CN117738034A - Offshore road construction method - Google Patents

Abstract

The invention discloses an offshore road construction method, which comprises the following steps of: step one, establishing a wire control network and a height control network according to retest correct wire points and level points, setting out red line range side piles and scattering lime; step two, treating the surface layer of the foundation; judging the foundation type, and carrying out replacement and filling treatment on the foundation according to the foundation type; step four, excavating roadbed earthwork; fifthly, performing filling roadbed construction; step six, carrying out drainage engineering construction; and seventhly, carrying out roadbed renovation and protection. According to the offshore road construction method, the step of treating the pond in the step three can effectively achieve the effects of higher drainage efficiency and more thorough treatment of the pond.

Description

Offshore road construction method

Technical Field

The invention relates to a construction method, in particular to an offshore road construction method.

Background

The roadbed construction is a very important construction flow in the road construction, and in the process of the offshore road construction, as the offshore road is close to a water source, a pond is frequently encountered in the construction process, and drainage construction is needed for the pond, for example, the method disclosed by the patent number 201610677831.1 and named as a soft soil roadbed construction method is to clear impurities on the original surface firstly, excavate a drainage groove on the outer side of the original roadbed, and drain the pond by the drainage groove, however, the drainage efficiency is low in the method, the problem of unclean drainage exists, and the construction process is greatly slowed down.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide an offshore road construction method with high drainage efficiency and clean emission.

In order to achieve the above purpose, the present invention provides the following technical solutions: the offshore road construction method comprises the steps of roadbed construction, and is characterized in that: the roadbed construction steps specifically comprise the following steps:

step one, establishing a wire control network and a height control network according to retest correct wire points and level points, setting out red line range side piles and scattering lime;

step two, treating the surface layer of the foundation, wherein when the surface water is cleaned up by a pond, draining surface water firstly, pumping water by a 4 inch or 6 inch water pump in a precipitation mode, if the water surface area is large, performing isolated pumping by a clay cofferdam mode, setting the upper bottom width of the clay cofferdam to be not less than 2.5m, discharging a slope according to a ratio of 1:1, and then removing silt soil, humus soil and cultivated soil in a range, particularly, performing excavation by an excavator from top to bottom, wherein the depth range of removing the surface treatment miscellaneous fill and cultivated soil is 0.5m, and the depth range of removing the foundation treatment miscellaneous fill and cultivated soil is 0.8m;

judging the foundation type, and carrying out replacement and filling treatment on the foundation according to the foundation type;

step four, excavating roadbed earthwork;

fifthly, performing filling roadbed construction;

step six, carrying out drainage engineering construction;

and seventhly, carrying out roadbed renovation and protection.

As a further improvement of the present invention, the step three is to judge the foundation type, and the concrete steps of the foundation replacement treatment according to the foundation type are as follows:

step three, judging whether the foundation is located in the middle sand or the weathered sandstone;

step three, if the base is judged to be located in the middle sand, the middle sand is subjected to replacement or compaction treatment and can be used as a roadbed foundation bearing layer after rechecking inspection, and if the base is judged to be located in the weathered sandstone, the weathered sandstone is directly used as the roadbed foundation bearing layer;

wherein, drain first to pond, pond and ditch in the road bed influence scope, establish the desilting behind the grass bag cofferdam, the desilting standard is: for a pool section, a woven bag cofferdam is arranged before roadbed filling to pump water in the pool to dry, the sludge at the bottom of the pool is removed, dredging is carried out to undisturbed soil, if the groundwater level is higher, after the sludge is removed, the bearing capacity of a foundation still cannot meet the requirement, 60cm rubble is paved at the bottom of the pool, a layer of natural gravel with the thickness of 20cm is paved on the rubble, then the rubble is laminated and backfilled to a uniform elevation according to the standard requirement, then the rubble is filled to a designed roadbed, meanwhile, the roadbed side slope adopts 30cm thick M7.5 slurry to block rubble for full slope protection below the water level of the pool, and the slope of the embankment in the pool is 1:1.5.

as a further improvement of the present invention, the concrete steps of the filling subgrade construction in the fifth step are as follows:

step five, performing substrate treatment;

step five, transporting the filling soil through an automobile;

fifthly, rough leveling and initial pressing are carried out through a bulldozer;

leveling by a land leveler, and then directly conveying the water to a filling layer by adopting a water supply pipe along the line, or adopting a sprinkler to obtain water from a designated water taking point of an owner, conveying the water to a site filling layer, and sprinkling water to earthwork with insufficient water content;

fifthly, carrying out re-compaction and final compaction, then carrying out compaction degree detection, carrying out sedimentation observation after the detection is qualified, and reinforcing and rolling by using a large-tonnage road roller after the sedimentation observation is qualified.

