CN113650138B - Easy dismouting type contraction type cast concrete case roof beam centre form - Google Patents
Easy dismouting type contraction type cast concrete case roof beam centre form Download PDFInfo
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- CN113650138B CN113650138B CN202011180800.8A CN202011180800A CN113650138B CN 113650138 B CN113650138 B CN 113650138B CN 202011180800 A CN202011180800 A CN 202011180800A CN 113650138 B CN113650138 B CN 113650138B
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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
- B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
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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
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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
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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)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention discloses an easy-to-assemble and disassemble type shrinkage type cast concrete box girder internal mold, which comprises: an upper die and a lower die; the upper die comprises a first upper die and a second upper die, and the first upper die is provided with a first upper die top surface and a first upper die side surface; the second upper die is provided with a second upper die top surface and a second upper die side surface; the lower die comprises a first lower die and a second lower die, the first lower die is provided with a first lower die bottom surface and a first lower die side surface, and the upper end of the first lower die side surface is rotatably connected with the lower end of the first upper die side surface; the second lower die is provided with a second lower die bottom surface and a second lower die side surface, and the upper end of the second lower die side surface is rotatably connected with the lower end of the second upper die side surface; a jacking mechanism and a bendable supporting rod are arranged between the upper die and the lower die; the shrinkage demoulding of the upper die and the lower die is realized through the traction rope after the support rod is bent. The invention aims to solve the technical problem that an inner mold is difficult to disassemble and assemble in the pouring process of a concrete box girder.
Description
Technical Field
The invention relates to the technical field of building bridge construction, in particular to an easily-disassembled and assembled type shrinkage type cast concrete box girder internal mold.
Background
The box girder is one of bridge engineering center girders, is hollow inside, has flanges on two sides of the upper part, is similar to a box body structure, and is named. The box girder of the reinforced concrete structure is divided into a prefabricated box girder and a cast-in-place box girder, and the prefabricated box girder is a box girder prefabricated in an independent field and combined with a bridge girder erection machine, so that the construction can be completed after the lower part of the construction is completed, the construction progress can be accelerated, and the construction period can be saved; cast-in-place box girders are mostly used for large continuous bridges.
At present, when box girders are prefabricated domestically, the inner molds are mostly connected through blocked templates through bolts and are manually assembled before use, the used manual mold removal is realized, the assembling and disassembling bolts occupy longer time, the templates are heavy large structural members, the mold disassembling and assembling difficulty is large, the operation is complex, the labor intensity of the assembled and disassembled workers is high, and the construction efficiency is low. Therefore, this problem is urgently to be solved.
Disclosure of Invention
In view of this, the invention aims to provide an easily detachable retractable cast concrete box girder inner mold, so as to solve the technical problem that the inner mold is difficult to detach in the casting process of a concrete box girder.
In order to achieve the above objects, the present invention provides an easily detachable and retractable type cast concrete box girder inner mold, comprising: an upper die and a lower die;
the upper die comprises a first upper die and a second upper die which are oppositely arranged, and the first upper die is provided with a first upper die top surface and a first upper die side surface; the second upper die is provided with a second upper die top surface and a second upper die side surface;
the lower die comprises a first lower die and a second lower die which are oppositely arranged, the first lower die is provided with a first lower die bottom surface and a first lower die side surface, and the upper end of the first lower die side surface is rotationally connected with the lower end of the first upper die side surface around a horizontal shaft; the second lower die is provided with a second lower die bottom surface and a second lower die side surface, and the upper end of the second lower die side surface is rotationally connected with the lower end of the second upper die side surface around a horizontal shaft;
the first upper die top surface, the first upper die side surface, the first lower die bottom surface, the second lower die side surface, the second upper die side surface and the second upper die top surface are sequentially connected and enclosed to form an inner die surface;
a jacking mechanism and a first supporting rod are arranged between the first upper die and the first lower die, and correspondingly, the jacking mechanism and the second supporting rod are also arranged between the second upper die and the second lower die; the first supporting rod comprises a first upper supporting rod and a first lower supporting rod, the end parts of the first upper supporting rod and the first lower supporting rod are hinged, the other end of the first upper supporting rod is hinged with the first upper die, and the other end of the first lower supporting rod is hinged with the first lower die; the second support rod comprises a second upper support rod and a second lower support rod, the end parts of the second upper support rod and the second lower support rod are hinged, the other end of the second upper support rod is hinged with the second upper die, and the other end of the second lower support rod is hinged with the second lower die; a locking mechanism is further arranged between the first support rod and the second support rod;
a first upper supporting point is arranged on the first upper die, and correspondingly, a first lower supporting point is arranged on the first lower die; the first traction rope sequentially passes through the first upper supporting point and the first lower supporting point and is used for enabling the first upper die and the first lower die to contract when being stressed and tensioned;
a second upper supporting point is arranged on the second upper die, and correspondingly, a second lower supporting point is arranged on the second lower die; and the second traction rope sequentially passes through the second upper fulcrum and the second lower fulcrum and is used for enabling the second upper die and the second lower die to contract when being stressed and tensioned.
