CN111411637A - High and steep terrain foam concrete light embankment structure and construction method - Google Patents

Abstract

The invention relates to a high and steep topography foam concrete light embankment structure, which comprises prestressed steel bundles, anti-sliding anchors, anchor piles, anti-overturning piles, stone concrete guard feet, a prefabricated reinforced concrete retaining wall, prestressed anchor cables, prefabricated guardrails and an integral reinforcing mesh; the transverse slope and the longitudinal slope of the high and steep terrain are provided with reverse-inclined steps, anti-skid anchors are arranged at the steps, and the surface of the steps is provided with shallow grouting reinforcement bodies; a foam concrete embankment is poured above the steps, and is provided with parting joints in the transverse direction and the longitudinal direction, and the parting joints are arranged in the middle of each step; the parting steel plate is filled in the parting. The invention has the beneficial effects that: high steep topography transverse slope and longitudinal slope set up the back dip step, resist the transverse slope through the step and slide and the longitudinal slope problem of sliding, step department sets up anti-skidding anchor, improves the sliding resistance of contact surface, and step department earth's surface sets up shallow grouting reinforcement body, improves shallow earth's surface intensity through the slip casting, prevents to slide along the shallow layer of earth's surface to improve anti-skidding anchor's anchoring power.

Description

Foam concrete lightweight embankment structure and construction method for high and steep terrain

technical field

The invention relates to an embankment structure, in particular to a high-steep terrain foam concrete lightweight embankment structure and a construction method.

Background technique

The contact surface between the foam concrete and the surface of the foam concrete embankment with high and steep terrain has a slippage problem due to the steep terrain; the longitudinal and transverse slopes of the high and steep terrain are steep, and the thickness of the foam concrete embankment in the lateral and longitudinal directions is uneven, resulting in uneven foundation. The settlement problem is prominent. In addition, due to the light weight of foamed concrete, high embankment and steep terrain, the overall overturning of the embankment is prone to occur. The above-mentioned problems cannot be solved in the existing patented technology of foam concrete embankment.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a high-steep terrain foam concrete lightweight embankment structure that is suitable for high and steep terrain, can adapt to uneven settlement, prevent the interface between the embankment and the surface from slipping, and has strong anti-overturning ability. and construction methods.

This high and steep terrain foam concrete lightweight embankment structure includes prestressed steel bundles, anti-sliding anchors, anchor piles, anti-overturning piles, rubble concrete foot guards, prefabricated reinforced concrete retaining walls, prestressed anchor cables, prefabricated guardrails and integral high and steep terrain cross and longitudinal slopes are set with inverted steps, anti-sliding anchors are set at the steps, and shallow grouting reinforcements are set on the surface of the steps; foam concrete embankments are poured above the steps, and the foam concrete embankment is horizontal and vertical. Split joints are set, and the split joints are set in the middle of the steps at all levels; the split joints are filled with split steel plates, and dowel rods are set between the adjacent blocks of the foam concrete embankment divided by the split zone; foam The concrete embankment is provided with a multi-level prefabricated reinforced concrete retaining wall on one side of the slope bottom of the high and steep terrain, the outer side of the prefabricated reinforced concrete retaining wall is provided with buttresses, and the bottom of the first-level prefabricated reinforced concrete retaining wall is provided with rubble concrete foot guards and rubble concrete guards. Anti-overturning piles are arranged at the bottom of the feet, and the pile tops of the anti-overturning piles are embedded in the rubble concrete and connected with the retaining wall bottom plate of the first-stage prefabricated reinforced concrete retaining wall through prestressed anchor cables; the wall of the first-stage prefabricated reinforced concrete retaining wall The top of the body and the bottom plate of the second-level prefabricated reinforced concrete retaining wall are connected by prestressed anchor cables, and the wall body of the prefabricated reinforced concrete retaining wall is provided with prestressed steel bundles that pass through the foam concrete embankment and are fixed on the anchor piles; the foam concrete embankment is fixed on the anchor piles; Deformed steel plates are laid at the joints at the top, and the deformed steel plates are fixed on the foam concrete by fixing nails. The top of the foam concrete embankment is laid with an integral steel mesh, the pavement structure layer is laid above the integral steel mesh, and the top of the retaining wall at the edge of the foam concrete embankment is installed. Prefabricated guardrails.

Preferably, the grouting solid body is arranged in a depth range of 2-3m along the surface, and its cross section and longitudinal section are stepped.

Preferably: the seamed steel plate includes a vertical plate, a seamed steel plate bottom plate and a triangular rib, the vertical plate is a long strip structure, the bottom of the vertical plate is provided with an elongated seamed steel plate bottom plate, and the two sides of the vertical plate are provided with triangular rib plates. Anchor holes are reserved on the bottom plate of the rib and seamed steel plate, one side of the vertical plate is smeared with lubricating oil, and the other side is pasted with a layer of asphalt fir board.

