CN115284415B - Box girder prefabricated formwork for preventing core mould from floating upwards and pouring method - Google Patents
Box girder prefabricated formwork for preventing core mould from floating upwards and pouring method Download PDFInfo
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- CN115284415B CN115284415B CN202210917963.2A CN202210917963A CN115284415B CN 115284415 B CN115284415 B CN 115284415B CN 202210917963 A CN202210917963 A CN 202210917963A CN 115284415 B CN115284415 B CN 115284415B
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- box girder
- longitudinal beam
- pressing plate
- pedestal
- plate
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000009415 formwork Methods 0.000 title claims abstract description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000005266 casting Methods 0.000 claims abstract description 5
- 230000009471 action Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 230000008569 process Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 238000009417 prefabrication Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
The application discloses a box girder prefabricated formwork for preventing a mandrel from floating up and a pouring method, comprising a pedestal, outer dies arranged on two sides of the pedestal and a mandrel arranged above the pedestal and between the outer dies on two sides of the pedestal, wherein a bottom plate of the mandrel is provided with an opening along the length direction; the hydraulic device also comprises a pressing plate assembly, wherein the pressing plate assembly comprises a longitudinal beam, a pressing plate and a hydraulic cylinder; the longitudinal beam is supported right above the opening through the support piece, the clamp plate is suspended below the longitudinal beam through the extension spring, a plurality of pneumatic cylinders are embedded and installed on the pedestal right below the opening at intervals, the upper end of the output shaft of the pneumatic cylinder penetrates through the clamp plate and is locked on the upper side of the clamp plate through the locking piece, and a sleeve extending from the top surface of the pedestal to the opening of the mandrel bottom plate is sleeved outside the output shaft of the pneumatic cylinder. The application combines the structure for preventing the core mould from floating and exhausting the concrete casting of the bottom plate, has simpler structure and improves the continuity of the concrete casting of the bottom plate and the web plate of the box girder.
Description
Technical Field
The application relates to the technical field of box girder prefabrication, in particular to a box girder prefabrication template for preventing a mandrel from floating upwards and a pouring method.
Background
The prefabricated prestressed box girder has the advantages of good integral rigidity, strong transverse stability and technical economy rationality, and is widely applied to highway bridges. The concrete before initial setting after stirring is a mixed material between liquid and solid, and the interaction between various mixed materials is very small when the mixed material is static, but in the box girder construction process, the impact force generated by pouring the concrete and the vibration force generated by vibrating the concrete for discharging air bubbles can lead the concrete to flow downwards under the action of force to become fluid. Thereby generating a counter force against the object restricting 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 box girder concrete is poured, the bottom plate thickness and the top plate of the box girder are thin due to the fact that the core die floats upwards, so that the quality of the box girder is affected.
At present, the common measures for controlling the floating of the mandrel in the market are as follows: (1) A cross beam is arranged above the core mold and connected with the outer vertical belt, and the cross beam is used as a top plate for supporting the adjustable screw rod to downwards prop against the core mold; (2) the bottom plate of the core mold is pulled up to the pedestal by a pull rod.
In the process of pouring box girder bottom plate concrete, the problem of floating of a mandrel is not needed to be considered, but air is discharged when concrete is poured, in order to facilitate the air discharge when concrete is poured, the prior art generally adopts to set an exhaust port on the bottom plate of the box girder inner die, after the bottom plate is poured, the exhaust port is manually closed, and then pouring of box girder web plate and top plate concrete is carried out.
Therefore, in the prior art, a structure for preventing the mandrel from floating and an exhaust structure for bottom plate concrete pouring are required to be independently arranged, so that the structure is complex, and after the bottom plate pouring is completed, an exhaust port is also required to be plugged manually, and the continuity of box girder bottom plate and web concrete pouring is affected.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides the box girder prefabricated template for preventing the mandrel from floating up and the pouring method, so that the structure for preventing the mandrel from floating up and exhausting air in the concrete pouring of the bottom plate is combined, the structure is simpler, and the continuity of the concrete pouring of the bottom plate and the web plate of the box girder is improved.