Further, the climbing mechanism includes: the rod and the rod sleeve are sleeved in a sliding mode so as to be sleeved with the periphery of the rod and the rod sleeve and enable the rod and the rod sleeve to be positioned in the propping-up spring.
Further, pulleys for passing through the first traction rope are arranged at the first upper fulcrum and the first lower fulcrum, and correspondingly, the pulleys are also arranged at the second upper fulcrum and the second lower fulcrum.
Furthermore, the first upper pivot and the first lower pivot are arranged in groups, and a plurality of groups are arranged along the length extension direction of the inner die, and the first traction rope sequentially passes through the first upper pivot and the first lower pivot along the continuous Z-shaped shape; the second upper supporting points and the second lower supporting points are arranged in groups, a plurality of groups are arranged along the extension direction of the length of the inner die, and the second traction ropes sequentially pass through the second upper supporting points and the second lower supporting points along the continuous Z-shaped shape.
Furthermore, rib plates are arranged on the inner walls of the first upper die, the second upper die, the first lower die and the second lower die.
Further, the locking mechanism includes: the locking plate is arranged on one of the first supporting rod and the second supporting rod in a rotating mode around a horizontal shaft, a hook is arranged on the locking plate, and a hanging rod matched with the hook is arranged on the other one of the first supporting rod and the second supporting rod correspondingly.
Furthermore, an arc-shaped flange is further arranged on the locking plate, and when the locking plate rotates, the arc-shaped flange supports a hinge point between the first supporting rod and the middle of the second supporting rod.
Furthermore, the locking plate of each first supporting rod is connected in series through the locking rod for transmission.
Compared with the prior art, the invention has the beneficial effects that: the technical problem that the inner die is difficult to disassemble and assemble in the pouring process of the concrete box girder is solved.
1. According to the invention, the template is of an integral retractable structure, and external power is adopted for demolding, so that the disassembling and assembling time is saved, the labor intensity of construction workers is reduced, the construction difficulty is greatly simplified, and the construction efficiency is improved;
2. the structure of the invention has large empty space, more flexible manual control, simple structure but more stable, and difficult deformation when in use;
3. the invention has less abutted seams after the single templates are spliced, and the forming effect is more beautiful after the concrete is poured.
Drawings
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Fig. 1 is a schematic front view of the present invention.
FIG. 2 isbase:Sub>A schematic sectional view taken along line A-A of FIG. 1 according to the present invention.
