A construction method for widening and filling lightweight embankments with large-size construction waste

Abstract

A construction method for widening and filling lightweight embankments with large-particle construction waste includes the following construction steps: 1) construction preparation; 2) waste crushing; 3) waste concrete lightweight backfill mix design; 4) foundation treatment of the roadbed widening area; 5) side formwork support; and 6) waste concrete lightweight backfill construction. The present invention first crushes the waste concrete using a pressure device, then performs auxiliary crushing using a second water sprinkler to reduce dust on the surface of the waste concrete aggregate, and vibrates and screens the waste concrete aggregate using a first aggregate screen to improve the accuracy of waste concrete aggregate particle size control. Lightweight waste concrete backfill material is used in the widening area foundation, and oblique reinforcements are inserted to improve the bearing capacity of the foundation soil. Prefabricated formwork is used on the sides of the widening area to avoid the problem of disassembling and installing the formwork, and the lateral position of the transverse tie bars is controlled by tie bar adjustment bolts to achieve dynamic control of the transverse tie bars.

Description

Technical Field

[0001] The invention relates to a roadbed widening construction method in road engineering. Background Art

[0002] With the rapid development of my country's economy, the demand for road transportation in my country is also increasing year by year. The traffic volume of some existing roads has reached saturation, and they need to be widened and renovated to improve their traffic capacity. Due to the complexity and uniqueness of road widening projects, there is often a large differential settlement between the new and old roadbeds, resulting in serious longitudinal cracks on the road. Therefore, it is very necessary to use lightweight materials as new roadbed materials and study their application in widening existing roads. In the prior art, there is a highway roadbed widening structure. This structure has multiple steps on the slope side of the original roadbed, and the inner sides of the steps are each provided with a plug-in groove. L-shaped steel frames are provided on the plug-in groove and the steps. A first supporting steel frame is fixedly connected between adjacent L-shaped steel frames. A second supporting frame is provided between the L-shaped steel frame close to the ground and the ground. The second supporting frame is inserted into the ground at one end away from the L-shaped steel frame. Concrete filling material is poured on the slope of the original roadbed. The concrete filling material completely covers the L-shaped steel frame, the first supporting steel frame, and the second supporting frame. A pavement structure is laid on the original roadbed and the concrete filling material on the side away from the ground. While this method can improve the connection strength between the original and new roadbeds, it fails to consider the potential negative impacts of the new roadbed filler itself on construction and the cost of the project, leaving room for improvement in overall structural performance. Therefore, to improve the construction quality and efficiency of embankment widening systems, a lightweight embankment widening method using large-size construction waste is urgently needed to improve the accuracy of waste concrete aggregate size control, reduce the deadweight of the new roadbed filler, and enhance the lateral stability of the embankment structure. Summary of the Invention

[0003] The purpose of the present invention is to provide a construction method for widening and filling lightweight embankments with large-particle construction waste, so as to overcome the shortcomings of existing road widening technologies, such as poor lateral stability of embankment structures and low accuracy in controlling the particle size of waste concrete aggregates.

[0004] To achieve the above-mentioned object, the present invention adopts the following technical solution: a construction method for widening and filling a lightweight embankment with large-size construction waste, comprising the following construction steps:

[0005] 1) Construction preparation: Conduct on-site surveys to determine the locations for embankment step excavation and prepare the necessary materials and equipment for construction;

[0006] 2) Waste crushing: a pressure support is arranged on the foundation soil, and a pressure device and a pressure plate opposite to the material crushing box are arranged on the lower surface of the pressure support; a tire frame bottom plate is arranged on the upper surface of the foundation soil, and bottom plate adjustment bolts and adjustable support piers are arranged between the tire frame bottom plate and the foundation soil; along the height direction of the material crushing box, a first supporting beam, a second supporting beam, a first aggregate screen, a discharge chute and a drainage chute are arranged in sequence from top to bottom inside the material crushing box; a first supporting beam, a second supporting beam, a first aggregate screen, a discharge chute and a drainage chute are arranged on the second supporting beam, the first aggregate screen, the discharge chute and the drainage chute; ... A second discharge hole is reserved at a relative position between the channel and the material crushing box; a first cutting blade and a first limiting side plate are arranged on the first supporting beam, and a first water sprinkler is arranged symmetrically on the side wall of the material crushing box above the first supporting beam; a second cutting blade and a second limiting side plate are arranged on the second supporting beam, and a second water sprinkler is arranged symmetrically on the side wall of the material crushing box between the second supporting beam and the first supporting beam, and then a first discharge plate is arranged at the second discharge hole outside the second supporting beam; under the slidable blade in the second cutting blade A blade connecting rod is provided on the surface, one end of the blade connecting rod is connected to the slidable blade, and the other end is connected to the blade slide, and a blade slide groove is provided on the outside of the blade slide for the blade slide to slide; a blade connecting rod is provided on the lower surface of the blade slide, and different blade connecting rods are connected by a sliding connecting rod, and an adjusting bolt is provided at the end of the sliding connecting rod close to the second discharge hole, and the left and right sliding of the sliding connecting rod is controlled by the adjusting bolt; a vibration support is provided at the contact part between the lower surface of the first aggregate screen and the material crushing box, and a second discharge plate is provided at the second discharge hole outside the first aggregate screen, and then the first aggregate recovery trough is arranged at the terminal end of the second discharge plate; a third discharge hole is provided on the surface of the discharge chute close to the second discharge hole, and a third discharge plate is provided at the second discharge hole outside the discharge chute, and then the second aggregate recovery trough is arranged at the terminal end of the third discharge plate; an aggregate guide plate is provided on the side wall of the material crushing box between the first aggregate screen and the discharge chute; a fourth discharge plate is provided at the second discharge hole outside the drainage chute, and a wastewater recovery trough is arranged at the terminal end of the fourth discharge plate;