As a further improvement of the present invention, the specific steps of the substrate treatment in the fifth step are as follows: step 1, paving filled roadbed layer by layer, wherein the filling thickness of each layer is not more than 30cm, and rolling and compacting layer by layer; step 2, performing roadbed filling and junction treatment, filling an excavation area in the half-filled half-excavated roadbed with a material with good water permeability, performing overexcavation backfill rolling on soil mass within a range of 1m of a roadbed of the excavation area, paving a geofence within a range of the roadbed at the filling and junction, and paving 3m wide areas in the filling area and the excavation area respectively;

step 3, longitudinally filling and digging a junction roadbed, and along the bottom of a road groove, feeding an upper road bed in a range of 10m along the cutting direction, and carrying out super-digging, backfilling and compacting by using mountain-climbing slag together with a range of 15m along the embankment direction, wherein the super-digging depth is gradually changed from 1.5m to 0.5m, and brushing a slope according to geological conditions when the longitudinal slope of the ground at the longitudinally filling and digging junction is steeper, wherein the slope rate is 1:1.5, transversely excavating steps, wherein the width of each step is 2.0m, and respectively paving geogrids at the bottom and the top of the road groove.

As a further improvement of the present invention, the specific way of performing the re-pressing in the fifth step is as follows: vibrating and rolling for 3-4 times by adopting a 26t vibrating road roller, wherein the overlapping width of the wheel tracks is not less than 1/3 during rolling, vibrating and pressing is carried out by using a high-frequency low-vibration method firstly slowly and then quickly during rolling, the wheel tracks are distributed with one working surface for one time, and the rolling running speed of the road roller is not more than 4km/h; when rolling, the straight line segment is from two sides to the middle, the small radius curve segment is from the inner side to the outer side, and the two sections longitudinally overlap by more than 2 m.

As a further improvement of the present invention, the specific way of performing the final pressing in the fifth step is as follows: and adopting a static pressure of a 26t vibratory roller for 1-2 times, detecting the compactness of the roadbed by adopting a sand filling method after the static pressure is finished, and if the compactness requirement of a design drawing is not met, adopting a single variable method to increase the number of double pressing times and the number of final pressing times until the compactness requirement of the design requirement is met, wherein the number of rolling pressing times and the combination mode at the moment are the final determined compaction times.

As a further improvement of the present invention, the specific way of performing the compactness detection in the fifth step is as follows: the compactness of the roadbed is detected by adopting an on-site sand filling method, the water content of sand and clay is rapidly determined by alcohol combustion, and the compactness of clay filling is detected by adopting a ring cutter method.

As a further improvement of the invention, the settlement observation in the fifth step adopts a settlement plate method to observe the settlement of the sand filling roadbed construction period of a typical section, wherein the settlement plate consists of a bottom steel plate and a metal measuring rod, the bottom steel plate is 400mm multiplied by 5mm, and the measuring rod adopts a steel pipe with the diameter of 60 mm. As a further improvement of the present invention, the specific steps for the road bed renovation in the step seven are as follows:

seventhly, recovering each stake, and checking the position of the central line, the width, the longitudinal slope, the transverse slope, the side slope and the corresponding elevation of the roadbed according to the requirements of the design drawing;

step seven, a soil roadbed is renovated and formed by a manual or mechanical soil scraping or soil supplementing method, and a deep cutting slope is renovated to brush the slope from top to bottom according to the gradient required by design;

seventhly, adopting a land leveler or a bulldozer to level the surface of the soil roadbed, and adopting the same soil as the surface of the roadbed to fill up and tamp when the shoveled soil is insufficient to fill up the pits; the stone subgrade surface is tightly and flatly caulking with stone scraps;

removing stone blocks with the thickness of less than 150mm and the loose or semi-buried size of more than 100mm from the surface layer of the roadbed, and filling and compacting;

seventhly, detecting and then trimming longitudinal slopes of various ditches by using an instrument;

seventhly, cutting off the superfilling width at two sides of the filling road base, digging steps if the slope lacks soil, filling and tamping in layers to finish the refurbishment, and simultaneously removing the waste soil piled in the roadbed range.

The invention has the beneficial effects that the roadbed construction of an offshore road can be effectively realized through the arrangement of the first step to the seventh step, and compared with the prior art, the water drainage efficiency is higher by adopting a water pump to pump water in the process of cleaning the pool, and the water drainage efficiency is cleaner than that of only adopting a drainage tank in the prior art, meanwhile, compared with the prior art, the sludge is treated after the water is pumped out, so that the feel of treating the pool is better, and meanwhile, the water is pumped in a clay cofferdam mode under the condition of large water surface area, so that the water is concentrated, the drainage efficiency is further increased, and the problem that the construction is influenced by the water flowing everywhere can be prevented.

