Construction method for vertical foam concrete light embankment in complex steep terrain

Abstract

The invention relates to a construction method of a vertical foam concrete light embankment in a complex steep terrain. The construction method comprises the following steps: installing a full-fill vertical foam concrete light embankment system, a half-fill and half-excavation light embankment system or a full-fill and full-fill light embankment system; the half-filling and half-digging backer inner side slope rapid temporary supporting system is installed, firstly, anti-sliding steel pipe piles are constructed in a concrete retaining wall, then a light steel net frame is constructed, a slope toe is hardened, and a mountain body is connected through detachable pre-stressed anchor rods. The full-fill vertical foam concrete light embankment system has the beneficial effects that the full-fill vertical foam concrete light embankment system is convenient to construct, simple to operate and reasonable in stress form; according to the full-excavation and full-filling type light embankment system, technical innovation is conducted on a step interface combined drainage method, the drainage construction efficiency is improved, and the construction quality is guaranteed; the slope is temporarily supported through the light steel net rack and the detachable pre-stressed anchor rods, potential safety hazards of construction are reduced, and construction safety is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of highway bridges, and in particular relates to a method for constructing an upright foam concrete lightweight embankment on complex and steep terrain. Background Art

[0002] Foamed lightweight soil, also known as bubble mixed lightweight soil and foamed concrete, is prepared by physical methods using a foaming agent to form a foam group, which is mixed with cement, water, admixtures and additives to form a cement-based slurry, which is mixed and stirred in a certain proportion and cast into shape. The lightweight material obtained after hardening contains a large number of bubbles inside. It has the characteristics of lightness, adjustable density and strength, high fluidity, uprightness and convenient construction. It is used to replace fill for the purpose of reducing load or soil pressure. It can be widely used in highway and railway engineering fields such as abutment filling, road expansion, filling of steep sections in mountainous areas, replacement of roadbed at old bridgeheads, etc. It can also be used for covering and reducing loads of underground large-span structures, filling of voids and narrow spaces, and has unique technical and economic advantages.

[0003] However, the current construction of lightweight foam concrete embankments faces many problems. On the one hand, the retaining wall is a structure used to support the roadbed fill or hillside soil to prevent its deformation and instability. The retaining wall at the embankment slope is called the embankment retaining wall. When the embankment has defects such as insufficient bearing capacity of the retaining wall and poor overall stability of the embankment, it is necessary to reinforce the embankment retaining wall to avoid major disasters. However, the existing retaining wall reinforcement methods have some disadvantages. On the other hand, the manpower and cost of greening the rock slopes after open-pit mines or engineering excavation are quite high. Moreover, no matter what greening technology or means are used, the problem of sufficient and continuous water supply required for greening must be solved. Judging from many current rock slope greening cases, it is precisely because of the lack of continuous water supply that various plants wither and the greening plan ultimately fails.

[0004] In view of the construction of vertical foam concrete lightweight embankments in complex and steep terrain, it is urgent to propose a construction method that can improve construction efficiency while ensuring project quality and safety. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for constructing an upright foam concrete lightweight embankment on complex and steep terrain.

[0006] This complex and steep vertical foam concrete lightweight embankment includes a full-fill vertical foam concrete lightweight embankment system, a half-fill and half-excavation lightweight embankment system or a full-excavation and full-fill lightweight embankment system. The three embankment systems all include a superstructure, a retaining and strengthening structure and a foundation structure. The foundation structure and the soil below the road surface line are anchored, the retaining and strengthening structures are arranged on both sides of the embankment, and the superstructure is arranged on the top of the embankment; a concrete counterweight retaining wall is arranged at the bottom of the downslope side of the half-fill and half-excavation lightweight embankment system, and a step surface is arranged on the side facing upslope of the full-excavation and full-fill lightweight embankment system; It also includes a quick temporary support system for the inner side slope of a half-filled and half-excavated mountain and a quick regreening system with a rear-mounted storage and drainage system on the outer side of the vertical wall panel combined with a cantilevered planting platform. The quick temporary support system for the inner side slope of a half-filled and half-excavated mountain is located on the side of the mountain.