[0007] 3) Mix ratio design of waste concrete lightweight backfill: The mix ratio design of waste concrete lightweight backfill includes pretreatment of waste concrete aggregate, preparation of foamed concrete slurry, and casting of waste concrete lightweight backfill test blocks. Five types of aggregates with particle sizes ranging from 9.5 to 16 mm, 16 to 19 mm, 19 to 26.5 mm, 26.5 to 31.5 mm, and 31.5 to 37.5 mm are selected from the second aggregate recovery tank with a mass ratio of 2:4:8:3:3. The waste concrete aggregate with a volume ratio of 20% to 30% is weighed and then pre-soaked. The foaming agent and test water are mixed in a foaming machine at a ratio of 1:30 to 1:50 to form stable foam. 800 to 900 kg / m 3 of cement, and then weigh 440-495kg / m3 Pour the cement and test water into the mortar mixer and stir for 3 to 4 minutes, then weigh 1.6 to 1.8 kg / m 3 Pour the polypropylene fiber into the mortar mixer and continue stirring for 3 to 4 minutes, then add 40 to 45 kg / m 3 The stable foam is poured into the mortar mixer and stirred for 2 to 3 minutes to form a foamed concrete slurry for standby use; the pouring is divided into three layers, and the pouring heights are 2 / 5, 2 / 5, and 1 / 5 of the test block mold height respectively. First, the foamed concrete slurry is poured into the test block mold with a size of 150 mm × 150 mm × 150 mm to the set height, and then the waste concrete aggregate is evenly sprinkled into the test block mold, so that it sinks under the action of its own weight until the volume remains unchanged. The above steps are followed until the casting of the waste concrete lightweight backfill test block is completed; the waste concrete lightweight backfill test block is covered with a film, cured indoors at 20±1°C for 24 hours, and then demoulded and placed in a constant temperature water tank for curing for 28 days;

[0008] 4) Foundation treatment of the roadbed widening area: Dig a widening area foundation in the foundation soil, drill holes from the widening area into the widening area foundation, and insert oblique reinforcements; set up a side form foundation inside the widening area foundation, and install a side form support plate at the connection between the top of the side form foundation and the side form formwork. Use inserted reinforcement to firmly connect the side form support plate to the side form foundation and the widening area foundation;

[0009] 5) Side formwork support: Set the side formwork on the upper part of the side formwork support plate, and set the tie bar slide groove on the inner side wall of the side formwork. Then, set the tie bar slide plate that can slide along the tie bar slide groove in the tie bar slide groove; set the side formwork reinforcement between the side formwork and the widening area foundation, and make the bottom end of the side formwork reinforcement and the widening area foundation firmly connected through the reinforcement bottom plate; set the transverse tie bar on the embankment step, one end of the transverse tie bar is anchored to the old roadbed soil, and the other end is connected to the slide plate connecting bar through the tie bar adjustment bolt, and the position of the transverse tie bar is controlled by the tie bar adjustment bolt; set the vertical clamping plate between the transverse tie bars in the same vertical plane, and make the vertical clamping plate firmly connected to the transverse tie bar through the clamping plate connection groove and the clamping plate connection bar; set the oblique reinforcement between the vertical clamping plate and the old roadbed soil, and set the clamping plate anchor pier at the junction of the bottom end of the oblique reinforcement and the old roadbed soil;

[0010] 6) Construction of lightweight waste concrete backfill: first pour 70-80mm foam concrete slurry above the widened area foundation, and then evenly spread waste concrete aggregate with a volume ratio of 20%-30% within 0-1 hour; after the volume of the first layer of lightweight waste concrete backfill stabilizes, pour foam concrete slurry and waste concrete aggregate from bottom to top in sequence, and repeat the above operation with a pouring height of 0.8-1m, then insert built-in connecting reinforcement into the surface of the lightweight waste concrete backfill, let it stand for 12-24 hours, and continue pouring until the lightweight waste concrete backfill is initially solidified; after the lightweight waste concrete backfill is initially solidified, cover the top with a water-retaining geomembrane; set an upper sealing layer on the uppermost surface of the lightweight waste concrete backfill.

[0011] Furthermore, in step 2), the pressure support is made of rolled steel, and screw holes connected to the pressure device are set on the pressure support; the pressure device adopts hydraulic pressure, one end is connected to the pressure support by welding, and the other end is connected to the pressure plate by screw holes, and the pressure plate is rolled from steel plate; the first cutting blade consists of four fixed blades, which are closed rectangles and are firmly connected to the side wall of the material crushing box through a supporting beam; the second cutting blade includes a sliding blade and three fixed blades, so that the sliding blade is welded to the blade slide through a blade connecting rod, and the second cutting blades are welded to each other through a blade telescopic rod; the cross section of the blade connecting falcon is "T"-shaped and is made of rolled steel plate, one end is welded to the blade slide, and the other end is welded to the sliding connecting rod; the adjusting bolt includes a screw and a nut, and the tightening directions of the screws on both sides of the nut are opposite; the first water sprinkler adopts an energy-saving water sprinkler with a vertical inclination angle of 60° to 80°; the second water sprinkler adopts a high-strength water sprinkler, which is mirror-symmetrically arranged on the side wall of the material crushing box The vertical inclination angle is 40°~60°, which can realize the secondary crushing of the waste concrete aggregate between the second limiting side plates; the first limiting side plates and the second limiting side plates are both made of rolled steel plates, and the first discharge hole for the aggregate to pass through is preset on the second limiting side plate; the first aggregate screen adopts a 37.5mm sieve hole; the vibration support adopts mechanical vibration, is firmly connected to the support bottom plate by bolts, and the support bottom plate is welded to the side wall of the material crushing box, and the vibration support assists in the screening of aggregates larger than 37.5mm Aggregates of different particle sizes are transported to the first aggregate recovery trough through the first discharge plate; the discharge chute is made of rolled steel plate, and the diameter of the third discharge hole on the surface of the discharge chute is 9.5mm. Aggregates with a particle size larger than 9.5mm are transported to the second aggregate recovery trough through the third discharge plate; the discharge chute and the drainage chute are both arranged obliquely downward, and the inclination angle is controlled at 20°~40°. Aggregates and wastewater with a particle size smaller than 9.5mm are transported to the wastewater recovery trough through the drainage chute, and a second aggregate screen for aggregate sedimentation is arranged in the wastewater recovery trough.

[0012] Furthermore, in step 3), the waste concrete lightweight backfill is prepared from waste concrete aggregate and foamed concrete slurry; the foamed concrete slurry is prepared from cement, test water, stabilized foam and polypropylene fiber; the cement is ordinary Portland cement; the polypropylene fiber has a length of 12 to 19 mm; the foaming agent is a composite foaming agent with a foaming multiple of more than 20 times; the waste concrete aggregate needs to be soaked in the test water for 20 to 40 minutes, taken out and drained until there is no visible water on the surface.

