CN113668356A - Tank-box mixed beam and application thereof - Google Patents
Tank-box mixed beam and application thereof Download PDFInfo
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- CN113668356A CN113668356A CN202111001869.4A CN202111001869A CN113668356A CN 113668356 A CN113668356 A CN 113668356A CN 202111001869 A CN202111001869 A CN 202111001869A CN 113668356 A CN113668356 A CN 113668356A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention discloses a tank-box hybrid beam and application thereof, belonging to the technical field of bridges. The tank box hybrid beam has a simple structure, is simple and convenient to arrange, can effectively meet the torsion resistance design of each part of a beam body in the longitudinal direction, can reduce the dead weight of the beam body structure while improving the torsion resistance of the beam body, saves materials, improves the seismic resistance of the beam body, can be widely applied to various bridge projects, is particularly suitable for horizontal swivel bridge projects which are controlled by conditions such as line elevation, longitudinal slope, line shape, bridge clearance and the like, are provided with a plane with small curvature radius and are limited in building height, and has good application prospect and popularization value.
Description
Technical Field
The invention belongs to the technical field of bridges, and particularly relates to a tank box hybrid beam and application thereof.
Background
In the design process of the bridge, the structural design of the beam body is very important, and the design construction cost and the design service life of the bridge are often directly limited.
At present, the cross section of a main beam of a conventional bridge is mostly a concrete box beam or a steel box beam, although the integrity is good and the torsional rigidity is large, the building height is generally more than 2m, the beam height is large, and the design condition that the building height is limited is difficult to meet; meanwhile, the steel structure is poor in durability, the number of later maintenance times is large, and the maintenance cost is high, so that the steel structure is frequently rarely adopted in the railway engineering of the last crossing.
In the prior art, for bridge engineering with limited building height, a main beam structure mostly adopts a channel beam scheme, and the channel beam scheme has the characteristics of low bridge building height, light structure, attractive appearance, good noise reduction effect, high section space utilization rate and the like. However, because the slot-shaped cross section belongs to the open end face, the torsional rigidity is weak, so that the slot-shaped cross section is mostly applied to a line position with a small span and a plane with a straight line or a large curve radius, and is applied in the form of a simply supported beam, a continuous beam or a cable-stayed bridge, so that the span of a main beam structure is often small, the application in a large-span environment and the application in a horizontal swivel bridge engineering are difficult to meet, and obvious limitations exist.
Disclosure of Invention
Aiming at one or more of the defects or the improvement requirements in the prior art, the invention provides the trough-box hybrid beam and the application thereof, which can effectively solve the problem of insufficient torsional bearing capacity of a trough-shaped beam body, not only can meet the requirement of reducing the building height of a main beam, but also can obviously improve the span of the bridge and realize the accurate design and construction of the bridge.
In order to achieve the above objects, according to one aspect of the present invention, there is provided a channel-box hybrid beam, which includes a base plate extending in a longitudinal direction of a beam body, a box-type beam section formed above the base plate, and channel-type beam sections formed at both ends of the box-type beam section, respectively;
the box-shaped beam section comprises first side plates which are respectively arranged at two transverse sides of the bottom plate and extend along the longitudinal direction, and top plates are arranged at the tops of the two first side plates to form a box-shaped structure with a closed top;
the groove-shaped beam section comprises second side plates which are respectively arranged on two transverse sides of the bottom plate; the second side plate extends longitudinally along the beam body, one end of the second side plate extends to the end part of the bottom plate, the other end of the second side plate extends to one side of the box-shaped beam section and is connected with the end part of the first side plate, and therefore continuous side plate structures are formed on two transverse sides of the bottom plate respectively.
As a further improvement of the present invention, the height of the second side plate increases from one end away from the first side plate to the other end.
As a further improvement of the present invention, the height of the second side plate connecting with one end of the first side plate is equal to the height of the first side plate.
As a further improvement of the present invention, the top surface of the second side plate is an arc-shaped surface in the extending direction.
As a further improvement of the invention, at least one first partition board is arranged between the two first side boards;
the first partition plate extends longitudinally, the top and the bottom of the first partition plate are respectively connected with the top plate and the bottom plate, and the box-type beam section is divided into a multi-chamber structure in the transverse direction of the beam body.
