CN112538798A

CN112538798A - Highway low-humidity paddy field soft base region roadbed direct filling construction process

Info

Publication number: CN112538798A
Application number: CN201910909585.1A
Authority: CN
Inventors: 李玉春; 祖显威; 朱克南
Original assignee: Heilongjiang Nongken Highway Bridge Project Co ltd
Current assignee: Heilongjiang Nongken Highway Bridge Project Co ltd
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2021-03-23

Abstract

The invention relates to a highway low-humidity paddy field soft foundation area roadbed direct filling construction process, which comprises the following working procedures: construction preparation (1) → measuring and paying-off (2) → digging and draining ditch (3) → filling and paving weathered macadam (4) → impact rolling (5) → leveling (6) → first-layer geogrid (7) → roadbed filling (8) → second-layer geogrid (9) → roadbed filling (10) → roadbed sealing (11). The method is characterized in that: and in the procedure of filling and paving weathered gravels (4), the gravels are impacted, rolled and embedded into the substrate and the side wall is hammered and embedded into the soil layer on the side wall of the roadbed. The construction process is simple, the construction progress is fast, the construction process is green and environment-friendly, meanwhile, the sedimentation amount is small, the stability is strong, the economic performance is good, and the application range is wide.

Description

Highway low-humidity paddy field soft base region roadbed direct filling construction process

The technical field is as follows:

the invention relates to a construction process method for constructing a roadbed in a low-humidity region of an expressway, in particular to a roadbed direct filling construction process in a low-humidity paddy field soft foundation region of the expressway.

Background art:

the traditional treatment method of the paddy field soft base area is to adopt traditional processes of mixing ash, stirring, airing, digging, replacing and filling, composite foundation and the like according to the structural characteristics of the foundation, and the traditional methods have complicated procedures, influence on construction progress and high manufacturing cost.

The invention content is as follows:

in order to overcome the problems in the background art, the invention provides a roadbed direct filling construction process for a soft foundation area of a low-humidity paddy field of an expressway, which better solves the problems.

The technical scheme of the invention is as follows:

the process consists of the following procedures: construction preparation → surveying and laying → digging and draining ditch → filling weathered macadam → impact rolling → leveling → first layer geogrid → roadbed filling → second layer geogrid → roadbed filling → roadbed sealing

In the procedure of filling and paving weathered gravels, the gravels are impacted and rolled and the side wall is hammered and embedded into the roadbed soil layer.

The invention has the advantages that:

● the construction process is simple

The construction treatment technology for the soft foundation of the paddy field adopts a conventional construction process, and is simple and easy to master.

● accelerating construction progress

The technology has simple construction, does not need airing or digging and replacing filling treatment, and directly paves a layer of weathered macadam on the paddy field, reduces a plurality of construction procedures and quickens the construction progress.

● Green and environment-friendly construction

Through the construction technology, the amount of filled earth is greatly reduced; meanwhile, no waste soil is filled in the construction process, the land resource utilization is reduced, the pollution is avoided, the destructiveness is poor, and the method plays a positive promoting role in national soil resource protection and environmental ecological balance.

● has small sedimentation amount and good stability

By paving a thick layer of weathered macadam, on one hand, the contact surface of the bearing capacity of the material is increased, and on the other hand, soft soil on the surface of a low-humidity area is squeezed, so that the soft soil and the weathered macadam in the contact area are ensured to form a compact and stable integral plate; the laying of the two layers of steel-plastic geogrids greatly enhances the bearing capacity and the overall rigidity of the roadbed, reduces the settlement deformation and has good stability.

● has high economic performance

Compared with the traditional soft foundation treatment technology, the construction technology is simple and convenient, does not need to collect land in large quantity, reduces the construction investment, reduces the engineering cost and has considerable economic benefit.

● wide application range

The construction process is simple, the operation is convenient, the construction progress is accelerated, the construction investment is reduced, the quality requirement is met, the ecological environment is also actively protected, and the popularization and application range is wide.