[0013] Furthermore, in step 4), the widening area foundation adopts lightweight consolidated soil with a rectangular cross-section; the oblique reinforcement body is rolled from steel pipes or steel sections, and the horizontal inclination angle is controlled at 50° to 70°; the side form foundation adopts a prefabricated pier with a trapezoidal cross-section; the side form support plate is rolled from steel plates, the lower surface of the side form support plate is connected to the side form foundation and the widening area foundation by inserting ribs, and the upper surface is welded to the side form template.

[0014] Furthermore, in step 5), the side formwork forms are made of precast concrete slabs or steel plates, and different side formwork forms are firmly connected by formwork connectors with trapezoidal cross sections, and the upper surface of the formwork connector is welded to the side formwork formwork, and the lower surface is connected to the connecting slide plate by nuts, and a connecting slide groove for the connecting slide plate to slide is provided on the outside of the connecting slide plate; the side formwork reinforcement is made of threaded steel bars or rolled screws; the vertical clamping plate is made of rolled steel plates, and the clamping plate bottom plate is welded to the vertical clamping plate, and then the clamping plate bottom plate is firmly connected to the widened area foundation by clamping plate anchor bars; the transverse tie bars are made of threaded steel bars, and are connected to the tie bar adjustment bolts through screw holes; the embankment step height is 0.5m~0.8m and the width is 1.5m~2m.

[0015] Furthermore, in step 6), the built-in connecting reinforcement is made of threaded steel bars, and connecting threads are provided inside the threaded steel bars; and the upper closed layer is cast by concrete.

[0016] The beneficial effects of the present invention are as follows: the present invention sequentially arranges a first cutting blade and a second cutting blade inside the material crushing box from top to bottom along the height direction of the material crushing box, first crushes the waste concrete by a pressurizing device, and then performs auxiliary crushing by a second water sprayer, which can reduce dust on the surface of the waste concrete aggregate and improve the environment; at the same time, the left and right sliding of the slidable blade can be controlled by an adjusting bolt, and the waste concrete aggregate can be vibrated and screened by the first aggregate screen, thereby improving the accuracy of the waste concrete aggregate particle size control; based on the waste concrete aggregate and the foam concrete slurry, a mixing ratio range of the waste concrete lightweight backfill is proposed, which can reduce the weight of the concrete material; at the same time The present invention describes the mixing time, layered filling control, and curing temperature during the preparation of lightweight waste concrete backfill, which can improve the uniformity of material preparation; waste concrete lightweight backfill material is used in the widening area foundation, and oblique reinforcement is inserted to improve the bearing capacity of the foundation soil; assembled formwork is used on the side of the widened area to avoid the problem of dismantling and installing the mold, and the lateral position of the transverse tie bars is controlled by the tie bar adjustment bolts to achieve dynamic control of the transverse tie bars; at the same time, the present invention firmly connects the old roadbed soil and the widened area through the transverse tie bars, and enhances the integrity between the transverse tie bars through the vertical clips and the clip plate connecting bars, which can improve the lateral stability of the embankment structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a construction flow chart of the method of the present invention;

[0018] Figure 2 is a schematic diagram of an embankment widening structure using the method of the present invention;

[0019] Figure 3 A schematic structural diagram of a waste concrete crushing device used in the method of the present invention;

[0020] Figure 4 Flow chart of the steps for preparing waste concrete lightweight backfill test blocks;

[0021] Figure 5 This is the construction flow chart of waste concrete lightweight backfill;

[0022] Figure 6 yes Figure 3 a top view of the first cutting blade structure;

[0023] Figure 7 yes Figure 3 a top view of the second cutting blade structure;

[0024] Figure 8 yes Figure 3 Schematic diagram of the sliding device structure;

[0025] Figure 9 yes Figure 2 Schematic diagram of vertical pallet structure;

[0026] Figure 10 yes Figure 2 Schematic diagram of the side formwork structure;

[0027] Figure 11 yes Figure 2 Schematic diagram of the connecting layer structure of waste concrete lightweight backfill;

[0028] In the figure: 1-foundation soil; 2-pressure support frame; 3-material crushing box; 4-pressure device; 5-pressure plate; 6-tire frame bottom plate; 7-bottom plate adjustment bolt; 8-adjustable support pier; 9-first supporting beam; 10-second supporting beam; 11-first aggregate screen; 12-discharge chute; 13-drainage chute; 14-second discharge hole; 15-first cutting blade; 16-first limiting side plate; 17-first water sprayer; 18-second cutting blade; 19-second limiting side plate; 20-side wall of material crushing box; 21-second water sprayer; 22-first discharge plate; 23-adjustable Sliding blade; 24-blade connecting rod; 25-blade slide; 26-blade slide; 27-blade connecting rod; 28-sliding connecting rod; 29-adjusting bolt; 30-vibration support; 31-second discharge plate; 32-first aggregate recovery trough; 33-third discharge hole; 34-third discharge plate; 35-second aggregate recovery trough; 36-aggregate guide plate; 37-fourth discharge plate; 38-wastewater recovery trough; 39-fixed blade; 40-blade telescopic rod; 41-first discharge hole; 42-support base plate; 43-second aggregate screen; 44-waste concrete lightweight backfill; 55-widening area foundation; 56-oblique reinforcement; 57-side form foundation; 58-side formwork; 59-side formwork support plate; 60-inserted reinforcement; 61-tie reinforcement chute; 62-tie reinforcement slide; 63-side form reinforcement; 64-tie reinforcement base plate; 65-embankment step; 66-transverse tie reinforcement; 67-old roadbed soil; 68-tie reinforcement adjustment bolt; 69-slide plate connecting reinforcement; 70-vertical pallet; 71-pallet connecting groove; 72-pallet connecting reinforcement; 73-oblique tie reinforcement; 74-pallet anchor pier; 75-formwork connecting pier; 76-connecting pier slide; 77-connecting pier chute; 78-pallet base plate; 79-pallet anchor reinforcement; 80-internal connecting reinforcement; 81-water-retaining geomembrane; 82-upper sealing layer. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are now described in detail with reference to the accompanying drawings:

[0030] A method for widening and filling a lightweight embankment with large-size construction waste includes the following steps:

