CN112195956B - Construction method for power transmission line in desert area - Google Patents
Construction method for power transmission line in desert area Download PDFInfo
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- CN112195956B CN112195956B CN202010860540.2A CN202010860540A CN112195956B CN 112195956 B CN112195956 B CN 112195956B CN 202010860540 A CN202010860540 A CN 202010860540A CN 112195956 B CN112195956 B CN 112195956B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/80—Ground anchors
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/22—Improving land use; Improving water use or availability; Controlling erosion
Abstract
The invention discloses a construction method of a power transmission line in a desert area, which comprises the following steps: building a temporary construction road: transporting common loess or firmed soil from the outside, paving the common loess or firmed soil on the surface layer of the road, and rolling the common loess or firmed soil by using common construction machinery such as a forklift and the like; building and maintaining an iron tower foundation: after the foundation of the iron tower is maintained, erecting the power transmission iron tower by utilizing an inner pull wire suspension holding pole decomposition tower erecting method; after the iron tower is assembled, selecting a tension field, burying a gravity type ground anchor of a tension machine, adding a counterweight, and backfilling; conducting wire paying-off and tightening construction to complete the erection of the wires and the installation of accessories; after the construction of the iron tower stringing is finished, wind prevention and sand fixation construction is carried out on the desert area; after all the construction tasks are completed, sowing the grass seeds of the sandy plants under the tower, recovering the vegetation, and sowing the grass seeds to recover the original appearance of the construction site. The invention adopts the mode of building temporary roads and manufacturing simple gravity type ground anchors to improve the mechanical construction degree, reduce the construction risk and ensure the construction quality.
Description
Technical Field
The invention relates to a construction method of a power transmission line, in particular to a construction method of a power transmission line in a desert area.
Background
When the power transmission line construction is carried out in a desert area, the problems that the material transportation is difficult, the foundation maintenance difficulty is high, the ground anchor burying can not meet the uplift resistance requirement, the grassland vegetation is recovered after the construction, the backfill sand layer in the desert area is difficult to fix and the like exist in the construction process; the common construction method has the problems of difficult material and mechanical transportation, low construction efficiency, improper concrete curing, larger safety risk, high later-stage operation and maintenance cost of the line, serious environmental damage and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, and provides the method for constructing the power transmission line in the desert area, which can reduce the construction cost, accelerate the construction progress and shorten the construction period.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the construction of the power transmission line needs to transport a large amount of construction materials and construction machinery, and whether a transport road is smooth, convenient and fast directly relates to the whole construction progress; in desert areas, construction roads need to be built because construction vehicles with loose earth surface soil quality cannot normally run.
A construction method for a power transmission line in a desert area comprises the following steps:
s1: building a temporary construction road: the method comprises the steps of leveling floating sand on the surface of a road before beginning to repair the road, transporting common loess or firmed soil from the outside after leveling, paving the loess or firmed soil on the surface layer of the road, controlling the thickness to be more than 50 centimeters, then rolling by utilizing common construction machinery such as a forklift and the like, and watering and maintaining the road surface after compacting every day to harden the road surface and prevent dust pollution.
S2: building and maintaining an iron tower foundation: assembling a foundation template on a specified iron tower foundation, building the iron tower foundation in the template by using concrete, and starting to perform maintenance within 3 hours after the iron tower foundation is finished by using the concrete, wherein the maintenance method comprises the steps of covering a straw bag and water drenching on the surface of the concrete before the template is disassembled and backfilled when the temperature is higher than 5 ℃, and covering the top of an upright post by using the straw bag or loess and watering to keep the surface of the foundation moist; after the template is dismantled, the iron tower foundation is wound by a plastic film to prevent water from diffusing and is backfilled in time.
After the foundation formwork is dismantled and backfilled, in deserts and arid regions, in order to ensure that the foundation concrete is well maintained and the strength reaches the designed value, the outer leakage part of the iron tower foundation is wrapped by color strip cloth or plastic films to prevent water from being dispersed so as to ensure that the concrete is well maintained.
