A construction method for a solid waste lightweight soil rail transit vibration isolation structure

Abstract

The present invention belongs to the field of civil engineering, and specifically relates to a construction method for a solid waste lightweight soil rail transit vibration isolation structure. The steps are as follows: excavating a foundation trench according to a preset elevation, and sequentially carrying out measurement, positioning, laying out, mechanical crushing, excavation, and manual cleaning of the base; laying a crushed stone cushion layer in two layers on the base, and rolling and leveling it with a bulldozer; using solid waste lightweight soil for step-by-step pouring construction to form a multi-level solid waste lightweight soil roadbed; laying an antifreeze waterproof layer and a graded crushed stone layer on the top of the solid waste lightweight soil roadbed in sequence, constructing a pavement structure layer, and completing the construction of the solid waste lightweight soil roadbed; excavating a trapezoidal trench along the extension direction of the solid waste lightweight soil roadbed to the designed elevation, and laying a polyurethane vibration isolation pad on the inclined surface of the trench; hanging a joint pipe in the trench, and pouring solid waste lightweight soil in layers and zones; pulling out the joint pipe after the solid waste lightweight soil is finally solidified, and backfilling the pipe hole with solid waste lightweight soil to form a solid waste lightweight soil vibration isolation wall. The solid waste lightweight soil roadbed filler used in the present invention has the advantages of light weight, high strength, economy, environmental protection, and strong vibration isolation performance. It can significantly reduce the overlying load of the soil layer, thereby significantly reducing the roadbed settlement and track deformation, reducing the vibration intensity from the vibration source, and effectively preventing the vibration wave from transmitting downward; after the vibration wave is transmitted to the solid waste lightweight soil vibration isolation wall, it undergoes multiple reflection attenuation, reducing the vibration during the propagation process; the dual vibration reduction effect of the solid waste lightweight soil roadbed and the vibration isolation wall can significantly suppress the vibration response induced by rail transit.

Description

Technical Field

[0001] The present invention belongs to the field of civil engineering, and in particular relates to a construction method of a solid waste lightweight soil rail transit vibration isolation structure. Background Art

[0002] With the rapid development of urban construction and the improvement of transportation networks, the long-term effects of traffic loads can lead to roadbed instability, uneven settlement, cracking and deformation of pavement structures, and other problems. This can cause significant track irregularities and, in turn, lead to intense vibration. The body waves generated by these vibrations propagate in all directions while constantly reflecting and refracting, ultimately superimposing on the Earth's surface to form Rayleigh waves that propagate along the medium. The energy of these vibration waves can trigger secondary vibrations in buildings along the railway line, causing irreversible fatigue damage to the structures and impacting the daily lives and health of surrounding residents. Currently, environmental vibration pollution is becoming increasingly serious and has been listed as one of the seven major environmental hazards, requiring effective measures to limit it.

[0003] Currently, urban rail transit vibration isolation measures fall into three categories: reducing vibration at the source through measures such as damping tracks and improving track smoothness; installing vibration barriers such as isolation walls, piles, and wave blocks at a certain distance from the track to reduce vibration during propagation; and passive vibration isolation measures such as installing vibration isolation devices on buildings. Vibration-damping tracks and vibration isolation devices are difficult and expensive to construct, hindering widespread adoption. Conventional vibration isolation barriers also suffer from poor isolation effectiveness and generate large amounts of debris during construction, leading to serious environmental pollution.

[0004] Solid waste lightweight soil offers advantages such as light weight, high strength, economy, environmental friendliness, good fluidity, and strong vibration isolation. It can also significantly reduce excavated soil, thus avoiding environmental pollution. Replacing roadbed with lightweight soil effectively reduces overburden loads, minimizes track deformation, and mitigates vibration intensity at the source. The numerous closed voids within lightweight soil provide excellent vibration isolation and reduction properties. Vibration waves, after passing through the soil and reaching the lightweight soil isolation wall, are attenuated by multiple reflections, effectively reducing the impact of vibration. Summary of the Invention

[0005] The purpose of the present invention is to provide a construction method for a solid waste lightweight soil rail transit vibration isolation structure. In order to overcome the problems of poor vibration isolation effect and high cost of existing rail transit vibration isolation technology, and at the same time to effectively solve the problems of rail transit roadbed diseases and resource utilization of slag and industrial solid waste, a vibration isolation structure consisting of a solid waste lightweight soil roadbed and a vibration isolation wall is comprehensively proposed to effectively reduce the harm of vibration to surrounding buildings.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A construction method for a solid waste lightweight soil rail transit vibration isolation structure includes first constructing a solid waste lightweight soil roadbed, and then constructing a solid waste lightweight soil vibration isolation wall after the solid waste lightweight soil roadbed is completed. The specific steps are as follows:

[0008] S1. Excavate the foundation trench according to the preset elevation, and carry out measurement, positioning and layout, mechanical crushing, excavation and manual cleaning of the base in sequence;

[0009] S2. Lay a crushed stone cushion in two layers on the base and compact it with a bulldozer;

[0010] S3. Use solid waste lightweight soil to pour in a step-by-step manner to form a multi-level solid waste lightweight soil roadbed;

[0011] S4. After the completion of step S3, an antifreeze waterproof layer and a graded crushed stone layer are laid in sequence on top of the solid waste lightweight soil roadbed, and a pavement structure layer is constructed to complete the construction of the solid waste lightweight soil roadbed;

[0012] S5. Excavate a trapezoidal trench along the extension direction of the solid waste lightweight soil roadbed to the designed elevation, and lay polyurethane vibration isolation pads on the inclined surface of the trench;

[0013] S6. Hang the joint pipe in the trench and pour the solid waste lightweight soil in layers and zones;

[0014] S7. After the solid waste lightweight soil has finally solidified, pull out the joint pipe and backfill the pipe hole with solid waste lightweight soil to form a solid waste lightweight soil vibration isolation wall.

[0015] A 10cm to 20cm thick C30 concrete protective layer needs to be set on both sides of the solid waste lightweight soil roadbed, and the slope ratio of the protective layer is 1:1.5.

[0016] The geogrid is fixed with U-shaped nails and its tensile strength is greater than 25kN / m.

[0017] The antifreeze waterproof layer is used to wrap the roadbed filler, including the anti-seepage membrane and the non-woven geotextile wrapped with the anti-seepage membrane. The thickness of the antifreeze waterproof layer must be greater than 1 cm and the permeability coefficient must be less than 1×10 -11 cm / s.

[0018] The raw materials of solid waste lightweight soil include slag, curing agent, foaming agent, water and industrial waste, with a wet density of 600-1000kg / m 3 , the flow value is 180±20mm; the slag is the excavated slag that is crushed and passed through a 5mm sieve; the curing agent includes ordinary Portland cement, fly ash Portland cement, magnesium oxide and other gelling materials; the foaming agent includes protein foaming agent, polymer composite foaming agent, nano foaming agent, etc.; industrial waste includes fly ash, blast furnace slag, alkali slag, serpentine, carbide slag, etc.

[0019] The construction method of the solid waste lightweight soil rail transit vibration isolation structure comprises the following steps:

[0020] a. Place the pretreated soil, curing agent, industrial waste and water in a stirring device in proportion and stir evenly to form a slurry;

[0021] b. Pre-foaming is used to dilute the foaming agent with water at a ratio of 40 to 100 times to form a foaming liquid, and the foam is prepared using a foaming machine and the foaming liquid. The foam is evenly mixed with the slurry in step a to form a solid waste lightweight soil.

[0022] The solid waste lightweight soil roadbed is poured in layers, with each layer pouring height greater than 0.25m and less than 1m. The pouring interval between two adjacent layers should be no less than 12 hours. A deformation joint is set approximately 20m in the longitudinal direction, and the deformation joint is filled with 2cm to 4cm thick plywood.

[0023] The thickness of the graded gravel layer should be at least 50cm, and a layer of galvanized steel wire mesh should be laid on the top.

[0024] The solid waste lightweight soil vibration isolation wall is set in a trapezoidal shape. The specific position and the width of the top and bottom surfaces need to be determined according to the vibration intensity and the distance from the vibration source, but it should be at least 20m away from the center line of the track. The depth must be greater than 1 times the wavelength and at least 10m.

[0025] Solid waste lightweight soil vibration isolation walls should be cast in layers and zones, with each layer casting height greater than 0.5m and less than 1m.

[0026] The inclined angle of the solid waste lightweight soil vibration isolation wall is 30 to 45 degrees, and polyurethane vibration isolation pads need to be laid on the inclined surface.

[0027] The joint pipe can be used as a temporary supporting member and supporting formwork. The outside of the joint pipe needs to be coated with lubricating oil. It should be pulled out and recycled after the initial setting and before the final setting of the solid waste lightweight soil. The hole after pulling out needs to be backfilled with solid waste lightweight soil.

[0028] Beneficial effects

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] (1) The solid waste lightweight soil roadbed filler used in the present invention has the advantages of being lightweight, high-strength, economical, environmentally friendly, and having strong vibration isolation performance. It can significantly reduce the overlying load of the soil layer, thereby significantly reducing the roadbed settlement and track deformation, reducing the vibration intensity at the vibration source, and effectively preventing the vibration wave from transmitting downward.

