CN115538285A - Rigid cable-stayed bridge and pushing construction method - Google Patents
Rigid cable-stayed bridge and pushing construction method Download PDFInfo
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- CN115538285A CN115538285A CN202110728932.8A CN202110728932A CN115538285A CN 115538285 A CN115538285 A CN 115538285A CN 202110728932 A CN202110728932 A CN 202110728932A CN 115538285 A CN115538285 A CN 115538285A
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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
- 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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
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Abstract
The invention relates to a rigid cable-stayed bridge and a pushing construction method, which comprises a rigid cable-stayed bridge framework formed by steel longitudinal beams (1), a steel bridge tower (2), steel diagonal members (3), steel secondary longitudinal beams (7) and steel cross beams (8), wherein piers (5) are poured on the surface of a ground line (12) between roadbed (11), a support (4) is arranged at the top ends of the piers (5), and a bridge abutment (6) is arranged at the contact part of the roadbed (11) and the steel longitudinal beams (1); a steel cross beam (8) is arranged between the steel longitudinal beams (1); a secondary longitudinal beam (7) is arranged in the middle of the steel cross beam (8); open profiled steel plates (9) are arranged on the top surfaces of the steel cross beam (8) and the steel secondary longitudinal beam (7), and concrete bridge decks (10) are poured on the open profiled steel plates (9). The invention has the beneficial effects that: the method has the advantages of being capable of being assembled quickly, simultaneously pushing, being capable of sealing the bridge surface and bottom for construction, having limited influence on the navigation river channel and the passing road under the bridge, being short in construction period, simple in construction process and clear in member stress.
Description
Technical Field
The invention belongs to the technical field of cable-stayed bridge structures and construction methods thereof, and particularly relates to a rigid cable-stayed bridge and a pushing construction method.
Background
The cable-stayed bridge is a guy cable system, has larger spanning capability than a beam bridge, is the most main bridge type of a large-span bridge, and is widely applied to highway and railway engineering spanning mountains, rivers, local traffic and the like.
The cable-stayed bridge belongs to a high-order statically indeterminate structure, and the adopted construction method and installation procedure are closely related to the linearity and the constant-load internal force of the main bridge after the bridge is formed. The flexible cable-stayed bridge mainly adopts a cantilever casting or cantilever assembly scheme of firstly placing a tower and then placing a beam, namely, symmetrically casting and forging main beam concrete on two sides of a tower column by using hanging basket cantilevers, or firstly casting or assembling an initial beam section of a section of rotary hoisting equipment on a tower column section, and then symmetrically assembling beam bodies in sequence from two sides of the tower column by using proper hoisting equipment; and a construction scheme of firstly girder and secondly tower is adopted for part of small spans, namely temporary piers are firstly arranged, the main span is converted into a pushing span, after the main girder is prefabricated and pushed in place, a cable tower, a hanging cable, tensioning and dismantling the temporary piers are poured, and the system conversion process from the continuous girder to the cable-stayed bridge is completed.
The flexible cable-stayed bridge structure system and the construction method of cantilever casting or cantilever assembling and beam-first and tower-second are complex, the preparation period of each component is long, the structural system conversion is more in the construction process, and the linearity and internal force control of the construction process and the bridge forming state are difficult, so that a rigid cable-stayed bridge which adopts integral pushing and is clear in stress can be sought.
Disclosure of Invention
The invention aims to solve the problems of long member preparation period, influence on structures under a bridge, complex construction process, difficult control of bridge formation linearity and internal force and the like of a flexible cable-stayed bridge cantilever pouring or cantilever assembling and beam-first-tower-second construction scheme in the background technology, and provides a rigid cable-stayed bridge and a pushing construction method, wherein the rigid cable-stayed bridge has the advantages of simple structure, more reasonable design, capability of realizing rapid assembling, simultaneous pushing, construction capable of sealing the bridge floor, limited influence on navigation channels and passing roads under the bridge, short construction period, simple construction process and definite member stress.
