CN111795625B - Method and device for protecting shock waves in water of blasting excavation of seabed foundation pit - Google Patents
Method and device for protecting shock waves in water of blasting excavation of seabed foundation pit Download PDFInfo
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- CN111795625B CN111795625B CN202010731756.9A CN202010731756A CN111795625B CN 111795625 B CN111795625 B CN 111795625B CN 202010731756 A CN202010731756 A CN 202010731756A CN 111795625 B CN111795625 B CN 111795625B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
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Abstract
The invention discloses a method and a device for protecting shock waves in water of blasting excavation of a seabed foundation pit, which comprises the following steps: (1) determining the position of a protective device according to the size of the foundation pit; (2) manufacturing a flexible protection wall, wherein the flexible protection wall comprises a protection panel, a protection reinforcing mesh, a spring and a connecting piece, and the protection panel comprises an open-cell polyurethane foam panel, a chloroprene rubber interlayer and an air interlayer; (3) the installation protection device comprises a flexible protection wall, bottom section steel, a steel pipe with holes and a high-pressure air pipe, wherein the lower part of the flexible protection wall is connected with the bottom section steel, the outer side of the bottom section steel is connected with the steel pipe with holes, the steel pipe with holes is communicated with the high-pressure air pipe, and the flexible protection wall is bound into a whole by a rope; (4) and inflating to form a bubble curtain. The invention combines the flexible protective wall and the bubble curtain, can effectively reduce the shock wave in water in a near blasting area, and protects constructors, marine organisms, surrounding aquatic environment and underwater buildings; meanwhile, the shock wave is absorbed by the protection panel, so that the shock wave reflection is reduced, and the foundation pit is protected.
Description
Technical Field
The invention relates to the technical field of engineering blasting, in particular to a method and a device for protecting shock waves in water of blasting excavation of a submarine foundation pit.
Background
In recent years, the seabed foundation pit blasting excavation technology is widely applied to offshore wind power, bridges and other construction projects. The underwater shock waves generated in the blasting construction process inevitably cause damage to constructors, marine organisms, surrounding aquatic environments and underwater structures.
In the protection of shock waves in water, the currently adopted methods are: bubble curtain technology and setting blast wall. The bubble curtain technology is characterized in that high-pressure gas is introduced between a blasting area and a protected object to form a continuously rising and dense bubble curtain, and wave impedance mutation between media is utilized to block propagation of shock waves in water; but the eliminating and protecting effects on the short-distance underwater blasting shock waves are not obvious. The blast wall resists blast load by relying on the structural strength, ductility and energy absorption concepts; but the volume is huge, the construction cost is high, the construction is complex, and the large-scale popularization is difficult.
The bubble curtain device disclosed in Chinese patent CN 201826334U comprises an air compressor and a transmitting tube arranged on a suspension device, and the peak clipping rate is between 42.9% and 97.3%. However, the single bubble curtain device has limited clipping effect because bubbles rise and are diffused continuously, and if a certain effect is to be achieved, a plurality of high-power air compressors are required to act simultaneously, so that the energy consumption is high. The underwater shock wave protection device disclosed in the Chinese patent CN 107883824A comprises laminated bamboo raft interlayers bound by bamboo tubes with the water content of more than 40% and balance weights, wherein natural closed air bags in the bamboo tubes are used for forming air interlayers, and the propagation of shock waves is hindered by medium wave impedance mutation. However, the device is large in size, large in construction difficulty and not suitable for large-scale use, and the bamboo tube can be broken in the protection process, so that secondary damage is caused.
The scheme is generally set for a specific static protection object, but the safety of marine organisms, constructors and the like is threatened; and the shock wave is reflected after encountering a bubble curtain or a common protective wall, so that the excavated foundation pit is easily influenced.
Therefore, the underwater shock wave protection method is arranged in a near blasting area and can obviously reduce the influence of underwater shock waves.
