CN109811607B - Light high embankment structure in mountain steep slope road section beneficial to disaster prevention and construction method - Google Patents
Light high embankment structure in mountain steep slope road section beneficial to disaster prevention and construction method Download PDFInfo
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- CN109811607B CN109811607B CN201910141597.4A CN201910141597A CN109811607B CN 109811607 B CN109811607 B CN 109811607B CN 201910141597 A CN201910141597 A CN 201910141597A CN 109811607 B CN109811607 B CN 109811607B
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Abstract
The invention discloses a light high embankment structure of a mountain steep slope section beneficial to disaster prevention and a construction method, belongs to the field of highways, and aims to improve the disaster prevention and reduction capability of the mountain steep slope and a high fill section, and improve the structural safety of important sections of traffic facilities in the mountain area and the capability of quickly recovering traffic under disaster conditions. The reinforced concrete roadbed comprises a reinforced concrete pile foundation embedded in a bearing layer, a reinforced concrete bearing platform supported at the top end of the reinforced concrete pile foundation and connected with a reinforced concrete pile foundation and a light soil roadbed filled above the reinforced concrete bearing platform. According to the invention, the road section which can only be provided with the bridge in the conventional way is changed into a roadbed structure form, and the existing damaged bridge is repaired by adopting the structure, so that the stability of the steep slope embankment is improved, the influence of river-facing roadbed filling on a river channel is avoided, and the difficult problem of roadbed filling of the steep slope, river-facing and high-fill road sections is effectively solved; meanwhile, the occupied area is reduced; the light high embankment structure greatly improves the traffic guarantee capacity of the road section and reduces the life cycle cost.
Description
Technical Field
The invention belongs to the field of highways, and particularly relates to a light high embankment structure for a mountain steep slope and a high fill road section, which is favorable for disaster prevention, and a construction method thereof.
Background
The mountain highway is arranged on the mountain surface as a strip building and is very easy to be threatened by geological disasters such as collapse, landslide, debris flow and the like. Particularly, for steep slopes and high fill road sections, one side is adjacent to a mountain, the other side is adjacent to a river or a cliff, since a mountain is depressed from the side where the side of the river or the cliff is located to the side where a mountain body is located, the fill height is high, the cross slope is steep, and the retaining wall is difficult to arrange and the roadbed is difficult to form, so that only bridges can be erected for crossing. However, the bridge has weak disaster-resistant capability, is a key node for engineering construction, is also an object needing important protection during operation, is easy to be damaged due to collapse, falling rocks and the like above, so that the bridge is damaged and even the traffic of the road section is interrupted, and meanwhile, the bridge has high emergency and maintenance difficulty, long period and difficulty in recovering the traffic in a short time. When later-stage operation maintenance and restoration reconstruction are carried out, a bridge is reinforced or a bridge span is newly built on the basis of reinforcing rockfall protection. However, in this method, in consideration of uncertainty of geological disasters, damage is inevitably generated under the influence of next geological disasters, and thus traffic safety risks and repair costs of the road section are greatly increased.
Disclosure of Invention
The invention aims to provide a light high embankment structure for steep slopes and high fill road sections in mountainous areas and a construction method thereof, so as to improve the disaster prevention and reduction capability of the road sections, improve the structural safety of important road sections of traffic facilities in mountainous areas and the capability of quickly recovering traffic under disaster conditions, and further reduce the whole life cycle cost of roads. Meanwhile, the structure can also be used for repairing existing bridges damaged by collapse and falling rocks in the same type of road sections in reconstruction, extension and operation projects, so that the disaster prevention and reduction capability of the road sections is improved, and unnecessary repeated investment is avoided.
The invention adopts the technical scheme that the light high embankment structure of the mountain steep slope section favorable for disaster prevention comprises a reinforced concrete pile foundation, a reinforced concrete bearing platform and a roadbed; the reinforced concrete pile base is embedded in a bearing soil layer or a rock stratum; the reinforced concrete bearing platform is supported at the top end of the reinforced concrete pile foundation and connected with the reinforced concrete pile foundation; the roadbed is a light foam concrete roadbed and is filled above the reinforced concrete bearing platform.
Furthermore, a reinforced concrete protective wall is arranged on the outer side of the reinforced concrete bearing platform, the bottom end of the reinforced concrete protective wall is connected with the reinforced concrete bearing platform, the top end of the reinforced concrete protective wall extends upwards, a pouring cavity is formed by the reinforced concrete protective wall and the reinforced concrete bearing platform in an enclosing mode, and light foam concrete is filled in the pouring cavity to form the roadbed.
