CN107387873B - Steel-belt-reinforced polyethylene spiral corrugated drainage pipe foundation structure and construction method - Google Patents

Abstract

The invention aims to provide a steel strip reinforced polyethylene spiral corrugated drainage pipe foundation structure and a construction method thereof. The technical scheme of the invention is as follows: the anti-seepage drainage device is composed of a groove, an anti-seepage geomembrane, a laying layer, poured water, a vibrating rod and a drainage pipe, wherein two drainage ditches are arranged at the bottom of the groove, the laying layer is composed of a foundation laying layer and a stable laying layer, and the drainage pipe is composed of a filling belt, an outer bonding layer, an outer steel belt, an inner bonding layer, an inner steel belt and a hot melting belt. The steel belt reinforced polyethylene spiral corrugated pipe realizes combined welding by using a hot-melt belt at the pipeline connecting end to carry out hot extrusion, so that the joints of two pipes are tightly bonded, the joint of the pipe orifice has certain strength, and the connection tightness of the pipeline is further enhanced; and when carrying out the pipeline and laying, the vibration of annotating water on the sand foundation layer in the ditch inslot that lays the pipeline makes the interval reduce between the sand foundation layer for the sand foundation layer is more closely knit, thereby reduces constructor and machines, reduces the operating cost, raises the efficiency.

Description

Steel-belt-reinforced polyethylene spiral corrugated drainage pipe foundation structure and construction method

Technical Field

The invention relates to the field of pavement pipeline laying, in particular to a steel belt reinforced polyethylene spiral corrugated drainage pipe foundation structure and a construction method thereof.

Background

In recent years, along with the coming of government restriction and elimination of concrete pipe policy in various regions, the improvement of the overall environmental protection consciousness in urban and rural areas begins to use part of plastic buried drain pipes with larger diameters in parts of regions. But the rigidity of the large-diameter plastic pipe ring is obviously insufficient, and the application of the steel belt reinforced polyethylene corrugated pipe makes up the defect of insufficient rigidity of the large-diameter plastic pipe ring. And the sealing performance of the pipe orifice is greatly improved by a welding technology. In the construction of general steel band reinforced polyethylene corrugated pipes, the radial displacement and the pipeline deformation are easily generated due to the fact that the foundation is not compact and the backfill height is too large. And the quality of the connection of the steel strip reinforced polyethylene spiral corrugated pipe is the most important factor influencing the quality and the service life of the pipeline.

The steel belt reinforced polyethylene spiral corrugated pipe realizes combined welding by using a hot-melt belt at the pipeline connecting end to carry out hot extrusion, so that the joints of two pipes are tightly bonded, the joint of the pipe orifice has certain strength, and the connection tightness of the pipeline is further enhanced; and when carrying out the pipeline and laying, the vibration of annotating water on the sand foundation layer in the ditch inslot that lays the pipeline makes the interval reduce between the sand foundation layer for the sand foundation layer is more closely knit, thereby reduces constructor and machines, reduces the operating cost, raises the efficiency. The spiral steel rib that this tubular product pressed into approximate lambda type with continuous steel band twines including, between the filling layer of outer two-layer hot melt area connection, when carrying out pipe laying, let one side have the pipeline one end in hot melt area and do not take the one end interconnect in hot melt area, the high rigidity of steel, the pliability of high strength and polyethylene, corrosion resistance combines together, when can making tubular product accomplish high radial stiffness, effectively save the quantity of plastics, save the cost and lighten weight, and have the quality light, wear-resisting, the shock resistance is strong, the leakproofness is good, the inner wall is smooth, flow resistance is little, installation construction convenience and long service life etc. are showing the advantage. In addition, in the grooving process before pipeline laying, two forms of open grooving or mixed grooving are adopted, a longitudinal drainage ditch is reserved on each side of the bottom of the groove, a layer of impermeable geomembrane is laid, then, a double-layer paving mode is adopted for the paving layer, the lower layer adopts a foundation paving layer of crushed stones with particle sizes, the upper layer adopts a stable paving layer of medium coarse sand or gravel, the two ends of the impermeable geomembrane are higher than the whole paving layer, and the two sides of the impermeable geomembrane are wrapped to the side slope of the groove all the time. The water injection vibration can put down the two sides of the geotextile from the side slope to enter the drainage ditch, and the vibration makes the geotextile flow to the two sides of the side ditch along with the geotextile after the geotextile is infiltrated underwater, and the geotextile is pumped out by a water pump. And then, the vibrating flat plate is used for operating, so that the saturated sand layer is liquefied, the saturated sand layer is compacted due to the reduction of gaps, the surrounding environment is not polluted, the environment-friendly performance is high, the vibrating flat plate can be constructed under various geological conditions and geographic environments, the vibrating flat plate is convenient and quick, the social benefit is very high, and the brought economic benefit is very obvious.