The specific implementation mode is as follows:

the specific implementation method of the invention comprises the following steps:

construction preparation (1) → measuring paying-off line (2) → digging and draining ditch (3) → filling weathered macadam (4) → impact rolling (5) → leveling (6) → first layer geogrid (7) → roadbed filling (8) → second layer geogrid (9) → roadbed filling (10) → roadbed sealing (11)

Description of the drawings:

FIG. 1: construction process flow chart

FIG. 2: schematic diagram for observing arrangement of settlement gauge

FIG. 3: schematic diagram of displacement pile arrangement

FIG. 4: schematic diagram of impact rolling running track

Application example:

1. introduction to the word

The soft foundation area of the low-humidity paddy field is widely distributed in our living space, and for years, the soft foundation area brings much trouble to the road construction of China, and the defects of delayed construction progress, increased construction cost, damage to ecological environment and the like easily occur. Meanwhile, the subgrade settlement and the structural stability of the soft base region are key problems for controlling the engineering construction quality.

The traditional soft foundation treatment method for the paddy field soft foundation area is to adopt the traditional processes of mixing ash, turning, stirring, airing, digging, replacing and filling, compounding the foundation and the like according to the structural characteristics of the foundation, and the methods have complicated procedures, influence on the construction progress and have high manufacturing cost. In recent years, under the assistance and guidance of project construction command departments and highway reconnaissance and design houses in Heilongjiang province, the company masters a set of construction technologies for directly filling embankments in the construction of highways with soft foundation regions in low-humidity paddy fields. Through construction experience and examination in recent years, the soft foundation treatment construction technology has the advantages of simple construction process, engineering quality meeting, construction progress accelerating, construction investment reducing, green and environment-friendly construction and the like.

2. Structural features of roadbed

2.1 the construction process is simple

2.2 accelerate construction progress

2.3 construction is green and environment-friendly

2.4 small sedimentation amount and strong stability

2.5 high economic performance

Compared with the traditional soft foundation treatment technology, the construction method is simple and convenient, does not need to collect land in large quantity, reduces construction investment and engineering cost, and has considerable economic benefit.

2.6 wide popularization and application range

The construction method has the advantages of simple construction process, convenient operation, construction progress acceleration, construction investment reduction, quality requirement satisfaction, positive protection effect on ecological environment and great popularization and application range.

3. Application scope

The method is suitable for constructing soft foundation areas (such as water fields and the like) of roads, in particular to areas mainly containing saturated soft clay and silty clay. Meanwhile, the method is also suitable for the construction fields of activity squares, municipal roads and the like with poor geological conditions.

The applicable soil conditions are as follows: a construction area with moderate water content (preferably less than or equal to 40%) and large depth (preferably less than or equal to 1.5m) of the muddy clay.

4. Principle of the process

The direct filling of the roadbed with the soft base region of the low-humidity paddy field is to directly pave a thick layer of weathered broken stones in the region with higher water content and larger depth of muddy clay, increase the bearing force contact surface of roadbed materials, extrude the clay to form a compact and stable integral plate with the weathered broken stones, mutually interlock the weathered broken stones, enhance the bearing capacity, reduce the settlement deformation, lay a foundation for the subsequent roadbed filling work, eliminate common quality problems and ensure the engineering quality.

And after a layer of thick weathered macadam is directly paved, impact rolling is carried out, and a first layer of geogrid is paved so as to enhance the stability and the overall strength of the roadbed. And then carrying out roadbed filling construction by using common materials according to a conventional construction process, and paving a second layer of geogrid when the roadbed is filled to a position 20cm below the top surface of the roadbed until roadbed filling engineering is completed.

5. Construction process flow and operation key points

5.1 construction Process

Construction preparation → surveying and paying-off → digging of drainage ditch → paving of weathered macadam → impact compaction → leveling → first layer of geogrid → roadbed filling → second layer of geogrid → roadbed sealing (see figure 1).

5.2 operating points

5.2.1 preparation of construction

1. And (4) repairing and opening the construction access road to ensure that various construction vehicles are smooth and unobstructed.

2. Preparing personnel: and organizing personnel with abundant professional construction experience and management to carry out construction according to the planning requirements of the construction scheme.

3. Material preparation

And preparing sufficiently weathered broken stones in a specified stock ground range according to the design requirements of a drawing so as to meet the quantity and quality of construction progress requirements. And manufacturing a plurality of settlement plate devices for observing the settlement and the stability of the roadbed.

4. Preparing mechanical equipment: according to construction conditions, 2 bulldozers, 2 vibratory rollers, 1 cam roller, 1 grader, 20 dump trucks and the like are arranged on each filling working face. And additionally, 1 excavator is arranged to excavate the drainage ditch.

5. Technical preparation: laboratory field sampling for testing: a. the soil content of the weathered macadam; b. Analyzing the particles; c. crush number, etc.

