CN109750682B - Construction method of rigid-flexible combined ecological slope protection of foam concrete roadbed side slope - Google Patents
Construction method of rigid-flexible combined ecological slope protection of foam concrete roadbed side slope Download PDFInfo
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Abstract
The invention relates to a rigid-flexible combined type ecological slope protection construction method for a foam concrete roadbed side slope, which mainly comprises the following construction steps: expanding foundation construction, pouring a first layer of foam concrete, backfilling a first layer of backfill soil, constructing vertical slope protection in a layered mode, and constructing slope protection on an upper slope. According to the invention, the vertical slope protection part is provided with the vertical tied grass planting building blocks at intervals to form rigid protection, the built-in grass planting bags and the backfilled geonet are arranged in layers to form flexible protection, and meanwhile, the slope protection part is provided with the grass blanket outside the geonet to form a composite ecological system of the grass planting building blocks, the grass planting bags and the grass blanket. The construction method provided by the invention overcomes the problems of large occupied space, long construction period, easy deformation, easy loss of surface soil, easy collapse and sliding of side slope and the like in the traditional roadbed side slope protection technology, and has the advantages of high construction speed, good safety performance, large bearing capacity and strong stability of a slope protection system, and obvious economic technology and environmental protection benefits.
Description
Technical Field
The invention relates to a construction method of a rigid-flexible combined type ecological slope protection system for a high-steep foam concrete roadbed side slope, belongs to the field of slope protection engineering, and is suitable for roadbed side slope ecological protection engineering, in particular to high-steep foam concrete roadbed side slope ecological protection engineering.
Background
The foam concrete has the characteristics of light weight, good self-supporting property, high construction speed, good earthquake resistance, good sound and heat insulation effect, good fire resistance and water resistance, and is particularly suitable for highway engineering roadbed construction with high height, steep slope, soft foundation as a base, small land occupation range of an embankment and short construction period. However, in the slope greening protection of the high and steep foam concrete roadbed, the following difficulties exist: firstly, because no plant growing condition exists on the side slope of the roadbed, soil is needed to be removed during greening; secondly, because the height of the roadbed is generally more than 30m, and the land using range of the embankment is small, the greening slope protection form of slope relief cannot be used; thirdly, for the vertically poured foam concrete roadbed, landslides and slope surface water and soil loss are more easily caused on the greening side slope; and fourthly, considering that the engineering period of selecting the foam concrete as the roadbed material is generally tense, the protection system is required to have certain construction convenience and high efficiency. The traditional grass bag planting slope protection technology generally adopts a slope protection form of slope release, occupies more space for embankment land, and has longer construction period; in addition, the tensile strength between the material and the roadbed is poor, and the material is easy to deform under the action of external force; in addition, the grass planting bag revetment is also easy to cause slope disasters such as slope gully, surface soil loss, slump and the like under the rain erosion, thus leading to a large amount of slope disease remediation and repair engineering.
Therefore, in order to effectively solve the problems, the invention is especially important to develop a slope protection system which has small occupied space, reliable quality, quick construction, time and labor saving and good water and soil conservation performance.
Disclosure of Invention
The invention aims to solve the problems of large occupied space, long construction period, easy deformation, easy loss of surface soil, easy collapse and slide of a side slope, high rework repair rate and the like of the traditional grass planting bag slope protection technology, and provides a construction method of a rigid-flexible combined ecological slope protection system for the side slope of a high-steep foam concrete roadbed.
In order to achieve the technical purpose, the invention adopts the following technical scheme.
The rigid-flexible combined type ecological slope protection system for the high-steep foam concrete roadbed side slope is characterized in that: the concrete pile comprises grass planting building blocks, a core column, a non-dismantling template, a geotechnical net, a steel pipe, a tie screw, a steel wire rope and an enlarged foundation; the grass planting building block is of a thin-wall formwork structure, the back surface of the grass planting building block is provided with a vertical filling hole, and the front surface of the grass planting building block is provided with a planting groove; constructing grass planting building blocks sequentially from bottom to top on the basis of the expansion, configuring reinforcing ribs in vertically through holes formed by vertical pouring holes and pouring concrete to form reinforcing core columns; two ends of the geonet are poured in the foam concrete roadbed, the inside of the geonet is filled with backfill, and grass planting bags are stacked on the outer side close to the side slope; one end of the tie screw is screwed in the threaded sleeve, and the other end of the tie screw is fixed on the grass planting building block; one end of the steel wire rope is wound and fixed in the limiting ring, and the other end of the steel wire rope is tied on the pull ring in a pulling mode.