Preferably, a lower-layer steel mesh, a middle-layer steel mesh and an upper-layer steel mesh are arranged in the foam concrete embankment, and the steel mesh is inserted into the foam concrete through U-shaped steel bars for fixing.

Preferably: the prefabricated reinforced concrete retaining wall is a buttress type retaining wall, the buttress is arranged on the outer side of the prefabricated reinforced concrete retaining wall, prestressed anchor cable holes are preset on the bottom plate of the retaining wall, and prestressed anchors are pre-buried on the top of the wall. Sow.

Preferably, the anti-overturning piles and the anchor piles are all made of concrete-filled steel tubular piles, and the tops of the anti-overturning piles are pre-embedded with prestressed anchor cables.

Preferably, one end of the dowel rod is fixed in the straight threaded sleeve, the other end extends into the sleeve, the straight threaded sleeve is directly welded on the seamed steel plate, and the sleeve is fixed on the seamed steel plate through the support bars.

Preferably, the deformed steel plate has a strip-like structure, the deformed steel plate is composed of flanges and protrusions, the cross section is butterfly-shaped, and the protrusions are arranged at the seams.

As a preference: anchor holes are reserved on the bottom plate of the prefabricated guardrail.

Preferably, a graded crushed stone cushion and a cast-in-place concrete slab are laid on the inner side of the rubble concrete foot guard.

As a preference: the anchors are made of threaded steel bars.

Preferably, the inverted step is that the surface of the step is inclined to the inner side of the foundation at a certain angle; the surface of the inverted step is covered with permeable geotextile.

The construction method of the foam concrete lightweight embankment structure for high and steep terrain includes the following construction steps:

1) Excavate horizontal steps and vertical steps on the surface of the steep slope terrain, and excavate the steps into an inverted shape, that is, the step surface is inclined to the inside of the foundation at a certain angle;

2) Drill grouting holes evenly on the steps, insert a grouting pipe, and inject cement slurry through a grouting pump to reinforce the shallow surface of the step surface by grouting;

3) Construction of anchor piles and anti-overturning piles: Drill holes at the positions of anchor piles and anti-overturning piles, insert steel pipes, put steel cages in the steel pipes and pour self-compacting concrete, and pre-embed prestressed anchor cables on the top of the anti-overturning piles ;

4) Prefabricated prefabricated reinforced concrete retaining wall with buttresses on site, pre-stressed anchor cable holes are reserved on the bottom plate of the retaining wall, and pre-stressed anchor cables are pre-embedded at the top of the wall;

5) Pour rubble concrete foot guards on the top of the anti-overturning piles, lay a graded gravel cushion and a cast-in-place concrete slab on the first step inside the rubble concrete foot guards, and hoist the first-level prefabricated steel bars on the top of the rubble concrete foot guards Concrete retaining wall, the prestressed anchor cables reserved by the anti-overturning piles pass through the retaining wall bottom plate of the first-level prefabricated reinforced concrete retaining wall, apply prestress and anchor on the retaining wall bottom plate of the first-level prefabricated reinforced concrete retaining wall with anchors ;

6) Weld the seam steel bottom plate at the bottom of the vertical plate, weld the triangular rib plate on both sides of the vertical plate, drill the dowel rod hole on the vertical plate, weld the straight thread sleeve on one side of the dowel rod hole, and install the dowel rod One end is screwed into the straight threaded sleeve, the other end is covered with a sleeve, the bottom of the sleeve is welded to the vertical plate through the support bar, and the prestressed steel beam hole is drilled at the position where the prestressed steel bundle passes through the vertical plate to form a component. seam steel plate;

7) Place the split steel plate along the split and fix it with anchors, apply butter on one side of the vertical plate, and paste a layer of asphalt fir board on the other side;

8) Install prestressed steel bundles on the wall of the first-level prefabricated reinforced concrete retaining wall, pass the prestressed steel bundles through the prestressed steel bundle holes on the split steel plate, and then fix them on the anchor piles and apply prestressing;

9) Pour foam concrete in the block enclosed by the split steel plate and the first-level prefabricated reinforced concrete retaining wall. When pouring the foam concrete, lay the steel mesh at the design elevation of the steel mesh and fix it with U-shaped steel bars;

10) Hoist the second-level prefabricated reinforced concrete retaining wall on top of the first-level prefabricated reinforced concrete retaining wall, and pass the prestressed anchor cable at the top of the first-level prefabricated reinforced concrete retaining wall through the retaining wall of the second-level prefabricated reinforced concrete retaining wall base plate, anchored and prestressed;

