CN209873478U - Soft soil roadbed structure for preventing uneven settlement - Google Patents
Soft soil roadbed structure for preventing uneven settlement Download PDFInfo
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- CN209873478U CN209873478U CN201822120238.4U CN201822120238U CN209873478U CN 209873478 U CN209873478 U CN 209873478U CN 201822120238 U CN201822120238 U CN 201822120238U CN 209873478 U CN209873478 U CN 209873478U
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Abstract
The utility model provides a prevention uneven settlement's soft soil roadbed structure, includes cement mixing stake array, bed course, trades and fills foam concrete layer and reinforced concrete slab that set gradually from roadbed bottom to top layer, and cement mixing stake array is including shooting many cement mixing stakes in the soft soil foundation, lays the high-strength steel wire grid that two-layer two-way tensile strength is not less than 100KN/m in the bed course, the bottom of trading and filling foam concrete layer is less than the current situation ground wire of roadbed construction, the top of trading and filling foam concrete layer is higher than the current situation ground wire of roadbed construction, reinforced concrete slab and trade and fill foam concrete layer and rely on the concrete fixed combination to reinforced concrete slab upper surface height reduces gradually to the roadbed outside by the roadbed inboard. The utility model provides high road bed atress deformation state wholeness, the problem of uneven settlement takes place for control weak soil road bed, and the effectual cement mixing stake that has solved is long not enough and the problem that foam concrete compressive strength is low, avoids the appearance of diseases such as the vertical horizontal fracture of road.
Description
Technical Field
The utility model belongs to the technical field of the road bed construction, concretely relates to prevention uneven settlement's weak soil roadbed structure.
Background
The existing soft soil roadbed has more outstanding uneven settlement problems, and some road sections have higher water content, so the strength is very low, the permeability is poor, the compressibility is good, and the soft soil roadbed is a very soft foundation. Particularly, the roadbed is filled with soil and stones in the sea area plain region in a mixed mode, and the longitudinal and transverse cracking of the road surface is reflected; if the common form concrete is used for the treatment work of the foundation, the actual requirements of settlement are basically not met, and the construction quality is low. But the phenomena of longitudinal and transverse cracking of the road surface are less in the integral roadbeds such as the later grouting of the lime-soil roadbed and the soil-stone mixed roadbed and the like; the core problem of uneven settlement of the soft soil roadbed is the overall control problem of the stress deformation state of the roadbed. The problem of overall control of the stress deformation state of the roadbed of the newly-built highway in the place with more land and less land along the sea mountain and rich slag can be solved, the problem that longitudinal and transverse cracking diseases of the pavement repeatedly occur can be avoided, and the construction fund and the maintenance fund can be saved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a prevention uneven settlement's weak soil roadbed structure through cement stirring stake, trades the combination of filling out foam concrete and reinforced concrete board and uses, can effectual improvement road bed atress deformation state wholeness, and the problem of uneven settlement takes place for the control weak soil roadbed, and the effectual cement stirring stake length of having solved is not enough and the problem that foam concrete compressive strength is low, avoids the appearance of diseases such as the vertical horizontal fracture of road.
In order to realize the purpose, the utility model discloses a technical scheme is:
the utility model provides a soft soil roadbed structure, includes cement mixing stake array, bed course, trade that set gradually from roadbed bottom to roadbed top layer and fills out the foam concrete layer and be used for homodisperse to trade the reinforced concrete board that fills out the road surface load that the foam concrete layer received, cement mixing stake array is including shooting many cement mixing stakes in the soft soil foundation, lay the high-strength steel wire grid that two-layer two-way tensile strength is not less than 100KN/m in the bed course, the bottom of filling out the foam concrete layer is less than the current situation ground wire of roadbed construction, the top of filling out the foam concrete layer is higher than the current situation ground wire of roadbed construction, the reinforced concrete board relies on the concrete fixed combination with changing to the foam concrete board upper surface height reduces to roadbed both sides by road bed central line gradually.
The cement mixing pile is 0.5m in diameter and 15 m in length, and any three adjacent cement mixing piles are distributed in a regular triangle shape.
The cushion layer is a slag clearing cushion layer or a broken stone cushion layer, and the thickness of the cushion layer is 0.5 m.
