CN104612032B - Big across tilting arch bridge pylon cable-stayed bridge - Google Patents
Big across tilting arch bridge pylon cable-stayed bridge Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 239000011150 reinforced concrete Substances 0.000 claims description 11
- 239000000725 suspension Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 14
- 238000002955 isolation Methods 0.000 description 5
- 230000005484 gravity Effects 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 2
- 239000010432 diamond Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed 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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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Abstract
Disclosed by the invention big across tilting arch bridge pylon cable-stayed bridge, including multiple skew cables, long-span cablestayed bridges trend curve bridge tower, first foundation, the second basis and the 3rd basis; Bridge tower is made up of upper cantilever arm and bottom support bracket, and upper cantilever arm tilts to span centre; Bottom support bracket includes the first supporting leg, the second supporting leg, the 3rd supporting leg, and being is rigidly connected lays respectively at first foundation, on the second basis and the 3rd basis; Cross-brace beam it is provided with between first supporting leg and the second supporting leg; The top of every skew cables is longitudinally individually fixed in the 3rd arch on the side of span centre, and bottom is longitudinally individually fixed on the span centre position of bridge; Bridge tower back is provided with dorsal funciculus; Dorsal funciculus top is fixed on the top of the upper cantilever arm of bridge tower, and the bottom of dorsal funciculus is on the 3rd supporting leg being fixed in bridge tower. The present invention effectively reduces height and the cost of cable-stayed bridge, handsome in appearance, and Stability Analysis of Structures on the whole meets the demand of height limiting zone.
Description
Technical Field
The invention relates to the technical field of cable-stayed bridge design, in particular to a large-span inclined arched bridge tower cable-stayed bridge.
Background
The cable-stayed bridge is a relatively mature design scheme, but for a large-span cable-stayed bridge with the length of more than 500 meters, the structural design is relatively single. At present, tower shapes of main towers of common large-span cable-stayed bridges are all H-shaped, diamond-shaped, A-shaped, inverted Y-shaped or single-column-shaped linear towers. See the tower-shaped data of the world's first ten-step cable-stayed bridge:
russian island bridge, country: russia, build time: 2012, main span: 1104 m, tower height: 320.9 m, tower shape: a shape;
sutong bridge, country: china, construction time: in 2008, main span: 1088 meters, tower height: 306 m, tower shape: an inverted Y shape;
oncocheng bridge, country: chinese hong Kong, the construction time is as follows: in 2007, the main span: 1018, tower height: 296 m, tower shape: a single column shape;
east Hubei bridge, the country: china, construction time: in 2010, main span: 926 m, tower height: 242.5 m, tower: diamond shape;
many ro bridges, the country: japan, build time: in 1998, main span: 890 m, tower height: 224.0 m, tower shape: diamond shape;
noman bridge, country: french, build time: in 1998, main span: 856 m, tower height: 202.7 m, tower: an inverted Y shape;
jingyue bridge, the country: china, construction time: in 2010, main span: 816 meters, tower height: 265.5 m, tower: h-shaped;
bridge renchuan, the country: korea, build time: in 2009, main span: 800 m, tower height: 238 m, tower shape: an inverted Y shape;
jinjiao wan bridge, country: russia, build time: 2012, main span: 737 m, tower height: 226.25 m, tower shape: v-shaped;
shanghai bridge, the country: china, construction time: in 2009, main span: 730 m, tower height 216.3 m, tower shape: a chevron shape.
Although the linear cable-stayed bridge conforms to the basic principle of stress balance of the cable-stayed bridge, the linear cable-stayed bridge is monotonous in the area with high landscape requirements, and the landscape effect is limited. Meanwhile, in some height-limited areas, because the common linear bridge tower cannot meet the stress requirement, people have to give up the economic feasibility scheme of a cable-stayed bridge and adopt other bridge types.
Along with the rapid development of national economy, people have higher and higher requirements on bridge design, and have risen from simple traffic functions to scenic requirements, so a cable-stayed bridge system suitable for a large span is urgently needed at present, and on the basis of meeting bridge stress, a completely novel stress system and a completely novel shape are adopted so as to meet the requirements of current construction owners on the height of the bridge and the appearance of the bridge.
Disclosure of Invention
The invention mainly aims to solve the defects of the background technology, and provides a large-span inclined arched bridge tower cable-stayed bridge which can effectively reduce the height and the cost and meet the stress condition of the bridge, so that the large-span inclined arched bridge tower cable-stayed bridge is particularly suitable for being used in height-limited areas or places with higher landscape requirements.
