CN113135508A - Single-side light hoisting equipment suitable for rear cantilever arm of composite-section beam bridge and construction method - Google Patents
Single-side light hoisting equipment suitable for rear cantilever arm of composite-section beam bridge and construction method Download PDFInfo
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- CN113135508A CN113135508A CN202110553242.3A CN202110553242A CN113135508A CN 113135508 A CN113135508 A CN 113135508A CN 202110553242 A CN202110553242 A CN 202110553242A CN 113135508 A CN113135508 A CN 113135508A
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- hoisting
- anchoring
- cantilever arm
- longitudinal beam
- bridge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
- B66C23/42—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with jibs of adjustable configuration, e.g. foldable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/64—Jibs
- B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
- B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/62—Constructional features or details
- B66C23/84—Slewing gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/88—Safety gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C9/00—Travelling gear incorporated in or fitted to trolleys or cranes
- B66C9/14—Trolley or crane travel drives
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses light hoisting equipment and a construction method, which are suitable for assembling composite section beam cantilevers. The hoisting equipment mainly comprises a rotating system, a hoisting system, a supporting and anchoring system and a bridge deck traveling system. The rotating system is fixed on the core longitudinal beam through the anchoring system, the prefabricated cantilever arms are hoisted to one side of the composite section segmental beam bridge through the hoisting system, temporary prestress tensioning is carried out, and after hoisting of the cantilever arms on two sides is completed, the cantilever arms are moved to the next segmental through the bridge floor traveling system, and hoisting is continued. Light-duty hoisting equipment simple structure, the anchor is convenient, and the arm hoist and mount are picked in prefabrication of accomplishing both sides in proper order to accessible rotating system accomplishes to improve hoisting equipment turnover efficiency, reduction of erection time.
Description
The technical field is as follows:
the invention belongs to the technical field of bridge construction, particularly relates to single-side light hoisting equipment suitable for a rear cantilever arm of a composite-section beam bridge and a construction method, and belongs to the technical field of traffic engineering.
Background art:
aiming at the characteristics that the bridge is firstly assembled with the prefabricated core box girder and then assembled with the prefabricated cantilever arm, a bridge transverse subsection prefabrication and assembly method which has excellent stress performance, simple and reasonable structure and rapid and convenient construction and a walking hoisting device suitable for the assembly method need to be provided.
At present, the longitudinal splicing process of the prefabricated segmental beam is mature, and hoisting equipment commonly used in engineering is also mostly applied to hoisting of longitudinal bridge segments. In addition, common hoisting equipment can only hoist in a single direction, and hoisting work of the double-side prefabricated cantilever arm in the project is difficult to realize; although the gantry type hoisting equipment can be used for bilateral hoisting, the equipment scale is large. Therefore, when the transverse segment assembly is realized, the light, convenient, safe and stable hoisting equipment can be ensured, and the problems to be researched and solved are solved.
The invention content is as follows:
aiming at the problems existing in the assembling construction of the existing transverse prefabricated sections, the invention provides light hoisting equipment suitable for single-side hoisting of the transverse sections, and the accurate splicing between the prefabricated cantilever arm and the core longitudinal beam can be realized. The hoisting equipment has small scale and is convenient to install and use; when the prefabricated cantilever arm is hoisted, the anchoring device between the support pedestal and the core longitudinal beam and the anchoring cable between the hoisting equipment and the embedded temporary anchoring block can ensure the safety and stability of the hoisting process; further, hoisting of the opposite prefabricated cantilever arm can be completed through the rotating system, temporary prestress is tensioned, at the moment, the joint concrete does not need to be waited for reaching the strength, hoisting equipment is pushed to the next section, and hoisting is continued; thereby greatly improving the turnover efficiency of the equipment and shortening the construction period.
In order to realize the functions, the main technical scheme of the invention is as follows: the single-side light hoisting equipment and the construction method are suitable for the rear cantilever arm of the composite section beam bridge.
The hoisting equipment and the construction method are based on a composite section segmental beam system, and are characterized by comprising a built core longitudinal beam section, a prefabricated cantilever arm, a pre-embedded temporary anchoring block, temporary prestress and a support bracket.
The single-side light hoisting equipment suitable for the rear-mounted cantilever arm of the composite-section beam bridge comprises a rotating system, a hoisting system, a bridge deck walking system and a supporting and anchoring system; the rotating system is fixed on the core longitudinal beam through the supporting anchoring system, the hoisting system is fixed on the rotating system and hoists the prefabricated arm through the sling, after the arms are hoisted on the two sides and hoisted, the hoisting equipment moves forwards through the bridge floor traveling system.