And the backfill pre-pressing soil layers are arranged on two sides and below the replacement and filling foam concrete layer, and composite geotextile is laid between the backfill pre-pressing soil layer and the cushion layer below the replacement and filling foam concrete layer.
And steel wire meshes are respectively placed in the position 0.5m away from the bottom and the top of the foam concrete layer, and the length of the longitudinal and transverse lap joint of the adjacent steel wire meshes is 20 cm.
The utility model has the advantages that:
first, the utility model discloses a structure is with cement mixing stake array, trade and is filled out the combination use of foam concrete and reinforced concrete board, can effectual improvement road bed atress deformation state wholeness, and the problem of uneven settlement takes place for the control weak soil road bed, and the effectual cement mixing stake length of having solved is not enough with the problem that foam concrete compressive strength is low, avoids the appearance of diseases such as the vertical horizontal fracture of road.
Second, the utility model discloses in adjacent three cement mixing stake be regular triangle distribution, cement mixing stake array top is provided with the bed course, and the steel wire grid that excels in that two-layer two-way tensile strength is not less than 100KN/m has been laid in the bed course, just so make cement mixing stake cell layer form a composite foundation, become a reinforcement, be favorable to overcoming the inhomogeneous settlement of foundation, and the setting of bed course can disperse the ascending effort of cement mixing stake pile body again, avoid cement mixing stake pile body direct action to trade and fill foam concrete layer, thereby the protection trades and fills foam concrete layer, avoid its inhomogeneous atress and fracture.
Third, the utility model discloses in trade and fill out the foam concrete layer in the position of 0.5 meters apart from the top and be equipped with the wire net, the top layer is reinforced concrete board in addition and bears down the roof, both combine, to a great extent has improved foam concrete crack control function, alleviateed the road surface top simultaneously and moved the load influence, make things convenient for the road surface structural layer construction, and can also disperse the load on road surface, make the cement mixing pile array atress of whole roadbed structure especially bottom more even, avoid individual cement mixing pile to appear subsiding because of the atress inequality, finally lead to whole road bed to appear the phenomenon of inhomogeneous settlement.
Fourth, the utility model discloses a trade and fill foam concrete layer partly below being located the current situation ground wire, partly be located more than the current situation ground wire, just so can firmly inlay on whole basic bottom surface, the improvement of very big degree the overall stability of structure, be difficult to take place the displacement and warp.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a schematic plan view of an array of cement mixing piles;
the labels in the figure are: 1. the concrete mixing pile comprises a cement mixing pile array, 2, a cushion layer, 3, a replacement and filling foam concrete layer, 4, a reinforced concrete plate, 5, a current situation ground line, 6, a secondary excavation line, 7, a high-strength steel wire grid, 8, a steel wire mesh sheet, 9, composite geotextile, 10 and a cement mixing pile.
Detailed Description
The technical solution of the present invention will be further explained by the following specific embodiments with reference to the accompanying drawings.
As shown in the figure, the soft soil roadbed structure comprises a cement mixing pile array 1, a cushion layer 2, a foam concrete replacement and filling layer 3 and a reinforced concrete slab 4 for uniformly dispersing the road surface load borne by the foam concrete replacement and filling layer 3 which are sequentially arranged from the roadbed bottom layer to the roadbed surface layer, the cement mixing pile array 1 includes a plurality of cement mixing piles 10 driven in a soft soil foundation, two layers of high-strength steel wire grids 7 with the bidirectional tensile strength not less than 100KN/m are paved in the cushion layer 2, the bottom of the foam concrete replacing and filling layer 3 is lower than the current ground line 5 of the roadbed construction, the top of the foam concrete replacing and filling layer 3 is higher than the current ground line 5 of the roadbed construction, the reinforced concrete slab 4 and the replacement and filling foam concrete layer 3 are fixedly combined by concrete, and the height of the upper surface of the reinforced concrete slab 4 is gradually reduced from the center line of the roadbed to the two sides of the roadbed.
The present invention will be further explained by taking the specific construction process of a certain sea-filling area as an example.