In order to achieve the purpose, the invention provides a large-span inclined arched bridge tower cable-stayed bridge, which comprises a large-span cable-stayed bridge inclined curve bridge tower, a first foundation, a second foundation, a third foundation main span, a side span and a plurality of stay cables, and is characterized in that: the large-span inclined arched bridge tower cable-stayed bridge is provided with two large-span inclined curved bridge towers, each large-span inclined curved bridge tower consists of an upper cantilever and a bottom support, and the upper cantilever is inclined towards the midspan; the bottom support comprises a first leg inclined towards the midspan direction and a second leg inclined towards the back of the midspan direction; a third supporting leg extending in the direction back to the midspan direction is connected to the outer side of the lower part of the second supporting leg; a transverse supporting beam is arranged between the first supporting leg and the second supporting leg; the first support leg, the second support leg and the third support leg of the inclined curve bridge tower of the long-span cable-stayed bridge are respectively positioned on a first foundation, a second foundation and a third foundation; the first supporting leg and the first base, the second supporting leg and the second base and the third supporting leg and the third base are all in rigid connection; the top end of each stay cable is longitudinally fixed on the side surface of the inclined curve pylon of the large-span cable-stayed bridge facing the midspan, and the bottom end of each stay cable is longitudinally fixed on the main span; a back cable is arranged at the back of the inclined curve bridge tower of the large-span cable-stayed bridge; the top end of the back cable is fixed at the top end of the upper cantilever of the bridge tower, and the bottom end of the back cable is fixed on the third supporting leg of the inclined curve bridge tower of the large-span cable-stayed bridge.
Preferably, a triangular support structure or a circular support structure is arranged between the upper part of the transverse support beam and the lower part of the upper cantilever.
Preferably, the third arch is provided with a plurality of stay cable fixing parts from top to bottom towards the edge of the midspan, and the top end of each stay cable is fixed on the side surface of the inclined curved pylon of the large-span cable-stayed bridge facing the midspan through the stay cable fixing parts.
Preferably, an upper cantilever top boss is arranged at the top end of the upper cantilever in a direction opposite to the midspan direction, a back cable top fixing part is arranged on the upper cantilever top boss, and the top end of the back cable is fixed at the top end of the upper cantilever of the bridge tower through the back cable top fixing part.
Preferably, the upper cantilever of the inclined curved pylon of the long-span cable-stayed bridge is of a steel structure or a reinforced concrete structure, and the bottom support is of a steel structure or a reinforced concrete structure.
Preferably, the plurality of stay cables are installed in parallel.
Preferably, the large-span inclined arched bridge tower cable-stayed bridge transversely adopts a single-bridge tower structure, the large-span inclined curved bridge tower is positioned in the transverse center of the main span and the side span, and the two sides of the large-span inclined curved bridge tower of the large-span cable-stayed bridge are single bridge decks.
Preferably, the first support leg, the second support leg and the transverse support beam are formed into a first arch shape; the opening of the first arch is downward; a second arch is arranged between the second supporting leg and the third supporting leg, the opening of the second arch faces downwards, the upper cantilever and the inner side of the bottom support form a third arch, and the opening of the third arch faces towards the midspan.
In the above solution, the curve of the third arch is preferably a catenary, and the catenary formula is as follows:
y＝f(ch(kξ)－1)/(m－1)
wherein,
m: the coefficient of the arch axis; which reflects the magnitude of the curvature of the arch axis. The larger m is, the steeper the curve is at the arch springing, and the higher the quarter point of the curve is;
hyperbolic cosine ch (k ξ) ═ exp (k ξ) + exp (-k ξ))/2
f: rise of arch
ξ：ξ＝2x/L
L: is a span of
x: x-axis coordinate y of the arch: y-axis coordinates of the arch.
The large-span inclined arched bridge tower cable-stayed bridge has the following advantages:
1, a large-span cable-stayed bridge inclined curve bridge tower is adopted in a cable-stayed bridge system, the length of the bridge tower is increased, and the height of the bridge tower is reduced;
2, the stay cables are respectively connected with the inner sides of the inclined curve bridge towers of the main bridge span and the large-span cable-stayed bridge, so that the stable structure of the bridge deck is ensured;
3, setting the back of the inclined curve bridge tower of the large-span cable-stayed bridge as a self-fixing type back cable to form a stable system to balance the tension of the stay cable;
4, the full-bridge design combines together for steel construction and reinforced concrete structure, guarantees building strength, improves the efficiency of construction, controls investment budget simultaneously.
Drawings
FIG. 1 is a schematic view of an inclined curve pylon of a large-span cable-stayed bridge according to the present invention.
