CN111270612B - Auxiliary front-end hole passing method for large-span T-shaped beam bridge erecting machine over-span automobile crane - Google Patents
Auxiliary front-end hole passing method for large-span T-shaped beam bridge erecting machine over-span automobile crane Download PDFInfo
- Publication number
- CN111270612B CN111270612B CN202010091819.9A CN202010091819A CN111270612B CN 111270612 B CN111270612 B CN 111270612B CN 202010091819 A CN202010091819 A CN 202010091819A CN 111270612 B CN111270612 B CN 111270612B
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- bridge
- girder erection
- erection machine
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- bridge girder
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses an auxiliary via-passing method for the front end of a long-span T-beam bridge crane across-span truck crane, which comprises the following steps: s1: moving the bridge girder erection machine to a fulcrum; s2: the bridge girder erection machine is in a balanced state; s3: arranging a crane on the axle of the tail end bridge of the main girder of the main bridge; s4: starting a lifting rope of the automobile crane until the lifting force reaches the lifting force required by a main truss of the bridge girder erection machine; s5: checking the elevation change condition of the lifting end of the bridge girder erection machine and the self condition of the automobile crane; s6: after the bridge girder erection machine moves forwards to the designed position, the front support rod and the track beam are placed on the main girder of the main bridge and are reliably fixed. The invention has the beneficial effects that the auxiliary hole passing method which is simple and easy to operate is provided, the safety degree of construction is improved, the construction period is shortened, and higher economic benefit is achieved.
Description
Technical Field
The invention relates to the field of bridging, in particular to a front-end auxiliary hole passing method of a large-span T-beam bridge girder erection machine cross-span automobile crane.
Background
The span of the large-span T beam is large, the weight of the single-piece beam is heavy, the length of a cantilever extending out of the wing plate is large, the load of the conventional construction method is large and far exceeds the bearing capacity of the wing plate, so that a bridge girder erection machine needs to be used for passing holes during construction, but the conventional hole passing method still causes the problems.
Disclosure of Invention
In view of the above, in order to overcome the above problems, the invention provides an auxiliary via-passing method for the front end of a cross-span automobile crane of a long-span T bridge girder erection machine.
The purpose of the invention is realized by the following technical scheme:
the auxiliary via-passing method for the front end of the cross-span automobile crane of the large-span T-beam bridge erecting machine comprises the following steps:
s1: adjusting the position of a fulcrum on the beam body with the last span completed, and moving the bridge girder erection machine to the fulcrum;
s2: arranging two overhead cranes and a beam transporting vehicle on the bridge girder erection machine to specified positions, lifting a beam by using the overhead cranes, and moving the bridge girder erection machine to a direction close to a standard span until the bridge girder erection machine stops at a position which is 47.0m away from the standard span of 50.0m, so that the bridge girder erection machine is in a balanced state;
s3: arranging an automobile crane on the axle of the tail end bridge of the main beam of the main bridge, determining the position of the automobile crane and the angle of a suspension arm according to the strength of the hoisting load, so that the automobile crane can meet the requirement of the hoisting load, and selecting the diameter of a hoisting rope and the factor of safety factor according to the use angle of the hoisting rope;
s4: connecting and tightening a lifting rope of the automobile crane and a lifting rope with one end of the bridge girder erection machine close to the standard span, and then starting the automobile crane to lift the lifting rope until the lifting force reaches the lifting force required by a main separation girder of the bridge girder erection machine;
s5: checking the elevation change condition of the lifting end of the bridge girder erection machine and the self condition of the automobile crane, and continuously moving the bridge girder erection machine to the design position in the direction of the standard span under the assistance of the automobile crane after no problem exists;
s6: after the bridge girder erection machine moves forwards to the designed position, the front support rod and the track beam are placed on the main beam of the main bridge and are reliably fixed, and the lifting rope of the automobile crane is detached and the automobile crane exits after no problem exists.
Further, before the bridge girder erection machine is subjected to hole passing construction, a load test needs to be carried out on the bridge girder erection machine so as to ensure the safety of the operation of hanging beams of the bridge girder erection machine.
Further, the movement process of the bridge erecting machine in the step S5 should be performed slowly, and care should be taken to control the mutual matching of the bridge erecting machine and the car crane.
The invention has the beneficial effects that:
the method has the advantages that the auxiliary hole passing method which is simple and easy to operate is provided, the safety degree of construction is improved, the construction period is shortened, and higher economic benefits are achieved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or embodiments described below.