The grass planting building block is reserved or drilled with a screw hole.
The upper end and the lower end of the non-dismantling template are provided with a tongue-and-groove, and the back is provided with a pull ring and a preformed hole.
The steel pipe is provided with a limiting ring and a threaded sleeve.
The construction method of the rigid-flexible combined ecological slope protection of the foam concrete roadbed side slope is characterized by comprising the following steps of:
s1: measuring and lofting according to design requirements, marking out a non-dismantling template, a grass planting building block and a steel pipe position line, and uniformly inserting steel pipes at the edge of the foam concrete roadbed;
s2: digging a groove at the building position of the grass planting building block, wherein the size of the groove is slightly larger than that of the bottom surface of the grass planting building block, and reinforcing ribs are arranged in the groove and concrete is poured to form an enlarged foundation;
s3: before the disassembly-free template is installed, the geonet is pre-laid at a specified position, and one end of the geonet is ensured to be laid in the foam concrete roadbed; then, covering a layer of cement mortar at the mounting position of the non-dismantling template, embedding and pressing the non-dismantling template on the geonet for masonry and fixation, and tying the non-dismantling template on the steel pipe through a steel wire rope; secondly, one end of a tie screw penetrates through a preformed hole in the non-dismantling template and is screwed into a threaded sleeve on the steel pipe, and after the non-dismantling template in the construction section is completely installed and fixed, foam concrete is poured;
s4: building a first skin grass planting building block on the basis of expansion, and stacking grass planting bags on the outer side close to the side slope; turning the other end of the pre-laid geonet and placing the geonet on a grass planting bag; after the first skin grass planting building block and the grass planting bag are constructed, filling a layer of backfill soil on the geotechnical net; spreading and laying the geotextile reversely wrapped on the grass planting bag on the backfilled backfill soil and the poured foam concrete;
s5: repeating S3-S4 until the design height is reached, and pouring fine aggregate concrete into the vertical pouring holes when 2-3 grass planting building blocks are constructed;
s6: after the vertical part slope protection construction is finished, foam concrete layered pouring and layered backfill construction are carried out with reference to S3 and S4; after the roadbed is completely filled, a leveling soil layer is laid on the slope, and a grass blanket is laid and fixed on the slope through a tether;
s7: and after the composite ecological slope protection system is completely constructed, filling planting soil and green plants or grass seeds into the planting grooves of the grass planting building blocks, and maintaining in time.
The invention has the following characteristics and beneficial effects:
(1) the grass planting building blocks of vertical drawknot of interval arrangement form the rigidity protection, and the layering arranges the geotechnological net of stacking grass planting bag and backfill and forms the flexible protection, forms "just + gentle" combined type bank protection system. Compared with a single rigid revetment, the consumption of materials such as concrete is saved; the single flexible bank protection of contrast has improved the steadiness of slope protection system greatly. The constructed composite slope protection system has large bearing capacity and good stability;
(2) the vertical slope protection part is provided with grass planting building blocks and a geonet with grass planting bags stacked on the outer side, the slope protection part is bound with grass blankets by means of the geonet, a composite ecological system is formed by the grass planting building blocks, the grass planting bags and the grass blankets, the environmental protection performance is outstanding, and the greening effect is obvious;
(3) the steel pipe and the grass planting building block are connected through the tie screw, so that the stable installation of the grass planting building block is ensured; the disassembly-free template and the steel pipe are tied by the steel wire rope so as to avoid the template from overturning in the roadbed pouring process; the core column is formed by arranging the reinforcing ribs in the vertical filling holes and filling fine aggregate concrete so as to realize vertical tie between the grass planting building blocks. The construction safety is good, and the integrity is good;
(4) by adopting a layered construction mode, the roadbed pouring and the construction of the outer slope protection structure are synchronously carried out in each layer of construction, and the construction processes of pre-laying of the geotechnical mesh, installation of a non-dismantling template, roadbed pouring, backfill filling, grass planting brick building and reverse covering of the geotechnical mesh are formed in each layer of construction, so that compared with the separation construction of the roadbed and the protection system in the traditional construction, the construction efficiency is greatly improved, and the construction period is shortened;
(5) the grass planting building blocks, the disassembly-free templates and the grass planting blankets are all prefabricated in factories, so that the field operation amount is small, and the construction speed is high;
(6) the foam concrete is selected as a roadbed material, has light weight, good flowability, strong self-standing property, good waterproofness and durability, and can effectively reduce the filling load compared with common concrete, thereby eliminating the settlement of the filler after construction; during construction, only the foam concrete is needed to be pumped by the piping, and mechanical vibration and rolling are not needed; and the construction does not need to be carried out.
