CN115284415A - Box girder prefabricated template for preventing core mould from floating upwards and pouring method - Google Patents
Box girder prefabricated template for preventing core mould from floating upwards and pouring method Download PDFInfo
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- CN115284415A CN115284415A CN202210917963.2A CN202210917963A CN115284415A CN 115284415 A CN115284415 A CN 115284415A CN 202210917963 A CN202210917963 A CN 202210917963A CN 115284415 A CN115284415 A CN 115284415A
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- China
- Prior art keywords
- box girder
- bottom plate
- core
- sides
- pedestal
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
- B28B7/0008—Venting channels, e.g. to avoid vacuum during demoulding or allowing air to escape during feeding, pressing or moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
- B28B7/0035—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding
- B28B7/0038—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding the sidewalls of mould and moulded article moving only past each other, e.g. box-shaped moulds which are lifted off from the moulding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
- B28B7/0035—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding
- B28B7/0044—Moulds characterised by the way in which the sidewalls of the mould and the moulded article move with respect to each other during demoulding the sidewalls of the mould being only tilted away from the sidewalls of the moulded article, e.g. moulds with hingedly mounted sidewalls
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/26—Assemblies of separate moulds, i.e. of moulds or moulding space units, each forming a complete mould or moulding space unit independently from each other
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/28—Cores; Mandrels
- B28B7/285—Core puller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a box girder prefabricated template for preventing a core mould from floating upwards and a pouring method, wherein the box girder prefabricated template comprises a pedestal, outer moulds arranged on two sides of the pedestal and the core mould arranged above the pedestal and arranged between the outer moulds on the two sides of the pedestal, and a bottom plate of the core mould is provided with an opening along the length direction; the device also comprises a pressure plate assembly, wherein the pressure plate assembly comprises a longitudinal beam, a pressure plate and a hydraulic cylinder; the longitudinal beam is supported right above the opening through a supporting piece, the pressing plate is suspended below the longitudinal beam through a tension spring, the plurality of hydraulic cylinders are embedded into the pedestal right below the opening at intervals, the upper ends of the output shafts of the hydraulic cylinders penetrate through the pressing plate and are locked on the upper side of the pressing plate through the locking piece, and sleeves extending from the top surface of the pedestal to the opening on the core mold bottom plate are sleeved outside the output shafts of the hydraulic cylinders. The invention combines the structures for preventing the core mould from floating upwards and preventing the bottom plate from concreting and exhausting, has simpler structure and simultaneously improves the concreting continuity of the bottom plate and the web plate of the box girder.
Description
Technical Field
The invention relates to the technical field of box girder prefabrication, in particular to a box girder prefabrication template capable of preventing a core mould from floating upwards and a pouring method.
Background
The precast prestressed box girder has the advantages of good integral rigidity, strong transverse stability and reasonable technical economy and is widely applied to highway bridges. The concrete before initial setting after stirring is a mixed material between liquid and solid, and when the concrete is static, the interaction between various mixed materials is very small, but in the construction process of the box girder, the impact force generated by pouring the concrete and the vibration force generated by vibrating the concrete for discharging air bubbles can make the concrete flow downwards under the action of force to form fluid. Thereby generating a counter force against the object that restricts its flow. Lateral pressure is generated on the outer die and the core die in the transverse direction, buoyancy is generated on the core die in the longitudinal direction, and when the core die floats upwards during pouring of the box girder concrete, the thickness of the bottom plate and the thickness of the top plate of the box girder are reduced, so that the quality of the box girder is influenced.
At present, the common measures for controlling the core mould to float upwards in the market are as follows: (1) A beam is arranged above the core mold, the beam is connected with the outer mold vertical belt, and the beam is used as an adjustable screw for supporting to tightly push a top plate of the core mold downwards; and (2) tensioning the bottom plate of the core mould on the pedestal through a pull rod.
In the process of pouring box girder bottom plate concrete, the problem of mandrel floating is not considered, but the air is discharged when the concrete is poured, so that the air is discharged when the concrete is poured conveniently, the air outlet is formed in the bottom plate of the box girder inner mold in the prior art, after the bottom plate is poured, the air outlet is manually closed, and then the pouring of box girder web plates and top plate concrete is carried out.
