Foam concrete light embankment capable of alternately maintaining traffic by lifting longitudinal slope during reconstruction and extension of road

Abstract

The invention relates to a foam concrete light-weight embankment capable of alternately maintaining traffic by lifting a longitudinal slope during reconstruction and expansion of a road, which adopts foam concrete to construct and expand the embankment and to lift the embankment by the longitudinal slope, so that the dead weight of the embankment is reduced, the settlement amount of a new roadbed is reduced, the differential settlement between the new roadbed and the old roadbed is reduced, and the later maintenance cost is reduced; during foam concrete construction, a plurality of reinforcing mesh anchoring measures are set layer by layer, so that the stability of the reinforcing meshes in the foam concrete pouring process is improved, and the construction quality of the light embankment is further improved; the new roadbed and the old roadbed are anchored through the reinforcing mesh hanging type supports, the Z-shaped supports and the claw-shaped supports, and the integrity between the original roadbed and the widened longitudinal slope lifting embankment is improved.

Description

Technical Field

[0001] The invention belongs to the field of existing roadbed widening and longitudinal slope lifting construction, and in particular relates to a highway reconstruction and expansion longitudinal slope lifting and alternately maintaining traffic with foamed concrete lightweight embankment. Background Art

[0002] With the acceleration of urbanization and the continuous growth of traffic demand, highway reconstruction and expansion projects have become an important task in the current transportation construction field. In the process of highway reconstruction and expansion, longitudinal slope lifting is a key technical challenge, which requires the effective improvement of the longitudinal slope of the road while ensuring the stability and safety of the road. Traditional highway reconstruction and expansion methods often face many difficulties, such as difficult construction, long cycle, and great impact on traffic. Especially when carrying out longitudinal slope lifting, traditional construction methods often cannot ensure the uniform settlement and stability of the new and old roadbeds, thus bringing hidden dangers to the safe operation of the road.

[0003] In order to solve this problem, foam concrete lightweight embankment technology came into being. As a lightweight, high-strength building material, foam concrete has excellent mechanical properties and is easy to construct. In highway reconstruction and expansion, the use of foam concrete lightweight embankment technology can effectively raise the longitudinal slope while ensuring uniform settlement and stability of the new and old roadbeds.

[0004] However, based on the complex construction conditions and high requirements for construction quality of the project, it is still of great significance to innovate a lightweight foam concrete embankment and construction method for highway reconstruction and expansion with longitudinal slope lifting and alternating maintenance, which has high construction efficiency, excellent construction quality and low safety risk, in order to improve the construction quality of roadbed widening and longitudinal slope lifting. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a highway reconstruction and expansion longitudinal slope lifting and alternately maintaining the passability of foamed concrete lightweight embankment.

[0006] The construction method of the highway reconstruction and expansion longitudinal slope lifting and alternately maintaining the trafficability of foamed concrete lightweight embankment comprises the following steps: Step 1: Support formwork and cast gravity retaining wall; Step 2: dig steps on the side of the original embankment, then construct slag and concrete leveling, and install embedded steel during leveling construction; Step 3: Install the prefabricated panel on the gravity retaining wall and install the steel mesh hanging bracket; Step 4: construct steel mesh and foam concrete layer by layer between the prefabricated panel and the original embankment until the designed elevation is reached; Step 5: First, cast the raised road surface on the original embankment and foam concrete on one side, and use the other side as a road-keeping pavement.

[0007] Preferably, in step one, the formwork of the gravity retaining wall includes a front formwork, a rear formwork and a top formwork, the front formwork is provided with a limit drag, an arc plate, a support rod and a channel steel back rib, the top of the limit drag is provided with an embedded screw, the bottom of the front formwork is provided with a fixing nail, the rear formwork is provided with a limit drag, an arc plate, a support rod and a channel steel back rib, the bottom of the front formwork is provided with a fixing nail, the top formwork is provided with a fixing rod, and a pressure plate is provided on the fixing rod.

[0008] Preferably, in step three, a groove is provided at the top of the gravity retaining wall, the bottom end of the prefabricated panel is inserted into the groove, an embedded ring and an anchor pull ring are provided at the bottom of the prefabricated panel, a steel mesh hanging bracket is provided on the prefabricated panel, soil nails are provided at the bottom of the steel mesh hanging bracket, a rotating mounting ring is provided at the top, a lifting assembly is provided at the top of the prefabricated panel, a lifting rope is provided at the top of the lifting assembly, and a rear pull ring is provided on the gravity retaining wall, and the pull ring is connected to the top of the prefabricated panel through a pull rod.

