Soil lifting damping structure and construction method

Abstract

A damping structure for impact protection of a collapsed structure comprises at least two earth embankments which are sequentially arranged in the preset collapsing direction of the structure with the bottom of the structure as the starting point, the earth embankments are formed by compacting filling soil in a layered mode, and the height of the earth embankments rises in a stepped mode in the preset collapsing direction of the structure so as to be matched with impact energy of different parts of a collapsed object; the frame is arranged in each section of earth embankment, and the frame comprises at least two metal net layers and a plurality of vertical connecting components used for connecting the adjacent metal net layers; the frame and the earth embankment cooperate to form an integrated force conduction system, and the frame converts local impact load into overall load, so that impact force is fully diffused from a contact area to the earth embankment, and efficient energy dissipation is achieved. Through a three-dimensional frame formed by the horizontal net layers and the vertical ribs, local impact force is instantly converted into planar and even body-shaped loads of the whole earth embankment body, most of earth filling materials jointly participate in plastic deformation and energy absorption, and the utilization rate of the earth embankment materials is remarkably increased.

Description

Technical Field

[0001] This invention relates to the field of blasting engineering technology, specifically to a soil-lifting vibration reduction structure and its construction method. Background Technology

[0002] In the demolition of tall structures (such as cooling towers, chimneys, and power generation towers), their collapse generates enormous impact forces and strong ground vibrations, posing a serious threat to surrounding buildings, underground pipelines, and the environment. Currently, the most common protective measure is to lay loose materials such as earthen embankments, sand layers, or cinders as a buffer layer within the predetermined collapse area. However, traditional buffer layers are passive buffers; only the local soil in direct contact with the collapsed structure participates in energy absorption, while most of the soil is not effectively utilized, resulting in low vibration reduction efficiency. To meet protection requirements, it is often necessary to construct massive earthen embankments, which not only increases costs and construction time but may also be difficult to implement due to site limitations. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that traditional buffer layers are passive buffers, where only the local soil in direct contact with the collapsed structure participates in energy absorption, and most of the soil is not effectively utilized, resulting in low vibration reduction efficiency. Therefore, this invention proposes a soil-lifted vibration reduction structure and construction method.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] A shock-absorbing structure for impact protection of collapsed structures includes: at least two earthen embankments, arranged sequentially along the predetermined collapse direction of the structure, starting from the bottom of the structure; the earthen embankments are composed of layered and compacted backfill, and their height increases in a stepped manner along the predetermined collapse direction of the structure to match the impact energy of different parts of the collapsed structure; a frame is installed inside each section of the earthen embankment, the frame including at least two layers of metal mesh and multiple vertical connecting members for connecting adjacent metal mesh layers; the frame and the earthen embankments work together to form an integrated force transmission system, the frame converting local impact loads into overall loads, allowing the impact force to diffuse from the contact area to the entire area of ​​the earthen embankment, achieving efficient energy dissipation.

[0006] As a further aspect of the present invention: the vertical connecting member is vertically inserted into the earthen embankment and is uniformly distributed in a grid pattern within the plane of the earthen embankment; both ends of the vertical connecting member are fixedly connected to the metal mesh layer, so that each metal mesh layer forms a continuous and cooperative horizontal force transmission surface.

[0007] As a further aspect of the present invention: the back impact surface of the metal mesh layer is covered with a surface protective net, which is a close-mesh flexible net with a mesh size of less than 1 cm, used to prevent soil particles from being lost from the earthen embankment and debris from splashing during the impact, thus ensuring the structural integrity of the earthen embankment.

[0008] As a further aspect of the present invention: an anchoring assembly is provided on the back side of the earthen embankment, the anchoring assembly including an anchor and a fastening rope; one end of the fastening rope is reliably connected to the lowest metal mesh layer of the frame, and the other end is fixed to the anchor, the anchor being buried in a stable foundation to improve the structure's resistance to impact and slippage.

[0009] As a further aspect of the present invention: one end of the fastening rope is fixedly connected to the bottommost metal mesh layer, the other end extends toward the back of the explosion side at a preset angle, and the end is firmly fixed in a stable foundation by an anchor, which is used to balance the horizontal thrust generated by the impact and prevent the overall structure from sliding or overturning.