And the rotating system and the turntable are fixed on the supporting system and connected with the hoisting system. When the prefabricated cantilever arm is hoisted, the suspension arm is rotated to the transverse bridge direction through the turntable for hoisting; when the bridge floor of the hoisting equipment travels, the suspension arm is shortened and rotated to the longitudinal direction of the bridge and moved to the next segment.
The hoisting system comprises a telescopic boom, a winch and a hoisting cross beam. The pulley block at the top end of the suspension arm supports a hoisting steel wire rope to hoist a heavy object, and the suspension arm is stretched or the angle is changed to carry out accurate positioning; and the lower end of the steel wire rope of the winch is connected with a hoisting crossbeam for suspending, assembling and prefabricating the cantilever arm. The selection of the hoisting points must ensure that the prefabricated cantilever arm does not rotate, tilt or overturn after being hoisted, preferably, 4 hoisting points are arranged on the prefabricated cantilever arm, wherein the hoisting points can be arranged at the position of 1/4 cantilever arms along the bridge direction, and the hoisting points are symmetrically arranged along the bridge direction according to the gravity center position of the cantilever arm.
The bridge deck traveling system comprises a sliding seat, two traveling rails, a longitudinal pushing oil cylinder and a left-right buckling device, wherein the two traveling rails are laid in the middle of a core longitudinal beam along the bridge direction; the rail is arranged in the middle of the core longitudinal beam, a sliding seat matched with the rail is arranged on the rail, the front end of the longitudinal pushing oil cylinder is propped against the sliding seat, and the rear end of the longitudinal pushing oil cylinder is hinged to the rail; the upper part of the left-hand thread mechanism is arranged on the supporting and anchoring system through a pin shaft, and the lower part of the left-hand thread mechanism is contacted with the outer side of the flange of the track through a roller wheel, so that the hoisting equipment is prevented from overturning when moving forwards.
The supporting and anchoring system comprises a supporting pedestal, an anchoring device, an anchoring cable and a pre-buried temporary anchoring block. The support pedestal is fixed on a fixed lug seat of the core longitudinal beam through an anchoring device; the supporting pedestal is fixed on the fixing lug seat of the core longitudinal beam through an anchoring device, preferably, the anchoring device is a pin shaft system convenient to install and remove, the upper end of the anchoring device is connected with the supporting pedestal through a pin shaft, and the lower end of the anchoring device is connected with the fixing lug seat of the core longitudinal beam through a pin shaft; during hoisting, the hoisting equipment is anchored to the embedded temporary anchoring blocks by the anchoring cables to prevent side turning.
The pre-buried temporary anchoring block is simultaneously applied to anchoring of hoisting equipment and tensioning of temporary prestress. The arrangement form of the temporary prestress can be 1, 2 or more, and preferably, a double-root prestress form can be adopted; the anchoring cable anchors the lifting device to an existing anchoring block, preferably the anchoring cable will be anchored to two different anchoring blocks. The two embedded temporary anchoring blocks on the prefabricated cantilever arm are symmetrical along the bridge direction about the center line of a rib plate of the cantilever arm, the distance from the center line is 1/4, the cantilever arm is long along the bridge direction, and the distance from the seam along the bridge direction is 1/3-1/2, and the transverse bridge direction cantilever arm is wide; two anchoring blocks on the core longitudinal beam are symmetrical along the bridge direction about the center line of the cantilever rib plate, the distance from the center line of the rib plate is 1/4, the cantilever is long along the bridge direction, and the transverse bridge direction is positioned above the web plate of the core longitudinal beam.