In order to achieve the purpose, the invention adopts the following technical scheme:
a rigid cable-stayed bridge comprises a rigid cable-stayed bridge framework formed by steel longitudinal beams 1, steel bridge towers 2, steel diagonal draw bars 3, steel secondary longitudinal beams 7 and steel cross beams 8, wherein the framework can move longitudinally after a pushing device is arranged on the surface of a roadbed 11, the vertically arranged steel bridge towers 2 are welded with the steel longitudinal beams 1 at the supporting positions of piers 5, the steel diagonal draw bars 3 are arranged at the positions of two sides of the steel bridge towers 2 at certain distances and are welded with the steel longitudinal beams 1 and the steel bridge towers 2, piers 5 which are used for pushing construction and supporting the steel framework after bridging are poured on the surface of a ground line 12 between the roadbeds 11 arranged at the two ends, supports 4 used for supporting the steel longitudinal beams 1 are fixedly arranged at the top ends of the piers 5, and bridge abutments 6 for supporting the rigid cable-stayed bridge framework are arranged at the contact positions of the roadbeds 11 arranged at the two sides and the steel longitudinal beams 1; steel cross beams 8 vertical to the steel longitudinal beams 1 are uniformly arranged between the steel longitudinal beams 1; a secondary longitudinal beam 7 with an I-shaped section is vertically arranged in the middle of the steel cross beam 8; and fixed opening profiled steel plates 9 are arranged on the top surfaces of the steel cross beam 8 and the steel secondary longitudinal beam 7, and concrete bridge deck plates 10 are poured on the opening profiled steel plates 9.
A pushing construction method of a rigid cable-stayed bridge comprises the following steps:
1) A rigid cable-stayed bridge framework composed of steel longitudinal beams 1, a steel bridge tower 2, steel diagonal members 3, steel secondary longitudinal beams 7 and steel cross beams 8 is pushed out from the surface of a roadbed 11 to the direction of the abutment 6 by taking the abutment 6 and the roadbed 11 as pushing first supporting points.
2) After the framework of the rigid cable-stayed bridge is pushed forwards through the pier 5, the pier 5 is used as a second pushing supporting point, and the rigid cable-stayed bridge is continuously pushed towards the midspan direction.
3) When the rigid cable-stayed bridge is pushed forward until the axes of the steel bridge tower 2 and the bridge pier 5 are overlapped, the rigid cable-stayed bridge is pushed in place, and the midspan closure segments are connected to form a continuous system.
The general relationship between the rods of the rigid cable-stayed bridge skeleton is as follows: l2= (0.85-1) L1, L3= (0.3-0.5) L1, H = (0.48-0.58) L1, each component stress is relatively better under the proportional relation, and the material utilization rate is higher, wherein: l1 is the length of a steel longitudinal beam between the steel bridge tower and the steel diagonal member; l2 is the span length of the steel longitudinal beam between the steel diagonal draw bars; l3 is the length of a cantilever at the end part of the side span steel longitudinal beam; h is the height of the steel bridge tower.
Compared with the prior art, the invention has the beneficial effects that: firstly, the rigid cable-stayed bridge framework component is made of steel, the steel component is not limited by a site and is not influenced by the construction period of a substructure, and the processing and manufacturing period of the component is shortened. Secondly, the pushing construction efficiency is high, the construction period is greatly shortened, the process is simple, the bridge forming line is easy to control, and the stress of the construction and bridge forming state components is definite. And thirdly, the open profiled steel sheet, the steel longitudinal beams and the steel cross beams form a bridge floor construction space with a closed bottom surface, so that structures and the like under the bridge cannot be influenced, and particularly, the influence on navigation channels and passing roads is avoided. Fourthly, the rigid cable-stayed bridge adopts a light high-strength steel structure, has outstanding earthquake-resistant performance and has great advantages in high-intensity earthquake areas.
Drawings
FIG. 1 is an elevation view of a rigid cable-stayed bridge according to the present invention;
FIG. 2 is a plan view of a deck system of a rigid cable-stayed bridge according to the present invention;
FIG. 3 is a sectional view of the combination of open channel profiled steel sheets and concrete decking;
FIG. 4 is a schematic process diagram of a incremental launching method for a rigid cable-stayed bridge;
fig. 5 is a main flow chart of a rigid cable-stayed bridge pushing construction method.