Therefore, in the prior art, a structure for preventing the core mold from floating upwards and an exhaust structure for pouring the bottom plate concrete need to be separately arranged, the structure is complex, and after the bottom plate is poured, the exhaust port needs to be manually plugged, so that the concrete pouring continuity of the bottom plate and the web plate of the box girder is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a box girder prefabricated template for preventing a core mould from floating upwards and a pouring method, so that the structures for preventing the core mould from floating upwards and the concrete pouring and exhausting of a bottom plate are combined, the structure is simpler, and the concrete pouring continuity of the bottom plate and a web plate of the box girder is improved.
On one hand, the invention provides a box girder prefabricated template for preventing a core mould from floating upwards, which comprises a pedestal, outer moulds arranged on two sides of the pedestal and the core mould arranged above the pedestal and arranged between the outer moulds on two sides of the pedestal;
the bottom plate of the core mold is provided with an opening along the length direction;
the device also comprises a pressure plate assembly, wherein the pressure plate assembly comprises a longitudinal beam, a pressure plate and a hydraulic cylinder;
the longeron pass through support piece support in directly over the open-ended, the clamp plate suspend in midair in through the extension spring in the below of longeron, it is a plurality of pneumatic cylinder interval embedding install in on the pedestal under the opening, the upper end of the output shaft of pneumatic cylinder passes the clamp plate and through the locking of retaining member locking in the upside of this clamp plate, the clamp plate can push down on the bottom plate of mandrel and carry out the shutoff to the opening on the bottom plate of mandrel under the drive of pneumatic cylinder, the output shaft overcoat of pneumatic cylinder be equipped with by the top surface of pedestal extends to the sleeve pipe of the opening part on the mandrel bottom plate.
Furthermore, the supporting pieces comprise a plurality of supporting rods symmetrically distributed on two sides of the longitudinal beam, the supporting rods extend obliquely downwards from the longitudinal beam, and two ends of each supporting rod are hinged to the inner wall of the core mold and the side part of the longitudinal beam respectively;
and two sides of the top plate of the core mold are respectively hinged with the side plates on each side.
Furthermore, a plurality of limiting parts used for abutting against the pressing plate are arranged on the lower side of the longitudinal beam at intervals.
Furthermore, the locking piece is a locking nut which is sleeved at the upper end of the output shaft of the hydraulic cylinder in a threaded manner.
Furthermore, the pedestal is provided with mounting holes corresponding to the hydraulic cylinders, the upper ends of the mounting holes are provided with annular steps, a plurality of embedded nuts are embedded in the annular steps at intervals along the circumferential direction, the hydraulic cylinders are arranged in the mounting holes, the upper ends of the hydraulic cylinders are provided with flange plates, the flanges are provided with connecting holes corresponding to the embedded nuts, the flange plates are adapted to the annular steps, and the connecting holes and the embedded nuts are aligned one by one and screwed with bolts.
Furthermore, a countersunk hole is formed in the upper side of the connecting hole, the end of the bolt sinks into the countersunk hole, and a sealing plug is arranged at the upper end of the countersunk hole.
Furthermore, the upper end of the hydraulic cylinder is provided with an annular bulge surrounding the output shaft of the hydraulic cylinder, the lower side of the pressure plate is provided with an annular groove surrounding the output shaft of the hydraulic cylinder, the lower end of the sleeve is sleeved outside the annular bulge, and the upper end of the sleeve is inserted into the annular groove.
On the other hand, the invention provides a box girder casting method for preventing a core mould from floating, which adopts the box girder prefabricated template for preventing the core mould from floating to cast the box girder, and specifically comprises the following steps:
step S1, installing an outer die, a core die and a steel bar;
s2, locking the upper end of an output shaft of the hydraulic cylinder with a pressing plate, and tightly pulling the pressing plate downwards through the output shaft of the hydraulic cylinder to enable two sides of the longitudinal beam to outwards push against side plates on two sides of the longitudinal beam through supporting rods;
s3, respectively pouring concrete between the outer mold and the core mold on two sides to finish the pouring of the box girder bottom plate;
s4, after the bottom plate of the box girder is poured, controlling each hydraulic cylinder to pull the movable platen downwards until the movable platen is pressed and covers the opening of the bottom plate of the core mold;
s5, continuously completing concrete pouring of the web plate and the top plate of the box girder;
and S6, after the concrete reaches the designed strength, removing the outer mold and the core mold, when removing the core mold, firstly controlling the output shafts of the hydraulic cylinders to move upwards, controlling the pressing plates to move upwards under the action of the tension springs and abut against the limiting parts on the lower sides of the longitudinal beams, then removing the locking parts at the upper ends of the output shafts of the hydraulic cylinders, then controlling the output shafts of the hydraulic cylinders to jack upwards, enabling the longitudinal beams to pull the side plates on the two sides of the core mold to rotate inwards through the supporting rods on the two sides of the longitudinal beams, further enabling the side plates on the two sides of the core mold to be loosened with the surfaces of the box girders, then controlling the output shafts of the hydraulic cylinders to retract, and finally pulling out the whole core mold in the box girders.