[0009] Preferably, in step 2, slag and concrete leveling are arranged in sequence from bottom to top in the gap between the gravity retaining wall and the original embankment, embedded steel is arranged in the concrete leveling, a U-shaped base is arranged on the embedded steel, a lower claw-shaped support is arranged on the U-shaped base, a connecting plate is arranged on the lower claw-shaped support, and an upper claw-shaped support is arranged on the connecting plate.

[0010] Preferably, U-shaped supports and Z-shaped supports are arranged on the steps of the original embankment, connecting strips are arranged between the Z-shaped supports, and the U-shaped supports and Z-shaped supports are used to fix the steel mesh.

[0011] Preferably, an internal support frame is arranged on the top of the original embankment, a grouting guardrail base is arranged on the prefabricated panel, grouting holes are arranged on the grouting guardrail base, a lifting assembly serves as an anchor for the prefabricated panel and the grouting guardrail base, a guardrail base is arranged on one side of the original guardrail in the middle position of the original embankment, a raised road surface is arranged on the top of the original embankment and the foam concrete, and the other side of the original embankment is a road-protecting road surface.

[0012] Preferably, in step five, a grouting guardrail base is installed on the top of the prefabricated panel on the side to be lifted, and an internal support frame is installed on the top of the original embankment on the same side. Subsequently, foam concrete is poured. After pouring to a certain height, a guardrail base is installed at the guardrail in the center of the original embankment, and foam concrete is continued to be poured to the designed elevation. At the same time, self-compacting concrete is poured into the reserved grouting holes on the grouting guardrail base to form a lifted road surface. When the lifted road surface on one side meets the requirements for traffic, the lifted road surface construction of the original embankment on the other side is carried out.

[0013] The highway reconstruction and expansion longitudinal slope lifting and alternating maintenance foam concrete lightweight embankment is obtained by any of the above methods.

[0014] The beneficial effects of the present invention are: 1) The present invention adopts foam concrete to construct widening and longitudinal slope lifting of the embankment, which reduces the deadweight of the embankment, thereby reducing the settlement of the new roadbed, and further reduces the differential settlement between the new and old roadbeds, reducing the subsequent maintenance costs.

[0015] 2) The present invention provides multiple steel mesh anchoring measures layer by layer during foam concrete construction, thereby improving the stability of the steel mesh during the foam concrete pouring process, thereby improving the construction quality of the lightweight embankment.

[0016] 3) The present invention uses a steel mesh hanging bracket, a Z-shaped support and a claw-shaped support to anchor the new and old roadbeds, thereby improving the integrity between the original roadbed and the widened longitudinal slope raised embankment.

[0017] 4) The present invention designs a standardized template for the gravity retaining wall, which ensures the construction efficiency of the gravity retaining wall, and reserves a groove at the top of the gravity retaining wall through the top template, which is convenient for positioning and installing the prefabricated panel, thereby improving the construction quality of the retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the installation of the gravity retaining wall formwork; Figure 2 It is a schematic diagram of the front formwork of the gravity retaining wall; Figure 3 It is a schematic diagram of the rear formwork of the gravity retaining wall; Figure 4 It is a schematic diagram of the top formwork of the gravity retaining wall; Figure 5 It is a schematic diagram of the internal structure of the expanded and reconstructed foam concrete lightweight embankment; Figure 6 It is a schematic diagram of the claw-shaped support of the steel mesh; Figure 7 It is a three-dimensional schematic diagram of the prefabricated panel; Figure 8 This is a schematic diagram of the original embankment anchor installation; Fig. 9 It is a schematic diagram of raising the longitudinal slope on one side and keeping the other side open; Fig.10 This is a schematic diagram of raising the longitudinal slope and maintaining access on the other side.