In one aspect, the application provides a box girder prefabricated formwork for preventing a mandrel from floating, which comprises a pedestal, outer dies arranged on two sides of the pedestal, and a mandrel arranged above the pedestal and arranged between the outer dies on two sides of the pedestal;
the bottom plate of the core mold is provided with an opening along the length direction;
the hydraulic device comprises a hydraulic cylinder, a longitudinal beam, a pressing plate and a pressing plate assembly, wherein the hydraulic cylinder is arranged on the longitudinal beam;
the longitudinal beam is supported right above the opening through the support piece, the pressing plate is suspended below the longitudinal beam through the tension springs, the hydraulic cylinders are embedded and installed on the pedestal right below the opening at intervals, the upper end of the output shaft of each hydraulic cylinder penetrates through the pressing plate and is locked on the upper side of the pressing plate through the locking piece, the pressing plate can be pressed on the bottom plate of the core mold and plugged the opening on the bottom plate of the core mold under the driving of the hydraulic cylinders, and a sleeve extending from the top surface of the pedestal to the opening on the bottom plate of the core mold is sleeved outside the output shaft of each hydraulic cylinder.
Further, the supporting piece comprises 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 the supporting rods are respectively hinged to the inner wall of the core mold and the side part of the longitudinal beam;
two sides of the top plate of the core die are respectively hinged with side plates on each side.
Further, a plurality of limiting pieces used for propping against the pressing plate are arranged on the lower side of the longitudinal beam at intervals.
Further, the locking piece is a locking nut which is in threaded sleeve connection with the upper end of the output shaft of the hydraulic cylinder.
Further, mounting holes are formed in the pedestal corresponding to the hydraulic cylinders, annular steps are formed in 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, a flange plate is arranged at the upper ends of the hydraulic cylinders, connecting holes are formed in the flanges corresponding to the embedded nuts, the flange plate is adapted to the annular steps, and the connecting holes are aligned with the embedded nuts one by one and are screwed with bolts.
Further, a countersunk hole is formed in the upper side of the connecting hole, the end head of the bolt is sunk into the countersunk hole, and a sealing plug is arranged at the upper end of the countersunk hole.
Further, the upper end of the hydraulic cylinder is provided with an annular bulge surrounding the outside of an output shaft of the hydraulic cylinder, the lower side of the pressing plate is provided with an annular groove surrounding the outside of 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 application provides a box girder pouring method for preventing the 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 mold, a core mold and reinforcing steel bars;
step S2, locking the upper end of an output shaft of the hydraulic cylinder with a pressing plate, and tensioning the pressing plate downwards through the output shaft of the hydraulic cylinder, so that the two sides of the longitudinal beam outwards lean against the side plates at the two sides of the longitudinal beam through the support rods;
s3, pouring concrete between the outer dies and the core dies on two sides respectively to finish pouring of the bottom plate of the box girder;
s4, after the pouring of the bottom plate of the box girder is completed, controlling each hydraulic cylinder to pull the pressing plate downwards until the pressing plate is tightly pressed and covered at 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 design strength, removing the outer mold and the core mold, when removing the core mold, controlling the output shafts of the hydraulic cylinders to move upwards, enabling the pressing plate to move upwards under the action of the tension springs and abut against the limiting piece on the lower side of the longitudinal beam, removing the locking piece at the upper end of the output shaft of each hydraulic cylinder, controlling the output shafts of the hydraulic cylinders to push upwards, enabling the longitudinal beam to pull the side plates on the two sides of the core mold to rotate inwards through the support rods on the two sides of the longitudinal beam, further loosening the side plates on the two sides of the core mold and the surface of the box beam, controlling the output shafts of the hydraulic cylinders to retract, and finally integrally pulling out the core mold in the box beam.
The beneficial effects of the application are as follows:
when the concrete of case roof beam bottom plate is pour, the clamp plate hangs in the below of longeron through the extension spring, and the opening on the mandrel bottom plate is opened this moment, and accessible this opening exhaust air when pouring the bottom plate concrete, after the bottom plate is pour and is accomplished, can be rapidly through the downward pulling clamp plate of pneumatic cylinder for the clamp plate presses on the bottom plate of mandrel to seal the opening on the mandrel bottom plate, then can continue to carry out the pouring of case roof beam web concrete, pour the in-process of case roof beam web concrete, the mandrel can be taut on pedestal 100 through the pneumatic cylinder, thereby plays the effect that prevents the mandrel come-up. Therefore, the application combines the structure for preventing the core mold from floating up and exhausting the bottom plate concrete pouring, not only can meet the exhausting requirement in the box girder bottom plate concrete pouring process, but also can play a role in preventing the core mold from floating up in the box girder web plate concrete pouring process, has simpler structure, and can rapidly block the opening on the core mold bottom plate after the bottom plate is poured, thereby realizing the seamless connection of the box girder bottom plate and the web plate concrete pouring, and improving the continuity of the box girder bottom plate and the web plate concrete pouring.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of an embodiment of the present application;
FIG. 2 is an enlarged view of a portion of FIG. 1;
FIG. 3 is a schematic illustration of a casting of a base plate according to an embodiment of the present application;
FIG. 4 is a schematic illustration of an embodiment of the present application when casting a web and a roof;
FIG. 5 is a schematic view of the side plates on both sides of the core mold and the surface of the box girder in the embodiment of the present application when they are loose;
fig. 6 is a schematic view of the entire core mold in the box girder according to the embodiment of the present application.