In the figure: the steel bridge comprises a steel longitudinal beam 1, a steel bridge tower 2, steel diagonal draw bars 3, a support 4, a pier 5, a bridge abutment 6, a steel secondary longitudinal beam 7, a steel cross beam 8, an open profiled steel plate 9, a concrete bridge deck 10, a roadbed 11, a ground line 12, a steel longitudinal beam length L1 between the steel bridge tower and the steel diagonal draw bars, a steel longitudinal beam mid-span length L2 between the steel diagonal draw bars, a side-span steel longitudinal beam end cantilever length L3 and a steel bridge tower height H.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1 and 4, the rigid cable-stayed bridge comprises a framework of a rigid cable-stayed bridge consisting of steel longitudinal beams 1, steel bridge towers 2, steel diagonal draw bars 3, steel secondary longitudinal beams 7 and steel transverse beams 8, and specifically comprises the steel longitudinal beams 1 which are longitudinally arranged on the surfaces of roadbeds 11 at two ends, adopt uniform-section box-shaped cross sections, and can longitudinally move after being provided with thrusters on the surfaces of the roadbeds 11, the steel bridge towers 2 are vertically and fixedly arranged on the surfaces of the steel longitudinal beams 1 symmetrically arranged at two ends, the steel diagonal draw bars 3 are fixedly arranged at certain distances at two sides of the steel bridge towers 2, piers 5 for supporting the steel longitudinal beams 1, the steel bridge towers 2 and the steel diagonal draw bars 3 after jacking construction and bridging are poured on the surface of a ground line 12 between the roadbeds 11 arranged at two ends, supports 4 for placing the steel longitudinal beams 1 are fixedly arranged at the top ends of the piers 5, and a bridge abutment 6 for supporting the framework of the rigid cable-stayed bridge is arranged at the contact part of the roadbeds 11 arranged at two ends and the steel longitudinal beams 1; steel beams 8 are uniformly and fixedly arranged perpendicular to the steel longitudinal beams 1, open profiled steel plates 9 are fixedly arranged between the steel beams 8, and concrete bridge decks 10 are poured between the open profiled steel plates 9 and the steel beams 8; a secondary longitudinal beam 7 with an I-shaped section is fixedly arranged on the bottom surface of the steel cross beam 8 and is parallel to the steel longitudinal beam 1. The steel longitudinal beam 1, the steel bridge tower 2 and the steel diagonal draw bar 3 are connected by full welding to form a rigid cable-stayed bridge framework; the support 4, the pier 5 and the abutment 6 are cast in place or installed to form a supporting point for pushing construction; the steel longitudinal beam 1 adopts a box-shaped section with a uniform section, can adopt steel plates for splicing and welding, and can also adopt rectangular section steel sections for splicing and lengthening; the steel bridge tower 2 and the steel diagonal draw bars 3 generally adopt linear variable-section box-shaped sections, namely, the joints with the steel longitudinal beams 1 adopt large sections, adopt small sections towards the top of the tower, and are formed by splicing and welding steel plates; the bridge piers 5 and the bridge abutments 6 are generally formed by concrete cast-in-place; the support 4 is generally a large-tonnage spherical steel support.
The steel cross beam 8 is connected with the steel longitudinal beam 1 and the secondary longitudinal beam 7 in a welding mode to form a bridge deck skeleton; the open profiled steel sheet 9 is anchored by adopting shear nails and welded on the steel beam 8 as a template for cast-in-situ construction of the concrete bridge deck 10; the secondary longitudinal beam 7 adopts a short welding I-shaped section; the middle of the steel cross beam 8 adopts a welded I-shaped section, and the end part and the pier top adopt a box-shaped section with a uniform section; the opening direction of the open profiled steel sheet 9 is a transverse bridge direction; the thickness of the concrete bridge deck 10 is between 24 and 30 cm; the ground line 12 is a river channel and a beach contour line.
A pushing construction method of a rigid cable-stayed bridge comprises the following steps:
1) Pushing a framework of a rigid cable-stayed bridge consisting of steel longitudinal beams 1, a steel bridge tower 2, steel diagonal members 3, steel secondary longitudinal beams 7 and steel cross beams 8 out from the surface of a roadbed 11 to the direction of the abutment 6 by taking the abutment 6 and the roadbed 11 as first pushing supporting points;
2) Pushing the framework of the rigid cable-stayed bridge forwards through a pier 5, taking the pier 5 as a second pushing supporting point, and continuing to push in the midspan direction;
3) When the rigid cable-stayed bridge is pushed forward until the axes of the steel bridge tower 2 and the bridge pier 5 are overlapped, the rigid cable-stayed bridge is pushed in place, and the midspan closure segments are connected to form a continuous system.
