A vibration reduction floating structure and construction method for a building over subway

Abstract

The present invention provides a vibration reduction floating structure and a construction method for a building above a subway. The vibration reduction floating structure includes a vibration reduction technical floor formed by splicing a plurality of vibration reduction bottom plates with a modified asphalt waterproof coiled material. At each side wall of the vibration reduction technical floor, a first filling plate is horizontally arranged, and a second filling plate is vertically arranged directly above the first filling plate. The vibration reduction bottom plate includes an upper bearing plate and a lower bearing plate arranged in parallel from top to bottom. Between the upper bearing plate and the lower bearing plate, a plurality of mutually parallel triangular structure units are sequentially arranged from one end to the other end. The triangular structure unit includes two arc-shaped plates that are concave downward and arranged back to back. A through hole is formed between the two arc-shaped plates, and a plurality of elastic rubbers are filled at intervals in the through hole, and springs are embedded in the elastic rubbers. The vibration reduction floating structure of the present invention can effectively reduce the low-frequency vibration caused by Rayleigh waves transmitted through the soil during the operation of the train, and has a long service life, a low replacement frequency, and a low use cost.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration reduction for over-track buildings in subways, and particularly to a vibration reduction floating structure and construction method for over-track buildings in subways. Background Art

[0002] With the rapid development of urban underground rail transit construction, the situation where above-ground buildings are adjacent to or coincide with underground rail transit is becoming more and more common. The vibration generated during the operation of underground trains will be transmitted to the above-ground buildings located above the underground rail transit through the tunnel structure and the soil around the tunnel, thereby causing the vibration of the above-ground buildings, affecting the normal and comfortable life of the occupants in the buildings. In some special places such as hospitals or scientific research institutions where precision instrument equipment is stored, it will cause large deviations in detection data and experimental results, and such long-term vibration may even pose a safety hazard to the above-ground buildings.

[0003] The existing technologies are not satisfactory in reducing the vibration generated when trains pass through by the soil structure, and some may even produce uncontrollable vibration amplification areas, attracting complaints from many occupants in the above-ground buildings. The invention patent with the application number CN202123174515.8 discloses a combined sound insulation and vibration reduction floating floor. Due to the high self-weight characteristic of the building, the vibration reduction cushion material in the present invention may bear overload stress and fail to achieve an effective vibration reduction effect. If a vibration reduction cushion material with too high elastic modulus is used, it cannot fully meet the vibration reduction requirements in the required frequency bands, resulting in a single vibration isolation frequency band and even being unable to reduce low-frequency vibration. Moreover, the bottom floor slab or steel plate of the building using this patented technology is prone to fracture under the long-term vibration of the soil surface wave and lose the vibration reduction effect. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the existing technologies, and propose a vibration reduction floating structure and construction method for over-track buildings in subways, so as to solve the problems that the existing vibration reduction solutions have poor low-frequency vibration reduction effects and the bottom floor slab or steel plate of the building is prone to fracture under the long-term vibration of the soil surface wave.

[0005] The present invention provides a vibration reduction floating structure for over-track buildings in subways, including a first filling plate, a second filling plate, and a vibration reduction technical floor slab formed by splicing a plurality of vibration reduction bottom plates with a modified asphalt waterproof coiled material;

[0006] The first filling plates are horizontally arranged at the side walls of the vibration reduction technical floor slab, the second filling plates are vertically arranged directly above the first filling plates, and the bottom of the second filling plates is connected to the first filling plates;

[0007] The upper surface of the vibration damping technical floor slab is used to connect with the bottom surface of the subway superstructure located in the soil structure through a modified asphalt waterproof coiled material; the inner side of each second filling plate is used to connect with the outer side of the outer wall of the subway superstructure located in the soil structure, and its outer side is used to connect with the soil structure;

[0008] Among them, the material of the first filling plate is road-grade compacted asphalt, and the second filling plate is made of recycled coarse aggregate wrapped with polyurethane and cement mortar fully mixed;

[0009] The vibration damping floor slab includes an upper bearing plate and a lower bearing plate arranged in parallel from top to bottom, and a plurality of mutually parallel triangular structure units are sequentially arranged between the upper bearing plate and the lower bearing plate from one end to the other end;

[0010] The triangular structure unit includes two concave and back-to-back arc-shaped plates. The upper end of the arc-shaped plate is connected to the upper bearing plate, and the lower end is connected to the lower bearing plate, so that a through hole is formed between the two arc-shaped plates. A plurality of elastic rubbers are filled at intervals from one end to the other end in the through hole, and a spring extending from one end to the other end is embedded in the elastic rubber.

[0011] Preferably, three non-connected stress plates are also embedded in the elastic rubber, and the stress plates are respectively fixed on the peripheral surface of the spring, so that the cross-sections of the three stress plates coincide with the equilateral triangle sharing the side.

[0012] Further preferably, the stress plate is a high-strength low-alloy structural steel with a strength of Q345 - Q420 or above grade C.

