CN112982049A - Foam light soil composite roadbed construction method for road extension - Google Patents
Foam light soil composite roadbed construction method for road extension Download PDFInfo
- Publication number
- CN112982049A CN112982049A CN202011641536.3A CN202011641536A CN112982049A CN 112982049 A CN112982049 A CN 112982049A CN 202011641536 A CN202011641536 A CN 202011641536A CN 112982049 A CN112982049 A CN 112982049A
- Authority
- CN
- China
- Prior art keywords
- pouring
- roadbed
- protective wall
- layer
- foam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002689 soil Substances 0.000 title claims abstract description 65
- 239000002131 composite material Substances 0.000 title claims abstract description 41
- 238000010276 construction Methods 0.000 title claims abstract description 33
- 239000006260 foam Substances 0.000 title claims abstract description 33
- 230000001681 protective effect Effects 0.000 claims abstract description 41
- 239000004567 concrete Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000009412 basement excavation Methods 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 47
- 238000004873 anchoring Methods 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 15
- 239000002356 single layer Substances 0.000 claims description 9
- 239000011381 foam concrete Substances 0.000 claims description 6
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 5
- 239000010779 crude oil Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 239000004575 stone Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004746 geotextile Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 229910001335 Galvanized steel Inorganic materials 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011456 concrete brick Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008397 galvanized steel Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005923 long-lasting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a construction method of a foam light soil composite roadbed for road extension, which is characterized by comprising the following steps: step excavation is carried out on the original roadbed so that a plurality of steps are formed on one side of the original roadbed; pouring protective wall foundation concrete and embedding angle steel upright posts on one side of the original roadbed in the direction in which the steps are arranged; building aerated concrete on the protective wall to form the protective wall; laying an anti-seepage geomembrane at a position between the original roadbed and the protective wall; manufacturing foam light soil on site, and performing layered pouring construction in each pouring process in sequence, wherein after the pouring of each layer of foam light soil is finished, a layer of metal mesh is covered on the surface of each layer of foam light soil; and laying an impermeable geomembrane on the top surface of the foamed light soil. According to the construction method, the foamed light soil is used as a road expansion material, so that differential settlement of a new roadbed and an old roadbed can be reduced, the overall stability of a crude oil roadbed and an expansion roadbed is improved, the durability of an expansion structure is enhanced, and the land resource occupation is reduced.
Description
Technical Field
The invention relates to the field of engineering, in particular to a construction method of a foam light soil composite roadbed for road extension.
Background
With the rapid development of economic society and the increase of traffic volume, the actual traffic volume of many roads is far beyond the designed traffic volume, the service level is reduced, the safety accidents are increased, and the road reconstruction and expansion project is imminent. The old road needs to be widened in the reconstruction and expansion of the road, so that a large amount of land is occupied, the use functions of the land on two sides of the original road are affected, a large amount of earthwork is consumed in the filling of the new road, the construction period is long, the waste of land resources is caused, the probability that the old road and the new road are spliced and subjected to differential settlement is high, and the use performance of the road surface is seriously affected.
Disclosure of Invention
In order to avoid the settlement of the expanded road, the invention provides a construction method of a foam light soil composite roadbed for road expansion, which utilizes the foam light soil as a road expansion material, can reduce the differential settlement of a new roadbed and an old roadbed, improve the integral stability of a crude oil roadbed and an expanded roadbed, enhance the durability of an expanded structure and reduce the occupation of land resources.
Correspondingly, the invention provides a construction method of a foam light soil composite roadbed for road extension, which comprises the following steps:
carrying out step excavation on an original roadbed so as to form a plurality of steps on one side of the original roadbed;
pouring protective wall foundation concrete and embedding angle steel upright posts on one side of the original roadbed in the set direction of the steps, and embedding vertical support posts after the pouring of the protective wall foundation concrete is finished;
building aerated concrete on the basis of the protective wall to form the protective wall;
vertically inserting an anchoring part on the step of the original roadbed;
laying an anti-seepage geomembrane at a position between the original roadbed and the protective wall;
dividing a plurality of pouring areas along the trend of the original roadbed, wherein each pouring area is divided into a plurality of pouring layers;
manufacturing foam light soil on site, and performing layered pouring construction in each pouring process in sequence, wherein after the pouring of each layer of foam light soil is finished, a layer of metal mesh is covered on the surface of each layer of foam light soil;
and paving an anti-seepage geomembrane on the top surface of the foamed light soil.
