CN111101435A - Steering gear between prefabricated concrete beams by broken line pre-tensioning method and construction method - Google Patents
Steering gear between prefabricated concrete beams by broken line pre-tensioning method and construction method Download PDFInfo
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- CN111101435A CN111101435A CN202010022583.3A CN202010022583A CN111101435A CN 111101435 A CN111101435 A CN 111101435A CN 202010022583 A CN202010022583 A CN 202010022583A CN 111101435 A CN111101435 A CN 111101435A
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- steering column
- jack
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention discloses a prefabricated concrete beam-to-beam steering gear adopting a fold line pretensioning method and a construction method, wherein a chassis of the beam-to-beam steering gear comprises a concrete base and a limiting cylinder arranged on the concrete base; the lifting assembly comprises a steering column, a stiffening support plate and a jack, wherein the inner side edge of the stiffening support plate is fixed to the outer peripheral wall of the steering column, the jack is arranged between the concrete base and the stiffening support plate, the lower part of the steering column is sleeved in the limiting cylinder, and the height adjustment of the steering column is realized through the jack; the guide assembly comprises a roller, a pin shaft and a nut, and the roller is arranged on the steering column at equal intervals through the pin shaft and the nut. The steering column is lifted to be in place through the jack, the steering of the broken line prestressed tendon is realized, the force is discharged through the jack, the tension release of the broken line prestressed tendon is realized, the steering gear between the beams is light in structure, the construction method is simple, the effect is obvious, the adjustability is realized, and the safety of prefabrication construction is improved; on the other hand, the anti-corrosion coating has strong durability, long service life and can be repeatedly used.
Description
Technical Field
The invention relates to a bridge construction technology, in particular to a steering gear between prefabricated concrete beams by a broken line pretensioning method and a construction method.
Background
The broken line pretensioning method is an advanced middle and small span prestressed concrete bridge prefabricating method in China, and can meet the requirements of prefabrication, assembly and rapidness of bridge design and construction at the present stage of China. When single span prefabrication is carried out, the broken line prestressed tendons realize high-position bending at the tensioning end through the bogie, and realize low-position bending in the beam body through the bending device. In order to further improve the efficiency of the production beam, a long-line prefabrication method is mostly adopted, and a plurality of broken beams with two spans and more than two spans are simultaneously tensioned and prefabricated. Thus, a steering gear is required to be arranged between the span and the beam of the span to realize the bending of the prestressed tendons. In addition, as the span of the precast beam is increased, the prestressed tendons required to be bent are correspondingly increased, the steering gear between beams needs to bear larger reaction force of the prestressed tendons, and the broken line prestressed tendons are more difficult to relieve. On one hand, the existing steering gear between beams needs to be very large, has poor economy and does not have an adjusting function in order to meet the structural stress requirement; on the other hand, the broken line prestressed tendons are difficult to relieve, and the stress of the steering gear between the beams is excessively concentrated when the broken line prestressed tendons are serious, so that local damage is caused, and the production continuity is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a steering gear between precast concrete beams by a broken line pretensioning method and a construction method, which can overcome the defects of the existing steering gear between precast concrete beams by a large-span broken line pretensioning method and improve the economy and safety of a prestressed concrete beam in the long line prefabrication process.
The purpose of the invention is realized by adopting the following technical scheme:
the steering gear between the beams of the prefabricated concrete beam adopting the broken line pretensioning method comprises an underframe, a lifting assembly and a guide assembly, wherein the guide assembly is arranged on the lifting assembly, the lifting assembly is arranged on the underframe in a height-adjustable manner, and the underframe comprises a concrete base and a limiting cylinder arranged on the concrete base; the lifting assembly comprises a steering column, stiffening support plates and jacks, the inner side edges of the stiffening support plates are fixed to the outer peripheral wall of the lower portion of the steering column, the jacks are arranged between the concrete base and the stiffening support plates, the lower portion of the steering column is sleeved in the limiting barrel, and the height of the steering column is adjusted through the jacks; the guide assembly comprises a roller, a pin shaft and a nut, and the roller is arranged on the steering column at equal intervals through the pin shaft and the nut.
Preferably, a horizontal support ring is welded at the bottom of the stiffening support plates and used for supporting the top of the jack.
Preferably, the periphery equipartition of a spacing section of thick bamboo sets up a plurality of equal high bracing pieces, and is a plurality of the top of bracing piece sets up a horizontal annular backing plate, the bottom setting of bracing piece is in on the concrete foundation, the bottom setting of jack is in on the backing plate.
Preferably, the concrete base is of a plain concrete structure, a seat hole is formed in the concrete base, and the limiting cylinder is embedded into the seat hole.
