided on the top of the connecting tube 1. The wire 111 of the detonator is wound and collected on the winding wheel 13, so that the wire 111 can be stored and organized. At the same time, the end of the wire 111 away from the detonator can always be located at the top section of the connecting tube 1, which is convenient for the subsequent connection of the wire 111 with the detonator.

[0056] The clamping member includes a clamping bolt 14 vertically threadedly connected to the connecting pipe 1, and the bottom end of the winding wheel 13 abuts against the clamping bolt 14, and the clamping bolt 14 is used to limit the downward sliding of the winding wheel 13. This makes the limiting of the winding wheel 13 simpler and more convenient.

[0057] Reference Figure 3 and Figure 4 S2: A fixed cantilever construction platform 21 is installed on one side of the reef blasting vessel 2, a down-the-hole drill 24 and a geological drill 23 are installed on the cantilever construction platform 21, and a coring drill rod 231 is installed at the output end of the geological drill 23.

[0058] One end of the cantilever construction platform 21 extends out of the reef blasting ship 2 to form a cantilever end. The upper surface of the cantilever construction platform 21 is slidably connected with a support plate 22. The sliding direction of the support plate 22 is parallel to the extension direction of the cantilever construction platform 21. The cantilever construction platform 21 is also provided with a driving assembly 25 for driving the support plate 22 to slide. The down-the-hole drill 24 and the geological drill 23 are both installed and fixed on the upper surface of the support plate 22, and the down-the-hole drill 24 and the geological drill 23 are evenly distributed along the extension direction of the support plate 22. The support plate 22 is also provided with a main through hole 221 and a secondary through hole 222. The main through hole 221 is used for the coring drill rod 231 of the geological drill 23 to pass through, and the secondary through hole 222 is used for the down-the-hole drill rod of the down-the-hole drill 24 to pass through.

[0059] The cantilever construction platform 21 is further provided with a limiting hole 211 for the casing 4 to pass through, and the limiting hole 211, the main through hole 221 and the auxiliary through hole 222 are axially arranged opposite to each other.

[0060] The driving assembly 25 includes a reaction seat 251 fixed at the fixed end of the cantilever construction platform 21. The reaction seat 251 is arranged opposite to the support plate 22. Two groups of oil cylinders 252 are fixed on the side of the reaction seat 251 facing the support plate 22. The piston rod of the oil cylinder 252 is fixedly connected to the support rod. Through the above arrangement, the sliding of the support plate 22 can be achieved by driving the piston rod of the oil cylinder 252 to extend and retract.

[0061] S3: Move the reef blasting vessel 2 to the designated location and fix the position of the vessel; during actual construction, the six-cable positioning method is used to position and fix the position of the reef blasting vessel 2.

[0062] S4: insert the casing 4 until the casing 4 passes through the clay layer 31 and abuts against the reef 3. A plurality of slag discharge holes 41 are evenly opened on the outer periphery of the top of the casing 4; the specific operation steps are as follows:

[0063] S4.1: The casing 4 is lifted by the crane of the lifting ship and inserted into the limiting hole 211 of the cantilever construction platform 21. Before lifting the casing 4, a lifting ring is welded at the top end of the casing 4 for connection with the crane of the lifting ship.

[0064] S4.2: disconnect the crane from the casing 4; drive the casing 4 downward by a vibrating hammer until the bottom end of the casing 4 passes through the clay layer 31 and is pressed against the reef 3.

[0065] S5: coring the clay layer 31 by means of the geological drill 23; the specific operation steps are as follows:

[0066] S5.1: The support plate 22 is driven to slide by the driving assembly 25 until the support plate 22 slides to the point where the main through hole 221 and the top of the casing 4 face each other;

[0067] S5.2: The geological drilling rig 23 drives the coring drill rod 231 to rotate and move down into the casing 4;

[0068] S5.3: The geological drill rig 23 drives the coring drill rod 231 to move upward until the coring drill rod 231 is separated from the casing 4 , thereby coring the clay layer 31 in the casing 4 .

