CN114657880A - String-tensioning and suspension cable combined type pedestrian bridge formed by space cables and construction method thereof - Google Patents
String-tensioning and suspension cable combined type pedestrian bridge formed by space cables and construction method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 claims description 26
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- 239000004567 concrete Substances 0.000 claims description 17
- 239000011435 rock Substances 0.000 claims description 15
- 238000004873 anchoring Methods 0.000 claims description 13
- 238000013461 design Methods 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D12/00—Bridges characterised by a combination of structures not covered as a whole by a single one of groups E01D2/00 - E01D11/00
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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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- 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
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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Abstract
The invention discloses a tension string and suspension cable combined type pedestrian bridge formed by space cables and a construction method thereof. The anchorage foundations are distributed on two sides of the bridge; the tower pier foundation is arranged among the bridge spans, and when the number of the bridge spans is N, the number of the tower pier foundation is N-1; the longitudinal beam is formed by splicing a main beam, a main longitudinal beam, a secondary longitudinal beam and a secondary beam at each span; a plurality of main cables are arranged in parallel at different heights on two sides of the bridge and are arranged along the longitudinal direction of the bridge; the middle of the main cable penetrates through the tower pier foundation, and the two sides of the main cable are anchored on the anchorage foundation; the main cable is in a catenary line shape at any span, is positioned below the longitudinal beam in the span length range far away from the tower pier foundation, and forms a string structure system with the longitudinal beam and the transverse beam; the main cable is positioned above the longitudinal beam in the range close to the foundation of the tower pier, and forms a suspension cable supporting system with the longitudinal beam and the transverse beam. The bridge deck of the bridge has high rigidity, torsion resistance and wind resistance stability. Meanwhile, the bridge is flexible in span and quick in construction.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a string-stretching and suspension cable combined type pedestrian bridge formed by space cables and a construction method thereof.
Background
In recent years, with the vigorous development of the ecological tourism industry, the expansion of scenic spot lines and the improvement of facility quality become more and more important. In numerous amusement facilities, the cross-valley glass trestle becomes an important mark of most tourist attraction at present by the characteristics of ambitious modeling and strong sightseeing experience. Due to uniqueness of landscape, flexible suspension bridges with strong spanning capability are widely used for mountain-valley-spanning bridges. However, due to the characteristics of small rigidity and large span-width ratio of the bridge deck, the bridge is very sensitive to the action of wind load, and auxiliary technical measures are needed to ensure the wind-resistant bearing capacity and stability of the bridge; in addition, the suspension cable supporting system is not suitable for the continuous span-laying terrain condition, and the bridge towers and the anchors on the two sides have higher requirements on site selection. Therefore, the research and development of a bridge type with better wind resistance and wider applicability to meet the design requirements of diversified pedestrian bridges in scenic spots is urgently needed.
The string structure belongs to an unconventional cable supporting system of an upper beam lower cable, and the main structure of the string structure consists of a rigid upper string structure, a flexible lower string cable and a vertical stay bar for connecting the two structures. The string-stretching structure is mainly applied to a large-span space net rack and a roof structure since birth, but the application in a bridge is very limited, mainly because the inverted arch shape of the string-stretching structure occupies a part of space under the bridge, and the navigation or the traffic under the bridge is hindered.
Disclosure of Invention
In order to solve the problems of weak wind resistance and inflexible structural arrangement of the traditional flexible cable bridge, and in consideration of the design requirement of no-bridge clearance of a pedestrian bridge in a scenic spot, the invention integrates a string-stretching structure system into the design of the flexible cable bridge, and provides a string-stretching and suspension cable combined pedestrian bridge formed by space cables and a construction method thereof, wherein the bridge arranges main cables on two sides of the width of a bridge floor to form the space cables, so that the linear stress requirement of the main cables is met, the main cables are arranged more possibly, and the combination of the string-stretching structure and the suspension cable structure is formed on a structural system; and the bridge deck can be smoothly and conveniently improved in walking comfort level, the assembly construction can be realized, and a structural form with convenient construction and excellent performance is provided for the design of the pedestrian bridge in the mountainous area.