The invention has the beneficial effects that:
when the concrete of the box girder bottom plate is poured, the pressing plate is suspended below the longitudinal beam through the tension spring, the opening in the core mold bottom plate is opened at the moment, air can be exhausted through the opening when the bottom plate concrete is poured, the pressing plate can be rapidly pulled downwards through the hydraulic cylinder after the bottom plate is poured, so that the pressing plate is pressed on the bottom plate of the core mold, the opening in the core mold bottom plate is sealed, then the pouring of the box girder web concrete can be continuously carried out, in the process of pouring the box girder web concrete, the core mold can be tensioned on the pedestal 100 through the hydraulic cylinder, and the effect of preventing the core mold from floating upwards is achieved. Consequently, this application will prevent carminative structure combination of mandrel come-up and bottom plate concrete placement, not only can satisfy carminative requirement at case roof beam bottom plate concrete placement in-process, can play the effect that prevents the mandrel come-up in addition at case web concrete placement in-process, its structure is simpler, and after the bottom plate pouring is accomplished, can block the opening on the mandrel bottom plate rapidly, thereby accomplish the seamless connection that box beam bottom plate and web pour, improved the continuity of box beam bottom plate and web concrete placement.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a schematic view of an embodiment of the present invention during casting of a floor slab;
FIG. 4 is a schematic view of an embodiment of the present invention during casting of a web and a top deck;
FIG. 5 is a schematic view showing the case beam and side plates on both sides of the core mold loosened according to the embodiment of the present invention;
fig. 6 is a schematic view showing the case beam in which the core mold is integrally pulled out according to the embodiment of the present invention.
In the drawing, 100-stage; 110-mounting holes; 120-an annular step; 130-embedded nuts; 200-external mold; 300-core mold; 310-an opening; 400-a platen assembly; 410-longitudinal beams; 411-a limiter; 420-a platen; 421-an annular groove; 430-hydraulic cylinder; 431-flange plate; 432-connecting hole; 433-bolt; 434-countersinks; 435-sealing plug; 436-annular projection; 440-a tension spring; 450-a locking member; 460-a cannula; 470-support bar.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
As shown in fig. 1 to 6, an embodiment of the present invention provides a box girder prefabricated formwork for preventing a core mold from floating up, which includes a pedestal 100, an outer mold 200 provided at both sides of the pedestal 100, a core mold 300 provided above the pedestal 100 and interposed between the outer molds 200 at both sides of the pedestal 100, and a platen assembly 400.
The bottom plate of the core mold 300 is provided with an opening 310 in the longitudinal direction. The pressing plate assembly 400 includes a longitudinal beam 410, a pressing plate 420, and a hydraulic cylinder 430, the longitudinal beam 410 is supported directly above the opening 310 by a support, the pressing plate 420 is suspended below the longitudinal beam 410 by a tension spring 440, a plurality of hydraulic cylinders 430 are embedded into the base 100 installed directly below the opening 310 at intervals, the upper ends of the output shafts of the hydraulic cylinders 430 penetrate through the pressing plate 420 and are locked on the upper side of the pressing plate 420 by a locking member 450, the locking member 450 may be a locking nut threadedly engaged with the upper end of the output shaft of the hydraulic cylinder 430, the pressing plate 420 can be pressed down on the bottom plate of the core mold 300 and block the opening 310 on the bottom plate of the core mold 300 under the driving of the hydraulic cylinder 430, and a sleeve 460 extending from the top surface of the base 100 to the opening 310 on the bottom plate of the core mold 300 is sleeved on the output shaft of the hydraulic cylinder 430.