Detailed Description

The invention will be further described in detail with reference to the examples given below.

The offshore road construction method of the embodiment comprises a roadbed construction step, wherein the roadbed construction step specifically comprises the following steps:

step one, establishing a wire control network and a height control network according to retest correct wire points and level points, setting out red line range side piles and scattering lime;

step two, treating the surface layer of the foundation, specifically:

before roadbed excavation construction, determining an on-site working boundary line, and protecting plants and structures appointed to remain; manually felling or transplanting trees and shrubs in the roadbed land range and the soil-taking field range, properly treating, filling pits in the roadbed land range, and tamping; the garbage, organic matter residue and turf, crop root system and surface soil in the area of roadbed and at least 10-30 cm below the original ground are eliminated and deposited in waste soil field.

The principle of water section cleaning of ponds and the like is as follows: the surface water is drained firstly, a 4 inch or 6 inch water pump is adopted for pumping water in a dewatering mode, if the area of a water area is large, a clay cofferdam mode is adopted for isolating and pumping water, the upper bottom width of the clay cofferdam is not less than 2.5m, a slope is laid according to a ratio of 1:1, then silt soil, humus soil, cultivated soil and the like in a range are removed, and the principle of cleaning the surface of the water-free section is that turf, cultivated soil, humus soil and the like are removed. And excavating the water pond or the original anhydrous section from top to bottom by adopting an excavator.

The depth range of the earth surface treatment miscellaneous fill and the tillage planting soil is generally 0.5m, the depth range of the earth surface treatment miscellaneous fill and the tillage planting soil is generally 0.8m, and the depth ranges of the other miscellaneous fill and the tillage planting soil are specifically based on actual occurrence.

And the site engineer notifies the supervision engineer of the start of the meter clearing construction, and communicates with the supervision engineer in time after the meter clearing is finished, so that the meter clearing engineering quantity signing is completed. For road sections with larger difference between the clearing thickness and the design requirement thickness, the supervision engineering should be informed in time, and the engineering quantity increased due to inconsistent design is required to be checked on site.

For parts that cannot be cleaned by the machine in the process of cleaning the surface, for example: the tree root and the like should be cleaned by manual work. After the cleaning is finished, the generated pits are filled up and compacted, and the pits are rolled to a specified compaction degree.

Cutting or transplanting trees, shrubs, weeds and the like in the roadbed range, intensively stacking the cleaned soil surface soil and humus soil containing plant root systems, and then uniformly transporting to a spoil field, wherein the soil surface soil and humus soil are forbidden to be buried in the roadbed filling range so as to enable the roadbed to sink.

And (3) carrying out surface soil outside, strictly selecting and designating a spoil field according to the requirements of owners, and not digging and discarding in disorder, so as to strictly forbid the invasion of paddy fields. Before spoil, a retaining, protecting and draining system is firstly arranged, so that the spoil and spoil are prevented from diffusing and losing, and the surrounding environment and the landscape are not affected. The top surface is smooth in time after the slag disposal is finished, and the side slope is brushed smoothly.

Judging the foundation type, and performing replacement and filling treatment on the foundation according to the foundation type, wherein the replacement and filling treatment comprises the following concrete steps:

according to the geological survey report, the road subgrade is drawn to be a common subgrade, and the earth filling element earth filling is properly replaced and filled.

1. When the foundation is located in the middle sand, the pores of the middle sand are larger, loose and slightly dense, the engineering properties are general, and the foundation can be used as a foundation bearing layer of the foundation after the middle sand is subjected to replacement or compaction treatment and rechecking inspection.

2. When the foundation is seated on weathered sandstone, the engineering property is better, and it is recommended to directly use the weathered sandstone as the foundation bearing layer of the roadbed.

3. And (3) a replacement filling method: shallow soft soil or poor soil is dug out, and the mountain skin stone is backfilled in layers for rolling or tamping to change the filled soil, so that the settlement value of the roadbed meets the design requirement, the construction is simple, and the control is convenient.

