CN110965583A - Pipe gallery turning structure, design method of combination curve of pipe gallery turning structure and comprehensive pipe gallery - Google Patents
Pipe gallery turning structure, design method of combination curve of pipe gallery turning structure and comprehensive pipe gallery Download PDFInfo
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Abstract
The invention provides a pipe gallery turning structure, a combined curve design method thereof and a comprehensive pipe gallery, wherein the pipe gallery turning structure comprises at least one curve turning section, the curve turning section is provided with an inner curve gallery wall and an outer curve gallery wall, and the inner curve gallery wall and the outer curve gallery wall respectively comprise a first gallery wall, a second gallery wall and a third gallery wall which are sequentially connected, wherein: the first gallery wall has a round-curved inner concave surface, the second gallery wall has a linear surface, the third gallery wall has a round-curved outer convex surface, the round-curved inner concave surface has a first radius of curvature, and the round-curved outer convex surface has a second radius of curvature. The pipe gallery turning structure, the design method of the combined curve of the pipe gallery turning structure and the comprehensive pipe gallery solve the problems that the ventilation of the pipe gallery is not smooth and people and/or equipment smoothly pass.
Description
Technical Field
The invention relates to the technical field of underground pipe gallery design, in particular to a pipe gallery turning structure, a combination curve design method thereof and a comprehensive pipe gallery.
Background
The pipe gallery is a structure and an accessory facility which are built under the city and used for accommodating city municipal pipelines. The tunnel space is built under the city, and various engineering pipelines such as electric power, communication, gas, heat supply, water supply and drainage and the like are integrated, wherein the cable pipe gallery refers in particular to the city underground tunnel space which only contains electric power and communication cables.
At present, all kinds of pipelines must be completely built in an area provided with a pipe gallery, the areas outside the pipelines must not be newly built with the pipelines, particularly for a large number of unsettled overhead cables in a city, cable landing and corridor must be carried out, wherein the cable landing and corridor mainly comprises 10kv cables and 110kv cables.
Because piping lane cost and space are limited, and cable demand capacity is great in addition, consequently can compress the inner space as far as possible in the design process, this has just caused that the inside action space that supplies the staff to overhaul or escape under the dangerous situation of city underground pipe gallery is very limited, is unfavorable for personnel's work and action, also is difficult to guarantee the required maintenance of every cable and turn the space simultaneously. The electric power cable adopts two sides to arrange in the piping lane, and the cabin is in underground space and less action space in addition, very easily makes the maintainer produce oppression in the heart, is unfavorable for long-term operating condition's the maintenance and the maintenance of psychological state under the emergency.
Particularly, as the municipal road often has a canalization section or a widening section, for the urban underground pipe gallery designed along the line position of the road, in order to meet the requirement of the line position, the urban underground pipe gallery must be turned along with the line position; or when the obstacle needs to be avoided on the plane, the turning on the plane is needed. At present, the internal dog-ear of adopting 45 or other fixed angles usually folds, and design and construction have been simplified to a certain extent to this kind of design though, have reduced engineering cost, but often can cause the blind area in the piping lane fortune dimension expert personnel vision, aggravate mental state's depression, also can cause certain influence to the inside ventilation of piping lane, the transportation of pipeline and personnel's evacuation escape simultaneously, have certain drawback.
Disclosure of Invention
The invention aims to provide a pipe gallery turning structure, a combined curve design method thereof and a comprehensive pipe gallery, and solves the problems of unsmooth ventilation of the pipe gallery and smooth passing of personnel and/or equipment.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a pipe gallery turning structure, which comprises at least one curve turning section, wherein the curve turning section is provided with an inner curve gallery wall and an outer curve gallery wall, and the inner curve gallery wall and the outer curve gallery wall respectively comprise a first gallery wall, a second gallery wall and a third gallery wall which are sequentially connected, wherein:
the first gallery wall has a round-curved inner concave surface, the second gallery wall has a linear surface, the third gallery wall has a round-curved outer convex surface, the round-curved inner concave surface has a first radius of curvature, and the round-curved outer convex surface has a second radius of curvature.
In an embodiment of the invention, the width between the second gallery wall of the inner curvilinear gallery wall and the second gallery wall of the outer curvilinear gallery wall is less than the width between the first gallery wall of the inner curvilinear gallery wall and the first gallery wall of the outer curvilinear gallery wall, and less than the width between the third gallery wall of the inner curvilinear gallery wall and the third gallery wall of the outer curvilinear gallery wall.
