CN103628378A - Waterside road broadened embankment structure and construction method thereof - Google Patents
Waterside road broadened embankment structure and construction method thereof Download PDFInfo
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Abstract
The invention relates to a waterside road broadened embankment structure, which is characterized in that the waterside side of a new embankment is provided with a waterproof maintenance pile, and the outer side of the maintenance pile is provided with a dumping stone weights body; the lower part of the new embankment is a solidified soil layer, the upper part of the new embankment is a lightweight filler layer, and the contact part of the solidified soil layer and the lightweight filler layer is provided with a horizontal reinforced body and a vertical reinforced body; a grouting strengthened body is arranged in an original embankment, and the front end of the grouting strengthened body is a reinforced connecting section; and the side slopes on the top surface and outer side of the new embankment and the two sides of the maintenance pile are respectively provided with a waterproof later, and the bottom of the dumping stone weights body is provided with an impervious blanket. According to the invention, the connection strength and integrity of the new and original embankments can be enhanced, an outside water body is prevented from permeating in the embankments from multiple beddings, and the anti-uplift performance of the embankment can be improved, therefore, the embankment structure has good technical and economic benefits. The invention also provides a construction method of the broadened embankment structure.
Description
Technical field
The present invention relates to a kind of highway embankment and widen structure, particularly a kind of Widening Embankment structure of highway near water and construction method, can strengthen new former embankment intensity and globality, prevent that extraneous water body from infiltrating, improving embankment stability.Belong to highway engineering field, be applicable to old road reconstruction and extension project, be specially adapted near water the one-sided or bilateral embankment widening project of highway.
Background technology
In recent years, along with developing rapidly of China's economy, traffic volume of highway cumulative year after year, the traffic volume of some highways has approached saturation flow, and to this, for meeting growing transport need and social development needs, highway reconstruction and expansion project is more and more.Though these projects have higher Technological Economy value to improving category of roads and improving road network structure, due to the settlement difference of embankment He Xin road, old road embankment, cause new former embankment junction to be prone to the qualitative problems of construction such as pavement cracking, local subsidence.In addition, for original path, for along the river, for riverine road, can run into unavoidably one-sided or bilateral problem near water, its mechanical characteristic is more complicated, also there will be the engineering problems such as seepage failure, embankment floating if deal with improperly.
For strengthen new-old pavement combination, effectively control the differential settlement amount of new and old roadbed, at present existing more processing method, common are and adopt new former embankment junction step excavation, lays Application of geosynthetics-reinforced layer, adopts the engineering measures such as light filler railway embankment using.Wherein, step excavation within the scope of the embankment fill material of step excavation Shi Jiu road, new former embankment junction, this method construction is simple, can strengthen to a certain extent the bonding strength of new former embankment junction; It is to lay the materials such as geo-grid, reinforced mesh within the scope of new embankment fill material that Application of geosynthetics-reinforced bed course, reinforced soil embankment are set, with globality and the intensity of reinforcer; It is to adopt light filler as embankment fill material that light road bank fills, and this method can alleviate the weight of new railway embankment using to a great extent, reduces newly to fill out the subsidiary stress of embankment to former embankment basis.
Although said method can play very good renovating effect in the lower section of groundwater table, but in section near water, but be difficult to resolve certainly the seepage failure problem of embankment fill material and the infiltration problem of extraneous water body, cause embankment soil erosion, along with the bottom soil body is loose, vacancy, even if there is reinforcement material, still keep embankment integrality, even if similar lightweight cellular concrete etc. has the filler that integral body is filled effect, also can ftracture, and because of the certain floating of the higher generation of water level near water.
In sum, day by day ripe for the measure that solves old road widened section relative settlement problem in engineering, and form the combined construction method of various measures, and play and avoid new former embankment binding site to occur the problem of relative settlement and cracking at suitable engineering specifications.Yet existing measure rarely has and relates to old road embankment supporting capacity and improve, control the design that causes old roadbed sedimentation again (distortion) because of inclined load increase; Even if highway enlarging time has the related measure of the conservation of soil and water near water, but the On The Floating likely occurring for embankment and whole antiseepage ask that body often do not considered by emphasis, have certain hidden dangers in project.