The purpose of the invention is realized by the following technical scheme:
a string-tensioning and suspension cable combined type pedestrian bridge formed by a space cable comprises five parts, namely an anchor foundation, a tower pier foundation, longitudinal and transverse beams, a main cable and a cable beam connecting piece; the anchorage foundations are distributed on two sides of the bridge; the tower pier foundation is arranged among the bridge spans, and when the number of the bridge spans is N, the number of the tower pier foundation is N-1; the longitudinal beam is formed by splicing a main beam, a main longitudinal beam, a secondary longitudinal beam and a secondary beam at each span; the main cables are arranged in parallel at different heights on two sides of the bridge and are arranged along the longitudinal direction of the bridge; the middle of the main cable penetrates through the tower pier foundation, and two sides of the main cable are anchored on the anchorage foundation; the main cable is in a catenary line shape at any span, is positioned below the longitudinal beam in a span length range far away from the tower pier foundation, and forms a string structure system with the longitudinal beam and the transverse beam; the main cable is located above the longitudinal and transverse beams in the range close to the foundation of the tower pier, and forms a suspension cable supporting system with the longitudinal and transverse beams.
Furthermore, the anchorage foundation consists of a cast-in-place concrete structure and a prestressed anchor cable, and a main cable guide pipe and an anchoring device are pre-buried in the cast-in-place reinforced concrete structure; one side of the prestressed anchor cable is embedded in the cast-in-place concrete structure, and the other side of the prestressed anchor cable is embedded in the rock; the tower pier foundation in the middle is of a cast-in-place concrete structure, and a main cable guide pipe is embedded in the tower pier foundation; the main cable guide pipe in the anchor foundation and the main cable guide pipe in the tower pier foundation are used for the main cable to pass through; and the main cable guide pipe is subjected to grouting and anchor sealing treatment after the main cable is tensioned.
Furthermore, the longitudinal and transverse beams are formed by splicing I-shaped steel and comprise main cross beams, main longitudinal beams, secondary cross beams and secondary longitudinal beams; the relative primary and secondary and lap joint mode between each component of the longitudinal and transverse beams is as follows: the main longitudinal beam is lapped on the main cross beam, the secondary cross beam is lapped on the main longitudinal beam, and the secondary longitudinal beam is lapped on the secondary cross beam; the overlapped member is continuous at the overlapping portion, and the overlapping member is broken at the overlapping portion.
Furthermore, the main cables adopt steel strand bundles with hexagonal sections, the number of the main cables on each side of the bridge and the number of the steel strand bundles of each main cable are adjusted according to the stress characteristics, and each steel strand is provided with an independent anti-corrosion sleeve.
Furthermore, the cable beam connecting piece consists of an extension arm, a cable clamp and a screw rod; the extension arms are special-shaped I-shaped steel and are spliced with the main cross beam of the longitudinal cross beam; the orientation of the outrigger depends on the position relationship between the longitudinal beam and the main cable: when the height of the cross section centroid of the longitudinal and transverse beams is lower than that of the main cable, the extending arm faces upwards; when the height of the cross section centroid of the longitudinal and transverse beams is higher than that of the main cable, the extending arm faces downwards; the single cable clamp is formed by splicing two opposite special-shaped steel plates, a hexagonal hole is formed in the middle of the single cable clamp after splicing, and the main cable penetrates through the hexagonal hole and is fastened through a bolt; two ends of the cable clamp are respectively arranged on one screw rod, and the end part of the screw rod is fixed on the extending arm; on the same extending arm, the number of the cable clamps is the same as that of the main cables, and the cable clamps are uniformly arranged along the height direction.