[0007] Preferably, the foundation structure includes base anchor rods, crushed stone cushion layer, concrete base plate, impermeable geomembrane and PVC drainage pipe; the retaining and reinforcing structure includes angle steel pillars, prefabricated baffles and steel mesh; the superstructure includes a leveling layer, roadbed pavement and anti-collision guardrail.

[0008] Preferably, the foundation structure of the semi-filled and semi-excavated lightweight embankment system includes a concrete base plate, base anchor rods and a gravel cushion layer, and a concrete counterweight retaining wall is provided on the side of the gravel cushion layer; a multi-layer steel mesh is arranged in the semi-filled and semi-excavated lightweight embankment system, prefabricated baffles and angle steel pillars are arranged on both sides of the semi-filled and semi-excavated lightweight embankment system, and a pile-plate drainage retaining wall, a drainage ditch and a waterproof membrane are provided on the uphill part of the road surface line.

[0009] Preferably, the full-cut and full-fill lightweight embankment system includes a concrete base plate, base anchor rods and a crushed stone cushion layer. The side where the full-cut and full-fill lightweight embankment system is connected to the road surface line is a step surface. Multiple layers of steel mesh are arranged in the full-cut and full-fill lightweight embankment system. Prefabricated baffles and angle steel pillars are arranged on both sides of the full-cut and full-fill lightweight embankment system. A longitudinal open drainage ditch is arranged above the road surface line, a step surface anti-seepage membrane is arranged on the step surface below the road surface line, and a longitudinal drainage blind ditch and a transverse drainage pipe are arranged along the step surface below the step surface anti-seepage membrane.

[0010] Preferably, the rapid temporary support system for the inner side slope of the half-fill and half-excavated mountain includes a support system and an anti-slip system, wherein the support system includes slope foot hardening, a light steel grid, a grid support, a steel casing and a detachable prestressed anchor rod; the anti-slip system includes anti-slip steel pipe piles, which are arranged in reinforced concrete beams and concrete retaining walls.

[0011] Preferably, a rapid greening system with a rear-mounted storage and drainage system on the outer side of a vertical wall panel combined with a cantilevered planting platform is provided, comprising a vertical wall panel, a recyclable surface layer, a retaining bag, a drainage pipe, a filter layer, a sand and gravel cushion layer, an upper green vegetation planting area and a water collection channel, wherein the water collection channel is provided with a sealed channel cover and an open channel cover.

[0012] The construction method of this complex and steep terrain vertical foam concrete lightweight embankment includes the following construction steps: S1. Install a full-fill vertical foam concrete lightweight embankment system, a half-fill and half-excavation lightweight embankment system, or a full-excavation and full-fill lightweight embankment system; S2. Install the quick temporary support system for the inner side slope of the half-fill and half-cut mountain. First, install anti-slip steel pipe piles in the concrete retaining wall, then install light steel grids and harden the slope foot, and connect the mountain with detachable prestressed anchor rods; S3. Install a rapid greening system with a rear-mounted water storage and drainage system on the outside of a vertical wall panel combined with a cantilevered planting platform, including pre-installing sealed channel covers and open channel covers on the upper part of the water collection channel, and installing drainage pipes and filter layers on the lower part.

[0013] Preferably, in step S2, the detachable prestressed anchor is anchored in the mountain. First, a reinforced concrete beam is constructed on the top of the concrete retaining wall, and anti-slip steel pipe piles are constructed in the reinforced concrete beam and the concrete retaining wall. Then, a light steel grid and grid support are constructed on the top of the concrete retaining wall, and the slope foot is hardened. Finally, the reinforced concrete beam is connected to the detachable prestressed anchor through a steel casing, and the other side of the detachable prestressed anchor is connected to the mountain.

[0014] Preferably, in step S3, a gravel cushion layer is laid at the bottom of the rapid greening system of the rear-mounted storage and drainage combined with the cantilevered planting platform outside the upright wall panels. After the drainage pipe and the filter layer are constructed, an upper green vegetation planting area is constructed on the gravel cushion layer. Upright wall panels, recyclable surface protective layers and retaining bags are provided on both sides of the upper green vegetation planting area.