Given this, differential settlement for the old and new's embankment after minimizing road widening, successfully manage section soil erosion near water and On The Floating, improve the globality widen highway subgrade, urgently invent a kind of intensity and globality that strengthens new former embankment at present, prevent that extraneous water body from infiltrating, improving the Widening Embankment structure of highway near water and the construction method of embankment stability.
Summary of the invention
The object of the present invention is to provide a kind of intensity and globality that can simultaneously strengthen new former embankment, and can effectively stop outside water body to infiltrate, improve the novel Widening Embankment structure of highway near water and the construction method of embankment stability and non-deformability.
In order to realize above-mentioned technical purpose, the present invention has adopted following technical scheme:
A highway Widening Embankment structure, is characterized in that being provided with water proof maintaining pile in the side near water of new embankment near water, and the outside of maintaining pile is provided with jackstone ballast body; The bottom of new embankment is for solidifying soil layer, and top is light filler layer, at curing soil layer and light filler layer contact position, is provided with transversal reinforcement body and vertical reinforced body; In former embankment, be provided with grouting and reinforcing body, grouting and reinforcing body front end is reinforcement linkage section; End face, outside side slope and maintaining pile both sides at new embankment arrange water barrier, in jackstone ballast body bottom, are provided with impervious blanket.
Described maintaining pile is near water the precast rc slab stake with ribbing with water isolating.
After the interior silt of curing soil layer effluent bed, rubble and former side slope of embankment regulation spoir mix cement and curing compound, compacting is filled and is formed, and solidifies in soil layer and is implanted with in advance vertical reinforced body, and end face is laid transversal reinforcement body.
Described vertical reinforced body can adopt indented bars or hard high strength reinforcement mesh sheet, and transversal reinforcement body can adopt geo-grid, high strength reinforcement mesh sheet or geotextile, between transversal reinforcement body and vertical reinforced body, adopts colligation to be connected or is welded to connect.
Light filler layer can be adopted as air bubble mix light-textured soil, foam beads mix light-textured soil or EPS particle light soil, is equipped with transversal reinforcement body in light filler layer.
Described grouting and reinforcing body, for tiltedly to draw hole from former side slope of embankment, forms in the slip casting of former embankment inner high voltage, and its bottom is provided with pressure and expands termination.
Described reinforcement linkage section is grouting and reinforcing body leading portion implanted reinforced bar cage and adopts pea gravel concreten to recharge to form.
Described impervious blanket adopts good pea gravel concreten, anti-seepage geomembrane or the splash guard of anti-permeability performance, and impervious blanket is closely connected with the water barrier in maintaining pile outside.
A construction method for highway Widening Embankment structure near water, is characterized in that comprising the following steps:
1) before construction, prepare: clear up former side slope of embankment, organizing construction's equipment is marched into the arena, and cofferdam is set and carries out artificial rainmaking;
2) set water proof maintaining pile: in embankment outside, set water proof maintaining pile, water proof maintaining pile should be inserted to steady soil;
3) lay water barrier: inner side and outer surface at water proof maintaining pile are laid water barrier;
4) Seepage: impervious blanket is laid in the outside at water proof maintaining pile, and impervious blanket is closely connected with the water barrier in maintaining pile outside;
5) grouting and reinforcing body construction: from former roadbed side slope along the oblique hole of drawing to even interval in length and breadth, to drawing bottom, hole, carry out reaming processing, duct inner high voltage slip casting, at duct leading portion, implant reinforcing body reinforcing bar, recharge again pea gravel concreten, after fixed, former side slope of embankment is trimmed to step-like, exposed portions serve reinforcement section;
6) curing soil layer is set: bottom, the former river course of part pasture and water, mud are widened in cleaning, suitably digs after dark and solidify on the spot the riverbed soil body, and the spoir producing in work progress early stage is solidified and is backfilled to former embankment bed course end face absolute altitude, vertical reinforced body is set in solidified earth;
7) jackstone ballast body construction:, the top of impervious blanket arranges jackstone, form jackstone ballast body in the outside of maintaining pile, should prevent during construction that jackstone ballast body from damaging impervious blanket;
8) light filler is filled: until curing soil layer, reach after design strength, the light filler that paves of layering thereon, when each light filler is filled to former side slope of embankment step surface absolute altitude, lays transversal reinforcement body thereon;
9) side slope is repaired: after light filler has been filled, side slope outside new embankment is trimmed to design grade;
10) water barrier is laid: end face, outside side slope outside at new embankment are laid water barrier, and the two ends of outside side slope lateral septal water layer are connected closely with new embankment end face water barrier, maintaining pile medial septal water layer respectively;
11) follow-up construction: widen the follow-up constructions such as part road structure, gutter, side slope protection face and afforestation vegetation according to designing requirement construction.
the present invention has following feature and beneficial effect:
(1) at new former embankment joining place, grouting and reinforcing body is set and both can strengthens the bonding strength of new former embankment, prevent new former embankment joining place generation differential deformation, also can improve the stress performance of new former embankment, improve the supporting capacity of embankment.