In an optional embodiment, before the concrete for the protective wall foundation is poured, a cushion layer is laid based on the distance of the road to be expanded;
and the protective wall foundation concrete is poured on the cushion layer.
In an alternative embodiment, the laying of impermeable geomembrane in the position between the original subgrade and the protective wall comprises:
and (3) performing foam concrete covering and pouring on the surface of the cushion layer, and then paving the anti-seepage geomembrane.
In an alternative embodiment, the impermeable geomembrane laying comprises:
the impermeable geomembrane is wrapped by a preset length upwards along the protective wall;
when the geomembrane is laid at the bottom, the stretching and retracting amount is reserved according to 2-5%.
In an alternative embodiment, the top surface area of a single casting area does not exceed 400m2。
In an optional embodiment, the in-situ production of the foamed lightweight soil and the sequential layered casting construction in each casting step include:
setting a settlement joint between adjacent pouring areas by using a wooden splint, and filling a polystyrene plate on the section;
the thickness of the single-layer pouring layer is controlled to be 0.3 m-1.0 m, and the single-layer pouring layer in each pouring area is poured at one time.
In an optional implementation manner, in the pouring process of the foamed lightweight soil, the discharge port of the pouring tube is located below the current pouring surface or the distance between the discharge port of the pouring tube and the current pouring surface is not higher than 1.5 m.
In an optional embodiment, in the process of pouring the foamed lightweight soil, if the stagnation time of the pouring process exceeds 30 minutes, the pouring pipeline needs to be cleaned.
In an optional embodiment, the metal net is anchored based on a U-shaped nail when being laid;
the longitudinal anchoring distance of the U-shaped nail is 2m, and the transverse anchoring distance is 1 m.
The embodiment of the invention provides a construction method of a foam light soil composite roadbed for road extension, which is characterized in that compared with the traditional road reconstruction and extension mode, foam light soil is adopted as a main material for extension and filling; the light weight property of the composite material can effectively reduce the differential settlement of the new road structure and the old road structure, the self-supporting property and the self-compaction property of the composite material can reduce the land area occupied by the slope of the splicing width part in the two directions and the outside, and meanwhile, the composite material is easy to construct and free from rolling; the light soil composite roadbed structure adopts anchoring and metal net reinforcement to improve the overall stability of the widening structure; the light type extension foundation bed is provided with the protection wall on the outer side, so that the functions of protecting the extension structure, preventing the light type extension foundation bed from being weathered and improving the structural durability are achieved, and the attractiveness of a road can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 shows a schematic view of a composite subgrade longitudinal section structure according to an embodiment of the invention;
fig. 2 shows a schematic view of a cross-sectional structure of a roadbed according to an embodiment of the invention;
fig. 3 shows a flow chart of the construction method of the foam lightweight soil composite roadbed for road extension.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For ease of understanding, a roadbed structure constructed by the method for constructing a foamed lightweight soil composite roadbed for road extension will be described first.
Fig. 1 shows a schematic view of a composite subgrade longitudinal section structure according to an embodiment of the invention;
fig. 2 shows a schematic diagram of a cross-sectional structure of a roadbed according to the embodiment of the invention.
Specifically, the embodiment of the invention provides a composite roadbed structure, which comprises an original roadbed 6, a protective wall 1, a protective wall foundation 2, an extension foundation bed 3 and a metal mesh 4;
the edge of the original roadbed 6 is provided with a plurality of stages of steps which gradually sink along the extension direction of the roadbed; the protective wall 1 is arranged on one side of the original roadbed 6 in the expansion direction, and the protective wall 1 is fixed on the protective wall foundation 2;
anchoring parts 5 are arranged on each stage of the original roadbed 6, the extension foundation bed 3 is fully arranged between the original roadbed 6 and the protective wall 1, and the extension foundation bed 3 is connected with the anchoring parts 5;
the metal nets 4 are embedded into the extension foundation bed 3 along the horizontal direction, and the top surface and the bottom surface of the extension foundation bed 3 are respectively provided with an impermeable geomembrane 7.