A construction method of the string-tensioning and suspension cable combined type pedestrian bridge formed by the space cables comprises the following steps:
the method comprises the following steps: constructing a foundation;
excavating a covering layer and rocks at a foundation position, flattening the surface and exposing the surface of the intact rocks; pre-burying the prestressed anchor cable in a rock stratum and grouting, and performing an anti-pulling test on the prestressed anchor cable after the grouting strength reaches a design value to ensure that the strength meets the standard requirement; binding reinforcing steel bars of the anchor foundation and the tower pier foundation, arranging embedded parts, and pouring concrete; after the strength of the anchorage foundation concrete reaches 95%, tensioning, anchoring, grouting and sealing the prestressed anchor cable;
step two: installing a main cable;
measuring the distance between anchor foundations and determining the length of the main cable; the guide rope is drawn and fixed on the rocks on both sides; applying a guide cable to guide a main cable to an opposite bank, tensioning the main cable to a design value of cable force in a construction stage, adjusting the position of the main cable, and anchoring the main cable on the basis of the anchorage;
step three: the cable beam connecting piece and the main cross beam are arranged;
prefabricating all parts of the steel members of the cable beam connecting piece and the longitudinal beam in advance and conveying the steel members to a construction site; installing the cable clamp at each hoisting point of the main cable; splicing the extending arm and the main cross beam, and then fixing the extending arm and the main cross beam on the cable clamp through the screw;
step four: the main longitudinal beam, the secondary cross beam and the secondary longitudinal beam are installed;
the main longitudinal beams, the secondary transverse beams and the secondary longitudinal beams of all the sections of the longitudinal transverse beams are symmetrically installed one by taking the tower pier foundation as an axis;
step five: linear adjustment and anchor sealing construction of a main cable;
after the construction of the bridge deck auxiliary project is finished, the linear shape of the main cable is adjusted through secondary tensioning of the main cable to enable the main cable to reach a design state, and finally, the main cable is subjected to anchoring treatment in main cable guide pipes in anchor foundations and tower pier foundations.
Further, all the prefabricated steel members in the third step and the fourth step are connected by adopting bolts or welding.
The invention has the following beneficial effects:
the invention integrates a string structure and suspension cable structure combined system formed by space cables into a flexible cable bridge design, and provides a novel combined cable support system bridge type capable of being constructed in an assembling manner, so that the cable distribution space is enlarged, the bridge deck rigidity and torsion resistance of the cable bridge can be effectively increased, and the wind resistance stability is improved; secondly, the structure system has the advantage of more flexible span distribution and can adapt to diversified site design conditions; finally, the assembly type construction method provided by the invention can effectively reduce the construction difficulty of the bridge in the mountainous area, accelerate the construction progress and save the construction cost.
Drawings
Fig. 1 is an elevation view of a string-tensioning and suspension cable combined type pedestrian bridge formed by the space cable of the invention.
Fig. 2 is a plan view of a string-tensioning and suspension cable combined type footbridge formed by the space cable of the invention.
Fig. 3 is an elevation view of an anchorage foundation structure of a tension string and suspension cable combined type pedestrian bridge formed by the space cable.
Fig. 4 is an elevation view of a tower pier foundation structure of a tension string and suspension cable combined type passenger bridge formed by the space cable.
Fig. 5 is a three-dimensional schematic diagram of the structure of the transverse and longitudinal beams of the upper sections of the outriggers of the combined suspension cable pedestrian bridge formed by the space cable.
Fig. 6 is a three-dimensional schematic view of the structure of the boom down-segment longitudinal and transverse beams of the space cable-formed suspension cable combined pedestrian bridge of the invention.
Fig. 7 is a partial structural view of a general cable beam connecting member of a combined string and suspension cable type passenger bridge formed by the space cable of the present invention.
Fig. 8 is a partial structural view of a special cable beam connecting piece of a tension string and suspension cable combined type passenger bridge formed by the space cable.
Fig. 9 is a construction step diagram of a string-tensioning and suspension cable combined type pedestrian bridge formed by the space cable of the invention.