[0019] Description of reference numerals: 1. Gravity retaining wall 2. Front formwork 3. Support rod 4. Channel steel back rib 5. Embedded screw 6. Arc plate 7. Limiting drag 8. Fixing nail 9. Rear formwork 10. Top formwork 11. Pressing plate 12. Fixing rod 13. Bolt 14. Lower limiting plate 15. Slag 16. Concrete leveling 17. Rear pull ring 18. Soil nail 19. Upper claw support 20 Prefabricated panel 21. Fixing hook 22. Steel mesh hanging bracket 23. Lifting assembly 24. Lifting rope 2 5. U-shaped support 26. Z-shaped support 27. Original embankment 28. U-shaped base 29. Lower claw support 30. Connecting plate 31. Embedded steel 32. Anchor pull ring 33. Rotating installation ring 34. Hook ring 35. Embedded ring 36. Connecting strip 37. Grouting guardrail base 38. Grouting hole 39. Lifted road surface 40. Internal support frame 41. Guardrail base 42. Passage-proof road surface 43. Original guardrail 44. Foam concrete 45. New guardrail 46. Lifted road surface during construction. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0021] Embodiment 1 As an example, Figures 1 to 10 As shown, the construction method of the highway reconstruction and expansion longitudinal slope lifting and alternately maintaining the foam concrete lightweight embankment comprises the following steps: Step 1: Support formwork and cast gravity retaining wall 1; Step 2: Construction of embedded steel: excavate the steps of the original embankment 27, then construct slag removal 15, and then construct concrete leveling 16. During the leveling construction, the embedded steel 31 is installed.

[0022] Step 3: Prefabricated panel installation: a lifting rope 24 is set on the lifting assembly 23 at the top of the prefabricated panel 20 to lift the prefabricated panel and lift it into the reserved groove of the gravity retaining wall. Then, the rear pull ring 17 is buried, and the support between the rear pull ring and the prefabricated panel is set. Finally, the steel mesh hanging bracket is installed. During installation, the bottom of the steel mesh hanging bracket is fixed with soil nails 18, and the top is fixed with a rotating mounting ring 33. Step 4: Construction of original embankment anchors: Figure 8 As shown, the first layer of U-shaped supports is installed on the steps of the original embankment 27, and then the first layer of wire mesh is installed, and then the excess wire mesh is fixed with Z-shaped supports 26, and the wire mesh on the other side is fixed on the steel mesh hanging bracket.

[0023] Widening embankment construction: Figure 5 As shown, the first layer of foam concrete is poured, and then the claw-shaped support 19 is installed on the connecting plate, and the second U-shaped support 25 is installed on the step of the original embankment 27, and then the first layer of wire mesh is installed, and then the excess wire mesh is fixed with Z-shaped support 26, and then the next layer of foam concrete is poured until the design elevation.

[0024] Step 5: Alternate longitudinal slope lifting construction to ensure traffic flow: After the widening embankment construction on both sides is completed, one side is lifted and the other side is driven normally. First, the grouting guardrail base is installed on the top of the prefabricated panel, and the inner support frame 40 is installed on the top of the original road surface. Then, foam concrete is poured. After pouring one layer, the guardrail base 41 is installed at the original guardrail, and foam concrete is continued to be poured to the designed elevation. At the same time, self-compacting concrete is poured into the reserved grouting holes on the grouting guardrail base 37, and finally the road surface layer is constructed. After meeting the traffic requirements, the longitudinal slope lifting construction of the other lane is carried out.

[0025] Embodiment 2 As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific construction method of a lightweight foam concrete embankment with longitudinal slope lifting and alternately maintaining trafficability in highway reconstruction and expansion: In step one, if Figures 1 to 4 As shown, the template of the gravity retaining wall 1 includes a front template 2, a rear template 9 and a top template 10, the front template 2 is provided with a limit drag 7, an arc plate 6, a support rod 3 and a channel steel back rib 4, the top of the limit drag 7 is provided with an embedded screw 5, the bottom of the front template 2 is provided with a fixing nail 8, the rear template 9 is provided with a limit drag 7, an arc plate 6, a support rod 3 and a channel steel back rib 4, the bottom of the front template 2 is provided with a fixing nail 8, the top template 10 is provided with a fixing rod 12, and the fixing rod 12 is provided with a pressure plate 11.

[0026] During the construction of the gravity retaining wall: first install the front formwork 2 and the rear formwork 9, then install the support rods and soil nails 8, install the top formwork 10 on the top of the formwork, during installation, the fixing rod 12 on the top formwork 10 is placed in the arc plate 6, and then install the pressure plate 11. During installation, the bolt holes on the pressure plate 11 are aligned with the embedded screws 5, and then tightened, and finally pour concrete, maintain, and remove the formwork.