Drawings
FIG. 1 is a side view of a rigid-flexible combined ecological slope protection of a high-steep foam concrete roadbed side slope;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a sectional view taken along line B-B of FIG. 1;
FIG. 4 is a perspective view of a grass planting block;
FIG. 5 is a cross-sectional view taken along line C-C of FIG. 4;
FIG. 6 is a cross-sectional view of a non-demolition template;
FIG. 7 is a cross-sectional view of a steel pipe;
FIG. 8 is a schematic view of a first layer of foam concrete placement;
FIG. 9 is a schematic illustration of a first layer of backfill soil backfill;
FIG. 10 is a schematic view of the slope protection construction of the vertical section of the second layer;
FIG. 11 is a schematic view of the slope protection construction of the vertical section on the nth layer;
FIG. 12 is a schematic top foam concrete pour;
fig. 13 is a schematic diagram of grass blanket laying.
In the figure: 1. the concrete planting method comprises the following steps of grass blankets, 2 tethers, 3 soil engineering nets, 4 leveling soil layers, 5 grass planting building blocks, 501 planting grooves, 502 vertical pouring holes, 503 screw rod holes, 6 tie screw rods, 7 nuts, 8 steel pipes, 801 limiting rings, 802 threaded sleeves, 9 disassembly-free templates, 901 pull rings, 902 rabbet, 903 reserved holes, 10 backfill, 11 core columns, 12 steel wire ropes, 13 enlarged foundations, 14 foam concrete foundations, 15 reinforcing ribs and 16 grass planting bags.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, and the following examples are illustrative of the present invention and are not limited to the following examples. The construction of a concrete roadbed side slope is carried out, the roadbed height is 8m, and a rigid-flexible combined type ecological slope protection system and a construction method of the high-steep foam concrete roadbed side slope are adopted.
As shown in fig. 1, the grass planting building blocks 5 are arranged at intervals of 1000mm along the horizontal direction of the roadbed, and the building height is 7100 mm; the grass blanket 1 is a factory finished product, and the lap joint width is 250 mm; the tether 2 is a composite fiber rope, and the longitudinal and transverse arrangement intervals are 300 mm.
As shown in fig. 2 and 3, the high-steep foam concrete roadbed slope rigid-flexible combined type ecological slope protection system comprises grass planting building blocks 5, a core column 11, a disassembly-free template 9, a geotechnical net 3, a steel pipe 8, a tie screw 6, a steel wire rope 12 and an enlarged foundation 13; constructing grass planting building blocks 5 on an enlarged foundation 13 from bottom to top in sequence, arranging reinforcing ribs 15 in vertically through holes formed by vertical pouring holes 502 and pouring concrete to form a reinforcing core column 11, wherein the section size of the enlarged foundation 13 is 350mm multiplied by 350 mm; the geonet 3 is a composite fiber net, two ends of the geonet are poured in the foam concrete roadbed 14, backfill 10 is filled in the geonet 3, grass planting bags 16 are stacked on the outer side close to the side slope, the geonet 3 on the slope is bound with grass blankets 1 through tied ropes 2, and the height of the backfill 10 in each layer of the geonet 3 is 300 mm; one end of a tie screw 6 is screwed in the threaded sleeve 802, the other end of the tie screw is fixed on the grass planting building block 5, and the tie screws 6 are arranged one by one at intervals of 1000 mm; one end of the steel wire rope 12 is wound and fixed in the limiting ring 801, the other end of the steel wire rope is tied on the pull ring 901, and the steel wire ropes 12 are arranged at intervals of 300 mm.
As shown in fig. 4 and 5, the grass planting building block 5 is a thin-walled formwork structure, the back surface of the grass planting building block is provided with a vertical pouring hole 502, the front surface of the grass planting building block is provided with a planting groove 501, the grass planting building block 5 has the dimensions of 500mm in length, 300mm in height, 300mm in width and 30mm in wall thickness, and the vertical pouring hole 502 has the plane dimension of 440mm × 120 mm.