[0015] The beneficial effects of the present invention are: 1) The present invention proposes a full-fill upright foam concrete lightweight embankment system, which is convenient to construct, simple to operate, has a reasonable force form, and has good technical and economic benefits.

[0016] 2) The present invention proposes a fully cut and fully filled lightweight embankment system, makes technical innovations on the step interface, and arranges drainage pipes to form a combined drainage method, thereby improving the drainage construction efficiency and ensuring the construction quality.

[0017] 3) The present invention proposes a quick temporary support system for the inner side slope of a half-filled and half-excavated mountain, which temporarily supports the slope by using a light steel grid and detachable prestressed anchor rods, thereby reducing safety hazards during construction and ensuring construction safety.

[0018] 4) The present invention proposes a rapid greening system with a rear-mounted storage and drainage system on the outer side of a vertical wall panel combined with a cantilevered planting platform, which can automatically collect and dredge rainwater to a certain extent, and supply water to the green planting area, effectively improving the utilization rate of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the system structure of a full-fill vertical foam concrete lightweight embankment; Figure 2 It is a schematic diagram of the system structure of a semi-filled and semi-excavated lightweight embankment; Figure 3 This is a schematic diagram of the system structure of a full cut and full fill lightweight embankment; Figure 4 It is a schematic diagram of the system structure of the half-fill and half-cut quick temporary support for the inner side slope of the mountain; Figure 5 It is a schematic diagram of the installation structure of a detachable prestressed anchor rod; Figure 6 It is a plan view of the rapid greening system of the rear-mounted storage and drainage system on the outside of the upright wainscot combined with the cantilevered planting platform; Figure 7 It is a cross-sectional diagram of a rapid regreening system with rear-mounted storage and drainage on the outside of a vertical wall panel combined with a cantilevered planting platform.

[0020] Explanation of reference numerals: 1 base anchor rod, 2 crushed stone cushion layer, 3 concrete bottom plate, 4 PVC drainage pipe, 5 anti-seepage geomembrane, 6 steel mesh, 7 prefabricated baffle plate, 8 angle steel pillar, 9 anti-collision guardrail, 10 roadbed and pavement, 11 leveling layer, 12 concrete counterweight retaining wall, 13 pavement line, 14 drainage ditch, 15 waterproof membrane, 16 pile-plate drainage retaining wall, 17 longitudinal drainage open ditch, 18 longitudinal drainage blind ditch, 19 transverse drainage pipe, 20 step surface, 21 step surface anti-seepage membrane, 22 mountain, 23 detachable prestressed anchor rod, 24 slope foot hardening, 25 light steel grid, 26 reinforced concrete beam, 27 anti-slip steel pipe pile, 28 concrete retaining wall, 29 steel casing, 30 grid support, 31 upright wainscot, 32 sealed channel cover, 33 Open channel cover, 34 retaining bag, 35 recyclable surface layer, 36 filter layer, 37 drainage pipe, 38 water collection channel, 39 gravel cushion layer, 40 upper green vegetation planting area. DETAILED DESCRIPTION

[0021] 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.

[0022] Embodiment 1 As an example, Figures 1 to 7As shown, a vertical foam concrete lightweight embankment for complex steep terrain is provided, wherein the embankment includes a full-fill vertical foam concrete lightweight embankment system, a half-fill and half-excavation lightweight embankment system or a full-excavation and full-fill lightweight embankment system.

[0023] All three types of embankments include a superstructure, a retaining and strengthening structure and a foundation structure. The foundation structure is anchored to the soil below the road surface line 13, the retaining and strengthening structure is arranged on both sides of the embankment, and the superstructure is arranged on the top of the embankment.

[0024] like Figure 2 As shown in FIG. 1 , a concrete counterweight retaining wall 12 is provided at the bottom of the downslope side of the semi-filled and semi-excavated lightweight embankment system. Figure 3 As shown, the side of the full cut and full fill lightweight embankment system facing uphill is provided with a step surface 20.