11) Set up jointed steel plates at the joints of the foam concrete and fix them with anchors, install prestressed steel bundles on the wall of the second-level prefabricated reinforced concrete retaining wall, and fix the prestressed steel bundles through the jointed steel plates on the anchor piles and apply prestress;

12) Pour foam concrete in the block enclosed by the split steel plate and the second-level prefabricated reinforced concrete retaining wall. When pouring the foam concrete, lay the steel mesh at the design elevation of the steel mesh and fix it with U-shaped steel bars;

13) Repeat step 10) to step 12) until reaching the design foam concrete pouring elevation;

14) The deformed steel plate is embedded in the seam at the top of the foam concrete embankment before the foam concrete is hardened, the protrusion of the deformed steel plate is embedded in the seam, and the two flanges are embedded in the foam concrete and fixed by fixing nails;

15) Lay an integral steel mesh on the top of the foam concrete embankment, and the integral steel mesh is fixed in the foam concrete by anchors;

16) Lay anti-seepage geotextiles on the other side of the stepped slope opposite to the prefabricated reinforced concrete retaining wall and fill with edging soil;

17) Install the prefabricated guardrail, and the bottom plate of the prefabricated guardrail is fixed on the top of the prefabricated reinforced concrete retaining wall through the prestressed anchor cables reserved at the top of the prefabricated reinforced concrete retaining wall;

18) Construction of pavement structure layer.

The beneficial effects of the present invention are:

1. Set upside-down steps on the cross and longitudinal slopes of high and steep terrain, and use the steps to resist the slippage of the lateral and longitudinal slopes. Anti-sliding anchors are set at the steps to improve the anti-sliding force of the contact surface. The surface at the steps is shallow Layer grouting to add solids, through grouting to improve the strength of the shallow surface, to prevent slippage along the shallow surface, and to improve the anchoring force of the anti-sliding anchor. Through these measures, the skid resistance of foamed concrete in high and steep terrain can be significantly improved.

2. The foam concrete embankment is provided with slits both horizontally and vertically. The slits are set in the middle of the steps at all levels. The slits are filled with steel plates, and the two sides of the slit steel plates are provided with triangular ribs. The high embankment is cut into blocks to adapt to the uneven settlement of high and steep foundations. The seamed steel plate with triangular rib can be used as the formwork of the block during pouring, and at the same time, the blocks can be organically combined together. Dowel rods are arranged between each adjacent block of the foam concrete high embankment divided by the seam area. One end of the dowel rod is fixed and the other end is free, which can make the force transfer between the blocks without restricting the settlement, and can adapt to H Tr. The deformed steel plate laid at the joints on the top of the high and steep embankment is a butterfly-shaped structure, the bulge is set in the split, and the two flanges are fixed in the blocks on both sides, which can adapt to the deformation of the split without damage. The mesh, through the deformed steel plate and the integral steel mesh, prevents the deformation of the joints from being reflected on the road surface, resulting in reflection cracks on the road surface.

3. A multi-level prefabricated reinforced concrete retaining wall is set on the side of the slope bottom of the high and steep terrain for the foam concrete embankment, the outer side of the prefabricated reinforced concrete retaining wall is provided with a buttress, and the bottom of the lowest prefabricated reinforced concrete retaining wall is provided with rubble concrete foot guards. There are anti-overturning piles at the bottom of the scree concrete foot guards. The buttress-type reinforced concrete retaining wall has higher anti-overturning capacity. At the same time, concrete-filled steel tube piles are set to resist overturning. The panel of the prefabricated reinforced concrete retaining wall can be used as a formwork for pouring foam concrete. In addition, pre-stressed steel bundles are set on the wall surface of the prefabricated reinforced concrete retaining wall to pass through the foam concrete embankment to be fixed on the anchor piles, which can transfer the overturning force to the anchor piles through the prestressed steel bundles and have a stronger anti-overturning ability.

4. The present invention improves the anti-slip ability, the ability to adapt to uneven settlement and the anti-overturning ability of the high-steep terrain foam concrete high retaining wall.

5. High and steep embankments have high requirements for guardrail protection. Fixing prefabricated reinforced concrete guardrails by prestressed anchor cables can improve the safety of guardrails.

Description of drawings

Figure 1 is a schematic cross-sectional view of the embankment structure;

Figure 2 is a schematic diagram of the retaining wall, anti-overturning piles, anchor piles, and prestressed steel bundle systems;

Figure 3 is a schematic diagram of a prefabricated reinforced concrete retaining wall structure;

Figure 4 is a schematic diagram of a slit steel plate and its subsidiary structure;

Figure 5 is a schematic cross-sectional view of a deformed steel plate.