The invention relates to a construction method suitable for a post-installed cantilever arm of a composite-section segmental beam bridge, which comprises the following steps:
and a, erecting and assembling the core longitudinal beam of the main section by the bridge girder erection machine, completing forward movement, and erecting cantilever arm hoisting equipment on the core longitudinal beam. b, when the prefabricated cantilever arm is hoisted, hoisting equipment is fixed on the core longitudinal beam through the supporting anchoring system, and the suspension arm hoisting device is used for hoisting the prefabricated cantilever arm
The arm is hoisted to one side of the composite section beam bridge, and the position of the cantilever arm is adjusted through the length change of the suspension arm or the rotation of the inclination angle, so that the accurate positioning and installation are realized; and keeping suspension, and performing temporary prestress tensioning on the prefabricated cantilever arm and the core longitudinal beam. c, completing the temporary prestress tensioning of the prefabricated cantilever arm and the core longitudinal beam on one side, removing the hoisting suspension, and dismantling the hoisting equipment and the core
Embedding anchor cables between the temporary anchor blocks on the longitudinal beams; and rotating the suspension arm and re-anchoring to hoist the opposite prefabricated cantilever arm. d, the prefabricated cantilever arms at the two sides of the segment complete temporary prestress tensioning, and the joint concrete does not need to wait for reaching the strength at the moment and is relieved
The anchoring device, the anchoring cable and a longitudinal pushing oil cylinder of the bridge floor traveling system push the sliding seat, so that the hoisting equipment moves forwards; and moving to the next section cantilever arm hoisting position, and re-fixing the hoisting equipment to the core longitudinal beam through the anchoring system and the anchoring cable to carry out next round of hoisting.
The invention has the advantages that:
1. it is light convenient: the hoisting equipment has small scale, simple structure, convenient operation and convenient installation and use;
2. the construction process is stable: the lifting system is driven by a quick winch, the lifting process is stable and efficient, the longitudinal movement adjusting system is driven in a full hydraulic mode, and the walking process is stable and reliable; the bridge deck traveling system is provided with the left-hand thread device, so that overturning of the hoisting equipment in the forward moving process can be effectively prevented.
3. Can finish double-side hoisting: this lifting device can accomplish the hoist and mount of the two prefabricated arms of choosing of core longeron through rotating system, and telescopic boom can carry out length angle modulation, ensures to assemble the butt joint, possesses extremely strong adaptability.
4. The anchoring is convenient: when the prefabricated cantilever arm is hoisted, the hoisting equipment is anchored on the embedded temporary anchoring block by the anchoring rope to prevent the hoisting equipment from turning over, and the anchoring block is also used for temporary prestressed anchoring and tensioning, so that the anchoring block does not need to be additionally arranged.
5. Hoisting equipment turnover efficiency is high: the prefabricated cantilever arms on the two sides are hoisted and the temporary prestress tensioning is completed, at the moment, the joint concrete does not need to wait for the strength, the anchoring can be released, and the crane walks to the next segment to continue hoisting.
Description of the drawings:
the accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic front view of the hoisting apparatus of the present invention;
FIG. 2 is a schematic view of a single-side cantilever arm for hoisting the hoisting equipment of the invention;
FIG. 3 is a schematic view of the hoisting device of the present invention hoisting the opposite cantilever arm;
FIG. 4 is a schematic view of the walking of the hoisting device of the present invention;
FIG. 5 is a schematic diagram of the temporary prestress tensioning of the present invention;
FIG. 6 is a schematic view of the position of the embedded temporary anchor block according to the present invention;
FIG. 7 is a schematic view of the arrangement of the suspension points of the prefabricated cantilever according to the present invention;
FIG. 8 is a schematic view of a composite cross-section segmented beam system according to the present invention;
in the figure: 1-a core stringer; 2-after-loading a prefabricated cantilever arm; 3-a winch; 4-a turntable; 5-supporting the pedestal; 6-telescopic suspension arm; 7-hoisting the steel wire; 8, hoisting the cross beam; 9-longitudinal walking track; 10-temporary prestressing; 11-a pushing oil cylinder; 12-a slide; 13-a left-hand device; 14-anchoring means; 15-fixing the ear seat; 16-an anchor cable; 17-support the bracket; and 18-embedding the temporary anchoring blocks.
The specific implementation mode is as follows:
in order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
The embodiment adopts the hoisting equipment and the construction method shown in the attached drawings, and is different from the prior art in that: the single-side light hoisting equipment comprises a rotating system, a hoisting system, a bridge deck walking system and a supporting and anchoring system. The rotating system is fixed on the core longitudinal beam 1 through the supporting anchoring system, the hoisting system is fixed on the rotating system and hoists the prefabricated arm 2 through a sling, after the arms are hoisted on two sides, the hoisting equipment moves forwards through the bridge deck traveling system. Light-duty hoisting equipment simple structure, the anchor is convenient, and the arm hoist and mount are chosen in prefabrication that accessible rotating system accomplished both sides in proper order to improve hoisting equipment turnover efficiency, reduce construction period.