[0031] (2) In order to further improve the vibration isolation effect, an isolation wall is set up between the vibration source and the building. The isolation wall uses porous and lightweight solid waste lightweight soil as the filling material, and polyurethane vibration isolation pads are laid on the side. After the vibration wave is transmitted to the solid waste lightweight soil isolation wall, it undergoes multiple reflection attenuation, reducing the vibration during the propagation process; the dual vibration reduction effect of the solid waste lightweight soil roadbed and the isolation wall can significantly suppress the vibration response induced by rail transit; at the same time, the isolation wall is set to a trapezoidal structure with a wide top and a narrow bottom according to the vibration intensity, which can effectively save the project cost.

[0032] (3) The present invention uses mud, slag and industrial solid waste generated by excavation to prepare lightweight soil, which can save costs and protect the environment. The closed gaps inside the lightweight soil can effectively reduce the impact of vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of a solid waste lightweight soil rail transit vibration isolation structure;

[0034] Figure 2 This is a top view of the solid waste lightweight soil rail transit vibration isolation structure;

[0035] Among them: 1- crushed stone cushion layer, 2- geogrid, 3- solid waste lightweight soil roadbed, 4- concrete surface layer, 5- antifreeze waterproof layer, 6- graded crushed stone layer, 7- pavement structure layer, 8- polyurethane vibration isolation pad, 9- solid waste lightweight soil, 10- solid waste lightweight soil vibration isolation wall, 11- building, 12- vibration source, 13- joint pipe. DETAILED DESCRIPTION

[0036] To make the purpose and technical solutions of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1 As shown, the solid waste lightweight soil rail transit vibration isolation structure includes a solid waste lightweight soil roadbed 3 and a solid waste lightweight soil vibration isolation wall 10 arranged between a vibration source 12 and a building 11. The specific implementation steps are as follows:

[0038] (1) Excavate the foundation pit according to the preset elevation according to the construction survey report, and then carry out measurement, positioning and layout, mechanical crushing, excavation and manual cleaning of the base.

[0039] (2) A crushed stone cushion layer 1 is laid on the base in two layers, each layer is 25 cm thick, and a geogrid 2 with a tensile strength of 25 kN / m fixed by U-shaped nails is laid between the two layers of crushed stone cushion layers. The crushed stone cushion layer is compacted and leveled with a bulldozer.

[0040] (3) Set up a solid waste lightweight soil preparation site about 200m away from the roadbed, and prepare on-site the wet density of 800kg / m 3 , solid waste lightweight soil with a flow value of 180mm: first, the excavated debris crushed through a 5mm sieve, silicate cement and blast furnace slag are mixed evenly in a stirring device at a mass ratio of 3:4:3, and then tap water is added at a water-solid ratio of 0.7 and stirred into a slurry; then the polymer composite foaming agent is diluted with water at a ratio of 1:100 to form a foaming liquid, and foam is prepared using a foaming machine and foaming liquid, and the foam is injected into the slurry and mixed evenly to form solid waste lightweight soil.

[0041] (4) Layered pouring of solid waste lightweight soil: a partition bin is set up every 20 m along the extension direction of the track using wooden boards, and a deformation joint is set in the middle of the partition bin. The deformation joint is filled with 2 cm thick wooden plywood. The solid waste lightweight soil is pumped into the partition bin, and each layer is poured 0.6 m, with an interval of 12 hours between each pouring. After the solid waste lightweight soil is finally solidified, geogrid is laid on the top. The operation is repeated until the roadbed pouring is completed.

[0042] (5) Lay the concrete surface layer 4 with a slope ratio of 1:1.5; lay the antifreeze waterproof layer 5 and the graded crushed stone layer 6 on the top of the roadbed in sequence, and construct the pavement structure layer 7; the graded crushed stone layer 6 is 50 cm thick, and a layer of galvanized steel wire mesh is laid on the top;

[0043] (6) At 30m from the centerline of the track, a trapezoidal trench with a depth of 10m is excavated along the extension direction of the railway. The top width of the trench is 2m and the bottom width is 1m. After removing the silt and residue at the bottom of the trench, a polyurethane vibration isolation pad 8 is laid on the inclined surface of the trench;

[0044] (7) Hang the joint pipe 13 in the trench and pour the solid waste lightweight soil 9 in layers, with each layer having a thickness of 0.8m.

[0045] (8) After the initial setting of the solid waste lightweight soil and before the final setting, the joint pipe 13 is pulled out, and the joint pipe hole is filled with lightweight soil to complete the construction of the vibration isolation wall.

