Roadbed and pavement structure of tire combined package stack and construction method

Abstract

The invention relates to the technical field of road construction, and discloses a roadbed and pavement structure of a tire combined package stack and a construction method, the roadbed and pavement structure comprises a vertical drainage layer, a transverse water guide layer and a surface water seepage layer which are sequentially arranged in a foundation pit from bottom to top; the vertical drainage layer comprises a gravel layer and is laid at the bottom of the foundation pit to form a main drainage channel. The transverse water guide layer comprises a tire base layer which is laid above the gravel layer, a plurality of tire combined pack stacks are laid in the tire base layer, gravel is filled among the plurality of tire combined pack stacks, and the tire base layer forms a transverse water guide channel and is communicated with the main drainage channel; the surface permeable layer comprises a coarse sand leveling layer and permeable geotextile, the permeable geotextile is laid on the tire base layer, the coarse sand leveling layer is laid on the permeable geotextile, and a road surface is laid on the coarse sand leveling layer; and the isolation layers are arranged on the two sides of the foundation pit and used for isolating vegetation. Organic integration of water drainage, water prevention and vegetation invasion prevention is achieved, and the method is suitable for the long-term stable protection requirement of the waste tire base layer.

Description

Technical Field

[0001] The invention relates to the technical field of road construction, and in particular to a roadbed and pavement structure of tire assembly stacking and a construction method. Background Art

[0002] The rapid development of the automobile industry has led to a surge in waste tires, which has become a major resource and environmental challenge. Private cars and heavy trucks will account for 78% of future tire waste, and large-scale engineering applications are seen as a key solution to pollution. Waste tires are used as auxiliary materials in civil engineering due to their lightweight, shock-absorbing, and noise-reducing properties, with the main directions including rubber-modified asphalt and tire-derived aggregates. However, the current recycling rate is still low, and most of them still need to be landfilled.

[0003] In order to deal with waste tire pollution, low-processing direct utilization mode (such as whole tire landfill, tire baling) has become an emerging direction due to its low resource consumption and compliance with the concept of circular economy. Compared with traditional crushing and recycling, its advantages include: environmental friendliness - whole tires are almost pollution-free when interacting with the natural environment; high cost-effectiveness - reducing crushing processes, reducing energy consumption and costs.

[0004] In the past, it was mostly used in structures such as retaining walls and foundations. However, with the shortage of urban land, highway base construction has become a new scenario for large-scale application of whole tires due to its long mileage, large landfill space and the need for vegetation isolation.

[0005] Therefore, there is an urgent need for a roadbed and pavement structure and a construction method for a tire combination stack to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a roadbed and pavement structure of tire assembly stacking and a construction method to solve the problems existing in the above-mentioned prior art.

[0007] To achieve the above object, the present invention provides the following solution: The present invention provides a roadbed and pavement structure of a tire assembly stack, comprising:

[0008] The vertical drainage layer, the horizontal water-conducting layer and the surface water-seepage layer are arranged in sequence in the foundation pit from bottom to top;

[0009] The vertical drainage layer includes a crushed stone layer, which is laid at the bottom of the foundation pit to form a main drainage channel;

[0010] The transverse water-conducting layer comprises a tire base layer, which is laid on the gravel layer, a plurality of tire assembly packages are laid in the tire base layer, gravel is filled between the plurality of tire assembly packages, and the tire base layer forms a transverse water-conducting channel and is connected to the main drainage channel;

[0011] The surface water seepage layer includes a coarse sand leveling layer and a permeable geotextile, the permeable geotextile is laid on the tire base layer, the coarse sand leveling layer is laid on the permeable geotextile, and a road surface is laid on the coarse sand leveling layer;

[0012] An isolation layer is arranged on both sides of the foundation pit, and the isolation layer is used to isolate vegetation.

[0013] Preferably, the isolation layer includes an impermeable membrane and a bentonite waterproof blanket, the bentonite waterproof blanket is arranged on the side wall of the foundation pit, and the impermeable membrane is arranged on a side of the bentonite waterproof blanket away from the side wall of the foundation pit.

[0014] Preferably, it further comprises an intercepting ditch, wherein the intercepting ditch is located at both sides of the foundation pit, the inner lining of the intercepting ditch is a permeable concrete layer, and pebbles are laid in the intercepting ditch.

[0015] Preferably, a plurality of water-conducting ribs are provided in the tire base layer.

[0016] Preferably, the tire assembly stack comprises a plurality of tire segments, and the plurality of tire segments are spliced ​​into a plum blossom-shaped structure, and the plum blossom-shaped structure is filled with fillers.