Furthermore, if the outer side is near the river, the bank slope is affected by scouring, the system also comprises a foot protection wall, and a filling slope and a facing wall which are formed by filling between the foot protection wall and a reinforced concrete bearing platform near the river; the revetment wall is arranged on the slope surface of the filling side slope, the bottom end of the revetment wall extends to the top of the toe guard wall and is connected with the toe guard wall, and the top end of the revetment wall extends to the bottom of the reinforced concrete bearing platform.
A construction method of a light high embankment structure on a steep slope section in a mountainous area, which is beneficial to disaster prevention,
step one, constructing a reinforced concrete pile foundation; if the outer side is near the river and the bank slope is affected by scouring, the side foot wall and the face wall near the river can be constructed firstly for slope protection, and the reinforced concrete pile foundation is constructed after the construction platform is filled.
Step two, constructing a reinforced concrete bearing platform on the top of the reinforced concrete pile foundation;
step three, respectively pouring reinforced concrete protective walls at two sides above the reinforced concrete bearing platform, wherein the bottom ends of the reinforced concrete protective walls extend into the reinforced concrete bearing platform and are surrounded by the reinforced concrete protective walls and the reinforced concrete bearing platform to form a pouring cavity;
and step four, pouring light foam concrete in the pouring cavity to form the roadbed. Cement paste and foam light soil are prepared and mixed on site, and pumping is adopted for layered pouring;
and further, after the fourth step, backfilling the space between the roadbed and the steep slope to form a rockfall groove.
And further, after the fourth step or before construction, adopting protective measures on the inner side steep slope.
The invention has the beneficial effects that: firstly, the conventional bridge structure form is changed into a roadbed form to pass through, so that the disaster resistance of the road section is greatly improved; secondly, the roadbed is formed by pouring the high pile cap and the light foam concrete, so that the difficult problem of roadbed filling of a steep slope river section is effectively solved; thirdly, the requirement of the roadbed on the bearing capacity of the foundation is reduced, the treatment difficulty of the steep slope river-approaching embankment foundation can be effectively reduced, and the stability of the steep slope embankment is improved; fourthly, no slope needs to be placed on the outer side of the embankment structure, so that the occupied area is reduced, and the influence of riverway filling caused by riverway subgrade filling is avoided; fifthly, the arrangement of the toe wall and the face wall improves the anti-scouring capability of the roadbed and the stability of the bank slope adjacent to the river; and sixthly, measures such as a rockfall groove and a protective net are arranged on the inner side of the road section, comprehensive protection is achieved, and the disaster prevention and reduction capacity of the road section can be effectively improved.
Drawings
FIG. 1 is a plan view of a light high embankment structure for a steep slope section of a mountain area to facilitate disaster prevention according to the present invention;
FIG. 2 is an elevation view of a light high embankment structure on a steep slope section of a mountain area for disaster prevention according to the present invention;
fig. 3 is a sectional view a-a of fig. 2.
In the figure, a reinforced concrete pile foundation 1, a reinforced concrete bearing platform 2, a roadbed 3, a reinforced concrete protective wall 4, a rockfall groove 5, a foot protection wall 6, a filling side slope 7, a facing wall 8 and a protective net 9.
Detailed Description
The invention is further described below with reference to the following figures and examples:
as shown in fig. 1, 2 and 3, the light-weight high embankment structure for the steep slope section of the mountainous area, which is beneficial to disaster prevention, comprises a reinforced concrete pile foundation 1, a reinforced concrete pile cap 2 and a roadbed 3; the reinforced concrete pile foundation 1 is embedded in a holding soil layer or a rock layer; the reinforced concrete bearing platform 2 is supported at the top end of the reinforced concrete pile foundation 1 and connected with the reinforced concrete pile foundation 1; the roadbed 3 is a light foam concrete roadbed and is filled above the reinforced concrete bearing platform 2.
According to the light high embankment structure of the mountain steep slope road section beneficial to disaster prevention, firstly, the road section in the conventional bridge structure form is spanned through the roadbed form, so that the disaster resistance of the road section is improved, and the later-stage operation and repair cost is reduced; secondly, the reinforced concrete pile foundation 1 and the reinforced concrete bearing platform 2 form a high pile bearing platform, so that the roadbed is formed by pouring the light foam concrete on the high pile bearing platform, the outer side of the roadbed does not need to be provided with a space for slope placement and filling, and manual or mechanical compaction is not needed during filling, thereby effectively solving the difficult problem of filling the high-fill roadbed at the section of the steep slope adjacent to the river; thirdly, the self-weight of the roadbed 3 filled with the light foam concrete is reduced, so that the bearing capacity requirement of the roadbed 3 on the foundation is reduced, the treatment difficulty of the steep slope river-approaching embankment foundation can be effectively reduced, and the stability of the steep slope embankment is improved.
