CN114922045A - Optimize steel bridge main truss structure of driving comfort level - Google Patents
Optimize steel bridge main truss structure of driving comfort level Download PDFInfo
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- CN114922045A CN114922045A CN202210594013.0A CN202210594013A CN114922045A CN 114922045 A CN114922045 A CN 114922045A CN 202210594013 A CN202210594013 A CN 202210594013A CN 114922045 A CN114922045 A CN 114922045A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 128
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- 206010040007 Sense of oppression Diseases 0.000 abstract description 5
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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
- E01D4/00—Arch-type bridges
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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
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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
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Abstract
The invention relates to a steel bridge main truss structure for optimizing driving comfort, which is characterized by comprising the following components: the steel truss arch main trusses are arranged above the bridge floor and comprise a middle span section and two side span sections, and the two side span sections are arranged on two opposite sides of the middle span section along the longitudinal bridge direction; the upper flat connection is used for connecting midspan sections of the two steel truss arch main trusses, and the upper flat connection is used for connecting side span sections of the two steel truss arch main trusses; lower tie-up, it is located go up the below of tie-up, lower tie-up is connected two the midspan section of steel truss arch main purlin, and two do not set up between the limit span section of steel truss arch main purlin lower tie-up, consequently, the clear height ratio of member to the bridge floor of limit span section lowest position is higher, has eliminated the bridge floor when driving because the vision oppression that the limit span height is lower brought feels, has promoted unobstructed nature and the comfort level of driving.
Description
Technical Field
The invention relates to the new technical field of new bridge structures, in particular to a steel bridge main truss structure for optimizing driving comfort.
Background
The arch bridge is an ancient bridge form, and the arch bridge of China is built in the middle and later period of east China and has a history of more than one thousand and eight hundred years. The arch bridge is also a common bridge form, and with the progress of bridge construction technology, more and more large-span arch bridges are designed and constructed, such as a boston Yangtze river bridge, a American New valley bridge, an Australian Sydney harbor bridge, a Darriy railway Yangtze river bridge, a Wushan Yangtze river bridge, an adult railway Duck pool river bridge and the like; when designing the large-span arch bridge, in order to lighten the dead weight of the structure and improve the utilization efficiency of materials, the main arch ring of the large-span arch bridge generally adopts a truss structure, commonly called a truss arch bridge.
In the related technology, due to the characteristics of small stress on the arch crown and large stress on the arch foot of the arch bridge, the truss arch bridge generally adopts a variable-height arch rib structure, namely, the distance between an upper chord arch rib and a lower chord arch rib is gradually increased from the arch crown to the arch foot so as to adapt to the stress requirement of the arch rib.
However, in the side span with lower truss height, the arrangement of the longitudinal plane connecting system can further compress the net height from the rod piece at the lowest position of the steel truss arch to the bridge surface, and the visual oppression is not enough due to the close and regular arrangement of the lower horizontal connecting rod pieces during driving, thereby affecting the driving comfort.
Disclosure of Invention
The embodiment of the invention provides a steel bridge main truss structure for optimizing driving comfort, and aims to solve the problem that the driving comfort is lower in a side span section with lower truss height in the related technology.
In a first aspect, a steel bridge main truss structure for optimizing driving comfort is provided, which includes: the steel truss arch main trusses are arranged above the bridge floor and comprise a middle span section and two side span sections, and the two side span sections are arranged on two opposite sides of the middle span section along the longitudinal bridge direction; the upper flat connection is used for connecting midspan sections of the two steel truss arch main trusses, and the upper flat connection is used for connecting side span sections of the two steel truss arch main trusses; and the lower parallel connection is positioned below the upper parallel connection, the lower parallel connection is connected with the midspan sections of the steel truss arch main trusses, and the lower parallel connection is not arranged between the side span sections of the steel truss arch main trusses.
In some embodiments, the upper parallel connection comprises: the first cross beams are arranged at intervals along the longitudinal bridge direction, one end of each first cross beam is fixed with one steel truss arch main truss, and the other end of each first cross beam is fixed with the other steel truss arch main truss; the first inclined rods are obliquely arranged relative to the first cross beam, one ends of the first inclined rods are fixed with the steel truss arch main truss, and the other ends of the first inclined rods are fixed with the first cross beam.
