CN115748345A - Construction method suitable for widening roadbed in adjacent pond section - Google Patents
Construction method suitable for widening roadbed in adjacent pond section Download PDFInfo
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- CN115748345A CN115748345A CN202211532800.9A CN202211532800A CN115748345A CN 115748345 A CN115748345 A CN 115748345A CN 202211532800 A CN202211532800 A CN 202211532800A CN 115748345 A CN115748345 A CN 115748345A
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- 238000010276 construction Methods 0.000 title claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 239000004575 stone Substances 0.000 claims abstract description 65
- 239000004567 concrete Substances 0.000 claims abstract description 43
- 239000000945 filler Substances 0.000 claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 239000002002 slurry Substances 0.000 claims abstract description 17
- 239000002689 soil Substances 0.000 claims abstract description 17
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims description 57
- 239000010802 sludge Substances 0.000 claims description 21
- 239000002023 wood Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
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- 239000011229 interlayer Substances 0.000 claims description 4
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- 239000004576 sand Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000011449 brick Substances 0.000 claims description 2
- 239000011440 grout Substances 0.000 description 19
- 238000005056 compaction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
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Abstract
The invention relates to a construction method suitable for widening a roadbed at an adjacent pond section, which comprises the following steps of surveying the natural landform condition of the widened position of the roadbed at the adjacent pond section on site, establishing a soil weir divided water area by measuring site paying off, pumping and discharging water constructed in the weir, dredging to a thickness of more than 50cm, reinforcing the pit bottom by using a fir pile after dredging, paving a C30 concrete enlarged foundation on the top of the fir pile, building a slurry slice stone retaining wall at the upper end of the concrete enlarged foundation, compacting a slope surface of the foundation, and compacting a water-permeable filler at a section between the inner side surfaces of the slurry slice stone retaining wall and the concrete enlarged foundation and the compacted slope surface of a three-stage step foundation. The invention can reduce the expanded floor area, reduce the construction cost, improve the construction efficiency and ensure the stability of the widened structure.
Description
Technical Field
The invention relates to a construction method suitable for widening a roadbed in an adjacent water or fish pond section.
Background
Most of rural roads in China are mainly cement concrete pavements, the number of motor vehicles in rural areas in early years is small, the requirement on driving comfort is not high, and the rural roads are limited by economic conditions, the investment scale is small, and the road surface is narrow 22473. However, with the increase of the number of motor vehicles in rural areas in recent years, the concrete pavement in the early years cannot meet the increasing traffic demand of society. Therefore, upgrading and modifying the original highway is imperative, the key point of upgrading and modifying the highway is to widen the original roadbed, but in the area with densely distributed water networks, the situation that the constructed road needs to be adjacent to water or fishpond areas such as rivers, lakes and the like is often encountered, the generally adopted construction mode is a mode of filling soil from land to the water area for propelling construction, and the construction mode has the following defects:
1. because the underwater roadbed can not be compacted in a layering way, the compaction degree is ensured by adopting water permeable fillers such as medium sand and the like, so that the construction cost is high, the original underwater floating mud reduces the strength of the expanded roadbed, and leads the expanded roadbed to sink and the expanded road surface to sink;
2. the widened roadbed usually adopts the following steps of 1: the slope ratio of 1.5 leads to large occupied land acquisition area, needs open circuit construction, has large removal cost and large requirement on fillers, not only has high cost and long construction period, but also is difficult to ensure a foundation and has large economic influence on a construction area.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a construction method suitable for widening a roadbed in an adjacent pond section, which can reduce the expanded floor area, reduce the construction cost, improve the construction efficiency and ensure the stability of a widened structure.