[0013] Preferably, the upper bearing plate and the lower bearing plate are high-strength low-alloy structural steels with a strength of Q345 - Q420 or above grade C;

[0014] The arc-shaped plate is a high-strength low-alloy structural steel with a strength of Q650 or above grade C;

[0015] The spring is a high-strength low-alloy structural steel with a strength of Q500 or above grade C;

[0016] The elastic rubber is a polyurethane rubber with a Shore hardness of above 85A.

[0017] Preferably, the modified asphalt waterproof coiled material is an SBS modified asphalt waterproof coiled material.

[0018] Preferably, the distance between every two elastic rubbers is equal.

[0019] For the above-mentioned vibration damping floating structure of the subway superstructure, the present invention also provides a construction method applicable to existing buildings, including:

[0020] Step 1: Excavate the soil within the first preset width around the outer wall of the above-ground subway building downward to a preset depth below the bottom floor slab of the building to form a construction space;

[0021] Step 2: Excavate the soil directly below the bottom floor slab of the building from the preset depth in the second preset width from one end to the other end to form a first channel;

[0022] Step 3: In the construction space opposite to the first channel, a first track is supported by a support member. Multiple vibration damping floor slabs are spliced on the first track to form a first floor slab. A modified asphalt waterproof coiled material is installed on the upper surface of the first floor slab, and then the first track and the first floor slab are pushed together to the first end of the first channel;

[0023] Step 4: In the construction space opposite to the first channel, a second track is supported by a support member. Multiple vibration damping floor slabs are spliced on the second track to form a second floor slab. A modified asphalt waterproof coiled material is installed on the upper surface of the second floor slab, and then the second track and the second floor slab are pushed into the first channel and correspondingly docked with the first track and the first floor slab;

[0024] The third track and the third floor slab are fabricated according to the above method and completed the corresponding docking with the second track and the second floor slab,... and so on until the Nth floor slab reaches the second end of the first channel;

[0025] Step 5: Pressure-fill cement mortar under each vibration damping floor slab in the first channel to jack up each vibration damping floor slab until the modified asphalt waterproof coiled material on its upper surface is in close contact with the lower surface of the bottom floor slab of the building, and wait for the filled cement mortar to solidify;

[0026] Step 6: Adjacent to the first channel, excavate from the preset depth in the second preset width from one end to the other end of the soil directly below the bottom floor slab of the building to form a second channel, and a plurality of vibration damping floor slabs extending from its first end to the second end are arranged in the second channel in the same manner as in Steps 3 and 4;

[0027] The modified asphalt waterproof coiled material on the upper surface of each vibration damping floor slab in the second channel is in close contact with the lower surface of the bottom floor slab of the building in the same manner as in Step 5, and wait for the filled cement mortar to solidify;

[0028] Step 7: Construct a third channel adjacent to the second channel in the same manner as in Step 6, and vibration damping floor slabs are arranged from its first end to the second end in the third channel in the same manner as in Step 6;... and so on until all the soil within the preset depth directly below the bottom floor slab of the building is replaced to form a vibration damping technical floor slab;

[0029] Step 8: Filling the side walls of the vibration reduction technical base plate with hot-mixed road-grade compacted asphalt of a third preset width, and making the upper surface of the filled road-grade compacted asphalt flush with the upper surface of the vibration reduction technical base plate, and leaving the road-grade compacted asphalt to cool and solidify, thereby forming a first filling plate;

[0030] Step 9: Fill the construction space directly above the first filling plate with a mixture of polyurethane and recycled coarse aggregate that is fully mixed by hot mixing, let the mixture stand until it hardens, then inject cement mortar, and then wait for it to cool, thus forming a second filling plate;

[0031] Step 10: Backfill the remaining gaps in the construction space.

[0032] Preferably, in step 8, after the asphalt is compacted at the filling road level, it is fully rammed and then left to stand to cool and solidify.

[0033] Preferably, in step 9, when filling the mixture, the mixture is hammered until it no longer sinks, and then left to harden.

[0034] With respect to the above-mentioned vibration-damping floating structure of a subway superstructure, the present invention further provides a construction method applicable to a new building, including:

[0035] Step 1: After the concrete foundation of the subway building is constructed at a preset buried depth, a vibration-damping base plate is laid on the upper surface of the concrete foundation in the mutually perpendicular X and Y directions, and adjacent vibration-damping base plates are spliced by modified asphalt waterproofing membranes to form the vibration-damping technical base plate, and a modified asphalt waterproofing membrane is arranged on the upper surface of the vibration-damping technical base plate, and then the building is constructed upwards on the modified asphalt waterproofing membrane on the upper surface of the vibration-damping technical base plate;

[0036] Step 2: Filling the side walls of the vibration reduction technical base plate with hot-mixed road-grade compacted asphalt of a third preset width, and making the upper surface of the filled road-grade compacted asphalt flush with the upper surface of the vibration reduction technical base plate, and leaving the road-grade compacted asphalt to cool and solidify, thereby forming a first filling plate;

[0037] Step 3: Fill the space at the preset burial depth directly above the first filling plate with a mixture of polyurethane and recycled coarse aggregate that is fully mixed by hot mixing, let it stand until the filled mixture hardens, then inject cement mortar, and then wait for it to cool, thus forming a second filling plate.

