CN112448322A - High-voltage cable laying under high-drop terrain condition and optimization method thereof - Google Patents
High-voltage cable laying under high-drop terrain condition and optimization method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 63
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- 238000004088 simulation Methods 0.000 claims abstract description 30
- 238000004458 analytical method Methods 0.000 claims abstract description 19
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- 229910052782 aluminium Inorganic materials 0.000 description 4
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle
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- G—PHYSICS
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- G06F2113/00—Details relating to the application field
- G06F2113/16—Cables, cable trees or wire harnesses
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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Abstract
The invention discloses a high-voltage cable laying and optimizing method under high-drop terrain conditions, wherein the laying method mainly comprises selection and arrangement of a tractor, a conveyor and rollers, the tractor is arranged at the tail end of a laid line, the conveyors are uniformly distributed on straight sections of the laid line, a roller set is arranged at a corner position of the laid line, the roller set comprises at least two rollers, the rollers in the roller set are distributed in an arc array and are adaptive to the angle of the corner position, then the tractor is used for drawing to finish laying, and the optimizing method mainly adopts a simulation analysis method to optimize an arrangement mode and tool parameters. By adopting the scheme, the construction difficulty is facilitated, the cable laying efficiency under the condition of complex terrain is improved, the economic benefit is reasonably controlled, the cable laying damage is reduced, the service life is prolonged, and the like.
Description
Technical Field
The invention relates to the technical field of cable laying, in particular to high-voltage cable laying under a high-drop terrain condition and an optimization method thereof.
Background
In urban municipal construction, high-voltage cables are generally buried, cities with complex terrains such as Chongqing are influenced by shortage of underground passage resources, the space of the buried high-voltage cables is greatly extruded, the topographic design of a cable tunnel is more complex, the trends of local concentration, crowded channels, steep deep slopes of the tunnel and the like are presented, complex terrains such as deep vertical shafts and long slopes generally exist in engineering practice, and the construction difficulty is very high.
To this kind of complicated topography that has deep shaft, long slope, cable lay facility man-hour, at the shaft section, because the cable dead weight is great, the cable will bear great lateral pressure in shaft top turning position, arouses cable oversheath damage and metal sheath deformation, brings great hidden danger for later stage cable safe operation. At the slope section, because of the dead weight of the cable, the cable will present the gliding trend on the slope, bring great safety risk for the construction.
In addition, a series of complex mechanical problems are involved in the cable laying process, the existing mainstream construction mode is still relatively extensive, the traction force, the lateral pressure and the deformation condition are not checked before construction, and special analysis is not carried out on key points which are easy to cause cable damage. Constructors still construct according to experience, design and construction units do not carry out systematic and deep analysis and research on cable protection modes, and effective theoretical data research on influences of exceeding local traction force and lateral pressure and partial damaged cable sheaths is lacked.
Disclosure of Invention
In view of the above, the invention provides a high-voltage cable laying method under a high-drop terrain condition and an optimization method thereof, so as to solve the technical problems of more cable damage and larger safety risk caused by the traditional laying method.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the key point of the method for laying the high-voltage cable under the high-drop terrain condition is that the method comprises the following steps,
s1, selecting a tractor, a conveyor and rollers according to the construction site topography and the engineering general situation;
s2, arranging a tractor, a conveyor and rollers according to the condition of a laid line, arranging the tractor at the tail end of the laid line, uniformly distributing the conveyors in straight sections of the laid line, and arranging a roller group at a corner part of the laid line, wherein the roller group comprises at least two rollers, and the rollers in the roller group are distributed in an arc array and are adaptive to the angle of the corner part;
s3, laying a traction rope of the tractor along the laying line and connecting the traction rope with a cable;
and S4, electrifying the tractor and the conveyor to work, and dragging the cable to the tail end of the laying line through the hauling rope to finish the laying.
By adopting the scheme, the conveyor of the straight line section is matched with the roller group at the corner part, so that the axial stress state of the cable is greatly improved, the problem of stress concentration of the cable at the corner part is solved, the side pressure is balanced, and the risk of failure of the corrugated aluminum sheath caused by overlarge side pressure between the cable at the corner part and the roller is reduced.
Optionally, rollers are arranged between adjacent conveyors on the horizontal and sloped sections of the laying line in step S2. By adopting the scheme, the bending deformation of the cable between the two conveyors can be reduced, the cable can be pulled in a basically linear posture, the deformation of the cable in the pulling process can be reduced, the service life of the cable can be prolonged, and the long-line pulling connection can be facilitated.