FIG. 2 is a schematic view of the cable-stayed bridge of the large-span inclined arched bridge tower of the invention.
Fig. 3 is a partial structural schematic diagram of the present invention.
FIG. 4 is a schematic view of the transverse structure of the midspan part of the cable-stayed bridge of the large-span inclined arched bridge tower according to the invention.
Fig. 5 is a graph of the catenary of a third arch of the present invention.
In the figure: 1-inclined curved pylon of large-span cable-stayed bridge, 2-upper cantilever, 3-bottom support, 4-first support leg, 5-second support leg, 6-third support leg, 7-transverse support beam, 8-first arch, 9-second arch, 10-third arch, 11-triangular support, 12-stay cable fixing piece, 13-upper cantilever top boss, 14-top fixing piece of dorsal cable, 15-bottom fixing piece of dorsal cable, 16-first foundation, 17-second foundation, 18-third foundation, 19-stay cable, 20-dorsal cable, 22-main span, 23-side span, 24-single bridge deck and 25-central isolation zone.
Detailed Description
The embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments, and the embodiments are only examples. While the advantages of the invention will be apparent and readily appreciated by the description.
Example 1: see fig. 1. In the embodiment, the inclined curved bridge tower 1 of the large-span inclined arched bridge tower is arranged in the cable-stayed bridge of the large-span inclined arched bridge tower and consists of an upper cantilever 2 and a bottom support 3.
The upper cantilever 2 of the inclined curve bridge tower 1 of the long-span cable-stayed bridge is preferably made of steel, and is designed by adopting a steel structure, and other high-strength materials can be adopted. The bottom support 3 is made of reinforced concrete. The upper cantilever 2 and the lower support 3 of the embodiment are integrally cast. During construction, the steel structure bottom end of the upper cantilever 2 is connected with the steel bar structure of the bottom support 3 in a welding mode, and then the concrete structure of the bottom support 3 is poured, so that the connection reliability of the upper cantilever 2 and the bottom support 3 is guaranteed.
In this embodiment, a first leg 4, a second leg 5, and a third leg 6 are sequentially disposed below the bottom support 3 from the midspan toward the side span. The first leg 4 extends obliquely towards the midspan direction. The second leg 5 extends obliquely away from the midspan direction. The top end of the third leg 6 is connected with the lower outer side of the second leg 5. The third leg 6 is located on the outermost side of the bottom support 3 and extends away from the midspan direction.
The first supporting leg 4, the second supporting leg 5 and the third supporting leg 6 are located in the same plane and are longitudinally arranged along the inclined curve bridge tower 1 of the large-span cable-stayed bridge. The top end of the first leg 4 meets the top end of the second leg 5 at the top end of the bottom support 3, i.e. the bottom end of the upper cantilever 2.
And a transverse supporting beam 7 is arranged between the middle part of the first supporting leg 4 and the middle part of the second supporting leg 5. The lower part of the first leg 4, the lower part of the second leg 5 and the transverse support beam 7 together form a first arch 8. The first arch 8 inclines back to the midspan direction, and the opening is vertical and downward.
The top end of the third leg 6 is connected with the middle part of the second leg 5. The lower parts of the third leg 6 and the second leg 5 form a second arch 9. The second arch 9 inclines towards the midspan direction, and the opening is vertical downwards.
In this embodiment, the first arch 8 and the second arch 9 have a span ratio of 0.5:1 and a rise ratio of 0.5: 1.
The first arch 8 and the second arch 9 are designed in the embodiment as follows: inclined away from the midspan direction and inclined toward the midspan direction, respectively. The arch curves of the first arch 8 and the second arch 9 can also adopt other curves such as circular arcs, parabolas and the like.
In this embodiment, the upper cantilever 2 and the first leg 4 are located on the midspan side of the whole inclined curved pylon 1 of the large-span cable-stayed bridge and extend out in the midspan direction to form a third arch 10 with an opening facing the midspan direction.
The arch curve of the third arch 10 adopts a catenary, and the formula of the catenary is as follows:
y＝f(ch(kξ)－1)/(m－1)
wherein,
m: the arch axis coefficient reflects the curvature of an arch axis, the larger m is, the steeper the curve is at the arch foot, and the higher the quarter point of the curve is;
hyperbolic cosine ch (k ξ) ═ exp (k ξ) + exp (-k ξ))/2
f: is the rise of the arch;
ξ：ξ＝2x/L；
l: is the span of an arch;
x: x-axis coordinates of the arch; y: y-axis coordinates of the arch; as shown in fig. 5.
The bridge calculates and compares the arch shaft coefficients according to different arch shaft coefficients, comprehensively considers factors such as construction cost, construction difficulty and the like, and determines the value of m to be 1-1.8.
