Subgrade structure based on shallow replacement

Abstract

The utility model discloses a kind of subgrade structures based on shallow replacement, subgrade structure includes subgrade, soil backfill, adverse soil layer, pavement structure layer, cement soil and cinder, wherein, subgrade includes ground, grassed slope protection, sidewalk, motorway, non-motorway, side strip, carriageway, middle strip and green belt, subgrade is corresponding pavement planning design, corresponding shallow replacement is replaced by pavement planning collocation, both complement each other, common enhance the service life and actual use effect of subgrade structure, soil backfill and cement soil need to guarantee maintenance work in construction process.This based on shallow replacement subgrade structure can realize using common construction material combination into higher compressive strength subgrade structure to enhance service life, and have certain resistance to environmental change, material strength remains stable.

Description

Technical Field

[0001] The embodiments of this utility model belong to the field of municipal engineering technology, and more specifically, relate to a roadbed structure based on shallow replacement. Background Technology

[0002] In the construction of infrastructure such as highways and municipal works, the roadbed is the core foundation that bears the superstructure and traffic loads. Its stability directly determines the quality and service life of the project. In alluvial plains, floodplains, mountain valleys and other areas, there are often silty soft soil, collapsible loess or miscellaneous fill layers with high burial depth. These soil layers have high natural water content, large void ratio and low compressive strength. The characteristic value of the foundation bearing capacity is generally low and far from meeting the design requirements of the roadbed. This can easily lead to post-construction settlement, cracking or even collapse.

[0003] Currently, shallow replacement technology has become a mature method for treating shallow soft foundations in roadbed engineering. Its core process involves excavating the soft soil within a specified depth and backfilling and compacting it in layers using stable materials such as graded gravel, crushed stone, hard rock chips, or improved soil. During construction, it is necessary to strictly follow the specifications for layered filling, layered compaction, and layered testing. To improve the treatment effect, some schemes will introduce reinforcing components such as geocells to distribute the load by enhancing the lateral confinement effect. In terms of material selection, in addition to traditional natural aggregates, recycled materials from construction waste and improved soil are also gradually being used.

[0004] The existing shallow replacement technology still has significant defects: (1) If a single layer of soft rock is used for replacement, the service life is easily shortened due to insufficient compressive strength, while excessively increasing the material strength requirements will lead to a reduction in available resources and make it difficult to take advantage of local material availability; (2) Traditional homogeneous filler replacement layers are prone to particle loss or strength reduction under the environmental effects of groundwater infiltration, freeze-thaw cycles and other factors. Summary of the Invention

[0005] To address the aforementioned deficiencies or improvement needs of existing technologies, this utility model provides a roadbed structure based on shallow replacement. The roadbed layout follows a sequence: from sidewalk to non-motorized vehicle lane, from non-motorized vehicle lane to side median strip, from side median strip to carriageway, from carriageway to median strip, from median strip to carriageway, from carriageway to side median strip, from side median strip to non-motorized vehicle lane, and from non-motorized vehicle lane to sidewalk. Simultaneously with the widening of the sidewalk, non-motorized vehicle lane, and carriageway, cement-soil and slag are used for replacement, enhancing the compressive strength and environmental resistance of the corresponding roadbed.

[0006] To achieve the above objectives, this utility model provides a roadbed structure based on shallow replacement, comprising: The roadbed, the unfavorable soil layer located at the base of the roadbed, the rough surface structure layer located on top of the unfavorable soil layer, the cement-soil connected to the bottom of the rough surface structure layer, and the slag located at the bottom of the cement-soil. The unfavorable soil layer, after construction and backfilling, consists of a rough structural layer, cement soil, and slag.

[0007] Furthermore, the roadbed includes the outermost sidewalks on both sides of the roadbed, the non-motorized vehicle lanes on the inner side of the sidewalks, the side medians on the inner side of the non-motorized vehicle lanes, the carriageways connected to the inner side of the side medians, and the center medians connected to the carriageways on both sides.

[0008] Furthermore, the pedestrian walkways, non-motorized vehicle lanes, and vehicle lanes need to be widened.

[0009] Furthermore, the bottom of the pedestrian walkway and non-motorized vehicle lane needs to be replaced with 0.3m of cement soil and 0.5m of slag.

[0010] Furthermore, the cement-soil replacement and slag replacement are carried out in layers and by layered compaction.

[0011] Furthermore, the roadbed also includes the ground located on the outermost and middle parts of the roadbed, a grassed slope on the outer side of the ground, a sidewalk connected to the grassed slope on one side, a non-motorized vehicle lane connected to the other side of the sidewalk on one side, a green belt connected to the other side of the non-motorized vehicle lane on one side, a motorized vehicle lane connected to the green belt on one side, and the ground located between the two motorized vehicle lanes. Furthermore, it also includes soil backfill located beneath the roadbed.

