CN116446297A - Prefabricated small box girder through-center type hoisting construction method - Google Patents
Prefabricated small box girder through-center type hoisting construction method Download PDFInfo
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- CN116446297A CN116446297A CN202310536773.0A CN202310536773A CN116446297A CN 116446297 A CN116446297 A CN 116446297A CN 202310536773 A CN202310536773 A CN 202310536773A CN 116446297 A CN116446297 A CN 116446297A
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- box girder
- small box
- top plate
- lifting
- fixed seat
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Abstract
The invention discloses a prefabricated small box girder through hoisting construction method, which comprises the following steps: 1. a pair of through holes for installing a lifting appliance are reserved at two ends of a top plate of the prefabricated small box girder respectively; 2. the lifting appliance comprises a fixed seat positioned on the top plate of the small box girder, a base plate positioned below the top plate, a lifting rod, a nut, a stress pin and a hanging strip, wherein the lifting rod of the lifting appliance penetrates through the fixed seat, the through hole and the base plate, the upper end and the lower end of the lifting rod are screwed by the nut to fix the fixed seat on the top plate of the small box girder, the lower end of the hanging strip is connected with the fixed seat through the stress pin, and the upper end of the hanging strip is connected with lifting equipment; 3. lifting equipment is used to lift the roof of the trabecula to the desired height. According to the invention, the through hole is formed in the top plate of the prefabricated small box girder, and the hanger rod passes through the hole to be hoisted during hoisting, so that the extrusion and friction of the steel wire rope to the side surface of the box girder in the traditional method are avoided, the risks of box girder damage and steel wire rope maintenance and replacement are reduced, auxiliary equipment and human resources required during hoisting are saved, and the construction cost and potential safety hazard are reduced.
Description
Technical Field
The invention belongs to a box girder hoisting construction method, and particularly relates to a prefabricated small box girder through-the-center hoisting construction method.
Background
The prefabricated small box girder is a common bridge structural form, has larger section torsional strength and bending strength, is low in price and high in construction speed, and is widely applied at home and abroad. The construction of the prefabricated small box girder mainly comprises the working procedures of prefabrication, hoisting, erection and the like. The hoisting is one of the key procedures, and the quality and safety of the prefabricated small box girder are directly affected.
The traditional hoisting method of the prefabricated small box girder mainly comprises two methods: a hoisting method for the bottom of a steel wire rope is that a hole is formed in a prefabricated pedestal, the steel wire rope passes through the hole and is fixed at the bottom of a box girder, and then the box girder is lifted to a required height by using hoisting equipment and is moved to an erection position; the other is a pre-buried lifting hook lifting method, namely, a steel strand or carbon structural steel is arranged on a steel skeleton of a prefabricated small box girder to serve as a lifting hook, and then the box girder is lifted to a required height by using lifting equipment and moved to an erection position.
Both of these methods have some drawbacks and disadvantages. The hoisting method of the steel wire rope bottom is required to open holes on the prefabricated pedestal, so that the construction difficulty and cost are increased, and the pedestal is easy to damage and unstable; meanwhile, the steel wire rope can generate extrusion and friction force on the side surface of the box girder in the hoisting process, so that the damage and deformation of the box girder are easy to cause; in addition, the wire ropes also require periodic replacement and maintenance, increasing material consumption and management costs. According to the steel reinforcement framework hoisting method, lifting lugs or lifting rings are required to be arranged on the steel reinforcement framework, so that the difficulty and the cost of processing the steel reinforcement are increased, and the construction cost is increased due to the arrangement of the lifting lugs or the lifting rings; meanwhile, the steel bar framework is also subjected to bending and torsion forces in the hoisting process, so that the steel bars are easy to break or loosen; in addition, the steel reinforcement framework also needs to be checked and repaired regularly, so that construction risks and potential safety hazards are increased. Therefore, a method for hoisting the prefabricated small box girder, which can overcome the defects and shortcomings, is urgently needed at present.