Referring to fig. 1 and 3, in the present embodiment, a plurality of stay cable fixing members 12 for fixing the top ends of the stay cables 19 are disposed at the edge of the third arch 10 formed by the upper boom 2 and the first leg 4. An upper cantilever top boss 13 is arranged at the top end of the upper cantilever 2 in a direction opposite to the midspan direction, and a back cable top end fixing piece 14 for fixing the top end of a back cable 20 is arranged on the upper cantilever top boss 13.
The first leg 4, the second leg 5 and the transverse support beam 7 form a triangular support 11 structure. The triangular support 11 is triangular, and three sides of the triangular support are all designed into a curve structure. The highest vertex angle A of the triangular support 11 is arranged below the bottom end of the upper cantilever 2. The opposite side BC of the vertex angle a is the transverse support beam 7, and the two vertices of this side are points B and C: point B is located in the middle of the first leg 4 and point C is located in the middle of the second leg 5. Two contained sides AB and AC of apex angle A of triangle-shaped 11 structures, be respectively: an AB edge that is closer to the midspan direction and an AC edge that faces away from the midspan direction.
In the specific design, the AB side of the triangular support 11 and the third arch 10 are also designed in a curve structure, and the triangular support 11 and the third arch 10 are designed in an equal width mode. The AB side of the triangular support 11 structure is the same as the curve of the outer side of the lower base, and the equal width design between the triangular support 11 and the outer side of the lower base is also ensured.
In the industry, triangles are common stable structural systems and are used in a large number of engineering structures, such as the arrangement of rods of steel trusses. For the present embodiment, the triangle is the most preferred form. Compared with other polygonal structures, the triangle has the property of shape invariance, which is also the embodiment of triangle stability.
In this embodiment, the inclined curved pylon 1 of the long-span cable-stayed bridge is an inclined structure formed by the third arched portion 10 of the curve as a whole. The third arch 10 is formed by the upper boom 2 and the first leg 4 for mounting the stay cable 19. The upper cantilever 2 is designed in a curve and inclines towards the midspan direction, so that the whole tower height can be reduced. The first leg 4 of the bottom support 3 extends in the midspan direction to ensure the balance of the upper cantilever 2. And the third supporting leg 6 extends out in the midspan direction, so that the balance of the whole large-span cable-stayed bridge inclined curve bridge tower 1 is ensured. The second supporting leg 5 is positioned outside the projection of the upper cantilever 2, so that the balance of the whole large-span cable-stayed bridge inclined curve bridge tower 1 is ensured. The triangular support 11 structure can reduce cost and reduce self weight without affecting the strength of the bottom support 3. The lower first 8 and second 9 arches of the bottom bracket 3 together share the overall forces on the first 4, second 5 and third 6 legs.
Embodiment 2, referring to fig. 2 and 3, this embodiment proposes a large-span inclined arched bridge tower cable-stayed bridge designed by using the inclined curved bridge tower 1 of the large-span cable-stayed bridge described in embodiment 1, and the large-span inclined arched bridge tower cable-stayed bridge comprises: the system comprises a stay cable 19, a large-span cable-stayed bridge inclined curve bridge tower 1, a main span 22, an edge span 23, a first foundation 16, a second foundation 17 and a third foundation 18.
As shown in fig. 2, a main span 22 is arranged between the two inclined curved pylons 1 of the large-span cable-stayed bridge, and two side spans 23 are respectively arranged at the outer sides.
Referring to fig. 2-4, the inclined cable-stayed bridge is provided with two inclined curved bridge towers 1 of the large-span cable-stayed bridge, which are respectively positioned at two sides of the main span 22. The main span 22 and the side span 23 are supported on the inclined curve bridge tower 1 of the large-span cable-stayed bridge at the joint. In this embodiment, the inclined cable-stayed bridge transversely adopts a single-pylon structure, that is, only one inclined curved pylon 1 of the large-span cable-stayed bridge is arranged at the transverse center of one end of the main span 22, and the two transverse sides of the inclined curved pylon 1 of the large-span cable-stayed bridge are single bridge decks 24.
As shown in fig. 3, the inclined curved pylon 1 of the large-span cable-stayed bridge of the present embodiment adopts the inclined curved pylon 1 of the large-span cable-stayed bridge described in embodiment 1, and the first leg 4, the second leg 5, and the third leg 6 of the inclined curved pylon 1 of the large-span cable-stayed bridge are respectively located on the first foundation 16, the second foundation 17, and the third foundation 18.