After the maintenance is finished, measuring the section size of the stand column, the center displacement of the whole foundation, the torsion of the whole foundation, the root opening and diagonal size of the foundation, the center offset of the stand column by the center of the foundation bolts of the same group, the height of the foundation top surface exposed by the foundation bolts and the height difference between the foundation top surfaces by using a theodolite and a steel ruler, taking a concrete test block for inspection, detecting the strength of the concrete test block, and visually inspecting the surface quality of the concrete; and after all the data meet the standard requirements, assembling the iron tower.
S3: assembling an iron tower: after the iron tower foundation is well maintained, checking the foundation root opening, the height difference and the torsion, and assembling the power transmission iron tower by using an inner stay wire suspension holding pole disassembling and assembling method after the check is qualified.
S4: selecting a tension field: after the iron tower is erected, selecting a tension field according to specific construction conditions, wherein the tension field comprises a traction field and a tension field, and the area of the traction field is not less than 30m × 25 m; the area of the tension field is not less than 55m by 25 m.
The traction field needs to meet the requirements that a tractor and a tensiometer can be directly transported to a proper position, and the road repairing amount is not large; the load capacity of the bridge can meet the requirement that the bearing capacity is not less than 250 kN; the terrain should be flat, and the requirements of arranging stretching equipment, arranging leads and constructing operation can be met; in addition, adjacent tangent towers of the tension field are allowed to pass through the wheel and face the anchor, and the condition that the wheel passes through the wheel and faces the anchor is generally as follows: a. the included angle of the anchor line to the ground is not more than 25 degrees; b. the anchor wire and the lead are not particularly difficult to crimp; the height difference angle between the outlets of the traction machine and the tension machine and the suspension point of the adjacent tower is not more than 15 degrees; in general, the tension field is not required to be arranged in a steering way and is limited by the terrain, and when the traction field selection is difficult to meet the requirements, the traction field can be arranged in a steering way through the steering pulleys.
S5: burying a tension machine gravity type ground anchor: the ground anchor of the tension machine is arranged in the tension field, a steel pipe with the diameter of 48mm is used for binding into a grid shape with the size of 1.5m multiplied by 2m, the grid shape is used as a load frame of the ground anchor, the load frame is placed on a common ground anchor, then a counterweight is stacked on the load frame, the counterweight is manufactured by sand and soil sealing bags and is uniformly paved on the load frame to increase the stress area and the friction coefficient of the ground anchor, a gravity type ground anchor is formed, and backfilling is carried out after the counterweight is added.
S6: and (3) wire releasing and tightening construction: after the work is finished, the paying-off and tightening construction of the lead can be carried out, the erection and the accessory installation work of the lead are finished, and the paying-off and tightening construction refers to the ordinary power transmission line erecting mode.
S7: wind prevention and sand fixation construction: after the construction of the iron tower stringing is finished, wind prevention and sand fixation construction is carried out on the circumference of the bottom of the iron tower stringing in a desert area; for a linear iron tower, a grass square sand barrier scheme is adopted, and for a tension iron tower, a grass square sand barrier + sand blocking fence scheme is adopted.
The grass square grid material is made of fresh salix psammophila strips or straws and cotton stalks, the specification is 1m multiplied by 1m, the exposed height of the salix psammophila strips is 20-50 cm, the salix psammophila strips are inserted into a sand layer for more than 15cm, grass seeds of the psammophytes are sowed in the grass square grids, and the higher survival rate of the planted psammophytes is guaranteed under the protection effect of the grass square grids. When the arranged sand willow twigs, straws or cotton stalk squares lose the protection effect due to rotting, the planted plants are in an initial scale and begin to play the effects of preventing and fixing sand without excessive maintenance on the grass squares.
The protection range of the ortholophana square grids is 35m multiplied by 35m, and the protection range of the strain turfgrass square grids is 40m multiplied by 40 m; the sand-blocking fence is formed by weaving firewood such as Salix mongolica branches, one end of each Salix mongolica branch is buried in sand, the other end of each Salix mongolica branch is exposed by 50cm, the porosity of the sand-blocking fence is 35% -40%, the sand-blocking fence is arranged on the outer side of the grass square sand barrier along the main windward direction, and the arrangement length of the sand-blocking fence is 1m of the extension of each grass square.