[0038] It can be seen from the above technical solutions that the present invention has the following advantages:

[0039] A vibration reduction floating structure for a building above a subway provided by the present invention. The vibration reduction bottom plate includes an upper bearing plate, a lower bearing plate, and triangular structure units located between the upper bearing plate and the lower bearing plate. The second filling plate is made of recycled coarse aggregate wrapped with polyurethane and cement mortar fully mixed. Experiments prove that both the vibration reduction bottom plate and the second filling plate of this structure have good low-frequency vibration reduction capabilities. By setting the first filling plate, lateral stress buffering is provided for the upper bearing plate and the lower bearing plate, preventing them from cracking and slipping, and ensuring the structural stability of the vibration reduction bottom plate. The vibration reduction technical bottom plate is composed of multiple vibration reduction bottom plates spliced together by modified asphalt waterproof coiled materials. This splicing structure can separately handle the vibration loads at different positions of the bottom floor slab or steel plate of the building above the subway, alleviating the phenomenon of uneven stress on the bottom floor slab or steel plate of the building above the subway, and effectively preventing the bottom floor slab or steel plate of the building above the subway from breaking and failing due to the wavy uneven cyclic load applied by Rayleigh waves. Thus, the vibration reduction floating structure of the present invention can effectively reduce the low-frequency vibration caused by Rayleigh waves transmitted through the soil during train operation, solving the problems of poor low-frequency vibration reduction effect in existing vibration reduction schemes and the easy fracture of the bottom floor slab or steel plate of the building above the subway under the long-term vibration action of surface waves of the soil.

[0040] Through the arc-shaped plate, the elastic rubber can be stressed on three sides, enabling the elastic rubber to share the vibration load of the arc-shaped plate. On the one hand, it can slow down the aging of steel under repeated loads, improve the service life of the vibration reduction bottom plate, thereby reducing the replacement frequency of the vibration reduction bottom plate and the use cost of the vibration reduction floating structure. On the other hand, it also improves the bearing capacity of the vibration reduction floating structure.

[0041] By splicing the vibration reduction bottom plates with modified asphalt waterproof coiled materials, each vibration reduction bottom plate has a reset ability, and the vibration reduction technical bottom plate is connected to the building above the subway through the modified asphalt waterproof coiled materials. On the one hand, it can eliminate the friction vibration between the vibration reduction bottom plates and between the vibration reduction technical bottom plate and the bottom floor slab or steel plate of the building above the subway, effectively preventing the vibration reduction floating structure from generating secondary vibration. On the other hand, it also improves the stability of the vibration reduction floating structure.

[0042] In addition, the present invention respectively provides construction methods for the vibration reduction floating structure of the building above the subway for existing buildings and newly built buildings. The construction operation is simple, with strong feasibility and practicability, and a wide range of applications. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0044] Figure 1 It is a schematic structural diagram of the use state of a vibration reduction floating structure of a subway superstructure building provided in Embodiment 1 of the present invention;

[0045] Figure 2 It is a schematic structural diagram of a vibration reduction bottom plate structure of a vibration reduction floating structure of a subway superstructure building provided in Embodiment 1 of the present invention;

[0046] Figure 3 For Figure 2 the cross-sectional view in

[0047] Figure 4 It is a layout diagram of a rubber-rigid ring structure of a vibration reduction floating structure of a subway superstructure building provided in Embodiment 1 of the present invention;

[0048] Figure 5 It is a schematic construction state diagram of a construction method of a vibration reduction floating structure of the above-mentioned subway superstructure building provided in Embodiment 2 of the present invention;

[0049] Figure 6 It is a flow chart of a construction method of a vibration reduction floating structure of the above-mentioned subway superstructure building provided in Embodiment 2 of the present invention (for existing buildings);

[0050] Figure 7 It is a flow chart of a construction method of a vibration reduction floating structure of the above-mentioned subway superstructure building provided in Embodiment 3 of the present invention (for newly built buildings);

[0051] Among them, the description of the reference numerals: the first filling plate 1, the second filling plate 2, the vibration reduction bottom plate 3, the upper bearing plate 301, the lower bearing plate 302, the arc plate 303, the through hole 304, the elastic rubber 305, the spring 306, the stress plate 307, the vibration reduction technical bottom plate 4, the modified asphalt waterproof coiled material 5, the subway superstructure building 6, the soil body 7, the first track 8, the second track 9, the third track 10, the cement mortar 11, the rubber-rigid ring structure 12. Detailed implementation manners

[0052] To make the objectives, features, and advantages of the present invention more apparent and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0053] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", and "outer" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0054] Unless otherwise clearly specified and defined, the terms "connected", "fixed", and "arranged" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be a connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0055] In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", and "third" may explicitly or implicitly include one or more of such features. Unless otherwise specifically defined.