The composite roadbed structure provided by the embodiment of the invention firstly utilizes the original roadbed as a bearing surface, improves the contact area between the roadbed and the extension foundation bed in a step processing mode, changes the acting force direction between the original roadbed and the extension foundation bed, and is assisted by the anchoring part, so that the original roadbed and the extension foundation bed are not easy to separate and generate settlement; the arrangement of the metal net 4 can increase the tensile capacity of the extension foundation bed, and further prevent the separation between the original roadbed and the extension foundation bed.
In an optional embodiment, the descending gradient of the plurality of steps gradually sinking is 1:1.5, and the width of the step is 1.2 m.
In an alternative embodiment, the extension foundation 3 is made of foamed light soil.
In an alternative embodiment, the material of the protective wall foundation 2 is C30 concrete. The protective wall foundation 2 is connected with the protective wall 1 through the mortar. The protective wall 1 is formed by longitudinally and alternately building aerated concrete blocks 8, angle steel upright posts and transverse connecting pieces are used as integral connecting supports, aerated concrete is connected through building mortar, and the aerated concrete blocks are cuboid and 60cm x 10cm x 20cm in length, width and height.
In an optional embodiment, the anchoring part 5 is a steel bar, specifically, the diameter of the steel bar is 30mm, the length of the steel bar is 1.2m, the anchoring part is inserted into each step, the vertical depth of the steel bar inserted into the step is 60cm, and the steel bar is arranged at a longitudinal interval of 200 cm.
In an optional embodiment, the metal mesh 4 is a galvanized metal mesh, and the galvanized steel wire mesh is a galvanized wire mesh with a diameter of 1.5mm @2.5cm × 2.5 cm.
In an alternative embodiment, the impermeable geomembrane is a HDPE impermeable geomembrane.
In an optional implementation mode, the cushion layer 9 is a gravel cushion layer, and the gravel gradation is good and meets the standard requirement.
The composite roadbed structure provided by the embodiment of the invention firstly utilizes the original roadbed as a bearing surface, improves the contact area between the roadbed and the extension foundation bed in a step processing mode, changes the acting force direction between the original roadbed and the extension foundation bed, and is assisted by the anchoring part, so that the original roadbed and the extension foundation bed are not easy to separate and generate settlement; the arrangement of the metal net 4 can increase the tensile capacity of the extension foundation bed, and further prevent the separation between the original roadbed and the extension foundation bed.
Fig. 3 shows a flow chart of a construction method of the foam lightweight soil composite roadbed for road extension according to the embodiment of the invention.
Correspondingly, the invention provides a construction method of a foam light soil composite roadbed for road extension, which comprises the following steps:
s101: construction preparation;
specifically, before road extension construction, the foundation needs to be guaranteed to be flat and free of accumulated water, rolling is carried out before filling, the foundation is guaranteed to have enough bearing capacity, the bearing capacity of the foundation is guaranteed to be not less than 80kpa, and meanwhile, the surface cleaning treatment is carried out on the original roadbed structure 6.
S102: carrying out step excavation on an original roadbed so as to form a plurality of steps on one side of the original roadbed;
specifically, the excavation width of each stage is more than 1m
S103: paving a cushion layer;
specifically, the cushion layer is a laying object outside the original roadbed and on the foundation position from the original roadbed to the edge position of the road to be expanded, before the cushion layer is laid, the subbase layer is firstly subjected to reinspection and measurement and trimming, parameters such as the plane size, the elevation and the bearing capacity of the foundation need to be measured and meet the design requirements, and the foundation is ensured to have no accumulated water, no sundries and no soft soil. When the broken stone cushion is paved, the influence of the underground water level of the roadbed and the transportation load capacity on the original ground of the roadbed is considered, the broken stone is paved by adopting a propulsion method, namely, the prepared broken stone is transported to the starting point of the section to be treated by a transport vehicle, and the bulldozer is used for gradually propelling the operation. Before paving, uniformly driving a wooden pile (or bamboo sheet) at the position of 10m interval on the original ground of the roadbed to control the construction and paving thickness, and dispatching a specially-assigned person to follow up for inspection. And (5) rechecking the filling thickness of the crushed stones by using a level gauge after leveling and compacting.
