Construction method for pouring type solidified soil roadbed and base layer of highway

Abstract

The invention discloses a construction method of a highway pouring type solidified soil roadbed and base layer. The construction method comprises the following steps: S1, manufacturing a pouring type solidified soil track beam; s2, layered paving is carried out; s3, arching and leveling are carried out; and S4, joint cutting and curing. The construction method has the advantages of being high in construction speed, high in roadbed and base layer top surface flatness, capable of reducing constructors and the like, and can be applied to new construction and reconstruction and extension projects of roads of various grades.

Description

Technical Field

[0001] The present invention relates to the field of road construction, and more specifically, to a construction method for a highway pouring type solidified soil roadbed and base. Background Art

[0003] At present, the total mileage of highways in China has reached 5.2807 million kilometers. In the stage of "equal emphasis on construction and maintenance", a large amount of waste milling materials and waste soil (silt clay) will be generated in the road reconstruction and expansion project, which are difficult to handle. The filling materials for the roadbed and base of the new road require a large amount of natural sand and gravel, the source of which is difficult to guarantee, and will cause irreversible impacts on resources, environment and ecology. Casting type solidified soil is a pumpable mixed material formed by mixing old road water-stable milling materials or waste slag, waste soil / silt, binder and clean water. After casting, it has good integrity, and the waste materials can be recycled and reused, reducing the dependence of road construction on natural sand and gravel.

[0004] In the process of pouring solidified soil to fill the roadbed and base of the highway, the paving and leveling of the solidified soil must meet the requirements of highway construction, facing the following two thorny problems: ① The slump loss of cast-type solidified soil over time is fast, the viscosity is high, and the casting width exceeds 6m, which makes it difficult for construction workers to carry out construction work. If the section construction method is adopted, reflective cracks on the road surface are likely to form in the later stage. ② During the paving and leveling construction process, the surface viscosity can be reduced by spraying water on the surface, but it is difficult to control the amount of water added, which will affect the overall quality. If no water is added, the viscosity is high, and the surface solidified soil is easy to stick to the construction tools, making it difficult for construction workers to carry out the construction work and making leveling construction difficult.

[0005] There is still no relevant patent to solve the above-mentioned problems existing in the process of pouring type solidified soil paving and leveling construction. Therefore, a pouring type solidified soil highway roadbed and base paving and leveling construction method is proposed. Summary of the invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a highway cast-type solidified soil roadbed and base paving and leveling construction method, which has the advantages of fast construction speed, high flatness of the roadbed and base top surface, and reduction of construction personnel, and can be applied to new construction, renovation and expansion projects of roads of all grades.

[0007] The technical solution adopted by the present invention to solve this technical problem is: a construction method for a highway pouring type solidified soil roadbed and base layer, comprising the following steps: S1. Manufacturing cast-in-place solidified soil track beams; S2, layered paving; S3, arching and leveling; S4. Incision and health preservation.

[0008] As a further solution of the present invention, the step S1 specifically comprises: S11. In addition to the size of the highway base structure, a single-side track beam template is erected in the road trench, with the top width of the track beam ≥ 20cm and the bottom width ≥ 25cm; S12. Measure and lay out to ensure that the track beam elevation is 5-6 cm lower than the top surface of the base, and use low-strength cast-type solidified soil to cast the track beam; S13. After the track beam is formed and the formwork is removed, the track beam pad is laid to form a solidified soil track beam to ensure the smooth movement of the three-roller shaft.

[0009] As a further solution of the present invention, the track beam pad is formed by welding channel steel and steel plate.

[0010] As a further solution of the present invention, the step S2 specifically includes: S21. Adjust the mix ratio of the solidified soil to make it suitable for transportation by concrete tank trucks, and use concrete tank trucks or pump trucks to transport the poured solidified soil; S22. After the cast-in-place solidified soil is transported to the road trench, it is spread using an excavator equipped with a scraper.

[0011] As a further solution of the present invention, the arching and leveling in step S3 adopts an integrated leveling device and a laser controller, and the laser controller is used to measure the top elevation of the solidified soil track beam.

[0012] As a further solution of the present invention, the integrated leveling device includes: three rollers, vibration-exhausting vibrating rods, spray-exhausting sprayers, and a walkway; the vibration-exhausting vibrating rods are arranged on the steel truss beams of the three-roller shafts at a certain interval; the spray-exhausting sprayers are arranged on the steel truss beams at a certain interval, staggered with the vibration-exhausting vibrating rods.