6. Paving a test section: before the official start of work, the test road section is paved. Through the test road section, the optimal matching state of the construction machinery such as transportation, paving and rolling is determined, the construction process, the compaction method, the compaction coefficient, the rolling times and the like are determined, and a summary file is formed and serves as a subsequent large-scale construction technology guidance file.

5.2.2 measurement payoff

After the preparation work is finished, the line is accurately measured and set off according to the design requirements of the drawing, and the side pile and the central line control pile which are measured and positioned are marked and protected.

Two sides of each 20m straight line segment are respectively provided with a side pile, and two sides of each 10m curved line segment are respectively provided with a side pile. And marking the specific positions of the side ditches and the drainage ditches by using timber piles and lime lines.

In the construction process, construction technicians check and recheck at any time and find out problems and correct the problems in time.

5.2.3 side ditch and drainage ditch

According to design and construction requirements, a drainage ditch is transversely excavated along a construction route, side ditches are excavated outside slope feet on two longitudinal sides of the route, and a complete and smooth drainage system is formed in a roadbed construction area along the route. Reduce the road bed water content on the one hand, on the other hand can be outside the road bed is discharged to infiltration and sleet water, reinforcing road bed structural strength and overall stability.

1. Before the weathered broken stone is filled, firstly, a side ditch is excavated outside a slope toe of a route and in a floor area according to the design requirements of a drawing by using a mechanical and manual cooperation method. The size of the side ditch is as follows: the width of the bottom of the side ditch is 0.6m, the depth of the ditch is not less than 0.6m, and the slope ratio of the side slope is 1: 1.

2. After the side ditch is excavated, a transverse rectangular drainage ditch is mechanically excavated for the section to be filled with the roadbed, and the transverse rectangular drainage ditch extends to the side ditch and is communicated with the side ditch. The spacing of the transverse rectangular drainage ditches is generally 10-20 m, the width of the ditches is 0.6m, and the depth of the ditches is 0.3 m.

5.2.4 paving weathered macadam

1. The weathering macadam construction process flow comprises the following steps: cloth → paving and leveling → rolling → quality detection → transfer to next procedure for construction.

2. The main construction points

1) The material distribution method comprises the following steps: and (4) on site, a specially-assigned person instructs the skip car to discharge in the determined grid network, and a reverse discharging method is adopted. The material transporting dump truck does not run on the soft foundation of the paddy field, and the normal running of the material transporting vehicle is ensured.

2) Paving and leveling: and flattening by using a T140 or T160 bulldozer. The bulldozer advances along with the unloading speed and paves, levels and compacts the side-by-side chain according to the virtual high lines arranged on the two sides. After the whole body is basically flat and stable, static pressure is carried out for 1 time by adopting a vibratory roller with the weight of more than 20t so as to expose potential unevenness, and the depression is supplemented by adopting a mechanical and manual matching method.

3) Rolling: and rolling by adopting a ram-horn rolling vibratory roller and a smooth wheel vibratory roller.

And (3) rolling procedure: firstly, carrying out static pressure 1 time by using a horn roll vibratory roller to ensure that the material is preliminarily occluded stably, then carrying out weak vibration 1 time and strong vibration 3 times, and keeping medium-speed rolling at the rolling speed of 2-3 km/h; and then rolling for 2 times by using a smooth wheel vibratory roller to ensure that the surface is smooth and compact. Ensure the surface to be smooth and solid without obvious holes, obvious wheel tracks and the like.

And (3) rolling: the straight line segment is sequentially rolled from two sides to the middle, the small-radius curve is longitudinally overlapped 1/2-1/3 wheels in a reciprocating mode from the inner side to the outer side. When transverse joint is carried out, wheel tracks of the vibratory roller are generally overlapped by more than 1 m; ensuring no pressure leakage and dead angle, and ensuring even, smooth and compact rolling.

4) And (3) quality detection: the method mainly checks compactness, flatness, elevation, width, transverse gradient, apparent mass and the like.

3. Settlement plate and displacement pile

Before the weathered gravels are paved, settling plates and displacement piles are arranged according to requirements.