[0027] In step five, if Fig. 9 and Fig.10As shown, in step five, a grouting guardrail base 37 is installed on the top of the prefabricated panel 20 on the side to be lifted, and an inner support frame 40 is installed on the top of the original embankment 27 on the same side. Then, foam concrete is poured. After pouring to a certain height, a guardrail base 41 is installed at the guardrail in the center of the original embankment 27, and foam concrete is continued to be poured to the designed elevation. At the same time, self-compacting concrete is poured into the reserved grouting holes on the grouting guardrail base 37 to form a lifted road surface 39. When the lifted road surface 39 on one side meets the traffic requirements, the lifted road surface 39 of the original embankment 27 on the other side is constructed.

[0028] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0029] Embodiment 3 As another embodiment, this embodiment 3 proposes, based on the embodiments 1 and 2, that the highway reconstruction and expansion longitudinal slope lifting and alternating maintenance foam concrete lightweight embankment obtained by this method: It includes a gravity retaining wall 1, a prefabricated panel 20, a steel mesh hanging bracket 22, an original embankment 27, a raised road surface 39 and a road-keeping road surface; like Figure 5 As shown, steps are excavated on both sides of the original embankment 27, and a gravity retaining wall 1 is cast on the outside. Slag 15 and concrete leveling 16 are arranged in sequence from bottom to top in the gap between the gravity retaining wall 1 and the original embankment 27. An embedded steel section 31 is arranged in the concrete leveling 16, a U-shaped base 28 is arranged on the embedded steel section 31, a lower claw-shaped support 29 is arranged on the U-shaped base 28, a connecting plate 30 is arranged on the lower claw-shaped support 29, and an upper claw-shaped support 19 is arranged on the connecting plate 30.

[0030] A prefabricated panel 20 is arranged on the top of the gravity retaining wall 1, and a steel mesh hanging bracket 22 is prefabricated and installed on the prefabricated panel 20. A claw-shaped support is arranged on the concrete leveling 16, and a steel mesh is installed between the steel mesh hanging bracket 22 and the original embankment 27. Specifically, a groove is arranged on the top of the gravity retaining wall 1, and the bottom end of the prefabricated panel 20 is inserted into the groove. An embedded ring 35 and an anchor pull ring 32 are arranged at the bottom of the prefabricated panel 20. A steel mesh hanging bracket 22 is arranged on the prefabricated panel 20, and soil nails 18 are arranged at the bottom of the steel mesh hanging bracket 22. A rotating mounting ring 33 is arranged on the top. A lifting assembly 23 is arranged on the top of the prefabricated panel 20, and a lifting rope 24 is arranged on the top of the lifting assembly 23. A rear pull ring 17 is arranged on the gravity retaining wall 1, and the pull ring 17 is connected to the top of the prefabricated panel 20 through a pull rod.

[0031] It should be noted that the parts in this embodiment that are the same or similar to those in Embodiments 1 and 2 can be referenced to each other and will not be described in detail in this application.

[0032] Embodiment 4 As another embodiment, this embodiment 4 proposes, based on the embodiment 3, a more specific highway reconstruction and expansion method of longitudinal slope lifting and alternately maintaining the foamed concrete lightweight embankment: Foamed concrete 44 is poured between the original embankment 27 and the gravity retaining wall 1; When the original embankment 27 and the foamed concrete 44 on one side are cast to raise the road surface 39, the top of the original embankment 27 on the other side is a road surface for ensuring passage.

[0033] U-shaped supports 25 and Z-shaped supports 26 are arranged on the steps of the original embankment 27, and connecting strips 36 are arranged between the Z-shaped supports 26. The U-shaped supports 25 and the Z-shaped supports 26 are used to fix the steel mesh.

[0034] like Fig. 9 As shown, an internal support frame 40 is arranged on the top of the original embankment 27, a grouting guardrail base 37 is arranged on the prefabricated panel 20, a grouting hole 38 is arranged on the grouting guardrail base 37, and a hoisting assembly 23 serves as an anchor for the prefabricated panel 20 and the grouting guardrail base 37. A guardrail base 41 is arranged on one side of the original guardrail 43 in the middle position of the original embankment 27, a raised road surface 39 is arranged on the top of the original embankment 27 and the foam concrete 44, and the other side of the original embankment 27 is a road-protecting road surface.