In some embodiments, four first diagonal rods are connected to one first cross beam, one end of each of the four first diagonal rods is fixed to the middle of one first cross beam, the other ends of the four first diagonal rods are respectively fixed to two steel truss arch main trusses, and the four first diagonal rods and one first cross beam form a cross-shaped structure.
In some embodiments, the steel bridge main truss structure further comprises: and the steel truss arch support frame is supported below the joint of the middle span section and the side span section.
In some embodiments, the lower parallel connection comprises: many second crossbeams, many the second crossbeam sets up to the interval along the longitudinal bridge, the one end and a slice of second crossbeam the midspan section of steel purlin arch main joist is fixed, the other end and another piece of crossbeam the midspan section of steel purlin arch main joist is fixed.
In some embodiments, the steel bridge main truss structure further includes a steel truss arch support frame, the lower parallel connection located at the steel truss arch support frame is disposed below the bridge deck, and the lower parallel connection further includes a plurality of fourth diagonal rods, one end of each fourth diagonal rod is fixed to the steel truss arch support frame, and the other end of each fourth diagonal rod is fixed to the second cross beam.
In some embodiments, the mid-span segment comprises: the first upper chords are laid along the longitudinal bridge direction; the first upper chords and the first lower chords are respectively arranged at intervals in a one-to-one correspondence manner, and the distance between the first upper chords and the first lower chords gradually decreases from two ends of the middle span section to the middle position of the middle span section; one end of each first vertical rod is fixed with the first upper chord, and the other end of each first vertical rod is fixed with the first lower chord; many second down tube, the second down tube for first montant slope sets up, the one end of second down tube with first upper chord is fixed, the other end of second down tube with first lower chord is fixed.
In some embodiments, the cross section of the first upper chord and the first lower chord is a box-shaped section, and the cross section of the first vertical bar and the second diagonal bar is an inverted-V-shaped section or a box-shaped section.
In some embodiments, the edge span segment comprises: a plurality of second upper chords which are laid along the longitudinal bridge direction; the second lower chords are respectively arranged in one-to-one correspondence with the second upper chords at intervals, and the distance between the second upper chords and the second lower chords is gradually increased from one end, away from the middle span section, of the side span section to one end, close to the middle span section, of the side span section; one end of each second vertical rod is fixed with the second upper chord, and the other end of each second vertical rod is fixed with the second lower chord; and the third inclined rods are obliquely arranged relative to the second vertical rods, one ends of the third inclined rods are fixed to the second upper chord, and the other ends of the third inclined rods are fixed to the second lower chord.
In some embodiments, the steel bridge main truss structure further comprises: many hoist cables, many the hoist cable sets up to the interval along the longitudinal bridge, the hoist cable perpendicular to the bridge floor, the one end of hoist cable is fixed in the steel purlin encircles main purlin, the other end of hoist cable is fixed in the bridge floor.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a steel bridge main truss structure for optimizing driving comfort, because two steel truss arch main trusses respectively comprise a middle span section and two side span sections, the two side span sections are arranged on two opposite sides of the middle span section along the longitudinal bridge direction, the upper parallel connection is connected with a midspan section of the two steel truss arch main trusses, the upper parallel connection is connected with the side span sections of the two steel truss arch main trusses, the lower parallel connection is connected with the midspan sections of the two steel truss arch main trusses, and the lower parallel connection is cancelled at the side span sections, therefore, the net height ratio from a rod piece at the lowest position of the side span sections to a bridge floor is higher, the visual oppression feeling caused by the lower height of the side span sections during driving of the bridge floor is eliminated, and the driving smoothness and the comfort are improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a steel bridge main truss structure for optimizing driving comfort according to an embodiment of the present invention;
fig. 2 is a schematic view of an upper flat coupling structure of a main truss structure of a steel bridge for optimizing driving comfort according to an embodiment of the present invention;
fig. 3 is a schematic view of a lower parallel connection structure of a steel bridge main truss structure for optimizing driving comfort according to an embodiment of the invention;
fig. 4 is a cross-sectional view of an edge span of a main truss structure of a steel bridge for optimizing driving comfort according to an embodiment of the invention;
FIG. 5 is a cross-sectional view of a midspan section of a main truss structure of a steel bridge for optimizing driving comfort, provided by an embodiment of the invention;
FIG. 6 is a cross-sectional view of a steel bridge main truss structure for optimizing driving comfort at a steel truss arch support frame according to an embodiment of the invention;
fig. 7 is a schematic structural diagram of a box-shaped section of a steel bridge main truss structure for optimizing driving comfort according to an embodiment of the invention;
fig. 8 is a schematic structural view of a cross section shaped like a Chinese character 'wang' of a steel bridge main truss structure for optimizing driving comfort according to an embodiment of the present invention.