In an embodiment of the invention, the width between the second gallery wall of the inner curvilinear gallery wall and the second gallery wall of the outer curvilinear gallery wall is greater than or equal to 1 m.
In an embodiment of the present invention, in a state where the cable is laid on the inner curved gallery wall of the curved turning section, a first curvature radius of the circular-curved inner concave surface of the inner curved gallery wall and a second curvature radius of the circular-curved outer convex surface of the inner curved gallery wall are a sum of the minimum curvature radius and an additional value of the turning radius of the cable.
In an embodiment of the present invention, in a state where the cable is laid on the outer curved gallery wall of the curved turning section, a first curvature radius of the circular-curved inner concave surface of the outer curved gallery wall and a second curvature radius of the circular-curved outer convex surface of the outer curved gallery wall are a sum of the minimum curvature radius and an additional value of a turning radius of the cable.
In an embodiment of the present invention, the additional value of the turning radius of the cable is kD, where D is the diameter of the cable and k is the cable constant.
In an embodiment of the invention, the minimum radius of curvature is determined according to the escape speed of the person and the form of ventilation in the corridor turning structure.
In an embodiment of the present invention, in a state where the first end of the curved turning section is the ventilation inlet, a first radius of curvature of the outer curved corridor wall is greater than a first radius of curvature of the inner curved corridor wall; or, the second curvature radius of the outer side curve corridor wall is larger than the second curvature radius of the inner side curve corridor wall under the condition that the second end part of the curve turning section is a ventilation air inlet.
In an embodiment of the present invention, if the height of the curve turning section is H and the width of the curve turning section is B, there are: 0.5< B/H < 6.5.
In an embodiment of the present invention, two adjacent curve turning segments are connected by a spacing segment, where the length of the spacing segment is LS, and the width of the spacing segment is DS, then: 3< LS/DS < 5.
The invention also provides a comprehensive pipe gallery which comprises the pipe gallery turning structure.
The invention also provides a method for designing the combination curve of the pipe gallery turning structure, which is used for manufacturing the pipe gallery turning structure and comprises the following steps:
determining the line type of a combination curve of the pipe gallery turning structure according to the actual width of the pipe gallery turning structure, the ventilation form in the pipe gallery turning structure, the type of a maintenance carrier in the pipe gallery turning structure and whether a cable is arranged in the pipe gallery turning structure;
the combined curve comprises at least one turning curve, the turning curve comprises a turning inner boundary line and a turning outer boundary line, and the turning inner boundary line and the turning outer boundary line are provided with an inner concave circular curve, an outer convex circular curve and a straight line connected between the inner concave circular curve and the outer convex circular curve; wherein the concave circular curve has a first radius of curvature and the convex circular curve has a second radius of curvature.
In an embodiment of the invention, it is determined whether the first radius of curvature and the second radius of curvature need to meet the requirement of a minimum radius of curvature depending on the type of service carrier.
In an embodiment of the invention, the first radius of curvature and the second radius of curvature are required to meet the requirement of the minimum radius of curvature in a state where the service carrier is a person.
In an embodiment of the present invention, the first radius of curvature and the second radius of curvature need not satisfy the requirement of the minimum radius of curvature in a state where the inspection vehicle is an inspection robot.
In an embodiment of the invention, the minimum radius of curvature is determined according to the escape speed of the person and the form of ventilation within the corridor turning structure.
In an embodiment of the invention, the escape speed of the person is determined from the minimum centrifugal force when the person runs on a circular curve.
In an embodiment of the present invention, the first radius of curvature and the second radius of curvature are determined by the minimum radius of curvature and the additional value of the cable turning radius in a state where the cable is arranged within the conduit lane turning structure.
In an embodiment of the present invention, the additional value of the turning radius of the cable is kD, where D is the diameter of the cable and k is the cable constant.
In an embodiment of the invention, the ventilation of the pipe gallery is in the form of natural ventilation or mechanical ventilation.
In an embodiment of the present invention, in a state where the inspection vehicle is an inspection robot, a width between the turn inner boundary line and the turn outer boundary line is a width of the inspection robot.