In the figure: 1. an upper die; 11. a first upper die; 111. a first upper die top surface; 112. a first upper die side; 12. a second upper die; 121. a second upper die top surface; 122. a second upper die side; 2. a lower die; 21. a first lower die; 211. a first lower die bottom surface; 212. a first lower die side; 22. a second lower die; 221. a second lower die bottom surface; 222. a second lower die side; 3. a jacking mechanism; 31. a rod; 32. a rod sleeve; 33. a jacking spring; 41. a first support bar; 411. a first upper support strut; 412. a first lower support bar; 42. a second support bar; 421. a second upper support strut; 422. a second lower support bar; 51. a first upper fulcrum; 52. a second upper fulcrum; 61. a first lower fulcrum; 62. a second lower fulcrum; 7. a rib plate; 8. a lock plate; 81. hooking; 82. a hanging rod; 83. an arc-shaped flange; 9. a locking lever.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention provides an easily assembled and disassembled collapsible cast concrete box girder inner mold, including: an upper die 1 and a lower die 2;
the upper die 1 comprises a first upper die 11 and a second upper die 12 which are oppositely arranged, and the first upper die 11 is provided with a first upper die top surface 111 and a first upper die side surface 112; the second upper die 12 is provided with a second upper die top surface 121 and a second upper die side surface 122;
the lower die 2 comprises a first lower die 21 and a second lower die 22 which are oppositely arranged, the first lower die 21 is provided with a first lower die bottom surface 211 and a first lower die side surface 212, and the upper end of the first lower die side surface 212 is rotationally connected with the lower end of the first upper die side surface 112 around a horizontal shaft; the second lower die 22 is provided with a second lower die bottom surface 221 and a second lower die side surface 222, and the upper end of the second lower die side surface 222 is rotatably connected with the lower end of the second upper die side surface 122 around a horizontal shaft;
the first upper die top surface 111, the first upper die side surface 112, the first lower die side surface 212, the first lower die bottom surface 211, the second lower die bottom surface 221, the second lower die side surface 222, the second upper die side surface 122 and the second upper die top surface 121 are connected in sequence to enclose an inner die surface, which is generally in an inverted trapezoid shape;
a jacking mechanism 3 and a first support rod 41 (which can be fastened and detached through bolts) are arranged between the first upper die 11 and the first lower die 21, and correspondingly, the jacking mechanism 3 and a second support rod 42 (which can be fastened and detached through bolts) are also arranged between the second upper die 12 and the second lower die 22; the first support rod 41 comprises a first upper support rod 411 and a first lower support rod 412, the ends of which are hinged, the other end of the first upper support rod 411 is hinged with the first upper die 11, and the other end of the first lower support rod 412 is hinged with the first lower die 21; the second support rod 42 comprises a second upper support rod 421 and a second lower support rod 422, the ends of which are hinged, the other end of the second upper support rod 421 is hinged with the second upper die 12, and the other end of the second lower support rod 422 is hinged with the second lower die 22; a locking mechanism is further arranged between the first support rod 41 and the second support rod 42; when the mould is supported, the locking mechanism is used for keeping the supporting rod in a vertical state, and when the mould is retracted, the locking mechanism is used for bending the supporting rod and rotating the supporting rod to a dead point position;
a first upper pivot 51 is arranged on the first upper die 11, and correspondingly, a first lower pivot 61 is arranged on the first lower die 21; the first hauling cable passes through the first upper supporting point 51 and the first lower supporting point 61 in sequence, and is used for enabling the first upper die 11 and the first lower die 21 to contract when being stressed and tensioned;
a second upper fulcrum 52 is arranged on the second upper die 12, and correspondingly, a second lower fulcrum 62 is arranged on the second lower die 22; the second pulling rope passes through the second upper fulcrum 52 and the second lower fulcrum 62 in sequence, and is tensioned by force to contract the second upper die 12 and the second lower die 22.
Specifically, when the mold is supported, the first upper mold 11 and the first lower mold 21 are at the maximum opening degree under the action of the jacking mechanism 3, and correspondingly, the second upper mold 12 and the second lower mold 22 are at the maximum opening degree under the action of the jacking mechanism 3, at this time, the first upper support bar 411 and the first lower support bar 412 are in the upright state, and the second upper support bar 421 and the second lower support bar 422 are also in the upright state, and are locked by the locking mechanism, so that the support bars are at the dead point positions, the support strength is high, the bending movement in the pouring process is prevented, the operation is easy, finally, the left and right connecting plates are installed and fixed (as shown by dotted lines in the drawing), and the whole inner mold is supported; when the form is disassembled, the locking mechanism is firstly loosened, the first supporting rod 41 and the second supporting rod 42 are bent respectively, the first traction rope and the second traction rope are pulled respectively through the winching machine, the first upper die and the second lower die are contracted, the second upper die and the second lower die are contracted, and finally the whole inner form is pulled out from the end part.
In this embodiment, preferably, the jacking mechanism 3 includes: the rod 31 and the rod sleeve 32 are slidably sleeved to sleeve the periphery of the two and make the two in the expanded jacking spring 33. In the figure, the upper end of the rod 31 is hinged with the upper die 1, and the lower end of the rod sleeve 32 is hinged with the lower die 2.