The numbering in the drawings is explained as follows: 1. an anchorage foundation; 2. a tower pier foundation; 3. a longitudinal beam; 4. a main cable; 5. a cable-beam connection; 101. a cast-in-place concrete structure; 102. an anchor cable; 301. a main cross beam; 302. a main stringer; 303. a secondary cross beam; 304. a secondary stringer; 501. extending the arm; 502. a cable clamp; 503. a screw.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments, and the objects and effects of the present invention will become more apparent, it being understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
In the description of the embodiments of the present invention, if an orientation description is referred to, for example, "upper", "lower", "left", "right", "front", "rear", etc., based on an orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but does not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in figures 1 and 2, the tension string and suspension cable combined type pedestrian bridge formed by the space cable comprises five parts, namely an anchor foundation 1, a tower pier foundation 2, a longitudinal and transverse beam 3, a main cable 4 and a cable beam connecting piece 5. The anchorage foundations 1 are distributed on two sides of the bridge, and the tower pier foundation 2 is positioned between the left span and the right span of the bridge; the longitudinal beam 3 is formed by splicing a plurality of main beams at equal intervals and a plurality of secondary beams at the back of each span, and the length of the longitudinal beam at the left span is n1X L, the length of the right-span longitudinal beam is n2X L; a plurality of main cables 4 are arranged in parallel at different cross section heights on two sides of the bridge, and the main cables are used for fixing anchoring points at the anchor foundation 1 and the tower pier foundation 2 according to the designed vertical span ratio and are in a catenary shape at any span; the main cable 4 is arranged along the full length of the bridge, namely the middle of the main cable 4 penetrates through the tower pier foundation 2, and the two sides of the main cable are anchored on the anchorage foundation 1; the main cable 4 is arranged on the left side d of the tower pier foundation 21Range and tower right side d2The main cables are positioned above the longitudinal beam 3 in the range, and the main cables in the other span ranges are positioned below the longitudinal beam 3.
As shown in fig. 3, the anchor foundations 1 on both sides are composed of a cast-in-place concrete structure 101 and anchor cables 102, and main cable guide pipes and anchoring devices are pre-buried in the cast-in-place concrete structure 101; the anchor cable 102 is embedded inside the cast-in-place concrete structure 101 on one side and on the other side on the rock. As shown in fig. 4, the middle tower column foundation 2 is made of cast-in-place concrete, and the main cable guide pipe is also embedded inside. The main cable guide pipe is used for the main cable 4 to pass through; and after the main cable 4 is tensioned, grouting and anchoring treatment is carried out in the main cable guide pipe.
Fig. 5 shows the three-dimensional structure of the longitudinal beam of the upper section of the cantilever, which is represented by the fact that the longitudinal beam 3 is horizontally arranged below the cable beam connector 5 and the main cable 4, and the structure is suitable for the longitudinal beam close to the foundation of the tower pier; fig. 6 shows the three-dimensional structure of the longitudinal beam of the boom down section, which is represented by the horizontal height of the longitudinal beam 3 above the cable beam connector 5 and the main cable 4, and the structure is suitable for the longitudinal beam of the far tower pier foundation. In each segment, the longitudinal and transverse beams 3 are formed by splicing i-beams, and comprise a main cross beam 301, a main longitudinal beam 302, a secondary cross beam 303 and a secondary longitudinal beam 304. The relative primary and secondary and lap joint mode between each component of the longitudinal and transverse beams is as follows: the main longitudinal beam 302 is overlapped on the main transverse beam 301, the secondary transverse beam 303 is overlapped on the main longitudinal beam 304, and the secondary longitudinal beam 304 is overlapped on the secondary transverse beam 303. The overlapped member is continuous at the overlapping portion, and the overlapping member is broken at the overlapping portion.