The invention relates to a pipe gallery turning structure, a design method of a combination curve of the pipe gallery turning structure and a comprehensive pipe gallery, which have the characteristics and advantages that: the invention adopts the turning form of a combined curve consisting of two sections of circular curves and straight lines, and mainly solves the problem of adopting a 45-degree or other fixed-angle turning angle. Firstly, the invention is more beneficial to the passing of maintainers and maintenance equipment, so that the sight is smooth, the psychological pressure of the staff in the pipe gallery is reduced, the escape and the maintenance are facilitated, the unsmooth ventilation caused by the line shape is reduced, and the ventilation is facilitated; meanwhile, local external expansion of the pipe gallery main body caused by large-angle turning of the pipe gallery is reduced, and the utilization rate of an underground space is improved; in addition, the device can be used for locally avoiding underground existing pipelines or being combined with existing buildings at special positions, is more beneficial to keeping the line positions consistent with those of road engineering, is beneficial to the coordinated design of the road engineering and the road engineering, and avoids the phenomenon of local deviation of the line positions of the pipeline corridor; moreover, when arranging the cable in the piping lane, this piping lane break structure still can protect the cable, reduces the stress concentration of corner cable, extension cable life.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a pipe gallery turning structure of the present invention.
FIG. 2 is a graph of radius versus velocity.
FIG. 3 is a graph of verification of radius versus velocity.
FIG. 4 is a graph of the effect of aspect ratio of the curve transition on the local resistance coefficient.
FIG. 5 is a graph of the effect of pitch segments on local drag coefficients.
The reference numbers illustrate: 1. a curve turning section; 11. an inner curvilinear corridor wall; 111. a first corridor wall; 112. a second corridor wall; 113. a third corridor wall; 12. an outer curvilinear corridor wall; 121. a first corridor wall; 122. a second corridor wall; 123. a third corridor wall; r1, first radius of curvature; r2, second radius of curvature; 2. a spacing segment; 3. a first end portion; 4. a second end portion; LS, length; DS, width; 1', a turning curve; 11', a turning inner boundary line; 111', concave circular curve; 112', straight line; 113', convex circular curve; 12', a turning outer boundary line; 121', concave circular curve; 122', straight line; 123', convex circular curve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Implementation mode one
As shown in fig. 1, the present invention provides a pipe gallery turning structure, which includes at least one curved turning section 1, the curved turning section 1 having an inner curved gallery wall 11 and an outer curved gallery wall 12, the inner curved gallery wall 11 and the outer curved gallery wall 12 each including a first gallery wall 111 (or a first gallery wall 121), a second gallery wall 112 (or a second gallery wall 122), and a third gallery wall 113 (or a third gallery wall 123) connected in sequence, wherein: first corridor wall 111 (or first corridor wall 121) has a circular curve inner concave surface, second corridor wall 112 (or second corridor wall 122) has a straight line surface, third corridor wall 113 (or third corridor wall 123) has a circular curve outer convex surface, circular curve inner concave surface has a first radius of curvature R1, circular curve outer convex surface has a second radius of curvature R2.
This piping lane turn structure uses in city underground pipe gallery's book department, can make the piping lane design reduce the corner blind area when avoiding increasing the cost by a wide margin, guarantees personnel speed of fleing and piping lane ventilation effect, reaches the effect that guides sight, transition gently.
The inventor finds that: present piping lane is in turn position department, adopt 45 or other fixed angle's dog-ear to roll over usually, design and construction have been simplified to a certain extent to this kind of design, engineering cost has been reduced, but often can cause the blind area of piping lane fortune dimension expert personnel's vision, aggravation mental state's depression, when adopting 45 dog-ear forms simultaneously, the air current can directly collide with the corridor wall when the transmission, produce the unstability and vibrate, be unfavorable for the piping lane ventilation, and then can be to the inside ventilation of piping lane, the transportation of pipeline and personnel's evacuation flee and produce certain influence, certain drawback has.
The inner side curve corridor wall 11 and the outer side curve corridor wall 12 of the pipe corridor turning structure adopt the turning form of a combined curve consisting of two sections of circular curves and straight lines, and mainly solve the problem of adopting 45-degree or other fixed-angle turning angles. Firstly, the invention is more beneficial to the passing of maintainers and maintenance equipment, so that the sight is smooth, the psychological pressure of the staff in the pipe gallery is reduced, the escape and the maintenance are facilitated, the unsmooth ventilation caused by the line shape is reduced, and the ventilation is facilitated; meanwhile, local external expansion of the pipe gallery main body caused by large-angle turning of the pipe gallery is reduced, and the utilization rate of an underground space is improved; in addition, the device can be used for locally avoiding underground existing pipelines or being combined with existing buildings at special positions, is more beneficial to keeping the line positions consistent with those of road engineering, is beneficial to the coordinated design of the road engineering and the road engineering, and avoids the phenomenon of local deviation of the line positions of the pipeline corridor; moreover, when arranging the cable in the piping lane, this piping lane break structure still can protect the cable, reduces the stress concentration of corner cable, extension cable life.