In order to achieve the purpose, the invention adopts the following technical scheme: a construction method suitable for widening a roadbed of a section adjacent to a pond comprises the following steps:
(1) The method comprises the following steps of surveying the natural landform condition of the location of a widened roadbed section of a water area of an adjacent pond on site, recording the hardness of the surrounding ground, the state of each underground layer, the depth of a wet soft zone of a riverbed and the depth of a water layer in detail, making detailed survey records on site, and designing the work of widening the original roadbed according to the detailed survey records on site in detail;
(2) The roadbed widening construction is carried out in dry water or rainy seasons, the foundation pit excavation is carried out until the foundation is finished, the continuous construction is carried out, the position of the original roadbed needing widening is measured and lofted, and the position needing widening is marked;
(3) Extending outward by 5m along the outer side line of a position to be widened of the roadbed, dividing a water area of the pond by an earth cofferdam, forming a roadbed widening construction section at a section between the earth cofferdam and the position line of the original roadbed, and pumping water of the roadbed widening construction section to the pond at the other side of the earth cofferdam or discharging the water to a water storage site preset in advance by using a submersible pump or an open trench; or a water collecting channel which is 1m and 1-1.2 m wide is dug downwards along the ground line of the lower end of the earth cofferdam close to the roadbed to collect water, and the water in the water collecting channel is pumped to the pond on the other side of the earth cofferdam by a submersible pump;
(4) Removing sludge in a widened construction section of a roadbed, measuring the surface elevation of the sludge after drainage before dredging, removing the depth of the sludge to be more than 50cm, airing the sludge with the water content of more than 20% for more than two days, turning over for multiple times, or turning over the sludge in a pond to a construction open space for stacking and airing, and loading and abandoning the sludge in a specified waste soil yard after the sludge is aired until the water content is lower than 10%;
(5) Arranging a water-stop wall, continuously digging a water collecting channel downwards for 1.2m, arranging a clay layer on the side surface of the water collecting channel close to one side of the earth cofferdam, wherein the height of the clay layer is at least 2.2m, the width of the clay layer is 35-50 cm, arranging waterproof plastic cloth on one side surface of the clay layer close to the roadbed, and then filling the rest space of the water collecting channel with soil;
(6) And (3) constructing a fir pile reinforcing area:
(a) Marking pile positions along the pit bottom ground along the line outside the widened roadbed according to the design, wherein the adjacent rows of pile positions are arranged in a staggered manner;
(b) The end head of the thin end of the fir-wood pile is cut into a taper shape, and the peripheral wall of the fir-wood pile is coated with fireproof, anticorrosive and mothproof solvent for treatment before the fir-wood pile is buried;
(c) Driving the fir-wood piles until the upper ends of the fir-wood piles are exposed out of the ground of the pit bottom by 10cm and the upper end surfaces of the fir-wood piles are on the same plane;
(7) Pouring a concrete expansion foundation at the upper end of the fir pile reinforcing area, wherein the height of the concrete expansion foundation is at least 0.5m, the two side edges of the concrete expansion foundation extend to the position 0.5m outside the corresponding two side edges of the fir pile reinforcing area, and the lower end surface of the concrete expansion foundation is connected with the upper end surface of each fir pile;
(8) After the poured concrete enlarged foundation reaches the designed strength, building a grout section stone retaining wall at the upper end of the concrete enlarged foundation, wherein the cross section of the grout section stone retaining wall is trapezoidal, the width of the bottom surface of the grout section stone retaining wall is 1.6-1.8 m, the width of the top surface of the grout section stone retaining wall is 0.8-1 m, the upper end surface of the grout section stone retaining wall is flush with the upper end surface of the pavement structure layer, the upper end surface of the grout section stone retaining wall is longitudinally embedded with the lower end of a guardrail upright post at a spacing distance, the upper end of the guardrail upright post is positioned outside the upper end surface of the pavement structure layer, and the upper end of the grout section stone retaining wall is longitudinally embedded with a water drain pipe transversely penetrating through the grout section stone retaining wall at a spacing distance;
(9) Tamping the foundation slope surface on the inner side surfaces of the slurry slice stone retaining wall and the concrete enlarged foundation and the original foundation slope surface to ensure that the tamped foundation slope surface is distributed in a three-stage step shape;
(10) Filling and compacting layer by using water permeable fillers at a section between the inner side surfaces of the slurry-cut stone retaining wall and the concrete enlarged foundation and the slope surface of the tamped three-stage stepped foundation, wherein the upper layer surface of the water permeable fillers and the lower end surface of the pavement structure layer are on the same plane;
(11) And arranging a pavement structure layer on the upper layer surface of the water-permeable filler and the upper end surface of the tamped foundation slope, wherein the extension surface of the pavement structure layer is positioned in a groove reserved on the side wall of the upper end of the slurry-cut stone retaining wall, the inner side of the upper part of the guardrail upright post is provided with a collision-proof plate, a water collection tank with a rain grate is arranged in the edge part of the pavement structure layer at the upper end of the water drain pipe, and the lower end of the water collection tank is communicated with the upper port of the water drain pipe, so that the construction of widening the roadbed is completed.