[0017] Preferably, the filler includes three layers of crushed stone fillers and sulphoaluminate cement, the particles with a particle size of >20mm in the lower layer filler account for 40-50%, the particles with a particle size of >20mm in the middle layer filler account for 30-40%, the particles with a particle size of >20mm in the upper layer filler account for 20-30%, and the sulphoaluminate cement accounts for 3%.

[0018] Preferably, it also includes a stress diffuser, which is connected to the top of the tire segment by bolts. The stress diffuser is a conical structure with a cone angle of θ=60±5°. The material of the stress diffuser is a polyurethane-steel fiber composite material with an elastic modulus of 5-8Gpa.

[0019] A construction method for a roadbed and pavement structure of a tire assembly stack comprises the following steps:

[0020] preparing the tire assembly stack;

[0021] Arranging an isolation layer on the side wall of the foundation pit;

[0022] Filling a vertical drainage layer at the bottom of the foundation pit;

[0023] Fill the horizontal water-conducting layer on the vertical drainage layer;

[0024] A surface water seepage layer is laid on the lateral water conducting layer.

[0025] Preferably, when preparing the tire assembly stack, the waste tire is first cut into three arc units, the length of the arc unit is 1 / 3 of the tire circumference, six arc units are selected to connect into a plum blossom structure, and filler is filled and compacted;

[0026] According to the quincunx topology rule, the center distance L of adjacent units satisfies L=25D±0.1D, D is the tire diameter, and the ratio of the tire hoop modulus to the filler elastic modulus is 6.

[0027] Preferably, a three-stage compaction process is implemented, in which 80-00kN static pressure is applied in the first stage to form an initial skeleton, 50-200kN vibration compaction is used in the second stage to improve the density, and 50kN static pressure is used in the final stage to eliminate residual stress.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects:

[0029] The present invention provides a roadbed and pavement structure and construction method of a tire combination stack, wherein an isolation layer is arranged on the inner wall of a foundation pit to isolate vegetation, and a vertical drainage layer, a horizontal water-conducting layer and a surface water-seepage layer are laid layer by layer in the foundation pit, and tires are used for base layer laying. Through the structure-material-ecology triple protection system, the organic integration of drainage, waterproofing and prevention of vegetation invasion is achieved, and the method is suitable for the long-term stable protection needs of the waste tire base layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 A schematic diagram of the tire cutting position of the present invention;

[0033] Figure 3 It is a schematic diagram of the plum blossom structure of the present invention;

[0034] Figure 4 This is a cross-sectional view of the plum blossom-shaped structure of the present invention;

[0035] Figure 5 This is an example of a road composite body based on a road plum blossom tire;

[0036] Among them, 1. Road surface; 2. Coarse sand leveling layer; 3. Permeable geotextile; 4. Tire base layer; 5. Gravel layer; 6. Water-conducting ribs. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the 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.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Reference Figure 1-Figure 5 The present invention provides a roadbed and pavement structure of a tire assembly stack, comprising:

[0040] The vertical drainage layer, the horizontal water-conducting layer and the surface water-seepage layer are arranged in sequence in the foundation pit from bottom to top;

[0041] The vertical drainage layer includes a crushed stone layer 5, which is laid at the bottom of the foundation pit to form a main drainage channel;

[0042] The transverse water-conducting layer includes a tire base layer 4, which is laid on the gravel layer 5. A plurality of tire assembly stacks are laid in the tire base layer 4, and gravels are filled between the plurality of tire assembly stacks. The tire base layer 4 forms a transverse water-conducting channel and is connected to the main drainage channel.

[0043] The surface water seepage layer includes a coarse sand leveling layer 2 and a permeable geotextile 3. The permeable geotextile 3 is laid on the tire base layer 4. The coarse sand leveling layer 2 is laid on the permeable geotextile 3. The road surface 1 is laid on the coarse sand leveling layer 2.

[0044] The isolation layer is set on both sides of the foundation pit and is used to isolate the vegetation.

[0045] In one embodiment of the present invention, an isolation layer is provided on the inner wall of the foundation pit to isolate vegetation, and a vertical drainage layer, a horizontal water-conducting layer and a surface water-seepage layer are laid layer by layer in the foundation pit. At the same time, tires are used for base layer laying. Through the triple protection system of structure-material-ecology, an organic integration of drainage, waterproofing and prevention of vegetation invasion is achieved, which is suitable for the long-term stable protection needs of the waste tire base layer.