Furthermore, the broken stone cushion layer should be paved according to the areas of the foam light soil pouring area. Before paving, 10 multiplied by 10m grid elevation piles are preset on the subbase layer so as to facilitate visual control of the thickness in the gravel paving process. And reserving a groove with the width of 2-3 cm and the depth of 2-3 cm for the boundary position of the pouring area so as to facilitate the installation of the temporary template during pouring of the light soil.
S104: pouring concrete on a protection wall foundation and embedding angle steel upright posts, and building aerated concrete on the protection wall foundation to form a protection wall;
pouring protective wall foundation concrete and embedding angle steel upright posts on one side of the original roadbed in the set direction of the steps, and embedding vertical support posts after the pouring of the protective wall foundation concrete is finished; the foundation pouring is leveled, the vertical support columns are embedded in time after the pouring is finished, the spacing between the embedding positions of the angle steels is accurate, and meanwhile, the verticality is guaranteed; the method comprises the steps of longitudinally and alternately stacking aerated concrete blocks, timely installing a transverse connecting piece, wherein the aerated concrete blocks are carried out according to the principle of along with pouring and along with building, pouring a layer of foam concrete for each aerated concrete block with a certain height, and the building height of each aerated concrete block is the height of layered pouring of the foam concrete.
S105: vertically inserting an anchoring part on the step of the original roadbed;
s106: laying an anti-seepage geomembrane at a position between the original roadbed and the protective wall;
because the cushion layer is a broken stone cushion layer, the surface of the cushion layer is covered and poured by adopting preferably foamed light soil before paving, and then the geotextile is paved, so that the geotextile is prevented from being punctured and damaged; specifically, the HDPE impermeable geomembranes are arranged at the bottom and the top of the foamed light soil, the HDPE impermeable geomembranes wrap the periphery of the foamed light soil along the protective wall by 1 meter upwards along the bottom of the foamed light soil, and the HDPE impermeable geomembranes wrap the periphery of the top of the foamed light soil by 0.5 meter downwards; optionally, the HDPE impermeable geomembrane adopts a double-welding-seam hot-melting welding process, the width of the welding seam is 2.5cm, and the overlapping length of the geomembrane is not less than 5 cm; specifically, considering that the deformation of the foundation is large, the stretching and retracting amount is reserved according to 2-5% when the geomembrane is laid at the bottom.
S107: dividing a plurality of pouring areas along the trend of the original roadbed, wherein each pouring area is divided into a plurality of pouring layers;
the dividing requirements of the pouring area comprise: when the longitudinal and transverse dimensions of the roadbed are larger, the top surface area of a single pouring area should not exceed 400m at most2300m is selected in the invention2(ii) a The length of the single pouring area in the long axis direction is 10-20 m; the dividing requirements of the pouring layer comprise: the thickness of the single layer is preferably 0.3-1.0m, the thickness of the single layer is 100cm in the embodiment, and the position where the steel-plastic geogrid is laid is a layered interface of a casting layer.