Referring to fig. 3, when concrete of a bottom plate of a box girder is poured, a pressing plate 420 is suspended below a longitudinal beam 410 by a tension spring 440, an opening 310 in the bottom plate of a core mold 300 is opened, air is discharged through the opening 310 when concrete of the bottom plate is poured, referring to fig. 4, after the pouring of the bottom plate is completed, the pressing plate 420 is rapidly pulled down by a hydraulic cylinder 430, so that the pressing plate 420 is pressed against the bottom plate of the core mold 300 and the opening 310 in the bottom plate of the core mold 300 is closed, and then the pouring of concrete of the box girder web can be continued, and the core mold 300 can be tightened on a pedestal 100 by the hydraulic cylinder 430 during the pouring of concrete of the box girder web, thereby playing a role of preventing the core mold 300 from floating up. Consequently, this application will prevent that mandrel 300 from floating and the carminative structure of bottom plate concrete placement from combining, not only can satisfy carminative requirement at box girder bottom plate concrete placement in-process, and can play the effect that prevents mandrel 300 come-up at box girder web concrete placement in-process, its structure is simpler, and after the bottom plate pouring is accomplished, opening 310 on the shutoff mandrel 300 bottom plate rapidly, thereby accomplish box girder bottom plate and web casting's seamless connection, the continuity of box girder bottom plate and web concrete placement has been improved.
In a preferred embodiment, the support member includes a plurality of support bars 470 symmetrically disposed at both sides of the longitudinal beam 410, the support bars 470 extend obliquely downward from the longitudinal beam 410, and both ends of the support bars 470 are hinged to the inner wall of the core mold 300 and the side portions of the longitudinal beam 410, respectively. Both sides of the top plate of the core mold 300 are hinged to the side plates of each side, respectively.
The core mold 300 of the embodiment adopts a structure that the side plates at both sides are hinged with the top plate respectively, when the box girder bottom plate concrete is poured, the side plates at both sides of the core mold 300 are not subjected to side pressure, so the pressing plate 420 can be pulled downwards by the hydraulic cylinders 430, the pressing plate 420 applies a downward pulling force to the longitudinal beam 410 by the tension springs 440, the longitudinal beam 410 outwards supports the side plates at both sides of the core mold 300 by the support rods 470 at both sides, when the box girder web is poured, the pressure ratio of the extrusion to the middle of the side plates at both sides of the core mold 300 is larger, at this time, the pressing plate 420 is clamped in the opening 310 of the bottom plate of the core mold 300, thus the side plates at both sides of the core mold 300 can be effectively prevented from being extruded and rotating to the middle, when the core mold 300 is removed, referring to fig. 5, the locking member 450 at the upper end of the output shaft of the hydraulic cylinders 430 is firstly removed, and then the output shaft of the hydraulic cylinders 430 is pushed upwards against the longitudinal beam 410, so that the longitudinal beam 410 pulls the side plates at both sides of the core mold 300 to rotate inwards by the support rods 470 at both sides, thereby loosening the side plates at both sides of the core mold 300 and the surface of the box girder 300, and then the core mold 300 can be easily pulled out of the box girder, and the core mold 300 can be easily pulled out of the box girder (referring to be pulled out (referring to the box girder.
Preferably, a plurality of limiting parts 411 for abutting against the pressing plate 420 are arranged at intervals on the lower side of the longitudinal beam 410, when the hydraulic cylinder 430 does not apply a downward traction force to the pressing plate 420, the pressing plate 420 abuts against the lower side of the limiting parts 411 under the action of the tension spring 440, and the tension spring 440 can maintain a large elastic force in an initial state, so that when the pressing plate 420 is pulled down by an output shaft of the hydraulic cylinder 430, the pressing plate 420 can provide a large tension force for the longitudinal beam 410 through the tension spring 440, thereby ensuring that the supporting rods 470 on both sides of the longitudinal beam 410 can support the side plates on both sides of the longitudinal beam 410 tightly.
In a preferred embodiment, the pedestal 100 is provided with mounting holes 110 corresponding to the hydraulic cylinders 430, the upper ends of the mounting holes 110 are provided with annular steps 120, the annular steps 120 are pre-embedded with a plurality of pre-embedded nuts 130 at intervals along the circumferential direction, the hydraulic cylinders 430 are arranged in the mounting holes 110, the upper ends of the hydraulic cylinders 430 are provided with flanges 431, the flanges are provided with connecting holes 432 corresponding to the pre-embedded nuts 130, the flanges 431 are adapted to the annular steps 120, and the connecting holes 432 are aligned with the pre-embedded nuts 130 one by one and are screwed with bolts 433. With the above-described structure, it is not only convenient to install the hydraulic cylinder 430 on the pedestal 100 in an embedded manner, but also to facilitate the removal, maintenance, or replacement of the hydraulic cylinder 430.
