CN110093822B - Heavy-load vehicle passing crossing plate for underground coal conveying shallow-buried corridor of thermal power plant and design method thereof - Google Patents
Heavy-load vehicle passing crossing plate for underground coal conveying shallow-buried corridor of thermal power plant and design method thereof Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
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- E01C5/00—Pavings made of prefabricated single units
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- E01C5/08—Reinforced units with steel frames
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- E—FIXED CONSTRUCTIONS
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
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Abstract
The invention relates to a heavy-load vehicle passing crossing plate for a underground coal conveying shallow-buried corridor of a thermal power plant and a design method thereof, which solve the defect that the heavy-load vehicle damages the shallow-buried corridor by passing over the shallow-buried corridor in comparison with the prior art. The bearing crossing plate comprises a left supporting foundation beam, a top plate and a right supporting foundation beam, wherein the top plate is a reinforced concrete unidirectional stressed plate, the left supporting foundation beam and the right supporting foundation beam are respectively arranged on two sides of the top plate, the left supporting foundation beam and the right supporting foundation beam are respectively arranged on two reinforced foundations through cushion layers, the lower surface of the top plate is of a concave structure, the elevation of the lower surface of the top plate is higher than the elevation of the upper surface of a shallow buried corridor, and a cavity is arranged between the lower surface of the top plate and the upper surface of the shallow buried corridor. The invention avoids the damage of the pressure of the heavy-duty truck to the existing shallow gallery structure, and simultaneously avoids the influence of the traditional gallery structure reinforcement mode on the operation of the gallery.
Description
Technical Field
The invention relates to the technical field of thermal power plants, in particular to a heavy-load vehicle passing crossing plate for a underground coal conveying shallow-buried corridor of a thermal power plant and a design method thereof.
Background
Along with the enhancement of environmental protection and the great development of energy conservation and emission reduction in China, the emission control of dust is increasingly emphasized, a series of dust-proof closed reconstruction projects of the open-air coal yard of the thermal power plant are formed, and the project of closed reconstruction of the coal yard is generally accompanied by the re-planning of regional roads of the coal yard.
In general, an underground coal conveying corridor is arranged near a coal yard area, and a coal yard area road is mostly used for passing heavy-load coal conveying vehicles, and it may occur that a plant road on which the heavy-load coal conveying vehicles are re-planned travel needs to pass above the underground coal conveying corridor (shallow coal conveying corridor). Because the built shallow-buried corridor has shallow buried depth and the original design does not consider the load of heavy-load vehicle traffic, potential safety hazards exist on the top surface and the side wall of the shallow-buried corridor when the heavy-load vehicle traffic is carried out, and the partial engineering proved to exceed the bearing capacity limit and the normal use limit of the structure, if the reinforcement construction is adopted to directly reinforce the corridor under the road, the reinforcement construction can lead to long-time operation interruption of the underground corridor, and the construction has higher cost and poorer reliability. In addition, there is also a large difference in the (self) weight of the vehicles involved in passing heavy loads for coal yards of different sizes, so that reinforcement on shallow galleries is not a simple addition or release of the tie plates.
Therefore, how to develop a crossing plate for heavy-duty vehicle traffic and a design method thereof have become a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to solve the defect that a heavy-duty vehicle damages a shallow-buried corridor through the upper part of the shallow-buried corridor in the prior art, and provides a heavy-duty vehicle passing crossing plate for a underground coal conveying shallow-buried corridor of a thermal power plant and a design method thereof to solve the problems.
In order to achieve the above object, the technical scheme of the present invention is as follows:
the heavy-load vehicle passing spanning plate comprises a shallow-buried corridor and a bearing spanning plate, wherein reinforced foundations are arranged outside the side walls of two sides of the shallow-buried corridor, the bearing spanning plate is arranged on the two reinforced foundations, the top of the bearing spanning plate exceeds the ground, and the lower surface of the bearing spanning plate is shaped like a Chinese character 'ji';
the bearing crossing plate comprises a left supporting foundation beam, a top plate and a right supporting foundation beam, wherein the top plate is a reinforced concrete unidirectional stressed plate, the left supporting foundation beam and the right supporting foundation beam are respectively arranged on two sides of the top plate, the left supporting foundation beam and the right supporting foundation beam are respectively arranged on two reinforced foundations through cushion layers, the lower surface of the top plate is of a concave structure, the elevation of the lower surface of the top plate is higher than that of the upper surface of the shallow buried corridor, and a cavity is arranged between the lower surface of the top plate and the upper surface of the shallow buried corridor.