S108: pouring foam concrete;
specifically, the cautions of the foam concrete pouring construction include:
setting a pouring area every 10-15 m along the longitudinal direction of the line for the foamed light soil slope filled roadbed, setting a settlement joint for the adjacent pouring areas by using a wooden clamp plate with the thickness of 1.8CM, and filling a polystyrene plate with the thickness of 2CM on the full section;
the thickness of the single-layer pouring layer is preferably controlled to be 0.3 m-1.0 m, and the single-layer pouring layer in each pouring area is poured at one time;
in the casting process, the discharge port of the casting tube is arranged below the current casting surface as much as possible, and the distance between the discharge port of the casting tube and the current casting surface is not higher than 1.5m under other conditions such as a flat surface sweeping condition and the like;
if the standing time exceeds 30 minutes in the pouring process, the pipeline is cleaned in time, and the clean water discharged from the pipeline is taken as the standard when the conveying pipe is cleaned;
disturbance to the foamed light soil is reduced in the pouring process, the foamed light soil is not required to move randomly, and the pouring pipe is moved as little as possible;
when the top layer is poured, the pouring pipe is dragged in a retreating mode to be manually swept flat, and the pouring construction of the upper layer can be carried out after the final setting and hardening of the lower pouring layer;
when the weather is heavy rain, heavy rain or long-lasting light rain, the surface of the unhardened foam light soil is subject to rain shielding measures;
when the temperature is not lower than 15 ℃ in the construction period, the shortest pouring interval time can be controlled according to 8-12 hours; otherwise, the pouring interval time is not less than 2 days;
when the temperature is lower than 5 ℃, the construction is stopped; effective heat preservation and maintenance measures are adopted in low-temperature construction;
after the top surface of the foam lightweight soil pouring area is poured to a designed height, the lightweight soil roadbed is subjected to moisture preservation and maintenance, the maintenance can be carried out in a mode of covering non-woven geotextile and watering, and the maintenance time is not less than 28 days.
The pouring height of the foam is the same as the single-layer building height of the protective wall 1, so that the first-layer road expansion light composite roadbed filling is completed.
The method comprises the steps that a first layer of metal net is laid on the surface of a first layer of light composite roadbed layer, the right side of the metal net completely covers the upper surface layer of a protective wall, the metal net is made of galvanized iron wire nets, the left sides of the galvanized iron wire nets are laid on the surface of a foamed light soil foundation bed, after a certain time is finished when a current pouring layer is poured, the laying of galvanized iron wires and the building of aerated concrete blocks are finished before the pouring of a next layer of foamed light soil foundation bed, and when the galvanized iron wires are laid, U-shaped nails are adopted for anchoring, the longitudinal anchoring interval is 2m, and the transverse anchoring interval is 1 m.
After the galvanized wire mesh is laid, the galvanized wire mesh covering the upper surface of the light-weight protective wall on the right side is fixed by special masonry mortar, a second protective wall layer is continuously built, the second foamed light-weight soil foundation bed is poured after the second protective wall layer 1 is built, the next galvanized wire mesh layer is continuously laid after pouring is finished for a certain time interval, and the next aerated concrete brick layer is built and the foamed light-weight soil foundation bed is poured.
S109, additionally paving an anti-seepage geomembrane on the top surface layer of the light composite roadbed structure;
when the HDPE anti-seepage geomembrane is additionally laid on the top surface layer of the light composite roadbed structure, a hot welding mode is adopted for lap joint, the lap joint width of the connected geomembranes is 5cm, and when the light composite roadbed structure is laid, the light composite roadbed structure is stretched in a flattening manner to avoid the phenomenon of local rolling
To sum up, the embodiment of the invention provides a construction method of a foam light soil composite roadbed for road expansion, compared with the traditional road reconstruction and expansion mode, the foam light soil is used as a main material for the expansion and filling; the light weight property of the composite material can effectively reduce the differential settlement of the new road structure and the old road structure, the self-supporting property and the self-compaction property of the composite material can reduce the land area occupied by the slope of the splicing width part in the two directions and the outside, and meanwhile, the composite material is easy to construct and free from rolling; the light soil composite roadbed structure adopts anchoring and metal net reinforcement to improve the overall stability of the widening structure; the light type extension foundation bed is provided with the protection wall on the outer side, so that the functions of protecting the extension structure, preventing the light type extension foundation bed from being weathered and improving the structural durability are achieved, and the attractiveness of a road can be improved.