Specifically, the boundary line of the inside curved corridor wall 11 and the boundary line of the outside curved corridor wall 12 are determined according to the turning requirement of the pipe corridor and the site conditions, for example, because the pipe corridor is usually set below a road green belt or a sidewalk along with the road construction, and the line shape is consistent with the line of the road, the pipe corridor needs to be adjusted along with the line position at the turning and widening part of the road, that is, the boundary line of the inside curved corridor wall 11 and the boundary line of the outside curved corridor wall 12 are determined.
In the embodiment of the present invention, the width b between the second gallery wall 112 of the inner curved gallery wall 11 and the second gallery wall 122 of the outer curved gallery wall 12 is smaller than the width b1 between the first gallery wall 111 of the inner curved gallery wall 11 and the first gallery wall 121 of the outer curved gallery wall 12, and is smaller than the width b2 between the third gallery wall 113 of the inner curved gallery wall 11 and the third gallery wall 123 of the outer curved gallery wall 12. That is, in a curve turning section 1, the value of the width b is minimum, and by adopting the design structure, the design construction cost can be reduced on the premise of ensuring smooth traffic.
In the present embodiment, the width b between the second gallery wall 112 of the inner curved gallery wall 11 and the second gallery wall 122 of the outer curved gallery wall 12 is greater than or equal to 1 m. This width b needs to satisfy the basic work and traffic requirements of personnel or inspection robots, see table 1 for specific requirements:
TABLE 1
According to an embodiment of the present invention, in a state where the cable is laid on the inner curved corridor wall 11 of the curved turning section 1, the first curvature radius R1 of the circular-curved inner concave surface of the inner curved corridor wall 11 and the second curvature radius R2 of the circular-curved outer convex surface of the inner curved corridor wall 11 are the sum of the minimum curvature radius and the cable-turning radius additional value a.
Further, in a state where the cable is laid on the outer curved corridor wall 12 of the curved turning section, the first curvature radius R1 of the circular curved inner concave surface of the outer curved corridor wall 12 and the second curvature radius R2 of the circular curved outer convex surface of the outer curved corridor wall 12 are the sum of the minimum curvature radius and the cable turning radius additional value a.
The additional value A of the turning radius of the cable is kD, wherein D is the diameter of the cable, and k is a cable constant. It is noted herein that the cable is generally referred to as a power cable or a communication cable.
The inventor finds that: the cables in the pipe gallery are laid side by side, and certain natural bending can be formed after the cables are laid. Therefore, in order to ensure the turning radius requirements of all cables in the pipe gallery, the invention provides a cable turning radius additional value A based on the fact that the parameter values of the cable turning radius additional value A are shown in the table 2:
TABLE 2
| Cable type | Added value of turning radius A |
| 10kv | 3D |
| 110kv | 1D |
| Optical cable | 4D |
The requirement of radius of all cables in the pipe rack is guaranteed by the additional value A of the turning radius of the cable, and the requirement of the cable in the pipe rack on the minimum curvature radius of the turning is obtained under different materials, as shown in table 3:
TABLE 3
In the present invention, the above-mentioned minimum radius of curvature is determined according to the escape speed of a person and the ventilation pattern in the pipe gallery turning structure.
The inventor finds that: the turn of pipe gallery is the main loss department of pipe gallery ventilation, and the ventilation loss of turn department is often not considered in current pipe gallery design, and such design result often has the inequality or economic nature.
To address this problem, the present invention's ventilation pattern of a duct lane break location, determined by the cable capacity within the duct lane and whether 110kv cables are present, changes the current duct lane design approach to the traditional lay-out of the ventilation design. The ventilation pattern is shown in table 4:
TABLE 4
Wherein, the natural ventilation means the natural air intake mechanical air exhaust; mechanical ventilation refers to mechanical air intake and mechanical air exhaust.
In addition, depending on the type of service carrier in the pipe lane, a first radius of curvature R1, and a second radius of curvature R2 are determined, whether the minimum radius of curvature requirement needs to be met.
Specifically, for a pipe gallery which only adopts an overhauling robot, the requirement of minimum curvature radius for escape of personnel can be not considered; for the pipe gallery which adopts inspectors or gives consideration to the passing requirements of people such as civil air defense, the requirement of minimum curvature radius for escape of people must be met.
