CN112683118A - Construction structure and process for controlling slope gradient of underwater reef explosion slope through presplitting blasting - Google Patents
Construction structure and process for controlling slope gradient of underwater reef explosion slope through presplitting blasting Download PDFInfo
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- CN112683118A CN112683118A CN202011575814.XA CN202011575814A CN112683118A CN 112683118 A CN112683118 A CN 112683118A CN 202011575814 A CN202011575814 A CN 202011575814A CN 112683118 A CN112683118 A CN 112683118A
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Abstract
The invention relates to the technical field of offshore construction, in particular to a construction structure and a process for controlling the slope gradient of an underwater reef explosion slope through presplitting blasting. The process comprises main blast hole construction, pre-splitting hole construction, line connection operation, line connection protection and detonation. The method can effectively control the slope gradient of the underwater reef explosion foundation trench, and when the underwater foundation trench slope is constructed, the distance between the pre-splitting hole and the bottom edge line of the slope is controlled, so that the integrity of the rock mass of the slope after explosion can be achieved, the slope gradient of the design requirement can be achieved, the construction operation is simple and convenient, the reef explosion square quantity and the foundation backfill square quantity can be reduced, and the construction cost is reduced.
Description
Technical Field
The invention relates to the technical field of offshore construction, in particular to a construction structure and a process for controlling the slope gradient of an underwater reef explosion slope through presplitting blasting.
Background
The conventional reef explosion operation has low requirements on the side slope, and only the side slope is stable. A pile leg type leveling ship leveling construction process is adopted for a submerged pipe foundation trench of a great bay submarine tunnel construction project, in order to meet the requirement of leveling ship operation on the width of the foundation trench, the slope gradient of a foundation trench side slope in a reef explosion area needs to be controlled within 1:0.75 of the design gradient, and the construction requirement cannot be met by the existing construction process.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a construction structure and a process for controlling the slope gradient of an underwater reef explosion slope through presplitting blasting.
In order to achieve the purpose, the invention adopts the technical scheme that: a construction process for controlling the slope of an underwater reef explosion slope through presplitting blasting is characterized in that: the slope control adopts presplitting blasting, the position of a presplitting hole is 2.5m away from a toe line, the ultra-depth of a drill hole is 1.6m, the distance between the drill holes is 1.0m, the ultra-depth of the drill hole is 1.5m within the range that a main gun hole is 2m away from the toe line, the rest ultra-depth is 1.0m, and the distance between the drill holes is 2.5 m; filling colloid seismic charge in the main blast hole according to 60-70% of the length of the formed hole, filling emulsified phi 32 small charges in the presplitting hole, fully distributing the charges on a steel bar in a single row, and discharging the charges to the bottom of the hole; detonating the pre-split hole before the main blast hole; the method specifically comprises the following steps:
the first step is as follows: construction of main gun hole
secondly, filling colloid seismic charge in the main gun hole according to 60-70% of the length of the formed hole, and feeding the charge to the bottom of the hole according to requirements, and ensuring enough number of initiating bodies;
thirdly, connecting the main gun hole immediately after charging is finished, and detonating the main gun hole by hole-by-hole micro difference to reduce the damage to the slope rock mass;
the second step is that: pre-split hole construction
secondly, filling emulsified phi 32 small explosive cartridges in the pre-splitting holes, connecting the cartridges in series by using detonating cords, binding the cartridges on reinforcing steel bars, and detonating by using double-detonator;
thirdly, connecting the pre-split holes immediately after the pre-split holes are filled with the powder, and performing explosive alignment on the connecting lines to improve the seam forming effect of the pre-split holes;
the third step: wire connecting operation
The pre-splitting hole and the main blast hole are detonated in sections by using a connecting pipe, so that the pre-splitting hole is detonated before the main blast hole;
the fourth step: wiring protection
After the connection is finished, the construction ship slowly winches a certain distance, and after the connection is confirmed to be not scraped at the bottom of the ship, warning and removing the ship;
the fifth step: initiation of detonation
And after the ship is removed, sounding an explosion signal and detonating.
The process control is used in the case of the slope with the required gradient steeper than 1: 0.75.
The construction is carried out by firstly carrying out middle cut hole and then carrying out construction on two sides.
Each tube of the seismic charge contains 5kg of explosive, the diameter of the charge is 100mm, and the length of the charge is 53 cm.
The hole forming length is the depth of the drilled hole and the thickness of the covering layer is removed.