4. The fishpond, the pond and the ditch in the roadbed influence range are firstly drained, and when necessary, a grass bag cofferdam is arranged, and then dredging is carried out, wherein the dredging standard is as follows: for a pond section, a woven bag cofferdam is arranged before roadbed filling to pump water in the pond out, sludge at the bottom of the pond is removed, dredging is carried out to original soil, if the current ground water level is higher, the bearing capacity of a foundation still cannot meet the requirement after the current sludge is removed, 60cm pieces of stones are paved at the bottom of the pond, a layer of natural gravel with the thickness of 20cm is paved on the stones, and then the stones are laminated and backfilled to a uniform elevation according to the standard requirement, and then the stones are filled to a designed roadbed. The subgrade slope adopts 30cm thick M7.5 slurry to block the piece stone slurry below the pool water level +0.5m for full slope protection. The embankment slope in the pond is 1:1.5.

step four, excavating roadbed earthwork, which is specifically as follows:

1. digging and loading by adopting an excavator for earth excavation, and transporting by using a dump truck; during excavation, the construction of blasting or digging holes and taking soil is strictly forbidden, the excavation is performed from top to bottom according to longitudinal layering and transverse full width, and random excavation or super-excavation cannot be performed. And when the soil and stone boundary is excavated and scattered stones appear, measuring the quantity of the soil and stone boundary and the stone, and continuing to construct after approval by a supervision engineer.

2. When the soil layer property changes in the excavation process, timely reporting and supervising engineers approve modification of the construction scheme and the side slope form; and (3) protecting pipelines and the like which are not shown in drawings in construction, and submitting to a supervision engineer for field treatment.

3. When excavating to the vicinity of a residential area or a dangerous area, arranging special persons to carry out safety supervision and traffic guiding on key positions; in the construction process, enough safety protection measures are considered, such as arranging necessary temporary ballast blocking walls on the outer side of the road along the line, preventing stones from rolling off, reducing hidden danger and interference, arranging full-time safety officers for inspection, arranging safety warning signs and safety banners at striking places, and the like. The effective measures are taken to protect the safety of houses, residents and constructors, and provide convenience for the life and traffic of the residents.

4. Brushing the slope by a manual cooperation machine (backhoe) when the upper line 20-30 cm close to the slope is excavated, and protecting the trimmed slope in time according to the design requirement; the subgrade substrate is soil, when the subgrade substrate is excavated to 20-30 cm away from the designed elevation, the soil is lifted by the bulldozer to the designed elevation, the grader is leveled, and meanwhile, the side ditches on two sides are excavated and masonry work is completed. When the distance below the top surface of the roadbed is 30cm and the soil replacement is more than 30cm, the compactness is required to reach the compactness specified by the design.

5. The engineering cutting slope adopts 1:1.

Fifthly, performing filling roadbed construction, which specifically comprises the following steps:

1. substrate treatment

After site dewatering, surface cleaning and foundation treatment, rolling before filling is needed.

(1) Road section of filling: the filled roadbed should be paved layer by layer, the filling thickness of each layer must not exceed 30cm, the compaction is carried out layer by layer, the compaction degree of the pipeline groove backfill soil in the roadbed range is not lower than the filling requirement of the common section of the roadbed, if the section with poor soil texture is found, the treatment is carried out in time, and the layered backfill construction can be carried out after the qualification is confirmed on site by a supervision unit.

The ground transverse slope is less than 1: and 5, after removing the surface turf and humus, directly filling embankments on the natural ground.

The surface soil of the dry farmland needs to be removed for 20cm, the dry farmland is filled after being rolled up to be qualified, and the rolling thickness of the dry farmland is calculated according to 10 cm. The ground transverse slope is 1:5 to 1:2.5, the original ground should dig steps, the step width is not less than 2m, when the overburden on the bedrock surface is thinner, the overburden should be cleared first and then dig the steps, when the overburden is thicker and stable, can remain. The surface layer of the foundation should be compacted. In a typical soil texture section, the degree of compaction (heavy duty) of the substrate should not be less than 90%. When the height of the roadbed filling soil is smaller than the total thickness of the pavement and the roadbed, the surface soil of the foundation should be overdrawn and backfilled and compacted in layers, and the treatment depth should not be smaller than 0.8 meter.

The rebound modulus of the soil base on the top surface of the treated roadbed is more than 30MPa.

Roadbed compactness requirement

(2) Roadbed filling and digging juncture treatment

The method is characterized in that a excavation area in the half-filled half-excavated roadbed of the engineering is filled with a material with good water permeability, soil mass within a range of 1m of a roadbed of the excavation area is simultaneously subjected to overexcavation backfill rolling, compaction standards meet roadbed compactness standards of corresponding positions, geotechnical barrier is paved within a range of the roadbed at a filling junction, and the filling area and the excavation area are respectively paved with 3m width.

(3) Longitudinal filling and digging boundary roadbed

When the junction is longitudinally filled, the road bed is overtrained along the bottom of the road groove within 10m of the cutting direction and is in the direction of the embankment

The 15m range is backfilled and compacted by using mountain-climbing slag. The overbreak depth is gradually changed from 1.5m to 0.5m. When the ground longitudinal slope at the longitudinal filling and digging juncture is steeper, the slope is firstly brushed according to the geological condition, and the slope rate is 1:1.5, then transversely excavating steps, wherein the width of each step is 2.0m. And respectively paving geogrids at the bottom and the top of the road groove.