In the concrete implementation, the structural system based on the hoisting equipment and the construction method is a composite section beam system, and comprises a built core longitudinal beam 1 section, a prefabricated cantilever arm 2, a pre-embedded temporary anchoring block 18, a temporary prestress 10 and a support bracket 17.
The rotating system is characterized in that the rotating disc 4 is fixed on the supporting system and connected with the hoisting system.
The hoisting system comprises a telescopic boom 6 and a winch 3. The pulley block at the top end of the suspension arm supports a hoisting steel wire 7 to hoist heavy objects, and the lower end of the hoisting steel wire 7 is connected with a hoisting cross beam 8. The selection of the lifting points must ensure that the prefabricated cantilever arm does not rotate, tilt or overturn after being lifted, and preferably, 4 lifting points are arranged on the prefabricated cantilever arm; as shown in fig. 7, a pair of hanging points on the near bridge side is 1m away from the joint in the bridge direction, a pair of hanging points on the far bridge side is 4m away from the joint in the bridge direction, and each pair of hanging points is symmetrical about the center line of the rib plate and is 0.75m away from the center line.
During specific implementation, the prefabricated cantilever arm 2 is fixed by the winch steel wire lock catch, the cantilever arm is continuously lifted by the winch 3, and fine adjustment is carried out through the stretching of the suspension arm 6 or the change of the inclination angle after the cantilever arm reaches a specified height; after accurate butt joint, suspension is kept, and the temporary prestress 10 is tensioned between the prefabricated cantilever arm 2 and the embedded temporary anchoring block 18. As shown in fig. 5, the arrangement form of the temporary pre-stress 10 may be 1, 2 or more, and preferably, a double pre-stress form, i.e. a b scheme, may be adopted. The arrangement of the embedded anchor blocks 18 is as shown in fig. 6, wherein the two anchor blocks on the prefabricated cantilever arm 2 are symmetrical about the center line of the ribbed plate of the cantilever arm, the distance from the center line of the ribbed plate is 0.75m, and the distance from the joint in the bridge direction is 2.5 m; the two anchoring blocks on the core longitudinal beam are symmetrical about the center line of the cantilever rib plate, the distance from the center line of the rib plate is 0.75m, and the distance from the joint in the bridge direction is 2 m.
The bridge deck traveling system is characterized by comprising a sliding seat 12, two traveling rails 9 laid in the middle of a core longitudinal beam along the bridge direction, a longitudinal pushing oil cylinder 11 and a left-hand thread device 13.
The supporting and anchoring system comprises a supporting pedestal 5, an anchoring device 14, an anchoring cable 16 and a pre-buried temporary anchoring block 18. The support pedestal 5 is fixed on the fixing ear seat 15 of the core longitudinal beam 1 through an anchoring device 14, preferably, the anchoring device is a pin shaft system which is convenient to install and remove, the upper end of the anchoring device is connected with the support pedestal 5 through a pin shaft, and the lower end of the anchoring device is connected with the fixing ear seat of the core longitudinal beam 1 through a pin shaft.
In specific implementation, the two continuous longitudinal rails 10 are laid in the center of the core longitudinal beam in a full length mode and fixed on the embedded fixed lug seats 15 of the core longitudinal beam through the pin shaft mechanisms; the front end of a longitudinal pushing oil cylinder 12 is propped against a sliding seat 11, the rear end of the longitudinal pushing oil cylinder is fixed on a track 10, and the sliding seat 12 is pushed in the longitudinal direction to drive the hoisting equipment to move forwards integrally; the left-hand thread mechanisms 13 are arranged at 1/4 of the pedestal, the number of each side is 2, the two sides are arranged in the same way, the upper parts of the left-hand thread mechanisms are fixed on the supporting pedestal 5, the lower parts of the left-hand thread mechanisms are contacted with the lower sides of the upper flanges of the rails through rollers at the two sides, and when the hoisting equipment moves forwards, the hoisting equipment is prevented from overturning; when the hoisting equipment travels to a designated position, the hoisting equipment is anchored on the embedded temporary anchoring blocks 18 by the anchoring cables 16, the supporting pedestal 5 is anchored on the fixing lug seats 15 of the core longitudinal beam 1 by the anchoring devices, preferably, the anchoring devices are arranged at 1/2 of the pedestal, the number of each side is 1, and the two sides are arranged in the same way.