In this embodiment, the first foundation 16, the second foundation 17 and the third foundation 18 are respectively located at two ends of the main span 22 and are in the form of piles penetrating into the stratum of the river bottom. The first leg 4, the second leg 5 and the third leg 6 of the inclined curve bridge tower 1 of the long-span cable-stayed bridge are respectively positioned on a first foundation 16, a second foundation 17 and a third foundation 18. The first leg 4 and the first foundation 16, and the second leg 5 and the second foundation 17 are all rigidly connected, i.e. they are connected as a whole.
The first leg 4 is rigidly connected with the first foundation 16, and is formed by pouring reinforced concrete. The bottom surface of the first leg 4 is rectangular, the width of the first leg is equal to that of the inclined curve pylon 1 of the large-span cable-stayed bridge, and the length of the first leg is the same as that of the first foundation 16. The first leg 4 is mounted directly on top of the first base 16. The first foundation 16 is a reinforced concrete soil-excavating pile foundation structure, and is a column body as a whole, and a pile foundation structure is arranged at the lower part.
The second support leg 5 is rigidly connected with the second foundation 17, and is formed by pouring reinforced concrete. The bottom surface of the second supporting leg 5 is rectangular, the width of the second supporting leg is equal to that of the inclined curve bridge tower 1 of the large-span cable-stayed bridge, and the length of the second supporting leg is the same as that of the second foundation 17. The second leg 5 is mounted directly on top of the second base 17. Second basis 17 is reinforced concrete and draws native pile foundation structure, wholly is the cylinder. The lower part of the second foundation 17 is a pile foundation structure.
And a structural design is formed between the third supporting leg 6 and the third foundation 18, particularly a bearing platform steel knot. The bottom surface of the third supporting leg 6 is rectangular, the width of the third supporting leg is equal to that of the inclined curve bridge tower 1 of the large-span cable-stayed bridge, and the length of the third supporting leg is the same as that of the third foundation 18. The third leg 6 is directly connected to the top of the third base 18. The third foundation 18 is a reinforced concrete soil pile foundation structure and is a cylinder as a whole. The lower part of the third foundation 18 is a pile foundation construction.
Referring to fig. 1-3, a stay cable fixing member 12 is longitudinally arranged at the edge of the third arch 10 of the inclined curved pylon 1 of the large-span cable-stayed bridge, which is open towards the midspan direction, and is used for fixing the top end of a stay cable 19. The stay cable fixing part 12 is designed for anchoring, and the stay cable fixing part 12 is welded at the edge of the inner side of the third arch 10. The bottom ends of the stay cables 19 are respectively fixed on the bridge at the midspan part along the longitudinal direction. The stay cable 19 is composed of a plurality of stay cables 19 arranged in parallel from top to bottom.
The longitudinal two sides of the inclined curve bridge tower 1 of the large-span cable-stayed bridge are both provided with stay cables, wherein one side close to the middle of the span is provided with a stay cable 19, and the other side back to the middle of the span is provided with a back cable 20. The top end of an upper cantilever 2 of the large-span cable-stayed bridge inclined curve pylon 1 is provided with an upper cantilever top boss 13, and the upper cantilever top boss 13 is provided with a back cable top end fixing piece 14 for fixing the top end of a back cable 20. The third supporting leg 6 of the rigid connection part of the third supporting leg 6 and the third foundation 18 of the large-span cable-stayed bridge inclined curved pylon 1 is provided with a back cable bottom end fixing piece 15, and the bottom end of the back cable 20 is fixed on the back cable bottom end fixing piece 15 in a self-fixing manner. The back cable 20 is a stay cable; or a set of parallel stay cables.
In embodiment 3, this embodiment provides a specific cable-stayed bridge of a large-span inclined arched bridge tower designed by using the inclined curved bridge tower 1 of the large-span cable-stayed bridge. The cable-stayed bridge system has substantially the same structure as in example 2. In the embodiment, due to the limited high requirement of the construction area, the tower top elevation of the inclined curve bridge tower 1 of the large-span cable-stayed bridge must be controlled within 115 meters.
In this embodiment, the upper cantilever 2 of the inclined curved pylon 1 of the long-span cable-stayed bridge has a width of 6 m. The steel structure part of upper portion cantilever 2 is 6 meters width, and the bottom of upper portion cantilever 2 is the top of bottom support 3 and is 6 meters width together. The width of the bottom support 3 is gradually widened from top to bottom as a whole, is equal to the width at the horizontal height, and is uniformly enlarged from 6 meters to 9.5 meters. The widths of a first supporting leg 4, a second supporting leg 5 and a third supporting leg 6 of a support 3 at the bottom of the inclined curve bridge tower 1 of the long-span cable-stayed bridge are all 9.5 meters.