[0069] S6: The down-the-hole drill rig 24 drives the down-the-hole drill rod to drill a blasthole 30 on the reef 3. The specific operation steps are as follows:

[0070] S6.1: The support plate 22 is driven to slide by the driving assembly 25 until the support plate 22 slides to the point where the secondary through hole 222 and the top of the casing 4 face each other;

[0071] S6.2: The down-the-hole drill rod is driven to rotate and move down to a specified depth by the down-the-hole drill rig 24;

[0072] S6.3: The down-the-hole drill rod is driven upward by the down-the-hole drill rig 24 until the down-the-hole drill rod is separated from the casing 4;

[0073] S6.4: Clean the blast hole 30.

[0074] S7: inserting the blasting charge into the blast hole 30. The specific operation steps are as follows: move the protection tube 12, so that the protection tube 12 first penetrates the casing 4 and then lowers to the bottom of the blast hole 30, and the speed during the lowering process should not be too fast.

[0075] The provision of the protection tube 12 is helpful to reduce the possibility of damage to the explosive roll 11 and the conductor 111 due to friction between the explosive roll 11 and the wall of the blast hole 30 when the blasting charge column is lowered;

[0076] Reference Figure 3 and Figure 4 A secondary connection assembly 5 is also provided between the casing 4 and the protection tube 12; the secondary connection assembly 5 includes three sets of main ear plates 51 fixed to the top of the casing 4 and three sets of secondary ear plates 54 fixed to the top of the casing 4. The main ear plates 51 are fixed with a connecting rope 52, and a safety buckle 53 is fixed to one end of the connecting rope 52 away from the main ear plates 51.

[0077] S8: Pull out the casing 4 from the clay layer 31; the specific operation steps are as follows:

[0078] S8.1: Turn the connecting bolt 15 until the connecting bolt 15 is disengaged from the through hole 10 on the connecting pipe 1;

[0079] S8.2: buckle the safety buckle 53 onto the corresponding auxiliary ear plate 54 to achieve the connection between the casing 4 and the protection tube 12.

[0080] S8.3: Lift the casing 4 together with the protection pipe 12 by a crane until the casing 4 and the protection pipe 12 are separated from the through hole 10 on the cantilever construction platform 21 .

[0081] By setting the auxiliary connection component 5, the casing 4 and the protection tube 12 are connected through the auxiliary connection component 5, so that when the casing 4 is subsequently lifted by the crane, the casing 4 can drive the protection tube 12 to be moved out of the blast hole 30, which is convenient for the turnover use of the protection tube 12.

[0082] S9: Repeat steps S3 to S8 until the drilling and charging of the remaining blast holes 30 are completed.

[0083] S10: Connect the detonator wire 111 to the initiator.

[0084] S11: Detonating the blasting charge column by the detonator. Before blasting, the reef blasting vessel 2 needs to be moved to a safe area, and a warning area needs to be set up around the blasting area.

[0085] In the present application, when drilling the blasthole 30, the geological drill 23 on the reef blasting ship 2 takes the core of the clay layer 31 in the casing 4, and then the down-the-hole drill 24 is used to drill the blasthole 30 on the reef 3, thereby reducing the situation in which clay easily adheres to the outer periphery of the casing 4 and blocks the discharge hole of the casing 4 when drilling the clay layer 31 with a down-the-hole drill, causing the down-the-hole drill 24 to discharge slag poorly or even get stuck, thereby facilitating the opening of the blasthole 30 on the reef 3 and improving the efficiency of the underwater reef 3 blasting construction.