[0056] Embodiment 1 of the present invention provides a vibration reduction floating structure for a building above a subway, as Figures 1 to 3 shown, including: a first filling plate 1, a second filling plate 2, and a vibration reduction technical bottom plate 4 formed by splicing a plurality of vibration reduction bottom plates 3 with a modified asphalt waterproof coil 5;

[0057] A first filling plate 1 is horizontally arranged at each side wall of the vibration reduction technical bottom plate 4, a second filling plate 2 is vertically arranged directly above the first filling plate 1, and the bottom of the second filling plate 2 is connected to the first filling plate 1;

[0058] The upper surface of the vibration reduction technical bottom plate 4 is used to be connected to the bottom surface of the building above the subway 6 in the soil body 7 structure through a modified asphalt waterproof coil 5; the inner side of each second filling plate 2 is used to be connected to the outer side of the outer wall of the building above the subway 6 in the soil body 7 structure, and its outer side is used to be connected to the soil body 7 structure;

[0059] Among them, the first filling plate 1 is made of road-level compacted asphalt, that is, compacted asphalt with a penetration of 60-80 at 100g and an elastic recovery of more than 60 at 25°C. The second filling plate 2 is composed of recycled coarse aggregates wrapped with polyurethane and cement mortar fully mixed;

[0060] The vibration damping bottom plate 3 includes an upper bearing plate 301 and a lower bearing plate 302 arranged in parallel from top to bottom. Between the upper bearing plate 301 and the lower bearing plate 302, a plurality of mutually parallel triangular structural units are arranged in sequence from one end to the other end;

[0061] The above triangular structural unit includes two arc-shaped plates 303 that are concave downward and arranged back to back. The upper end of the arc-shaped plate 303 is connected to the upper bearing plate 301, and the lower end is connected to the lower bearing plate 302, so that a through hole 304 is formed between the two arc-shaped plates 303. A plurality of elastic rubbers 305 are filled at intervals from one end to the other end in the through hole 304, and a spring 306 extending from one end to the other end is embedded in the elastic rubber 305.

[0062] It should be noted that in the field of vibration research of subway superstructure buildings, the low-frequency vibration range is usually 4-80Hz, and the high-frequency vibration range is usually above 200Hz. A vibration damping floating structure for subway superstructure buildings provided by an embodiment of the present invention, the vibration damping bottom plate 3 includes an upper bearing plate 301, a lower bearing plate 302 and triangular structural units located between the upper bearing plate 301 and the lower bearing plate 302. The second filling plate 2 is composed of recycled coarse aggregates wrapped with polyurethane and cement mortar fully mixed. Experiments prove that both the vibration damping bottom plate 3 and the second filling plate 2 of this structure have good low-frequency vibration damping capabilities, and by setting the first filling plate 1 to provide lateral stress buffering for the upper bearing plate 301 and the lower bearing plate 302, preventing them from cracking and slipping, ensuring the structural stability of the vibration damping bottom plate 3; the vibration damping technical bottom plate 4 is spliced by a plurality of vibration damping bottom plates 3 through a modified asphalt waterproofing membrane 5. This splicing structure can separately process the vibration loads at different positions of the bottom floor slab or steel plate of the subway superstructure building 6, alleviating the phenomenon of uneven stress on the bottom floor slab or steel plate of the subway superstructure building 6, and effectively preventing the bottom floor slab or steel plate of the subway superstructure building 6 from cracking and failing due to the wave-shaped uneven cyclic load applied by the Rayleigh wave, so that the vibration damping floating structure of the present invention can effectively reduce the low-frequency vibration caused by the Rayleigh wave transmitted through the soil body 7 during the operation of the train, solving the problem that the existing vibration damping scheme has poor low-frequency vibration damping effect, and the bottom floor slab or steel plate of the subway superstructure building 6 is prone to cracking under the long-term vibration action of the surface wave of the soil body 7;

[0063] Through the arc-shaped plate 303, the elastic rubber 305 can be stressed on three sides, enabling the elastic rubber 305 to share the vibration load of the arc-shaped plate 303. On the one hand, it can slow down the aging of steel under repeated loads, improve the service life of the vibration damping bottom plate 3, thereby reducing the replacement frequency of the vibration damping bottom plate 3 and the usage cost of the vibration damping floating structure. On the other hand, it also improves the bearing capacity of the vibration damping floating structure;

[0064] By splicing the vibration damping bottom plate 3 with the modified asphalt waterproofing membrane 5, each vibration damping bottom plate 3 has the ability to reset, and the vibration damping technical bottom plate 4 is connected to the subway superstructure 6 through the modified asphalt waterproofing membrane 5. On the one hand, it can eliminate the frictional vibration between the vibration damping bottom plates 3 and between the vibration damping technical bottom plate 4 and the bottom floor slab or steel plate of the subway superstructure 6, effectively preventing the secondary vibration of the vibration damping floating structure. On the other hand, it also improves the stability of the vibration damping floating structure.