Specifically, the construction method suitable for synchronously hoisting the two sides of the composite section beam to prefabricate the cantilever arm comprises the following steps:
a, erecting and assembling the core longitudinal beam 1 of the main section by a bridge erecting machine, completing forward movement, and erecting cantilever lifting equipment on the core longitudinal beam 1. b, when the prefabricated cantilever arm 2 is hoisted, hoisting equipment is fixed on the core longitudinal beam 1 through a supporting anchoring system, and the suspension arm hoisting device is used for prefabricating the cantilever arm 2
The cantilever arm 2 is hoisted to one side of the composite section beam bridge, and the position of the cantilever arm is changed by the length change of the suspension arm or the rotation of the inclination angle
Adjusting to realize accurate positioning and installation; and keeping the suspension, and performing temporary prestress tensioning on the prefabricated cantilever arm 2 and the core longitudinal beam 1. c, completing the temporary prestress tensioning of the prefabricated cantilever arm 2 and the core longitudinal beam 1 on one side, removing the hoisting suspension, and dismantling the hoisting equipment and the core
Anchoring between temporary anchoring blocks 18 is pre-embedded on the core longitudinal beam 1; rotating the suspension arm and re-anchoring to perform opposite side prefabrication and cantilever arm 2
And (4) hoisting.
d, the prefabricated cantilever arms 2 on the two sides of the segment complete temporary prestress tensioning, the anchoring devices 14 and the anchoring cables 16 are released, and the bridge floor walks
A longitudinal pushing oil cylinder 11 of the system pushes a sliding seat 12 and a roller of a left-hand thread mechanism to contact with the upper flange of the track, so that the hoisting equipment is prevented from overturning when moving forwards, and the hoisting equipment is moved forwards; and moving to the next section cantilever hoisting position, and fixing the hoisting equipment to the core longitudinal beam 1 again through the anchoring device 14 and the anchoring cable 16 for next hoisting.
The foregoing is a more detailed description of the present invention in connection with specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific details set forth herein. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. The single-side light hoisting equipment is suitable for a rear cantilever arm of a composite-section beam bridge and comprises a rotating system, a hoisting system, a bridge deck walking system and a supporting and anchoring system; the method is characterized in that: the rotating system is fixed on the core longitudinal beam (1) through the supporting anchoring system, the hoisting system is fixed on the rotating system and hoists the prefabricated arm (2) through a sling, after the arms are hoisted on two sides and hoisted, the hoisting equipment moves forwards through the bridge floor traveling system.
2. The hoisting device according to claim 1, characterized in that the hoisting device is based on a structural system of composite section beam system, comprising built-up section core stringers (1), prefabricated cantilever arms (2), pre-embedded temporary anchor blocks (18), temporary prestressing (10), and supporting brackets (17).
3. Hoisting device according to claim 1, characterized in that in the rotating system, the turntable (4) is fixed to the support and anchoring system and connected to the hoisting system.
4. Hoisting device according to claim 1, wherein the hoisting system comprises a telescopic boom (6), a hoist (3), a hoisting beam (8); the hoisting device is characterized in that a pulley block at the top end of the suspension arm supports a hoisting steel wire to hoist heavy objects; the hoisting steel wire (7) is connected with a hoisting crossbeam (8) and is used for hanging, assembling and prefabricating the cantilever arm (2); the selection of the hoisting points must ensure the safety and stability of the hoisting process of the prefabricated cantilever arm (2), preferably, the prefabricated cantilever arm (2) is provided with 4 hoisting points for hoisting together, wherein the hoisting points can be arranged at the position of 1/4 cantilever arms along the bridge direction, and the hoisting points are symmetrically arranged along the bridge direction according to the gravity center position of the cantilever arms.
5. The hoisting device according to claim 1, wherein the traveling system comprises a sliding base (12), two traveling rails (9), a jacking cylinder (11) and a left-hand thread device (13); the rail is laid in the middle of the core longitudinal beam (1) along the bridge direction, a sliding seat (12) matched with the rail is arranged on the rail, the rear end of a longitudinal pushing oil cylinder (11) is hinged to the rail, the front end of the longitudinal pushing oil cylinder is propped against the sliding seat (12), the upper portion of a left-hand thread mechanism is installed on a supporting anchoring system through a pin shaft, and the lower portion of the left-hand thread mechanism is in contact with the outer side of a flange of the rail through a roller.