Preferably, the support rod is made of high-strength I-steel, and a support bottom plate is arranged at the bottom of the support rod.
Preferably, the limiting cylinder is an upper-end opening steel member welded by high-strength steel plates.
Preferably, the steering column is a closed steel member formed by welding high-strength steel plates, a plurality of through holes for installing a guide assembly are horizontally formed in the steering column, and two rollers of the guide assembly are arranged in the steering column.
Preferably, a U-shaped groove is formed in the wheel surface of the roller and is used for a broken line prestressed tendon to pass through; the pin shaft is made of a high-strength bolt, and the nut is a high-strength nut matched with the pin shaft.
Preferably, a plurality of the jacks are 50T small jacks.
Preferably, the left and right limiting amplitude of the steering column on the limiting cylinder is 2 mm.
The application also provides a construction method for carrying out the broken line prestressed tendons by adopting the steering gear between the beams, which comprises the following steps:
assembling the steering gear between the beams, firstly, when the long-line precast pedestal is manufactured, pouring a concrete base between two spans of precast beams and reserving a seat hole for installing a limiting cylinder on the concrete base; secondly, inserting a limiting cylinder into a seat hole of the concrete base, installing a support rod and a base plate, arranging a stiffening support plate and a horizontal support ring on the steering column, installing a plurality of guide assemblies consisting of rollers, pin shafts and nuts in a through hole on the steering column, and inserting the lower part of the steering column into the limiting cylinder; finally, a jack is arranged between the support rod and the stiffening support plate to complete the assembly of the steering gear between the beams;
firstly, applying acting force through a jack before tensioning the broken line prestressed tendons to jack the steering column to a designed height; secondly, sequentially arranging the broken line prestressed tendons on the U-shaped grooves of the rollers;
pouring high-strength main beam concrete, tensioning the broken-line prestressed tendons to a target strength through jacks on a tensioning pedestal, and pouring the high-strength main beam concrete;
and (3) releasing the steering gear between the beams, and after the strength of the main beam concrete meets the requirement, unloading the force applied by a jack on the steering gear between the beams in a grading manner to enable the steering column to descend slowly, so that the steering gear between the beams is released, and meanwhile, the purpose of releasing the tension of the broken line prestressed tendons is achieved.
Compared with the prior art, the invention has the beneficial effects that: according to the construction method, the steering column or the bogie is jacked to be in place through the jack, the steering of the broken line prestressed tendons is realized, the force is relieved through the jack, the tension of the broken line prestressed tendons is realized, the construction method is simple and easy to operate, on one hand, the steering device between the beams is light in structure, easy to operate, remarkable in effect and adjustable, and the safety of long-line prefabrication is improved; on the other hand, the anti-corrosion coating has strong durability, long service life and can be repeatedly used.
Drawings
FIG. 1 is a schematic front view of a prefabricated concrete inter-beam steering device using a broken line pretensioning method;
FIG. 2 is a schematic side view of a prefabricated concrete beam-to-beam steering gear using a broken line pretensioning method;
fig. 3 is an enlarged view of the guide assembly.
In the figure: 1. a steering column; 2. a roller; 3. a pin shaft; 4. a nut; 5. a limiting cylinder; 6. a stiffening support plate; 7. a jack; 8. a base plate; 9. a support bar; 10. a concrete base; 11. a horizontal support ring.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1 to 3, the prefabricated concrete beam-to-beam steering device adopting the broken line pretensioning method comprises an underframe, a lifting assembly and a guide assembly, wherein the guide assembly is arranged on the lifting assembly, and the lifting assembly is arranged on the underframe in a height-adjustable manner. The mounting, tensioning and releasing of the broken line prestressed tendons are realized through the steering gear between the beams.
Chassis
The underframe comprises a concrete base 10 and a limiting cylinder 5 arranged on the concrete base 10. The periphery equipartition at spacing section of thick bamboo 5 sets up a plurality of equal high bracing pieces 9, sets up a horizontal annular backing plate 8 at the top of a plurality of bracing pieces 9, and the bottom of bracing piece 9 sets up on concrete foundation 10, and the bottom of jack 7 sets up on backing plate 8.
Wherein, concrete foundation 10 is plain concrete structure to offer the seat hole on concrete foundation 10, spacing section of thick bamboo 5 inlays and establishes into in the seat hole.
The support rod 9 is made of high-strength I-steel, and a support bottom plate is arranged at the bottom of the support rod 9.
The limiting cylinder 5 is an upper end opening steel member welded by high-strength steel plates.