Preferably, a countersunk hole 434 is formed at an upper side of the connection hole 432, a tip of the bolt 433 is sunk into the countersunk hole 434, and a sealing plug 435 is formed at an upper end of the countersunk hole 434 to ensure that an upper surface of the pedestal 100 is flat and prevent cement mortar from being infiltrated.
In a preferred embodiment, the upper end of the hydraulic cylinder 430 is provided with an annular protrusion 436 surrounding the output shaft thereof, the lower side of the pressure plate 420 is provided with an annular groove 421 surrounding the output shaft of the hydraulic cylinder 430, the lower end of the sleeve 460 is fitted over the annular protrusion 436, and the upper end of the sleeve 460 is inserted into the annular groove 421. The sleeve 460 mainly plays a role of isolating and protecting an output shaft of the hydraulic cylinder 430, when the box girder bottom plate is poured, the lower end of the sleeve 460 is sleeved on the annular protrusion 436 for fixation, the upper end of the sleeve 460 exceeds the height of the top surface of the box girder bottom plate, so that cement can be prevented from entering the sleeve 460, when the pressing plate 420 is buckled into the opening 310 on the bottom plate of the core mold 300, the upper end of the sleeve 460 is inserted into the annular groove 421 on the lower side of the pressing plate 420, and therefore the lower surface of the pressing plate 420 and the top surface of the box girder bottom plate can be ensured to be at the same height.
The embodiment of the invention provides a box girder pouring method for preventing a core mould from floating, which adopts the box girder prefabricated template for preventing the core mould from floating to pour the box girder, and specifically comprises the following steps:
step S1, installing an outer die 200, a core die 300 and reinforcing steel bars;
step S2, locking the upper end of the output shaft of the hydraulic cylinder 430 with the pressing plate 420, and tightly pulling the pressing plate 420 downwards through the output shaft of the hydraulic cylinder 430, so that the two sides of the longitudinal beam 410 are tightly propped against the side plates (shown in FIG. 1) at the two sides of the longitudinal beam 410 outwards through the support rods 470;
step S3, respectively pouring concrete between the outer die 200 and the core die 300 on the two sides to finish pouring of the box girder bottom plate (as shown in FIG. 3);
step S4, after the bottom plate of the box girder is poured, controlling each hydraulic cylinder 430 to pull the movable platen 420 downwards until the movable platen 420 is pressed and covers the opening 310 of the bottom plate of the core mold 300;
step S5, continuously completing concrete pouring of the web plate and the top plate of the box girder (as shown in FIG. 4);
step S6, after the concrete reaches the designed strength, the outer mold 200 and the core mold 300 are removed, when the core mold 300 is removed, the output shafts of the hydraulic cylinders 430 are controlled to move upward, the pressing plates 420 move upward under the action of the tension springs 440 and abut against the limiting members 411 on the lower sides of the longitudinal beams 410, the locking members 450 on the upper ends of the output shafts of the hydraulic cylinders 430 are removed, then the output shafts of the hydraulic cylinders 430 are controlled to push up, so that the longitudinal beams 410 pull the side plates on the two sides of the core mold 300 to rotate inward through the support rods 470 on the two sides of the longitudinal beams, further the side plates on the two sides of the core mold 300 are loosened from the surface of the box girder (as shown in fig. 5), then the output shafts of the hydraulic cylinders 430 are controlled to retract (as shown in fig. 6), and finally the core mold 300 in the box girder is pulled out integrally.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being covered by the appended claims and their equivalents.
Claims (8)
1. The utility model provides a prevent box girder prefabricated formwork of mandrel come-up, includes the pedestal, locates the external mold of pedestal both sides and locating the top of pedestal is placed in the mandrel between the external mold of this pedestal both sides, its characterized in that:
the bottom plate of the core mold is provided with an opening along the length direction;
the device also comprises a pressure plate assembly, wherein the pressure plate assembly comprises a longitudinal beam, a pressure plate and a hydraulic cylinder;
the longeron pass through support piece support in directly over the open-ended, the clamp plate suspend in midair in through the extension spring in the below of longeron, it is a plurality of pneumatic cylinder interval embedding install in on the pedestal under the opening, the upper end of the output shaft of pneumatic cylinder is passed the clamp plate is locked in the upside of this clamp plate through the retaining member, and the clamp plate can push down on the bottom plate of mandrel and carry out the shutoff to the opening on the bottom plate of mandrel under the drive of pneumatic cylinder, the output shaft overcoat of pneumatic cylinder be equipped with by the top surface of pedestal extends to the sleeve pipe of opening part on the mandrel bottom plate.