[0031] 1) Construction preparation: Conduct on-site survey to determine the location of embankment step 65 excavation and prepare the necessary materials and equipment for construction;

[0032] 2) Waste crushing: a pressure support frame 2 is arranged on the foundation soil 1, and a pressure device 4 and a pressure plate 5 are arranged on the lower surface of the pressure support frame 2 opposite to the material crushing box 3; a tire frame bottom plate 6 is arranged on the upper surface of the foundation soil 1, and a bottom plate adjustment bolt 7 and an adjustable support pier 8 are arranged between the tire frame bottom plate 6 and the foundation soil 1; along the height direction of the material crushing box 3, a first supporting beam 9, a second supporting beam 10, a first aggregate screen 11, a discharge chute 12 and a drainage chute 13 are arranged in sequence from top to bottom inside the material crushing box 3; the second supporting beam 10, the first aggregate screen 11, the discharge chute 12 and the drainage chute 13 are aligned with the material crushing box 3. A second discharge hole 14 is reserved relative to the crushing box 3; a first cutting blade 15 and a first limiting side plate 16 are set on the first supporting beam 9, and a first water sprayer 17 is arranged in a mirror-symmetrical manner on the side wall 20 of the material crushing box on the upper part of the first supporting beam 9; a second cutting blade 18 and a second limiting side plate 19 are set on the second supporting beam 10, and a second water sprayer 21 is set in a mirror-symmetrical manner on the side wall 20 of the material crushing box between the second supporting beam 10 and the first supporting beam 9, and then a first discharge plate 22 is set at the second discharge hole 14 outside the second supporting beam 10; a blade is set on the lower surface of the slidable blade 23 in the second cutting blade 18 A connecting rod 24 is provided, one end of the blade connecting rod 24 is connected to the slidable blade 23, and the other end is connected to the blade slide 25, and a blade slide 26 for sliding the blade slide is provided on the outside of the blade slide 25; a blade connecting rod 27 is provided on the lower surface of the blade slide 25, and different blade connecting rods 27 are connected by a sliding connecting rod 28, and an adjusting bolt 29 is provided at the end of the sliding connecting rod 28 near the second discharge hole 14, and the left and right sliding of the sliding connecting rod 28 is controlled by the adjusting bolt 29; a vibration support 30 is provided at the contact part between the lower surface of the first aggregate screen 11 and the material crushing box 3, and a second row of the outer side of the first aggregate screen 11 is provided. A second discharge plate 31 is provided at the material hole 14, and a first aggregate recovery trough 32 is arranged at the terminal end of the second discharge plate 31; a third discharge hole 33 is provided on the surface of the discharge chute 12 near the second discharge hole 14, and a third discharge plate 34 is provided at the second discharge hole 14 outside the discharge chute 12, and a second aggregate recovery trough 35 is arranged at the terminal end of the third discharge plate 34; an aggregate guide plate 36 is provided on the side wall 20 of the material crushing box between the first aggregate screen 11 and the discharge chute 12; a fourth discharge plate 37 is provided at the second discharge hole 14 outside the drainage chute 13, and a wastewater recovery trough 38 is arranged at the terminal end of the fourth discharge plate 37;

[0033] 3) Mix ratio design of waste concrete lightweight backfill: The mix ratio design of waste concrete lightweight backfill 44 includes four stages: pretreatment of waste concrete aggregate, preparation of foamed concrete slurry, preparation of waste concrete lightweight backfill 44 test blocks, and curing. Five types of aggregates with particle sizes ranging from 9.5 to 16 mm, 16 to 19 mm, 19 to 26.5 mm, 26.5 to 31.5 mm, and 31.5 to 37.5 mm are selected from the second aggregate recovery tank 35 in a mass ratio of 2:4:8:3:3. 20% to 30% of the volume ratio of waste concrete aggregate is weighed and then pre-soaked. A foaming agent and test water are mixed in a foaming machine at a ratio of 1:30 to 1:50 to form stable foam. 800 to 900 kg / m 3 of cement, and then weigh 440-495kg / m 3 Pour the cement and test water into the mortar mixer and stir for 3 to 4 minutes, then weigh 1.6 to 1.8 kg / m 3 Pour the polypropylene fiber into the mortar mixer and continue stirring for 3 to 4 minutes, then add 40 to 45 kg / m 3 The stable foam is poured into the mortar mixer and stirred for 2 to 3 minutes to form a foamed concrete slurry for standby use; the pouring is divided into three layers, and the pouring heights are 2 / 5, 2 / 5, and 1 / 5 of the test block mold height respectively. The foamed concrete slurry is first poured into the test block mold with a size of 150 mm × 150 mm × 150 mm to the set height, and then the waste concrete aggregate is evenly sprinkled into the test block mold, so that it sinks under the action of its own weight until the volume remains unchanged. The above steps are followed until the pouring of 44 test blocks of the waste concrete lightweight backfill body is completed; the 44 test blocks of the waste concrete lightweight backfill body are covered with a film, cured indoors at 20±1°C for 24 hours, and then demoulded and placed in a constant temperature water tank for curing for 28 days;

[0034] 4) Foundation treatment in the roadbed widening area: Dig a widening area foundation 55 in the foundation soil 1, drill holes from the widening area into the widening area foundation 55, and insert oblique reinforcements 56; set a side form foundation 57 inside the widening area foundation 55, and install a side form support plate 59 at the connection between the top of the side form foundation 57 and the side form template 58. Use inserted reinforcement 60 to firmly connect the side form support plate 59 to the side form foundation 57 and the widening area foundation 55;

[0035] 5) Side formwork support: Set the side formwork 58 on the upper part of the side formwork support plate 59, and set the tie bar slide 61 on the inner wall of the side formwork 58. Then, set the tie bar slide 62 in the tie bar slide 61, which can slide along the tie bar slide. Set the side formwork reinforcement 63 between the side formwork 58 and the widening area foundation 55, and make the bottom end of the side formwork reinforcement 63 firmly connected to the widening area foundation 55 through the reinforcement bottom plate 64. Set the transverse tie bar 66 on the embankment step 65, and anchor one end of the transverse tie bar 66 to the old roadbed soil. 67, the other end is connected to the slide connecting bar 69 through the tie bar adjustment bolt 68, and the position of the transverse tie bar 66 is controlled by the tie bar adjustment bolt 68; a vertical clamping plate 70 is provided between the transverse tie bars 66 in the same vertical plane, and the vertical clamping plate 70 is firmly connected to the transverse tie bars 66 through the clamping plate connection groove 71 and the clamping plate connection bar 72; an oblique tie bar 73 is provided between the vertical clamping plate 70 and the old roadbed soil 67, and a clamping plate anchor pier 74 is provided at the position where the bottom end of the oblique tie bar 73 connects with the old roadbed soil 67;