[0065] Among them, while the modified asphalt waterproofing membrane 5 has toughness and adhesiveness, it also has sufficient extensibility, enabling the vibration damping bottom plate 3 to exert its effectiveness. Specifically, SBR latex modified asphalt waterproofing membrane 5, TLA modified lake asphalt waterproofing membrane, SBS modified asphalt waterproofing membrane 5, etc. can be selected. Since the aging resistance and fatigue resistance of the SBS modified asphalt waterproofing membrane 5 can meet the requirements of building construction, it has been widely used in the field of building design, and the cost is relatively low and there are finished products available for direct purchase in the market. In a preferred embodiment, the modified asphalt waterproofing membrane 5 is selected as the SBS modified asphalt waterproofing membrane, and its thickness is generally 4 mm.

[0066] The invention patent with the application number CN201822253102.0 discloses a building vibration isolation bearing. The spring used in this solution is prone to resonance at a certain vibration frequency, causing the vibration isolator to fail and thus unable to achieve the vibration damping effect. To avoid resonance, in a preferred embodiment, three non-connected stress plates 307 are also embedded in the elastic rubber 305. The stress plates 307 are respectively fixed on the circumferential surface of the spring 306, and the cross-sections of the three stress plates 307 coincide with the equilateral triangle sharing the side. By fixing three stress plates 307 on the circumferential surface of the spring 306 to form the rubber-rigid ring structure 12, while exerting the medium and high frequency vibration damping ability of the elastic rubber 305, expanding the vibration reduction frequency band and effectively alleviating resonance, the compression resistance of this structure can be enhanced, enabling the low-frequency vibration it receives to act evenly on the spring 306. Thus, by fully exerting the low-frequency vibration damping ability of the rubber-rigid ring structure 12, the low-frequency vibration damping ability of the vibration damping floating structure of the present invention can be improved.

[0067] It should be noted that the soil body 7 structure referred to in the present invention also refers to a concrete foundation equivalent to the soil body 7 structure. The size of each vibration damping bottom plate 3 needs to be determined according to the bottom surface area of the subway superstructure building 6 at the location where the vibration damping floating structure is used in the soil body 7 structure and the number of vibration damping bottom plates 3 designed accordingly. The thickness should be set according to the determined material strength grade, and the material strength grade needs to be determined through finite cloud computing based on parameters such as the gravity of the subway superstructure building 6 and the building design safety requirements, and determined through on-site or laboratory experiments. Generally, it should be ensured that the elastic rubber 305 structure in the actual use state bears more than 40% of the gravity of the subway superstructure building 6. To this end, in a preferred embodiment, the upper bearing plate 301 and the lower bearing plate 302 are high-strength low-alloy structural steels with a strength of Q345 - Q420 or above grade C; the arc plate 303 is a high-strength low-alloy structural steel with a strength of Q650 or above grade C; the spring 306 is a high-strength low-alloy structural steel with a strength of Q500 or above grade C; the elastic rubber 305 is a polyurethane rubber with a Shore hardness of above 85A; the stress-bearing plate 307 is a high-strength low-alloy structural steel with a strength of Q345 - Q420 or above grade C.

[0068] As an example, in this embodiment, the size of the vibration damping bottom plate 3 is 3700mm × 3700mm × 300mm. Among them, both the upper bearing plate 301 and the lower bearing plate 302 are Q390 or grade B low-alloy steel plates of 3700mm × 3700mm × 100mm; the arc plate 303 is a semi-circular plate with an inner diameter of 200mm, an outer diameter of 230mm, and a thickness of 30mm, and the material grade is Q650 or grade A low-alloy steel; the elastic rubber 305 is a polyurethane rubber with a Shore hardness of 85A, and the single-piece length is 300mm; the spring 306 is a low-alloy structural steel with a radius of 22mm and a strength of Q500 or above grade C; the stress-bearing plate 307 is a Q345 or grade C low-alloy steel of 40mm × 6mm; during factory prefabrication, the arc plate 303 is welded and fixed between the upper bearing plate 301 and the lower bearing plate 302, that is, the through hole 304 is formed, and the three stress-bearing plates 307 are welded and fixed on the circumferential surface of the spring 306 and then put into a prefabricated mold, and then hot-melt elastic rubber is poured into the mold. After it condenses and forms, it is the rubber-rigid ring structure 12. By applying prestress, 9 rubber-rigid ring structures 12 are sequentially pushed into each through hole 304, and the distance between every two rubber-rigid ring structures 12 is equal, all being 100mm, as Figure 4 shown.

[0069] For the above-mentioned vibration damping floating structure of a subway superstructure building, Embodiment Two and Embodiment Three of the present invention respectively provide construction methods for existing buildings and newly built buildings.