2. Automobile transportation filling soil

Qualified filling is carried out by a planned soil-taking field, the filling is carried out by an excavator, a dump truck is carried to the embankment to be filled, and the filling is carried out strictly according to the square grid drawn by measurement. The special person directs the material transporting vehicle to the specified square position for unloading soil, and the unloading distance is strictly mastered, so that insufficient or excessive material quantity is avoided. Before the transport vehicle is transported to the unloading place, the transport vehicle is turned around in advance, and is reversed to the unloading place, so that the turning around in the place is forbidden, the qualified roadbed is prevented from being damaged, particularly, the roadbed formed by rolling is damaged due to the fact that the internal friction angle of sand is smaller, deeper ruts are rolled, and the roadbed filling quality cannot be guaranteed.

3. Rough and flat, initial press of bulldozer

The filling side slope adopts 1 according to the requirement of the designed filling section roadbed slope: 1.5.

when the first layer of earth is filled, the construction transverse gradient is controlled to be about 3%, the construction transverse gradient is set to be an inward-inclined transverse gradient, transverse water flow is directed to the center of a road, the sand filling loose paving thickness is checked before initial compaction, the initial compaction is carried out by adopting a bulldozer for static pressure for 2 times, the compaction is carried out wheel by wheel according to a compaction process of common earthwork from the edge of a roadbed to the inner side, the overlapping width of wheel tracks is not less than 1/2 wheel width during the compaction, the wheel tracks are distributed with one working surface for 1 time, the compaction is carried out for 2 times, and a crisscross compaction mode can be adopted during the compaction.

4. Leveling machine leveling

After the initial pressing process, the paving surface is leveled by a grader, so that the paving surface is transversely and smoothly uniform, 1-3% of bidirectional inward transverse slope is made, the uniform and consistent flatness is maintained, and the local pits are manually trimmed.

5. Water sprinkling

The water is directly conveyed to the filling layer by adopting a water supply pipe along the test section, or is taken from the designated water taking point of the owner by adopting a sprinkler, and is conveyed to the site filling layer, and the water is sprinkled to the earthwork with insufficient water content to meet the requirement.

6. Re-pressing and final pressing

(1) The back pressure adopts a 26t vibratory roller to perform vibratory rolling for 3-4 times, the overlapping width of the wheel tracks is not less than 1/3 during rolling, the vibration pressure is performed by a high-frequency low-vibration method after the rolling is performed slowly, and the wheel tracks are distributed on one working surface for one time. The rolling running speed of the road roller is not more than 4km/h; when rolling, the straight line segment is moved from two sides to the middle, and the small radius curve segment is moved from the inner side to the outer side, and is moved longitudinally. The front and rear adjacent sections (the leveling pre-pressing section before the rolling section and the subsequent checking section) are longitudinally overlapped by more than 2m, so that no pressure leakage and dead angle are achieved, and rolling uniformity is ensured.

(2) And the final compaction is carried out by adopting a 26t vibratory roller static pressure for 1-2 times, and then the compaction degree of the roadbed is detected by adopting a sand filling method, if the compaction degree requirement of a design drawing is not met, the number of double compaction passes and the final compaction passes are increased by adopting a single variable method until the compaction degree requirement of the design requirement is met, and the number of rolling passes and the combination mode at the moment are finally determined to be the compaction pass.

(3) Section control: the filling section side slope line is controlled according to the superfilling width of 50cm at each side, the spacing of the straight line section side piles is 20m, and the spacing of the curve section side piles is 10m in order to ensure the geometric dimension of the section to be accurate. Standard geometric sections are made by using a standard rod and a red construction rope every 20-50 m.

7. Compaction degree detection

(1) The method for detecting the compactness of the roadbed adopts an on-site sand filling method, the water content of sand and clay is rapidly measured by alcohol combustion, the detection result is timely obtained to guide construction, and the compactness of clay filling can also be detected by a ring cutter method.

(2) And (3) taking a test section to perform a rolling test before roadbed construction so as to recheck and determine final construction parameters.

(3) The test is carried out strictly according to the test steps and methods, and the instrument is checked and corrected periodically in the use process, so that systematic errors are avoided.

(4) The compactness should reach the standard specified by the specification, if the compactness does not meet the requirement, the compaction should be carried out until the compactness is qualified, and the detection sampling position and depth should meet the specification of the relevant clause of the specification.

(5) Compaction test should be sampled in the compacted layer.

(6) Random sampling is adopted, 3 points are inspected every 1000 square meters, and the inspection points can be increased as required.