As shown in fig. 1, the third arch 10 formed by the upper cantilever 2 and the first leg 4 of the inclined curved pylon 1 of the large-span cable-stayed bridge is in a catenary shape. The centerline of the third arch 10 conforms to the catenary equation: y ═ f (ch (k ξ) -1)/(m-1). In the above formula, the arch axis coefficient m is calculated when it takes different values.
When the arch axis coefficients are 1, 1.5, 2, 10, 30, 100, and the sagittal ratio (i.e., f/L) is 1/2 and 1/3, respectively, the forces and moments of the third arch 10 are analyzed according to finite element calculation software, resulting in table 1 below. Table 1: maximum bending moment and maximum axial force at catenary vector-to-span ratios (f/L) of 1/2 and 1/3
It can be seen from this that: the stress of the tower tends to be reasonable along with the reduction of the rise-span ratio, and when the rise-span ratio is 0, the bridge tower is a straight tower, and the bridge is a conventional cable-stayed bridge. The efficiency of the dorsal chord is gradually improved as the vector-span ratio is reduced.
In this embodiment, the third arch 10 is designed with a sagittal-span ratio (f/L) of 1/2.
In this embodiment, the lower part of the inclined curved pylon 1 of the large-span cable-stayed bridge is a bottom support 3, a triangular support 11 is arranged inside the bottom support 3, and the lower part is composed of a transverse support beam 7, a first support leg 4, a second support leg 5 and a third support leg 6.
As shown in fig. 1, the top corners of the triangular support 11 are A, B, C, respectively, consisting of three arcs, approximating an equilateral triangle. The AB, AC and BC sides of the triangle ABC are all curves. The side lengths of the straight line distances from the point A to the point B, from the point B to the point C, and from the point C to the point A are all 25 meters. The gravity center of the equilateral triangle ABC is the gravity center of the triangular support 11, and the gravity center is vertically 9 meters away from the bridge deck.
As shown in fig. 3, the lower portion of the bottom bracket 3 is a first leg 4, a second leg 5 and a third leg 6, which are mounted on a first base 16, a second base 17 and a third base 18, respectively. The bottom ends of the first leg 4, the second leg 5 and the third leg 6 are positioned on the same horizontal plane. A first arch 8 is arranged between the first leg 4 and the second leg 5, and a second arch 9 is arranged between the second leg 5 and the third leg 6.
The first arch 8 has a height of 27 meters and a span of 79.2 meters.
The second arch 9 has a height of 10 meters and a span of 56 meters.
The first arch 8 and the second arch 9 are both of circular curve design. The height of the arch is the distance from the top apex of the arch to the centerline of the span.
In the embodiment, a first foundation 16, a second foundation 17 and a third foundation 18 are connected below a support 3 at the bottom of the inclined curve pylon 1 of the large-span cable-stayed bridge in a bearing platform rigid connection mode. The first foundation 16, the second foundation 17, the third foundation 18 and the large-span cable-stayed bridge inclined curve bridge tower 1 integrally form a consolidation system, namely a complete integral structural form.
The generated pulling force of the stayed cable 19 is completely transmitted to the inclined curve bridge tower 1 of the large-span cable-stayed bridge. The large-span cable-stayed bridge inclined curve bridge tower 1 distributes and transmits the borne tension to the first foundation 16 and the second foundation 17. The back of the inclined curve bridge tower 1 of the large-span cable-stayed bridge is stressed as follows: since the back cable 20 is self-fixing on the third leg 6, the pulling force of the back cable 20 is completely taken up by the third foundation 18.
The design is carried out by full-bridge stress analysis to obtain: the length × width × height of the first base 16 is 20 × 9.5 × 3.75 m, the length × width × height of the second base 17 is 15 × 9.5 × 3.00 m, and the length × width × height of the third base 18 is 8.0 × 9.5 × 3.0 m.
As shown in fig. 2, the total length of the main bridge of the inclined cable-stayed bridge is 845.4 m. The length of the main bridge is determined by the length of the main span 22, the length of the two first arches 8 and the length of the two second arches 9. Wherein, the main span 22 is 575 meters, and the design of 56+79.2+575+79.2+56 meters is adopted, namely: the distance between the first leg 4 and the second leg 5 of each large-span cable-stayed bridge inclined curved pylon 1 is 56 meters, the distance between the second leg 5 and the third leg 6 is 79.2 meters, and the distance between the two first legs 4 of the two large-span cable-stayed bridge inclined curved pylons 1 is 575 meters.