[0046] As an optional implementation, the isolation layer includes an impermeable membrane and a bentonite waterproof blanket, the bentonite waterproof blanket is arranged on the side wall of the foundation pit, and the impermeable membrane is arranged on a side of the bentonite waterproof blanket away from the side wall of the foundation pit.

[0047] In one embodiment of the present invention, a 2.0 mm thick HDPE anti-seepage membrane is laid on the side wall of the base layer, with a permeability coefficient of ≤1×10-13 cm / s, an overlap width of ≥15 cm, double weld hot-melt welding, and an air pressure detection of ≥0.2 MPa. A 5 cm thick bentonite waterproof blanket is set on the outside of the membrane, with a water expansion rate of ≥300% to compensate for potential leakage in the seams.

[0048] As an optional implementation, it also includes an intercepting ditch, which is located on both sides of the foundation pit. The inner lining of the intercepting ditch is a permeable concrete layer, and pebbles are laid in the intercepting ditch.

[0049] In one embodiment of the present invention, a 30cm×30cm trapezoidal intercepting ditch is excavated along the edge of the base layer, lined with permeable concrete with a thickness of 10cm, a ditch bottom slope of ≥1%, the ditch is filled with pebbles with a particle size of 40-60mm, a porosity of ≥40%, and a permeable geotextile is covered on the top to prevent siltation. A rubber waterstop with a width of 30cm is set every 20m and embedded between the impermeable membrane and the base layer, allowing ±5mm displacement and deformation. When the drainage pipe passes through the impermeable membrane, a stainless steel clamp + a water-expandable rubber ring is used for double sealing, and the water pressure resistance is ≥0.3MPa.

[0050] As an optional implementation, a plurality of water-conducting ribs 6 are arranged in the tire base layer 4 .

[0051] In one embodiment of the present invention, a water-conducting rib 6 is provided every three tire units, with a width of 20 cm, a thickness of 10 cm and a permeable concrete with a strength of C1.

[0052] As an optional implementation, the tire assembly stack includes a plurality of tire segments, the plurality of tire segments are spliced ​​into a plum blossom-shaped structure, and the plum blossom-shaped structure is filled with fillers.

[0053] In one embodiment of the present invention, waste tires are cut into three arc-shaped units, and the six cut segments are arranged into a plum blossom structure. Fillers are injected, compacted, and laid on the surface layer structure to form a load structure.

[0054] As an optional embodiment, the filler includes three layers of crushed stone fillers and sulphoaluminate cement, namely, upper, middle and lower layers. The particles with a particle size of >20 mm account for 40-50% of the lower layer filler, the particles with a particle size of >20 mm account for 30-40% of the middle layer filler, the particles with a particle size of >20 mm account for 20-30% of the upper layer filler, and the sulphoaluminate cement accounts for 3%.

[0055] In one embodiment of the present invention, a three-graded crushed stone of "coarse-medium-fine" is used with 3% sulphoaluminate cement to take both strength and water permeability into consideration. In the lower layer filler, particles with a particle size of >20 mm account for 40-50%, the middle layer is adjusted to 30-40%, and the upper layer is controlled to 20-30%, forming a progressive shear-resistant structure from bottom to top.

[0056] As an optional embodiment, it also includes a stress diffuser, which is connected to the top of the tire segment by bolts. The stress diffuser is a conical structure with a cone angle of θ=60±5°. The material of the stress diffuser is a polyurethane-steel fiber composite material with an elastic modulus of 5-8Gpa.

[0057] In one embodiment of the present invention, a conical stress diffuser is embedded on the top of the tire unit, with a cone angle of θ=60±5°, made of polyurethane-steel fiber composite material, and an elastic modulus of 5-8GPa. The top is a flat contact area, and the bottom is fixed to the tire unit by mortise and tenon joints or bolts.

[0058] Polyurethane-steel fiber conical stress diffuser, modulus 5-8GPa, is used to achieve continuous transition of modulus between tire base and upper road surface. Built-in directional steel fiber, volume fraction 8-12%, forms anisotropic properties of radial compression enhancement and axial flexibility and energy dissipation.

[0059] A construction method for a roadbed and pavement structure of a tire assembly stack comprises the following steps:

[0060] Preparing tire assembly pallets;

[0061] An isolation layer is provided on the side wall of the foundation pit;

[0062] Fill the bottom of the foundation pit with a vertical drainage layer;

[0063] Fill the horizontal water-conducting layer on the vertical drainage layer;

[0064] A surface water seepage layer is laid on the lateral water conducting layer.

[0065] In one embodiment of the present invention, the vertical drainage layer:

[0066] A 30cm thick graded gravel layer with a particle size of 20-40mm and a permeability coefficient of ≥1×10-2cm / s is laid at the bottom of the tire base to form the main drainage channel.