The pre-split hole is detonated before the main blast hole, and the method specifically comprises the following steps: and reserving 2 rows of main blast holes closest to the pre-splitting hole, and constructing according to the sequence that the pre-splitting hole firstly makes a sound in the main blast holes and then makes a sound in the main blast holes.
The construction structure for controlling the slope of the underwater reef explosion slope by presplitting blasting is characterized by comprising the following steps of: the explosive-free drilling tool comprises pre-splitting holes, main blast holes and explosives filled in the holes, wherein the positions of the pre-splitting holes are 2.5m away from a toe line, the ultra-depth of drilling holes is 1.6m, the spacing between the drilling holes is 1.0m, the ultra-depth of the drilling holes is 1.5m within the range of the main blast holes being 2m away from the toe line, the rest ultra-depth is 1.0m, and the spacing between the drilling holes is 2.5 m; filling colloid seismic charge columns in the main blast hole according to 60-70% of the length of the formed hole, filling emulsified phi 32 small charges in the presplitting hole, fully distributing the charges on a steel bar in a single row, and discharging the charges to the bottom of the hole; the pre-split hole is detonated before the main blast hole.
The pre-cracking holes are filled with small explosive strings, serially connected by using detonating cords, bound on reinforcing steel bars and detonated by using double-detonator; each tube of the seismic charge contains 5kg of explosive, the diameter of the charge is 100mm, and the length of the charge is 53 cm.
The slope is controlled using this structure with a required slope steeper than 1: 0.75.
The hole forming length is the depth of the drilled hole and the thickness of the covering layer is removed.
The method can effectively control the slope gradient of the underwater reef explosion foundation trench, and when the underwater foundation trench slope is constructed, the distance between the pre-splitting hole and the bottom edge line of the slope is controlled, so that the integrity of the rock mass of the slope after explosion can be achieved, the slope gradient of the design requirement can be achieved, the construction operation is simple and convenient, the reef explosion square quantity and the foundation backfill square quantity can be reduced, and the construction cost is reduced.
Drawings
FIG. 1 is a cross-sectional view of the present invention during its construction;
FIG. 2 is a top view of the present invention during construction;
FIG. 3 is a view of a pre-split drug string configuration (front view);
in the figure: 1-pre-splitting hole, 2-main blast hole, 3-slope toe line, 4-pre-splitting explosive string, 4-1-emulsified phi 32 small explosive cartridge, 4-2-detonating fuse and 4-3-double-detonator.
Detailed Description
The present invention will be further described with reference to the following drawings and specific embodiments, but the present invention is not limited to the specific embodiments.
Example 1
A construction process for controlling the slope of an underwater reef explosion slope through presplitting blasting is characterized in that presplitting blasting is adopted for slope control, as shown in figures 1 and 2, the distance between the positions of presplitting holes 1 and a toe line is 32.5 m, the ultra-deep of drill holes is 1.6m, the distance between the drill holes is 1.0m, the ultra-deep of drill holes is 1.5m in the range that main blast holes 2 are 32 m away from the toe line, the rest ultra-deep is 1.0m, and the distance between the drill holes is 2.5 m; filling colloid seismic charge in the main blast hole 2 according to 60-70% of the length of the formed hole, filling emulsified phi 32 small charges in the pre-split hole 1, fully distributing the charges on a steel bar in a single row, and discharging the charges to the bottom of the hole; the pre-cracked hole 1 is detonated before the main blast hole 2; the method specifically comprises the following steps:
the first step is as follows: construction of main gun hole
secondly, filling colloid seismic charge in the main gun hole 2 according to 60-70% of the length of the formed hole, and feeding the charge to the bottom of the hole according to requirements, and ensuring enough number of initiating bodies;
thirdly, connecting the main blast hole 2 immediately after charging is finished, and detonating the connection line by adopting hole-by-hole micro-difference to reduce the damage to the slope rock mass;
the second step is that: pre-split hole construction
secondly, as shown in figure 3, an emulsified phi 32 small explosive cartridge 4-1 is filled in a pre-splitting hole 1, serially connected by using an explosion wire 4-2 and bound on a reinforcing steel bar, and then is detonated by using a double-detonator 4-3;
thirdly, connecting the pre-splitting holes 1 immediately after charging is finished, and performing explosive alignment on the connecting lines to improve the seam forming effect of the pre-splitting holes;
the third step: wire connecting operation
The pre-splitting hole 1 and the main blast hole 2 are detonated in sections by using a connecting line pipe, so that the pre-splitting hole 1 is detonated before the main blast hole 2;
the fourth step: wiring protection
After the connection is finished, the construction ship slowly winches a certain distance, and after the connection is confirmed to be not scraped at the bottom of the ship, warning and removing the ship;
the fifth step: initiation of detonation
And after the ship is removed, sounding an explosion signal and detonating.