As shown in fig. 6, the non-dismantling formwork 9 is of a reinforced concrete structure, the upper end and the lower end of the non-dismantling formwork are provided with a rabbet 902, a pull ring 901 is embedded in the back of the non-dismantling formwork, and a prepared hole 504 is arranged, the non-dismantling formwork 9 is 500mm long, 300mm high and 30mm thick, and the protruding and recessed dimensions of the rabbet 902 are 15mm × 15 mm.
As shown in fig. 7, two steel rings are welded on the outer side of the steel pipe 8 to form a limiting ring 801, threaded sleeves 802 are uniformly welded on the outer side of the steel pipe 8, the spacing between the limiting rings 801 is 300mm, and the spacing between the threaded sleeves 802 is 900 mm.
As shown in fig. 8 to 13, before the non-dismantling formwork is installed, the geonet 3 is pre-laid at a specified position, and one end of the geonet 3 is ensured to be laid in the foam concrete roadbed 14; then, covering a layer of cement mortar at the installation position of the non-dismantling template 9, embedding the non-dismantling template 9 on the geonet 3 for masonry and fixation, and tying the non-dismantling template on the steel pipe 8 through a steel wire rope 12; and secondly, one end of the tie screw 6 penetrates through a preformed hole 903 in the non-dismantling template 9 and is screwed into a threaded sleeve 802 on the steel pipe 8, and after the non-dismantling template 9 in the construction section is completely installed and fixed, foam concrete is poured. Building a first skin grass planting building block 5 on the enlarged foundation 13, and stacking grass planting bags 16 on the outer side close to the side slope; turning the other end of the pre-laid geonet 3 back and placing the other end on a grass planting bag 16; after the first skin grass planting building block 5 and the grass planting bag 16 are constructed, filling a layer of backfill 10 on the geotechnical net 3; the geotextile 3 placed on the grass planting bag 16 in the reverse wrapping mode is unfolded and laid on the backfilled backfill soil 10 and the poured foam concrete. And (3) by analogy, foam concrete is poured in a layered mode, backfilling is conducted in a layered mode until the design height is reached, and meanwhile, fine aggregate concrete is poured into the vertical pouring hole 502 every time 2-3 skin grass planting building blocks 5 are constructed. After the roadbed is completely filled, a leveling soil layer 4 is laid on the slope, and a grass blanket 1 is laid and fixed on the slope through a tether.
The main construction process of the rigid-flexible combined ecological protection slope of the high-steep foam concrete roadbed side slope is as follows:
step one, construction preparation: and measuring and lofting according to design requirements, marking the position lines of the non-dismantling template 9, the grass planting building blocks 5 and the steel pipes 8, and uniformly inserting the steel pipes 8 at the edge of the foam concrete roadbed.
Step two, expanding foundation construction: digging a groove at the building position of the grass planting building block 5, wherein the size of the groove is slightly larger than that of the bottom surface of the grass planting building block 5, arranging a reinforcing rib 15 in the groove and pouring concrete to form an enlarged foundation 13;
step three, pouring the first layer of foam concrete: before the disassembly-free template is installed, the geonet 3 is pre-laid at a specified position, and one end of the geonet 3 is ensured to be laid in the foam concrete roadbed 14; then, covering a layer of cement mortar at the installation position of the non-dismantling template 9, embedding the non-dismantling template 9 on the geonet 3 for masonry and fixation, and tying the non-dismantling template on the steel pipe 8 through a steel wire rope 12; and secondly, one end of the tie screw 6 penetrates through a preformed hole 903 in the non-dismantling template 9 and is screwed into a threaded sleeve 802 on the steel pipe 8, and after the non-dismantling template 9 in the construction section is completely installed and fixed, foam concrete is poured.
Step four, backfilling the first layer of backfill soil: building a first skin grass planting building block 5 on the enlarged foundation 13, and stacking grass planting bags 16 on the outer side close to the side slope; turning the other end of the pre-laid geonet 3 back and placing the other end on a grass planting bag 16; after the first skin grass planting building block 5 and the grass planting bag 16 are constructed, filling a layer of backfill 10 on the geotechnical net 3; spreading the geotextile 3 placed on the grass planting bag 16 in the reverse wrapping manner and paving the geotextile on the backfilled backfill soil 10 and the poured foam concrete;
step five, layered construction of vertical slope protection: and repeating the third step and the fourth step until the design height is reached, and pouring the fine aggregate concrete into the vertical pouring holes 502 every time 2-3 grass planting building blocks 5 are constructed.