(1) During construction, firstly digging out 2m thick throwing filler, finishing and leveling the foundation, then driving the cement mixing pile array 1, and constructing the cement mixing pile 10 according to a two-spraying four-stirring construction process; according to the requirements of design and construction site, cement mixing piles 10 with the diameter of 0.5m are arranged, the distance between every two adjacent cement mixing piles is 130cm, the length of each pile is 15 meters, and the three adjacent cement mixing piles 10 are arranged in a regular triangle, as shown in figure 2;
(2) after the cement mixing pile array 1 is constructed, laying a slag cleaning cushion layer 2 with the thickness of 0.5m on the top of a cement mixing pile 10, laying two layers of high-strength steel wire grids 7 with the two-way tensile strength not less than 100KN/m in the cushion layer 2, and compacting and leveling the high-strength steel wire grids;
(3) after laying the composite geotextile 9 on the top of the cushion layer 2, carrying out backfill prepressing, wherein the backfill prepressing soil can adopt the slag rich in the area, firstly, the weight of the backfill prepressing soil is equal to that of the foam concrete at the later stage and is uniformly laid on the surface of the roadbed, and the surface is mechanically rolled, and the equivalent prepressing is carried out for not less than 1 month; then, after the equivalent prepressing, carrying out overload prepressing, wherein the overload prepressing still adopts slag, the overload height is 50cm, and the overload prepressing time is not less than 6 months;
(4) performing secondary excavation on the backfilled pre-compacted soil, wherein a secondary excavation line 6 is shown in fig. 1, the bottom of the secondary excavation is positioned below a current ground line 5, the inner gradient ratio of the secondary excavation is 1:1, and the outer gradient ratio of the secondary excavation above the current ground line 5 is 1: 1.5;
(5) preparing foam concrete: the cement adopts Ninghai powerful flood conch P.042.5, the specification model of the foaming agent is Taizhou Jingtong JT-IH, the water cement ratio is 0.6, the foam is produced by mixing compressed air and a foaming agent aqueous solution, the foaming ratio is adjustable and stable, and a hydraulic pressure stabilizing mode is adopted when the mixture is mixed and foamed;
(6) pouring foam concrete: pumping the foam concrete to a construction area by using a pipeline pump, pouring by self-flowing of the foam concrete, wherein during pouring, a pouring pipe keeps a gentle inclination angle with a pouring surface, the depth of a pipe orifice embedded in the foam concrete is not less than 10cm so as to reduce the defoaming amount of the foam concrete, and a pouring point is expanded from the center to four sides or is poured by adopting multiple points; and placing reinforcing mesh sheets 8 at positions which are 50cm above the bottom surface and below the top surface after pouring, wherein the specification of the reinforcing mesh sheets 8 is 10cm by 10cm meshes, the diameter of the reinforcing steel bars is 6cm, the transverse and longitudinal lap joint length of the mesh sheets is 20cm, and the mesh sheets are connected by galvanized steel wires as shown in figure 1.
(8) After pouring of each layer of the replacement and filling foam concrete layer 3 is finished, covering, moisturizing and maintaining the top surface of the filling body; when the top surface of the foam concrete layer 3 is filled in the range of the roadbed, the pavement construction must be carried out after the top layer foam concrete is maintained for 28 days;
(9) after the foam concrete is poured and maintained, a top layer erecting template filled with a foam concrete layer 3 is replaced, a reinforcing mesh is laid, a protective layer with the height of 7cm is reserved below the reinforcing mesh, the diameter of a reinforcing steel bar is 12mm, the mesh size is 100mm multiplied by 100mm, then concrete is poured, a reinforced concrete slab 5 with the thickness of 15cm is obtained, the pavement structure is constructed on the reinforced concrete slab 5 and the height of the upper surface of the reinforced concrete slab 5 is gradually reduced from the center line of the roadbed to the two sides of the roadbed.
In the pouring of the foam concrete, the following points need to be noted:
1. mechanical equipment is reasonably configured according to the field condition, a relay pump can be adopted for long-distance conveying, or a grading conveying mode is adopted for high-lift conveying;
2. if the standing time exceeds 30 minutes in the pouring process, the pipeline is cleaned in time, and the pipeline is cleaned on the basis of clean water outlet of the pipeline;
3. when the top layer is poured, dragging the pouring pipe in a retreating mode to perform manual sweeping, and after the final set of the pouring layer, performing upper-layer pouring construction;
4. in the pouring process, disturbance to the foam concrete is reduced, and the pouring pipe is not required to move or move randomly in the foam concrete;
5. detecting the wet volume weight and the fluidity of the foam concrete according to a specified detection method and detection frequency in the pouring process, and if the wet volume weight and the fluidity of the foam concrete do not meet the requirements, adjusting the wet volume weight and the fluidity of the foam concrete in time;
6. the construction time of the pouring layer in a single pouring area is preferably controlled within the initial setting time of cement paste;
7. each layer is poured to a thickness of about 50cm (30-80 cm is required).