Optionally, in step S2, when the end of the horizontal segment on the laying line is connected to the vertical segment, the roller set at the corner between the horizontal segment and the vertical segment is in an arc shape of 90 °, and the roller set includes at least five rollers uniformly distributed. The rollers in the roller group are preferably distributed at a density higher than that of the rollers, so that the lateral pressure is balanced to a great extent, the contact load between a single roller and the cable is reduced, and the purpose of zero damage to the cable is achieved.
Optionally, at least two conveyors are provided in the vertical section. The cable mainly receives its gravity and axial tension stack at vertical section, takes place to warp easily, and through at vertical section installation conveyer in this application, can initiatively alleviate the stacking force effect, ensures that the cable can remove with more stable gesture at vertical section, reduces the damage, and can be better suit with follow-up topography.
Optionally, the initial conveyor on the ramp section is 3-7 meters from the vertical section when the end of the vertical section engages the ramp section. The conveyer on the slope adopts the above distribution density, is favorable to improving the utilization efficiency of conveyer, satisfies the cable slope simultaneously and draws the demand of laying.
Optionally, the horizontal segment and the adjacent rollers on the slope segment are separated by 5-8 m. The rollers adopt the distribution density, can effectively prevent the cable from bending, and is within a relatively low cost range.
Based on the high-voltage cable laying method under the high-drop terrain condition, the application provides an optimization method in a targeted manner, so that the laying method is more optimized, the cable damage is less in the laying process, the economic cost is lower, and the key point is that the method comprises the following steps:
t1, constructing a cable model according to the laying line and the cable parameters, constructing a structure model of a tractor, a conveyor and a roller according to the cable parameters, and configuring corresponding tool parameters;
t2, importing the structural models of the cable, the tractor, the conveyor and the roller into ANSYS software, establishing a finite element simulation model, and loading corresponding boundary conditions;
t3, analyzing the change situation of the cable local stress along with the traction distance, the change situation of the cable corner position local stress along with the traction distance, the change situation of the cable local strain along with the traction distance and the change situation of the cable local contact pressure along with the traction distance based on the simulation model to obtain the cable simulation side pressure and the simulation traction force;
t4, calculating the theoretical lateral pressure and the theoretical traction force which can be borne by the cable according to the cable parameters, and comparing the calculation result with the analysis result in the step T3;
t5, adjusting the arrangement density of the conveyor and the rollers in the simulation model, the configuration power of the conveyor and the tractor, and the distribution density of the rollers in the corner position roller group until the simulation side pressure and the simulation traction force are respectively smaller than the theoretical side pressure and the theoretical traction force;
t6, selecting proper number and power of conveyors and proper number and distribution density of rollers by combining the economic cost analysis.
The scheme is adopted, the finite element simulation model is used for simulating the infinite approaching condition, the stress condition of the cable in the traction process can be better simulated, the simulation condition can be conveniently compared with the theoretical lateral pressure and the traction force which can be actually borne by the cable, the cable can not be damaged by the simulation condition, the subsequent construction is carried out according to the simulation result, the construction efficiency is favorably improved, unnecessary engineering delay and the like are reduced, the cable can be better protected, and the economic cost and the like are controlled.
Compared with the prior art, the invention has the beneficial effects that:
the high-voltage cable laying and optimizing method under the high-drop terrain condition is beneficial to improving the cable laying efficiency under the complex terrain condition, is convenient for reasonably controlling the economic benefit, reduces the cable laying damage under the complex terrain condition, reduces the engineering difficulty and the damage risk, prolongs the service life of the cable and the like.
Drawings
FIG. 1 is a schematic diagram showing the distribution of a tractor, a conveyor, rollers and roller sets in the practice of the present invention;
FIG. 2 is a schematic view of a roller set;
FIG. 3 is a graph showing the relationship between the traction force at the first corner portion and the time during a conventional construction process;
FIG. 4 is a graph showing the contact stress at a first corner portion with time during a conventional construction process;
FIG. 5 is a graph showing the relationship between the traction force at the first corner portion and the time variation in the present embodiment;
FIG. 6 is a graph showing the contact stress at the first corner portion with time according to the present embodiment;
FIG. 7 is a schematic diagram of three comparative analytical tractive effort profiles;
fig. 8 is a comparative schematic diagram of three analytical piezometric stresses.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
As shown in the figure, the high-voltage cable laying method under the high-drop terrain condition mainly comprises four steps, namely, in the first step, according to the terrain of a construction site and the general situation of engineering, a tractor 1, a conveyor 2, rollers 3 and a power supply are selected, and particularly, according to the conditions of a laying line 5, including the levelness of a shaft, a corner angle or a slope inclination angle, the type of a cable and the like, the tractor 1 with proper power, the conveyors 2 with proper power and quantity, the rollers 3 with proper quantity and the like are selected.