And the outer filling soil of the side walls of the two sides of the shallow buried corridor is compacted to strengthen the foundation.
And the outer filling soil of the side walls of the two sides of the shallow buried corridor is changed into sand filling stones for natural slope-placing treatment to form a reinforced foundation.
The left supporting foundation beam, the top plate and the right supporting foundation beam are of reinforced concrete integral pouring structures.
And a ramp is arranged between the upper surface of the left support foundation beam and the ground.
A design method of a heavy-load vehicle passing crossing plate for a underground coal conveying shallow-buried corridor of a thermal power plant comprises the following steps:
stress transfer analysis of heavy-duty vehicle tire downforce: analyzing the stress transmission process of the load-bearing spanning plate and the additional stress of the side walls at the two sides of the shallow gallery according to the downward pressure of the heavy-load vehicle tire to the load-bearing spanning plate;
and (3) carrying out design of a bearing spanning plate: and designing a bearing spanning plate and strengthening the foundation size according to the size of the shallow gallery.
The stress transfer analysis of the heavy-duty vehicle tire down force comprises the following steps:
tire wheel pressure calculation parameter setting, namely setting heavy-duty vehicle wheel pressure P (kN);
setting upThe wheel pressure P of the vehicle is transmitted to the top plate in a concentrated way through wheels, the concentrated load P of the wheel pressure is uniformly distributed on the top plate within the range of b (m) in width and a (m) in length, and the concentrated load P is equivalent to the uniformly distributed load q0 (kP) of each meter of plate belt acting on the top plate a M), calculating the direction of the equivalent plate belt perpendicular to the span of the top plate,
the calculation method of the wheel pressure distribution range parameters a and b is as follows:
the value of the distribution width b along the span direction of the top plate: b=b 1 ，
The value of the distribution width a in the span direction of the vertical top plate:
when the wheel acts on the middle part of the span of the plate,
a=a when the wheel acts on the support of the plate 1 +h，
Wherein a is 1 (m)、b 1 (m) is the wheel footprint dimension perpendicular to the roof span and parallel to the span direction; l (m) and h (m) are calculated spans of the roof and the thickness of the roof, wherein l depends on the actual width B (m) of the shallow buried corridor, l=b+3 is taken when the width B of the underground corridor is less than or equal to 6m, l=b+4 is taken when the width B of the underground corridor is less than or equal to 6m and less than or equal to 10m, and the thickness of the roof is equal to or less than the actual width B (m)The top plate is positioned along the span direction and aligned with the center of the width direction of the shallow buried corridor below;
uniformly distributed load q acting on each meter of strip width of top plate 0 The left support foundation beam and the right support foundation beam are transmitted to generate strip-shaped uniform load p on the top surface of the reinforced foundation 0 (kP a /m)，
C (m) is the section width of the left supporting foundation beam and the right supporting foundation beam, c=2 is taken when the underground corridor width B is less than or equal to 6m, c=3 is taken when the underground corridor width is more than 6 and less than or equal to 10m, and N is the number of wheels simultaneously acting on the top plate 4;
shallow buried corridor sidewall horizontal additional stress sigma x The parameter settings are calculated and the parameters are set,
bar-shaped uniform load p 0 The horizontal distance between the uniformly distributed load midpoint and the shallow gallery side wall is x (m), the vertical distance from the bottom surface of the left support foundation beam or the right support foundation beam to any height A point of the gallery side wall is z (m), and the bar-shaped uniformly distributed load p acts on the top surface of the reinforced foundation 0 Acting to transfer horizontal additional stresses sigma downward through the reinforced foundation x ；
Bar-shaped uniform load p 0 Horizontal additional stress sigma generated at arbitrary height A of gallery sidewall x The calculation formula is as follows:
wherein,as the depth of the point A changes, z, becomes deeper, sigma x Gradually decreasing.