S8: restoring the construction road: after all construction tasks are completed, in order to reduce the influence of construction on the environment, the sandy plant grass seeds are sown under all towers for vegetation recovery, and after the construction is completed, the temporary construction road is deeply ploughed by more than 30cm by using a rotary cultivator or an excavator, and the grass seeds are sown, so that the original appearance of the construction site is recovered.
The invention has the following positive beneficial effects:
1. according to the construction method, the whole construction process is reasonably arranged according to the construction characteristics of the desert area in the construction process, each operation in the construction period is connected compactly, the mechanized construction degree is improved by adopting the ways of building temporary roads and manufacturing simple gravity type ground anchors, the construction risk is reduced, the construction quality is ensured, the construction cost is further reduced, the construction progress is accelerated, and the construction period is shortened; adopt the cover method to maintain the concrete, plant the grass square to the sand dune that removes easily after the construction is accomplished, reduce the later stage because of the fortune dimension cost that backfill soil is blown away and increase the line operation safety.
2. The method comprises the steps of maintaining a foundation in a dry environment, covering a straw bag and water spraying on the surface of concrete before removing and backfilling a template when the temperature is higher than 5 ℃, covering the top of an upright column with the straw bag or loess and watering to keep the surface of the foundation wet; after the template is dismantled, the iron tower foundation is wound by a plastic film to prevent water from diffusing and is backfilled in time, so that the construction quality of the foundation is ensured.
3. The simple gravity type ground anchor is manufactured by utilizing the conventional common ground anchor, the steel pipe and the steel plate, the pulling resistance of the ground anchor is increased, the safety risks of construction operators and machinery are reduced, the gravity type ground anchor is manufactured by utilizing the conventional tools and materials, the construction safety is improved, and the construction cost is reduced.
4. After the construction is finished, planting grass grids below the tower position in the desert area by using salix mongolica strips, broadcasting grass seeds in the grass grids, arranging a sand blocking fence on the windward side of the tower position, preventing the foundation from leaking due to the movement of a sand dune below the tower position, and reducing the potential safety hazard of line operation; and after all construction operations are finished, the constructed construction access is deeply ploughed by using a rotary cultivator, grass seeds are sowed for vegetation recovery, the damage and influence of the construction on the environment are reduced, and the ecological environment along the line is protected.
Drawings
FIG. 1 is a flow chart of the construction method of the power transmission line in the desert area.
Detailed Description
The invention will be further explained and explained with reference to the accompanying drawing 1 and the specific embodiments:
example (b): the construction of the power transmission line needs to transport a large amount of construction materials and construction machinery, and whether a transport road is smooth, convenient and fast directly relates to the whole construction progress; in desert areas, construction roads need to be built because construction vehicles with loose earth surface soil quality cannot normally run.
A construction method for a power transmission line in a desert area comprises the following steps:
s1: building a temporary construction road: the method comprises the steps of leveling floating sand on the surface of a road before beginning to repair the road, transporting common loess or firmed soil from the outside after leveling, paving the loess or firmed soil on the surface layer of the road, controlling the thickness to be more than 50 centimeters, then rolling by utilizing common construction machinery such as a forklift and the like, and watering and maintaining the road surface after compacting every day to harden the road surface and prevent dust pollution.
S2: building and maintaining an iron tower foundation: assembling a foundation template on a specified iron tower foundation, building the iron tower foundation in the template by using concrete, and starting to perform maintenance within 3 hours after the iron tower foundation is finished by using the concrete, wherein the maintenance method comprises the steps of covering a straw bag and water drenching on the surface of the concrete before the template is disassembled and backfilled when the temperature is higher than 5 ℃, and covering the top of an upright post by using the straw bag or loess and watering to keep the surface of the foundation moist; after the template is dismantled, the iron tower foundation is wound by a plastic film to prevent water from diffusing and is backfilled in time.
After the foundation formwork is dismantled and backfilled, in deserts and arid regions, in order to ensure that the foundation concrete is well maintained and the strength reaches the designed value, the outer leakage part of the iron tower foundation is wrapped by color strip cloth or plastic films to prevent water from being dispersed so as to ensure that the concrete is well maintained.