The setting method comprises the following steps: each section of the settlement observation instrument is provided with 3 settlement observation instruments (the left part, the middle part and the right part of the embankment), and the settlement observation instruments are required to fall on an original soil surface in front of roadbed filling when being buried. And 4 displacement piles are arranged on each section (arranged at the slope angles on two sides of the embankment and 3-5m away from the slope angles on two sides), the displacement piles are embedded by excavation, the height of the pile top exposed out of the ground is 10cm, the periphery of each pile is densely backfilled, and the backfilling material is made of plain cement concrete. (see attached FIG. 2 and FIG. 3)

5.2.5 first impact compaction

And after the weathering crushed stone is rolled, performing first impact rolling on the finished roadbed. The impact rolling equipment adopts trilateral double-wheel impact type road rolling equipment.

1. Principle of operation

The traction force of the trilateral double-wheel impact type road roller is 310 horsepower, and the mass of the impact wheel is 6000-16000 kg. The impact roller has large energy (25kJ) and the effective influence depth is about 1.4 m.

The impact compaction has the functions of static force, kneading, vibrating and tamping and impact. The non-cylindrical polygonal compaction double wheels roll forward by adopting trailer traction, the salient points of the compaction wheels and the impact plane generate alternate lifting and falling, the compaction wheels generate potential energy and kinetic energy, concentrated impact energy is generated on the ground, the filler or the ground is continuously and quickly tamped by utilizing low-frequency large-amplitude impact force, strong impact waves are generated on the filler and are transmitted to the deep layer under the foundation, the dissipation of pore water can be greatly accelerated on underground soft soil layers, particularly non-viscous saturated soil, and the consolidation speed of the soil is improved.

2. Impact rolling of roadbed

1) Before construction, underground pipelines in the pressing range and various structures nearby are found out, and obvious markers are arranged according to the characteristics of the structures for marking.

2) The culvert and the channel can be respectively reserved with a distance of 5m from the two sides of the culvert head, 5m is reserved for the bridge, and 5m is reserved for the underground pipeline.

3) The division and marking of the field are mainly based on the special overall dimension of the impact road roller, and if necessary marking running is not carried out on the field, pressure leakage or overpressure is easy to occur, and uneven compaction is caused. The marking can be performed in a rolling manner as shown in figure 4

4) The impact type road roller strictly operates according to technical requirements and construction standard requirements in the process of rolling the road base, and the impact compaction speed and the rolling times are ensured. Impact rolling is carried out from the two sides of the roadbed to the middle of the roadbed, so that the roadbed is prevented from moving laterally. The impact rolling is to run in a straight line as much as possible, the rolling is started from one side edge, and when the impact rolling runs to the end point of a rolled road section, the impact rolling is staggered by one wheel width in the direction of the center of the road and runs according to a track shown in the attached figure 4.

5) And moving the roller by 4m in the direction of the central line of the path for the third time to punch, repeating the process, adopting a staggered wheel mode for impact rolling, avoiding overlapping wheel tracks, and staggering 1/6 weeks every time in the longitudinal direction, so that the wave crest of the working surface is impacted every time, which is favorable for full distribution and uniformity of impact points and enhances the overall impact effect. The whole field is compacted once. The punching route of the third pass is completely consistent with that of the first pass; and the fourth time is consistent with the second time, and the like, until the rolling times of 8-10 times are finished.

6) When the impact type road roller works, the impact energy is large, and the safety distance of 1.5m is kept between the compacted outer edge and the outer edge of the road shoulder so as to avoid damaging the road shoulder. The impact rolling must be carried out according to the specified trend and arrangement mode, the compaction running speed of the impact road roller should be about 10-12 km/h, and the compaction effect is optimal.

7) In the impact rolling construction process, construction and supervision site specially-assigned persons are responsible for recording the construction processes of the rolling times, the rolling pile numbers, the rolling width, the driving speed, the working time and the like, and recording data for record.

5.2.6 leveling layer

And after the weathered macadam is paved and is subjected to impact rolling, before the first layer of steel-plastic geogrid is paved, a leveling layer with the thickness of 10cm is paved on the surface cover of the weathered macadam by using the standby roadbed filling in a construction section, and the leveling layer filling and the roadbed filling are made of the same material. The main functions of the leveling layer are as follows: firstly, filling gaps and leveling the surface to provide a good working surface for geogrid construction; secondly, the sealing effect is realized on the weathered rubble layer, rainwater is prevented from entering the roadbed before roadbed filling, and the roadbed engineering construction quality is ensured.