The total height of the inclined curve pylon 1 of the large-span cable-stayed bridge is 111.5 meters, and the distance from the top end of the upper cantilever 2 to a single bridge deck 24 of the bridge deck is 90.5 meters. The distance from the bottom end of the first leg 4 to the deck single deck 24 is 21 meters. The bottom end of the upper cantilever 2, i.e. the top end of the bottom abutment 3, is 38 meters from the deck single deck 24.
As shown in fig. 2 and 3, the inclined cable-stayed bridge according to the present embodiment is a slant cable-stayed bridge, the third arch 10 and the main span 22 of the slant curve bridge tower 1 of the large-span cable-stayed bridge are connected by a plurality of groups of parallel stay cables 19, and the back of the slant curve bridge tower 1 of the large-span cable-stayed bridge is further provided with a back cable 20.
As shown in fig. 2 to 4, the side surface of the third arch 10 near the midspan is provided with a stay cable fixing member 12 at the same horizontal height near the two side edges, respectively, and the stay cable fixing members are used for fixing the top end of a stay cable 19. The bottom ends of the two stay cables 19 are fixed to the main span 22. The bottom ends of the stay cables 19 sequentially form two straight lines along the longitudinal direction. Between these two lines is a central isolation region 25.
An upper cantilever top boss 13 is arranged at one side of the top end of the upper cantilever 2, which is back to the midspan. And a back cable top end fixing piece 14 is arranged on the upper cantilever top boss 13. The back cable top end fixing piece 14 is used for connecting the top end of the back cable 20. The bottom end of the back cable 20 is fixed on the third supporting leg 6 by a self-fixing mode and a back cable bottom end fixing piece 15.
As shown in fig. 4, the present embodiment is a tilt cable-stayed bridge. The transverse width of the main span 22 position is 49 meters, namely: one deck 24 is 19 meters and a central isolation zone 25 of 11 meters is between two decks 24. The specific area divisions of a single deck 24 are shown in table 2:
table 2: single bridge deck transverse dividing area
| Railing | 0.5 m |
| Slow walking path | 7 m |
| Anti-collision wall | 0.5 m |
| Anti-collision wall | 0.5 m |
| Lane for traffic | 3 × 3.5.5 m |
| Totaling: width of single width bridge floor | 19 m |
The side span 23 part of the inclined cable-stayed bridge is provided with an approach bridge. The initial section of the approach is again provided as two single deck sections 24 and a central isolation zone 25. In the middle section of the approach bridge, the width of the central isolation area 25 is gradually reduced, and the widths of the two single bridge decks 24 are unchanged.
According to the inclined cable-stayed bridge provided by the invention, the inclined curve bridge tower 1 of the large-span cable-stayed bridge adopts a curve structure, so that the regional height limit requirement is met and the landscape requirement of the ground is also considered. The inclined cable-stayed bridge designed by the invention considers the mechanical structure and the engineering structure at the same time, and effectively balances and accepts or rejects actual requirements and engineering budget. The inclined cable-stayed bridge has attractive design and firm construction and meets the requirements of the area.
The inclined cable-stayed bridge embodied by the invention is described above.
Other parts not described in detail are known in the art.
Claims (9)
1. Stride slope arch bridge tower cable-stay bridge greatly, including striding cable-stay bridge slope curve bridge tower (1), first basis (16), second basis (17), third basis (18), many suspension cable (19) main span (22) and side span (23), its characterized in that: the large-span inclined arched bridge tower cable-stayed bridge is provided with two large-span inclined curved bridge towers (1), each large-span inclined curved bridge tower (1) consists of an upper cantilever (2) and a bottom support (3), and each upper cantilever (2) inclines towards the midspan; the bottom support (3) comprises a first leg (4) inclined towards the midspan direction and a second leg (5) inclined away from the midspan direction; the outer side of the lower part of the second leg (5) is connected with a third leg (6) extending in the midspan direction; a transverse supporting beam (7) is arranged between the first supporting leg (4) and the second supporting leg (5); the first supporting leg (4), the second supporting leg (5) and the third supporting leg (6) of the large-span cable-stayed bridge inclined curve bridge tower (1) are respectively positioned on a first foundation (16), a second foundation (17) and a third foundation (18); the first leg (4) and the first foundation (16), the second leg (5) and the second foundation (17), and the third leg (6) and the third foundation (18) are all rigidly connected; the top end of each stay cable (19) is respectively fixed on the side surface of the inclined curve bridge tower (1) of the large-span cable-stayed bridge facing the midspan along the longitudinal direction, and the bottom end of each stay cable is respectively fixed on the main span (22) along the longitudinal direction; a back cable (20) is arranged at the back of the inclined curve bridge tower (1) of the large-span cable-stayed bridge; the top end of the back cable (20) is fixed at the top end of the upper cantilever (2) of the bridge tower, and the bottom end of the back cable (20) is fixed on the third supporting leg (6) of the inclined curve bridge tower (1) of the large-span cable-stayed bridge.