After the maintenance is finished, measuring the section size of the stand column, the center displacement of the whole foundation, the torsion of the whole foundation, the root opening and diagonal size of the foundation, the center offset of the stand column by the center of the foundation bolts of the same group, the height of the foundation top surface exposed by the foundation bolts and the height difference between the foundation top surfaces by using a theodolite and a steel ruler, taking a concrete test block for inspection, detecting the strength of the concrete test block, and visually inspecting the surface quality of the concrete; and after all the data meet the standard requirements, assembling the iron tower.
S3: assembling an iron tower: after the iron tower foundation is well maintained, checking the foundation root opening, the height difference and the torsion, and assembling the power transmission iron tower by using an inner stay wire suspension holding pole disassembling and assembling method after the check is qualified.
S4: selecting a tension field: after the iron tower is erected, selecting a tension field according to specific construction conditions, wherein the tension field comprises a traction field and a tension field, and the area of the traction field is not less than 30m × 25 m; the area of the tension field is not less than 55m by 25 m.
The traction field needs to meet the requirements that a tractor and a tensiometer can be directly transported to a proper position, and the road repairing amount is not large; the load capacity of the bridge can meet the requirement that the bearing capacity is not less than 250 kN; the terrain should be flat, and the requirements of arranging stretching equipment, arranging leads and constructing operation can be met; in addition, adjacent tangent towers of the tension field are allowed to pass through the wheel and face the anchor, and the condition that the wheel passes through the wheel and faces the anchor is generally as follows: a. the included angle of the anchor line to the ground is not more than 25 degrees; b. the anchor wire and the lead are not particularly difficult to crimp; the height difference angle between the outlets of the traction machine and the tension machine and the suspension point of the adjacent tower is not more than 15 degrees; in general, the tension field is not required to be arranged in a steering way and is limited by the terrain, and when the traction field selection is difficult to meet the requirements, the traction field can be arranged in a steering way through the steering pulleys.
S5: burying a tension machine gravity type ground anchor: the ground anchor of the tension machine is arranged in the tension field, a steel pipe with the diameter of 48mm is used for binding into a grid shape with the size of 1.5m multiplied by 2m, the grid shape is used as a load frame of the ground anchor, the load frame is placed on a common ground anchor, then a counterweight is stacked on the load frame, the counterweight is manufactured by sand and soil sealing bags and is uniformly paved on the load frame to increase the stress area and the friction coefficient of the ground anchor, a gravity type ground anchor is formed, and backfilling is carried out after the counterweight is added.
S6: and (3) wire releasing and tightening construction: after the work is finished, the wire can be paid off and tightened, and the erection of the wire and the installation of accessories are finished.
S7: wind prevention and sand fixation construction: after the construction of the iron tower stringing is finished, wind prevention and sand fixation construction is carried out on the circumference of the bottom of the iron tower stringing in a desert area; for a linear iron tower, a grass square sand barrier scheme is adopted, and for a tension iron tower, a grass square sand barrier + sand blocking fence scheme is adopted.
The grass square grid material is made of fresh salix psammophila strips or straws and cotton stalks, the specification is 1m multiplied by 1m, the exposed height of the salix psammophila strips is 20-50 cm, the salix psammophila strips are inserted into a sand layer for more than 15cm, grass seeds of the psammophytes are sowed in the grass square grids, and the higher survival rate of the planted psammophytes is guaranteed under the protection effect of the grass square grids. When the arranged sand willow twigs, straws or cotton stalk squares lose the protection effect due to rotting, the planted plants are in an initial scale and begin to play the effects of preventing and fixing sand without excessive maintenance on the grass squares.
The protection range of the ortholophana square grids is 35m multiplied by 35m, and the protection range of the strain turfgrass square grids is 40m multiplied by 40 m; the sand-blocking fence is formed by weaving firewood such as Salix mongolica branches, one end of each Salix mongolica branch is buried in sand, the other end of each Salix mongolica branch is exposed by 50cm, the porosity of the sand-blocking fence is 35% -40%, the sand-blocking fence is arranged on the outer side of the grass square sand barrier along the main windward direction, and the arrangement length of the sand-blocking fence is 1m of the extension of each grass square.