In the figure:
1. a steel truss arch main truss; 2. a mid-span section; 21. a first upper chord; 22. a first lower chord; 23. a first vertical bar; 24. a second diagonal member; 3. a side span section; 31. a second upper chord; 32. a second lower chord; 33. a second vertical bar; 34. a third diagonal member; 4. upper parallel connection; 41. a first cross member; 42. a first diagonal bar; 5. lower parallel connection; 51. a second cross member; 52. a fourth diagonal member; 6. a steel truss arch support frame; 7. a bridge deck; 8. a sling; 9. a box-shaped cross section; 10. a cross section shaped like a Chinese character 'wang'.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides a steel bridge main truss structure for optimizing driving comfort, which can solve the problem of lower driving comfort at the side span with lower truss height in the related art.
Referring to fig. 1 to 5, a main truss structure of a steel bridge for optimizing driving comfort according to an embodiment of the present invention may include: the steel truss arch main truss structure comprises two steel truss arch main trusses 1 arranged at intervals in the transverse bridge direction, the steel truss arch main trusses 1 can be arranged above a bridge floor 7, each steel truss arch main truss 1 can comprise a middle span section 2 and two side span sections 3, and the two side span sections 3 can be arranged on two opposite sides of the middle span section 2 in the longitudinal bridge direction; the upper flat connection 4 can be arranged between midspan sections 2 of two steel truss arch main trusses 1, one side of the upper flat connection 4 can be fixed with the midspan section 2 of one steel truss arch main truss 1, the other side of the upper flat connection 4 can be fixed with the midspan section 2 of the other steel truss arch main truss 1, the upper flat connection 4 can also be arranged between side span sections 3 of the two steel truss arch main trusses 1, one side of the upper flat connection 4 can be fixed with the side span section 3 of one steel truss arch main truss 1, and the other side of the upper flat connection 4 can be fixed with the side span section 3 of the other steel truss arch main truss 1; the lower parallel connection 5 can be positioned below the upper parallel connection 4, the lower parallel connection 5 can be arranged between midspan sections 2 of two steel truss arch main trusses 1, one side of the lower parallel connection 5 can be fixed with the midspan section 2 of one steel truss arch main truss 1, the other side of the lower parallel connection 5 can be fixed with the midspan section 2 of the other steel truss arch main truss 1, and the lower parallel connection 5 is not arranged between the side span sections 3 of the two steel truss arch main trusses 1, the structural strength can be improved by increasing the cross section size of the rod piece at the corresponding position of the side span section 3 so as to meet the integral stress and stability of the steel bridge main truss structure, therefore, the net height from the rod piece at the lowest position of the side span section 3 to the bridge floor 7 is higher, the visual oppression caused by the lower height of the side span section 3 during traveling of the bridge 7 is eliminated, and the traveling smoothness and the comfort level are improved.
Referring to fig. 2, 4 and 5, in some embodiments, the upper parallel 4 may include: a plurality of first cross beams 41, wherein the plurality of first cross beams 41 can be arranged at intervals along the longitudinal bridge direction, one end of each first cross beam 41 can be fixed with one steel truss arch main truss 1, the other end of each first cross beam 41 can be fixed with the other steel truss arch main truss 1, and the first cross beams 41 can be perpendicular to the steel truss arch main trusses 1; the first oblique rods 42 can be obliquely arranged relative to the first cross beam 41, one end of each first oblique rod 42 can be fixed with the steel truss arch main truss 1, the other end of each first oblique rod 42 can be fixed with the first cross beam 41, the first oblique rods 42, the adjacent first cross beams 41 and the steel truss arch main trusses 1 can form a triangular structure in a surrounding mode, the structure can connect the two steel truss arch main trusses 1, and the stability of the whole steel bridge main truss structure is improved.