Description of reference numerals: Asphalt pavement 1, deformed steel plate 2, concrete base 3, anti-seepage geotextile 4, foam concrete 5, prestressed steel bundle 6, edging soil 7, permeable geotextile 8, anti-slip anchor 9, anchor Pile 10, cast-in-place concrete slab 11, graded gravel cushion 12, anti-overturning pile 13, rubble concrete foot guard 14, lower reinforcement mesh 15, prefabricated reinforced concrete retaining wall 16, anchor 17, prestressed anchor cable 18, Middle reinforcement mesh 19, upper reinforcement mesh 20, prefabricated guardrail 21, integral reinforcement mesh 22, flange 23, protrusion 24, fixing nail 25, straight thread sleeve 26, dowel rod 27, vertical plate 28, dowel rod Hole 29, sleeve 30, support bar 31, prestressed steel bundle hole 32, triangular rib 33, seamed steel plate bottom plate 34, anchor hole 35, anchor bolt 36, wall body 37, retaining wall bottom plate 38, prestressed anchor Cable hole 39, buttress 40.

Detailed ways

The present invention will be further described below in conjunction with the embodiments. The following examples are illustrative only to aid in the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

The high-steep terrain foam concrete lightweight embankment structure has high and steep terrain cross slopes and longitudinal slopes with inverted steps, the step height is 2m, and the inverted steps have strong anti-slip ability. Anti-slip anchors 9 are set at the steps, and shallow grouting reinforcements are set on the surface of the steps, and the thickness of the reinforcements is 2m. Through grouting, the shallow soil on the surface is reinforced to enhance its anti-slip ability, and the foam concrete and the reinforcement are connected together by anti-slip anchors 9 to further play an anti-slip effect. A foam concrete embankment is poured above the steps, and the foam concrete embankment is provided with split joints horizontally and vertically. Since the height of the embankment in the high and steep terrain is very uneven, it is easy to produce uneven settlement, and the uneven deformation of the high and steep terrain is adapted to the horizontal and vertical seams, and the foam concrete embankment is divided into blocks by the seams. The slits are filled with slitted steel plates, the two sides of the slitted steel plates are provided with triangular rib plates 33, and the bottom of the slitted steel plates is provided with a slitted steel plate bottom plate 34. Such a seamed steel plate can stand on its own without support, and can be conveniently used as a formwork for pouring foam concrete. At the same time, the flexural rigidity of the steel plate is improved through the triangular rib to avoid being bent. Dowel rods 27 are arranged between the adjacent blocks of the foam concrete embankment divided by the seam area. One end is freely inserted into the casing 30, the inner diameter of the casing is slightly larger than the diameter of the dowel rod, and the dowel rod can move freely in the casing. Each foam concrete block can transmit force to each other through the dowel rod, and can avoid extrusion and tensile damage caused by thermal expansion and cold contraction. The foam concrete embankment is provided with a multi-stage prefabricated reinforced concrete retaining wall on one side of the slope bottom of the high and steep terrain. The outer side of the prefabricated reinforced concrete retaining wall 16 is provided with a buttress 40. The concrete retaining wall can be used as a formwork for pouring foam concrete, and at the same time can ensure the anti-overturning ability of the foam concrete embankment. In order to further improve the anti-overturning ability, the bottom of the first-stage prefabricated reinforced concrete retaining wall 16 is provided with a rubble concrete foot guard 14, and the bottom of the rubble concrete foot guard 14 is provided with an anti-overturning pile 13. The diameter of the anti-overturning pile is 1m, the spacing is 2m, and the length is 7m. , the pile top of the anti-overturning pile 13 is embedded in the rubble concrete, and is connected with the retaining wall bottom plate 38 of the first-stage prefabricated reinforced concrete retaining wall 16 through the prestressed anchor cable 18. The wall top of the first-stage prefabricated reinforced concrete retaining wall 16 It is connected with the retaining wall bottom plate 38 of the second-stage prefabricated reinforced concrete retaining wall 16 through prestressed anchor cables 18, and the wall body 37 of the first-stage prefabricated reinforced concrete retaining wall 16 is provided with prestressed steel bundles 6 through the foam concrete embankment and fixed at the anchorage. On the pile 10, the diameter of the anchor pile is 0.5m, the spacing is 2m, and the depth of the embedded foundation is 5m. The prestressed steel bundle 6 can stabilize the prefabricated reinforced concrete retaining wall on the one hand, and apply prestress to the foam concrete embankment on the other hand to form each block. A whole. The deformed steel plate 2 is laid at the joints of the top of the high and steep embankment. When uneven settlement occurs, the deformation of the deformed steel plate makes the surface of the embankment transition evenly. The top of the foam concrete embankment is laid with an integrated steel mesh 22, and a pavement structural layer (ie, a pavement structural layer) is laid on the top of the integrated steel mesh 22. Concrete base 3 and asphalt pavement 1), through deformed steel plates and integral steel mesh to avoid uneven settlement caused by pavement cracks. A prefabricated guardrail 21 is installed on the top of the retaining wall at the edge of the embankment, and the guardrail is fixed on the top of the retaining wall by the prestressed anchor cable 18, which can improve the protection ability of the high and steep embankment and ensure the safety of traffic.