According to the specification requirements of 'urban comprehensive pipe gallery engineering technical specification GB 50838-2015', the escape distance of a cabin for laying a power cable is not more than 200 m. The inventor finds that: when a fire disaster occurs in the pipe gallery, the fire disaster scale is 20MW, and under the condition of adopting natural ventilation, smoke caused by the fire disaster fills the top of the pipe gallery in about 67s to reach the escape limit value; with mechanical ventilation, the delay caused by a fire fills the top of the pipe gallery in about 80 seconds. Therefore, when natural ventilation is adopted, the minimum escape speed of personnel in the pipe gallery is 1.5 m/s; when mechanical ventilation is adopted, the minimum escape speed of people in the pipe gallery is 1.25 m/s.
In addition, the inventors have also found that: the normal running speed of an adult is 5.5m/s, and based on the speed, the experiment allows the experimenter to pass through circular curves with different radii at the same speed of 5.5m/s, thereby obtaining a graph of the radius R (m) and the speed (m/s) of the passing curve, as shown in FIG. 2.
Looking at the test data of fig. 2, at a curve radius R of 36m, there is a significant change in the trend of the data, with the speed through the curve increasing as the radius continues to increase, but not significantly; when the radius is less than 36m, the speed through the curve decreases significantly and the effect of the curve on running speed increases significantly. From this analysis, it can be seen that when the radius of the curve is 36m, the centrifugal force generated when running on the curve is small, ensuring that the runner does not significantly brake.
Formula F ═ mv according to centrifugal force2R, radius R and speed V under the premise of same mass2Proportional, and it is reasonable to infer that the curve radius is proportional to the square of the velocity through the curve: r ═ f (V)2)；
Further, when F takes a value of 5.88 (minimum centrifugal force), then there is
Wherein R: a minimum radius of curvature; v: speed; m: the quality of the person.
Therefore, when the minimum escape speed in the pipe gallery is 1.3m/s, the formula R is f (V)2) A minimum radius of curvature R of 2.0m is obtained. Table 5 minimum radius of curvature requirement for personnel escape:
TABLE 5
| Speed of rotation | Minimum radius of curvature R value |
| Suitable escape speed is 2.0m/s | 4.8m |
| The lowest escape speed of natural ventilation is 1.5m/s | 2.7m |
| Mechanical ventilation minimum escape speed of 1.3m/s | 2.0m |
Therefore, in order to ensure that the personnel can escape smoothly under the worst adverse conditions, the escape passage of the pipe gallery must be smooth and unimpeded.
In addition, the present invention allows the same experimenter to pass through circular curves of different radii at a speed of 1.3m/s and measure the corresponding circular curve passing speed, as shown in FIG. 3: the experimental result proves an inference formula, and the minimum curvature radius requirement for escape of the design personnel of the pipe gallery turning adopting the combined curve is calculated.
The design index recommends that the escape speed of 2.0m/s is guaranteed for curve design, and when the condition is limited, the minimum guaranteed speed of the curve for natural ventilation is 1.5 m/s; for a pipe gallery folding with mechanical ventilation, the curve minimum guaranteed speed is 1.3 m/s.
According to an embodiment of the present invention, in a state where the first end 3 of the curved turning section 1 is the ventilation inlet, the first radius of curvature R1 of the outer curved corridor wall 12 is greater than the first radius of curvature R1 of the inner curved corridor wall 11; alternatively, in a state where the second end 4 of the curved turning section 1 is the ventilation inlet, the second radius of curvature R2 of the outer curved corridor wall is greater than the second radius of curvature R2 of the inner curved corridor wall 11. Adopt this kind of design to increase income wind gap gas volume, reduce because the air current can be directly when the transmission with the corridor side wall collision of piping lane cause energy loss.
According to an embodiment of the present invention, when the height of the curve transition 1 is H and the width of the curve transition 1 is B, there are: 0.5< B/H < 6.5.
Specifically, the inventor calculates the same air volume (for example, 8600) by simulationm3H) and the same curvature radius (for example, 1D), the local resistance coefficient of the curve turning structure under different aspect ratio conditions changes, and the curve of fig. 4 is obtained. As analyzed in fig. 4, in order to ensure the ventilation requirement inside the pipe gallery, the local resistance coefficient of ventilation at the folding part of the pipe gallery should be less than 0.18, so the present invention designs the width-to-height ratio B/H of the curved turning section 1 to be less than 6.5, and at the same time, further limits the width-to-height ratio B/H to be more than 0.5 in consideration of the overturn resistance of the pipe gallery structure and the minimum size requirement of the structure.