Referring to fig. 2, in some embodiments, four first diagonal rods 42 may be connected to one first cross beam 41, and one end of each of the four first diagonal rods 42 may be fixed to a middle position of the one first cross beam 41, the other ends of the four first diagonal rods 42 may be respectively fixed to two steel truss arch main girders 1, the four first diagonal rods 42 may form a cross-shaped structure with the one first cross beam 41, in this embodiment, two first diagonal rods 42 of the four first diagonal rods 42 may be located on one side of the first cross beam 41, the other two first diagonal rods 42 may be located on the other side of the first cross beam 41, and the first diagonal rods 42 on opposite sides of the first cross beam 41 may be symmetrical with respect to the first cross beam 41, and the two first diagonal rods 42 located on the same side of the first cross beam 41 may be symmetrical with respect to a vertical line of the first cross beam 41, which may further increase stability.
Referring to fig. 1 and 6, in some embodiments, the steel bridge main truss structure may further include: the steel truss arch support frame 6 can be supported below the joint of the mid-span section 2 and the side-span section 3, and the steel truss arch support frame 6 can play a good supporting role for a main truss structure of the steel bridge.
Referring to fig. 3 and 5, in some embodiments, the lower parallel 5 may include: the second cross beams 51 can be arranged at intervals along the longitudinal bridge direction, one end of each second cross beam 51 can be fixed to a midspan section 2 of one steel truss arch main truss 1, the other end of each second cross beam 51 can be fixed to a midspan section 2 of the other steel truss arch main truss 1, and each second cross beam 51 can be perpendicular to the midspan section 2.
Referring to fig. 1, 3 and 6, in some embodiments, the steel bridge main truss structure may further include a steel truss arch support frame 6, the lower horizontal connection 5 at the steel truss arch support frame 6 may be disposed below the bridge deck 7, and the lower horizontal connection 5 may further include a plurality of fourth diagonal rods 52, one end of each fourth diagonal rod 52 may be fixed to the steel truss arch support frame 6, the other end of each fourth diagonal rod 52 may be fixed to a second cross beam 51, and the fourth diagonal rods 52 may enclose a triangular structure with the adjacent second cross beam 51 and the steel truss arch support frame 6, which may increase the stability of the steel truss arch support frame 6 structure, and may further increase the supporting capability of the steel truss arch support frame 6.
Referring to fig. 1, in some embodiments, the midspan section 2 may comprise: the first upper chords 21 can be laid along the longitudinal bridge direction, the first upper chords 21 can be connected end to end, and the upper chords can be laid into an arc shape; a plurality of first lower chords 22, the first lower chords 22 may be respectively disposed at one-to-one correspondence intervals with the first upper chords 21, the first lower chords 22 may be disposed below the first upper chords 21, and a distance between the first upper chords 21 and the first lower chords 22 may gradually decrease from two ends of the mid-span 2 toward a middle position of the mid-span 2; one end of each first vertical rod 23 can be fixed with the upper chord, and the other end of each first vertical rod 23 can be fixed with the lower chord; many second down tube 24, many second down tube 24 can set up for first montant 23 slope, the one end of second down tube 24 can be fixed with first upper chord 21, the other end of second down tube 24 can be fixed with first lower chord 22, second down tube 24 can enclose into the triangle-shaped structure with adjacent first montant 23 and first upper chord 21, second down tube 24 can enclose into the triangle-shaped structure with adjacent first montant 23 and first lower chord 22, the structural strength of midspan 2 can be increased to above-mentioned structure, make midspan 2 can bear bigger effort.
Referring to fig. 7 and 8, in some embodiments, the cross section of the first upper chord 21 and the first lower chord 22 may be a box-shaped section 9, and the cross section of the first vertical bar 23 and the second diagonal bar 24 may be a wang-shaped section 10 or a box-shaped section 9, which may further increase the structural strength.