[0070] Embodiment Two is a construction method for existing buildings, as Figure 5 shown, including:

[0071] Step 1: Excavate the soil within the first preset width around the outer wall of the over-track building 6 downward to a preset depth below the bottom floor slab of the building to form a construction space; the above-mentioned first preset width and preset depth are set according to the needs of the construction space. Usually, the first preset width is about 3 - 5 m, and the preset depth is 1 m.

[0072] Step 2: Excavate the soil 7 directly below the bottom floor slab of the building from the above-mentioned preset depth in the second preset width from one end to the other end to form a first channel.

[0073] Step 3: In the construction space opposite to the above-mentioned first channel, a first track 8 is supported by a support member. Multiple vibration damping floor slabs 3 are spliced on the first track 8 to form a first floor slab. A modified asphalt waterproof coiled material 5 is installed on the upper surface of the first floor slab, and then the first track 8 and the first floor slab are pushed to the first end of the first channel together.

[0074] Step 4: In the construction space opposite to the first channel, a second track 9 is supported by a support member. Multiple vibration damping floor slabs 3 are spliced on the second track 9 to form a second floor slab. A modified asphalt waterproof coiled material 5 is installed on the upper surface of the second floor slab, and then the second track 9 and the above-mentioned second floor slab are pushed into the first channel and correspondingly docked with the first track 8 and the first floor slab.

[0075] Manufacture the third track 10 and the third floor slab according to the above method and complete the docking corresponding to the second track 9 and the second floor slab,... and so on, until the Nth floor slab reaches the second end of the first channel.

[0076] Step 5: Press-fill cement mortar 11 under each vibration damping floor slab 3 in the above-mentioned first channel to jack up each vibration damping floor slab 3 until the modified asphalt waterproof coiled material 5 on its upper surface is closely attached to the lower surface of the bottom floor slab of the building, and wait for the filled cement mortar 11 to solidify. Its completed state is as Figure 6 shown;

[0077] Step 6: Adjacent to the above-mentioned first channel, excavate from the preset depth in the second preset width from one end to the other end of the soil 7 directly below the bottom floor slab of the building to form a second channel, and arrange multiple vibration damping floor slabs 3 extending from its first end to the second end in the second channel in the same way as in Steps 3 and 4.

[0078] Closely attach the modified asphalt waterproof coiled material 5 on the upper surface of each vibration damping floor slab 3 in the above-mentioned second channel to the lower surface of the bottom floor slab of the building in the same way as in Step 5, and wait for the filled cement mortar 11 to solidify.

[0079] Step 7: A third channel is formed adjacent to the second channel in the same manner as in step 6, and a vibration-damping base plate 3 is provided in the third channel from the first end to the second end in the same manner as in step 6; ... and so on, until the soil 7 within a preset depth directly below the bottom floor of the building is completely replaced, forming a vibration-damping technical base plate 4;

[0080] Step 8: Fill the side walls of the vibration reduction technical base plate 4 with a third preset width of hot-mixed road-grade compacted asphalt. Specifically, a high-styrene-content C-type star-shaped SBS modified asphalt can be used, and the upper surface of the filled road-grade compacted asphalt is flush with the upper surface of the vibration reduction technical base plate 4. After the road-grade compacted asphalt is cooled and solidified, the first filling plate 1 is formed;

[0081] Step 9: Fill the construction space directly above the first filling plate 1 with a mixture of polyurethane and recycled coarse aggregate that is fully mixed by hot mixing, let it stand until the filled mixture hardens, then inject cement mortar 11, and then wait for it to cool, so as to form the second filling plate 2;

[0082] Specifically, the polyurethane and the recycled coarse aggregate can be hot-mixed by a mixer, and then filled while maintaining the temperature. Experiments have shown that the second filling plate 2 formed by this method has a load capacity close to that of load-bearing concrete, and exhibits a damping ratio of 10% under flexural vibration in the range of 10 Hz-200 Hz, which can effectively block low-frequency vibrations in the soil 7.

[0083] Step 10: Backfill the remaining gaps in the above construction space.

[0084] Specifically, combined with the size of the vibration-damping base plate 3 in Example 1, the first channel, the second channel and subsequent channels in this embodiment have a size of 4000 mm in width × 500 mm in height; the first track 8, the second track 9 and subsequent tracks are made of Q345 or C-grade low-alloy rails or steel plates, and the support members can be a group of steel supports or steel meshes to facilitate the subsequent filling of cement mortar 11.

[0085] It should be noted that, in order to improve construction efficiency, after the vibration reduction base plates 3 of 3 to 5 channels are laid, cement mortar 11 may be filled into these 3 to 5 channels under uniform pressure, but attention should be paid to ensuring the safe support of the remaining soil 7 structure to the existing building.

[0086] In a preferred embodiment, in step 8, after the asphalt is compacted at the filling road level, it is fully pounded to remove air from the asphalt, so that the asphalt aggregate tends to a stable state, and then left to stand to cool and solidify.