Disclosure of Invention
The invention aims to provide a protection method for underwater shock waves in blasting excavation of a submarine foundation pit, which utilizes the combination of protection partition and bubble curtain technology for double protection, and carries out wave absorption in a near blasting area so as to reduce the harm of the underwater shock waves to the surrounding water environment and constructors; meanwhile, shock waves are effectively absorbed, reflection is reduced, and stability of the foundation pit is protected.
The method for protecting the shock wave in the water of blasting excavation of the seabed foundation pit, which is provided by the invention, comprises the following steps:
(1) and determining the arrangement position of the protective device according to the plane size of the foundation pit. The protective device is arranged at a position, the diameter of the covering layer on the plane is 2-10m larger than that of the foundation pit, and the vertical surface is the area from the top of the covering layer to the water surface.
(2) And manufacturing a flexible protection wall, which comprises a protection panel, a protection reinforcing mesh, a spring and a connecting piece. The protective panel comprises a layer of open-cell polyurethane foam panel, two layers of chloroprene rubber interlayers and an air interlayer, and all the layers are tightly connected. Both sides of the protection panel are connected with a protection reinforcing mesh through springs, the protection reinforcing mesh has a supporting effect, and the protection panel vibrates to drive the springs to compress so as to absorb part of energy; and the upper side and the lower side of the protective reinforcing mesh are connected with reinforcing steel bar connecting pieces which are respectively used for interconnecting the bottom section steel with the flexible protective walls and the flexible protective walls.
The open-cell polyurethane foam panel is positioned on the wave-facing side, is in a wave shape, has the thickness of 10-20mm, the wave amplitude of 5-10mm and the wave amplitude ratio of 2-5, and can absorb shock waves and consume part of energy. The air interlayer is clamped between the two layers of chloroprene rubber interlayers and is tightly connected with the open-pore polyurethane foam panel, the surface of the wave-facing side of the air interlayer is conical and 10-20mm in thickness, rubber is used for waterproof treatment at the edge of the open-pore polyurethane foam panel, the thickness of the front chloroprene rubber interlayer positioned on the side, close to the foundation pit, of the air interlayer is 20-30mm, and the thickness of the rear chloroprene rubber interlayer positioned on the outermost side is 10-15 mm. The neoprene barrier is the primary material that dissipates shock wave energy. The protective panel can effectively absorb shock waves, consume energy and prevent the shock waves from being transmitted to the outer side.
Each flexible protective wall is 5-12m in length and 5-30m in height relative to water depth.
(3) And installing a protection device, wherein the protection device comprises a flexible protection wall, bottom section steel, a steel pipe with holes and a high-pressure air pipe. The bottom section steel is positioned at the bottom of the flexible protective wall, is used as a balance weight and has a positioning function, and is connected with the flexible protective wall through a connecting piece, and the length of the bottom section steel is 5-12 m. The steel pipes with holes are connected to the outer side of the bottom section steel, and are consistent in length and number with the bottom section steel; one end of the steel pipe with the hole is plugged, the other end of the steel pipe with the hole is communicated with a high-pressure air pipe, and the high-pressure air pipe is communicated with an air compressor to form a bubble curtain device.
Binding the flexible protection wall at intervals by using connecting ropes to form a whole, wherein the connecting ropes are common ropes, and binding the whole protection device once every 3-6m from bottom to top, and binding for 2-3 circles every time, so that the fixing and supporting effects are achieved; the adjacent reinforcing steel bar nets can also be connected by steel wires to form a whole.
The whole structure of the protection device consists of 6-10 flexible protection walls, bottom section steel and steel pipes with holes, wherein the bottom section steel and the steel pipes are the same in number.
(4) And inflating to form a bubble curtain. And inflating the steel pipe with the hole by using a high-pressure air pipe to form a stable and ascending dense bubble curtain.