In order to facilitate the pouring of the roadbed, preferably, a reinforced concrete protection wall 4 is arranged on the outer side of the reinforced concrete bearing platform 2, and the arrangement of the reinforced concrete protection wall 4 firstly forms a light foam concrete filling template to limit the filling amount of the light foam concrete and avoid waste; and secondly, the bottom end of the reinforced concrete protective wall 4 is connected with the reinforced concrete bearing platform 2, so that the light foam concrete is filled in a pouring cavity surrounded by the reinforced concrete protective wall 4 and the reinforced concrete bearing platform 2, and the reinforced concrete protective wall 4, the reinforced concrete bearing platform 2 and the roadbed 3 filled with the light foam concrete form a whole to protect the roadbed 3.
In order to improve the anti-scouring capability of the roadbed and the stability of the waterside slope, preferably, as shown in fig. 3, the roadbed further comprises a foot wall 6, a filling slope 7 formed by filling between the foot wall 6 and the reinforced concrete bearing platform 2 and a facing wall 8; the face protection wall 8 is arranged on the slope surface of the filling side slope 7, the bottom end of the face protection wall extends to the top of the toe protection wall 6 and is connected with the toe protection wall 6, and the top end of the face protection wall extends to the bottom of the reinforced concrete bearing platform 2.
The construction method of the light high embankment structure of the mountain steep slope section beneficial to disaster prevention comprises the following steps of firstly, constructing a reinforced concrete pile foundation 1; if the outer side of the road section is near the river and the bank slope is influenced by scouring, constructing a side foot wall 6 near the river, a filling side slope 7 and a facing wall 8 for slope protection, and constructing a reinforced concrete pile foundation 1 after filling a construction platform to prevent the scouring from influencing the stability of the bank slope;
step two, constructing a reinforced concrete bearing platform 2 on the top of the reinforced concrete pile foundation 1;
step three, respectively pouring reinforced concrete protective walls 4 on two sides above the reinforced concrete bearing platform 2, wherein the bottom ends of the reinforced concrete protective walls 4 extend into the reinforced concrete bearing platform 2, and the reinforced concrete protective walls 4 and the reinforced concrete bearing platform 2 surround to form a pouring cavity;
and step four, forming light foam concrete by manufacturing and mixing cement slurry and foam light soil on site, and pouring the light foam concrete in a pouring cavity by pumping and layering to form the roadbed 3.
In order to collect the falling rocks above and avoid the falling rocks from rolling down to the road surface to damage the road surface, preferably, after the fourth step, a rock falling groove 5 is formed between the roadbed 3 and the steep slope in a backfilling mode.
After the fourth step or before construction, a protective measure is adopted on the inner side steep slope, so that the protective effect is further achieved, and the construction and operation safety is improved. The adopted protective measures comprise cleaning dangerous rocks and boulders loose on the original inner side steep slope, and arranging protective nets 9 such as active nets and passive nets on the steep slope.
The light-duty high embankment structure of mountain area steep slope highway section that does benefit to disaster prevention not only is applicable to the road of newly-built, still is applicable to the restoration after existing bridge damage in the later stage operation maintenance, resumes to rebuild, rebuild project, and concrete repair method is as follows:
step one, removing a bridge span of a steep slope bridge section, and only reserving pier columns and abutment;
secondly, cutting off the pile foundation of the original bridge pier column to a design elevation;
step three, constructing a toe guard wall 6 and a face guard wall 8 on the waterside side of the steep slope bridge section to perform slope protection, filling a construction platform from the top surface of the toe guard wall 6 to the bottom surface of the reinforced concrete bearing platform 2 along the slope, and arranging the face guard wall 8 on the outer side of the slope;
constructing a newly added reinforced concrete pile foundation 1 between the pier studs;
and fifthly, constructing a reinforced concrete bearing platform 2 on the tops of the pier stud and the newly-added reinforced concrete pile foundation 1, pouring reinforced concrete protective walls 4 on the reinforced concrete bearing platform 2 in sections, and filling a roadbed 3, wherein the roadbed 3 is formed by pouring light foam concrete.
According to the invention, firstly, the original bridge structure is changed into the roadbed by the repairing method, so that the disaster resistance of the road section is improved, the service life of the road section is prolonged, and the maintenance cost of later-stage operation is reduced; secondly, the pier columns and the abutment are kept to play a supporting role, the original structure is fully utilized, the number of newly-built reinforced concrete pile foundations 1 and the number of demolished and abandoned sides are reduced, and accordingly the repair engineering quantity is reduced; thirdly, supporting the reinforced concrete bearing platform 2 through the reinforced concrete pile foundation 1 and the pier stud to form a bearing platform and pile group foundation, and bearing the roadbed filling requirement together; fourthly, the arrangement of the foot protection wall 6 and the face protection wall 8 improves the overall anti-scouring capability of the roadbed and the stability of the bank slope adjacent to the river. And step four, after the step three, the skirting wall 6 can stabilize the side slope and form a platform for constructing the reinforced concrete pile foundation 1. And in the second step, when the pier stud is cut off, chiseling out the surface concrete of the pier stud at the cut-off position of the pier stud, and reserving the reinforcing steel bars, wherein in the fifth step, the reserved reinforcing steel bars of the pier stud extend into the reinforced concrete pile foundation 1 and are cast with the reinforced concrete pile foundation 1 into a whole.