5.2.7 first layer of geogrid

The geogrid is a steel plastic grid, and the construction process comprises the following steps: detecting, cleaning a lower bearing layer → manually laying geogrid → lapping, binding and fixing → performing quality inspection → entering the next procedure. The construction key points are as follows:

1. the roadbed surface paved with the steel-plastic grating is smooth (less than or equal to 15mm), and hard projections such as broken stones and the like are strictly forbidden on the surface; the maximum grain size of the roadbed filling within 8cm from the steel-plastic grating layer is not more than 6 cm.

2. The steel-plastic grating is laid and stretched manually, the phenomena of folds, distortion and potholes are not allowed, the steel-plastic grating is fixed on the surface of a bearing layer by means of inserting nails and the like, and the distance is preferably 1.5m multiplied by 1.5 m.

3. The connection between the steel-plastic grids should be firm. The strength of the joint in the stress direction is not lower than the designed tensile strength of the material, the transverse overlapping length is not less than 30cm, and the longitudinal overlapping length is not less than 50 cm.

4. After the steel-plastic grating is laid, filling materials are filled in time to prevent the steel-plastic grating from being directly exposed to sunlight for too long time, and the common interval time is not more than 48 hours.

5. The first layer of filling soil of the steel-plastic grating is paved by adopting a light bulldozer or a front loader, and the paving thickness is controlled to be 20-30 cm. All vehicles and construction machines are allowed to run along the axis direction of the embankment.

5.2.8 roadbed filling

And after the first layer of the geogrid is filled with soil, carrying out roadbed filling work according to the technical index parameters of the roadbed engineering test section.

The roadbed filling construction process comprises the following steps: construction preparation → paving → leveling → rolling → inspection visa → entering the next floor.

1. The filling operation is carried out by a method of 'grid cutting and soil feeding, line hanging construction, cluster operation and small segment rapid forming', and according to the test segment soil filling loose paving thickness, a square grid is formed on the paving area of each vehicle by using a lime line to control the soil unloading range.

2. When filling, the water-saving filling material is gradually pushed to the roadside and the longitudinal direction from the middle of the road, and 2-4% of road arches and longitudinal slopes are kept, so that rainwater accumulation is prevented at any time, and filling quality is prevented from being influenced.

3. When the road roller rolls the roadbed, the principle of firstly lightening and then weighting, firstly stabilizing and then vibrating, firstly lowering and then raising, firstly slowing and then speeding and then overlapping wheel tracks is followed.

4. For high fill subgrades, impact compaction was performed as per 5.2.5 on demand per 1.5m fill height.

5. When the roadbed filling height is 20cm away from the top surface of the roadbed, carrying out impact rolling on the roadbed before sealing according to the construction method in 5.2.5.

5.2.9 second layer geogrid

And (5) after the roadbed is filled to the end of the last impact rolling process, paving a second layer of geogrid according to the design drawing and the requirements in 5.2.7.

The distance between the geogrid inserting nails is 1.0m multiplied by 1.0 m.

5.2.10 roadbed sealing layer

The main construction method of the roadbed sealing layer is the same as that of '5.2.8 roadbed filling'. But the construction process mainly strengthens the following construction links:

1. during construction, a control pile is additionally arranged, each curve section of every 10m of the straight line section is a section of every 5m, three steel rods are arranged at the left, middle and right parts of each section, and wires are hung according to loose paving thickness.

2. The seal material ensures that the grain diameter is smaller and qualified, and the material source is rich.

3. After the grader levels, the 'rice' grid line is hung manually for fine leveling.

4. The rolling speed is controlled to be 2-3 km/h.

5. The error of the water content of the sealing filler and the bottom soil is controlled within +/-2%. When the surface of the bottom soil loses water seriously, water should be properly sprayed and moistened before sealing.

5.2.11 quality testing

The quality detection in the construction process mainly comprises quality monitoring control of weathered macadam, geogrid, impact rolling, roadbed filling and the like.

The weathered macadam is mainly used for detecting compactness, flatness, elevation, width, transverse gradient, apparent mass and the like.

The impact rolling mainly controls the number of times of compaction, the walking path, the pile position of compaction, the rolling width, the running speed, the working time and the like.

The geogrid mainly controls the lap joint length, the inserting nail quality, the tiling, the tensioning, the firmness and the tightness and the like.