[0012] Furthermore, the sidewalk is backfilled with soil on its outer side, the non-motorized vehicle lane is backfilled with soil between it and the vehicle lane, and the median strip is backfilled with soil on both sides.

[0013] Furthermore, the bottom of the sidewalk and non-motorized vehicle lane is backfilled with soil, and the bottom of the motorized vehicle lane and the ground is replaced with cement soil and slag.

[0014] Furthermore, the backfill is carried out using 0.3m of 6% cement-soil mixture.

[0015] In summary, compared with the prior art, the above-described technical solution conceived by this utility model can achieve the following beneficial effects: 1. The roadbed structure of this utility model has a roadbed layout from the sidewalk to the non-motorized vehicle lane, from the non-motorized vehicle lane to the side median strip, from the side median strip to the carriageway, from the carriageway to the center median strip, from the center median strip to the carriageway, from the carriageway to the side median strip, from the side median strip to the non-motorized vehicle lane, and from the non-motorized vehicle lane to the sidewalk. While widening the sidewalk, non-motorized vehicle lane, and carriageway, cement soil and slag are also used for replacement filling, which enhances the compressive strength and environmental resistance of the corresponding roadbed.

[0016] 2. The roadbed structure of this utility model is laid out as follows: grass slope protection to sidewalk, sidewalk to non-motorized vehicle lane, non-motorized vehicle lane to green belt, green belt to motorized vehicle lane, motorized vehicle lane to ground, ground to motorized vehicle lane, motorized vehicle lane to green belt, green belt to non-motorized vehicle lane, non-motorized vehicle lane to sidewalk, sidewalk to grass slope protection, and grass slope protection to ground. Soil backfilling is carried out at the bottom of the sidewalk and non-motorized vehicle lane, and layered replacement and compaction of cement soil and slag are carried out at the bottom of the motorized vehicle lane and the middle ground. Attached Figure Description

[0017] Figure 1 This is a detailed drawing of the roadbed structure based on shallow replacement according to an embodiment of the present invention; Figure 2 This is a design drawing for the treatment of unfavorable soil layers in a roadbed structure based on shallow replacement, according to an embodiment of this utility model. Figure 3 This is a shallow replacement design drawing for a roadbed structure based on shallow replacement, according to an embodiment of this utility model.

[0018] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-soil backfill, 2-unfavorable soil layer, 3-slightly structural layer, 4-cement soil, 5-slag, 6-ground surface, 7-grass-vegetated slope protection, 8-sidewalk, 9-motor vehicle lane, 10-non-motor vehicle lane, 11-side median strip, 12-roadway, 13-median strip, 14-green belt. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0020] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0023] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] According to one embodiment of this disclosure, a roadbed structure based on shallow replacement is provided, such as... Figure 1 As shown, the roadbed includes a roadbed and backfill 1. The roadbed includes a sidewalk 8, a non-motorized vehicle lane 10, a side median strip 11, a carriageway 12, and a central median strip 13. Backfill 1 is constructed on each roadbed section. Backfill 1 is located below the roadbed and is constructed on the outer side of each sidewalk 8. Backfill 1 is also constructed between the non-motorized vehicle lane 10 and the carriageway 12. At the same time, backfill 1 is constructed on both sides of the central median strip 13. The sidewalk 8 is located on the outermost sides of the roadbed. The non-motorized vehicle lane 10 is located on the side inward of the sidewalk 8. The side median strip 11 is located on the side inward of the non-motorized vehicle lane 10, and the carriageway 12 is located on the side inward of the side median strip 11. The central median strip 13 connects to the carriageway 12 on both sides. This roadbed structure design can better meet the requirements of the construction for long-term use of the road surface and to ensure smooth and convenient traffic.

[0025] Specifically, such as Figure 2As shown, the unfavorable soil layer 2 includes a slightly sloping structure layer 3, cement-soil 4, and slag 5. The unfavorable soil layer 2 is located at the bottom of the roadbed, the slightly sloping structure layer 3 is located at the top of the unfavorable soil layer 2, the cement-soil 4 is located at the bottom of the slightly sloping structure layer 3, and the slag 5 is located at the bottom of the cement-soil 4. The replacement of cement-soil 4 and slag 5 is carried out by layered replacement and layered compaction. After each layer of weak soil is excavated, a corresponding layer of cement-soil 4 and slag 5 is backfilled. Immediately after backfilling, the cement-soil 4 and slag 5 are compacted with a road roller or other equipment until the compaction degree meets the design requirements. Then, the next layer of replacement and compaction is carried out. By carrying out the corresponding layered replacement and layered compaction treatment on the unfavorable soil layer 2, the compressive strength and environmental resistance of the roadbed after replacement can be enhanced.

