A safe construction structure for blasting excavation of a power tower mountain soil-rock foundation pit

Abstract

The application relates to the technical field of mountain soil-rock foundation pit blasting excavation protection, in particular to a safe construction structure for power tower mountain soil-rock foundation pit blasting excavation, which comprises a foundation pit wellhead, a covering assembly arranged on the foundation pit wellhead and a fixed damping assembly arranged around the covering assembly, the covering assembly comprises, from bottom to top, a rigid protection net rack, a double-layered gun cover, a plurality of sandbags and a flexible blocking net, adjacent layers are detachably connected through ropes, the fixed damping assembly comprises at least four damping support rods and at least four damping line wheels, the damping support rods are used for buffering the rigid protection net rack, and the damping line wheels are used for pulling the flexible blocking net, the anti-sliding performance is comprehensively improved, the secondary collapse risk is reduced, the blasting operation is suitable for scenes such as slope surfaces, and the application has the characteristics of improving stability.

Description

Technical Field

[0001] This application relates to the field of protection technology for blasting excavation of foundation pits in mountainous soil and rock areas, and in particular to a safe construction structure for blasting excavation of foundation pits in mountainous soil and rock areas for power towers. Background Technology

[0002] Due to the special geological structure of deep rock layers, mountain foundation pits require blasting excavation. The pit opening formed by blasting is close to surrounding houses, and such environments place extremely high demands on the impact resistance, slope adaptability, and anti-secondary roll-off performance of the protective structure.

[0003] In related technologies, such as the blast hole covering structure disclosed in CN219869339U, a multi-layer stacked design of protective bags, protective plates, clamping devices and protective nets is used. It is suitable for blast protection on flat pit bottoms. It suppresses flying rocks by compacting the protective plates with gravity, but it cannot solve the problem of slope cover slippage. Other conventional methods include sandbag stacking protective walls or wire mesh anchoring coverings. The former relies on mass energy dissipation but is easily overturned by shock waves, while the latter can be fixed but lacks a buffer layer.

[0004] The existing protective structures have the following problems: poor bonding and fixing ability with slopes and other terrains, and the blasting vibrations can easily cause the entire covering structure to slip. Utility Model Content

[0005] To improve safety, this application provides a safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock terrain.

[0006] The technical solution provided in this application for a safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock terrain adopts the following:

[0007] A safe construction structure for blasting excavation of power tower foundation pits in mountainous terrain includes a pit opening, a covering assembly installed on the pit opening, and a fixed damping assembly installed around the covering assembly. The covering assembly includes a rigid protective net frame, a double-layer blasting sheet, multiple sandbags, and a flexible barrier net stacked sequentially from bottom to top. Adjacent layers are detachably connected by rope chains. The fixed damping assembly includes at least four damping struts and at least four damping pulleys. The damping struts are used to buffer the rigid protective net frame, and the damping pulleys are used to pull the flexible barrier net.

[0008] By adopting the above scheme, a multi-layered composite protective structure is used to intercept and dissipate the impact energy generated by the explosion. Damping struts and damping sheaves work together to buffer and reinforce the blast, reducing the likelihood of slippage of the covering components or secondary rockfalls, improving anti-slip performance, and achieving safe control of blasting operations.

[0009] Preferably, the rigid protective mesh frame is a rectangular frame structure, with its skeleton and frame made of 16mm threaded steel, and a metal mesh made of 6mm round steel welded and fixed to its surface.

[0010] By adopting the above scheme, the skeleton and frame made of rebar provide core support, which can effectively resist the kinetic energy impact of blast shock waves and flying rock fragments, and intercept large pieces of gravel from penetrating. The round steel metal mesh absorbs the impact energy of the gravel fragments through elastic deformation, disperses local stress, and reduces damage to the overall structure.

[0011] Preferably, the double-layer gun is formed by weaving two composite rubber braided layers from waste tire strips.

[0012] By adopting the above scheme, the double-layer rubber braided layer serves as an energy dissipation layer, which absorbs and attenuates the impact energy at the moment of explosion through elastic deformation, effectively mitigating the spread range and intensity of the shock wave.

[0013] Preferably, one end of the damping strut is inserted into the ground around the pit opening, and the other end is hinged to the rigid protective net frame, and the damping wheel is fixedly connected to the flexible barrier net.