Step six, constructing the slope protection of the upper slope: after the vertical part slope protection construction is finished, foam concrete pouring and backfill construction are carried out according to the third step and the fourth step; after the roadbed is completely filled, a leveling soil layer 4 is laid on the slope, and a grass blanket 1 is laid and fixed on the slope through a tether.
Seventhly, greening construction: after the side slope is completely constructed, planting soil and green plants or grass seeds are filled in the planting grooves 501 of the grass planting building blocks 5, and timely maintenance is carried out.
The present invention has been described in detail with reference to the embodiments, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (1)
1. The construction method of the rigid-flexible combined ecological slope protection of the foam concrete roadbed side slope is characterized by comprising the following steps of:
s1: measuring and lofting according to design requirements, marking out position lines of a non-dismantling template (9), a grass planting building block (5) and a steel pipe (8), and uniformly inserting the steel pipe (8) at the edge of the foam concrete roadbed;
s2: digging a groove at the building position of the grass planting building block (5), wherein the size of the groove is slightly larger than that of the bottom surface of the grass planting building block (5), and a reinforcing rib (15) is arranged in the groove and concrete is poured to form an enlarged foundation (13);
s3: before the disassembly-free template is installed, the geonet (3) is pre-paved at a designated position, and one end of the geonet (3) is guaranteed to be paved into the foam concrete roadbed (14); then, covering a layer of cement mortar at the installation position of the non-dismantling template (9), embedding the non-dismantling template (9) on the geonet (3) for masonry and fixation, and drawing and connecting the non-dismantling template on the steel pipe (8) through a steel wire rope (12); secondly, one end of a tie screw (6) penetrates through a preformed hole (903) in the non-dismantling template (9) and is screwed into a threaded sleeve (802) on the steel pipe (8), and after the non-dismantling template (9) in the construction section is completely installed and fixed, foam concrete is poured;
s4: building a first skin grass planting building block (5) on the enlarged foundation (13), and stacking grass planting bags (16) on the outer side close to the side slope; turning the other end of the pre-laid geonet (3) back and placing the other end on a grass planting bag (16); after the first skin grass planting building block (5) and the grass planting bag (16) are constructed, filling a layer of backfill (10) on the geonet (3); spreading and laying the geotextile (3) reversely wrapped on the grass planting bag (16) on the backfilled backfill soil (10) and the poured foam concrete;
s5: repeating S3-S4 until the design height is reached, and pouring fine aggregate concrete into the vertical pouring holes (502) every time 2-3 grass planting building blocks (5) are constructed;
s6: after the vertical part slope protection construction is finished, foam concrete layered pouring and backfill layered construction are carried out with reference to S3 and S4; after the roadbed is completely filled, a leveling soil layer (4) is laid on the slope, and a grass blanket (1) is laid and fixed on the slope through a tether;
s7: after the composite ecological slope protection system is completely constructed, planting soil and green plants or grass seeds are filled in the planting grooves (501) of the grass planting building blocks (5), and timely maintenance is carried out.
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| CN110482709B (en) * | 2019-09-23 | 2024-08-09 | 江苏省农业科学院 | Dynamic treatment structure and method for composite pollution type branch creek water body before confluence |
| CN111305152A (en) * | 2020-03-25 | 2020-06-19 | 杭州昂创科技有限公司 | Construction method for ecological protection of stepped three-dimensional reinforced abutment conical slope |
| CN115053783B (en) * | 2022-05-26 | 2024-06-04 | 武汉南方旭域科技工程有限公司 | Slope support greening process |
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| KR100770162B1 (en) * | 2007-08-13 | 2007-10-25 | (주)우주엔지니어링 | Planting block establish structure |
| CN103410167B (en) * | 2013-08-29 | 2015-07-15 | 深圳市福田建安建设集团有限公司 | Three-dimensional reinforced rigid-soft composite ecological retaining wall and construction method |
| CN205530337U (en) * | 2016-02-02 | 2016-08-31 | 广西进联德环保工程有限公司 | Ecological retaining wall system |
| CN105780618B (en) * | 2016-03-24 | 2018-04-27 | 杭州江润科技有限公司 | A kind of prefabricated board is to stretching vertical no slope embankment and construction method |
| CN206553851U (en) * | 2017-01-20 | 2017-10-13 | 杭州市交通规划设计研究院 | roadbed widening structure |
| CN109024665A (en) * | 2018-09-11 | 2018-12-18 | 四川睿铁科技有限责任公司 | A kind of building-brick type reinforced earth bulkhead and its construction method |
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