CN115070908A - Method and device for fixing and disassembling prefabricated box girder integrally - Google Patents
Method and device for fixing and disassembling prefabricated box girder integrally Download PDFInfo
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- CN115070908A CN115070908A CN202210615195.5A CN202210615195A CN115070908A CN 115070908 A CN115070908 A CN 115070908A CN 202210615195 A CN202210615195 A CN 202210615195A CN 115070908 A CN115070908 A CN 115070908A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 238000009415 formwork Methods 0.000 claims abstract description 38
- 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 16
- 239000004567 concrete Substances 0.000 claims abstract description 13
- 230000002787 reinforcement Effects 0.000 claims abstract description 10
- 239000004568 cement Substances 0.000 claims abstract description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 29
- 230000008602 contraction Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 238000000926 separation method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
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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
- B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
-
- 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
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- 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
- B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
The invention relates to the technical field of box girder manufacturing, and particularly discloses a method and a device for fixing and disassembling a prefabricated box girder, which comprises the following steps: step 1, installing outer templates at two ends of a pedestal, and then installing a reinforcement cage on the pedestal; step 2, hoisting the inner formwork above the reinforcement cage, then installing side formworks at two end parts of the pedestal, and connecting the side formworks with the outer formwork and the inner formwork; step 3, injecting cement into a mold cavity formed by the outer template, the inner template and the side templates, after the concrete in the mold cavity is solidified into the box girder, sequentially removing the side templates and the outer template, and then shrinking the inner template to separate the inner template from the box girder; step 4, drawing the inner template out of the box girder through a rope collecting machine; and 5, after the inner template is drawn out of the box girder, unfolding the inner template. The invention not only reduces the labor intensity of constructors when the box girder is manufactured, but also improves the manufacturing efficiency of the box girder.
Description
Technical Field
The invention relates to the technical field of box girder manufacturing, in particular to a method and a device for fixing and disassembling a prefabricated box girder.
Background
The box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-place box girder. The box girder combined bridge girder erection machine prefabricated in the independent site can be erected after the lower project is completed, the project progress can be accelerated, and the construction period can be saved. The manufacturing process of the existing precast box girder mainly comprises the following steps: installing an external template on a pedestal of the prefabricated ground, and then manufacturing a reinforcement cage on the pedestal; placing the inner formwork at the upper end of the reinforcement cage, arranging side formworks at two ends of the pedestal to connect the outer formwork and the inner formwork, then pouring concrete, after the box girder is solidified, because the length of the inner template is generally more than 20 meters, the inner template is generally divided into a plurality of sections, each section of the inner template comprises a plurality of die sheets connected by bolts, when the inner formwork is dismantled, constructors need to enter the inner formwork to sequentially dismantle the formworks into the die sheets, then the die sheets are separated from the concrete box girder by knocking the die sheets, after the die sheets are separated from the box girder, the constructor takes the template out of the box girder, and after the template is taken out of the box girder, the template needs to be assembled into an inner template and is ready for next use, the inner formworks are required to be disassembled and reassembled in the box girder manufacturing process, so that great inconvenience is caused when the box girder is manufactured.
Disclosure of Invention
In order to solve the technical problems, the invention is solved by the following technical scheme:
a method for fixing and disassembling integrated precast box girders comprises the following steps:
step 1, installing outer templates at two ends of a pedestal, and then installing a reinforcement cage on the pedestal;
step 2, hoisting the inner formwork above the reinforcement cage, then installing side formworks at two end parts of the pedestal, and connecting the side formworks with the outer formwork and the inner formwork;
step 3, injecting cement into a mold cavity formed by the outer template, the inner template and the side templates, after the concrete in the mold cavity is solidified into the box girder, sequentially removing the side templates and the outer template, and then shrinking the inner template to separate the inner template from the box girder;
step 4, connecting a cable on the rope collecting machine with one end of the inner template, and then drawing the inner template out of the box girder through the rope collecting machine;
and 5, after the inner template is drawn out of the box girder, unfolding the inner template.