[0087] In another preferred embodiment, in step 9, when filling the mixture, the mixture is hammered until it no longer sinks, and then left to harden, so as to increase the packing density of the second filling plate 2 as much as possible.

[0088] Embodiment 3 is a construction method for a new building, such as Figure 7 As shown, including:

[0089] Step 1: After the concrete foundation of the subway superstructure 6 is constructed at a preset buried depth, a vibration-damping base plate 3 is laid on the upper surface of the concrete foundation along mutually perpendicular X and Y directions, and adjacent vibration-damping base plates 3 are spliced by modified asphalt waterproofing membranes 5 to form a vibration-damping technical base plate 4. A modified asphalt waterproofing membrane 5 is arranged on the upper surface of the vibration-damping technical base plate 4, and then the building is constructed upwards on the modified asphalt waterproofing membrane 5 on the upper surface of the vibration-damping technical base plate 4;

[0090] Step 2: Fill the side walls of the vibration reduction technical base plate 4 with hot-mixed road-grade compacted asphalt of a third preset width, and make the upper surface of the filled road-grade compacted asphalt flush with the upper surface of the vibration reduction technical base plate 4, and wait for the road-grade compacted asphalt to cool and solidify, thereby forming the first filling plate 1;

[0091] Step 3: Fill the space at a preset burial depth directly above the first filling plate 1 with a mixture of polyurethane and recycled coarse aggregate that is fully mixed by hot mixing. After the mixture is allowed to stand and harden, cement mortar 11 is injected and then allowed to cool to form the second filling plate 2.

[0092] Similarly, in a preferred embodiment, in step 2, after filling the road-grade compacted asphalt, it is fully hammered to remove the air in the asphalt and make the asphalt aggregate tend to a stable state, and then it is left to cool and solidify; in step 3, when filling the above mixture, the mixture is hammered until it no longer sinks, and then it is left to harden, so as to maximize the packing density of the second filling plate 2.

[0093] The above construction operation is simple, has strong feasibility and practicality, and has a wide range of applications.

[0094] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration isolation floating structure for a building constructed above a subway, characterized in that: It includes a first filling plate, a second filling plate, and a vibration damping technical floor formed by splicing a plurality of vibration damping bottom plates with a modified asphalt waterproof coiled material; The first filling plates are horizontally arranged at the side walls of the vibration damping technical floor, the second filling plates are vertically arranged directly above the first filling plates, and the bottom of the second filling plates is connected to the first filling plates; The upper surface of the vibration damping technical floor is used to be connected to the bottom surface of the subway superstructure located in the soil structure through a modified asphalt waterproof coiled material; the inner sides of the second filling plates are used to be connected to the outer sides of the outer walls of the subway superstructure located in the soil structure, and their outer sides are used to be connected to the soil structure; Among them, the material of the first filling plate is road-level compacted asphalt, and the second filling plate is formed by fully mixing recycled coarse aggregate wrapped with polyurethane and cement mortar; The vibration damping bottom plate includes an upper bearing plate and a lower bearing plate arranged parallel to each other from top to bottom, and a plurality of mutually parallel triangular structural units are sequentially arranged from one end to the other end between the upper bearing plate and the lower bearing plate; The triangular structural unit includes two arc-shaped plates that are concave downward and arranged back to back. The upper ends of the arc-shaped plates are connected to the upper bearing plate, and the lower ends are connected to the lower bearing plate, so that a through hole is formed between the two arc-shaped plates. A plurality of elastic rubbers are filled at intervals from one end to the other end in the through hole, and a spring extending from one end to the other end is embedded in the elastic rubber.

2. The vibration isolation floating structure of a building built on top of a subway according to claim 1, characterized in that: Three non-connected stress plates are also embedded in the elastic rubber. The stress plates are respectively fixed on the peripheral surface of the spring, so that the cross-sections of the three stress plates coincide with an equilateral triangle sharing a side.

3. The vibration isolation floating structure of a building built on top of a subway according to claim 1, characterized in that: The upper bearing plate and the lower bearing plate are high-strength low-alloy structural steels with a strength of Q345 - Q420 or above grade C; The arc-shaped plate is a high-strength low-alloy structural steel with a strength of Q650 or above grade C; The spring is a high-strength low-alloy structural steel with a strength of Q500 or above grade C; The elastic rubber is a polyurethane rubber with a Shore hardness of above 85A.

4. The vibration isolation floating structure of a building on top of a subway according to claim 1, wherein: The modified asphalt waterproof coiled material is an SBS modified asphalt waterproof coiled material.

5. A vibration isolation floating structure for a building above a subway, according to claim 1, characterized in that: The distance between every two elastic rubbers is equal.

6. The vibration isolation floating structure of a building above a subway according to claim 2, characterized in that: The stress plate is a high-strength low-alloy structural steel with a strength of Q345 - Q420 or above grade C.

