Transverse rib waste tire strip reinforced and widened roadbed and construction technical method

Abstract

The invention discloses a transverse rib waste tire strip reinforced and widened roadbed which comprises a buffer cushion layer, an existing roadbed, a widened roadbed and a plurality of layers of transverse rib waste tire strip reinforcement bodies arranged in a staggered mode. The buffer cushion layer is laid at the bottom of the widened roadbed; the two sides of the existing roadbed are processed into sawtooth-shaped connecting faces to be connected with the widened roadbed, and transverse rib waste tire strip reinforcing bodies are fully laid at the corresponding positions of the connecting faces and the widened roadbed according to the height of the existing roadbed. According to the invention, the shear resistance, compression resistance and tensile strength of the soil body are improved, the lateral displacement of the soil body is effectively limited, and the new and old roadbeds are firmly combined together to form a stable whole, so that the differential settlement of the new and old roadbeds is reduced, and the overall stability of the broadened roadbed is improved. Meanwhile, recycling of inherent resources is achieved, the ecological environment is improved, the greenhouse effect is reduced, the cost is lower, and wide application prospects are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of highway roadbed, and in particular to a roadbed widening reinforcement method with cross-rib waste tire strips and a construction technology method. Background Art

[0002] With the development of social economy and the gradual increase in traffic volume, the roads built in the early days can no longer meet people's traffic needs, and the problem of highway congestion is becoming increasingly serious. The main methods to solve the traffic congestion on saturated highways are to increase the traffic capacity of trunk lines by increasing the density of the road network, or to widen the lanes on one or both sides of the old road. However, the density of the road network requires a large amount of investment, so widening old roads to improve highway traffic capacity is an inevitable trend in the development of the transportation industry. Although widening old roads can effectively increase highway traffic capacity, the different stress environments of the new and old roadbeds will lead to uncoordinated deformation at the junction of the new and old roadbeds, and even cause road driving safety problems. How to effectively solve the problem of differential settlement of the widened roadbed needs to be solved urgently.

[0003] Waste tires are large and polluting, and are known as the "world's black pollution". Their stacking not only occupies land resources, but also has a limited amount of disposal. In addition, waste tires piled in the open air are prone to fire, causing serious air pollution. According to statistics, more than 15 million tons of waste tires are produced every year in the world. By 2030, the number of waste tires will increase at a rate of about 20% per year. How to deal with the huge number of waste tires has become an urgent and serious international social, economic and environmental issue.

[0004] The differential settlement of the new and old roadbeds and the lack of stability of the widened roadbed are the main causes of road widening defects. They are more significant under the action of earthquakes, traffic and other loads. At present, in the construction of highway reconstruction and expansion, the main methods used are layered filling of high-quality fillers, foundation treatment and laying of geosynthetics to control the differential settlement of the new and old roadbeds and improve the stability of the widened roadbed. Laying geosynthetics and utilizing the interaction between reinforcement and soil can effectively increase the shear strength of the soil, limit the lateral displacement and vertical settlement of the soil, reduce the differential settlement of the new and old roadbeds and improve the overall stability of the widened roadbed.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The purpose of the present invention is to provide a transverse rib tire strip reinforcement widening roadbed with significant effect and good durability, and the specific technical scheme is as follows: To solve the above technical problems, the technical solution provided by the present invention is as follows: A reinforced and widened subgrade with transverse ribbed waste tire strips, comprising: a buffer cushion layer, laid at the bottom of the widened subgrade, made of a new type of lightweight composite material, with a paving thickness of 25 cm; an existing subgrade, with both sides processed into serrated joint surfaces, the joint surfaces are provided with a slope of 3%-5% inward, the height of the joint surface is 60-120 cm, and the bottom width is 180 cm; a widened subgrade, connected to the existing subgrade through the serrated joint surface, and filled in sections; a multi-layer staggered arrangement of transverse ribbed waste tire strip reinforcement bodies, laid at the corresponding positions of the joint surface and the widened subgrade, arranged in a staggered manner along the road direction; the surface of the transverse ribbed waste tire strip reinforcement body is roughened, with a roughness reaching Ra80μm, and 5% of nano-silica particles are uniformly added into the strip body to enhance its interaction with the soil mass and its own mechanical properties.