According to the invention, in the process of manufacturing the box girder, the inner template can be integrally pulled out of the box girder, so that a constructor does not need to enter the inner template to remove the inner template, thereby not only reducing the labor intensity of the constructor during manufacturing the box girder, but also improving the manufacturing efficiency of the box girder.
The invention also provides an inner template device which can realize the contraction of the inner template in the step 3 and the expansion of the inner template in the step 5 and comprises at least two connected supporting pieces, wherein each supporting piece comprises two side templates, a connecting plate for connecting the two side templates is arranged between the two side templates, the upper end part and the lower end part of each side template are respectively hinged with an upper corner die and a lower corner die, the side templates are provided with a first hydraulic cylinder and a second hydraulic cylinder which are used for respectively driving the upper corner die and the lower corner die to rotate, the upper end surface of each connecting plate is provided with a third hydraulic cylinder with an upward piston rod, and the piston rod of the third hydraulic cylinder is provided with a top template; a fourth hydraulic oil cylinder with a piston rod arranged downwards is further arranged on the lower end face of the connecting plate, and a bottom die piece is arranged on the piston rod of the fourth hydraulic oil cylinder.
According to the invention, the inner template can be conveniently contracted and expanded through the arrangement of the structure of the inner template device.
Preferably, the connecting plate is also provided with two groups of fifth hydraulic oil cylinders which are oppositely arranged along the width direction of the connecting plate, piston rods of the fifth hydraulic oil cylinders penetrate through the connecting plate and are arranged downwards, the piston rods of each group of fifth hydraulic oil cylinders are jointly connected with a roller mounting plate, and the lower end part of the roller mounting plate is provided with a rotatable roller; the roller can move to the lower end part of the bottom die sheet when the lower angle die rotates to be close to the side die sheet.
According to the invention, through the arrangement of the fifth hydraulic oil cylinder and the rollers, when the inner template device is dragged out of the box girder, the inner template device is supported through the rollers, so that the friction between the inner template device and the box girder can be reduced better.
Preferably, the bottom die is provided with strip-shaped grooves at the lower end faces of the adjacent ends of the two lower angle dies adjacent to the bottom die, and the strip-shaped grooves on the bottom die and the strip-shaped grooves on the lower angle dies can form a support strip forming groove.
According to the invention, the support bars are used for forming the grooves, so that the concrete can be prevented from passing through the gap between the lower corner die and the bottom die plate, and the primary separation effect of the bottom die plate and the box girder when the bottom die plate extrudes the inner wall of the box girder is further improved; and can guide the rollers so as to prevent the inner formwork assembly from being displaced while moving in the box girder.
Preferably, the upper end and the lower end of the side die sheet are provided with hinges, and the hinges at the upper end and the lower end of the side die sheet are respectively used for connecting the side die sheet with the adjacent upper corner die and the adjacent lower corner die.
According to the invention, the hinge is arranged, so that the side die plate can be hinged with the adjacent upper corner die and lower corner die.
Preferably, the end of the connecting plate near the side die sheet is expanded outwards to form an expansion part, and the expansion part is connected with the side die sheet through bolts.
According to the invention, through the arrangement of the expansion part, the side die can be mounted through the bolt connection between the expansion part and the side die, so that the side die can be mounted more conveniently.
Preferably, bolt mounting holes are formed in the two end portions of the side die pieces, the upper corner die, the lower corner die, the top die piece and the bottom die piece in the length direction of the side die pieces, the upper corner die, the lower corner die, the top die piece and the bottom die piece, and the two adjacent supporting pieces are connected through bolts penetrating through the bolt mounting holes.
In the invention, through the arrangement of the bolt mounting holes, not only can two adjacent supporting pieces be connected through bolts and the like, but also the side formworks can be mounted on the inner formwork device through the bolts and the like penetrating through the bolt mounting holes.
Drawings
Fig. 1 is a schematic view showing the use of the inner mold plate apparatus in example 1.