According to one embodiment of the present invention, as shown in fig. 1, two adjacent curve turning sections 1 are connected by a spacing section 2, the length of the spacing section 2 is LS, the width of the spacing section 2 is DS, and then: 3< LS/DS < 5.
When the pipe gallery turning structure is composed of more than two curve turning sections 1, the adjacent two curve turning sections 1 can generate mutual influence to form an interference effect. Through the analog calculation of the local resistance coefficients of two curve transitions 1 at different pitches (as shown in fig. 5), the pitch LS needs to be checked for the composition structure of more than two curve transitions 1 during the design.
When the ratio of the local resistance coefficient of the pipe gallery turning structure formed by combining the two groups of curve turning sections 1 is less than LS/DS <5, and when the ratio of LS/DS <3 or LS/DS >5, the local resistance coefficient of the pipe gallery turning structure formed by combining the two groups of curve turning sections 1 is obviously greater, and the curve combination parameters need to be readjusted to meet the requirements.
Second embodiment
As shown in fig. 1 to 5, the present invention further provides a utility tunnel, which includes the pipe gallery turning structure described in the first embodiment. The specific structure and the beneficial effects of the pipe gallery turning structure are the same as those described in the first embodiment, and are not described again here.
Third embodiment
As shown in fig. 1 to 5, the present invention further provides a method for designing a combination curve of a tube lane turning structure, which is used to manufacture the tube lane turning structure in the first embodiment, and the specific structure and the beneficial effects of the tube lane turning structure are the same as those described in the first embodiment, and are not repeated herein. The method comprises the following steps:
determining the line type of a combination curve of the pipe gallery turning structure according to the actual width of the pipe gallery turning structure, the ventilation form in the pipe gallery turning structure, the type of a maintenance carrier in the pipe gallery turning structure and whether a cable is arranged in the pipe gallery turning structure;
wherein the combined curve includes at least one turning curve 1 ', the turning curve 1' includes a turning inner boundary line 11 'and a turning outer boundary line 12', the turning inner boundary line 11 'and the turning outer boundary line 12' each have an inner concave circular curve 111 '(or an inner concave circular curve 121'), an outer convex circular curve 113 '(or an outer convex circular curve 123'), and a straight line 112 '(or a straight line 122') connecting between the inner concave circular curve 111 '(or the inner concave circular curve 121') and the outer convex circular curve 113 '(or the outer convex circular curve 123'); wherein the inner concave circular curve 111 '(or the inner concave circular curve 121') has a first radius of curvature R1, and the outer convex circular curve 113 '(or the outer convex circular curve 123') has a second radius of curvature R2.
Through the combination curve design method of this piping lane turn structure, the piping lane turn structure of manufacturing can make the piping lane design reduce the corner blind area when avoiding increasing the cost by a wide margin, guarantees personnel's escape speed and piping lane ventilation effect, reaches the effect that guides sight, transition gently.
The combined curve design method firstly needs to determine whether the first curvature radius R1 and the second curvature radius R2 need to meet the requirement of the minimum curvature radius according to the type of the overhaul carrier.
In one embodiment, the first radius of curvature R1 and the second radius of curvature R2 are required to meet the minimum radius of curvature requirement when the service carrier is a person.
In another embodiment, the first radius of curvature R1 and the second radius of curvature R2 need not meet the minimum radius of curvature requirement in the state where the service carrier is an inspection robot.
Specifically, in this embodiment, the width b between the straight line 112 'of the turning inner boundary line 11' and the straight line 122 'of the turning outer boundary line 12' is smaller than the width b1 between the inner concave curve 111 'of the turning inner boundary line 11' and the inner concave curve 121 'of the turning outer boundary line 12', and is smaller than the width b2 between the outer convex curve 113 'of the turning inner boundary line 11' and the outer convex curve 123 'of the turning outer boundary line 12'. That is, in a turning curve 1', the value of width b is minimum, adopts this design structure, can reduce design construction cost under the smooth current prerequisite of the pipe gallery turning structure that guarantees to design. In the present embodiment, the width b between the turning inner boundary line 11 'and the turning outer boundary line 12' may be the width of the inspection robot.