Disclosure of Invention

The invention aims to provide a method for realizing combined welding by using a hot-melt belt at a pipeline connecting end to carry out hot extrusion during pipeline connection, so that the interfaces of two pipelines are tightly bonded, the joint of the pipe orifice has certain strength, and the connection tightness of the pipeline is further enhanced; and when the pipeline is laid, the sand foundation layer in the groove for laying the pipeline is injected with water and vibrated, so that the gap between the sand foundation layers is reduced, the sand foundation layer is more compact, constructors and machines are reduced, the operation cost is reduced, and the efficiency is improved.

The technical scheme of the invention is as follows: a steel band reinforced polyethylene spiral corrugated drainage pipe foundation structure and a construction method thereof are characterized in that: by slot, prevention of seepage geomembrane, lay the layer, fill water, the stick of vibrating and drain pipe are constituteed, the prevention of seepage geomembrane is located the inside of slot, prevention of seepage geomembrane is fixed connection with the slot, lay the upper portion that the layer is located prevention of seepage geomembrane, it is fixed connection with the prevention of seepage geomembrane to lay the layer, it is located the inside of slot to fill water, it is swing joint with the slot to fill water, the stick of vibrating is located the upper portion of laying the layer, the stick of vibrating is swing joint with laying the layer, the drain pipe is located the inside of slot, the drain pipe is fixed connection with the slot and laying the layer.

Further, still be equipped with a plurality of escape canal on the slot, wantonly the escape canal is located the lower part of slot, the escape canal is fixed connection with the slot, the quantity in a plurality of escape canal is 2.

Further, the anti-seepage geomembrane is waterproof cloth or multi-layer plastic cloth.

Further, lay the layer and constitute by basic layer of laying and firm layer of laying, basic layer of laying is located the upper portion of prevention of seepage geomembrane, basic layer of laying is fixed connection with prevention of seepage geomembrane, firm layer of laying is located the upper portion of basic layer of laying, firm layer of laying is fixed connection with basic layer of laying.

Still further, the layer is laid to the basis is the particle size rubble, firm layer of laying is well coarse sand or gravel.

Further, the drain pipe comprises packing area, outer bond line, outer steel band, interior bond line, interior steel band and hot melt area, outer bond line is located the outside of packing the area, outer bond line is fixed connection with the packing area, outer steel band is located the outside of outer bond line, outer steel band is fixed connection with outer bond line, interior bond line is located the inboard in packing the area, interior bond line is fixed connection with the packing area, interior steel band is located the inboard of interior bond line, interior steel band is fixed connection with interior bond line, the hot melt area is located one side of drain pipe, hot melt area is fixed connection with the packing area.

Still further, the material of the filling belt is high density polyethylene.

Still further, the outer bonding layer and the inner bonding layer are made of bonding resin.

Still further, the hot melt strip is a polyethylene strip with a built-in resistance wire.