The design of the load-bearing spanning plate comprises the following steps:
setting A s 、A' s The method for designing the reinforcing bars of each meter of plate strip in the span direction of the top plate comprises the following steps of:
α 1 f c bx＝f y A s -f' y A' s ，
wherein M is q 0 Calculating a bending moment design value under the action of the maximum midspan; f (f) c The concrete axle center compressive strength design value is specific value according to the concreteQuerying relevant specifications of the intensity level to obtain; alpha 1 As a factor, alpha when the strength grade of the concrete is not more than C50 1 =1.0; b is the calculated plate band width 1m; a' s A is the distance from the resultant force point of the longitudinal steel bars at the top to the top surface of the top plate s Distance from resultant force point of bottom longitudinal steel bar to bottom surface of top plate: a when longitudinal steel bars are arranged in a row s ＝a' s =0.045, a when the longitudinal bars are arranged in two rows s ＝a' s ＝0.07；h 0 ＝h-a s ；
Setting reinforcement bars perpendicular to the radial direction of the plate, and constructing and setting the reinforcement bars according to the reinforcement bar spacing of 200mm with the diameter of 20;
the left supporting foundation beam and the right supporting foundation beam are used as bearing spanning plates to be connected with the reinforced foundation, the foundation beams are designed according to rigid bodies, the shallow burying mode is adopted, the burying depth is 1m, the height of the foundation beams is 0.3m higher than the height of the ground, and the section height H=1+0.3, namely 1.3m; the steel bars at the top and the bottom of the foundation beam are arranged according to a steel bar spacing 150mm structure with the diameter of 20, and the stirrups are arranged according to a steel bar spacing 200mm structure with the diameter of 12;
the method for designing the reinforced foundation comprises the following steps:
setting a reinforced foundation calculation parameter, wherein the depth of the reinforced foundation is Z, and the bearing capacity strength of the reinforced foundation is f a The bearing capacity strength of the original soil before strengthening is f ab ：
Strengthen the bearing capacity strength f of foundation a The method meets the following conditions: p is p 0 ≤f a ；
Strength f of bearing force of original soil before strengthening ab The method meets the following conditions:
advantageous effects
Compared with the prior art, the heavy-load vehicle passing crossing plate for the underground coal conveying shallow-buried corridor of the thermal power plant and the design method thereof avoid the damage of the pressure of the heavy-load vehicle to the existing shallow-buried corridor structure and the influence of the traditional corridor structure reinforcement mode on the corridor operation; by the design method, the spanning plates with different specifications can be designed for the heavy-duty vehicles with different specifications, and the passing safety of the heavy-duty vehicles is further ensured.
When a heavy-duty vehicle needs to span the shallow-buried corridor, the vehicle load can be dispersed and transferred to foundations on two sides of the corridor through the spanning plate, so that the corridor roof is prevented from directly bearing the vehicle load. The corridor structure is not required to be reinforced, meanwhile, the passing requirement of heavy-duty vehicles is met, the crossing plate is in a shallow burying mode, the normal use of the underground corridor is not affected by construction, the continuous operation of a power plant is guaranteed, the engineering quantity is saved, the construction period is shortened, the engineering progress is greatly increased, and the method has high economic value.
Drawings
FIG. 1 is a top plan view of the structure of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a diagram of a design analysis of the design method of the present invention;
wherein, 1-bearing spanning plate, 2-left supporting foundation beam, 3-right supporting foundation beam, 4-top plate, 5-shallow gallery, 6-reinforced foundation, 7-cushion layer, 8-ramp and 9-cavity.
Detailed Description
For a further understanding and appreciation of the structural features and advantages achieved by the present invention, the following description is provided in connection with the accompanying drawings, which are presently preferred embodiments and are incorporated in the accompanying drawings, in which:
as shown in fig. 1 and 2, the heavy vehicle passing crossing plate for the underground coal conveying shallow-buried corridor of the thermal power plant comprises a shallow-buried corridor 5, the original design of the built corridor is shallow in embedding depth, heavy vehicle passing load is not considered, when the load of the heavy vehicle directly acts on the covering soil of the top surface of the corridor, the ultimate bearing capacity of the top plate and the side wall of the corridor cannot meet the newly added load function through calculation, for example, a mode of directly reinforcing the corridor is adopted, reinforcing construction cost is high, reliability is poor, and long-time operation interruption of the underground corridor can be caused.
Based on this, a load-bearing spanning plate 1 is designed. The outside of the side walls of the two sides of the shallow gallery 5 are respectively provided with a reinforced foundation 6, and the bearing spanning plate 1 is arranged on the two reinforced foundations 6. The reinforced foundations 6 on two sides serve as a foundation system of the whole crossing plate 1, are shallowly buried on the reinforced foundations 6 on two sides of the shallow buried corridor 5, the reinforced foundations 6 are positioned below supporting foundation beams (the left supporting foundation beam 2 and the right supporting foundation beam 3), and because the two sides of the original shallow buried corridor 5 are backfilled soil, in order to prevent larger settlement of the crossing plate 1, the main stress layer of the foundation is required to be subjected to backfill treatment, after the backfill treatment, foundation reaction force can be dissipated more quickly, and the pressure of additional stress on the side wall of the original shallow buried corridor 5 can be smaller.
