CN215572501U - A demolition unit for nuclear power foundation ditch gathers can cutting - Google Patents
A demolition unit for nuclear power foundation ditch gathers can cutting Download PDFInfo
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- CN215572501U CN215572501U CN202121279924.1U CN202121279924U CN215572501U CN 215572501 U CN215572501 U CN 215572501U CN 202121279924 U CN202121279924 U CN 202121279924U CN 215572501 U CN215572501 U CN 215572501U
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Abstract
The invention discloses a blasting device for nuclear power foundation pit energy-gathering cutting, which comprises an annular cutting device arranged in a main charge blast hole and a boundary control cutter horizontally arranged between two main charges, wherein an annular blasting hole is formed in a strip blasting area, the annular cutting device is arranged in the main charge blast hole, the boundary control cutter is arranged in a datum plane horizontal hole, and the datum plane horizontal hole is arranged between the two blast holes. The blasting device for the energy-gathered cutting of the nuclear power foundation pit is characterized in that a boundary control cutter is arranged at the horizontal position of a foundation surface and is positioned between two blast holes, the boundary control cutter performs horizontal cutting along the foundation surface, the depth of a cut crack is larger than 20cm, an annular cutter further performs cutting on the foundation surface, finally main explosive is detonated, rocks in a region to be blasted are cut off and pushed away along the foundation surface through the explosive thrust of the main explosive, the rock mass blasting is completed, the flatness of the foundation surface after blasting is high, and the requirement of the nuclear power foundation pit is met.
Description
Technical Field
The invention relates to a blasting device for nuclear power foundation pit energy-gathering cutting, and belongs to the field of blasting.
Background
The excavation of the negative excavation foundation pit of the nuclear power plant is mostly constructed by adopting an explosion method, and the application of the explosion technology in the excavation quality control of the foundation surface is more and more emphasized. The national technical standard used in nuclear power construction at present requires high quality of the foundation surface formed by excavation. And (5) reserving a certain thickness of bedrock when the base plate is excavated to the adjacent bottom plate, and carrying out layered blasting. The method has high cost, the engineering quality is difficult to meet the technical standard requirement, and the excessive overexcavation part generated by blasting needs to be replaced by concrete, thereby causing a great amount of economic loss.
The formation of the negative excavation control boundary of the foundation pit becomes one of key control items of a nuclear power construction process, and nuclear power facilities provide challenges for implementation of explosion technologies under severe requirements on safety and quality. The rock at the bottom of the step mainly overcomes the chassis resistance line by the shearing action generated by the expansion of explosive gas, the clamping action of the rock at the bottom is strong, and the bottom is easy to generate when the explosion energy is insufficient. The center position of the columnar charge is reduced by adopting an ultra-deep drilling method to eliminate the root, so that the bottom plate is easy to be dug excessively. The non-coupling cylindrical charging structure adopted by the nuclear facility foundation pit blasting is characterized in that the blasting product and the explosion stress wave generate tensile damage along the peripheral hole wall and the hole bottom bedrock, and random radial and annular cracks are inevitably generated on the rock wall surface, so that the foundation surface is damaged or even destroyed.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides the blasting device for nuclear power foundation pit energy-gathering cutting.
The technical scheme is as follows: in order to solve the technical problem, the blasting device for nuclear power foundation pit energy-gathering cutting comprises a plurality of main explosive devices distributed in an annular mode and a boundary control cutter arranged between the two main explosive devices, wherein an annular blasting hole is formed in a blasting area, the main explosive devices are located in blast holes, the boundary control cutter is located in a datum plane horizontal hole, and the datum plane horizontal hole is located between the two blast holes.
Preferably, the main explosive device comprises explosive, a PVC pipe and a ring cutter, wherein the ring cutter, the first stemming, the explosive and the second stemming are sequentially filled in the PVC, and the explosive is ignited after the ring cutter works.
Preferably, the boundary control cutter comprises a shell, cylindrical shells are arranged at two ends of the shell, a conical shaped charge cover is arranged in each cylindrical shell, cylindrical charges are arranged below the conical shaped charge cover, strip charges are arranged in the shell, and a wedge-shaped charge cover is arranged above the strip charges.
Preferably, the casing is provided with a frying pan.
The blasting method of the blasting device for the nuclear power foundation pit energy-gathering cutting comprises the following steps:
(1) blasting the periphery of the to-be-blasted area of the nuclear island to an elevation, and opening up an empty surface for blasting the nuclear island;
(2) cutting and blasting the reserved rock stratum of the nuclear island from the periphery to the center in different areas, wherein the blasting resistance line is 2m each time;
(3) carrying out main shot hole distribution and perforation along the resisting line with the interval of 2.0m to 3m of 2m line, wherein the perforation depth is consistent with the reserved rock stratum of the nuclear island;
(4) horizontally perforating from the outer side to the inner side along the nuclear island foundation plane, wherein the hole distribution position is the central position of the two main blast holes;
(5) the lowest end of the main blast hole is provided with an annular cutter, and the upper part of the main blast hole is provided with main charge;
(6) setting a control cutter in a horizontal hole of a base surface under construction;
(7) the boundary cutter is firstly detonated during blasting, then the annular cutter and finally the main charge are taken as the annular cutter;
(8) and (5) repeating the steps (2) to (7) until the blasting is finished.