8. Sedimentation observation

And setting monitoring points on site after the roadbed is filled to the designed elevation, and monitoring once a day until the roadbed is subjected to intermediate intersection acceptance and next working procedure construction. The observation method is as follows:

(1) And observing settlement of the sand filling roadbed in the construction period of the typical section by adopting a settlement plate method.

(2) The sedimentation plate consists of a bottom steel plate and a metal measuring rod, wherein the bottom steel plate is 400mm multiplied by 5mm, and the measuring rod adopts a steel pipe with the diameter of 60 mm.

(3) The sedimentation plate is buried on the original ground.

(4) The observation pile is firmly buried, and a protection mark is arranged on the exposed part of the observation pile so as to prevent the construction machine from damaging the observation pile. And (5) making measuring point marks on the tops of all the observation piles by using red paint, and measuring the initial pile top elevation. The observation requirements are as follows:

(1) a settlement observation section is arranged every 200m of a general roadbed, and each section is provided with a point at the left, middle and right. The soft foundation section should be additionally provided with lateral displacement observation points at the toe.

(2) And a DZS3 level is adopted for observation, the level error is less than 1mm, and the closing difference meets the three-class measurement requirements.

(3) In the continuous construction process, the observation frequency is normally once per day, and if the deformation rate has an increasing trend, the observation frequency is properly increased; the observation frequency of the road section which cannot be continuously constructed can be properly widened.

(4) The construction unit shall be established with a special person group, the observation personnel and the observation time are fixed, each observation is recorded according to a specified format, and the supervision engineer and the construction unit represent the signing. And drawing a sedimentation curve graph of each stage according to the summary result of the observation data in time, and carrying out regression analysis according to the observation result to obtain the maximum possible sedimentation value.

(5) And (3) carrying out settlement tracking observation according to requirements after the sand filling roadbed is finished, setting a monitoring point every 200m, and observing the settlement condition once every day until the construction of intermediate intersection acceptance and next working procedure.

(6) The design file and the project required to be observed by the standard are tracked and monitored according to the requirement.

9. Reinforcing roller compaction

And after the settlement observation is qualified, reinforcing and rolling by using a large-tonnage road roller (YZ 26 or above) to perform the next working procedure construction.

Step six, carrying out drainage engineering construction, which specifically comprises the following steps:

the roadbed drainage adopts a mode that an underground rainwater pipe is combined with a side ditch, the side ditch is required to be arranged when the height of a dug side slope is more than 3m, a water interception ditch is arranged at a position above 5m of a high cut side slope pitch slope top line, and a 1m wide breaking table and the side ditch are arranged at the slope toe. The filling side slope can be provided with a drainage open ditch according to the requirement, the side ditch material adopts serositic rubble, the longitudinal slope is generally consistent with the crosswalk, the drainage open ditch is consistent with the natural topography, and the lowest point is connected with a road passing box culvert, the drainage open ditch and a river or a rainwater inspection well.

1. Slope drainage

And the slope drainage and the surface water in the road boundary are properly discharged in the roadbed construction, and the slope drainage comprises construction such as side ditches, intercepting ditches, structures and related operations. The slope drainage construction complies with the requirements of the drawing and the related specification: the ditch bottom is smooth, the drainage is smooth, and the phenomenon of water resistance is avoided.

2. Side ditch construction

The method comprises the steps that a side ditch is arranged on a dug area and a filled area according to the design drawing requirements in combination with the actual site topography, and when dry masonry rubbles are used for paving the side ditch, rubbles with flat surfaces are selected, and gaps are tightly embedded by small rubbles; when the mortar rubble is used for paving, the mortar for the joints should be full, and the ditch body is watertight; the ditch bottom surface is smooth.

3. Construction of intercepting ditches

A water interception ditch is arranged at a position above 5m of a high cut slope pitch slope top line; soil dug by the intercepting ditches is piled up between cutting and the intercepting ditches to form soil tables and tamped, and the table tops form 2% of transverse slopes which tend to the intercepting ditches; when a waste soil pile is arranged above the roadbed, the intercepting ditch should leave 1-5 m of the slope toe of the waste soil pile, the slope toe of the waste soil pile leaves the roadbed excavation slope top to be not less than 10m, and the top of the waste soil pile is provided with a transverse slope which is 2% inclined to the intercepting ditch. The water intercepting ditch is provided with a water outlet at a proper position, so that water is guided into the natural ditch, and the water outlet of the water intercepting ditch is smoothly connected with other drainage facilities.

Step seven, carrying out roadbed renovation and protection, which comprises the following steps:

1. roadbed renovation construction content

The refurbishment of the roadbed is performed after all the drainage structures have been completed and backfilled after the roadbed engineering is completed. The road bed renovation content comprises the steps of carrying out the renovation of embankments and cutting slopes according to the standard rules so as to meet the line shape, longitudinal slope, over slope, side ditch and relevant operation of road bed sections of design requirements.