The general relations among the length L1 of the steel longitudinal beam between the steel bridge tower and the steel diagonal draw bars, the span length L2 of the steel longitudinal beam between the steel diagonal draw bars, the cantilever length L3 at the end part of the side span steel longitudinal beam and the height H of the steel bridge tower are as follows:
L2＝(0.85～1)L1、L3＝(0.3～0.5)L1、H＝(0.48～0.58)L1。
as shown in fig. 2, the steel longitudinal beam 1, the secondary longitudinal beam 7, the steel cross beam 8, the open profiled steel sheet 9 and the concrete deck slab 10 form a bridge deck system; the steel beam 8 is connected with the steel longitudinal beam 1 and the secondary longitudinal beam 7 in a welding mode to form a bridge deck skeleton, and the open profiled steel sheet 9 is fixed and welded on the steel beam 8 by adopting a shear nail anchor and serves as a template for cast-in-place construction of the concrete bridge deck 10; the secondary longitudinal beams 7 adopt shorter welding I-shaped cross sections and are used for strengthening the robustness of the bridge deck system and preventing the concrete bridge deck 10 from collapsing and deforming in the cast-in-place process, the number of the secondary longitudinal beams can be set according to the width of the bridge deck, and the distance between the secondary longitudinal beams and the steel longitudinal beams 1 is generally controlled to be about 2 times that between the steel cross beams 8; the middle steel cross beam 8 of the bridge span is generally welded with an I-shaped cross section, the end part of the bridge span and the top of a bridge pier are box-shaped cross sections with equal cross sections, the distance between the box-shaped cross beams is generally about 3-6 m, and when the distance is larger, the steel cross beams 8 with different heights can be arranged in the middle part at intervals.
As shown in fig. 3, the open profiled steel sheet 9 and the concrete deck 10 constitute a roadway plate. The opening direction of the opening profiled steel sheet 9 is a transverse bridge direction, the thickness of the concrete bridge deck 10 is determined according to different traffic loads and the distance between the steel cross beams 8, the thickness is generally between 24 and 30cm, horizontal bidirectional reinforcing steel bars are arranged on the top layer and the bottom layer, and after the design strength requirement is met, an asphalt concrete surface layer is laid on the top layer and the bottom layer.
Fig. 5 shows a main flowchart of a pushing construction method of a rigid cable-stayed bridge according to the present invention.
The invention relates to a rigid cable-stayed bridge and a pushing construction method, wherein skeleton members are made of steel, the processing and the manufacturing are not limited by fields, all the members can be welded and assembled at a bridge position, and can also be directly transported to the bridge position after being welded and formed in a steel mill, and the construction is not influenced by piers 5, abutment 6 and roadbeds 11, and can be synchronously carried out; the steel longitudinal beam 1, the steel bridge tower 2, the steel diagonal draw bar 3, the steel secondary longitudinal beam 7 and the steel cross beam 8 form a framework of a rigid cable-stayed bridge, a self-stabilizing system is formed, and the requirement of the bidirectional bending performance of the cross section during conversion of systems such as a single cantilever, a simple support and the like can be met in the pushing process; the open profiled steel sheet 9 welded on the steel cross beam 8 is used as a template for cast-in-place construction of the concrete bridge deck 10, and the open profiled steel sheet and the steel longitudinal beam 1 can be used as a bridge side protective guard to form a construction space with a closed bridge deck bottom, so that structures and the like under a bridge cannot be influenced, and especially influence on navigation river channels and passing roads is avoided.
In conclusion, the rigid cable-stayed bridge and the pushing construction method realize the bridge structure crossing navigation channels and passing roads and the construction scheme which can be quickly assembled and simultaneously pushed and the bridge deck is constructed in a closed manner, greatly shorten the construction period and the construction influence and have higher technical, economic and social benefits.
Meanwhile, the above embodiments of the rigid cable-stayed bridge and the pushing construction method disclosed by the present invention are suitable for the present invention, but the embodiments of the present invention are not limited by the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be regarded as equivalent substitutions and alterations which are included in the protection scope of the present invention.