[0014] By adopting the above scheme, the damping bracket forms a rigid anchor point, reducing the occurrence of overall displacement or overturning of the covering components. The damping wheel maintains the tension of the flexible barrier net by adjusting the tension, thereby ensuring the net's interception efficiency against flying stones.

[0015] Preferably, the damping strut includes a vertically extending mounting rod and a fixed rod connected to the lower part of the mounting rod. The side wall of the mounting rod is provided with a damping slide rail, and a slider is slidably mounted on the damping slide rail. The slider is detachably connected to the rigid protective net frame by a hinge.

[0016] By adopting the above scheme, the insertion rod is inserted into the ground around the pit opening to form a fixed support point. The detachable hinge design facilitates quick inspection or replacement after blasting, improving convenience and reusability.

[0017] Preferably, a first winding wheel and a second winding wheel are respectively provided on both sides of the end of the mounting rod near the insertion rod, and a third winding wheel is provided at the other end of the mounting rod.

[0018] By adopting the above scheme, multiple fixed support points can be formed by winding ropes or steel wires through each winding wheel, thereby reducing the occurrence of overall tilting of the damping support rod and improving overall stability.

[0019] Preferably, the damping reel includes a fixed tip and a damping wheel rotatably connected to the upper end of the fixed tip. A nylon rope is wound around the damping wheel, and the nylon rope sequentially passes around the second winding reel, the third winding reel, and the first winding reel, and is fixedly connected to the flexible barrier net.

[0020] By adopting the above solution, the tension and distribution uniformity of the nylon rope are increased, while the slack and displacement of the rope and net are suppressed, and the tensile strength is improved, making it suitable for blast protection or impact interception scenarios.

[0021] Preferably, the pit opening is configured in a funnel shape, wider at the top and narrower at the bottom.

[0022] By adopting the above scheme, it is easier to place explosives, and the gradually changing cross section disperses the stress on the well wall, reducing the risk of collapse or deformation caused by local stress concentration.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By utilizing a multi-layered composite protective structure to intercept and dissipate the impact energy generated by the explosion, and by using a friction damping mechanism to reduce overall vibration and improve anti-slip performance, the safety control of blasting operations can be achieved.

[0025] 2. Improved the tensile strength and flying stone interception efficiency of the device;

[0026] 3. Improved the ease of maintenance and structural stability of the device. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0028] Figure 2 This is an exploded structural diagram of the components covered by the embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the overall structure of the fixed damping component in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram illustrating a usage scenario of an embodiment of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Pit opening; 2. Covering assembly; 21. Rigid protective net frame; 22. Double-layer blasting cover; 23. Sandbag; 24. Flexible barrier net; 3. Fixed damping assembly; 31. Damping support rod; 311. Mounting rod; 312. Damping slide rail; 313. Slider; 314. Third winding wheel; 315. Inserted rod; 316. First winding wheel; 317. Second winding wheel; 32. Damping sheave; 321. Damping wheel; 322. Fixed tip. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0033] This application discloses a safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock terrain. (Refer to...) Figure 1-2 A safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock includes a foundation pit opening 1, a covering component 2 covering the foundation pit opening 1, and fixed damping components 3 distributed around the covering component 2. The covering component 2 includes a rigid protective net frame 21, a double-layer blasting cover 22, multiple sandbags 23, and a flexible barrier net 24 stacked sequentially from bottom to top. Adjacent layers are detachably connected by rope chains.

[0034] Correspondingly, the rigid protective net frame 21 serves as the bottom support, providing an initial impact barrier to restrain large rock fragments from scattering; the double-layered blasting shell 22 is superimposed to buffer the blasting stress wave and attenuate the instantaneous impact force generated by the explosion; multiple sandbags 23 are layered to stabilize the structure and offset the kinetic energy of flying rocks through mass inertia, reducing the vibration amplitude; the flexible barrier net 24 serves as the top layer of interception, absorbing residual kinetic energy through elastic deformation to prevent small fragments from being ejected.

[0035] Furthermore, each protective layer in the covering component 2 is connected by a detachable rope chain to achieve modular quick assembly and disassembly. At the same time, the fixed damping component 3 is anchored to the surrounding soil layer, and the friction damping mechanism is used to suppress the overall slippage of the covering component 2, thereby enhancing the structural stability.