Disclosure of Invention
The invention aims to provide a prefabricated small box girder through-type hoisting construction method capable of improving construction quality and safety and reducing construction cost.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the invention provides a prefabricated small box girder through-type hoisting construction method, which comprises the following steps:
step 1, reserving a pair of through holes for installing a lifting appliance at two ends of a top plate of a prefabricated small box girder respectively;
step 2, the lifting appliance comprises a fixed seat positioned on the top plate of the small box girder, a base plate positioned below the top plate, a suspender, a nut, a stress pin and a hanging strip;
a suspender of the sling passes through the fixed seat, the through hole and the base plate, the upper end and the lower end of the suspender are screwed by nuts to fix the fixed seat on a top plate of the small box girder, and the lower end of the suspender is connected with the fixed seat through a stress pin; the upper end of the sling is connected with hoisting equipment;
and 3, lifting the small box girder top plate to a required height by using lifting equipment.
In the step 1, the through holes at the two ends of the top plate of the prefabricated small box girder are positioned at a distance of 1.2m from the girder end, and the distance between each pair of through holes is 60cm; the forming mode of the through hole is as follows: in the manufacturing process of the top plate of the prefabricated small box girder, a PVC pipe is pre-buried at a designated position and reinforced and fixed by a reinforcing steel bar;
in the step 2, the suspender is a special lifting appliance penetrating rod, the material is 30CrMnSiA, and the specification model is T58X500.
Advantageous effects
According to the method, through arranging the through hole on the top plate of the prefabricated small box girder, the hanger rod passes through the hole to be hoisted during hoisting, so that the extrusion and friction of the steel wire rope to the side surface of the box girder in the traditional method are avoided, and the risks of damage to the box girder and maintenance and replacement of the steel wire rope are reduced. Meanwhile, auxiliary equipment and human resources required during hoisting are saved, and construction cost and potential safety hazards are reduced. The method has the advantages of simple operation, high efficiency, good quality, environmental protection, low carbon and the like.
The technical scheme of the invention is further described below with reference to the accompanying drawings.
Drawings
Fig. 1 is a front view of the use state of the present invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a schematic view of the construction of the spreader of fig. 1.
Fig. 4 is a schematic view of the construction of the spreader of fig. 2.
Detailed Description
Referring to fig. 1-4, the construction method for the through hoisting of the prefabricated small box girder provided by the invention comprises the following specific steps:
1. referring to fig. 1 and 2, a pair of circular through holes 102 with the diameter of 75mm for installing a lifting appliance are reserved at the positions 1.2m away from the beam ends at the two ends of a top plate 101 of a prefabricated small box beam 1, and the distance between each pair of through holes 101 is 60cm; the through hole 102 is the only connecting part of the small hoisting box girder 1, and the dimensional accuracy and the surface quality of the small hoisting box girder should be ensured so as to adapt to the installation and the disassembly of the lifting appliance 2; the through-hole 102 is formed by: in the manufacturing process of the top plate 101 of the prefabricated small box girder 1, a PVC pipe is pre-buried at a designated position and reinforced and fixed by a reinforcing steel bar;
2. the lifting appliance 2 comprises a fixed seat 203 positioned on the top plate 101 of the small box girder 1, a base plate 205 positioned below the top plate 101, a suspender 204, a nut 206, a stress pin 202 and a hanging strip 201;
a suspender 204 of the sling 2 passes through a fixed seat 203, a through hole 102 and a base plate 205, the fixed seat 203 is fixed on the top plate 101 of the small box girder 1 by tightening nuts 206 at the upper end and the lower end of the suspender 204, and the lower end of the suspender 201 is connected with the fixed seat 203 through a stress pin 202; the suspender 204 is a special sling through rod, is made of 30CrMnSiA, has the specification model of T58X500, has enough bearing capacity and bending resistance to bear the dead weight of a small box girder top plate and the dynamic load in the lifting process, and can be flexibly matched with lifting equipment; the upper end of the sling 201 is connected with lifting equipment; the suspension rod 204 is provided with a nut 206 and a gasket 205, which can be used for adjusting tension and preventing slippage;
3. the lifting device is used for slowly lifting the top plate 101 of the small box girder 1 to the required height, the lifting device in the prefabricated place is a 95T gantry crane, the lifting device in the bridge girder erection area is a 160T bridge girder erection machine, the large lifting capacity and the large operation range are provided, the requirement of the prefabricated small box girder top plate lifting construction method can be met, and the erection position and the moving speed of the small box girder can be accurately controlled.