In the present invention, the minimum radius of curvature is determined according to the escape speed of the person and the form of ventilation in the pipe gallery turning structure.
According to the specification requirements of 'urban comprehensive pipe gallery engineering technical specification GB 50838-2015', the escape distance of a cabin for laying a power cable is not more than 200 m. The inventor finds that: when a fire disaster occurs in the pipe gallery, the fire disaster scale is 20MW, and under the condition of adopting natural ventilation, smoke caused by the fire disaster fills the top of the pipe gallery in about 67s to reach the escape limit value; with mechanical ventilation, the delay caused by a fire fills the top of the pipe gallery in about 80 seconds. Therefore, when natural ventilation is adopted, the minimum escape speed of personnel in the pipe gallery is 1.5 m/s; when mechanical ventilation is adopted, the minimum escape speed of people in the pipe gallery is 1.25 m/s.
In addition, the inventors have also found that: the normal running speed of an adult is 5.5m/s, and based on the speed, the experiment allows the experimenter to pass through circular curves with different radii at the same speed of 5.5m/s, thereby obtaining a graph of the radius R (m) and the speed (m/s) of the passing curve, as shown in FIG. 2.
Looking at the test data of fig. 2, at a curve radius R of 36m, there is a significant change in the trend of the data, with the speed through the curve increasing as the radius continues to increase, but not significantly; when the radius is less than 36m, the speed through the curve decreases significantly and the effect of the curve on running speed increases significantly. From this analysis, it can be seen that when the radius of the curve is 36m, the departure generated when running on the curveLess cardiac force ensures that the runner does not significantly brake. Formula F ═ mv according to centrifugal force2The radius R and the speed V can be obtained on the premise of the same mass2Proportional, and it is reasonable to infer that the curve radius is proportional to the square of the velocity through the curve: r ═ f (V)2). That is, the escape speed of the person is determined according to the minimum centrifugal force when the person runs on the circular curve.
In addition, the ventilation mode in the pipe gallery turning structure can be natural ventilation or mechanical ventilation.
The first radius of curvature R1 and the second radius of curvature R2 of the combined curve in the state of the cable arranged within the lane-break structure are determined by the minimum radius of curvature and the additional value a of the cable turning radius.
The additional value A of the turning radius of the cable is kD, wherein D is the diameter of the cable, and k is a cable constant.
The design method of the combined curve provided by the invention avoids the randomness of the design of the combined curve, and the factors of ventilation, escape, safety, structure and the like of the pipe gallery are fully considered in the value taking of each step and parameter, thereby embodying the scientificity of the design.
According to the method for designing the combined curve, after the combined line shape is preliminarily simulated, the line shape needs to be checked, whether the combined line shape meets the site condition limitation, the turning requirement, the minimum curvature radius requirement, the pipe gallery width requirement and the ventilation loss is in a reasonable interval is checked, and otherwise, the combined line shape needs to be redesigned. In addition, the combined curve needs to meet the limitation of a field, the radius is too large and exceeds the range of the field, so that the manufacturing cost is wasted, and the radius is too small and the turning is too small, so that the minimum distance between turning and avoiding obstacles or other requirements cannot be met. By the design method provided by the invention, the scientification and rationalization of the turning design of the combined curve of the pipe gallery are realized, and the current situation of the extensive design of the turning part of the pipe gallery is changed.
The above description is only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.
Claims (21)
1. The utility model provides a piping lane turn structure, a serial communication port, piping lane turn structure includes at least one curve turn section, curve turn section has inboard curve corridor wall and outside curve corridor wall, inboard curve corridor wall with outside curve corridor wall all includes the first corridor wall, second corridor wall and the third corridor wall that connect gradually, wherein:
the first gallery wall has a round-curved inner concave surface, the second gallery wall has a linear surface, the third gallery wall has a round-curved outer convex surface, the round-curved inner concave surface has a first radius of curvature, and the round-curved outer convex surface has a second radius of curvature.
2. The piping lane turning structure of claim 1, wherein a width between the second gallery wall of the inner curvilinear gallery wall and the second gallery wall of the outer curvilinear gallery wall is less than a width between the first gallery wall of the inner curvilinear gallery wall and the first gallery wall of the outer curvilinear gallery wall, and is less than a width between the third gallery wall of the inner curvilinear gallery wall and the third gallery wall of the outer curvilinear gallery wall.
3. A tube lane break structure according to claim 1 or 2, wherein the width between the second gallery wall of the inner curvilinear gallery wall and the second gallery wall of the outer curvilinear gallery wall is greater than or equal to 1 m.