As a further description of the above technical solution: the upper end of the water-stop wall is 50cm higher than the bottom ground of the corresponding side of the earth cofferdam, the outer side surface of the upper part of the water-stop wall is attached to the bottom of the corresponding side of the earth cofferdam, and the outer side surface of the water-stop wall is arranged in the interlayer at the bottom of the earth cofferdam.
As a further description of the above technical solution: the fir-tree pile reinforcing area is characterized in that pile positions of the fir-tree pile reinforcing area are arranged in a quincunx shape, the central line distance of fir-tree piles in adjacent rows is 0.45m, and the lower end of each fir-tree pile is positioned in the underground bearing layer.
As a further description of the above technical solution: the concrete enlarged foundation is formed by pouring C30 concrete, and the joint of the upper end surface of the concrete enlarged foundation and the grouted non-blocking wall is roughened.
As a further description of the above technical solution: the thick liquid section stone barricade adopt cement mortar and coarse aggregate to build by laying bricks or stones and form, the minimum length of side of coarse aggregate and middle part thickness are not less than 25cm, the thick liquid section stone barricade side that is close to the road bed side is the perpendicular.
As a further description of the above technical solution: the rammed foundation slope surface is in a three-level stair-step shape, and the ratio of the step size to the width from bottom to top is 1:1:1, the height ratio of the three-stage ladder-shaped step size from bottom to top is 1.3:1: and 1, enabling the upper end face of the ladder at the top end and the lower end face of the pavement structure layer to be on the same plane.
As a further description of the above technical solution: the grain diameter of the permeable filler is less than 10cm, the soil content is not more than 10%, the weight content of broken stones or slag stones with the grain diameter of 1-4 cm is 30-70%, and the balance is gravel soil and sand soil, and the water content is 8-10%.
As a further description of the above technical solution: the drain pipe adopts a PVC drain pipe, and the lower end outlet of the drain pipe is higher than the perennial water level by at least 50cm.
As a further description of the above technical solution: the upper end lateral wall of thick liquid section stone barricade reserve the recess that links up with the road surface structural layer, the up end of thick liquid section stone barricade adopts M10 cement mortar to smear, thick liquid thickness of smearing is 3cm.
As a further description of the above technical solution: the fir-tree piles are driven and pressed by an excavator bucket, the deviation of each pile position after being driven and pressed is controlled to be not more than one half of the diameter of the fir-tree pile, and the allowable deviation of the verticality of the fir-tree pile is less than 2%.
The invention has the following beneficial effects:
1. the invention can perform roadbed widening construction on the adjacent pond area under the condition that the adjacent pond area occupies less area and damages the surrounding environment, and the invention replaces the traditional construction to overcome the defects of large occupied land acquisition area, broken circuit construction, high removal cost, poor roadbed quality and large requirement on filler, reduces the adverse effects on the environment and the economy in the adjacent pond area and saves the secondary land acquisition cost.
Practice proves that by using the construction method for widening the roadbed adjacent to the pond area, the construction area does not exceed 5m of the extension of the widened outer side edge of the roadbed, and the traditional construction at least needs 10m of the extension of the widened outer side edge of the roadbed.
2. The invention can reduce the soil consumption of the traditional soil filling propulsion construction from land to water area by 50 percent, simultaneously can not carry out the open circuit construction, ensures the construction efficiency, improves the construction safety and stability, realizes the standardization, industrialization and rapidness of the roadbed widening construction in the adjacent pond area, and improves the production efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a partial structural view of the water barrier wall according to the present invention.
Illustration of the drawings:
1. slurry slicing stone retaining walls; 2. a drain pipe; 3. a guardrail column; 4. Water-permeable filler; 5. a foundation slope surface; 6. a pavement structure layer; 7. a pond water area; 8. widening a construction section of the roadbed; 9. a cofferdam; 91. an interlayer at the bottom of the cofferdam; 10. a water collecting channel; 11. a fir wood pile; 12. expanding the foundation by using concrete; 13. a support layer; 14. an original roadbed; 15. a water-stop wall; 16. and (4) a groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and in order to make the technical means, the creation features, the achievement purposes and the effects of the present invention easy to understand, the present invention will be further described below with reference to specific embodiments, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments are possible. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention. The methods in the following examples are all conventional methods unless otherwise specified, and materials, devices, apparatuses, and the like used in the following examples are commercially available unless otherwise specified.