[0025] like Figures 1 to 3 As shown, the foundation structure includes a base anchor 1, a crushed stone cushion layer 2, a concrete base plate 3, an anti-seepage geomembrane 5 and a PVC drainage pipe 4; the retaining and reinforcing structure includes an angle steel support 8, a prefabricated baffle 7 and a steel mesh 6; the superstructure includes a leveling layer 11, a roadbed pavement 10 and an anti-collision guardrail 9.

[0026] It also includes a quick temporary support system for the inner side slope of a half-filled and half-excavated mountain and a quick regreening system for the outer rear storage and drainage of vertical wall panels combined with a cantilevered planting platform. The quick temporary support system for the inner side slope of a half-filled and half-excavated mountain is located on the side of the mountain 22.

[0027] like Figure 6 and Figure 7 As shown, the rapid greening system of the rear-mounted water storage and drainage on the outer side of the upright wall panel combined with the cantilevered planting platform includes an upright wall panel 31, a recyclable surface layer 35, a retaining bag 34, a drainage pipe 37, a filter layer 36, a sand and gravel cushion layer 39, an upper green vegetation planting area 40 and a water collection channel 38, on which a sealed channel cover 32 and an open channel cover 33 are provided.

[0028] Embodiment 2 As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific vertical foam concrete lightweight embankment for complex steep terrain: like Figure 2 As shown, the foundation structure of the semi-filled and semi-excavated lightweight embankment system includes a concrete base plate 3, a base anchor 1 and a crushed stone cushion layer 2, and a concrete counterweight retaining wall 12 is provided on the side of the crushed stone cushion layer 2; a multi-layer steel mesh 6 is arranged in the semi-filled and semi-excavated lightweight embankment system, and prefabricated baffles 7 and angle steel pillars 8 are arranged on both sides of the semi-filled and semi-excavated lightweight embankment system, which play a role in enhancing the overall force-bearing performance.

[0029] A pile-sheet drainage retaining wall 16 , a drainage ditch 14 and a waterproof membrane 15 are provided on the upslope of the road surface line 13 .

[0030] like Figure 3 As shown, the full-cut and full-fill lightweight embankment system includes a concrete base plate 3, a base anchor rod 1 and a crushed stone cushion layer 2. The side where the full-cut and full-fill lightweight embankment system is connected to the road surface line 13 is a step surface 20. A multi-layer steel mesh 6 is arranged in the full-cut and full-fill lightweight embankment system. Prefabricated baffles 7 and angle steel pillars 8 are arranged on both sides of the full-cut and full-fill lightweight embankment system to enhance the overall force performance. A longitudinal open drainage ditch 17 is arranged above the road surface line 13, and a step surface anti-seepage membrane 21 is arranged on the step surface 20 below the road surface line 13. A longitudinal drainage blind ditch 18 and a transverse drainage pipe 19 are arranged along the step surface 20 below the step surface anti-seepage membrane 21 to play a role of combined drainage.

[0031] like Figure 4 and Figure 5 As shown, the quick temporary support system for the inner side slope of the half-filled and half-excavated mountain includes a support system and an anti-slip system. The support system includes a slope foot hardening 24, a light steel grid 25, a grid support 30, a steel casing 29 and a detachable prestressed anchor rod 23; the anti-slip system includes anti-slip steel pipe piles 27, and the anti-slip steel pipe piles 27 are arranged in reinforced concrete beams 26 and concrete retaining walls 28.

[0032] 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.

[0033] Embodiment 3 As another embodiment, this embodiment 3 is proposed on the basis of embodiments 1 and 2, and the construction method of the vertical foam concrete lightweight embankment on complex steep terrain includes the following steps: S1. Installing a full-fill upright foam concrete lightweight embankment system, including pre-installing base anchor rods 1 and anti-seepage geomembrane 5 on a crushed stone cushion layer 2 and a concrete bottom plate 3; then installing angle steel pillars 8, prefabricated baffles 7, several layers of steel mesh 6 and PVC drainage pipes 4; and finally installing a roadbed pavement 10 and an anti-collision guardrail 9 on a leveling layer 11.