5.3 labor organization (Table 5.3)

TABLE 5.3 labor organization Listing

Serial number	Work species	Number of people	Work content
				1	Manager	2	Construction organization and site management
2	Professional technician	2	Quality, safety technical field guidance
				3	Special vehicle driver	11	Trenching, spreading, leveling, rolling, or the like
4	Driver of transport vehicle	25	Roadbed filling transportation (timely personnel adjustment)
				5	Survey team	3	Measurement lofting and settlement observation and the like
7	Test inspector	2	Filler testing, quality inspection
				8	On-site temporary work	15	Laying geogrids, finishing side slopes, marking grid lines and the like
9	Others	2	Commanding discharge, etc
				10	Total up to	62

6. Materials and apparatus

1. Material

The main materials required by the method are weathered macadam, geogrid and the like.

1) Weathering macadam: the natural weathered macadam is adopted, and the technical index requirements are shown in the table 6.1-1.

TABLE 6.1-1 technical indices of weathering macadam

Crush value (%)	Maximum particle size (cm)	Soil content (%)	Strength (MPa)
				≤25％	≤15	≤5％	＞15

2) Geogrid: the biaxially oriented steel-plastic composite geogrid (GSZ50-50) is adopted, and the technical parameters are shown in the table 6.1-2.

TABLE 6.1-2 Steel-plastic composite geogrid technical parameters

(note: the strength and elongation meet the index requirements in the table after not less than 40 freeze-thaw cycles when the anti-freezing index is required to be lower than 35 ℃ below zero.)

2. Device

The main implement equipment used per team (one work surface) is shown in table 6.2.

TABLE 6.2 Main implement and Equipment Meter

7. Quality control

7.1 the engineering construction quality executes the national industry standard, and each operation task is implemented according to the construction technical specification and the operation regulation.

The method comprises the steps of executing technical Specifications for highway subgrade construction (JTG F10-2006), highway geotechnical test regulations (JTG E40-2007), highway engineering aggregate test regulations (JTG E42-2005), highway subgrade and road surface field test regulations (JTG E60-2008), highway geosynthetic material application technical Specifications (JTG/T D32-2012), highway engineering construction safety technical regulations (JTJ 076-95), highway engineering quality inspection assessment standards (JTG F80/1-2004) and the like.

7.2 the actual measurement items of roadbed filling, weathered macadam, geogrid and the like are shown in tables 7.2-1, 7.2-2 and 7.2-3.

TABLE 7.2-1 actual measurement items for roadbed filling

TABLE 7.2-2 Weathered macadam actual measurement project

TABLE 7.2-3 geogrid actual measurement items

7.3 Settlement and Displacement Observation

1. Fill road section

And in the roadbed construction process, settlement and stable tracking observation are carried out according to design requirements, the observation frequency is kept to be adaptive to the settlement and stable deformation rate, observation is carried out once each layer is filled, if the interval time between two times of filling is long, observation is carried out at least once every 3d, if the foundation is abnormal, filling is immediately stopped and measures are taken for treatment, and filling can be continued after the embankment is stabilized. After the roadbed is filled, the period of preloading is regularly observed according to the stable condition of the roadbed, the observation is carried out once every 3d in the first month, every 7d in the second and third months, and every 15d from the fourth month until the road surface can be paved after the roadbed is settled and stabilized.

2. And the displacement observation adopts a total station forward intersection method, and the precision is required to reach 0.1 mm. In order to reduce observation errors, the observation of settlement and horizontal displacement is realized as follows:

1) the same observation line and observation method are adopted;

2) using the same instrument and equipment;

3) fixing an observer;

4) work under the same environment and conditions; the observation data ensures that the record is clear and can not be modified, and the data observed each time is properly kept in time and can not be dragged.

7.4 quality assurance measures

7.4.1 strengthen the quality consciousness and implement the first quality policy seriously. And establishing a sound and comprehensive quality management system, making construction technology bottom-crossing work, formulating a special construction scheme, scientifically managing and standardizing construction.

7.4.2 testing and detecting the filling materials and the geogrids according to the detection frequency and the detection method required by the specification.

7.4.3 well preparing construction layout before filling, and excavating side ditches and drainage ditches, reasonably arranging the settlement displacement observation devices, strengthening dynamic monitoring work in the construction process, and finding problems in time so as to take measures to process as soon as possible.

7.4.4 organize the construction production according to the test section, strengthen the process control. Particularly, the virtual paving thickness and the rolling times of the well weathered macadam are controlled, and the traveling route and the impact times of the well impact rolling are practically monitored.