Example 1: as shown in fig. 1-2, a construction method for widening roadbed in adjacent pond area includes the following steps:
(1) And (3) carrying out site survey on the natural landform condition of the site of the widened roadbed section of the adjacent pond water area 7, recording the hardness of the peripheral ground, the state of each underground layer, the depth of a wet soft zone of a riverbed and the depth of a water layer in detail, carrying out site survey on the detailed record, and carrying out site survey on the original roadbed according to the site survey on the detailed record to carry out detailed design on widening work.
(2) The roadbed widening construction is carried out in dry water or rainy seasons, the foundation pit excavation is carried out until the foundation is finished, the continuous construction is carried out, the position of the original roadbed 14 needing widening is measured and lofted, and the position needing widening is marked;
(3) The outer side line of the position needing to be widened along the roadbed extends outwards by 5m, the pond water area 7 is divided by an earth cofferdam 9, and the height of the earth cofferdam 9 and the height of the highest water level of the pond water area in the area are limited by adding 1 m. And a section between the earth cofferdam 9 and the original roadbed position line forms a roadbed widening construction section 8. Pumping water in the roadbed widening construction section to a pond on the other side of the earth cofferdam by using a submersible pump or an open trench, or discharging the water to a water storage site preset in advance; or a water collecting channel 10 with the width of 1-1.2 m and the length of 1m is dug downwards along the ground line of the lower end of the earth cofferdam close to the roadbed, and water in the water collecting channel is pumped to the pond on the other side of the earth cofferdam by a submersible pump, so that a construction section 8 is widened on the roadbed to form dry land.
(4) The method comprises the steps of clearing away sludge in a widened construction section of a roadbed, measuring the surface elevation of the drained sludge before dredging, clearing away sludge with the depth larger than 50cm, airing the cleared sludge with the water content larger than 20% for more than two days, turning over for multiple times, or turning over the sludge in a pond to a construction open space to stack and air, and loading and abandoning the sludge in a specified waste soil yard after the sludge is aired until the water content is lower than 10%.
(5) A water-stop wall 15 is arranged for stopping water in a pond water area from permeating into the roadbed widening construction section from the underground and keeping the water content of the roadbed widening section; and continuously digging a water collecting channel for 1.2m downwards, arranging a clay layer on the side surface of the water collecting channel close to one side of the earth cofferdam, wherein the height of the clay layer is at least 2.2m, the width of the clay layer is 35-50 cm, arranging waterproof plastic cloth on one side surface of the clay layer close to the roadbed, and then filling the rest space of the water collecting channel with soil. The upper end of the water-stop wall is higher than the corresponding side bottom ground of the earth cofferdam by 50cm, the outer side surface of the upper part of the water-stop wall is attached to the corresponding side bottom of the earth cofferdam, and the outer side surface of the water-stop wall is arranged in the interlayer 91 at the bottom of the earth cofferdam for preventing the water seepage at the lower end of the earth cofferdam.
(6) And (3) construction of the fir pile 11 reinforcing area:
marking pile positions along the pit bottom ground along the line outside the widened roadbed according to the design, wherein the adjacent rows of pile positions are arranged in a staggered manner; cutting the thin end of the fir wood pile into a taper shape, and coating fireproof, anticorrosive and mothproof solvent such as asphalt (asphalt) on the peripheral wall of the fir wood pile before the fir wood pile is buried; the fir-tree piles are driven and pressed by an excavator bucket, the deviation of each pile position after being driven and pressed is controlled to be not more than one half of the pile diameter, the deviation of the verticality of the fir-tree piles is allowed to be less than 2%, the upper ends of the pressed fir-tree piles are exposed out of the pit bottom ground by 10cm, and the upper end faces of the fir-tree piles are on the same plane; each pile position of the fir-tree pile reinforcing area is arranged in a quincunx shape, the central line distance of each fir-tree pile in adjacent rows is 0.45m, the lower end of each fir-tree pile is positioned in the underground supporting layer 13, and the width of the fir-tree pile reinforcing area is not less than 1.4m. The longitudinal center line of the fir-tree pile reinforcing area is preferably on the same vertical line with the line along the widened outer side of the roadbed.