And secondly, arranging selected auxiliary tools according to the levelness of a well, a corner angle or a slope inclination angle and the like according to the condition of a laid line 5, arranging a tractor 1 to the tail end of the laid line, uniformly arranging a conveyor 2 on straight sections (including a horizontal straight section, a vertical straight section and an inclined straight section) of the laid line, arranging a roller set 4 at a corner part, and connecting the tractor 1 and the conveyor 2 with a power supply.
The roller set 4 is composed of at least two rollers 3, the rollers 3 in the roller set 4 are distributed in an arc array, and the corresponding formed fan-shaped central angle is adapted to the angle of the corner position, so as to realize the smooth traction of the cable at the corner position, reduce the influence of side pressure, and it needs to be noted that in the step, the roller set 4 is installed according to the specific situation of the corner position, the orientation of the roller set 4 is adapted to the corner position, as shown in the figure, the first corner position 50 is outwards convex, the roller set 4 is also in a convex posture, the second corner position 51 is concave, and then the roller set 4 at the position is inwards concave.
And thirdly, erecting a traction rope of the tractor 1 along the laying line 5, and connecting the head end of the traction rope with a cable to ensure that the tractor 1 can draw the cable inlet wire through the traction rope during working.
And fourthly, electrifying the tractor 1 and the conveyor 2 to work, and drawing the cable to the tail end of the laying line 5, namely the position close to the tractor 1 by the aid of the tractor 1 and the conveyor 2 for cooperative conveying to finish laying.
In general, the laying line 5 has a horizontal section 52 (referring to a line section with an overall inclination angle smaller than 5 °) and a slope section 54 (referring to a line section with an inclination angle larger than 5 ° and smaller than 70 °), in order to reduce the friction influence of the cable in the two sections, rollers 3 are arranged between two adjacent conveyors 2 in the section, and the distance between the adjacent rollers 3 is in the range of 5-8 meters.
In addition, if there is a height difference between the horizontal section 52 and the slope section 54, and when the horizontal section 52 and the slope section 54 are connected through the shaft, the section constitutes the vertical section 53, a first corner portion 50 is formed between the horizontal section 52 and the vertical section 53, and a second corner portion 51 is formed between the vertical section 53 and the slope section 54, as shown in the figure, the first corner portion 50 and the second corner portion 51 are both provided with the roller set 4, wherein the angle of the first corner portion 50 is 90 °, so that the roller set 4 corresponds to a central angle of 90 °, and for the angle of the first corner portion 50, the roller set 4 is provided with at least five rollers 3, and similarly, the angle of the second corner portion 51 is about 120 °, so that the central angle of the roller set 4 corresponds to a central angle of 120 °, which includes at least 7 rollers 3, on the other hand, according to the specific position of the corner portion, the mounting orientation of the roller set 4 is noted, so that the cable can cross through two roller sets 4, the rolling friction reducing function is fully exerted.
At least two conveyors 2 are arranged in the vertical section 53, the specific number of which depends on the specific length of the vertical section 53, but at least two conveyors are arranged at positions (usually about 5 meters away from the end) above and below the end of the vertical section 53, which mainly keep the cable in a reasonable tensioned state, prevent the cable from loosening or curling and the like, and facilitate better traction laying.
On this basis, in order to ensure the amount of cable deflection after passing through the second corner portion 51, the conveyor 2 at the uppermost end of the ramp section 54 is disposed 3 to 7 meters from the lower end of the vertical section 53.
In order to further improve the practicability, feasibility and economy of the high-voltage cable laying method under the high-drop terrain condition, the application also provides an optimization method in a targeted manner, and the optimization method mainly comprises the following steps:
firstly, a cable model is constructed by utilizing three-dimensional modeling software PROE according to the specific shape of a laying line 5 and the parameters (including thickness, bending performance and the like) of a cable 6, the overall shape of the cable model corresponds to the laying line 5, then, according to the structural models of a cable parameter component tractor 1, a conveyor 2 and a roller 3, a model of a contact part between the component and the cable can be constructed, so that the modeling efficiency is improved, and finally, parameter configuration is carried out on each tool, and corresponding records are made.