(2) new embankment bottom adopts solidified earth to fill globality and the intensity that not only can improve embankment fill material, and can reduce and abandon earth volume, realizes twice laid, and forms abundant underlayer, and self-stable ability is stronger; New embankment top adopts light filler to fill, and takes full advantage of that light filler is lightweight, intensity is high, the advantage of good endurance, and can effectively reduce the subsidiary stress value of foundation soil, reduces the deformation of sedimentation of roadbed.
(3) outside embankment, the setting of maintaining pile can be played water proof simultaneously, strengthens stability, reduce river course and invade space consuming effect; The effect that the jackstone ballast body of its arranged outside can play and prevent seepage failure, strengthen stability.
(4) water barrier of embankment end face, side slope outside, the setting of maintaining pile both sides, and the setting of impervious blanket can cut off from many levels, extend the path that extraneous water body infiltrates embankment, guarantees that the moisture content of embankment meets design requirement, and prevents seepage failure.
In a word; feature of the present invention is both can improve globality and the intensity of the old and new's roadbed; can improve again near joint portion and the physical and mechanical property of new embankment; also can effectively prevent embankment generation seepage failure, thereby realized multi-angle, prevent the object of highway Widening Embankment disease, saving construction costs, protection of the environment near water.
Accompanying drawing explanation
Fig. 1 is a kind of highway near water of the present invention Widening Embankment structure section schematic diagram;
In figure: the former road structure of 1-, the former embankment of 2-, 3-reinforcement linkage section, 4-widen part road structure, 5-light filler layer, 6-transversal reinforcement body, 7-gutter, 8-leveling layer, 9-water barrier, 10-bank protection face, 11-vertical reinforced body, the curing soil layer of 12-, 13-water proof maintaining pile, 14-jackstone ballast body, 15-river course, 16-riverbed, 17-roadbed bed course, 18-grouting and reinforcing body, 19-impervious blanket, the former embankment soil matrix of 20-.
Specific embodiment
The side slope of embankment bench excavation construction of present embodiment Zhong Jiu road, maintaining pile construction technical requirement, the design and construction technical requirements of grouting serous fluid, light filler, pea gravel concreten, the laying construction technical requirements of reinforcing body reinforcing bar binding, transversal reinforcement body, in the present embodiment such as design and construction technical requirements of roadbed side slope protection, road structure, be not repeated, emphasis is set forth the embodiment that the present invention relates to structure.
Fig. 1 is a kind of highway near water of the present invention Widening Embankment structure section schematic diagram.Shown in Fig. 1, a kind of Widening Embankment of highway near water structure is mainly comprised of light filler layer 5, transversal reinforcement body 6, water barrier 9, vertical reinforced body 11, curing soil layer 12, water proof maintaining pile 13, jackstone ballast body 14, grouting and reinforcing body 18, impervious blanket 19.
The total length of grouting and reinforcing body 18 is 5000mm, adopt small-sized drill from former embankment 2 side slopes along 45 ° of inclination angles to embankment inner hole, pass roadbed bed course 17 to former embankment soil matrix 20, channel diameter 150mm, the diameter that bottom expands termination is 400mm, and horizontal, the vertical interval in duct is respectively 3000mm and 1500mm; The bottom of grouting and reinforcing body 18 is provided with and expands termination, the reinforcement linkage section 3 of 2000mm is established on top, reinforcing body is reinforcing cage, it is the indented bars that 12mm, strength grade are Q345 that main muscle adopts diameter, reinforcement linkage section 3 adopts pea gravel concreten backfills, until grouting and reinforcing body 18 and reinforcement linkage section 3 reach design strength more than 80% after, former embankment 2 side slope fillers are trimmed to step-like, vertical height and the transverse width of step are 1000mm, establish 3% leaning angle on step surface.In conjunction with artificial soil digging, interior reinforcement linkage section 3 parts of former embankment 2 are exposed to the soil body.