The fir stake 11 reinforced area is used for improving the bearing capacity of widening the road bed, and fir stake compares with other stake, and fir stake self structure is more durable and durable, can play the effect of support well when using, and fir stake's anticorrosive ability is stronger, is difficult to take place to rot, compares with other stake, and fir stake's cost is lower for other.
(7) And pouring a concrete expansion foundation 12 at the upper end of the fir pile reinforcing area, wherein the height of the concrete expansion foundation 12 is at least 0.5m, the two side edges of the concrete expansion foundation extend to the position 0.5m outside the corresponding two side edges of the fir pile reinforcing area, and the lower end surface of the concrete expansion foundation is connected with the upper end surface of each fir pile, namely the exposed upper end surface of each fir pile is positioned in the lower end surface of the concrete expansion foundation.
The concrete enlarged foundation 12 is formed by pouring C30 concrete, the concrete enlarged foundation template is a steel template, the surfaces of the templates are leveled, the joint of the templates is tight, slurry does not leak, the quality of the vertical template is required to be qualified before pouring, the stability of the foundation is required to be ensured, the foundation is leveled, the foundation is cleaned up, no sundries influencing the quality of the concrete are contained, the allowable bearing capacity of the foundation is determined, whether the position and the elevation of the foundation pit are consistent with design files or not, the stability and the dryness of the foundation pit are required to be ensured, and the concrete pouring is carried out under the condition that the foundation is not water.
The joint of the upper end surface of the poured concrete expansion foundation and the grout non-retaining wall is roughened so as to enhance the firmness of the upper end surface and the grout non-retaining wall.
(8) After the poured concrete enlarged foundation 12 reaches the designed strength, the slurry sliced stone retaining wall 1 is built at the upper end of the concrete enlarged foundation, the slurry sliced stone retaining wall is built by cement mortar and coarse stone materials, the stones used at all parts of the stone masonry are matched in size, the minimum side length and the middle thickness of the coarse stone materials are not less than 25cm, the stone masonry can adopt irregular-shaped coarse stones, irregular-shaped flat coarse stones with two opposite planes approximately parallel and processed stones, and the strength grade of the stone masonry is not less than 30MPa. Adopt M7.5 cement mortar masonry, M10 mortar pointing, plastering, the mix proportion execution that should strictly provide according to the design during the mix, the manual mixing of banning strictly. Before masonry, impurities such as mud, scale and the like on the surface of the stone should be cleaned, and the stone is cleaned by water for use if necessary. The cross section of the slurry slice stone retaining wall 1 is trapezoidal, and the side surface of the slurry slice stone retaining wall close to the roadbed side is a vertical surface. The width of the bottom surface of the grout and slice stone retaining wall is 1.6-1.8M, the width of the top surface of the grout and slice stone retaining wall is 0.8-1M, the upper end surface of the grout and slice stone retaining wall is flush with the upper end surface of the pavement structure layer 6, a groove 16 connected with the pavement structure layer 6 is reserved in the side wall of the upper end of the grout and slice stone retaining wall, M10 cement mortar is adopted for plastering the upper end surface of the grout and slice stone retaining wall, and the thickness of the grout and plaster is 3cm. The upper end face of the grout section stone retaining wall is longitudinally embedded with the lower ends of guardrail columns 3 at intervals, the upper ends of the guardrail columns 3 are positioned outside the upper end face of the pavement structure layer, and the upper part of the grout section stone retaining wall 1 is longitudinally embedded with a water drain pipe 2 transversely penetrating through the grout section stone retaining wall at intervals. The drain pipe adopts a PVC drain pipe with the diameter of 30cm, and the lower outlet of the drain pipe is higher than the annual water level by at least 50cm so as not to influence the road surface drainage.
(9) Tamping the foundation slope surface on the inner side surfaces of the slurry-sliced stone retaining wall 1 and the concrete enlarged foundation and the original foundation slope surface, so that the tamped foundation slope surface 5 is distributed in a three-stage step shape; the ratio of the size and the width of the three-stage stair-like tamped foundation slope surface from bottom to top is 1:1:1, the height ratio of the step size of the three-step ladder shape from bottom to top is 1.3:1:1, the upper end face of the ladder at the top end and the lower end face of the pavement structure layer are on the same plane. And compacting the slope surface of the foundation by using a compactor, wherein the compaction degree is not less than 94%.