Preferably, when the roadbed 3 is poured, firstly, the reinforced concrete protective walls 4 are respectively poured on two sides above the reinforced concrete bearing platform 2, the bottom ends of the reinforced concrete protective walls 4 extend into the reinforced concrete bearing platform 2, and the reinforced concrete protective walls 4 and the reinforced concrete bearing platform 2 surround to form a pouring cavity; then, pouring the light foam concrete in the pouring cavity.
The reinforced concrete protective wall 4 plays a role of pouring a template and also plays a role of limiting the relative position of the roadbed 3 and the reinforced concrete bearing platform 2.
Claims (4)
1. Do benefit to light-duty high embankment structure in mountain area abrupt slope highway section of disaster prevention, its characterized in that: comprises a reinforced concrete pile foundation (1), a reinforced concrete bearing platform (2) and a roadbed (3); the reinforced concrete pile foundation (1) is embedded in a foundation bearing soil layer or a rock stratum; the reinforced concrete bearing platform (2) is supported at the top end of the reinforced concrete pile foundation (1) and connected with the reinforced concrete pile foundation (1); a high pile cap is formed by a reinforced concrete pile foundation (1) and a reinforced concrete cap (2); the roadbed (3) is a light foam concrete roadbed and is filled above the reinforced concrete bearing platform (2);
a reinforced concrete protective wall (4) is arranged on the outer side of the reinforced concrete bearing platform (2), the bottom end of the reinforced concrete protective wall (4) is connected with the reinforced concrete bearing platform (2), the top end of the reinforced concrete protective wall extends upwards, a pouring cavity is formed by the reinforced concrete protective wall (4) and the reinforced concrete bearing platform (2) in an enclosing mode, and light foam concrete is filled in the pouring cavity to form the roadbed (3);
the concrete pile also comprises a foot protection wall (6), a filling side slope (7) and a facing wall (8) which are formed by filling between the foot protection wall (6) and the reinforced concrete bearing platform (2) on the side close to the river; the face protection wall (8) is arranged on the slope surface of the filling side slope (7), the bottom end of the face protection wall extends to the top of the foot protection wall (6) and is connected with the foot protection wall (6), and the top end of the face protection wall extends to the bottom of the reinforced concrete bearing platform (2).
2. The construction method of the light high embankment structure on the steep slope section in the mountainous area for disaster prevention according to claim 1, wherein:
step one, constructing a reinforced concrete pile foundation (1);
step two, constructing a reinforced concrete bearing platform (2) on the top of the reinforced concrete pile foundation (1);
step three, respectively pouring reinforced concrete protective walls (4) at two sides above the reinforced concrete bearing platform (2), wherein the bottom ends of the reinforced concrete protective walls (4) extend into the reinforced concrete bearing platform (2), and the reinforced concrete protective walls (4) and the reinforced concrete bearing platform (2) surround to form a pouring cavity;
and step four, pouring light foam concrete in the pouring cavity to form the roadbed (3).
3. The construction method of the light high embankment structure on the steep slope section in the mountainous area for disaster prevention according to claim 2, wherein: and fourthly, backfilling a rockfall groove (5) between the roadbed (3) and the steep slope.
4. The construction method of the light high embankment structure on the steep slope section in the mountainous area for disaster prevention according to claim 2 or 3, wherein: and after the fourth step or before construction, adopting protective measures on the inner side steep slope.
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| CN203361033U (en) * | 2013-05-27 | 2013-12-25 | 中铁工程设计咨询集团有限公司 | Protective device for intercepting falling rocks of through cut |
| CN203742230U (en) * | 2014-03-06 | 2014-07-30 | 贵州正业工程技术投资有限公司 | Prevention and treatment structure for karst depression escarpment collapse |
| CN206385411U (en) * | 2016-08-31 | 2017-08-08 | 四川省交通运输厅交通勘察设计研究院 | It is a kind of to prevent the steep embankment ruggedized construction of height of differential settlement |
| CN108374358A (en) * | 2018-05-09 | 2018-08-07 | 中铁二院工程集团有限责任公司 | A kind of rockfall is passively blocked construction |
| CN108951335A (en) * | 2018-09-06 | 2018-12-07 | 四川省交通运输厅公路规划勘察设计研究院 | A kind of light-duty escarpment road structure |
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