As a further improvement of the invention, the bottom of the box-shaped beam section is provided with a reinforcing part for increasing the thickness of a bottom plate at the joint of the box-shaped beam section and the supporting structure.
As a further improvement of the present invention, the top plate and/or at least one of the first side plates is provided with a plurality of light holes.
As a further improvement of the invention, a contact net structure is arranged on the inner wall surface of at least one first side plate; and/or the top of at least one second side plate is provided with a contact net structure.
In another aspect of the present invention, there is provided a bridge structure including the tank hybrid beam, and provided with a pillar at a bottom thereof;
the bottom of the upright post is supported on the foundation, and the top of the upright post is supported and connected with the bottom surface of the bottom plate of the box-shaped beam section.
As a further improvement of the invention, the column support is connected to the longitudinal middle of the box girder section.
As a further improvement of the invention, the length of the box-shaped beam section on one side in the longitudinal direction of the upright post is not less than 1/3 of the single-hole span on the side of the upright post.
The above-described improved technical features may be combined with each other as long as they do not conflict with each other.
Generally, compared with the prior art, the technical scheme conceived by the invention has the following beneficial effects:
(1) according to the trough box mixed beam, the box beam sections and the trough beam sections are combined, so that the anti-torsion function design of all parts of the beam body is effectively realized, the anti-torsion bearing capacity setting requirements of all parts of the beam body are met, the arrangement of the box web trough beam is avoided, the materials during beam body forming are saved, the beam body design and construction cost is reduced, and the trough box mixed beam is energy-saving and environment-friendly.
(2) According to the hybrid beam of the tank box, the height change form of the second side plate in the longitudinal direction of the beam body is preferably designed, so that the torsion resistance of different parts is met, the integrity and integrity of the side plates on the two transverse sides of the bottom plate in the longitudinal direction are fully considered, the structural stability is guaranteed, the self weight of the beam body is reduced, the use of materials is saved, and the landscape characteristics of the beam body are improved.
(3) According to the bridge structure, the combined arrangement of the structures such as the tank mixing beam and the upright post forms a rotating body T-shaped structure with stable structural stress, so that the stability and reliability of the beam body design and support are fully ensured, a weak section with insufficient torsion resistance in the longitudinal direction of the beam body structure is avoided, and the stability of the structure is fully ensured.
(4) The tank box hybrid beam has a simple structure, is simple and convenient to arrange, can effectively meet the torsion resistance design of each part of a beam body in the longitudinal direction, can reduce the dead weight of the beam body structure while improving the torsion resistance of the beam body, saves materials, improves the seismic resistance of the beam body, can be widely applied to various bridge projects, is particularly suitable for horizontal swivel bridge projects which are controlled by conditions such as line elevation, longitudinal slope, line shape, bridge clearance and the like, are provided with a plane with small curvature radius and are limited in building height, and has good application prospect and popularization value.
Drawings
FIG. 1 is a schematic perspective view of a hybrid girder of a tank in an embodiment of the present invention;
FIG. 2 is a structural elevation view of a hybrid channel box beam according to an embodiment of the present invention;
FIG. 3 is a top view of the construction of a hybrid channel box beam according to an embodiment of the present invention;
FIG. 4 is a sectional view of the structure A-A of the hybrid girder of the tank in the embodiment of the present invention;
FIG. 5 is a sectional view of the structure B-B of the hybrid girder of the tank in the embodiment of the present invention;
FIG. 6 is a schematic structural view of a solid web channel beam participating in structural comparison according to an embodiment of the present invention;
FIG. 7 is a schematic view of a box beam structure participating in structural comparison in an embodiment of the present invention;
FIG. 8 is a schematic structural view of a box web channel beam participating in structural comparison in an embodiment of the present invention;
FIG. 9 is a schematic cross-sectional view of a box girder segment configured as a single box with multiple chambers according to an embodiment of the present invention;
in all the figures, the same reference numerals denote the same features, in particular:
1. a box beam section; 2. a trough-shaped beam section; 3. a column; 4. a foundation;
101. a top plate; 102. a first side plate; 103. a reinforcing portion; 104. a first base plate; 105. a first separator; 201. a second side plate; 202. a second base plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Example (b):
referring to fig. 1 to 3, the channel box hybrid beam according to the preferred embodiment of the present invention includes a box beam section 1 and a channel beam section 2 which are sequentially arranged in a longitudinal direction of a beam body. The box-type beam section 1 is arranged in the middle of the beam body structure, and the two longitudinal sides of the box-type beam section are respectively provided with the groove-type beam sections 2, so that the beam body structure shown in the figure 1 is formed.