FIG. 7 is a partial configuration view of a typical girder connection suitable for use with longitudinal and transverse girders of generally booms up-section and booms down-section; fig. 8 is a partial structural view of a special cable-beam connector, which is suitable for the cable-beam connector with the cross section height of the longitudinal beam and the main cable crossed. The main beam is connected with a main cable 4 through a height-adjustable cable beam connecting piece 5. The cable beam connecting piece 5 is composed of an extension arm 501, a cable clamp 502 and a screw 503. The extending arm 501 is made of deformed I-steel and is spliced with the main beam 301. The cable clip 502 is made of cast steel, and a single cable clip 502 is formed by splicing two opposite profiled steel plates, and a hexagonal hole is formed in the middle; the main cable 4 adopts a steel strand bundle with a hexagonal section, and the section of the steel strand bundle is slightly smaller than the aperture of the cable clamp 502; the cable clamp 502 fastens the main cable 4 through a bolt and is fixed on the cantilever 501 through 4 threaded rods 503 made of Q235 hot-rolled threaded round steel; on the same boom, the number of the cable clamps 502 is the same as the number of the main cables 4, and the cable clamps are uniformly arranged in the height direction.
Referring to fig. 9, the construction method of the tension string and suspension cable combined type pedestrian bridge formed by the space cable provided by the invention comprises the following steps:
the method comprises the following steps: and (5) foundation construction. Excavating a covering layer and rocks at a foundation position, flattening the surface and exposing the surface of the intact rocks; pre-burying the prestressed anchor cable 102 in the rock stratum and grouting, and performing an anti-pulling test on the prestressed anchor cable 102 after the grouting strength reaches a design value to ensure that the strength meets the standard requirement; binding reinforcing steel bars of the anchor foundation 1 and the tower pier foundation 2, arranging embedded parts, and pouring concrete; and after the strength of the concrete of the anchorage foundation 1 reaches 95%, tensioning, anchoring, grouting and sealing the prestressed anchor cable 102.
Step two: and (7) installing a main cable. Measuring the distance between the anchors and determining the length of the main cable 4; the guide cable is pulled and fixed on the rocks on both sides; and (3) applying the guide cable to guide the main cable 4 to the opposite bank, tensioning the main cable 4 to a designed cable force value in the construction stage, adjusting the position of the main cable 4, and anchoring the main cable on the anchorage foundation 1.
Step three: and the cable beam connecting piece and the main cross beam are installed. Pre-manufacturing steel components of each part of the cable beam connecting piece 5 and the longitudinal and transverse beams 3 in advance and conveying the steel components to a construction site; installing cable clamps 502 at each hoisting point of the main cable 4; the boom 501 is spliced with the beam 301 and then fixed to the cable clamp 502 by the screw 503.
Step four: and the main longitudinal beam, the secondary cross beam and the secondary longitudinal beam are installed. And the main longitudinal beam 302, the secondary transverse beam 303 and the secondary longitudinal beam 304 of each section of the longitudinal and transverse beams are symmetrically arranged one by taking the tower pier foundation as a middle shaft.
Step five: and (5) linear adjustment and anchor sealing construction of the main cable. After the construction of the auxiliary engineering of the bridge deck is finished, the line shape of the structure is adjusted through secondary tension of the main cable 4 to enable the main cable to reach a design state, and finally, the part of the main cable 4 in the basic guide pipe is sealed and anchored.
And connecting all the prefabricated steel members in the third step and the fourth step by bolts or welding.