2. Roadbed renovation construction

(1) And recovering each pile, and checking the position, width, longitudinal slope, transverse slope, side slope, corresponding elevation and the like of the central line of the roadbed according to the requirements of the design drawing.

(2) The soil roadbed is shaped by adopting a method of manually or mechanically scraping or supplementing soil; the deep cutting slope is trimmed according to the gradient of the design requirement, and the slope is brushed from top to bottom, so that soil is not required to be attached to the slope.

(3) After the surface of the soil subgrade reaches the designed elevation, a grader or a bulldozer is adopted to scrape the soil, and when the shoveled soil is insufficient to fill the pits, the soil which is the same as the surface of the subgrade is adopted to fill and tamp the soil; the stone subgrade surface is tightly and flatly embedded with stone scraps, and pits and loose stones are not needed.

(4) The refurbished subgrade surface layer is within 150mm thick, loose or semi-buried stones greater than 100mm in size should be removed from the subgrade surface layer and compacted by filling up as specified.

(5) And (3) trimming the side ditch on a hanging line, and detecting longitudinal slopes of various ditches by using an instrument, so as to trim the side ditch to meet the requirements of drawings and specifications.

(6) The superfilling width at two sides of the filling road base is cut off, if the slope lacks soil, steps are dug, and the filling is performed in layers.

(7) After the roadbed is finished, the waste soil materials piled in the roadbed range are removed.

(8) The actual measurement indexes of the road bed after the repair meet the design and specification requirements.

In summary, in the offshore road construction method of the embodiment, the water pump is adopted to pump water and the clay cofferdam is adopted to clean the construction pond, so that the drainage efficiency is high, and the cleaning is cleaner.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims (9)

1. The offshore road construction method comprises the steps of roadbed construction, and is characterized in that: the roadbed construction steps specifically comprise the following steps:

step one, establishing a wire control network and a height control network according to retest correct wire points and level points, setting out red line range side piles and scattering lime;

step two, treating the surface layer of the foundation, wherein when the surface water is cleaned up by a pond, draining surface water firstly, pumping water by a 4 inch or 6 inch water pump in a precipitation mode, if the water surface area is large, performing isolated pumping by a clay cofferdam mode, setting the upper bottom width of the clay cofferdam to be not less than 2.5m, discharging a slope according to a ratio of 1:1, and then removing silt soil, humus soil and cultivated soil in a range, particularly, performing excavation by an excavator from top to bottom, wherein the depth range of removing the surface treatment miscellaneous fill and cultivated soil is 0.5m, and the depth range of removing the foundation treatment miscellaneous fill and cultivated soil is 0.8m;

judging the foundation type, and carrying out replacement and filling treatment on the foundation according to the foundation type;

step four, excavating roadbed earthwork;

fifthly, performing filling roadbed construction;

step six, carrying out drainage engineering construction;

and seventhly, carrying out roadbed renovation and protection.

2. The offshore road construction method of claim 1, wherein: in the third step, the foundation type is judged, and the concrete steps of replacing and filling the foundation according to the foundation type are as follows:

step three, judging whether the foundation is located in the middle sand or the weathered sandstone;

step three, if the base is judged to be located in the middle sand, the middle sand is subjected to replacement or compaction treatment and can be used as a roadbed foundation bearing layer after rechecking inspection, and if the base is judged to be located in the weathered sandstone, the weathered sandstone is directly used as the roadbed foundation bearing layer;

wherein, drain first to pond, pond and ditch in the road bed influence scope, establish the desilting behind the grass bag cofferdam, the desilting standard is: for a pool section, a woven bag cofferdam is arranged before roadbed filling to pump water in the pool to dry, the sludge at the bottom of the pool is removed, dredging is carried out to undisturbed soil, if the groundwater level is higher, after the sludge is removed, the bearing capacity of a foundation still cannot meet the requirement, 60cm rubble is paved at the bottom of the pool, a layer of natural gravel with the thickness of 20cm is paved on the rubble, then the rubble is laminated and backfilled to a uniform elevation according to the standard requirement, then the rubble is filled to a designed roadbed, meanwhile, the roadbed side slope adopts 30cm thick M7.5 slurry to block rubble for full slope protection below the water level of the pool, and the slope of the embankment in the pool is 1:1.5.