In this embodiment, pulleys for passing through the first pulling rope are preferably disposed at the first upper fulcrum 51 and the first lower fulcrum 61, and correspondingly, the pulleys are also disposed at the second upper fulcrum 52 and the second lower fulcrum 62. And the abrasion is reduced.
In this embodiment, preferably, the first upper fulcrums 51 and the first lower fulcrums 61 are arranged in groups, and a plurality of groups are arranged along the extension direction of the length of the inner mold, and the first traction rope sequentially passes through the first upper fulcrums 51 and the first lower fulcrums 61 along a continuous zigzag shape; the second upper fulcrums 52 and the second lower fulcrums 62 are arranged in groups, and a plurality of groups are arranged along the extension direction of the length of the inner die, and the second traction ropes sequentially pass through the second upper fulcrums 52 and the second lower fulcrums 62 along the continuous Z-shaped shape.
In this embodiment, it is preferable that rib plates 7 are disposed on inner walls of the first upper die 11, the second upper die 12, the first lower die 21, and the second lower die 22. The form is reinforced.
In this embodiment, preferably, the locking mechanism includes: the locking plate 8 is arranged on one of the first supporting rod 41 and the second supporting rod 42 in a rotating mode around a horizontal shaft, a hook 81 is arranged on the locking plate 8, and a hanging rod 82 matched with the hook 81 is arranged on the other one of the first supporting rod 41 and the second supporting rod 42 correspondingly. Further, an arc-shaped flange 83 is further disposed on the locking plate 8, and a backing plate is disposed on the other supporting rod, so that when the locking plate 8 rotates, the arc-shaped flange 83 supports a hinge point between the first supporting rod 41 and the second supporting rod 42. Still further, the locking plate 8 of each first supporting rod 41 is in serial transmission through the locking rod 9. As shown in the figure, when the locking rod 9 is rotated clockwise, the hook 81 is matched with the hanging rod 82, and corresponding locking is performed; when the locking rod 9 is rotated counterclockwise, the arc-shaped flange 83 supports the hinge point of the middle parts of the two support rods away from the dead point position.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
Claims (6)
1. The utility model provides an easy dismouting type contraction type cast concrete box girder centre form which characterized in that includes: an upper die (1) and a lower die (2);
the upper die (1) comprises a first upper die (11) and a second upper die (12) which are oppositely arranged, and a first upper die top surface (111) and a first upper die side surface (112) are arranged on the first upper die (11); the second upper die (12) is provided with a second upper die top surface (121) and a second upper die side surface (122);
the lower die (2) comprises a first lower die (21) and a second lower die (22) which are oppositely arranged, a first lower die bottom surface (211) and a first lower die side surface (212) are arranged on the first lower die (21), and the upper end of the first lower die side surface (212) is rotatably connected with the lower end of the first upper die side surface (112) around a horizontal shaft; the second lower die (22) is provided with a second lower die bottom surface (221) and a second lower die side surface (222), and the upper end of the second lower die side surface (222) is rotatably connected with the lower end of the second upper die side surface (122) around a horizontal shaft;
the first upper die top surface (111), the first upper die side surface (112), the first lower die side surface (212), the first lower die bottom surface (211), the second lower die bottom surface (221), the second lower die side surface (222), the second upper die side surface (122) and the second upper die top surface (121) are sequentially connected to form an inner die surface;
a jacking mechanism (3) and a first support rod (41) are arranged between the first upper die (11) and the first lower die (21), and correspondingly, the jacking mechanism (3) and a second support rod (42) are also arranged between the second upper die (12) and the second lower die (22); the first supporting rod (41) comprises a first upper supporting rod (411) and a first lower supporting rod (412) with hinged ends, the other end of the first upper supporting rod (411) is hinged with the first upper die (11), and the other end of the first lower supporting rod (412) is hinged with the first lower die (21); the second supporting rod (42) comprises a second upper supporting rod (421) and a second lower supporting rod (422) with hinged ends, the other end of the second upper supporting rod (421) is hinged with the second upper die (12), and the other end of the second lower supporting rod (422) is hinged with the second lower die (22); a locking mechanism is further arranged between the first support rod (41) and the second support rod (42);
a first upper supporting point (51) is arranged on the first upper die (11), and correspondingly, a first lower supporting point (61) is arranged on the first lower die (21); the first traction rope sequentially passes through the first upper fulcrum (51) and the first lower fulcrum (61), and is used for enabling the first upper die (11) and the first lower die (21) to contract when being stressed and tensioned;
a second upper supporting point (52) is arranged on the second upper die (12), and correspondingly, a second lower supporting point (62) is arranged on the second lower die (22); the second traction rope sequentially passes through a second upper fulcrum (52) and a second lower fulcrum (62), and is used for contracting the second upper die (12) and the second lower die (22) when being stressed and tensioned;
wherein the locking mechanism includes: a locking plate (8) which is arranged on one of the first supporting rod (41) and the second supporting rod (42) in a rotating mode around a horizontal shaft, a hook (81) is arranged on the locking plate (8), and a hanging rod (82) matched with the hook (81) is arranged on the other of the corresponding first supporting rod (41) and the corresponding second supporting rod (42);
when the locking plate (8) rotates, the arc-shaped flange (83) supports a hinge point between the first support rod (41) and the middle part of the second support rod (42).