The process control is used in the case of the slope with the required gradient steeper than 1: 0.75.
The construction is carried out by firstly carrying out middle cut hole and then carrying out construction on two sides.
Each tube of the seismic charge contains 5kg of explosive, the diameter of the charge is 100mm, and the length of the charge is 53 cm.
The hole forming length is the depth of the drilled hole and the thickness of the covering layer is removed.
The pre-splitting hole 1 is initiated before the main blast hole 2, and specifically comprises the following steps: reserving 2 rows of main blast holes 2 closest to the pre-cracked hole 1, and constructing according to the sequence that the pre-cracked hole 1 firstly makes a sound in the main blast holes 2 and then makes a sound.
Example 2
The structure adopted by the construction process for controlling the slope of the underwater reef explosion slope through presplitting blasting in embodiment 1 comprises a presplitting hole 1, a main blast hole 2 and explosives filled in the holes, wherein the position of the presplitting hole 1 is 32.5 m away from a toe line, the ultra-deep drilling is 1.6m, the drilling distance is 1.0m, the ultra-deep drilling is 1.5m within the range of the main blast hole 2 being 32 m away from the toe line, the rest of the ultra-deep drilling is 1.0m, and the drilling distance is 2.5 m; the main blast hole 2 is filled with colloid seismic charge columns, the charges are charged according to 60-70% of the length of the formed hole, the charges in the pre-split holes 1 adopt emulsified phi 32 small charges, the small charges are fully distributed on a steel bar in a single row, and the charges are discharged to the bottom of the hole; the pre-cracked hole 1 is detonated before the main blast hole 2.
The pre-splitting hole 1 is filled with small explosive cartridges 4-1, serially connected by using detonating cords 4-2, bound on a reinforcing steel bar, and detonated by using double-detonator 4-3; each tube of the seismic charge contains 5kg of explosive, the diameter of the charge is 100mm, and the length of the charge is 53 cm.
The slope is controlled using this structure with a required slope steeper than 1: 0.75.
The hole forming length is the depth of the drilled hole and the thickness of the covering layer is removed.
Claims (10)
1. A construction process for controlling the slope of an underwater reef explosion slope through presplitting blasting is characterized in that: the side slope control adopts presplitting blasting, the position of a presplitting hole (1) is 2.5m away from a toe line (3), the ultra-depth of a drilling hole is 1.6m, the distance between the drilling holes is 1.0m, the ultra-depth of the drilling hole is 1.5m within the range that a main blast hole (2) is 2m away from the toe line (3), the rest ultra-depth is 1.0m, and the distance between the drilling holes is 2.5 m; the main blast hole (2) is filled with colloid seismic explosive columns, the colloid seismic explosive columns are filled according to 60-70% of the length of the formed hole, the pre-cracked holes (1) are filled with emulsified phi 32 small explosive, the small explosive is fully distributed on a steel bar in a single row, and the explosive is fed to the bottom of the hole; the pre-cracked hole (1) is detonated before the main blast hole (2); the method specifically comprises the following steps:
the first step is as follows: construction of main gun hole
secondly, filling colloid seismic charge in the main blast hole (2), charging according to 60-70% of the length of the formed hole, and feeding charge to the bottom of the hole as required, and ensuring enough number of initiating bodies;
thirdly, connecting the main blast holes (2) immediately after charging is finished, and detonating the connecting line by adopting hole-by-hole micro-difference to reduce the damage to the slope rock mass;
the second step is that: pre-split hole construction
secondly, filling emulsified phi 32 small explosive cartridges (4-1) into the pre-splitting holes (1), connecting the cartridges in series by using detonating cords (4-2), binding the cartridges on reinforcing steel bars, and detonating by using double-detonator (4-3);
thirdly, connecting the pre-splitting holes (1) immediately after the charging is finished, and performing explosive simultaneous explosion on the connecting lines to improve the seam forming effect of the pre-splitting holes;
the third step: wire connecting operation
The pre-split hole (1) and the main blast hole (2) are detonated in sections by using a connecting pipe, so that the pre-split hole (1) is detonated before the main blast hole (2);
the fourth step: wiring protection
After the connection is finished, the construction ship slowly winches a certain distance, and after the connection is confirmed to be not scraped at the bottom of the ship, warning and removing the ship;
the fifth step: initiation of detonation
And after the ship is removed, sounding an explosion signal and detonating.