In the drawings, a 100-pedestal; 110-mounting holes; 120-annular steps; 130-embedding nuts; 200-outer die; 300-mandrel; 310-opening; 400-platen assembly; 410-stringers; 411-limiting piece; 420-pressing plate; 421-annular groove; 430-a hydraulic cylinder; 431-flange plate; 432-connecting holes; 433-bolt; 434-countersink; 435-sealing plug; 436-annular projection; 440-a tension spring; 450-locking member; 460-sleeve; 470-supporting bar.
Detailed Description
Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
As shown in fig. 1 to 6, the embodiment of the present application provides a box girder prefabricated formwork for preventing a core mold from floating up, comprising a pedestal 100, outer molds 200 provided at both sides of the pedestal 100, a core mold 300 provided above the pedestal 100 and placed 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 length direction. The platen assembly 400 includes a girder 410, a platen 420 and hydraulic cylinders 430, the girder 410 is supported right above the opening 310 by a support member, the platen 420 is suspended below the girder 410 by a tension spring 440, a plurality of hydraulic cylinders 430 are embedded and installed on a pedestal 100 right below the opening 310 at intervals, the upper end of an output shaft of the hydraulic cylinders 430 passes through the platen 420 and is locked on the upper side of the platen 420 by locking members 450, the locking members 450 can be specifically locking nuts which are in threaded connection with the upper end of the output shaft of the hydraulic cylinders 430, the platen 420 can be pressed on the bottom plate of the core mold 300 under the driving of the hydraulic cylinders 430 and block the opening 310 on the bottom plate of the core mold 300, and a sleeve 460 extending from the top surface of the pedestal 100 to the opening 310 on the bottom plate of the core mold 300 is sleeved outside the output shaft of the hydraulic cylinders 430.
Referring to fig. 3, when concrete of the bottom plate of the box girder is poured, the pressing plate 420 is suspended below the longitudinal beam 410 through the tension spring 440, at this time, the opening 310 on the bottom plate of the mandrel 300 is opened, air can be discharged through the opening 310 when concrete of the bottom plate is poured, referring to fig. 4, after pouring of the bottom plate is completed, the pressing plate 420 can be rapidly pulled downwards through the hydraulic cylinder 430, so that the pressing plate 420 is pressed on the bottom plate of the mandrel 300, the opening 310 on the bottom plate of the mandrel 300 is closed, and then pouring of the box girder web concrete can be continuously performed, and in the process of pouring the box girder web concrete, the mandrel 300 can be tensioned on the pedestal 100 through the hydraulic cylinder 430, thereby playing a role of preventing the mandrel 300 from floating upwards. Therefore, the application combines the structure for preventing the core mold 300 from floating up and exhausting the bottom plate concrete pouring, not only can meet the exhausting requirement in the box girder bottom plate concrete pouring process, but also can play a role in preventing the core mold 300 from floating up in the box girder web concrete pouring process, has simpler structure, and can rapidly block the opening 310 on the bottom plate of the core mold 300 after the bottom plate pouring is completed, thereby realizing the seamless connection of the box girder bottom plate and the web plate pouring and improving the continuity of the box girder bottom plate and the web plate concrete pouring.
In a preferred embodiment, the support member includes a plurality of support rods 470 symmetrically disposed at both sides of the girder 410, the support rods 470 extend obliquely downward from the girder 410, and both ends of the support rods 470 are respectively hinged to the inner wall of the core mold 300 and the sides of the girder 410. Both sides of the top plate of the core mold 300 are hinged to the side plates of each side, respectively.
The core 300 of this embodiment adopts the structure that the side plates at both sides are hinged with the top plate respectively, when the bottom plate concrete of the box girder is poured, the side plates at both sides of the core 300 are not subjected to lateral pressure, therefore, the pressing plate 420 can be pulled downwards by the hydraulic cylinder 430, so that the pressing plate 420 applies a downward pulling force to the longitudinal beam 410 through the tension spring 440, the longitudinal beam 410 further supports the side plates at both sides of the core 300 outwards through the support rods 470 at both sides, when the web plate of the box girder is poured, the pressure ratio of the side plates at both sides of the core 300 extruded towards the middle is larger, at the moment, the pressing plate 420 is clamped in the opening 310 of the bottom plate of the core 300, thus, the side plates at both sides of the core 300 are effectively prevented from being extruded to rotate towards the middle, when the core 300 is removed, the locking piece 450 at the upper end of the output shaft of the hydraulic cylinder 430 is firstly detached, then the longitudinal beam 410 is pushed upwards by the output shaft of the hydraulic cylinder 430, the longitudinal beam 410 is pulled inwards by the support rods 470 at both sides of the longitudinal beam, the side plates at both sides of the core 300 are further loosened by the surfaces of the support rods 470, and then the output shafts of the hydraulic cylinders 430 are controlled (refer to fig. 6), and the whole box girder 300 can be pulled out easily.