The invention has the beneficial effects that: the steel belt reinforced polyethylene spiral corrugated pipe realizes combined welding by using a hot-melt belt at the pipeline connecting end to carry out hot extrusion, so that the joints of two pipes are tightly bonded, the joint of the pipe orifice has certain strength, and the connection tightness of the pipeline is further enhanced; and when carrying out the pipeline and laying, the vibration of annotating water on the sand foundation layer in the ditch inslot that lays the pipeline makes the interval reduce between the sand foundation layer for the sand foundation layer is more closely knit, thereby reduces constructor and machines, reduces the operating cost, raises the efficiency. The spiral steel rib that this tubular product pressed into approximate lambda type with continuous steel band twines including, between the filling layer of outer two-layer hot melt area connection, when carrying out pipe laying, let one side have the pipeline one end in hot melt area and do not take the one end interconnect in hot melt area, the high rigidity of steel, the pliability of high strength and polyethylene, corrosion resistance combines together, when can making tubular product accomplish high radial stiffness, effectively save the quantity of plastics, save the cost and lighten weight, and have the quality light, wear-resisting, the shock resistance is strong, the leakproofness is good, the inner wall is smooth, flow resistance is little, installation construction convenience and long service life etc. are showing the advantage. In addition, in the grooving process before pipeline laying, two forms of open grooving or mixed grooving are adopted, a longitudinal drainage ditch is reserved on each side of the bottom of the groove, a layer of impermeable geomembrane is laid, then, a double-layer paving mode is adopted for the paving layer, the lower layer adopts a foundation paving layer of crushed stones with particle sizes, the upper layer adopts a stable paving layer of medium coarse sand or gravel, the two ends of the impermeable geomembrane are higher than the whole paving layer, and the two sides of the impermeable geomembrane are wrapped to the side slope of the groove all the time. The water injection vibration can put down the two sides of the geotextile from the side slope to enter the drainage ditch, and the vibration makes the geotextile flow to the two sides of the side ditch along with the geotextile after the geotextile is infiltrated underwater, and the geotextile is pumped out by a water pump. And then, the vibrating flat plate is used for operating, so that the saturated sand layer is liquefied, the saturated sand layer is compacted due to the reduction of gaps, the surrounding environment is not polluted, the environment-friendly performance is high, the vibrating flat plate can be constructed under various geological conditions and geographic environments, the vibrating flat plate is convenient and quick, the social benefit is very high, and the brought economic benefit is very obvious.

Drawings

Fig. 1 is a front view of the present invention.

Fig. 2 is a schematic cross-sectional structure of the present invention.

Fig. 3 is a schematic view of a welded connection of the present invention.

FIG. 4 is a schematic view of a trench structure according to the present invention.

FIG. 5 is a schematic view of the trench water injection vibrating structure of the present invention.

FIG. 6 is a schematic view of a trench drainage structure according to the present invention.

Fig. 7 is a schematic view of the pipe laying structure of the present invention.