Specifically, the trough-type beam section 2 in the preferred embodiment is a span section, and the box-type beam section 1 is a support section, that is, the box-type beam section 1 is disposed at a position contacting with a pier, a column, or other structures. Because the torque of the beam body is mainly concentrated on the supporting part, the contact part of the trough beam and the supporting structure is replaced by a box beam in the preferred embodiment, and the stress stability of the torque concentrated part of the beam body is improved by the arrangement of the box beam.
As shown in fig. 1, the channel box hybrid beam in the preferred embodiment includes a bottom plate extending longitudinally along the beam body, the bottom plate including a first bottom plate 104 provided at the box-type beam section 1 and a second bottom plate 202 provided at the channel-type beam section 2. The box-shaped beam section 1 includes first side plates 102 respectively disposed at two lateral sides of a first bottom plate 104, and a top plate 101 disposed at the top of the two first side plates 102 to form a closed box cross-sectional structure, as shown in fig. 4.
In the preferred embodiment, the matching part of the channel beam and the supporting structure is arranged into a 'box beam' structure, so that the torsion resistance of the beam body structure is greatly improved. In the preferred embodiment, a full-web channel beam, a closed box beam, a box-web channel beam of equal beam height and clear width are used for comparison as shown in table 1 below. Among them, the solid-web channel beam and the box-web channel beam are two more widely used channel beams, as shown in fig. 6 and 8, and fig. 7 shows a closed-end box beam of a corresponding size.
TABLE 1 comparison table of characteristic values of beam bodies with different sections
According to the comparison, under the condition of equal basic conditions, the difference of the cross-sectional areas of the closed box-shaped beam and the solid-web groove-shaped beam is 1.24 times, the difference of the bending moments of inertia is 1.52 times, and the two cross-sectional areas are in the same order of magnitude, but the torsional inertia of the closed box-shaped beam and the solid-web groove-shaped beam is 120 times and two orders of magnitude different. Moreover, even compared with the box web groove type beam with better torsion resistance, the bending moment of inertia of the closed box type beam is 0.9 times of that of the closed box type beam, and the closed box type beam are basically equal; however, the moment of inertia of the closed box girder is 4.8 times that of the box-web channel girder, and the sectional area is only 0.71 times that of the box-web channel girder.
Compared with a solid-web groove-shaped beam, the closed box-shaped beam has the advantages that the cross-sectional area is slightly increased, the torsional inertia is greatly improved, and the torsional performance advantage is obvious. Meanwhile, compared with the box web type channel beam, the closed box type beam has the advantages that the cross section area is obviously smaller, so that the self weight of the beam body is lighter, and the material consumption of the beam body is less; moreover, compared with the box-web channel beam, the closed box beam has the advantages of obviously larger torsional inertia and obviously stronger torsional capacity. For this reason, in the preferred embodiment, the part of the beam body, which is relatively concentrated in bending moment, is set to be in the form of a closed box beam; correspondingly, the beam body suspension part (namely the part with relatively small bending moment effect) is set to be a solid-web groove-shaped beam structure, so that the bending resistance requirement of the beam body is met, the self weight of the beam body is reduced, the waste of materials is avoided, and the energy-saving and environment-friendly effects are achieved.