The string-stretching and suspension cable combined type pedestrian bridge formed by the space cables enriches the structural form of the cable-supported bridge, and provides an effective solution for designing and building the pedestrian bridge under the complex mountain area site condition.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the invention and is not intended to limit the invention to the particular forms disclosed, and that modifications may be made, or equivalents may be substituted for elements thereof, while remaining within the scope of the claims that follow. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A string-tensioning and suspension cable combined type pedestrian bridge formed by a space cable is characterized by comprising five parts, namely an anchor foundation, a tower pier foundation, a longitudinal beam, a main cable and a cable beam connecting piece; the anchorage foundations are distributed on two sides of the bridge; the tower pier foundation is arranged among the bridge spans, and when the number of the bridge spans is N, the number of the tower pier foundation is N-1; the longitudinal beam is formed by splicing a main beam, a main longitudinal beam, a secondary longitudinal beam and a secondary beam at each span; the main cables are arranged in parallel at different heights on two sides of the bridge and are arranged along the longitudinal direction of the bridge; the middle of the main cable penetrates through the tower pier foundation, and two sides of the main cable are anchored on the anchorage foundation; the main cable is in a catenary line shape at any span, is positioned below the longitudinal beam in a span length range far away from the tower pier foundation, and forms a string structure system with the longitudinal beam and the transverse beam; the main cable is located above the longitudinal and transverse beams in the range close to the foundation of the tower pier, and forms a suspension cable supporting system with the longitudinal and transverse beams.
2. The tension string and suspension cable combined type pedestrian bridge formed by the space cable according to claim 1, wherein the anchor foundation is composed of a cast-in-place concrete structure and a prestressed anchor cable, and a main cable guide pipe and an anchoring device are embedded in the cast-in-place reinforced concrete structure; one side of the prestressed anchor cable is embedded in the cast-in-place concrete structure, and the other side of the prestressed anchor cable is embedded in the rock; the tower pier foundation in the middle is of a cast-in-place concrete structure, and a main cable guide pipe is embedded in the tower pier foundation; the main cable guide pipe in the anchor foundation and the main cable guide pipe in the tower pier foundation are used for the main cable to pass through; and the main cable guide pipe is subjected to grouting and anchor sealing treatment after the main cable is tensioned.
3. The truss string and suspension cable combined type pedestrian bridge formed by the space cables according to claim 2, characterized in that the longitudinal and transverse beams are formed by splicing I-shaped steel and comprise main cross beams, main longitudinal beams, secondary cross beams and secondary longitudinal beams; the relative primary and secondary and lap joint mode between each component of the longitudinal and transverse beams is as follows: the main longitudinal beam is lapped on the main cross beam, the secondary cross beam is lapped on the main longitudinal beam, and the secondary longitudinal beam is lapped on the secondary cross beam; the overlapped member is continuous at the overlapping portion, and the overlapping member is broken at the overlapping portion.
4. The string-opening and suspension cable combined type pedestrian bridge formed by the space cables according to claim 3, wherein the main cables are steel strand bundles with hexagonal sections, the number of the main cables on each side of the bridge and the number of the steel strand bundles of each main cable are adjusted according to stress characteristics, and each steel strand is provided with an independent anti-corrosion sleeve.
5. The string-tensioning and suspension cable combined type pedestrian bridge formed by the space cables according to claim 4, characterized in that the cable-beam connecting piece consists of an extension arm, a cable clamp and a screw rod; the extension arms are special-shaped I-shaped steel and are spliced with the main cross beam of the longitudinal cross beam; the orientation of the outrigger depends on the position relationship between the longitudinal beam and the main cable: when the height of the cross section centroid of the longitudinal and transverse beams is lower than that of the main cable, the extending arm faces upwards; when the height of the cross section centroid of the longitudinal and transverse beams is higher than that of the main cable, the extending arm faces downwards; the single cable clamp is formed by splicing two opposite-oriented special-shaped steel plates, a hexagonal hole is formed in the middle of the single cable clamp after splicing, and the main cable penetrates through the hexagonal hole and is fastened through a bolt; two ends of the cable clamp are respectively arranged on one screw rod, and the end part of the screw rod is fixed on the extending arm; on the same extending arm, the number of the cable clamps is the same as that of the main cables, and the cable clamps are uniformly arranged along the height direction.