Vertical reinforced body 11 adopts long 2000mm diameter 16mmHRB345 indented bars, wherein stretches into and solidifies soil layer 12 segment length 800mm, uniformly-spaced arranges in length and breadth with 500mm.
Table 1 transversal reinforcement body 6 design parameter tables
| Mass area ratio deviation | Thickness | Amplitude error | Ultimate strength | Elongation at break | Tearing |
| 7% | ≥2.4mm | -0.5% | ≥9.5? KN/m | 25～100% | ≥0.24 KN |
Water barrier 9 adopts composite geo-membrane.The lap length of water barrier 9 is not less than 200mm.The design parameter of water barrier 9 is referring to table 2.
Table 2 water barrier 9 parameter lists
| Sequence number | Project | Design objective |
| 1 | Weight per unit area g/m 2 | >=600(thickness >=2.7mm) |
| 2 | Thickness (with normal pressure relation) mm | ≥2.7 |
| 3 | Resistance to hydrostatic pressure power Mpa | ≥0.6 |
| 4 | Vertical transmission coefficient cm/s | ＜1×10 -11 |
Water proof maintaining pile 13 adopts the good precast rc slab stake with ribbing of water isolating, and design maintenance stake 13 end face absolute altitudes exceed ordinary water level 1200mm, and adjacent sheet pile joining place is established watertight rubber bar.
Highway Widening Embankment structure near water, main construction course is as follows:
1) before construction, prepare: clear up former embankment 2 side slopes, organizing construction's equipment is marched into the arena, and cofferdam is set and carries out artificial rainmaking;
2) set water proof maintaining pile: according to embankment, widen situation, set water proof maintaining pile 13 in embankment outside, water proof maintaining pile 13 should be inserted to and in steady soil, be not less than 1000mm;
3) lay water barrier: inner side and outer surface at maintaining pile are laid water barrier 9;
4) Seepage: impervious blanket 19 is laid in the outside at water proof maintaining pile 13, and impervious blanket 19 is closely connected with the water barrier 9 in maintaining pile 13 outsides;
5) grouting and reinforcing body construction: from former embankment 2 side slopes along the oblique hole of drawing to even interval in length and breadth, to drawing bottom, hole, carry out reaming processing, duct inner high voltage slip casting, at duct leading portion implanted reinforced bar cage, recharge again pea gravel concreten, after fixed, former side slope of embankment is trimmed to step-like, exposed portions serve reinforcement linkage section 3;
6) solidify soil layer construction: bottom, the former river course of part pasture and water, mud are widened in cleaning, suitably dig after dark and solidify on the spot riverbed 16 soil bodys, and the spoir producing in work progress early stage is solidified and is backfilled to former embankment bed course 17 end face absolute altitudes, form and solidify soil layer 12;
7) jackstone ballast body construction: in the outside of water proof maintaining pile 13, the top jackstone of impervious blanket 19, form jackstone ballast body 14, should prevent during construction that jackstone ballast body 14 from damaging impervious blankets 19;
8) light filler layer 5 fills: until curing soil layer 12, reach after design strength, the light filler that paves of layering thereon, when each light filler is filled to former side slope of embankment step surface absolute altitude, should lay transversal reinforcement body 6 thereon, light filler should be connected with reinforcement linkage section 3;
9) side slope is repaired: after light filler layer 5 has filled, side slope outside new embankment is trimmed to design grade;
10) water barrier is laid: in new embankment end face, outside side slope outside, lay water barrier 9, and the two ends of side slope side water barrier are connected closely with new embankment end face water barrier, water proof maintaining pile 13 medial septal water layers respectively;
11) follow-up construction: widen the follow-up constructions such as part road structure 4, gutter 7, side slope protection face 10 and afforestation vegetation according to designing requirement construction.
Claims (9)
1. a highway Widening Embankment structure near water, is characterized in that being provided with water proof maintaining pile in the side near water of new embankment, and the outside of maintaining pile is provided with jackstone ballast body; The bottom of new embankment is for solidifying soil layer, and top is light filler layer, at curing soil layer and light filler layer contact position, is provided with transversal reinforcement body and vertical reinforced body; In former embankment, be provided with grouting and reinforcing body, grouting and reinforcing body front end is reinforcement linkage section; End face, outside side slope and maintaining pile both sides at new embankment arrange water barrier, in jackstone ballast body bottom, are provided with impervious blanket.