The invention also provides a protective device for the shock wave in the water of blasting excavation of a seabed foundation pit, which comprises a flexible protective wall, bottom section steel and a bubble curtain device, wherein the bubble curtain device comprises an air compressor, a steel pipe with holes and a high-pressure air pipe, the flexible protective wall comprises a protective panel, a protective steel bar net, a spring and a connecting piece, the protective panel comprises a layer of perforated polyurethane foam panel, two layers of chloroprene rubber interlayers and an air interlayer, two sides of the protective panel are connected with the protective steel bar net through the spring, the whole flexible protective wall sequentially comprises the protective steel bar net, the spring, the chloroprene rubber interlayer, the air interlayer, the chloroprene rubber interlayer, the perforated polyurethane foam panel, the spring and the protective steel bar net from outside to inside, the layers are tightly connected, the spring is connected at each junction of the protective steel bar net, the upper side and the lower side of the protective steel bar net are connected with steel bar connecting pieces, the bottom section steel and the flexible protection walls are connected with each other respectively, the perforated steel pipes are connected to the outer side of the bottom section steel and are consistent in length and same in quantity with the bottom section steel, one end of each perforated steel pipe is plugged, the other end of each perforated steel pipe is communicated with the high-pressure air pipe, the high-pressure air pipe is communicated with the air compressor, the flexible protection walls are arranged around the circle of the foundation pit, the blocks are connected with each other through connecting ropes, and the flexible protection walls can be detached and reused after being used.
According to the underwater shock wave protection device for blasting excavation of the seabed foundation pit, the open-pore polyurethane foam panel is located on the wave-facing side and is in a wave shape.
According to the underwater shock wave protection device for blasting excavation of the seabed foundation pit, the air interlayer is clamped between the two layers of chloroprene rubber interlayers and is tightly connected with the open-pore polyurethane foam panel, the wave-facing side surface of the air interlayer is conical, and rubber is used for waterproof treatment at the edge of the open-pore polyurethane foam panel.
The device for protecting the shock wave in the water generated by blasting and excavating the seabed foundation pit has the thickness of 10-20mm, the wave amplitude of 5-10mm and the wave length-amplitude ratio of 2-5.
According to the underwater shock wave protection device for blasting excavation of the seabed foundation pit, the thickness of the air interlayer is 10-20mm, the thickness of the front chloroprene rubber interlayer positioned on the side, close to the foundation pit, of the air interlayer is 20-30mm, and the thickness of the rear chloroprene rubber interlayer positioned on the outermost side of the air interlayer is 10-15 mm.
According to the underwater shock wave protection device for blasting excavation of the seabed foundation pit, the length of each flexible protection wall is 5-12m, the height of each flexible protection wall is 5-30m relative to the water depth, the whole structure of the protection device is composed of 6-10 flexible protection walls, the same number of bottom section steels and the same number of steel pipes with holes, and the steel pipes with holes are communicated with an air compressor through high-pressure air pipes.
Foretell a seabed foundation ditch blasting excavation aquatic shock wave protector utilizes connecting rope interval ligature to form wholly between the flexible protective wall. The connecting rope is a common rope, the whole protective device is bound once every 3-6m from bottom to top, and the binding is carried out for 2-3 circles each time, so that the fixing and supporting effects are achieved; the adjacent reinforcing steel bar nets can also be connected by steel wires to form a whole.
The underwater shock wave protection device for blasting excavation of the seabed foundation pit is used for protecting marine organisms and constructors moving in water and protecting the foundation pit.
The method for protecting the shock wave in the water of blasting excavation of the seabed foundation pit has the beneficial effects that:
(1) the invention provides a double protection method combining a bubble curtain and a protection partition, which can effectively absorb shock waves in a near blasting area and consume energy of the shock waves, the reduction efficiency of the shock waves can reach more than 80 percent, and the damage of the shock waves in water to surrounding aquatic organisms, constructors and underwater buildings is reduced; meanwhile, the wave absorbing effect of the flexible protective wall structure is utilized to reduce the reflection of shock waves and better protect the excavated foundation pit from being damaged by the reflection of the shock waves.