[0036] 6) Construction of lightweight waste concrete backfill: First, pour 70-80 mm foam concrete slurry above the widened area foundation 55, and then evenly spread waste concrete aggregate with a volume ratio of 20%-30% within 0-1 hour; after the volume of the first layer of lightweight waste concrete backfill 44 stabilizes, pour foam concrete slurry and waste concrete aggregate from bottom to top, and repeat the above operation. The pouring height is 0.8-1 m. Then, insert built-in connecting bars 80 on the surface of the lightweight waste concrete backfill 44 and let it stand for 12-24 hours. After the lightweight waste concrete backfill 44 initially sets, continue pouring until the pouring is completed; after the lightweight waste concrete backfill 44 initially sets, cover the top with a water-retaining geomembrane 81; and set an upper sealing layer 82 on the uppermost surface of the lightweight waste concrete backfill 44.

[0037] Preferably, a first cutting blade 15 and a second cutting blade 18 are sequentially arranged from top to bottom within the material crushing box 3 along its height. The waste concrete is first crushed by the pressurizing device 4, and then assisted by the second water sprinkler 21. The left and right sliding of the slidable blade 23 is controlled by the adjusting bolt 29, and the waste concrete aggregate is vibrated and screened by the first aggregate screen 11. Based on the waste concrete aggregate and the foamed concrete slurry, a mix ratio range for the waste concrete lightweight backfill 44 is proposed, and the mixing time, layered filling control, and curing temperature of the waste concrete lightweight backfill 44 preparation process are described. The waste concrete lightweight backfill material is used in the widening area foundation 55, and an assembled formwork is used on the side of the widening area. The lateral position of the transverse tie bars 66 is then controlled by the tie bar adjustment bolts 68. The old roadbed soil 67 is firmly connected to the widening area by the transverse tie bars 66, and the integrity of the transverse tie bars 66 is enhanced by the vertical clamps 70 and the clamp connecting bars 72.

[0038] The foundation soil 1 is a hard-plastic clay. The pressure support 2 is rolled from 200×200×8×12 steel sections and has screw holes for connecting to the pressure device 4. The pressure device 4 uses hydraulic pressure, with one end welded to the pressure support 2 and the other end screwed to the pressure plate 5, which is rolled from 20mm thick steel plate.

[0039] The material crushing box 3 includes a material crushing box side wall 20, which is a rectangular parallelepiped with a width of 1.5m and a height of 2m. The material crushing box side wall 20 is rolled from a steel plate with a thickness of 10mm.

[0040] The tire frame bottom plate 6 is rolled from a steel plate with a thickness of 10 mm.

[0041] The bottom plate adjusting bolt 7 comprises a steel pipe screw and a bolt with a diameter of 60 mm, and the tightening directions of the screws on both sides of the bolt are opposite.

[0042] The adjustable supporting pier 8 is rolled from a steel plate having a thickness of 10 mm.

[0043] The first supporting beam 9 and the second supporting beam 10 are both made of H-shaped steel with specifications of 100×100×6×8.

[0044] The first aggregate screen 11 is made of high manganese steel screen with an aperture controlled at 9.5 mm.

[0045] The discharge chute 12 is rolled from a steel plate with a thickness of 10 mm and is arranged obliquely downward with an inclination angle of 30°. The diameter of the third discharge hole 33 on the surface of the discharge chute 12 is 9.5 mm. Aggregates with a particle size larger than 9.5 mm are transported to the second aggregate recovery trough 35 through the third discharge plate 34; the third discharge plate 34 is rolled from a steel plate with a thickness of 10 mm; the second aggregate recovery trough 35 is rolled from a steel plate with a thickness of 2 mm, with a rectangular cross-section, a depth of 0.8 m and a width of 0.3 m.

[0046] The drainage chute 13 is arranged obliquely downward with an inclination angle of 30°. Aggregates and wastewater with a particle size of less than 9.5 mm are transported to the wastewater recovery trough 38 through the drainage chute 13, and a second aggregate screen 43 for aggregate sedimentation is arranged in the wastewater recovery trough 38; the wastewater recovery trough 38 is rolled from a steel plate with a thickness of 2 mm, a depth of 0.6 m and a width of 0.3 m; the second aggregate screen 43 is a punched plate screen with a pore size of 2.36 mm.

[0047] The second discharge hole 14 has a rectangular cross section and a height of 75 mm.

[0048] The first cutting blade 15 is composed of four fixed blades 39 and is in a closed rectangular shape; the fixed blades 39 are rolled from a steel plate with a thickness of 5 mm.

[0049] The first limiting side plate 16 and the second limiting side plate 19 are both rolled from 10 mm thick steel plates, and both have trapezoidal cross sections. A first discharge hole 41 for aggregate to pass through is preset on the second limiting side plate 19; the first discharge hole 41 is a circular discharge hole with a diameter of 75 mm.

[0050] The first sprinkler 17 is an energy-saving sprinkler with a vertical inclination angle of 70°.

[0051] The second cutting blade 18 includes a slidable blade 23 and three fixed blades 39, so that the slidable blade 23 is welded to the blade slide 25 through the blade connecting rod 24, and the second cutting blades 18 are welded to each other through the blade telescopic rod 40; the slidable blade 23 is rolled from a steel plate with a thickness of 5 mm; the blade connecting rod 24 is rolled from a steel pipe with a diameter of 100 mm; the blade slide 25 is rolled from a steel plate with a thickness of 10 mm, a width of 20 cm and a length of 10 cm.

[0052] The second water sprinkler 21 is a high-intensity water sprinkler, which is arranged in a mirror-symmetrical manner on the side wall 20 of the material crushing box and has a vertical inclination angle of 60°.

[0053] The first discharge plate 22 is formed by rolling a steel plate with a thickness of 10 mm.

[0054] The blade chute 26 has a T-shaped cross section and is rolled from a 3mm thick steel plate. It has a length of 5cm and a width of 10cm.

