1. A boundary control cutter is characterized in that: contain the wire-electrode cutting body and be located the cylindrical shaped charge body of wire-electrode cutting body both sides, the wire-electrode cutting body contains the shell, and the both ends of shell are equipped with cylindrical shell, are equipped with toper type of charge cover in cylindrical shell, and toper type of charge cover below is equipped with the cylindricality powder charge, is equipped with the bar powder charge in the shell, and bar powder charge top is equipped with wedge type of charge cover.

2. The boundary cutter as claimed in claim 1, wherein: the shell is provided with a blast piece.

3. The boundary cutter as claimed in claim 1, wherein: and 3D printing and manufacturing the whole boundary control cutter.

4. The boundary cutter as claimed in claim 1, wherein: the cylindrical shell is welded on the shell, the wedge-shaped liner is welded on the shell, and the conical liner is welded on the cylindrical shell.

5. The blasting device for nuclear power foundation pit energy-gathering cutting as claimed in claim 1, wherein: the blasting explosive comprises a plurality of main explosive devices distributed in an annular mode and a boundary control cutter according to claim 1, wherein the boundary control cutter is arranged between the two main explosive devices, annular blasting holes are formed in an area to be blasted, the main explosive devices are located in blast holes, the boundary control cutter is located in a base plane horizontal hole, and the base plane horizontal hole is located between the two blast holes.

6. The blasting device for nuclear power foundation pit energy-gathering cutting as claimed in claim 1, wherein: the main explosive loading 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 loaded in the PVC, and the explosive is ignited after the annular cutter finishes working.

7. The blasting method using the blasting device for the energy-gathered cutting of the nuclear power foundation pit as claimed in claim 5 or 6, is characterized by comprising the following steps of:

(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.

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 a boundary control cutter, and an explosion device and method for nuclear power foundation pit energy-gathering cutting. The requirement of large explosion height of rod type jet flow action and small explosion height of linear energy-gathering jet flow are considered.

The technical scheme is as follows: in order to solve the technical problem, the boundary control cutter comprises a linear cutting body and cylindrical charge bodies positioned on two sides of the linear cutting body, wherein the linear cutting body comprises a shell, cylindrical shells are arranged at two ends of the shell, a conical charge liner is arranged in each cylindrical shell, cylindrical charge is arranged below each conical charge liner, a strip charge is arranged in each shell, and a wedge-shaped charge liner is arranged above each strip charge.

Preferably, the casing is provided with a frying pan.

Preferably, the control cutter is manufactured by 3D printing on the whole.

Preferably, the cylindrical shell is welded to the outer shell, the wedge liner is welded to the outer shell, and the cone liner is welded to the cylindrical shell.

A 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 according to claim 1, wherein the boundary control cutter is arranged between the two main explosive devices, an annular blasting hole is formed in an area to be blasted, 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.

The blasting method using 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 boundary control cutter fuses two structures of energy-gathered jet flow and rod-type jet flow, absorbs the fact that the rod-type jet flow has deep perforation in rocks, and after the rod-type jet flow is combined on the same plane, the expansion of cracks is facilitated to play a crack leading role, and the linear energy-gathered jet flow plays an auxiliary role in crack expansion, so that the two structures play a role of the two jet flows and have different explosion heights. According to the invention, the shell and the shaped charge liner are welded, so that reliable initiation and cutting effects of linear charge are considered by utilizing the sympathetic explosion principle of charge on the premise of ensuring the efficiency performance of rod-type jet.

Has the advantages that: the boundary control cutter of the invention gives consideration to the characteristics of rod-type jet flow and energy-gathered jet flow, fully utilizes the splitting action in rock of the rod-type jet flow, and also gives consideration to the reinforcing action of linear energy-gathered jet flow on fracture stress waves. The requirement of large explosion height of rod-type jet flow action and small explosion height of linear energy-gathered jet flow are considered; 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 view of the cutter of the present invention;

fig. 2 is a cross-sectional view.

Fig. 3 is a schematic top-view blasting of the present invention.

Fig. 4 is a front blasting schematic view of the present invention.

FIG. 5 is a schematic diagram of the control cutter of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

As shown in fig. 1 and 2, the boundary control cutter comprises a shell 1, wherein 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 insertion 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 high-explosive piece 6 is arranged on the shell 1. The boundary control cutter of the invention gives consideration to the characteristics of rod-type jet flow and energy-gathered jet flow, fully utilizes the splitting action in rock of the rod-type jet flow, and also gives consideration to the reinforcing action of linear energy-gathered jet flow on fracture stress waves. The requirement of large explosion height of rod type jet flow action and small explosion height of linear energy-gathering jet flow are considered.

The boundary control cutter integrates two structures of energy-gathered jet flow and rod-type jet flow, absorbs the fact that the rod-type jet flow has the depth of a through hole in a rock, combines a plurality of rod-type jet flows on the same plane to be beneficial to crack expansion and play a role of crack guide, and the linear energy-gathered jet flow plays an auxiliary role of crack expansion, so that the two structures play roles of the two jet flows and have different explosion heights. According to the invention, the shell and the shaped charge liner are welded, so that reliable initiation and cutting effects of linear charge are considered by utilizing the sympathetic explosion principle of charge on the premise of ensuring the efficiency performance of rod-type jet.

As shown in fig. 3 to 5, the blasting device for nuclear power foundation pit energy-gathering cutting of the present invention includes a plurality of main explosive devices distributed in an annular shape and a boundary control cutter disposed between the two main explosive devices, wherein an annular blast hole is disposed in a region to be blasted, the main explosive devices are disposed in blast holes 8, the boundary control cutter is disposed in a base-building plane horizontal hole 9, and the base-building plane horizontal hole 9 is disposed 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 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.