Wherein: 1. groove 2, drainage ditch 3 and anti-seepage geomembrane

4. Laying layer 5, foundation laying layer 6 and stable laying layer

7. Pouring water 8, vibrating rod 9 and drain pipe

10. Filling belt 11, outer adhesive layer 12 and outer steel belt

13. Inner adhesive layer 14, inner steel band 15, hot melt band

Detailed Description

The following provides a brief description of embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6 and fig. 7, the foundation structure of the steel strip reinforced polyethylene spiral corrugated drain pipe and the construction method thereof are characterized in that: constitute by slot 1, prevention of seepage geomembrane 3, lay layer 4, pouring water 7, vibrating rod 8 and drain pipe 9, still be equipped with a plurality of escape canal 2 on the slot 1, arbitrary escape canal 2 is located the lower part of slot 1, escape canal 2 is fixed connection with slot 1, prevention of seepage geomembrane 3 is located the inside of slot 1, prevention of seepage geomembrane 3 is fixed connection with slot 1, it is located the upper portion of prevention of seepage geomembrane 3 to lay layer 4, it is fixed connection with prevention of seepage geomembrane 3 to lay layer 4, it comprises layer 5 and firm layer 6 of laying by the basis to lay layer 4, layer 5 is located the upper portion of prevention of seepage geomembrane 3 is laid to the basis, layer 5 is laid for fixed connection with prevention of seepage geomembrane 3 to the basis, layer 6 is laid to stabilize and is located the upper portion of layer 5, layer 6 is laid to stabilize with layer 5 of laying the basis and is fixed connection, the pouring water 7 is located in the groove 1, the pouring water 7 is movably connected with the groove 1, the vibrating rod 8 is located on the upper portion of the laying layer 4, the vibrating rod 8 is movably connected with the laying layer 4, the drain pipe 9 is located in the groove 1, the drain pipe 9 is fixedly connected with the groove 1 and the laying layer 4, the drain pipe 9 is composed of a filling belt 10, an outer bonding layer 11, an outer steel belt 12, an inner bonding layer 13, an inner steel belt 14 and a hot melting belt 15, the outer bonding layer 11 is located on the outer side of the filling belt 10, the outer bonding layer 11 is fixedly connected with the filling belt 10, the outer steel belt 12 is located on the outer side of the outer bonding layer 11, the outer steel belt 12 is fixedly connected with the outer bonding layer 11, the inner bonding layer 13 is located on the inner side of the filling belt 10, the inner steel belt 14 is located on the inner bonding layer 13, the inner steel belt 14 is fixedly connected with the inner adhesive layer 13, the hot melt belt 15 is positioned on one side of the drain pipe 9, and the hot melt belt 15 is fixedly connected with the filling belt 10. The number of the plurality of drainage ditches 2 is 2. The anti-seepage geomembrane 3 is waterproof cloth or multi-layer plastic cloth. The foundation paving layer 5 is gravel with particle size. The firm laying layer 6 is medium coarse sand or gravel. The material of the filling band 10 is high density polyethylene. The materials of the outer bonding layer 11 and the inner bonding layer 13 are bonding resin. The hot-melt belt 15 is a polyethylene strip belt with a built-in resistance wire. The width of the built-in resistance wire type polyethylene strip-shaped belt is more than 2 cm. The hot extrusion is PE viscous fluid heated by a welding gun. The hot extrusion material is PE viscous fluid heated by a welding gun.

The working mode is as follows: the hot-melt strip of the pipeline connecting end is used for hot extrusion to realize combined welding during pipeline connection, so that the joints of two pipelines are tightly bonded, the joint of the pipelines has certain strength, and the connection tightness of the pipelines is further enhanced; and when the pipeline is laid, the sand foundation layer in the groove for laying the pipeline is injected with water and vibrated, so that the gap between the sand foundation layers is reduced, the sand foundation layer is more compact, constructors and machines are reduced, the operation cost is reduced, and the efficiency is improved. The actual operation is completed according to the steps of measuring and lofting, trenching and slotting, foundation bedding, water injection and vibration, pipeline laying, pipeline welding and pipeline backfilling.

Firstly, measurement lofting: measuring the positions of the pipeline central line and the well body by using a measuring instrument such as a total station instrument, and the like, and determining the accurate position of the pipeline by taking the position of the well body of the pipeline starting and stopping point as a pipeline position control point during setting. Due to actual pay-off error or pipe joint length limitation, the pipe joint needs to be moved and can be properly displaced.

Secondly, ditching and grooving: the pipeline is laid on an undisturbed soil foundation or a foundation which is processed by slotting and then is backfilled to be compact, and sharp and hard objects and the like exist at the bottom of the groove and need to be removed in time. When the pipeline foundation is lower than the height of the terrace and the road bed in the present situation, the pipeline slotting mode can be determined according to the position of an engineering design pipeline and the soil condition, two forms of open slotting or mixed slot are generally adopted, and a longitudinal drainage ditch 2 is reserved on each of two sides of the bottom of the groove 1; the bottom of the groove can not be soaked by water, and when construction is carried out in rainy seasons, a groove anti-foaming measure is adopted to prevent accidents such as pipe floating, groove wall collapse and the like; if artificial precipitation is adopted, excavation can be carried out when the underground water is stabilized below the groove.