[0067] Φ200mm HDPE perforated corrugated pipes are pre-buried in the gravel layer, with an opening rate of 15%, a longitudinal slope of ≥0.5%, and a grid arrangement of 5m×5m.

[0068] Horizontal water conducting layer:

[0069] The gaps between tire units are filled with 5-10mm gravel with a porosity of ≥35%, forming a continuous water conduction system with the vertical drainage layer.

[0070] A water-guiding rib with a width of 20 cm and a thickness of 10 cm is set every 3 tire units. It is made of permeable concrete with a strength of C15.

[0071] Surface water seepage layer:

[0072] The top layer is paved with permeable geotextile, 400g / m2+5cm thick coarse sand leveling layer, and the permeability coefficient is ≥5×10-3cm / s to prevent fine particles from clogging the lower drainage structure.

[0073] As an optional implementation, when preparing the tire assembly stack, first cut the waste tire into three arc units, the length of the arc unit is 1 / 3 of the tire circumference, select six arc units to connect into a plum blossom structure, fill with fillers and compact;

[0074] According to the quincunx topology rule, the center distance L of adjacent units satisfies L=25D±0.1D, D is the tire diameter, and the ratio of the tire hoop modulus to the filler elastic modulus is 6.

[0075] In one embodiment of the present invention, waste tires are cut into three arc-shaped units with a central angle of 120°, which are connected by high-strength bolts to form a honeycomb network; the ends of the arc-shaped units are connected by high-strength bolts + mortise and tenon structures to form semi-rigid nodes, which have both flexible buffering and rigid force transmission functions.

[0076] The parameters of the plum blossom arrangement were determined by discrete element simulation optimization: when the arrangement density parameter λ=πD2 / 4L2 is in the range of 0.65-0.75, the optimal stress diffusion effect can be produced, and FEM analysis shows that the stress concentration factor K is reduced from 2.3 to 1.4.

[0077] The topological arrangement of the hoop constraint body satisfies: the tire diameter D and the center distance L of the adjacent units satisfy L = 1.25D ± 0.1D, and the ratio of the tire hoop modulus to the filler elastic modulus is optimal at about 6.

[0078] As an optional implementation, a three-stage compaction process is implemented, in which 80-100kN static pressure is applied in the first stage to form the initial skeleton, 150-200kN vibration compaction is used in the second stage to increase the density, and 50kN static pressure is used in the final stage to eliminate residual stress.

[0079] In one embodiment of the present invention, the dual-frequency vibration compaction parameters are optimized by the response surface method to avoid the rubber from cracking due to high-frequency resonance fatigue. A three-stage compaction process is implemented using a dual-frequency vibration compaction device with a low frequency of 5-15Hz and a high frequency of 30-50Hz. In the first stage, 80-100kN static pressure is applied to form the initial skeleton, 150-200kN vibration compaction is used to improve the density in the second stage, and 50kN static pressure is used to eliminate residual stress in the final stage; interface enhancement treatment: an interface modifier containing a silane coupling agent is sprayed on the tire-filler interface, and the concentration is controlled at 0.3-0.5wt% to form a chemically bonded transition layer.

[0080] In one embodiment of the present invention, the lateral arrangement density is optimized, and the unit center distance L is:

[0081] According to the quincunx topology rule, the center distance between adjacent units satisfies L = 1.25D ± 0.1D, which needs to be adjusted in combination with the lane width:

[0082] n is the number of transverse arrangement units of a single lane (take an integer value)

[0083] δ is the edge safety distance (usually δ = 0.1D)

[0084] The number of lateral elements n satisfies:

[0085]

[0086] If n ≥ 3, the standard quincunx arrangement is used;

[0087] If n<3, adjust to a symmetrical double-row staggered arrangement.

[0088] Longitudinal row spacing and section adaptation:

[0089] Vertical row spacing Sy: The vertical row spacing of the plum blossom shape is 3 / 2 times the horizontal center distance:

[0090] Total number of rows m: According to the total width of the section BB, the effective width after deducting the shoulder and the dividing strip is Beff = B-2S-C.

[0091] Edge densification correction, shoulder and median area:

[0092] The center distance of the edge 1-2 row units is reduced to L′=0.9L, improving the ability to resist lateral displacement.

[0093] The filling rate of the encrypted area λedge=λ+0.1λ, where λ is the arrangement density of the normal area.