The grouting solids are arranged in a depth range of 2-3m along the ground surface, and both the cross section and the longitudinal section are stepped.

The seamed steel plate includes a vertical plate 28, a seamed steel plate bottom plate 34 and a triangular rib 33. The vertical plate 28 is a long strip structure. The bottom of the vertical plate 28 is provided with an elongated seamed steel plate bottom plate 34. Triangular rib plates 33 are arranged on both sides, anchor holes 35 are reserved on the bottom plate 34 of the seamed steel plate, one side of the vertical plate 28 is coated with lubricating oil, and the other side is pasted with a layer of asphalt fir board. The seamed steel plate can play the role of isolating the foamed concrete, forming deformation joints, avoiding the damage caused by thermal expansion and cold contraction and uneven settlement of large-volume foamed concrete. Each foam concrete block is completely separated by lubricating oil and asphalt fir board, and there is no bond between each block.

The foam concrete embankment is provided with a lower reinforcement mesh 15, a middle reinforcement mesh 19 and an upper reinforcement mesh 20. The reinforcement mesh is laid in the embankment, and U-shaped reinforcement is inserted into the foam concrete to fix the reinforcement mesh. The steel bar is bent into a U shape, and the U-shaped steel bar can be used as a fixing card to fix the steel mesh on the poured foam concrete embankment.

The prefabricated reinforced concrete retaining wall 16 is a buttress type retaining wall, the buttress 40 is arranged on the outer side of the retaining wall, the prestressed anchor cable holes 39 are preset on the bottom plate 38 of the retaining wall, and the prestressed anchor cables 18 are pre-embedded on the top of the wall. The prestressed anchor cable is easy to install and has strong connection ability, which is firm and reliable.

The anti-overturning piles 13 and the anchor piles 10 are made of concrete-filled steel tubular piles. The top of the anti-overturning piles 13 is embedded with prestressed anchor cables 18. The prestressed anchor cables 18 can make the anti-overturning piles 13 and the prefabricated reinforced concrete retaining wall. 16 The connection is firm;

One end of the power transmission rod 27 is fixed in the straight threaded sleeve 26, and the other end extends into the sleeve 30. The straight threaded sleeve 26 is directly welded to the seamed steel plate, and the sleeve 30 is fixed to the seamed steel plate through the support ribs 31. to ensure that the dowel bar is not damaged when pouring foam concrete.

The deformed steel plate 2 is strip-shaped, composed of flanges 23 and protrusions 24, and the cross section is butterfly-shaped.

The prefabricated guardrail 21 is an L-shaped structure, and an anchor cable hole is reserved on the bottom plate of the prefabricated guardrail 21 .

A graded crushed stone cushion 12 and a cast-in-place concrete slab 11 are laid on the inner side of the rubble concrete foot guard 14 .

The anchors 36 are threaded steel bars.

The said inverted step, that is, the step surface is inclined to the inner side of the foundation by a certain angle; the surface of the inverted step is covered with permeable geotextile 8 .

The construction method of the foam concrete lightweight embankment structure for high and steep terrain includes the following construction steps:

1) Excavate horizontal steps and vertical steps on the surface of the steep slope terrain, and excavate the steps into an inverted shape, that is, the step surface is inclined to the inside of the foundation at a certain angle;

2) Drill grouting holes evenly on the steps, insert a grouting pipe, and inject cement slurry through a grouting pump to reinforce the shallow surface of the step surface by grouting;

3) Construction of anchor piles 10 and anti-overturning piles 13: Drill holes at the positions of anchor piles 10 and anti-overturning piles 13, insert steel pipes, put steel cages in the steel pipes and pour self-compacting concrete, and the tops of anti-overturning piles 13 are pre-fabricated. Buried prestressed anchor cable 18;

4) Prefabricated prefabricated reinforced concrete retaining wall 16 with buttresses 40 on site, reserved prestressed anchor cable holes 39 on the bottom plate 38 of the retaining wall, and pre-embedded prestressed anchor cables 18 at the top of the wall body 37;