Thirdly, basic bedding: the pipeline foundation should be located on an undisturbed soil layer. If the elevation of the bottom of the channel is located at the bottom of the current river channel and the channel, the channel is completely desilted to the current soil layer, soil and stone chips are changed and filled to the bottom of the pipeline foundation, and the changing and filling width is consistent with the width of the bottom of the channel. Firstly, a layer of impermeable geomembrane 3 is paved at the bottommost part of the ditch 1, namely at the upper parts of the two drainage ditches 2. Then, the laying layer adopts a double-layer laying mode, the lower layer adopts a basic laying layer 5 of crushed stones with the grain diameter, and the upper layer adopts a stable laying layer 6 of medium coarse sand or gravel. At the two side axillary angles (supporting angle range) where the bottom of the pipeline is contacted with the foundation, the pipeline must be densely backfilled by medium coarse sand or gravel. For soft soil foundation, when the bearing capacity of the foundation is smaller than the design requirement or the undisturbed soil surface of the foundation influences the bearing capacity of the foundation due to reasons such as construction precipitation and the like, the foundation must be reinforced first, and after the specified bearing capacity of the foundation is reached, the stable laying layer 6 is laid. And finally, checking that the two ends of the impermeable geomembrane 3 are higher than the whole paved layer 4, and the two sides of the impermeable geomembrane are wrapped to the side slopes of the grooves 1.

Fourthly, water injection and vibration: after manual leveling, performing water injection operation to ensure that the height of the injected water 5 slightly exceeds the overall height of the laying layer 4; and then, a vibrating rod 8 is inserted into the laying layer 4 for vibrating, at the moment, the two sides of the geotextile are put down from the side slope and enter a drainage ditch, and the geotextile flows to the two sides of the side ditch along with the geotextile after being infiltrated underwater by vibration and is pumped out by a water pump. And then, operating by using a vibrating flat plate to liquefy the saturated sand layer, so that the saturated sand layer is compact due to the reduction of gaps, and laying a pipeline after the compactness meets the requirement.

Fifthly, laying a pipeline: the steel band reinforced polyethylene spiral corrugated pipe is a new composite material drain pipe, it adopts the filling layer 10 of the high density polyethylene as the basal body, and coat outer bond line 11 and inner bond line 13 which adopts the adhesive resin as the adhesive medium respectively in the inside and outside both sides of the filling layer 10, thus form the main supporting structure of inner steel band 14 and outer steel band 12, and twine and compound into the integrative double-walled spiral corrugated pipe with the filling layer 10, this pipe presses the continuous steel band into the spiral steel rib similar to the inverted V-type and twines between the filling layer 10 that the two-layer 15 of outer hot melt strips connect, when carrying on the pipeline laying, let one side of pipeline with hot melt strip 15 and one end interconnect without hot melt strip 15. The high rigidity and high strength of steel and the flexibility and corrosion resistance of polyethylene are combined together, so that the pipe can achieve high radial rigidity, effectively save the using amount of plastics, save cost and reduce weight, and has the remarkable advantages of light weight, wear resistance, strong shock resistance, good sealing property, smooth inner wall, small flow resistance, convenient installation and construction, long service life and the like.