[0007] Preferably, the buffer cushion layer is made of a new type of lightweight composite material, with a paving thickness of 25 cm, and its material has high compressive strength and good stress dispersion performance; the serrated joint surfaces on both sides of the existing subgrade are provided with a slope of 3%-5% inward, the height of the joint surface is 60-120 cm, and the bottom width is 180 cm, and the treatment of the joint surface, the filling of the widened subgrade and the laying of the transverse ribbed waste tire strip reinforcement body are carried out synchronously.

[0008] Preferably, the arrangement method of the transverse ribbed waste tire strip reinforcement body is as follows: for an existing subgrade with a height not exceeding 5 m, the transverse ribbed waste tire strip reinforcement body is laid in one layer at the bottom of the widened subgrade; for an existing subgrade with a height exceeding 5 m, the transverse ribbed waste tire strip reinforcement body is laid in one layer at the bottom of the widened subgrade, and is fully paved along the width of the widened subgrade on the top surface of the serrated joint surface of each layer of the existing subgrade.

[0009] Preferably, four layers of reinforced transition layers are arranged between the existing subgrade and the widened subgrade. The elastic modulus of the reinforcement materials from bottom to top is 80 MPa, 120 MPa, 160 MPa, and 200 MPa in sequence. And micro-prestressed piles are arranged at the reserved joint surface of the existing subgrade, with a pile diameter of 12 cm, a pile length of 180 cm, and the pile top is firmly connected to the transverse ribbed waste tire strip reinforcement body through a special lock-type connector.

[0010] Preferably, the transverse ribbed waste tire strip reinforcement body is accurately cut from waste and uniformly sized truck radial tires along the tread section, and the transverse ribs are arranged at equal intervals of 8-12 cm along the longitudinal direction of the tire strip, and the height of the transverse ribs gradually decreases from the center of the tire strip to both sides; the transverse ribbed waste tire strip reinforcement body is laid obliquely and fixed with a new type of alloy connector, the connection length ≥12 cm, and the connector has high tensile strength and corrosion resistance.

[0011] The present invention also provides a construction technical method for a reinforced and widened subgrade with transverse ribbed waste tire strips, comprising the following steps: Step 1: Pretreat the widened subgrade base, comprehensively remove obstacles within the base range, including tree roots, sundries, etc., fill and compact the potholes, clean and level the original ground and then compact it, with the compaction degree reaching over 92%; Step 2: Lay a buffer cushion layer made of a new type of lightweight composite material on the treated base, with the thickness precisely controlled at 25 cm; Step 3: Connect and fix the transverse rib waste tire strip reinforcement with new alloy connectors, obliquely spread it on the buffer cushion layer, arrange it staggeredly along the road direction, and anchor it firmly on the buffer cushion layer; Step 4: Trim the existing subgrade slope, layer by layer process a serrated joint surface from the slope inward. For the existing subgrade with a height exceeding 5 m, fully spread the transverse rib waste tire strip reinforcement on the top surface of each serrated joint surface along the width of the widened subgrade, and fix it on the widened subgrade with anchor bolts; Step 5: After completing the laying of the reinforcement, fill high-performance fillers according to the zoning plan of the widened subgrade. During the filling process, use an intelligent sprinkler system to precisely control the water spraying volume. After standing for a period of time, level it with a high-precision grader, control the moisture content of the filler within the optimal range through real-time monitoring equipment, and then fully compact it with an intelligent roller. Among them, the compaction passes for the depth of 0 - 60 cm are 7 - 9 times and the vibration frequency is 32 - 37 Hz; the compaction passes for 60 - 120 cm are 9 - 11 times and the vibration frequency is 37 - 42 Hz, ensuring that the widened subgrade is in a fully compacted state, and then fill the next layer; Step 6: Cycle the construction according to the above steps, finally form an innovative transverse rib waste tire strip reinforced widened subgrade, with the slope of the widened subgrade slope consistent with that of the existing subgrade slope, and set up an efficient drainage ditch outside the slope.

[0012] Preferably, during the laying process of the transverse rib waste tire strip reinforcement, use intelligent equipment to real-time monitor its laying position and fixation situation to ensure its close contact with the soil body and uniform distribution; the transverse rib height of the transverse rib waste tire strip reinforcement gradually decreases from the center to both sides, and the transverse rib spacing is 8 - 12 cm to enhance its friction and tensile strength with the soil body; the surface roughening treatment of the transverse rib waste tire strip reinforcement adopts a combination of mechanical grinding and chemical treatment to ensure that its surface roughness reaches Ra80μm, and 5% of nano-silica particles are uniformly added into the strip body to enhance its interaction with the soil body and its own mechanical properties.