(2) The polyurethane foam material on the surface layer of the protective panel has similar wave impedance with an aqueous medium, so that shock waves can be well absorbed, the hole opening material can enhance the reflection and refraction of the shock waves in holes and enhance the loss of the shock waves, the surface is designed into a wave shape, so that the absorption area is enlarged, and meanwhile, tiny particles can be added into the polyurethane foam to enhance the scattering of incident waves so as to consume the energy of the shock waves; the air interlayer can prevent shock waves from spreading outwards, can generate large deformation to consume energy of the shock waves through resonance, is provided with a conical surface, can enhance reflection and refraction of the shock waves to increase energy dissipation, and can be absorbed again in the chloroprene rubber interlayer and the polyurethane foam layer. The chloroprene rubber is used as a main wave absorbing material, is a high polymer material with viscoelasticity like a polyurethane foam material, resists water pressure, resists corrosion, has high elasticity and certain tensile strength, has higher internal loss of the chloroprene rubber layer, is quickly attenuated due to the damping action after shock waves are incident, is converted into heat energy to be dissipated, and has a closed cell structure, so that the reflection, refraction and scattering of the shock waves propagating in the chloroprene rubber layer can be enhanced, and the shock waves in water can be effectively weakened.
(3) The protection panel is fixed between the two reinforcing meshes through the spring, and when the flexible protection panel deforms under the action of shock waves, the spring can be driven to compress and deform, partial energy is consumed, and the shock waves are effectively reduced.
(4) The protection device used by the method mainly comprises the following steps: the device comprises a protective panel, a reinforcing mesh, springs, connecting pieces, bottom section steel, an air compressor, a steel pipe with holes, a high-pressure air pipe and the like, and is flexible and convenient to construct and install, part of the device can be reused, and the cost is low; the protective panel can be rolled up, saves space, is convenient to transport and store, and is suitable for being popularized on a large scale.
Drawings
Fig. 1 is a schematic cross-sectional view of an underwater shock wave protection device for blasting excavation of a seabed foundation pit.
Fig. 2 is a schematic view of a top view structure of the underwater shock wave protection device for blasting excavation of a seabed foundation pit.
Fig. 3 is a schematic structural view of the flexible protective wall.
Fig. 4 is an exploded view of the flexible protective wall.
In the figure, 1 — flexible guard wall; 2-bottom section steel; 3, steel pipes with holes; 4-high pressure gas pipe; 5-a protective panel; 6-reinforcing mesh; 7-a spring; 8, connecting pieces; 9-polyurethane foam panels; 10-neoprene barrier layer; 11-air barrier.
Detailed Description
The method of the present invention will be further specifically described below by way of examples with reference to the accompanying drawings.
Example 1
A protection device for underwater shock wave during blasting excavation of a seabed foundation pit comprises a flexible protection wall 1, bottom section steel 2 and a bubble curtain device, wherein the bubble curtain device comprises an air compressor, a perforated steel pipe 3 and a high-pressure air pipe 4, the flexible protection wall 1 comprises a protection panel 5, a protection reinforcing mesh 6, a spring 7 and a connecting piece 8, the protection panel 5 comprises a one-layer perforated polyurethane foam panel 9, two layers of chloroprene rubber interlayers 10 and one layer of air interlayer 11, two sides of the protection panel 5 are connected with the protection reinforcing mesh 6 through the spring 7, the whole flexible protection wall 1 sequentially comprises the protection reinforcing mesh 6, the spring 7, the chloroprene rubber interlayer 10, the air interlayer 11, the chloroprene interlayer rubber 10, the perforated polyurethane foam panel 9, the spring 7 and the protection reinforcing mesh 6 from outside to inside, the layers are tightly connected, and each node of the protection reinforcing mesh 6 is connected with the spring 7, protection reinforcing bar net 6 is upper and lower both sides all be connected with steel bar connection 8, is used for the interconnect between bottom shaped steel 2 and the flexible protective wall 1 and between each flexible protective wall 1 respectively, foraminiferous steel pipe 3 is connected in the bottom shaped steel 2 outside, and with bottom shaped steel 2 length is unanimous, and quantity is the same, 3 one end shutoff of foraminiferous steel pipe, other end intercommunication high-pressurepipe 4, high-pressurepipe and air compressor machine intercommunication, flexible protective wall 1 is around the foundation ditch round, can dismantle the connection together.