[0055] The blade connecting falcon 27 has a "T"-shaped cross section and is rolled from a 3mm thick steel plate. It is 5cm long and 10cm wide. One end is welded to the blade slide 25 and the other end is welded to the sliding link 28. The sliding link 28 is rolled from a 60mm diameter screw.

[0056] The adjusting bolt 29 includes a screw rod and a nut with a diameter of 30 mm, and the tightening directions of the screw rods on both sides of the nut are opposite.

[0057] The vibration support 30 adopts mechanical vibration and is firmly connected to the support base plate 42 by bolts, and the support base plate 42 is welded to the side wall 20 of the material crushing box. The vibration support 30 assists in aggregate screening, and aggregates with a particle size greater than 37.5 mm are transported to the first aggregate recovery trough 32 through the first discharge plate 22; the first aggregate recovery trough 32 is rolled from a steel plate with a thickness of 2 mm, a rectangular cross-section, a depth of 1.2 m, and a width of 0.3 m; the support base plate 42 is rolled from a steel plate with a thick bottom of 10 mm.

[0058] The second discharge plate 31 is rolled from a steel plate with a thickness of 20 mm.

[0059] The collecting guide plate 36 is made of PVC board.

[0060] The fourth discharge plate 37 is rolled from a steel plate with a thickness of 10 mm.

[0061] The blade telescopic rod 40 is rolled from a steel plate with a thickness of 20 mm.

[0062] The waste concrete lightweight backfill 44 is prepared from waste concrete aggregate and foamed concrete paste; the waste concrete aggregate has a particle size range of 9.5-16 mm, 16-19 mm, 19-26.5 mm, 26.5-31.5 mm, and 31.5-37.5 mm, and the mass ratio of the five types of aggregate is 2:4:8:3:3, and the bulk density is 1285 kg / m 3 The foamed concrete paste was prepared from cement, test water, stabilized foam, and polypropylene fiber. Tap water was used for the test. The water exudation rate of the stabilized foam after 1 hour was 74 ml. 42.5 ordinary Portland cement was used as cement. The polypropylene fiber was 19 mm long and had a specific gravity of 0.91 g / cm. 3 , elastic modulus 4125MPa, ultimate elongation 24%.

[0063] The foaming agent and test water are mixed in a foaming machine at a ratio of 1:30 to 1:50 to form stable foam; the foaming agent is a composite foaming agent, the dilution ratio with water is 1:50, and the foaming ratio is 21 times; the foaming machine is a fully automatic cement foaming machine.

[0064] The mortar mixer adopts a forced single-horizontal concrete mixer.

[0065] The test block mold is a cube with dimensions of 150 mm × 150 mm × 150 mm.

[0066] The widening area foundation 55 uses waste concrete lightweight backfill material and has a rectangular cross section.

[0067] The oblique reinforcement 56 is made of a steel plate with a thickness of 20 mm and a horizontal inclination angle of 60°.

[0068] The side formwork foundation 57 is a prefabricated pier body cast with concrete of strength grade C30, and has a trapezoidal cross section.

[0069] The side formwork templates 58 are rolled from 4mm thick steel plates, and different side formwork templates 58 are firmly connected by template connecting falcons 75 with a trapezoidal cross section; the template connecting falcons 75 are rolled from 10mm thick steel plates, with a "T"-shaped cross section and a width of 8cm.

[0070] The side form support plate 59 is rolled from a steel plate with a thickness of 10 mm. The lower surface of the side form support plate 59 is connected to the side form base 57 and the widening area base 55 through the inserted joint rib 60, and the upper surface is welded to the side form template 58; the inserted joint rib 60 is made of a steel pipe with a diameter of 60 mm.

[0071] The tie bar chute 61 has a height of 12 mm and a width of 10 cm.

[0072] The tie bar slide plate 62 is made of rolled steel plate with a thickness of 10 mm.

[0073] The side form reinforcement 63 adopts a prestressed screw with a diameter of 30 mm.

[0074] The reinforcement bottom plate 64 is made of rolled steel plate with a thickness of 10 mm.

[0075] The embankment step 65 is 0.8m high and 2m wide.

[0076] The transverse tie bars 66 are made of threaded steel bars with a thickness of 25 mm and are connected to the tie bar adjustment bolts 68 through screw holes; the tie bar adjustment bolts 68 include steel pipe screws and bolts with a diameter of 30 mm, and the tightening directions of the screws on both sides of the bolts are opposite.

[0077] The old roadbed soil 67 is clay soil in a hard plastic state.

[0078] The slide plate connecting rib 69 is rolled from a steel pipe with a diameter of 60 mm.

[0079] The vertical pallet 70 is rolled from a steel plate with a thickness of 10 mm, and the pallet bottom plate 78 is welded to the vertical pallet 70, and then the pallet bottom plate 78 is firmly connected to the widened area foundation 55 through the pallet anchor rib 79; the pallet bottom plate 78 is rolled from a steel plate with a thickness of 2 mm, and the pallet anchor rib 79 uses a screw with a diameter of 30 mm.

[0080] The cross section of the card connecting groove 71 is rectangular, with a depth of 10 cm and a width of 10 cm.

[0081] The card plate connecting rib 72 is rolled from a steel pipe with a diameter of 60 mm.

[0082] The oblique reinforcement 73 uses a prestressed screw with a diameter of 30 mm.

[0083] The plate anchor pier 74 is cast with reinforced concrete material, and the concrete strength grade is C30.

[0084] The connecting slide plate 76 is made of a steel plate with a thickness of 10 mm.

[0085] The connecting falcon chute 77 has a depth of 10 mm and a length of 5 cm.

[0086] The built-in connecting rib 80 is rolled from a steel pipe with a diameter of 300 mm.

[0087] The water-retaining geomembrane 81 is a waterproof geomembrane with a thickness of 2 mm.

[0088] The upper sealing layer 82 is made of concrete with a strength grade of C30.

[0089] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art to which the present invention relates, if equivalent substitutions or obvious modifications are made without departing from the concept of the present invention and the performance or use is the same, they should be deemed to fall within the scope of protection defined by the claims submitted by the present invention.