The top of the bearing spanning plate 1 exceeds the ground, the lower surface of the bearing spanning plate 1 is in a shape like a Chinese character 'ji', namely, the top plate 4 of the bearing spanning plate 1 is arranged above the shallow-buried corridor 5 and is in a void state with the top surface of the shallow-buried corridor 5, and the void design can ensure that the load of the heavy-duty truck can not act on the top plate of the shallow-buried corridor 5 at all, so that the purposes of dispersing the stress of the heavy-duty truck and protecting the shallow-buried corridor 5 through the spanning plate are realized.
As shown in fig. 2, the load-bearing spanning plate 1 comprises a left supporting foundation beam 2, a top plate 4 and a right supporting foundation beam 3, wherein the top plate 4 is a reinforced concrete unidirectional stressed plate, the left supporting foundation beam 2 and the right supporting foundation beam 3 are respectively arranged on two sides of the top plate 4, and can be of an integral pouring structure, so that the negative bending moment of the end part of the top plate 4 is reduced, the engineering quantity of the top plate 4 is reduced, and the engineering cost is reduced. The left support foundation beam 2 and the right support foundation beam 3 are respectively installed on the two reinforced foundations 6 through cushion layers 7, the lower surface of the top plate 4 is of a concave structure, the elevation of the lower surface of the top plate 4 is higher than the elevation of the upper surface of the shallow buried corridor 5, and a cavity 9 is arranged between the lower surface of the top plate 4 and the upper surface of the shallow buried corridor 5.
The outside of the two side walls of the shallow buried corridor 5 can be compacted into a reinforced foundation 6, or the outside of the two side walls of the shallow buried corridor 5 can be replaced by sand and gravel for natural slope-releasing treatment into the reinforced foundation 6. Meanwhile, in order to facilitate the passage of the truck, a ramp 8 may be further provided between the upper surface of the left supporting foundation beam 2 (right supporting foundation beam 3) and the ground.
In actual use, the arrangement of the bearing spanning plate 1 can reasonably transfer the vehicle load, transfer and convert the concentrated load which is originally directly acted on the top surface of the shallow buried corridor 5 into the uniform surface load which is acted on the outer side wall of the shallow buried corridor 5, act on the reinforced foundation 6, and transfer downwards in a dispersed manner again through the reinforced foundation 6, and finally only form a smaller horizontal side pressure on the side wall of the shallow buried corridor 5. In the load transmission process, the concentrated load of the wheel pressure of the vehicle is converted into uniform surface load, the process realizes the first dispersion of concentrated heavy load, the uniform surface load is downwards transmitted in the reinforced foundation 6 for further stress diffusion, the diffusion is carried out to the depth of embedding the shallow gallery 5 to generate horizontal side stress on the side wall, and the process realizes the second dispersion of the load.
Here, in order to cope with heavy vehicles of different specifications, the spanning plates of different specifications can be designed, so that the traffic safety of the heavy vehicles is further ensured, and as shown in fig. 3, the design method of the heavy vehicle traffic spanning plate for the underground coal conveying shallow-buried corridor of the thermal power plant is further provided, and comprises the following steps:
first, stress transfer analysis of the downforce of the heavy-duty vehicle tire.
According to the downward pressure of heavy-load vehicle tires on the load-bearing spanning plate 1, analyzing the stress transmission of the load-bearing spanning plate 1 and the additional stress of the side wall of the shallow gallery 5, and specifically comprising the following steps:
(1) Tire wheel pressure calculation parameter setting, namely setting heavy-duty vehicle wheel pressure P (kN), which can be obtained by inquiring different vehicle information;
the wheel pressure of the vehicle is set to be transmitted to the top plate 4 through the concentrated wheels, the concentrated load P of the wheel pressure is uniformly distributed in the range of the width b (m) and the length a (m) of the top plate 4, and the concentrated load P is equivalent to the uniformly distributed load q of each meter of plate belt acting on the top plate 4 0 (kP a M), calculating the span direction of the equivalent plate strip perpendicular to the top plate 4,
the calculation method of the wheel pressure distribution range parameters a and b is as follows:
the value of the distribution width b along the span direction of the top plate 4: b=b 1 ，
The value of the distribution width a in the span direction of the vertical top plate 4:
wheel acts on the span of the boardWhen the diameter of the middle part is in the middle,
a=a when the wheel acts on the support of the plate 1 +h，
Wherein a is 1 (m)、b 1 (m) is the wheel footprint dimension perpendicular to the span of the roof 4 and parallel to the span direction, which can be obtained by querying different vehicle and tire information; l (m), h (m) are calculated span of the roof 4, thickness of the roof 4, l depends on the actual width B (m) of the shallow buried corridor required, l=b+3 when the underground corridor width B is less than or equal to 6m, l=b+4 when the underground corridor width 6 < B is less than or equal to 10m, thickness of the roof 4The top plate 4 is positioned in the span direction in alignment with the center of the width direction of the underlying shallow trench.