Secondly, introducing the structural models of the cable, the conveyor 2 of the tractor 1 and the roller 3 of the first-step component into ANSYS software, establishing a finite element simulation model, and loading corresponding boundary conditions, wherein the simulation mainly aims to obtain axial deformation and radial deformation in the cable construction process, and influence of the conveyor and the tractor on axial stress of the cable, and the loaded boundary conditions mainly comprise that the front end of the cable applies forced displacement and the direction acting force of a reference point (namely the traction force of the tractor 1) is lifted; the back end of the computer applies back drag force to simulate the resistance of the back end of the cable; constraining all degrees of freedom of the roller 3 except the degree of freedom of rotation along the axis; the function between the limiting roller 3 and the cable is a friction function, and the friction coefficient is 0.1.
And thirdly, analyzing the change condition of the local stress of the cable along with the traction distance, the change condition of the local stress of the corner position of the cable along with the traction distance, the change condition of the local strain of the cable along with the traction distance and the change condition of the local contact pressure of the cable along with the traction distance based on the established finite element simulation model, and mainly obtaining the simulation side pressure and the simulation traction force of the cable.
And fourthly, calculating or looking up a table according to the cable parameters to obtain the theoretical side pressure and the theoretical traction which can be actually borne by the cable, and comparing the theoretical side pressure and the theoretical traction with the simulated side pressure and the simulated traction which are obtained in the third step respectively.
And fifthly, adjusting the arrangement density of the conveyor 2 and the rollers 3, the configuration power of the conveyor 2 and the tractor 1, and the distribution density and the number of the rollers 3 in the corner position roller group 4 in the finite element simulation model until the simulated side pressure is smaller than the theoretical side pressure and the simulated traction force is smaller than the theoretical traction force.
And sixthly, analyzing the adjustment result of the fifth step by combining economic cost, and selecting a conveyor 2 with proper quantity and power, rollers 3 with proper quantity and distribution density and roller groups 4 with proper structures by mainly considering the comprehensive service life of the cable, the acquisition cost, the abrasion cost, the installation cost and the like of the conveyor 2 and the rollers 3.
As shown in the figure, the high-voltage cable laying method under the high-drop terrain condition is applied to laying of a section of laying line 5 with the total length of about 420 meters, the topography of the laying line 5 is shown in figure 1, wherein the vertical section 53 is about 21 meters, the slope section 54 is about 92 meters, the self weight is large and about 32.6kg/m according to the table look-up of selected ZB-YJLW03-Z type cable parameters, the side pressure in the laying process is not more than 3kN/m, after optimization is carried out according to the optimization method, a roller 3 is selected to be arranged in the horizontal section 52 every 5 meters, two conveyors 2 are arranged in the vertical section 53, the position of the conveyor 2 at the highest position on the slope section 54 is 7 meters away from the upper end and the lower end, and the position of the conveyor 2 at the highest position on the slope section 54 is.
The angle of the first corner position 50 is 90 °, the central angle of the roller set 4 corresponding to the first corner position is 90 °, and for the angle of the first corner position 50, the roller set 4 is provided with five rollers 3 distributed in an arc array, similarly, the angle of the second corner position 51 is about 120 °, so the central angle of the roller set 4 corresponding to the first corner position is 120 °, the roller set comprises 7 rollers 3 distributed in an arc array, the rollers 3 in the roller set 4 can be fixed by the same retainer and arranged in a hoistway according to the figure, the formed turning radius is about 3 meters, and in the embodiment, a spring type bearing is preferably used as the roller 3 to reduce the friction coefficient.
In the conventional construction method, usually only the tractor 1 is arranged at the front end to provide traction force, the roller 3 is arranged at the horizontal section 52, but the conveyor 2 and the roller group 4 are not arranged at the middle and other sections, and the friction resistance in the horizontal section 52 is calculated by comparing the embodiment with the conventional laying method as follows:
the safety coefficient is 1.1 in the calculating process, the traditional roller 3 adopts a common bearing, the friction coefficient of the traditional roller is 0.2, and the comparison shows that by adopting the laying method, the resistance of the cable in the horizontal section 52 is far smaller than that in the traditional construction, the resistance is reduced, and the construction difficulty is obviously reduced.
In the conventional construction, only a single roller 3 is erected at a corner, and the side pressure generated by the roller group 4 in the embodiment is compared with the side pressure generated by the conventional single roller 3 as follows:
in the above calculation process, there are 5 rollers 3 in the roller set 4, as shown in the table, in the conventional construction process, the average lateral pressure of a single roller at the corner position is 30552.301N, while in the embodiment, the roller set 4 is used for connection, and the average lateral pressure of each roller is 7793.011N, compared with the lateral pressure of the roller which is reduced by nearly three times.