[0036] In summary, this device utilizes a multi-layered composite protective structure to intercept the scattering of rock masses of varying sizes and attenuate the impact energy generated by the explosion. Combined with fixed damping components 3, it reduces overall vibration, effectively improving anti-slip performance and energy dissipation rate, reducing the safety risks caused by secondary rolling of the covering material, and a 4-person team can complete the standard foundation pit protection deployment within 90 minutes. It has excellent installation timeliness and is suitable for blasting operations on slopes and other terrains.

[0037] Specifically, in this embodiment, the rigid protective net frame 21 adopts a square frame structure with a side length of 2.5m. Its skeleton and frame are made of 16mm threaded steel, and a 10cm*10cm metal mesh made of 6mm round steel is welded and fixed on the surface.

[0038] Therefore, the rigid protective mesh 21, as the bottom protective interface, enhances the blast resistance of the covering component 2. It forms a stable barrier through a square frame structure, which physically constrains the displacement range of loose rock mass after blasting, reducing the risk of large-scale spread of collapsed material. The skeleton and frame made of rebar provide core support, which can effectively resist the kinetic energy impact of blast shock waves and flying rock fragments, and intercept large pieces of debris from penetrating. The round steel metal mesh absorbs the impact energy of broken rock through elastic deformation, disperses local stress, and reduces damage to the overall structure.

[0039] Furthermore, the double-layer cannon 22 is made of two combined rubber woven layers formed by discarded tire strips, which cover the rigid protective net frame 21 to completely seal the gaps in the net frame, forming a high-strength barrier to intercept the debris and flying objects generated by the blast, reduce damage to personnel and the surrounding environment, and improve safety.

[0040] Furthermore, the double-layer cannon 22 can serve as an energy dissipation layer. It absorbs and attenuates the impact energy of the explosion through elastic deformation, effectively mitigating the spread range and intensity of the shock wave. At the same time, the waste tire strips are heavy and not easily overturned by the blast wave, ensuring the stability of the coverage position. They also have high toughness and wear resistance, enabling them to maintain their protective effectiveness during continuous blasting without easily breaking, thus reducing maintenance costs.

[0041] On the other hand, refer to Figure 3 In this embodiment, the fixed damping assembly 3 includes four damping rods 31 and four damping wheels 32. One end of each of the four damping rods 31 is inserted into the ground around the four corners of the covering assembly 2, and the other end is hinged to the rigid protective net frame 21. The damping wheels 32 are fixedly connected to the flexible barrier net 24.

[0042] Specifically, the damping strut 31 includes a vertically extending mounting rod 311 and a plug rod 315 connected below the mounting rod 311. A damping slide rail 312 is fixed to the side wall of the mounting rod 311. A slider 313 is slidably mounted on the damping slide rail 312. The slider 313 is detachably connected to the rigid protective net frame 21 via a hinge.

[0043] Therefore, the insertion rod 315 is inserted into the ground around the pit opening 1 to form a rigid anchor point. In conjunction with the hinged structure of the installation rod 311 and the rigid protective net frame 21, the rigid protective net frame 21 is allowed to swing and slide slightly under impact load, reducing the risk of rigid fracture of the structure. At the same time, it maintains the interception function of the frame without dislodging, reducing the occurrence of overall displacement or overturning of the covering component 2, and maintaining stable anchoring under blasting impact.

[0044] Furthermore, the sliding mechanism of the damping slide rail 312 and the slider 313 generates controllable friction. The relative movement of the slider 313 on the slide rail converts the impact kinetic energy into heat energy for dissipation, reducing the vibration energy transmitted to the rigid protective net frame 21. The detachable hinge design facilitates quick repair or replacement after blasting, improving the reuse rate.

[0045] In addition, a first winding wheel 316 and a second winding wheel 317 are fixed on both sides of the end of the mounting rod 311 near the insertion rod 315, and a third winding wheel 314 is fixed on the other end of the mounting rod 311.

[0046] Furthermore, the damping reel 32 includes a fixed tip 322 and a damping wheel 321 rotatably connected to the upper end of the fixed tip 322. A nylon rope is wound on the damping wheel 321. The nylon rope passes through the second winding reel 317, the third winding reel 314 and the first winding reel 316 in sequence, and is fixedly connected to the flexible barrier net 24.