Claims (5)
1. The utility model provides a soft soil roadbed structure of prevention differential settlement which characterized in that: comprises a cement mixing pile array (1), a cushion layer (2), a replacement and filling foam concrete layer (3) and a reinforced concrete plate (4) which is used for uniformly dispersing road surface load borne by the replacement and filling foam concrete layer (3) which are sequentially arranged from a roadbed bottom layer to a roadbed surface layer, the cement mixing pile array (1) comprises a plurality of cement mixing piles (10) which are shot into a soft soil foundation, two layers of high-strength steel wire grids (7) with the bidirectional tensile strength not less than 100KN/m are paved in the cushion layer (2), the bottom of the foam concrete replacement layer (3) is lower than the current ground line (5) of roadbed construction, the top of the foam concrete replacing and filling layer (3) is higher than the current ground line (5) of the roadbed construction, the reinforced concrete slab (4) and the replacement and filling foam concrete layer (3) are fixedly combined by concrete, and the height of the upper surface of the reinforced concrete slab (4) is gradually reduced from the inner side of the roadbed to the outer side of the roadbed.
2. A soft soil subgrade structure against differential settlement according to claim 1, in which: the diameter of each cement mixing pile (10) is 0.5 meter, the length of each cement mixing pile is 15 meters, and any three adjacent cement mixing piles (10) are distributed in a regular triangle shape.
3. A soft soil subgrade structure against differential settlement according to claim 1, in which: the cushion layer (2) is a slag removing cushion layer or a broken stone cushion layer, and the thickness of the cushion layer is 0.5 m.
4. A soft soil subgrade structure against differential settlement according to claim 1, in which: and the backfill pre-pressing soil layers are arranged on two sides and below the replacement and filling foam concrete layer (3), and a composite geotextile (9) is laid between the backfill pre-pressing soil layer and the cushion layer below the replacement and filling foam concrete layer (3).
5. A soft soil subgrade structure against differential settlement according to claim 1, in which: and steel wire meshes (8) are respectively placed in the positions 0.5m away from the bottom and the top of the foam concrete layer (3) in the replacement and filling process, and the length of the vertical and horizontal lap joints of the adjacent steel wire meshes (8) is 20 cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822120238.4U CN209873478U (en) | 2018-12-18 | 2018-12-18 | Soft soil roadbed structure for preventing uneven settlement |
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| CN201822120238.4U CN209873478U (en) | 2018-12-18 | 2018-12-18 | Soft soil roadbed structure for preventing uneven settlement |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304986A (en) * | 2020-02-27 | 2020-06-19 | 中交二公局第四工程有限公司 | Construction method for treating soft foundation settlement in plateau frozen soil area |
| CN112900175A (en) * | 2021-01-19 | 2021-06-04 | 华振贵 | Road widening structure and construction method thereof |
| CN114990955A (en) * | 2022-05-31 | 2022-09-02 | 广东平润建设工程有限公司 | Municipal road structure in urban soft soil foundation zone and construction method thereof |
| CN115450084A (en) * | 2022-09-27 | 2022-12-09 | 中冶南方城市建设工程技术有限公司 | Soft soil foundation long-service-life pavement structure and design method thereof |
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2018
- 2018-12-18 CN CN201822120238.4U patent/CN209873478U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304986A (en) * | 2020-02-27 | 2020-06-19 | 中交二公局第四工程有限公司 | Construction method for treating soft foundation settlement in plateau frozen soil area |
| CN112900175A (en) * | 2021-01-19 | 2021-06-04 | 华振贵 | Road widening structure and construction method thereof |
| CN114990955A (en) * | 2022-05-31 | 2022-09-02 | 广东平润建设工程有限公司 | Municipal road structure in urban soft soil foundation zone and construction method thereof |
| CN115450084A (en) * | 2022-09-27 | 2022-12-09 | 中冶南方城市建设工程技术有限公司 | Soft soil foundation long-service-life pavement structure and design method thereof |
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