According to the electric power industry standard: the maximum allowable lateral pressure of the corrugated aluminum sheath on the roller wheel, as recommended in table a-6, is known from the city power cable line design specifications, as 2.0 KN. The maximum allowable side pressure values of the sheath layers of the specific cable are shown in the following table:
maximum allowable lateral pressure of cable sheath
According to the analysis of the calculation results, the side pressure value of the roller group 4 consisting of five rollers or a single roller conveying (side pressure: 30552.301N) does not meet the national standard requirement, and the side pressure value exceeds the allowable stress value by multiple times even if the multi-roller conveying is adopted. Therefore, the row standard requirement of the side pressure cannot be met by simply adopting the roller group for connection construction.
For this reason, in the present embodiment, the conveyor 2 is applied to the horizontal segment 52, the side pressure is further reduced by the cooperation of the conveyor 2 and the roller set 4, and if the axial force at the first corner 50 is reduced to 2749.982 n by applying the conveyor 2 to the horizontal segment, the side pressure of the roller 3 is reduced to 1983.675 n, which completely meets the requirement of the specification of urban power cable line design. The results of the side pressure calculations for the rear rollers of the application conveyor 2 are detailed in the following table:
applying conveyor rear roller side pressure calculations
From the above analysis and calculation, it can be known that the requirement of the row standard for the side pressure cannot be met only by using the roller set 4. If the roller group and the conveyor are combined for cable laying, the requirements of the row-mark DL/T5221-2016 can be met, and the cable is not damaged by radial extrusion in the laying process.
In addition, when the cable is laid, the traction force applied to the control cable is a key step for ensuring the laying quality, and the scheme of cable laying construction is also determined. The traction force is too large and exceeds the tension allowed to bear by the cable, so that the internal structure of the cable is damaged, the service life of the cable is influenced, and even the cable cannot be powered. The traction force is too small to be smaller than the friction force on the cable, and the cable is clamped in the laying process and cannot be laid in place. Therefore, before the traction machine pulls the laid cable, the actual laying path is surveyed and the mechanical traction force is checked so as to accurately control the traction process of the traction machine and ensure the cable laying quality. And when the cable laying facility works, sectional calculation is carried out according to the cable laying path. At present, in the construction of the Chongqing areas with complex terrains, the common laying paths comprise horizontal straight line laying, horizontal turning laying and slope straight line laying, and the total traction force is equal to the sum of the traction forces of all sections.
The traction force of the cable refers to the axial stress to which the cable is subjected during traction construction. The maximum allowable traction of a cable is in principle calculated as 1/4 of the tensile strength of the material to which the cable is subjected, this strength multiplied by the cross-sectional area of the material being the maximum compression. The cable has one outer sheath of PVC outside the main insulation, and the main insulation has lower allowable traction strength than that of the outer sheath, but the cross section area of the outer sheath is larger than that of the main insulation, and rubber plastic material is not as easy to generate permanent deformation as metal material, so that N/mm may be adopted2Allowing for the strength of the traction. When the traction force acts on different materials of the cable at the same time, the allowable value is the one with higher traction force intensity and the sectional area thereof. When the traction end is installed, the traction force is allowed to calculate only the allowable tension of the conductor.
Maximum tractive effort (N/mm) for different cabling methods2)
As calculated above, the axial frictional resistance is 21607.001N when the construction is performed by the conventional construction scheme, while the total resistance is 10803.501N when the construction is performed according to the embodiment. Substituting the above values into the row index to calculate the traction force calculation results of different laying methods as follows (N/mm)2)：
| Construction scheme | Copper core traction (N/mm)2) | Aluminum sheath (N/mm)2) | Plastic sheath (N/mm)2) |
| Traditional construction | 1.916 | 1.916 | 1.916 |
| This example | 0.958 | 0.958 | 0.958 |
According to the calculation result, the construction method is not only a traditional construction scheme, but also the embodiment; the axial traction of the cable at each layer is much lower than the specified value of the row standard. Therefore, for the axial traction force of the cable, the two construction schemes meet the requirements, but in the embodiment, the axial force borne by the cable is safer, and the power transmission and distribution accidents caused by axial deformation are difficult to occur. However, the traction force is only acted on the outer sheath in the construction process, and construction dangerous conditions that other layers are stressed are ignored. If all the acting force acts on the outer sheath, the axial traction of the plastic sheath in the traditional construction scheme reaches 8.774N/mm2The value of which has exceeded the value specified by the row standard. However, the axial traction force of the plastic sheath in this embodiment is 4.387N/mm2The value of the column index is not exceeded. The specific calculation results are shown in the table below.