[0013] Preferably, during the filling process of the filler, use an intelligent sprinkler system to precisely control the water spraying volume, and control the moisture content of the filler within the optimal range through real-time monitoring equipment to ensure the uniformity and compaction effect of the filler; the zoned filling of the widened subgrade uses high-performance fillers, and the selection of fillers is optimized according to the stress conditions of different regions to ensure the overall stability and settlement resistance of the widened subgrade.

[0014] Preferably, the oblique paving angle of the transverse rib waste tire strip reinforcement is 30° - 45° to enhance its interaction force with the soil mass and its ability to resist lateral displacement; the arrangement method of the transverse rib waste tire strip reinforcement is optimized according to the height of the existing subgrade and the width of the widened subgrade to ensure the maximization of its reinforcement effect.

[0015] The advantages of the present invention compared with the prior art are as follows: The present invention proposes a transverse rib waste tire strip-reinforced widened subgrade for the traditional geogrid-reinforced widened subgrade. A large number of waste tires are used, realizing the resource utilization of waste tires and reducing the pressure of random stacking and environmental pollution of waste. Surface roughening can increase the friction between the tire strip and the soil mass by 30% - 40%. Adding nano-silica can enhance its tensile strength by about 20%. The interaction between the transverse rib waste tire strip and the soil can effectively increase the shear strength of the soil mass and limit the vertical settlement of the soil. The setting of the transverse rib of the waste tire strip can effectively increase the lateral resistance and reduce the lateral displacement of the soil mass. Using the transverse rib waste tire strip instead of the traditional geogrid as the reinforcement material has a more obvious effect on reducing the differential settlement between the new and old subgrades and improving the overall stability of the widened subgrade.

[0016] The innovative transverse rib waste tire strip-reinforced widened subgrade of the present invention improves the overall performance through a unique structural design. The buffer cushion layer uses a new type of lightweight composite material to effectively disperse stress and reduce settlement. The serrated joint surfaces on both sides of the existing subgrade increase the contact area and friction force compared with the traditional steps, improving the connection stability. The transverse rib waste tire strip reinforcement is accurately arranged according to the height of the existing subgrade to maximize the reinforcement effect. The sectional filling technology of the widened subgrade selects suitable high-performance fillers for different stress areas to further optimize the subgrade performance.

[0017] The present invention uses intelligent devices to accurately control the laying thickness of the buffer cushion layer, the paving and fixing of the transverse rib waste tire strip reinforcement, and the water spraying amount, water content and compaction parameters during the filling process of the filler. Miniature prestressed piles are set at the joint surface of the existing subgrade and connected with the reinforcement through special connectors to enhance the overall structural stability.

[0018] The present invention uses waste tire strips with transverse ribs as the reinforcing material. The transverse ribs and the longitudinal tire strips together form a three-dimensional stereoscopic reinforcing material. Among them, the transverse ribs generate frictional resistance and bearing resistance on the soil, and the longitudinal tire strips also generate lateral frictional resistance on the soil, which can effectively limit the lateral displacement of the soil, firmly combine the new and old subgrades together to form a stable whole, and the waste tire strips with transverse ribs can effectively disperse the stress acting on the subgrade and reduce settlement deformation. The soil has a certain shear and compressive strength but a weak tensile strength, and the subgrade slope is prone to instability. The waste tire strips with transverse ribs have a very strong tensile strength, and the combination of the two to form a composite body can enhance the tensile strength and overall stability of the soil. Different from traditional grids, waste tire strips, as a ductile material, can effectively weaken the transmission effect of dynamic loads such as traffic and earthquakes in the subgrade.