In the small box girder hoisting process, the following safety measures and the key points of quality control need to be paid attention to: (1) Before hoisting, checking the integrity and bearing capacity of a hanger such as a suspender, hoisting equipment and a steel wire rope, and the strength and the integrity of a small box girder top plate, and preventing accidents such as fracture and falling off in the hoisting process; (2) In the hoisting process, the horizontal posture of the small box girder top plate is kept, so that adverse effects such as tilting and torsion are avoided, and meanwhile, the hoisting speed and the acceleration and deceleration are controlled, so that adverse effects such as impact and shaking are avoided; (3) In the hoisting process, the safety distance between the small box girder and the prefabricated pedestal and the bridge girder area is kept, accidents such as collision, scraping and the like are avoided, meanwhile, the deformation and crack conditions of the small box girder top plate are observed, and abnormal conditions are found and treated in time; (4) In the hoisting process, special personnel conduct and supervise to ensure the standardization and safety of hoisting operation, and meanwhile, the special personnel are responsible for on-site traffic and safety management to prevent other personnel or vehicles from entering a hoisting area to cause interference or danger; (5) After the roof of the small box girder is erected in place, the roof of the small box girder should be positioned and fixed in time to prevent the roof of the small box girder from moving or collapsing due to external forces such as wind power, earthquake and the like. Meanwhile, the device should be checked and accepted, and the size, shape, position, connection and the like of the device are confirmed to meet the design requirements and specification requirements.
Compared with a hoisting method for the bottom of the steel wire rope, the method does not need to adopt a lower pad wedge block for opening holes of the prefabricated pedestal and embedding steel plates at the bottom of the beam, the method for filling sand into the holes of the prefabricated pedestal by the traditional method is omitted, the overall stability of the prefabricated pedestal is ensured, the service life is prolonged, and meanwhile, the integrity of the bottom die of the small box beam is ensured.
Claims (3)
1. A prefabricated small box girder through-core type hoisting construction method is characterized by comprising the following steps:
step 1, reserving a pair of through holes for installing a lifting appliance at two ends of a top plate of a prefabricated small box girder respectively;
step 2, the lifting appliance comprises a fixed seat positioned on the top plate of the small box girder, a base plate positioned below the top plate, a lifting rod, a nut, a stress pin and a hanging strip, wherein the lifting rod of the lifting appliance penetrates through the fixed seat, the through hole and the base plate, the upper end and the lower end of the lifting rod are screwed by the nut to fix the fixed seat on the top plate of the small box girder, the lower end of the hanging strip is connected with the fixed seat through the stress pin, and the upper end of the hanging strip is connected with lifting equipment;
and 3, lifting the small box girder top plate to a required height by using lifting equipment.
2. The method for constructing the prefabricated small box girder by through-center type hoisting according to claim 1, wherein in the step 1, the through-center holes at the two ends of the top plate of the prefabricated small box girder are located at a distance of 1.2m from the girder end, and each pair of through-center holes are 60cm apart, and the through-center holes are formed in the following manner: in the manufacturing process of the top plate of the prefabricated small box girder, PVC pipes are pre-buried at designated positions and are reinforced and fixed by reinforcing steel bars.
3. The construction method for the through-center hoisting of the prefabricated small box girder according to claim 1, wherein in the step 2, the suspender is a special hoisting tool through-center rod, the material is 30CrMnSiA, and the specification model is T58X500.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310536773.0A CN116446297A (en) | 2023-05-12 | 2023-05-12 | Prefabricated small box girder through-center type hoisting construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310536773.0A CN116446297A (en) | 2023-05-12 | 2023-05-12 | Prefabricated small box girder through-center type hoisting construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116446297A true CN116446297A (en) | 2023-07-18 |
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ID=87125707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310536773.0A Pending CN116446297A (en) | 2023-05-12 | 2023-05-12 | Prefabricated small box girder through-center type hoisting construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116446297A (en) |
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2023
- 2023-05-12 CN CN202310536773.0A patent/CN116446297A/en active Pending
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