Preferably, a plurality of limiting members 411 are arranged at intervals on the lower side of the longitudinal beam 410 and used for abutting against the pressing plate 420, when the hydraulic cylinder 430 does not apply downward traction force to the pressing plate 420, the pressing plate 420 abuts against the lower side of the limiting members 411 under the action of the tension spring 440, and in an initial state, the tension spring 440 can maintain larger elasticity, so that when the pressing plate 420 is tensioned downwards through the output shaft of the hydraulic cylinder 430, the pressing plate 420 can provide larger tension for the longitudinal beam 410 through the tension spring 440, and the support rods 470 on two sides of the longitudinal beam 410 can be ensured to tightly support the side plates on two sides of the longitudinal beam 410.
In a preferred embodiment, the mounting holes 110 are formed on the pedestal 100 corresponding to the hydraulic cylinders 430, the annular step 120 is formed at the upper end of the mounting hole 110, a plurality of embedded nuts 130 are embedded in the annular step 120 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 corresponding to the embedded nuts 130 are provided with connecting holes 432, the flanges 431 are adapted to the annular step 120, and the connecting holes 432 are aligned with the embedded nuts 130 one by one and are screwed with bolts 433. With the above structure, not only is it convenient to insert and mount the hydraulic cylinder 430 on the pedestal 100, but also it is convenient to detach, repair or replace the hydraulic cylinder 430.
Preferably, a countersunk hole 434 is formed at the upper side of the connection hole 432, the end of the bolt 433 is sunk into the countersunk hole 434, and a sealing plug 435 is formed at the upper end of the countersunk hole 434 to ensure the upper surface of the stand 100 to be flat, preventing cement mortar from penetrating.
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 the output shaft of the hydraulic cylinder 430, when the bottom plate of the box girder is poured, the lower end of the sleeve 460 is sleeved on the annular boss 436 to be fixed, the upper end of the sleeve 460 exceeds the top surface of the bottom plate of the box girder, so that cement can be prevented from entering the sleeve 460, and 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 at the lower side of the pressing plate 420, so that the lower surface of the pressing plate 420 and the top surface of the bottom plate of the box girder can be ensured to be at the same height.
The embodiment of the application provides a box girder pouring method for preventing a mandrel from floating, which adopts the box girder prefabricated template for preventing the mandrel from floating to pour the box girder, and specifically comprises the following steps:
step S1, mounting an outer mold 200, a core mold 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 tensioning 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 propped against the side plates at the two sides of the longitudinal beam 410 outwards through the support rods 470 (as shown in FIG. 1);
step S3, pouring concrete between the outer die 200 and the core die 300 on two sides respectively to finish pouring of a bottom plate of the box girder (shown in figure 3);
step S4, after the pouring of the bottom plate of the box girder is completed, controlling each hydraulic cylinder 430 to pull the pressing plate 420 downwards until the pressing plate 420 is pressed and covered at the opening 310 of the bottom plate of the mandrel 300;
s5, continuously completing concrete pouring of the web plate and the top plate of the box girder (as shown in fig. 4);
and S6, after the concrete reaches the design 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 upwards, the pressing plate 420 moves upwards under the action of the tension springs 440 and abuts against the limiting piece 411 at the lower side of the longitudinal beam 410, then the locking piece 450 at the upper end of the output shaft of each hydraulic cylinder 430 is removed, then the output shafts of the hydraulic cylinders 430 are controlled to push upwards, the longitudinal beam 410 pulls the side plates at the two sides of the core mold 300 to rotate inwards through the support rods 470 at the two sides of the longitudinal beam, further the side plates at the two sides of the core mold 300 are loosened with 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 for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the appended claims and description.