[0019] The beneficial effects of the present invention are as follows: The main reinforcing material for the waste tire strips with transverse ribs to reinforce and widen the subgrade is the waste tire strips with transverse ribs. Compared with traditional grid reinforcing materials, the waste tire strips with transverse ribs have a higher ultimate tensile strength, better toughness, and better reinforcing effect. Using them as the reinforcing material has a more obvious effect on reducing the differential settlement between the new and old subgrades and improving the overall stability of the widened subgrade. The special structure and material properties of the waste tire strip reinforcement make it have excellent shock absorption performance, effectively weakening the impact of dynamic loads such as traffic and earthquakes on the subgrade. And adding nano-silica enhances its tensile strength and the overall stability of the widened subgrade. At the same time, the waste tire strips with transverse ribs belong to pollutants. Making full use of them not only solves problems such as the random stacking of waste materials, but also saves resources, reduces project costs, and plays a great role in improving the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a sectional view of the construction structure of the widened subgrade lap joint of the present invention.

[0022] Figure 3 It is a schematic diagram of the structure of the waste tire strip with transverse ribs of the present invention.

[0023] Figure 4 It is a detailed enlarged schematic diagram of the lap joint of the waste tire strip with transverse ribs of the present invention.

[0024] As shown in the figure: 1. Existing subgrade; 2. Widened subgrade; 3. Buffer cushion; 4. Waste tire strip with transverse ribs; 4-1. Top surface of the waste tire strip with transverse ribs; 4-2. Bottom surface of the waste tire strip with transverse ribs; 5. Original subgrade slope; 6. Step; 7. Widened subgrade slope; 8. Drainage ditch; 9. Rough surface of the waste tire strip with transverse ribs; 10. Transverse rib; 11. Binding form of the waste tire strip with transverse ribs; 12. Anchor bolt; 13. High-strength steel wire. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings.

[0026] A reinforced and widened subgrade with transverse ribbed waste tire strips includes: a buffer cushion layer 3 laid at the bottom of the widened subgrade 2, made of a new type of lightweight composite material, with a paving thickness of 25 cm; the two sides of the existing subgrade 1 are processed into serrated joint surfaces, the joint surfaces are provided with a slope of 3%-5% inward, the height of the joint surface is 60-120 cm, and the bottom width is 180 cm; the widened subgrade 2 is connected to the existing subgrade 1 through the serrated joint surface and is filled in sections; multiple layers of staggered transverse ribbed waste tire strip 4 reinforcement bodies are laid at the corresponding positions of the joint surface and the widened subgrade 2, and are arranged in a staggered manner along the road direction; the surface of the transverse ribbed waste tire strip 4 reinforcement body is roughened, and the roughness reaches Ra80μm, and 5% of nano-silica particles are uniformly added into the strip body to enhance its interaction with the soil and its own mechanical properties.

[0027] The buffer cushion layer 3 is made of a new type of lightweight composite material, with a paving thickness of 25 cm, and its material has high compressive strength and good stress dispersion performance; the serrated joint surfaces on both sides of the existing subgrade 1 are provided with a slope of 3%-5% inward, the height of the joint surface is 60-120 cm, and the bottom width is 180 cm, and the treatment of the joint surface, the filling of the widened subgrade 2 and the laying of the transverse ribbed waste tire strip 4 reinforcement body are carried out synchronously.

[0028] The layout method of the transverse ribbed waste tire strip 4 reinforcement body is as follows: for the existing subgrade 1 with a height not exceeding 5 m, the transverse ribbed waste tire strip 4 reinforcement body is laid in one layer at the bottom of the widened subgrade 2; for the existing subgrade 1 with a height exceeding 5 m, the transverse ribbed waste tire strip 4 reinforcement body is laid in one layer at the bottom of the widened subgrade 2, and is fully paved along the width of the widened subgrade 2 on the top surface of the serrated joint surface of each layer of the existing subgrade 1.

[0029] Four layers of reinforced transition layers are arranged between the existing subgrade 1 and the widened subgrade 2. The elastic modulus of the reinforcement materials from bottom to top is 80 MPa, 120 MPa, 160 MPa, and 200 MPa in sequence. Miniature prestressed piles are arranged at the reserved joint surface of the existing subgrade 1, with a pile diameter of 12 cm, a pile length of 180 cm, and the pile top is firmly connected to the transverse ribbed waste tire strip 4 reinforcement body through a special lock-type connector.

[0030] The transverse ribbed waste tire strip 4 reinforcement body is accurately cut from waste and uniformly sized truck radial tires along the tread section, and the transverse ribs are arranged at equal intervals of 8-12 cm along the longitudinal direction of the tire strip 4. The height of the transverse ribs gradually decreases from the center of the tire strip to both sides; the transverse ribbed waste tire strip 4 reinforcement body is laid obliquely and fixed with a new type of alloy connector, and the connection length ≥12 cm, and the connector has high tensile strength and corrosion resistance.