6. A construction method of a string-tensioning and suspension cable combined type foot bridge formed by the space cable according to claim 5 is characterized by comprising the following steps:
the method comprises the following steps: constructing a foundation;
excavating a covering layer and rocks at a foundation position, flattening the surface and exposing the surface of the intact rocks; pre-burying the prestressed anchor cable in a rock stratum and grouting, and performing an anti-pulling test on the prestressed anchor cable after the grouting strength reaches a design value to ensure that the strength meets the standard requirement; binding reinforcing steel bars of the anchor foundation and the tower pier foundation, arranging embedded parts, and pouring concrete; after the strength of the anchorage foundation concrete reaches 95%, tensioning, anchoring, grouting and sealing the prestressed anchor cable;
step two: installing a main cable;
measuring the distance between anchor foundations and determining the length of the main cable; the guide cable is pulled and fixed on the rocks on both sides; applying a guide cable to guide a main cable to an opposite bank, tensioning the main cable to a designed cable force value in a construction stage, adjusting the position of the main cable, and anchoring the main cable on the foundation of the anchorage;
step three: the cable beam connecting piece and the main cross beam are arranged;
prefabricating all steel components of the cable beam connecting piece and the longitudinal beam in advance and conveying the steel components to a construction site; installing the cable clamp at each hoisting point of the main cable; splicing the extending arm with the main cross beam, and then fixing the extending arm on the cable clamp through the screw;
step four: the main longitudinal beam, the secondary cross beam and the secondary longitudinal beam are installed;
the main longitudinal beams, the secondary transverse beams and the secondary longitudinal beams of all the sections of the longitudinal transverse beams are symmetrically installed one by taking the tower pier foundation as an axis;
step five: linear adjustment and anchor sealing construction of a main cable;
after the construction of the bridge deck auxiliary project is finished, the linear shape of the main cable is adjusted through secondary tensioning of the main cable to enable the main cable to reach a design state, and finally, the main cable is subjected to anchoring treatment in main cable guide pipes in anchor foundations and tower pier foundations.
7. The construction method of the truss string and span wire combined type pedestrian bridge formed by the space cables according to claim 6, wherein all the prefabricated steel members in the third step and the fourth step are connected by bolts or welding.
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| CN202210279346.4A CN114657880B (en) | 2022-03-21 | 2022-03-21 | String and suspension cable combined pedestrian bridge formed by space cables and construction method thereof |
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| CN202210279346.4A CN114657880B (en) | 2022-03-21 | 2022-03-21 | String and suspension cable combined pedestrian bridge formed by space cables and construction method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11323839A (en) * | 1998-05-19 | 1999-11-26 | Shinko Kosen Kogyo Kk | Girder connecting method for suspended structure |
| CN206752292U (en) * | 2017-03-22 | 2017-12-15 | 中国矿业大学(北京) | One kind provides prestressed tension string beam structure using deadweight |
| CN111485493A (en) * | 2020-03-25 | 2020-08-04 | 中国电建集团中南勘测设计研究院有限公司 | Suspension bridge anchorage structure and implementation method thereof |
| CN113174829A (en) * | 2021-05-13 | 2021-07-27 | 中交第二公路勘察设计研究院有限公司 | Through-type suspension bridge structure |
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2022
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| JPH11323839A (en) * | 1998-05-19 | 1999-11-26 | Shinko Kosen Kogyo Kk | Girder connecting method for suspended structure |
| CN206752292U (en) * | 2017-03-22 | 2017-12-15 | 中国矿业大学(北京) | One kind provides prestressed tension string beam structure using deadweight |
| CN111485493A (en) * | 2020-03-25 | 2020-08-04 | 中国电建集团中南勘测设计研究院有限公司 | Suspension bridge anchorage structure and implementation method thereof |
| CN113174829A (en) * | 2021-05-13 | 2021-07-27 | 中交第二公路勘察设计研究院有限公司 | Through-type suspension bridge structure |
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| Title |
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| 董伟伟;王炜龙;: "山区人行悬索桥抗风稳定性技术措施", 中国新技术新产品, no. 03, 10 February 2020 (2020-02-10) * |
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