Sixthly, welding the pipeline: first, the duct and the hot-melt tape 15 are inspected for damage, the duct is aligned, and foreign materials are removed. The impurities (including water vapor) on the outer surface of the pipeline and the inner wall of the electric melting zone are thoroughly removed by clean cloth, and oil dirt can be wiped by solvent which is helpful for welding the high-density polyethylene material. The pipeline can be directly placed on the foundation by digging an operation pit on the foundation. The parts to be connected of the horizontally aligned pipelines are tightly encircled by an electric melting belt. Then, the outer surface is fastened by a heat-resistant belt, and the end head is in the same direction with the inner ring of the electric heating belt and is in one position. The electric melting belt and the pipe wall are tightly close to each other by clamping with a clamp, and the inner wall of the pipe end at the interface is firmly supported by a detachable tool. And connecting the output wire end of the welding machine with the connecting wire head of the hot melting belt 15, setting time and gear positions for welding on the electric melting welding machine, and welding according to an operation rule. Checking whether the welding line of the heating wire is intact; before electrifying, the electric heating belt is fastened by the locking buckle belt, and then the current and the electrifying time are set according to the type of the pipeline. In order to ensure safety, the operation with water is strictly forbidden. The construction operation of the electric melting belt is carried out by a welder qualified through training and examination according to the welding process and the operation requirement provided by a pipe production plant after shaping and verification. And then, after the electric heating tape is welded and cooled, the non-lap joint part of the edge of the welding tape and the interface is subjected to repair welding by adopting a hot extrusion method. The method is carried out by adopting an 'inner welding outer coating' or an 'outer welding outer coating', wherein the 'inner welding outer coating' is that the pipes are connected by hot melt extrusion welding inside, and the pipes are connected by an electric melting belt outside. The outer welding is formed by externally welding and extruding and welding due to the difficulty in welding the inner part of an operator. In addition, in the welding process, the acceptable electrifying current and electrifying time are different according to pipe diameters of different specifications, and the detailed parameters are shown in the following table:

pipe diameter	Electrified Current (A)	Current(s)
			400	9～10	350
500	10～11	350
			600	10～12	400
700	11～12	450
			800	12～13	500
900	12～13	530
			1000	13～14	600
1200	14～15	700

And after welding, naturally cooling, not moving a welding machine tool in the cooling process, ensuring that the joint is not influenced by external force, and moving the welding machine tool to the next working point after cooling.

Seventhly, backfilling pipelines: the trench should be backfilled immediately after the pipeline is laid. And after the tightness is qualified through inspection, other parts are required to be refilled in time. Temporary limiting measures are adopted when necessary to prevent floating. The pipe bottom foundation part is required to be refilled in a short range from the pipe bottom foundation part to the position above the pipe top, and the mechanical bulldozer is strictly forbidden to refill. Sludge, organic soil and frozen soil cannot be backfilled. The backfill soil should not contain stones, bricks and other large objects with edges and corners.

The steel strip reinforced polyethylene corrugated pipe is simple in structure and convenient in construction process, particularly, the joint of two pipe connectors is tightly bonded by adopting a hot extrusion and electric hot melting strip combined welding method in a welding process, the joint of the pipe connectors has certain strength, and the connection tightness of pipelines is enhanced. Through the vibration of water injection on the sand foundation, make the space reduction between the sand foundation, it is more closely knit, can not cause the pollution to the surrounding environment, the feature of environmental protection is high to can all be under various geological conditions and geographical environment under be under construction, convenient and fast, social is very high, the economic benefits who brings is very showing.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (8)

1. A construction method of a steel strip reinforced polyethylene spiral corrugated drainage pipe foundation structure is characterized by comprising the following steps: the structure comprises a groove, an anti-seepage geomembrane, a laying layer, poured water, a vibrating rod and a drain pipe, wherein the anti-seepage geomembrane is positioned inside the groove, the anti-seepage geomembrane is fixedly connected with the groove, the laying layer is positioned on the upper part of the anti-seepage geomembrane, the laying layer is fixedly connected with the anti-seepage geomembrane, the poured water is positioned inside the groove, the poured water is movably connected with the groove, the vibrating rod is positioned on the upper part of the laying layer, the vibrating rod is movably connected with the laying layer, the drain pipe is positioned inside the groove, and the drain pipe is fixedly connected with the groove and the laying layer;

step one, measurement lofting: measuring the positions of a pipeline central line and a well body by using a total station measuring instrument, determining the accurate position of a pipeline by taking the position of the well body at the starting and stopping point of the pipeline as a pipeline position control point during paying off, and moving and appropriately shifting the pipeline due to actual paying off errors or pipe section length limitation;