The construction method of the foam lightweight soil composite roadbed for road extension provided by the embodiment of the invention is described in detail, a specific example is applied in the construction method to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A construction method of a foam light soil composite roadbed for road extension is characterized by comprising the following steps:
carrying out step excavation on an original roadbed so as to form a plurality of steps on one side of the original roadbed;
pouring protective wall foundation concrete and embedding angle steel upright posts on one side of the original roadbed in the set direction of the steps, and embedding vertical support posts after the pouring of the protective wall foundation concrete is finished;
building aerated concrete on the basis of the protective wall to form the protective wall;
vertically inserting an anchoring part on the step of the original roadbed;
laying an anti-seepage geomembrane at a position between the original roadbed and the protective wall;
dividing a plurality of pouring areas along the trend of the original roadbed, wherein each pouring area is divided into a plurality of pouring layers;
manufacturing foam light soil on site, and performing layered pouring construction in each pouring process in sequence, wherein after the pouring of each layer of foam light soil is finished, a layer of metal mesh is covered on the surface of each layer of foam light soil;
and paving an anti-seepage geomembrane on the top surface of the foamed light soil.
2. The construction method of a foam lightweight soil composite roadbed for road expansion as claimed in claim 1, wherein before the protective wall foundation concrete is cast, a bedding is laid based on a road distance to be expanded;
and the protective wall foundation concrete is poured on the cushion layer.
3. The construction method of a foamed lightweight soil composite roadbed for road extension as claimed in claim 2, wherein the impermeable geomembrane laying at a position between the original roadbed and the protective wall includes:
and (3) performing foam concrete covering and pouring on the surface of the cushion layer, and then paving the anti-seepage geomembrane.
4. The construction method of a foamed lightweight soil composite roadbed for road extension according to claim 3, wherein the impermeable geomembrane laying comprises:
the impermeable geomembrane is wrapped by a preset length upwards along the protective wall;
when the geomembrane is laid at the bottom, the stretching and retracting amount is reserved according to 2-5%.
5. The method of constructing a foamed lightweight soil composite roadbed for road extension as claimed in claim 1, wherein the area of the top surface of a single casting area is not more than 400m2。
6. The method of constructing a foamed lightweight soil composite roadbed for road extension according to claim 1, wherein the step of manufacturing the foamed lightweight soil on site and sequentially performing layered casting construction in each casting comprises:
setting a settlement joint between adjacent pouring areas by using a wooden splint, and filling a polystyrene plate on the section;
the thickness of the single-layer pouring layer is controlled to be 0.3 m-1.0 m, and the single-layer pouring layer in each pouring area is poured at one time.
7. The method of constructing a foamed lightweight soil composite roadbed for road extension according to claim 6, wherein during the pouring of the foamed lightweight soil, the discharge port of the pouring tube is located below the current pouring surface or the distance from the discharge port of the pouring tube to the current pouring surface is not more than 1.5m during the pouring.
8. The method of constructing a foam lightweight soil composite roadbed for road extension according to claim 6, wherein during the foam lightweight soil casting process, if the dead time of the casting process exceeds 30 minutes, the casting pipes need to be cleaned.