[0031] A construction technical method for a reinforced and widened roadbed with transverse rib waste tire strips, comprising the following steps: Step 1: Pretreat the base of the widened roadbed 2, comprehensively remove obstacles within the base range, including tree roots, sundries, etc., fill and compact the potholes, clean and level the original ground and then compact it, with the compaction degree reaching more than 92%; Step 2: Lay a buffer cushion layer 3 made of a new type of lightweight composite material on the treated base, with the thickness accurately controlled at 25 cm; Step 3: Connect and fix the transverse rib waste tire strip 4 reinforcement with a new type of alloy connector, obliquely pave it on the buffer cushion layer 3, arrange it staggeredly along the road direction, and anchor it firmly on the buffer cushion layer 3; Step 4: Trim the slope of the existing roadbed 1, layer by layer process a serrated joint surface from the slope inward. For the existing roadbed 1 with a height exceeding 5 m, fully pave the transverse rib waste tire strip 4 reinforcement on the top surface of each layer of the serrated joint surface along the width of the widened roadbed 2, and fix it on the widened roadbed 2 with anchor bolts; Step 5: After completing the laying of the reinforcement, according to the zoning plan of the widened roadbed 2, fill high-performance fillers respectively. During the filling process, use an intelligent sprinkler system to accurately control the water spraying volume. After standing for a period of time, level it with a high-precision grader, control the water content of the filler within the optimal range through a real-time monitoring device, and then fully compact it with an intelligent roller. Among them, the compaction passes for the depth of 0 - 60 cm are 7 - 9 times and the vibration frequency is 32 - 37 Hz; the compaction passes for 60 - 120 cm are 9 - 11 times and the vibration frequency is 37 - 42 Hz, ensuring that the widened roadbed is in a fully compacted state, and then fill the next layer; Step 6: Cycle construction according to the above steps, finally form an innovative transverse rib waste tire strip reinforced widened roadbed, with the slope of the widened roadbed 2 being consistent with the slope of the existing roadbed 1, and an efficient drainage ditch 8 is set outside the slope.

[0032] During the laying process of the transverse rib waste tire strip 4 reinforcement, use intelligent equipment to real-time monitor its laying position and fixation situation to ensure its close contact and uniform distribution with the soil mass; the transverse rib height of the transverse rib waste tire strip 4 reinforcement gradually decreases from the center to both sides, and the transverse rib spacing is 8 - 12 cm to enhance its friction and tensile strength with the soil mass; the surface roughening treatment of the transverse rib waste tire strip 4 reinforcement adopts a combination of mechanical grinding and chemical treatment to ensure that its surface roughness reaches Ra80μm, and 5% of nano-silica particles are uniformly added into the strip body to enhance its interaction with the soil mass and its own mechanical properties.

[0033] During the filling process of the filler, the intelligent sprinkler system is used to accurately control the amount of sprinkled water, and the water content of the filler is controlled within the optimal range through real-time monitoring equipment to ensure the uniformity and compaction effect of the filler; for the sectional filling of the widened subgrade 2, high-performance fillers are used, and the selection of fillers is optimized according to the stress conditions in different areas to ensure the overall stability and settlement resistance of the widened subgrade 2.

[0034] The diagonal paving angle of the transverse rib waste tire strip 4 reinforcement is 30° - 45° to enhance its interaction with the soil mass and the ability to resist lateral displacement; the layout method of the transverse rib waste tire strip 4 reinforcement is optimized according to the height of the existing subgrade 1 and the width of the widened subgrade 2 to ensure the maximization of its reinforcement effect.

[0035] When the present invention is specifically implemented, as Figures 1-4 shown: 1. Construction preparation: Before construction, detailed on-site investigation and design planning are required to ensure that the construction plan conforms to the actual terrain and geological conditions. The specific steps are as follows: On-site investigation: Conduct a detailed geological investigation on the existing subgrade 1 and the widened area to understand the soil conditions, groundwater level, stability of the existing subgrade, etc.

[0036] Material preparation: Prepare the required materials such as the transverse rib waste tire strip 4 reinforcement, buffer cushion layer 3 materials, high-performance fillers, new alloy connectors, micro-prestressed piles, etc., and ensure that their quality meets the design requirements.