Referring to fig. 1, in some embodiments, the endbay segment 3 may include: a plurality of second upper chords 31, wherein the plurality of second upper chords 31 can be laid along the longitudinal bridge direction, and the plurality of second upper chords 31 can be connected end to end; a plurality of second lower chords 32, the plurality of second lower chords 32 may be respectively arranged in one-to-one correspondence with the plurality of second upper chords 31 at intervals, the second lower chords 32 may be arranged below the second upper chords 31, and a distance between the second upper chords 31 and the second lower chords 32 may gradually increase from one end of the side span 3, which is far away from the mid-span 2, toward one end of the side span 3, which is close to the mid-span 2; one end of each second vertical rod 33 can be fixed with the second upper chord 31, and the other end of each second vertical rod 33 can be fixed with the second lower chord 32; the third inclined rods 34 can be obliquely arranged relative to the second vertical rod 33, one end of each third inclined rod 34 can be fixed to the second upper chord 31, the other end of each third inclined rod 34 can be fixed to the second lower chord 32, each third inclined rod 34 can form a triangular structure with the adjacent second vertical rod 33 and the adjacent second upper chord 31, and each third inclined rod 34 can also form a triangular structure with the adjacent second vertical rod 33 and the adjacent second lower chord 32.
Referring to fig. 1 and 5, in some embodiments, the steel bridge main truss structure may further include: many slings 8, many slings 8 can be followed the longitudinal bridge and set up to the interval, and slings 8 can be perpendicular to bridge floor 7, and steel purlin arch main purlin 1 can be fixed in to slings 8's one end, and the bridge floor 7 can be fixed in to slings 8's the other end, and slings 8's length can shorten gradually from the both ends of midspan 2 towards the intermediate position of midspan 2, can lift bridge floor 7 through setting up slings 8.
The principle of the steel bridge main truss structure for optimizing the driving comfort level provided by the embodiment of the invention is as follows:
because two steel truss arch main trusses 1 can be arranged at intervals along the transverse bridge direction, the steel truss arch main trusses 1 can be arranged above the bridge deck 7, the steel truss arch main trusses 1 can comprise a middle span section 2 and two side span sections 3, the two side span sections 3 can be arranged on two opposite sides of the middle span section 2 along the longitudinal bridge direction, the upper parallel connection 4 can be connected with the middle span section 2 of the two steel truss arch main trusses 1, the upper parallel connection 4 can be connected with the side span sections 3 of the two steel truss arch main trusses 1, the lower parallel connection 5 can be arranged below the upper parallel connection 4, the lower parallel connection 5 can be connected with the middle span section 2 of the two steel truss arch main trusses 1, and the lower parallel connection 5 is not arranged between the side span sections 3 of the two steel truss arch main trusses 1, the structural strength can be improved by increasing the cross section size of the rod at the corresponding position of the side span sections 3, so as to meet the whole stress and stability of the steel bridge main truss structure, therefore, the rod at the lowest position reaches the high height ratio of the span section 7, the visual oppression feeling caused by the lower height of the side span 3 during the driving of the bridge deck 7 is eliminated, and the smoothness and the comfort level of the driving are improved.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The utility model provides an optimize steel bridge main truss structure of driving comfort level which characterized in that, it includes:
the steel truss arch main truss structure comprises two steel truss arch main trusses (1) arranged at intervals in the transverse bridge direction, wherein the steel truss arch main trusses (1) are arranged above a bridge deck (7), each steel truss arch main truss (1) comprises a middle span section (2) and two side span sections (3), and the two side span sections (3) are arranged on two opposite sides of the middle span section (2) in the longitudinal bridge direction;
the upper parallel connection (4) is used for connecting the midspan sections (2) of the two steel truss arch main trusses (1), and the upper parallel connection (4) is used for connecting the side midspan sections (3) of the two steel truss arch main trusses (1);
lower tie (5), it is located go up the below of tie (4), tie (5) are connected two down the midspan section (2) of steel purlin arch main purlin (1), and two do not set up between limit midspan section (3) of steel purlin arch main purlin (1) tie (5) down.
2. A steel bridge main truss structure optimizing ride comfort as claimed in claim 1, wherein the upper parallel joint (4) comprises:
the first cross beams (41) are arranged at intervals along the longitudinal bridge direction, one end of each first cross beam (41) is fixed with one steel truss arch main truss (1), and the other end of each first cross beam (41) is fixed with the other steel truss arch main truss (1);
a plurality of first diagonal rods (42), first diagonal rod (42) for first crossbeam (41) slope sets up, the one end of first diagonal rod (42) with steel purlin encircles main purlin (1) and fixes, the other end of first diagonal rod (42) with first crossbeam (41) are fixed.