[0034] The installation of the semi-filled and semi-excavated lightweight embankment system includes pre-installing the base anchor rod 1 on the gravel cushion 2 and the concrete bottom plate 3, and setting up the concrete counterweight retaining wall 12 next to the gravel cushion 2. Then, the angle steel pillar 8, the prefabricated retaining plate 7, and several layers of steel mesh 6 are installed to improve the integrity and crack resistance of the lightweight embankment. Finally, the drainage ditch 14 and the waterproof membrane 15 are installed on the upslope of the road surface line 13, and the plate-mounted drainage retaining wall 16 is installed on the left side of the drainage ditch 14.

[0035] The installation of the full cut and full fill lightweight embankment system includes pre-installing the base anchor rod 1 on the gravel cushion 2 and the concrete bottom plate 3. Then the angle steel pillar 8, the prefabricated baffle 7, and several layers of steel mesh 6 are installed to improve the integrity and crack resistance of the lightweight embankment. Then the longitudinal drainage ditch 17 is installed on the road surface line 13, and the step surface anti-seepage membrane 21 is pre-laid on the step surface 20, and the longitudinal drainage blind ditch 18 and the transverse drainage pipe 19 are installed on the lower side of the step surface, so as to achieve the effect of multiple combined drainage.

[0036] S2. Install a quick temporary support system for the inner side slope of the half-filled and half-excavated mountain. First, anti-slip steel pipe piles 27 are installed in the reinforced concrete beam 26 and the concrete retaining wall 28. Then, a light steel grid 25 and a grid support 30 are installed and the slope foot is hardened 24. Finally, the reinforced concrete beam 26 is connected to the detachable prestressed anchor rod 23 through a steel casing 29. The other side of the detachable prestressed anchor rod 23 is connected to the mountain 22.

[0037] S3, installation of the vertical wainscot outer rear-mounted storage and drainage combined with cantilevered planting platform rapid greening system, including pre-installing sealed channel cover 32 and open channel cover 33 on the upper part of the water collection channel 38, and installing drainage pipe 37 and filter layer 36 on the lower part. Then, an upper green vegetation planting area 40 is constructed on the sand and gravel cushion layer 39, and vertical wainscot 31, recyclable surface layer 35 and retaining bag 34 are arranged on both sides of the upper green vegetation planting area 40.

[0038] 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.

[0039] 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 vertical foam concrete lightweight embankment for complex and steep terrain, characterized in that: The embankment includes a full-fill vertical foam concrete lightweight embankment system, a half-fill and half-cut lightweight embankment system or a full-cut and full-fill lightweight embankment system. All three embankment systems include a superstructure, a retaining and strengthening structure and a foundation structure. The foundation structure and the soil below the road surface line are anchored, the retaining and strengthening structures are arranged on both sides of the embankment, and the superstructure is arranged on the top of the embankment. The bottom of the downslope side of the half-fill and half-cut lightweight embankment system is provided with a concrete counterweight retaining wall, and the side of the full-cut and full-fill lightweight embankment system facing uphill is provided with a step surface; It also includes a quick temporary support system for the inner side slope of a half-filled and half-excavated mountain and a quick regreening system with a rear-mounted storage and drainage system on the outer side of the vertical wall panel combined with a cantilevered planting platform. The quick temporary support system for the inner side slope of a half-filled and half-excavated mountain is located on the side of the mountain.

2. The complex steep terrain vertical foam concrete lightweight embankment according to claim 1 is characterized in that: The foundation structure includes base anchor rods, crushed stone cushion layer, concrete base plate, anti-seepage geomembrane and PVC drainage pipe; the retaining and strengthening structure includes angle steel pillars, prefabricated baffles and steel mesh; the superstructure includes a leveling layer, roadbed pavement and anti-collision guardrail.