step two, ditching and grooving: the pipeline is laid on an original soil foundation or a foundation which is processed and backfilled densely after being grooved, sharp and hard objects exist at the bottom of the groove, the sharp and hard objects need to be removed in time, when the pipeline foundation is lower than the height of the existing terrace and road foundation, the grooving mode of the pipeline can be determined according to the position of the engineering design pipeline and the soil condition, two forms of open grooving or mixed grooving are usually adopted, and a longitudinal drainage ditch is reserved on each of two sides of the bottom of the groove; the bottom of the groove can not be soaked by water, and when the construction is carried out in rainy season, a groove anti-foaming measure is adopted to prevent the accidents of pipe floating and groove wall collapse; if artificial precipitation is adopted, excavation can be carried out when the underground water is stabilized below the groove;

step three, basic bedding: the pipeline foundation is required to be located on an undisturbed soil layer, if the elevation of the bottom of the groove is located at the bottom of a current river channel and a channel, the pipeline foundation is required to be completely desilted to the current soil layer, earth and stone chips are changed and filled to the bottom of the pipeline foundation, and the changing and filling width is consistent with the bottom width of the channel;

firstly, paving a layer of impermeable geomembrane at the bottommost part of the groove, namely the upper parts of the two drainage ditches;

secondly, a double-layer paving mode is adopted for the paving layer, a foundation paving layer of crushed stones with the particle size is adopted for the lower layer, a stable paving layer of medium coarse sand or gravel is adopted for the upper layer, the armpit angles at two sides, which are in contact with the foundation, at the bottom of the pipeline, namely the range of the supporting angles, must be densely backfilled by the medium coarse sand or gravel, when the bearing capacity of the foundation is smaller than the design requirement or the bearing capacity of the foundation is influenced by the disturbed surface of the original soil of the foundation due to construction precipitation, the foundation must be firstly reinforced, and the stable paving layer is paved after the specified bearing capacity of the foundation is reached;

finally, checking that two ends of the impermeable geomembrane are higher than the height of the whole paved layer, and wrapping the two sides of the impermeable geomembrane to the side slope of the groove;

step four, water injection and vibration: after manual leveling, performing water injection operation to ensure that the height of the injected water slightly exceeds the overall height of the paved layer; then, a vibrating rod is inserted into the paved layer for vibrating, at the moment, two sides of the impermeable geomembrane are put down from the side slope and enter the drainage ditch, the underwater seepage is caused by vibration, then the underwater seepage flows to two sides of the drainage ditch along with the impermeable geomembrane, the seepage is removed by a water pump, and then a vibrating flat plate is used for operating, so that the saturated sand layer is liquefied, the gap is reduced to be compact, and when the compactness meets the requirement, a pipeline can be paved;

step five, laying a pipeline: the steel band strengthens the polyethylene spiral corrugated pipe, it uses the packing layer of the high density polyethylene as the basal body, and coat and use the outer bond coat and inner bond coat of the adhesive resin as the adhesive medium respectively inside and outside the packing layer, thus form the main supporting structure of the inner steel band and outer steel band, and twine and compound into the integrative double-walled spiral corrugated pipe with the packing layer, the pipe material presses the continuous steel band into the spiral steel rib similar to the type of Λ and twines outside the packing layer which coats inner, outer two layers of bond coats, while carrying on the pipeline laying, let one side of pipeline with hot melt tape connect with one end without hot melt tape each other;

step six, welding a pipeline: firstly, checking whether the pipeline and the hot-melting belt are damaged or not, aligning the pipeline and removing impurities, completely removing the impurities on the outer surface of the pipeline and the inner wall of the hot-melting belt by using clean cloth, wherein the impurities comprise water vapor and oil dirt which can be wiped by using a solvent which is helpful for welding a high-density polyethylene material, directly placing the pipeline on a foundation by digging an operation pit on the foundation, and tightly enclosing the part to be connected of the horizontally aligned pipeline by using the hot-melting belt;