Claims

1. A method for widening and filling a lightweight embankment with large-size construction waste, characterized by: The construction steps include: 1) Construction preparation: On-site survey to determine the location of the embankment steps (65) and prepare the materials and equipment required for construction; 2) Waste crushing: a pressure support frame (2) is arranged on the foundation soil 1), and a pressure device (4) and a pressure plate (5) are arranged on the lower surface of the pressure support frame (2) opposite to the material crushing box (3); a tire frame bottom plate (6) is arranged on the upper surface of the foundation soil (1), and a bottom plate adjustment bolt (7) and an adjustable support pier (8) are arranged between the tire frame bottom plate (6) and the foundation soil (1); along the height direction of the material crushing box (3), a first supporting beam (9), a second supporting beam (10), a first aggregate screen (11), a discharge chute (12) and a drainage chute (13) are arranged in sequence from top to bottom inside the material crushing box (3); between the second supporting beam (10), the first aggregate screen (11), the discharge chute A second discharge hole (14) is reserved at a relative position between the drainage channel (12) and the drainage slide (13) and the material crushing box (3); a first cutting blade (15) and a first limiting side plate (16) are provided on the first supporting beam (9), and a first water sprayer (17) is arranged in a mirror-symmetrical manner on the material crushing box side wall (20) above the first supporting beam (9); a second cutting blade (18) and a second limiting side plate (19) are provided on the second supporting beam (10), and a second water sprayer (21) is arranged in a mirror-symmetrical manner on the material crushing box side wall (20) between the second supporting beam (10) and the first supporting beam (9), and then a first discharge plate (22) is provided at the second discharge hole (14) outside the second supporting beam (10). A blade connecting rod (24) is provided on the lower surface of the slidable blade (23) in the second cutting blade (18), one end of the blade connecting rod (24) is connected to the slidable blade (23), and the other end is connected to the blade slide (25), and a blade slide groove (26) for the blade slide (25) to slide is provided on the outer side of the blade slide (25); a blade connecting rod (27) is provided on the lower surface of the blade slide (25), and different blade connecting rods (27) are connected by a sliding connecting rod (28), and an adjusting bolt (29) is provided at the end of the sliding connecting rod (28) near the second discharge hole (14), and the left and right sliding of the sliding connecting rod (28) is controlled by the adjusting bolt (29); on the first aggregate screen (11) A vibration support (30) is provided at a contact portion of the lower surface with the material crushing box (3), and a second discharge plate (31) is provided at the second discharge hole (14) outside the first aggregate screen (11), and then a first aggregate recovery trough (32) is arranged at the terminal end of the second discharge plate (31); a third discharge hole (33) is provided on the surface of the discharge chute (12) near the second discharge hole (14), and a third discharge plate (34) is provided at the second discharge hole (14) outside the discharge chute (12), and then a second aggregate recovery trough (35) is arranged at the terminal end of the third discharge plate (34); an aggregate guide plate (36) is provided on the side wall (20) of the material crushing box between the first aggregate screen (11) and the discharge chute (12);A fourth discharge plate (37) is provided at the second discharge hole (14) outside the drainage slide (13), and a wastewater recovery tank (38) is arranged at the terminal end of the fourth discharge plate (37); 3) Mix ratio design of waste concrete lightweight backfill: Mix ratio design of waste concrete lightweight backfill (44) includes pretreatment of waste concrete aggregate, preparation of foamed concrete slurry, casting of waste concrete lightweight backfill (44) test blocks, selecting waste concrete aggregates with a mass ratio of 2:4:8:3:3 of five types of aggregates with particle size ranges of 9.5-16 mm, 16-19 mm, 19-26.5 mm, 26.5-31.5 mm, and 31.5-37.5 mm from the second aggregate recovery tank (35), and weighing waste concrete aggregates with a volume ratio of 20%-30%, and then pre-soaking them; forming stable foam in a foaming machine with a foaming agent and test water at a ratio of 1:30-1:50; weighing 800-900 kg / m 3 of cement, and then weigh 440-495kg / m 3 Pour the cement and test water into the mortar mixer and stir for 3 to 4 minutes, then weigh 1.6 to 1.8 kg / m 3 Pour the polypropylene fiber into the mortar mixer and continue stirring for 3 to 4 minutes, then add 40 to 45 kg / m 3 The stable foam is poured into the mortar mixer and stirred for 2 to 3 minutes to form a foamed concrete slurry for use; the pouring is divided into three layers, and the pouring heights are 2 / 5, 2 / 5, and 1 / 5 of the test block mold height respectively. First, the foamed concrete slurry is poured into the test block mold with a size of 150 mm×150 mm×150 mm to the set height, and then the waste concrete aggregate is evenly sprinkled into the test block mold to make it sink under its own weight until the volume remains unchanged. The above steps are followed until the waste concrete lightweight backfill body (44) test block is poured; the waste concrete lightweight backfill body (44) test block is covered with a film, cured indoors at 20±1 ℃ for 24 hours, and then demoulded and placed in a constant temperature water tank for curing for 28 days; 4) Foundation treatment of the roadbed widening area: a widening area foundation (55) is excavated in the foundation soil (1), a hole is bored from the widening area into the widening area foundation (55), and an oblique reinforcement (56) is inserted; a side form foundation (57) is set inside the widening area foundation (55), and a side form support plate (59) is set at the connection between the top of the side form foundation (57) and the side form template (58), and the side form support plate (59) is firmly connected to the side form foundation (57) and the widening area foundation (55) through the inserted reinforcement (60); 5) Side form support: a side form template (58) is set on the upper part of the side form support plate (59), and a tie bar slide (61) is set on the inner wall of the side form template (58), and then a tie bar slide plate (62) that can slide along the tie bar slide (61) is set in the tie bar slide (61); a side form reinforcement (63) is set between the side form template (58) and the widening area foundation (55), and the bottom end of the side form reinforcement (63) is firmly connected to the widening area foundation (55) through the reinforcement bottom plate (64); a transverse reinforcement (66) is set on the embankment step (65), and one end of the transverse reinforcement (66) is anchored to the old roadbed soil (67), the other end is connected to the slide connecting bar (69) through the tie bar adjusting bolt (68), and the position of the transverse tie bar (66) is controlled by the tie bar adjusting bolt (68); a vertical card plate (70) is set between the transverse tie bars (66) in the same vertical plane, and the vertical card plate (70) is firmly connected to the transverse tie bar (66) through the card plate connecting groove (71) and the card plate connecting bar (72); an oblique tie bar (73) is set between the vertical card plate (70) and the old roadbed soil (67), and a card plate anchor pier (74) is set at the connection position between the bottom end of the oblique tie bar (73) and the old roadbed soil (67); 6) Construction of waste concrete lightweight backfill: First, pour 70-80 mm foam concrete slurry on the widened area foundation (55), and then evenly spread waste concrete aggregate with a volume ratio of 20%-30% within 0-1 hour; after the volume of the first layer of waste concrete lightweight backfill (44) is stable, pour foam concrete slurry and waste concrete aggregate from bottom to top, repeat the above operation, and the pouring height is 0.8-1 m, then insert built-in connecting bars (80) on the surface of the waste concrete lightweight backfill (44), let it stand for 12-24 hours, and continue pouring until the pouring is completed after the waste concrete lightweight backfill (44) is initially solidified; after the waste concrete lightweight backfill (44) is initially solidified, cover the top with a water-retaining geomembrane (81); set an upper sealing layer (82) on the uppermost surface of the waste concrete lightweight backfill (44).