Tractive effort calculation (N/mm) for different cabling methods2)
| Construction scheme | Plastic sheath (N/mm)2) |
| Traditional construction | 4.387 |
| This example | 8.774 |
Therefore, after the method is adopted, a good effect is achieved in the axial force control, hidden risks in the construction process can be effectively prevented, and by combining the comparison, the construction method provided by the application is obviously superior to the traditional construction method, and the damage to cables is smaller.
Naturally, the laying method of the present application and the conventional construction method can also be compared by using an optimization method similar to that provided by the present application:
firstly, modeling and ANSYS kinetic analysis are carried out on traditional construction, forced displacement is applied to a cable, the total displacement is 25 meters, the traction speed of a cable end is 6m/min, and the detailed parameters of a tractor 1 are as follows:
| parameter/model | JQY-50 |
| Rated tractive effort (KN) | 50 |
| Motor power (KW) | 5.5 |
| Suitable wire rope diameter (mm) | 15 |
| Traction speed (m/min) | 6 |
| Power supply (VAC) | 380 |
| Net weight of traction main unit (kg) | 495 |
| Traction main unit external dimension (mm) | 1430x700x720 |
In the traction construction process, the cable only bears the action of traction force, frictional resistance, supporting force and gravity, so that the three stresses are balanced. The analysis result shows that the cable is always in constant-speed motion in the construction process, so that the traction force and the main action of overcoming the frictional resistance are caused. The cable is acted on by gravity, supporting force, axial tension and friction force only at the horizontal section 52, and the two forces of the axial tension and the friction force reach balance. The cable is subjected to only gravitational and tensile forces in the vertical section 53. Therefore, the weight of the cable in the vertical section 53 is superimposed with the axial tension to equal the frictional resistance of the cable in the horizontal section. The traction force of the ramp section 54 is then added together with the gliding force of the cable, thereby overcoming the cable frictional resistance and doing work. Therefore, according to the stress analysis of the cable in the hoistway, the position where the axial force of the cable is the largest is easily seen as the first corner part 90, so that the stress condition of the position is intensively analyzed and compared, and the roller contact stress and the traction force of the position are derived as follows:
the cable is in a motion state in the construction simulation process, so the derived value is a stress value which changes although time changes. From the above table, the average values of the traction force and the lateral pressure of the roller at the vertical bending part are 2.353 (N/mm) respectively2) And 34865.212N, the detailed change of the traction force with time is shown in FIG. 3, and the change of the contact stress with time is shown in FIG. 4.
Next, simulation analysis is performed on the laying method of the present embodiment, the same tractor 1 is used, and the simulation dynamic operation is consistent with the conventional construction, and the performance parameters of the conveyor 2 are shown in the following table:
| parameter/model | JSD-5B |
| Diameter of transmission cable (mm) | φ74-φ180 |
| Rated conveying capacity (KN) | 5 |
| Transport speed (m/min) | 6 |
| Clamping torque (N.m) | 50 |
| Power supply (VAC) | 380, neutral point is grounded |
| Motor power (KW) | 0.37x2 |
| Net weight (kg) | 165 |
| Physical dimension (mm) | 970x485x385 |
The stress values of the cables at the roller set 4 over time are also derived, as shown in the following table:
for comparison analysis, the stress value of the cable in the construction process within 34 seconds in the construction process is also selected for comparison analysis. As can be seen from the above table, the average pull force of the cable is 1.173N/mm2The axial contact stress is 8997.962N, and the stress at the first corner portion 50 thereof is shown in FIG. 5 as a function of time, and the contact stress is shown in FIG. 6 as a function of time.
The results of comparing the data obtained from the analysis with those obtained from the previous analysis are shown in the following table:
three analysis traction stress pairs are shown in fig. 7 and side pressure stress pairs are shown in fig. 8, and the following conclusions can be drawn:
first, the simulation analysis value of the traction force in the conventional construction scheme and the scheme of the embodiment is higher than the theoretical calculation value. This is due to the fact that the theoretical calculation process does not take into account the fact that the cable between the two rollers undergoes a certain amount of flexural deformation during the laying of the cable. The portion is deflected and will provide some resistance to the cable during its travel. However, in the non-linear constitutive model of the dissociated cable, the software is a discretized conduction analysis of finite element forces when analyzed by ANSYS software. The calculation principle fully considers the three-dimensional stress change condition of the cable, so that the resistance formed by flexural deformation is calculated into the analysis result. Compared with a theoretical calculated value, the obtained stress value of the simulation analysis result is closer to a true value.