7. A construction method of a vibration isolation floating structure for a building on top of a subway as described in any one of claims 1 to 6, wherein the building on top of the subway is an existing building, characterized in that, It includes: Step 1: Excavate the soil within a first preset width around the outer wall of the subway superstructure downward to a preset depth below the bottom floor slab of the building to form a construction space; Step 2: Excavate the soil directly below the bottom floor slab of the building from the preset depth in a second preset width from one end to the other end to form a first channel; Step 3: In the construction space opposite to the first channel, a first track is supported by a support member. A plurality of vibration damping bottom plates are spliced on the first track to form a first bottom plate. A modified asphalt waterproof coiled material is installed on the upper surface of the first bottom plate, and then the first track and the first bottom plate are pushed to the first end of the first channel together; Step 4: In the construction space directly opposite to the first channel, a second track is supported by a support member, a plurality of vibration-damping bottom plates are spliced on the second track to form a second bottom plate, a modified asphalt waterproofing membrane is installed on the upper surface of the second bottom plate, and then the second track and the second bottom plate are pushed into the first channel together and docked with the first track and the first bottom plate accordingly; According to the above method, the third rail and the third bottom plate are manufactured, and the corresponding docking with the second rail and the second bottom plate is completed, ... and this is repeated until the Nth bottom plate reaches the second end of the first channel; Step 5: Fill cement mortar under pressure under each vibration-damping base plate in the first channel, so that each vibration-damping base plate is lifted up until the modified asphalt waterproofing membrane on its upper surface is tightly attached to the lower surface of the bottom floor of the building, and wait for the filled cement mortar to solidify; Step 6: adjacent to the first channel, excavate from one end of the soil directly below the bottom floor of the building to the other end from the preset depth according to a second preset width to form a second channel, and arrange a plurality of vibration-damping bottom plates extending from the first end to the second end in the second channel in the same manner as steps 3 and 4; Using the same method as step 5, the modified asphalt waterproofing membrane on the upper surface of each of the vibration-damping bottom plates in the second channel is tightly attached to the lower surface of the bottom floor of the building, and the filled cement mortar is solidified; Step 7: Construct a third channel adjacent to the second channel in the same manner as in step 6, and provide a vibration-damping bottom plate in the third channel from the first end to the second end in the same manner as in step 6; ...repeat this process until the soil within the preset depth directly below the bottom floor of the building is completely replaced, forming a vibration-damping technical bottom plate; Step 8: Filling the side walls of the vibration reduction technical base plate with hot-mixed road-grade compacted asphalt of a third preset width, and making the upper surface of the filled road-grade compacted asphalt flush with the upper surface of the vibration reduction technical base plate, and leaving the road-grade compacted asphalt to cool and solidify, thereby forming a first filling plate; Step 9: Fill the construction space directly above the first filling plate with a mixture of polyurethane and recycled coarse aggregate that is fully mixed by hot mixing, let the mixture stand until it hardens, then inject cement mortar, and then wait for it to cool, thus forming a second filling plate; Step 10: Backfill the remaining gaps in the construction space.

8. The construction method of a vibration isolation floating structure for a building on top of a subway as described in any one of claims 1 to 6 according to claim 7, characterized in that, The method also includes: in step 8, after the asphalt is compacted at the filling road level, it is fully hammered and then left to stand to cool and solidify.

9. The construction method of a vibration isolation floating structure for a subway superstructure as described in any one of claims 1 to 6 according to claim 7, characterized in that, It also includes: in step 9, when filling the mixture, the mixture is hammered until it no longer sinks, and then left to stand to harden.

10. A construction method of a vibration reduction floating structure for a building above a subway as described in any one of claims 1 to 6, wherein the building above the subway is a newly built building, characterized in that, include: Step 1: After the concrete foundation construction at the preset buried depth of the subway superstructure building is completed, vibration damping bottom plates are laid on the upper surface of the concrete foundation along the mutually perpendicular X direction and Y direction respectively, and adjacent vibration damping bottom plates are spliced by modified asphalt waterproof coiled materials, thereby forming the vibration damping technical bottom plate. A modified asphalt waterproof coiled material is arranged on the upper surface of the vibration damping technical bottom plate, and then a building body is constructed upward on the modified asphalt waterproof coiled material on the upper surface of the vibration damping technical bottom plate; Step 2: Road-grade compacted asphalt after hot mixing is filled at the side walls of the vibration damping technical bottom plate with a third preset width, and the upper surface of the filled road-grade compacted asphalt is flush with the upper surface of the vibration damping technical bottom plate. After standing until the road-grade compacted asphalt cools and solidifies, the first filling plate is formed; Step 3: In the space at the preset buried depth directly above the first filling plate, a mixture obtained by fully mixing polyurethane and recycled coarse aggregate through hot mixing is filled. After standing until the filled mixture hardens, cement mortar is injected, and then after it cools, the second filling plate is formed.

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