5) The rubble concrete foot guard 14 is poured on top of the anti-overturning pile 13, the graded gravel cushion 12 and the cast-in-place concrete slab 11 are laid on the first step inside the rubble concrete foot guard 14, and the top of the rubble concrete foot guard 14 is laid. The first-stage prefabricated reinforced concrete retaining wall 16 is hoisted, the prestressed anchor cables 18 reserved for the anti-overturning piles 13 pass through the retaining wall bottom plate 38 of the first-stage prefabricated reinforced concrete retaining wall 16, and prestressing is applied and anchored on the first stage with anchors 17. On the retaining wall bottom plate 38 of the primary prefabricated reinforced concrete retaining wall 16;

6) Weld the seam steel bottom plate 34 at the bottom of the vertical plate 28, weld the triangular rib plate 33 on both sides of the vertical plate 28, drill the dowel hole 39 on the vertical plate 28, and weld the straight thread on one side of the dowel hole 39 Sleeve 26, screw one end of the dowel rod 27 into the straight threaded sleeve 26, the other end is covered with a sleeve 30, the bottom of the sleeve 30 is welded to the vertical plate 28 through the support rib 31, and the prestressed steel bundles are on the vertical plate. Drilling prestressed steel bundle holes 32 through the position to form a slit steel plate;

7) Place the split steel plate along the split and fix it with anchors 36, apply butter on one side of the vertical plate 28, and paste a layer of asphalt fir board on the other side;

8) Install the prestressed steel bundle 6 on the first-stage prefabricated reinforced concrete retaining wall 16, pass the prestressed steel bundle 6 through the prestressed steel bundle hole 32 on the split steel plate, and then fix it on the anchor pile 10 and apply prestressing ;

9) Pouring foam concrete in the block enclosed by the seamed steel plate and the first-level prefabricated reinforced concrete retaining wall 16, laying a steel mesh at the design elevation of the steel mesh and fixing it with a u-shaped steel bar when pouring the foam concrete;

10) Hoist the second-stage prefabricated reinforced concrete retaining wall 16 on top of the first-stage prefabricated reinforced concrete retaining wall 16, and pass the prestressed anchor cable 18 on the top of the first-stage prefabricated reinforced concrete retaining wall 16 through the second-stage prefabricated steel bar The retaining wall bottom plate 38 of the concrete retaining wall 16, anchored and prestressed;

11) Set up a split steel plate at the splitting of the foam concrete and fix it with anchors, install the prestressed steel bundle 6 on the second-level prefabricated reinforced concrete retaining wall 16, and fix the prestressed steel bundle 6 through the split steel plate on the anchor pile. 10 and apply prestress;

12) Pouring foamed concrete in the block enclosed by the split steel plate and the second-level prefabricated reinforced concrete retaining wall 16, laying a steel mesh at the design elevation of the steel mesh and fixing it with a u-shaped steel bar when pouring the foamed concrete;

13) Repeat step 10) to step 12) until reaching the design foam concrete pouring elevation;

14) The deformed steel plate 2 is embedded in the seam at the top of the foam concrete embankment before the foam concrete is hardened, and the protrusion 24 of the deformed steel plate 2 is embedded in the seam, and the two flanges 23 are embedded in the foam concrete and fixed with fixing nails 25;

15) Lay the integrated steel mesh 22 on the top of the foam concrete embankment, and the steel mesh is fixed in the foam concrete by anchors;

16) Lay anti-seepage geotextile 4 on the other side stepped slope opposite to the prefabricated reinforced concrete retaining wall 16 and fill with edging soil 7;

17) Install the prefabricated guardrail 21, and the bottom plate of the guardrail is fixed on the top of the prefabricated reinforced concrete retaining wall 16 through the prestressed anchor cables 18 reserved on the top of the prefabricated reinforced concrete retaining wall 16;

18) Construction of pavement structure layer.

Claims (10)