[0026] like Figure 1 , Figure 2 As shown, in this embodiment, the sidewalk 8 and the non-motorized vehicle lane 10 are widened and their bottoms are replaced with 0.3m of cement soil 4 and 0.5m of slag 5. The carriageway 12 is widened and its bottoms are replaced with 0.5m of cement soil 4 and 0.5m of slag 5.

[0027] The roadbed structure of this utility model has a roadbed layout that extends from the sidewalk to the non-motorized vehicle lane, from the non-motorized vehicle lane to the side median strip, from the side median strip to the carriageway, from the carriageway to the center median strip, from the center median strip to the carriageway, from the carriageway to the side median strip, from the side median strip to the non-motorized vehicle lane, and from the non-motorized vehicle lane to the sidewalk. While widening the sidewalk, non-motorized vehicle lane, and carriageway, cement soil and slag are also used for replacement filling, which enhances the compressive strength and environmental resistance of the corresponding roadbed.

[0028] According to another embodiment of this disclosure, a roadbed structure based on shallow replacement is provided, such as... Figure 3 As shown, the structure includes a roadbed, soil backfill 1, cement-soil 4, and slag 5. The roadbed includes a ground surface 6, grassed slope protection 7, sidewalk 8, motor vehicle lane 9, non-motor vehicle lane 10, and green belt 14. The ground surface 6 is located on the outermost and middle sides of the roadbed structure. Grassed slope protection 7 is set on the outermost side of the ground surface 6. One side of the sidewalk 8 is connected to the grassed slope protection 7 on both sides. One side of the non-motor vehicle lane 10 is connected to the other side of the sidewalk 8. One side of the green belt 14 is connected to the other side of the non-motor vehicle lane 10. One side of the motor vehicle lane 9 is connected to the other side of the green belt 14. The ground surface 6 is set in the middle of the two motor vehicle lanes 9. Soil backfill 1 is carried out at the bottom of the sidewalk 8 and the non-motor vehicle lane 10. Cement-soil 4 and slag 5 are replaced and compacted in layers at the bottom of the motor vehicle lane 9 and the middle ground surface 6.

[0029] Specifically, such as Figure 3As shown, the backfilling 1 at the bottom of the sidewalk 8 and the non-motorized vehicle lane 10 is carried out by using 0.3m of 6% cement soil 4. The layered replacement and compaction of cement soil 4 and slag 5 at the bottom of the motorized vehicle lane 9 and the middle ground 6 is carried out by using 0.8m of 6% cement soil 4 and slag 5.

[0030] The roadbed structure of this utility model is laid out as follows: grass slope protection to sidewalk, sidewalk to non-motorized vehicle lane, non-motorized vehicle lane to green belt, green belt to motorized vehicle lane, motorized vehicle lane to ground, ground to motorized vehicle lane, motorized vehicle lane to green belt, green belt to non-motorized vehicle lane, non-motorized vehicle lane to sidewalk, sidewalk to grass slope protection, and grass slope protection to ground. Soil backfilling is carried out at the bottom of the sidewalk and non-motorized vehicle lane, and layered replacement and compaction of cement soil and slag are carried out at the bottom of the motorized vehicle lane and the middle ground.

[0031] For the roadbed structures based on shallow replacement in the above embodiments, the filling material must be filled in accordance with the requirements in detail. The filling material table is as follows: It is necessary to ensure that the complete road construction process is followed during actual construction, from road slab breaking to roadbed excavation, from roadbed excavation to roadbed treatment, from roadbed treatment to base course construction, from base course construction to curbstone construction, from curbstone construction to surface course construction, and from surface course construction to sidewalk construction.

[0032] During the construction of the roadbed, priority should be given to clearing the original ground and breaking up the road slabs. Bulldozers and excavators should be used to remove existing road attachments, garbage, tree roots and other debris, which should be loaded onto trucks and transported to designated disposal sites. According to the design and construction drawings, existing ditches should be cleared of silt and debris from the bottom and backfilled and leveled to meet the requirements. After clearing the surface, the roadbed should be sloped in a certain direction towards drainage to ensure that the site does not accumulate water. Drainage ditches and collection wells should be excavated along both sides of the road within the construction site. Where possible, the drainage ditches should be connected to the existing ditches for natural drainage. Drilling machines should be used to drill holes in the existing concrete or asphalt road to facilitate the subsequent excavation and construction of the original road surface structure.