2. the Widening Embankment of highway near water structure according to claim 1, described in it is characterized in that, maintaining pile is the precast rc slab stake with ribbing with water isolating near water.
3. the Widening Embankment of highway near water structure according to claim 1, it is characterized in that after silt in described curing soil layer effluent bed, rubble and former side slope of embankment regulation spoir mix cement and curing compound that compacting is filled forms, solidify in soil layer and be implanted with in advance vertical reinforced body, end face is laid transversal reinforcement body.
4. the Widening Embankment of highway near water structure according to claim 1, it is characterized in that described vertical reinforced body can adopt indented bars or hard high strength reinforcement mesh sheet, transversal reinforcement body can adopt geo-grid, high strength reinforcement mesh sheet or geotextile, between transversal reinforcement body and vertical reinforced body, adopts colligation to be connected or is welded to connect.
5. the Widening Embankment of highway near water structure according to claim 1, is characterized in that described light filler layer can be adopted as air bubble mix light-textured soil, foam beads mix light-textured soil or EPS particle light soil, is equipped with transversal reinforcement body in light filler layer.
6. the Widening Embankment of highway near water structure according to claim 1, is characterized in that described grouting and reinforcing body, for tiltedly to draw hole from former side slope of embankment, forms in the slip casting of former embankment inner high voltage, and its bottom is provided with pressure and expands termination.
7. the Widening Embankment of highway near water structure according to claim 1, is characterized in that described reinforcement linkage section is grouting and reinforcing body leading portion implanted reinforced bar cage and adopts pea gravel concreten to recharge to form.
8. the Widening Embankment of highway near water structure according to claim 1, is characterized in that described impervious blanket adopts good pea gravel concreten, anti-seepage geomembrane or the splash guard of anti-permeability performance, and impervious blanket is closely connected with the water barrier in maintaining pile outside.
9. the construction method of the Widening Embankment of the highway near water structure described in claim 1 ~ 8, is characterized in that comprising the following steps:
1) before construction, prepare: clear up former side slope of embankment, organizing construction's equipment is marched into the arena, and cofferdam is set and carries out artificial rainmaking;
2) set water proof maintaining pile: in embankment outside, set water proof maintaining pile, water proof maintaining pile should be inserted to steady soil;
3) lay water barrier: inner side and outer surface at water proof maintaining pile are laid water barrier;
4) Seepage: impervious blanket is laid in the outside at water proof maintaining pile, and impervious blanket is closely connected with the water barrier in maintaining pile outside;
5) grouting and reinforcing body construction: from former roadbed side slope along in length and breadth to even interval to the oblique hole of drawing, to drawing bottom, hole, carry out reaming processing, duct inner high voltage slip casting, at duct leading portion, implant reinforcing body reinforcing bar, recharge again pea gravel concreten, after fixed, former side slope of embankment is trimmed to step-like, exposed portions serve reinforcement section;
6) curing soil layer is set: bottom, the former river course of part pasture and water, mud are widened in cleaning, suitably digs after dark and solidify on the spot the riverbed soil body, and the spoir producing in work progress early stage is solidified and is backfilled to former embankment bed course end face absolute altitude, vertical reinforced body is set in solidified earth;
7) jackstone ballast body construction:, the top of impervious blanket arranges jackstone, form jackstone ballast body in the outside of maintaining pile, should prevent during construction that jackstone ballast body from damaging impervious blanket;
8) light filler is filled: until curing soil layer, reach after design strength, the light filler that paves of layering thereon, when each light filler is filled to former side slope of embankment step surface absolute altitude, lays transversal reinforcement body thereon;
9) side slope is repaired: after light filler has been filled, side slope outside new embankment is trimmed to design grade;
10) water barrier is laid: end face, outside side slope outside at new embankment are laid water barrier, and the two ends of outside side slope lateral septal water layer are connected closely with new embankment end face water barrier, maintaining pile medial septal water layer respectively;
11) follow-up construction: widen the follow-up constructions such as part road structure, gutter, side slope protection face and afforestation vegetation according to designing requirement construction.
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