(2) Uniform load q acting on each meter of strip width of top plate 4 0 The left supporting foundation beam 2 and the right supporting foundation beam 3 are transmitted to generate strip-shaped uniform load p on the top surface of the reinforced foundation 6 0 (kP a /m)，
Wherein c (m) is the section width of the left supporting foundation beam 2 and the right supporting foundation beam 3, c=2 is taken when the underground corridor width B is less than or equal to 6m, and c=3 is taken when the underground corridor width is more than 6 and less than or equal to 10 m; n is the number of wheels simultaneously acting on the roof panel 4, n=2 for a conventional vehicle.
(3) Horizontal additional stress sigma of side wall of shallow buried corridor 5 x The parameter settings are calculated and the parameters are set,
bar-shaped uniform load p 0 The horizontal distance between the midpoint of uniformly distributed load and the side wall of the shallow buried corridor 5 is x (m), the vertical distance from the bottom surface of the left support foundation beam 2 or the right support foundation beam 3 to the arbitrary height A point of the side wall of the corridor 5 is z (m), and the uniformly distributed load p is in a strip shape 0 Acting to transfer horizontal additional stresses sigma downwards through the reinforced foundation 6 x ；
(4) Bar-shaped uniform load p 0 Horizontal additional stress sigma generated at arbitrary height A of the side wall of the shallow buried corridor 5 x The calculation formula is as follows:
wherein,as the depth of the point A changes, z, becomes deeper, sigma x Gradually decreasing.
Secondly, carrying out design of the bearing spanning plate 1: the size of the bearing spanning plate 1 and the size of the reinforced foundation 6 are designed according to the size of the shallow gallery 5. The method comprises the following specific steps:
(1) Setting A s 、A' s The longitudinal steel bar cross-section area is arranged at the bottom and the top of the top plate 4 in the span direction, and the design method of the reinforcing bars of each meter of plate strip in the span direction of the top plate 4 is as follows:
α 1 f c bx＝f y A s -f' y A' s ，
wherein M is q 0 Calculating a bending moment design value under the action of the maximum midspan; f (f) c The concrete axle center compressive strength design value is obtained by inquiring related specifications according to the strength grade of the concrete; alpha 1 As a factor, alpha when the strength grade of the concrete is not more than C50 1 =1.0; b is the calculated plate band width 1m; a' s A is the distance from the resultant force point of the longitudinal steel bars at the top to the top surface of the top plate 4 s Distance from resultant force point of bottom longitudinal steel bar to bottom surface of top plate 4: a when longitudinal steel bars are arranged in a row s ＝a' s =0.045, a when the longitudinal bars are arranged in two rows s ＝a' s ＝0.07；h 0 ＝h-a s ；
Setting reinforcement bars perpendicular to the radial direction of the plate, and constructing and setting the reinforcement bars according to the reinforcement bar spacing of 200mm with the diameter of 20;
the left supporting foundation beam 2 and the right supporting foundation beam 3 are used as the connection of the bearing spanning plate 1 and the reinforced foundation 6, and are designed according to a rigid body, the foundation beams are shallow-buried, the buried depth is 1m, the height of the ground part is 0.3m higher, and the section height H=1+0.3, namely 1.3m; the steel bars at the top and the bottom of the foundation beam are arranged according to a steel bar spacing 150mm structure with the diameter of 20, and the stirrups are arranged according to a steel bar spacing 200mm structure with the diameter of 12.
To verify the safety, the load p is uniformly distributed in a strip shape 0 Additional stress sigma in horizontal direction generated to the side wall of shallow buried corridor 5 x I.e. the horizontal additional stress sigma to which the side walls of the shallow corridor 5 are subjected when the load-carrying vehicle passes through the load-bearing spanning plate 1 x The method comprises the steps of carrying out a first treatment on the surface of the Modeling shallow buried corridor 5 by finite element analysis software and applying horizontal additional stress sigma calculated by the method x The bearing capacity rechecking of the side wall of the shallow gallery 5 is realized, and the structural safety of the side wall of the shallow gallery 5 is ensured when a heavy-duty vehicle passes through.