Second, compared with the solution of the present embodiment, the traction force value of the conventional construction is nearly twice as large. The main reason is that the conventional construction uses a single roller at the first corner portion 50, thereby causing a large bending stress to additionally act in the axial direction, resulting in a large traction force.
Third, in the present embodiment, since the horizontal section 52 is conveyed by the conveyor 3, the stress concentration of the cable at the first corner 50 is greatly reduced. Therefore, the stress of each section of the cable is relatively uniform in the whole construction process. The smaller axial force at the first corner 50 greatly improves the lateral pressure concentration of the roller 3 at this location. I.e. the lateral pressure of the roller 3 in this embodiment is much lower than that of the roller in the conventional construction scheme.
In short, by adopting the laying method of the embodiment, the axial stress state of the cable is greatly improved, the risk of failure of the corrugated aluminum sheath at a corner position due to overlarge lateral pressure is reduced, the service life of the cable is prolonged, the problem of stress concentration of the roller 3 is solved, and the contact load between the roller 3 and the cable is reduced.
Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.
Claims (7)
1. A high-voltage cable laying method under high-drop terrain conditions is characterized by comprising the following steps:
s1, selecting a tractor (1), a conveyor (2) and a roller (3) according to the construction site topography and the engineering general situation;
s2, arranging a tractor (1), a conveyor (2) and rollers (3) according to the condition of a laid line, arranging the tractor (1) at the tail end of the laid line, uniformly distributing the conveyors (2) on straight sections of the laid line, and arranging a roller group at a corner part of the laid line, wherein the roller group comprises at least two rollers (3), and the rollers (3) in the roller group are distributed in an arc array and are adaptive to the angle of the corner part;
s3, putting a traction rope of the tractor (1) along a laying line and connecting the traction rope with a cable;
and S4, electrifying the tractor (1) and the conveyor (2) to work, and drawing the cable to the tail end of the laying line through a drawing rope to finish laying.
2. A method of laying high voltage cables under high drop terrain conditions as claimed in claim 1, wherein: and in the step S2, rollers (3) are arranged between the adjacent conveyors (2) on the horizontal section and the slope section of the laying line.
3. A method of laying high voltage cables under high drop terrain conditions according to claim 1 or 2, characterised in that: in step S2, when the end of the horizontal segment on the laying line is connected to the vertical segment, the roller set at the corner between the horizontal segment and the vertical segment is in an arc shape of 90 degrees, and the roller set comprises at least five rollers (3) which are uniformly distributed.
4. A method of laying high voltage cables under high drop terrain conditions as claimed in claim 3, wherein: at least two conveyors (2) are arranged in the vertical section.
5. A method of laying high voltage cables under high drop terrain conditions according to claim 3 or 4, characterised in that: when the tail end of the vertical section is connected with the slope section, the distance between the initial conveyor (2) on the slope section and the vertical section is 3-7 m.
6. A method of laying high voltage cables under high drop terrain conditions as claimed in claim 2, wherein: the interval between the adjacent rollers (3) on the horizontal section and the slope section is 5-8 m.