2. The method for widening and filling a lightweight embankment with large-size construction waste according to claim 1, characterized in that: Step 2) The pressurizing support frame (2) is made of rolled steel, and screw holes for connecting to the pressurizing device (4) are set on the pressurizing support frame (2); the pressurizing device (4) adopts hydraulic pressure, one end is connected to the pressurizing support frame (2) by welding, and the other end is connected to the pressurizing plate (5) by screw holes, and the pressurizing plate (5) is made of rolled steel plate; the first cutting blade (15) is composed of four fixed blades (39), which are closed rectangular and firmly connected to the side wall (20) of the material crushing box through the first supporting beam (9); the second cutting blade (18) includes a slidable blade (23) and three fixed blades (39), so that the slidable blade (23) The blade connecting rod (24) is welded to the blade slide (25), and the second cutting blades (18) are welded to each other through the blade telescopic rod (40); the cross section of the blade connecting rod (27) is "T"-shaped and is made of rolled steel plate, one end of which is welded to the blade slide (25) and the other end of which is welded to the sliding connecting rod (28); the adjusting bolt (29) includes a screw and a nut, and the tightening directions of the screws on both sides of the nut are opposite; the first water sprayer (17) adopts an energy-saving water sprayer with a vertical inclination angle of 60° to 80°; the second water sprayer (21) adopts a high-strength water sprayer, which is mirror-symmetrically arranged on the side wall (20) of the material crushing box. The vertical inclination angle is 40° to 60°, which can realize secondary crushing of the waste concrete aggregate between the second limiting side plate (19); the first limiting side plate (16) and the second limiting side plate (19) are both made of rolled steel plates, and a first discharge hole (41) for the aggregate to pass through is preset on the second limiting side plate (19); the first aggregate screen (11) adopts a 37.5mm sieve hole; the vibration support (30) adopts mechanical vibration, is firmly connected to the support bottom plate (42) by bolts, and the support bottom plate (42) is welded to the side wall (20) of the material crushing box, and the vibration support (30) assists in the screening of aggregates, and aggregates with a particle size greater than 37.5mm are screened. The aggregate is transported to the first aggregate recovery trough (32) through the first discharge plate (22); the discharge chute (12) is made of rolled steel plate, and the third discharge hole (33) on the surface of the discharge chute (12) has a hole diameter of 9.5 mm. Aggregates with a particle size larger than 9.5 mm are transported to the second aggregate recovery trough (35) through the third discharge plate (34); the discharge chute (12) and the drainage chute (13) are both arranged obliquely downward, with the inclination angle controlled at 20° to 40°. Aggregates and wastewater with a particle size smaller than 9.5 mm are transported to the wastewater recovery trough (38) through the drainage chute (13), and a second aggregate screen (43) for aggregate sedimentation is arranged in the wastewater recovery trough (38).

3. The method for widening and filling a lightweight embankment with large-size construction waste according to claim 2, characterized in that: Step 3) The waste concrete lightweight backfill (44) is prepared from waste concrete aggregate and foamed concrete paste; the foamed concrete paste is prepared from cement, test water, stabilized foam and polypropylene fiber; the cement is ordinary Portland cement; the polypropylene fiber has a length of 12 to 19 mm; the foaming agent is a composite foaming agent with a foaming multiple of more than 20 times; the waste concrete aggregate needs to be soaked in the test water for 20 to 40 minutes, taken out and drained until there is no visible water on the surface.

4. The method for widening and filling a lightweight embankment with large-size construction waste according to claim 1, characterized in that: Step 4) The widening area foundation (55) is made of lightweight consolidated soil with a rectangular cross section; the oblique reinforcement (56) is made of rolled steel pipe or steel section, and the horizontal inclination angle is controlled at 50° to 70°; the side form foundation (57) is made of prefabricated pier with a trapezoidal cross section; the side form support plate (59) is made of rolled steel plate, the lower surface of the side form support plate (59) is connected to the side form foundation (57) and the widening area foundation (55) through the inserted joint reinforcement (60), and the upper surface is welded to the side form template (58).

5. The method for widening and filling a lightweight embankment with large-size construction waste according to claim 4, characterized in that: Step 5) The side formwork (58) is made of precast concrete slabs or steel plates, and different side formworks (58) are firmly connected by template connecting falcons (75) with a trapezoidal cross section, and the upper surface of the template connecting falcon (75) is welded to the side formwork (58), and the lower surface is connected to the connecting falcon slide plate (76) through a nut, and a connecting falcon slide groove (77) for sliding the connecting falcon slide plate (76) is provided on the outside of the connecting falcon slide plate (76); the side formwork reinforcement (63) is made of threaded steel bars or screws; the vertical card plate (70) is made of rolled steel plates, and the card plate bottom plate (78) is welded to the vertical card plate (70), and then the card plate bottom plate (78) is firmly connected to the widening area foundation (55) through the card plate anchor bar (79); the transverse tie bar (66) is made of threaded steel bars and is connected to the tie bar adjustment bolt (68) through a screw hole.

6. The method for widening and filling a lightweight embankment with large-size construction waste according to claim 3 or 5, characterized in that: Step 6) The built-in connecting reinforcement (80) is made of threaded steel bars, and a connecting thread is provided inside the built-in connecting reinforcement (80); and the upper closed layer (82) is cast in concrete.

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