In the invention, the configuration of the boundary control cutter is complex, the characteristics of EFP and energy-gathered jet flow are considered, the splitting action in the rock of the EFP projectile is fully utilized, the enhancement action of the linear energy-gathered jet flow on a fracture stress wave is considered, and the requirements of large explosion height of the EFP projectile action and small explosion height of the linear energy-gathered jet flow are considered.
Has the advantages that: according to the blasting device for the energy-gathered cutting of the nuclear power foundation pit, the boundary control cutter is arranged at the horizontal position of the foundation surface to be built and is positioned between the two blast holes, the boundary control cutter is used for horizontally cutting the field to be blasted, the cutting depth is within 20cm, the annular cutter is used for further cutting the field to be blasted, finally the main explosive is detonated, the area to be blasted is cut off and moved away through the blasting thrust of the main explosive, the area blasting is completed, the flatness of the foundation surface to be built after the blasting is high, and the requirement of the nuclear power foundation pit is met.
Drawings
Fig. 1 is a schematic top-view blasting of the present invention.
Fig. 2 is a front blasting schematic view of the present invention.
FIG. 3 is a schematic diagram of the control cutter of the present invention.
FIG. 4 is a schematic structural diagram of a control boundary cutter according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 4, the blasting device for nuclear power foundation pit energy-gathering cutting of the invention comprises a plurality of main explosive devices distributed in an annular manner and a boundary control cutter arranged between the two main explosive devices, wherein an annular blast hole is arranged in a blasting area, the main explosive devices are arranged in blast holes 8, the boundary control cutter is arranged in a base-building plane horizontal hole 9, and the base-building plane horizontal hole 9 is arranged between the two blast holes 8.
In the invention, the main explosive device comprises an explosive 12, a PVC pipe and a ring cutter 11, wherein the ring cutter 11, a first stemming 13, the explosive 12 and a second stemming 14 are sequentially filled in the PVC, and the explosive 12 is ignited after the ring cutter 11 finishes working.
The boundary control cutter comprises a shell 1, cylindrical shells are arranged at two ends of the shell 1, a conical shaped charge cover 4 is arranged in each cylindrical shell, a cylindrical charge 2 is arranged below each conical shaped charge cover 4, a detonator inserting part 7 is arranged below each cylindrical charge 2, a strip-shaped charge 3 is arranged in the shell 1, a wedge-shaped charge cover 5 is arranged above each strip-shaped charge 3, and a blast piece 6 is arranged on the shell 1.
The blasting method of the blasting device for the nuclear power foundation pit energy-gathering cutting comprises the following steps:
(1) blasting the periphery of the to-be-blasted area of the nuclear island to an elevation, and opening up an empty surface for blasting the nuclear island;
(2) cutting and blasting the reserved rock stratum of the nuclear island from the periphery to the center in different areas, wherein the blasting resistance line is 2m each time;
(3) carrying out 8 hole distribution and perforation of main blast holes at intervals of 2.0m to 3m along the resisting line as 2m lines, wherein the perforation depth is consistent with that of reserved rock stratums of the nuclear island;
(4) horizontally perforating from the outer side to the inner side along the nuclear island foundation plane, wherein the hole distribution position is the central position of the two main blast holes 8;
(5) the lowest end of the main blast hole 8 is provided with an annular cutter 11, and the upper part is provided with main charge;
(6) setting a control cutter in the horizontal hole 9 of the basal plane under construction;
(7) the boundary cutter is firstly detonated during blasting, then the annular cutter 11 is used, and finally the main charge is used;
(8) and (5) repeating the steps (2) to (7) until the blasting is finished.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. The utility model provides a demolition unit that is used for nuclear power foundation ditch to gather can cutting which characterized in that: the annular cutting device that includes a plurality of annular distribution and be located the accuse boundary cutterbar that sets up between two main charges, be provided with annular blast hole in the blasting region, annular cutting device is located main big gun hole, and the horizontal big gun hole of drilling on the base plane is built to two main big gun holes within a definite time, and accuse boundary cutterbar level sets up in the big gun hole.
2. The blasting device for nuclear power foundation pit energy-gathering cutting as claimed in claim 1, wherein: the main explosive charging device comprises an explosive, a PVC pipe and an annular cutter, wherein the annular cutter, a first stemming, the explosive and a second stemming are sequentially filled in the PVC, and the annular cutter detonates the main explosive after working.
3. The blasting device for nuclear power foundation pit energy-gathering cutting as claimed in claim 1, wherein: the boundary control cutter comprises a shell, cylindrical shells are arranged at two ends of the shell, a conical shaped charge cover is arranged in each cylindrical shell, cylindrical charges are arranged below the conical shaped charge cover, bar charges are arranged in the shell, and a wedge-shaped charge cover is arranged above the bar charges.
4. The blasting device for nuclear power foundation pit energy-gathered cutting according to claim 3, characterized in that: the shell is provided with a blast piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121279924.1U CN215572501U (en) | 2021-06-09 | 2021-06-09 | A demolition unit for nuclear power foundation ditch gathers can cutting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121279924.1U CN215572501U (en) | 2021-06-09 | 2021-06-09 | A demolition unit for nuclear power foundation ditch gathers can cutting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215572501U true CN215572501U (en) | 2022-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121279924.1U Active CN215572501U (en) | 2021-06-09 | 2021-06-09 | A demolition unit for nuclear power foundation ditch gathers can cutting |
Country Status (1)
| Country | Link |
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| CN (1) | CN215572501U (en) |
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2021
- 2021-06-09 CN CN202121279924.1U patent/CN215572501U/en active Active
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