[0086] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for underwater blasting through a clay layer, characterized in that: The following steps are involved: S1: Processing of blasting charge: prefabricating a connecting pipe (1), tying a plurality of explosive rolls (11) on the connecting pipe (1), and burying detonators in the explosive rolls (11); S2: constructing a cantilever construction platform (21) on one side of the reef blasting vessel (2), on which a down-the-hole drill (24) and a geological drill (23) are installed, and a coring drill rod (231) is installed at the output end of the geological drill (23); S3: Move the reef blasting vessel (2) to a designated location and fix the vessel position; S4: inserting the casing (4) until the casing (4) passes through the clay layer (31) and abuts against the reef (3); S5: coring the clay layer (31) in the casing (4) by means of a geological drill (23); S6: drilling a blasthole (30) on the reef (3) at the bottom of the casing (4) by using a down-the-hole drill (24); S7: charging the blast hole (30): inserting a blasting charge column into the blast hole (30); S8: Pulling the casing (4) out of the clay layer (31); S9: repeating steps S3 to S8 until the drilling and charging of the remaining blastholes (30) are completed; S10: Connecting the detonator wire (111) to the initiator; S11: detonating the blasting charge by means of a detonator; The cantilever construction platform (21) is slidably connected to a support plate (22), and the cantilever construction platform (21) is further provided with a driving assembly (25) for driving the support plate (22) to slide along the extension direction of the cantilever construction platform (21). The geological drill (23) and the down-the-hole drill (24) are installed on the support plate (22), and the geological drill (23) and the down-the-hole drill (24) are evenly distributed along the extension direction of the support plate (22); the support plate (22) is provided with a main through hole (221) for the coring drill rod (231) of the geological drill (23) to pass through, and a secondary through hole (222) for the down-the-hole drill rod of the down-the-hole drill (24) to pass through.

2. The method for underwater blasting through clay layers according to claim 1, characterized in that: The cantilevered end of the cantilevered construction platform (21) is provided with a limiting hole (211) for the casing (4) to pass through, and the limiting hole (211), the main through hole (221) and the auxiliary through hole (222) are axially arranged in parallel.

3. The method for underwater blasting through clay layers according to claim 1, characterized in that: The driving assembly (25) comprises a reaction seat (251) for fixing the fixed end of the cantilever construction platform (21); the reaction seat (251) is provided with an oil cylinder (252); a piston rod of the oil cylinder (252) is connected to one end of the support plate (22) facing the reaction seat (251).

4. The method for underwater blasting through clay layers according to claim 1, characterized in that: A protective tube (12) is coaxially sleeved on the outer circumference of the connecting tube (1), and the protective tube (12) and the connecting tube (1) are detachably connected via a main connecting assembly; After step S1 is completed, the explosive roll (11) and the connecting pipe (1) are inserted into the protective pipe (12), and the protective pipe (12) and the connecting pipe (1) are connected through the main connecting assembly; In step S6, the protection tube (12), the connecting tube (1) and the explosive roll (11) are inserted into the blast hole (30) together; In step S7, the following steps are also included: removing the main connection assembly between the protection tube (12) and the connection tube (1), and removing the protection tube (12) from the blast hole (30).

5. The method for underwater blasting through clay layers according to claim 4, characterized in that: The main connection assembly comprises a connection bolt (15) threadedly inserted into the top end of the protection tube (12); the top end of the connection tube (1) is provided with a through hole (10) for the connection bolt (15) to pass through.

6. The method for underwater blasting through clay layers according to claim 1, characterized in that: The top section of the connecting tube (1) is coaxially sleeved with a winding wheel (13), and one end of the detonator's wire (111) away from the explosive roll (11) is wound around the winding wheel (13). The connecting tube (1) is also provided with a clamping portion for limiting the downward sliding of the winding wire.

7. The method for underwater blasting through clay layers according to claim 5, characterized in that: A secondary connection assembly (5) is also provided between the casing (4) and the protection tube (12), the secondary connection assembly (5) comprising a plurality of main ear plates (51) fixed to the top end of the protection tube (12), the main ear plates (51) being connected to a connecting rope (52), a safety buckle (53) being provided at one end of the connecting rope (52) away from the main ear plate (51), the secondary connection assembly (5) further comprising a plurality of secondary ear plates (54) fixed to the top end of the casing (4), the plurality of main ear plates (51) corresponding to the plurality of secondary ear plates (54) one by one.

8. The method for underwater blasting through clay layers according to claim 6, characterized in that: The clamping portion comprises a clamping bolt (14) threadedly connected to the connecting pipe (1), and the bottom end of the winding wheel (13) abuts against the clamping bolt (14).

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