Further, according to the above device for protecting the shock wave in the water for blasting and excavating the seabed foundation pit, the open-pore polyurethane foam panel 9 is located on the wave-facing side, i.e., faces the shock wave and is in a wave shape.
Further, according to the device for protecting the underwater shock wave in the blasting excavation of the seabed foundation pit, the air interlayer 11 is clamped between the two layers of the chloroprene rubber interlayers 10 and is tightly connected with the open-pore polyurethane foam panel 9, the surface of the wave-facing side of the air interlayer 11 is conical, and rubber is used for waterproof treatment at the edge of the open-pore polyurethane foam panel 9.
Further, according to the device for protecting the shock wave in the water generated by blasting and excavating the seabed foundation pit, the thickness of the open-pore polyurethane foam panel 9 is 10-20mm, the wave amplitude is 5-10mm, and the wave length-to-amplitude ratio is 2-5.
Further, according to the device for protecting the shock wave in the water of blasting excavation of the seabed foundation pit, the thickness of the air interlayer 11 is 10-20mm, the thickness of the front chloroprene rubber interlayer positioned on the side, close to the foundation pit, of the air interlayer is 20-30mm, and the thickness of the rear chloroprene rubber interlayer positioned on the outermost side is 10-15 mm.
Furthermore, each flexible protection wall 1 is 5-12m in length and 5-30m in height related to water depth, and the whole structure of the protection device consists of 6-10 flexible protection walls 1, bottom section steels 2 and steel pipes with holes 3, wherein the bottom section steels and the steel pipes are in the same number.
Furthermore, according to the underwater shock wave protection device for blasting excavation of the seabed foundation pit, the flexible protection walls 1 are bound at intervals by the connecting ropes to form a whole. The connecting ropes are ordinary ropes, and the adjacent flexible protection walls are bound once every 3-6m from bottom to top, and bound for 2-3 circles each time, so that the fixing and supporting effects are achieved; the adjacent reinforcing steel bar nets can also be connected by steel wires to form a whole.
Example 2
The offshore wind power pile foundation blasting excavation engineering is located in a near-coast area, the water depth is 30m, and the thickness of a covering layer is 10-30 m. According to engineering requirements, after the shaft guiding machine is excavated, a wind power pile foundation pit with the diameter of 8m is expanded and excavated under a covering layer by adopting an explosion method, and the foundation pit extends into a rock foundation by 15 m. As shown in fig. 1-4, the method for protecting the shock wave in the water of blasting excavation of the seabed foundation pit comprises the following specific steps:
(1) and determining the arrangement position of the protective device according to the plane size of the foundation pit. In the project, the diameter of a foundation pit is 8m, the diameter of the protection area on the plane is 2m larger than that of the foundation pit, and 10m is taken as shown in figure 2; in the vertical plane is the area from the top of the cover to the water surface, as shown in fig. 1.