2. The large-span inclined arched bridge pylon of claim 1, wherein: a triangular support (11) structure or a circular support structure is arranged between the upper part of the transverse support beam (7) and the lower part of the upper cantilever (2).
3. The large-span inclined arched bridge pylon of claim 1, wherein: and a plurality of stay cable fixing pieces (12) are arranged on the edge of the third arch (10) facing the midspan from top to bottom, and the top end of each stay cable (19) is respectively fixed on the side face of the inclined curve pylon (1) of the large-span cable-stayed bridge facing the midspan through the stay cable fixing pieces (12).
4. The large-span inclined arched bridge pylon of claim 1, wherein: the top end of the upper cantilever (2) is provided with an upper cantilever top boss (13) in a direction away from the midspan, a back cable top fixing part (14) is arranged on the upper cantilever top boss (13), and the top end of the back cable (20) is fixed to the top end of the upper cantilever (2) of the bridge tower through the back cable top fixing part (14).
5. The large-span inclined arched bridge pylon of claim 1, wherein: the upper cantilever (2) of the large-span cable-stayed bridge inclined curve bridge tower (1) is of a steel structure or a reinforced concrete structure, and the bottom support (3) is of a steel structure or a reinforced concrete structure.
6. The large-span inclined arched bridge pylon of claim 1, wherein: the plurality of stay cables (19) are arranged in parallel.
7. The large-span inclined arched bridge pylon of claim 1, wherein: the large-span inclined arched bridge tower cable-stayed bridge transversely adopts a single-bridge tower structure, the large-span inclined curved bridge tower (1) is positioned in the transverse center of the main span (22) and the side span (23), and the two sides of the large-span inclined curved bridge tower (1) are provided with single bridge decks (24).
8. The large-span inclined arched bridge pylon cable-stayed bridge according to any one of claims 1 to 7, wherein: a first arch (8) is formed among the first supporting leg (4), the second supporting leg (5) and the transverse supporting beam (7); the opening of the first arch (8) faces downwards; be second arch (9) between second landing leg (5) and third landing leg (6), second arch (9) opening down, upper portion cantilever (2) and bottom support (3) the inboard third arch (10) of constituting, third arch (10) opening towards stride the centre.
9. The large-span inclined arched bridge pylon of claim 8, wherein: the curve of the third arch (10) is a catenary, and the catenary formula is as follows:
y＝f(ch(kξ)－1)/(m－1)
wherein,
m: the coefficient of the arch axis;
hyperbolic cosine ch (k ξ) ═ exp (k ξ) + exp (-k ξ))/2
f: is the rise of the arch;
ξ：ξ＝2x/L；
l: is the span of an arch;
x: x-axis coordinates of the arch; y: y-axis coordinates of the arch.
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| CN105442448A (en) * | 2015-11-19 | 2016-03-30 | 马玉荣 | Bridge stabilizing device |
| CN109763417B (en) * | 2019-01-31 | 2020-11-10 | 同济大学建筑设计研究院(集团)有限公司 | Cable-stayed steel truss cooperative system bridge |
| CN112048986A (en) * | 2020-08-13 | 2020-12-08 | 中铁大桥勘测设计院集团有限公司 | Inclined arch tower cable-stayed bridge |
| CN113789851B (en) | 2021-09-26 | 2022-09-13 | 浙大城市学院 | Arc-shaped cantilever truss stay cable bearing combined long-span corridor structure and construction method |
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| FR2797893A1 (en) * | 1999-08-24 | 2001-03-02 | Freyssinet Int Stup | METHOD FOR CONSTRUCTING A HAUBANE BRIDGE |
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| KR100969005B1 (en) * | 2009-11-06 | 2010-07-09 | 동아대학교 산학협력단 | Constructing method of suspension bridge and temporary cable therefor |
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| FR2797893A1 (en) * | 1999-08-24 | 2001-03-02 | Freyssinet Int Stup | METHOD FOR CONSTRUCTING A HAUBANE BRIDGE |
| KR20070083452A (en) * | 2007-01-08 | 2007-08-24 | 인코포레이티드 어드미니스트러티브 에이전시 퍼블릭 웍스 리서치 인스티튜트 | Single suspension girder and double girder combined use suspension bridge |
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