[0033] Following this, roadbed excavation and transportation will be carried out in a segmented and continuous manner, while meeting the requirements of the existing transportation. The construction sequence is as follows: first, construction surveying and setting out; then, manual and mechanical clearing of topsoil and vegetation in sections; then, demolition of the existing road; then, mechanical pushing, excavation, and loading; then, transport vehicles to remove the slag; and finally, slope and base surface finishing. Excavation must be carried out in strict accordance with construction specifications and design requirements.

[0034] In another embodiment of this utility model, a roadbed structure based on shallow replacement is provided, comprising the following steps: Bulldozers and excavators were used to remove existing road attachments, garbage, tree roots, and other debris, which were then loaded onto trucks and transported to designated disposal sites.

[0035] The excavation adopts the "longitudinal excavation method", and the excavation is carried out in layers from top to bottom. The excavated base surface is leveled and compacted. If the soil properties are found to change during the excavation process, the construction plan should be modified.

[0036] Shallow replacement treatment is carried out on the roadbed at different mileage markers and in different locations. Bulldozers are used in conjunction with manual labor for construction. After the excavation width and depth at the bottom of the road meet the design requirements, the replacement layer can be compacted by a road roller.

[0037] The replacement of slag 5 and cement-soil 4 is carried out by layered replacement and layered compaction. The cement-soil 4 replacement is carried out by on-site mixing. Soil backfill 1 and cement-soil 4 should be mixed evenly.

[0038] In summary, this roadbed structure based on shallow replacement can utilize common construction materials to create a roadbed structure with higher compressive strength to enhance service life, while also having a certain resistance to environmental changes and maintaining stable material strength.

[0039] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A roadbed structure based on shallow replacement, characterized in that, include: The roadbed, the unfavorable soil layer (2) located at the bottom of the roadbed, the surface structure layer (3) located on top of the unfavorable soil layer (2), the cement soil (4) connected to the bottom of the surface structure layer (3), and the slag (5) located at the bottom of the cement soil (4). The unfavorable soil layer (2) is composed of a rough surface structure layer (3), cement soil (4) and slag (5) after construction backfilling.

2. The roadbed structure based on shallow replacement according to claim 1, characterized in that, The roadbed includes the outermost sidewalk (8) on both sides of the roadbed, the non-motorized vehicle lane (10) on the inner side of the sidewalk (8), the side median (11) on the inner side of the non-motorized vehicle lane (10), the carriageway (12) connected to the inner side of the side median (11), and the center median (13) connected to the carriageways (12) on the left and right sides.

3. A roadbed structure based on shallow replacement according to claim 2, characterized in that, The pedestrian walkway (8), non-motorized vehicle lane (10) and vehicle lane (12) need to be widened.

4. A roadbed structure based on shallow replacement according to claim 3, characterized in that, The bottom of the pedestrian walkway (8) and the non-motorized vehicle lane (10) needs to be replaced with 0.3m of cement soil (4) and 0.5m of slag (5).

5. A roadbed structure based on shallow replacement according to claim 4, characterized in that, The cement-soil (4) replacement and the slag (5) replacement are carried out by layered replacement and layered compaction.

6. A roadbed structure based on shallow replacement according to claim 5, characterized in that, The roadbed also includes the ground (6) located on the outermost and middle parts of the roadbed, a grassed slope (7) located on the outer side of the ground (6), a sidewalk (8) connected to the grassed slope (7) on one side, a non-motorized vehicle lane (10) connected to the other side of the sidewalk (8) on one side, a green belt (14) connected to the other side of the non-motorized vehicle lane (10) on one side, a motorized vehicle lane (9) connected to the green belt (14) on one side, and the ground (6) located between the two motorized vehicle lanes (9).

7. A roadbed structure based on shallow replacement according to any one of claims 1-6, characterized in that, It also includes soil backfill (1) located below the roadbed.

8. A roadbed structure based on shallow replacement according to claim 2, characterized in that, The sidewalk (8) is provided with soil backfill (1) on the outside, the non-motorized vehicle lane (10) and the vehicle lane (12) are provided with soil backfill (1), and the median strip (13) is provided with soil backfill (1) on both sides.

9. A roadbed structure based on shallow replacement according to claim 6, characterized in that, The bottom of the sidewalk (8) and the non-motorized vehicle lane (10) is provided with soil backfill (1), and the bottom of the motorized vehicle lane (9) and the ground (6) is provided with cement soil (4) and slag (5) for replacement.

10. A roadbed structure based on shallow replacement according to claim 9, characterized in that, The backfill (1) is carried out using 0.3m of 6% cement soil (4).

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