Fig. 2 is a schematic structural view of the inner mold plate in fig. 1.
Fig. 3 is a schematic structural view of the support member in embodiment 1.
Fig. 4 is a front view of the inner mold plate in the expanded state in example 1.
Fig. 5 is a front view of the inner mold plate in the contracted state in example 1.
Fig. 6 is an enlarged view of a portion a in fig. 4.
Fig. 7 is a partial structural schematic view of a finished box girder in embodiment 1.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not restrictive.
Example 1
As shown in fig. 1 to 7, the present embodiment provides a method for fixing and detaching integrated prefabricated box girders, which comprises the following steps:
step 1, installing outer formworks 120 at two ends of a pedestal 110, and then installing a reinforcement cage on the pedestal 110;
step 2, hoisting the inner formwork 130 above the reinforcement cage, then installing the side formworks 140 at two end parts of the pedestal 110, and connecting the side formworks 140 with the outer formwork 120 and the inner formwork 130;
step 3, injecting cement into a mold cavity formed by the outer template 120, the inner template 130 and the side templates 140, after the concrete in the mold cavity is solidified into a box girder, sequentially removing the side templates 140 and the outer template 120, and then shrinking the inner template 130 to separate the inner template 130 from the box girder;
step 4, connecting a cable on the rope collecting machine with one end of the inner template 130, and then drawing out the inner template 130 from the box girder through the rope collecting machine;
and 5, after the inner template 130 is pulled out of the box girder, unfolding the inner template 130.
In this embodiment, in order to achieve the connection between the connection plate 320 and the sideforms 310, the end of the connection plate 320 close to the sideforms 310 is expanded outwards to form an expansion portion 490, and the expansion portion 490 is connected to the sideforms 310 by bolts. The upper and lower ends of the side mold piece 310 are respectively hinged with an upper corner mold 330 and a lower corner mold 340, the upper and lower ends of the side mold piece 310 are respectively provided with hinges 480, and the hinges 480 at the upper and lower ends of the side mold piece 310 are respectively used for connecting the side mold piece 310 with the adjacent upper corner mold 330 and lower corner mold 340.
A first hydraulic oil cylinder 410 and a second hydraulic oil cylinder 420 which are used for respectively driving the upper angle die 330 and the lower angle die 340 to rotate are arranged on the side mold plate 310, a third hydraulic oil cylinder 430 with an upward piston rod is arranged on the upper end face of the connecting plate 320, and a top mold plate 350 is arranged on the piston rod of the third hydraulic oil cylinder 430; a fourth hydraulic cylinder 440 with a downward piston rod is further arranged on the lower end face of the connecting plate 320, and a bottom die 360 is arranged on the piston rod of the fourth hydraulic cylinder 440. In this embodiment, in order to realize the connection between two adjacent supporting members 210, bolt mounting holes 4100 are respectively formed at two end portions of the side mold piece 310, the upper mold 330, the lower mold 340, the top mold piece 350, and the bottom mold piece 360 along the length direction thereof, and the two adjacent supporting members 210 are connected by bolts passing through the bolt mounting holes 4100.
The bottom die 360 and the two adjacent lower corner dies 340 are provided with a strip-shaped groove 510 at the lower end face of the adjacent end, and the strip-shaped groove 510 on the bottom die 360 and the strip-shaped groove 510 on the lower corner dies 340 can form a support strip forming groove 520. The connecting plate 320 is also provided with two groups of fifth hydraulic cylinders 450 which are oppositely arranged along the width direction of the connecting plate 320, piston rods of the fifth hydraulic cylinders 450 penetrate through the connecting plate 320 and are arranged downwards, the piston rods of each group of the fifth hydraulic cylinders 450 are jointly connected with a roller mounting plate 460, and the lower end parts of the roller mounting plates 460 are provided with rotatable rollers 470; the roller 470 can move to the lower end of the bottom die 360 when the lower corner die 340 rotates to be adjacent to the side die 310.