Further, when the transverse width of the beam body is large, it is preferable to correspondingly arrange a plurality of first partition plates 105 in the box-type beam section 1, wherein each first partition plate 105 extends along the longitudinal direction, and the top and bottom of each first partition plate 105 are respectively connected with the top plate 101 and the first bottom plate 104, so as to divide the box-type beam section 1 into a "single-box multi-chamber" structure in the transverse direction of the beam body, such as the "single-box double-chamber" structure shown in fig. 9, thereby improving the structural strength of the box-type beam section 1. It can be understood that the number of the first partition boards 105 can be more according to the actual design and construction requirements, and the box-type beam section 1 is further divided into a single-box three-chamber structure, a single-box four-chamber structure or other multi-chamber structure forms in the transverse direction of the beam body.
As shown in fig. 1 to 3, the box-shaped beam section 1 in the preferred embodiment is provided with a trough-shaped beam section 2 at both ends thereof, and includes a second bottom plate 202 and second side plates 201 respectively disposed at both sides of the second bottom plate 202. Obviously, for the channel beam section 2, there is no top plate on the top, and it is in an open state. Meanwhile, the first bottom plate 104 is connected with the second bottom plate 202 at an end, and the first side plate 102 is connected with the second side plate 201 at an end, so that a bottom plate structure and a side plate structure which are continuous in the longitudinal direction are formed, and a beam body structure as shown in fig. 1 is formed.
In more detail, in the preferred embodiment, in combination with the stress characteristics of the beam structure, i.e. the more close to the box beam section 1, the more the torsion resistance is, therefore, the height of the second side plate 201 increases from one end away from the box beam section 1 to the other end, until the height of the first side plate 102 increases. The structural form of the second side plate 201 is arranged in this way, on one hand, the material is saved, and the self weight is reduced; on the other hand, since box beam section 1 is a closed box structure, the height setting of its first side plate 102 should satisfy the clearance requirement of the beam body in the vertical direction, namely:
if the torsional resistance of the beam is considered, the actual height of the first side plate 102 does not need to be set to the height shown in fig. 4, but the height of the first side plate 102 needs to be correspondingly increased after the limitation requirement of the beam in the vertical direction is considered, and thus the height of the second side plate 201 does not need to be set to be the same as the height of the first side plate 102 for the channel-shaped beam section 2 without top plate limitation.
In addition, in the preferred embodiment, as shown in fig. 2, the top surface of the second side plate 201 is curved in the extending direction, i.e., the top of the second side plate 201 extends in a parabolic manner in the longitudinal direction of the beam body.
In one embodiment the channel mixing beam is provided in the form of a swivel T-beam as shown in fig. 1, with a vertical column 3 provided below the longitudinal middle of the bottom surface of the box beam section 1, the bottom of the column 3 being connected to and supported by a foundation 4, providing support for the entire channel mixing beam. Accordingly, in the above-described tank-box hybrid beam, the length of the box-type beam section 1 on the side of the upright 3 is not less than 1/3 of the single-hole span on the side. In addition, in order to improve the lighting effect of the box-type beam section 1, a plurality of light-transmitting holes can be formed in the top plate 101 and/or at least one side first side plate 102 of the closed box-type beam, so that the lighting effect of the closed box-type beam is enhanced.
It can be understood that the arrangement form of the channel box hybrid beam is not limited to the swivel T-beam, and the channel box hybrid beam can also be correspondingly arranged in a simple beam, a continuous beam or a continuous rigid frame mechanism, and only the section which is arranged as the channel beam and cannot meet the torque design requirement needs to be correspondingly replaced by the box-type beam section 1, and then the stress design and the limit design of the beam body are integrated.
Further, in a preferred embodiment, the tank box hybrid beam is a curved beam, as shown in fig. 3, and at this time, if a track foundation is arranged above the bottom plate, an ultra-high foundation layer as shown in fig. 4 and 5 needs to be arranged, so that the ultra-high requirement of the vehicle and the track vehicle in operation is met. For the trough-shaped beam section 2, a mechanism support for matching a contact net of a vehicle and the like is arranged above the top of the second side plate 201 on at least one side, as shown in fig. 5; in the case of the box girder segment 1, a mechanism for matching a catenary of a vehicle or the like is supported on an inner sidewall surface of the first side plate 102 on at least one side, as shown in fig. 4.