(10) Filling and compacting layer by using permeable fillers 4 in a section between the inner side surfaces of the slurry-cut stone retaining wall and the concrete enlarged foundation and the tamped slope surface of the three-stage stepped foundation, wherein the permeable fillers have the particle size of less than 10cm, the content of broken stones or slag stones with the particle size of 1-4 cm and the soil content of not more than 10 percent is 30-70 percent, the balance is gravels and sands, the water content is 8-10 percent, and the tampers are used for tamping and compacting, and the degree of compaction is not less than 94 percent.
The upper layer surface of the permeable filler and the lower end surface of the pavement structure layer are on the same plane;
(11) And a pavement structure layer is arranged on the upper layer surface of the permeable filler and the upper end surface of the tamped foundation slope, and the extension surface of the pavement structure layer is positioned in the groove 16 reserved on the side wall of the upper end of the slurry sliced stone retaining wall. The inner side of the upper part of the guardrail upright post is provided with a crash-proof plate, the edge part of the pavement structure layer at the upper end of the water drain pipe is internally provided with a water collecting tank with a rain grate, and the lower end of the water collecting tank is communicated with the upper port of the water drain pipe, so that the construction of widening the roadbed is completed.
The pavement structure layer in the above embodiments is processed according to the conventional process, so the description is not repeated.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. A construction method suitable for widening a roadbed in a region adjacent to a pond is characterized by comprising the following steps:
(1) The method comprises the following steps of surveying the natural landform condition of the location of a widened roadbed section of a water area of an adjacent pond on site, recording the hardness of the surrounding ground, the state of each underground layer, the depth of a wet soft zone of a riverbed and the depth of a water layer in detail, making detailed survey records on site, and designing the work of widening the original roadbed according to the detailed survey records on site in detail;
(2) The roadbed widening construction is carried out in dry water or rainy seasons, the foundation pit excavation is carried out until the foundation is finished, the continuous construction is carried out, the position of the original roadbed needing widening is measured and lofted, and the position needing widening is marked;
(3) Extending outward by 5m along the outer side line of a position to be widened of the roadbed, dividing a water area of the pond by an earth cofferdam, forming a roadbed widening construction section at a section between the earth cofferdam and the position line of the original roadbed, and pumping water of the roadbed widening construction section to the pond at the other side of the earth cofferdam or discharging the water to a water storage site preset in advance by using a submersible pump or an open trench; or a water collecting channel with the width of 1-1.2 m and the length of 1m is dug downwards along the ground line of the lower end of the earth cofferdam close to the roadbed to collect water, and the water in the water collecting channel is pumped to the pond on the other side of the earth cofferdam by a submersible pump;
(4) Removing sludge in a widened construction section of a roadbed, measuring the surface elevation of the sludge after drainage before dredging, removing the depth of the sludge to be more than 50cm, airing the sludge with the water content of more than 20% for more than two days, turning over for multiple times, or turning over the sludge in a pond to a construction open space for stacking and airing, and loading and abandoning the sludge in a specified waste soil yard after the sludge is aired until the water content is lower than 10%;
(5) Arranging a water-stop wall, continuously digging a water collecting channel downwards for 1.2m, arranging a clay layer on the side surface of the water collecting channel close to one side of the earth cofferdam, wherein the height of the clay layer is at least 2.2m, the width of the clay layer is 35-50 cm, arranging waterproof plastic cloth on one side surface of the clay layer close to the roadbed, and then filling the rest space of the water collecting channel with soil;
(6) And (3) constructing a fir pile reinforcing area:
(a) Marking pile positions along the pit bottom ground along the line on the widened outer side of the roadbed according to the design, wherein the adjacent rows of pile positions are arranged in a staggered manner;
(b) The end head of the thin end of the fir wood pile is cut into a taper shape, and the peripheral wall of the fir wood pile is coated with fireproof, anticorrosive and mothproof solvent before the fir wood pile is buried;
(c) Driving the fir-wood piles until the upper ends of the fir-wood piles are exposed out of the ground of the pit bottom by 10cm and the upper end surfaces of the fir-wood piles are on the same plane;
(7) Pouring a concrete expansion foundation at the upper end of the fir pile reinforcing area, wherein the height of the concrete expansion foundation is at least 0.5m, two side edges of the concrete expansion foundation extend to 0.5m outside the corresponding two side edges of the fir pile reinforcing area, and the lower end surface of the concrete expansion foundation is connected with the upper end surface of each fir pile;