Claims (7)
1. The utility model provides a prevent precast box girder template of mandrel come-up, includes the pedestal, locates the external mold of pedestal both sides and locate the top of pedestal is located 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 hydraulic device comprises a hydraulic cylinder, a longitudinal beam, a pressing plate and a pressing plate assembly, wherein the hydraulic cylinder is arranged on the longitudinal beam;
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 hydraulic cylinders are embedded and installed on a pedestal right below the opening at intervals, the upper end of an output shaft of each hydraulic cylinder penetrates through the pressing plate and is locked on the upper side of the pressing plate through a locking piece, the pressing plate can be pressed on a bottom plate of the core mold and can seal the opening on the bottom plate of the core mold under the driving of the hydraulic cylinders, and a sleeve extending from the top surface of the pedestal to the opening on the bottom plate of the core mold is sleeved outside the output shaft of each hydraulic cylinder;
the support piece comprises a plurality of support rods symmetrically distributed on two sides of the longitudinal beam, the support rods extend obliquely downwards from the longitudinal beam, and two ends of the support rods are respectively hinged to the inner wall of the core mold and the side part of the longitudinal beam;
two sides of the top plate of the core die are respectively hinged with side plates on each side.
2. A box girder prefabricated form for preventing a core form floating up according to claim 1, wherein:
and a plurality of limiting pieces used for propping against the pressing plate are arranged on the lower side of the longitudinal beam at intervals.
3. A box girder prefabricated form for preventing a core form floating up according to claim 1, wherein:
the locking piece is a locking nut which is in threaded sleeve connection with the upper end of an output shaft of the hydraulic cylinder.
4. A box girder prefabricated form for preventing a core form floating up according to claim 1, wherein:
the mounting device comprises a pedestal, a plurality of hydraulic cylinders, a plurality of embedded nuts, a flange plate, connecting holes, a flange plate, a plurality of connecting holes, bolts and bolts, wherein the mounting holes are formed in the pedestal corresponding to the hydraulic cylinders, the annular steps are formed in the upper ends of the mounting holes, the embedded nuts are embedded in the annular steps at intervals along the circumferential direction, the hydraulic cylinders are arranged in the mounting holes, the flange plate is arranged at the upper ends of the hydraulic cylinders, the connecting holes are formed in the flange plate corresponding to the embedded nuts, the flange plate is adapted to the annular steps, and the connecting holes are aligned with the embedded nuts one by one and are screwed with the bolts.
5. A box girder prefabricated form for preventing a core form floating up according to claim 4, wherein:
the upper side of the connecting hole is provided with a countersunk hole, the end head of the bolt is sunk into the countersunk hole, and the upper end of the countersunk hole is provided with a sealing plug.
6. A box girder prefabricated form for preventing a core form floating up according to claim 1, wherein:
the upper end of the hydraulic cylinder is provided with an annular bulge surrounding the outside of an output shaft of the hydraulic cylinder, the lower side of the pressing plate is provided with an annular groove surrounding the outside of 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.
7. The box girder casting method for preventing the floating of the mandrel is characterized by adopting the box girder prefabricated formwork for preventing the floating of the mandrel as claimed in claim 2 to cast the box girder, and specifically comprises the following steps:
step S1, installing an outer mold, a core mold and reinforcing steel bars;
step S2, locking the upper end of an output shaft of the hydraulic cylinder with a pressing plate, and tensioning the pressing plate downwards through the output shaft of the hydraulic cylinder, so that the two sides of the longitudinal beam outwards lean against the side plates at the two sides of the longitudinal beam through the support rods;
s3, pouring concrete between the outer dies and the core dies on two sides respectively to finish pouring of the bottom plate of the box girder;
s4, after the pouring of the bottom plate of the box girder is completed, controlling each hydraulic cylinder to pull the pressing plate downwards until the pressing plate is tightly pressed and covered at 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 design strength, removing the outer mold and the core mold, when removing the core mold, controlling the output shafts of the hydraulic cylinders to move upwards, enabling the pressing plate to move upwards under the action of the tension springs and abut against the limiting piece on the lower side of the longitudinal beam, removing the locking piece at the upper end of the output shaft of each hydraulic cylinder, controlling the output shafts of the hydraulic cylinders to push upwards, enabling the longitudinal beam to pull the side plates on the two sides of the core mold to rotate inwards through the support rods on the two sides of the longitudinal beam, further loosening the side plates on the two sides of the core mold and the surface of the box beam, controlling the output shafts of the hydraulic cylinders to retract, and finally integrally pulling out the core mold in the box beam.
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| CN110466042B (en) * | 2019-09-19 | 2024-03-15 | 山东高速城投绕城高速公路有限公司 | A kind of prefabricated box beam internal mold fixing device and fixing installation method |
| CN118144077B (en) * | 2024-03-11 | 2024-11-19 | 中铁四局集团有限公司 | Quick-release type highway box girder hydraulic internal mold and working method thereof |
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