Preferably, in order to improve the support stability of the box-shaped beam section 1 at the upright 3, a thickening process is performed on the bottom of the box-shaped beam section 1, that is, a reinforcement 103 as shown in fig. 1 and 2 is formed. In actual installation, the thickness of the reinforcing portion 103 and the extension length along the longitudinal ends of the beam body can be optimized according to actual conditions, which is not described herein.
In the actual design process, the design process of the tank hybrid beam preferably includes: firstly, carrying out design calculation on a beam body according to the section of the channel beam to obtain the torque of each section, carrying out verification calculation on the torsional bearing capacity, and determining a section with insufficient torsional capacity in the channel beam structure; secondly, replacing the beam section with insufficient torsion resistance with the box-shaped beam section 1, re-checking the torsion resistance bearing capacity of the beam body on the basis, and further optimizing the section structure; finally, according to the engineering characteristics, the analysis and checking calculation of the aspects of dynamic performance, deformation performance, temperature mode, construction method and the like are carried out, and the structural design is perfected.
The tank box hybrid beam has a simple structure, is simple and convenient to set, can effectively meet the design of the torsion resistance of each part of a beam body in the longitudinal direction, can reduce the dead weight of the beam body structure while improving the torsion resistance of the beam body, saves materials, improves the seismic resistance of the beam body, can be widely applied to various bridge projects, is particularly suitable for horizontal swivel bridge projects which are controlled by conditions such as line elevation, longitudinal slope, line shape, bridge clearance and the like, are positioned on a bridge plane with a small curvature radius and are limited in building height, and has a good application prospect and popularization value.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A tank-box mixed beam comprises a bottom plate extending along the longitudinal direction of a beam body, and is characterized in that a tank-type beam section is formed above the bottom plate, and two ends of the tank-type beam section are respectively provided with a tank-type beam section;
the box-shaped beam section comprises first side plates which are respectively arranged at two transverse sides of the bottom plate and extend along the longitudinal direction, and top plates are arranged at the tops of the two first side plates to form a box-shaped structure with a closed top;
the groove-shaped beam section comprises second side plates which are respectively arranged on two transverse sides of the bottom plate; the second side plate extends longitudinally along the beam body, one end of the second side plate extends to the end part of the bottom plate, the other end of the second side plate extends to one side of the box-shaped beam section and is connected with the end part of the first side plate, and therefore continuous side plate structures are formed on two transverse sides of the bottom plate respectively.
2. The channel mixing beam defined in claim 1, wherein the height of the second side plate increases in order from one end facing away from the first side plate to the other end.
3. The channel mixing beam defined in claim 2 wherein the second side plate is connected to the first side plate at an end thereof at a height equal to the height of the first side plate.
4. The channel mixing beam according to claim 2 or 3, wherein the top surface of the second side plate is an arc-shaped surface in the extending direction.
5. The channel mixing beam according to any one of claims 1 to 4, wherein at least one first partition is further arranged between the two first side plates;
the first partition plate extends longitudinally, the top and the bottom of the first partition plate are respectively connected with the top plate and the bottom plate, and the box-type beam section is divided into a multi-chamber structure in the transverse direction of the beam body.
6. The channel box hybrid beam according to any one of claims 1 to 5, wherein the bottom of the box beam section is provided with a reinforcement for increasing the thickness of the floor at the junction of the box beam section and the support structure.
7. The channel mixing beam as defined in any one of claims 1 to 6, wherein a plurality of light transmission holes are formed on the top plate and/or at least one of the first side plates.
8. The channel mixing beam according to any one of claims 1 to 7, wherein a contact net structure is provided on an inner wall surface of at least one of the first side plates; and/or the top of at least one second side plate is provided with a contact net structure.
9. A bridge structure comprising the channel box hybrid beam as defined in any one of claims 1 to 8, and provided with a pillar at a bottom thereof;
the bottom of the upright post is supported on the foundation, and the top of the upright post is supported and connected with the bottom surface of the bottom plate of the box-shaped beam section.
10. The bridge construction of claim 9, wherein the length of the box beam section on the longitudinal side of the stud is no less than 1/3 of the single-hole span on the longitudinal side of the stud.
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