Detailed Description
The following is a detailed description of preferred embodiments of the invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
The embodiment provides an auxiliary via hole method for the front end of a cross-span automobile crane of a large-span T-beam bridge erecting machine, which is used for solving the practical problem of engineering and has the following general engineering outline: the approach bridge is a 9-span simply-supported prefabricated T-shaped beam, the span of 1 st span to 7 th span is 50.0m, the width of a single beam is 1.8 m, the height of the single beam is 2.7 m, and the maximum beam weight of the single beam is 174.4 tons; the 8 th span is 47.5m, the width of the single beam is 1.8 m, the height of the single beam is 2.7 m, and the maximum beam weight of the single beam is 167.4 tons; the span of the 9 th span is 52.5m, the width of the single beam is 1.8 m, the height of the single beam is 2.9 m, and the maximum beam of the single beam weighs 188.8 tons.
The plane arrangement of each simply supported T beam of the approach bridge is as follows: the 1 st span to the 3 rd span and the 7 th span to the 9 th span adopt a sector arrangement mode so as to adapt to the connection requirements of the upper ramp and the lower ramp. The spans 4-6 are all arranged in parallel.
The number of the arranged pieces of each simply supported T beam of the approach bridge is as follows: the 1 st span to the 2 nd span is 11 pieces, the 3 rd span is 12 pieces, the 4 th span to the 6 th span is 9 pieces, the 7 th span is 13 pieces, the 8 th span to the 9 th span is 12 pieces, and the bridge approach 9 spans 98 pieces in total for simply supporting the prefabricated installation T beam.
The difficulty of the project is that: the 9 th span of the approach bridge is the last T-shaped beam bridge section of the tail end of the approach bridge, the design span is 52.5m, and 12T beams are erected and installed. The maximum span of the bridge approach T-beam installation is 188.8 tons at the maximum. The front end of the cross T-beam is connected with a pier No. P8 of the main bridge and placed on the capping beam, the highest height of a pier No. P8 is about 60 meters, and the rear end of the cross T-beam is connected with a pier No. P7 of the approach bridge and placed on the capping beam.
When the cross T-shaped beam is erected, the front fulcrum of the bridge girder erection machine is placed on the main beam of the main bridge, the middle fulcrum of the rear end is placed at the front end of the finished T-shaped beam in the P7 number domain, and the distance from the front fulcrum of the bridge girder erection machine to the center of the middle fulcrum is 55.4 meters.
The height of the tail beam section of the main bridge is 4.5 meters, the width of the bridge deck is 25 meters, the width of the beam bottom is 16 meters, and the thickness of the wing plate cantilever at two sides is 4.5 meters respectively although the thickness of the thickened section of the wing plate reaches 1 meter. However, the length of the cantilever extending out of the wing plate is too large to reach 4.5 meters, and when the load erected by the beam body acts on the wing plate, the bearing capacity of the beam body needs to be considered.
The pier capping beam of the approach bridge P7 is a middle pivot point when a beam body is erected, and the load of the pier capping beam is large, so the bearing capacity of the pier capping beam needs to be considered.
The ANSYS software is used for carrying out stress analysis and calculation (calculation result is omitted) on the tail beam wing section, the track beam, the tail beam section wing plate, the cover beam and the beam body of the main bridge under each working condition of the approach bridge, and then the following scheme is provided for the 9 th span through hole:
in this embodiment, "front" is the direction toward the hole, and "rear" is the direction away from the hole.
The auxiliary via-passing method for the front end of the cross-span automobile crane of the large-span T-beam bridge erecting machine comprises the following steps:
s1: adjusting the position of a fulcrum on the 8 th span finished beam body, and moving the bridge girder erection machine to the fulcrum, wherein the implementation mode in the embodiment is to move the bridge girder erection machine forward by about 27 meters and stop the bridge girder erection machine;
s2: arranging two overhead cranes and a beam transporting vehicle on the bridge girder erection machine to specified positions, lifting a beam by using the overhead cranes, and moving the bridge girder erection machine to a direction close to a standard span until the bridge girder erection machine stops at a position which is 47.0m away from the standard span of 50.0m, so that the bridge girder erection machine is in a balanced state;
through calculation and analysis, the front ends of the left main analysis beam and the right main analysis beam of the bridge crane respectively need 25 tons of lifting force in a proper state, and the internal force of the main analysis beam of the bridge crane meets the requirement. The lifting force required by the front end of the whole bridge crane is 50 tons (vertical force).