2. The construction process for controlling the slope of the underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the process control is used in the case of the slope with the required gradient steeper than 1: 0.75.
3. The construction process for controlling the slope of the underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the construction is carried out by firstly carrying out middle cut hole and then carrying out construction on two sides.
4. The construction process for controlling the slope of the underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: each tube of the seismic charge contains 5kg of explosive, the diameter of the charge is 100mm, and the length of the charge is 53 cm.
5. The construction process for controlling the slope of the underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the hole forming length is the depth of the drilled hole and the thickness of the covering layer is removed.
6. The construction process for controlling the slope of the underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the pre-splitting hole (1) is detonated before the main blast hole (2), and specifically comprises the following steps: reserving 2 rows of main blast holes (2) closest to the pre-splitting hole (1), and constructing according to the sequence that the pre-splitting hole (1) firstly makes a sound of the main blast holes (2) and then makes a sound.
7. A pre-splitting blasting construction structure for controlling the slope gradient of an underwater reef explosion slope, which is adopted by the process according to claim 1, and is characterized in that: the explosive-free drilling tool comprises pre-split holes (1), main blast holes (2) and explosives filled in the holes, wherein the positions of the pre-split holes (1) are 2.5m away from a toe line (3), the ultra-depth of drilling holes is 1.6m, the distance between the drilling holes is 1.0m, the ultra-depth of the drilling holes is 1.5m within the range that the main blast holes (2) are 2m away from the toe line (3), the rest ultra-depth is 1.0m, and the distance between the drilling holes is 2.5 m; the main blast hole (2) is filled with colloid seismic source explosive columns, the colloid seismic source explosive columns are filled according to 60-70% of the length of a formed hole, the pre-cracked hole (1) is filled with emulsified phi 32 small explosive, the small explosive is fully distributed on a steel bar in a single row, and the explosive is fed to the bottom of the hole; the pre-cracking hole (1) is detonated before the main blast hole (2).
8. The construction structure for controlling the slope of an underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the pre-splitting hole (1) is filled with small explosive cartridges (4-1), serially connected by using detonating cords (4-2), bound on a reinforcing steel bar and detonated by using double-shot detonators (4-3); each tube of the seismic charge contains 5kg of explosive, the diameter of the charge is 100mm, and the length of the charge is 53 cm.
9. The construction structure for controlling the slope of an underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the slope is controlled using this structure with a required slope steeper than 1: 0.75.
10. The construction structure for controlling the slope of an underwater reef explosion slope through presplitting blasting according to claim 1, which is characterized in that: the hole forming length is the depth of the drilled hole and the thickness of the covering layer is removed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011575814.XA CN112683118A (en) | 2020-12-28 | 2020-12-28 | Construction structure and process for controlling slope gradient of underwater reef explosion slope through presplitting blasting |
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| CN202011575814.XA CN112683118A (en) | 2020-12-28 | 2020-12-28 | Construction structure and process for controlling slope gradient of underwater reef explosion slope through presplitting blasting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877769A (en) * | 2022-03-24 | 2022-08-09 | 广西桂物爆破工程有限公司 | Offshore bank underwater slope bedrock blasting excavation construction method and blasting charge structure |
| CN116123952A (en) * | 2023-03-03 | 2023-05-16 | 中铁四局集团第二工程有限公司 | Underwater blasting construction method for embedded open caisson deep water foundation |
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2020
- 2020-12-28 CN CN202011575814.XA patent/CN112683118A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114877769A (en) * | 2022-03-24 | 2022-08-09 | 广西桂物爆破工程有限公司 | Offshore bank underwater slope bedrock blasting excavation construction method and blasting charge structure |
| CN116123952A (en) * | 2023-03-03 | 2023-05-16 | 中铁四局集团第二工程有限公司 | Underwater blasting construction method for embedded open caisson deep water foundation |
| CN116123952B (en) * | 2023-03-03 | 2023-07-18 | 中铁四局集团第二工程有限公司 | Underwater blasting construction method for embedded open caisson deep water foundation |
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