4. The piping lane transition structure of claim 1, wherein in a state where a cable is laid on the inside curved corridor wall of the curved transition section, the first radius of curvature of the circular curved inner concave surface of the inside curved corridor wall and the second radius of curvature of the circular curved outer convex surface of the inside curved corridor wall are the sum of the minimum radius of curvature and the added value of the turning radius of the cable.
5. The piping lane turning structure of claim 1, wherein in a state where a cable is laid on the outside curved corridor wall of the curved turning section, the first radius of curvature of the circular curved inner concave surface of the outside curved corridor wall and the second radius of curvature of the circular curved outer convex surface of the outside curved corridor wall are the sum of the minimum radius of curvature and the added value of the turning radius of the cable.
6. A tube lane break structure according to claim 4 or 5, wherein the cable turn radius added value is kD, where D is the diameter of the cable and k is the cable constant.
7. A tube lane break structure according to claim 4 or 5, characterized in that said minimum radius of curvature is determined according to the escape speed of the person and the form of ventilation in the tube lane break structure.
8. The tube lane transition structure of claim 1, wherein the first radius of curvature of the outer curvilinear lane wall is greater than the first radius of curvature of the inner curvilinear lane wall in a state where the first end of the curvilinear transition section is a vent air inlet; or, the second curvature radius of the outer side curve corridor wall is larger than the second curvature radius of the inner side curve corridor wall under the condition that the second end part of the curve turning section is a ventilation air inlet.
9. A tube lane break structure according to claim 1, wherein the height of said curved break is H and the width of said curved break is B, then: 0.5< B/H < 6.5.
10. The tube lane turning structure of claim 1, wherein two adjacent curved turning sections are connected by a spacing section, the length of the spacing section is LS, the width of the spacing section is DS, then: 3< LS/DS < 5.
11. A utility tunnel comprising a tunnel turning structure according to any one of claims 1 to 10.
12. A method for designing a combined curve of a pipe gallery turning structure for manufacturing the pipe gallery turning structure according to any one of claims 1 to 10, comprising the steps of:
determining the line type of a combination curve of the pipe gallery turning structure according to the actual width of the pipe gallery turning structure, the ventilation form in the pipe gallery turning structure, the type of a maintenance carrier in the pipe gallery turning structure and whether a cable is arranged in the pipe gallery turning structure;
the combined curve comprises at least one turning curve, the turning curve comprises a turning inner boundary line and a turning outer boundary line, and the turning inner boundary line and the turning outer boundary line are provided with an inner concave circular curve, an outer convex circular curve and a straight line connected between the inner concave circular curve and the outer convex circular curve; wherein the concave circular curve has a first radius of curvature and the convex circular curve has a second radius of curvature.
13. A method of designing a compound curve of a pipe gallery turning structure according to claim 12, wherein it is determined whether the first radius of curvature and the second radius of curvature are required to meet the minimum radius of curvature in accordance with the type of service carrier.
14. The method of claim 13, wherein said first radius of curvature and said second radius of curvature are required to meet said minimum radius of curvature in a condition where said service carrier is personnel.
15. The method of claim 13, wherein the first radius of curvature and the second radius of curvature do not need to meet the minimum radius of curvature requirement in a state where the service carrier is an inspection robot.
16. A method of designing a compound curve of a pipe corridor turning structure according to claim 14, characterised in that the minimum radius of curvature is determined according to the escape speed of the person and the form of ventilation in the pipe corridor turning structure.
17. A method of designing a compound curve of a pipe corridor turning structure according to claim 16, c h a r a c t e r i z e d in that the escape speed of the person is determined according to the minimum centrifugal force when the person runs on the circular curve.
18. The method of claim 13, wherein said first radius of curvature and said second radius of curvature are determined by said minimum radius of curvature and cable turn radius additional values in a state where a cable is disposed within said tube lane break structure.
19. The method of claim 18, wherein the cable turn radius added value is kD, where D is the diameter of the cable and k is the cable constant.
20. A method of designing a compound curve of a pipe rack turning structure according to claim 12, characterized in that the ventilation of the pipe rack is in the form of natural ventilation or mechanical ventilation.
21. The method for designing a combination curve of a pipe gallery turning structure according to claim 13, wherein a width between the inner boundary line of the turn and the outer boundary line of the turn is a width of an inspection robot in a state where the inspection vehicle is the inspection robot.
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