9. The construction method of a foam lightweight soil composite roadbed for road extension as claimed in claim 1, wherein the metal net is anchored based on U-shaped nails when being laid;
the longitudinal anchoring distance of the U-shaped nail is 2m, and the transverse anchoring distance is 1 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641536.3A CN112982049A (en) | 2020-12-31 | 2020-12-31 | Foam light soil composite roadbed construction method for road extension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011641536.3A CN112982049A (en) | 2020-12-31 | 2020-12-31 | Foam light soil composite roadbed construction method for road extension |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112982049A true CN112982049A (en) | 2021-06-18 |
Family
ID=76345265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011641536.3A Pending CN112982049A (en) | 2020-12-31 | 2020-12-31 | Foam light soil composite roadbed construction method for road extension |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112982049A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114318982A (en) * | 2021-11-30 | 2022-04-12 | 中南大学 | Foam light soil supporting structure for building large-area terrace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1375482A (en) * | 1971-02-12 | 1974-11-27 | ||
| CN208981122U (en) * | 2018-10-15 | 2019-06-14 | 青海第三路桥建设有限公司 | A kind of bridge platform back Foam lightweight soil roadbed backfill structure |
| CN110042716A (en) * | 2019-04-30 | 2019-07-23 | 杭州悦为科技有限公司 | Foam lightweight soil high-fill roadbed Widening Construction method |
| CN112095380A (en) * | 2020-08-07 | 2020-12-18 | 广东盛瑞科技股份有限公司 | Layered filling method for light combined roadbed at steep slope section |
| CN212223490U (en) * | 2020-03-31 | 2020-12-25 | 广西路桥工程集团有限公司 | High-speed foam light soil roadbed structure in mountain area |
-
2020
- 2020-12-31 CN CN202011641536.3A patent/CN112982049A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1375482A (en) * | 1971-02-12 | 1974-11-27 | ||
| CN208981122U (en) * | 2018-10-15 | 2019-06-14 | 青海第三路桥建设有限公司 | A kind of bridge platform back Foam lightweight soil roadbed backfill structure |
| CN110042716A (en) * | 2019-04-30 | 2019-07-23 | 杭州悦为科技有限公司 | Foam lightweight soil high-fill roadbed Widening Construction method |
| CN212223490U (en) * | 2020-03-31 | 2020-12-25 | 广西路桥工程集团有限公司 | High-speed foam light soil roadbed structure in mountain area |
| CN112095380A (en) * | 2020-08-07 | 2020-12-18 | 广东盛瑞科技股份有限公司 | Layered filling method for light combined roadbed at steep slope section |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114318982A (en) * | 2021-11-30 | 2022-04-12 | 中南大学 | Foam light soil supporting structure for building large-area terrace |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105421485B (en) | Construction method of high-fill prefabricated cast-in-situ combined pile slab wall protection structure | |
| CN110042716B (en) | Widening construction method for high-fill roadbed with foamed light soil | |
| CN104790428B (en) | Ultrahigh integrated plastic-steel grid reinforced soil abutment retaining wall structure and construction method thereof | |
| CN108103871B (en) | Construction method of roadbed foam concrete filling technology adjacent to existing subway facility | |
| CN103526770A (en) | High-impermeable anti-floating pile raft structure and construction method | |
| CN113186766A (en) | Shallow soft soil foundation foam light soil embankment structure and construction method | |
| CN109653049B (en) | Construction method for processing bridge head filling road section on soft foundation | |
| CN112095380A (en) | Layered filling method for light combined roadbed at steep slope section | |
| CN104727302A (en) | Cast-in-place construction process for inter-pile board wall between slide-resistant piles | |
| CN114775352A (en) | Widening structure for embankment wall section of existing roadbed in riverside and construction method | |
| CN109750571A (en) | A kind of road landslide emergency and permanent supporting and retaining system integral structure and construction method | |
| CN112832079A (en) | Construction method of foamed light soil spliced wide-height highway embankment | |
| CN203594041U (en) | Piled raft structure with good resistance to seepage and buoyancy | |
| CN112813757B (en) | Foam light soil composite roadbed construction method for bridge head transition treatment | |
| CN204676593U (en) | A kind of superelevation overall steel-plastic Geogrid Reinforced Soil abutment wall-retaining structure | |
| CN112982049A (en) | Foam light soil composite roadbed construction method for road extension | |
| CN112144337A (en) | Cast-in-place construction process for modified red mud-based foam light soil | |
| CN110805049B (en) | Construction method of mountain slope ultra-thickness spray anchor permanent supporting structure | |
| KR101043285B1 (en) | Settlement of the road surface to prevent the construction of drainage facilities, and he used to drain | |
| US20110110717A1 (en) | Structure for Supporting Vehicular Traffic | |
| RU97388U1 (en) | CAR CONCRETE ROAD | |
| CN111827030A (en) | High-fill embankment structure and construction method | |
| CN111663492A (en) | River channel ecological management construction process | |
| CN111254938B (en) | Foundation pit supporting structure based on side wall of underground chamber and reverse construction method thereof | |
| CN219410378U (en) | Rock slope overhanging type road structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210618 |