[0010] As a further aspect of the present invention: the metal mesh layer is composed of multiple metal mesh modules and connectors; adjacent metal mesh modules are overlapped and the overlap is clamped and fixed by connectors to form a continuous metal mesh layer without interruption, ensuring the continuity of horizontal force transmission.

[0011] As a further aspect of the present invention: a buffer layer is laid on the top surface of the uppermost earthen embankment, the buffer layer covering the entire top surface of the earthen embankment, which is used to absorb the initial impact energy of the collapsed material in the first instance and prolong the impact time.

[0012] As a further aspect of the present invention: the buffer layer is composed of a polymer buffer material, wherein the polymer buffer material can be a tire, which is used to absorb the initial impact energy while preventing sharp fragments of the collapsed material from directly impacting and damaging the metal mesh layer and frame structure inside the embankment, thereby improving the overall protection reliability.

[0013] A construction method for a vibration damping structure includes the following steps: S1. Level and compact the construction site, and mark the layout of each section of the embankment, the installation reference of the internal frame, and the setting position of the boundary anchoring system according to the design requirements. S2. Lay and fix the surface protective net on the back side of the bottom metal mesh layer. After splicing the bottom metal mesh layer into shape, connect one end of the fastening rope of the boundary anchoring system. The other end of the fastening rope extends to a preset position and is fixed in the foundation by the anchor. The core definition of the back impact surface is: the surface on the side opposite to the impact direction of the blasted and collapsed material; S3. Backfill soil on top of the laid bottom layer of metal mesh, and compact it in layers to form a soil-filled sub-area. S4. Lay a protective net on the surface of the compacted fill area, then lay the upper metal mesh layer and splice it into shape. The upper and lower metal mesh layers are fixedly connected by vertical connecting components to form a three-dimensional force transmission unit. S5. Repeat steps S3 and S4 to sequentially complete the laying and vertical connection of multi-layer soil filling sub-areas, surface protective netting, and metal mesh layers until a complete three-dimensional force transmission framework is constructed. S6. Backfill the remaining soil above the top layer of metal mesh and compact it to the design elevation. Lay a flexible buffer layer on the top surface of the embankment.

[0014] As a further aspect of the present invention: in step S4, the vertical connecting member is a steel bar, the two ends of which are fixed to the adjacent metal mesh layers above and below by high-strength clamps or welding, and the vertical connecting members are evenly distributed in a grid pattern within the plane of the embankment.

[0015] The beneficial effects of this invention are: The three-dimensional framework composed of "horizontal mesh layer + vertical reinforcement" instantly transforms local impact force into a planar or even volumetric load on the entire embankment, enabling most of the fill material to participate in plastic deformation and energy absorption, thus significantly improving the utilization rate of the embankment material.

[0016] The aforementioned force transmission mechanism effectively reduces the peak stress in the impact zone and prolongs the duration of the impact load through large-scale plastic deformation of the soil, thus significantly reducing the peak impact force.

[0017] The segmented, stepped design precisely matches the impact energy distribution during the collapse of tall structures, achieving optimized allocation of protective resources. Under the same protection standards, it can significantly save on earthwork, substantially reducing project costs and site occupation.

[0018] Interlayer connection and boundary anchoring technology ensure that the composite structure will not collapse brittlely when subjected to huge dynamic impacts, but will work together as a whole with high safety redundancy. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram showing the location relationship between the debris from the blast and multiple earthworks; Figure 2 It is a cross-sectional view of the soil embankment; Figure 3 This is a top-down view of the cross-section of the earthwork.