2. The easy-to-assemble and disassemble type collapsible pouring concrete box girder inner mold according to claim 1, wherein the jacking mechanism (3) comprises: a rod (31) and a rod sleeve (32) which are sleeved in a sliding way so as to sleeve the peripheries of the two and make the two be in a jacking spring (33) which is expanded.
3. The easy-to-assemble and disassemble type collapsible poured concrete box girder inner mold according to claim 1, wherein pulleys for passing a first pulling rope are arranged at the first upper pivot (51) and the first lower pivot (61), and correspondingly, the pulleys are also arranged at the second upper pivot (52) and the second lower pivot (62).
4. The easy-to-assemble and disassemble type collapsible poured concrete box girder inner mold according to claim 1, wherein the first upper supporting point (51) and the first lower supporting point (61) are arranged in groups, and a plurality of groups are arranged along the length extension direction of the inner mold, and the first pulling rope sequentially passes through the first upper supporting point (51) and the first lower supporting point (61) along a continuous Z shape; the second upper fulcrums (52) and the second lower fulcrums (62) are arranged in groups, a plurality of groups of the second upper fulcrums and the second lower fulcrums are arranged along the length extension direction of the inner die, and the second traction ropes sequentially pass through the second upper fulcrums (52) and the second lower fulcrums (62) along the continuous Z-shaped shape.
5. The easy-to-assemble and disassemble type shrinkage pour concrete box girder inner mold according to claim 1, wherein rib plates (7) are arranged on the inner walls of the first upper mold (11), the second upper mold (12), the first lower mold (21) and the second lower mold (22).
6. The collapsible cast concrete box girder inner mold easy to assemble and disassemble according to claim 1, wherein the locking plate (8) of each of the first support rods (41) is serially driven by a locking rod (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011180800.8A CN113650138B (en) | 2020-10-29 | 2020-10-29 | Easy dismouting type contraction type cast concrete case roof beam centre form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011180800.8A CN113650138B (en) | 2020-10-29 | 2020-10-29 | Easy dismouting type contraction type cast concrete case roof beam centre form |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113650138A CN113650138A (en) | 2021-11-16 |
| CN113650138B true CN113650138B (en) | 2023-02-17 |
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| CN202011180800.8A Active CN113650138B (en) | 2020-10-29 | 2020-10-29 | Easy dismouting type contraction type cast concrete case roof beam centre form |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104085042A (en) * | 2014-07-16 | 2014-10-08 | 中建三局第一建设工程有限责任公司 | Construction method for automatic hydraulic assembly and disassembly of internal mold for prefabricating small box beams |
| CN207224257U (en) * | 2017-09-07 | 2018-04-13 | 中交二公局第四工程有限公司 | The hydraulic internal mold rack rails running gear of prefabricated case beam |
| CN107363988B (en) * | 2017-09-07 | 2023-06-27 | 中交二公局第四工程有限公司 | Hydraulic internal mold toothed rail traveling system and traveling method for prefabricated box girder |
| CN207594034U (en) * | 2017-10-23 | 2018-07-10 | 山东瑞鸿重工机械有限公司 | A kind of box girder inner formwork week rotation positioning device |
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