[0047] Therefore, the first winding wheel 316 and the second winding wheel 317 form a lateral fixed support point by winding nylon rope to enhance the anti-overturning ability of the damping rod 31 and reduce the occurrence of force deviation of the rod. At the same time, by utilizing the tension adjustment mechanism of the rope, the tension of the flexible barrier net 24 is always maintained, reducing the risk of net loosening or dislocation, and assisting in absorbing the residual kinetic energy under the impact of an explosion. It is suitable for blast protection or impact interception scenarios.

[0048] Furthermore, the nylon rope forms a meandering path by winding between the second winding wheel 317, the third winding wheel 314, and the first winding wheel 316, which increases the tension and uniformity of the rope, reduces the occurrence of rope slack or deviation, and improves tensile strength. In addition, the nylon material has high wear resistance, self-lubrication and corrosion resistance, low maintenance requirements, and is easy to maintain stable resistance during long-term use.

[0049] On the other hand, refer to Figure 4 The pit wellhead 1 is designed with a trumpet-shaped structure that is wider at the top and narrower at the bottom. By expanding the space above the wellhead, it is easier to place explosives and clean up debris. At the same time, the gradually changing cross-section of the wellhead disperses the stress on the well wall, reducing the risk of collapse or deformation caused by local stress concentration, and indirectly improving the durability of the device.

[0050] The implementation principle of a safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock formations according to an embodiment of this application is as follows: The device adopts a composite protective layer structure to grade and impede flying rock fragments of different particle sizes, and absorbs the blast shock wave through material deformation and damping structure, thereby improving the shock wave attenuation rate and energy dissipation efficiency. In conjunction with the fixed damping component 3, it suppresses the vibration displacement of the protective layer, improves the anti-slip performance, reduces the risk of secondary rock collapse, and takes into account the protective effectiveness, construction convenience and reusability. It is especially suitable for the safety protection needs of blasting scenarios such as slopes.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock terrain, characterized in that, The system includes a pit opening (1), a cover assembly (2) set on the pit opening (1), and a fixed damping assembly (3) set around the cover assembly (2). The cover assembly (2) includes a rigid protective net frame (21), a double-layer blasting sheet (22), multiple sandbags (23), and a flexible barrier net (24) stacked from bottom to top. Adjacent layers are detachably connected by rope chains. The fixed damping assembly (3) includes at least four damping rods (31) and at least four damping pulleys (32). The damping rods (31) are used to buffer the rigid protective net frame (21), and the damping pulleys (32) are used to pull the flexible barrier net (24).

2. The safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 1, characterized in that, The rigid protective net frame (21) is a rectangular frame structure, with its skeleton and frame made of 16mm threaded steel, and a metal mesh made of 6mm round steel welded and fixed on its surface.

3. The safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 2, characterized in that, The double-layer gun cover (22) is made of waste tire strips to form two combined rubber braided layers.

4. The safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 1, characterized in that, One end of the damping strut (31) is inserted into the ground around the pit opening (1), and the other end is hinged to the rigid protective net frame (21). The damping wheel (32) is fixedly connected to the flexible barrier net (24).

5. A safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 4, characterized in that, The damping support rod (31) includes a vertically extending mounting rod (311) and a plug rod (315) connected to the lower part of the mounting rod (311). The side wall of the mounting rod (311) is provided with a damping slide rail (312). A slider (313) is slidably provided on the damping slide rail (312). The slider (313) is detachably connected to the rigid protective net frame (21) by a hinge.

6. A safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 5, characterized in that, The mounting rod (311) is provided with a first winding wheel (316) and a second winding wheel (317) on both sides of the end near the insertion rod (315), and a third winding wheel (314) is provided at the other end of the mounting rod (311).

7. A safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 6, characterized in that, The damping reel (32) includes a fixed tip (322) and a damping wheel (321) rotatably connected to the upper end of the fixed tip (322). A nylon rope is wound on the damping wheel (321). The nylon rope passes through the second winding reel (317), the third winding reel (314) and the first winding reel (316) in sequence, and is fixedly connected to the flexible barrier net (24).

8. A safe construction structure for blasting excavation of power tower foundation pits in mountainous soil and rock areas according to claim 1, characterized in that, The pit wellhead (1) is designed in a funnel shape, wider at the top and narrower at the bottom.

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