[0035] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A construction method for a highway reconstruction and expansion with a foamed concrete lightweight embankment with longitudinal slope elevation and alternating maintenance, characterized in that: The following steps are involved: Step 1: Support formwork and cast gravity retaining wall; Step 2: dig steps on the side of the original embankment, then construct slag and concrete leveling, and install embedded steel during leveling construction; Step 3: Install the prefabricated panel on the gravity retaining wall and install the steel mesh hanging bracket; Step 4: construct steel mesh and foam concrete layer by layer between the prefabricated panel and the original embankment until the designed elevation is reached; Step 5: First, cast the raised road surface on the original embankment and foam concrete on one side, and use the other side as a road-keeping pavement.

2. The construction method of the highway reconstruction and expansion longitudinal slope lifting and alternately maintaining the foam concrete lightweight embankment according to claim 1 is characterized in that: In step one, the formwork of the gravity retaining wall includes a front formwork, a rear formwork and a top formwork, the front formwork is provided with a limit drag, an arc plate, a support rod and a channel steel back rib, the top of the limit drag is provided with an embedded screw, the bottom of the front formwork is provided with a fixing nail, the rear formwork is provided with a limit drag, an arc plate, a support rod and a channel steel back rib, the bottom of the front formwork is provided with a fixing nail, the top formwork is provided with a fixing rod, and a pressure plate is provided on the fixing rod.

3. The construction method of the highway reconstruction and expansion longitudinal slope lifting and alternately maintaining the foam concrete lightweight embankment according to claim 1 is characterized in that: In step three, a groove is provided at the top of the gravity retaining wall, the bottom end of the prefabricated panel is inserted into the groove, an embedded ring and an anchor pull ring are provided at the bottom of the prefabricated panel, a steel mesh hanging bracket is provided on the prefabricated panel, soil nails are provided at the bottom of the steel mesh hanging bracket, a rotating mounting ring is provided at the top, a lifting assembly is provided at the top of the prefabricated panel, a lifting rope is provided at the top of the lifting assembly, and a rear pull ring is provided on the gravity retaining wall, and the pull ring is connected to the top of the prefabricated panel through a pull rod.

4. The construction method of the highway reconstruction and expansion longitudinal slope lifting and alternately maintaining the foam concrete lightweight embankment according to claim 1 is characterized in that: In step two, slag and concrete leveling are arranged in sequence from bottom to top in the gap between the gravity retaining wall and the original embankment, embedded steel is arranged in the concrete leveling, a U-shaped base is arranged on the embedded steel, a lower claw-shaped support is arranged on the U-shaped base, a connecting plate is arranged on the lower claw-shaped support, and an upper claw-shaped support is arranged on the connecting plate.

5. The construction method of highway reconstruction and expansion with longitudinal slope lifting and alternately maintaining trafficability by foamed concrete lightweight embankment according to claim 1 is characterized in that: U-shaped supports and Z-shaped supports are arranged on the steps of the original embankment, connecting strips are arranged between the Z-shaped supports, and the U-shaped supports and the Z-shaped supports are used to fix the steel mesh.

6. The construction method of highway reconstruction and expansion longitudinal slope lifting and alternately maintaining trafficability of foamed concrete lightweight embankment according to claim 1 is characterized in that: An internal support frame is arranged on the top of the original embankment, a grouting guardrail base is arranged on the prefabricated panel, grouting holes are arranged on the grouting guardrail base, a hoisting assembly serves as an anchor for the prefabricated panel and the grouting guardrail base, a guardrail base is arranged on one side of the original guardrail in the middle position of the original embankment, a raised road surface is arranged on the top of the original embankment and the foam concrete, and the other side of the original embankment is a road-protecting road surface.

7. The construction method of highway reconstruction and expansion longitudinal slope lifting and alternately maintaining trafficability of foamed concrete lightweight embankment according to claim 1 is characterized in that: In step five, a grouting guardrail base is installed on the top of the precast panel on the side to be lifted, and an internal support frame is installed on the top of the original embankment on the same side. Then foam concrete is poured. After pouring to a certain height, a guardrail base is installed at the guardrail in the center of the original embankment, and foam concrete is continued to be poured to the designed elevation. At the same time, self-compacting concrete is poured into the reserved grouting holes on the grouting guardrail base to form a lifted road surface. When the lifted road surface on one side meets the requirements for traffic, the lifted road surface construction of the original embankment on the other side is carried out.

8. Highway reconstruction and expansion with longitudinal slope lifting and alternate maintenance of foamed concrete lightweight embankment, characterized in that: Obtained by the method according to any one of claims 1 to 7.

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