1. A high-steep terrain foam concrete lightweight embankment structure is characterized in that: comprising prestressed steel bundles (6), anti-sliding anchors (9), anchor piles (10), anti-overturning piles (13), rubble concrete Foot guards (14), prefabricated reinforced concrete retaining walls (16), prestressed anchor cables (18), prefabricated guardrails (21) and integral steel mesh (22); high and steep terrain cross and longitudinal slopes are provided with inverted steps, Anti-slip anchors (9) are arranged at the steps, and shallow grouting reinforcements are arranged on the surface of the steps; a foam concrete embankment is poured above the steps, and the foam concrete embankment is provided with seams in both horizontal and vertical directions, and the separation seams are arranged at the edges of the steps at all levels. The middle position; the joints are filled with jointed steel plates, and dowel bars (27) are arranged between the adjacent blocks of the foam concrete embankment divided by the joints; the foam concrete embankment is on the bottom side of the high and steep terrain A multi-stage prefabricated reinforced concrete retaining wall (16) is provided, a buttress (40) is provided on the outer side of the prefabricated reinforced concrete retaining wall (16), and a rubble concrete foot guard (14) is provided at the bottom of the first-stage prefabricated reinforced concrete retaining wall (16). , an anti-overturning pile (13) is arranged at the bottom of the scuff concrete foot guard (14), and the top of the anti-overturning pile (13) is embedded in the scuff concrete and is connected with the retaining wall bottom plate ( 38) Connected by prestressed anchor cables (18); the top of the wall body (37) of the first-stage prefabricated reinforced concrete retaining wall (16) and the retaining wall bottom plate (38) of the second-stage prefabricated reinforced concrete retaining wall (16) pass through The prestressed anchor cables (18) are connected, and the wall body (37) of the prefabricated reinforced concrete retaining wall (16) is provided with prestressed steel bundles (6) which pass through the foam concrete embankment and are fixed on the anchor piles (10); the top of the foam concrete embankment Deformed steel plates (2) are laid at the joints, the deformed steel plates (2) are fixed on the foam concrete by fixing nails (25), an integral steel mesh (22) is laid on the top of the foam concrete embankment, and the integral steel mesh (22) is laid on top In the pavement structure layer, a prefabricated guardrail (21) is installed on the top of the retaining wall at the edge of the foam concrete embankment. 2. The foam concrete lightweight embankment structure for high and steep terrain according to claim 1, characterized in that: the seamed steel plate comprises a vertical plate (28), a seamed steel plate bottom plate (34) and a triangular rib (33), The vertical plate (28) is of a long strip-shaped structure, the bottom of the vertical plate (28) is provided with an elongated seamed steel plate bottom plate (34), the two sides of the vertical plate (28) are provided with triangular rib plates (33), and the seamed steel plate Anchor holes (35) are reserved on the bottom plate (34), one side of the vertical plate (28) is coated with lubricating oil, and the other side is pasted with a layer of asphalt fir board. 3. The high-steep terrain foam concrete lightweight embankment structure according to claim 1, wherein the foam concrete embankment is provided with a lower-layer steel mesh (15), a middle-layer steel mesh (19) and an upper-layer steel mesh (20) , the steel mesh is inserted into the foam concrete through the U-shaped steel bar to fix it. 4. The high-steep terrain foam concrete lightweight embankment structure according to claim 1, wherein the prefabricated reinforced concrete retaining wall (16) is a buttress type retaining wall, and the buttress (40) is arranged on the prefabricated reinforced concrete On the outer side of the retaining wall (16), a prestressed anchor cable hole (39) is preset on the bottom plate (38) of the retaining wall, and a prestressed anchor cable (18) is pre-embedded on the top of the wall body (37). 5. The high-steep terrain foam concrete lightweight embankment structure according to claim 1, characterized in that: the anti-overturning pile (13) and the anchor pile (10) are made of concrete filled steel pipe piles, and the anti-overturning pile (13) is A prestressed anchor cable (18) is pre-embedded on the top of the pile. 6. The foam concrete lightweight embankment structure for high and steep terrain according to claim 1, wherein one end of the dowel rod (27) is fixed in the straight threaded sleeve (26), and the other end extends into the casing (27). 30), the straight threaded sleeve (26) is directly welded on the seamed steel plate, and the sleeve (30) is fixed on the seamed steel plate through the support bars (31). 7. The foam concrete lightweight embankment structure for high and steep terrain according to claim 1, characterized in that: the deformed steel plate (2) is in a strip-like structure, and the deformed steel plate (2) consists of flanges (23) and protrusions ( 24), the cross section of which is butterfly-shaped, and the protrusions (24) are arranged at the slits. 8. The foam concrete lightweight embankment structure for high and steep terrain according to claim 1, characterized in that: a graded gravel cushion (12) and a cast-in-place concrete slab ( 11). 9. The high-steep terrain foam concrete lightweight embankment structure according to claim 1, characterized in that: the inverted step is that the surface of the step is inclined at a certain angle to the inner side of the foundation; the surface of the inverted step is laid with permeable geotextiles (8) . 