(2) The design method of the reinforced foundation 6 comprises the following steps:
setting calculation parameters of the reinforced foundation 6, wherein the depth of the reinforced foundation 6 is Z, and the bearing capacity strength of the reinforced foundation is f a The bearing capacity strength of the original soil before strengthening is f ab ：
Strengthen the bearing capacity strength f of foundation a The following should be satisfied: p is p 0 ≤f a ；
Strength f of bearing force of original soil before strengthening ab The following should be satisfied:
the foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. Heavy-duty vehicle passing crossing plate for underground coal conveying shallow-buried corridor of thermal power plant, comprising a shallow-buried corridor (5), and being characterized in that: the shallow buried corridor is characterized by further comprising a bearing spanning plate (1), reinforced foundations (6) are arranged outside the side walls of the two sides of the shallow buried corridor (5), the bearing spanning plate (1) is arranged on the two reinforced foundations (6), the top of the bearing spanning plate (1) exceeds the ground, and the lower surface of the bearing spanning plate (1) is shaped like a Chinese character 'ji';
the bearing crossing plate (1) comprises a left supporting foundation beam (2), a top plate (4) and a right supporting foundation beam (3), wherein the top plate (4) is a reinforced concrete unidirectional stressed plate, the left supporting foundation beam (2) and the right supporting foundation beam (3) are respectively arranged on two sides of the top plate (4), the left supporting foundation beam (2) and the right supporting foundation beam (3) are respectively arranged on two reinforced foundations (6) through cushion layers (7), the lower surface of the top plate (4) is of a concave structure, the elevation of the lower surface of the top plate (4) is higher than that of the upper surface of the shallow buried corridor (5), and a cavity (9) is arranged between the lower surface of the top plate (4) and the upper surface of the shallow buried corridor (5).
2. The heavy truck passing crossing plate for a thermal power plant underground coal conveying shallow gallery of claim 1, wherein: and the outer filling soil of the side walls of the two sides of the shallow buried corridor (5) is compacted to form a reinforced foundation (6).
3. The heavy truck passing crossing plate for a thermal power plant underground coal conveying shallow gallery of claim 1, wherein: and the outer filling soil of the side walls of the two sides of the shallow buried corridor (5) is changed into sand and stone for natural slope-placing treatment to form a reinforced foundation (6).
4. The heavy truck passing crossing plate for a thermal power plant underground coal conveying shallow gallery of claim 1, wherein: the left supporting foundation beam (2), the top plate (4) and the right supporting foundation beam (3) are of reinforced concrete integral pouring structures.
5. The heavy truck passing crossing plate for a thermal power plant underground coal conveying shallow gallery of claim 1, wherein: a ramp (8) is arranged between the upper surface of the left support foundation beam (2) and the ground.
6. The design method of the heavy-duty vehicle passing crossing plate for the underground coal conveying shallow-buried corridor of the thermal power plant according to claim 1, which is characterized by comprising the following steps:
61 Stress transfer analysis of heavy duty vehicle tire downforce: analyzing the stress transmission process of the load-bearing spanning plate (1) and the additional stress of the side walls at the two sides of the shallow gallery (5) according to the downward pressure of the heavy-load vehicle tire on the load-bearing spanning plate (1);
the stress transfer analysis of the heavy-duty vehicle tire down force comprises the following steps:
611 Tire wheel pressure calculation parameter setting, namely setting the wheel pressure P (kN) of the heavy-duty vehicle;
the method comprises the steps of setting the concentrated transmission of the wheel pressure P of a vehicle to a top plate (4) through wheels, uniformly distributing the concentrated load P of the wheel pressure in the range of b (m) and a (m) length on the top plate (4), and equivalent the concentrated load P to uniformly distributing load q of each meter of plate belt acting on the top plate (4) 0 (kP a ) Calculating the span direction of the equivalent plate belt vertical to the top plate (4),
the calculation method of the wheel pressure distribution range parameters a and b is as follows:
the value of the distribution width b along the span direction of the top plate (4): b=b 1 ，