[0021] In the diagram: 1. Debris from blasting; 2. Earthen embankment near the tower; 3. Middle section earthen embankment; 4. Far section earthen embankment; 5. Buffer layer; 6. Soil layer; 7. Metal mesh layer; 8. Vertical connecting component; 9. Fastening rope; 10. Anchor; 11. Connector. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] A shock-absorbing structure for impact protection of collapsed structures, comprising: At least two earthen mounds are sequentially installed starting from the bottom of the structure along the predetermined collapse direction of the structure, and the height of the earthen mounds increases in a stepped manner along the predetermined collapse direction of the structure; like Figure 1 As shown in this application, there are three soil embankments: soil embankment 2 for the tower entry section, soil embankment 3 for the middle section, and soil embankment 4 for the far section. Soil embankment 2 for the tower entry section is adjacent to the blasted collapse material 1.

[0024] like Figure 2 As shown in Figure 3, the frame is set inside the soil embankment, and the frame includes at least two layers of metal mesh 7 and a plurality of vertical connecting members 8 for connecting the connected metal mesh layers 7. Multiple vertical connecting components 8 are embedded in the soil embankment in a straight line at equal intervals.

[0025] The frame and the soil form an integrated structure to achieve three-dimensional transmission and diffusion of impact force. The frame is a three-dimensional force transmission frame.

[0026] Take the demolition of a 150-meter-high reinforced concrete power generation tower by blasting as an example.

[0027] Design and preparation phase: Based on the collapse area and vibration control requirements, three sections of earthen embankment were constructed in the direction of collapse: the section near the tower had a height of H1=2.0m, the middle section had a height of H2=3.5m, and the section far from the tower had a height of H3=5.0m. The top length of the earthen embankment was 2.5 times the maximum diameter of the tower, and the width was 1.5 times the maximum diameter of the tower.

[0028] The metal mesh layer 7 can be a steel wire mesh with a mesh size of 50mm × 50mm and a wire diameter of 5mm.

[0029] Vertical connecting member 8 is made of Φ16mm HRB400 threaded steel.

[0030] The fastening rope 9 can be a fixing cable, which is made of Φ20mm steel core wire rope.

[0031] Anchor 10 can specifically be an anchor block.

[0032] Construction phase (taking the far tower top section as an example): Step 1: Foundation treatment and layout. Level and compact the site, and accurately mark out the edge line of the embankment and the location of the anchor blocks.

[0033] Step Two: Laying the Substructure and Anchoring. A close-mesh protective net is laid on the back side of the bottom layer of wire mesh, followed by the bottom layer of wire mesh. The edges of the protective net are then tied and secured to the wire mesh. One end of the anchor cable is reliably connected to the edge of this layer of wire mesh, and the other end is pulled to the pre-set anchor block position and fixed with concrete.

[0034] Step 3: Backfilling and compaction. Backfill with soil to a thickness of approximately 1.35 meters and compact it in layers using a road roller.

[0035] Step 4: Lay the protective netting and the middle layer of wire mesh and establish vertical connections. Then, weld the lower end of the prefabricated vertical connecting bars to the bottom layer of wire mesh at the specified intervals, and pass the upper end through the middle layer of wire mesh and weld it to it.

[0036] Step 5: Repeat construction up to the top layer. Backfill and compact the 1.35-meter-thick soil again. Lay the third layer of protective netting and the (top layer) wire mesh. Weld the tops of all vertical connecting components 8 to the top layer wire mesh to complete the construction of the three-dimensional frame.

[0037] Step Six: Complete the filling and set up the buffer layer. Backfill the remaining soil and compact it to the design elevation. Finally, lay a buffer layer 5 made of waste tires on top.

[0038] To optimize the buffering effect and structural stability, the present invention can be further improved as follows: The wire mesh is selected with a mesh size of 50mm×50mm, which can form a sufficiently dense force transmission plane to ensure that the impact pressure is quickly dispersed, and can also effectively prevent the backfill in the embankment from being lost in large quantities through the mesh, thus maintaining the integrity and stability of the soil.

[0039] The wire mesh uses steel wire with a diameter of not less than 2mm. While ensuring that the mesh has excellent tensile strength and rigidity, it also takes into account the flexibility of the material, so that it can deform appropriately when subjected to impact to absorb energy, rather than fracture brittlely, thus achieving the best combination of strength and toughness.