[0013] As a further solution of the present invention, the three-roller shaft comprises a roller shaft, a crawler-type running wheel and a steel truss crossbeam; The two ends of the steel truss beam are equipped with lifting screw assemblies so that the steel truss beam can move up and down. The top of the screw in the lifting screw assembly is equipped with a lifting screw handle for convenient rotation of the lifting screw. The lifting screw assembly also includes a nut, which is screwed on the lifting screw and fixed to the steel truss beam. The lower end of the lifting screw assembly is connected to the crawler walking wheel through a bearing, and the crawler walking wheel can drive the steel truss beam to walk along the length direction of the roadbed. A roller shaft is installed below the steel truss beam, and an even number of roller shafts are arranged in each row along the transverse direction of the roadbed and are symmetrically installed along the transverse center line of the roadbed. Both ends of the roller shaft are equipped with spherical roller bearings, wherein the spherical roller bearings at one end of the outer side of the roller shafts at both ends below the steel truss beam are connected to the steel truss beam through a connecting rod, and the spherical roller bearings at both ends of the remaining roller shafts are connected to the spherical roller bearings of adjacent roller shafts through a connecting rod, and the middle of the connecting rod is connected to the steel truss beam through an automatic lifting rod. The rollers include vibrating rollers, driving rollers and slurry-throwing rollers. The three types of rollers are installed in three rows along the length of the roadbed and below the steel truss beams. The same type of rollers in each row are even in number and are installed symmetrically along the transverse center line of the roadbed. Figure 2 As shown, four rollers are arranged in each row and are arranged symmetrically in pairs. The three-roller structure can achieve that each roller on both sides of the roadbed centerline is raised to a certain angle to form a slope and complete the arching.

[0014] As a further solution of the present invention, the laser controller includes a laser transmitter and a laser signal receiver.

[0015] As a further solution of the present invention, the step S3 specifically includes: S31, hoisting the three rollers on the track beam, walking on the track beam by crawler wheels, using a laser transmitter to emit laser to the track beam pad, and determining the top elevation of the track beam pad by receiving the laser reflection signal; adjusting the elevation of the middle and both sides of the bottom of the rollers by roller lifting rods to make them consistent with the elevation of the center line and side line of a certain layer of the road, respectively, to ensure a two-way cross slope, thereby achieving arching; S32: When the pouring type solidified soil paving length is ≥3m, the three rollers start to move for the first time, with a walking speed of 1~1.5m / min, and the vibration rods are started at the same time to ensure that the pouring type solidified soil is vibrated and compacted; S33, the vibration rod stops and lifts away from the casting surface, the spray sprayer starts, and the three-roller moves for the second time at a speed of 1.5~2.5m / min to ensure that the surface of the cast-type solidified soil is flat and non-sticky.

[0016] As a further solution of the present invention, the step S4 specifically includes: S41. Within 3 hours after paving and leveling, cover with film for early water retention and curing; S42. After the early curing film is uncovered on the second day, an induction seam needs to be set horizontally on the top surface of the base layer, with a seam width of 4-6 mm, a seam depth of 8-15 cm, and a seam spacing of 15-20 m, and hot-modified asphalt is used for filling the seams; S43. After the grouting treatment is completed, cover the geotextile and sprinkle water to keep it moisturized.

[0017] The present invention has at least the following beneficial effects: (1) The present invention adopts full-width construction to avoid the occurrence of longitudinal cracks on the road surface caused by section-by-section construction; (2) The present invention adopts the vibration and spraying method, which can make the solidified soil fully dense during the pouring process, and the surface is not sticky, which is easy to control the surface flatness and bidirectional cross slope; (3) The filling materials used in the present invention fully recycle the waste soil within the route range, reduce the consumption of natural resources, and effectively reduce the cost of construction materials; (4) The solidified slag used in the present invention has good integrity and can effectively transfer the load borne by the road surface, avoid differential settlement of the roadbed, and reduce the occurrence of reflective cracks.

[0018] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the integrated leveling device of the present invention; Figure 2 It is a cross-sectional view of the roadbed top surface leveling construction according to an embodiment of the present invention; Figure 3 This is a cross-sectional view of the base layer top surface leveling construction according to an embodiment of the present invention.