3. The steel bridge main truss structure for optimizing driving comfort of claim 2, wherein:
one first crossbeam (41) are connected with four first down tube (42), and four the one end of first down tube (42) all is fixed in one the intermediate position of first crossbeam (41), four the other end of first down tube (42) is fixed in two respectively steel purlin encircles main purlin (1), four first down tube (42) and one first crossbeam (41) form the structure of rice font.
4. The steel bridge main truss structure for optimizing driving comfort of claim 1, wherein the steel bridge main truss structure further comprises:
and the steel truss arch support frame (6) is supported below the joint of the middle span section (2) and the side span section (3).
5. A steel bridge main truss structure optimizing ride comfort as claimed in claim 1, wherein the lower parallel link (5) comprises:
many second crossbeam (51), many second crossbeam (51) are followed the longitudinal bridge and are set up to the interval, the one end and a slice of second crossbeam (51) the midspan section (2) of steel purlin arch main purlin (1) are fixed, the other end and another piece of crossbeam the midspan section (2) of steel purlin arch main purlin (1) are fixed.
6. The steel bridge main truss structure for optimizing driving comfort of claim 5, wherein:
the steel bridge main truss structure further comprises a steel truss arch support frame (6) and is located at the steel truss arch support frame (6), the lower parallel connection (5) is arranged below the bridge floor (7), the lower parallel connection (5) further comprises a plurality of fourth inclined rods (52), one end of each fourth inclined rod (52) is fixed to the steel truss arch support frame (6), and the other end of each fourth inclined rod (52) is fixed to the second cross beam (51).
7. A steel bridge main truss structure optimizing ride comfort as claimed in claim 1, wherein the midspan section (2) comprises:
a plurality of first upper chords (21), wherein the first upper chords (21) are laid along the longitudinal bridge direction;
the first lower chords (22) are respectively arranged in one-to-one correspondence with the first upper chords (21) at intervals, and the distance between the first upper chords (21) and the first lower chords (22) is gradually reduced from two ends of the middle span section (2) to the middle position of the middle span section (2);
one end of each first vertical rod (23) is fixed to the first upper chord (21), and the other end of each first vertical rod (23) is fixed to the first lower chord (22);
many second down tube (24), second down tube (24) for first montant (23) slope sets up, the one end of second down tube (24) with first upper chord (21) are fixed, the other end of second down tube (24) with first lower chord (22) are fixed.
8. The steel bridge main truss structure for optimizing driving comfort of claim 7, wherein:
the cross sections of the first upper chord (21) and the first lower chord (22) are box-shaped sections (9), and the cross sections of the first vertical bar (23) and the second diagonal bar (24) are Wang-shaped sections (10) or box-shaped sections (9).
9. A steel bridge primary truss structure optimizing ride comfort as claimed in claim 1 wherein the side spans (3) comprise:
a plurality of second upper chords (31), wherein the second upper chords (31) are laid along the longitudinal bridge direction;
the second lower chords (32) are respectively arranged in one-to-one correspondence with the second upper chords (31) at intervals, and the distance between the second upper chords (31) and the second lower chords (32) is gradually increased from one end, away from the middle span section (2), of the side span section (3) to one end, close to the middle span section (2), of the side span section (3);
one end of each second vertical rod (33) is fixed with the second upper chord (31), and the other end of each second vertical rod (33) is fixed with the second lower chord (32);
a plurality of third diagonal members (34), third diagonal member (34) for second montant (33) slope sets up, the one end of third diagonal member (34) with second upper chord (31) is fixed, the other end of third diagonal member (34) with second lower chord (32) are fixed.
10. The steel bridge main truss structure for optimizing driving comfort of claim 1, wherein the steel bridge main truss structure further comprises:
many hoist cables (8), many hoist cable (8) are set up to the interval along the longitudinal bridge, hoist cable (8) perpendicular to bridge floor (7), the one end of hoist cable (8) is fixed in steel truss encircles main purlin (1), the other end of hoist cable (8) is fixed in bridge floor (7).
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