[0040] The vertical connecting member 8 is made of HRB400 threaded steel bars, which have high yield strength and tensile strength, can reliably transmit huge impact shear force and tensile stress, and are widely available and cost-controllable, making them very suitable for large-scale engineering applications.

[0041] The surface protective netting is a close-mesh flexible protective net with mesh openings smaller than 1 cm. Before and after impact, it prevents soil particles from the surface and interior of the embankment from being lost through the mesh, ensuring the integrity of the embankment as a buffer material. Together with the wire mesh frame, it forms a flexible barrier that directly absorbs and encapsulates impact debris, effectively suppressing the high-speed splashing of soil and other construction materials, thus ensuring construction safety.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A shock-absorbing structure for impact protection of collapsed structures, characterized in that, include: At least two earthen mounds are set up sequentially along the predetermined collapse direction of the structure, starting from the bottom of the structure, and the height of the earthen mounds increases in a stepwise manner along the predetermined collapse direction of the structure; A frame is disposed inside the soil embankment, the frame comprising at least two layers of metal mesh (7) and a plurality of vertical connecting members (8) for connecting the connected metal mesh layers (7). The frame and the soil form an integrated structure to achieve three-dimensional transmission and diffusion of impact force.

2. The damping structure according to claim 1, characterized in that, The vertical connector (8) is vertically inserted into the embankment, and the metal mesh layer (7) is connected to the vertical connector (8). The metal mesh layer (7) is evenly distributed in a grid pattern within the plane of the embankment.

3. The vibration damping structure according to claim 1, characterized in that, A protective mesh layer is laid on the metal mesh layer (7).

4. The damping structure according to claim 1, characterized in that, The back impact surface of the soil embankment is also provided with an anchoring component, which includes an anchor (10) and a fastening rope (9). One end of the fastening rope (9) is connected to the frame and the other end is connected to the anchor (10).

5. The damping structure according to claim 4, characterized in that, One end of the fastening rope (9) is fixedly connected to the bottom metal mesh layer (7), and the other end extends outward at a preset angle. The end is fixed in a stable foundation by an anchor (10) to balance the horizontal thrust generated by the impact.

6. The vibration damping structure according to claim 1, characterized in that, The metal mesh layer (7) is composed of multiple metal mesh modules and connectors (11), and the joints of adjacent metal mesh modules are fixed by connectors (11).

7. The damping structure according to claim 1, characterized in that, A buffer layer (5) is also laid on top of the soil embankment.

8. A question according to claim 7, characterized in that, The buffer layer (5) is made of polymer buffer material and is used to absorb the initial impact energy and protect the metal mesh layer (7) inside the soil.

9. A construction method for a vibration-damping structure as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Level and compact the construction site, and mark the layout of each section of the embankment, the installation reference of the internal frame, and the setting position of the boundary anchoring system according to the design requirements. S2. Lay and fix the surface protective net on the back impact surface of the bottom metal mesh layer (7). After splicing the bottom metal mesh layer (7) into shape, connect one end of the fastening rope (9) of the boundary anchoring system. The other end of the fastening rope (9) extends to the preset position and is fixed in the foundation through the anchor (10). S3. Backfill soil on top of the laid bottom layer of metal mesh (7), and compact it in layers to form a soil filling sub-area; S4. Lay a protective net on the surface of the compacted fill area, then lay the upper metal mesh layer (7) and splice it into shape. The upper and lower metal mesh layers (7) are fixedly connected by vertical connecting components (8) to form a three-dimensional force transmission unit. S5. Repeat steps S3 and S4 to lay and vertically connect the multi-layer fill sub-area, surface protective net, and metal mesh layer (7) in sequence until a complete three-dimensional force transmission framework is constructed. S6. Backfill the remaining soil above the top metal mesh layer (7) and compact it to the design elevation. Lay a flexible buffer layer (5) on the top surface of the embankment.

10. The construction method according to claim 9, characterized in that, In step S4, the vertical connecting member (8) is a steel bar, and its two ends are fixed to the adjacent metal mesh layer (7) above and below by high-strength clamps or welding. The vertical connecting member (8) is evenly distributed in a grid pattern in the plane of the embankment.

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