[0020] Among them, 1-spherical roller bearing, 2-automatic lifting rod, 3-discharge sprayer, 4-roller, 5-tracked walking wheel, 6-lifting screw assembly, 7-lifting screw handle, 8-discharge vibration rod, 9-connecting rod, 10-discharge spray tank, 11-pedestrian walkway, 12-solidified soil track beam, 13-track beam pad, 14-laser transmitter, 15-laser signal receiver. DETAILED DESCRIPTION

[0021] The present invention is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the present invention, including the following description, can be combined with each other without conflict.

[0022] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and implementations, and its specific implementation process is as follows: like Figure 1 As shown, the present invention provides a construction method for a highway pouring type solidified soil roadbed and base, comprising the following steps: S1, manufacturing cast-in-place solidified soil track beam 12; S2, layered paving; S3, arching and leveling; S4. Incision and health preservation.

[0024] This technical solution may also include the following technical details to better achieve the technical effect: Step S1 specifically includes: S11. In addition to the size of the highway base structure, a single-side track beam template is erected in the road trench, with the top width of the track beam ≥ 20cm and the bottom width ≥ 25cm; S12. Measure and lay out to ensure that the track beam elevation is 5-6 cm lower than the top surface of the base, and use low-strength cast-type solidified soil to cast the track beam; S13, after the track beam is formed and the mold is removed, the track beam pad 13 is laid to form a solidified soil track beam 12 to ensure the smooth movement of the three-roller shaft 4.

[0025] The technical solution may also include the following technical details to better achieve the technical effect: the track beam pad 13 is formed by welding channel steel and steel plate.

[0026] This technical solution may also include the following technical details to better achieve the technical effect: Step S2 specifically includes: S21. Adjust the mix ratio of the solidified soil to make it suitable for transportation by concrete tank trucks, and use concrete tank trucks or pump trucks to transport the poured solidified soil; S22. After the cast-in-place solidified soil is transported to the road trench, it is spread using an excavator equipped with a scraper.

[0027] The present technical solution may also include the following technical details to better achieve the technical effect: the arching and leveling in step S3 adopts an integrated leveling device and a laser controller, and the laser controller is used to measure the top elevation of the solidified soil track beam 12.

[0028] The present technical scheme may also include the following technical details to better achieve the technical effect: the integrated leveling device includes: three rollers 4, row vibration rods 8, row spray sprayers 3, and a pedestrian walkway 11; the row vibration rods 8 are arranged on the steel truss beams of the three-roller shaft 4 at a certain interval; the row spray sprayers 3 are arranged on the steel truss beams at a certain interval and staggered with the row vibration rods 8, and the row spray sprayers 3 are connected to the row spray water tank 10.

[0029] The technical solution may also include the following technical details to better achieve the technical effect: the three-roller shaft 4 includes a roller shaft 4, a crawler-type walking wheel 5 and a steel truss beam; The two ends of the steel truss beam are installed with lifting screw assemblies 6, so that the steel truss beam can move up and down. The top of the screw in the lifting screw assembly 6 is installed with a lifting screw handle 7 to facilitate the rotation of the lifting screw. The lifting screw assembly 6 also includes a nut, which is screwed on the lifting screw. The nut is fixed to the steel truss beam. The lower end of the lifting screw assembly 6 is connected to the crawler walking wheel 5 through a bearing. The crawler walking wheel 5 can drive the steel truss beam to move along the length direction of the roadbed. Roller shafts 4 are installed at the bottom, and an even number of roller shafts 4 are arranged in each row along the horizontal direction of the roadbed and are installed symmetrically along the horizontal center line of the roadbed. Spherical roller bearings 1 are installed at both ends of the roller shafts 4, and the spherical roller bearings 1 at the outer ends of the roller shafts 4 at both ends below the steel truss beam are connected to the steel truss beam through a connecting rod, and the spherical roller bearings 1 at both ends of the remaining roller shafts 4 are connected to the spherical roller bearings 1 of the adjacent roller shafts 4 through a connecting rod 9, and the middle of the connecting rod 9 is connected to the steel truss beam through an automatic lifting rod 2. The roller shafts 4 include vibrating rollers, driving rollers and slurry throwing rollers. The three types of roller shafts 4 are installed in three rows at intervals below the steel truss beam along the length direction of the roadbed. The number of the same type of roller shafts 4 in each row is even, and they are installed symmetrically along the horizontal center line of the roadbed. Figure 2 As shown, four rollers 4 are arranged in each row and are arranged symmetrically in pairs. The structural form of three rollers 4 can realize that each roller 4 on both sides of the center line of the roadbed is raised to a certain angle to form a slope to complete the arching.