(8) After the poured concrete expansion foundation reaches the designed strength, a slurry slice stone retaining wall is built at the upper end of the concrete expansion foundation, the cross section of the slurry slice stone retaining wall is trapezoidal, the width of the bottom surface of the slurry slice stone retaining wall is 1.6-1.8 m, the width of the top surface of the slurry slice stone retaining wall is 0.8-1 m, the upper end surface of the slurry slice stone retaining wall is flush with the upper end surface of the pavement structure layer, the lower end of a guardrail upright post is embedded at a longitudinal distance, the upper end of the guardrail upright post is positioned outside the upper end surface of the pavement structure layer, and a water drain pipe transversely penetrating through the slurry slice stone retaining wall is embedded at a longitudinal distance;
(9) Tamping the slope surface of the foundation on the inner side surfaces of the slurry sliced stone retaining wall and the concrete enlarged foundation and the original slope surface of the foundation to ensure that the tamped slope surface of the foundation is distributed in a three-stage step shape;
(10) Filling and compacting layer by using water permeable fillers at a section between the inner side surfaces of the slurry-cut stone retaining wall and the concrete enlarged foundation and the slope surface of the tamped three-stage stepped foundation, wherein the upper layer surface of the water permeable fillers and the lower end surface of the pavement structure layer are on the same plane;
(11) And arranging a pavement structure layer on the upper layer surface of the water-permeable filler and the upper end surface of the tamped foundation slope, wherein the extension surface of the pavement structure layer is positioned in a groove reserved on the side wall of the upper end of the slurry-cut stone retaining wall, the inner side of the upper part of the guardrail upright post is provided with a collision-proof plate, a water collection tank with a rain grate is arranged in the edge part of the pavement structure layer at the upper end of the water drain pipe, and the lower end of the water collection tank is communicated with the upper port of the water drain pipe, so that the construction of widening the roadbed is completed.
2. The method of claim 1, wherein: the upper end of the water-stop wall is 50cm higher than the bottom ground of the corresponding side of the earth cofferdam, the outer side surface of the upper part of the water-stop wall is attached to the bottom of the corresponding side of the earth cofferdam, and the outer side surface of the water-stop wall is arranged in the interlayer at the bottom of the earth cofferdam.
3. The method of claim 1, wherein: the fir-tree pile reinforcing area is characterized in that pile positions of the fir-tree pile reinforcing area are arranged in a quincunx shape, the central line distance of fir-tree piles in adjacent rows is 0.45m, and the lower end of each fir-tree pile is positioned in the underground bearing layer.
4. The method of claim 1, wherein: the concrete enlarged foundation is formed by pouring C30 concrete, and the joint of the upper end surface of the concrete enlarged foundation and the grouted non-blocking wall is roughened.
5. The method of claim 1, wherein: the thick liquid section stone barricade adopt cement mortar and coarse aggregate to build by laying bricks or stones and form, the minimum length of side of coarse aggregate and middle part thickness are not less than 25cm, the thick liquid section stone barricade side that is close to the road bed side is the perpendicular.
6. The method of claim 1, wherein: the foundation slope surface of the tamping is in a three-level ladder shape, and the size width ratio of the ladder from bottom to top is 1:1:1, the height ratio of the three-stage ladder-shaped step size from bottom to top is 1.3:1:1, the upper end face of the ladder at the top end and the lower end face of the pavement structure layer are on the same plane.
7. The method of claim 1, wherein: the grain diameter of the permeable filler is less than 10cm, the content of the broken stone or the slag stone with the grain diameter of 1-4 cm, the soil content of which is not more than 10 percent, is 30-70 percent, the balance is gravelly soil and sand soil, and the water content is 8-10 percent.
8. The method of claim 1, wherein: the drain pipe adopts a PVC drain pipe, and the lower end outlet of the drain pipe is higher than the perennial water level by at least 50cm.
9. The method of claim 1, wherein: the upper end lateral wall of thick liquid section stone barricade reserve the recess that links up with the road surface structural layer, the up end of thick liquid section stone barricade adopts M10 cement mortar to plaster, thick liquid plaster thickness is 3cm.
10. The method of claim 1, wherein: the fir-tree piles are driven and pressed by an excavator bucket, the deviation of each pile position after being driven and pressed is controlled to be not more than one half of the diameter of the fir-tree pile, and the allowable deviation of the verticality of the fir-tree pile is less than 2%.
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