[0037] Equipment preparation: Prepare construction equipment such as intelligent sprinkler systems, high-precision graders, intelligent rollers, real-time monitoring equipment, etc., and ensure that the equipment is in good condition.

[0038] 2. Subgrade base pretreatment Step 1: Pretreat the base of the widened subgrade 2, and comprehensively remove the obstacles within the base range, including tree roots, sundries, etc. Fill and compact the potholes to ensure the base is flat.

[0039] Step 2: After clearing and leveling the original ground, compact it so that the compaction degree reaches more than 92%. Use a roller for multiple compactions to ensure the stability of the subgrade base.

[0040] 3. Laying of buffer cushion layer Step 3: Lay the buffer cushion layer 3 made of a new type of lightweight composite material on the treated base, and accurately control the thickness to 25 cm. The buffer cushion layer 3 material has high compressive strength and good stress dispersion performance, which can effectively reduce subgrade settlement.

[0041] Step 4: Use intelligent equipment to real-time monitor the laying thickness of the buffer cushion layer to ensure its uniformity and density.

[0042] 4. Laying of the transverse rib waste tire strip reinforcement Step Five: Connect and fix the transverse rib waste tire strip 4 reinforcement with new alloy connectors, and lay it obliquely on the buffer cushion layer, arranging it staggered along the road direction. The oblique laying angle is 30° - 45° to enhance its interaction force with the soil and the ability to resist lateral displacement.

[0043] Step Six: Use ground anchors to stabilize the transverse rib waste tire strip 4 reinforcement on the buffer cushion layer 3 to ensure its close contact with the soil and uniform distribution.

[0044] Step Seven: Trim the slope of the existing subgrade 1, and process a serrated joint surface in layers from the slope inward. For the existing subgrade with a height exceeding 5m, lay the transverse rib waste tire strip reinforcement fully on the top surface of each serrated joint surface along the widened subgrade width, and fix it on the widened subgrade with anchor bolts.

[0045] 5. Filling of the widened subgrade Step Eight: After completing the laying of the reinforcement, fill high-performance fillers respectively according to the zoning plan of the widened subgrade. The selection of fillers is optimized according to the stress conditions in different regions to ensure the overall stability and settlement resistance of the widened subgrade.

[0046] Step Nine: During the filling process, use an intelligent sprinkler system to accurately control the water spraying volume. After standing for a period of time, use a high-precision grader to level it, and control the moisture content of the filler within the optimal range through real-time monitoring equipment.

[0047] Step Ten: Use an intelligent roller to fully compact the filler. Among them, the compaction passes for the depth of 0 - 60cm are 7 - 9 times, and the vibration frequency is 32 - 37Hz; the compaction passes for 60 - 120cm are 9 - 11 times, and the vibration frequency is 37 - 42Hz. Ensure that the widened subgrade is in a fully compacted state, and then fill the next layer.

[0048] 6. Setting of the reinforced transition layer Step Eleven: Set four layers of reinforced transition layers between the existing subgrade and the widened subgrade. The elastic modulus of the reinforcement materials from bottom to top is 80MPa, 120MPa, 160MPa, and 200MPa in sequence. The setting of the reinforced transition layer can effectively disperse stress and reduce the differential settlement between the new and old subgrades.

[0049] Step Twelve: Set micro prestressed piles at the reserved joint surface of the existing subgrade. The pile diameter is 12cm, the pile length is 180cm, and the pile top is firmly connected to the transverse rib waste tire strip reinforcement through a special lock-type connector to enhance the overall structural stability.

[0050] 7. Slope treatment and drainage system setting Step Thirteen: Broaden the slope of the subgrade to be consistent with the existing subgrade slope, and install an efficient drainage ditch outside the slope to ensure smooth drainage of the subgrade and prevent the impact of water accumulation on the stability of the subgrade.

[0051] 8. Construction Quality Control Step Fourteen: During the construction process, use intelligent devices to monitor various construction parameters in real time, including the thickness of the buffer cushion layer, the laying position and fixation of the transverse rib waste tire strip reinforcement, the water content and compaction degree of the filler, etc., to ensure that the construction quality meets the design requirements.