[0030] This technical solution may also include the following technical details to better achieve the technical effect: the laser controller includes a laser transmitter 14 and a laser signal receiver 15 .

[0031] This technical solution may also include the following technical details to better achieve the technical effect: Step S3 specifically includes: S31, hoisting the three-roller shaft 4 on the track beam, walking on the track beam through the crawler walking wheel 5, using the laser transmitter 14 to emit laser to the track beam pad 13, and determining the top elevation of the track beam pad 13 by receiving the laser reflection signal; adjusting the elevation of the middle and both sides of the bottom of the roller shaft 4 through the lifting rod of the roller shaft 4, so that they are respectively consistent with the elevation of the center line and the side line of a certain layer of the road, ensuring a two-way cross slope, thereby realizing arching; S32, when the pouring type solidified soil paving length is ≥3m, the three-roller shaft 4 starts to move for the first time, with a walking speed of 1-1.5m / min, and the vibration rod 8 is started at the same time to ensure that the pouring type solidified soil is vibrated and compacted; S33, the vibration rod 8 stops and is lifted away from the casting surface, the spray sprayer 3 is started, and the three-roller shaft 4 moves for the second time at a speed of 1.5-2.5 m / min to ensure that the surface of the cast-type solidified soil is flat and non-sticky.

[0032] This technical solution may also include the following technical details to better achieve the technical effect: Step S4 specifically includes: S41. Within 3 hours after paving and leveling, cover with film for early water retention and curing; S42. After the early curing film is uncovered on the second day, an induction seam needs to be set horizontally on the top surface of the base layer, with a seam width of 4-6 mm, a seam depth of 8-15 cm, and a seam spacing of 15-20 m, and hot-modified asphalt is used for filling the seams; S43. After the grouting treatment is completed, cover the geotextile and sprinkle water to keep it moisturized.

[0033] Example 1 like Figure 2~3 As shown, the construction of cast-in-place solidified soil roadbed and base layer of Highway 1# has the following basic information: the construction section is a large and medium-sized maintenance section, a secondary highway with a design speed of 80km / h, the design width of the roadbed is 12.3m, and the replacement thickness is 100cm; the design width of the base layer is 12.3m, and the thickness is 32cm; the design width of the subbase layer is 12.3m, and the thickness is 20cm; the roadbed and base layer are constructed using cast-in-place solidified soil.

[0034] Step 1: Dig a road trench with a width of 12.3m and a depth of 1.61m.

[0035] Step 2: Set up a single-side track beam template in the road trough, with the top width of the track beam ≥ 20cm and the bottom width ≥ 25cm; Step 3: Measure and lay out to ensure that the track beam elevation is 6 cm lower than the top surface of the base, and use cast-type solidified soil with strength grade M3 to cast the track beam; Step 4: After the track beam is formed for 1 day, the mold is removed and the track beam pad 13 (channel steel width 14 cm, steel plate width 16 cm) is laid to ensure the smooth movement of the three-roller shaft 4; Step 5: Adjust the mix ratio of the solidified soil to make it suitable for transportation by concrete tank trucks; Step 6: After the freshly poured solidified soil is transported to the road trench, it is spread using an excavator equipped with a scraper; Step 7: hoist the three-roller shaft 4 that can be lifted and lowered on the track beam, use the laser transmitter 14 to emit the laser to the track beam pad 13, and determine the top elevation of the track beam pad 13 by receiving the laser reflection signal. Adjust the elevation of the middle and both sides of the bottom of the roller shaft 4 through the lifting rod of the roller shaft 4 to make them consistent with the elevation of the center line and side line of a certain layer of the road, ensure the two-way cross slope, and realize the arch.

[0036] Step 8: When the pouring type solidified soil paving length reaches 6m, the three-roller shaft 4 starts to move for the first time, with a walking speed of 1-1.5m / min, and the vibration rod 8 is started at the same time to ensure that the pouring type solidified soil is vibrated and compacted; Step 9: The vibration rod 8 stops and is lifted away from the casting surface, the spray sprayer 3 is started, and the three-roller shaft 4 moves for the second time at a speed of 1.5-2.5 m / min to ensure that the surface of the cast-type solidified soil is flat and non-sticky, and leveling is achieved.