When the box girder is used, after the box girder is formed, a constructor contracts the inner formworks 130, and the contraction steps of the inner formworks 130 are as follows: firstly, the third hydraulic oil cylinder 430 is driven to enable the top die 350 to move downwards, so that the top die 350 is separated from the box girder, the first hydraulic oil cylinder 410 is driven to enable the upper corner die 330 to rotate towards the center of the inner template 130, then the fourth hydraulic oil cylinder 440 is driven to enable a piston rod of the fourth hydraulic oil cylinder 440 to move downwards so that the bottom die 360 abuts against the inner wall of the box girder, so that the side die 310 moves upwards and is separated from the box girder, when the bottom die 360 presses the concrete box girder, due to the difference of the deformation coefficients of the bottom die 360 and the concrete box girder, under the same pressure, the deformation degrees of the bottom die 360 and the box girder are different, so that a small gap is generated between the bottom die 360 and the box girder, so that the primary separation of the bottom die 360 and the inner wall of the box girder is realized, after the side die 310 is lifted upwards, the second hydraulic oil cylinder 420 is driven to enable the lower corner die 340 to rotate to be close to the end of the side die 310, and then the fourth hydraulic oil cylinder 440 is driven to enable the piston rod of the fourth hydraulic oil cylinder 440 to move upwards, so that the bottom die plate 360 is completely separated from the box girder, after the bottom die plate 360 moves to the end of the connecting plate 320, the fifth hydraulic oil cylinder 450 is driven to enable the piston rod of the fifth hydraulic oil cylinder 450 to move vertically downwards until the roller 470 jacks up the whole inner die plate 130, and then the whole inner die plate 130 can be pulled by a rope retracting machine and other tools to pull the inner die plate 130 out of the box girder.
When the inner template 130 is unfolded, firstly, the fifth hydraulic cylinder 450 is driven to retract the roller 470 to the end of the connecting plate 320, and then the second hydraulic cylinder 420 is driven to rotate the lower angle template 340 to the edge to abut against the edge of the side template 310; then, the fourth hydraulic oil cylinder 440 is driven to move the bottom mould sheet 360 to the end of the side mould sheet 310 until the lower end surface of the bottom mould sheet 360 is flush with the lower end surface of the lower angle mould 340; the first hydraulic ram 410 will then be actuated to rotate the edge of the top die 330 against the edge of the side die plate 310 and finally the third hydraulic ram 430 will be actuated to move the top die plate 350 upwardly until the top face of the top die plate 350 is flush with the top face of the top die 330.
Through the method for fixing and disassembling the prefabricated box girder in the embodiment, the inner formwork 130 can be integrally pulled out of the box girder in the box girder manufacturing process, so that a constructor does not need to enter the inner formwork 130 to disassemble the inner formwork 130, and meanwhile, the constructor does not need to assemble the inner formwork 130 again, thereby not only reducing the labor intensity of the constructor during manufacturing the box girder, but also improving the manufacturing efficiency of the box girder.
In this embodiment, by setting the inner form device structure, the inner form 130 can be contracted and expanded by driving the first hydraulic cylinder 410, the second hydraulic cylinder 420, the third hydraulic cylinder 430 and the fourth hydraulic cylinder 440, so that the inner form 130 can be contracted and expanded more conveniently.
In addition, the side mold piece 310 can be easily mounted by providing the expansion part 490 and by bolt-connecting the expansion part 490 to the side mold piece 310.
The hinge 480 is arranged, so that the side mold piece 310 can be conveniently hinged with the adjacent upper corner mold 330 and lower corner mold 340.
In this case, by providing the bolt mounting holes 4100, not only the two adjacent supporting members 210 can be connected by bolts or the like, but also the side mold plates 140 can be mounted on the inner mold plate device by bolts or the like passing through the bolt mounting holes 4100, so that the side mold plates 140 can be conveniently mounted.