Lifting assembly
Lifting unit includes steering column 1, the backup pad of putting more energy into 6 and jack 7, and a plurality of inboard edges of the backup pad of putting more energy into 6 are fixed to the periphery wall of the 1 lower part of steering column on, and a plurality of jacks 7 set up between concrete foundation 10 and the backup pad of putting more energy into 6, and the lower part of steering column 1 is cup jointed in spacing section of thick bamboo 5 to realize the altitude mixture control of steering column 1 through jack 7. The limiting amplitude of the steering column 1 on the left and right of the limiting cylinder 5 is 2 mm.
A horizontal support ring 11 is welded at the bottom of the stiffening support plates 6 and used for supporting the top of the jack 7. The jack 7 is preferably a 50T mini jack.
Guide assembly
Including gyro wheel 2, round pin axle 3 and nut 4, gyro wheel 2 is through the equidistant setting on steering column 1 of round pin axle 3 and nut 4.
Wherein, a U-shaped groove is arranged on the wheel surface of the roller 2 for the broken line prestressed tendon to pass through; the pin shaft 3 adopts a high-strength bolt, and the nut 4 is a high-strength nut matched with the pin shaft 3.
The construction principle is that the method for releasing the tension of the broken line prestressed tendon by adopting the steering gear between the beams comprises the following steps:
assembling the steering gear between the beams, firstly, when the long-line precast pedestal is manufactured, pouring a concrete base 10 between two spans of precast beams and reserving a seat hole for installing a limiting cylinder 5 on the concrete base 10; secondly, inserting a limiting cylinder 5 into a seat hole of a concrete base 10, installing a support rod 9 and a base plate 8, arranging a stiffening support plate 6 and a horizontal support ring 11 on the steering column 1, installing a plurality of guide assemblies consisting of rollers 2, pin shafts 3 and nuts 4 in a through hole on the steering column 1, and inserting the lower part of the steering column 1 into the limiting cylinder 5; finally, a jack 7 is arranged between the support rod 9 and the stiffening support plate 6, and the assembly of the steering gear between the beams is completed;
firstly, applying an acting force through a jack 7 before tensioning the broken line prestressed tendons to jack the steering column 1 to a designed height; secondly, the broken line prestressed tendons are sequentially arranged on the U-shaped grooves of the rollers 2;
pouring high-strength main beam concrete, tensioning the broken line prestressed tendons to a target strength through a jack 7 on the tensioning pedestal, and pouring the high-strength main beam concrete;
and (3) releasing the steering gear between the beams, and after the strength of the main beam concrete meets the requirement, gradually releasing the force applied by a jack on the steering gear between the beams to slowly descend the steering column 1, so that the release of the steering gear between the beams is realized, and the purpose of releasing the tension of the broken line prestressed tendons is achieved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A steering gear between broken line pretension method precast concrete roof beam, the steering gear between roof beam includes chassis, lifting unit and direction subassembly, the direction subassembly sets up on the lifting unit, lifting unit height-adjustable's setting is on the chassis, its characterized in that: the underframe comprises a concrete base (10) and a limiting cylinder (5) arranged on the concrete base (10); the lifting assembly comprises a steering column (1), stiffening support plates (6) and jacks (7), the inner side edges of the stiffening support plates (6) are fixed to the outer peripheral wall of the lower portion of the steering column (1), the jacks (7) are arranged between the concrete base (10) and the stiffening support plates (6), the lower portion of the steering column (1) is sleeved in the limiting barrel (5), and the height of the steering column (1) is adjusted through the jacks (7); the guide assembly comprises a roller (2), a pin shaft (3) and a nut (4), wherein the roller (2) is arranged on the steering column (1) at equal intervals through the pin shaft (3) and the nut (4).
2. The inter-beam redirector of claim 1, wherein: and a horizontal support ring (11) is welded at the bottom of the stiffening support plates (6) and is used for supporting the top of the jack (7).
3. The inter-beam redirector as defined in claim 1 or 2, wherein: the periphery equipartition of a spacing section of thick bamboo (5) sets up a plurality of equal high bracing pieces (9), and is a plurality of the top of bracing piece (9) sets up a horizontal annular backing plate (8), the bottom of bracing piece (9) sets up on concrete foundation (10), the bottom of jack (7) sets up on backing plate (8).
4. The inter-beam redirector of claim 3, wherein: the concrete base (10) is of a plain concrete structure, a seat hole is formed in the concrete base (10), and the limiting cylinder (5) is embedded into the seat hole.
5. The inter-beam redirector of claim 3, wherein: the support rod (9) is made of high-strength I-shaped steel, and a support bottom plate is arranged at the bottom of the support rod (9).