10. a construction method of high and steep terrain foam concrete lightweight embankment structure as claimed in claim 1, is characterized in that, comprises the following construction steps: 1) Excavate horizontal steps and vertical steps on the surface of the steep slope terrain, and excavate the steps into an inverted shape, that is, the step surface is inclined to the inside of the foundation at a certain angle; 2) Drill grouting holes evenly on the steps, insert a grouting pipe, and inject cement slurry through a grouting pump to reinforce the shallow surface of the step surface by grouting; 3) Construction of anchor piles (10) and anti-overturning piles (13): Drill holes at the positions of anchor piles (10) and anti-overturning piles (13), insert steel pipes, put steel cages in the steel pipes and pour self-compacting Concrete, pre-embedded prestressed anchor cables (18) at the top of the anti-overturning piles (13); 4) Prefabricated reinforced concrete retaining walls (16) with buttresses (40) are prefabricated on site, prestressed anchor cable holes (39) are reserved on the bottom plate (38) of the retaining wall, and prestressed anchor cables are pre-embedded at the top of the wall body (37). (18); 5) Pour rubble concrete foot guards (14) on top of the anti-overturning piles (13), and lay a graded gravel cushion (12) and a cast-in-place concrete slab (12) on the first step inside the rubble concrete foot guard (14). 11), the first-stage prefabricated reinforced concrete retaining wall (16) is hoisted on the top of the rubble concrete foot guard (14), and the prestressed anchor cable (18) reserved for the anti-overturning pile (13) passes through the first-stage prefabricated reinforced concrete retaining wall The retaining wall bottom plate (38) of the wall (16) is prestressed and anchored on the retaining wall bottom plate (38) of the first-stage prefabricated reinforced concrete retaining wall (16) with anchors (17); 6) Weld the seamed steel plate bottom plate (34) at the bottom of the vertical plate (28), weld the triangular rib plates (33) on both sides of the vertical plate (28), and drill the dowel hole (29) on the vertical plate (28), Weld the straight threaded sleeve (26) on one side of the dowel rod hole (29), screw one end of the dowel rod (27) into the straight threaded sleeve (26), and cover the other end with the sleeve (30), The bottom of the pipe (30) is welded on the vertical plate (28) through the support bars (31), and prestressed steel bundle holes (32) are drilled at the position where the prestressed steel bundles pass through the vertical plate to form a split steel plate; 7) Place the split steel plate along the split and fix it with anchors (36), apply butter on one side of the vertical plate (28), and paste a layer of asphalt fir board on the other side; 8) Install the prestressed steel bundle (6) on the wall body (37) of the first-stage prefabricated reinforced concrete retaining wall (16), and pass the prestressed steel bundle (6) through the prestressed steel bundle hole ( 32), then fixed on the anchor pile (10) and prestressed; 9) Pouring foamed concrete in the block enclosed by the seamed steel plate and the first-level prefabricated reinforced concrete retaining wall (16), laying a steel mesh at the design elevation of the steel mesh and fixing it with U-shaped reinforcement when pouring the foamed concrete; 10) Hoist the second-stage prefabricated reinforced concrete retaining wall (16) on top of the first-stage prefabricated reinforced concrete retaining wall (16), and thread the prestressed anchor cables (18) on the top of the first-stage prefabricated reinforced concrete retaining wall (16) through; Pass through the retaining wall bottom plate (38) of the second-stage prefabricated reinforced concrete retaining wall (16), anchor and apply prestress; 11) Set up jointed steel plates at the joints of foam concrete and fix them with anchors (36), install prestressed steel bundles (6) on the wall body (37) of the second-level prefabricated reinforced concrete retaining wall (16), The prestressed steel bundle (6) is fixed on the anchor pile (10) through the slit steel plate and prestressed; 12) Pouring foamed concrete in the block enclosed by the split steel plate and the second-level prefabricated reinforced concrete retaining wall (16), laying the steel mesh at the design elevation of the steel mesh and fixing it with U-shaped reinforcement when pouring the foamed concrete; 13) Repeat step 10) to step 12) until reaching the design foam concrete pouring elevation; 14) The deformed steel plate (2) is embedded in the seam at the top of the foam concrete embankment before the foam concrete hardens, the protrusion (24) of the deformed steel plate (2) is embedded in the seam, and the two flanges (23) are embedded in the foam concrete and Drive in the fixing nails (25) to fix; 15) Laying an integral steel mesh (22) on top of the foam concrete embankment, and the integral steel mesh (22) is fixed in the foam concrete by anchors; 16) Lay anti-seepage geotextiles (4) on the other side of the stepped slope opposite to the prefabricated reinforced concrete retaining wall (16) and fill with edging soil (7); 17) A prefabricated guardrail (21) is installed, and the bottom plate of the prefabricated guardrail (21) is fixed on the top of the prefabricated reinforced concrete retaining wall (16) through a prestressed anchor cable (18) reserved at the top of the prefabricated reinforced concrete retaining wall (16); 18) Construction of pavement structure layer.

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