[0094] Mechanical properties constraint equation:

[0095] Stress Diffusion Constraints:

[0096] Quincunx arrangement density parameters Need to meet:

[0097]

[0098] Combined with lane width W correction:

[0099]

[0100] Differential Settlement Control:

[0101] Based on the elastic layer theory, the differential sedimentation coefficient Δ must satisfy:

[0102]

[0103] Where si is the settlement of each node, and L and Sy are calculated iteratively through the finite element model.

[0104] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0105] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A roadbed and pavement structure of tire assembly stacking, characterized in that: include: The vertical drainage layer, the horizontal water-conducting layer and the surface water-seepage layer are arranged in sequence in the foundation pit from bottom to top; The vertical drainage layer comprises a crushed stone layer (5), which is laid at the bottom of the foundation pit to form a main drainage channel; The transverse water-conducting layer comprises a tire base layer (4) which is laid on top of the gravel layer (5), a plurality of tire assembly stacks are laid in the tire base layer (4), gravels are filled between the plurality of tire assembly stacks, and the tire base layer (4) forms a transverse water-conducting channel which is connected to the main drainage channel; The surface water seepage layer comprises a coarse sand leveling layer (2) and a permeable geotextile (3), the permeable geotextile (3) is laid on the tire base layer (4), the coarse sand leveling layer (2) is laid on the permeable geotextile (3), and the road surface (1) is laid on the coarse sand leveling layer (2); An isolation layer is arranged on both sides of the foundation pit, and the isolation layer is used to isolate vegetation.

2. The roadbed and pavement structure of tire assembly stacking according to claim 1, characterized in that: The isolation layer includes an impermeable membrane and a bentonite waterproof blanket. The bentonite waterproof blanket is arranged on the side wall of the foundation pit, and the impermeable membrane is arranged on a side of the bentonite waterproof blanket away from the side wall of the foundation pit.

3. The roadbed and pavement structure of tire assembly stacking according to claim 1, characterized in that: It also includes an intercepting ditch, which is located at both sides of the foundation pit. The inner lining of the intercepting ditch is a permeable concrete layer, and pebbles are laid in the intercepting ditch.

4. The roadbed and pavement structure of tire assembly stacking according to claim 1, characterized in that: A plurality of water-conducting ribs (6) are arranged in the tire base layer (4).

5. The roadbed and pavement structure of tire assembly stacking according to claim 1, characterized in that: The tire assembly stack comprises a plurality of tire segments, and the plurality of tire segments are spliced ​​into a plum blossom-shaped structure, and the plum blossom-shaped structure is filled with fillers.

6. The roadbed and pavement structure of tire assembly stacking according to claim 5, characterized in that: The filler includes three layers of crushed stone fillers and sulphoaluminate cement, wherein the particles with a particle size of >20 mm account for 40-50% of the lower layer filler, the particles with a particle size of >20 mm account for 30-40% of the middle layer filler, the particles with a particle size of >20 mm account for 20-30% of the upper layer filler, and the sulphoaluminate cement accounts for 3%.

7. The roadbed and pavement structure of tire assembly stacking according to claim 1, characterized in that: It also includes a stress diffuser, which is connected to the top of the tire segment by bolts. The stress diffuser is a conical structure with a cone angle of θ=60±5°. The material of the stress diffuser is a polyurethane-steel fiber composite material with an elastic modulus of 5-8Gpa.

8. A construction method for a roadbed and pavement structure of a tire assembly stack, applicable to the roadbed and pavement structure of a tire assembly stack as claimed in claim 1, characterized in that: The following steps are involved: preparing the tire assembly stack; Providing an isolation layer on the side wall of the foundation pit; Filling a vertical drainage layer at the bottom of the foundation pit; Fill the horizontal water-conducting layer on the vertical drainage layer; A surface water seepage layer is laid on the lateral water conducting layer.

9. The construction method of a roadbed and pavement structure of tire assembly stacking according to claim 8, characterized in that: When preparing the tire assembly stack, the waste tire is first cut into three arc units, the length of the arc unit is 1 / 3 of the tire circumference, six arc units are selected to connect into a plum blossom structure, and filler is filled and compacted; According to the quincunx topology rule, the center distance L of adjacent units satisfies L=1.25D±0.1D, D is the tire diameter, and the ratio of the tire hoop modulus to the filler elastic modulus is 6.

10. The construction method of a roadbed and pavement structure of tire assembly stacking according to claim 9, characterized in that: A three-stage compaction process is implemented. In the first stage, 80-100kN static pressure is applied to form the initial skeleton, in the second stage, 150-200kN vibration compaction is used to increase the density, and in the final stage, 50kN static pressure is used to eliminate residual stress.

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