2. The prefabricated box girder formwork for preventing the core formwork from floating upwards as claimed in claim 1, wherein:
the supporting pieces comprise a plurality of supporting rods which are symmetrically distributed on two sides of the longitudinal beam, the supporting rods extend obliquely from the longitudinal beam to the lower side, and two ends of each supporting rod are respectively hinged to the inner wall of the core mold and the side part of the longitudinal beam;
and two sides of the top plate of the core mold are respectively hinged with the side plates on each side.
3. The precast box girder formwork for preventing the core formwork from floating up as claimed in claim 2, wherein:
and a plurality of limiting parts which are used for abutting against the pressing plate are arranged at the lower side of the longitudinal beam at intervals.
4. The precast box girder formwork for preventing the core formwork from floating up as claimed in claim 1, wherein:
the locking piece is a locking nut which is sleeved at the upper end of the output shaft of the hydraulic cylinder in a threaded manner.
5. The precast box girder formwork for preventing the core formwork from floating up as claimed in claim 1, wherein:
the hydraulic cylinder is characterized in that the pedestal is provided with mounting holes corresponding to the hydraulic cylinders, annular steps are arranged at the upper ends of the mounting holes, a plurality of embedded nuts are embedded in the annular steps at intervals along the circumferential direction, the hydraulic cylinders are arranged in the mounting holes, flange plates are arranged at the upper ends of the hydraulic cylinders, connecting holes are arranged in the flanges corresponding to the embedded nuts, the flange plates are adapted in the annular steps, and the connecting holes are aligned with the embedded nuts one by one and are screwed with bolts.
6. The precast box girder formwork for preventing the core formwork from floating up as claimed in claim 5, wherein:
the upper side of the connecting hole is provided with a countersunk hole, the end of the bolt sinks into the countersunk hole, and the upper end of the countersunk hole is provided with a sealing plug.
7. The precast box girder formwork for preventing the core formwork from floating up as claimed in claim 1, wherein:
the upper end of the hydraulic cylinder is provided with an annular bulge surrounding the output shaft of the hydraulic cylinder, the lower side of the pressure plate is provided with an annular groove surrounding the output shaft of the hydraulic cylinder, the lower end of the sleeve is sleeved outside the annular bulge, and the upper end of the sleeve is inserted into the annular groove.
8. A box girder casting method for preventing a core mold from floating up is characterized in that the box girder casting method adopts the box girder prefabricated template for preventing the core mold from floating up as claimed in claim 3, and specifically comprises the following steps:
step S1, mounting an outer die, a core die and reinforcing steel bars;
s2, locking the upper end of an output shaft of the hydraulic cylinder with a pressing plate, and tightly pulling the pressing plate downwards through the output shaft of the hydraulic cylinder so that the two sides of the longitudinal beam outwards push side plates on the two sides of the longitudinal beam through supporting rods;
s3, respectively pouring concrete between the outer mold and the core mold on two sides to finish the pouring of the box girder bottom plate;
s4, after the bottom plate of the box girder is poured, controlling each hydraulic cylinder to pull the pressing plate downwards until the pressing plate is tightly pressed and covers the opening of the bottom plate of the core mould;
s5, continuously completing concrete pouring of the web plate and the top plate of the box girder;
and S6, after the concrete reaches the designed strength, removing the outer mold and the core mold, when removing the core mold, firstly controlling the output shafts of the hydraulic cylinders to move upwards, controlling the pressing plates to move upwards under the action of the tension springs and abut against the limiting parts on the lower sides of the longitudinal beams, then removing the locking parts at the upper ends of the output shafts of the hydraulic cylinders, then controlling the output shafts of the hydraulic cylinders to jack upwards, enabling the longitudinal beams to pull the side plates on the two sides of the core mold to rotate inwards through the supporting rods on the two sides of the longitudinal beams, further enabling the side plates on the two sides of the core mold to be loosened with the surfaces of the box girders, then controlling the output shafts of the hydraulic cylinders to retract, and finally pulling out the whole core mold in the box girders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN110466042A (en) * | 2019-09-19 | 2019-11-19 | 山东高速城投绕城高速公路有限公司 | A kind of fixed device of prefabricated box girder inner formwork and fixed setting method |
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| CN115284415B (en) | 2023-08-22 |
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