S8: restoring the construction road: after all construction tasks are completed, in order to reduce the influence of construction on the environment, the sandy plant grass seeds are sown under all towers for vegetation recovery, and after the construction is completed, the temporary construction road is deeply ploughed by more than 30cm by using a rotary cultivator or an excavator, and the grass seeds are sown, so that the original appearance of the construction site is recovered.
In the construction process: the station duty meeting and the safety operation ticket system are adhered to, and the content requirements of the station duty meeting and the safety operation ticket are strictly executed; the field constructors must wear the clothes uniformly according to the requirements of the project department, correctly wear the safety helmets with company marks, wear the clothes non-uniformly or wear other company marks labor protection appliances to forbid entering the field construction; the soil quality condition in the pit must be checked regularly during construction, and if the soil quality is poor, collapse is likely to occur, construction should be suspended, so that people are prevented from being injured by collapse; strictly obey the construction electricity management regulations, all electrical equipment and wires must be well insulated and reliably grounded, and a leakage protection device is installed; a fence and a safety warning are required to be arranged on a construction site, a temporary toilet is set up, and no people are allowed to enter the site; in addition, for the worker to strengthen education, all constructors must establish firm environmental awareness; the arrangement of the construction site must accord with the process flow and occupies little grassland as much as possible; materials, equipment and tools are reasonably arranged and stacked in order, so that the finished materials are cleaned in a clean field; the damage to the environment is reduced, the occupied area is reduced as much as possible, vegetation is destroyed as little as possible, and the occupied area for construction is not expanded as much as possible.
The inner Mongolian mountain can flourish Shanghai Temple power plant to send out the full length of a project line of 2 multiplied by 26.2km, two single loops are erected in parallel, 125 bases of a tower are newly built, 50% of tower positions of the whole line are located in a desert area, the rest 50% of tower positions are located in a grassland, the ground surface of the grassland area is sandy soil about 1m, the whole line has no construction road which can be passed, the construction method is adopted in the whole construction process, the whole construction process is in a safe, rapid and high-quality controllable state, no quality accident and safe production accident occur, and the good comment of all parties is obtained.
Constructing a 50cm construction temporary road before construction, carrying out watering maintenance on the road every day, after the foundation construction is completed and backfilling, watering the externally leaked part, carrying out foundation covering maintenance by adopting a PE film, forming a gravity ground anchor by using a phi 48 steel pipe fence and a sand bag to ensure pull-out resistance, after the line body is completed, carrying out wind prevention and sand fixation in a backfill soil area by using a wood pile fence, a sand willow strip, grass planting grids below a tower position of a desert area and other modes, and after all the constructions are completed, carrying out deep ploughing on the temporary road and scattering grass seeds for recovery.
According to the construction method, the whole construction process is reasonably arranged according to the construction characteristics of the desert area in the construction process, each operation in the construction period is connected compactly, the mechanized construction degree is improved by adopting the ways of building temporary roads and manufacturing simple gravity type ground anchors, the construction risk is reduced, the construction quality is ensured, the construction cost is further reduced, the construction progress is accelerated, and the construction period is shortened; adopt the cover method to maintain the concrete, plant the grass square to the sand dune that removes easily after the construction is accomplished, reduce the later stage because of the fortune dimension cost that backfill soil is blown away and increase the line operation safety.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent variations and modifications made to the above embodiment according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (3)
1. A construction method for a power transmission line in a desert area comprises the following steps:
s1: building a temporary construction road: leveling floating sand on the surface of a road before beginning to repair the road, transporting common loess or firmed soil from the outside after leveling, paving the common loess or firmed soil on the surface layer of the road, controlling the thickness to be more than 50 centimeters, then carrying out rolling by using common construction machinery such as a forklift and the like, and carrying out watering maintenance on the road surface every day after compaction so as to harden the road surface and prevent dust pollution;