[0052] Step Fifteen: After the construction is completed, conduct a comprehensive quality inspection, including the compaction degree of the subgrade, the fixation of the transverse rib waste tire strip reinforcement, the smoothness of the drainage system, etc., to ensure the overall stability and durability of the broadened subgrade.

[0053] 9. Construction Safety and Environmental Protection Measures Step Sixteen: During the construction process, strictly abide by the safety operation procedures to ensure the safety of construction personnel. Especially during the laying of the transverse rib waste tire strip reinforcement and the filling of the subgrade, use protective equipment to prevent accidents.

[0054] Step Seventeen: The waste and waste materials generated during the construction process should be classified and treated to minimize the impact on the environment. The use of waste tire strips not only solves the problem of random stacking of waste materials but also realizes the recycling and reuse of resources, with good environmental protection benefits.

[0055] 10. Construction Acceptance Step Eighteen: After the construction is completed, organize relevant units for acceptance to ensure that all indicators of the broadened subgrade meet the design requirements and relevant specifications. The acceptance content includes the compaction degree of the subgrade, the fixation of the transverse rib waste tire strip reinforcement, the smoothness of the drainage system, etc.

[0056] Step Nineteen: After passing the acceptance, carry out the maintenance work of the subgrade to ensure the stability and durability of the broadened subgrade during use.

[0057] Through the above specific implementation methods, the transverse rib waste tire strip reinforced broadened subgrade and its construction technology method provided by the present invention can effectively solve the differential settlement problem between the new and old subgrades, improve the overall stability and durability of the broadened subgrade, and at the same time realize the resource utilization of waste tires, with good economic and environmental protection benefits.

[0058] The above describes the present invention and its implementation manners. Such description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. In summary, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, creatively design structural manners and embodiments similar to this technical solution, they shall fall within the protection scope of the present invention.

Claims

1. A roadbed widening reinforcement using waste tire strips with transverse ribs, characterized in that: include: The buffer layer (3) is laid at the bottom of the widened roadbed (2) and is made of a new lightweight composite material with a paving thickness of 25 cm; The existing roadbed (1) has two sides treated as sawtooth joint surfaces, the joint surface is set with an inward slope of 3%-5%, the joint surface height is 60-120cm, and the bottom width is 180cm; The widened roadbed (2) is connected to the existing roadbed (1) via a sawtooth joint surface and is filled in sections; multiple layers of staggered transverse rib waste tire strips (4) reinforcement bodies are laid at corresponding positions of the joint surface and the widened roadbed (2) and are staggered along the road direction; the surface of the transverse rib waste tire strips (4) reinforcement bodies is roughened to a roughness of Ra80μm, and 5% of nano-silicon dioxide particles are uniformly added inside the strips to enhance their interaction with the soil and their own mechanical properties.

2. The method of reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 1 is characterized by: The buffer cushion layer (3) is made of a new light composite material with a paving thickness of 25 cm, and the material has high compressive strength and good stress dispersion performance; the serrated connecting surfaces on both sides of the existing roadbed (1) are set with an inward slope of 3%-5%, the connecting surface height is 60-120 cm, and the bottom width is 180 cm, and the processing of the connecting surface, filling and widening the roadbed (2) and laying of the cross-rib waste tire strips (4) reinforcement body are carried out simultaneously.

3. The method of reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 1 is characterized by: The arrangement of the transverse rib waste tire strip (4) reinforcement body is as follows: for an existing roadbed (1) with a height not exceeding 5 m, the transverse rib waste tire strip (4) reinforcement body is laid in one layer at the bottom of the widened roadbed (2); for an existing roadbed (1) with a height exceeding 5 m, the transverse rib waste tire strip (4) reinforcement body is laid in one layer at the bottom of the widened roadbed (2), and the top surface of the serrated connection surface of each layer of the existing roadbed (1) is fully laid along the width of the widened roadbed (2).

4. The method of reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 1 is characterized by: Four reinforced transition layers are arranged between the existing roadbed (1) and the widened roadbed (2), and the elastic moduli of the reinforcement materials are 80MPa, 120MPa, 160MPa, and 200MPa, respectively, from bottom to top. Micro prestressed piles are arranged at the reserved connection surface of the existing roadbed (1), with a pile diameter of 12cm and a pile length of 180cm. The pile tops are firmly connected to the cross-rib waste tire strip (4) reinforcement body through special lock-type connectors.