When concrete is poured, the pressure of the concrete at the bottom of the membrane cavity is high, rubber strips with the thickness value being half of the depth value of the support strip forming grooves 520 can be placed in the support strip forming grooves 520 through the arrangement of the support strip forming grooves 520, and when concrete is poured, the rubber strips can better block gaps between the lower corner molds 340 and the bottom mold pieces 360, so that the concrete is prevented from passing through the gaps between the lower corner molds 340 and the bottom mold pieces 360, and the stability during construction is improved better; meanwhile, the supporting bars are used for forming the grooves 520, so that when the bottom die piece 360 extrudes the inner wall of the box girder, the two ends of the bottom die piece 360 are extruded on the rubber strips, pressure on the bottom die piece 360 can be concentrated at the center of the bottom die piece 360, and the edges of the two ends of the bottom die piece 360 are easily deformed, so that the primary separation effect of the bottom die piece 360 and the box girder is further improved when the bottom die piece 360 extrudes the inner wall of the box girder; and through the setting of support bar grooving 520, can pour the back at the case roof beam and finish, can form bar guide table 710 on the inner wall of case roof beam for constructor when dragging this interior template device, two bar guide table 710 are located between two gyro wheels 470 and lead to gyro wheel 470, thereby have avoided this interior template device to take place the skew when removing in the case roof beam, thereby make this interior template device can be by stable pulling out the case roof beam.
Wherein, through the setting of fifth hydraulic cylinder 450 and gyro wheel 470, when can drag this interior template device out the case roof beam, support this interior template device through gyro wheel 470 to the reduction that can be preferred is the friction between this interior template device and the case roof beam, thereby the promotion of preferred drags the stability when this interior template device.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.
Claims (7)
1. A method for fixing and disassembling integrated precast box girders comprises the following steps:
step 1, installing outer templates (120) at two ends of a pedestal (110), and then installing a reinforcement cage on the pedestal (110);
step 2, hoisting the inner formwork (130) above the reinforcement cage, then installing side formworks (140) at two end parts of the pedestal (110), and connecting the side formworks (140) with the outer formwork (120) and the inner formwork (130);
step 3, injecting cement into a die cavity formed by the outer die plate (120), the inner die plate (130) and the side die plates (140), after the concrete in the die cavity is solidified into the box girder, sequentially removing the side die plates (140) and the outer die plate (120), and then shrinking the inner die plate (130) to separate the inner die plate (130) from the box girder;
step 4, connecting a cable on the rope collecting machine with one end of the inner template (130), and then drawing out the inner template (130) from the box girder through the rope collecting machine;
and 5, after the inner template (130) is drawn out of the box girder, unfolding the inner template (130).
2. An inner template assembly capable of achieving the contraction of the inner template (130) in step 3 and the expansion of the inner template (130) in step 5 of claim 1, characterized in that: the support comprises at least two support pieces (210) which are connected, each support piece (210) comprises two side dies (310), a connecting plate (320) used for connecting the two side dies (310) is arranged between the two side dies (310), the upper end part and the lower end part of each side die (310) are respectively hinged with an upper angle die (330) and a lower angle die (340), the side dies (310) are provided with a first hydraulic oil cylinder (410) and a second hydraulic oil cylinder (420) which are used for respectively driving the upper angle die (330) and the lower angle die (340) to rotate, the upper end surface of each connecting plate (320) is provided with a third hydraulic oil cylinder (430) with an upward piston rod, and the piston rod of each third hydraulic oil cylinder (430) is provided with a top die (350); a fourth hydraulic oil cylinder (440) with a downward piston rod is further arranged on the lower end face of the connecting plate (320), and a bottom die plate (360) is arranged on the piston rod of the fourth hydraulic oil cylinder (440).