s2: building and maintaining an iron tower foundation: assembling a foundation template on a specified iron tower foundation, building the iron tower foundation in the template by using concrete, and starting to perform maintenance within 3 hours after the iron tower foundation is finished by using the concrete, wherein the maintenance method comprises the steps of covering a straw bag and water drenching on the surface of the concrete before the template is disassembled and backfilled when the temperature is higher than 5 ℃, and covering the top of an upright post by using the straw bag or loess and watering to keep the surface of the foundation moist; after the template is removed, winding the iron tower foundation by using a plastic film to prevent water from dispersing and backfilling in time;
s3: assembling an iron tower: after the foundation of the iron tower is well maintained, checking the foundation root opening, the height difference and the torsion, and erecting the power transmission iron tower by utilizing an inner stay wire suspension holding pole decomposition tower erection method after the checking is qualified;
s4: selecting a tension field: after the iron tower is erected, selecting a tension field according to specific construction conditions, wherein the tension field comprises a traction field and a tension field, and the area of the traction field is not less than 30m × 25 m; the field area of the tension field is not less than 55m by 25 m;
s5: burying a tension machine gravity type ground anchor: arranging a traction machine ground anchor in a traction field, binding the ground anchor into a 1.5m multiplied by 2m grid shape by using a phi 48mm steel pipe, using the grid shape as a load frame of the ground anchor, placing the load frame on a common ground anchor, stacking a counterweight on the load frame, uniformly paving the counterweight on the load frame by using sand and soil sealing bags, increasing the stress area and the friction coefficient of the ground anchor to form a gravity type ground anchor, and backfilling after adding the counterweight;
s6: and (3) wire releasing and tightening construction: after the work is finished, the paying-off and tightening construction of the lead can be carried out, and the erection and the accessory installation work of the lead are finished;
s7: wind prevention and sand fixation construction: after the construction of the iron tower stringing is finished, wind prevention and sand fixation construction is carried out on the circumference of the bottom of the iron tower stringing in a desert area; for a linear iron tower, a grass square sand barrier scheme is adopted, and for a tension tower, a grass square sand barrier + sand blocking fence scheme is adopted;
the grass square grid material is made of fresh salix mongolica or straws and cotton stalks, the specification is 1m multiplied by 1m, the exposed height of the salix mongolica is 20-50 cm, the salix mongolica is inserted into a sand layer for more than 15cm, the grass seeds of the psammophytes are sown in the grass square grids, the protection range of the orthorhombic tower grass square grids is 35m multiplied by 35m, and the protection range of the strain tower grass square grids is 40m multiplied by 40 m; the sand-blocking fence is formed by weaving firewood such as Salix mongolica branches, one end of each Salix mongolica branch is buried in sand, the other end of each Salix mongolica branch is exposed by 50cm, the porosity of the sand-blocking fence is 35% -40%, the sand-blocking fence is arranged on the outer side of the grass square sand barrier along the main windward direction, and the arrangement length of the sand-blocking fence is 1m of the extension of each grass square;
s8: restoring the construction road: after all construction tasks are completed, in order to reduce the influence of construction on the environment, the sandy plant grass seeds are sown under all towers for vegetation recovery, and after the construction is completed, the temporary construction road is deeply ploughed by more than 30cm by using a rotary cultivator or an excavator, and the grass seeds are sown, so that the original appearance of the construction site is recovered.
2. The method for constructing the power transmission line in the desert area as claimed in claim 1, wherein the method comprises the following steps: in step S2, after the foundation form is removed and backfilled, in desert and arid area, in order to maintain the foundation concrete well and to make the strength reach the designed value, the leaking part of the iron tower foundation is wrapped with color strip cloth or plastic film to prevent the water from diffusing and to maintain the concrete well.
3. The method for constructing the power transmission line in the desert area as claimed in claim 1, wherein the method comprises the following steps: in step S2: after the maintenance is finished, measuring the section size of the stand column, the center displacement of the whole foundation, the torsion of the whole foundation, the root opening and diagonal size of the foundation, the center offset of the stand column by the center of the foundation bolts of the same group, the height of the foundation top surface exposed by the foundation bolts and the height difference between the foundation top surfaces by using a theodolite and a steel ruler, taking a concrete test block for inspection, detecting the strength of the concrete test block, and visually inspecting the surface quality of the concrete; and after all the data meet the standard requirements, assembling the iron tower.
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