7. A method for optimizing a high-voltage cable laying method under high-drop terrain conditions is characterized by comprising the following steps:
t1, constructing a cable model according to the laying line and the cable parameters, constructing structure models of the tractor (1), the conveyor (2) and the roller (3) according to the cable parameters, and configuring corresponding tool parameters;
t2, importing the structural models of the cable, the tractor (1), the conveyor (2) and the roller (3) into ANSYS software, establishing a finite element simulation model, and loading corresponding boundary conditions;
t3, analyzing the change situation of the cable local stress along with the traction distance, the change situation of the cable corner position local stress along with the traction distance, the change situation of the cable local strain along with the traction distance and the change situation of the cable local contact pressure along with the traction distance based on the simulation model to obtain the cable simulation side pressure and the simulation traction force;
t4, calculating the theoretical lateral pressure and the theoretical traction force which can be borne by the cable according to the cable parameters, and comparing the calculation result with the analysis result in the step T3;
t5, adjusting the arrangement density of the conveyor (2) and the rollers (3) in the simulation model, the configuration power of the conveyor (2) and the tractor (1), and the distribution density of the rollers (3) in the corner position roller group until the simulation side pressure and the simulation traction force are respectively smaller than the theoretical side pressure and the theoretical traction force;
t6, selecting a proper number and power of conveyors (2) and proper number and distribution density of rollers (3) by combining economic cost analysis.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113761694A (en) * | 2021-08-23 | 2021-12-07 | 国网上海市电力公司 | Thermal deformation simulation method of superconducting cable under different laying channel conditions |
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| CN114491895A (en) * | 2022-04-01 | 2022-05-13 | 广东电网有限责任公司东莞供电局 | Cable laying stress analysis method and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107657093A (en) * | 2017-09-14 | 2018-02-02 | 广东电网有限责任公司东莞供电局 | Cable laying traction and lateral pressure calculation method |
| CN107818233A (en) * | 2017-11-30 | 2018-03-20 | 中广核工程有限公司 | A kind of nuclear power plant's Design of Cable Layout method for optimizing route and its system |
| CN109217184A (en) * | 2018-08-07 | 2019-01-15 | 国网江苏省电力有限公司无锡供电分公司 | Big section, high drop Voltage Cable Lines Construction high point non junction continuously lay engineering method |
| CN109460595A (en) * | 2018-10-26 | 2019-03-12 | 江苏宏鹏电气科技有限公司 | A kind of power cable laying design method |
| CN110994465A (en) * | 2019-11-29 | 2020-04-10 | 中国二十二冶集团有限公司 | High-span multi-turn high-voltage cable laying method |
-
2020
- 2020-11-19 CN CN202011306724.0A patent/CN112448322A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107657093A (en) * | 2017-09-14 | 2018-02-02 | 广东电网有限责任公司东莞供电局 | Cable laying traction and lateral pressure calculation method |
| CN107818233A (en) * | 2017-11-30 | 2018-03-20 | 中广核工程有限公司 | A kind of nuclear power plant's Design of Cable Layout method for optimizing route and its system |
| CN109217184A (en) * | 2018-08-07 | 2019-01-15 | 国网江苏省电力有限公司无锡供电分公司 | Big section, high drop Voltage Cable Lines Construction high point non junction continuously lay engineering method |
| CN109460595A (en) * | 2018-10-26 | 2019-03-12 | 江苏宏鹏电气科技有限公司 | A kind of power cable laying design method |
| CN110994465A (en) * | 2019-11-29 | 2020-04-10 | 中国二十二冶集团有限公司 | High-span multi-turn high-voltage cable laying method |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113761694A (en) * | 2021-08-23 | 2021-12-07 | 国网上海市电力公司 | Thermal deformation simulation method of superconducting cable under different laying channel conditions |
| CN114883977A (en) * | 2021-08-23 | 2022-08-09 | 上海送变电工程有限公司 | Method and system for simulating superconducting cable laying test |
| CN113761694B (en) * | 2021-08-23 | 2024-02-06 | 国网上海市电力公司 | Thermal deformation simulation method of superconducting cable under different laying channel conditions |
| CN114239217A (en) * | 2021-11-09 | 2022-03-25 | 国网天津市电力公司 | Method for calculating cable traction in electric power pull tube |
| CN114239217B (en) * | 2021-11-09 | 2024-05-24 | 国网天津市电力公司 | Calculation method for cable traction force in electric power pulling pipe |
| CN114459655A (en) * | 2022-02-10 | 2022-05-10 | 国网上海市电力公司 | Superconducting cable steering side pressure monitoring system and paying-off control strategy |
| CN114491895A (en) * | 2022-04-01 | 2022-05-13 | 广东电网有限责任公司东莞供电局 | Cable laying stress analysis method and device |
| CN114491895B (en) * | 2022-04-01 | 2022-08-30 | 广东电网有限责任公司东莞供电局 | Cable laying stress analysis method and device |
| CN115906387A (en) * | 2022-09-21 | 2023-04-04 | 北京青城未来科技有限公司 | Construction method and simulation system of high-voltage cable laying simulation model |
| CN115906387B (en) * | 2022-09-21 | 2023-10-31 | 内蒙古电力勘测设计院有限责任公司 | Construction method and simulation system of high-voltage cable laying simulation model |
| CN116933609A (en) * | 2023-09-15 | 2023-10-24 | 中铁电气化局集团有限公司 | In-phase traction power supply cable power supply loop guide connection construction simulation method and system |
| CN116933609B (en) * | 2023-09-15 | 2023-12-12 | 中铁电气化局集团有限公司 | In-phase traction power supply cable power supply loop guide connection construction simulation method and system |
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