3. An internal template assembly according to claim 2, wherein: the connecting plate (320) is also provided with two groups of fifth hydraulic oil cylinders (450) which are oppositely arranged along the width direction of the connecting plate (320), piston rods of the fifth hydraulic oil cylinders (450) penetrate through the connecting plate (320) to be arranged downwards, the piston rods of each group of fifth hydraulic oil cylinders (450) are jointly connected with a roller mounting plate (460), and the lower end parts of the roller mounting plates (460) are provided with rotatable rollers (470); the roller (470) can move to the lower end of the bottom die piece (360) when the bottom angle die (340) rotates to be close to the side die piece (310).
4. An internal template assembly according to claim 2, wherein: the lower end faces of the adjacent ends of the two lower corner molds (340) adjacent to the bottom mold piece (360) are respectively provided with a strip-shaped groove (510), and the strip-shaped grooves (510) on the bottom mold piece (360) and the strip-shaped grooves (510) on the lower corner molds (340) can form a support bar forming groove (520).
5. An internal template assembly according to claim 2, wherein: hinges (480) are arranged at the upper end and the lower end of the side mold sheet (310), and the hinges (480) at the upper end and the lower end of the side mold sheet (310) are respectively used for connecting the side mold sheet (310) with an upper corner mold (330) and a lower corner mold (340) which are adjacent to the side mold sheet.
6. An internal template assembly according to claim 2, wherein: the end part of the connecting plate (320) close to the side die piece (310) is expanded outwards to form an expansion part (490), and the expansion part (490) is connected with the side die piece (310) through bolts.
7. An internal template assembly according to claim 2, wherein: bolt mounting holes (4100) are formed in two end portions of the side die piece (310), the upper corner die (330), the lower corner die (340), the top die piece (350) and the bottom die piece (360) along the length direction of the side die piece, the upper corner die (330), the lower corner die (340), the top die piece (350) and the bottom die piece (360), and two adjacent supporting pieces (210) are connected through bolts penetrating through the bolt mounting holes (4100).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210615195.5A CN115070908A (en) | 2022-06-01 | 2022-06-01 | Method and device for fixing and disassembling prefabricated box girder integrally |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210615195.5A CN115070908A (en) | 2022-06-01 | 2022-06-01 | Method and device for fixing and disassembling prefabricated box girder integrally |
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| CN102189595A (en) * | 2011-04-14 | 2011-09-21 | 湖南中铁五新钢模有限责任公司 | Guide pillar type hydraulic internal mold for straight web plate box girder |
| CN204997807U (en) * | 2015-09-25 | 2016-01-27 | 佛山路桥预制构件有限公司 | Prefabricated little case roof beam centre form device |
| CN105365042A (en) * | 2015-09-25 | 2016-03-02 | 佛山路桥预制构件有限公司 | Manufacturing method of small prefabricated box girder |
| CN107363988A (en) * | 2017-09-07 | 2017-11-21 | 中交二公局第四工程有限公司 | The hydraulic internal mold rack rails running gear and traveling method of prefabricated case beam |
| CN109366700A (en) * | 2018-12-03 | 2019-02-22 | 中交二公局第工程有限公司 | Dismount the trolley and its assembly and disassembly methods of prefabricated case beam overall shrinkage formula hydraulic internal mold |
| CN211682708U (en) * | 2019-12-11 | 2020-10-16 | 山东铁鹰建设工程有限公司 | Full-hydraulic self-propelled highway box girder template |
| CN111421656A (en) * | 2020-05-26 | 2020-07-17 | 中交一公局厦门工程有限公司 | Integrally-drawing type small box girder hydraulic internal mold and mold retracting method |
| CN213005824U (en) * | 2020-07-20 | 2021-04-20 | 中铁大桥局第九工程有限公司 | Automatic change box girder template of control |
| CN215358998U (en) * | 2021-06-30 | 2021-12-31 | 洛阳瑞昊装配式建材有限公司 | Internal mold for casting precast concrete box girder |
| CN114986666A (en) * | 2022-06-01 | 2022-09-02 | 中交第四公路工程局有限公司 | Box girder manufacturing system based on tenon-and-mortise structure combined prefabricated pedestal |
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