6. Hoisting device according to claim 1, wherein the supporting and anchoring system comprises a support pedestal (5), an anchoring device (14), an anchoring cable (16) and a pre-embedded temporary anchoring block (18); the supporting pedestal (5) is fixed on a fixing lug seat (15) of the core longitudinal beam (1) through an anchoring device (14), preferably, the anchoring device is a pin shaft system convenient to install and remove, the upper end of the anchoring device is connected with the supporting pedestal (5) through a pin shaft, and the lower end of the anchoring device is connected with the fixing lug seat (15) of the core longitudinal beam (1) through a pin shaft; during hoisting, the hoisting equipment is anchored to the embedded temporary anchoring block (18) through the anchoring rope (16), so that the hoisting equipment is prevented from turning over laterally.
7. Hoisting device according to claim 6, wherein the pre-embedded temporary anchor blocks (18) are used for anchoring the anchor cables (16) of the hoisting device on the one hand and simultaneously for anchoring and tensioning the temporary prestressing (10) on the other hand; the arrangement form of the temporary prestress (10) can be 1, 2 or more, and preferably, the arrangement form of 2 prestress can be adopted; preferably, 2 embedded temporary anchoring blocks (18) are respectively arranged on the core longitudinal beam (1) and the prefabricated cantilever arm (2), and the anchoring cable (16) can anchor the hoisting equipment to the two anchoring blocks on the core longitudinal beam (1).
8. The hoisting equipment as recited in claim 7, characterized in that the two embedded temporary anchoring blocks (18) on the prefabricated cantilever arm (2) are symmetrical along the bridge direction with respect to the centerline of the rib plate of the cantilever arm, the distance from the centerline is 1/4, the cantilever arm is long along the bridge direction, and the distance from the seam along the bridge direction is 1/3-1/2, and the transverse cantilever arm is wide; two anchoring blocks on the core longitudinal beam (1) are symmetrical along the bridge direction about the center line of the cantilever rib plate, the distance from the center line of the rib plate is 1/4, the cantilever is long along the bridge direction, and the transverse bridge direction is positioned above the web plate of the core longitudinal beam (1).
9. The construction method for hoisting the prefabricated cantilever arm for the composite-section segmental beam bridge suitable for the hoisting equipment as claimed in claim 1 comprises the following steps:
a, erecting and assembling a core longitudinal beam (1) of the main section by a bridge erecting machine, completing forward movement, and erecting cantilever lifting equipment on the core longitudinal beam (1);
b, when the prefabricated cantilever arm (2) is hoisted, hoisting equipment is fixed to the core longitudinal beam (1) through a supporting and anchoring system, the prefabricated cantilever arm (2) is hoisted to one side of the core longitudinal beam by the suspension arm hoisting device, and the position of the cantilever arm is adjusted through the length change or the rotation of an inclination angle of the suspension arm, so that accurate positioning and installation are realized; keeping suspension, and performing temporary prestress tensioning on the prefabricated cantilever arm (2) and the core longitudinal beam (1);
c, completing the temporary prestress tensioning of the prefabricated cantilever arm (2) on one side and the core longitudinal beam (1), and dismantling an anchor cable (16) between hoisting equipment and a pre-embedded temporary anchor block (18) on the core longitudinal beam (1); the rotating system rotates the suspension arm to the opposite side and anchors the suspension arm again, and hoisting of the prefabricated cantilever arm (2) on the opposite side is carried out;
d, the prefabricated cantilever arms (2) on the two sides of the segment complete temporary prestress tensioning, the anchoring device (14) and the anchoring cable (16) are released without waiting for the joint concrete to reach the strength, a longitudinal pushing oil cylinder (11) of a bridge floor traveling system pushes a sliding seat (12), and the hoisting equipment moves forwards; and moving to the next section cantilever arm hoisting position, and fixing the hoisting equipment to the core longitudinal beam (1) again through the anchoring device (14) and the anchoring cable (16) for next hoisting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553242.3A CN113135508A (en) | 2021-05-20 | 2021-05-20 | Single-side light hoisting equipment suitable for rear cantilever arm of composite-section beam bridge and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110553242.3A CN113135508A (en) | 2021-05-20 | 2021-05-20 | Single-side light hoisting equipment suitable for rear cantilever arm of composite-section beam bridge and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113135508A true CN113135508A (en) | 2021-07-20 |
Family
ID=76817679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110553242.3A Pending CN113135508A (en) | 2021-05-20 | 2021-05-20 | Single-side light hoisting equipment suitable for rear cantilever arm of composite-section beam bridge and construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113135508A (en) |
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2021
- 2021-05-20 CN CN202110553242.3A patent/CN113135508A/en active Pending
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