Claims (4)
1. A rigid cable-stayed bridge, characterized in that: the cable-stayed bridge comprises a rigid cable-stayed bridge framework formed by steel longitudinal beams (1), steel bridge towers (2), steel diagonal rods (3), steel secondary longitudinal beams (7) and steel cross beams (8), wherein the framework can longitudinally move after a pushing device is arranged on the surface of a roadbed (11), the vertically arranged steel bridge towers (2) are welded with the steel longitudinal beams (1) at the supporting positions of piers (5), the steel diagonal rods (3) and the steel longitudinal beams (1) and the steel bridge towers (2) are arranged at certain distances at two sides of the steel bridge towers (2), the piers (5) for supporting the steel framework after pushing construction and bridging are poured on the surface of a ground line (12) between the roadbeds (11) arranged at two ends, supports (4) for supporting the steel longitudinal beams (1) are fixedly arranged at the top ends of the piers (5), and bridge abutments (6) for supporting the rigid cable-stayed bridge framework are arranged at the contact positions of the roadbeds (11) arranged at two sides and the steel longitudinal beams (1); steel cross beams (8) vertical to the steel longitudinal beams (1) are uniformly arranged between the steel longitudinal beams (1); a secondary longitudinal beam (7) with an I-shaped section is vertically arranged in the middle of the steel cross beam (8); and the top surfaces of the steel cross beam (8) and the steel secondary longitudinal beam (7) are provided with fixed open profiled steel plates (9), and concrete bridge deck plates (10) are poured on the open profiled steel plates (9).
2. A rigid cable-stayed bridge according to claim 1, characterized in that: the steel cross beam (8) adopts a box-shaped section structure at the end part of the bridge body and the top of the pier, and other bridge body parts adopt an I-shaped section structure.
3. A rigid cable-stayed bridge and a pushing construction method according to claims 1-2, characterized in that: the method comprises the following steps:
the method comprises the following steps that 1) a framework of a rigid cable-stayed bridge consisting of steel longitudinal beams (1), a steel bridge tower (2), steel diagonal members (3), steel secondary longitudinal beams (7) and steel cross beams (8) is pushed out from the surface of a roadbed (11) to the direction of the abutment (6) by taking the abutment (6) and the roadbed (11) as pushing first supporting points;
2) After a framework of the rigid cable-stayed bridge is pushed forwards to pass through a pier (5), the pier (5) is taken as a second pushing supporting point, and the rigid cable-stayed bridge is continuously pushed towards the midspan direction;
3) When the rigid cable-stayed bridge is pushed forward until the axes of the steel bridge tower (2) and the bridge pier (5) are overlapped, namely the rigid cable-stayed bridge is pushed in place, and the midspan closure sections are connected to form a continuous system;
4) And paving an open profiled steel sheet (9) between the steel cross beam (8) and the steel secondary longitudinal beam (7) of the bridge deck, and pouring a concrete bridge deck (10).
4. A rigid cable-stayed bridge and pushing construction method according to claim 3, characterized in that: in the step (1), the steel longitudinal beam (1), the steel bridge tower (2) and the steel diagonal draw bar (3) are arranged in the following position relations: l2= (0.85 to 1) L1, L3= (0.3 to 0.5) L1, H = (0.48 to 0.58) L1;
wherein: l1 is the length of a steel longitudinal beam between the steel bridge tower and the steel diagonal member; l2 is the span length of the steel longitudinal beam between the steel diagonal draw bars; l3, the cantilever length of the end part of the side span steel longitudinal beam; h is the height of the steel bridge tower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110728932.8A CN115538285A (en) | 2021-06-29 | 2021-06-29 | Rigid cable-stayed bridge and pushing construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110728932.8A CN115538285A (en) | 2021-06-29 | 2021-06-29 | Rigid cable-stayed bridge and pushing construction method |
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| Publication Number | Publication Date |
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| CN115538285A true CN115538285A (en) | 2022-12-30 |
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| CN202110728932.8A Pending CN115538285A (en) | 2021-06-29 | 2021-06-29 | Rigid cable-stayed bridge and pushing construction method |
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- 2021-06-29 CN CN202110728932.8A patent/CN115538285A/en active Pending
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