[0037] Step 10: Within 3 hours after paving and leveling, the film should be covered for early water retention and curing; Step 11: After the early curing film is uncovered on the second day, an induction seam needs to be set horizontally on the top surface of the base layer, with a seam width of 6mm, a seam depth of 12cm, and a seam spacing of 16m, and hot-modified asphalt is used for filling the seams; Step 12: After the grouting treatment is completed, cover the geotextile and sprinkle water to keep it moisturized; Step 13: After curing for 5 days, repeat steps 5 to 12 to spread and level the next layer. In this embodiment, the roadbed has five layers, namely, the solidified soil lower roadbed, the solidified soil upper roadbed, the solidified soil functional layer, the solidified soil slag base layer and the subbase layer.

[0038] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A construction method for a highway cast-type solidified soil roadbed and base, characterized in that: The following steps are involved: S1. Manufacturing cast-in-place solidified soil track beams; S2, layered paving; S3, arching and leveling; S4. Incision and health preservation.

2. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 1, characterized in that: The step S1 specifically includes: S11. Outside the size of the highway base structure, a single-side track beam template is erected in the road trench; S12. Measure and lay out to ensure that the track beam elevation is lower than the top surface of the base layer, and use cast-type solidified soil to cast the track beam; S13. After the track beam is formed and the formwork is removed, the track beam pad is laid to form a solidified soil track beam.

3. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 2, characterized in that: The track beam pad is formed by welding channel steel and steel plate.

4. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 2, characterized in that: The step S2 specifically includes: S21. Use concrete tank trucks or pump trucks to transport poured solidified soil; S22. After the cast-in-place solidified soil is transported to the road trench, it is spread using an excavator equipped with a scraper.

5. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 1, characterized in that: The arching and leveling in step S3 uses an integrated leveling device and a laser controller, and the laser controller is used to measure the top elevation of the solidified soil track beam.

6. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 5, characterized in that: The integrated leveling device comprises: three rollers, vibration rods, spray sprayers, and a walkway; the vibration rods are arranged on the steel truss beams of the three rollers at a certain interval; the spray sprayers are arranged on the steel truss beams at a certain interval and staggered with the vibration rods.

7. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 6, characterized in that: The three-roller shaft includes a roller shaft, a crawler-type running wheel and a steel truss beam; Lifting screw assemblies are installed at both ends of the steel truss beam to enable the steel truss beam to move up and down. The lower end of the lifting screw assembly is connected to the crawler walking wheel through a bearing, and the crawler walking wheel can drive the steel truss beam to move along the length direction of the roadbed. Rollers are installed below the steel truss beam, and an even number of rollers are arranged in each row along the transverse direction of the roadbed and are symmetrically installed along the transverse center line of the roadbed. Self-aligning roller bearings are installed at both ends of the rollers, and the self-aligning roller bearings at one end of the outer side of the rollers at both ends below the steel truss beam are connected to the steel truss beam through a connecting rod, and the self-aligning roller bearings at both ends of the remaining rollers are connected to the self-aligning roller bearings of the adjacent rollers through a connecting rod, and the middle of the connecting rod is connected to the steel truss beam through an automatic lifting rod.

8. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 7, characterized in that: The laser controller includes a laser transmitter and a laser signal receiver.

9. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 8, characterized in that: The step S3 specifically includes: S31, hoisting the three rollers on the track beam, walking on the track beam by crawler wheels, using a laser transmitter to emit laser to the track beam pad, and determining the top elevation of the track beam pad by receiving the laser reflection signal; adjusting the elevation of the middle and both sides of the bottom of the rollers by roller lifting rods to make them consistent with the elevation of the center line and side line of a certain layer of the road, respectively, to ensure a two-way cross slope, thereby achieving arching; S32: When the pouring type solidified soil paving length is ≥3m, the three rollers start to move for the first time, with a walking speed of 1~1.5m / min, and the vibration rods are started at the same time to ensure that the pouring type solidified soil is vibrated and compacted; S33, the vibration rod stops and lifts away from the casting surface, the spray sprayer starts, and the three-roller moves for the second time at a speed of 1.5~2.5m / min to ensure that the surface of the cast-type solidified soil is flat and non-sticky.

10. The construction method of the highway pouring type solidified soil roadbed and base as claimed in claim 1, characterized in that: The step S4 specifically includes: S41. Within 3 hours after paving and leveling, cover with film for early water retention and curing; S42. After the early curing film is uncovered on the second day, an induction seam needs to be set horizontally on the top surface of the base layer, with a seam width of 4-6 mm, a seam depth of 8-15 cm, and a seam spacing of 15-20 m, and hot-modified asphalt is used for filling the seams; S43. After the grouting treatment is completed, cover the geotextile and sprinkle water to keep it moisturized.

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