[0046] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A construction method for a solid waste lightweight soil rail transit vibration isolation structure, characterized by: First, construct the solid waste lightweight soil roadbed. After the solid waste lightweight soil roadbed is completed, construct the solid waste lightweight soil vibration isolation wall. The specific steps are as follows: S1. Excavate the foundation trench according to the preset elevation, and carry out measurement, positioning and layout, mechanical crushing, excavation and manual cleaning of the base in sequence; S2, laying a crushed stone cushion layer (1) in two layers on the base, and rolling and leveling it with a bulldozer; S3, using solid waste lightweight soil to pour in a step-by-step manner to form a multi-level solid waste lightweight soil roadbed (3); S4, after the completion of step S3, an antifreeze waterproof layer (5) and a graded crushed stone layer (6) are sequentially laid on top of the solid waste lightweight soil roadbed (3), and a pavement structure layer (7) is constructed to complete the construction of the solid waste lightweight soil roadbed (3); S5, excavating a trapezoidal trench along the extension direction of the solid waste lightweight soil roadbed (3) to the designed elevation, and laying a polyurethane vibration isolation pad (8) on the inclined surface of the trench; S6, hanging the joint pipe (13) in the trench, and pouring the solid waste lightweight soil (9) in layers and zones; S7, after the solid waste lightweight soil (9) is finally solidified, the joint pipe is pulled out, and the pipe hole is backfilled with solid waste lightweight soil to form a solid waste lightweight soil vibration isolation wall (10); The solid waste lightweight soil is composed of slag soil, curing agent, foaming agent, water and industrial waste; The slag soil is excavated slag soil that has been crushed and passed through a 5mm sieve; The curing agent includes ordinary Portland cement, fly ash Portland cement, and magnesium oxide gelling material; The foaming agent includes protein foaming agent, polymer composite foaming agent and nano foaming agent; The industrial waste includes fly ash, blast furnace slag, alkali slag, serpentine, carbide slag, and steel slag.

2. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1 is characterized by: The wet density of the solid waste lightweight soil is 500~1000kg / m 3 , the flow value is 180±20mm.

3. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1 is characterized by: The preparation steps of solid waste lightweight soil are as follows: 1) Place the crushed and sieved slag, curing agent, industrial waste and water in a stirring device in proportion and stir evenly to form a slurry; 2) Using the pre-foaming method, dilute the foaming agent with water at a ratio of 40-100 times to form a foaming liquid, use a foaming machine to prepare foam, and mix the foam with the slurry in step 1) to form solid waste lightweight soil.

4. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1 is characterized by: In step S3, the solid waste lightweight earth road is constructed by step-by-step pouring. The pouring height of each layer is greater than 0.25m and less than 1m. The pouring interval between two adjacent layers should be no less than 12 hours. A deformation joint is set every 20m in the longitudinal direction, and the deformation joint is filled with 2cm thick plywood.

5. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 2 is characterized by: A concrete protective layer (4) is laid on the outside of the stepped solid waste lightweight soil roadbed. Drainage ditches are set every 30m along the track direction on the concrete protective layer (4). The slope ratio of the concrete protective layer (4) is 1:1.

5.

6. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1 is characterized by: In step S2, the crushed stone cushion layer (1) is laid in two layers, each layer having a thickness of 20 to 30 cm. A geogrid (2) is laid between the two layers of crushed stone cushion layers. The geogrid is fixed to the first layer of crushed stone cushion layer using U-shaped nails, and the tensile strength of the geogrid is greater than 25 kN / m.

7. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1 is characterized by: In step S7, the solid waste lightweight soil vibration isolation wall (10) is arranged in an inverted trapezoidal shape, and the solid waste lightweight soil vibration isolation wall (10) is set between the vibration source (12) and the building (11).

8. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1 is characterized by: The solid waste lightweight soil vibration isolation wall (10) is inclined on one side facing the solid waste lightweight soil roadbed (3) or on both sides facing the solid waste lightweight soil roadbed (3) and the building (11); the inclination is 30-45 degrees, and a polyurethane vibration isolation pad (8) is laid on the inclined surface.

9. The construction method of the solid waste lightweight soil rail transit vibration isolation structure according to claim 1, characterized in that: The construction steps for step-by-step pouring of solid waste lightweight soil in step S3 are as follows: First, a partitioned casting template is set on the cushion layer, a first layer of solid waste lightweight soil is poured in the template, and a geogrid is laid on the first layer of solid waste lightweight soil; Afterwards, a partitioned casting template is set on the first layer of solid waste lightweight soil, the second layer of solid waste lightweight soil is poured, and geogrids are laid on the second layer of solid waste lightweight soil, and the cycle is repeated until the design elevation is reached.

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