6. The inter-beam redirector of claim 3, wherein: the limiting cylinder (5) is an upper end opening steel member welded by high-strength steel plates.
7. The inter-beam redirector of claim 3, wherein: the steering column (1) is a closed steel member formed by welding high-strength steel plates, a plurality of through holes for installing guide assemblies are horizontally formed in the steering column (1), and two rollers (2) of the guide assemblies are arranged in the steering column (1); the left and right limiting amplitude of the steering column (1) in the limiting cylinder (5) is 2mm, acting force is applied and removed through the jack (7), the steering column (1) moves up and down in the limiting cylinder (5), and steering and releasing of the broken line prestressed tendons are completed.
8. The inter-beam redirector of claim 3, wherein: a U-shaped groove is formed in the wheel surface of the roller (2) and is used for a broken line prestressed tendon to pass through; the pin shaft (3) adopts a high-strength bolt, and the nut (4) is a high-strength nut matched with the pin shaft (3).
9. The inter-beam redirector of claim 3, wherein: the jacks (7) are 50T small jacks.
10. A method of constructing a polyline tendon using an inter-beam diverter as claimed in any one of claims 1 to 9, the method comprising:
assembling the steering gear between the beams, firstly, when a long-line prefabricated pedestal is manufactured, pouring a concrete base (10) between two spans of prefabricated beams and reserving a seat hole for installing a limiting cylinder (5) on the concrete base (10); secondly, inserting a limiting cylinder (5) into a seat hole of a concrete base (10), installing a support rod (9) and a base plate (8), arranging a stiffening support plate (6) and a horizontal support ring (11) on the steering column (1), installing a plurality of guide assemblies consisting of rollers (2), pin shafts (3) and nuts (4) in through holes on the steering column (1), and inserting the lower part of the steering column (1) into the limiting cylinder (5); finally, a jack (7) is arranged between the support rod (9) and the stiffening support plate (6) to complete the assembly of the steering gear between the beams;
firstly, applying acting force through a jack (7) before tensioning the broken line prestressed tendons to jack the steering column (1) to a designed height; secondly, sequentially arranging the broken line prestressed tendons on the U-shaped grooves of the rollers (2);
pouring high-strength main beam concrete, tensioning the broken-line prestressed tendons to a target strength through jacks on a tensioning pedestal, and pouring the high-strength main beam concrete;
and (3) releasing the steering gear between the beams, and after the strength of the main beam concrete meets the requirement, unloading the force applied by a jack on the steering gear between the beams in a grading manner to slowly descend the steering column (1), thereby realizing the release of the steering gear between the beams and simultaneously achieving the purpose of releasing the tension of the broken line prestressed tendons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022583.3A CN111101435A (en) | 2020-01-09 | 2020-01-09 | Steering gear between prefabricated concrete beams by broken line pre-tensioning method and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010022583.3A CN111101435A (en) | 2020-01-09 | 2020-01-09 | Steering gear between prefabricated concrete beams by broken line pre-tensioning method and construction method |
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| CN111101435A true CN111101435A (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010022583.3A Pending CN111101435A (en) | 2020-01-09 | 2020-01-09 | Steering gear between prefabricated concrete beams by broken line pre-tensioning method and construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112518983A (en) * | 2020-12-11 | 2021-03-19 | 保利长大工程有限公司 | Pre-tensioning method precast beam slab tensioning pedestal structure |
| CN112627041A (en) * | 2020-12-24 | 2021-04-09 | 保利长大工程有限公司 | Steering device for prestress steel beam multi-beam connection |
| CN116201035A (en) * | 2023-02-28 | 2023-06-02 | 山东四方路桥集团股份有限公司 | Prestress steel strand steering gear |
-
2020
- 2020-01-09 CN CN202010022583.3A patent/CN111101435A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112518983A (en) * | 2020-12-11 | 2021-03-19 | 保利长大工程有限公司 | Pre-tensioning method precast beam slab tensioning pedestal structure |
| CN112627041A (en) * | 2020-12-24 | 2021-04-09 | 保利长大工程有限公司 | Steering device for prestress steel beam multi-beam connection |
| CN112627041B (en) * | 2020-12-24 | 2021-12-17 | 保利长大工程有限公司 | Steering device for prestress steel beam multi-beam connection |
| CN116201035A (en) * | 2023-02-28 | 2023-06-02 | 山东四方路桥集团股份有限公司 | Prestress steel strand steering gear |
| CN116201035B (en) * | 2023-02-28 | 2024-01-16 | 山东四方路桥集团股份有限公司 | Prestress steel strand steering gear |
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