S3: according to the calculation and analysis result (namely the stress analysis of ANSYS), an automobile crane with the rated hoisting capacity of 200 tons is arranged on the axle line of the tail end bridge of the main girder of the main bridge, the position of the automobile crane and the angle of the suspension arm are determined according to the hoisting load force, so that the automobile crane can meet the requirement of hoisting load, and the diameter of the lifting rope and the factor of safety are selected according to the use angle of the lifting rope:
s4: connecting and tightening a lifting rope and a lifting rope of the automobile crane with the front end of the bridge girder erection machine, and then starting the lifting rope of the automobile crane until the lifting force reaches the lifting force (50 tons) required by a main bridge girder of the bridge girder erection machine;
s5: checking the elevation change condition of the lifting end of the bridge girder erection machine and the self condition of the automobile crane, after no problem exists, under the assistance of the automobile crane, continuously moving the bridge girder erection machine to the design position in the direction of the standard span, wherein the process of moving the bridge girder erection machine is carried out slowly, and the mutual matching of the bridge girder erection machine and the automobile crane is controlled properly;
s6: after the bridge girder erection machine moves forwards to the designed position, the front support rod and the track beam are placed on the main beam of the main bridge and are reliably fixed, and the lifting rope of the automobile crane is detached and the automobile crane exits after no problem exists.
Before the hole is drilled, related preparation works such as technical safety traffic, personnel arrangement, material equipment, automobile cranes, sling rope clamps and the like are selected. After the via hole is finished, a careful and complete check is made, and particularly whether the stability of each supporting point and structure meets the requirements or not.
Before the bridge girder erection machine is subjected to hole passing construction, a load test needs to be carried out on the bridge girder erection machine so as to ensure the safety of the operation of the hanging beam of the bridge girder erection machine.
The load test specifically comprises the following steps:
1. after the 8 th span beam body is installed and the transverse connection is completed, the bridge girder erection machine can be transversely moved to the middle of the bridge floor and then is fixed in place.
2. The middle pivot point is moved to a designated position at the rear end, the distance between the front pivot point and the middle pivot point is the same as the installation span of the 9 th span, and the installation span of the 9 th span is 55.40 meters.
3. The stable condition of each pivot is checked, and one-step operation can be carried out after the observation points (the cross-center and front pivots) are set to meet the requirements.
4. And (4) placing the two-day vehicle at a proper beam hanging position, placing the rear supporting point in place and supporting the rear supporting point on the bridge floor, and placing the beam carrying vehicle in place.
5. And (3) taking the 9 th span beam body as a carrier, placing the second-day vehicle lifting beam between two main separation devices of the bridge girder erection machine, stopping the vehicle lifting beam when the front overhead vehicle reaches the span of the bridge girder erection machine, checking the two main separation devices of the bridge girder erection machine and the front fulcrum, and observing the deformation condition. After no problem, one-step operation can be carried out.
And 6, stopping the two-day vehicle when the two-day vehicle continues to move forwards to the installation position, lowering the beam body about 15 cm away from the bridge floor, and preparing the auxiliary support super pier in place for later use. Then, the two main analytical inclined rods (hanging points) and the front pivot of the bridge crane are checked, and the deformation condition is observed. And after no problem exists, the next operation can be carried out.
7, stopping when the belt beam of the two-day vehicle transversely displaces to the maximum point, and observing the deformation condition by observing the unbalance loading phenomenon of two main separation of the bridge crane and the inspection of the inclined rod (the hanging point) and the front pivot. And after no problem exists, the next operation can be carried out.
8. And returning the experimental hanging beam according to a reverse method, placing the experimental hanging beam on a beam transporting vehicle for fixing, and finishing the experiment.
9. After the test is finished, the test is carefully and comprehensively checked again, and the test condition and related data are filed and recorded.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (3)
1. The method for assisting the via-hole at the front end of the cross-span automobile crane of the large-span T-beam bridge girder erection machine is characterized by comprising the following steps of: the via hole method specifically comprises the following steps:
s1: adjusting the position of a fulcrum on the beam body with the last span completed, and moving the bridge girder erection machine to the fulcrum;
s2: arranging two overhead cranes and a beam transporting vehicle on the bridge girder erection machine to specified positions, lifting a beam by using the overhead cranes, and moving the bridge girder erection machine to a direction close to a standard span until the bridge girder erection machine stops at a position which is 47.0m away from the standard span of 50.0m, so that the bridge girder erection machine is in a balanced state;
s3: arranging an automobile crane on the axle of the tail end bridge of the main beam of the main bridge, determining the position of the automobile crane and the angle of a suspension arm according to the strength of the hoisting load, so that the automobile crane can meet the requirement of the hoisting load, and selecting the diameter of a hoisting rope and the factor of safety factor according to the use angle of the hoisting rope;
s4: connecting and tightening a lifting rope of the automobile crane and a lifting rope with one end of the bridge girder erection machine close to the standard span, and then starting the lifting rope of the automobile crane until the lifting force reaches the lifting force required by a main truss girder of the bridge girder erection machine;
s5: checking the elevation change condition of the lifting end of the bridge girder erection machine and the self condition of the automobile crane, and continuously moving the bridge girder erection machine to the designed position in the hole direction with the assistance of the automobile crane after no problem exists;
s6: after the bridge girder erection machine moves forwards to the designed position, the front support rod and the track beam are placed on the main beam of the main bridge and are reliably fixed, and the lifting rope of the automobile crane is detached and the automobile crane exits after no problem exists.