3. the offshore road construction method of claim 2, wherein: the concrete steps of the filling roadbed construction in the fifth step are as follows:

step five, performing substrate treatment;

step five, transporting the filling soil through an automobile;

fifthly, rough leveling and initial pressing are carried out through a bulldozer;

leveling by a land leveler, and then directly conveying the water to a filling layer by adopting a water supply pipe along the line, or adopting a sprinkler to obtain water from a designated water taking point of an owner, conveying the water to a site filling layer, and sprinkling water to earthwork with insufficient water content;

fifthly, carrying out re-compaction and final compaction, then carrying out compaction degree detection, carrying out sedimentation observation after the detection is qualified, and reinforcing and rolling by using a large-tonnage road roller after the sedimentation observation is qualified.

4. An offshore road construction method according to claim 3, wherein: the specific steps of the substrate treatment in the fifth step are as follows:

step 1, paving filled roadbed layer by layer, wherein the filling thickness of each layer is not more than 30cm, and rolling and compacting layer by layer;

step 2, performing roadbed filling and junction treatment, filling an excavation area in the half-filled half-excavated roadbed with a material with good water permeability, performing overexcavation backfill rolling on soil mass within a range of 1m of a roadbed of the excavation area, paving a geofence within a range of the roadbed at the filling and junction, and paving 3m wide areas in the filling area and the excavation area respectively;

step 3, longitudinally filling and digging a junction roadbed, and along the bottom of a road groove, feeding an upper road bed in a range of 10m along the cutting direction, and carrying out super-digging, backfilling and compacting by using mountain-climbing slag together with a range of 15m along the embankment direction, wherein the super-digging depth is gradually changed from 1.5m to 0.5m, and brushing a slope according to geological conditions when the longitudinal slope of the ground at the longitudinally filling and digging junction is steeper, wherein the slope rate is 1:1.5, transversely excavating steps, wherein the width of each step is 2.0m, and respectively paving geogrids at the bottom and the top of the road groove.

5. The offshore road construction method of claim 4, wherein: the specific mode of performing the double pressing in the fifth step is as follows: vibrating and rolling for 3-4 times by adopting a 26t vibrating road roller, wherein the overlapping width of the wheel tracks is not less than 1/3 during rolling, vibrating and pressing is carried out by using a high-frequency low-vibration method firstly slowly and then quickly during rolling, the wheel tracks are distributed with one working surface for one time, and the rolling running speed of the road roller is not more than 4km/h; when rolling, the straight line segment is from two sides to the middle, the small radius curve segment is from the inner side to the outer side, and the two sections longitudinally overlap by more than 2 m.

6. The offshore road construction method of claim 5, wherein: the specific mode of final pressing in the fifth step is as follows: and adopting a static pressure of a 26t vibratory roller for 1-2 times, detecting the compactness of the roadbed by adopting a sand filling method after the static pressure is finished, and if the compactness requirement of a design drawing is not met, adopting a single variable method to increase the number of double pressing times and the number of final pressing times until the compactness requirement of the design requirement is met, wherein the number of rolling pressing times and the combination mode at the moment are the final determined compaction times.

7. The offshore road construction method of claim 6, wherein: the specific mode for detecting the compactness in the fifth step is as follows: the compactness of the roadbed is detected by adopting an on-site sand filling method, the water content of sand and clay is rapidly determined by alcohol combustion, and the compactness of clay filling is detected by adopting a ring cutter method.

8. The offshore road construction method of claim 7, wherein: and in the fifth step, the settlement observation adopts a settlement plate method to observe the settlement of the sand filling roadbed construction period of a typical section, wherein the settlement plate consists of a bottom steel plate and a metal measuring rod, the bottom steel plate is 400mm multiplied by 5mm, and the measuring rod adopts a steel pipe with the diameter of 60 mm.

9. The offshore road construction method of claim 8, wherein: the specific steps for repairing the roadbed in the step seven are as follows:

seventhly, recovering each stake, and checking the position of the central line, the width, the longitudinal slope, the transverse slope, the side slope and the corresponding elevation of the roadbed according to the requirements of the design drawing;

step seven, a soil roadbed is renovated and formed by a manual or mechanical soil scraping or soil supplementing method, and a deep cutting slope is renovated to brush the slope from top to bottom according to the gradient required by design;

seventhly, adopting a land leveler or a bulldozer to level the surface of the soil roadbed, and adopting the same soil as the surface of the roadbed to fill up and tamp when the shoveled soil is insufficient to fill up the pits; the stone subgrade surface is tightly and flatly caulking with stone scraps;

removing stone blocks with the thickness of less than 150mm and the loose or semi-buried size of more than 100mm from the surface layer of the roadbed, and filling and compacting;

seventhly, detecting and then trimming longitudinal slopes of various ditches by using an instrument;

seventhly, cutting off the superfilling width at two sides of the filling road base, digging steps if the slope lacks soil, filling and tamping in layers to finish the refurbishment, and simultaneously removing the waste soil piled in the roadbed range.