8. Safety measures

8.1 in the construction process, deepen the safety education, strengthen the safety consciousness. Before the workers go on duty, the workers must carry out work and technology training and safety education, and remember the guideline of 'safety is first, prevention is first, and comprehensive treatment'.

8.2 the special operator must be certified on duty and forbidden to operate on duty without certification.

And 8.3, the standardized management of a construction site is enhanced, the standardized management consciousness of all members of a project department is enhanced, the enterprise management level is improved, and the standardization of safe production management is promoted.

8.4 strengthen the safety technology to meet the end work, make the safety and technical guarantee measure convey to the constructor in the heart really.

8.5 various safety warning marks are to be perfected on the construction site.

8.6 strictly perform a supervised inspection regime. In the construction process, professional security personnel can supervise and check the safety work at any time on the construction site, find the problems and solve the problems in time, so that the safety accidents are eliminated in the bud.

9. Environmental protection measure

9.1 department of project establishes an ecological environmental protection management organization according to the requirements of the three-in-one management system, strictly complies with laws, regulations and regulations about environmental protection issued by national and local governments in the engineering construction process, strengthens the control and treatment of construction fuel oil, engineering materials, equipment, waste water, production domestic garbage and waste slag, and complies with the regulations and regulations of fire prevention and waste treatment.

9.2 will construct the place and the operation restriction in the within range that engineering construction allowed, rationally arrange, standardize and enclose the fender, accomplish that the sign is clear, complete, various signs are striking, the neat civilization of construction place.

9.3, reliable implementation measures for preventing damage and displacement are made for various public facilities possibly influenced in construction, and monitoring, coping and verification in implementation are enhanced. Meanwhile, the related schemes and requirements are handed over to all constructors in detail.

9.4 set up special escape canal, sump pit, concentrate waste slurry, sewage, make innocent treatment carefully, prevent fundamentally that construction sewage from discharging at will.

9.5 preferably advanced environmental protection machinery is used. Noise reduction measures such as setting of a sound insulation wall and a sound insulation cover are adopted to reduce construction noise to be below an allowable value.

9.6 hardening the construction site road, and sprinkling water to the construction passing road frequently in sunny days to prevent dust from flying and polluting the surrounding environment.

10. Resource saving

10.1 establishing a resource-saving leader group, making a resource-saving regulation and regulation system, and performing propaganda and education in the daily construction process to improve the resource saving.

10.2 scientifically organizing construction and production, and strictly performing various activities according to construction technologies, thereby improving the labor productivity to the maximum extent and reducing the energy consumption of manpower, mechanical equipment and the like.

10.3 a low-humidity paddy field soft base region roadbed direct filling method reduces land utilization area, greatly reduces material consumption and saves a large amount of resources.

11. Benefit analysis

11.1 social benefits: the construction technology is adopted to treat the roadbed construction of the low-humidity water field, the operation is simple and easy to master, the construction quality is ensured, and the engineering construction quality requirement is met; and meanwhile, the highway construction fund is saved. Meanwhile, compared with soft foundation treatment technologies such as a filling method, a mixing pile method and the like, the process construction is environment-friendly and civilized, the capital can be saved, the engineering construction speed is increased, the development speed and market competitiveness of enterprises are greatly increased, and the social benefit is immeasurable.

11.2 economic benefits: by applying the construction process, the construction labor amount is reduced, the land acquisition fund is reduced, the number of borrows of the roadbed is reduced, the vegetation space occupied by the abandoned parties is avoided, the engineering progress speed is accelerated, and better economic benefit is generated.

11.3 environmental protection benefits: the process does not need to remove, replace or carry out composite treatment, reduces noise emission, land acquisition quantity, dust pollution degree and damage to vegetation, really achieves scientific construction, green construction and civilized construction, and plays a positive role in environmental protection.

Claims

1. A construction process for directly filling roadbed in soft foundation area of low-humidity paddy field of highway comprises the following steps: construction preparation (1) → measuring and paying-off (2) → digging and draining ditch (3) → filling and paving weathered gravels (4) → impact rolling (5) → measuring and leveling (6) → first layer geogrid (7) → roadbed filling (8) → second layer geogrid (9) → roadbed filling (10) → roadbed sealing (11)

2. According to the construction process for directly filling the roadbed in the low-humidity paddy field soft base region of the highway, the method comprises the following steps: and in the procedure of filling and paving weathered gravels (4), the gravels are impacted and rolled and the side wall is hammered and embedded into the roadbed soil layer.