(2) The flexible protective wall 1 is manufactured and comprises a protective panel 5, a protective reinforcing mesh 6, a spring 7 and a connector 8, as shown in figure 4. The protective panel 5 comprises a layer of open-cell polyurethane foam panel 9, two layers of neoprene interlayers 10 and an air interlayer 11, which are tightly connected with each other, as shown in fig. 3. Both sides of the protection panel 5 are connected with a protection reinforcing mesh 6 through springs 7, the protection reinforcing mesh 6 has a supporting function, and the protection panel 5 vibrates to drive the springs 7 to compress so as to absorb part of energy; both sides all are connected with steel bar connection 8 about protection reinforcing bar net 6, are used for the interconnect between bottom shaped steel 2 and flexible protective wall 1 and each flexible protective wall 1 respectively.
The open-cell polyurethane foam panel 9 is positioned on the wave-facing side, is in a wave shape, has the thickness of 15mm, the wave amplitude of 5mm and the wavelength-amplitude ratio of 4, and can absorb shock waves and consume part of energy. The air interlayer 11 is clamped between the two layers of chloroprene rubber interlayers 10 and is tightly connected with the open-pore polyurethane foam panel 9, the air interlayer 11 is conical and 15mm in thickness, rubber is used for waterproof treatment at the edge of the open-pore polyurethane foam panel 9, the front chloroprene rubber interlayer 9 on the side, close to the foundation pit, of the air interlayer 11 is 30mm thick, and the rear chloroprene rubber interlayer 9 on the outermost side is 10mm thick; the shock wave can be effectively absorbed, the energy is consumed, and the shock wave is prevented from being transmitted to the outer side. Each flexible protective wall 1 has a length of 10m and a height of 30 m.
(3) Installation protector, including flexible protective wall 1, bottom shaped steel 2, bubble curtain device includes air compressor machine, foraminiferous steel pipe 3 and high-pressurepipe 4. The bottom section steel 2 is positioned at the bottom of the flexible protection wall 1, plays a role in positioning as a balance weight, is connected with the flexible protection wall 1 through a connecting piece 8, and is 10m as long as the flexible protection wall. The steel pipes 3 with holes are connected to the outer side of the bottom section steel 2, and are consistent in length and number with the bottom section steel 2; one end of the steel pipe with the hole 3 is plugged, the other end of the steel pipe with the hole is connected with a high-pressure air pipe 4, and the high-pressure air pipe is communicated with an air compressor.
Binding the flexible protection walls 1 at intervals by using connecting ropes to form a whole, wherein the connecting ropes are common ropes, and binding the adjacent flexible protection walls once every 5m from bottom to top, wherein the binding is performed for 2-3 circles each time, so that the fixing and supporting effects are realized; the adjacent reinforcing steel bar nets can also be connected by steel wires to form a whole.
The whole structure of the protection device consists of 6 flexible protection walls 1, bottom section steel 2 and steel pipes 3 with holes, wherein the bottom section steel 2 and the steel pipes are the same in number.
(4) And inflating to form a bubble curtain. The high-pressure air pipe 4 inflates air to the steel pipe 3 with holes to form a dense bubble curtain which stably rises.
It should be noted that: the techniques not described in detail in the present invention all use the prior art.
The above embodiments are merely illustrative of the technical solutions of the present invention. The underwater antiknock protection device based on shock wave reflection energy dissipation of the present invention is not limited to the structure described in the above embodiments, but is subject to the scope defined by the claims. Any modification, or addition, or equivalent replacement by a person skilled in the art on the basis of this embodiment is within the scope of the invention as claimed.