5. The method of reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 1 is characterized by: The transverse rib waste tire strip (4) reinforcement is formed by precisely cutting waste truck radial tires of the same specifications along the tread section, and the transverse ribs are arranged at equal intervals of 8-12 cm along the longitudinal direction of the tire strip (4), and the height of the transverse ribs gradually decreases from the center of the tire strip to both sides; the transverse rib waste tire strip (4) reinforcement is paved obliquely and fixed by using a new alloy connector, the connection length is ≥12 cm, and the connector has high tensile strength and corrosion resistance.

6. A construction technology method for widening roadbed by reinforcing with cross-rib waste tire strips, characterized in that: The following steps are involved: Step 1: Pre-treat the base of the widened roadbed (2), completely remove obstacles within the base range, including tree roots, debris, etc., fill and compact potholes, clean and level the original ground, and compact it to a compaction degree of more than 92%; Step 2: Laying a cushion layer (3) made of a new lightweight composite material on the treated substrate, with the thickness precisely controlled to be 25 cm; Step 3: The reinforcement bodies of the transverse rib waste tire strips (4) are connected and fixed with new alloy connectors, spread obliquely on the cushion layer (3), arranged in a staggered manner along the road direction, and secured on the cushion layer (3) with ground anchors; Step 4: trimming the slope of the existing roadbed (1), processing the sawtooth joint surface in layers from the slope inward, and for the existing roadbed (1) with a height of more than 5m, laying the cross-rib waste tire strip (4) reinforcement body along the width of the widened roadbed (2) on the top surface of each layer of the sawtooth joint surface, and fixing it on the widened roadbed (2) with anchors; Step 5: After the reinforcement is laid, high-performance fillers are filled in according to the zoning plan of the widened roadbed (2). During the filling process, the intelligent watering system is used to accurately control the amount of watering. After standing for a period of time, a high-precision grader is used to level the filler. The moisture content of the filler is controlled within the optimal range through real-time monitoring equipment, and then the intelligent roller is used to fully compact the filler. The number of compaction times for a depth of 0-60 cm is 7-9 times, and the vibration frequency is 32-37 Hz; the number of compaction times for a depth of 60-120 cm is 9-11 times, and the vibration frequency is 37-42 Hz. Ensure that the widened roadbed is in a fully compacted state, and then fill the next layer; Step 6: Repeat the above steps to finally form an innovative cross-rib waste tire strip reinforced widening roadbed. The slope of the widened roadbed (2) is consistent with the slope of the existing roadbed (1), and an efficient drainage ditch (8) is set on the outer side of the slope.

7. The construction technology method for reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 6 is characterized by: During the laying process of the cross-rib waste tire strip (4) reinforcement body, an intelligent device is used to monitor its laying position and fixing status in real time to ensure its close contact with the soil and uniform distribution; the cross-rib height of the cross-rib waste tire strip (4) reinforcement body gradually decreases from the center to both sides, and the cross-rib spacing is 8-12 cm, so as to enhance the friction and tensile strength between the cross-rib waste tire strip (4) and the soil; the surface roughening treatment of the cross-rib waste tire strip (4) reinforcement body adopts a combination of mechanical grinding and chemical treatment to ensure that its surface roughness reaches Ra80μm, and 5% of nano-silicon dioxide particles are evenly added in the strip to enhance its interaction with the soil and its own mechanical properties.

8. The construction technology method for reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 6 is characterized by: During the filling process, an intelligent watering system is used to accurately control the amount of watering, and the moisture content of the filler is controlled within an optimal range through real-time monitoring equipment to ensure the uniformity and compaction effect of the filler; high-performance fillers are used for the zoning filling of the widened roadbed (2), and the selection of fillers is optimized according to the stress conditions of different areas to ensure the overall stability and anti-settling performance of the widened roadbed (2).

9. The construction technology method for reinforcing and widening the roadbed with cross-rib waste tire strips according to claim 6 is characterized by: The oblique paving angle of the transverse rib waste tire strip (4) reinforcement body is 30°-45°, so as to enhance the interaction force between the reinforcement body and the soil body and the ability to resist lateral displacement; the arrangement of the transverse rib waste tire strip (4) reinforcement body is optimized according to the height of the existing roadbed (1) and the width of the widened roadbed (2), so as to ensure that the reinforcement effect is maximized.

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