The value of the distribution width a of the vertical top plate (4) along the span direction is as follows:
when the wheel acts on the middle part of the span of the plate,
a=a when the wheel acts on the support of the plate 1 +h，
Wherein a is 1 (m)、b 1 (m) is the wheel footprint dimension perpendicular to the span of the top plate (4) and parallel to the span direction; l (m), h (m) are calculated spans of the roof (4), the thickness of the roof (4), l depends on the actual width B (m) of the shallow buried corridor required, l=b+3 is taken when the underground corridor width B is less than or equal to 6m, l=b+4 is taken when the underground corridor width 6 < B is less than or equal to 10m, the thickness of the roof (4)The top plate (4) is positioned along the span direction and aligned with the center of the width direction of the shallow buried corridor below;
612 Uniform load q acting on each meter of strip width of top plate (4) 0 The strip-shaped uniform load p is generated on the top surface of the reinforced foundation (6) through the transmission of the left supporting foundation beam (2) and the right supporting foundation beam (3) 0 (kP a )，
C (m) is the section width of the left supporting foundation beam (2) and the right supporting foundation beam (3), c=2 is taken when the underground corridor width B is less than or equal to 6m, c=3 is taken when the underground corridor width is more than or equal to 6 and less than or equal to 10m, and N is the number of wheels simultaneously acting on the top plate 4;
613 Lateral wall horizontal additional stress sigma of shallow buried corridor (5) x The parameter settings are calculated and the parameters are set,
bar-shaped uniform load p 0 The horizontal distance between the uniformly distributed load midpoint and the side wall of the shallow buried corridor (5) is x (m), the vertical distance from the bottom surface of the left support foundation beam (2) or the right support foundation beam (3) to any height A point of the side wall of the corridor (5) is z (m), and the bar-shaped uniformly distributed load p acts on the top surface of the reinforced foundation (6) 0 Acting to transfer horizontal additional stresses sigma downwards through the reinforcing foundation (6) x ；
614 Strip-shaped uniform load p 0 Horizontal additional stress sigma generated at arbitrary height A of gallery (5) sidewall x The calculation formula is as follows:
wherein,as the depth of the point A changes, z, becomes deeper, sigma x Gradually reducing;
62 Carrying out the design of the load-bearing spanning plate (1): the method comprises the following steps of designing the sizes of a bearing spanning plate (1) and a reinforced foundation (6) according to the size of a shallow gallery (5), wherein the design of the bearing spanning plate comprises the following steps:
621 Setting A) s 、A' s The method for designing the reinforcing bars of each meter of plate strip in the span direction of the top plate (4) comprises the following steps of:
α 1 f c bx＝f y A s -f' y A' s ，
wherein M is q 0 Calculating a bending moment design value under the action of the maximum midspan; f (f) c The concrete axle center compressive strength design value is obtained by inquiring related specifications according to the strength grade of the concrete; alpha 1 As a factor, alpha when the strength grade of the concrete is not more than C50 1 =1.0; b is the calculated plate band width 1m; a' s A is the distance from the resultant force point of the longitudinal steel bars at the top to the top surface of the top plate (4), a s The distance from the resultant force point of the longitudinal steel bars at the bottom to the bottom surface of the top plate (4) is as follows: a when longitudinal steel bars are arranged in a row s ＝a' s =0.045, a when the longitudinal bars are arranged in two rows s ＝a' s ＝0.07；h 0 ＝h-a s ；
Setting reinforcement bars perpendicular to the radial direction of the plate, and constructing and setting the reinforcement bars according to the reinforcement bar spacing of 200mm with the diameter of 20;
the left supporting foundation beam (2) and the right supporting foundation beam (3) are used as connection of a bearing spanning plate (1) and a reinforced foundation (6), the foundation beams are designed according to a rigid body, the foundation beams are in a shallow burying mode, the burying depth is 1m, the height of the foundation beams is 0.3m higher than the ground, and the section height H=1+0.3, namely 1.3m; the steel bars at the top and the bottom of the foundation beam are arranged according to a steel bar spacing 150mm structure with the diameter of 20, and the stirrups are arranged according to a steel bar spacing 200mm structure with the diameter of 12;
622 A reinforced foundation (6) design method:
the calculation parameters of the reinforced foundation (6) are set, the depth of the reinforced foundation (6) is Z, and the bearing capacity strength of the reinforced foundation is f a The bearing capacity strength of the original soil before strengthening is f ab ：
Strengthen the bearing capacity strength f of foundation a The method meets the following conditions: p is p 0 ≤f a ；
Strength f of bearing force of original soil before strengthening ab The method meets the following conditions:
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Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050050727A (en) * | 2003-11-26 | 2005-06-01 | 이창원 | Trenchless method of underground passage and structure thereof |
| CN102134857A (en) * | 2011-02-14 | 2011-07-27 | 上海市城市建设设计研究院 | Underground vehicle driving channel |
| JP2012036616A (en) * | 2010-08-05 | 2012-02-23 | Ohbayashi Corp | Backfill structure and backfill method |
| KR101526461B1 (en) * | 2014-05-16 | 2015-06-05 | 우백건설 주식회사 | Functional precast concrete culvert |
| CN104727342A (en) * | 2015-02-11 | 2015-06-24 | 上海市政工程设计研究总院（集团）有限公司 | Ribbing hollow plate underground passage structure |
| CN104846840A (en) * | 2015-04-23 | 2015-08-19 | 东北大学 | Shallowly-buried soft soil integrated trench reinforcing device and construction method |
| CN105113354A (en) * | 2015-08-17 | 2015-12-02 | 苏州同尚工程设计咨询有限公司 | Pre-buried pipeline suitable for pavement shallow layers |
| US9322137B2 (en) * | 2011-09-13 | 2016-04-26 | Mustapha Aboulcaid | Method for building structures, particularly passages under operating railways or the like |
| CN106049537A (en) * | 2016-08-04 | 2016-10-26 | 中国华冶科工集团有限公司 | Comprehensive pipe gallery embedded part fixing device and fixing method thereof |
| CN205742299U (en) * | 2016-06-15 | 2016-11-30 | 中国电建集团铁路建设有限公司 | A kind of an ultra shallow buries the float Structure of shield tunnel |
| CN106759473A (en) * | 2016-11-11 | 2017-05-31 | 中国建筑第八工程局有限公司 | The constructing structure and its construction method of underground pipe gallery and road |
| CN107653787A (en) * | 2017-08-27 | 2018-02-02 | 中铁二十四局集团有限公司 | It is a kind of to protect the construction method across the underground high voltage cable box culvert of foundation ditch |
| CN108360566A (en) * | 2018-04-26 | 2018-08-03 | 中铁第四勘察设计院集团有限公司 | City integrated piping lane builds structure jointly with rail traffic underground open-cut station main body |
| CN210216044U (en) * | 2019-06-05 | 2020-03-31 | 中国能源建设集团安徽省电力设计院有限公司 | Heavy-duty vehicle passing crossing plate for underground coal conveying shallow-buried gallery of thermal power plant |
-
2019
- 2019-06-05 CN CN201910484359.3A patent/CN110093822B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050050727A (en) * | 2003-11-26 | 2005-06-01 | 이창원 | Trenchless method of underground passage and structure thereof |
| JP2012036616A (en) * | 2010-08-05 | 2012-02-23 | Ohbayashi Corp | Backfill structure and backfill method |
| CN102134857A (en) * | 2011-02-14 | 2011-07-27 | 上海市城市建设设计研究院 | Underground vehicle driving channel |
| US9322137B2 (en) * | 2011-09-13 | 2016-04-26 | Mustapha Aboulcaid | Method for building structures, particularly passages under operating railways or the like |
| KR101526461B1 (en) * | 2014-05-16 | 2015-06-05 | 우백건설 주식회사 | Functional precast concrete culvert |
| CN104727342A (en) * | 2015-02-11 | 2015-06-24 | 上海市政工程设计研究总院（集团）有限公司 | Ribbing hollow plate underground passage structure |
| CN104846840A (en) * | 2015-04-23 | 2015-08-19 | 东北大学 | Shallowly-buried soft soil integrated trench reinforcing device and construction method |
| CN105113354A (en) * | 2015-08-17 | 2015-12-02 | 苏州同尚工程设计咨询有限公司 | Pre-buried pipeline suitable for pavement shallow layers |
| CN205742299U (en) * | 2016-06-15 | 2016-11-30 | 中国电建集团铁路建设有限公司 | A kind of an ultra shallow buries the float Structure of shield tunnel |
| CN106049537A (en) * | 2016-08-04 | 2016-10-26 | 中国华冶科工集团有限公司 | Comprehensive pipe gallery embedded part fixing device and fixing method thereof |
| CN106759473A (en) * | 2016-11-11 | 2017-05-31 | 中国建筑第八工程局有限公司 | The constructing structure and its construction method of underground pipe gallery and road |
| CN107653787A (en) * | 2017-08-27 | 2018-02-02 | 中铁二十四局集团有限公司 | It is a kind of to protect the construction method across the underground high voltage cable box culvert of foundation ditch |
| CN108360566A (en) * | 2018-04-26 | 2018-08-03 | 中铁第四勘察设计院集团有限公司 | City integrated piping lane builds structure jointly with rail traffic underground open-cut station main body |
| CN210216044U (en) * | 2019-06-05 | 2020-03-31 | 中国能源建设集团安徽省电力设计院有限公司 | Heavy-duty vehicle passing crossing plate for underground coal conveying shallow-buried gallery of thermal power plant |
Non-Patent Citations (1)
| Title |
|---|
| 南昌4号线艾溪湖北路段线路敷设方式研究;黄;;山西建筑(第31期);全文 * |
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