Claims (5)
1. A method for protecting shock waves in water of blasting excavation of a seabed foundation pit is characterized by comprising the following steps: (1) determining the arrangement position of the protective device according to the plane size of the foundation pit; (2) manufacturing a flexible protection wall, wherein the flexible protection wall comprises a protection panel, a protection reinforcing mesh, a spring and a connecting piece, and the protection panel comprises an open-cell polyurethane foam panel, a chloroprene rubber interlayer and an air interlayer; the whole flexible protection wall sequentially comprises a protection reinforcing mesh, a spring, a rear chloroprene rubber interlayer, an air interlayer, a front chloroprene rubber interlayer, an open-cell polyurethane foam panel, a spring and a protection reinforcing mesh from outside to inside; the open-cell polyurethane foam panel is positioned on the wave-facing side and is in a wave shape; (3) the installation protection device comprises a flexible protection wall, bottom section steel, a steel pipe with holes and a high-pressure air pipe, wherein the lower part of the flexible protection wall is connected with the bottom section steel, the outer side of the bottom section steel is connected with the steel pipe with holes, the steel pipe with holes is communicated with the high-pressure air pipe, the high-pressure air pipe is communicated with an air compressor, and the flexible protection wall is integrally bound by using a rope; (4) inflating to form a bubble curtain;
wherein, the arrangement position of the protective device in the step (1) is that the diameter of the covering layer on the plane is 2-10m larger than that of the foundation pit, and the vertical plane is the area from the top of the covering layer to the water surface;
the protective panel in the step (2) comprises a layer of open-cell polyurethane foam panel, two layers of chloroprene rubber interlayers and an air interlayer, wherein the layers are tightly connected; both sides of the protection panel are connected with a protection reinforcing mesh through springs, and the upper side and the lower side of the protection reinforcing mesh are connected with connecting pieces;
wherein the thickness of the open-cell polyurethane foam panel is 10-20mm, the wave amplitude is 5-10mm, and the wave length-amplitude ratio is 2-5; the air interlayer is clamped between the two layers of chloroprene rubber interlayers and is tightly connected with the open-pore polyurethane foam panel, the surface of the wave-facing side of the air interlayer is conical and has the thickness of 10-20mm, rubber is used for waterproof treatment at the edge of the open-pore polyurethane foam panel, the thickness of the front chloroprene rubber interlayer positioned at the side of the air interlayer close to the foundation pit is 20-30mm, and the thickness of the rear chloroprene rubber interlayer positioned at the outermost side is 10-15 mm; each flexible protective wall is 5-12m in length and 5-30m in height relative to water depth.
2. The method for protecting the shock wave in the excavation water by the blasting of the seabed foundation pit according to claim 1, wherein: and (4) the bottom section steel in the step (3) is positioned at the bottom of the flexible protection wall and connected with the flexible protection wall through a connecting piece, and the length of the bottom section steel is 5-12 m.
3. The method for protecting the shock wave in the excavation water by the blasting of the seabed foundation pit according to claim 1, wherein: the steel pipes with holes in the step (3) are connected to the outer side of the bottom section steel, and are consistent in length and number with the bottom section steel; one end of the steel pipe with the hole is plugged, and the other end of the steel pipe with the hole is communicated with the high-pressure air pipe.
4. The method for protecting the shock wave in the excavation water by the blasting of the seabed foundation pit according to claim 1, wherein: wherein, the ropes in the step (3) are steel wires or common ropes, and are bound once every 3-6m from the outer side of the flexible protective wall from bottom to top, and the binding is carried out for 2-3 circles each time; or connecting adjacent protective reinforcing meshes by steel wires to form the whole protective panels; the whole protection device consists of 6-10 flexible protection walls, bottom section steel and steel pipes with holes, wherein the bottom section steel and the steel pipes are the same in number.
5. The method for protecting the shock wave in the excavation water by the blasting of the seabed foundation pit according to claim 1, wherein: and (4) inflating the perforated steel pipe through the high-pressure air pipe by using the air compressor to form a dense bubble curtain which stably rises.
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| CN112082441A (en) * | 2020-09-30 | 2020-12-15 | 广西新港湾工程有限公司 | Underwater blasting shock wave blocking device |
| CN112683121A (en) * | 2020-12-23 | 2021-04-20 | 温州大学 | Rigid shock absorption equipment for blasting in coastal sludge and laying method thereof |
| CN113324453B (en) * | 2021-06-21 | 2022-12-23 | 重庆交通大学 | Sea ditch reef blasting shock wave protection device with flexible drainage function |
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