2. The via method of claim 1, wherein: before the construction of the via holes of the bridge girder erection machine, the bridge girder erection machine needs to be subjected to a load test so as to ensure the safety of the operation of the hanging beam of the bridge girder erection machine.
3. The via method of claim 1, wherein: the movement process of the bridge erecting machine in the step S5 is carried out slowly, and the mutual matching of the bridge erecting machine and the automobile crane is controlled properly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010091819.9A CN111270612B (en) | 2020-02-14 | 2020-02-14 | Auxiliary front-end hole passing method for large-span T-shaped beam bridge erecting machine over-span automobile crane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010091819.9A CN111270612B (en) | 2020-02-14 | 2020-02-14 | Auxiliary front-end hole passing method for large-span T-shaped beam bridge erecting machine over-span automobile crane |
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| Publication Number | Publication Date |
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| CN111270612A CN111270612A (en) | 2020-06-12 |
| CN111270612B true CN111270612B (en) | 2021-08-17 |
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| CN202010091819.9A Expired - Fee Related CN111270612B (en) | 2020-02-14 | 2020-02-14 | Auxiliary front-end hole passing method for large-span T-shaped beam bridge erecting machine over-span automobile crane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114575263B (en) * | 2022-04-01 | 2024-03-15 | 永富建工集团有限公司 | Bridge machine via hole method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3542050A1 (en) * | 1985-11-28 | 1987-06-04 | Horst Surbeck | Scaffolding for manufacturing superstructures |
| DE10137797A1 (en) * | 2001-08-06 | 2003-02-27 | Heinz Von Doellen | Lining device used in concreting a longitudinal profile having a uniform or periodically changing cross-section on an existing longitudinal construction is suspended on a vertical holding element on the existing longitudinal construction |
| CN102704407A (en) * | 2012-07-03 | 2012-10-03 | 中铁一局集团有限公司 | Construction method of lower guide beam type bridge-erecting crane passing through tunnel |
| CN102797226A (en) * | 2012-07-26 | 2012-11-28 | 中铁六局集团有限公司 | Integral erection construction method of 60m steel box girder |
| CN105155428A (en) * | 2015-10-26 | 2015-12-16 | 杭州江润科技有限公司 | Operating-railway-crossing construction method for large assembly-type prestress concrete continuous T beam |
| CN105648916A (en) * | 2016-01-04 | 2016-06-08 | 秦皇岛天业通联重工科技有限公司 | Bridge girder erection machine and erection method of bridge girder erection machine |
| CN106968160A (en) * | 2017-04-12 | 2017-07-21 | 中交第二公路勘察设计研究院有限公司 | The short side that a kind of steel truss girder is mixed with beams of concrete is across Cable-Stayed Bridge Structure |
-
2020
- 2020-02-14 CN CN202010091819.9A patent/CN111270612B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3542050A1 (en) * | 1985-11-28 | 1987-06-04 | Horst Surbeck | Scaffolding for manufacturing superstructures |
| DE10137797A1 (en) * | 2001-08-06 | 2003-02-27 | Heinz Von Doellen | Lining device used in concreting a longitudinal profile having a uniform or periodically changing cross-section on an existing longitudinal construction is suspended on a vertical holding element on the existing longitudinal construction |
| CN102704407A (en) * | 2012-07-03 | 2012-10-03 | 中铁一局集团有限公司 | Construction method of lower guide beam type bridge-erecting crane passing through tunnel |
| CN102797226A (en) * | 2012-07-26 | 2012-11-28 | 中铁六局集团有限公司 | Integral erection construction method of 60m steel box girder |
| CN105155428A (en) * | 2015-10-26 | 2015-12-16 | 杭州江润科技有限公司 | Operating-railway-crossing construction method for large assembly-type prestress concrete continuous T beam |
| CN105648916A (en) * | 2016-01-04 | 2016-06-08 | 秦皇岛天业通联重工科技有限公司 | Bridge girder erection machine and erection method of bridge girder erection machine |
| CN106968160A (en) * | 2017-04-12 | 2017-07-21 | 中交第二公路勘察设计研究院有限公司 | The short side that a kind of steel truss girder is mixed with beams of concrete is across Cable-Stayed Bridge Structure |
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