then, fastening the outer surface by using a heat-resistant belt, clamping the end head and the inner ring of the hot-melting belt in the same direction and at the same position by using a clamp so as to enable the hot-melting belt to be abutted against the pipe wall, simultaneously firmly supporting the inner wall of the pipe end at the interface by using a detachable tool, connecting the output end of a welding machine with a connecting wire head of the hot-melting belt, setting time and gear on the electric melting welding machine, welding according to an operation procedure, and checking whether the welding wire is intact; before electrifying, the hot melt belt is fastened by the locking buckle belt, then the current and the electrifying time are set according to the type of the pipeline, in order to ensure the safety and strictly forbid the operation with water and the construction operation of the hot melt belt, the hot melt belt is connected and constructed by a welder qualified through training and examination according to the welding process and the operation requirement provided by a pipe production factory after shaping and verification;

then, after the welding and cooling of the hot melt strip, the hot extrusion method is adopted to repair weld the non-lap joint part of the edge and the interface of the welding strip, and the method of 'inner welding outer coating' or 'outer welding outer coating' is adopted, wherein the inner welding outer coating refers to that the pipe is connected by hot melt extrusion welding inside, the outer part is connected by the hot melt strip, and the 'outer welding outer coating' refers to that the outer part is connected by hot melt extrusion welding outside because the inner welding is difficult for an operator, and in addition, the acceptable electrifying current and electrifying time are different according to the pipe diameters of different specifications in the welding process;

after welding, naturally cooling, wherein a welding machine tool is not required to be moved in the cooling process, the joint is not influenced by external force, and the welding machine tool is moved to the next working point after cooling;

seventhly, backfilling pipelines: the method is characterized in that the trench is backfilled immediately after the pipeline is laid, other parts are backfilled in time after the tightness is qualified, a temporary limiting measure is adopted if necessary to prevent floating, the bottom foundation part of the pipeline starts to be within a short range above the top of the pipeline, manual backfilling is needed, a mechanical bulldozer is strictly forbidden to backfill, silt, machine-made soil and frozen soil cannot be backfilled, and the backfilled soil does not contain stones, bricks and other miscellaneous hard large objects with edges and corners.

2. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 1, wherein: still be equipped with a plurality of escape canal on the slot, arbitrary the escape canal is located the lower part of slot, the escape canal is fixed connection with the slot, the quantity of a plurality of escape canal is 2.

3. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 1, wherein: the anti-seepage geomembrane is waterproof cloth or multi-layer plastic cloth.

4. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 1, wherein: the layer of laying comprises basic layer of laying and the layer of laying firmly, basic layer of laying is located the upper portion of prevention of seepage geomembrane, basic layer of laying is fixed connection with prevention of seepage geomembrane, firm layer of laying is located the upper portion of basic layer of laying, firm layer of laying is fixed connection with basic layer of laying.

5. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 4, wherein: the layer is laid to the basis is the particle diameter rubble, firm layer of laying is well coarse sand or gravel.

6. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 1, wherein: the drain pipe comprises filling layer, outer bond line, outer steel band, interior bond line, interior steel band and hot melt area, outer bond line is located the outside of filling layer, outer bond line is fixed connection with the filling layer, outer steel band is located the outside of outer bond line, outer steel band is fixed connection with outer bond line, interior bond line is located the inboard of filling layer, interior bond line is fixed connection with the filling layer, interior steel band is located the inboard of interior bond line, interior steel band is fixed connection with interior bond line, the hot melt area is located one side of drain pipe, hot melt area is fixed connection with the filling layer.

7. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 6, wherein: the outer bonding layer and the inner bonding layer are made of bonding resin.

8. The construction method of the basic structure of the steel strip reinforced polyethylene spiral corrugated drainage pipe as claimed in claim 6, wherein: the hot melting belt is a built-in resistance wire type rubber tube.

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