3. The complex steep terrain vertical foam concrete lightweight embankment according to claim 1 is characterized in that: The foundation structure of the semi-fill and semi-excavated lightweight embankment system includes a concrete base plate, base anchor rods and a crushed stone cushion layer, and a concrete counterweight retaining wall is arranged on the side of the crushed stone cushion layer; a multi-layer steel mesh is arranged in the semi-fill and semi-excavated lightweight embankment system, and prefabricated baffles and angle steel pillars are arranged on both sides of the semi-fill and semi-excavated lightweight embankment system, and pile-plate drainage retaining walls, drainage ditches and waterproof membranes are arranged on the uphill part of the road surface line.

4. The complex steep terrain vertical foam concrete lightweight embankment according to claim 1 is characterized in that: The full-cut and full-fill lightweight embankment system includes a concrete base plate, base anchor rods and a crushed stone cushion layer. The side where the full-cut and full-fill lightweight embankment system is connected to the road surface line is a step surface. Multiple layers of steel mesh are arranged in the full-cut and full-fill lightweight embankment system. Prefabricated baffles and angle steel pillars are arranged on both sides of the full-cut and full-fill lightweight embankment system. A longitudinal open drainage ditch is arranged above the road surface line, a step surface anti-seepage membrane is arranged on the step surface below the road surface line, and a longitudinal drainage blind ditch and a transverse drainage pipe are arranged along the step surface below the step surface anti-seepage membrane.

5. The complex steep terrain vertical foam concrete lightweight embankment according to claim 1 is characterized in that: The quick temporary support system for the inner side slope of the half-fill and half-excavated mountain includes a support system and an anti-slip system. The support system includes slope foot hardening, a light steel grid, a grid support, a steel casing and a detachable prestressed anchor rod; the anti-slip system includes anti-slip steel pipe piles, which are arranged in reinforced concrete beams and concrete retaining walls.

6. The complex steep terrain vertical foam concrete lightweight embankment according to claim 1, characterized in that: The rapid greening system of the rear-mounted storage and drainage on the outer side of the upright wall panel combined with the cantilevered planting platform includes an upright wall panel, a recyclable surface layer, a retaining bag, a drainage pipe, a filter layer, a sand and gravel cushion layer, an upper green vegetation planting area and a water collection channel, and the water collection channel is provided with a sealed channel cover and an open channel cover.

7. The construction method of a vertical foamed concrete lightweight embankment on a complex steep terrain as claimed in claim 1, characterized in that: The construction steps include: S1. Install a full-fill vertical foam concrete lightweight embankment system, a half-fill and half-excavation lightweight embankment system, or a full-excavation and full-fill lightweight embankment system; S2. Install the quick temporary support system for the inner side slope of the half-fill and half-cut mountain. First, install anti-slip steel pipe piles in the concrete retaining wall, then install light steel grids and harden the slope foot, and connect the mountain with detachable prestressed anchor rods; S3. Install a rapid greening system with a rear-mounted water storage and drainage system on the outside of a vertical wall panel combined with a cantilevered planting platform, including pre-installing sealed channel covers and open channel covers on the upper part of the water collection channel, and installing drainage pipes and filter layers on the lower part.

8. The construction method of a vertical foamed concrete lightweight embankment on a complex steep terrain according to claim 7, characterized in that: In step S2, the detachable prestressed anchor rod is anchored in the mountain. First, a reinforced concrete beam is constructed on the top of the concrete retaining wall, and anti-slip steel pipe piles are constructed in the reinforced concrete beam and the concrete retaining wall. Then, a light steel grid and grid support are constructed on the top of the concrete retaining wall, and the slope foot is hardened. Finally, the reinforced concrete beam is connected to the detachable prestressed anchor rod through a steel casing, and the other side of the detachable prestressed anchor rod is connected to the mountain.

9. The construction method of a vertical foamed concrete lightweight embankment on a complex steep terrain according to claim 7, characterized in that: In step S3, a gravel cushion layer is laid at the bottom of the rapid greening system of the rear-mounted storage and drainage combined with the cantilevered planting platform outside the upright wall panel. After the drainage pipe and the filter layer are constructed, the upper green vegetation planting area is constructed on the gravel cushion layer. Upright wall panels, recyclable surface protective layers and retaining bags are provided on both sides of the upper green vegetation planting area.

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